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| 1 | Effective exposure of nitrogen heteroatoms in 3D porous graphene framework for oxygen reduction reaction and lithium–sulfur batteries显示文摘The introduction of nitrogen heteroatoms into carbon materials is a facile and efficient strategy to regulate their reactivities and facilitate their potential applications in energy conversion and storage. However,most of nitrogen heteroatoms are doped into the bulk phase of carbon without site selectivity, which significantly reduces the contacts of feedstocks with the active dopants in a conductive scaffold. Herein we proposed the chemical vapor deposition of a nitrogen-doped graphene skin on the 3D porous graphene framework and donated the carbon/carbon composite as surface N-doped grapheme(SNG). In contrast with routine N-doped graphene framework(NGF) with bulk distribution of N heteroatoms, the SNG renders a high surface N content of 1.81 at%, enhanced electrical conductivity of 31 S cm^(-1), a large surface area of 1531 m^2 g^(-1), a low defect density with a low I_D/I_G ratio of 1.55 calculated from Raman spectrum, and a high oxidation peak of 532.7 ℃ in oxygen atmosphere. The selective distribution of N heteroatoms on the surface of SNG affords the effective exposure of active sites at the interfaces of the electrode/electrolyte, so that more N heteroatoms are able to contact with oxygen feedstocks in oxygen reduction reaction or serve as polysulfide anchoring sites to retard the shuttle of polysulfides in a lithium–sulfur battery. This work opens a fresh viewpoint on the manipulation of active site distribution in a conductive scaffolds for multi-electron redox reaction based energy conversion and storage. | Jia-Le Shi Cheng Tang Jia-Qi Huang Wancheng Zhu Qiang Zhang | 2018 | Journal of Energy Chemistry2018，27，1： | 11 |
| 2 | A novel two-stage extended Kalman filter algorithm for reaction flywheels fault estimation显示文摘This paper investigates the problem of two-stage extended Kalman filter(TSEKF)-based fault estimation for reaction flywheels in satellite attitude control systems(ACSs). Firstly, based on the separate-bias principle, a satellite ACSs with actuator fault is transformed into an augmented nonlinear discrete stochastic model; then, a novel TSEKF is suggested such that it can simultaneously estimate satellite attitude information and actuator faults no matter they are additive or multiplicative; finally, the proposed approach is respectively applied to estimating bias faults and loss of effectiveness for reaction flywheels in satellite ACSs, and simulation results demonstrate the effectiveness of the proposed fault estimation approach. | Chen Xueqin Sun Rui Jiang Wancheng Jia Qingxian Zhang Jinxiu | 2016 | Chinese Journal of Aeronautics2016，29，2： | 7 |
| 3 | The electrochemical stability of ionic liquids and deep eutectic solvents显示文摘Room temperature ionic liquids(ILs) composed of cations and anions, as well as deep eutectic solvents(DESs) composed of hydrogen bond donors(HBDs) and hydrogen bond acceptors(HBAs), are regarded as green solvents due to their low volatility. They have been used widely for electrochemically driven reactions because they exhibit high conductivity and excellent electrochemical stability. However, no systematic investigations on the electrochemical potential windows(EPWs), which could be used to characterize the electrochemical stability, have been reported. In this regard, the EPWs of 33 ILs and 23 DESs have been studied utilizing cyclic voltammetry(CV) method and the effects of structural factors(cations and anions of ILs, and HBDs and HBAs of DESs) and external factors(electrode, water content) on the EPWs have been comprehensively investigated. The electrochemical stability of selected ILs comprising five traditional cations, namely imidazolium, pyridinium, pyrrolidinium, piperidinium and ammonium and 13 kinds of versatile anions was studied. The results show that for ILs, both cation and anion play an important role on the reductive and oxidative potential limit. For a same IL at different working electrode, for example, glassy carbon(GC), gold(Au) and platinum(Pt) electrode, the largest potential window is almost observed on the GC working electrode. The investigations on the EPWs of choline chloride(Ch Cl), choline bromide(Ch Br), choline iodide(Ch I), and methyl urea based DESs show that the DES composed of Ch Cl and methyl urea has the largest potential window. This work may aid the selection of ILs or DESs for use as a direct electrolyte or a solvent in electrochemical applications. | Qingbo Li Jingyun Jiang Guofeng Li Wancheng Zhao Xinhui Zhao Tiancheng Mu | 2016 | Science China Chemistry2016，59，5： | 6 |
| 4 | Effect of Heat Treatment on the Microwave Electromagnetic Properties of Carbonyl Iron/Epoxy-Silicone Resin Coatings显示文摘Microwave absorbing properties of the carbonyl iron particles filled epoxy-silicone resin coatings showed visible degression when the coatings were heat treated at 300 ℃ with different time.The complex permittivity and permeability of the coatings before and after heat treatment were measured.After heat treatment at 300 ℃,the real part of permittivity of the coatings increased with increasing treatment time and showed frequency dependence dielectric response.The complex permeability showed remarkable variation while the resonance frequency of the coatings heat treated at 300 ℃ shifted from 7 to 12 GHz.The electromagnetic results indicated that microwave absorbing properties of the coatings showed more dependent on the complex permeability.The results showed that the difference of the electromagnetic and microwave absorbing properties before and after heat treatment was mainly attributed to the crystalline state transition of carbonyl iron particles. | Yuchang Qing,Wancheng Zhou,Shu Jia,Fa Luo and Dongmei Zhu State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi an 710072,China | 2010 | Journal of Materials Science & Technology2010，26，11： | 6 |
| 5 | The origin of sulfuryl-containing components in SEI from sulfate additives for stable cycling of ultrathin lithium metal anodes显示文摘In the light of wireless and non-fossil society based on portable electronics, electric vehicles, and smart grids, secondary batteries with higher energy density, faster charge, and safer operation are pursued persistently [1]. Nowadays, commercial lithium(Li)-ion batteries have been practically applied in our daily life. However,the energy density of Li-ion batteries based on intercalation chemistry is approaching to the theoretical value due to the limited specific capacity of graphite anode(372 mA h g-1) [2]. | Jin-Xiu Chen Xue-Qiang Zhang Bo-Quan Li Xin-Meng Wang Peng Shi Wancheng Zhu Aibing Chen Zhehui Jin Rong Xiang Jia-Qi Huang Qiang Zhang | 2020 | Journal of Energy Chemistry2020，29，8： | 5 |
| 6 | Delta Shocks and Vacuum States in Vanishing Pressure Limits of Solutions to the Relativistic Euler Equations显示文摘The Riemann problems for the Euler system of conservation laws of energy and momentum in special relativity as pressure vanishes are considered. The Riemann solutions for the pressureless relativistic Euler equations are obtained constructively. There are two kinds of solutions, the one involves delta shock wave and the other involves vacuum. The authors prove that these two kinds of solutions are the limits of the solutions as pressure vanishes in the Euler system of conservation laws of energy and momentum in special relativity. | Gan YIN Wancheng SHENG | 2008 | Chinese Annals of Mathematics,Series B2008，29，6： | 4 |
| 7 | Molecular cloning and differential expression patterns of the regulatory subunit B' gene of PP2A in goldfish,Carassius auratus显示文摘It is well established that the protein serine/threonine phosphatase 2A(PP2A) plays very important roles in many different cellular processes,including cell proliferation and differentiation,gene expression,neurotransmission,apoptosis,and aging.PP2A consists of three heterogenic subunits:the scaffold subunit A,the catalytic subunit C,and the regulatory subunit B.While both the scaffold and the catalytic subunits contain only two forms,at least four families of the regulatory subunits,B,B',B'',and B''' have been identified.These regulatory subunits from different families are encoded by different genes and bear other functions besides directing the specificity of PP2A.To study the functions of the regulatory subunits of PP2A in lower vertebrates,we have cloned the full-length cDNA sequence of the gene encoding the regulatory subunit B'δ of PP2A from gold fish,Carassius auratus using 3'-RACE and 5'-RACE cloning strategies.Our results revealed that the full-length B'δ cDNA contains 2415 bp and encodes a protein of 555 amino acids.The B'δ protein displays a very high level of sequence identity with the B'δ regulatory subunit from other species of vertebrates.Regarding its expression pattern,RT-PCR revealed that the highest level of mRNA was detected in brain,a less level detected in liver,spermary,ovary,kidney and gill,and the lowest level detected in the fin.During different developmental stages of gold fish,the highest level of mRNA expression was detected at the stages of two-cell,multiple-cell,blastula and gastrula,and a decreased level of B'δ mRNA was detected in other developmental stages.At the protein level,the highest expression level of B'δ protein was found in spermary,ovary,brain and heart,a less amount found in liver and the lowest level detected in kidney,gill and fin.Developmentally,B'δ protein was strongly expressed at the stages of two-cell,multiple-cell,blastula,gastrula,neurula,and optic vesicle,and then decreased at the stages of brain differentiation and eye pigmentation.These results suggest that B'δ appears to play a very important role during gold fish development and also in adult tissue homeostasis. | LI David WanCheng | 2009 | Science China(Life Sciences)2009，52，8： | 4 |
| 8 | The Non-selfsimilar Riemann Problem for 2-D Zero-Pressure Flow in Gas Dynamics显示文摘为在有一条凸的曲线分开的二个经常的状态的煤气的动力学的二维的零压力的流动的 non-selfsimilar Riemann 问题被考虑。借助于概括 Rankine-Hugoniot 关系;概括典型分析方法,包含三角洲冲击波的全球答案;真空被构造。一种特殊情况的明确的解决方案也被给。 | Wenhua SUN Wancheng SHENG | 2007 | Chinese Annals of Mathematics,Series B2007，28，6： | 4 |
| 9 | Dielectric Properties of Porous Reaction-boned Si_3N_4 Ceramics with Controlled Porosity and Pore Size显示文摘这篇论文论述反应的微波电介质性质有变体孔和毛孔的结合的多孔的氮化矽陶艺缩放粉末,它被增加形成毛孔的代理人谷物进硅准备。绝缘的常数和样品的绝缘的损失与在样品增加孔显然减少的试验性的结果表演。当孔是不变的时,当毛孔尺寸增加,绝缘的常数和陶艺的绝缘的损失显然减少。在所有获得的样品之中,最小的绝缘的常数是大约 2.4。 | Jie XU Dongmei ZHU Fa LUO Wancheng ZHOU Peng LI | 2008 | Journal of Materials Science & Technology2008，24，2： | 3 |
| 10 | Physicochemical characterization of gum from tamarind seed: Potential for pharmaceutical application显示文摘Tamarind(Tamarindus indica Linn.)is a topical plant that is generally found and planted in Thailand.Application of tamarind seed gum can increase the value of tamarind and minimize the industrial waste[1].Tamarind seed gum powder offers high viscosity solution.Therefore,researchers are interested in developing tamarind seed gum as binder in formulation of diclofenac sodium tablet,prepared by dry granulation method. | Kampanart Huanbutta Tanikarn Sangnim Wancheng Sittikijyothin | 2016 | Asian Journal of Pharmaceutical Sciences2016，11，1： | 2 |
| 11 | Hierarchical porous MgBO_2(OH) microspheres: Hydrothermal synthesis,thermal decomposition, and application as adsorbents for Congo red removal显示文摘A facile eco-friendly hydrothermal route(180 °C, 12.0 h) has been developed for the first time to the uniform hierarchical porous MgBO_2(OH) microspheres without the aid of any organic additive, surfactant or template, by using the abundant MgCl_2·6 H_2 O, H_3BO_3 and NaOH as the raw materials. The as-obtained porous microspheres exhibit a specific surface area of 94.752 mg·g^(-1), pore volume of 0.814 cm3·g^(-1), and ca. 84.0% of which have a diameter of 2.25–3.40 μm. The thermal decomposition of the porous MgBO_2(OH) microspheres(650 °C,2.5 °C·min^(-1)) leads to the porous Mg_2B_2O_5 microspheres with well-retained morphology. When utilized as the adsorbents for the removal of CR from mimic waste water, the present porous MgBO_2(OH) microspheres exhibit satisfactory adsorption capacity, with the maximum adsorption capacity q^(-1) mof 309.1 mg·g, much higher than that derived from most of the referenced adsorbents. This opens a new window for the facile green hydrothermal synthesis of the hierarchical porous MgBO_2(OH) microspheres, and extends the potential application of the 3 D hierarchical porous metal borates as high-efficiency adsorbents for organic dyes removal. | Panpan Sun Liyuan Chen Lin Xu Wancheng Zhu | 2018 | Chinese Journal of Chemical Engineering2018，26，7： | 2 |
| 12 | Design and characterization of clindamycin-loaded nanofiber patches composed of polyvinyl alcohol and tamarind seed gum and fabricated by electrohydrodynamic atomization显示文摘In this study, we developed a polymeric nanofiber patch(PNP) for topical disease treatment using electrohydrodynamic atomization(EHDA). The nanofibers were prepared using various concentrations of polyvinyl alcohol(PVA) and tamarind seed gum and loaded with clindamycin HCl as a model drug. The precursor polymer solutions were sprayed using the EHDA technique; the EHDA processing parameters were optimized to obtain blank and drug-loaded PNPs. The skin adherence, translucence, and ventilation properties of the prepared PNPs indicated that they are appropriate for topical application. The conductivity of the polymer solution increased with increasing PVA and clindamycin concentrations, and increasing the PVA concentration enhanced the solution viscosity. Based on scanning electron microscopy analysis, the PVA concentration had a pronounced effect on the morphology of the sprayed product. Nanofibers were fabricated successfully when the solution PVA concentration was 10%, 13%, or 15%(w/v). The applied voltage significantly affected the diameters of the prepared nanofibers, and the minimum nanofiber diameter was 163.86 nm. Differential scanning calorimetry and X-ray diffraction analyses indicated that the modeldrug was dispersed in PVA in an amorphous form. The PNP prepared with a PVA:gum ratio of 9:1 absorbed water better than the PVA-only PNP and the PNP with a PVA:gum ratio of 9.5:0.5. Moreover, the PNPs loaded with clindamycin at concentrations of 1%–3% prohibited the growth of Staphylococcus aureus more effectively than clindamycin gel, a commercially available product. | Tanikan Sangnim Sontaya Limmatvapirat Jurairat Nunthanid Pornsak Sriamornsak Wancheng Sittikijyothin Sumaleea Wannachaiyasit Kampanart Huanbutta | 2018 | Asian Journal of Pharmaceutical Sciences2018，13，5： | 2 |
| 13 | Experimental study on the effect of granular backfill with various gradations on the mechanical behavior of rock显示文摘Backfilling is a common practice in the mining industry and the backfilling performance plays a significant role in supporting the surrounding rock mass.To evaluate the backfilling performance,an experimental apparatus has been developed to understand how backfill affects the compressive strength of sandstone specimens in the laboratory.Pebbles were selected to model the backfill and divided into six groups with different particle sizes using a set of standard sieves.The backfilling pebbles with three types of particle size compositions were then produced,i.e.single gradation,two adjacent gradations,and increasingly widening gradations.A series of compressive tests were carried out to study the mechanical behavior of the sandstone specimens confined by these pebbles.The effects of the gradations of the filled pebbles on the peak and residual compressive strengths were analyzed.It is found that the increasing amount of the compressive strength is over 10%in most cases,even up to 20%.Based on the experiment data,the increasing amount was also estimated theoretically under some assumptions and it further confirmed the experimental results.The effects are closely related to the gradations of the filled pebbles except for their dense degree. | Zhihua Le Qinglei Yu Wancheng Zhu Hongyuan Liu Tianhong Yang | 2021 | International Journal of Mining Science and Technology2021，31，5： | 2 |
| 14 | Preparation and Dielectric Properties of Nonstoichiometric β-SiC Powder by Combustion Synthesis显示文摘The nonstoichiometric β-SiC powders were synthesized via combustion reaction of Si and C system in a 0.1 MPa nitrogen atmosphere, using Teflon as the chemical activator. The prepared powders were invistigated by XRD and Raman spectra. The results indicates that the cell parameters of all the prepared β-SiC powder are smaller than the standard value of β-SiC because of generation of CSi defects. The complex permittivity of prepared products was carried out in the frequency range of 8.2-12.4 GHz. It shows that the dielectric property of prepared β-SiC powder decrease with increasing PTFE content. The effect of CSi defects on dielectric property of β-SiC powder has been discussed. | Xiaolei Su Wancheng Zhou Zhimin Li Fa Luo Dongmei Zhu | 2009 | Journal of Materials Science & Technology2009，25，3： | 2 |
| 15 | Value of big data to finance:observations on an internet credit Service Company in China显示文摘Background:his paper presents a case study on 100Credit,an Internet credit service provider in China.100Credit began as an IT company specializing in e-commerce recommendation before getting into the credit rating business.The company makes use of Big Data on multiple aspects of individuals’online activities to infer their potential credit risk.Methods:Based on 100Credit’s business practices,this paper summarizes four aspects related to the value of Big Data in Internet credit services.Results:1)value from large data volume that provides access to more borrowers;2)value from prediction correctness in reducing lenders’operational cost;3)value from the variety of services catering to different needs of lenders;and 4)value from information protection to sustain credit service businesses.Conclusion:The paper also discusses the opportunities and challenges of Big Databased credit risk analysis,which needs to be improved in future research and practice. | Shaofeng Zhang Wei Xiong Wancheng Ni Xin Li | 2015 | Financial Innovation2015，1，1： | 2 |
| 16 | Application of low-emissivity Pt layer on Ni alloy to high temperature显示文摘Platinum films were sputter-deposited on two groups of nickel alloy substrates,in which the first group was the samples with rough surface,and the other group with polished surface.The platinum thin-films were applied to serve as the low-emissivity layers to reflect thermal radiation.Then,the platinum-coated samples were heated in air at 600℃ for 200 h to explore the effect of high-temperature environment on the emissivity of coated platinum film.After annealing,the average IR emissivity(at the wavelength of 3-14 μm) of the platinum film was only about 0.1 for polished sample and 0.45 for rough sample.The diffusion between platinum and the nickelalloy elements at 600℃ had been also discussed. | Zhibin HUANG Wancheng ZHOU Xiufeng TANG | 2010 | Acta Metallurgica Sinica(English Letters)2010，23，1： | 2 |
| 17 | Microwave electromagnetic properties of carbonyl iron particles and Si/C/N nano-powder filled epoxy-silicone coating显示文摘 | Yuchang Qing Wancheng Zhou Fa Luo Dongmei Zhu | 2009 | Physica B: Physics of Condensed Matter2009，，4： | 1 |
| 18 | Perovskite lithium and bismuth modified potassium-sodium niobium lead-free ceramics for high temperature applications 显示文摘 | DU Hongliang ZHOU Wancheng LUO Fa | 2007 | Appl Phys Lett2007，91，18： | 1 |
| 19 | Hydrothermal mass production of MgBO2 (OH) nanowhiskers and subsequent thermal conversion to Mg2B2Os nanorods for biaxially oriented polypropylene resins reinforcement 显示文摘 | ZHU Wancheng LI Guangdong ZHANG Qiang | 2010 | Powder Technology2010，203，2： | 1 |
| 20 | Microwave electromagnetic property of SiO 2 -coated carbonyl iron particles with higher oxidation resistance显示文摘 | Qing Yuchang Zhou Wancheng Jia Shu Luo Fa Zhu Dongmei | 2010 | Physica B: Physics of Condensed Matter2010，，4： | 1 |
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