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Search Results: 1 - 10 of 19821 matches for " 尉佳琪 "
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城市快速路指路系统优化设计——以宁波北外环快速路为例
The Optimization of Urban Expressway’s Guiding System: A Case Study of North External Ring in Ningbo
 [PDF]

, 张水潮, 蒋英杰,
Open Journal of Transportation Technologies (OJTT) , 2015, DOI: 10.12677/OJTT.2015.46013
Abstract:
针对驾驶员在快速路下错出口匝道,未能第一时间到达理想的地面道路等情况,对城市快速路指路系统进行一系列的优化设计,最大限度地发挥指路系统的作用。同时,以宁波北外环快速路为例,将设计理念运用于实践。经过优化设计后的指路系统为车辆驾驶员提供全面准确的道路信息,引导车辆高效出行,进而有效缓解地面道路的交通压力。
According to the situation that drivers pick wrong off-ramps on the expressways and fail to reach the perfect ground roads in the first time, the paper takes a series of optimization on the guiding system of urban expressways in order to make it work at maximum limit. At the same time, illustrated by the example of Ningbo north external ring, this paper takes design concepts into practice. The optimized guiding system offers overall and accurate road information, guides vehicles to trip efficiently, and effectively mitigates traffic pressure of ground roads.
2013-24科技工作大家谈:中小生物制药企业服务化发展新趋势
张敏,王仰东,
科技导报 , 2013,
Abstract: 生物制药作为全球最具成长性的朝阳产业之一,是关系国计民生的战略性新兴产业和未来国民经济发展的重要支柱产业。中小生物制药企业作为产业内最具创新活力的群体,对产业链创新能力的整体提升将产生深远而重要的影响。生物制药企业的发展,不仅是简单的研究和开发过程,还需要选择符合自身特点、发挥技术优势的新型商业模式,保障企业的生存和长远发展。基于对2005—2012年国家创新基金支持的中小生物制药企业数据的归类整理和分析统计,可以发现我国中小生物制药企业表现出的服务化发展新趋势。
5083铝合金静态再结晶行为研究
Study of Static Recrystallization Behavior of 5083 Aluminum Alloy
 [PDF]

, 戴青松, 付平, 邓运来
Material Sciences (MS) , 2016, DOI: 10.12677/MS.2016.63016
Abstract:
本文采用Gleeble热模拟实验、金相实验、硬度实验验,研究了热变形条件及热处理条件对5083铝合金静态再结晶行为的影响。研究结果表明:5083铝合金热变形过程中Zener-Hollomon参数值越大或变形程度越大,则合金在后续退火过程中的再结晶速率越大,再结晶后的晶粒尺寸越细小;热变形后的退火温度越高,则合金在退火过程中的再结晶速率越大,但退火温度对合金再结晶后的晶粒尺寸影响不明显;随着退火时间的延长,合金金相组织从纤维状转变为等轴状,进一步延长退火时间后晶粒将发生长大现象。根据实验结果建立了5083铝合金静态再结晶动力学方程。
This paper examined the effects of hot deformation conditions and heat treatment conditions on the static recrystallization behavior of 5083 aluminum alloy, using Gleeble thermal simulation experiment, metallography experiment and hardness test. The results indicate that with the rising of Zener-Hollomon parameter value or deformation amount during 5083 hot deformation process, the recrystallization rate increases and the recrystallized grain size of the alloy becomes finer. Moreover, the increase of annealing temperature after hot deformation can promote the recrys-tallization rate while annealing temperature has no obvious effect on the recrystallized grain size of the alloy. Microstructure of the alloy develops from a fibrous structure into an equiaxed one with the increase of holding time, and grain growth appears with the increase of time. The kinetics equation of static recrystallization of 5083 aluminum alloy was established based on the experi-mental results.
我国高技术服务业发展对策研究――基于2005―2009年创新基金的数据
王仰东,安琴,窦君鸿,
科技进步与对策 , 2010,
Abstract: 阐述了高技术服务业的内涵和特征,指出了发展高技术服务业的意义。通过对2005―2009年创新基金支持高技术服务业的数据分析,提出促进高技术服务业发展的对策,以推动我国产业结构的调整和经济增长方式的转型。高技术服务业创新基金产业结构调整经济转型
分家析产对耕地田坎系数的影响——以河西走廊地区永昌县为例
,陈英
资源科学 , 2012,
Abstract: 农村土地实行均包制,从而导致土地被分割,农户承包地细碎化的趋势十分明显,耕地田埂系数逐年增加。本文针对河西走廊地区永昌县6个镇4个乡的109个行政村的农户,选取10个样区的调查数据为基础,运用AHP层次分析法分析得出影响耕地田坎系数各因素的权重,在此基础上,走访调查农户对分家析产的意愿及结合土地分等定级进行土地承包分配的意愿。结果表明,分家析产后大多数农户耕地中耕地田坎系数明显增加,实际耕作面积减少。最后结论认为,分家析产会影响耕地田坎系数,进而影响到实际耕作面积,最终制约土地利用集约化的发展。因分家行为在短期内不会改变,所以借助农用地分等定级方式分配土地,有效降低耕地田坎系数,减少零碎化,减低农业成本。同时研究数据显示农户选择该方法的意愿较高,希望政府从农户具体行为入手,促进农业规模化经营,促进土地流转改革,提高土地集约化程度。
羧甲基化沙柳木粉对水溶液中Pb2+的吸附性能
Adsorption Properties of Pb2+ in Aqueous Solution by Carboxymethyl Salix psammophila Powder

,王丽
- , 2018, DOI: 10.3969/j.issn.1001-7461.2018.04.32
Abstract: 以沙柳木粉(SPP)为原料,以无水乙醇、氢氧化钠、氯乙酸为反应试剂,通过对SPP醚化改性得到羧甲基化沙柳木粉(CMS)。采用透射电镜(TEM)、X线衍射(XRD)、X线光电子能谱分析(XPS)等表征手段对SPP和CMS的微观结构进行分析。考察吸附剂用量、Pb2+溶液初始浓度、吸附时间、吸附温度、Pb2+溶液pH值等因素对SPP和CMS吸附Pb2+性能的影响,研究SPP和CMS吸附Pb2+的吸附动力学和吸附等温线。结果表明,SPP经羧甲基化改性形成的CMS,表面变得疏松多孔,晶体结构发生了变化,羧甲基成功引入到了CMS中。当SPP和CMS的投加量分别为0.7 g和0.5 g,Pb2+溶液初始浓度均为900 mg?L-1,吸附时间为120 min,吸附温度为30℃,Pb2+溶液pH值分别为5和4时,SPP和CMS对Pb2+的吸附量最大,分别为30.64 mg?g-1和71.55 mg?g-1。SPP和CMS对Pb2+的吸附过程均更符合伪二级动力学模型和Freundlich等温线模型。
The carboxymethyl Salix psammophila powder (CMS) was prepared by using S.psammophila powder (SPP) as raw material,anhydrous ethanol,sodium hydroxide and chloroacetic acid as the reaction reagents.The micro structures of SPP and CMS were characterized by means of TEM,XRD and XPS.The adsorption properties of Pb2+ on SPP and CMS under different adsorption conditions such as the adsorbent dosage,initial concentration of Pb2+,adsorption time,adsorption temperature and the pH of Pb2+ solution were investigated,and the adsorption kinetic and isotherm of Pb2+ adsorption on SPP and CMS were studied.The characterization results showed that the surface of CMS became loose and showed a porous network structure,crystal structure changed,the -CH2COO- was grafted and introduced into the CMS.The experiments results showed that the adsorption capacities of SPP and CMS reached a maximums of 30.64 mg?g-1 and 71.55 mg?g-1 as the dosages were 0.7 g and 0.5 g respectively,the initial concentration of Pb2+ was 900 mg?L-1,the adsorption time was 120 min,the adsorption temperature was 30℃ and the pH values of Pb2+ solution were 5 and 4,respectively.Adsorption processes of SPP and CMS were in good agreement with the Pseudo-second-order kinetic and Freundlich isotherm model
退火工艺对5083铝合金板材组织性能的影响
The Effect of Annealing Technics on the Microstructures and Properties of 5083 Aluminum Alloy Sheet
 [PDF]

卢恒洋, 邓运来, 戴青松,, 付平
Material Sciences (MS) , 2014, DOI: 10.12677/MS.2014.44021
Abstract:
采用金相观察、室温拉伸、冲杯实验、织构分析等方法分析了不同退火制度对5083铝合金板材组织性能的影响。分析结果表明:5083铝合金板材经270℃/1 h退火后开始发生再结晶,360℃/1 h退火后实现完全再结晶;板材随着退火温度的升高抗拉强度与屈服强度呈下降趋势,延伸率呈上升趋势;未经退火处理的冷轧板深冲时底部容易出现裂纹,退火后深冲性能得到改善,经360℃/1 h退火的板材深冲性能最好,制耳率为2.44%;经织构检测分析发现冷轧板具有强的形变织构,经360℃/1 h退火后形变织构减弱,再结晶织构增强。
The effect of annealing technics on the microstructures and properties of 5083 aluminum alloy sheet were analysed by metallography, tensile testing, deep drawing and texture analysis. Results indicated that: the sheet started to recrystallize after 270℃/1 h annealing and recrystallization fi-nished after 360℃/1 h annealing. The strength of 5083 Al declined while elongation rised after annealing. The sheet without annealing treatment was prone to generate cracks at the bottom of the cup under deep drawing cups testing, and the deep drawing performance was improved after annealing. The earing rate was only 2.44% when the annealing technics was 360℃/1 h. The texture detection analysis found that the deformation textures of cold-roll sheet were strong, while deformation textures declined and recrystallization textures enhanced after 360℃/1 h annealing.
德语表现主义文学中国形象的权力关系论
赵小,张慧
安徽大学学报(哲学社会科学版) , 2013,
Abstract: 德语表现主义文学是一支关注中国,并欲从中汲取文化精髓以重建西方文化的文学力量。他们在创作实践中建构的中国形象涉及身体、知识、空间等方面,它们均与权力息息相关,并统一于中国权力场域之中。中国知识是权力实践的工具,中国空间是权力运作的容器,中国身体是权力规训的对象,均为权力意志的实践和权力机制的稳定而服务。同时,中国身体、知识、空间也是一种动态、主动的能量,它们可以作用于权力机制,对既有机制中不合理的部分进行革新,并整合出一个新的、利于社会文明进程的权力机制。
脉冲变压器锥形绕组感应系数矩阵简化计算方法
李名加,康强,
强激光与粒子束 , 2008,
Abstract: ?在进行脉冲变压器多匝数(实际变压器绕组匝数多达4000以上)锥形绕组电压分布仿真时,绕组感应系数矩阵巨大的计算量是制约其实现的瓶颈之一。为了克服此瓶颈,研究了绕组感应系数矩阵的规律性,指出感应系数存在端部效应,且线圈间的互有感应系数随间距衰减很快。在此基础上提出了脉冲变压器锥形绕组感应系数矩阵的简化计算方法,对多匝数绕组,该方法能传统方法所需的n(n+1)/2步减少至2n+25(n为绕组匝数),大大减少了计算量,使多匝数绕组的仿真计算成为可能。
中国进出口许可证综合领先指数及其监测预警研究
唐宜红,,
中央财经大学学报 , 2015,
Abstract: 摘要 笔者利用概率统计以及计量经济学方法对我国许可证申领数据库进行发掘和建模。由于许可证申领数据序列领先于我国商品实际进出口量值序列,因此本文采用概率密度函数、ARMA、回归、VAR、聚类分析等统计及计量方法,从定量角度分析许可证申领数据对实际进出口数据的领先性特征。在此基础上,笔者构建了中国进出口许可证综合领先指数,并利用该指数对中国重点商品进出口状况进行监测预警。我们尝试系统地对我国许可证申领数据库进行数据挖掘、统计计量建模、领先指数构建并进行监测预警,这在国内外均属首次,具有开创性意义。通过本课题的研究发现:许可证数据库具有构建许可证综合领先指数并进行监测预警的数据基础。许可证申领数据对我国对外贸易具有领先性,但不同商品的领先规律不同。建立在单个商品上的领先指数的预警监测功能要优于分类指数及综合指数。
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