国家甜菜区试品种在甘肃河西走廊丰产与稳定性及抗病性评价

用品种稳定性参数及高稳系数（HSC），对2004～2005年参加国家甜菜区试中的5个品种在甘肃武威市黄羊镇和酒泉地区的试验结果进行了综合分析，结果表明：BTS356的丰产、稳产性好．两年平均根产量和产糖量分别较对照陇糖2号增产40．62％和39．94％，差异达极显著水平，含糖率18．73％；对黄化病、白粉病、立枯病的抗性优于对照，具有较高的应用价值，适宜在甘肃省河西走廊生态条件下推广种植。     

几种典型地貌条件下的管线选择

不同的地形地貌会有不同的管线选择原则，而在相同的地形地形条件下，也会有不同的线路选择方案。线路选择的优劣会直接影响管道工程的施工、投资及今后的运营管理。介绍了平原地区、山岭地区、山岖河谷地段、黄土地貌等典型地区条件一的管道选线原则和敷设方案，指出在实际定线过程中，有时在同一区段会同时出现两种地貌，应综合考虑，抓住地貌地质的主要特性，选出最优方案；在选线过程中，应把管道的稳定和安全放在首位，只有满足     

Non‐linear thermodynamic laws application to soil processes

An attempt has been made to analyze the possibility to use nonequilibrium thermodynamics for the soil dynamic open systems’ treatment. Entropy change of such a system is expressed by the entropy sum produced within the system and the entropy coming from or going into the outer sphere.

In the steady state, dynamic soil‐formation processes occur within an organized structure and are characterized by stable parameters close to equilibrium. Accordingly, when examining soil, one can proceed from the conventional thermodynamic equilibrium. However, the matter of Onzager‐Prigozhin general phenomenological theory applicability to soil processes is more complicated. To study soil stability it is necessary to go beyond the limits of linear thermodynamics.     

人工诱变四倍体玫瑰香葡萄的遗传稳定性研究

对人工诱变的两个同源四倍体玫瑰香葡萄单株－－四玫Ⅰ和四玫Ⅱ进行细胞组织学和遗传稳定性研究，结果表明：（１）经过连续３代的扦插，其组织发生层倍性结构没有变，四玫Ⅰ仍然是４－４－４型，四玫Ⅱ仍然是２－４－４型；（２）四玫Ⅰ和四玫Ⅱ的实生苗均为４－４－４型。     

电动液压助力转向系统对整车操纵稳定性影响分析

对电动液压助力转向系统各部分建立数学模型,基于Matlab软件里的S imu link模块对电动液压助力转向系统模型和四自由度车辆模型所组合的系统模型进行仿真。分析了在不同转向盘角阶跃输入速度、不同车速下的横摆角速度和侧向加速度对汽车操纵稳定性的影响,揭示了转向特性与车速和转向盘角阶跃输入速度的内在关系。     

Osmotic Adjustment in Maize (Zea mays L.): Changes with Ontogeny and its Relationship with Phenotypic Stability

Genetic variation for osmotic adjustment was examined in a group of maize hybrids during vegetative and silking stages. Estimates of osmotic adjustment were derived from measurements of leaf relative water content (RWC) and osmotic potential (Ψ o ) before day-break. The degree of adjustment was estimated from the In RWC/In Ψ o relationship. All cultivars examined showed some degree of osmotic adjustment and significant differences (P < 0.05) were found among them. The utility of measurements in early vegetative stages as a mean of selection for osmotic adjustment in silking stage was established. A positive tendency was observed between osmotic adjustment and phenotypic stability.     

某汽车转向纵拉杆设计分析

转向纵拉杆是汽车转向传动机构中重要的零部件,通过转向纵拉杆受力分析,对转向纵拉杆的强度、稳定性进行了校核,提供了纵拉杆设计分析的参考.     

Assessment of clonal fidelity of micropropagated gerbera plants by ISSR markers

True-to-type clonal fidelity is one of the most important pre-requisites in micropropagation of crop species. Genetic fidelity of in vitro raised 45 plants of gerbera (Gerbera jamesonii Bolus) derived from three different explants, viz., capitulum, leaf and shoot tips, was assessed by 32 ISSR markers, for their genetic stability. Out of 32 ISSR markers, 15 markers produced clear, distinct and scorable bands with an average of 5.47 bands per marker. The markers designed from AG motif amplified more number of bands. The markers anchored at 3′ ends produced high number of consistent bands than unanchored markers. Fifteen ISSR markers generated a total of 3773 bands, out of which 3770 were monomorphic among all the clones. The Jaccard's similarity coefficient revealed that out of 45 clones derived from different explants, 44 were grouped into a single large cluster alongwith the mother plant with a similarity coefficient value of 1.00, whereas one clone (C38) remained ungrouped. The clones derived from capitulum and shoot tip explants did not show any genetic variation, whereas, one of the leaf-derived clones exhibited some degree of variation.     

星型环氧乳化剂合成及乳液的性能研究

采用自制星型乳化荆合成水性环氧乳液，考察了乳化剂的结构与环氧乳液稳定性及涂膜性能的关系，优化了乳化荆在制备环氧乳液过程中的主要参数。研究结果表明：聚乙二醇和环氧树脂E-20中环氧基与羟基的物质的量比为1．5：1．0、聚乙二醇的相对分子质量为4000、乳化剂用量为10％时，制备的环氧乳液稳定性高、成膜性能优良。     

影响烟草切茎繁殖的几个因素分析

带叶切割５～６茎节烟苗茎节置２８℃沙床保湿培养，６～１０ｄ茎上生出不定根，同时腋芽开始生长。１株烟苗经２次无性繁殖可扩增到２５～３５株。该无性系在株高、单株叶数、抗病性等方面均比亲本实生苗整齐