Si/SiN_x多层膜能带结构的理论研究

利用Kronig-Penney模型计算了Si/SiNx多层膜结构中Si亚层的能带结构.结果表明,无论是减少Si或Si/SiNx亚层的厚度都将导致Si层的带隙发生宽化,计算结果与实验值符合较好.进而还发现,当Si层厚度减小时,Si/SiNx多层膜结构中载流子(电子和空穴)的有效质量均减小,有利于对载流子复合发光的控制.计算结果对实验上研究发光可控的Si/SiNx多层膜结构有重要指导意义.     

Effect of intermittent aeration on the treatment performance in a submerged membrane bioreactor

In order to improve removal for nitrogen in a pilot-scale submerged membrane bioreactor (SMBR), intermittent aeration was conducted, and the effect on the treatment performance under four kinds of operation condition (run 1, continuous aeration; run 2, 60/60 min aeration on/off time; run 3, 60/90 min aeration on/off time; run 4, 60/75 min aeration on/off time) was evaluated. The results showed that depending on the specific on/off of the aeration time ratio, removal efficiency of nitrogen could be improved significantly, and the removal rates of total nitrogen (TN) under different operation conditions were 28.0%, 59.5%, 66.8% and 70.7%, respectively. There were no obvious differences for removal rates for COD_Cr and ammonia among different operation conditions. In general, intermittent aeration could be used as a feasible way to improve treatment performance for nitrogen in the SMBR.     

Identification of susceptibility genes loci associated with type 2 diabetes

In this study, we selected 10 susceptible SNPs loci to investigate their contribution to susceptibility to type 2 diabetes in Han Chinese among Hubei population. We genotyped SNPs rs5219, rs1801282, rs1470579, rs1111875, rs1081661, rs7754840, rs4506565, rs13266634, rs4402960, and rs5643981 by using the method of polymerase chain reaction-ligase detection reaction (PCR-LDR). In a case-control study, we have genotyped the 10 candidate susceptibility SNP loci, and here, we reported that the SNP rs5219 in KCNJ1...     

云南松优良家系超级苗选择研究

 为探讨云南松苗期选择的依据和标准,加速现有优良遗传资源的早期、短期开发利用,对20个家系1 a苗木的生长性状差异进行了分析.结果表明:家系之间以及同一家系不同个体之间的苗高、地径生长量存在极显著差异,且苗高生长量差异明显大于地径生长量.因此,以各家系平均高生长量加1倍标准差为最低标准进行超级苗选择,在11 331株育种群体中共选超级苗1 629株,入选率为14.3%.其中,超级苗平均高度为8.92 cm,比育种群体平均高度增加35.9%;超级苗平均地径为3.50 mm,比育种群体平均地径增加3.6%.     

从原型理论视角解读郝思嘉性格的矛盾性

根据荣格的"原型"理论重新审视《飘》中的女主人公郝思嘉的矛盾性格,发现美国南方社会传统与主人公强烈的个人意识的斗争造成其性格的矛盾性,而最终其个人意识战胜传统束缚,这使得郝思嘉成为文学史上光辉的女性形象。     

全长人PPAR-γ的表达、纯化与结构确证

目的建立表达、纯化结构完整的全长人PPAR-γ的方法。方法构建pReceiver-B01-PPAR-γ质粒并转化E．coliBL21（DE3）细胞，诱导表达重组蛋白，优化细胞生长条件；利用亲和色谱和尺寸排阻色谱纯化重组蛋白；胶内酶解重组蛋白，用离子阱质谱仪分析二维AgilentHPLC-Chip纯化的酶解片段；基于MS／MS搜索IPI、Swiss．Prot、NCBInr和MSDB数据库，鉴定重组蛋白。结果在优化的细胞生长条件（TB介质、37℃、0．8mMIPTG、诱导3h），从每升TB中可获得280mg重组蛋白；两步纯化后，获得176mg、纯度为95％的均质重组PPAR-γ蛋白；经质谱分析和搜索蛋白质数据库，获得均匀地分布在整个PPAR-γ多肽链中的33个阳性肽段，覆盖率为60％，表明重组蛋白为结构完整的全长人PPAR-γ。配体结合活性位点S289、H323、H449和Y473无突变，保证全长人PPAR-γ与配体结合的生物学活性。结论本文所建立的方法能成功用于大量表达结构完整的全长人PPAR-γ，有利于进一步的结构、功能研究和活性配体的筛选。     

论传统工笔画的审美意境

工笔画在画史中的尴尬处境,实乃文人画语境下的一元论所致。工笔画不等同于画工画,与画工画最大的区别在于画工画只描摹客体而无主体,而工笔画既有客体又有主体,在追求画外意境、诗性的同时,更注重画内的功夫,最求细节与意境、诗性的统一,故传统工笔画的审美,遵循着绘画性、社会性、文学性与精神性原则。     

基于STIRPAT模型的低碳经济策略分析——以辽宁省为例

随着社会经济的发展,大量温室气体的排放已引起严重的气候变化。辽宁省积极响应国家政策,发展低碳经济。采用1989～2009年辽宁省相关的统计数据,对STIRPAT模型进行了扩展分析,应用EViews6.0软件并使用时间序列分析方法,研究了辽宁省碳排放量的影响因素,并提出了相应的减排策略及建议。     

Application of surface plasmon resonance in screening adsorbents and explaining adsorption phenomena using model polymers

A surface plasmon resonance (SPR) technique was developed as an online screening method to identify effective adsorbents for the peptide NH₂-Cys-Thr-Trp-Trp-COOH (CW-4). To validate the SPR technique, several linear polymers containing amino acid residues were synthesized as models of their corresponding adsorbents. SPR screening of all the linear polymers demonstrated that the linear polymer containing phenylalanine residues (PPhe) exhibited the highest affinity for CW-4 among the polymers tested. In accordance with the screening results from SPR, the adsorbent containing phenylalanine (APhe) exhibited the highest adsorption capacity for CW-4. An interesting observation was that the amounts of CW-4 adsorbed on 3 adsorbents were quite small, even though both SPR and isothermal titration calorimetry (ITC) experiments indicated the presence of interactions between CW-4 and the three polymers. A kinetic analysis performed using SPR technology suggested such a phenomenon was ascribed to the poor stability of the CW-4/polymer complexes; that is, CW-4 associates with the polymers quickly, but it also dissociated quickly. The combined results suggested that SPR was a promising tool to identify the optimal adsorbent for peptides, analyze the interactions contributing to adsorption and explain adsorption phenomena using polymer models.     

GPS高程的神经网络转换方法

探讨了用神经网络方法转换GPS大地高为正高或正常高,给出了一种改进的BP神经网络拓扑结构和算法,并用GPS实测资料数据进行了计算分析,估算精度达到厘米级,且精度比较稳定,已知样本点的数量要求较少。