Academic literature on the topic 'San nong wen ti'

This study focuses on the effectiveness of schema theories to improve the ability of classical Chinese reading comprehension of Hong Kong secondary three students. A classical Chinese reading course is therefore setup to demonstrate the Chinese cultural schema (hereinafter referred to as “the course”). The result will be discussed below. Quasi-experimental research method is used in this study. Students are divided into two groups: experimental group and control group. They are compared in pre-test and post-test to evaluate the effectiveness of the course. In addition, individual interviews and questionnaires are conducted both before and after the course of Chinese cultural schema to experimental group in order to learn more their opinions in Chinese culture, reading classical Chinese and the course. It is shown that both “basic reading comprehension ability” (“understanding of basic / surface meaning”) and “advanced reading comprehension ability” (“understanding of implicit meaning”) are improved, in which “advanced reading comprehension ability” is ameliorated particularly. For the ability of “constructing new knowledge and personal views”, however, the improvement is not outstanding enough. It is also found that students are more interested in Chinese culture and reading classical Chinese after the course. The result of Chinese cultural schema takes time to reflect. Teachers are encouraged to help students by revision and link up to previous schemas. Once students’ knowledge is reinforced, there will be a fundamental change in their way of thinking. It enhances the course’s effectiveness and makes it more long-lasting. 本研究旨在應用圖式理論，設計一個以建構中國文化圖式為主的文言文閱讀課程(下稱：「中國文化圖式課程」)，藉以探討該類課程對提升香港中三學生文言文閱讀能力的成效。 研究主要運用準實驗研究的方法，透過比對實驗組學生和對照組學生前、後測的成績，藉以評定中國文化圖式課程的成效。此外，為進一步了解學生對中國文化、古典作品，以及是次實驗課程的看法，研究員亦於實驗前、後，向實驗組學生各進行了一次訪談及問卷調查。 研究結果顯示，中國文化圖式課程對提升香港中三學生文言文的「基本閱讀能力」(理解基本/表層文意) 和「深層閱讀能力」(理解篇章深層意義)，均有一定的成效；當中，尤以「深層閱讀能力」的成效最為顯著。至於「讀者層閱讀能力」(建構個人新知識及看法) 方面，於是次研究中，則暫未見顯著成效。此外，研究結果亦發現，學生於課程完結後，對中國文化及古典作品的興趣，亦有一定程度的提升。 圖式建構絕非一朝一夕的，教師在教學的過程中，宜反覆重溫、連繫學生的已有圖式，如是，學生的思維才能出現本質上的改變，而課程的成效也才能變得更加持久。
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In 2007 the Chinese government nationally implemented the rural dibao programme. The chapter argues that while the circumstances of rural dibao’s implementation were different from its urban predecessor there are three striking similarities. First, in terms of values, it is argued that the rural dibao programme did fit comfortably with the agenda under Hu Jintao and Wen Jiabao to address China’s unequal development and in particular the san nong wenti of the countryside. However, the process surrounding implementation of the rural programme also carried appeals to social stability. Second, the political structure had a significant impact on the implementation of the rural MLG. As with the urban programme implementation faced local intransigence. This was overcome by not only using similar means as with the urban programme; but also through explicitly dealing with one common source of problems, funding. Finally, there is the problem of administrative capacity in running the rural MLG programme. This appears as a classic outcome of the fragmented political and decision making structure in China where local government, often struggling to meet mandates passed down from above, prioritises the resources it has. What this all shows is that the challenges facing social assistance in China are not specific to the urban or the rural programme; but are a consequence of the structure of the state.

The microstructure, mechanical response, and failure behavior of lead free solder joints in electronic assemblies are constantly evolving when exposed to isothermal aging and/or thermal cycling environments. In our prior work on aging effects, we have demonstrated that large degradations occur in the material properties (stiffness and strength) and creep behavior of Sn-Ag-Cu (SAC) lead free solders during aging. These effects are universally detrimental to reliability and are exacerbated as the aging temperature and aging time increases. Conversely, changes due to aging are relatively small in conventional Sn-Pb solders. In our current work, we are exploring several doped SAC+X alloys in an attempt to reduce the aging induced degradation of the material behavior of SAC solders. The doped materials are lead free SAC solders that have been modified by the addition of small percentages of one or more additional elements (X). Using dopants (e.g. Bi, In, Ni, La, Mg, Mn, Ce, Co, Ti, Zn, etc.) has become widespread to enhance shock/drop reliability, wetting, and other properties; and we have extended this approach to examine the ability of dopants to reduce the effects of aging and extend thermal cycling reliability. In this paper, we concentrate on presenting the results for SAC+X (X = Zn, Co, Ni). The enhancement of aging resistance for the doped lead free solders was explored. Comparisons were made to the responses of non-doped SAC lead free solder alloys. The effects of aging on mechanical behavior have been examined by performing stress-strain and creep tests on solder samples that were aged for various durations (0–6 months) at elevated temperature (100 °C). Variations of the mechanical and creep properties (elastic modulus, yield stress, ultimate strength, creep compliance, etc.) were observed and modeled as a function of aging time and aging temperature. Our findings show that the doped SAC+X alloys illustrate reduced degradations with aging for all of the aging temperatures considered. Also, the stress-strain and creep mechanical properties of doped solders are better than those of reference solders after short durations of aging. After long term aging, doped solder alloys were found to have more stable behaviors than those of the standard SAC alloys. A parallel microstructure study has shown that less degradation and coarsening of the phases occurs in doped solder materials relative to non-doped solders after severe aging.

Development of intelligent and ecological energy absorption systems (EAS) is important to various fields such as automotive (vehicle suspensions, bumpers, engine mounts), construction (protections against seismic and wind-induced vibrations), and defense (parachuted objects, armors). Usual EAS use composites, shape-memory alloys and foams. Recently, liquid adsorption/desorption in/from nanoporous solids was employed to develop high-performance nano-EAS. Energy loss is based on the well-known capillary phenomenon: external work must be done to spread a non-wetting liquid on a solid surface. Nano-EAS provide considerably higher dissipated energies, about 1–10J/g at deformability of 30–70%, compared with the energy absorption of Ti-Ni alloys, about 0.01–0.05J/g at deformability of 5–8%. For water against hydrophobic nanoporous silica gel (artificial sand), the nano-EAS become ecological; they can be also made intelligent by thermo-electrical control. Relative to thermal effects, Qiao et al. have investigated, for nanoporous silica gel with insufficient coverage of the alkyl-based hydrophobic coating, the problem of hysteresis recovery by increasing the temperature in the range 20∼80°C. Energy loss capacity reduced severely after the first loading-unloading cycle, so, the hysteresis was found as irreversible. Shape of the first hysteresis, the accessible specific pore volume and the desorption pressure were almost unaffected by the temperature change. At temperature augmentation the second hysteresis was partially recovered and when the temperature exceeded 50°C the system became almost fully reusable. Water inflow was found as governed by Laplace-Washburn equation but the outflow process was perceived as thermally aided. On the other hand, Eroshenko et al. have contradictorily obtained for nanoporous silica gel with full coverage of the alkyl-based hydrophobic coating, a stable hysteresis at repeated working cycles. Adsorption pressure decreased and desorption pressure increased at temperature augmentation, this producing a reduction of the hysteresis area and damping. However, the accessible specific pore volume was found as thermally unaffected. Oppositely, both the in- and out-flows were found as governed by Laplace-Washburn equation. In this work, for nanoporous silica gels with partial and full coverage of the alkyl and fluorocarbon based hydrophobic coatings, the thermal effects on the hysteresis and damping performances are studied. Test rig used is a compression-decompression chamber introduced inside of an incubator that allows temperature adjustment in the range of −10∼50°C. Results reveal that, depending on the hydrophobic coating coverage, findings reported by Qiao et al. and Eroshenko et al. are in fact not contradictory but complementary. However, as expected, the accessible specific pore volume was found to decrease at temperature reduction. In order to explain all these apparently opposite experimental findings, a model based on the water cluster size distribution versus temperature, the pore size distribution of silica gel and the ability of water molecules to form hydrogen bonds with the uncovered hydroxyl groups on the solid surface is proposed.