133,630 results
Search Results
2. Structure‐Foldable and Performance‐Tailorable PI Paper‐Based Triboelectric Nanogenerators Processed and Controlled by Laser‐Induced Graphene
- Author
-
Weixiong Yang, Mingguang Han, Fu Liu, Dan Wang, Yan Gao, Guantao Wang, Xilun Ding, and Sida Luo
- Subjects
energy harvesting ,laser‐induced graphene ,paper electronics ,tactile sensors ,triboelectric nanogenerators ,Science - Abstract
Abstract Laser‐induced graphene (LIG) technology has provided a new manufacturing strategy for the rapid and scalable assembling of triboelectric nanogenerators (TENG). However, current LIG‐based TENG commonly rely on polymer films, e.g., polyimide (PI) as both friction material and carbon precursor of electrodes, which limit the structural diversity and performance escalation due to its incapability of folding and creasing. Using specialized PI paper composed of randomly distributed PI fibers to substantially enhance its foldability, this work creates a new type of TENG, which are structurally foldable and stackable, and performance tailorable. First, by systematically investigating the laser power‐regulated performance of single‐unit TENG, the open‐circuit voltage can be effectively improved. By further exploiting the folding process, multiple TENG units can be assembled together to form multi‐layered structures to continuously expand the open‐circuit voltage from 5.3 to 34.4 V cm−2, as the increase of friction units from 1 to 16. Last, by fully utilizing the unique structure and performance, representative energy‐harvesting and smart‐sensing applications are demonstrated, including a smart shoe to recognize running motions and power LEDs, a smart leaf to power a thermometer by wind, a matrix sensor to recognize writing trajectories, as well as a smart glove to recognize different objects.
- Published
- 2024
- Full Text
- View/download PDF
3. High‐rate metal‐free MXene microsupercapacitors on paper substrates
- Author
-
Han Xue, Po‐Han Huang, Lee‐Lun Lai, Yingchun Su, Axel Strömberg, Gaolong Cao, Yuzhu Fan, Sergiy Khartsev, Mats Göthelid, Yan‐Ting Sun, Jonas Weissenrieder, Kristinn B. Gylfason, Frank Niklaus, and Jiantong Li
- Subjects
direct ink writing ,femtosecond laser scribing ,MXene ,on‐paper microsupercapacitors ,PEDOT:PSS ,ultrahigh rate capability ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract MXene is a promising energy storage material for miniaturized microbatteries and microsupercapacitors (MSCs). Despite its superior electrochemical performance, only a few studies have reported MXene‐based ultrahigh‐rate (>1000 mV s−1) on‐paper MSCs, mainly due to the reduced electrical conductance of MXene films deposited on paper. Herein, ultrahigh‐rate metal‐free on‐paper MSCs based on heterogeneous MXene/poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS)‐stack electrodes are fabricated through the combination of direct ink writing and femtosecond laser scribing. With a footprint area of only 20 mm2, the on‐paper MSCs exhibit excellent high‐rate capacitive behavior with an areal capacitance of 5.7 mF cm−2 and long cycle life (>95% capacitance retention after 10,000 cycles) at a high scan rate of 1000 mV s−1, outperforming most of the present on‐paper MSCs. Furthermore, the heterogeneous MXene/PEDOT:PSS electrodes can interconnect individual MSCs into metal‐free on‐paper MSC arrays, which can also be simultaneously charged/discharged at 1000 mV s−1, showing scalable capacitive performance. The heterogeneous MXene/PEDOT:PSS stacks are a promising electrode structure for on‐paper MSCs to serve as ultrafast miniaturized energy storage components for emerging paper electronics.
- Published
- 2024
- Full Text
- View/download PDF
4. Oil blotting paper for formalin fixation increases endoscopic ultrasound‐guided tissue acquisition‐collected sample volumes on glass slides
- Author
-
Takuo Yamai, Kenji Ikezawa, Yusuke Seiki, Ko Watsuji, Yasuharu Kawamoto, Takeru Hirao, Kazuma Daiku, Shingo Maeda, Makiko Urabe, Yugo Kai, Ryoji Takada, Kaori Mukai, Tasuku Nakabori, Hiroyuki Uehara, Sayoko Tsuzaki, Ayumi Ryu, Satoshi Tanada, Shigenori Nagata, and Kazuyoshi Ohkawa
- Subjects
comprehensive genomic profiling ,fine‐needle aspiration ,fine‐needle biopsy ,formalin fixation ,oil blotting paper ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Objectives Endoscopic ultrasound‐guided tissue acquisition (EUS‐TA) is used for pathological diagnosis and obtaining samples for molecular testing, facilitating the initiation of targeted therapies in patients with pancreatic cancer. However, samples obtained via EUS‐TA are often insufficient, requiring more efforts to improve sampling adequacy for molecular testing. Therefore, this study investigated the use of oil blotting paper for formalin fixation of samples obtained via EUS‐TA. Methods This prospective study enrolled 42 patients who underwent EUS‐TA for pancreatic cancer between September 2020 and February 2022 at the Osaka International Cancer Institute. After a portion of each sample obtained via EUS‐TA was separated for routine histological evaluation, the residual samples were divided into filter paper and oil blotting paper groups for analysis. Accordingly, filter paper and oil blotting paper were used for the formalin fixation process. The total tissue, nuclear, and cytoplasm areas of each sample were quantitatively evaluated using virtual slides, and the specimen volume and histological diagnosis of each sample were evaluated by an expert pathologist. Results All cases were cytologically diagnosed as adenocarcinoma. The area ratios of the total tissue, nuclear, and cytoplasmic portions were significantly larger in the oil blotting paper group than in the filter paper group. The frequency of cases with large amount of tumor cells was significantly higher in the oil blotting paper group (33.3%) than in the filter paper group (11.9%) (p = 0.035). Conclusions Oil blotting paper can increase the sample volume obtained via EUS‐TA on glass slides and improve sampling adequacy for molecular testing.
- Published
- 2024
- Full Text
- View/download PDF
5. Integrated Ink Printing Paper Based Self‐Powered Electrochemical Multimodal Biosensing (IFP−Multi) with ChatGPT–Bioelectronic Interface for Personalized Healthcare Management
- Author
-
Chuanyin Xiong, Weihua Dang, Qi Yang, Qiusheng Zhou, Mengxia Shen, Qiancheng Xiong, Meng An, Xue Jiang, Yonghao Ni, and Xianglin Ji
- Subjects
ChatGPT–bioelectronic interface ,electrochemical multimodal device ,multimodal biosensing ,paper based ,personal healthcare ,Science - Abstract
Abstract Personalized healthcare management is an emerging field that requires the development of environment‐friendly, integrated, and electrochemical multimodal devices. In this study, the concept of integrated paper‐based biosensors (IFP−Multi) for personalized healthcare management is introduced. By leveraging ink printing technology and a ChatGPT–bioelectronic interface, these biosensors offer ultrahigh areal‐specific capacitance (74633 mF cm−2), excellent mechanical properties, and multifunctional sensing and humidity power generation capabilities. More importantly, the IFP−Multi devices have the potential to simulate deaf‐mute vocalization and can be integrated into wearable sensors to detect muscle contractions and bending motions. Moreover, they also enable monitoring of physiological signals from various body parts, such as the throat, nape, elbow, wrist, and knee, and successfully record sharp and repeatable signals generated by muscle contractions. In addition, the IFP−Multi devices demonstrate self‐powered handwriting sensing and moisture power generation for sweat‐sensing applications. As a proof‐of‐concept, a GPT 3.5 model‐based fine‐tuning and prediction pipeline that utilizes recorded physiological signals through IFP−Multi is showcased, enabling artificial intelligence with multimodal sensing capabilities for personalized healthcare management. This work presents a promising and ecofriendly approach to developing paper‐based electrochemical multimodal devices, paving the way for a new era of healthcare advancements.
- Published
- 2024
- Full Text
- View/download PDF
6. Model moisture transport in oil‐paper insulation of transformer: Theory and experiment
- Author
-
Junjie Zhou, Zhicheng Wu, Yiran Guo, Rui Zhang, Wenbing Zhu, and Qiaogen Zhang
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract The insulation performance of oil paper insulation is significantly affected by moisture such that monitoring moisture content is important. However, it is difficult to obtain the moisture content accurately due to its dynamic change under multi physical fields. Studying the moisture transportation in oil paper insulation under multi physical fields becomes a vital method in solving the problem. A multi physical model describing moisture migration was proposed, which considered the effects of temperature on moisture in different existing states in oil‐immersed paper (OIP). The temperature distribution formed a vapour pressure gradient to drive moisture migration and affected migration speed. Then, experiments and simulations of moisture migration were performed, which showed that the experiments were in good agreement with simulation. The results revealed that the temperature gradient caused uneven moisture distribution and the increased temperature reduced OIP moisture content. The established model could fully characterise moisture migration under temperature gradient, which provided a theoretical reference for predicting the risk of partial dampness and evaluating insulation performance.
- Published
- 2024
- Full Text
- View/download PDF
7. Microscopic mechanisms analysis of various dielectric response processes in oil‐paper insulation with different insulating states
- Author
-
Zaijun Jiang, Jiefeng Liu, Xianhao Fan, Heng Zhang, Enze Zhang, Boshu Song, and Yiyi Zhang
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Various dielectric response processes in the oil‐paper insulation are sensitively affected by the insulating states (ageing degrees and moisture contents). However, the existing research is still incomplete in revealing the microscopic mechanisms of various dielectric response processes in oil‐paper insulation with different insulating states. Given this issue, the genetic algorithm is first adopted to extract the Dissado–Hill (D–H) model parameters by simulating the frequency domain spectroscopy (FDS) of oil‐paper insulation. Then, the change laws of the extracted D–H model parameters are adopted to reveal the microscopic mechanisms of various dielectric response processes. Microscopic mechanisms of four dielectric response processes are studied, which are quasi‐dc relaxation, loss peak relaxation, optical frequency relaxation, and DC conductance. Meanwhile, due to the dielectric response processes being dominated by various polar particles (methanol, ethanol, furfural, and water molecule), the contents of various ageing by‐products dissolved in the insulating oil are measured to support the above analysis. In this respect, a dielectric theoretical reference for the FDS technique to research the insulating states of oil‐paper insulation is provided.
- Published
- 2024
- Full Text
- View/download PDF
8. Research on the variation of dielectric properties of oil‐paper insulation for power equipment over a wide temperature range
- Author
-
Mingze Zhang, Muhe Yu, Wen Zhou, Yilin Liang, Shengjie Lei, Yunbo Shi, and Limin Qu
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract The main part of oil‐immersed power equipment is oil‐paper insulation. At lower ambient temperatures, transformer oil will become viscous. As a result, compared to those at room temperature or operating temperature, the frequency domain dielectric properties of oil‐paper insulation at low temperatures are drastically different. For evaluating the insulation condition of electrical equipment, it is essential to accurately determine their dielectric properties. This paper described the FDS test, the DC conductivity test, and the transformer oil viscosity test, which was carried out in a laboratory environment for different ageing of oil‐immersed pressboard and transformer oil at 233–373 K. The effects of temperature on the dielectric properties at the competing mechanisms of polarisation and conductivity loss were clarified based on variations of the FDS curves. Considering the viscosity change of ageing transformer oil at low temperatures, the Arrhenius and VFT viscosity equations were used to achieve a fitting calculation in the different temperature zones. Based on the molecular/ion transition model in the force field and electric field, the characterisation relationships between the dynamic viscosity, DC conductivity, and test temperature of transformer oil were established. The limitations of conventional transformer oil equivalent dielectric relaxation models over a wide temperature range were finally clarified by combining the test findings of the DC conductivity over a wide temperature range with observed and simulated calculations. This paper provides an essential theoretical reference when using the FDS test to diagnose the insulation performance of oil‐immersed power equipment in extremely cold regions.
- Published
- 2024
- Full Text
- View/download PDF
9. Skin‐Interfaced Bifluidic Paper‐Based Device for Quantitative Sweat Analysis
- Author
-
Muhan Deng, Xiaofeng Li, Kui Song, Hanlin Yang, Wenkui Wei, Xiaojun Duan, Xiaoping Ouyang, Huanyu Cheng, and Xiufeng Wang
- Subjects
distance‐based metric approach ,paper‐based microfluidic device ,sweat chloride ,sweat glucose ,sweat rate and volume ,Science - Abstract
Abstract The erratic, intermittent, and unpredictable nature of sweat production, resulting from physiological or psychological fluctuations, poses intricacies to consistently and accurately sample and evaluate sweat biomarkers. Skin‐interfaced microfluidic devices that rely on colorimetric mechanisms for semi‐quantitative detection are particularly susceptible to these inaccuracies due to variations in sweat secretion rate or instantaneous volume. This work introduces a skin‐interfaced colorimetric bifluidic sweat device with two synchronous channels to quantify sweat rate and biomarkers in real‐time, even during uncertain sweat activities. In the proposed bifluidic‐distance metric approach, with one channel to measure sweat rate and quantify collected sweat volume, the other channel can provide an accurate analysis of the biomarkers based on the collected sweat volume. The closed channel design also reduces evaporation and resists contamination from the external environment. The feasibility of the device is highlighted in a proof‐of‐the‐concept demonstration to analyze sweat chloride for evaluating hydration status and sweat glucose for assessing glucose levels. The low‐cost yet highly accurate device provides opportunities for clinical sweat analysis and disease screening in remote and low‐resource settings. The developed device platform can be facilely adapted for the other biomarkers when corresponding colorimetric reagents are exploited.
- Published
- 2024
- Full Text
- View/download PDF
10. Bibliometric analysis and visualization of top papers in dentistry from 2012 to 2022 based on essential science indicators
- Author
-
Amene Taghdisi kashani, Zahra Batooli, and Mostafa Mozafari
- Subjects
bibliometric analysis ,dentistry ,essential science indicators ,top papers ,Dentistry ,RK1-715 - Abstract
Abstract Objectives This study aims to analyze and visualize the top dental papers from 2012 to 2022 using data from essential science indicators (ESIs). Materials and Methods The present study was conducted using library and retrospective bibliometric analysis methods. Additionally, a science map has been created. Web of Science was searched on January 18, 2023. The results were limited to the top papers in ESIs. The bibliometric information of the top papers was evaluated. Next, the VOSviewer was used to perform a co‐occurrence analysis and visualize data. Results The findings showed that Mariano Belén Sanz and Maurizio S. Tonetti were the top two authors. The University of London and the University of Bern had the highest number of articles. These articles were published in 55 journals. According to the analysis of keyword co‐occurrence, the most frequently used keywords in the field of dentistry include “periodontitis,” “dental implants,” “periodontal disease,” “mechanical properties,” “peri‐implantitis,” “oral health,” “dental caries,” “dental materials,” “3D printing.” Conclusion The findings of this study enable readers to pinpoint the authors, organizations, countries, and journals that have made the biggest contributions to the list of the most often cited dentistry papers. In medicine, bibliometric citation analysis is frequently used to assist researchers in learning the fundamentals of a subject and pinpoint subtopics of broad interest for additional study.
- Published
- 2024
- Full Text
- View/download PDF
11. Monolithic Fabrication of Metal‐Free On‐Paper Self‐Charging Power Systems
- Author
-
Su, Yingchun, Xue, Han, Fu, Yujie, Chen, Shiqian, Li, Zheng, Li, Lengwan, Knoks, Ainars, Bogdanova, Olga, Lesničenoks, Pēteris, Palmbahs, Roberts, Laurila, Mika‐Matti, Mäntysalo, Matti, Hammar, Mattias, Hallén, Anders, Nordell, Nils, Li, Jiantong, Su, Yingchun, Xue, Han, Fu, Yujie, Chen, Shiqian, Li, Zheng, Li, Lengwan, Knoks, Ainars, Bogdanova, Olga, Lesničenoks, Pēteris, Palmbahs, Roberts, Laurila, Mika‐Matti, Mäntysalo, Matti, Hammar, Mattias, Hallén, Anders, Nordell, Nils, and Li, Jiantong
- Abstract
Self-charging power systems (SCPSs) are envisioned as promising solutions for emerging electronics to mitigate the increasing global concern about battery waste. However, present SCPSs suffer from large form factors, unscalable fabrication, and material complexity. Herein, a type of highly stable, eco-friendly conductive inks based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) are developed for direct ink writing of multiple components in the SCPSs, including electrodes for miniaturized spacer-free triboelectric nanogenerators (TENGs) and microsupercapacitors (MSCs), and interconnects. The principle of “one ink, multiple functions” enables to almost fully print the entire SCPSs on the same paper substrate in a monolithic manner without post-integration. The monolithic fabrication significantly improves the upscaling capability for manufacturing and reduces the form factor of the entire SCPSs (a small footprint area of ≈2 cm × 3 cm and thickness of ≈1 mm). After pressing/releasing the TENGs for ≈79000 cycles, the 3-cell series-connected MSC array can be charged to 1.6 V while the 6-cell array to 3.0 V. On-paper SCPSs are promising to serve as lightweight, thin, sustainable, and low-cost power supplies., QC 20240514
- Published
- 2024
- Full Text
- View/download PDF
12. The rise and fall of paper money in Yuan China, 1260–1368
- Author
-
Guan, Hanhui, Palma, Nuno, Wu, Meng, Guan, Hanhui, Palma, Nuno, and Wu, Meng
- Abstract
Following the Mongol invasion of China, the Yuan (1260–1368) dynasty was the first political regime to introduce a precious metal standard and deploy paper money as the sole legal tender. Drawing on a new dataset on money issues, prices, warfare, imperial grants, taxation, natural disasters, and population, we find that a silver standard initially consolidated the Chinese currency market. However, persistent fiscal pressures eventually compelled rulers to ease the monetary standard, and a fiat standard was adopted. We show that inflation was high in the early and late periods of the dynasty but remained moderate for nearly half a century. We find that military pressure, particularly civil war, generated fiscal demands that led to the over-issuance of money. By contrast, natural disasters and imperial grants did not trigger the over-issue of money. Warfare was much more likely to increase paper money issues under the fiat standard than during the silver standard period.
- Published
- 2024
13. Obstacles and opportunities in the functional analysis of extracellular vesicle RNA – an ISEV position paper
- Author
-
Mateescu, Bogdan, Kowal, Emma J. K., Van Balkom, Bas W. M. Emma J. K., Bartel, Sabine, Bhattacharyya, Suvendra N., Buzás, Edit I., Buck, Amy H., Candia, Paola de, Chow, Franklin W. N., Das, Saumya, Driedonks, Tom A. P., Fernández Messina, Lola María, Haderk, Franziska, Hill, Andrew F., Jones, Jennifer C., Van Keuren‐Jensen, Kendall R., Lai, Charles P., Lässer, Cecilia, di Liegro, Italia, Lunavat, Taral R., Lorenowicz, Magdalena J., Maas, Sybren L. N., Mäger, Imre, Mittelbrunn, Maria, Momma, Stefan, Mukherjee, Kamalika, Nawaz, Muhammad, Pegtel, D. Michiel, Pfaffl, Michael W., Schiffelers, Raymond M., Tahara, Hidetoshi, Théry, Clotilde, Tosar, Juan Pablo, Wauben, Marca H. M., Witwer, Kenneth W., Nolte‐'t Hoen, Esther N. M., Mateescu, Bogdan, Kowal, Emma J. K., Van Balkom, Bas W. M. Emma J. K., Bartel, Sabine, Bhattacharyya, Suvendra N., Buzás, Edit I., Buck, Amy H., Candia, Paola de, Chow, Franklin W. N., Das, Saumya, Driedonks, Tom A. P., Fernández Messina, Lola María, Haderk, Franziska, Hill, Andrew F., Jones, Jennifer C., Van Keuren‐Jensen, Kendall R., Lai, Charles P., Lässer, Cecilia, di Liegro, Italia, Lunavat, Taral R., Lorenowicz, Magdalena J., Maas, Sybren L. N., Mäger, Imre, Mittelbrunn, Maria, Momma, Stefan, Mukherjee, Kamalika, Nawaz, Muhammad, Pegtel, D. Michiel, Pfaffl, Michael W., Schiffelers, Raymond M., Tahara, Hidetoshi, Théry, Clotilde, Tosar, Juan Pablo, Wauben, Marca H. M., Witwer, Kenneth W., and Nolte‐'t Hoen, Esther N. M.
- Abstract
Acknowledgements We thank all participants of the 2015 ISEV workshop on EV-RNA for their valuable input in roundtable discussions, which formed the basis for this position paper. We are grateful to Dr P. Vader for preparing Figure 3., The release of RNA-containing extracellular vesicles (EV) into the extracellular milieu has been demonstrated in a multitude of different in vitro cell systems and in a variety of body fluids. RNA-containing EV are in the limelight for their capacity to communicate genetically encoded messages to other cells, their suitability as candidate biomarkers for diseases, and their use as therapeutic agents. Although EV-RNA has attracted enormous interest from basic researchers, clinicians, and industry, we currently have limited knowledge on which mechanisms drive and regulate RNA incorporation into EV and on how RNA-encoded messages affect signalling processes in EV-targeted cells. Moreover, EV-RNA research faces various technical challenges, such as standardisation of EV isolation methods, optimisation of methodologies to isolate and characterise minute quantities of RNA found in EV, and development of approaches to demonstrate functional transfer of EV-RNA in vivo. These topics were discussed at the 2015 EV-RNA workshop of the International Society for Extracellular Vesicles. This position paper was written by the participants of the workshop not only to give an overview of the current state of knowledge in the field, but also to clarify that our incomplete knowledge – of the nature of EV(-RNA)s and of how to effectively and reliably study them – currently prohibits the implementation of gold standards in EV-RNA research. In addition, this paper creates awareness of possibilities and limitations of currently used strategies to investigate EV-RNA and calls for caution in interpretation of the obtained data., Depto. de Biología Celular, Fac. de Ciencias Biológicas, TRUE, pub
- Published
- 2024
14. KH550‐SiO2/polyimide insulating paper preparation and characterisation
- Author
-
Minghe Chi, Xue Sun, Xiaorui Zhang, Jiahao Shi, Ling Weng, and Yang Yu
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Oil‐paper insulation material is an essential component for oil‐filled transformers, and polyimide (PI) insulation paper is a novel material in the field of electricity. The improvement of insulation class for insulation paper has gained significant attention in recent years. In this study, SiO2 nanoparticles were modified with a silane coupling agent (KH550), and the KH550‐SiO2 was added to the fibre membrane through in situ polymerisation. The chemical composition and microcosmic characteristics of the PI porous fibre membrane were characterised using FT‐IR and SEM FT‐IR and SEM. Consequently, the dielectric constant of the composite paper was reduced to 2.3 upon adding 3 wt% of KH550‐SiO2, and the dielectric strength reached its maximum value of 85 kV/mm. The results demonstrate that the insulation performance of the KH550‐SiO2/PI composite was significantly improved due to the incorporation of nano‐SiO2. This establishes an efficient approach for achieving excellent electrical and thermal properties in practical applications using the KH550‐SiO2/PI fibre membrane.
- Published
- 2024
- Full Text
- View/download PDF
15. A new type of lipophilic hydrophobic self‐repairing cellulose insulating paper developed with ST‐110/FAS/PTFE ternary system as coating substrate
- Author
-
Zhenglin Zeng, Jinshan Qin, Zuhao Wang, Weimin Tan, and Chao Tang
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract The moisture generated by the ageing of the oil‐paper insulating system can easily lead to the deterioration of the performance of the insulating paper. In order to alleviate the impact of moisture on the performance of the insulating paper, we developed a kind of lipophilic hydrophobic self‐repairing cellulose insulating paper (new insulating paper) based on the ternary system of polytetrafluoroethylene, fluorocarbon surfactant and fluorinated alkyl silane, and accelerated thermal ageing test for 45 days at 130°C was carried out. The experimental results show that the new insulating paper with excellent lipophilic property can realise hydrophobic self‐repairing through heat treatment after physical damage. The tensile strength and elongation at break of the new insulating paper increased by 5%–8% and 6.25%–27% respectively compared with the original cellulose insulating paper. At the end of ageing, the relative dielectric constant and dielectric loss factor of new insulating paper are 10.4% and 9.9% lower than that of the original cellulose insulating paper, while the breakdown voltage is 6.8% higher. The acid and moisture content produced during the ageing process of the insulating oil impregnated with new insulating paper are also less, indicating that the coating can delay the ageing of the insulating paper.
- Published
- 2024
- Full Text
- View/download PDF
16. A novel artificial neural network approach for residual life estimation of paper insulation in oil‐immersed power transformers
- Author
-
Md. Manzar Nezami, Md. Danish Equbal, Md. Fahim Ansari, Majed A. Alotaibi, Hasmat Malik, Fausto Pedro García Márquez, and Mohammad Asef Hossaini
- Subjects
condition monitoring ,fault diagnosis ,neural nets ,power transformer insulation ,power transformers ,remaining life assessment ,Applications of electric power ,TK4001-4102 - Abstract
Abstract Avoiding financial losses requires preventing catastrophic oil‐filled power transformer breakdowns. Continuous online transformer monitoring is needed. The authors use paper insulation to evaluate transformer health for continuous online transformer monitoring. The study suggests a new artificial intelligence method for estimating paper insulation residual life in oil‐immersed power transformers. The four artificial intelligence models use backpropagation‐based neural networks to predict paper insulation lifespan. Four primary transformer insulating paper failure indices—degree of polymerisation, 2‐furfuraldehyde, carbon monoxide, and carbon dioxide—form the basis of these models. Each model, including the backpropagation‐based neural networks, estimates paper insulation life using one failure index, along with moisture and temperature data. Optimisation techniques enhance hidden layer neurons and epoch count for improved performance. Results are validated against literature‐based life models, establishing a precise input–output correlation. This method accurately predicts the remaining useable life of power transformer paper insulation, enabling utilities to take proactive measures for safe and efficient transformer operation.
- Published
- 2024
- Full Text
- View/download PDF
17. Assessing the moisture content of oil‐impregnated paper bushings with a simple and fast method
- Author
-
Hossein Taghizade Ansari and Abolfazl Vahedi
- Subjects
dielectric properties ,frequency‐domain analysis ,impregnated insulation ,power transformers ,transformer insulation ,Applications of electric power ,TK4001-4102 - Abstract
Abstract Power outages can cause harm to both society and individual health. Among the crucial elements of power systems, power transformers play a vital role, and their failures can lead to incidents and disruptions. According to statistics, almost 50% of the explosions and fires in the power transformer are caused by oil‐impregnated paper (OIP) bushing failures. Moreover, moisture is a crucial factor that affects the health of OIP bushings, and assessing the moisture level in OIP bushings is vital to guarantee the safety of power systems. While the frequency‐domain dielectric spectroscopy (FDS) method has been widely used to assess the moisture content of OIP bushings on‐site, it has the disadvantage of requiring a long measurement time. Therefore, a novel technique was proposed in this study that involves measuring the OIP bushing dissipation factor (tanδ) at 1 Hz to estimate the moisture content in a significantly shorter time. Five samples of OIP with various moisture levels have been selected, and an equation based on the OIPs' value of tanδ at 1 Hz was proposed to assess the moisture level of OIP bushings. Furthermore, the validity of the proposed method was successfully verified, proving its precision and time efficiency.
- Published
- 2024
- Full Text
- View/download PDF
18. A scoping review of academic papers on human–lion conflict in Africa
- Author
-
Jackie Abell, Donna Oldbury‐Thomas, and Catherine Mazhandu
- Subjects
African lion ,coexistence ,human–lion conflict ,indigenous knowledge ,interdisciplinarity ,knowledge gaps ,Ecology ,QH540-549.5 ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Abstract Adopting a scoping review method, we examined peer‐reviewed academic papers published about human–lion conflict (HLC) (including coexistence) and identified knowledge gaps. We searched papers published between January 1981 and December 2023 using academic databases, with the key terms African lion, human–lion conflict, human–lion coexistence, and human–lion interaction. This produced 485 records, reduced to 137 after using additional criteria. Ninety‐eight papers were focused on lions in Kenya, Tanzania, Zimbabwe, and Botswana. Ten pan‐African studies were identified in our review. Our inductive analysis identified four themes related to HLC: attitudes and perceptions toward lions, causes of HLC, consequences of HLC, and mitigating HLC. Some limitations identified in systematic reviews of human–wildlife conflict have been addressed in recent years, such as broadening the geographical scale of research. However, some knowledge gaps remain, including a lack of assessment of mitigation strategies and studies on climate changes impact on human–lion conflict. Addressing the knowledge gaps highlighted in this review will require diversifying the disciplinary composition of the research teams and increasing researcher reflexivity.
- Published
- 2024
- Full Text
- View/download PDF
19. Paper‐Based Hydroelectric Generators for Water Evaporation‐Induced Electricity Generation
- Author
-
Jingjing Zhang, Peng Cui, Jingjing Wang, Huan Meng, Ying Ge, Can Feng, Huimin Liu, Yao Meng, Zunkang Zhou, Ningning Xuan, Bao Zhang, Gang Cheng, and Zuliang Du
- Subjects
evaporation ,hydroelectric generators ,membrane ,paper ,power generation ,Science - Abstract
Abstract The research presented in this paper introduces a novel environmental energy‐harvesting technology that harnesses electricity from the evaporation of water using porous structural materials. Specifically, a strategy employing paper‐based hydroelectric generators (p‐HEGs) is proposed to capture the energy produced during water evaporation and convert it into usable electricity. The p‐HEGs offer several advantages, including simplicity in fabrication, low cost, and reusability. To evaluate their effectiveness, the water evaporation‐induced electrical output performance of four different p‐HEGs are compared. Among the variants tested, the p‐HEG combining wood pulp and polyester fiber exhibits the best output performance. At room temperature, this particular p‐HEG generates a short‐circuit current and open‐circuit voltage of ≈0.4 µA and 0.3 V, respectively, thereby demonstrating excellent electrical stability. Furthermore, the electrical current and voltage generated by the p‐HEG through water evaporation are able to power an LED light, both individually and in series and parallel connections. This study delves into the potential of electricity harvesting from water evaporation and establishes it as a viable method for renewable energy applications.
- Published
- 2023
- Full Text
- View/download PDF
20. Improvement of breakdown and flashover properties against thermal aging of oil paper insulation through addition of TiO2 nanoparticles
- Author
-
Meng Huang, Sai Li, Lei Zhang, Yuanxin Yao, Yuzhen Lv, Xin Chen, and Wenli Pang
- Subjects
nanoparticles ,paper ,thermal analysis ,electric breakdown ,electric field measurement ,insulating oils ,Distribution or transmission of electric power ,TK3001-3521 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract TiO2 nanoparticles can improve the electrical performance of oil paper insulation. In this study, 10 nm TiO2 nanoparticles were prepared and dispersed into transformer oil, and then immerse pressboards in it to obtain nanofluid impregnated pressboards (NP). Its thermal aging was accelerated together with the reference sample at 130°C for 36 days. Analyzing the acid value in the oil, polymerization degree, surface topography, AC breakdown strength, surface flashover characteristics and surface potential decay characteristics. It was observed that TiO2 nanoparticles can reduce the acid value and improve AC breakdown strength of oil. However, the degree of polymerization and surface appearance of NP and oil impregnated pressboards (OP) during thermal aging did not differ significantly. During the aging process, the energy level of pressboard surface traps shifted first towards the shallow and then gradually towards the deep. During all the aging stages, the surface flashover voltage of NP was always higher or close to that of OP. The mechanism of TiO2 nanoparticles improving the breakdown and surface flashover characteristics of oil–paper insulation during thermal aging is discussed from the perspective of water molecules and aging by‐products adsorption and introduction of shallow traps by nanoparticles.
- Published
- 2023
- Full Text
- View/download PDF
21. Dynamics of an impurity ion transport in oil‐paper insulation under various electric fields
- Author
-
Yuanyang Ren, Yang Wang, Qiankai Zhang, Jiayu Xiong, Wen Cao, Zepeng Lv, and Kai Wu
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract The ionic transport process is an important counterpart to charge transport in oil‐paper insulation, and it significantly impacts oil flow electrification at the oil‐paper interface. Despite this, the dynamics of this phenomenon and the underlying mechanisms remain unclear, particularly at the molecular level. To understand this fundamental aspect, we conduct Molecular Dynamics study on the transport behaviour of an impurity ion in different oil‐paper insulation models under various external electric fields. Different influence factors, such as external electric fields, temperatures, and local structural characteristics, are investigated in relation to the corresponding ionic mobility in different polymer models. According to the simulations, ionic mobility and its response to electric fields are higher in weaker electrostatic models. As a result, mineral oil exhibits the highest ionic mobility and the most substantial enhancement of ionic mobility by external electric fields, followed by vegetable oil, oil‐paper blends, and insulating paper. This significant deviation in ionic mobility between oil and paper leads to the formation of an electric double layer near the oil‐paper interface. The underlying physical mechanisms of different ionic mobility and its response to the electric field in different polymer models could be explained by the different polymer structural influences in terms of interaction energy and coordination numbers in a static manner, as well as by the interactions between the impurity ion and its surrounding atoms in terms of lifetime correlation functions and velocity autocorrelation functions in a dynamic manner. In addition, the influence of temperature on ionic mobility in mineral and vegetable oil is examined, and their activation energies are calculated. Advancing in the fundamental understanding of the dynamics of the ion transport process in oil‐paper insulation is vital to improving their insulating properties for oil‐impregnated power transformers.
- Published
- 2024
- Full Text
- View/download PDF
22. Using incident reports to diagnose communication challenges for precision intervention in learning health systems: A methods paper
- Author
-
Rebecca R. S. Clark, Tamar Klaiman, Kathy Sliwinski, Rebecca F. Hamm, and Emilia Flores
- Subjects
communication ,health equity ,healthcare team ,incident reports ,maternal health ,Medicine (General) ,R5-920 ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Introduction Poor communication is a leading root cause of preventable maternal mortality in the United States. Communication challenges are compounded with the presence of biases, including racism. Hospital administrators and clinicians are often aware that communication is a problem, but understanding where to intervene can be difficult to determine. While clinical leadership routinely reviews incident reports and acts on them to improve care, we hypothesized that reviewing incident reports in a systematic way might reveal thematic patterns, providing targeted opportunities to improve communication in direct interaction with patients and within the healthcare team itself. Methods We abstracted incident reports from the Women's Health service and linked them with patient charts to join patient's race/ethnicity, birth outcome, and presence of maternal morbidity and mortality to the incident report. We conducted a qualitative content analysis of incident reports using an inductive and deductive approach to categorizing communication challenges. We then described the intersection of different types of communication challenges with patient race/ethnicity and morbidity outcomes. Results The use of incident reports to conduct research on communication was new for the health system. Conversations with health system‐level stakeholders were important to determine the best way to manage data. We developed a thematic codebook based on prior research in healthcare communication. We found that we needed to add codes that were equity focused, as this was missing from the existing codebook. We also found that clinical and contextual expertise was necessary for conducting the analysis—requiring more resources to conduct coding than initially estimated. We shared our findings back with leadership iteratively during the work. Conclusions Incident reports represent a promising source of health system data for rapid improvement to transform organizational practice around communication. There are barriers to conducting this work in a rapid manner, however, that require further iteration and innovation.
- Published
- 2024
- Full Text
- View/download PDF
23. Guest Editorial: Selected papers from RADAR 2022—International Conference on Radar Systems (Edinburgh, UK)
- Author
-
Carmine Clemente and Alessio Balleri
- Subjects
radar ,radar signal processing ,Telecommunication ,TK5101-6720 - Published
- 2024
- Full Text
- View/download PDF
24. Psychological aspects of rehabilitation nutrition: A position paper by the Japanese Association of Rehabilitation Nutrition (secondary publication)
- Author
-
Hidetaka Wakabayashi, Takashi Mori, Shinta Nishioka, Keisuke Maeda, Yoshihiro Yoshimura, Yuki Iida, Ai Shiraishi, and Dai Fujiwara
- Subjects
cognitive behavioral therapy ,depression ,mindfulness ,positive psychology ,well‐being ,Medicine (General) ,R5-920 - Abstract
Abstract Psychological aspects of rehabilitation nutrition affect physical, cognitive, and social rehabilitation nutrition. When depression is recognized, not only pharmacotherapy and psychotherapy, but also non‐pharmacological therapies such as exercise, nutrition, psychosocial, and other interventions can be expected to improve depression. Therefore, accurate diagnosis and intervention without overlooking depression is important. Psychological aspects of preventive rehabilitation nutrition is also important because depression can be partially prevented by appropriate exercise and nutritional management. Even in the absence of psychological negatives, increasing more psychological positives from a positive psychology perspective can be useful for both patients and healthcare professionals. Positive rehabilitation nutrition interventions can increase more psychological positives, such as well‐being, through cognitive‐behavioral therapy and mindfulness on their own, as well as through interventions on environmental factors. Consequently, physical, cognitive, and social positives are also expected to be enhanced.
- Published
- 2024
- Full Text
- View/download PDF
25. A review on the research progress and future development of nano‐modified cellulose insulation paper
- Author
-
Chao Tang, Rui Chen, Jinzhu Zhang, Xiao Peng, Binghao Chen, and Liusheng Zhang
- Subjects
ageing ,composite materials ,dielectric materials ,electric strength ,nanoparticles ,paper ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract Focussing on the insulating material of power transformer—cellulose insulation paper, this paper first introduces the basic characteristics and engineering application background of insulation paper. Then, the research progress of improving the mechanical properties, thermal stability and electrical properties of insulation paper by nano modification in recent years is compared, and the promotion mechanism is analysed. In addition, in practical engineering application, the oil–paper composite insulation system composed of insulation paper and insulating oil is used for the internal insulation of oil immersed transformer. Therefore, the influence of modified insulation paper on the performance of oil–paper composite insulation system is analysed. Finally, the newly reported new insulation paper is introduced, and the future development trend of modification of traditional insulation paper is analysed.
- Published
- 2022
- Full Text
- View/download PDF
26. The United European Gastroenterology green paper-climate change and gastroenterology.
- Author
-
Duijvestein M, Sidhu R, Zimmermann K, Carrington EV, Hann A, Sousa P, Touw HRW, van Hooft JE, and Müller M
- Abstract
Climate change, described by the World Health Organization (WHO) in 2021 as 'the single biggest health threat facing humanity', causes extreme weather, disrupts food supplies, and increases the prevalence of diseases, thereby affecting human health, medical practice, and healthcare stability. Greener Gastroenterology is an important movement that has the potential to make a real difference in reducing the impact of the delivery of healthcare, on the environment. The WHO defines an environmentally sustainable health system as one which would improve, maintain or restore health while minimizing negative environmental impacts. Gastroenterologists encounter the impacts of climate change in daily patient care. Alterations in the gut microbiome and dietary habits, air pollution, heat waves, and the distribution of infectious diseases result in changed disease patterns affecting gastrointestinal and hepatic health, with particularly severe impacts on vulnerable groups such as children, adolescents, and the elderly. Additionally, women are disproportionally affected, since climate change can exacerbate gender inequalities. Paradoxically, while healthcare aims to improve health, the sector is responsible for 4.4% of global carbon emissions. Endoscopy is a significant waste producer in healthcare, being the third highest generator with 3.09 kg of waste per day per bed, contributing to the carbon footprint of the GI sector. Solutions to the climate crisis can offer significant health co-benefits. Steps to reduce our carbon footprint include fostering a Planetary Health Diet and implementing measures for greener healthcare, such as telemedicine, digitalization, education, and research on sustainable healthcare practices. Adhering to the principles of 'reduce, reuse, recycle' is crucial. Reducing unnecessary procedures, which constitute a significant portion of endoscopies, can significantly decrease the carbon footprint and enhance sustainability. This position paper by the United European Gastroenterology aims to raise awareness and outline key principles that the GI workforce can adopt to tackle the climate crisis together., (© 2024 The Author(s). United European Gastroenterology Journal published by Wiley Periodicals LLC on behalf of United European Gastroenterology.)
- Published
- 2024
- Full Text
- View/download PDF
27. Caring for critically ill patients with a mental illness: A discursive paper providing an overview and case exploration of the delivery of intensive care to people with psychiatric comorbidity
- Author
-
Dylan Flaws, Sue Patterson, Todd Bagshaw, Kym Boon, Justin Kenardy, David Sellers, and Oystein Tronstad
- Subjects
critical illness ,ICU ,mental illness ,nursing ,psychiatry ,Nursing ,RT1-120 - Abstract
Abstract Aim To address the need for additional education in the management of mental illness in the critical care setting by providing a broad overview of the interrelationship between critical illness and mental illness. The paper also offers practical advice to support critical care staff in managing patients with mental illness in critical care by discussing two hypothetical case scenarios involving aggressive and disorganised behaviour. People living with mental illness are over‐represented among critically unwell patients and experience worse outcomes, contributing to a life expectancy up to 30 years shorter than their peers. Strategic documents call for these inequitable outcomes to be addressed. Staff working in intensive care units (ICUs) possess advanced knowledge and specialist skills in managing critical illness but have reported limited confidence in managing patients with comorbid mental illness. Design & Methods A discursive paper, drawing on clinical experience and research of the authors and current literature. Results Like all people, patients with mental illnesses draw on their cognitive, behavioural, social and spiritual resources to cope with their experiences during critical illness. However, they may have fewer resources available due to co‐morbid mental illness, a history of trauma and social disadvantage. By identifying and sensitively addressing patients' underlying needs in a trauma‐informed way, demonstrating respect and maximising patient autonomy, staff can reduce distress and disruptive behaviours and promote recovery. Caring for patients who are distressed and/or display challenging behaviours can evoke strong and unpleasant emotional responses. Self‐care is fundamental to maintaining a compassionate approach and effective clinical judgement. Staff should be enabled to accept and acknowledge emotional responses and access support—informally with peers and/or through formal mechanisms as needed. Organisational leadership and endorsement of the principles of equitable care are critical to creation of the environment needed to improve outcomes for staff and patients. Relevance to clinical practice ICU nurses hold an important role in the care of patients with critical illnesses and are ideally placed to empower, advocate for and comfort those patients also living with mental illness. To perform these tasks optimally and sustainably, health services have a responsibility to provide nursing staff with adequate education and training in the management of mental illnesses, and sufficient formal and informal support to maintain their own well‐being while providing this care. Patient and public involvement This paper is grounded in accounts of patients with mental illness and clinicians providing care to patients with mental illness in critical care settings but there was no direct patient or public contribution.
- Published
- 2023
- Full Text
- View/download PDF
28. The bubble formation characteristics of oil‐paper insulation and its influence on insulation performance
- Author
-
Yiyi Zhang, Qianlun Du, Wenchang Wei, Wenqiang Wang, Gang Wang, Yansong Liu, and Qing Xie
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Engineering experience shows that for transformers with long service life and serious moisture exposure, the inter‐turn paper insulation inside the winding will precipitate bubbles under the condition of electric field and conductor heating, which will endanger the equipment insulation. In order to explore the influence factors of bubbles formation in the moist insulating paper of transformers, based on the existing research on the influence of moisture content and gas dissolution in transformer oil, this study further considers the influence of air pressure (AP) and electric field and establishes an experimental platform to change the air pressure and electric field, thereby studying the formation characteristics of bubbles in oil‐paper insulation. The results show that air pressure and electric field can affect the initial temperature, volume, and shape of bubble formation. From 0 to −0.05 MPa for air pressure, the initial temperature of bubble generation decreased by 41°C, its maximum two‐dimensional projected area increased by 418.4% with more severe distortion, and the breakdown voltage decreased. When the AC voltage applied on the needle plate electrode increased from 0 to 10 kV, the initial temperature of bubble formation increased by 29°C, and the maximum two‐dimensional projection area increased by 336.6%.
- Published
- 2023
- Full Text
- View/download PDF
29. Degree of polymerisation estimation for insulation paper immersed in silicone oil using frequency domain dielectric spectroscopy
- Author
-
Lijun Zhou, Jun Zhang, Zhixin Li, Rongting Wen, Dongyang Wang, Jiekang Wu, and Huiling Tang
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Frequency domain dielectric spectroscopy (FDS) is an effective method reflecting the changes of ageing status of silicone oil‐immersed insulation paper. For better evaluating the ageing status of silicone oil‐immersed insulation paper, an evaluation method was studied by analysing the ageing kinetic model and results of FDS. First, the method to separate the different polarization losses and conductivity loss from the results of FDS was studied. Then, based on the idea of ageing correction translation coefficient and time‐varying pre exponential factor, the zero order ageing dynamic model was modified, which combines the ageing kinetic model with the results of FDS. Finally, the evaluation method for the degree of polymerisation (DP) of silicone oil‐immersed paper was proposed, and experiments were conducted to obtain the parameters in the modified model and then to verify the proposed method. The results show that the proposed method can be used to evaluate the DP effectively.
- Published
- 2023
- Full Text
- View/download PDF
30. Study on water absorption and dielectric response of epoxy resin impregnated paper bushing
- Author
-
Daning Zhang, Xinyuan Feng, Zhi Yang, Haisong Xu, Jiongting Jiang, Haibao Mu, and Guan‐Jun Zhang
- Subjects
dielectric losses ,dielectric materials ,frequency response ,insulation testing ,Distribution or transmission of electric power ,TK3001-3521 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract Epoxy‐impregnated paper transformer bushings are prone to water absorption due to the presence of water‐attracting moieties in the cellulose chemical structure and epoxy resin, leading to moisture‐induced insulation defects. To understand the mechanism of moisture's impact on epoxy‐impregnated paper, this study developed a testing platform that integrated moisture diffusion, adsorption, and dielectric properties of insulating materials. Insulation specimens made of epoxy resin and epoxy‐impregnated paper were prepared and their water diffusion characteristics were investigated using the Fick diffusion model and the Langmuir model, respectively. The Guggenheim–Anderson–de Boer equation was used to examine the vacuum vapour adsorption characteristics of the materials, providing a theoretical foundation for examining the form of water present within them. The dielectric response of materials with varying moisture levels was then tested to study the effect of water on the dielectric spectrum curve. Using the Extended Derivative Method, the characteristic frequency reflecting the water content of the epoxy‐impregnated paper was extracted. The results demonstrate that 0.01‐Hz characteristic frequency provides superior accuracy for moisture assessment in epoxy resins compared to 50 Hz, and extracting and fitting the relaxation peak characteristic frequency in epoxy‐impregnated paper moisture evaluation yields higher accuracy than using tan δ at the power frequency.
- Published
- 2023
- Full Text
- View/download PDF
31. All‐Printed Flexible Hygro‐Thermoelectric Paper Generator
- Author
-
Haoyu Shen, Ke Xu, Yulong Duan, Peilin Wu, Zhiyun Qian, Yonghao Chen, Yao Luo, Chaocheng Liu, Yang Li, Jiedong Cui, and Detao Liu
- Subjects
hygrothermal resources ,hygro‐thermoelectricity ,ion‐electron ink ,paper generator ,sustainability ,Science - Abstract
Abstract The conversion of ubiquitous hygrothermal resources into renewable energy offers significant potential for cable‐free, self‐powered systems that can operate worldwide without regard to climatic or geographic limitations. Here, an all‐printed flexible hygro‐thermoelectric paper generator is demonstrated that uses bifunctional mobile ions and electrons to make the moist‐diffusion effect, the Soret effect, and the Seebeck effect work synergistically. In the ordinary hygrothermal settings, it generates an unconventional hygro‐thermoelectric output pattern and shows almost a dozen‐fold increase in positive hygro‐thermopower of 26.70 mV K−1 and also another negative hygro‐thermopower of −15.71 mV K−1 compared to pure thermopower. A single paper generator can produce a giant 680 mV displaying typical cyclic sinusoidal waveform characters with volt‐sized amplitudes. The ion‐electron conductive ink is easily printable and consists primarily of a Bi2Te3/PEDOT:PSS thermoelectric matrix modulated with a hygroscopic glycerol that releases ion charges for moist‐diffusion effect and Soret effect, as well as electron charges for Seebeck effect. The emerged hygro‐thermoelectric harvesting strategy from surrounding hygrothermal resources offers a revolutionary approach to the next generation of hybrid energy with cost‐efficiency, flexibility, and sustainability, and also enables large‐scale roll‐to‐roll production.
- Published
- 2023
- Full Text
- View/download PDF
32. Oil‐paper insulation partial discharge ultrasonic multifrequency sensing array based on fibre‐optic Fabry–Perot sensor
- Author
-
Zhixian Zhang, Jiali Lei, Weigen Chen, Tianhe Yang, Yuxuan Song, Kejie Wu, and Fan Liu
- Subjects
paper ,fibre optic sensors ,sensor arrays ,partial discharge measurement ,ultrasonic transducer arrays ,insulating oils ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract In order to improve the sensitivity and accuracy of oil‐paper insulation partial discharge detection by the fibre‐optic Fabry–Perot (FP) ultrasonic sensor, this work studied the ultrasonic signal’s frequency characteristics of typical oil‐paper insulation partial discharges and the vibration characteristics of the FP sensor’s diaphragm in the liquid environment. Based on the works above, a multifrequency FP sensor array is proposed, consisting of several FP sensors with different resonant frequencies to detect partial discharges. The experimental results show that the liquid environment has a significant effect on the vibration characteristics of the FP sensor’s diaphragm, and the sensitivity and accuracy of partial discharge detection can be improved based on the multifrequency FP sensing array, which can also be applied in the pattern recognition and localisation of partial discharges.
- Published
- 2022
- Full Text
- View/download PDF
33. Portable Paper‐Based Nucleic Acid Enrichment for Field Testing
- Author
-
Junyang Mei, Dandan Wang, Yiheng Zhang, Dan Wu, Jinhui Cui, Mingzhe Gan, and Peifeng Liu
- Subjects
carcinogenic infection ,field‐deployable ,minimum instrument requirement ,paper‐based nucleic acid enrichment ,point‐of‐care testing ,SARS‐CoV‐2 ,Science - Abstract
Abstract Point‐of‐care testing (POCT) can be the method of choice for detecting infectious pathogens; these pathogens are responsible for not only infectious diseases such as COVID‐19, but also for certain types of cancers. For example, infections by human papillomavirus (HPV) or Helicobacter pylori (H. pylori) are the main cause of cervical and stomach cancers, respectively. COVID‐19 and many cancers are treatable with early diagnoses using POCT. A variety of nucleic acid testing have been developed for use in resource‐limited environments. However, questions like unintegrated nucleic acid extraction, open detection systems increase the risk of cross‐contamination, and dependence on expensive equipment and alternating current (AC) power supply, significantly limit the application of POCT, especially for on‐site testing. In this paper, a simple portable platform is reported capable of rapid sample‐to‐answer testing within 30 min based on recombinase polymerase amplification (RPA) at a lower temperature, to detect SARS‐CoV‐2 virus and H. pylori bacteria with a limit of detection as low as 4 × 102 copies mL−1. The platform used a battery‐powered portable reader for on‐chip one‐pot amplification and fluorescence detection, and can test for multiple (up to four) infectious pathogens simultaneously. This platform can provide an alternative method for fast and reliable on‐site diagnostic testing.
- Published
- 2023
- Full Text
- View/download PDF
34. Paper-Based Bacterial Lysis Enables Sample-to-Answer Home-based DNA Testing
- Author
-
Chondrogiannis, Georgios, Reu, Pedro, Hamedi, Mahiar, Chondrogiannis, Georgios, Reu, Pedro, and Hamedi, Mahiar
- Abstract
Nucleic acid amplification testing (NAAT) is the gold standard for infectious disease diagnostics. Currently NAATs are mainly limited to centralized laboratories, while paper-based antigen tests are used for rapid home-based diagnostics. DNA extraction, the initial sample preparation step in NAATs, remains a bottleneck that hinders its development toward home-based kits. This step requires the use of compounds detrimental to the enzymes in downstream DNA amplification. Here, this work overcomes this bottleneck by immobilizing the enzyme achromopeptidase (ACP) on nitrocellulose, to both store and enable the separation of the enzymes from the other steps. This work provides proof-of-concept that immobilized ACP is effective at lysis and release of amplifiable DNA from gram-positive Staphylococcus epidermidis and enables the use of the lysate directly for DNA amplification, without the need for heat deactivation of the enzyme. This sample preparation method requires only incubation at 37 °C and mild agitation, which allows to implement it with fully disposable and affordable equipment. Consequently, this work enables to combine the paper-based DNA extraction method with the isothermal recombinase polymerase amplification (RPA) followed by lateral flow detection to demonstrate a sample-to-answer NAAT packaged as an instrument free self-test kit expanding the capabilities of home-testing beyond antigen tests., QC 20230614
- Published
- 2023
- Full Text
- View/download PDF
35. What makes an orthopaedic paper highly citable? A bibliometric analysis of top orthopeadic journals with 10‐year follow up
- Author
-
Mirjam Lutter, Henrik Rudolf, Robert Lenz, Thilo Hotfiel, and Thomas Tischer
- Subjects
Bibliometric analysis ,Orthopaedic ,Citations ,Top paper ,Impact factor ,Orthopedic surgery ,RD701-811 - Abstract
Abstract Purpose To examine a series of papers from top ranked orthopaedic journals with respect to the number of citations over a 10‐year observation period to identify factors that lead to high citation rates. Methods The Web of Science database was consulted to identify all published papers from the first‐year term of 2010 (January‐May) from four top orthopaedic journals: AJSM, Arthroscopy, JBJS Am and KSSTA. The database was used to analyze and compare the papers with respect to their characteristics and citations up to 2019. Basic information for each paper was collected including the author, country, study type and average citations per year (ACY). The most (Top20%) and least (Bottom20%) frequently cited papers were identified and differences were extracted. Results Five hundred sixteen papers were included with a total of 19,261 citations. Most of the published papers were from the United States (n = 245). On average, a paper received 37.3 citations over the 10‐year observation period. The most cited paper was cited 322 times. The most cited study type was randomized controlled trial (RCT) (Ø80.8). The Top20% papers were cited 37 times more often than the Bottom20%. Among the Top20%, the largest group was cohort study (n = 20) followed by case series (n = 19). Among others, the number of authors, the number of keywords and the number of references significantly correlated with the number of citations (p
- Published
- 2023
- Full Text
- View/download PDF
36. Biodegradable, Water‐Resistant, Anti‐Fizzing, Polyester Nanocellulose Composite Paper Straws
- Author
-
Hojung Kwak, Hyeri Kim, Seul‐A Park, Minkyung Lee, Min Jang, Sung Bae Park, Sung Yeon Hwang, Hyo Jeong Kim, Hyeonyeol Jeon, Jun Mo Koo, Jeyoung Park, and Dongyeop X. Oh
- Subjects
paper straws ,cellulose nanocrystals ,water resistance ,marine biodegradation ,anti‐fizzing ,Science - Abstract
Abstract Among plastic items, single‐use straws are particularly detrimental to marine ecosystems because such straws, including those made of poly(lactic acid) (PLA), are sharp and extremely slowly degradable in the ocean. While paper straws are promising alternatives, they exhibit hydration‐induced swelling even when coated with a non‐degradable plastic coating and promote effervescence (fizzing) in soft drinks owing to their surface heterogeneities. In this study, upgraded paper straw is coated with poly(butylene succinate) cellulose nanocrystal (PBS/CNC) composites. CNC increases adhesion to paper owing to their similar chemical structures, optimizes crystalline PBS spherulites through effective nucleation, and reinforces the matrix through its anisotropic and rigid features. The straws are not only anti‐fizzing when used with soft drinks owing to their homogeneous and seamless surface coatings, but also highly water‐resistant and tough owing to their watertight surfaces. All degradable components effectively decompose under aerobic composting and in the marine environment. This technology contributes to United Nations Sustainable Development Goal 14 (Life Below Water).
- Published
- 2023
- Full Text
- View/download PDF
37. Plus ça change, plus c'est la même chose: On our quattuordecennial, a good Methods paper still is not about my friend the dolphin
- Author
-
A. M. Ellison
- Subjects
Ecology ,QH540-549.5 ,Evolution ,QH359-425 - Published
- 2023
- Full Text
- View/download PDF
38. Reply to the discussion and comments of Azerêdo et al. (2023) and Schneider et al. (2023) on the paper by Magalhães et al. ‘Middle Jurassic multi‐scale transgressive–regressive cycles: An example from the Lusitanian Basin’, The Depositional Record, 9, 174–202
- Author
-
Antonio J. C. Magalhães, Gerson J. S. Terra, Felipe Guadagnin, Daniel G. C. Fragoso, Mirian C. Menegazzo, Nuno L. A. Pimentel, Sissa Kumaira, Gerson Fauth, Alessandra Santos, David K. Watkins, Mauro D. R. Bruno, Daiane Ceolin, Simone Baecker‐Fauth, Guilherme P. R. Gabaglia, Washington L. E. Teixeira, and Francisco P. Lima‐Filho
- Subjects
Geology ,QE1-996.5 - Abstract
Reply to the discussion and comments of Azerêdo et al. (2023) and Schneider et al. (2023).
- Published
- 2023
- Full Text
- View/download PDF
39. Microcosmic mechanism and correction of moisture effect on furfural diffusion and equilibrium in oil‐paper insulation
- Author
-
Dawei Feng, Ge Chen, Yuandi Lin, Ruijin Liao, and Dayong Yuan
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Furfural content in oil is considered as an effective parameter to evaluate the ageing state of oil‐immersed transformers. In previous thermal ageing experiments at 130°C, we found that moisture increment in oil‐paper system makes more furfural distribute in oil. However, the microcosmic mechanism of moisture effect on furfural diffusion from paper to oil is still unknown, and the furfural equilibrium law at transformers' typical operating temperatures is also unclear, resulting in the unreliability of the existed furfural evaluation model. To elucidate the above problems, molecular dynamics simulation and furfural equilibrium experiments at 60°C were carried out at different moisture contents. The results show that high moisture content makes part of furfural diffuse from paper to oil indeed. Supposing moisture content increases from 1% to 2%, mass fraction of furfural in oil may increase from 32.98% to 49.83%, leading to furfural content in oil increases from 0.76 mg/L to 1.06 mg/L when the degree of polymerisation of insulation paper is about 524, which increased by 39.5%. The increase in moisture content makes cellulose form hydrogen bonds with H2O preferentially, decreasing the hydrogen bonds interaction between cellulose and furfural. Thus, partial furfural falls off cellulose and diffuses into oil, leading to an increase in furfural content in oil. To eliminate the moisture interference, a corrected furfural assessment model based on the moisture equilibrium curve has been constructed, which can accurately evaluate the ageing state of insulation paper regardless of the moisture influence.
- Published
- 2023
- Full Text
- View/download PDF
40. Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta‐aramid composite paper
- Author
-
Haoou Ruan, Qing Xie, Jingxuan Song, Shenghui Wang, Xiaobin Chang, Yuqin Xu, and Fangcheng Lü
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Organophilic groups of coupling agents can be the key factor for the electrical performance of Boron Nitride (BN)/meta‐aramid composite paper. In this article, four types of triethoxy‐silane coupling agents with different organophilic groups, including mercapto‐propyl (MP), glycidylether‐propyl (GP), amino‐propyl (AP) and trideca‐fluoro‐octyl (TFO) were studied. The structural and electrical properties of modified papers were compared, and the molecular simulation was conducted to reveal the interface interaction of modified BN and aramid. The results show that AP, GP and MP follow the same mechanism, improving the electrical performance by modifying the interface stability and paper structure, and the ranks of improving effects are AP, MP and GP. While, TFO mainly relies on the fluorine components to implement the electrical reinforcement, which compensates for the shortcoming in the paper structure. By choosing TFO and filler content of 15 wt%, the optimal breakdown strength of the paper can be increased to 28.17 kV/mm, 1.8 times that of the paper doped with the hydroxylated BN.
- Published
- 2023
- Full Text
- View/download PDF
41. Writing a massively multi‐authored paper: Overcoming barriers to meaningful authorship for all
- Author
-
Elizabeth T. Borer, Andrew S. MacDougall, Carly J. Stevens, Lauren L. Sullivan, Peter A. Wilfahrt, and Eric W. Seabloom
- Subjects
authorship accountability ,authorship transparency ,distributed experiment ,hyperauthorship ,inclusive authorship ,international collaboration ,Ecology ,QH540-549.5 ,Evolution ,QH359-425 - Abstract
Abstract The value of large‐scale collaborations for solving complex problems is widely recognized, but many barriers hinder meaningful authorship for all on the resulting multi‐author publications. Because many professional benefits arise from authorship, much of the literature on this topic has focused on cheating, conflict and effort documentation. However, approaches specifically recognizing and creatively overcoming barriers to meaningful authorship have received little attention. We have developed an inclusive authorship approach arising from 15 years of experience coordinating the publication of over 100 papers arising from a long‐term, international collaboration of hundreds of scientists. This method of sharing a paper initially as a storyboard with clear expectations, assignments and deadlines fosters communication and creates unambiguous opportunities for all authors to contribute intellectually. By documenting contributions through this multi‐step process, this approach ensures meaningful engagement by each author listed on a publication. The perception that co‐authors on large authorship publications have not meaningfully contributed underlies widespread institutional bias against multi‐authored papers, disincentivizing large collaborations despite their widely recognized value for advancing knowledge. Our approach identifies and overcomes key barriers to meaningful contributions, protecting the value of authorship even on massively multi‐authored publications.
- Published
- 2023
- Full Text
- View/download PDF
42. Gender analysis of the top classic papers in otolaryngology head and neck surgery
- Author
-
Beatrice Go, Neeraj Suresh, Cammille Go, Kevin Chorath, Natasha Mirza, Erica Thaler, Alvaro Moreira, and Karthik Rajasekaran
- Subjects
authorship ,bibliometrics ,citations ,gender ,otolaryngology ,publications ,Otorhinolaryngology ,RF1-547 ,Surgery ,RD1-811 - Abstract
Abstract Objective The aim of this study was to identify and analyze the gender breakdown of first authorship contributing to the most‐cited papers in the field of otolaryngology, with a goal of identifying trends in gender representation in publishing. Methods The top 150 most‐cited papers were identified using the Science Citation Index of the Institute for Scientific Information. Among the first authors, gender, h‐index, percentage of first, last, and corresponding authorship positions, total publications, and citations were analyzed. Results The majority of papers were in the English language, from the United States, of clinical nature, and on otologic topics. Eighty‐one percent of papers (n = 122) had men who were first authors, although there was no difference in h‐index score, authorship position, number of publications, citations, and average citations/year between men and women first authors. Upon subgroup analysis by decade (1950s–2010s), there was no difference in the number of articles by women first authors (P = 0.11); however, there was a statistically significant increase in the percentage of women authors (P = 0.001) in papers published later compared to those published earlier. Conclusions While a promising number of women otolaryngologists are publishing high‐powered articles, future initiatives to promote academic inclusivity of women should be considered.
- Published
- 2023
- Full Text
- View/download PDF
43. Preparation and thermal‐mechanical property evaluation of cellulose insulation paper with differing nano‐SiC contents
- Author
-
Yiyi Zhang, Chuqi Xu, Wenchang Wei, Yuke Deng, Shuangxi Nie, and Junwei Zha
- Subjects
Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract Cellulose insulation paper is the main component of oil‐paper insulation systems in oil‐immersed transformers. However, the poor thermal conductivity and thermal stability of the cellulose can lead to thermal ageing. It is critical to address this issue by improving the performance of cellulose, nano‐SiC‐modified cellulose models were established by molecular simulation, while nano‐SiC composite papersheets were prepared based on the simulation results, and the effects of different contents of nano‐SiC on the papersheets were investigated. Macroscopically, doping nano‐SiC particles can enhance the thermal stability of cellulose; compared with the unmodified papersheet, the thermal conductivity and tensile strength of the modified papersheets are increased by 44.3% and 42.8%, respectively. The degree of polymerisation of the modified papersheet decreased more slowly than that of the unmodified papersheet under accelerated thermal ageing, showing that the modified papersheet has better anti‐ageing properties. Microscopically, with the addition of nano‐SiC, the simulations showed that the mean square displacement of the cellulose decreases dramatically and the distribution of the free volume becomes difficult to disperse, which corresponds to the decrease in porosity in the experiments. As a result, this research provides a way for improving the thermal‐mechanical properties of cellulose that has practical application significance.
- Published
- 2023
- Full Text
- View/download PDF
44. Streptomyces spp. as biocatalyst sources in pulp and paper and textile industries: Biodegradation, bioconversion and valorization of waste
- Author
-
Mara F. Cuebas‐Irizarry and Amy M. Grunden
- Subjects
Biotechnology ,TP248.13-248.65 - Abstract
Abstract Complex polymers represent a challenge for remediating environmental pollution and an opportunity for microbial‐catalysed conversion to generate valorized chemicals. Members of the genus Streptomyces are of interest because of their potential use in biotechnological applications. Their versatility makes them excellent sources of biocatalysts for environmentally responsible bioconversion, as they have a broad substrate range and are active over a wide range of pH and temperature. Most Streptomyces studies have focused on the isolation of strains, recombinant work and enzyme characterization for evaluating their potential for biotechnological application. This review discusses reports of Streptomyces‐based technologies for use in the textile and pulp‐milling industry and describes the challenges and recent advances aimed at achieving better biodegradation methods featuring these microbial catalysts. The principal points to be discussed are (1) Streptomyces' enzymes for use in dye decolorization and lignocellulosic biodegradation, (2) biotechnological processes for textile and pulp and paper waste treatment and (3) challenges and advances for textile and pulp and paper effluent treatment.
- Published
- 2024
- Full Text
- View/download PDF
45. Direct Ink Writing of Nanocellulose and PEDOT:PSS for Flexible Electronic Patterned and Supercapacitor Papers
- Author
-
Lay, Makara, Say, Mehmet Girayhan, Engquist, Isak, Lay, Makara, Say, Mehmet Girayhan, and Engquist, Isak
- Abstract
Printed electronic paper identifies its interest in flexible organic electronics and sustainable and clean energy applications because of its straightforward production method, cost-effectiveness, and positive environmental impact. However, current limitations include restricted material thickness and the use of supporting substrate for printing. Here, 2D and 3D electronic patterned paper are fabricated from direct ink writing (DIW) nanocellulose and PEDOT:PSS-based materials using syringe deposition and 3D printing. The conductor patterns are integrated in the bulk of the paper, while non-conductive sections are used as support to form free-standing paper. The strong interface between the patterns of electronic patterned paper gives mechanical stability for practical handling. The conductive paper-based electrode has 202 S cm(-1) and is capable of handling electric current up to 0.7 A, which can be used for high-power devices. Printed supercapacitor papers show high specific energy of 4.05 Wh kg(-1), specific power of 4615 W kg(-1) at 0.06 A g(-1), and capacitance retention above 95% after 2000 cycles. The new design structure of electronic patterned papers presents a solution for additive manufacturing of paper-based composites for supercapacitors, wearable electronics, or sensors for smart packaging.
- Published
- 2023
- Full Text
- View/download PDF
46. Is There a Difference between Paper and Electronic Chinese Signatures?
- Author
-
Ji-Feng Luo, Yun-Zhu Pu, Jie-Yang Yin, Xiaohong Liu, Tao Tan, Yudong Zhang, and Menghan Hu
- Subjects
Bézier curve ,cross-media analysis ,neural networks ,signature authentication ,Computer engineering. Computer hardware ,TK7885-7895 ,Control engineering systems. Automatic machinery (General) ,TJ212-225 - Abstract
The purpose of this study is to investigate whether there are differences in handwritten Chinese signatures on different media including paper and electronic devices. Participants were asked to sign specified names on various types of media and the signatures were scanned or saved digitally for subsequent analysis. In this study, using convolutional neural networks and Siamese neural networks as classifiers and comparators, the performance plunge is revealed and thus considerable dissimilarity between the signatures on different media is implied. To further explore this, cubic Bézier curves are fitted to the signatures using the least square method for quantitative statistical analysis. By analyzing the visual changes in the morphology of strokes, several features of signatures are selected and computed, and the paired t‐test and the Wilcoxon signed‐rank test are implemented, which provides a deeper substantiation and explanation of the findings.
- Published
- 2023
- Full Text
- View/download PDF
47. Ageing characteristics and lifetime model of oil–paper insulation for oil‐immersed paper condenser bushing
- Author
-
Sihang Gao, Lijun Yang, and Tingjing Ke
- Subjects
ageing ,bushings ,capacitors ,insulating oils ,paper ,polymerisation ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract This study extensively investigated the ageing characteristics and lifetime model of oil–paper insulation for oil‐immersed paper condenser bushing. The accelerated thermal and electrothermal ageing experiments of oil‐immersed paper condenser bushing were conducted respectively. The properties of oil–paper insulation during the ageing process were investigated. Results showed that descending speed of degree of polymerization of the innermost and the outermost layer paper was higher than that of middle layer paper, the difference in water content on different paper layers caused varying deterioration speeds. The aluminium foil contributed to a surge in aluminium dissolution in oil, further accelerating the ageing of insulation. Based on the obtained degree of polymerization data under thermal ageing at 90°C, 100°C and 130°C, the lifetime model of oil–paper insulation for condenser bushing model was established. In addition, the surface breakdown of the scale model of bushing occurred after 133 days ageing, the properties of bushing decreased gradually during the ageing process and sharply after the breakdown. Degree of polymerization deviation of different paper layers in bushing between calculated value according to the above lifetime model and actual value of bushing after the breakdown was less than 6%, further verifying the validity of lifetime model.
- Published
- 2021
- Full Text
- View/download PDF
48. A review on a novel method for aging evaluation of transformer insulating paper based on methanol
- Author
-
Qingguo Chen, Wei Sun, Song Cheng, and Guokai Huang
- Subjects
ageing ,chemical analysis ,chromatography ,condition monitoring ,prediction theory ,transformers ,Distribution or transmission of electric power ,TK3001-3521 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract The insulation paper is a crucial factor for evaluating the insulation status of transformers. The traditional evaluation methods for insulation paper are dissolved gas component content analysis (CO and CO2) and furfural (2‐FAL) content analysis in oil. The detection principle of the former leads to its low accuracy, while the field application effect of the latter is not ideal due to the easy oxidation of furfural and low content. Methanol, result of its good stability and high production compared with other marker products (CO, CO2, 2‐FAL) has been investigated as a novel marker for aging evaluation of transformer insulating paper in recent years. The results of the investigation indicated that there is a good correlation between the content of methanol in oil and the degree of polymerization under laboratory conditions, which reflected the insulation aging state of the transformer insulating paper more accurately. This paper summarizes the current research status of methanol formation mechanism, detection methods and aging evaluation in insulating oil, and points out the key problems to be solved and development prospects, hoping to provide relevant reference for aging evaluation of oil immersed power transformer.
- Published
- 2023
- Full Text
- View/download PDF
49. Papers from the 17th Joint Workshop on Augmented Environments for Computer Assisted Interventions at MICCAI 2023: Guest Editors’ Foreword
- Author
-
Cristian A. Linte, Ziv Yaniv, Elvis Chen, Qi Dou, Simon Drouin, Megha Kalia, Marta Kersten‐Oertel, Jonathan McLeod, and Duygu Sarikaya
- Subjects
Medical technology ,R855-855.5 - Published
- 2024
- Full Text
- View/download PDF
50. Analysis of low‐frequency polarisation behaviour for oil‐paper insulation using logarithmic‐derivative spectroscopy
- Author
-
Jiefeng Liu, Xianhao Fan, Yiyi Zhang, Benhui Lai, and Jian Jiao
- Subjects
paper ,power transformer insulation ,transformer oil ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
Abstract The low‐frequency polarisation information of oil‐paper insulation could be easily obscured by the conductance effect, and the contained polarisation information thus can not be readily extracted from the frequency domain spectroscopy (FDS). Given this issue, an alternative idea is reported to extract the low‐frequency polarisation information by using logarithmic‐derivative spectroscopy (LDS). The present findings proved that the parameters extracted by using the LDS can be applied for studying the low‐frequency polarisation behaviour under the moisture effect. In that respect, the novelty of this work is in the exploration of the LDS as a potential tool to extract feature parameters for analyzing the low‐frequency polarisation information of transformer oil‐paper insulation.
- Published
- 2021
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.