资产重组

本文通过对一家中型国有企业以下简称A公司的生产经营 管理状况的实地考察以期找到资不抵债国有企业摆脱困境的几种 可能的途径本文分析A公司的过去现在和未来认为由于历 史和现实内部和外部主观和客观等诸多原因致使A公司的生 产经营处于不断萎缩状态发展步履艰难已陷入资不抵债亏损 累累的严重困境之中A公司若要彻底走出困境获得新生最佳 的选择就是实施资产重组文章共分三个部分 第一部分通过实地考察从三个方面分析A公司目前的生产 经营状况和公司所处的聚酯纤维行业状况首先介绍公司的基本情 况引进的各种生产线情况及其在国内所处的位置然后通过企业 适度负债的经济学分析和偿债能力分析认为A公司已陷入...学位：工商管理硕士院系专业：管理学院工商管理教育中心_工商管理硕士(MBA)学号：X199815037

两阶段变刚度桩筏基础承载力可靠度分析及其在高层建筑基础的应用

通过建立承载力计算的极限状态方程,结合工程实例,运用可靠度理论,对两阶段变刚度桩筏基础的承载力进行了可靠度分析与验证,对其安全系数指标和可靠度指标的关系进行了研究分析,得到了基于概率极限状态设计方法即现行规范《建筑结构可靠度设计统一标准》的可靠度指标,验证了采用安全系数法作为两阶段变刚度桩筏基础承载力验(计)算方法的合理性

建党九十五周年与理工类研究生党建工作探析

中国共产党自1921年成立以来,已经有了95年的光辉历史,党的建设也随着时代的进步而不断得到加强。随着研究生入学人数的提高,高校理工类研究生党建工作成为高校学生党建工作中的重要组成部分。九零后一代逐步成为研究生群体重要组成部分,当前高校研究生党建工作将面临着许多新问题、新挑战。该文以纪念建党九十五周年为契机,结合其历史意义,紧扣当前中央指示精神,分析问题并找出解决对策,在加强新生代学生党员自身建设、发挥其主体作用和新媒体党建途径等方面进行探索。该文为厦门大学2015年度党支部工作立项活动校级立项项目研究成果

Effects of Benzoapyrene Exposure on Hepatic GST Activity in Black Porgy(Sparus macrocephalus)and Variation Relationships with Hepatic Metabolic Enzymes and Biliary Metabolites

为探讨苯并[A]芘(b[A]P)暴露对鱼类的影响并筛选特异、敏感的生物标志物,研究了b[A]P对黑鲷(SPAruS MACrOCEPHAluS)肝脏谷胱甘肽-S-转移酶(gST)活性的影响,并分析了肝脏7-乙氧基异吩唑酮-脱乙基酶(ErOd)、gST活性与胆汁中b[A]P典型代谢产物3-羟基-苯并[A]芘(3-OHb[A]P)3者之间及与b[A]P之间的剂量、时间-效应关系.结果显示:在b[A]P(0.5、1.0、2.0和5.0μg·l-1)暴露期间,肝脏gST活性随暴露时间总体呈“钟“形的变化趋势,在第2d时达到峰值;在第12H、1d和2d时,gST活性与b[A]P暴露浓度呈显著正相关(r12H=0.966(P<0.05)、r1d=0.953(P<0.05)、r2d=0.824(P<0.05)).与前期研究结果对比分析发现,b[A]P(0.5、1.0、2.0和5.0μg·l-1)暴露7d时,胆汁中3-OHb[A]P浓度与b[A]P暴露浓度呈显著的剂量-效应关系(r=0.943,P<0.05);黑鲷肝脏gST、ErOd活性与3-OHb[A]P的对数浓度均呈显著正相关(rgST=0.740(P<0.05)、rErOd=0.839(P<0.05));2.0μg·l-1b[A]P暴露后,黑鲷肝脏ErOd、gST活性与3-OHb[A]P随暴露时间的变化趋势基本相同,但并不完全一致.鱼类肝脏ErOd、gST与胆汁中b[A]P代谢产物3者之间的变化关系较为复杂,暴露浓度和时间是影响其变化的重要因素,肝脏gST和ErOd活性比胆汁中代谢产物更易受其影响,在b[A]P的环境监测中代谢产物可能是一种更为可行的生物标志物.Effects of benzoapyrene(BaP)exposure on the activity of glutathione S -transferase(GST)in black porgy (Sparus macrocephalus)liver was studied.The dose and time response of two enzymes (7-ethoxyresorufin O -deethylase (EROD) and GST)involved in BaP metabolism and the amounts of BaP metabolites excreted into the bile were investigated.Results showed that the time -response trend on of induction of hepatic GST of black porgy was bell -shaped with a plateau at BaP exposure for 2 days.A significant dose-related increase of the GST activity in liver was observed at the exposure time of 12h, 1d and 2d (R12h=0.966, p<0.05; R1d=0.9529, p<0.05; R2d=0.824, p<0.05).Compared with our former study, the induction of hepatic EROD, GST activities and biliary 3-OH BaP of black porgy were significantly induced by BaP (0.5, 1.0, 2.0 and 5.0μg·L-1)after exposure for 7 days and a significant dose -response relationship between 3-OH BaP and BaP was observed(R=0.943, p<0.05).After exposed to 2.0μg·L-1 BaP, similar variation trends of hepatic EROD, GST activities and biliary 3-OH BaP had been observed in black porgy, but those variations were not consistency with the time change completely.Those results demonstrated that the variation between hepatic metabolic enzymes and biliary metabolites were very complex.The exposure concentrations and exposure time were the most important factors which influence the variations of metabolic enzymes and metabolites.国家“863”项目(No.2007AA09Z126);国家自然科学基金项目(No.40106012;40476048;20777060);海洋公益性行业科研专项经费(No.200805090);国家海洋局青年基金(No.2008613);国家海洋局近岸海域生态环境重点实验室基金(No.200712

C–X(X = Cl, Br, I) bond dissociation energy as a descriptor for the redispersion of sintered Au/AC catalysts

负载型Au基催化剂在工业过程中具有非常广泛的潜在应用,如催化加氢/脱氢过程、精细化学品合成、能源催化转化及环境保护等过程,表现出很高的催化活性和选择性.Au基催化剂活性物种或活性中心基本由纳米粒子或化合物构成,但在应用过程中因Ostwald熟化效应或粒子迁移作用,尤其是高温高压等苛刻反应条件下,均随应用时间延长从小尺寸粒子逐渐长为大粒子,造成活性降低或完全失活,这也是负载型催化剂失活的最主要原因之一.其中因成本、稀缺等特性,负载型Au催化剂的烧结问题是影响和制约其应用的主要因素.除可通过载体改性、助剂和官能团配位稳定等方法来延缓其失活过程外,对已烧结催化剂的高效、快捷和绿色的再分散/再生过程也具有基础和应用研究的重要意义.活性炭载Au催化剂(Au/AC)广泛应用于乙炔氢氯化反应中,以期替代高毒性的汞基催化剂,但在反应过程中因高活性的Au~(3+)物种易被还原而形成Au~0物种进而烧结导致失活;如新鲜Au/AC催化剂表面的Au粒子尺寸为1-2 nm,经乙炔氢氯化反应后变为33 nm左右;随之在453 K、0.1 MPa、乙炔体积空速(GHSV)为600 h~(-1)、氯化氢与乙炔摩尔比为1.1的反应条件下,乙炔转化率从81.8%降至11.2%.如何有效对大粒子Au再分散/再生可为其应用提供有力支撑.有研究表明,气相CHI_3在甲醇羰基化反应过程中明显改变Au/AC表面的Au粒子尺寸;或采用浓盐酸或王水也可将烧结的Au/AC催化剂进行再分散/再生.但已有的Au基催化剂再分散/再生过程均伴随着强酸、强氧化或高毒性在分散剂的应用,对环境的影响及后续处理有明显的局限性,且再分散机理尚不明确.在前期工作基础上,本文采用系列卤代烃(碘代烃、溴代烃和氯代烃)对烧结的Au/AC进行再分散/再生研究.结果表明,在室温常压条件下CHI_3可以快捷高效地对烧结Au/AC催化剂进行再分散/再生,具有最优的再分散性能;通过对系列碘代烃C-I键的解离能分析,发现C-I解离能越低越有利于大粒子Au的再分散.同时,溴代烃和氯代烃对烧结的Au/AC催化剂也具有再分散能力,但比碘代烃的再分散效率低.C-X键的解离能与再分散效率有高相关性,即C-X键的解离能越低越有利于Au的再分散.总体上,三类卤代烃再分散效率高低顺序为C-I>C-Br>C-Cl.进而,通过不同分散过程中Au粒子分散状态推测了卤代烃对Au粒子的再分散机理,即卤代烃先在Au粒子表面化学吸附,然后C-X键解离,形成Au-X物种,小粒子Au在AC表面聚集并稳定,最后形成高分散Au粒子(粒径<1 nm)催化剂.以乙炔氢氯化反应考察了再生Au/AC催化剂性能,结果表明,该催化剂上乙炔转化率可达79.4%,基本恢复至初始水平,且该方法可对失活催化剂进行多次高效再生.Disintegration or redispersion of supported sintered gold nanoparticles(Au NPs) in the presence of alkyl halide can give catalyst regeneration or redispersion of sintered Au catalysts. The selectivity of alkyl halides, temperature and size distributions were investigated to elucidate the redispersion of Au NPs during halide-induced decomposition. This study proved that the alkyl halide induced the redispersion of sintered Au NPs which depended on the R–X(X = I, Br, Cl) bond dissociation energy(BDE) and thus provided a simple descriptor for the regeneration of inactive supported Au cata-lysts. A correlation between the BDE of R–X and dispersion efficiency was established. The tendency for disintegration and redispersion followed the R–X BDE of the alkyl halide. Compared to alkyl chlorides and bromides, iodides were more efficient for redispersing sintered Au NPs. As a descriptor, the BDE of R–I played a crucial role in particle redispersion. These findings provided insights into the mechanism of organic halide-induced Au NP disintegration and the effect of the halide type on the redispersion of sintered catalysts.国家自然科学基金(21403178,21473145,21503173,91545115);; 教育部创新团队发展计划(IRT_14R31);; 福建省青年教师教学科研基金(JA15003

海藻酸钠为主体胶黏合骨碎块的体外实验

背景:粉碎性骨折比较理想的治疗方式是应用胶黏剂直接黏合骨碎块,医用黏合剂在临床上已广泛应用。但利用植物中提取的生物胶用于骨折块的固定治疗目前未见报道。目的:采用海藻酸钠胶为主体材料,改性后加入增黏剂、固化剂进行固定骨折块的体外实验,并观察其黏结效果。方法:取市售新鲜猪股骨皮质骨标本,制备成大小约2cm2的骨片。以海藻酸钠为主体胶,分别与羧甲基纤维素钠和瓜儿胶按适当比例混和,用其黏合猪股骨断面面积为1cm2左右大小的皮质骨块,然后用氯化钙溶液固化,分别测试实验当天和浸泡于生理盐水1,2,3周后骨块的剪切应力。结果与结论:两种混合胶的黏合力随着时间的推移呈正态分布曲线,在1周后达到最高峰,剪应力达到17000σ/Pa,之后逐渐下降,黏剂完全有能力粘固断面面积1cm2左右大小的骨块。提示海藻酸钠改性后加入适当增黏剂,可以起到固定小骨块的作用

Application of biomarkers in marine environment monitoring

总结了国内外近十几年可应用于海洋环境污染监测常见的生物标记物及其主要的检测方法,对各自的应用特点进行了阐述,并展望了其应用的前景。其中对DNA损伤的检测作了较为详细的介绍。This paper sums up the recent-year application of biomarkers in marine environment motoring and the main detection methods of them.The features and the future prospects of these biomarkers are also discussed. The introduction of the DNA damage is the most detailed part in this paper.国家自然科学基金资助项目(A20077023,C40106012

Mirror Symmetry Breaking of cis-[Ni(NCS)_2tren]: Special Chiral Conformations of Chelate Rings

为了探究CIS-[nI(nCS)2TrEn][TrEn:三(2-氨基乙基)胺]的手性来源,本文采用单晶X射线衍射、溶液紫外-可见-近红外(uV-VIS-nIr)光谱、固体紫外圆二色(Cd)光谱和粉末X射线衍射(Xrd)等对CIS-[nI(nCS)2TrEn]的一对手性晶体进行了表征.研究结果表明:该手性晶体由结晶过程中的镜面对称性破缺而形成;三角架型配体TrEn配位后的特殊手性构象(δδλ,λλδ)是CIS-[nI(nCS)2TrEn]的主要手性来源.络合物固体紫外Cd谱所呈现的COTTOn效应可能来自其螯环手性构象以及手性金属中心对nCS-配体的π-π*跃迁和荷移跃迁生色团的手性微扰.对20批次合成产物进行固体Cd检测的统计结果表明:它们的对映体过量(EE)值在39%-100%之间.In order to explore the chiral origin of cis-[Ni(NCS)2tren] [tren: tris(2-aminoethyl) amine], a pair of chiral crystals of cis-[Ni(NCS)2tren] was characterized by X-ray single crystal structural analysis, solution UV-Vis-near infrared (NIR) spectroscopy, solid state UV-circular dichiroism (CD), and powder X-ray diffraction (XRD) spectra.The results indicated that the chiral crystals of cis-[Ni(NCS)2tren] were obtained by mirror symmetry-breaking crystallization, and the special chiral ring conformations (δδλ, λλδ) of the coordinated tripod-type tren ligands are responsible for the chiral origin of cis-[Ni(NCS)2tren].The Cotton effects of Ni(II) complexes in the solid-state UV-CD spectra are presumably attributed to the π-π* and charge-transfer chromophores of the NCS- ligands by the chiral perturbation of the helical ring conformations and metal-centered chirality.According to the statistical results of solid-state CD spectra of cis-[Ni(NCS)2tren] for twenty batch syntheses, their enantiomeric excess (ee) values are between 39% and 100%.国家自然科学基金(20773098;20973136)资助项目---

cis-[Ni(NCS)_2tren]的镜面对称性破缺: 螯环的特殊手性构象

为了探究cis-[Ni(NCS)2tren][tren:三(2-氨基乙基)胺]的手性来源,本文采用单晶X射线衍射、溶液紫外-可见-近红外(UV-Vis-NIR)光谱、固体紫外圆二色(CD)光谱和粉末X射线衍射(XRD)等对cis-[Ni(NCS)2tren]的一对手性晶体进行了表征.研究结果表明:该手性晶体由结晶过程中的镜面对称性破缺而形成;三角架型配体tren配位后的特殊手性构象(δδλ,λλδ)是cis-[Ni(NCS)2tren]的主要手性来源.络合物固体紫外CD谱所呈现的Cotton效应可能来自其螯环手性构象以及手性金属中心对NCS-配体的π-π*跃迁和荷移跃迁生色团的手性微扰.对20批次合成产物进行固体CD检测的统计结果表明:它们的对映体过量(ee)值在39%-100%之间

闽江口水、间隙水和沉积物中有机氯农药的含量

[摘要]：利用GC2ECD 和GC2MSD 对1999 年11 月闽江口水、间隙水和沉积物中的有机氯农药进行了研究. 结果显 示,闽江口水中有机氯农药的含量范围是01532～1182μg/ L ,间隙水中有机氯农药的含量为4154～1317μg/ L ,沉 积物(干重,以下讨论到的沉积物,无特别说明都是干重表示) :28179～52107μg/ kg ;与其他河口如珠江口、九龙江 口相比,闽江口的污染水平居中. 间隙水的污染物浓度普遍高于其上覆水的浓度,而沉积物中的浓度大于间隙水、 表层水,是由于有机污染物在水体中倾向于吸附在沉积物颗粒,并且通过再悬浮从底层向上迁移. 对水体中有机 氯农药各组分的含量及特征进行了分析,发现有机氯农药的主成分为:β2HCH ,DDE ,Heptachlor (七氯) ,Endosulfan Ⅱ(硫丹) ,Methoxychlor (甲氧滴涕) . DDE、β2HCH、Endosulfan Ⅱ分别占DDTs、HCHs 和硫丹的主要部分;有机氯 农药各组分间有正相关性,表明其河口有机氯农药陆源的土壤输入与相似的环境行为;对该河口的污染水平进行 了初步的评价,HCHs 符合国家海水水质一级标准,DDTs 则超过该标准.[Abstract]:The concentrations of 18 organochlorine pesticedes in water , pore water and surface sediment from Minjiang River Estuary were analyzed by GC2ECD , and confirmed by GC2MSD. The range of organochlorine pesticides was 01532～1182μg/ L at water , 4154～1317μg/ L at pore water , and 28179～52107μg/ kg at sediment . Compared with the results of other estuaries and gulfs (Pearl River Estuary , Jiulong River Estuary and so on) , it showed that the pollu2 tion of organochlorines in Minjiang was some moderate. The concentration difference in surface water , middle water , bottom water , pore water and sediment , due to the higher affinity of these hydrophobic compound for sedimentary phase than to water and a potential flux of pollutants from sediment to overlying water. The predominance ofβ2HCH ,DDE , Heptachlor , Endosulfan Ⅱand Methoxychlor in all water , pore water and sediment were clearly observed. On average , DDE、β2HCH、Endosulfan Ⅱoccupied the most part of total DDTs , HCHs and Endosulfans respectively , indicated the fate of these parent compounds or congeners. At the same time , it was found that thepositive relationship among the in2 dividual organochlorine components (HCHs , DDTs and Endosulfans) , which indicated that the similar of the source and behavior for organochlorine pesticides.海洋环境科学教育部重点实验室开放基金与教育 部重点基金联合资