共查询到20条相似文献，搜索用时 493 毫秒
1.
通过研究MTL代数M中滤子、极大滤子的性质,在M的全体素滤子集P(M)上引进拓扑T并研究拓扑空间(P(M),T)的紧致性、分离性、连通性等拓扑性质,证明了(P(M),T)是紧致的T0空间.如果把P(M)上拓扑T限制在M的全体极大滤子集M(M)上,则(M(M),TIM(M)是紧致的Hausdorff空间. 相似文献
2.
数学建模在经济管理中起着重要作用,它有利于解决资源有效配置以期达到节省资源使利润最大化。本文讨论了数学建模的方法和步骤,并将数学建模应用于排队中,最后分析了三个窗口下M/M/3模型优于三个M/M/1模型,为解决日常排队提供了参考方案。 相似文献
3.
幂等MV-代数 总被引：1，自引：0，他引：1
曾庆怡 《广东教育学院学报》2008,28(3):32-35
设M是一个MV-代数,如果M是Artinian幂等的,则M是有限个极小理想的直和．对于有限MV-代数M,M是幂等的当且仅当存在正整数n,使得/M/=2^n;当且仅当M同构于MV-代数2^X,其中X是由n个元素组成的集合． 相似文献
4.
房琦贵 《宁夏师范学院学报》2010,31(3):1-4
设M为完备、连通、定向的二维Hessian流形,若M的仿射平均曲率为非负常数,则M等距于E^2／Г,Г为自由,纯不连续作用在E^2上的等距离散子群． 相似文献
5.
基于排队论医院仿真优化研究 总被引：1，自引：0，他引：1
收集患者排队挂号时间和就诊等候时间,本文利用M／M／I／∞／∞和M／M／c／∞／∞两种排队模型进行分析,通过计算比较,M／M／c／∞／∞排队模型较合理,可以提高医院的服务效率和减少患者的就诊等候时间和就诊时间。对挂号室分层布置,完善了患者就诊流程,在患者的候诊区域设置辅助服务设施提高患者满意度。通过Flexsim系统仿真软件对新旧科室布局进行仿真比较,为医院改善布局提供依据。 相似文献
6.
7.
王金洲 《荆州师范学院学报》2008,(2):63-67
中国企业进行跨国并购呈现出并购金额不断扩大、并购行业更加广泛、单项并购标的额趋于上升等特点。中外企业在跨国并购的主要动因、并购战略、并购主客体、并购的主导行业、并购的支付方式等方面存在着巨大差异。中国企业在今后的跨国并购中必须转变并购战略,重塑并购主体,多采用现金支付手段,充分发挥国际中介机构作用,政府应制定和完善跨国并购的相关政策和措施。 相似文献
8.
周晓泉 《蒙自师范高等专科学校学报》2001,3(2):24-26
当互感系数M是变量时 ,互感系数的两种定义式M =ψ2 1I1和M =-ε2 1/ dI1dt 是两种物理量M静 和M动 的定义式 ,它们不等同。从几何意义上来看 ,前者表示 ψ2 1-I1曲线上点A到原点O的直线的斜率 ,后者表示该曲线在A点处的切线的斜率 ,而且二者关系是M动 =M静 +I1dM静dI1。但是许多教材认为只有M=常数时 ,M =-ε2 1/ dI1dt 才成立 ,这是不完全正确的 ,本文就针对这一问题作详细的论述 相似文献
9.
Yan-long Zhao Pu-xun Tian Feng Han Jin Zheng Xin-xin Xia Wu-jun Xue Xiao-ming Ding Chen-guang Ding 《Journal of Zhejiang University. Science. B》2017,18(12):1055-1063
Macrophages have a diverse set of functions based upon their activation states. The activation states, including resting (M0) and polarizing (M1 and M2) states, of macrophages derived from the mouse bone marrow, spleen, and peritoneal cavity (BMs, SPMs, and PCMs, respectively) were compared. We evaluated the macrophage yield per mouse and compared the surface markers major histocompatibility complex (MHC) II and CD86 by flow cytometry. The relative mRNA levels of tumor necrosis factor-α (TNF-α), interleukin (IL)-1β, mannose receptor (MR), and Ym1 in the M0, M1, and M2 states were also compared using real-time polymerase chain reaction (PCR) analysis. Bone marrow yielded the most macrophages with the best homogeneity, but they were polarized toward the M2 phenotype. All three types of macrophages had the capacity to polarize into the M1 and M2 states, but SPMs had a stronger capacity to polarize into M1. The three types of macrophages showed no differences in their capacity to polarize into the M2 state. Therefore, the three types of macrophages have distinct characteristics regardless of their resting or polarizing states. Although bone marrow can get large amounts of homogeneous macrophages, the macrophages cannot replace tissue-derived macrophages. 相似文献
10.
11.
根据电子排布法按保里原理的要求，将给定的组态的电子分别排布在各可能的轨道上，然后在可能的电子排布的微观状态中找出M5的最大值（M5)max,以及与之相适应的（ML）max,根据这两个值找出S和L值，得出光谱项，再将ML和MS偶合，得到光谱支项。 相似文献
12.
We have collaborated for 25 years as indigenous Māori and non-Māori researchers undertaking research with Māori families, their schools and communities. We have endeavored to meet our responsibilities to the Māori people (indigenous inhabitants of New Zealand) and communities with whom we have researched, as well as meet the requirements and responsibilities of our academic institutions. In this paper, we reflect on the implications of these responsibilities for our work as supervisors of master’s and doctoral students (Māori and non-Māori) who seek to draw on decolonizing methodologies as they undertake research in Māori cultural contexts. We draw on the experiences and interactions we have had with four different postgraduate students whose research on improving educational outcomes for Māori students has required them to engage and participate in Māori cultural contexts. 相似文献
13.
商龙燕 《喀什师范学院学报》2008,29(5):32-35
通过构建一个同质产品的古诺市场竞争模型,在贸易自由化背景下,比较了外国企业技术授权和兼并方式对于本国社会福利的影响。分析表明,在不同贸易自由化水平下,外国企业偏好的技术授权方式会发生变化;虽然外国企业更偏好兼并本国企业,但是兼并可能会降低本国的社会福利。当贸易自由化程度较高时,外国企业才会采取双重收费的技术授权,此时引致本国社会福利处在较高水平。与兼并相比,固定收费或特许权收费方式的技术授权所引致的本国社会福利变动幅度,则需具体情况具体分析。与特许权收费的技术授权相比,兼并引致的社会福利几乎总是较高的。 相似文献
14.
采用密度泛函(DFT)计算方法,在UB3LYP/6-311 G(3d,2p)水平上优化了过渡金属正离子乙炔络合物M(C2H2) (M=Sc,Ti,V)不同自旋态的稳定几何构型,并对此络合物体系的全部振动频率进行了计算和全面分析。结果表明,能量较低的高自旋态M 与C2H2在形成络合物时,M 的价电子要发生翻转,形成稳定的低自旋态络合物。根据频率分析,所计算的振动频率值反映出低自旋态络合物比高自旋态络合物有较强的M-C键,在形成低自旋态络合物的同时,过渡金属正离子M 已活化了乙炔的C-C三键和C-H键。 相似文献
15.
Separate groups of water-deprived rats had four trials with 15-min access to 0.0073 M saccharin, 0.3 M alanine, 0.3 M glucose,
0.1 M maltose, 0.3 M fructose, 0.06 M sucrose, or 0.03 M Polycose. Trials 1–3 were followed by injections of either 0.15 M
LiCl (1.33 ml/100 g b.w., i.p.) or saline; Trial 4 (Test) was CS only. Extinction included either 48-h access to water alone
or to the appropriate CS, both followed by a 24-h, two-bottle choice of CS and water. This 3-day cycle was repeated five to
six times. All rats acquired comparable conditioned taste aversions (CTAs), but extinction rates varied with the test and
the taste CS. No CTA extinguished during the two-bottle choices following 2 water days. During one-bottle CS exposure, all
CTAs extinguished, but the aversion continued longer in the probe two-bottle tests. Intake of glucose moieties recovered rapidly,
often in two cycles; the other CSs took four to six cycles. Thus, CTA extinction varies with the nature of the taste CS. 相似文献
16.
Mansoor Niaz 《科学教学研究杂志》1988,25(8):643-657
It has been shown that student performance in chemistry problems decreases as the M demand of the problem increases, thus emphasizing the role of information processing in problem solving. It was hypothesized that manipulation (increase or decrease) of the M demand of a problem can affect student performance. Increasing the M demand of a problem would affect more the performance of subjects with a limited functional M capacity. The objective of this study is to investigate the effect of manipulation (increase) of the M demand of chemistry problems, having the same logical structure, on performance of students having different functional M capacity, cognitive style, and formal operational reasoning patterns. As predicted the performance of one group of students was lower after the manipulation (increase) in the M demand of the problem. This shows how even small changes in the amount of information required for processing can lead to working memory overload, as a consequence of a poor capacity for mobilization of M power. 相似文献
17.
Jenny Lee-Morgan Matthew Courtney Maureen Muller 《Asia-Pacific Journal of Teacher Education》2019,47(2):137-151
Little research has been concerned with gauging Māori–medium teacher education students’ academic confidence in bilingual settings making the development of appropriate curricula and broad policy a difficult task. Drawing on a convenience sample of 84 primary teacher education students on a three-year B.Ed Māori-medium program, this study uses self-reported measures to assess students’ academic confidence and preparedness in English and Māori. Results suggest that the students are less academically confident in Māori than in English, and that this discrepancy is most pronounced in academic speaking and reading. Consequently, it is proposed that curriculum developers place emphasis on the development of both Māori academic speaking and reading throughout the course of Māori-medium teacher education programs. Finally, it is argued that standardised assessments that track both confidence and preparedness, and the productive and receptive abilities of Māori-medium teacher education students throughout university would bolster the regeneration of Māori-medium education in New Zealand. 相似文献
18.
M1卡作为射频卡的一种,由于具有"一卡多用"的突出特点,而成为一卡通系统的首选卡型.本文共分三部分,分别介绍了射频卡的种类、M1卡的结构、M1卡在一卡通系统中的使用.在分析M1卡结构的基础上讨论了如何在M1卡上实现"一卡通". 相似文献
19.
《Educational Philosophy and Theory》2013,45(7):724-741
This second research paper on science education in Māori‐medium school contexts complements an earlier article published in this journal (Stewart, 2005). Science and science education are related domains in society and in state schooling in which there have always been particularly large discrepancies in participation and achievement by Māori. In 1995 a Kaupapa Māori analysis of this situation challenged New Zealand science education academics to deal with ‘the Māori crisis’ within science education. Recent NCEA results suggest Pūtaiao (Māori‐medium Science) education, for which a national curriculum statement was published in 1996, has so far increased, rather than decreased, the level of inequity for Māori students in science education. What specific issues impact on this lack of success, which contrasts with the overall success of Kura Kaupapa Māori, and how might policy frameworks and operational systems of Pūtaiao need to change, if better achievement in science education for Māori‐medium students is the goal? A pathway towards further research and development in this area is suggested. 相似文献
20.
本文利用国泰安（CSMAR）数据库数据,对2001-2010年上市公司并购事件进行统计检验与比较分析。通过分析,文章得出我国上市公司并购活动的一系列特征：并购时间分布特征、并购行业分布特征、并购前后主并公司经营业绩与资产负债率特征、并购企业性质等,这为以后进一步研究并购提供了参考。 相似文献