从张大民的幸福观看民族文化的优根性——浅析《贫嘴张大民的幸福生活》

从文化积淀的角度探讨,张大民所处的社会环境和社会地位及其幸福观,既有民族文化的优根性,又有民族文化的劣根性,张大民具有以优根性为核心的一元为主,二元对立的矛盾性格。

500 kV变电站格构式变电构架最优根开研究

在500 k V变电构架的设计中,目前国内人字形构架柱和单钢管悬臂支架柱应用较为成熟,角钢格构式变电构架应用较少。在海外工程中,角钢运输具有较大优势。结合实际工程,以埃塞俄比亚某500 k V变电构架为实例,通过根开的有效组合,对21种不同根开的变电构架进行了全面的计算,以用钢量和混凝土用量为依据进行工程造价比较分析,得出了类似工程条件下的最优根开,以指导工程设计。当构架柱高约为30 m时,结合构架所处地理位置气候等条件,最优根开建议值为6.1 m×3.1 m,即长向根开约取为柱高的1/5,短向根开约取为柱高的1/10时,结构整体力学性能较好且最为经济。

当代文学视阈下中国形象的建构——以莫言小说为例

莫言作为中国当代文学领域极具影响力的作家,在小说中塑造了大量个性鲜明的人物形象,描绘了为正史所遮蔽的真实的中国民间社会形态。通过剖析莫言小说中充满蓬勃生命力的民间社会及优根性与劣根性并存的人物形象,探讨莫言"作为老百姓的写作"的文学立场,挖掘莫言小说在当前对外传播与交流背景下对于中国形象建构的价值所在。

论张大民

文章从文化积淀的角度入手 ,结合张大民所处的社会环境和社会地位 ,探讨张大民的幸福观 ,分析他那有民族文化的优根性 ,又有民族文化的劣根性 ,而以优根性为核心的一元为主、二元对立的矛盾性格 。

Differential Gene Expression Between Wheat Hybrids and Their Parental Inbreds in Primary Roots

To provide an insight into the molecular basis of heterosis, differential display of mRNA was used to analyze the difference of gene expression between wheat (Triticum aestivum L.) heterotic hybrid A, nonheterotic hybrid B and their parental inbreds in the primary roots. By using 5′ end random primers in combination with three one-base-anchored primers, it was found that 22.5% and 22.9% of 877 total displayed cDNAs were differentially expressed between hybrid A, B and their parents, respectively. Both quantitative and qualitative differences in gene expression between hybrids and their parental inbreds were obvious, indicating that the patterns of gene expression in hybrids alter significantly as compared to their corresponding parents. On the other hand, by using MADS-box gene specific 5′ end primer for DDRT-PCR, we found that nearly all of the displayed cDNA fragments were polymorphic between hybrids and their parents, and major difference occurred in qualitative level, in which hybrid specific-expressed and silenced genes are the major two patterns, suggesting that MADS-box gene may be important for manifestation of differential gene expression and wheat heterosis. In comparison with our previous results by using seedling leaves, it is indicated that differential gene expression between hybrids and parents is dependent on the tissues tested, and more differentially expressed genes were observed in the primary roots than in the seedling leaves. Therefore, it is concluded that the expressions of both randomly displayed cDNAs and transcription factor genes, such as MADS-box, alter significantly between hybrids and their parents, which might be responsible for the observed heterosis.

High-frequency Plant Regeneration from Leaf Cultures of Moringa oleifera Lam: a Multipurpose Plant

[Objective] The aim was to optimized and established the regeneration system of Moringa oleifera and provided foundation for its rapid propagation and further research. [Method] Tissue culture techniques and large scale micropropagation of M. oleifera were studied in this paper. By means of a series of experiments, we used the leaf of aseptic seedling from M. oleifera as explants to optimize and establish the regeneration system cultured in vitro by means of direct organogenesis. [Result] It was observed that using the fresh shelled M. oleifera seeds with 0.1% mercuric chloride for 6 minutes could reach the best disinfection effect. The seed germination rate was 85%. The leaf could produce cluster buds well using the medium with MS＋2.0 mg/L 6-BA＋0.05 mg/L NAA, while the best proliferation condition was under MS＋6-BA 1.0 mg/L＋KT 0.1 rag/L＋2, 4-D 2.0 mg/L＋NAA 0.05 mg/L. The best rooting induction culture medium was MS＋0.5 mg/L IBA, with the rooting rate as 100%. [Cenclusien] This protocol might find use in mass production of true- to-type plants and in production of transgenic plants through Agrobacterium/biolisticmediated transformation.

Process Optimization of Ultrasonic Extraction of Puerarin Based on Support Vector Machine

In ultrasonic extraction technology, optimization of technical parameters often considers extraction medium only, without including ultrasonic parameters. This paper focuses on controlling the ultrasonic extraction process of puerarin, investigating the influence of ultrasonic parameters on extraction rate, and empirically analyzing the main components of Pueraria, i.e., isoflavone compounds. A method is presented combining orthogonal experi- mental design with a support vector machine and a predictive model is established for optimization of technical parameters. From the analysis with the predictive model, appropriate process parameters are achieved for higher extraction rate. With these parameters in the ultrasonic extraction of puerarin, the experimental result is satisfactory. This method is of significance to the study of extracfing root-stock plant medicines.

Establishment and tests of EnOI assimilation module for WAVEWATCH Ⅲ

In this paper, we propose a parallel data assimilation module based on ensemble optimal interpolation （EnOI）. We embedded the method into the full-spectral third-generation wind-wave model, WAVEWATCH III Version 3.14, producing a wave data assimilation system. We present our preliminary experiments assimilating altimeter significant wave heights （SWH） using the EnOI-based wave assimilation system. Waters north of 15°S in the Indian Ocean and South China Sea were chosen as the target computational domain, which was two-way nested into the global implementation of the WAVEWATCH III. The wave model was forced by six-hourly ocean surface wind velocities from the cross-calibrated multi-platform wind vector dataset. The assimilation used along-track SWH data from the Jason-2 altimeter. We evaluated the effect of the assimilation on the analyses and hindcasts, and found that our technique was effective. Although there was a considerable mean bias in the control SWHs, a month-long consecutive assimilation reduced the bias by approximately 84% and the root mean-square error （RMSE） by approximately 65%. Improvements in the SWH RMSE for both the analysis and hindcast periods were more significant in July than January, because of the monsoon climate. The improvement in model skill persisted for up to 48 h in July. Furthermore, the SWH data assimilation had the greatest impact in areas and seasons where and when the sea-states were dominated by swells.

现实主义与“现时主义”

“现实主义”这个词在文学界已经好久不见人提了,记得冯牧先生在世时,曾在92年的一个会议上说《凤凰琴》是新时期以来的“现实主义”的代表作。我当时在场,听了后不禁有些心惊肉跳之感。现实主义作为一种文学流派,从来都是存在的,然而不知为什么仿佛在一夜之间,“现实主义”突然消失了。在文学的空间里,只是偶然才能见到它们沾满尘垢地塞在一处处宛如商业街精品店处所的角落里。

Arbuscular mycorrhizal fungi enhance the growth of the exotic species Ambrosia artemisiifolia

Arbuscular mycorrhizal fungi(AMF)can increase host plant nutrient uptake via their mycelium,thus promoting plant growth.AMF have always been associated with successful invasion of most exotic plant species.However,knowledge regarding how AMF affect the success of plant invasion remains limited.Exotic Ambrosia artemisiifolia is an invasive and mycorrhizal plant species.A long-term field experiment was conducted to examine the differences in AMF diversity and composition in the roots of A.artemisiifolia and Setaria viridis subjected to interspecific competition during growth.A greenhouse experiment was also performed to test the effect of Funneliformis mosseae on the growth of these two species.Ambrosia artemisiifolia invasion caused AMF diversity to change in native S.viridis roots.Meanwhile,the relative abundance of F.mosseae was significantly higher in the roots of A.artemisiifolia than in those of S.viridis.The higher AMF colonization rate in the exotic species(A.artemisiifolia)than in the native species(S.viridis)was found in both the field and greenhouse experiments.The greenhouse experiment possibly provided that AMF advantaged to the growth of A.artemisiifolia,by influencing its photosynthetic capacity as well as its phosphorus and potassium absorption.These observations highlight the important relationship of AMF with the successful invasion of A.artemisiifolia.