检索结果-南通市图书馆

Journal of Iron and Steel Research International 2022年第2期29卷 187-206页

作者： Zhi-ming Yan Xue-wei lv Zu-shu Li WMG University of WarwickCoventryCV47ALUK School of Materials Science and Engineering Chongqing UniversityChongqing400044China

The titanium industry can hardly bypass the titania-containing slags,and the slag physicochemical properties are essential in the metallurgical reactor design and process *** TiO_(2)–FeO-based slags and TiO_(2)–SiO_(2)–CaO-based slags are the main metallurgical slag systems in the titanium resource utilization *** elaborate the role of TiO_(2) in the physicochemical properties of titania-containing metallurgical slags,the physicochemical properties including titanium redox ratio,liquidus temperature,viscosity,electrical conductivity,density,surface tension,thermal conductivity,and sulfide capacity were critically ***,the property prediction models were briefly introduced with regards to the limitations of the existing *** property prediction models are still required to evolve since not all properties of titania-containing slags can be well *** the slag structure has an intimate relationship with slag properties,the structural details of the titania-containing slag were investigated by using a combination of spectroscopic technologies,but the knowledge of the slag structure was not fully *** potential research fields related to the physicochemical properties and structure of the titania-containing slags were also suggested.

关键词： Titania-containing slag Physicochemical property Prediction model Slag structure

Release characteristics of different diameter ultrafine fibers as antibacterial materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2021年第2期4卷 1-10页

作者： Zhiqiang wei Erniao Liu Hao Li Zhimei wei Zhi lv Department of Orthopaedics Shanxi Medical University Second Hospital Taiyuan 030001P.R.China Institute of Materials Science and Technology Sichuan University Chengdu 610065P.R.China

Although the electrospinning technique has been devoted to promoting therapeutic purposes as a drug carrier,however,there are still many fundamental problems in this *** work focuses on a comparison of various diameter polyethersulfone(PES)electrospun ultrafine fibers as an-timicrobial *** fibrous morphology,antimicrobial agent distribution,thermally property,and biocompatibility evaluation of PES-based ultrafine fibers were systematically *** results demonstrated that the PES-based ultrafine fibers were suitable as anti-microbial ***,the drug release behavior and mechanism were studied through total *** release mechanism was confirmed to Fickian *** was revealed that the drug max release amount(71.5%)and release rate(7.71)are the highest for the smallest diameter ultrafine ***,the antimicrobial activity of PES ultrafine fibers is also inversely correlated with the diameter of *** electrospun PES fibers would control their release behavior through the diameter and have a potential application in the wound dressings,such as chronic osteomyelitis and exposure injury.

关键词： Electrospinning polyethersulfone ultrafine fibers drug release antimicrobial activity

Influence of element substitutions on poisoning behavior of ZrV_(2)alloy:theoretical and experimental investigations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第7期34卷 253-266页

作者： Shuang Yang Run-Jie Fang Guo Yang Li-jun lv Xing-Bo Han wei Liu Xiu-Jie He Peng-Fei Zhu School of Mathematics Physics and StatisticsShanghai University of Engineering ScienceShanghai 201620China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China China Nuclear Power Technology Research Institute Co.Ltd Shenzhen 518000China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

A ZrV_(2)alloy is typically susceptible to poisoning by impurity gases,which causes a considerable reduction in the hydrogen storage properties of the *** this study,the adsorption characteristics of oxygen on ZrV_(2)surfaces doped with Hf,Ti,and Pd are investigated,and the effect of oxygen on the hydrogen storage performance of the alloy was ***,the adsorption energy,bond-length change,density of states,and differential charge density of the alloy before and after doping are analyzed using the first-principles *** theoretical results show that Ti doping has a limited effect on the adsorption of oxygen atoms on the ZrV_(2)surface,whereas Hf doping decreases the adsorption energy of oxygen on the ZrV_(2)*** atoms are more difficult to adsorb at most adsorption sites on Pd-substituting surfaces,which indicates that Pd has the best anti-poisoning properties,followed by *** analysis of the differential charge density and partial density of states show that the electron interaction between the oxygen atom and surface atom of the alloys is weakened,and the total energy is reduced after Hf and Pd *** on theoretical calculations,the hydrogen absorption kinetics of ZrV_(2),Zr_(0.9)Hf_(0.1)V_(2),and Zr(V_(0.9)Pd_(0.1))_(2) alloys are studied in a hydrogen-oxygen mixture of 0.5 vol%O_(2) at 25℃.The experimental results show that the hydrogen storage capacities of ZrV_(2),Zr_(0.9)Hf_(0.1)V_(2),and Zr(V_(0.9)Pd_(0.1))_(2) decrease to 19%,69%,and 80%of their original values,*** order of alloy resistance to 0.5 vol%O_(2) poisoning is Zr(V_(0.9)Pd_(0.1))_(2)>Zr_(0.9)Hf_(0.1)V_(2)>ZrV_(2).Pd retains its original hydrogen absorption performance to a greater extent than undoped surfaces,and it has the strongest resistance to poisoning,which is consistent with previous theoretical calculations.

关键词： Hydrogen storage ZrV_(2) First-principles Poisoning effect

Index-free triangle-based graph local clustering

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 143-153页

作者： Zhe YUAN Zhewei wei Fangrui lv Ji-Rong WEN The Country and Area Studies Academy Beijing Foreign Studies UniversityBeijing 100089China Gaoling School of Artificial Intelligence Renmin University of ChinaBeijing 100872China

Motif-based graph local clustering(MGLC)is a popular method for graph mining tasks due to its various ***,the traditional two-phase approach of precomputing motif weights before performing local clustering loses locality and is impractical for large *** some attempts have been made to address the efficiency bottleneck,there is still no applicable algorithm for large scale graphs with billions of *** this paper,we propose a purely local and index-free method called Index-free Triangle-based Graph Local Clustering(TGLC^(*))to solve the MGLC problem w.r.t.a ***^(*)directly estimates the Personalized PageRank(PPR)vector using random walks with the desired triangleweighted distribution and proposes the clustering result using a standard sweep *** demonstrate TGLC^(*)’s scalability through theoretical analysis and its practical benefits through a novel visualization ***^(*)is the first algorithm to solve the MGLC problem without precomputing the motif *** experiments on seven real-world large-scale datasets show that TGLC^(*)is applicable and scalable for large graphs.

关键词： graph local clustering triangle motif index-free sampling method visualization

Quantum conformational transition in biological macromolecule

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Electrical and Electronic Engineering in China 2017年第2期5卷 143-158页

作者： Liaofu Luo jun lv School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China Center for Physics Experiment College of Science Inner Mongolia University of Technology Hohhot 010051 China

Background： Recently we proposed a quantum theory on the conformational change of biomolecule, deduced several equations on protein folding rate from the first principles and discussed the experimental tests of the theory. The article is a review of these works. Methods： Based on the general equation of the conformation-transitional rate several theoretical results are deduced and compared with experimental data through bioinformatics methods. Results： The temperature dependence and the denaturant concentration dependence of the protein folding rate are deduced and compared with experimental data. The quantitative relation between protein folding rate and torsional mode number （or chain length） is deduced and the obtained formula can be applied to RNA folding as well. The quantum transition theory of two-state protein is successfully generalized to multi-state protein folding. Then, how to make direct experimental tests on the quantum property of the conformational transition of biomolecule is discussed, which includes the study of protein photo-folding and the observation of the fluctuation of the fluorescence intensity emitted from the protein folding/unfolding event. Finally, the potential applications of the present quantum folding theory to molecular biological problems are sketched in two examples： the glucose transport across membrane and the induced pluripotency in stem cell. Conclusions： The above results show that the quantum mechanics provides a unifying and logically simple theoretical starting point in studying the conformational change of biological macromoleeules. The far-reachlng results in practical application of the theory are expected.

关键词： conformational change quantum transition protein folding RNA folding temperature dependence

Ligand dose-dependent activation of signaling pathways through the gustatory receptor NlGr11 linked to feeding efficacy in Nilaparvata lugens

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Insect Science 2023年第5期30卷 1420-1430页

作者： wei-Wen Chen Kai Lin jun lv Qin Su Meng-Yi Zhang Kui Kang Wen-Qing Zhang State Key Laboratory of Biocontrol and School of Life Sciences Sun Yat-sen UniversityGuangzhouChina College of Biology and Agriculture Zunyi Normal UniversityZunyiGuizhou ProvinceChina

Insects often face both conditions with sufficient nutrients and conditions of undernutrition in the *** gustatory receptors,insects sense nutrients and regulate their physiological functions such as feeding and ***,it remains unclear whether signaling pathways activated by gustatory receptors depend on the concentration of nutrients and whether the difference in signaling pathways directly affects insects’physiological ***,we found that a sugar gustatory receptor,NlGr11,from the brown planthopper(BPH),Nilaparvata lugens,activated G protein-coupled signaling and ionotropic pathways when bound to high galactose *** subsequently demonstrated longer feeding times,feeding loads,and higher vitellogenin(Nlvg)expression than BPHs exposed to high galactose concentrations,which only activated the ionotropic *** the first time,our findings link plant nutrient conditions,signaling pathways activated by nutrients,and their gustatory receptors,and nutrient dose-dependent feeding efficacy and vitellogenin(Vg)expression in an *** will help us to better understand the molecular mechanism for insect feeding strategies on plants at different stages of nutritional conditions.

关键词： feeding efficacy galactose G protein-coupled signaling pathway insect gustatory receptor ionotropic pathway

RNAi technology: A Revolutionary tool for the colorectal cancer therapeutics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第29期12卷 4636-4639页

作者： wei lv Chao Zhang Jia Hao Department of General Surgery Southwest Hospital The Third Military Medical UniversityChongqing 400038 China

With the many changes that have taken place in people＇s diet and lifestyle, colorectal cancer （CRC） has become a global concern. There were approximately 950000 new cases diagnosed and 500000 deaths recorded worldwide in 2000. It is the second most common type of cancer in the Western world, and it is the third most common type of digestive tumor in China. It is reported that the morbidity of CRC is 4.08/100000 for men and 3.30/100000 for women in China. Despite the rate of improvements in surgery, radiotherapy and chemotherapy, the overall five-year survival is around 50%. Therefore, novel treatment need to be developed in order to add to the therapeutic armamentarium. RNA interference （RNAi） is a sequence-specific posttranscriptional gene silencing mechanism, which is triggered by double-stranded RNA （dsRNA） and causes degradation of mRNA homologous in sequence to the *** new approach has been successfully adopted to inhibit virus replication and tumorigenicity. Recent reports have described DNA vector-based strategies for delivery of small interfering RNA （siRNA） into mammalian cells, further expanding the utility of RNAi. With the development of the RNAi technology and deeper understanding of this field, a promising new modality of treatment appeared, which can be used in combination with the existing therapies .We reviewed the proceedings on the actualities and advancement of RNAi technology for colorectal cancer therapeutics.

关键词： RNAi Colorectal cancer Therapeutics

定向电场下W_(6)C_(6)团簇的超卤素调制及非线性光学特性

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第3期42卷 72-76页

作者：蔡璧钧段宇静魏强重庆理工大学理学院重庆400050

本文采用密度泛函(DFT)方法研究了定向外电场(OEEF)对W_(6)C_(6)团簇几何结构、电子性质以及非线性光学响应(NLO)的影响.计算结果表明W_(6)C_(6)的结构在一定OEEF强度下可以保持稳定.OEEF可以增大W_(6)C_(6)团簇的电子亲和能(EA值),且... 详细信息

本文采用密度泛函(DFT)方法研究了定向外电场(OEEF)对W_(6)C_(6)团簇几何结构、电子性质以及非线性光学响应(NLO)的影响.计算结果表明W_(6)C_(6)的结构在一定OEEF强度下可以保持稳定.OEEF可以增大W_(6)C_(6)团簇的电子亲和能(EA值),且在特定强度下,OEEF可以将W_(6)C_(6)团簇转变为超卤素.通过对EA值的非线性拟合可以实现对W_(6)C_(6)团簇的连续调制.进一步对不同外电场下W_(6)C_(6)团簇的最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)能级进行分析,发现OEEF降低了W_(6)C_(6)团簇LUMO能级是其EA值增大的主因.此外,OEEF可以显著增大W_(6)C_(6)团簇的平均极化率和第一超极化率,尤其是第一超极化率,改变其非线性光学性质.

关键词：定向外电场超原子密度泛函理论 NLO W_(6)C_(6)团簇

Deposition of thin TiO_(2)films on fluorophlogopite particle surface by CVD in fluidized bed reactor to prepare silver pearlescent pigments

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第6期89卷 88-98页

作者： Ming Liu Guoqiang Shao Pengpeng lv jun Li Qingshan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Two critical parameters:Glossiness and chromaticity space of pearlescent pigments were evaluated based on crystallinity and grain *** the roughness and the vertical distance evolution along the surface of deposited TiO_(2)film are affected by the *** optimal crystallinity of TiO_(2)was deposited at the temperature of 350℃.The TiCl4 concentration effectively changed the grain ***,the high flow rate of fluidizing gas and optimal gas–solid ratio(lver pearlescent pigment with high glossiness was prepared by chemical vapor deposition method in a fluidized bed reactor.

关键词： Fluidized bed chemical vapor deposition TiO_(2)film deposition Pearlescent pigment Free powder restrain Crystal growth