磺化聚芳醚酮酮催化合成乙酸丁酯

以交联的聚芳醚酮酮和φ=20%的发烟硫酸合成了磺化聚芳醚酮酮树脂,并用于乙酸丁酯的催化合成。最佳条件：酸醇摩尔比为1：1.6,催化剂用量（质量分数,ω）为4.35%,反应温度115-120℃,反应时间为4h,酯化率达87.5%,催化剂易回收且可重复使用。     

Progress and records in the study of endogenetic mineralization during collisional orogenesis

To develop and perfect the theory of plate tectonics and regional metallogeny, metallogenesis during collisional orogenesis should be thoroughly studied and will attract increasing attention of more and more scientists. This paper presents the main aspects of research and discussions on metallogenesis during collisional orogenesis after the development of plate tectonics, and accordingly divides the study history into two stages, i.e. the junior stage during 1971–1990 and the senior stage after 1990. Beginning with the negation of mineralization in the collision regime by Guild (1971), the focus of study was put on whether there occurred any mineralization during collisional orogenesis at the junior stage. At the senior stage, which is initiated by the advance of metallogenic and petrogenic model for collisional orogenesis, scientists begin to pay their attention to the geodynamic mechanism of metallogenesis, spatial and temporal distribution of ore deposits, ore-forming fluidization, relationship between petrogenesis and mineralization in collisional orogenesis, etc. Abundance of typical collisional orogens such as Himalayan, China has best natural conditions to study collisional metallogenesis. Great progress in the study of metallogenesis during collisional orogenesis has been made by Chinese geologists. Therefore, we hope that the’ Chinese geologists and Chinese governments at various levels to pay more attention to the study of collisional metallogenesis. Some urgent problems are suggested to be solved so as to bring about breakthroughs in the aspects concerned.     

一种远程的大流量网络流特征分析预处理模型

由于运营过程中的网络流特征分析往往不具备本地分析的条件,远程网络流特征分析成为现代网优工作的重要基础之一。显然,远程网络流特征分析势必增加网络开销,而大流量又是当前网络应用的普遍特征,如何实现网络流特征数据高效的远程采集是必须解决的关键问题之一。为此,提出了数据报文特征字段提取和组装的预处理模型,并设计了远程网络流特征量采集算法TPE,系列实验结果表明较好地解决了该问题,实现了高效的远程网络流特征提取与集中式分析。     

Heat-shock protein 60 translocates to the surface of apoptotic cells and differentiated megakaryocytes and stimulates phagocytosis

Heat-shock protein 60 (Hsp60) is a highly conserved stress protein which has chaperone functions in prokaryotes and mammalian cells. Hsp60 is associated with the mitochondria and the plasma membrane through phosphorylation by protein kinase A, and is incorporated into lipid membranes as a protein-folding chaperone. Its diverse intracellular chaperone functions include the secretion of proteins where it maintains the conformation of precursors and facilitates their translocation through the plasma membrane. We report here that Hsp60 is concentrated in apoptotic membrane blebs and translocates to the surface of cells undergoing apoptosis. Hsp60 is also enriched in platelets derived from terminally differentiated megakaryocytes and expressed at the surface of senescent platelets. Furthermore, the exposure of monocytic U937 cells to Hsp60 enhanced their phagocytic activity. Our results suggests that externalized Hsp60 in apoptotic cells and senescent platelets influences events subsequent to apoptosis, such as the clearance of apoptotic cells by phagocytes.     

金属有机铂（II）配合物在光限幅材料中的研究进展

随着激光技术不断发展并走向成熟,如何防止激光损伤已经成为亟待解决的科学问题。铂（II）配合物因其结构稳定、光物理性质丰富、化学修饰性及光谱可调性强,以及激发态寿命长等特点,在光限幅材料领域中被广泛应用。当前,开发限幅性能优异、光学窗口宽且透光性高的铂（II）配合物光限幅材料成为激光防护领域中的研究热点。重点介绍了近年来报道的各类铂（II）配合物的光物理性质调控和光限幅性能研究,并对该领域的发展趋势进行了展望,以期为开发新型铂（II）配合物光限幅材料提供一定的参考。     

Pancreatic islet β-cell deficit and glucose intolerance in rats with uninephrectomy

This study was performed to examine the effect of chronic renal impairment and renin-angiotensin system (RAS) activation induced by unilateral nephrectomy (UNX) on the development of pancreatic islet β-cell deficit and glucose intolerance. Sprague-Dawley rats were randomized into three groups: untreated UNX (n = 10), UNX treated with the angiotensin-converting enzyme inhibitor lisinopril (n = 8) and sham operation (n = 10). Blood glucose, serum insulin, renal function and histological changes of kidney and pancreas were examined 8 months postoperation. Compared with the sham rats, UNX rats developed renal impairment, insulin deficiency and glucose intolerance. Histological staining revealed an islet β-cell deficit associated with increased immunoreactivity for angiotensin and angiotensin type 1 receptor in UNX rats. Treatment with lisinopril significantly improved renal dysfunction, hyperglycemia, insulin secretion and islet RAS expression. These data suggest that chronic renal impairment and RAS activation may contribute to islet β-cell loss and glucose intolerance. RAS blockade may therefore prevent these disorders. Received 29 August 2007; received after revision 25 September 2007; accepted 27 September 2007     

基于拉拔试验的GFRP筋与砂浆粘结性能研究

为了获得玻璃纤维筋与砂浆间的合理粘结性能参数,本文采用室内拉拔试验和数值模拟反演分析相结合的手段开展了相关研究.通过开展不同筋材直径与不同砂浆强度下的筋材拉拔试验,得到了不同工况下的粘结强度-滑移量曲线,探明了筋材直径与砂浆强度对GFRP筋粘结强度的影响规律.基于室内拉拔试验结果,采用有限差分软件FLAC~(3D)模拟再现了GFRP筋拉拔试验,对软件中的粘结性能参数进行了反演分析,修正得到了GFRP筋灌浆体刚度和黏聚强度的计算公式.研究结果表明:GFRP筋与砂浆间的粘结强度与筋材直径成负相关,与砂浆强度成正相关;在缺乏筋材拉拔试验数据时,纤维筋锚杆极限粘结强度宜取灌浆体抗压强度的五分之一,以求得灌浆体黏聚强度;纤维筋锚杆灌浆体刚度可采用普通钢筋锚杆灌浆体刚度计算公式获取,但应乘以位于(1/10, 1/15]区间内的折减系数.     

不同林龄杉木径向变化及其对气象因子的响应

[目的]研究树木的生长机制能够为树木年轮学以及重建高分辨率环境演变历史提供重要途径和基础,在高分辨率的基础上分析不同林龄树木径向生长对气候的响应特征,能更好地规划被监测树种在不同林龄的生存策略.[方法]利用带状树干径向测量仪于2017年7月-2018年7月对福建省将乐国有林场不同林龄的杉木(Cunninghamia l...     

高温环境下含典型凹坑缺陷蜂窝夹芯板特征值屈曲性能

蜂窝夹芯板在运输、使用过程中,可能在面板上产生形式各异的凹坑,研究高温环境下含凹坑缺陷蜂窝夹芯板的屈曲性能对评估结构安全和可重复使用具有重要意义。基于Python语言构建了含圆形凹坑缺陷、含正方形凹坑缺陷、含正三角形凹坑缺陷蜂窝夹芯板参数化有限元模型,分析了恒温和变温下凹坑缺陷关键参数对蜂窝夹芯板特征值屈曲性能影响规律,结果表明不管是恒温环境还是变温环境,随着凹坑缺陷直径(边长)或者凹坑深度的增大,蜂窝夹芯板临界失稳载荷降低;对比分析了等面积缺陷和等周长缺陷下三种典型缺陷对结构特征值屈曲性能的影响,结果表明等面积缺陷下,含圆形凹坑缺陷蜂窝夹芯板的临界失稳载荷略大于其余两者,等周长缺陷下,含正三角形凹坑缺陷蜂窝夹芯板的临界失稳载荷略大于其余两者。