浅谈“助学课堂”如何把握问题设置的度

助学课堂突出以问为主轴启动学生思维,以思为主攻促进学生发展,鼓励教师巧设关键问题、坡度问题,逐步激发学生学习的主动性和创造性,使学生由被动接受型转为主动发展型。教师在助学课堂教学中,要把握好问题设置的角度、难度、跨度、梯度、广度、密度等问题,才能有效地启迪学生思维,使学生的思维活动逐渐由已知导向未知,达到释疑、解惑的目的,实现知识的迁移和能力的飞跃。     

关于电磁理论中矢量符号法的一些研究

对文献[6,8]的符号矢量法进行了较深入的分析和研究后,发现原有的理论还存在一些需要改进的地方,在此基础上提出了一些建议。关于符号矢量法的命名问题、定义式中所包含的物理意义、三个基本算符的使用限制以及它们的命名问题都进行了完整的论述,使这套理论体系更加完善、合理。     

信号测不准原理的量子诠释

根据量子力学的测不准原理,采用力学量算符的方法得到了信号在时频分析时的测不准原理,并对该原理进行量子诠释,认为信号在某种意义下可以看作是一个存在波粒二重性的类量子系统,正是由于信号的波粒二重性导致无法同时准确地测定信号的时间和频率。在证明信号测不准原理的同时得到了信号的频率算符,该算符具有广阔的理论应用前景。信号的量子诠释在揭示信号量子本质的同时,为量子力学中的理论框架应用于信号处理提供了理论支持。     

Estimating Benchmark Exposure for Air Particulate Matter Using Latent Class Models

We performed benchmark exposure (BME) calculations for particulate matter when multiple dichotomous outcome variables are involved using latent class modeling techniques and generated separate results for both the extra risk and additional risk. The use of latent class models in this study is advantageous because it combined several outcomes into just two classes (namely, a high‐risk class and a low‐risk class) and compared these two classes to obtain the BME levels. This novel approach addresses a key problem in risk estimation—namely, the multiple comparisons problem, where separate regression models are fitted for each outcome variable and the reference exposure will rely on the results of the best‐fitting model. Because of the complex nature of the estimation process, the bootstrap approach was used to estimate the reference exposure level, thereby reducing uncertainty in the obtained values. The methodology developed in this article was applied to environmental data by identifying unmeasured class membership (e.g., morbidity vs. no morbidity class) among infants in utero using observed characteristics that included low birth weight, preterm birth, and small for gestational age.     

Reconfiguring Queer Asia as Disjunctive Modernities: Notes on the Subjective Production of Working-Class Gay Men in Hong Kong

ABSTRACT

Informed by the framing of queer Asia as disjunctive modernities, this article argues for the analytic relevance of class to Hong Kong queer culture amid proliferating sexual progress. Based on ethnographic research concerning a support group for middle-aged, working-class gay men in a non-governmental organization (NGO), the findings demonstrate how their understanding and experiences of class were displaced into the culturally specific discourses of aging and generational difference. By examining the ideological work underlying three sets of local discourses (namely, generational experiences, urban redevelopment, and industrial transformation), the analysis reveals a temporal logic of class relation that governed the informants’ class displacements and, in turn, safeguarded the reproduction of inequalities in their lives. This article concludes by highlighting the interferential potential of class for understanding the queer cultural and subjective formations in other East Asian societies that went through similar processes of postwar economic development and class formation.     

Telling a modest story: accounts of men's upward mobility from the National Child Development Study

While the pattern of social mobility in postwar Britain has been extensively studied, revealing considerable upward mobility, much less is known about the subjective dimension to mobility. In this article, we employ a new sample of in-depth interviews with 50-year old men from the National Child Development Study to examine in detail the link between objective mobility patterns and the way the upwardly mobile narrate their life trajectories. In contrast to the mobility ideology suggested by the Oxford mobility survey of the early 1970s, in which the upwardly mobile recognized and internalized their success as a project of the self, we report how members of this later generation of men with highly successful careers prefer instead to articulate 'modest' life stories. By treating the career as a narrative device, we are able to show how the disavowal of the dominant, linear hierarchical career model by these men allows them to tell particular and distinctive stories which establish their individuality and personhood, while, paradoxically, recognizing the cultural power of the dominant model. In particular, we highlight the use of 'linear contingent' narratives by these men, in which specific events, especially those connected with occupational and geographical transitions, are deployed as contingent thresholds to mark out key shifts and passages in their lives. We then compare their accounts with those of immobile and downwardly men, who instead deploy 'ghostly' stories, preoccupied by the past, or defensive accounts, displaying unease with their failure to live up to the expectations of the linear career model. Having shown that men's accounts of mobility are suffused with an awareness of their need to establish their own individuality through repudiating the social trope of the instrumental careerist, we conclude that the links between career identities and objective mobility patterns are not straightforward and need careful unravelling.     

Coming of Age in the Bubble: Suburban Adolescents' Use of a Spatial Metaphor as a Symbolic Boundary

This article explores how suburban middle‐class adolescents use a spatial metaphor, “bubble,” as a symbolic boundary. The narratives about the bubble, collected through focus group discussions and ethnographic observations, show consensus among the teenagers about the socioeconomic and cultural superiority of the community, but they also reveal opposing views on its moral status. I also find that the teens use the same metaphor to draw moral distinctions among their peers, based on whether they align their identity with the norms and values the bubble symbolizes. I argue that the adolescents living in this community develop a strong place identity, even when they identify flaws with it, because their mundane references to the bubble provide them with an opportunity to critically examine the implication of their middle‐class status.     

Why Parents Pay for College: The Good Parent,Perceptions of Advantage,and the Intergenerational Transfer of Opportunity

This article asks how parents think about the cost of a college education for their children. Based on data from more than ninety in‐depth interviews with upper‐middle‐class parents and children, it is clear that grooming children for college and then paying for their education is intimately linked with ideas about being a “good parent.” We present data on three related aspects of parents' consciousness about paying for college. First, data are presented on how parents view the benefits of college for their children. Second, data illustrate how parents think about the obligations associated with paying. Third, we report on what parents expect in return for their efforts and expenditures. Data also indicate that parents' views are contingent on their perceived ability to pay for the increasing costs of higher education. We conclude by considering how the implicit contract between upper‐middle‐class parents and children may change as new economic and structural uncertainties increase parents' anxieties and challenge their abilities to see themselves as good parents.     

基于词法分析器自动产生原理的词法分析类库的构造

类库在编译程序的面向对象构造过程中起重要作用,词法分析类库是编译类库的重要组成部分。以词法分析器的自动产生原理为基础给出了词法分析类库的一种构造方法。