高校课堂教学中的思想流与问题流管理智慧

高校课堂教学管理是教师管理智慧的集中体现,如何寓“管”于“不管”之中,不仅是一门学问, 更是一门艺术。学生是课堂教学生产的产品,自己参与自己的生产过程,具有自生产性,学生的思想决 定其行为举止。学生身上存在着天赋的、待开发的思想种子,教师的课堂教学引领着学生思想流的方 向。学生的思想流奏响课堂教学的主旋律,教师要引导学生树立追求真理思想、“人主义”思想和“五 I” 教学思想,让学生全神贯注于课堂学习之中。高校课堂教学具有极强的自组织力,教师个体的教学能力 直接影响教学效果。“人”和“问”是高校课堂教学的关键词,教师指引学生学着问,在问中学。课堂教学 就是一个一个的问题串,形成问题流,彰显课堂教学的智慧与良知。

The expression of the jigging bed porosity and its realizing of the computer detection system

This paper proposes the expression of the jigging bed porosity based on the jumping height of the jigging bed and water wave. This kind of expression can help to realize the jigging process automation and intelligence. The computer detection system is also developed.

Three Decades of External Imbalances and Macroeconomic Fundamentals： The Case of Turkey

The paper aims to investigate the current account imbalances in the context of an overview of macroeconomic fundamentals after the liberalization process in Turkey. Two main questions discussed here are： （1） What is the link between liberalization and current account imbalances; （2） What kind of mechanisms ensured this link to become a vicious circle. The period after 1989, Turkey was characterized by significant fluctuations in macroeconomic activity by the implementation of liberalization policies. Once financial liberalization is adopted, Turkey faced with a new challenge： large current account deficits. On the other hand, foreign capital inflows aggravated a lending boom. Because of excessive risk taken by banks, interest rates began to rise. As mentioned above, the paper studies Turkey＇s liberalization process with a number of indicators that point to a fragility of the external balance： unhealthy structure of financial sector, particularly banking sector, large fiscal imbalances, low savings and investment rates, unstable GDP growth. Domestic structural features combining with macroeconomic policy stance and political factors are examined as well

Properties of Fresh and Hardened Self-compacting Concrete Produced by Using Locally Available Materials

Self-compacting concrete （SCC） is defined so that no vibration is necessary for the compaction. The main criteria of producing SCC have to satisfy the following characteristics [1, 2, 3]： （1） Ability to flow into and completely fill complex forms under its own weight; （2） Ability to pass through and bond to congested reinforcements; （3） High resistance to aggregate segregation. Self-compacting concrete presents a significant sign in improving the product quality and efficiency of the building industry. It also enhances the working conditions and the quality and appearance of concrete. Japan has been used self-compacting concrete in bridge, building and tunnel construction since the early 1990s. In the last decade, SCC has been produced a high potential for greater acceptance and wider applications in highway bridge construction in the Europe and U.S.. However, till now, there is no application of SCC in the construction industry in Egypt. Therefore, the main objective of this research is to produce SCC by using the locally available materials in our region such as basalt, gravel, sand, limestone powder and silica fume. Experimental programme was designed to characterize the properties of fresh and hardened SCC. It comprises different concrete mixes thbricated with different types and percentages of constituent materials. Three full-scale reinforced concrete beams were fabricated from the SCC mixes and tested under flexure. For the purpose of comparison, an extra RC beam was made of conventional normal concrete to serve as a reference beam. This study, in general, demonstrated that the applications of SCC in construction industry oiler products with enhanced characteristics as well as could be economical.

Self-Optimizing Flexible Assembly Systems

Today＇s production systems are demanded to exhibit an increased flexibility and mutability in order to deal with dynamically changing conditions, objectives and an increasing number of product variants within industrial turbulent environments. Flexible automated systems are requested in order to improve dynamic production efficiency, e.g. robot-based hardware and PC-based controllers, but these usually induce a significantly higher production complexity, whereby the efforts for planning and programming, but also setups and reconfiguration, expand. In this paper a definition and some concepts of self-optimizing assembly systems are presented to describe possible ways to reduce the planning efforts in complex production systems. The concept of self-optimization in assembly systems will be derived from a theoretical approach and will be transferred to a specific application scenario---the automated assembly of a miniaturized solid state laser--where the challenges of unpredictable influences from e.g. component tolerances can be overcome by the help of self-optimization.

Biologically Active Substances from Higher Fungi

As a part of our search for naturally occurring bioactive metabolites of mushrooms,we have in- vestigated the chemical constituents of more than 100 Basidiomycetes and Ascomycetes fungi,and isolated over 300 including 150 new terpenoids, phenolics and nitrogen-containing compounds.The isolation,structural elucidation and biologically ac- tivity of the natural products from the higher fungi are briefly discussed.

The two Kantian notions of causality： an analytic enquiry

In response to the tricky problem, raised by Hume, of the relationship between causality and freedom, Kant came up with the concept of two kinds of causality： causality of nature and causality of freedom. While the former belongs in the phenomenal realm in the context of speculative reason, the latter, no more than a negative notion in the transcendental realm of things-in-themselves, nevertheless acquires actual objectivity in the context of practical reason. What causality of freedom confirms is freedom in the transcendental rather than the psychological sense. As Kant saw it, these two kinds of causality coexist in divided form in man, who is an existing being both in the realm of phenomena and in that of things-in-themselves. After Kant, it was Marx who, critically synthesizing the contributions of Hegel and Sehopenhauer, succeeded in revealing the hidden answer to the question of Kant＇s concept of two kinds of causality. That is productive labor, which implies both the dimension of goals and the causality of freedom and that of the causality of nature and historical causality. In the context of Marx＇s historical materialism, productive labor emerges as a kingdom of necessity at the very basis of the kingdom of freedom.

Assessment of effectiveness of nature reserves on the Tibetan Plateau based on net primary production and the large sample comparison method

Twenty-one typical coupled large samples were chosen from areas within and surrounding nature reserves on the Tibetan Plateau using the large sample comparison method(LSCM).To evaluate the effectiveness of the nature reserves in protecting the ecological environment,the alpine grassland net primary production(NPP) of these coupled samples were compared and the differences between them before and after their establishment as protected areas were analyzed.The results showed that:(1) With respect to the alpine grassland NPP,the ecological and environmental conditions of most nature reserves were more fragile than those of the surrounding areas and also lower than the average values for the Tibetan Plateau.(2) Of the 11 typical nature reserves selected,the positive trend in the NPP for Manzetang was the most significant,whereas there was no obvious trend in Taxkorgan.With the exception of Selincuo,the annual NPP growth rate in the nature reserves covered by alpine meadow and wetland was higher than that in nature reserves consisting of alpine steppe and alpine desert.(3) There were notable findings in 21 typical coupled samples:(a) After the establishment of the nature reserves,the annual rate of increase in the NPP in 76% of samples inside nature reserves and 82% of samples inside national nature reserves was higher than that of the corresponding samples outside nature reserves.(b) The effectiveness of ecological protection of the Mid-Kunlun,Changshagongma,Zoige and Selincuo(Selin Co) nature reserves was significant; the effectiveness of protection was relatively sig-nificant in most parts of the Sanjiangyuan and Qiangtang nature reserves,whereas in south-east Manzetang and north Taxkorgan the protection effectiveness was not obvious.(c) The ecological protection effectiveness was significant in nature reserves consisting of alpine meadow,but was weak in nature reserves covered by alpine steppe.This study also shows that the advantage of large sample comparison method in evaluating regional ecology change.Careful design of the samples used,to ensure comparability between the samples,is crucial to the success of this LSCM.