检索结果-南通市图书馆

Quasi-delta negative ions density of Ar/O_(2)inductively coupled plasma at very low electronegativity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第5期30卷 460-483页

作者： shu-Xia zhao Key Laboratory of Material Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China

One of the novel phenomena of Ar/O_(2)inductively coupled plasma,the delta negative ions density profile is discovered by the fluid simulation at very low *** anions delta is found to be formed by the collaboration of successive plasma transport *** plasma transport itself is affected by the delta,exhibiting many new phenomena.A new type of Helmholtz equation is devised to mathematically explain the delta forming *** revealing the physics behind,a revised spring oscillator dynamic equation has been constructed according to the Helmholtz equation,in a relevant paper[zhao S X and Li J Z(2021)***.B 30055202].The investigation about the anions delta distribution is a nice prediction of new phenomenon in low temperature electronegative plasmas,waiting for the validation of related experiments.

关键词： inductively coupled plasma Ar/O_(2)discharge very low electronegativity delta distribution of anions

Gas flow characteristics of argon inductively coupled plasma and advections of plasma species under incompressible and compressible flows

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第12期27卷 348-360页

作者： shu-Xia zhao zhao Feng Physics Department Dalian University of Technology

In this work, incompressible and compressible flows of background gas are characterized in argon inductively coupled plasma by using a fluid model, and the respective influence of the two flows on the plasma properties is specified. In the incompressible flow, only the velocity variable is calculated, while in the compressible flow, both the velocity and density variables are calculated. The compressible flow is more realistic; nevertheless, a comparison of the two types of flow is convenient for people to investigate the respective role of velocity and density variables. The peripheral symmetric profile of metastable density near the chamber sidewall is broken in the incompressible flow. At the compressible flow, the electron density increases and the electron temperature decreases. Meanwhile, the metastable density peak shifts to the dielectric window from the discharge center, besides for the peripheral density profile distortion, similar to the incompressible *** velocity profile at incompressible flow is not altered when changing the inlet velocity, whereas clear peak shift of velocity profile from the inlet to the outlet at compressible flow is observed as increasing the gas flow rate. The shift of velocity peak is more obvious at low pressures for it is easy to compress the rarefied gas. The velocity profile variations at compressible flow show people the concrete residing processes of background molecule and plasma species in the chamber at different flow rates. Of more significance is it implied that in the usual linear method that people use to calculate the residence time, one important parameter in the gas flow dynamics, needs to be rectified. The spatial profile of pressure simulated exhibits obvious spatial gradient. This is helpful for experimentalists to understand their gas pressure measurements that are always taken at the chamber outlet. At the end, the work specification and limitations are listed.

关键词： gas flow inductively coupled plasma compressible flow fluid model

Light-controlled phosphorylation in the TrkA-Y785 site by photosensitive UAAs activates the MAPK/ERK signaling pathway

在线全文

学校读者我要写书评

暂无评论

BIOCELL 2023年第6期47卷 1377-1388页

作者： shu zhao SHIXIN YE School of Life Sciences Nantong UniversityNantong226019China Institute National de la Sante et de la Recherche Medicale(INSERM)U1195 Bicetre HospitalParis-Saclay UniversityLe Kremlin-Bicêtre94276France

Background:This paper aims to establish a light-controlled phosphorylation detection method at the Y785 site of tropomyosin receptor kinase A(TrkA)receptor in mammalian cells by using genetic code expansion technology and detecting the effects of optical activation of this site on the downstream MAPK/ERK *** study is based on the current situation that the regulatory mechanism of TrkA phosphorylation has not been fully ***:Two photosensitive unnatural amino acids,p-azido-L-phenylalanine(AzF)and photo-caged tyrosine(ONB)were introduced into the TrkA-Y785 site by genetic code expansion technology and site-directed *** blotting and laser confocal imaging were conducted to analyze the effects of this site on activating the MAPK/ERK pathway and nerve cell differentiation before and after ***:Our results supplemented the light-controlled results of the TrkA-Y785 site based on our previous research and verified that Y785 also makes important contributions in regulating the MAPK/ERK ***:This study demonstrated the significant contributions of the TrkAY785 site in regulating the ERK pathway by precisely controlling the phosphorylation state of a single tyrosine site.

关键词： Tropomyosin receptor kinase A Genetic code expansion Y785 P-azido-L-phenylalanine Photo-caged tyrosine

Symmetry-breaking of LiMn_(6) hexatomic-ring in grain surface of Li_(2)MnO_(3)

维普期刊数据库评论

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 Energy Chemistry 2023年第6期81卷 110-117,I0004页

作者： Lihang Wang shu zhao Boya Wang Haijun Yu Institute of Advanced Battery Materials and Devices Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China

LiMn_(6) hexatomic-rings act as functional units in Li-rich layered oxides(LLOs),which determine the capacity,voltage,and structural stability of ***,the symmetry of the LiMn_(6) hexatomic-ring is always broken,especially in the grain surface of LLOs,which will greatly affect its electrochemical ***,the symmetry-breaking of LiMn_(6) hexatomic-ring in the grain surface of Li_(2)MnO_(3) was studied,and their effect on charge compensation mechanism and structure evolution behavior was thoroughly *** results show that the electrochemical activity of the symmetry-broken LiMn_(6) hexatomic-ring is higher than that of the unbroken LiMn_(6),and the former is more favorable for spinelization on the grain ***,the exposure proportion of crystallographic planes with different symmetry-broken LiMn_(6) hexatomic-ring has also been discussed,which can be adjusted by changing the partial pressure of *** in-depth understanding of the symmetry-breaking of LiMn_(6) hexatomic-ring will provide more targeted strategies for designing high-performance LLOs cathodes for lithium-ion batteries.

关键词： Li-rich layered oxides LiMn_(6)functional unit Symmetry-breaking Surface structure Density functional theory

Regularity for P-Harmonic Type Systems with the Gradients below the Controllable Growth

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2006年第6期22卷 1757-1766页

作者： Shen Zhou ZHENG shu Le zhao Department of Mathematics Beijing Jiaotong University Beijing 100044 P. R. China

In this paper, we shall establish that each weak solution of p-harmonic type systems with the gradients below the controllable growth belongs to, Holder continuity spaces with any HSlder exponent α∈ [0, 1）. Furthermore, we can obtain that the gradients of the corresponding weak solutions also belong to locally Hoelder continuity spaces with some Hoelder exponent. Keywords controllable growth, p-harmonic systems, full regularity MR（2000） Subject Classification 35J60, 35B65

关键词： controllable growth p-harmonic systems full regularity

Hierarchical Covering Algorithm

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2014年第1期19卷 76-81页

作者： Jie Chen shu zhao Yanping Zhang Department of Computer Science and Technology and Key Lab of Intelligent Computing and Signal Processing Anhui University

The concept of deep learning has been applied to many domains, but the definition of a suitable problem depth has not been sufficiently explored. In this study, we propose a new Hierarchical Covering Algorithm （HCA） method to determine the levels of a hierarchical structure based on the Covering Algorithm （CA）. The CA constructs neural networks based on samples＇ own characteristics, and can effectively handle multi-category classification and large-scale data. Further, we abstract characters based on the CA to automatically embody the feature of a deep structure. We apply CA to construct hidden nodes at the lower level, and define a fuzzy equivalence relation R on upper spaces to form a hierarchical architecture based on fuzzy quotient space theory. The covering tree naturally becomes from R. HCA experiments performed on MNIST dataset show that the covering tree embodies the deep architecture of the problem, and the effects of a deep structure are shown to be better than having a single level.

关键词： deep architecture hierarchy fuzzy equivalence relation covering tree MNIST dataset

MICkNN:Multi-Instance Covering kNN Algorithm

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2013年第4期18卷 360-368页

作者： shu zhao Chen Rui Yanping Zhang Department of Computer Science and Technology and Key Lab of Intelligent Computing and Signal Processing Anhui University

Mining from ambiguous data is very important in data mining. This paper discusses one of the tasks for mining from ambiguous data known as multi-instance problem. In multi-instance problem, each pattern is a labeled bag that consists of a number of unlabeled instances. A bag is negative if all instances in it are negative. A bag is positive if it has at least one positive instance. Because the instances in the positive bag are not labeled, each positive bag is an ambiguous. The mining aim is to classify unseen bags. The main idea of existing multi-instance algorithms is to find true positive instances in positive bags and convert the multi-instance problem to the supervised problem, and get the labels of test bags according to predict the labels of unknown instances. In this paper, we aim at mining the multi-instance data from another point of view, i.e., excluding the false positive instances in positive bags and predicting the label of an entire unknown bag. We propose an algorithm called Multi-Instance Covering kNN （MICkNN） for mining from multi-instance data. Briefly, constructive covering algorithm is utilized to restructure the structure of the original multi-instance data at first. Then, the kNN algorithm is applied to discriminate the false positive instances. In the test stage, we label the tested bag directly according to the similarity between the unseen bag and sphere neighbors obtained from last two steps. Experimental results demonstrate the proposed algorithm is competitive with most of the state-of-the-art multi-instance methods both in classification accuracy and running time.

关键词： mining ambiguous data multi-instance classification constructive covering algorithm kNN algorithm

Gate/Geant4-based Monte Carlo simulation for calculation of dose distribution of 400 MeV/u carbon ion beam and fragments in water

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第4期27卷 46-52页

作者： Hai-Feng Ou Bin Zhang shu-Jun zhao Physical Science and Technology College Zhengzhou University College of Science Henan University of Technology

The applications of carbon ion beam in tumor therapy have attracted more attention in recent *** Carlo simulation is an important approach to obtain accurate radiotherapy parameters. In this work, a400 Me V/u carbon ion beam incident on water phantom was simulated with Gate/Geant4 tools. In methods, the authors set up a carbon ion beam source according to the experiment parameters of Haettner, defined the geometries and materials, set up the physics processes, and designed the means of information collection. In results,the authors obtained the longitudinal dose distribution, the lateral dose distribution, and the relative uncertainty of dose. The dose contributions of all kinds of fragments were calculated detailedly and compared with the Francis results. This work is helpful for people's understanding of the dose distributions produced by carbon ion beam and fragments in water. The simulation method is also significative for radiotherapy treatment planning of carbon ion beam, and it is easy to extend. For obtaining a special result, we may change the particle energy, particle type,target material, target geometry, physics process, detector,etc.

关键词：蒙特卡罗模拟剂量分布碳离子束 MeV 水模蒙特卡洛仿真放射治疗几何形状

Integrating Factors and Conservation Theorems of Lagrangian Equations for Nonconservative Mechanical System in Generalized Classical Mechanics

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第1X期46卷 43-45页

作者： QIAO Yong-Fen zhao shu-Hong Department of Mechanical Engineering and Automation Zhejiang Science and Technology University Hangzhou 310018 China Engineering College of Northeast Agricultural University Harbin 150030 China

The conservation theorems of the generalized Lagrangian equations for nonconservative mechanical system are studied by using method of integrating factors. Firstly, the differential equations of motion of system are given, and the definition of integrating factors is given. Next, the necessary conditions for the existence of the conserved quantity are studied in detail. Finally, the conservation theorem and its inverse for the system are established, and an example is given to illustrate the application of the result.

关键词： generalized nonconservative system Lagrangian equation conservation theorem integrating factor