二元函数L’HOSPITAL法则初探

本文依据一元函数Ｌ’Ｈｏｓｐｉｔａｌ法则推导过程，给出了相应的二元函数Ｌ’Ｈｏｓｐｉｔａｌ法则。     

用母函数求解有限马尔可夫链问题

本文主要讨论了如何用母函数求解有限马尔可夫链问题的方法,并用此方法求解了一种随机徘徊问题.     

一维波动方程混合问题的差分解

对在第三类边界条件下一维波动方程的混合问题进行了差分求解,并得到了差分格式,通过编程计算得出了方程的解.     

用L′HOSPITAL法则判定二元函数极限的不存在

本文介绍了一种利用Ｌ＇ＨＯＳＰＩＴＡＬ法则判定二元函数极限不存在的方法，并对其适用范围进行了讨论。     

试论用初等方法解函数方程

本文论述了用换元法、递归法、柯西法的方法解函数方程.     

Legendre小波求非线性Volterra-Fredholm积分方程的数值解

考虑用Legendre小波逼近求非线性Volterra-Fredholm积分方程的数值解。首先描述了Legendre小波的性质,然后用Gaussian积分方法转化为求解代数方程。     

神话与现实──对加拿大多元文化主义政策的再思考

神话与现实──对加拿大多元文化主义政策的再思考王丽芝１９７１年１０月８日加拿大联邦总理特鲁多宣布：联邦政府接受“皇家双语和二元文化委员会”（ＴｈｅＲｏｙａｌＣｏｍｍｉｓｉｏｎｏｎＢｉｌｉｎｇｕａｌｉｓｍａｎｄＢｉｃｕｌｔｕｒａｌｉｓｍ）的建议，将“双...     

使鹿鄂温克族二元现象浅析

使鹿鄂温克族二元现象浅析孔繁志使鹿鄂温克族是我国鄂温克族三支族群之一。在历史上被误称为“雅库特人”，亦即鄂温克“使鹿部”。１９９２年人口为１５９人（不包括散居外地人口约２０人），居住在内蒙古根河市敖鲁古雅鄂温克族乡，主要从事狩猎业和驯鹿业。直到本世纪...     

三维谐振子的能级与简并

三维谐振子的能级与简并刘靖华（成教部）三维谐振子的哈密顿量为Ｊ如果哈密顿量可以分离变量，就必然有：Ｅ一Ａ因此可以设定态薛定愕方程Ｈ４＝Ｅｇｈ的解）两边均除以～得如要上式两边相等，必须在含ｘ、ｙ、ｚ部分分别相等，亦即：分别为沿Ｚ、ｙ、Ｚ方向的线性谐振子...     

二维有限深矩形势阱中电子的束缚能量状态

本文利用定态薛定谔方程,求解二维有限深矩形方势中电子的本征能量.数值计算表明:当势阱深度给定时,能量随阱宽的增加和量子数的减小而下降.当阱宽给定时,能量随势阱深度和量子数的增加而增加.势阱深度和量子数不同的能级有可能发生交叉.     

甜菜施肥和种植密度综合效应初探

应用多元二次肥料效应数学模型，根据种肥、追肥、密度和甜菜产量结果，得出粉沙壤土肥料密度综合效应方程y＝1954．524＋10．334x1＋31．890x2＋130．027x3＋68．925x1x2＋7．775x1x3＋26．700x2x3＋124．435＋41．082－124．811。用此方程估测甜菜产量和实际产量极为接近。     

秋季不同播期紫羊茅生长动态及其模拟

采用分期播种的方法，研究了秋播紫羊茅的株高生长动态和分蘖动态，并建模拟模型。研究结果表明，温暖的气候有利于紫羊茅株高生长，而凉爽的气候可促进其分蘖。但炎热与低温气候均不利于紫羊茅幼苗生长。秋播紫羊茅在生育期１５ ～３５ 天时株高生长较快，３５ 天之后，株高生长速率减慢，分蘖速率加快。秋播紫羊茅的株高生长动态可用 ｙ ＝ ａ ＋ ｂ／ ｘ 模型模拟，分蘖动态可用逻辑斯谛模型模拟。     

海东汉族几例特殊亲属称谓制度探微

每一种亲属称谓制度都是建立在与其对应的某一婚姻家庭制度之上的。由于亲属称谓制度的变化要比婚姻家庭制度的更替缓慢的缘故,因而通过现行的大众化的亲属称谓制度就已很难恢复出人类历史上曾流行过的一些婚姻家庭制度。但是局部地域的“与众不同”的亲属称谓制度却能反照昔日存在过的某些婚制,青海海东地区汉族的父辈男性序称法等几例特殊的亲属称谓制度就能折射出不少现已不大采行或完全绝迹的婚姻家庭制度。     

Shaking the bad boys: troubling the criminalization of black boys’ childhood play,hegemonic white masculinity and femininity,and the school playground-to-prison pipeline

ABSTRACT

Few studies have sought to understand the childhood play experiences of Black boys in early childhood education (ECE), and a majority of those that investigate them often socially construct Black boys’ play as criminal, dangerous, and monstrous. Considering the dangers of hegemonic masculinity and femininity or the racial and gendered power and privilege White boys and girls bring to societal spaces including playgrounds, little is known about how such power influences the experiences of Black boys who play with them. In this conceptual paper, I draw on critical race theory (CRT) to trouble the criminalization of Black boys’ childhood play and hegemonic White masculinity and femininity, which can prove violent and dehumanizing to Black boys. As such, I suggest that similar to the school-to-prison pipeline (STPP), Black boys may become victims of what I call the school playground-to-prison pipeline (SPTPP) as a consequence of White children’s accusations, fears, misperceptions, and misreadings of Black boys’ play. Recommendations are provided for teacher and ECE to better support Black boys and the cross-cultural play interactions between them and White children.     

包头回族皮毛贸易(1879-1945)

道光三十年(1850年),包头便成为黄河中上游的水运货物集散地,作为边境贸易城镇的区位优越性更加明显体现出来,光绪五年(1879年)天津洋行买办到西北收购羊毛后,包头皮毛市场功能从产地市场向转运市场转变。民国11年(1923年)京包铁路通车后,两种最经济便捷的运输方式在包头汇集,连接着皮毛的产地市场和终端市场,包头成为北方广大地区的水陆交通中心和最大的皮毛集散地,引发黄河中上游地区商品流通渠道重大变迁。     

Multilevel Risk and Protective Factors for Intimate Partner Violence Among African,Asian, and Latina Immigrant and Refugee Women: Perceptions of Effective Safety Planning Interventions

Immigrant and refugee women are at high risk for intimate partner violence (IPV) and intimate partner homicide (IPH). Given the growing number of immigrants and refugees in the US and the concerns about IPV and IPH among immigrant and refugee groups, this paper aims to identify survivors and practitioners’ perceptions of (a) common and culturally specific risk and protective factors for IPV and IPH for immigrant and refugee women and (b) areas of safety planning interventions for survivors who are at risk for severe or lethal violence by an intimate partner. Qualitative data for this multi-site study were collected from women and practitioners residing in seven geographically diverse US locations. Eighty-three in-depth interviews were conducted with adult immigrant and refugee survivors of IPV, who identified as Asian (n?=?30), Latina (n?=?30), and African (n?=?23). Additionally, nine focus groups and five key informant interviews were conducted with practitioners (n?=?62) who serve immigrant and refugee survivors of IPV. Results revealed multilevel risk and protective factors for IPV/IPH found at the societal level (e.g., patriarchal cultural norms), relationship level (e.g., partner abusive behaviors), and individual level (e.g., acculturation in the US). These findings can inform the development of culturally responsive risk assessment and safety planning interventions across legal, social service, and healthcare settings.     

论明朝统治河湟及湟水流域藏族分布状况

作者从历史的角度 ,论述了明朝对河湟藏族的统治以及当时藏族在湟水流域的分布     

赖草的染色体组型及非整倍体

在减数分裂研究的基础上对赖草染色体组型、非整倍体进行了调查研究。结果表明：赖草（Aneurolepidiumdasystachys）的染色体组型公式为2n＝4x＝28＝28m（4SAT）。但核仁染色体数目有一定的变异，调查了80株，其中70％含有二对核仁染色体，30％含有一对核仁染色体。赖草群体中非整倍体频率较高，调查了191株，其中2n＝28（整倍体）占6963％，超倍体占2．61％，亚倍体占27．76％。通过观察分析认为，产生非整倍体的主要细胞学原因是减数分裂前期Ⅰ不联会或联会消失以及减数分裂不分离。亦对赖草的非整倍体分离和利用进行了探讨。     

紧算子的Riesz-Schauder理论及应用

本文总结了紧算子的Riesz—Schauder理论的主要结果 ,给出了线性算子方程解的存在唯一性的一般结果 ,讨论了第二型Fredhelm积分方程解的存在唯一性 ,并给出了一个充要条件     

Enabling,structuring and creating elite transnational lifestyles: intermediaries of the super-rich and the elite mobilities industry

ABSTRACT

This article considers how the migration industries lens can be usefully employed in understanding how professional intermediaries enable, structure, and create transnational migration lifestyles of the super-rich. In particular, we examine how intermediaries and their services (1) enable the continued sustenance of transnational migration lifestyles for this group of elites; and (2) structure and create elite transnational lifestyles. This article primarily draws on interviews with professional intermediaries who service the super-rich, and content analysis of their websites and brochures. Inspired by insights from the new mobilities paradigm (and in particular the politics of mobility), we argue for an expanded conceptualisation of the migration industries beyond the literature’s current focus on labour recruitment and migration management. Specifically, we suggest thinking of the migration industries as a collection of actors and services that enable, structure, and create different types of ‘migrants’, their spaces and their highly uneven transnational mobilities – including that of the super-rich and their elite transnational lifestyles. We conclude with suggestions for a research agenda that may help to better understand the role of intermediaries in the creation of differentiated mobilities.