Applying of the DSP Technology in the Virtual Instrument System

The hardware architecture and instruction set of the digital signal processor leads to its high speed and precision in processing data. Aiming at the virtual instrument's deficiency in speed and precision resulting from the limit of the computers' development, the author brings forward a method to promote the performance of the virtual instruments using the DSP technology. Implementing the complex algorithms in DSP and using the principal and subordinate DSP structure or DMA technology in the data acquisition card of the virtual instrument can promote the virtual instrument's real-time characteristic greatly. Several key technologies are introduced in realizing the data acquisition and processing card. The experiment shows that the digital signal processors have higher speed and precision than the computers when implementing complex algorithms, and that using the DSP to implement the algorithms is an effective method to promote the virtual instrument's performance.     

Maximum Displacement Estimation of Seismic Structures Based on Hysteresis Energy

Based on characteristics of hysteretic energy of structures which are simplified single freedom degree systems and under the short duration impulse modle mid duration and long duration modle earthquakes, correlation between the maximum hysteretic energy increment per cycle and the maximum inelastic displacement of different structures is investigated. Simplified equations to estimate the maximum inelastic displacement are obtained. The validity of the equation is recognized. It is pointed out that the impact destroy of the structures may occur when energy increment per cycleis 50 80 percent of total hysteretic energy, and the maximum hysteretic energy increment per cycle, and that the maximum inelastic displacement can be used to evaluate aseismic capacity.If energy increment per cycleis small relative to total hysteretic energy, the destroy of the structures by cumulate dissipation energy may occur, and the total hysteretic energy can be used to evaluate aseismic capacity.     

QTL analysis of deep-sowing tolerance during seed germination in the maize IBM Syn4 RIL population

In arid or semi-arid regions, deep-sowing is an effective treasure to ensure seeds absorbing water from deep soil layer at present. However, the existing maize varieties have poor tolerance to deep-sowing, which is attributed to that few genes are explored and utilised. In this study, 243 IBM Syn4 recombinant inbred lines (RIL) constructed with B73 and Mo17 as parents and 1,339 DNA markers evenly distributed in 10 chromosomes, were used for QTL analysis of deep-sowing tolerance during seed germination. There were significant differences in germination-related traits between the parental lines at 12.5 cm sowing depth. Among them, 7, 7, 5, 10 and 2 QTLs for emergence rate, seedling length, plumule length, mesocotyl length and coleoptile length were detected, respectively. These QTLs explained 2.75% to 10.49% of the phenotypic variance with LOD scores ranging from 2.50 to 8.27. In addition, 12 overlapping QTLs formed five QTL clusters on chromosomes 3, 5, 7 and 9. This study provides a basis for molecular marker-assisted breeding and functional study in deep-sowing germination of maize.     

新疆转基因棉花育种研究现状

本文简述了新疆转基因棉花育种现状，比较分析了主要转基因棉品种在新疆的表现及存在的主要问题，提出了新疆转基因棉育种的方向和加快转基因育种进程的建议。     

古槐树的保护与复壮研究

通过对古槐树的生长环境和生长状况的调查,并对植株叶片营养元素含量和生长地周边的土壤中营养元素含量进行定量分析,结果表明：土壤中的营养极度缺乏,根系得到的营养物质极为有限,这样,使根系无法生长,造成树体的伤害。在给古槐施用肥料中有必要增加N、P、Ca、Mg、Zn等营养元素,使古槐能更旺盛地生长。还对古槐树的保护和复壮提出措施,以期为延缓古树的衰老提供理论依据和切实可行的方法。     

基于SSR分子标记技术的葡萄种间杂交F1代鉴定

SSR分子标记技术以其多态性高、重复性好和检测方便快捷等优点,被广泛应用于植物F1代真假杂种的鉴定.为了长期有效的开展葡萄杂交育种工作,本研究以葡萄杂交组合'北冰红'×'贵人香'F1代159个单株及'双红'×'贵人香'F1代121个单株为试验材料,利用SSR分子标记技术结合田间形态学性状对葡萄杂交后代的真伪进行鉴定.在...     

Study On Yield of the Rape in Different Nitrogen and Density

运用二因素五水平回归正交旋转组合设计,进行施氮量与密度对油菜产量影响的研究。结果表明,随着施氮量、密度的增加,产量表现出快速增加→缓慢增加→缓慢减少→快速减少的趋势,施氮量的效应大于密度效应;油菜产量主要受全田有效角果数影响,二者相关系数为0.9577,决定系数达0.9171,而角粒数、粒重主要遗传因素影响;施氮量与密度的最佳组合是施氮量214.4~256.9kg/hm2,密度10.1万~11.1万株/ hm2,控制在此范围内油菜产量可达3000kg/hm2以上。     

食品科学与工程专业教学改革探索

论述了食品科学与工程专业教学改革的必要性,并从课程体系、理论教学、实践教学、人才培养模式等方面,分析了普通高等农业院校食品科学与工程专业的教学改革与实践。     

白香猪消化器官乳酸脱氢酶同功酶的比较研究

采用聚丙烯酰胺凝胶电泳法对成年白香猪的肝、胰、小肠和大肠等脏器组织的乳酸脱氢酶（LDH）进行分离,结果显示：它们均舍有5条LDH同功酶谱带。经生物图像处理系统扫描定量,得出LDH1、LDH2、LDH3、LDH4和LDH,各组分在肝脏中的百分含量顺序为：LDH5〉LDH2〉LDH1〉LDH3〉LDH4。M亚基：H亚基为49．52％：50．48％;在胰脏中的百分含量顺序是：LDH1〉LDH2〉LDH5〉LDH3〉LDH4,M亚基：H亚基为32．86％：67．14％;小肠中的百分含量排列依次是：LDH5〉LDH4〉LDHI〉LDH2〉LDH3,M亚基：H亚基为63．18％：36．82％;大肠中的百分含量次序是：LDH1〉LDH5〉LDH2〉LDH4〉LDH3,M亚基：H亚基为42．00％：58．00％。以上LDH同功酶在不同消化器官组织中各谱带及亚基的组成与含量的不同,反映了相应组织中的乳酸和丙酮酸问转化代谢过程的差异,由此保证了机体糖代谢中LDH所催化的反应的正常协调进行。