Relativistic mapping between NMR and NSR

We highlight three aspects of NMR(nuclear magnetic resonance)and NSR(nuclear spin-rotation):(1)Relativistic theory of NMR:The nonrelativistic theory of NMR was established in 1950 by Ramsey,butthe corresponding relativistic counterpart was long plagued by the’missing’diamagnetism.This was fully resolved only in 2007.(2)Relativistic theory of NSR:The nonrelativistic theory of NSR was also established in 1950 by Ramsey.     

钢筋混凝土箱梁受弯性能的比拟杆分析

基于截面换算的原理对现行分析箱梁受力性能的比拟杆法进行修正,得到考虑钢筋影响的比拟杆分析方法．通过三杆比拟和多杆比拟分析了混凝土箱梁在不同配筋情形下的弯曲应力,并用限元结果验证了修正的比拟杆法分析钢筋混凝土箱梁弯曲受力的适用性．结果表明：相同工况下比拟杆法和有限元法所得应力计算结果相近,且考虑钢筋影响后的计算结果与实测值更为接近,考虑钢筋影响才能反应实际应力状态;当板内钢筋均匀分布时,配筋率的变化基本不影响箱梁剪力滞大小．     

基于旋转变换矩阵和广义共轭剩余法的信号源数检测方法

确定空间信号源数目在高分辫率测向中起着至关重要的作用.提出了一个鲁棒的误检概率较低的检测信号源数目算法--旋转变换矩阵-广义共轭剩余法(VTRS-GCR),算法主要利用了旋转变换子阵方差(VTRS)的趋零性,同时使用广义共轭剩余法(GCR)来解矩阵方程得到旋转变换矩阵的估计值.算法适用于任何的子阵几何模型,同时不需要额外的参数和主观的门限设定.如果与空间平滑技术相结合,还可以用于检测相关信号.仿真结果表明,VTRS-GCR方法在较低的信噪比和较小的快拍数条件下都能表现良好的检测效果,同时还可用于色噪声背景和信号源数目较大的条件下.     

牵伸加捻机的改造

阐述了对目前国内化纤生产厂家使用的VC443A牵伸加捻机进行改造的必要性，介绍了改造部件(包括机械部件与电气部件)的重要结构特征。     

傅立叶红外光谱法用于茶叶品质的鉴定

为了实现茶叶品质的快速准确鉴别,以常用的4种茶叶（花茶、绿茶、普洱茶、乌龙茶）为研究对象,每种茶叶按特级、普通、低档3个档次各选一个实验样品,测定了它们的傅立叶红外光谱图．结果表明：同类茶叶在3000—2800cm^-1、1700—1500cm^-1、1500—1200cm^-1、1200—1000cm^-1,900--400cm^-1区域有固定的特征谱带,茶叶品质的差异导致这些特征谱带出现波数、强度、形状的明显差异,为茶叶品质的鉴别提供了较可靠的依据．     

Two phorbol ester receptor affinities in partially transformed human urothelial cells and decrease of receptor binding in desensitized cells

The presence of specific binding sites for phorbol esters was studied in a transformed but non-tumorigenic human urothelial cell line HCV-29 by assay of specific binding of³H-phorbol-12,13-dibutyrate (³H-PDBu) to intact living cells.³H-PDBu bound specifically to HCV-29 cells in a saturable and competitive manner. Scatchard plot analysis of specific binding yielded a curved plot consistent with two binding sites with K_d of 11 nM and 102 nM, respectively. At saturation the corresponding PDBu binding capacities (B_max) were 8.8 pmol/10⁶ cells (5.2×10⁶ molecules bound per cell) and 2.8 pmol/10⁶ cells (1.7×10⁶ molecules bound per cell).³H-PDBu binding was displaced by biologically active phorbol ester tumor promoters such as 12-O-tetradecanoylphorbol-13-acetate (TPA) and mezerein,but not by tumor promoters such as L-tryptophan, anthranilic acid and sodium saccharin. In cells desensitized by pretreatment with 1 g/ml (2M) TPA or PDBu for 24 h the level of binding was reduced to 28% of the level in non-exposed cells. The ability of desensitized cells to bind³H-PDBu was gradually restored within 5–6 days. At the same time the cells became sensitive to the morphological alteration induced by PDBu. This suggests that desensitization of HCV-29 cells is due to a decreased receptor-ligand binding capacity probably associated with down regulation of the phorbol ester receptors.     

浅谈高层建筑转换层施工的监理

根据转换层的结构特点,指出了应认真审查施工单位报送的施工组织设计和转换层专项施工方案,并根据审批的施工组织设计和转换层专项施工方案、设计文件、相关文献和技术标准实施监理。     

盐胁迫下转BADH基因水稻主要农艺性状及其与单株籽粒产量的相关分析

对转BADH基因水稻品系在0.0,3.0,5.0g/LNaCl胁迫下的抽穗期、株高、穗长、有效穗数、成穗率、总粒数、实粒数、结实率、千粒重、单株籽粒产量等10个农艺性状进行了相关分析。结果表明:在上述三种浓度NaCl胁迫下,有效穗数与单株籽粒产量之间的偏相关均达到极显著;在0.0,3.0g/LNaCl胁迫下,只有千粒重与单株籽粒产量之间的偏相关达到极显著;在3.0,5.0g/LNaCl胁迫下,只有实粒数与单株籽粒产量之间的偏相关达到极显著。在三种浓度NaCl胁迫下,有效穗数、实粒数对单株籽粒产量的直接效应较大,而千粒重的直接效应则较小。     

切削高强度结构钢形成的绝热剪切带微结构观察

使用扫描电子显微镜和透射电子显微镜对高强度结构钢30CrNi3MoV正交切削产生的切屑内绝热剪切带的微细组织进行了观察，测量了绝热剪切带的显微硬度。绝热剪切带中心和基体组织之间，组织是渐变的。绝热剪切带内硬度达到了淬火马氏体硬度，并具有细小的等轴晶组织，内部含有少量χ-Fe6C2和Fe3C碳化物与奥氏体。基体和剪切带之间的过渡区为大塑性变形的马氏体组织，分布有高密度的位错。研究结果表明，在实验切削条件下得到的绝热剪切带属于相变带。     

抗阿霉素中国仓鼠卵巢上皮细胞的细胞骨架变化

肿瘤细胞对多种结构不同、作用靶位不同的抗癌药物的抗药性,是导致化疗失败的主要原因,国外对多药抗性的机理进行了大量的研究工作,但很少有抗药性与细胞骨架关系的报道。我们实验室用已建立的抗阿霉素(ADR)的中国仓鼠卵巢上皮细胞(CHO)抗性模型(RC 1),运用荧光显微光度术,同时测定单细胞的DNA和聚合微管含量,DNA和F-微丝含量,发现RC 1聚合微管含量降低,F-微丝含量增加,并且都与敏感CHO细