苦马豆的组织培养与快速繁殖

[目的]研究苦马豆的组织培养与快速繁殖的方法.[方法]以苦马豆上胚轴为外植体,MS为基本培养基,通过不同的激素种类和浓度配比,建立苦马豆组培快繁体系.[结果]组织培养与快速繁殖的培养基为:诱导愈伤培养基为MS+6-BA2.0mg/L+2,4-D 0.25 mg/L;继代培养基为MS+6-BA 2.0 mg/L+NA.A0.5 mg/L;诱芽培养基为MS+NAA 0.05 mg/L+ZT0.05 mg/L+AC 0.1;;生根培养基为1/2 MS+ IBA1.5 mg/L+蔗糖(Suc)3;.该组培苗适宜移栽于珍珠岩+蛭石(1∶1)基质中,平均成活率80;.[结论]筛选获得适宜苦马豆上胚轴为外植体的组培快繁的培养条件,为苦马豆快繁体系的建立探索出了一条新的有效的途径.     

丙酸钙对泌乳早期奶牛泌乳性能和代谢产物的影响

选用32头经产奶牛,根据泌乳期、上个泌乳期305 d产奶量和预产期,采用随机区组设计分为4组,对照组饲喂基础日粮,处理1、2、3组分别在基础日粮基础上添加丙酸钙100、200、300 g/d.结果显示,日粮添加丙酸钙对奶牛的采食量、乳脂率、乳蛋白率、乳糖率和乳干物质率无显著影响,200、300 g/d组产奶量和饲料转化效率显著高于对照组(P<0.05).200、300 g/d组血浆葡萄糖和胰岛素浓度显著高于对照组(P<0.05),而血浆游离脂肪酸和β-羟丁酸浓度显著低于对照组(P<0.05);200、300 g/d组尿酮浓度显著低于对照组和100 g/d组(P<0.05).试验结果表明,丙酸钙适宜添加量为200 g/d.     

宁夏回族自治区土地整治项目绩效评价

本研究采用AHP（层次分析法）和多层次模糊综合评价法,构建土地整治项目绩效评价体系,并对其进行实证分析。笔者以宁夏回族自治区土地整治项目中的10个试点项目为例,结合项目区实际情况,从资金使用情况、项目执行情况、项目管理情况和项目建设情况4个维度进行评价,旨在为土地整治项目绩效评价提供新的思路与方法。结果表明：宁夏回族自治区土地整治项目绩效等级优良,占81%。建议从设立土地整治绩效评价机构,建立健全信息报备系统,建立电子绩效评价系统3方面入手,建立土地整治项目绩效评价的长效机制。     

气液叉流下受热液膜的热质传递特性

采用VOF两相流模型研究了气液叉流条件下受热液膜热质传递特性,在模型中添加了表面张力源项和气液相间传质源项.为了验证所建立模型的可靠性,采用非接触式红外热成像测温方法,进行了相应的气液叉流试验.对叉流条件下受热液膜热质传递过程进行了试验和模拟计算,结果显示无量纲壁面温度计算结果与试验结果吻合很好.应用所建立的模型,模拟计算并分析了表面张力、固液接触角、液膜流量等因素对液膜流动侧形和热质传递性能的影响,结果表明：在其他参数保持不变的情况下,表面张力从0.014 N／m增大到0.072 N／m的过程中,液膜覆盖面积由82.7％减小到73.2％;固液接触角从30°增大到60°的过程中,液膜覆盖面积由80.6％减小到69.4％;液膜流量越小,液膜厚度越小,越有利于液膜的蒸发;相反,较高的液膜流量会使液膜厚度增大,阻碍了液膜蒸发,从而使外掠过液膜的单位体积空气含湿量减小.     

An evaluation method of design ability usingmental workload assessment

By analyzing the relationship between design ability and design time, mental workload, and design effect, an evaluation method of design ability is proposed. As far as the factors involved in such method are concerned, mental workload is measured by NASATLX (national aeronautics and space administration task load index) scale, design time is acquired with a special program, and design effect is scored by expert. Then, the time spent on new design tasks based on the evaluated ability level is predicted by using support vector machines, which is then compared with real measured time. The result shows that the predicted time is well accorded with the real time, which indicates that the evaluation method of design ability is valid.     

Simulation study of stochastic fluctuating wind field for wind turbine blades

The differences of the wind field model between wind turbines and common architectures are investigated. It is indicated that substantial frequency contents are transferred to rotor rotation frequency and its harmonics due to the periodic motions of blade. According to standard von Karman power spectral density (PSD) model and rotationally sampled PSD model, the PSD matrix for turbulence on blades of wind turbine is setup. The longitudinal turbulence’s time serials is simulated based on the superimposition of harmonic waves.     

Numerical simulation of the influences of catalytic wall on methane combustion characteristics in micro combustor

In order to study the effects of different catalytic walls on combustion characteristics, the premixed catalytic combustion characteristics of methane/air in micro combustor are studied. It lays the foundation for the combustion technology of hydrocarbon fuel in micro engine. Numerical simulation of flow and catalytic combustion in micro combustor was done by using laminar finite rate and second order upwind discretization methods. The results show that when wall temperature,CH4/O2 mole ratio and methane mass flow rate change, the influence of lower catalytic wall on the methane catalytic combustion efficiency is biggest, followed by side catalytic wall, the smallest is upper catalytic wall. The methane catalytic combustion efficiency unit area of lower catalytic wall is about three times of that of upper catalytic wall. The utilization of catalyst on lower catalytic wall is maximal . Therefore, when coating catalyst, the quantity of katalyst on lower catalytic wall should be appropriate more, moderate on the side catalytic wall, as little as possible on the upper catalytic wall. The influence disciplinarian and contribution rate of different catalytic wall on methane combustion have been gained. The optimized strategy of catalyst coating was put forward and reduced the cost of catalytic combustion.     

糯小麦新品系扬05G68配粉对面条品质的影响

为明确糯小麦扬05G68在改善面条品质方面的应用价值,为其推广应用提供依据,利用2种不同筋力市售面粉,研究了添加30%、50%和70%比例的糯小麦扬05G68面粉对干、鲜面条品质指标的影响.结果表明:糯小麦扬05G68面粉添加比例在30%与50%之间能显著改善面条品质;加工成鲜面条时,添加30%糯小麦面粉的面条评分最高;加工成干面条时,添加50%糯小麦面粉的面条评分最高;筋力强的面粉可以适当增加添加比例.     

江苏与山东农村经济比较研究

本研究从江苏与山东两省农村经济的总体发展和结构入手,比较了两省农村经济发展的历史,剖析了区位与交通、自然资源条件、农村劳动力、农业产业化、农业竞争力、外向型农业经济、经济改革措施等影响两省农村经济发展的主要因素,探讨了江苏与山东两省农业和农村经济发展的轨迹、经验和方略,在此基础上有针对性地提出了进一步做大做强两省农村经济的意见和建议.     

植物的亲水疏水特性与农药药液行为的分析

通过观察,雨水能很好地在棉花、黄瓜、桃树等植物叶面铺展成水膜,能很好的沾湿石榴、扁豆、辣椒等植物,在叶面形成弧形或半圆形的水滴,但雨水不能使红花酢浆草、水稻、甘蓝等植物润湿,而是在叶面形成球形的水珠,极易滚落.大于31.25 mg/L TX-10水溶液和大于200 mg/L杀虫单-矿物油微乳剂的表面张力均小于水稻或甘蓝的临界表面张力,因此在水稻或甘蓝叶面能形成弧形或半圆形的水滴,很好地沾湿叶片,甚至可以在叶面铺展成水膜.