DIODER-PUMPED SELF-Q-SWITCHED Cr~(4 ),Nd~(3 ):YAG LASER WITH AMPLIFIER

ＩＮＴＲＯＤＵＣＴＩＯＮＣｒ4 :ＹＡＧｃｒｙｓｔａｌｓｈａｄｂｅｅｎｗｉｄｅｌｙｕｓｅｄａｓｓａｔｕｒａｂｌｅａｂｓｏｒｂｅｒｓｆｏｒｆｌａｓｈｌａｍｐｐｕｍｐｅｄｏｓｃｉｌ ｌａｔｏｒａｎｄＭＯＰＡｓｙｓｔｅｍｓ (Ｓｈｉｍｏｎｙｅｔａｌ.,1 995,1 996,Ｅｉｃｈｌｅｒ,1 994 ,1 995,Ｙａｎｋｏｖ,1 994 )ａｓｗｅｌｌａｓｉｎｄｉｏｄｅｐｕｍｐｅｄｌａｓｅｒｓ(Ｚａｙｈｏｗｓｋｉｅｔａｌ.,1 994 ) .Ｔｈｅｙｐｒｅｓｅｎｔｅｄａｎｅａｓｙｗａｙｔｏｇｅｎ ｅｒａｔｅｐａｓｓｉｖｅｌｙＱ ｓｗｉｔｃｈｅｄｌａｓｅ…     

针对CET-4作文评分原则提高写作技巧

本文通过分析大学英语四级作文的评分原则，针对优等作文的评分标准，介绍了一系列四级作文的应试技巧，即通过审题、写好主题句和扩展句、简化词句、用好过渡词和过渡句、避免多余和累赘等方法，为大学英语四级应试者指点迷津，帮助应试者提高应试技巧，写出优等作文。     

Increased expression of aquaporin-4 in human traumatic brain injury and brain tumors

Objective:To characterize the expression of aquaporin-4(AQP4),one of the aquaporins(AQPs),in human brainspecimens from patients with traumatic brain injury or brain tumors.Methods:Nineteen hnman brain specimens were obtahledfrom the patients with traumatic brain injury,brain tumors,benign meningioma or early stage hemorrhagic stroke.MRI or CTimaging was used to assess brain edema.Hematoxylin and eosm staining were used to evaluate cell damage,Immunohistochem-istry was used to detect the AQP4 expression.Results:AQP4 expression was increased from 15 h to at least 8 d after injury.AQP4immunoreactivity was strong around astrocytomas,ganglioglioma and metastatic adenocarcinoma.However,AQP4 immunore-activity was only found in the centers of astrocytomas and ganglioglioma,but not in metastatic adenocarcinoma derived from lung.Conclusion:AQP4 expression increases in human brains alter traumatic brain injury,within brain-derived tumors,and aroundbrain tumors.     

五四时期知识分子对社会习俗演进的影响

五四时期是中国历史上激烈变革的时代,自西学东渐之时也伴随着西俗东渐的过程。由于中国旧的传统礼俗与现代生活方式格格不入,一批先进的知识分子继承并发展了自鸦片战争以来特别是辛亥革命后中国社会传统习俗演进的丰硕成果,使得我国社会习俗的西化过程基本上沿着文明、进步的正确方向迈进。     

Synthesis of 3-Alkyl-5-Benzylidene-2,4-Thiazolidinedione Under Microwave Irradiation

5 Benzylidene 2 ,4 thiazolidinedionederivativesarere portedtohavediversebiologicalactivities[1] suchasantidia betic[2 ] ,antibacterial[3] andanticonvulsant[4 ] activities .Forexample,pioglitazoneandrosiglitazonehavebeenlaunchedrecentlyfortypeⅡdiabetesmellitus[2 ] .Theyalsocanbeusedforthetreatmentofpsoriasis[5] andobesity[6 ] .　　Thegeneralmethodsforthesynthesisof 5 benzylidene 2 ,4 thiazolidinedionewasKnoevenagelcondensationof 2 ,4 thiazolidinedionewitharomaticaldehyde .　　Inrecentyear…     

英语专业四级写作应试指导策略

英语专业四级写作应试指导,应基于《高校英语专业四级考试大纲》,准确把握学生习作中存在的问题,通过精心设计训练模式和优化习作批改和评讲,在考前强化学生的写作训练,方能达到事半功倍的效果。     

Exploring pedagogical relationships in the context of free play

Early childhood advocates agree that positive teacher–child relationships are critical to classroom quality. Much research has emphasized quantifiable teacher characteristics and child outcomes without fully capturing the complexity of these relationships. Drawing on extensive classroom observations, two video-recorded free play sessions and teacher interviews, this study explored some of the ways that preschool teachers create and maintain positive relationships, with emphasis on how they care for the children: their ways of being with and for them. The results of this study provide practical examples for building and sustaining teacher–child relationships, help delineate the complexity of the relationships that exist in preschool classrooms and demonstrate the everyday ways in which those relationships are foundational for children’s learning and development.     

A novel long-chain acyl-derivative of epigallocatechin-3-O-gallate prepared and purified from green tea polyphenols

Lipophilic tea polyphenols (LTP) were prepared by catalytic esterification of green tea polyphenols (GTP) with hexadecanoyl chloride. A novel long-chain acyl-derivative of epigallocatechin-3-o-gallate (EGCG) was first isolated from purification of LTP by high-speed countercurrent chromatography (HSCCC) using a solvent system composed of n-hexane-ethyl acetate-methanol-water (1∶1∶1∶1, v/v). The molecular structure of the acyl-derivative, Epigallocatechin-3-O-gallate-4′-O-hexadecanate, was elucidated by means of elemental analysis, IR,¹H-NMR and MS spectra. Project (No. 200010) supported by Zhejiang Provincial Natural Science Foundation, China     

An optimal quality adaptation mechanism for end-to-end FGS video transmission

In this paper, we propose a novel optimal quality adaptation algorithm for MPEG-4 fine granular scalability (FGS) stream over wired network. Our algorithm can maximize perceptual video quality by minimizing video quality variation and increasing available bandwidth usage rate. Under the condition that the whole bandwidth evolution is known, we design an optimal algorithm to select layer. When the knowledge of future bandwidth is not available, we also develop an online algorithm based on the optimal algorithm. Simulation showed that both optimal algorithm and online algorithm can offer smoothed video quality evolution.     

Construction of recombinant industrial Saccharomyces cerevisiae strain with bglS gene insertion into PEP4 locus by homologous recombination

The bglS gene encoding endo-1,3-1,4-β-glucanase from Bacillus subtilis was cloned and sequenced in this study. The bglS expression cassette, including PGK1 promoter, bglS gene fused to the signal sequence of the yeast mating pheromone α-factor (MFals), and ADH1 terminator with G418-resistance as the selected marker, was constructed. Then one of the PEP4 allele of Saccharomyces cerevisiae WZ65 strain was replaced by bglS expression cassette using chromosomal integration of polymerase chain reaction (PCR)-mediated homologous recombination, and the bglS gene was expressed simultaneously. The recombinant strain S. cerevisiae (SC-βG) was preliminarily screened by the clearing hydrolysis zone formed after the barley β-glucan was hydrolyzed in the plate and no proteinase A (PrA) activity was measured in fermenting liquor. The results of PCR analysis ofgenome DNA showed that one of the PEP4 allele had been replaced and bglS gene had been inserted into the locus of PEP4 gene in recombinant strains. Different endo-1,3-1,4-β-glucanase assay methods showed that the recombinant strain SC-βG had high endo-1,3-1,4-β-glucanase expression level with the maximum of 69.3 U/(h-ml) after 60 h of incubation. Meanwhile, the Congo Red method was suitable for the determination of endo-1,3-1,4-β-glucanase activity during the actual brewing process. The current research implies that the constructed yeast strain could be utilized to improve the industrial brewing property of beer.