共查询到20条相似文献，搜索用时 78 毫秒
1.
通道经济是随着通道的变迁而发展演化的,其基本的发展轨迹是从简单的通道到封闭经济空间内生产要素交流的通道、开放空间中内外连接及生产要素自由流通的通道再到由生产要素的自由流动而产生的对其进行规范及更好服务的制度通道.它经历了陆上通道经济、海上通道经济、交通通道经济、产业(转移)通道经济和制度通道经济五个阶段. 相似文献
2.
随着新世纪的到来,经济全球化的趋势越来越明显。为促进对外贸易的发展,中国在对外开放中,除了既有的中俄(有满洲里—后贝加尔、绥芬河—格罗迭科沃、珲春—马哈林诺铁路通道)、中蒙(二连—扎门乌德通道)、中哈(阿拉山口—德鲁日巴通道)、中越(河口—老街、凭祥—谅山通道)、中朝(图们—南阳、丹东—新义州、集安—南浦铁路通道)等国际铁路通道外,近远期又规划了多条与邻国铁路接轨的国际通道。一、黑龙江省通往俄罗斯的出境铁 相似文献
3.
介绍了光纤通道的分类,并对专用通道及复用通道二类通道构成特点进行了分析.在实际运行中,因施工质量、设备接口、维护等方面的原因,导致光纤保护通信中断情况时有发生,因此重点对光纤保护通道中断各种原因进行了分析,同时提出了光纤通道中断处理的思路和方法. 相似文献
4.
5.
王先春 《阅读与作文(高中版)》2017,(12)
卖出法则九,通道上轨时卖出.通道分为上升通道和下降通道.上升通道由两条向右上方伸展的平行直线组成,股价在平行线间振荡上行.与上升通道相比,下降通道只是趋势相反,且通道中一浪比一浪低. 相似文献
6.
《语文世界(高中版)》2016,(Z2)
正李华平教授指出:语文教师要致力于为学生的语文学习打通课程通道,铺设社会通道,两条腿走路!笔者在教学实践中,尝试借助于这两个概念来研究教学,取得了一些认识,借助本文,期与同行分享。一、初中语文教学中课程通道与社会通道的现状如果说课程通道因为语文教师浸淫已久而不需要太费笔墨的话,那社会通道及其之于语文教学的意义,则需要费些口舌。语文课程实施的情境中,讨论社会通道之于语文及其教学的意义,需要厘清语文与社会的关 相似文献
7.
李中波 《中阿科技论坛(中英文)》2024,(4):34-38
目前,宁波至武汉货运通道分为南北两个通道,北通道合武铁路货运功能不足,经宣杭—芜铜铁路运输效率低,而南通道衢九铁路货运功能弱,沪昆铁路金华至衢州段能力无法满足运输需求。基于此,文章针对既有通道存在的问题,提出构建新通道——宁波至武汉货运中通道。根据通道内主要货物运输径路比较分析,合理确定通道分工,进而对区域内通道货运量进行OD分配预测及新通道货运量预测,并论证了建设武汉至宁波货运中通道的必要性。 相似文献
8.
《东南大学学报》2017,(2)
采用分子动力学模拟方法建立了石墨烯纳通道中离子输运的模型,统计了不同直径石墨烯纳米孔两侧的电势和电荷分布,确立了电势和电荷分布随纳米孔直径的变化关系.通过施加匀强电场使极性水分子在石墨烯纳通道中重新排列,总结出水分子的极化程度与纳通道直径的对应关系.利用建立的纳通道中离子输运的理论模型,定量分析了不同直径纳通道中的阴、阳离子浓度与体态溶液浓度的变化关系.结果表明,纳米孔径的减小会导致孔两侧电势降的增大、聚集电荷的增多,并且水的极化程度也更加明显.此外,在较低浓度的NaCl溶液下,纳通道中氢离子浓度占的比重大.随着NaCl溶液浓度的增加,通道中钠离子的浓度上升值远大于氢离子的浓度减小值,因此,钠离子浓度对于离子电导的贡献更大. 相似文献
9.
10.
近几年来，中国石油进口量一直处于增长的势头，但进口通道在很大程度上却仍然依赖某个单一渠道，安全风险系数极大。我国石油进口还可开辟中俄石油管线、泰国克拉地峡运河、中缅石油通道、中巴能源走廊等战略通道，通过采取加强能源外交、加强东亚区域合作等措施，提高我国石油进口通道的安全系数。 相似文献
11.
Illumination system with compound parabolic retro-reflector for single LCOS panel projection display
ZHEN Yan-kun YE Zi ZHANG Wen-zi ZHAO Ting-yu YU Fei-hong 《浙江大学学报(A卷英文版)》2007,8(12):2021-2026
In this paper, a new illumination system with ultra high performance (UHP) lamp is proposed for projection display. Parabolic reflector (PR) and compound parabolic retro-reflector (CPR) were jointly used to collect and collimate the light generated from UHP lamp. A polarization converter system (PCS) was used to increase the light efficiency of the projection display system. A beam transformer between PCS and 2f imaging systems was directly used to make the illumination meet the requirement of projection display system. With the consideration of the loss of reflection, the light efficiency in this projection display system was estimated to be 15.6%. 相似文献
12.
建立轴射圆柱面投影方法，研究轴射圆柱面投影下球面向圆柱面投影的理论，解决正投影无法解决的复杂的旋转体投影问题．用轴射圆柱面投影法的投影理论，建立球面和圆柱面的一一对应关系，找出二者之间的某些几何规律，该投影下任意形状的球面投影到圆柱面上是相等的，建立球面的轴射圆柱面投影定理，解决球面不规则计算问题． 相似文献
13.
张孝荣 《安徽师范大学学报(人文社会科学版)》2010,38(4):464-468
简明短语结构下线性化的要求取消了名词短语结构中的中间投射,并加入了轻名词n这一功能语类.通过对英语动名词与名词短语在句子中的分布可以看出,线性化理论驱使了动名词中简单名词至动词之前的移位以及做主宾语的名词短语至限定词短语的进一步投射.这样限定词短语假设得到修正,是否产生限定词短语投射这一操作不是必须的,它取决于名词短语在句中是否为承担题元角色的论元. 相似文献
14.
罗玉明 《中国教育技术装备》2006,(7):43-46
日光灯源所产生的眩光、频闪、反光、光帘、投影等光污染现象,严重损害眼睛;课室单边自然采光所产生的强光、眩光现象,使眼睛严重散光。“视力保护灯网”和“窗前导光安全网”从光线导向的原理出发,使眼睛不直接接触到光源,同时使光线进行折射及漫射,从而有效地减免了光污染现象,起到保护视力的作用。 相似文献
15.
冯景华 《遵义师范学院学报》2002,4(3):93-95
以光锥和二惯性系映射的几何方法结合洛伦兹变换 ,讨论了参考系变换下不同的时空区域中事件的时间顺序 ,直观的描述了狭义相对论的因果律 相似文献
16.
A prospective,randomized crossover study comparing direct inspection by light microscopy versus projected images for teaching of hematopathology to medical students 
下载免费PDF全文
下载免费PDF全文 Aaron M. Carlson Ellen D. McPhail Vilmarie Rodriguez Georgene Schroeder Alexandra P. Wolanskyj 《Anatomical sciences education》2014,7(2):130-134
Instruction in hematopathology at Mayo Medical School has evolved from instructor‐guided direct inspection under the light microscope (laboratory method), to photomicrographs of glass slides with classroom projection (projection method). These methods have not been compared directly to date. Forty‐one second‐year medical students participated in this pilot study, a prospective, randomized, crossover study measuring educational performance during a hematology pathophysiology course. The students were randomized to one of two groups. All students received the same didactic lectures in the classroom and subsequent case‐based review of peripheral blood smears using either laboratory or projection methods, on day one with a crossover to the other method on day two. Pre‐ and post‐test examinations centered on morphology recognition measured educational performance on each day, followed by a questionnaire identifying the student's favored method. There was no significant difference in the pre‐test and post‐test scores between the two teaching methods (rank‐sum P = 0.43). Students overwhelmingly preferred the projection method and perceived it as superior (76%), although post‐test scores were not significantly different. Student's recommended method was split with 50% favoring the projection method, 43% favoring a combined approach, and 23% noting logistical challenges to the laboratory. In this study, the laboratory and projection method were equivalent in terms of educational performance for hematopathology among medicals students. A classroom‐based approach such as the projection method is favored, given the large class sizes in undergraduate medical education, as well as the ergonomic challenges and additional resources required for large group instruction in a laboratory setting. Anat Sci Educ 7: 130–134. © 2013 American Association of Anatomists. 相似文献
17.
Bryan Thomas Walsh 《Quarterly Journal of Speech》2013,99(4):468-473
A climate of political repression, formed by the Pitt Government in response to agitation by so‐called “radical” societies, surrounded debate on the Habeas Corpus Suspension Bill of 1794. Pitt employed rhetorical tactics such as manipulating evidence and disparaging motives in order to secure passage of this repressive measure. Pitt's tactics appear unjustified in the light of available historical evidence. 相似文献
18.
INTRODUCTION Measurement technology for gas-solid two phase flow has important applications in fields such as process measurement, forecast and control in in- dustry (Teng et al., 2002). At present, most optical measurement methods, such as LDV (Laser Doppler Velocimetry), Laser Dust Particles Measurement Device, use an optical sensor probe that only yields information on a single point or a partial area in the flow field and cannot yield instantaneous multi-ori- entation flow states.… 相似文献
19.
沈翔 《商丘职业技术学院学报》2012,(5):82-85
基于红外线投射和感应的多点触摸交互系统,通过设计红外线感应以及对反射光的图像处理,将图像映射成多点触摸手势.系统通过标准协议将手势传输到应用程序,完成交互.系统利用开源开发框架,扩展系统应用范围,满足各个领域的需要. 相似文献