利用X射线衍射仪评价防膨剂效果的实验方法

以水化膨胀能力最强的钠蒙脱石为研究对象,利用X′Pert Pro粉晶X射线衍射仪测试蒙脱石（001）晶面间距的原理,探索性地建立了使用X射线衍射仪直接、快速评价防膨剂防膨效果的方法和实验流程。系统总结了钠蒙脱石在去离子水、有机防膨剂、无机防膨剂中的（001）晶面间距变化情况。研究表明,蒙脱石（001）晶面间距的变化能够直观的反应防膨剂的防膨效果。并且采取了先抑后膨、先膨后抑的方法对防膨剂的稳定性、持续性进行了评价,拓宽了评价防膨剂的性能参数     

参数校正处理在扩展边界条件法中的应用

作者对扩展边界条件法 (EBCM )进行了参数校正处理 ,以拓宽扩展边界条件法的适用范围 .通过对亚波长正弦光栅进行数值计算 ,在光栅深宽比达 1.0 5的情况下 ,获得稳定收敛的结果 ,并与反射透射系数阵法 (RTCM )的计算结果一致 .     

合理确定光爆孔距问题的一种新方法

本文基于弹性理论,对光面爆破形成贯穿裂隙的机理进行了力学分析,以合理地确定炮孔间距.     

TRAF4 functions as an intermediate of GITR-induced NF-κB activation

Members of the tumor necrosis factor receptor (TNFR) family regulate the activation, differentiation, and function of many cell types, including cells of the immune system. TNFR-associated factors (TRAFs) function as adapter molecules controlling signaling pathways triggered by TNFR family members, such as activation of nuclear factor B (NF-B). Despite intensive research, the function of TRAF4 in signaling pathways triggered by TNFR-related proteins remains enigmatic. Intriguingly, our functional studies indicated that TRAF4 augments NF-B activation triggered by glucocorticoid-induced TNFR (GITR), a receptor expressed on T cells, B cells, and macrophages. Further analyses revealed that TRAF4-mediated NF-B activation downstream of GITR depends on a previously mapped TRAF-binding site in the cytoplasmic domain of the receptor and is inhibited by the cytoplasmic protein A20. GITR is thought to inhibit the suppressive function of regulatory T cells (T_reg cells) and to promote activation of T cells. Taken together, our studies provide the first indications that TRAF4 elaborates GITR signaling and suggest that TRAF4 can modulate the suppressive functions of T_reg cells.Received 20 September 2004; received after revision 8 October 2004; accepted 18 October 2004     

C_PCP与_w_w_CPCP的关系

本文证明了下面２个结果：（１）当Ｘ＊具有ＰＣＰ时，Ｃ＊ＰＣＰ与（ｗ＊－ｗ）ＣＰＣＰ等价；（２）Ｘ＊具有Ｃ＊ＰＣＰ当且仅当Ｘ＊具有（ｗ＊－ｗ）ＣＰＣＰ且对Ｘ＊的每个非空ｗ＊－紧凸子集Ｋ，（ｗ＊－ｗ）ＰＣ（Ｋ）含有Ｋ的一个ｗ＊－稠密Ｇ子集．     

Green tea epigallocatechin-3-gallate is an inhibitor of mammalian histidine decarboxylase

(–)-Epigallocatechin-3-gallate, an antiproliferative and antiangiogenic component of green tea, has been reported to inhibit dopa decarboxylase. In this report, we show that this compound also inhibits histidine decarboxylase, the enzymic activity responsible for histamine biosynthesis. This inhibition was proved by a double approach, activity measurements and UV-Vis spectra of enzyme-bound pyridoxal-5-phosphate. At 0.1mM (–)-epigallocatechin-3-gallate, histidine decarboxylase activity was inhibited by more than 60% and the typical spectrum of the internal aldimine form shifted to a stable major maximum at 345nm, suggesting that the compound causes a stable change in the structure of the holoenzyme. Since histamine release is one of the primary events in many inflammatory responses, a new potential application of (–)-epigallocatechin-3-gallate in prevention or treatment of inflammatory processes is suggested by these data.Received 8 April 2003; received after revision 20 May 2003; accepted 3 June 2003     

巷道掘进工作面炮眼数目的确定

本文讨论了在光面爆破情况下,炮眼数目应按周边与其它炮眼分别计算原则来计算,并给出了计算公式。     

表面粗糙度参数S,Sm实用测量法

文章提出了测量表面粗糙度评定参数S、S_m的几种实用方法和这些方法的应用范围。     

浅谈物理学史在物理教学中的作用

分析了物理学史的学习对提升大学生的科学素质方面的作用,总结了物理学史在提升大学生的学习兴趣、提高观察和分析问题能力、培养科学精神和科学方法等方面的作用。     

高强钢筋混凝土梁裂缝宽度的试验研究和分析

为了研究配置高强钢筋混凝土梁开裂后的使用性能,对14根配置500MPa钢筋的混凝土梁进行了受弯性能试验.给出了梁侧面裂缝宽度沿裂缝高度的分布规律;梁底面裂缝宽度沿梁宽变化规律;典型位置处平均裂缝宽度与弯矩关系等,并对裂缝宽度值进行了统计分析.由本次试验和其他相关试验的数据分析表明:在钢筋应力较高时产生的次生裂缝会明显抑制主裂缝的扩展速度;我国现行规范的裂缝宽度公式的计算值明显大于试验值,不适用于配置高强钢筋混凝土梁的情况.对钢筋高应力下的裂缝宽度主要影响因素进行了分析,并提出了配置高强钢筋混凝土梁裂缝宽度的2种计算模式.建议公式与试验结果吻合较好.