软肝丸对肝细胞再生作用的研究

本实验中采用了新药物研究中认可的ＣＣＬ４诱导大白鼠慢性肝损害的模型作为研究对象．病理结果说明使用软肝丸有良好的抗细胞坏死，能明显抑制肝纤维化过程，促进肝细胞再生作用．药效学的研究，也提示软肝丸可以降低血清ＡＬＴ及肝组织中的羟脯氨酸的含量．     

模拟酸雨对草甸棕壤中重金属迁移的影响

通过室内模拟试验，研究了沈阳地区酸雨对当地草甸棕壤中Ｃｄ、Ｐｂ、Ｃｕ、Ｚｎ和Ａｓ垂直迁移的影响，结果表明，酸雨能促进Ｃｄ、Ｐｂ、Ｃｕ和Ｚｎ的迁移，随酸雨酸度增加其促进作用也加强，而且酸雨对Ｃｄ、Ｚｎ的影响大于Ｃｕ、Ｐｂ、Ａｓ的迁移只有在弱酸性酸雨条件下才有增加，在强酸性酸雨条件下，Ａｓ的迁移受到抑制。     

桑蚕抗氟性遗传模式的研究

本试验以抗氟性差异较大而抗逆性较强的一对品种９５７和杭８作为杂交亲本，用较小的浓度倍数系列，在ＬＣ５和ＬＣ９５范围内，设置８个浓度档次，对其杂交和回交后代的抗氟性情况进行测定，作出了ＬＣ－Ｐ线，由此根据坫冢本模型推导出桑蚕的抗氟性遗传模式是由一对显性主基因控制的，并有一些修饰基因起辅助作用．实验结果同时表明，抗氟性遗传存在明显的偏母遗传现象．     

太湖湖滨湍流通量和输送系数的计算分析

利用太湖湖滨实测的近地层温、风、湿资料、扫Ｍ－Ｏ相似理论导出的廓线方法,计算分析了近地层湍流通量、输送系数ＣＤ和ＣＨ。结果表明,ＣＤ、ＣＨ随稳定度有明显变化;ＣＨ〉ＣＤ;湍流通量和ＣＤ、ＣＨ都有明显日变化,湖滨地区ＣＤ、ＣＨ的日变化比天津市区的日变化辐度小。     

头颈癌患者手术前后T细胞亚群的观察

对３０例头颈癌患者手术前后的Ｔ淋巴细胞亚群变化进行观察，结果表明：头颈患者的ＣＤ＋８较对照组明显升高（Ｐ＜０．０１），ＣＤ＋４／ＣＤ＋８值比健康人显著降低（Ｐ＜０．０１），且有随临床分期增加而ＣＤ＋８升高及ＣＤ＋４／ＣＤ＋８比值下降的趋势，Ⅰ－Ⅱ期与Ⅲ－Ⅳ期相比有显著性差异（Ｐ＜０．０１）；而手术后ＣＤ＋８逐渐下降，ＣＤ＋４／ＣＤ＋８值却较术前有明显回升，术前与术后比较有显著性差异（Ｐ＜０．０１）．说明头颈癌患者存在着明显的细胞免疫功能紊乱，并随病情的发展而加重；而彻底切除肿瘤是迅速恢复机体细胞免疫功能的有效手段．提示：Ｔ淋巴细胞亚群检测对头颈癌患者的病情发展、免疫功能评定及疗效观察具有一定参考价值     

负载Cu,Ag氧化物催化剂的氧化活性和热稳定性

考究了Ａｌ２Ｏ３，ＣｅＯ２，ＴｉＯ２负载Ｃｕ，Ａｇ氧化物催化剂的氧化活性及ＣｕＯ／ＣｅＯ２，ＣｕＯ／Ａｌ２Ｏ３催化剂的稳定性。结果表明，载体对催化剂的活性有明显影响，对于ＣＯ氧化，Ｃｕ系催化剂中ＣｕＯ／ＣｅＯ２活性最高，Ａｇ系催化剂中，Ａｇ２Ｏ／Ａｌ２Ｏ３活性最好。     

金融抑制背景下农村金融对农民收入影响的思考

在我国经济二元结构的大背景下,广大农村地区普遍出现了金融抑制的现象,农村金融的发展对农民收入的增长产生了重大影响。在金融抑制的情况下,农村金融促进农民收入增长的作用主要取决于农业投资回报率、农村金融贷款利率、农户融资成本以及农业投资风险四个因素。结论表明,农业投资回报率越高,农村金融融资利率、农户进入农村金融市场的成本以及农业投资的风险越低,农村金融对农民收入的作用就越明显。     

Cr—Ag／γ—Al2O3催化剂对CO的氧化性能研究

采用浸渍法制备了一系列γ－Ａｌ２Ｏ３负载的Ｃｒ－Ａｇ双金属氧化物催化剂，并考察了对ＣＯ的氧化活性．结果表明，由Ｃｒ（ＮＯ３）３、ＣｒＯ３、Ｃｒ２（Ｃ２Ｏ４）３作为Ｃｒ源制备的单组分Ｃｒ－／γ－Ａｌ２Ｏ３催化剂对ＣＯ的氧化活性基本相同，且均较差；但添加少量Ａｇ（＜２ｗｔ％）却能明显提高Ｃｒ／γ－Ａｌ２Ｏ３催化剂对ＣＯ的氧化活性，且分步浸渍法制备的Ｃｒ－Ａｇ／γ－Ａｌ２Ｏ３双组分催化剂的活性明显优于用其浸渍法制备的催化剂     

茶多酚抗突变和消除自由基作用的研究

采用Ｅ．ＣｏｌｉＳＯＳ显色法，小鼠骨髓细胞微核及染色体畸变试验和体外自由基消除实验等方法测定了茶多酚复合物（ＴＰ）的抗突变和消除自由基作用．结果表明：（１）ＴＰ的终浓度在２．５和５ｍｇ／ｍｌ时，对由阳性致突变物ＭＮＮＧ，ＥＭＳ和ＮａＮ＿３诱导的ＳＯＳ应答反应均具有明显的抑制作用；（２）小鼠每日ｉｇ４０、８０和１２０ｍｇ／ｋｇ剂量的ＴＰ能明显抑制由环磷酰胺（ＣＰ）诱发的骨髓ＰＣＥ的ＭＮＣＦ，三种剂量ＴＰ的抑制率分别为４０．９８％、６６．７６％和６５．９４％；（３）ＴＰ对ＭＭＣ诱发的骨髓细胞染色体畸变（ＣＡ）的抑制率分别为６２．５６％、５５．７１％和４７．９５％；（４）在Ｘ／ＸＯ－ＥＳＲ、Ｘ／ＸＯ／Ｌｕｍｉｎｏｌ－ＢＣＬ和ＩＲ／ＮＢＴ－ＳＰＭ三种模型中ＴＰ对超氧阴离子Ｏ＿２自由基均具有极强的消除作用，消除率分别为９８±６％、９８±１．２％和９５±１．５％，对Ｏ＿２的消除效率明显强于维生素Ｃ和Ｅ，对不同工艺制备的ＴＰ消除活性氧自由基作用的测定结果显示：脱咖啡碱程度高，ＥＧＣ和Ｌ－ＥＧＣＧ含量比例高的ＴＰ－３制剂消除Ｏ＿２的效率最高．因此，ＴＰ消除有害自由基，中断或终止自由基的氧化反应是抗突变，抗肿瘤作用的主要机制     

A320液压系统PTU连续工作故障浅析

PTU连续工作的不正常现象我们可以通过两个方面得知。通过SD页面上的指示,一直有黄系统到绿系统的绿色实心箭头或者是绿系统到黄系统的绿色实心箭头。可以通过结合相关原理,例如操作货舱门时,PTU会自动抑制,然而在SD页面上产生绿色箭头指示是明显不正常的现象。二是通过耳朵,我们可以站在客舱,例如双发启动完毕后,我们可以通过耳朵听到PTU持续运转的不正常的噪声。     

External quality assessment for the RIA of thyroid related hormones: Second phase

An external quality assessment was conducted to assess the performance of various laboratories for RIA of thhyroid related hormones in two phases. In the first phase thirty five laboratories participated. At the end of first phase a meeting cum workshop was organised to discuss the results of first phase, difficultires faced by the participants and pinpoint the short oming. A second phase was then initiated with an objective of improvement in the performance, if any, where twelve samples from four pools were distributed to twenty four laboratories who participated for the second phase. The overall return of the results increased significantly from 71.8% (1586/2208) for the first phase to 92.4% (732/792) for the second phase. The inter laboratory %CV for T₃, T₄ and TSH were lower during the second phase (30.6%, 19.0% and 31.6% respectively) as compared to those observed during first phase (36.3%, 22.7% and 52.8% respectively). Similarly, there was an improvement in reproducibility of ALTM as %CV for T₃, T₄ and TSH decreased from 6.0%, 9.8% and 13.4% respectively to 4.5%, 4.6% and 8.5% respectively. The individual performances of the participating laboratories viz. bias, variability of bias and imprecision also showed a trend towards improvement as percent laboratories having desirable or acceptable results for T₃, T₄ and TSH increased from 10.7%, 60.7% and 0.0% respectively to 20.8%, 66.7% and 22.2% respectively. External quality assessment thus appears to be beneficial in assessing the performane of a laboratory in comfparison with other laboratories and indeed helps in improving the performance.     

中国绿色食品产业发展演化阶段的判定与分析

通过分析绿色食品产业所处生命周期阶段及其特征,运用生长曲线(逻辑斯蒂曲线和龚伯兹曲线)拟合绿色食品产业的发展演化过程,对其整体演化轨迹进行测定并进行阶段划分。得出的基本结论和启示是:①中国绿色食品产业发展从2006年开始进入快速发展的成长期,产业呈现明显的上升态势;②绿色食品产业经过成长期的适度规模扩张后必须积极促进绿色食品产业向成熟期过渡,政府产业政策的重点不是做"大"而是做"强",通过进行产业结构调整,提高绿色食品产业的技术含量与创新能力,实现产业效率提升和产业竞争力增强。研究结论对于揭示绿色食品产业发展演化的内在规律,为政府制定符合生命周期阶段特征的产业发展规划与产业政策提供了科学依据。     

混合层中四涡合并过程的数值研究

用拟谱方法对混合层四涡合并的规律进行了数值研究。分析了其波和次谐波之间相位差对涡合并过程的影响,并引入旋转点和拉伸点的概念对种影响进行了解释。计算结果表明：四涡的合并存在６种形式,因此,可以通过施加多级次谐波并改变它们之间的相位差主动控制拟序涡的发展和演变。     

重油催化裂化沉降器油气相态计算

为了确定重油催化裂化沉降器中液相组分的数量及其对结焦的贡献，以工业重油催化裂化装置的沉降器为研究对象，按照正构烷烃模型分子法确定基团组成的方法，利用已编写的气化率计算程序，求取了沉降器内反应油气的重组分——油浆馏分的气化率，确定反应油气的气、液相比例。计算结果表明，在实际工业操作条件下，重油催化裂化沉降器内的油浆馏分以气、液两相状态存在，其露点温度为488.8℃，露点温度直接取决于油浆终馏分的沸程，而且油浆分压对其泡点和露点温度也有较大影响。     

建国以来我国公民科学素质建设的基本历史

以现代化范式为主要参照系,同时考虑到革命化范式的影响,考察了近代中国社会历史变迁过程,以此为背景主要展现了建国以来我国公民科学素质建设的基本历史,并对这段历史做了分期。分析了与之相关的中国公民科学素质概念的历史变化。     

Polymorphisms of CYP1A1, GSTM1 and GSTT1 Loci as the Genetic Predispositions of Oral Cancers and Other Oral Pathologies: Tobacco and Alcohol as Risk Modifiers

Polycyclic aromatic hydrocarbons of tobacco require activation by phase I enzymes, such as cytochrome-P4501A1 (CYP1A1) to become an ultimate carcinogen, which are subjected to detoxification by phase II enzymes, especially glutathione S-transferases (GSTs). A study was designed to find whether genetic predisposition are risk modifiers of oral pathologies. The study included 102 cases with Oral Cancers (OCs), 68 cases with nonmalignant pathologies, 100 cases as control group. GSTM1 null genotype was associated with increased risk of OCs but not with benign pathologies. Deleted GSTT1 was associated with all pathologies. Both m1m2 and m2m2 polymorphisms of CYP1A1 were associated with oral pathologies.     

清末中日数学交流与中国数学教育的现代化

清末中日数学交流是现代中国数学史中的重大事件。在政府和民间的共同努力下,通过日本,中国引进和建立了现代数学教育制度。与此同时,留学日本的中国人将大量日文数学教科书翻译成中文,并且回国担任数学教师。在他们的努力下,中国的数学教育实现了现代化,中国数学也融入世界数学主流中。     

Rock-salt and helix structures of silver iodides under ambient conditions

Many different phase structures have been discovered for silver iodides. The β and γ phases were found to be the most common ones at ambient conditions, while the rock-salt phase was found to be stable under pressures between 400 MPa and 11.3 GPa. Recently, the α phase was demonstrated to be stable under ambient conditions when the particle sizes were reduced to below 10 nm. However, no other phase has been reported to be stable for silver iodides under ambient conditions. Rock-salt and helix structures have been found to be stable under ambient conditions in this study. The structures have been characterized by elemental mapping, Raman scattering, and high-resolution transmission electron microscopy. The stabilities of these structures were also confirmed by molecular dynamics and density functional theory.     

Design of an adaptive missile autopilot considering the boost phase using the SDRE method and neural networks

An adaptive autopilot to control a skid-to-turn missile during its boost phase is designed using the state-dependent Riccati equation (SDRE) method and neural networks (NN). To address the rapid changes in parameters during the boost phase, the translational and rotational motions of the missile are modeled with time-varying velocity and inertial parameters. The autopilot with a two-loop structure is designed to perform integrated roll-pitch-yaw control of the missile with cross-coupled dynamics; each loop has a baseline controller and an adaptive controller. The baseline controller is designed using the SDRE method for reference command tracking in a nominal environment, and the adaptive controller is designed based on NN to manage uncertainty during the boost phase. Stability analysis of the closed-loop system is performed, and the performance of the proposed autopilot is demonstrated by numerical simulation.     

开都河日径流时间序列混沌分析与模拟

本文利用相空间重构技术和混沌理论讨论了开都河日径流的混沌性质。通过日径流时间序列的功率谱分析,从定性角度讨论了日径流时间序列的混沌特征。进一步根据互信息量法得到相空间重构的延时,再根据Cao方法得到相空间重构的嵌入维数。利用Matlab软件计算得到相空间重构的延时和最佳嵌入维数分别为τ=6,m=14。这样将一维的开都河日径流时间序列重构成14维的相空间。通过最小数据量法计算出开都河日径流时间序列最大Lyapunov指数。利用最大Lyapunov指数对开都河日径流时间序列进行定量混沌分析。最后通过二阶Volterra自适应一步模型进行模拟。结果表明：开都河日径流时间序列的功率谱是连续的,功率谱呈现随频率增高而以指数方式递减趋势,区别于具有离散尖峰谱特征的周期时间序列和具有连续的、频率和振幅不相关谱特征的随机时间序列。这从定性角度表明开都河日径流时间序列具有混沌特征。通过计算得到开都河日径流时间序列的最大Lyapunov指数0〈λmax=0.0097〈1,从定量角度表明开都河日径流时间序列具有较弱的混沌特征。利用二阶Volterra自适应一步模型模拟得到相关系数和相对均方根误差分别0.9376和0.2390。这说明利用Volterra自适应模型模拟效果较好。