1,608 results on '"Modified"'
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2. Novel method of fabricating lightweight thermally insulation fibrous composites for energy saving.
- Author
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Qiu, Danyang, Li, Shujing, Li, Yuanbing, Cai, Zhen, Fu, Chengzhen, and Wei, ChangDong
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FIBROUS composites , *SILICA fibers , *REFRACTORY materials , *THERMAL conductivity , *ENERGY conservation , *THERMAL insulation - Abstract
Fiberboard (FB) is extensively utilized in heat‐insulating refractory materials owing to its lightweight nature and excellent resistance to high temperatures. Nevertheless, the inadequate mechanical properties and limited dimensional stability of FB hinder its further application. The vacuum filtration was utilized in this study to manufacture inorganically modified insulation FB, incorporating plus fiber/1260 fiber and silica sol as the primary constituents and sepiolite powder (HS) as the modifier. The experimental results show that the fabricated samples exhibited extremely high porosity (75.3%–90.2%) and low thermal conductivity (.063–.15 W m−1 K−1, 200–800°C). The fibers were arranged in a three‐dimensional structure, overlapping with each other, and the silica sol adhered to the fibers, forming a spatial mesh structure through cross‐linking. Importantly, the incorporation of HS was effective in controlling the agglomeration of the silica sol, leading to a more uniform distribution within the fibers. Additionally, the study found that the mechanical properties (high hardness (64–72 HA)) and high‐temperature durability of the FBs were enhanced due to the flocculant modification. This study highlights promising prospects for industrial applications and offers a cost‐effective admixture for modifying and preparing high‐performance FBs, which is expected to see broad adoption in thermal insulation and energy conservation applications. [ABSTRACT FROM AUTHOR]
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- 2024
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3. 碱熔融复合改性钢渣处理铅离子废水的试验研究.
- Author
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张西玲, 陈丽芳, 廖江萍, 宋丽婷, 熊 佳, and 甄聪聪
- Abstract
Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2024
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4. 磷石膏的疏水改性研究现状及进展.
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李远霞, 曾芳芳, 杨珖, 李燚, 陈忠华, 何松涛, and 刘其斌
- Abstract
Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
5. Performance of ball-milling-modified coal gangue on Pb2+, Zn2+, and NH4+–N adsorption.
- Author
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Zhang, Hualin, Jiang, Xiaoliang, Zhao, Mengfei, Ma, Xingyu, Yang, Youming, and Li, Tinggang
- Abstract
As the numerous industrial solid waste, coal gangue caused serious environmental pollution in China, while the it could be modified and reused as an effective adsorption material in environmental remediation. In the current study, the coal gangue was modified by environmentally friendly ball-milling chemical modification method and used for simultaneous adsorption heavy metal and ammonia in wastewater. Both the initial and modified coal gangue were characterized for structure and composition. Optimization of ball-milling conditions and adsorption parameters was carried out, followed by thermodynamic and kinetic experiments under the defined conditions. The results showed that the adsorption of Pb
2+ , Zn2+ , and NH4 + –N accorded with the quasi-second-order kinetic model, with all adsorption isotherms conforming to the Langmuir model. Thermodynamic analysis indicates that the adsorption of Pb2+ , Zn2+ , and NH4 + –N is an exothermic process, and the adsorption reaction can occur independently. Moreover, modified coal gangue exhibited sufficient adsorption sites for the combination of Pb2+ , Zn2+ , and NH4 + –N at low concentrations in adsorption competition experiment, with an adsorption sequence like Pb2+ > Zn2+ > NH4 + –N. Our results provide that ball-milling-modified coal gangue can be used as a helpful adsorption material for heavy metal ions and ammonia removal in wastewater treatment. [ABSTRACT FROM AUTHOR]- Published
- 2024
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6. The seroprevalence of Toxoplasma gondii infection among horses in Northwest Iran.
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Jafari-Khataylou, Yaser, Imani-Baran, Abbas, and Akbari, Hamid
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AGGLUTINATION tests ,TOXOPLASMA gondii ,DOMESTIC animals ,TOXOPLASMOSIS ,CHI-squared test - Abstract
Toxoplasmosis is an important health concern for people and farm animals, leading to many studies on its effects on these populations. Despite this, there is a lack of research on the prevalence of Toxoplasma gondii infection among horses in Iran. This study aims to determine the seroprevalence of toxoplasmosis using the Modified Agglutination Test (MAT) in northwest Iran horses. In this study, blood samples were taken from 385 horses in Ardabil, East Azerbaijan, and West Azerbaijan provinces. Data regarding the age, gender, and location of each horse was documented to assess their impact on the prevalence of toxoplasmosis. The data was analyzed using the chi-square test, with a significance level of p < 0.05. Of the 385 samples, 34 (8.8%) were positive for Toxoplasma gondii. Among the 271 male and 114 female horses, 24 (8.9%) and 10 (8.8%) were seropositive, respectively. Of the 116 horses under and 269 over five years old, 15 (12.9%) and 19 (7.1%) were seropositive, respectively. The prevalence rates in Ardabil, East Azerbaijan, and West Azerbaijan were 11.7% (18 out of 154), 5.1% (7 out of 136), and 9.5% (9 out of 95), respectively. According to the statistical analysis, there were no significant differences in the prevalence of Toxoplasma gondii infection based on age, gender, or sampling location. This study is the first extensive report on the toxoplasmosis seroprevalence among horses in northwest Iran. The results provide important information that can help control and prevent the spread of toxoplasmosis. [ABSTRACT FROM AUTHOR]
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- 2024
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7. Experimental study on treatment of Pb ion wastewater by alkali fusion modified steel slag
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ZHANG Xiling, CHEN Lifang, LIAO Jiangping, SONG Liting, XIONG Jia, and ZHEN Congcong
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steel slag ,modified ,removal ,lead ion ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
A modified steel slag adsorbent was prepared with composite modifier(NaOH or Al(OH)3+fly ash) at high temperature. The effects of alkali melting temperature, alkali melting time and alkali doping on the adsorption performance of Pb(Ⅱ) was investigated. Chemical composition, mineral composition, microstructure and pore size was analyzed with XRF, XRD, SEM, BET and other methods. The heavy metal leaching toxicity, regeneration ability and selectivity of the modified steel slag prepared under the optimal conditions were investigated. The results showed that the best adsorption of Pb(Ⅱ) was achieved under the conditions of 700 ℃ alkali melting temperature, 4 h alkali melting time and 100∶10∶20 mass ratio of steel slag, fly ash and Al(OH)3. There was not new crystal in the modified steel slag, but the original crystal structure was destroyed, and porous aluminum silicate salt with certain activity was formed. Loose fine molten particles were accumulated on the surface of steel slag, and pore size was concentrated in the range of 5-20 nm. Under the combined effect of pore adsorption, chemical precipitation and ion exchange, the removal rate of Pb(Ⅱ) from wastewater reached 98.15%. The modified steel slag adsorbent had better regeneration and selectivity, which was a green and safe heavy metal ion adsorbent.
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- 2024
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8. Physicochemical Properties of Modified Walur Starch Flour (Amorphopallus campanullatus) from Autoclaving-cooling Process
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Rosida, Rosida, Alima, Aziza Nur, Ma, Wanshu, Series Editor, Wafa, Ali, editor, Rondhi, Mohammad, editor, Witono, Yuli, editor, Mori, Yosuhiro, editor, and Ogita, Shinjiro, editor
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- 2024
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9. Experimental Study on LaFeO3/Nb2O5 Oxygen Carrier in Chemical-Looping Partial Oxidation of Methane
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Lai, Yue, Zheng, Songming, Duan, Huamei, Long, Mujun, Chen, Dengfu, Li, Yandong, Zhang, Guoquan, and The Minerals, Metals & Materials Society
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- 2024
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10. Revisiting Elliot's Modification of Moberg's Flap and Our Improvisation
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Anand Prasath Jayachandiran, Suresh Rajendran, Surya Rao Rao Venkata Mahipathy, Alagar Raja Durairaj, Narayanamurthy Sundaramurthy, and Manoj Ananthappan
- Subjects
Elliot's flap ,modified ,daughter flap ,Surgery ,RD1-811 - Abstract
Thumb tip injuries constitute one of the most common hand injuries. There are various reconstructive options for thumb tip injuries. We present our series of thumb tip injuries reconstructed using Elliot's modification of the Moberg flap, which provides like-for-like tissue. We also present our flap improvisation, which can be useful in the armamentarium of plastic surgeons.
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- 2024
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11. Fe‐La‐Ce‐ZSM‐5 Zeolite for Adsorbing Congo Red.
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Yang, Jie, Cai, Zhengkun, and Li, Dong
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CONGO red (Staining dye) , *MOLECULAR sieves , *ZEOLITES , *SCANNING electron microscopy , *HYDROTHERMAL synthesis , *ADSORPTION capacity - Abstract
In this experiment, ZSM‐5 molecular sieves are prepared by hydrothermal synthesis and modified by impregnation with Fe, La, and Ce loading. X‐ray diffraction, X‐ray photon‐electron spectroscopy, and scanning electron microscopy show that Fe, La, and Ce elements are successfully loaded onto the surface of the material, and the surface area of Fe‐La‐Ce‐ZSM‐5 is 241.66 m2 g−1. A systematic study on the adsorption of Congo red solution is carried out using Fe‐La‐Ce‐ZSM‐5 molecular sieves and it is found through the adsorption data that the adsorption process is more in line with Langmuir and the proposed second‐order kinetic model, and the theoretical saturated adsorption capacity is 2669.19 mg g−1. The adsorption process is recycled four times and still has more than 60 % removal performance for high‐concentration Congo red solution. The results of this experiment show that Fe‐La‐Ce‐ZSM‐5 molecular sieves show excellent removal performance for Congo red dye in wastewater. [ABSTRACT FROM AUTHOR]
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- 2024
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12. Tribological properties of Cetyltrimethyl ammonium bromide modified CS as lubrication additive.
- Author
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Li, Jing, Liu, Tianxia, and Liu, Jinyu
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CETYLTRIMETHYLAMMONIUM bromide , *SOOT , *MECHANICAL wear , *GRAPHITE , *CARBON films , *GRAPHITIZATION , *LUBRICANT additives , *AMORPHOUS carbon - Abstract
The coal indirect liquefied diesel soot (Coal‐to‐liquids diesel soot, CS) was collected by a self‐made soot trapper. CS was modified with cetyltrimethyl ammonium bromide (CTAB) and named as CS‐CTAB. The tribological properties of CS and CS‐CTAB in 10#white oil(10#WO) were tested on a WTM‐2E controlled atmosphere miniature friction and wear testing machine. The morphology, composition, and tribological mechanism of CS and modified CS‐CTAB were studied by using TEM, XPS, XRD, Raman, and other instruments. The results showed that CS modified by CTAB is wrapped and entangled in long chains. Their main structure components are all amorphous carbon with a small amount of graphite crystallites. The addition of CS‐CTAB (0.8 wt%) significantly reduces both AFC and wear rate, with reductions of 32.9% for AFC, and 65.6% for wear rate compared to no additive. The anti‐friction and anti‐wear effect of CS is greatly improved after being modified by CTAB. Mechanism analysis shows that CS as a lubricant additive, acts as a micro‐bearing in the friction process and falls off under the action of shear force to generate an independent graphite sheet, thus forming a graphite protective film on the surface of 304 stainless steel plate. However, CS has the defects of low graphitization degree, large particle size, and easy agglomeration. During friction, uneven adsorption of CS on the surface can worsen wear. However, CTAB modification can improve dispersion stability in 10#WO and effectively reduce wear on the friction surface. [ABSTRACT FROM AUTHOR]
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- 2024
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13. 用于低温NH3-SCR的MOFs衍生物催化剂研究进展.
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李世民, 鲁津源, 李思盈, 郭强, 李传强, and 郑旭煦
- Abstract
The application of metal-organic matrix materials (MOFs) and their derivatives in low temperature NH3-SCR was reviewed. The effects of pyrolysis temperature and pyrolysis atmosphere on the morphology, specific surface area and crystallinity of MOFs derivatives, as well as the modifieation methods of MOFs materials and derivatives catalysts were discussed. The deficiency of MOFs and its derivative catalysts and the future research direction are also pointed out. [ABSTRACT FROM AUTHOR]
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- 2024
14. 镯系钙钛矿活化过硫酸盐的研究进展.
- Author
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董雯, 胡程杰, 黄仕元, 打袁瀚, 吴兴良, and 王国华
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The structural characteristics of LaBO3, the influence of synthesis methods on 让s physical and chemical properties, and the mechanism of LaBO3 activation of PS are presented・ The research progress of LaBO3 modified by A/B site ion doping, metal oxide loading and carbobased material loading in recent years is reviewed, and the future research direction of LaBO3/PS system for organic pollutant degradation is prospected・ It is suggested that: the structural stability of modified LaBO3 should be further improved, and the pollutant effect of metal ion leaching should be investigated・ The effect of ion co-doping modification on the catalytic performance of LaBO3 is further investigated・ The degradation mechanism of organic pollutants in the LaBO3/PS system will be studied in detail. [ABSTRACT FROM AUTHOR]
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- 2024
15. Revisiting Elliot's Modification of Moberg's Flap and Our Improvisation.
- Author
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Jayachandiran, Anand Prasath, Rajendran, Suresh, Mahipathy, Surya Rao Rao Venkata, Durairaj, Alagar Raja, Sundaramurthy, Narayanamurthy, and Ananthappan, Manoj
- Subjects
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HYPERTROPHIC scars , *PLASTIC surgeons , *RANGE of motion of joints , *SKIN grafting , *JOINT diseases , *HAND injuries - Abstract
Thumb tip injuries constitute one of the most common hand injuries. There are various reconstructive options for thumb tip injuries. We present our series of thumb tip injuries reconstructed using Elliot's modification of the Moberg flap, which provides like-for-like tissue. We also present our flap improvisation, which can be useful in the armamentarium of plastic surgeons. Background Moberg described the advancement flap for thumb defects in 1964, which was modified by O'Brien in which the proximal part of the flap is incised and advanced. Although it is a popular flap, it has the disadvantage of interphalangeal (IP) joint flexion deformity. Among the various modifications of the Moberg flap, Elliot's flap provided more tissue with minimal donor site morbidity and no usage of skin grafts or first web skin. Methods We retrospectively analyzed the patients who underwent reconstruction of thumb defects by Elliot's modified Moberg's flap. The size of the defect, etiology, and IP joint movement were analyzed. Two patients underwent our improvised flap where a daughter flap was elevated within Elliot's flap. Results Between January 2021 and September 2023, 12 patients underwent reconstruction by Elliot's flap. All flaps settled well. There was no IP joint deformity. Two patients had scar hypertrophy that was managed conservatively. Conclusion Elliot's modification of the Moberg flap is a very useful but underutilized flap for thumb tip injuries that provides like tissue with sensation and with little donor site morbidity. It can be used for thumb tip defects of up to 3 cm. It is possible to incorporate a second V-Y flap in patients for whom additional movement is required for tension-free closure. [ABSTRACT FROM AUTHOR]
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- 2024
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16. 污泥陶粒的功能化改性及含磷废水处理研究.
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郝禅光, 李春立, 李 权, 邢丽静, 梁 欢, and 徐 峥
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With the rapid development of urban scale, the amount of municipal sewage treatment increases sharply, which leads to the disposal of sludge solid waste. The porous ceramsites (SC) were prepared with sludge as the main raw material and fly ash and montmorillonite as the auxiliary materials, and functionalized by co-precipitation method to obtain lanthanum modified sludge ceramsites (L-SC) and iron lanthanum modified sludge ceramsites (LF-SC). The pH, dosage and interference anion were the experimental factors to investigate the adsorption performance of phosphorus in simulated wastewater containing phosphorus, and the adsorption mechanism was discussed through analysis and characterization. The results showed that L-SC and LF-SC have dense pore structures with SBET of 17148.7 cm²/g and 17439.2 cm²/g, respectively. The adsorption performance of the modified ceramsite was significantly better than that of SC, and the phosphorus removal rate of L-SC was up to 93.74% at pH=5. However, the phosphorus removal rate of LF-SC is higher and the adsorption effect is less affected by pH, and the phosphorus removal rate is above 97% when 5≤pH≤9. Pseudo-second-order kinetic model and Freundlich model can better describe the adsorption of phosphorus by modified ceramsites. The results of FTIR and SEM-EDS showed that transition metal Fe had obvious activation effect on rare earth metal La, which greatly improved the adsorption performance of the ceramsites. The main mechanism of phosphate adsorption was electrostatic attraction and ligand exchange to form stable complexes. [ABSTRACT FROM AUTHOR]
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- 2024
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17. Fe3O4 磁性纳米颗粒的修饰及在肿瘤治疗中的应用.
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刘锦博, 王倩男, and 张静
- Abstract
The functionalized Fe3O4-MNPs and their application in tumor therapy are reviewed. The modification of Fe3O4-MNPs by inorganic nanoparticles and organic polymers in order to enhance the stability, dispersibility and biocompatibility of magnetic nanomaterials is highlighted. And the application of Fe3O4-MNPs in treatment as drug carrier, magnetic hyperthermia, magnetic resonance imaging, photodynamic therapy. The possible problems in the application of Fe3O4-MNPs are discussed and the future development is prospected. It is pointed out that the size, shape and dose of Fe3O4-MNPs will be the primary indicators of evaluation, and the cytotoxicity problems in therapeutic applications may become a key challenge. The synthesis of multifunctional, low cost and convenient application of Fe3O4-MNPs by seeking new modified materials is the main research focus in the future. [ABSTRACT FROM AUTHOR]
- Published
- 2024
18. Preparation of Modified UiO-66 Catalyst and Its Catalytic Performance for NH3-SCR Denitration.
- Author
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Wu, Yanxia, Liang, Hailong, Chen, Yufeng, Hu, Liming, and Wang, Chunpeng
- Abstract
Zirconium-based metal-organic framework UiO-66 was successfully prepared by solvothermal method, and UiO-66 was modified by adding regulators such as formic acid, acetic acid, and hydrochloric acid. The NH
3 -SCR reactivity of the samples was evaluated by the denitration activity evaluation system, and the UiO-66 and the regulator-modified UiO-66 were characterized by XRD, SEM, BET, FTIR, TG, NH3 -TPD, etc., the effects of regulator types on the structure and properties of UiO-66 were investigated. The experimental results show that, after adding the modifier, the morphology of UiO-66 changes from irregular quadrilateral with serious agglomeration to particles with regular crystal shape and good dispersibility, and the crystal morphology of the catalyst is improved. In addition, after adding the modifier, UiO-66 has a larger specific surface area and stronger surface acidity, which optimizes the catalytic performance of UiO-66. The catalytic performance test results of NH3 -SCR show that the low-temperature activity of UiO-66 is poor, and it only shows a certain catalytic activity at higher temperatures. The catalytic activity of UiO-66 was significantly improved after adding the regulator. Among them, the UiO-66-HCl modified with hydrochloric acid had the best catalytic activity, and the denitration rate reached 70% when the denitration temperature was 380 °C. [ABSTRACT FROM AUTHOR]- Published
- 2024
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19. Cadmium removal efficiency from synthetic wastewater using sawdust as a sustainable adsorbent.
- Author
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M., Lahieb Faisal, Sachit, Dawood Eisa, and M., Farah Faisal
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WOOD waste ,LANGMUIR isotherms ,CADMIUM ,SEWAGE ,ADSORPTION isotherms ,HYDROXYL group - Abstract
Adsorption is one of the method that can be used to remove heavy metals from polluted water. Many adsorbents are naturally available and showed high performance in removing various pollutants. This study aimed to evaluate the performance of sawdust as a natural adsorbent agent to remove Cd ions from simulated wastewater and, also, to assess the improvement of sawdust adsorption capacity after activation by sulfuric acid (H
2 SO4 ). Many factors such as pH, contact time, temperature, and weight of the adsorbent were investigated in this study to evaluate their effect on the adsorption process. The results indicated a significant improvement of sawdust after modification (95.51% removal) compared to raw sawdust (82.22% removal). Equilibrium adsorption isotherms and kinetic study have been also carried out. Compared to the Langmuir adsorption isotherm model, the Freundlich isotherm model was best represented the experimental data of the sawdust. The experimental results of this sorbent were suitable for a pseudo-second order kinetic model. Moreover, the result pointed out that the process of adsorption was an endothermic and increasing the temperature resulted in a higher removal rate. Additionally, FTIR results revealed that the groups of carboxyl and hydroxyl contributed to the metal ions' ability to bind to surfaces. Finally, images of the surface structure of the sawdust before and after modification were obtained by using scanning electron microscopy (SEM) to analyze the surface morphology of both raw and treated sawdust. [ABSTRACT FROM AUTHOR]- Published
- 2024
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20. Strength Properties of Asphalt Mixture Produced with Polyvinyl Chloride (PVC) Modified Bitumen
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A. A. Murana, Y. D. Amartey, L. I. Abah, K. E. Ibedu, and J. N. Bitrus
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Bitumen ,hot mix asphalt ,modified ,polyvinyl chloride ,pavement materials ,strength properties ,Technology - Abstract
In recent time, more polyvinyl chloride (PVC) plastic are produced than what is currently being recycled, that contributes to the volume of waste. This occurrence prompted the exploration of polymer modified bitumen (PMB) to address the waste concern and thereby cuts cost in bituminous mix and improves pavement performance. This research evaluated the strength properties of asphalt mixture produced with polyvinyl chloride modified bitumen. Marshall method of mix design was used in the production of hot mix asphalt (HMA). Scanning Electron Microscopy (SEM), Fourier Transform Infra-red (FTIR) and Energy Dispersive X-Ray Spectrometry (EDS), used for microstructural examination and elemental analysis. These materials conform with its physical properties and characteristics. The shredded, grinded plastic revealed high binding properties when blend with bitumen. The percent incorporated was 2 - 10% PVC content and the Optimum Bitumen Content obtained was 10%, at 9.57kN for stability. The modified bitumen for penetration recorded at 68mm, which conformed with 60/70 grade bitumen, softening point recorded at 52oC, ductility was recorded at 107cm, specific gravity at 1.02, flash and fire point at 294oC and 306oC, solubility at 97% respectively. The properties were satisfactorily for grade 60/70 bitumen at 4% PVC by weight and be used as bitumen modifier for heavy traffic condition. Polyvinyl Chloride modified at 8 - 10%, be used at cold climates, while 2, 4, 6% PVC modified be used in warm regions. Therefore, the experiment proved these materials with characteristics, stability and stiffness be used for pavement constructions.
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- 2024
21. Performance of ball-milling-modified coal gangue on Pb2+, Zn2+, and NH4+–N adsorption
- Author
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Zhang, Hualin, Jiang, Xiaoliang, Zhao, Mengfei, Ma, Xingyu, Yang, Youming, and Li, Tinggang
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- 2024
- Full Text
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22. Study on Desulfurization Performance of FeCl3 Modified Activated Carbon
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Qian HU, Ran LIU, Jun ZHAO, and Qing LYU
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environmental engineering ,activated carbon ,modified ,desulfurization ,impregnation method ,Mining engineering. Metallurgy ,TN1-997 - Abstract
This is an essay in the field of environmental engineering. The experiment adopts the impregnation method, and uses FeCl3 as the modifier to modify the activated carbon to study its desulfurization ability. The effects of modifier concentration, roasting temperature, and reaction temperature on the desulfurization performance of modified activated carbon were experimentally studied. Studies have shown that as the concentration of the modified solution increases, the Fe2O3 attached to the surface of the activated carbon increases, the specific surface area and total pore volume of the modified activated carbon decrease, and the average pore size increases; as the roasting temperature increases, the amount of Fe2O3 attached to the surface of the activated carbon continues. When the roasting temperature exceeds 300 ℃, the pore structure of the activated carbon surface will be sintered, which will reduce the desulfurization performance of the modified activated carbon; as the reaction temperature increases, the adsorption performance of FeCl3/AC-0.15 first increases and then decreases. When the concentration of FeCl3 modified solution is 0.15 mol/L, the calcination temperature is 300 ℃, and the reaction temperature is 60 ℃, the desulfurization efficiency of modified activated carbon is the highest.
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- 2024
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23. Predictive Value of the Modified Mehran Score for Contrast-Induced Nephropathy After Transcatheter Aortic Valve Implantation.
- Author
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Özdemir, Emre, Akçay, Filiz Akyıldız, Esen, Saban, Emren, Sadık Volkan, Karaca, Mustafa, Nazlı, Cem, and Kırış, Tuncay
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KIDNEY disease risk factors , *C-reactive protein , *PREDICTIVE tests , *HEART valve prosthesis implantation , *CONFIDENCE intervals , *PREOPERATIVE period , *CONTRAST media , *SURGICAL complications , *KIDNEY diseases , *RISK assessment , *DESCRIPTIVE statistics , *SENSITIVITY & specificity (Statistics) - Abstract
Considering the increasing use of the transcatheter aortic valve implantation (TAVI) procedure, the relationship of contrast-induced nephropathy (CIN) with post-TAVI mortality has become important. The Mehran score was developed to detect the risk of CIN development after cardiac intervention. We aimed to compare the role of the modified Mehran score, which can be calculated pre-procedure, in predicting CIN development and compare it with the original Mehran score. We retrospectively collected data from TAVI procedures at our institution between December 2016 and June 2021; of 171 patients, 44 (25.7%) had CIN. We found no association between contrast media volume and CIN (387 ± 120 vs 418 ± 139 mL, P =.303). High and very high modified Mehran score and preoperative C-reactive protein (CRP) level were independent risk factors for CIN development after TAVI procedure. The area under curve (AUC) was.686 with 95% CI:.591-.780 and P <.001, and also, with a cut-off point of >7.5 points, there was 79.5% sensitivity and 63.0% specificity; otherwise, with a cut-off point of >9.5 points, there was 54.5% sensitivity and 71.7% specificity, for the modified Mehran score. The modified Mehran score comes into prominence compared with the original Mehran score since it can be calculated pre-procedure. [ABSTRACT FROM AUTHOR]
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- 2024
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24. The properties of a new fog seal material made from emulsified asphalt modified by composite agents.
- Author
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Cai, Yingchun, Yun, Shenshen, and Liu, Heng
- Abstract
New fog seal material has been developed using emulsified asphalt (EA) modified by composite agents including waterborne epoxy resin (WER), waterborne polyurethane (WPU), waterborne acrylic resin (WAR) or cement, to address the shortcomings of conventional fog seal material in terms of poor durability and adhesion. Test results showed that the new material was uniformly dispersed and stable to store, with improved pullout strength by 2-4 times, a water permeability coefficient close to zero and slight reduction in British Pendulum Number when comparing the fog seal with or without fine sand. The suggested composition is between 50-70% cationic EA, 15-25% WER, 10-20% WPU and 0-5% WAR, with a spraying amount of 0.6-0.7 kg/m2 along with a ratio of 100 modified emulsions, 8 cement, and 25-40 sand. This modified emulsion can easily be sprayed as fog seal material with or without sand. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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25. Preparation of a High‐Performance Anti‐Aging Polypropylene Composite with Titanium Oxide and Calcium Sulfate Shielding Agents.
- Author
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Cong, Shanshan, Lan, Tianyu, Wang, Yazhen, Zu, Liwu, Dong, Shaobo, and Zhan, Zuoyuan
- Subjects
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TITANIUM oxides , *TITANIUM composites , *CALCIUM sulfate , *LIME (Minerals) , *CRYSTAL whiskers , *POLYPROPYLENE - Abstract
Polypropylene is a thermoplastic synthetic resin that is widely used across industries. However, it tends to fracture easily and get oxidized under ultraviolet light and high temperatures. This not only reduces its service life but also causes pollution and waste. Although the use of TiO2 as a shielding agent has improved the aging performance of PP composite materials, it still has poor mechanical and processing properties that do not meet the actual demand for high‐performance polypropylene.This limitation seriously impacts the development of polypropylene products. In this paper, we propose the use of the ATRP method with UV shielding titanium dioxide (TiO2) and high‐toughness calcium sulfate whiskers (CSW) coated with coupling agent KH570 surface modification after grafting acrylonitrile (AN). This material has a dual shielding effect on UV light. TiO2‐PAN (TP) mainly plays the role of anti‐aging, whereas CSW‐PAN(CP) mainly enhances the compatibility and mechanical strength between TP and CP. Additionally, CP has a certain UV shielding function due to grafting acrylonitrile. When added to PP in a certain proportion, TP and CP work together to improve the overall performance of polypropylene. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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26. RELATIONSHIP BETWEEN SHOCK INDEX, MODIFIED SHOCK INDEX, AND AGE SHOCK INDEX AND 28-DAY MORTALITY AMONG PATIENTS WITH PREHOSPITAL SEPTIC SHOCK.
- Author
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Jouffroy, Romain, Gille, Sonia, Gilbert, Basile, Travers, Stéphane, Bloch-Laine, Emmanuel, Ecollan, Patrick, Boularan, Josiane, Bounes, Vincent, Vivien, Benoît, and Gueye, Papa
- Subjects
- *
SEPTIC shock , *HYPOTENSION , *INTENSIVE care units , *EMERGENCY medical services - Abstract
A relative hypovolemia occurs during septic shock (SS); the early phase is clinically reflected by tachycardia and low blood pressure. In the prehospital setting, simple objective tools to assess hypovolemia severity are needed to optimize triaging. The aim of this study was to evaluate the relationship between shock index (SI), diastolic SI (DSI), modified SI (MSI), and age SI (ASI) and 28-day mortality of patients with SS initially cared for in a prehospital setting of a mobile intensive care unit (MICU). From April 6, 2016 through December 31, 2021, 530 patients with SS cared for at a prehospital MICU were analyzed retrospectively. Initial SI, MSI, DSI, and ASI values, that is, first measurement after MICU arrival to the scene were calculated. A propensity score analysis with inverse probability of treatment weighting (IPTW) method was used to assess the relationship between SI, DSI, MSI, and ASI and 28-day mortality. SS resulted mainly from pulmonary, digestive, and urinary infections in 44%, 25%, and 17% of patients. The 28-day overall mortality was 31%. IPTW propensity score analysis indicated a significant relationship between 28-day mortality and SI (adjusted odds ratio [aOR] 1.13; 95% CI 1.01–1.26; p = 0.04), DSI (aOR 1.16; 95% CI 1.06–1.34; p = 0.03), MSI (aOR 1.03; 95% CI 1.01–1.17; p = 0.03), and ASI (aOR 3.62; 95% CI 2.63–5.38; p < 10–6). SI, DSI, MSI, and ASI were significantly associated with 28-day mortality among patients with SS cared for at a prehospital MICU. Further studies are needed to confirm the usefulness of SI and SI derivates for prehospital SS optimal triaging. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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27. Preparation and properties of cellulose nanofiber/Ti3C2Tx/Poly(lactic acid) composite film.
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Yan, Xiaofei, Shao, Yehua, Gao, Zhaoyang, Wu, Bei, Wang, Chen, Zhu, Chenyan, and Tu, Lexi
- Subjects
- *
LACTIC acid , *POLYLACTIC acid , *ELECTROMAGNETIC testing , *CELLULOSE , *ELECTROMAGNETIC shielding , *ELECTROMAGNETIC fields , *FIBROUS composites - Abstract
Poly(lactic acid) (PLA), a new renewable and environmentally friendly polymer material, has gained significant attention in recent years. However, its application is limited by challenges such as poor thermal stability, brittleness and limited impact resistance. At present, PLA is predominantly modified through blending, filling and copolymerization methods. Although the above modification methods can effectively improve the properties of PLA, there are still some deficiencies in some places. In this work, CNF/Ti3C2Tx/PLA composites were prepared by impregnation with poly(lactic acid) (PLA) and cellulose nanofibers (CNF), a new two-dimensional material Ti3C2Tx, and a complete CNF membrane as a support framework. The effects of CNF and Ti3C2Tx incorporation on the thermal, mechanical and electromagnetic shielding properties of PLA were investigated using various characterization techniques including FT-IR, XRD, DSC, TGA, tensile testing and electromagnetic test characterization. The results showed that CNF can improve the thermal stability and crystallinity of PLA, where the crystallinity can reach 23.5%. CNF synergized with Ti3C2Tx to improve the mechanical properties of PLA, and the tensile strength was increased by 64.29%. Furthermore, Ti3C2Tx imparted electromagnetic shielding properties to PLA composites. The findings expand the application of PLA composites in the field of electromagnetic shielding. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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28. Research progress and prospect of the materials of bipolar plates for proton exchange membrane fuel cells (PEMFCs).
- Author
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Gao, Xin, Chen, Jiayi, Xu, Runjing, Zhen, Zheng, Zeng, Xiantai, Chen, Xiaodong, and Cui, Lifeng
- Subjects
- *
PROTON exchange membrane fuel cells - Abstract
Bipolar plates are recognized as an important component of proton exchange membrane fuel cells (PEMFCs) because of their critical duties of separating reactant gas, cooling medium, conducting electricity, as well as discharging heat and product water. Recognizing the importance of bipolar plates to the functioning of PEMFCs, researchers have been committed to create bipolar plates with high conductivity, good air tightness, appropriate mechanical qualities, corrosion resistance, and cheap cost. In this review, we provide an overview of the functional requirements and parameter specifications for bipolar plates, followed by a detailed analysis of research developments in recent years for three categories of bipolar plates: graphite, metallic, and composite. Meanwhile, the influence of physicochemical parameters, such as the morphologies, internal structure and composition, on the corrosion-resistance ability, mechanical strength, electrical and thermal conductivities of bipolar plates are examined and reported. This review covers various research directions and highlights the most promising avenues for future research. The objective of this review is to give guidelines for researchers who intend to create high-performance bipolar plates for use in PEMFCs. [Display omitted] • The article summarizes the development trends of materials in bipolar plates (BPs). • High conductivity, good air tightness and corrosion resistance are important for BPs. • The inherent properties of graphite BPs limit further development. • Composite BPs focus on the physical and chemical properties of conductive fillers. • Metallic BPs focus on coating technology and metal components. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. Experimental Study on Modified Fruit Shell Carbon for Methane Adsorption and Decarbonization.
- Author
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Yan Mao, Li Huang, Zhiqiang Hao, Hongge Tao, Chunyao Qing, Shengyong Liu, Guangtao Wang, and Qingyan Ma
- Subjects
- *
CARBON dioxide mitigation , *ACTIVATED carbon , *ADSORPTION (Chemistry) , *ULTRASONIC equipment , *ADSORPTION capacity , *RICE hulls - Abstract
Modification of activated carbon has the potential to improve its adsorption and separation capacity. Different concentrations of ammonia (6%, 9%, 12%, 15%) and treatment times (4 h, 6 h, 8 h, 10 h) were used to modify jujube shell carbon and coconut shell carbon in ultrasonic washing equipment. Biogas adsorption experiments were carried out with modified activated carbon to study the effect of adsorption and decarbonization on activated carbon surface functional groups. After modification, the surface alkaline functional groups of activated carbon increased, the acidic functional groups decreased, and the adsorption performance of CO2 was enhanced. In addition, the specific surface area and total pore volume of activated carbon decreased, the average pore size increased, and the degree of graphitization increased. In the experimental research range, under ultrasonic conditions, jujube shell carbon impregnated with 12% ammonia water for 4 h and coconut shell carbon impregnated with 9% ammonia water for 10 h had the best modification effect. The adsorption capacity for CO2 was 1.83 and 1.745 mmol/g, respectively, which increased by 0.8 mmol/g and 0.599 mmol/g, respectively, compared with the unmodified sample. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
30. Modified Retzius-sparing robot-assisted radical prostatectomy for cases with anterior tumor: a propensity score-matched analysis.
- Author
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Qian, Jiajun, Fu, Yao, Marra, Giancarlo, Zhang, Feifei, Wu, Xiao, Li, Danyan, Xu, Linfeng, Qiu, Xuefeng, Gan, Weidong, and Guo, Hongqian
- Abstract
Objective: To compare the outcomes between a modified Retzius-sparing robot-assisted radical prostatectomy (mRS-RARP) technique and conventional robot-assisted radical prostatectomy (Con-RARP) technique for cases with anterior prostate cancer (PCa), especially positive surgical margin (PSM) rates and urinary continence (UC). Patients and methods: We retrospectively included 193 mRS-RARP and 473 Con-RARP consecutively performed by a single surgeon for anterior PCa. Perioperative complications, pathology, and continence were compared after propensity score matching using 9 variables. Results: After matching (n = 193 per group), PSM were not significantly different in the two groups (16.1% in mRS-RARP group vs. 15.0% in Con-RARP group, p = 0.779). The UC at catheter removal and at 1-month was significantly higher in the mRS-RARP (24.9% vs. 9.8%, p < 0.001; 29.0% vs. 13.5%, p < 0.001, respectively), but not at 3-, 6-, and 12-month follow-ups (p = 0.261, 0.832, and 0.683, respectively). Conclusion: mRS-RARP seems to be an oncologically safe approach for patients with anterior PCa. Compared with the conventional approach, mRS-RARP approach shows benefits in the short-term postoperative UC recovery. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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31. A modified triple tibial osteotomy for management of canine cranial cruciate ligament disease: retrospective assessment of 309 procedures (2017–2020).
- Author
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Wiseman, W and Wilson, L
- Subjects
ANTERIOR cruciate ligament ,SURGICAL site infections ,OSTEOTOMY ,SURGICAL complications ,MENISCUS injuries - Abstract
Medical records from a single referral hospital (Animal Referral Hospital, Sinnamon Park, Australia) of dogs treated with modified triple tibial osteotomy (TTO) for management of cranial cruciate ligament (CrCL) disease from June 2017 to June 2020 were reviewed. Modifications to the originally described TTO procedure included a modified wedge angle calculation and performing the tibial osteotomies without the use of pre-drilled guide holes. A total of 253 dogs met the inclusion criteria. Two dogs were excluded, leaving 251 dogs that had undergone 309 procedures for assessment, and data from these, including complications, were reviewed. Complete, partial competent, and partial incompetent rupture of the cranial cruciate ligament was identified in 202/309 (65.4%), 79/309 (25.6%), and 28/309 (9.1%) stifles, respectively. Medial meniscal injury was identified in 207/309 (67.0%) stifles at the time of initial surgery. Fifty-eight dogs had bilateral procedures, including both single-session and staged surgeries, and 48 of these were available for analyses. The modifications to the TTO procedure described herein resulted in a median wedge angle of 21° and a median post-operative tibial plateau angle of 5.8°. Tibial compression testing following surgery indicated elimination of cranial tibial thrust in all stifles in this series. The most common intra-operative complication was tibial tuberosity fracture (15/309; 4.9%). Minor post-operative complications occurred in 37/309 (12.0%) procedures, with infection being the most common (27/309; 8.7%). Major post-operative complications occurred in 9/309 (2.9%) procedures. The intra- and post-operative complication rates for dogs undergoing bilateral single-session TTO were both 8.3% (2/24). The intra- and post-operative complication rates for dogs undergoing bilateral staged TTO were both 4.2% (1/24). The low number of complications for both the bilateral single-session and bilateral staged TTO groups precluded statistical analysis. All complications resolved uneventfully as determined by the attending surgeon. The modified TTO technique described here was safe and effective for the management of canine CrCL disease in the dogs included in the case series. Findings of this study suggest that, with careful case selection, the modified TTO may be performed as a bilateral single-session procedure in dogs with concurrent bilateral cranial cruciate ligament disease. Future studies analysing the effects of these modifications on stifle biomechanics would be beneficial. CrCL: Cranial cruciate ligament; SSI: Surgical site infection; TPA: Tibial plateau angle; TPLO: Tibial plateau levelling osteotomy; TTA: Tibial tuberosity advancement; TTO: Triple tibial osteotomy [ABSTRACT FROM AUTHOR]
- Published
- 2024
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32. Transition Metal Complexes with Amino Acids, Peptides and Carbohydrates in Catalytic Asymmetric Synthesis: A Short Review.
- Author
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Titova, Yuliya
- Subjects
TRANSITION metal complexes ,CHEMICAL reactions ,ASYMMETRIC synthesis ,CARBOHYDRATES ,PEPTIDES ,OPTICAL rotation ,AMINO acids - Abstract
The present review is devoted to the application of transition metal complexes with such ligands as amino acids, peptides and carbohydrates in catalysis. The literature published over the past 20 years is surveyed. Among the distinctive features of these ligands are their versatility, optical activity, stability and availability. Furthermore, depending on the specific synthetic task to be solved, these ligands open up almost infinite opportunity for modification. Largely thanks to their multifaceted reactivity, transition metal complexes with amino acids, peptides and carbohydrates can catalyze most of the known chemical reactions affording optically pure compounds. In this review, the emphasis is placed upon C(sp
3 )–H activation, cross-coupling and hydrogenation (including traditional hydrogenation in the presence of hydrogen gas and hydrogenation with hydrogen transfer) reactions. The choice is not accidental, since these reactions on the one hand display the catalytic versatility of the above complexes, and on the other hand, they are widely employed in industry. [ABSTRACT FROM AUTHOR]- Published
- 2024
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- View/download PDF
33. FeCl3 改性活性炭脱硫性能研究.
- Author
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胡谦, 刘然, 赵俊, and 吕庆
- Abstract
Copyright of Multipurpose Utilization of Mineral Resources / Kuangchan Zonghe Liyong is the property of Multipurpose Utilization of Mineral Resources Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
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34. Biomechanical evaluation of a modified intramedullary nail for the treatment of unstable femoral trochanteric fractures
- Author
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ChaoFeng Wang, MingMing Hou, CongMing Zhang, Teng Ma, Zhong Li, Hua Lin, Kun Zhang, and Qiang Huang
- Subjects
Finite element model ,Modified ,Intramedullary nail ,Unstable ,Trochanteric fracture ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: The Proximal Femoral Nail Antirotation (PFNA) device is the most commonly used implant to fix unstable femoral trochanteric fractures (UFTFs), but it has a relatively high incidence of complications. Due to this factor, the modified intramedullary nail (MIN) was created to treat patients with UFTFs. The aim was to exhibit the MIN and make a comparison with PFNA and InterTAN using biomechanical methods. Methods: An adult UFTF model was developed using Mimics software. The PFNA, InterTAN nail, and MIN models were drawn referring to the corresponding parameters and installed in the fracture models. Vertical, anteroposterior (AP) bending, and torsion loads of the femoral head were set in advance and loaded onto the fracture models. The value of maximal displacement and von Mises stress was evaluated via finite element analysis (FEA). Results: The MIN model had smaller values for maximal displacement than that of the PFNA model, and the increase in displacement was less pronounced for the MIN compared to PFNA under increasing vertical loads. For the indicator of von Mises stress, the MIN model showed lower stress compared with the PFNA model in vertical loads ranging from 300 N to 2100 N. Except for the maximal stress at implants under AP bending loads, the MIN demonstrated the most superior biomechanical properties under AP bending and torsional loads. Conclusion: The MIN offered obvious advantages in terms of mechanical stability and stress distribution among the three studied implants, providing a promising implant option for patients with UFTFs.
- Published
- 2024
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35. Modified Platelet Rich Plasma Therapy for Alopecia Totalis.
- Author
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Dhiman, Avita and Bagri, Manmohan
- Subjects
- *
ALOPECIA areata , *PLATELET-rich plasma , *BALDNESS , *TRIAMCINOLONE acetonide , *AUTOIMMUNE diseases - Abstract
Alopecia areata (AA) is an autoimmune disease characterized most commonly by patchy nonscarring hair loss which may progress to alopecia totalis which has poor prognosis. Platelet-rich plasma (PRP) therapy along with intralesional triamcinolone acetonide that is modified PRP proved to be beneficial in the case of alopecia totalis and helps in weaning patient off oral immunosuppression. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
36. Characteristics of GABA (Gamma Amino Butyric Acid), antioxidant and sensory quality of modified Tempeh
- Author
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Heny Herawati, Elmi Kamsiati, Diana Nur Afifah, Eni Kusumaningtyas, Muchamad Bachtiar, Sunarmani, and Iceu Agustinisari
- Subjects
GABA ,antioxidant ,sensory ,modified ,Tempeh ,Nutrition. Foods and food supply ,TX341-641 ,Food processing and manufacture ,TP368-456 - Abstract
ABSTRACTGABA (Gamma Amino Butyric Acid) is a non-protein amino acid that is beneficial to health. Tempeh is a fermentation product with GABA and antioxidant components that contribute to its health-promoting properties. This study aimed to determine the effect of the type of raw material and coloring method on the characteristics of the functional content of modified Tempeh. The research utilized a Completely Randomized Design with raw material types (sorghum, adlay, soybeans, and mung beans) and drying methods (oven drying and freeze-drying) as treatments. The results showed that the type of raw material and drying method had significant effect on the levels of GABA, flavonoids, total phenolic content, and the antioxidant activity of the modified Tempeh. The sorghum tempeh dried with a freeze dryer exhibits the highest GABA content at 1421 mg/100 grams. From a statistical perspective, the antioxidant capacity generated in fresh green bean and soybean tempeh is categorized as moderate. Modified Tempeh made from soybean had sensory acceptance and it did not significantly different from the control.
- Published
- 2023
- Full Text
- View/download PDF
37. Experimental Study on Modified Fruit Shell Carbon for Methane Adsorption and Decarbonization
- Author
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Yan Mao, Li Huang, Zhiqiang Hao, Hongge Tao, Chunyao Qing, Shengyong Liu, Guangtao Wang, and Qingyan Ma
- Subjects
activated carbon ,ammonium hydroxide ,ultrasonic wave ,modified ,decarbonization ,Biotechnology ,TP248.13-248.65 - Abstract
Modification of activated carbon has the potential to improve its adsorption and separation capacity. Different concentrations of ammonia (6%, 9%, 12%, 15%) and treatment times (4 h, 6 h, 8 h, 10 h) were used to modify jujube shell carbon and coconut shell carbon in ultrasonic washing equipment. Biogas adsorption experiments were carried out with modified activated carbon to study the effect of adsorption and decarbonization on activated carbon surface functional groups. After modification, the surface alkaline functional groups of activated carbon increased, the acidic functional groups decreased, and the adsorption performance of CO2 was enhanced. In addition, the specific surface area and total pore volume of activated carbon decreased, the average pore size increased, and the degree of graphitization increased. In the experimental research range, under ultrasonic conditions, jujube shell carbon impregnated with 12% ammonia water for 4 h and coconut shell carbon impregnated with 9% ammonia water for 10 h had the best modification effect. The adsorption capacity for CO2 was 1.83 and 1.745 mmol/g, respectively, which increased by 0.8 mmol/g and 0.599 mmol/g, respectively, compared with the unmodified sample.
- Published
- 2023
38. Ba-modified peanut shell biochar (PSB): preparation and adsorption of Pb(II) from water
- Author
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Qianqian Duan, Tianrui Yang, Jingyi Chen, Junsheng Liu, Liping Gao, Junfei Zhang, and Shitao Lin
- Subjects
adsorption ,biochar ,heavy metal ions ,modified ,pb(ii) ,peanut shell ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
The impact of Ba-modified peanut shell biochar (Ba-PSB) on Pb(II) removal was studied and BaCl2 was used as a modifier. It was shown that the PSB obtained at 750 °C had the best adsorption effect, and the Ba-PSB had a larger specific surface area and a good adsorption effect on Pb(II). At pH = 5, concentration was 400 mg/L, time was 14 h, and temperature was 55 °C, the loading amount of black peanut shell biochar (BPSB), red peanut shell biochar (RPSB), Ba-BPSB, and Ba-RPSB reached 128.050, 98.217, 379.330, and 364.910 mg/g, respectively. In addition, based on the non-linear fitting, it was found that the quasi-second-order kinetic model, and isothermal model could be applied to describe Pb(II) adsorption on PSB and Ba-PSB. The adsorption behavior of PSB unmodified and modified was a spontaneous process. Moreover, chemical modification of BPSB, RPSB, Ba-BPSB, and Ba-RPSB for hindering of –COOH and –OH groups revealed 81.81, 77.08, 86.90, and 83.65% removal of Pb(II), respectively, which was due to the participation of –COOH, while 17.61, 21.70, 12.77, and 15.06% was from –OH group, respectively. The increase of cation strength (Na+, K+, Ca2+, and Mg2+) will reduce the adsorption capacity of PSB for Pb(II). HIGHLIGHTS Ba-modified PSB was prepared and its adsorption property was examined.; The modification of PSB could greatly improve its loading amount for Pb(II).; The effect of –COOH and –OH groups from PSB on Pb(II) sorption was scrutinized.; Ba-modified PSB was an excellent green adsorbent for Pb(II) removal from water.;
- Published
- 2023
- Full Text
- View/download PDF
39. Preparation of PEG-Bi-PbO2 electrode and investigation on its catalytic performance
- Author
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Liu, Dong, Kang, Zhongnan, Xu, Guangyu, Chen, Wen, and Ding, Yigang
- Published
- 2024
- Full Text
- View/download PDF
40. Electrochemical Sensor of Human Serum Albumin Bio-analyte Prepared Utilizing a Thin Film of Polydopamine/TiO2 Nanoparticles: Experimental and Docking Theoretical Investigations
- Author
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Zare, Najmeh, Shojaei, Moein, Taher, Mohammad Ali, Afshar, Elham Ashrafzadeh, Ghalkhani, Masoumeh, Raja, G. Ganesh, and Karimi, Fatemeh
- Published
- 2024
- Full Text
- View/download PDF
41. Novel Fe3O4-modified biochar generated from rice husk: a sustainable strategy for strengthening lead absorption in wastewater
- Author
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Ha, T. T. V., Viet, N. M., Quan, V. T., and Huong, N. T. L.
- Published
- 2024
- Full Text
- View/download PDF
42. Preparation of Modified UiO-66 Catalyst and Its Catalytic Performance for NH3-SCR Denitration
- Author
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Wu, Yanxia, Liang, Hailong, Chen, Yufeng, Hu, Liming, and Wang, Chunpeng
- Published
- 2024
- Full Text
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43. Results of surface hot-in place recycling (remix) of modified and alternative asphalt mixtures in Finland. Part II: bitumen scale.
- Author
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Castillo, Daniel, Falchetto, Augusto Cannone, and Korkiala-Tanttu, Leena
- Subjects
- *
ASPHALT , *BITUMEN , *ASPHALT pavement recycling , *REMIXES , *MIXTURES , *DATABASES - Abstract
Surface hot-in place recycling of asphalt mixtures has been conducted on Finnish roads for several years. The procedure is performed either in full-lane('remix') or shorter widths ('rut-remix'). In a 2020-2021 project, different mixture types were subjected to both kinds of recycling; reference mixtures, and mixtures modified with aramid fibres, FEP elastomer pellets, polymer, Storelastic rubber additive, recycled asphalt shingles, steel slag, and soft bitumen. This paper (Part II) presents the results of an extensive laboratory test plan at the bitumen scale. Asphalt mixture cores were recovered from four roads, and the bitumen was extracted fortesting. Various tests were performed on the bitumens in original state (aged, before recycling) and after recycling (remix or rut-remix), including FT-IR, DSR, MSCR, as well as bitumen content, penetration, and softening point. The master curves were constructed for all bitumens. Gradations are also presented herein. The effect of remix/rut-remix is evaluated via changes in all measured properties (including Glover-Rowe) before and after recycling, over a wide range of temperatures. The results complement the mixture-scale data and provide a comprehensive database of bitumen performance for an extended group of materials. Data appendices are accessible from the link at the bottom of the page. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
44. Results of surface hot-in place recycling (remix) of modified and alternative asphalt mixtures in Finland. Part I: mixture scale.
- Author
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Castillo, Daniel, Cannone Falchetto, Augusto, and Korkiala-Tanttu, Leena
- Subjects
- *
ASPHALT , *ASPHALT pavement recycling , *MIXTURES , *REMIXES , *THICKNESS measurement , *DATABASES - Abstract
Surface hot-in place recycling of asphalt mixtures has been conducted on Finnish roads for several years. The procedure is performed either in full-lane ('remix') or shorter widths ('rut-remix'). In a 2020–2021 project, different mixture types were subjected to both kinds of recycling; reference mixtures, and mixtures modified with aramid fibres, FEP elastomer pellets, polymer, Storelastic rubber additive, recycled asphalt shingles, steel slag, and soft bitumen. This paper (Part I) presents the results of an extensive laboratory test plan at the mixture scale. Asphalt mixture cores were recovered from four roads. Various tests were performed on the mixtures in original state (aged, before recycling) and after recycling (remix or rut-remix), including strength (ITSR), stiffness, Prall abrasion, creep permanent deformation, as well as bulk, air voids, and thickness measurements. The effect of remix/rut-remix is assessed using scores calculated from mixture-scale test results. The results show that remix and rut-remix are highly heterogeneous processes, affecting every material differently and sometimes erratically. Adequate air void contents and evenness in compaction are critical for good performance. The results provide a reference performance database for an extended group of materials. Data appendices are accessible from the link at the bottom of the page. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
45. Oxidation of Ceftazidime by Modified Rice Husk Biochar-Activated Persulfate.
- Author
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Yang, Wei, Wang, Guo-xiang, and Chen, Jun-nan
- Subjects
RICE hulls ,CEFTAZIDIME ,AGRICULTURAL wastes ,BIOCHAR ,CHEMICAL kinetics ,RADICALS (Chemistry) - Abstract
Rice husk biochar (RHB-2) was prepared from agricultural waste rice husk by high-temperature pyrolysis and modified with NaOH. The char structure before and after modification was characterized by FT-IR, XRD, SEM, and XPS techniques. The effects of different parameters (initial pH of the solution, biochar dosing, persulfate concentration, reaction temperature, and inorganic anions in the solution) on the degradation of ceftazidime were investigated. There is a preliminary examination of the kinetics and reaction mechanism of the alkali-modified rice husk biochar-activated persulfate (PS) for the degradation of ceftazidime. The results indicated that removing ceftazidime by RHB-2/PS is significantly higher than single RHB-2, PS, and RHB-1/PS systems. Under the conditions of biochar dosage of 3 g/L, persulfate concentration of 10 mmol/L, reaction temperature of 60 °C, and no adjustment of initial solution pH, the removal of ceftazidime by RHB-2/PS system reached 95.2% in 80 min. Additionally, the degradation rate could reach 46.67% after the rice husk biochar has been recycled four times, which indicated that rice husk biochar has good reusability and stability. Ceftazidime degradation in the RHB-2/PS system was according to the first-order reaction kinetic model and the identification of radical species demonstrated that the dominant radical for ceftazidime degradation is the sulfate radical. This study focuses on the use of agricultural waste rice husk as a raw material, using alkali modification technology and the high activation catalytic material prepared by calcination at high temperature, in synergy with the efficient removal of the target pollutant ceftazidime by persulfate. Optimum conditions: 3 g/L catalyst, 10 mmol/L persulfate concentration, 60 °C reaction temperature, no change in pH of the initial solution, 95.2% degradation of ceftazidime in 80 min [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
46. Development of a modified propagation model of a wireless mobile communication system in a 4G network.
- Author
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Olukunle, Akande Akinyinka, Kunle, Akinde Olusola, Joel, Odeyinka Oluwadara, Okikiade, Ilori Abolaji, Olusegun, Adigun Matthew, and Adeola, Ajagbe Sunday
- Subjects
MOBILE communication systems ,WIRELESS communications ,4G networks ,STANDARD deviations - Abstract
Pathloss is a key element that causes signal deterioration in the channel as the signal power reduces inversely with propagation distance, this deterioration experienced by the channel is majorly as a result of reflection, absorption, and scattering of the signal. This study however takes into consideration the radio path loss for precise base station (BS), frequency, and power adjustment prediction evaluated over a frequency of 2.3 GHz. With a distance range between 0.1 and 1.5 km for collection of data on the measured received signal strength (MRSS), five empirical models and a modified model were used to validate the measured data to determine their suitability for pathloss prediction at Federal University of Technology, Owerri (FUTO), Imo state, Nigeria. The results shows that the root mean square error (RMSE) for the Okumura-Hata, COST 231-Hata, Ericsson model, Lee, Stanford University Interim (SUI), ECC-33, and modified models are 14.33, 9.73, 25.79, 48.4, 33.76, and 8.31 dB respectively. Additionally, the Ericsson model provided 0.498 dB, the COST 231-Hata recorded 0.733 dB, and the modified model provided 0.453 dB for mean absolute percentage error (MAPE). Therefore, the improved model produces the best results, consequently, be deployed to approximately predict path loss for mobile radio coverage in Owerri, Nigeria. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
47. Research on the Impregnation Process and Mechanism of Silica Sol/Phenolic Resin Modified Poplar Wood.
- Author
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Wang, Hongxing, Zhang, Yinliang, Li, Huijie, Hou, Haojie, Li, Chunfeng, and Liu, Mingli
- Subjects
PHENOLIC resins ,WOOD ,FOURIER transform infrared spectroscopy ,POPLARS ,DYNAMIC mechanical analysis - Abstract
Phenolic resin-modified materials partially reduce the toughness of the wood. In this study, organic–inorganic composite modifiers were used to modify the wood. Silica sol/phenolic resin was prepared through in-situ polymerization, and poplar wood was modified using a vacuum pressure impregnation process, enhancing its toughness. Orthogonal experiments were conducted, and the impact toughness of the modified poplar wood was used as the evaluation index. Through orthogonal experiments, using the impact toughness of modified poplar as the evaluation indicator, it was found that when the average particle size of the silica sol is 8–15 nm, the pressure is 1.2 MPa, and the pressurization time is 3 h, the impregnation-modified poplar's impact toughness reaches its optimum, improving by 84.1% and 135.4% compared to the raw material and phenolic resin impregnated wood, respectively. The Fourier Transform Infrared Spectroscopy (FT-IR) results indicated that the characteristic absorption peak of Si-O-Si appears in the poplar wood after impregnation, confirming the formation of new silicon-oxygen (Si-O) chemical bonds. X-ray Photoelectron Spectroscopy (XPS) analysis revealed that a chemical reaction occurs between the impregnation liquid and the wood, generating Si-O-C. Subsequently, through Dynamic Mechanical Analysis (DMA) and Thermogravimetric (TGA) analysis, it was understood that this chemical reaction significantly enhances the thermal stability and toughness of the impregnated material, making it superior to the original poplar material. The TGA further unveiled that, compared to untreated poplar, the thermal stability of the impregnated material has been notably improved. Lastly, Scanning Electron Microscopy (SEM) analysis demonstrated that the composite impregnation liquid successfully permeates and fills the interior of the poplar cells. [ABSTRACT FROM AUTHOR]
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- 2023
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48. Modified nusinersen intrathecal injection method: inclusion of a septal needle-free closed infusion connector.
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Yani Zhang, Kelu Zheng, Cuili Liang, Ruidan Zheng, Jinghui Chen, Minyan Jiang, Zhizi Zhou, Yuan Zhao, Min Rao, Sida Yang, Wenxiong Chen, and Li Liu
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INTRATHECAL injections ,MUSCULAR atrophy ,MUSCLE tone ,BACK muscles ,SPINAL muscular atrophy - Abstract
Objective: Nusinersen, an extremely expensive biologic drug (around 100,000 US$ per dose) that needs to be administered intrathecally, is approved for the treatment of 5q-spinal muscular atrophy (SMA). Because of the low muscle tone of the back muscles of pediatric SMA patients, especially type 1 SMA patients, the safe, effective, and fast execution of sheath injection is needed. Therefore, a modified intrathecal injection method was developed accordingly. This paper aims to describe the applicability and safety of this modified method. Methods: The modified intrathecal injection method (MIIM) mainly includes a septal needle-free closed infusion connector between the lumbar puncture needle and the syringe, besides the procedures of routine lumbar puncture. Its applicability and safety were evaluated through clinical observation. Results: A total of 92 children with SMA have successfully received nusinersen treatment at our hospital using the modified method since 2019 without obvious adverse events related to the modified injection method. Based on the clinical feedback of operators, the advantages of the modified method include successfully injecting the total dose of nusinersen with constant injection rate and a more stable fixation of the puncture needle, as well as making the operator more relaxed. However, compared with the routine method, the procedure of the modified method has additional steps. Conclusion: The modified intrathecal injection method is an effective and safe method to inject nusinersen when weighing the pros and cons, and it may also be used for administering intrathecal injections of other expensive medicines or for patients with other strict requirements for intrathecal injection. [ABSTRACT FROM AUTHOR]
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- 2023
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49. Modified Technique of Setting Capsulotomy Thickness in Reducing Capsulotomy-Related Complications During Femtosecond Laser-Assisted Cataract Surgery: A Prospective, Comparative Cohort Study.
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Teshigawara, Takeshi, Akaishi, Miki, Mizuki, Yuki, Takeuchi, Masaki, Hata, Seiichiro, Meguro, Akira, and Mizuki, Nobuhisa
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CATARACT surgery , *COHORT analysis , *SURGICAL complications , *COMPARATIVE studies - Abstract
Introduction: Although uncommon, incomplete capsulotomy, anterior capsule tags and anterior capsule tears are still encountered during femtosecond laser-assisted cataract surgery (FLACS), resulting in surgical complications. This highlights the need to improve femtosecond laser-assisted capsulotomy technique to reduce capsulotomy-related complications. Therefore, the purpose of this study was to investigate the efficacy of a newly developed, modified technique of setting capsulotomy irradiation thickness in lowering the incidence of capsulotomy-related complications in FLACS. Methods: This open-label prospective, comparative cohort study included 440 eyes (220 patients) treated with FLACS using the LenSx laser system (Alcon Laboratories, Inc. Fort Worth, TX, USA). Varying capsulotomy irradiation thicknesses were applied in each eye of the same patient. In Group 1, capsulotomy irradiation thickness was set between the upper edge of the highest point of the anterior capsule and the lower edge of the lowest point of the anterior capsule (modified technique). In Group 2, this was set between the center of the highest point of the anterior capsule and the center of the lowest part of the anterior capsule (conventional technique). Incidence rates of incomplete capsulotomy, anterior capsule tags and tears, and posterior capsule tears were compared. Results: Preoperative baseline characteristics showed no significant differences. Mean total of the irradiation thicknesses was 877.1 ± 81.9 µm in Group 1 and 808.9 ± 80.0 in Group 2, with a statistically significant difference (P < 0.001). Incidences of incomplete capsulotomy were 1.8% and 7.7%, anterior capsule tags were 2.3% and 8.6%, and anterior capsule tears were 0% and 3.2% in Groups 1 and 2, respectively. These differences were statistically significant (P = 0.006, 0.005, and 0.015, respectively). No posterior capsule tears were reported in either group. Conclusion: The modified technique for capsulotomy in FLACS may significantly reduce the occurrence of capsulotomy-related complications, maximizing the benefits of FLACS. [ABSTRACT FROM AUTHOR]
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- 2023
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50. 微纳米含氮秸秆生物炭对Pb2+的吸附特性与机理.
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李荭荭, 陈欣洁, 叶燕清, 杨浙湘, 黄兴洲, 周曦, and 张温尔
- Abstract
Copyright of Journal of Ecology & Rural Environment is the property of Journal of Ecology & Rural Environment Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
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