废氨水喷淋予脱硫

在小氮肥企业中,保护和使用好变换触媒,合成触媒和醋酸铜氨液是保证正常生产的一个重要的环节。而两个触媒一个铜液使使用的好坏,与系统气体中H_2S的含量有密切关系。我厂所用的原料煤主要是山西阳泉块煤。其含硫量高,焦油含量也较多。这就给气体净化造成了困难。我厂投产以来变换触媒经常只能使用八、九个月;铜洗工段的带液,冒液事故经常发生,合成工段一年更换二、三次触媒。致使生产不稳定,产量低消耗高。为了征服生产大敌H_2S和焦油等,我们利用78年大修的机会在气柜出口搞了废氨水喷淋予脱硫。通过几年的生产实践证明,     

我所体验的“企业家”

我所体验的“企业家”齐中兴（朝阳重型机器厂）什么是现代企业家？各种经济论著自有理论定义。就从事企业经营管理的几年实践，我的体验是，企业家应当是‘战略家、冒险家、专家、政治家”的综合体，应当是立体式的高级人才。企业家应当是一位“战略家”。企业不仅仅是获...     

大化肥厂循环冷却水微生物的监测与控制工作(附表)

表1:1980年各厂异养菌检测数据统计表(个/毫升)厂名‘一,川化 }取样·…};:… {:算:柔)… 原水 补充水 循环出水 循环回水 …:::::::…i了:……… … 11次/月2一3次/周2~3尸(二)齐普1次/周该{困讼恤…>2:…:…::…;::…:::…:……::::………13:::……1次/周1 .IX 1040。ZX 10617006。IX 104l。32X 106490045X 1041。57X 10619024。3减 10‘(三)沪天化6。4X 10419。ZX 10‘5。37减 1042次/周(四)江河0X 10439002。7X 10434001。4X 1042,.2丝‘ 10,1。SX 10411 1 277042319。3X 104心802。SX 10‘…l!…川!|2020||﹄以|﹄比尸||l一|(…     

CpG-ODN对乙肝核酸疫苗及重组疫苗免疫效果的影响

目的研究CpG寡聚脱氧核苷酸(CpGODN)对乙肝核酸疫苗及重组(CHO细胞)疫苗免疫效果的影响。方法核酸疫苗实验组用CpGODN与乙肝核酸疫苗联合免疫BALBc小鼠,阳性对照组注射核酸疫苗,阴性对照组注射质粒pVAX1;重组疫苗分4个实验组,用CpGODN与不同剂量的重组疫苗配伍后分别免疫BALBc小鼠,阳性对照组注射重组疫苗,阴性对照组注射生理盐水。应用ELISA检测小鼠血清中的抗HBs水平。结果CpG与乙肝核酸疫苗组抗体阳转率比阳性对照组提高3倍,抗体水平提高2倍。CpG与重组疫苗组的阳转率和阳转时间均高于或早于CpG与核酸疫苗实验组。加入CpGODN后,即使重组疫苗用量减少3倍,诱导抗体水平和阳转率均无明显改变。结论CpGODN可提高乙肝核酸疫苗和重组疫苗的免疫效果,并使抗体产生的时间提前。     

海军航空兵机动转场辅助决策系统设计与实现

针对海军航空兵部队实施机动转场时需要完成的选择转场飞机、确定物资携行量、物资装载和调配运输资源这四个关键决策任务,在充分需求分析的基础上,讨论了模型构建规则和系统功能要求,提出了辅助决策系统的设计方案,并利用面向服务的体系结构和Web Service开发技术,给出了系统实现方法.应用结果表明该系统具有先进的技术体系,稳定可靠的运行结果,为科学生成机动转场预案提供了新途径,从而提高飞行团机动转场决策能力.     

Interaction of CETP inhibitory peptide and lipoprotein substrates in cholesteryl ester transfer assay: relationship between association properties and inhibitory activities

In a previous study, CETP inhibitory peptide (3 kDa) was isolated from hog plasma. The peptide, synthesized chemically according to the amino acid sequence of the 3-kDa peptide (designated P₂₈), showed CETP inhibitory activity both in vitro and in vivo [Cho et al. (1998) Biochim. Biophys. Acta 1391, 133–144]. We report herein further unique features of P₂₈ when it was associated with the cholesteryl ester (CE)-donor and-acceptor lipoproteins. Lipoprotein substrates with P₂₈ present in both HDL (as a CE-donor) and LDL (as a CE-acceptor) served as poor substrates, with CE-transfer activity decreased up to 60% compared to normal substrates without P₂₈. P₂₈ was found to be located in HDL fractions of hog plasma and showed the same electromobility as that visualized by PAGE on 7% polyacrylamide gel under nondenaturing conditions. Addition of apolipoprotein A-1 (apoA-1) or apoB antibody to a normal CE-transfer mixture did not alter CE-transfer activity. However, addition of apoA-1 or −B antibody to a CETP-inhibition mixture decreased the inhibitory activity of P₂₈ by ca. 20%. Western blot analysis revealed that P₂₈ was associated only with human and hog HDL among several lipoproteins purified from human, hog, and rabbit. CFTP-inhibition assays with various lipoprotein substrates revealed that P₂₈ exhibited substrate-specific inhibitory activity. The inhibitory activity of P₂₈ was highly dependent on the type of lipoprotein substrate (whether CE-donor or-acceptor); P₂₈ inhibited CE transfer from HDL to LDL, but it did not inhibit CE transfer from HDL to HDL.     

Synthesis of novel tri- and tetrasubstituted C<Subscript>18</Subscript> furan fatty esters

A methylene-interrupted C₁₈ keto-acetylenic fatty ester (methyl 12-oxo-9-octadecynoate) was obtained from methyl ricinoleate by bromination-dehydrobromination followed by oxidation. Reaction of methyl 12-oxo-9-octadecynoate with bis(benzonitrile) palladium(II) chloride, allyl bromide, or methyl-allyl bromide furnished methyl 8-[5-hexyl-3-allyl-furan-2-yl]-octanoate (1, 56%) or methyl 8-[5-hexyl-3-(2-methyl-allyl)-furan-2-yl]-octanoate (2, 55%). Reaction of methyl 12-oxo-11-chloro-or 11-fluoro-9-octadeyynoate (prepared from methyl santalbate-methyl 11-E-9-octadecynoate, found in sandalwood, Santalum album, seed oil) with bis(benzonitrile) palladium(II) chloride gave methyl 8-(4-fluoro-5-hexyl-furan-2-yl)-octanoate (3, 50%) or methyl 8-(4-fluoro-5-hexyl-furan-2-yl)-octanoate (4, 50%), respectively. And when methyl 12-oxo-11-chloro- or 11-fluoro-9-octadecynoate was treated with a mixture of bis(benzonitrile) palladium(II) chloride, allyl bromide, or methyl-allyl bromide, the reaction yielded tetrasubstituted C₁₈ furan derivatives, viz, methyl 8-(3-allyl-4-chloro-5-hexyl-furan-2-yl)-octanoate (5, 54%), methyl 8-[4-chloro-5-hexyl-3-(2-methyl-allyl)-furan-2-yl)-octanoate (6, 54%), methyl 8-(3-allyl-4-fluoro-5-hexyl-furan-2-yl]-octanoate (7, 10%), and methyl 8-[4-fluoro-5-hexyl-3-(2-methyl-allyl)-furan-2-yl]-octanoate (8, 10%). The presence of a fluorine atom in the furan derivatives 4, 7, and 8 was readily characterized by the appearance of doublets for carbon nuclei, which were coupled to the fluorine atom in the ¹³C NMR spectra. All furan fatty derivatives from this work were characterized by NMR spectroscopic and mass spectrometric analyses. The yields of compounds 7 and 8 were very low (10%) despite attempts to improve the procedure by increasing the amounts of the reactants and catalyst.     

大跨双曲混凝土组合扭壳屋盖施工拆模优化分析

由于混凝土抗拉能力较差,双曲组合扭壳抵抗悬垂线方向的主拉应力控制至关重要.如果拆模顺序不当,可能会使壳体结构产生过大的拉应力.为解决此问题,以华工扭壳为例,对平行四边形底面双曲组合扭壳的满堂脚手架施工拆模顺序进行全面优化分析,并与工程实测进行对比,得出较为合理的拆模方式.     

嵌入式系统电磁兼容性综述

本文根据目前的发展情况,总结了嵌入式系统电磁干扰的来源、传播途径以及一些解决电磁兼容问题的方法技巧,并进一步分析了目前嵌入式系统电磁兼容领域的难点。对比国内外研究情况,提出了必须发展嵌入武系统电磁兼容的计算机辅助分析和建立嵌入式系统电磁兼容性产业化的设想。