生境对无芒雀麦幼穗分化进程及生殖格局的影响

以乌苏1号无芒雀麦为材料,设置2个生长环境（荒漠绿洲区、高海拔地带）,通过观测幼穗分化进程及开花习性,探究生境对无芒雀麦幼穗分化及生殖格局的影响。结果表明,无芒雀麦幼穗分化从分蘖期开始至抽穗期结束,分为初生期、伸长期、结节期、小穗原基分化期、小花原基分化期、雌雄蕊原基分化期、雌雄蕊形成期和完穗期8个时期。幼穗分化是从生长锥顶端第1枝梗原基与小花原基开始分化,相同小枝梗上原基与小花原基均是自下逐渐向上发育;整穗是从顶部向下逐渐开花,下部枝梗开花时间小于上部枝梗;小穗上的小花由下向上逐步开花。与荒漠绿洲区相比,高海拔地带的无芒雀麦幼穗分化时间晚,周期缩短,穗部赤霉素（GA）、脱落酸（ABA）及叶片可溶性蛋白含量相对较高,细胞分裂素（CTK）含量和种子千粒重较低,但高海拔地带单穗成熟种子粒数与单位面积内种子产量高,更适合无芒雀麦种子生产。     

黑龙江省水稻单产增长潜力预测方法研究

水稻是黑龙江省的主要粮食作物。加入WTO后,水稻生产、贸易、进出口等方面都面临新的形势,同时水稻产量的稳定和增长对于国家粮食安全、人民生活水平提高以及农民奔小康都有着重要意义。因此,探讨了应用Peal曲线函数模型对黑龙江省水稻单产进行预测的方法。     

甜菜夜蛾(Spodopteraexigua Hübner)雄蛾触角对雌蛾性信息素的EAG反应

采用EAG生测技术研究表明,甜菜夜蛾雄蛾触角上具有4种性信息素组分(Z9,E12-14Ac(A)、Z9-14OH(B)、Z9-14Ac(C)和Z9,E12-14OH(D))的感受细胞.单一组分A,二元组分AB和AD,三元组分ABC、ABD和ACD及四元组分ABCD的EAG反应显著较高,与3头雌蛾性信息素腺体浸提液的反应强度相当.进一步对AB二元混合物中两组分的最佳比例以及最佳比例的剂量反应进行了测定.当AB间的比例为55时可产生最大的EAG反应,其它比例(91、73、37、19)间无明显差异.AB(55)混合物的使用剂量在0,04～4μg范围内,EAG值随剂量增加呈直线上升;使用剂量低于0.04μg或高于40μg,EAG值不再有明显变化.     

棉花γ辐射诱变后代M5农艺经济性状的遗传变异

利用250Gy的Co60γ射线对棉花3个品种的干种子进行辐射处理,对其M5农艺经济性状的遗传变异进行分析。结果表明:3个品种的M5群体的铃重、单株铃数、株高、果枝数和麦克隆值的平均变异系数均超过10.0%以上,3个品种的辐射诱变后代M5群体表型性状变异系数存在明显差异;3个品种的M5群体的铃重与2.5%跨长和比强度均呈显著或极显著正相关,在其它性状间的相关性上3个品种的M5群体间存在较大差异;3个品种的M5群体的2.5%跨长均为第一主成分的主要因子。这阐明了辐射对不同棉花品种的诱变效果存在差异,揭示了辐射创造了丰富的遗传变异。     

施肥对不同品种麦田CO2通量的影响

为探讨施肥对小麦田间CO2释放量的影响,本研究设计以4个不同施肥水平为主处理,以3个不同年代的主栽品种碧玛1号、烟农15号、山农11号为研究对象,采用封闭式静态暗箱技术,应用LI-6400型便携式光合仪(美国)在作物生长期测定土壤CO2释放量和光合速率。同时测定了环境影响因素土壤温度和水分等。研究结果表明,施肥有利于增加土壤CO2释放量,且中氮处理水平释放量最多;土壤温度和水分对土壤CO2释放量有一定的影响,土温越高,水分越大,CO2释放越多;麦田CO2交换量与小麦根系活性呈正相关。     

Stability Analysis on Excavated High Slope of Mozong River Power Station in Wulong

The subject matter of this paper is to analyze the stability of excavated high slope. On the base of typical engineering case in Wulong, Chongqing, the geological conditions and potential failure pattern of the high slope are discussed. Then, the limit equilibrium method and the stereographic projection method are used to synthetically analyze the stability of excavated high slope. As a result, it indicates that the stability of the high slope in insufficient and some retaining structures ought to be adopted for the high slope as soon as possible.     

Digital Beamforming for Unified Spread Spectrum TT&C System

In TT&C system,unified spread spectrum framework and adaptive antenna digital beamforming technologies are used to track, telemetry and command objects. Constant modulus array (CMA) and adaptive signal canceller estimate the direction of arrival (DOA) of every signal and use the optimum weighted vector to form the beams. The phase weighted vectors estimated from DOA improve the processing gain as well as being utilized in the transmitting of tele command signal to form the beam of specified object. Its processing performance is researched and simulated in this paper.     

Soft-switching Analysis Phase-Shifted-FB-ZVS-PWM DC-DC Converter With Saturable Inductor

Compared with the traditional full-bridge(FB)zero-voltage-switched(ZVS) pulsewidth-modulated(PWM) converter, the FB-ZVS-PWM converter with a saturable inductor has a wider load range with ZVS and smaller circulating energy as well as smaller duty cycle loss. By analyzing the operation principle of the converter, this paper studies design considerations of the parameter bringing about ZVS and dead time of the switch, and gives out the design method, finally simulation testing has been carried out.     

Harmonic Analysis and Suppression of High-frequency Welding Devices

This paper analyzes the structure and line current waveform of 3-phase AC voltage regulation circuit. As an application of 3-phase AC voltage regulation circuit, a high-frequency welding device's simulation model and harmonic analysis of line current are presented. Results of simulation are compared to field measurements. The two are in a good agreement, so this simulation model is correct. Two single-tuning filters and one second-order HPF are designed according to the device's harmonic condition. Simulation results of the circuit with filters indicate decrease of the harmonics in current of power supply, and the waveform is close to sinusoidal wave, which prove correctness of the solution to harmonics pollution.     

Nonlinearity of Electronic Throttle and Its Control

This paper introduces the development of the electronic throttle control system (ETCS) , the structure and the principle of the system are also involved. After analyzing the nonlinearity problem existing in the mechanical structure of the system, a mathematical model of the ETCS is built up. Then three controllers (PID controller, Fuzzy controller, sliding mode controller) were designed and simulated in the matlab simulink. The result indicates that the PID controller has an overshoot,but the Fuzzy controller and the sliding mode controller can settle the nonlinearity problem better.