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Search Results: 1 - 10 of 295945 matches for " 李军? "
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PJS并发肠套叠一例
One Case of the PJ Syndrome Complicated with Intussusception
 [PDF]


Asian Case Reports in Oncology (ACRPO) , 2013, DOI: 10.12677/ACRPO.2013.21001
Abstract:
PJS是一种少见的家族遗传性疾病,临床表现胃肠道息肉和皮肤黏膜黑色素沉着斑点。早期切除肠息肉可延长PJS患者的生存时间,对PJS家族成员进行致病基因检测有助于及早确诊以及预测癌变风险。
PJS is a rare hereditary disease, and clinical features were pigmented spots on the lips and oral mucosa with gastrointestinal tract polyposis. Early resection of the bowel polyps in PJS patients will prolong survival time, detect causative gene of PJS family members contribute to early diagnosis and early prediction of cancer risk.
开向城市主干道的小区出入口门禁系统仿真与优化
Simulation and Optimization of Vehicle Access Control System for Gated Community Facing Urban Main Road
 [PDF]

邱乾,
Modeling and Simulation (MOS) , 2012, DOI: 10.12677/MOS.2012.11005
Abstract: 分析了直接开向城市主干道带门禁系统的小区出入口车辆运行特点,建立信号和门禁控制下的车辆排队模型,利用GPSS语言编程仿真分析,给出了多场景下交通流状态评价准则。以中山大学南校区南门出入口为案例,分析了门禁位置与效率对通行能力与延误的影响,给出了不同场景下的优化设置方案。
The characteristics of the vehicle flow on community entrances opening directly to city main roads are analyzed, vehicle queue system model under signal and access controlled is proposed, GPSS programming language is utilized to realize simulation under the different scenarios to evaluate the design of vehicle access control system. A case study of the south gate of South Campus of Sun Yat-sen University is presented; the impacts of position and efficiency of access control is evaluated, and the optimization strategies for different scenarios are proposed.
含裂纹功能梯度材料热接触的奇异积分方程方法
Singular Integral Equation Method for Thermal Contact Problem of FGM with Crack
 [PDF]

, 庞明
Advances in Applied Mathematics (AAM) , 2012, DOI: 10.12677/aam.2012.12007
Abstract:

接触问题是我们生产、生活和实际工程中常见的物理现象,由于在接触过程中接触区内不可避免会产生应力集中现象,从而大大降低了机械结构部件的使用寿命。近些年来功能梯度材料的出现大大改善了这种缺陷,所以研究功能梯度材料的接触问题对于提高生产效率,增加经济效益和工程安全有着重要意义。本文讨论了带裂纹的半无限大功能梯度材料的热接触问题。利用叠加原理将所研究的问题转化为第一类带Cauchy核的奇异积分方程,并利用数值求积方法求解了奇异积分方程,得到了裂纹尖端的应力强度因子。通过程序画图分析了材料参数,摩擦系数及裂纹尺寸对裂纹尖端应力强度因子的影响

 Contact problems are common physical phenomena in the real life and engineering practices due to the inevitability of contact. At the end of the contact area, the phenomenon of stress concentration may happen, which can significantly reduce the service life of mechanical structural components. In recent years, functionally graded materials (FGMs) have been used in many important engineering practices to relieve stress concentration. The study of the contact problem of functionally graded materials can provide instruction to improve production efficiency and increase economic benefits with a great deal. The present paper discusses the thermal contact problem of a half-plane functionally graded material with a crack. By using the superposition principle, the stated problem is reduced to the Cauchy type singular integral equations of the first kind, which are solved via numerical quadrature method. Then, figures are plotted to reveal the influences of the parameters of the non-homogeneity, the friction coefficient, and the dimension of crack on the stress intensity factor.

 

Π-可补充子群对有限群结构的影响
The Influence of Π-Supplemented Subgroups on Finite Groups
 [PDF]

, 刘阿明
Pure Mathematics (PM) , 2014, DOI: 10.12677/PM.2014.45025
Abstract:
H是群G的子群,如果对群G的任意主因子L/K,|G/K:NG/K(HK/KIL/K)|是 π(HK/KIL/K)-数,则称H在G中满足π-性质;如果存在G的子群T使得G=HT,并且HIT≤I≤H,其中I在G中满足π-性质,则称H在G中是π-可补充的。利用子群的π-可补充性,得到了有限群p-幂零性的一个新的判定方法。
Let H be a subgroup G . If every chief factor L/K of G, |G/K:NG/K(HK/KIL/K)| is a π(HK/KIL/K)-number, then H is called satisfying π-property in G. If there exists a subgroup  T of  G such that  G=HT and HIT≤I≤H , where I satisfies π-property in G , then H is called  π-supplemented in G . By the property of  π-supplemented, some new criterion of p-nilpotency of finite groups is obtained.
室内清扫机器人路径规划方法研究
Study on Path Planning of Cleaning Robot under Indoor Environment
 [PDF]

清然,
Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.66041
Abstract: 室内清扫机器人的应用越来越广泛,其路径规划直接影响到清扫效率和质量,一直是研究的热点。对传感器精度种类和精度的过高要求,可能降低路径规划的适应性,或者导致成本不可接受。在分析室内清扫机器人路径规划需求的基础上,提出了一种基于碰撞检测的纵横弓式路径规划方法,算法简单有效,区域覆盖率高,环境适应性强。
The cleaning robot under indoor environment has found an increasingly wide utilization. Its path planning directly affects the efficiency and quality of cleaning, which has always been a hot research topic. Too high requirements of sensor types and precision, may reduce the path planning adaptability, or lead to unacceptable cost. Based on the analysis of the path planning requirements of indoor cleaning robot, a path planning method based on collision detection is proposed, with a simple & effective algorithm, high area coverage, and strong environmental adaptability.
六通道试验迭代目标信号筛选方法研究
Research on the Method of Selecting Iterative Target Signal for Six Channels Test
 [PDF]

杨晓俊,
Mechanical Engineering and Technology (MET) , 2016, DOI: 10.12677/MET.2016.52022
Abstract:
本文针对六通道道路模拟试验台迭代加速度目标信号筛选行了研究,提出了一种将载荷谱离散进行单位化拟合的相关度分析方法,计算了前车身加速度信号和前副车架应变信号之间的相关度,提出了一种基于相关分析的台架迭代目标信号筛选方法。以伪损伤最大原则筛选了一组台架试验迭代目标信号,对相关分析法筛选结果与伪损伤最大原则筛选结果进行了时域、频域、相关性三个方面对比。
In this paper, the selection of the acceleration signals of the six channels road simulation test bench is researched. The correlation between the strain spectrum of sub frame and the acceleration spectrum of the car body is calculated by linear fitting. Acceleration signals are selected by the result of the correlation analysis. In addition, six acceleration signals were selected by comparing the pseudo damage of each acceleration spectrum. This group of acceleration signals was analyzed and compared with signals selected by correlation analysis within time-domain, frequency-domain and correlation-domain.
汉字字频与语义启动的ERP研究
An ERP Study on the Frequency and Semantic Priming of Chinese Characters
 [PDF]

, 王权红
Advances in Psychology (AP) , 2016, DOI: 10.12677/AP.2016.612161
Abstract:
本研究采用汉字作为材料,在语义启动比例一比三的条件下,两因素——汉字频率(高频、低频)和语义启动(启动、无启动)的被试内设计,使用同一字延迟判断任务,探究汉字字频与语义启动的作用。结果发现字频与语义启动出现了加法效应,支持多阶段激活模型。
This study uses Chinese characters as materials, in terms of semantic priming a scale of three, two factors concluding frequency (high frequency, low frequency) and semantic priming (start, no start) within subject design, and explores the effect of frequency and semantic priming of Chinese characters. The results show that word frequency and semantic priming are additive effect, and support the multistage activation model.
黄土高原地区土壤侵蚀研究方法综述
Review of Soil Erosion Research Methods in the Chinese Loess Plateau
 [PDF]

, 魏霞, 耀
Open Journal of Soil and Water Conservation (OJSWC) , 2013, DOI: 10.12677/ojswc.2013.11006
Abstract: 土壤侵蚀是复杂的综合性环境问题,在我国黄土高原地区尤为突出,针对此类问题将黄土高原地区对土壤侵蚀的研究分为实验法和模型法两大类,并对包括遥感监测、降雨模拟、示踪技术和水文模型在内的研究方法进行了综述与归纳,分析探讨了各种研究方法的特点、局限性、使用情况及发展方向,为研究黄土高原地区土壤侵蚀规律及其机理研究提供了相关参考。
 Soil erosion is a complex and comprehensive environmental problem, especially in the area of the Loess Plateau, China. The research methods of the soil erosion are divided into experimental and model methods in the Loess Plateau area. The existing research methods of soil erosion, including remote sensing monitoring, rainfall simulation experiments, tracer technique and hydrological models, are reviewed and summarized. The characteristics, limitations, application and development direction of various research methods are analyzed and discussed to provide relevant references for the further study on soil erosion in the Loess Plateau.
Problems for Attention in Medical Journal Advertisements and Measures
医学期刊应注意广告中存在的问题及对策


中国科技期刊研究 , 2005,
Abstract: 为了了解医学期刊刊登广告的情况,提高医学期刊广告质量,随机调查了2004年84种国内中文综合类、临床医学类医学期刊。结合调查与工作中对医学期刊广告的观察结果,认为当前医学期刊中存在着一些广告违法、违规;广告文字内容错误;广告装帧有待提高等问题;据此提出防范相关问题的一些看法。
从''天''到''无'':玄学文化的功能解析

浙江大学学报(人文社会科学版) , 1999,
Abstract: 汉末社会组织结构的离析与无序,是汉代“天人”文化模式功能消解的信号,玄学的产生正是汉魏士人面对现实危机旨在重构社会组织秩序而进行的文化革新的结果。其文化功能主要表现在以非人格化的“无”本体置换汉儒人格化的“天”,重新奠定了社会组织结构的形上基石,并通过对传统社会名教的重新诠释和定位,满足了建构社会新秩序的现实需要
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