硫甙的生物学特性与低硫甙油菜育种研究

硫代葡萄糖甙（简称硫甙）是植物体内一类由不同氨基酸衍生而来的合硫代谢物,在十字花科及相关物种中广泛存在,硫甙及其代谢物受遗传因素和环境条件影响较大．维持正常硫甙水平是植物的一种自我保护机制,硫甙在芥子酶的作用下会生成对动物有毒的代谢物,影响其作为饲料的价值．降低种子硫甙是油菜育种的主要目标之一．     

胆囊结石并2型糖尿病腹腔镜胆囊切除术围手术期治疗

目的探讨胆囊结石并2型糖尿病手术治疗风险、手术方式的选择和围手术期处理。方法回顾性分析成功完成胆囊结石并2型糖尿病患者腹腔镜胆囊切除术（LC）72例（合并症28例）围手术期治疗。结果择期LC术65例,急诊LC术7例,全部病例治愈,术后并发症13例。结论胆囊结石并2型糖尿病由于其特殊及风险,术前应全面评估脏器功能,腹腔镜胆囊切除术以其创伤小、恢复快、腹腔干扰小等特点为首选术式,围手术期处理除需控制好血糖,改善代谢紊乱,还应积极治疗合并症,提高手术耐受性。     

喷水织机浆料制备工艺研究

研究了喷水织机专用浆料的制备工艺．采用预乳化乳液聚合工艺,根据相似相容原理及喷水织机用浆料的特殊要求,以功能性单体甲基丙烯酸、软单体丙烯酸乙酯及硬单体甲基丙烯酸甲酯作为聚合单体,探讨了乳化剂用量、引发剂用量及预乳化液滴加时间对浆液性能的影响．结果表明,当乳化剂用量为2.5％,引发剂用量为0.6％,预乳化液滴加时间为3.5h时,制备的喷水织机浆料性能优异,能满足长丝在喷水织机上的织造要求．     

中国东北地区各民族的母系遗传关系

对吉林、辽宁两地23例满族个体的线粒体高可变Ⅰ区序列进行了测定,并采用APLP分析和编码区SNP分析将这些样本归属于单倍群A,B,C,D,D4,F,M,M8a和R,结合已经发表的东北地区其他人群的母系遗传数据,对蒙古族、朝鲜族、鄂温克族、鄂伦春族、达斡尔族以及汉族人群的线粒体遗传数据进行了主成分、分子差异、中介网络分析.结果表明:同一起源地区的民族之间有较近的遗传关系,同时居住在相同或相邻地区的民族之间同样表现出较近的遗传关系,表明东北各民族向外扩张时与当地居民发生了基因融合.     

Semi-industrial experimental study on bauxite separation using a cell–column integration process

The cyclonic-static micro-bubble flotation column (FCSMC) is a highly efficient mineral processing equipment. In this study, a cell-column (FCSMC) integration process was investigated for the separation of bauxite and its feasibility was analyzed on a theoretical basis. The properties of low-grade bauxite ore from Henan Province, China were analyzed. Parameters such as reagent dosage, scraping bubble time, and pressure of the circulating pump during the sorting process were investigated and optimized to improve the flotation efficiency. On the basis of these parameters, continuous separation experiments were conducted. Bauxite concentrate with an aluminum-to-silicon (A/S) mass ratio of 6.37 and a 77.63wt% recovery rate were achieved via a flow sheet consisting of “fast flotation using a flotation cell, one roughing flotation and one cleaning flotation using flotation columns”. Compared with the full-flotation-cells process, the cell–column integration process resulted in an increase of the A/S ratio by 0.41 and the recovery rate by 17.58wt%. Cell–column integration separation technology represents a new approach for the separation of middle-to-low-grade bauxite ore.     

Sintering behavior of Cr in different atmospheres and its effect on the microstructure and properties of copper-based composite materials

Copper matrix composites consisting of chromium (Cr) or ferrochrome (Cr-Fe) as strengthening elements and molybdenum disulfide as a lubricant had been sintered in nitrogen and hydrogen atmosphere, respectively. Their morphology and energy-dispersive X-ray spectrometry (EDS) analysis showed that serious interaction occurred between MoS₂ and Cr (or Cr-Fe) particles when the samples were sintered in hydrogen atmosphere. Chromium sulfide compound (Cr_xS_y) was formed as a reaction product, which decreased the density and strength of the composites remarkably. This interaction was inhibited when the samples were sintered in nitrogen atmosphere; thus, the mechanical properties of the composites were improved.     

基于复杂网络作战体系破击的建模与仿真

在分析体系破击作战机理的基础上,根据从物质世界到观念世界的抽象过程,提出了基于复杂网络的体系破击仿真分析框架,并建立了考虑信息因子和破击能力的作战体系破击新模型。最后通过仿真实验,得到了一些结论:(1)一定条件下,体系破击的能力比攻击信息更加重要;(2)只有在一定的破击能力下,作战体系才对随机攻击表现出鲁棒性,对蓄意攻击表现出脆弱性。     

至多一个斜率变点模型的收敛速度

对线性模型中至多只有一个斜率变点τ0的模型,利用局部比较方法给出了变点τ0估计的强、弱相合性和强、弱收敛速度,同时在局部对立假设下研究了变点估计的Op收敛速度.     

基于delta方法泊松分布参数的近似信仰推断

文章主要研究了Poisson分布参数λ的近似信仰推断,利用对数变换后的估计量的渐近正态性对λ建立近似的枢轴方程,并得到其近似信仰分布和置信区间。模拟结果表明,近似信仰区间与Wald置信区间的平均长度几乎无差异,但近似信仰置信区间覆盖概率明显优于Wald置信区间的覆盖概率。     

Pt/CeO2-CNTs和Pt/CNTs在H2SO4和NaOH中乙醇电氧化活性及循环稳定性研究

为考察pH和CeO2对Pt催化剂乙醇电氧化活性的影响,用循环伏安法比较了Pt/CNTs及Pt/CeO2-CNTs在NaOH和H2SO4介质中的电化学行为,表明催化剂在NaOH介质中活性高于在H2SO4中活性,Pt/CeO2-CNTs活性高于Pt/CNTs活性.因Pt催化剂上乙醇电氧化反应的tafel斜率接近,故活性不同可归于影响交换电流密度的OHad浓度的差别.NaOH中Pt表面OHad吸附起始电位和乙醇电氧化起始电位分别低于H2SO4中起始电位,表明OHad决定着Pt催化剂的乙醇电氧化活性.加速耐久性实验表明,CeO2可改善Pt/CNTs的循环稳定性,Pt/CeO2-CNTs和Pt/CNTs在H2SO4中稳定性优于在NaOH中稳定性.