检索结果-南通市图书馆

Sparing lung tissue with virtual block method in VMAT planning for locally advanced non-small cell lung cancer

Nuclear Science and Techniques 2022年第4期33卷 136-150页

作者： Jia-Yun chen Da-Quan Wang Xiao-Dong Zhang Qi Fu Xue-Na Yan Kuo Men Jian-rong dai Nan Bi Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Department of Radiation Oncology State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineSun Yat-Sen University Cancer CenterGuangzhou 510060China Department of Radiation Physics The University of Texas MD Anderson Cancer CenterHoustonTXUSA

This study aimed to exploit a new virtual block method to spare normal lung tissue in VMAT planning for patients with locally advanced non-small cell lung cancer(LA-NSCLC).The previous method was used to manually restrict the angle of the beam passing through,which ignored the location and shape of large targets that varied between different slices and did not block the beamlets *** the previous method,this new virtual block method was used to block the beamlets when necessary by closing the multi-leaf collimator(MLC)at prerequisite *** algorithm for closing the MLC depended on the thickness of the beamlets passing through the lungs and avoided only the entrance radiation ***,this block can be automatically contoured.A retrospective study was performed to compare the VMAT plans with and without the virtual block method for 17 LANSCLC patients,named the block plan(B-plan)/non-block plan(N-plan).All cases were selected in this study because of the large tumor size and unmet dose constraints of the *** addition to the maximum dose constraint for the virtual block,B-plans adopted identical optimization parameters to N-plans for each *** two types of plans were compared in terms of dosimetric indices and plan *** results were statistically analyzed using the Wilcoxon nonparametric signed-rank test.B-plans have advantages in the following dosimetric metrics that have statistical significance(p<0.05):(1)lower V_(5)/V_(10)/D_(mean)/normal tissue complication probability(NTCP)of total lungs;(2)reductions in V_(5)/V_(10)for the contralateral lung;(3)decrease in Dmean/V_(40)of the heart;(4)decrease in esophagus V_(40);(5)reductions in Dmean,V_(5)/V_(10) of normal tissue.B-plans(82.51±7.07)achieved higher-quality scores than N-plans(80.74±7.22).The new virtual block spared the lungs as well as other normal structures in VMAT planning for ***,the block method may decrease the risk of radiation-related toxicity in p

关键词： Virtual block VMAT Normal tissue sparing Lung cancer

来源：

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

Comparisons of EVD and DVD

引用

The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 74-78页

作者： YAN Ming dai Jian-hua HU Guo-rong GxSOC Research Institute Communication University of China Beijing 100024 P.R. China

The goal of the Enhanced Versatile Disc （EVD） standard is to define an advanced high definition disc competing with Digital Versatile Disc （DVD）. The EVD standard consists of the physical specification, the file system .specification, and the specification for audio/video data and Enhanced （ x ） Audio Coding （ExAC） technology. EVD is an integrated .system similar to DVD. Comprehensive comparisons of EVD and DVD are given in this paper. Their key differences include disc formats, file system structures, data structures, audio/video coding, and other issues. Among them, we emphasize on the logic structure of EVD data and its enhanced audio coding method ExAC. We can draw conclusions through these comparisons that EVD is more the advantageous.

关键词： EVD DVD logic structure ExAC MPEG-2

来源：

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

Achievements, challenges and prospects for the development of broadly protective multivalent vaccines and therapeutic antibodies against hand, foot and mouth disease

引用

Science Bulletin 2015年第15期60卷 1305-1315页

作者： Ke Lyu rong chen Key Laboratory of Molecular Virology and Immunology Institut Pasteur of Shanghai Chinese Academy of Sciences

Hand, foot and mouth disease(HFMD) is a significant health concern in the Asia–Pacific regions for infants and young children in recent years. However, no vaccines or therapeutics are available at present. The causative agents for HFMD include human enterovirus 71(EV71), coxsackievirus A16(CVA16) and some other viruses. Recently, tremendous progress has been made in the development of monovalent and bivalent vaccines against HFMD. A few neutralizing monoclonal antibodies against EV71 or CVA16 have been identified and characterized. Here, we reviewed some achievements for the development of broadly protective vaccines and neutralizing antibodies against HFMD, and discussed challenges and prospects toward broadly protective multivalent vaccines and therapeutic antibodies against HFMD.

关键词： Hand foot and mouth disease (HFMD) Human enterovirus 71 (EV71) Coxsackievirus A 16(CVAI6) - Vaccine Neutralizing antibodies

来源：

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

Knoevenagel condensation catalysed by poly(vinyl chloride) supported tetraethylenepentamine (PVC-TEPA)

引用

Chinese Chemical Letters 2007年第3期18卷 266-268页

作者： Fen Dong Yi Qun Li rong Feng dai Department of Chemistry Jinan University Guangzhou 510632 China

Poly（vinyl chloride） supported tetraethylenepentamine （PVC-TEPA） has been found to be an efficient catalyst for the Knoevenagel condensation. A wide range of aromatic aldehydes easily undergo condensations with ethyl cyanoacetate and malononitrile in the commercial 95% ethanol in refluxing using PVC-TEPA as catalyst to afford the desired products of good purity in moderate to excellent yields. A recycling study confirmed that the catalyst could be reused, the yield of the desired condensation product were not reduced. The merits of this protocol are environmentally benign, simple operation, convenient work-up and good yields. Furthermore, the catalyst can easily be recovered and reused at five times with comparable yields.

关键词： Knoevenagel condensation PVC-supported tetraethylenepentamine Catalysis

来源：

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

Genetic diversity and inferred ancestry of Asian lotus(Nelumbo nucifera) germplasms in Thailand and Vietnam

引用

Plant Diversity 2023年第1期45卷 69-79页

作者： Feng-Luan Liu Ya-Lan dai Thi Nga Hoang Vichai Puripunyavanich Primlarp Wasuwat Chukiatman Mi Qin Yan-rong Fu Yu-Chu chen dai-Ke Tian Shanghai Key Laboratory of Plant Functional Genomics and Resources Shanghai Chenshan Botanical GardenShanghai201602PR China Plant Resources Center Vietnam Academy of Agricultural SciencesHanoi100803Vietnam Thailand Institute of Nuclear Technology Bangkok10900Thailand Pang U Bon Waterlily Garden Muang NonthaburiNonthaburi11000Thailand Chinese Society of Landscape Architecture Beijing100835PR China Zhejiang Humanity Landscape Co. Ltd.HangzhouZhejiang310013PR China

Tropical lotus(Nelumbo) is an important and unique ecological type of lotus *** the genetic relationship and diversity of the tropical lotus is necessary for its sustainable conservation and *** 42 EST-SSR(expressed sequence tag-simple sequence repeats) and 30 SRAP(sequence-related amplified polymorphism) markers,we assessed the genetic diversity and inferred the ancestry of representative tropical lotus from Thailand and *** total,164 and 41 polymorphic bands were detected in 69 accessions by 36 EST-SSR and seven SRAP makers,*** genetic diversity was revealed in Thai lotus than in Vietnamese lotus.A Neighbor-Joining tree of five main clusters was constructed using combined EST-SSR and SRAP *** Ⅰ included 17 accessions of Thai lotus;cluster Ⅱ contained three Thai accessions and 11 accessions from southern Vietnam;and cluster Ⅲ was constituted by 13 accessions of seed *** with the results from the NeighborJoining tree,the genetic structure analysis showed that the genetic background of most Thai and Vietnamese lotus was pure,as artificial breeding has been rare in both ***,these analyses indicate that Thai and Vietnamese lotus germplasms belong to two different gene pools or *** lotus accessions are genetically related to geographical distribution patterns in Thailand or *** findings showed that the origin or genetic relationships of some unidentified lotus sources can be evaluated by comparing morphological characteristics and the data of molecular *** addition,these findings provide reliable information for the targeted conservation of tropical lotus and parent selection in breeding novel cultivars of lotus.

关键词： Aquatic plant Asian lotus EST-SSR Nelumbo Southeast Asia Tropical lotus

来源：

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

The Long-Sought-After Plant Heterochromatin Protein 1

引用

Molecular Plant 2019年第1期12卷 14-15页

作者： rong chen Molecular Plant

Heterochromatin,being transcriptionally inactive,is the highly condensed form of chromatin that is associated with Histone H3 lysine 9 methylation (H3K9me)and DNA methylation in eukaryotic *** fission yeast and animal... 详细信息

关键词： Heterochromatin H3K9me animals

来源：

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

Wall sheeting diagnosis in fluidized beds based on chaos analysis of acoustic emission signals

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1341-1349页

作者： Yi-jia CAO Jing-dai WANG Wei LIU Yong-rong YANG State Key Laboratory of Chemical Engineering Zhejiang University Hangzhou 310027 China Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China

A novel method, based on acoustic emission (AE) techniques, for detecting agglomeration in fluidized beds is presented. Particle size characteristics are determined based on the principle that AE signals with different frequency band energies are emitted when particles of different sizes impact an internal wall. By applying chaotic analysis to the AE signals, the malfunction coefficients are well defined. Agglomeration in the fluidized bed can then be detected by the sudden variation of malfunction coefficients. AE signals were investigated in a laboratory scale heated fluidized bed and an industrial polyethylene fluidized bed. Experimental data showed that the malfunction coefficients increased with the growth of agglomeration. The results indicated that agglomeration in fluidized beds can be predicted and diagnosed effectively and precisely using AE techniques based on chaotic analysis.

关键词： Acoustic emission (AE) Fluidized bed Malfunction coefficient Agglomeration Chaos

来源：

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

CFD modeling using heterogeneous reaction kinetics for catalytic dehydrogenation syngas reactions in a fixed-bed reactor

引用

Particuology 2013年第6期11卷 703-714页

作者： Xiaomin chen Jiu dai Zhenghong Luo Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen University

A comprehensive 2D computational fluid dynamics （CFD） model was developed to simulate the flow behavior and catalytic dehydrogenation reaction of syngas in a heterogenous fixed-bed reactor （FBR）. The model combined the porous medium CFD model with a reaction kinetics model. To acquire an accu- rate reaction kinetics model, a comprehensive reaction mechanism was studied for the heterogeneous catalytic dehydrogenation reaction ofsyngas over a supported metal catalyst. Based on the reaction mech- anism and a statistical test, a reliable kinetics model was proposed. The CFD model combined with the above kinetics model was validated with one set of experimental data. The CFD model was also used to predict key reaction variable distributions such as the temperature and the component concentrations in the reactor.

关键词： Reaction engineering Multiphase reactor Packed bed Kinetics CFD Syngas dehydrogenation

来源：

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

Hydrophobic interaction membrane chromatography for bioseparation and responsive polymer ligands involved

引用

Frontiers of Materials Science 2017年第3期11卷 197-214页

作者： Jingling chen rong PENG Xiaonong chen Beijing Laboratory of Biomedical Materials College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China

Hydrophobic interaction chromatography （HIC） is a rapid growing bioseparation technique, which separates biomolecules, such as therapeutic proteins and antibodys, based on the reversible hydrophobic interaction between immobilized hydrophobic ligands on chromatographic resin spheres and non-polar regions of solute molecule. In this review, the fundamental concepts of HIC and the factors that may affect purification efficiency of HIC is summarized, followed by the comparison of HIC with affinity chromatography and ion-exchange chromatography. Hydrophobic interaction membrane chromatography （HIMC） combines the advantages of HIC and membrane process and has showed great potential in bioseparation. For better understanding of HIMC, this review presents an overview of two main concerns about HIMC, i.e. membrane materials and hydrophobic ligands. Specifically, cellulose fiber-based membrane substrate and environment-responsive ligands are emphasized.

关键词： hydrophobic interaction membrane chromatography bioseparation membrane environmental response ligand

来源：

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

Numerical Approximation of Stochastic Theta Method for Random Periodic Solution of Stochastic Differential Equations

引用

Acta Mathematicae Applicatae Sinica 2020年第3期36卷 689-701页

作者： rong WEI Chuan-zhong chen School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China School of Science Hainan UniversityHaikou 570228China

In this paper,we make use of stochastic theta method to study the existence of the numerical approximation of random periodic *** prove that the error between the exact random periodic solution and the approximated on... 详细信息

关键词： Stochastic theta method random periodic solution numerical approximation

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：