Search

Ruthenium oxide-based electrocatalysts have been regarded as promising alternatives to the state-of-the-art Iridium oxide (IrO2) towards acidic oxygen evolution reaction (OER). However, their practical applications of proton exchange membrane water electrolyzer (PEMWE) are severely limited by the lack of efficient strategy to balance the seesaw relation between stability and activity of ruthenium oxide (RuO2)-based catalysts. Herein, we report that both the activity and stability of RuO2can be significantly boosted though bismuth (Bi) doping. We find that the introduction of Bi can increase the initial valance state of Ru in Bi0.15Ru0.85O2, which can promote the activation of Ru active sites, and facilitate the reaction kinetics of acidic OER. Besides, the presence of Bi can strengthen the electron interaction to maintain the structure stability and improve the electrocatalytic performance by reducing the energy barriers and avoiding the overoxidation of active species. The obtained Bi0.15Ru0.85O2catalyst shows a low overpotential of 200.0 mV to reach a current density of 10 mA cm–2under acidic media, and a long-term stability for over 100 hours. Our work provides an important inspiration to rational design RuO2-based electrocatalysts with high activity and durability toward acidic OER.

In higher plants, the shoot apical meristem produces lateral organs in a regular spacing (phyllotaxy) and timing (plastochron). The molecular analysis of mutants associated with phyllotaxy and plastochron would increase our understanding of the mechanism of shoot architecture formation. In this study, we identified mutant mnd8ynp5that shows an increased rate of leaf emergence and a larger number of nodes in combination with a dwarfed growth habit from an EMS-treated population of the elite barley cultivar Yangnongpi 5. Using a map-based cloning strategy, the mnd8gene was narrowed down to a 6.7-kb genomic interval on the long arm of chromosome 5H. Sequence analysis revealed that a C to T single-nucleotide mutation occurred at the first exon (position 953) of HORVU5Hr1G118820, leading to an alanine (Ala) to valine (Val) substitution at the 318th amino acid site. Next, HORVU5Hr1G118820was defined as the candidate gene of MND8encoding 514 amino acids and containing two multidrug and toxic compound extrusion (MATE) domains. It is highly homologous to maize Bige1and has a conserved function in the regulation of plant development by controlling the leaf initiation rate. Examination of modern barely varieties showed that Hap-1 was the dominant haplotype and was selected in barley breeding around the world. Collectively, our results indicated that mnd8ynp5is a novel allele of the HORVU5Hr1G118820gene that is possibly responsible for the shortened plastochron and many noded dwarf phenotype in barley.

Two-dimensional (2D) materials including graphene, transition metal dichalcogenides, black phosphorus, MXenes, and semimetals have attracted extensive and widespread interest over the past years for their many intriguing properties and phenomena, underlying physics, and great potential for applications. The vast library of 2D materials and their heterostructures provides a diverse range of electrical, photonic, mechanical, and chemical properties with boundless opportunities for photonics and plasmonic devices. The infrared (IR) regime, with wavelengths across 0.78 μm to 1000 μm, has particular technological significance in industrial, military, commercial, and medical settings while facing challenges especially in the limit of materials. Here, we present a comprehensive review of the varied approaches taken to leverage the properties of the 2D materials for IR applications in photodetection and sensing, light emission and modulation, surface plasmon and phonon polaritons, non-linear optics, and Smith–Purcell radiation, among others. The strategies examined include the growth and processing of 2D materials, the use of various 2D materials like semiconductors, semimetals, Weyl-semimetals and 2D heterostructures or mixed-dimensional hybrid structures, and the engineering of light–matter interactions through nanophotonics, metasurfaces, and 2D polaritons. Finally, we give an outlook on the challenges in realizing high-performance and ambient-stable devices and the prospects for future research and large-scale commercial applications.

Porous 2D N-doped carbon electrocatalyst consisting of atomically disperse Ni active centers with Ni-N4-O coordinated structure which act as efficient polysulfides traps and highly LiPSs conversion catalysts.

We, the Editor and Publisher of the International Journal of Computers and Applications, have retracted the following article which was part of the Special Issue on Advanced Security Techniques for Cloud Computing and Big Data - New Directions:Dahai Yu & Juan Zhu (2019) Research on digital image wavelet transform filtering optimization processing method based on DSP Internet of Things, International Journal of Computers and Applications, DOI: 10.1080/1206212X.2019.1706031Since publication, it came to our attention that the articles published in this Special Issue were not reviewed fully in line with the journal's peer review standards and policy. We did not find any evidence of misconduct by the authors. However, in order to ensure full assessment has been conducted, we sought expert advice on the validity and quality of the published articles from independent peer reviewers. Following this post publication peer review, the Editor has determined that the articles do not meet the required scholarly standards to remain published in the journal, and therefore has taken the decision to retract. The concerns raised have been shared with the authors and they have been given the opportunity to respond. The authors have been informed about the retraction of the article.  We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions.The retracted articles will remain online to maintain the scholarly record, but they will be digitally watermarked on each page as ‘Retracted’.

Telitacicept, an injectable recombinant human B‐lymphocyte stimulating factor receptor‐antibody fusion protein, is a new dual B lymphocyte stimulator (BLyS)/APRIL (a proliferation‐inducing ligand) inhibitor that effectively blocks proliferation of B lymphocytes. This study evaluates the pharmacokinetic characteristics, tolerability, and safety of a single subcutaneous injection of various doses (80, 160, and 240 mg) of telitacicept in healthy Chinese subjects. This trial is a single‐center, randomized, open‐label phase I clinical study that includes three dose groups (80, 160, and 240 mg) with 12 subjects in each dose group. The subjects were randomly assigned to different dose groups in a 1:1:1 ratio for a single subcutaneous administration trial. After a single dose, the maximum serum concentration (Cmax) of total and free telitacicept was reached within 0.5‐1 days. The elimination half‐lives of total and free telitacicept at doses of 80–240 mg were 10.9–11.9 days and 11–12.5 days, respectively. The formation and elimination of the BLyS‐telitacicept complex were much slower; the median time to Cmaxwas 15–57 days and was significantly prolonged with increasing dose. Only two of the 36 healthy subjects had positive antidrug antibodies with antibody titers of 1:15. The severity of adverse events was mild or moderate, and no higher treatment‐emergent adverse events were reported. In conclusion, total telitacicept within a dose range of 80–240 mg and free telitacicept within a dose range of 160–240 mg had linear pharmacokinetic characteristics.

Objective: We aimed to evaluate the effectiveness and safety of preoperative electroacupuncture (EA) on the incidence of postoperative nausea and vomiting (PONV), and severity of postoperative pain, in gynecological patients undergoing laparoscopic surgery. The effects of EA administered at different preoperative time points were compared.Methods: A total of 413 patients undergoing elective laparoscopic gynecological surgery were randomly allocated into 4 groups receiving EA the day before surgery (Group Pre, n = 103), 30 min before (Group 30, n = 104) or both (Group Comb, n = 103), or usual care alone (Group Usual, n = 103). All acupuncture groups had usual care. The incidence of PONV and pain at 24 h were primary outcomes. Secondary outcomes included the severity of postoperative nausea, vomiting and pain, requirement for antiemetic medication and quality of recovery (QoR)-15 scores after surgery.Results: There were significant differences between the four groups in nausea and vomiting incidence (0–24 h), postoperative antiemetic use (0–48 h), and postoperative pain (0–6 h), with the EA groups recording the lowest levels. Regarding primary outcomes, incidence of nausea and vomiting at 6-24 h was 28/11/18/11% (p = 0.003) 23/5/8/9% (p < 0.001), respectively, for Groups Usual/Pre/30/Comb. Accordingly, EA reduced the incidence of nausea and vomiting at 6-24 h by 61/34/60% and 79/65/61% for Groups Pre/30/Comb, respectively. Regarding secondary outcomes, incidence of nausea and vomiting at 0-6 h was 20/9/11/7% (p = 0.013) and 17/7/9/6% (p = 0.021), respectively, for Groups Usual/Pre/30/Comb. Rescue antiemetics at 0–6 h were required by 18/4/11/4% (p = 0.001) in Groups Usual/Pre/30/Comb. The mean numerical rating scale (NRS) pain score (0–10) at 0–6 h was significantly different between groups (2.45/1.89/2.01/1.97 for Groups Usual/Pre/30/Comb, p = 0.024). There were no significant differences between the three EA-treated groups.Conclusion: In gynecological patients undergoing laparoscopic surgery and treated with multimodal antiemetic methods, one session of preoperative EA may be a safe adjunctive treatment for PONV prophylaxis. Optimal timing of EA requires further verification.Trial registration number: ChiCTR-INR-16010035 (Chinese Clinical Trial Registry).

Exploring bifunctional electrocatalysts with high-efficiency and stability toward overall water splitting is desirable for sustainable energy technologies, yet challenging. Herein, we report the construction of Ni3N on the surface of Ni-MOF-74 through an in-situnitriding process. The obtained Ni-MOF-74/Ni3N exhibits remarkable HER activity with an overpotential of 73 mV to deliver 10 mA cm−2. Theoretical calculations and experimental study demonstrate the electron transport between Ni3N and Ni-MOF-74, leading to the improved H2O adsorption, optimized hydrogen adsorption, and increased Haddiffusion, which contributes to the enhanced HER performance. Besides, the obtained Ni-MOF-74/Ni3N also possesses outstanding activity toward OER and overall water splitting.

Developing RuO2-based electrocatalysts with high activity and stability for acidic oxygen evolution reaction (OER) is highly desirable but remains a challenge. More critically, strategies for rational manipulation of the reaction pathway of RuO2from a kinetically favorable but unstable lattice oxygen oxidation mechanism (LOM) pathway to an adsorption evolution mechanism (AEM) pathway are still elusive. Herein, we report the synthesis of Ce-doped RuO2catalysts with the existence of oxygen vacancies (Ce-RuO2-x). Experimental results and density functional theory (DFT) calculations reveal that Ru valence state is lowered with the formation of Ce-O-Ru local structure, and Ru-O covalency is decreased, which suppress the surface Ru demetallation and lattice oxygen loss, resulting in greatly enhanced durability toward acidic OER. Moreover, the synergistic effect between Ce-O-Ru local structure and oxygen vacancies can be conducive to the stabilization of OOH∗, leading to a manipulated reaction pathway from LOM to AEM and reduced energy barrier of the rate-determining step.

Radiation-induced brain injury (RBI) is a common complication of radiotherapy for head and neck tumors while its mechanism is not fully understood. Animal whole-brain radiation (WBR) models are of key importance in experimental radiation research, and an appropriate radiation source is essential. Previous animal WBR models were administered by clinical linear accelerator to induce the pathophysiological changes of RBI. In the current study, we adopted Faxitron MultiRad 225 X-ray irradiation system to construct a mouse WBR model with a single dose of 30 Gy. In the acute phase of this mouse WBR model, brain edema and blood–brain barrier (BBB) damage were found mild. However, two months later, the results of immunofluorescence showed that astrocytes and microglia were activated continuously, and the number of immature neurons in dentate gyrus (DG) area of hippocampus was significantly reduced, in accordance with the features of chronic pathophysiological changes. Besides, data of MRI scans and behavior tests illustrated the structural changes of brain tissue and cognitive impairment in the chronic phase. To sum up, this mouse WBR model using the Faxitron MultiRad 225 irradiation system with a single dose of 30 Gy is feasible to simulate the RBI-related chronic pathophysiological changes.

A broadband vortex beam generator provides a promising solution for various applications. Since the space-charge wave of the free-electron bunch inherently covers a wide frequency range, the free-electron-driven devices can be utilized to generate broadband radiation. This work presents a wideband tunable multi-mode vortex beam generator based on the Smith–Purcell radiation (SPR) from a helical grating. The generated broadband vortex radiation presents prominent flexibility in the manipulation of frequency, topological charge, and radiation direction. The frequency range and the topological charge depend on the operating harmonic order, operating voltage, and structural parameters. The radiation direction varies with the operating frequency and covers a wide range in each band. Moreover, the proposed principle can be scaled to the terahertz frequency band. This work advances the application of the vortex beam in the millimeter wave-terahertz communication system.

Stretchable strain sensors with well-controlled sensitivity and stretchability are crucial for applications ranging from large deformation monitoring to subtle vibration detection. Here, based on single-metal material on the elastomer and one-pot evaporation fabrication method, we realize controlled strain sensor performance via a novel programable cracking technology. Specifically, through elastomeric substrate surface chemistry modification, the microcrack generation and morphology evolution of the strain sensing layer is controlled. This process allows for fine tunability of the cracked film morphology, resulting in strain sensing devices with a sensitivity gauge factor of over 10 000 and stretchability up to 100%. Devices with a frequency response up to 5.2 Hz and stability higher than 1000 cycles are reported. The reported strain sensors, tracking both subtle and drastic mechanical deformations, are demonstrated in healthcare devices, human–machine interaction, and smart-home applications.

Background: Coronary artery calcification (CAC) is an independent risk factor of major adverse cardiovascular events; however, the impact of CAC on in-hospital death and adverse clinical outcomes in patients with coronavirus disease 2019 (COVID-19) remains unclear. Objective: To explore the association between CAC and in-hospital mortality and adverse events in patients with COVID-19. Methods: This multicenter retrospective cohort study enrolled 2067 laboratory-confirmed COVID-19 patients with definitive clinical outcomes (death or discharge) admitted from 22 tertiary hospitals in China between January 3, 2020 and April 2, 2020. Demographic, clinical, laboratory results, chest CT findings, and CAC on admission were collected. The primary outcome was in-hospital death and the secondary outcome was composed of in-hospital death, admission to intensive care unit (ICU), and requiring mechanical ventilation. Multivariable Cox regression analysis and Kaplan–Meier plots were used to explore the association between CAC and in-hospital death and adverse clinical outcomes. Results: The mean age was 50 years (SD,16) and 1097 (53.1%) were male. A total of 177 patients showed high CAC level, and compared with patients with low CAC, these patients were older (mean age: 49 vs. 69 years, P&lt; 0.001) and more likely to be male (52.0% vs. 65.0%, P= 0.001). Comorbidities, including cardiovascular disease (CVD) ([33.3%, 59/177] vs. [4.7%, 89/1890], P&lt; 0.001), presented more often among patients with high CAC, compared with patients with low CAC. As for laboratory results, patients with high CAC had higher rates of increased D-dimer, LDH, as well as CK-MB (all P&lt; 0.05). The mean CT severity score in high CAC group was also higher than low CAC group (12.6 vs. 11.1, P= 0.005). In multivariable Cox regression model, patients with high CAC were at a higher risk of in-hospital death (hazard ratio [HR], 1.731; 95% CI 1.010–2.971, P= 0.046) and adverse clinical outcomes (HR, 1.611; 95% CL 1.087–2.387, P= 0.018). Conclusion: High CAC is a risk factor associated with in-hospital death and adverse clinical outcomes in patients with confirmed COVID-19, which highlights the importance of calcium load testing for hospitalized COVID-19 patients and calls for attention to patients with high CAC.

Aiming at the problems of high probability of data packet loss and long data receiving delay in current methods, an adaptive prediction method of multimedia data transmission path based on machine learning is proposed. This paper analyses the path length of multimedia data transmission, data integrity, energy consumption in the process of data transmission and reception delay, and ranks the advantages and disadvantages of data transmission paths, and finally realises the adaptive prediction of multimedia data transmission paths. The experimental results show that the proposed method is less likely to lose data packets and reduce the data receiving delay when predicting the path of multimedia data transmission. The experimental results verify the effectiveness of the proposed method. At the same time, the accuracy of adaptive prediction of data transmission path is discussed, and the discussion results of high accuracy of path prediction are obtained.

ABSTRACTObjectivesThis study aimed to evaluate the bioequivalence, safety, tolerability and immunogenicity of the biosimilar trastuzumab (SIBP-01) compared to Herceptin®.MethodsIn this Phase I randomized double-blind parallel-group trial, 100 healthy male volunteers were randomized in a1:1 ratio to receive a single 6 mg•kg–1 intravenous dose of SIBP-01 or Herceptin®. Serum concentrationswere analyzed using a validated ELISA.ResultsThe two groups had similar baseline characteristics. The geometric mean ratios (90% CI) of Cmax, AUC0-tand AUCinfbetween the trial group and the reference group were 93.55%-104.27%, 91.98%-102.35% and 91.88%-102.34%, respectively; the geometric mean ratios (90% CI) of AUC0-tand AUCinfin the sensitivity analysis were 92.29%-102.63% and 91.81%-102.16%, respectively. These values were within the prespecified equivalence margins, establishing the bioequivalence of SIBP-1 and Herceptin®. AEs were similar across all subjects in the SIBP-01 and Herceptin® arms, with treatment-related AEs reported by 72.00% and 80.00%, respectively. In each group, there was one AE that caused a subject to discontinue the study.Expert opinionTrastuzumab (Herceptin®) is significantly more effective than chemotherapy in reducing exacerbations and tumor cell growth, and its adverse events are far lower than chemotherapy. Herceptin®is very expensive for most patients in China. The protein molecular primary structure of the biosimilar trastuzumab (SIBP-01) is consistent with Herceptin®, with highly similar high level structure, biologocal activity and purity.But there are few studies comparing the bioequivalence of SIBP-01 and Herceptin® in healthy subjects and cancer patients 2.ConclusionsThis study showed the PK similarity of SIBP-01 to Herceptin®. SIBP-01 was safe and well tolerated in healthy male volunteers, with no significant differences from the reference drug in safety or immunogenicity 4.

Polluted water is a worldwide problem; therefore, effective separation of oil/water and removal of dyes, organic micropollutants, and heavy metals in wastewater are the need of the hour. Herein, hydrophilic β-cyclodextrin-grafted carboxymethyl cellulose, biodegradable polyvinyl alcohol, and chitosan were used as main raw materials to construct a multifunctional aerogel framework by simple sol–gel and directional freeze-drying methods. Featuring intrinsic superamphiphilic wettability in air, robust superoleophobic wettability underwater, and excellent shape-recovery characteristics, the biomass-derived aerogel presents durable oil/water separation even after 10 cycles. The aerogels possess prominent adsorption capacity for methyl blue, 1-naphthylamine, and Cu2+, which was as high as 121.55 mg/g, 33.96 mg/g, and 122.6 mg/g, respectively. In addition, various pollutant mixtures could be effectively adsorbed by the aerogel at the same time with the adsorption capacity of 121.75 mg/g for methyl blue, 0.97 mg/g for bisphenol A, and 20.11 mg/g for Cu2+.

The availability of transparent conductive thin films that exhibit mechanical flexibility and are adapted to low-cost and large-area fabrication is a major obstacle for high-performance flexible thin-film optoelectronics. Here, by combining printing, thin-film deposition, and wet-etching processes, interconnected transparent metal micromesh (TMM) electrodes are reported. Blade-coating is used to generate self-assembled polymer micromesh networks on flexible substrates. The network structures are subsequently converted into conductive metal networks. As-fabricated TMM films display a surface roughness of around 20 nm with thickness down to 50 nm. A transmittance of 86% and a conductance of 80 Ω sq–1are achieved at the described optimal blade-coating suspension concentration. The electrodes show mechanical flexibility with no conductivity degradation with the smallest bending radius of 1 mm or at repeated bending over 3000 cycles at a bending radius of 15 mm. We successfully demonstrate organic light-emitting diodes (OLEDs) using TMM electrodes via the blade-coating technique. The printed OLEDs have a low turn-on voltage of 3.4 V and can achieve a luminance of over 4000 cd/m2at 6.5 V. At a luminance of 100 cd/m2, the OLEDs show a current density of 7.6 mA/cm2, an external quantum efficiency (EQE) of 3.6%, and a luminous efficacy of 1.4 lm/W.

Poly(citric acid-co-glutamic acid) (PCA-GLU) was prepared successfully by using citric acid and glutamic acid as monomers. The synthesized polymers were characterized by Fourier-transform infrared spectroscopy and size exclusion chromatography. The static scale inhibition method was utilized to test the performance of PCA-GLU. The polymerization conditions, such as reaction time, reaction temperature, catalyst dosage, and monomer ratio, were optimized to gain the high-performance scale inhibitor. The scale inhibition rate exceeded 95% in simulated CaSO4fouling solution which initially contained 3,000 mg L–1Ca2+and SO42–ions when the dosage of the optimized polymer scale inhibitor was 10 mg L–1. The results of calcium ion titration experiments in static scale inhibition experiments showed that PCA-GLU can chelate with Ca2+ions, increase the content of Ca2+ions stayed in simulated water and reduce the amount of deposition of CaSO4scale. The CaSO4scale collected from the simulated water was observed by scanning electron microscopy and characterized by X-ray diffraction. PCA-GLU significantly inhibited the crystal growth of CaSO4and distorted the lattice of the crystal. Therefore, PCA-GLU is a potent inhibitor of a highly-effective green CaSO4scale.

This systematic review was conducted to evaluate the efficacy and safety of continuous nursing care for the recovery of joint function in older adults with total hip or knee arthroplasty.

Thermites are widely used in propellants, explosives and ignition materials because of their high heat release rate and good combustion efficiency. Structural control over thermites to achieve improved performance leads to a promising research area. Among these, core-shell structured composites have attracted wide attention due to their excellent properties and close contact among components. Herein, core-shell structured α-AlH3/Fe2O3thermites were prepared, which exhibit high heat-release and excellent combustion performance. At an equivalence ratio of 2.0, the core-shell structured α-AlH3/Fe2O3has the most heat release (1213.8 J/g) and the lowest reaction activation energy (147.5 kJ/mol). The ignited combustion performance of α-AlH3/Fe2O3was notably strengthened by the shorter ignition delay period (11 ms). Interestingly, the core-shell structured α-AlH3/Fe2O3was less sensitive to electrostatic discharge, which suggests that the core-shell structured α-AlH3/Fe2O3reaches the goal of high energy release and electrostatic safety. The core-shell thermite system with α-AlH3as metal fuel could provide an efficient alternative to hunt for thermites with high reactivity.

Severe water pollution has placed a heavy burden on the ecological environment on which humans rely. Effective approaches to mitigating this worldwide issue are in great demand. Here in this work, an organic–inorganic bacterial cellulose aerogel was fabricated through a freeze-drying technique and a step-by-step coating method. The as-prepared aerogel possessed an intact three-dimensional porous structure, an ultralow density, and shape recovery performance. Ag2O nanoparticles were uniformly and firmly dispersed on the cellulose skeleton, endowing the as-prepared aerogel with an excellent photocatalytic degradation property of methylene blue and great recyclability. The aerogel with zwitterionic compounds attached through the effect of silane exhibited superhydrophilicity, superoleophilicity, and underwater superoleophobicity as well as underoil superhydrophobicity, and it could separate oil/water mixtures with high efficiency. This environmentally friendly bacterial cellulose aerogel equipped with multifunctionality showed great potential for wide application in water treatment fields.

In this paper, the candidate points for distribution and substation transformers, low and medium voltage feeders, and the Distributed Energy Resources (DERs) are considered as a construction stock portfolio. The main goal of this research is to present a design method with the availability of smart grid infrastructure, which a main network is divided into several Microgrids (MGs). The design is done from the point of view of long-term operation (30 years), and all technical and economic constraints are taken into account for the optimal design of the MG. The most optimal portfolio is selected using the Imperialistic Competitive Optimization (ICA) algorithm and constituted the network design. Moreover, the uncertainty of load values is considered and the costs deviance as well as the expected value are obtained. The simulation is performed on a green field network with known geographical characteristics, and the load information is obtained using the regional load forecasting strategy. Using random values generated for the decision variable of substations, some candidate locations of DTs are selected. The low voltage feeders are connected to the not-selected substations. In the next step, the loads are considered to the selected substations based on the load allocation algorithm. Next, the assigned load points are classified into various groups by the K-means clustering algorithm. With applying the Prim method, the minimum spanning tree, with the grid graph, is calculated. The resilience of the designed grid is examined in a robust manner and in the presence of MGs. In order to study the resilience, the considered MG is divided into 4 zones based on the wind speed. The studied network is divided into 4 states as main network without dividing to several MGs, with 20 % more robustness, with 20 % less robustness, and with several MGs. The simulations are implemented with MATLAB in 11 scenarios that 3 scenarios include the controllable DERs and the remained scenarios are rendered for various uncertainty factors of loads related to the first scenario. The results show that the total cost of MG and operation cost of DER units in the third scenario are decreased about 16 % and 18 %, respectively. The results also show that the network with 20 % more robustness has better results and lower outage of loads in comparison with other states. Moreover, the connected MGs outperformed in comparison with the wide network.

A rapid and convenient method of license plate recognition is discussed. The color plates are preprocessed by transform gray-scale transformation and image enhancement. The license plate is located by edge detection and region search algorithm, and the character segmentation is made by projection. Finally, the template is matched, and the license plate number is recognized quickly and accurately. The experiment shows that the method used in this paper can achieve better recognition results.

IEEE802.16 standard provides interface protocol of wireless access system for physical (PHY) layer and Medium Access Control (MAC) layer. It supports two kinds of network topology: Point to Multi-point (PMP) and Mesh. This paper descries the MESH model characteristics and how MESH Model was supported in MAC layer by introducing full process of new nodes in Mesh mode accessing network. Furthermore, On the basis of comparing PMP model and MESH mode in MAC-layer structure, function and requirements, it comes to the conclusion: MESH nodes can access network faster and cost less than PMP nodes. Which makes it possible for those areas far away from center base station to establish multi-hop network with less investment and time cost, while coverage is expanded.

A digital clock system designed by using VHDL hardware description language is presented in this paper. The proposed architecture fully utilizes the digital clock system available on FPGA chips based top-down design method in the Quartus II development environment. The Clock system is divided into four design modules: core module, frequency_division module, display module and tune module. It not only can time accurately and display time, but also can reset and adjust time. The LED lights will flash and the loudspeaker will tell time on the hour. The architecture is implemented and verified experimentally on a FPGA board. Because of the universality of digital clock and the portability of VHDL language, it can be applied directly in various designs based on FPGA chip.

Despite continuous progress in treatment, recurrence and metastasis limit further improvement in the prognosis of breast cancer (BC) patients. Our aim was to search for a crucial prognostic biomarker of BC.

Background: The coronavirus disease 2019 (COVID-19) is a pandemic now, and the severity of COVID-19 determines the management, treatment, and even prognosis. We aim to develop and validate a radiomics nomogram for identifying patients with severe COVID-19. Methods: There were 156 and 104 patients with COVID-19 enrolled in primary and validation cohorts, respectively. Radiomics features were extracted from chest CT images. Least absolute shrinkage and selection operator (LASSO) method was used for feature selection and radiomics signature building. Multivariable logistic regression analysis was used to develop a predictive model, and the radiomics signature, abnormal WBC counts, and comorbidity were incorporated and presented as a radiomics nomogram. The performance of the nomogram was assessed through its calibration, discrimination, and clinical usefulness. Results: The radiomics signature consisting of four selected features was significantly associated with clinical condition of patients with COVID-19 in the primary and validation cohorts (P&lt; 0.001). The radiomics nomogram including radiomics signature, comorbidity and abnormal WBC counts showed good discrimination of severe COVID-19, with an AUC of 0.972, and good calibration in the primary cohort. Application of the nomogram in the validation cohort still gave good discrimination with an AUC of 0.978 and good calibration. Decision curve analysis demonstrated that the radiomics nomogram was clinically useful to identify the severe COVID-19. Conclusion: We present an easy-to-use radiomics nomogram to identify the patients with severe COVID-19 for better guiding a prompt management and treatment.

In order to detect weak chemiluminescence signal rapidly and high accurately, a chemiluminescence detection system is designed based on the core chip FPGA. The system uses a static injection mechanism as chemiluminescence reaction conduit. High-performance photodiode converts chemiluminescence signals into electrical signals replacing the traditional photomultiplier tube. It can meet the test requirements while reducing the cost of the detection system. The signal processing and storage system FPGA-based consists of A/D converter module, serial communication module, the keyboard scan control modules and memory modules. Nitrite ions in water samples are detected and the results show that in a certain concentration range the calibration curve of NO2- concentration and luminescence intensity is linear, the linear regression equation is Y = 0.4148X + 2.6508, and the correlation coefficient is R2 = 0.9832. The relative standard deviation values are 2.7%(n=11).

Simple sequence repeats (SSRs) and sequence-related amplified polymorphism (SRAP) were employed to assess the genetic diversity and relationship among 108 ramie cultivars, which were collected from China, Japan, Indonesia and Myanmar. A total of 183 polymorphic bands were produced by using 21 SSR and 20 SRAP primer pairs. The genetic similarity matrix was obtained by using the similarity for qualitative data (SIMQUAL) subroutine of the Numerical Taxonomy and Multivariate Analysis System (NTSYS-pc) software statistical package, based on Jaccard's algorithms. The results showed that the similarity coefficient among the 108 ramie germplasms ranged from 0.22 to 0.89. By using principal components analysis (PCA) and unweighted pair-group method with arithmetic means (UPGMA), the 108 ramie germplasms were clustered into two categories. Shanon diversity index (SDI) was 1.1 and Nei's gene diversity index (NGDI) was 0.58 in the present study. When comparing their indexes, the genetic diversity in the different provinces was as follows: Guizhou (SDI 1.14, NGDI 0.61) > Jiangxi (SDI 1.11, NGDI 0.60) > Guangxi (SDI 1.05, NGDI 0.59) > Hunan (SDI 1.04, NGDI 0.58) > Hubei (SDI 1.02, NGDI 0.58) > Chongqing (SDI 0.96, NGDI 0.54). There was an abundant genetic diversity in ramie accessions growing in the China's Changsha field GenBank of ramie. Guizhou province had the highest genetic diversity and thus may be the origin centre of ramie's genetic diversity. The relationship between germplasms and geographic distribution was poor.

In this paper, solid state shear milling method was successfully employed to prepare polypropylene/wood flour composites (WPC) and their structure and performances were investigated. The experimental results showed through solid state shear milling, the aggregates of wood fiber were broken down and polymer closely adhered to wood fiber, which improved the dispersion of wood fiber and the interfacial interaction between PP and wood fiber. As a result, the performances of WPCs in this way were more excellent than that of WPCs by the conventional method. This study could provide a novel approach to resolve the problems of the dispersion, stabilization and compositing of wood flour with polymer matrix and prepare WPC with higher performances.

Electronic image stabilization (EIS) is the technology which detects and removes camera jitter in image sequences by digital image processing methods. It has been widely used in moving vehicles such as airborne, shipboard and vehicle-mounted camera systems. This paper firstly introduces the basic principle and structure of EIS system. Then the key techniques for each module are introduced and compared in processing speed and application scenes. The motion estimation method based on feature points is emphatically analyzed. Some experimental simulations and further discussion are made on the existing motion filtering and compensation methods. We also summarize the evaluation criteria for EIS performance. Finally the future research trend of EIS system is presented.

In order to make the food safety testing instrument more flexible and convenient and process a lot of data, combining the advantages of the VB interface design and MATLAB secondary development, the serial communication software is developed based food safety testing instrument. The test data is uploaded to computer through RS232 serial port. The research staff needs only to input the parameters simply, and all the parameters were automatically matching with the testing instrument, the test data reception, processing, preservation, search and delete functions was completed through VB calling MATLAB. The software has the abilities of friendly interface, easy to use, high stability, and can shield and correct the misuse of users. It has high value in engineering and can be widely used in similar embedded test instrument.

For the problems that the street running state and information was difficult to feedback and reasonable control, we apply the topology model to the street lighting management system, and complete the optimization control in this paper. Using the fuzzy control theory to handle the road signals, the intelligent lighting region controller integrates the thyristor chopper with the autotransformer technology, carries out the soft start and slow slope control to the street light, and realizes automatic voltage and energy saving. At finally, the system can realize the energy-saving control and intelligent, networked management of city street lamp.

Design a step motor control system based on Field Programmable Gate Array (FPGA). Give the hardware circuit of this system and the program based on very high speed integrated circuit hardware description language (VHDL). Compared to step motor control system based on single chip microcomputer, the processing speed of this system is faster.

Application of ANSYS parametric design language APDL built the model of workover rig derrick-guy line system. Take XJ70 type workover rig for example, optimization of derrick anchor pile piling position has been calculated under the condition of anchor pile ultimate uplift force. The uplift force obtained from pullout tests and different from soil type and soil condition. By optimizing calculation, on the premise of anchor pile bearing safety, the minimum and feasible piling positions have been gotten to guide piling work in special well site conditions. When the bearing capacity of soil decreased, make hook load as design variable, get the hook load limits at each pile position to ensure the ground anchor pile bearing safety.

Through the establishment of contact element simulated the contact between sucker rod and oil pipe. The deformation of sucker rods in oil pipe that caused by the screw pump rotor eccentricity has been researched by the application of transient dynamics analysis. Results show that screw pump rotor eccentricity is one of the reasons which cause rod and oil pipe contact resulting in partial abrasion. Deformation of the sucker rods caused by the rotor eccentricity is mainly concentrated on the bottom of rods, so in order to mitigate partial abrasion, rod centralizer arrangement at the bottom of rods should be strengthened, or change the connection mode between the sucker rod and screw pump rotor to eliminate the effect of the sucker rod deformation caused by rotor eccentric motion.

It was optimized that the lateral stiffness of an under-designed super high-rise building located in 0.30g seismic fortified regions, with 58 stories above the ground and 235.80 meters total structural height. By having adequately adjusted the wall thicknesses of the core-wall and the cross sectional dimensions of the frame columns, a more reasonable structural scheme was obtained. It was then discussed the suitable numbers and heights of the strengthening stories set for controlling the building’s story drifts. Finally, it was explored that the efficiency of seismic input energy dissipation via viscous dampers installed at the right places of the structure.

The stability and the potential seismic capacity of the double-layer elliptic paraboloid latticed shell roof structure of a stadium was analyzed and evaluated, performing by Midas Gen software. Firstly, the seismic response spectrum analyses and the linear time-history analyses were carried out respectively on two different analysis models: the integral structural model containing the lower support structure and the single latticed shell model. The seismic response characteristics and the potential seismic capacity of the models were compared and evaluated. Secondly, based upon the real detailed design of the stadium, the static stability of the latticed shell was analyzed, considering both the geometrical non-linearity and the initial imperfection. Thirdly, the influence of the effects of the vertical ground motion upon the latticed shell structure was studied. The analysis method adopted and the conclusions obtained can be used as references for the future similar engineering projects.

Hydrodynamic seal ring is based on the hydrodynamic effect of rotary shaft seal, Kalsi sealing ring is the typical type of products, and the design of sealing lip adopts unique waveform structure. Based on geometry analysis of the sealing ring, the 3D model of the ring was established by using SolidWorks software, and then the model was introduced into finite element software ANSYS, which was used to analyse stress for the Kalsi of rubber sealing ring. Through the analysis of the stress of rubber ring, the position of the maximum stress value of the rubber seal in hydrodynamic pressure was wave crest (valley) in the edge of the wave side. When the pressure of seal was 10MPa, the maximum value of stress of rubber sealing was up to 6.54MPa.

This paper analyzed the statistical relationships among lane-changing, speed and density of traffic flow in different lanes of urban expressway weaving area under a given traffic condition and LOS two. A series of models was recommended. And then, the effectiveness between the recommended model and the existing model was compared. Although the optimization effect not very clear, but it shows that the lane-changing factors have some effects .

Through simulating interaction between pile and foundation soil after establishing surface-surface contact element with finite element method and ANSYS software, the load resistance performance and ultimate strength of the ground anchor pile working for a workover derrick are achieved. In winter, frozen soil depth can be up to 2 meters in north china. When temperature rises in spring, the Polar grassland changes by three stages, namely, frozen, freeze thawing and melted. But for the large temperature difference between morning and evening, the state of the soil layer is extremely unstable which greatly affect the carrying capacity of anchor piles. This paper focuses on the melting influence of soil layer and the load resistance performance is studied. With a set of calculation parameter, the simulation result shows that the carrying capacity of anchor piles decreases 28% in melted state than freeze thawing.

A novel method is described for fabricating an all‐solid‐state flexible micro‐supercapacitor. The microelectrodes of the supercapacitor are prepared by in situ electrodeposition of polyaniline (PANI) nanorods on the surface of reduced graphene oxide (rGO) patterns that are fabricated by micromolding in capillaries. The morphologies of PANI nanorods could be controlled by the concentration of aniline and the growth time in the electrodeposition process. The micro‐supercapacitor possesses electrochemical capacitance as high as 970 F g−1at a discharge current density of 2.5 A g−1, as well as good stability, retaining 90% of its initial capacitance after 1700 consecutive cycles for the synergistic effect of these new rGO/PANI nanostructures. The results show that the method could represent a route for translating the interesting fundamental properties of rGO and conducting polymers into technologically viable energy devices. Furthermore, this study might further guide the preparation of functional graphene‐based materials.

You crack me up: A topographically patterned PDMS stamp was coated with thin metal film and swelled under organic vapor to induce the tunable cracking of the brittle film into metallic nanostructures (see SEM images, scale bars 1 μm). UV/Vis spectra, OLED efficiency, and SERS spectra demonstrate the fine controllability of the metallic nanostructures, the well‐ordered and highly regulable surface plasmons, and the facile fabrication process.

Zerbröselt: Wurde ein PDMS‐Reliefstempel mit einem dünnen Metallüberzug unter organischem Lösungsmitteldampf gequollen, so brach der spröde Film in metallische Nanostrukturen auf (siehe SEM‐Bilder; Maßstab 1 μm). UV/Vis‐Spektren, OLED‐Effizienz und SERS‐Spektren belegen die Kontrolle über die Nanostrukturbildung bei diesem einfachen Herstellungsverfahren sowie das Auftreten geordneter und einstellbarer Oberflächenplasmonen.

The sinter production is affected by many factors, including total iron content, gangue content and burning loss. These paper analyses changes of three kinds of Australian iron ores in recent ten years, and then draw a conclusion that the assimilability of these three kinds of Australian iron ores are increased. These kinds of changes cause a lot of influence upon sinter production, which means negative influence. Therefore, ore blending constitution is changed by iron ore quality degradation.