氮肥与化控配合应用对棉花产量和品质的影响

1989～1991年采用均匀设计和计算机处理技术。研究了氮肥与化控配合应用对棉花产量、品质性状的影响,建立了以皮棉产量、纯利润、霜前花率、僵瓣率和纤维长度等为目标性状的二元二次函数模型。解析结果表明:氮肥是影响棉花产量和品质的主要因素,其增减对产量和品质的影响较大,适量施氮产量、效益高;随着氮肥用量的增加,霜前花比例下降,僵瓣率提高。适当化控有改进品质、提高产量、增加效益的作用。氮肥与化控之间存在协同效应,表明增施氮肥同时适当化控有利于产量、品质和效益的提高。在本棉区中等偏上肥力水平的条件下,每公顷产皮棉1200～1425kg、纯利润8100～9600元的优化方案是:纯氮112.5～150.0kg/hm~2,化控缩节安量为30～72g/hm~2。     

An Optimization Model and Its Computer Software System for Regulation of Alloy Elements During Steelmaking Process

In this paper, an optimization model is designed for regulating alloy elements during steelmaking process, and a real-time computer software system has been developed based on the characteristics of alloy steelmaking. The results indicate that the system is of good operation performance, remarkable economical benefits and higher application value.     

Theoretical Research on Characteristics of Polarization Controller Basedon a Fiber Recirculating Delay Line with a Twisting-Fiber Device Introduced

The transformation characteristics of the controller based on a fiber-recirculating delay line in which the twisting-fiber device is introduced are analyzed by the useof coupled-mode and matrix optics theory,the Jones matrix representing this controller is obtained,and the effect of twisting fiber ori the polarizdtion characteristics of this controller is analyzedtheoretictically.     

驼绒藜属牧草种子生理学特性的研究--营养成分、植物激素与种子活力相关性分析

本论文对驼绒藜属植物种子的生理学特性进行了研究,包括种子的活力、种子的营养成分、激素水平等内容,同时对种子的劣变机理进行了探讨.驼绒藜属牧草种子在营养成分及激素含量上存在种间、生态型间及株龄间的差异,相关分析表明,种子含糖量及内源激素与种子活力相关性均不显著,种子氮、磷含量与种子活力有显著的相关性.对驼绒藜属植物种子短命和劣变原因的初步分析,认为是由遗传和环境两方面的原因所至,一是由于驼绒藜植物属于高数量低营养种子类型,种子自然寿命较短;二是由于种子发育过程中自然环境恶劣,造成种子营养不良,发育程度较差;三是由于贮藏条件不适宜,尤其是含水量较高,造成种子劣变加速.     

山西省野生刺梨的初步研究

本文首次对山西省野生刺梨进行了生物学特性、矿质营养成分分析以及生物化学等方面的初步研究,经测定得知刺梨桨果中含有丰富的营养物质,是一种有待开发利用的果树资源.     

水稻苗期耐盐性遗传的世代平均数分析

以耐盐品种Pokkali和盐敏感品种Peta为亲本配成一套9家系材料，分别用60和100 mol/m3NaCl盐渍营养液对其4周龄秧苗持续处理4周后考察死叶级别和地上部鲜干重比值的世代平均数。多元回归分析表明，2项指标都存在显著的遗传、盐浓度和遗传×盐浓度效应。其中遗传效应由基因加性、显性或加性×加性分量构成，遗传×盐浓度效应含     

梨抗寒新品种“秋月梨”的增产潜力分析及配套栽培技术

秋月梨经过几年的区域试验,表现出稳定的性状,具有抗寒性强、丰产,口感佳以及商品性好等特点,深受广大果农和消费者的喜爱,具有较大的发展潜力。通过对2008～2012年连年区域试验产量对比分析和总结,探讨出适宜该品种的配套栽培技术,从而提高现有的产量水平,提高种植效应。     

Sorghum bran in the diet dose dependently increased the excretion of catechins and microbial-derived phenolic acids in female rats

Sorghum bran is concentrated with procyanidins (predominately polymers), which may be beneficial for health in humans; however, the bioavailability of procyanidins is not well-understood. Female Sprague-Dawley rats were fed an AIN93G diet containing 0, 5, 10, 20, or 40% Hi-tannin sorghum bran (n = 5-7 for each group) for 50 days. Sorghum bran contained 23.3 mg/g of procyanidins. The urinary excretions of catechin, epicatechin, methylated catechins, and phenolic acids were analyzed using liquid chromatography-tandem mass spectrometry. Sorghum bran dose dependently increased the urinary excretion of catechin (0-2.2 nmol/day) and 3'-O-methylcatechin (0-9.5 nmol/day). Their serum concentrations also increased with dose (range of 0-14 nM for 3'-O-methylcatechin). Among the 14 phenolic acids analyzed, 3,4-dihydroxybenzoic acid, 3-methoxy-4-hydroxybenzoic acid, and 4-hydroxyphenylacetic acid dominated in the serum (1.8-8 micromol/L). In the urine, 3-methoxy-4-hydroxyphenylacetic acid, 3-hydroxyphenylacetic acid, and 3-hydroxyphenylpropionic acid dominated and their excretion increased significantly with the level of sorghum bran in the diet. The summed phenolic acid excretion was 0.8 micromol/day in the control group and increased to 23 micromol/day for 40% sorghum bran group. The hippuric acid excretion ranged from 2.2 to 16.2 micromol/day and peaked in the 10% sorghum bran group. On the basis of chromic oxide, a nonabsorbable marker, total procyanidins and polymers disappeared progressively, and significant degradation occurred in the cecum and colon. Catechins and procyanidins in sorghum were bioavailable; however, bacteria-derived phenolic acids were the predominant metabolites of procyanidins. Procyanidins degraded in the gastrointestinal tract. Depolymerization was not observed.     

三峡库区紫色土渗流—应力的耦合关系

[目的] 研究三峡库区紫色土在渗流与应力耦合作用下的渗透特性和抗剪强度特性,深入探究紫色土应力—渗流的耦合关系,为农业工程、边坡工程、水土保持等实际工程应用提供理论参考。[方法] 以三峡库区紫色土为研究对象,借助SLB-1A型应力应变控制式三轴剪切渗透试验仪,分析多因素耦合对紫色土抗剪强度特性和渗透性的变化。[结果] 含水率对三峡库区紫色土的黏聚力c与内摩擦角φ的影响程度不同,并在含水率为11%处取得峰值,内摩擦角随含水率增大而减小,二者变化趋势符合线性变化的特征;紫色土渗透性的变化在不同含水率梯度间存在较大的差异性,且含水率在11%～13%之间时差异性相对显著;以渗透压等于40 kPa为临界值,紫色土的渗透性降低形式不同;主应力差控制值越大,不同含水率紫色土的渗透性降低越显著。[结论] 渗透—剪切作用下,含水率和围压极大影响了紫色土的抗剪强度,其黏聚力在含水率11%处取得峰值,黏聚力和内摩擦角的变化符合线性变化;相同条件下,主应力差控制值越大,不同含水率紫色土的渗透性降低越显著,主应力差的贡献率高于含水率。各因素对影响紫色土渗透性的贡献率由高到低依次为：渗透压＞主应力差＞围压＞含水率。