AutoCAD R13 for Windows外挂式汉字方法

利用现成的矢量汉字库，在ＡｕｔｏＣＡＤＲ１３ｆｏｒＷｉｎｄｏｗｓ中进行汉字标注．此方法不需要专用的ＡｕｔｏＣＡＤ汉化环境，完全保持其原有特性，简单实用，能够满足一般应用的需求     

Central IL-1 differentially regulates peripheral IL-6 and TNF synthesis

Centrally given interleukin (IL)-1 is known to induce a rapid rises in blood IL-6. To extend this and to examine the mechanism by which this occurs, the effects of intracerebroventricular (icv) injection of human recombinant IL-1β on mRNA expression of IL-6 and tumour necrosis factor (TNF) in the spleen and liver were examined in rats. Icv injection of IL-1 produced a rapid rise of the tissue mRNA levels of IL-6 and TNF in both organs, prior to and/or in parallel with an increase in their serum levels. Pretreatment with chlorisondamine, a ganglionic blocking agent, inhibited the IL-6 responses, while it had little influence on the TNF responses. The results suggest that brain IL-1 induces peripheral production of IL-6, but not of TNF, through autonomic nervous system activation. Received 27 October 1997; received after revision 15 December 1997; accepted 12 January 1998     

过渡金属离子与氨基酸形成配合物的NMR研究

氨基酸是生命系统中蛋白质的基本结构单位,生物分子中的氨基酸是金属离子重要的配位体之一。我们测定了甘氨酸、精氨酸等六种氨基酸与金属离子Zn~(2+),Cd~(2+),Hg~(2+)的~1H和~(13)C NMR谱,从而探讨它们的配位机理。实验结果表明,在加入过渡金属离子前后,氨基酸的~1H和~(13)C谱的化学位移位发生了一定的变化,据此可揭示过渡金属离子和氨基酸形成配合物的配位点,进而可研究所形成配合物的结构及其成键规律。     

Effect of total aluminum concentration on the formation and transformation of nanosized Al13 and Al30 in hydrolytic polymeric aluminum aqueous solutions

Influence of total aluminum concentration （CAIT） on the generation and transformation of nanosized AI13 and AI30 in hydrolytic polyaluminum aqueous solutions was investigated using high field 27AI NMR and time-developed AI-Ferron complex colorimetry. When prepared at the optimal basicity （B） of Al13 generation and 80℃, the All3 species in polyaluminum solution tends to further polymerize and convert to AI30 and higher polymers when CAI; 〉0.2 mol· L^-1, but Al13 does not convert to AI30 quantificationally, as the formation of Alu from Al13 and AI30 is accelerated in the same way. The conversion rate of All3 is accelerated by the increase in CAIT. When CAlT 〉0.75 mol·.L^-1, Al13 content decreases rapidly, and AI30 content increases continuously and becomes the dominant nanometer polynuclear aluminum species. AIm is one of prerequisites of Al13 conversion to AI30. When CAI; increases and B reduces, the polymerization rate between Al13 and Aim increases, and at the same time, the dissociation reaction rate of All3 and AI30 by H^＋ also increases. The latter becomes the dominant reaction in polyaluminum solution with low B value, so AI30 decreases with the increasing CAlT. The hydrolytic polyaluminum solution with Al13 content beyond 80% can only be prepared under the condition of CAlT〈0.5 mol· L^-1 and optimal B value.     

高纯度金雀花碱的提取方法研究

探索从披针叶黄华种粒中提取并纯化金雀花碱的实验室新方法，采用实验室常用的简便操作方法。而不是传统的色谱分离法。得到高纯度的金雀花碱，测定了其核磁共振碳谱和氢谱，并验证了其成分、结构及纯度。     

脲醛树脂化学结构及反应的13C-NMR研究

通过13C-NMR可以很好地解析采用传统工艺(碱—酸—碱工艺)合成脲醛树脂反应过程中的结构变化,并可推测可能发生的反应。研究表明:碱性条件下,甲醛与尿素的反应以加成反应为主,反应生成大量的一羟甲脲,尿素全部参与反应,甲醛此时以聚合状态存在,同时伴有缩聚反应的发生;酸性反应阶段以缩聚反应为主,形成以亚甲基键或醚键联接大分子体系,聚合状态的甲醛已全部分解,并以甲二醇的形式参与缩聚反应;第3次尿素的加入可以明显地降低反应体系中的游离甲醛含量,同时主要生成为一羟甲脲。     

十三世达赖喇嘛新政改革失败原因探

十三世达赖喇嘛基于两度逃亡期间对国际政治的风云变幻和外部社会在政治制度、经济建设、科学文化等方面成就的认识,采取一系列措施对西藏传统的政教制度进行了较为全面的革新,并取得了一定的成绩,使西藏社会开始出现一些顺应时代发展的新鲜事物。但是,由于新政推行者本身的局限性和西藏社会的传统惰性等各种内外原因,十三世达赖喇嘛旨在求强图变的新政改革运动,终究没能在西藏社会全面展开而中途夭折。文章试对其中的原由作些初步的分析和探讨。     

Induction of lymphokine-activated killer cells from nude mouse spleen cells by interleukin-4

The induction of lymphokine-activated killer (LAK) cells from natural killer (NK) lineage cells by interleukin-4 (IL-4) was studied in vitro. Activation of nude mouse spleen cells by IL-4 generated cytotoxic cells, capable of killing NK-sensitive as well as NK-resistant tumor cells. The induction of peak lytic activity was demonstrated after 3 days of culture with IL-4. Surface marker analysis indicated that the majority of precursor cells were aGM1⁺, Thy1^–, and the majority of effector cells were aGM1⁺, Thy1⁺, suggesting that IL-4 induced LAK cells from nude mouse spleen cells were similar to those from normal mouse spleen cells. The induction of nude mouse LAK cells by IL-4 was partially inhibited by anti-IL-4 or anti-interferon (IFN)-, antibody, and it was further inhibited by the combination of two antibodies, suggesting that IFN-, production was associated with LAK induction of NK lineage cells by IL-4.     

H13钢热挤压模具自保护膏剂稀土硼碳氮共渗的应用研究

H13钢自保护膏剂稀土硼碳氮共渗的工艺研究以及H13钢热挤压模具的工业应用试验研究解决了固体硼碳氮共渗需要装箱密封、渗剂使用量大、渗剂难以清理干净以及影响淬火组织、硬度均匀性等问题,模具热处理成本下降40%.