稻谷热风辅助射频干燥工艺及相关品质研究

新型热风辅助射频(HA-RF)技术已被证实在稻谷杀虫方面具有良好的效果,为探究其同步杀虫干燥的应用潜力,本研究重在探究HA-RF在稻谷干燥方面的效能,开发稻谷HA-RF干燥工艺并研究相关的品质变化.结果表明:极板间距为10.0 cm(射频加热速率6.10℃/min),干燥温度为60℃,样品厚度为3.0 cm时,稻谷HA-RF干燥效能最佳;HA-RF与热风(HA)干燥相比可缩短干燥时间34.6％,单位能耗也更低.此外,HA-RF与HA干燥相比对稻谷精米率、整精米率和爆腰率的影响无显著差异,但HA-RF干燥可以更好地保留维生素E,且对样品颜色和微观结构的影响也较小.该研究表明HA-RF是一种比HA干燥更加高效节能的技术,且干燥后稻谷品质更好,在稻谷同步干燥杀虫上具有一定应用潜力.     

锤片式粉碎机减振装置的改进

针对生产中使用的SFSP137×76型号锤片式粉碎机的地脚螺栓发生断裂的情况,分析引起地脚螺栓发生断裂的原因,并据此提出解决方法,即通过改变粉碎机的减振装置以达到良好的减振效果,从而保证生产的正常运行.     

不同基因型抗虫棉的光合生产与叶源特征

以33B为对照,对早发型常规Bt棉鲁棉研17、鲁棉研21,晚发型Bt棉鲁棉研22,杂交Bt棉鲁棉研15、鲁棉研20进行了2年的种植和比较。早发型品种中前期干物质积累和叶面积增长快,但后期干物质积累慢、叶面积下降快,表现出明显的早发早熟和干旱年份易早衰的特点;晚发型品种前期干物质积累和叶面积增长慢,但后期增长快,表现出明显的晚发甚至贪青晚熟的特点。两个杂交棉品种表现出与早发型品种基本相同的生育规律,但中前期叶面积系数和干物质积累量显著高于其它供试品种。盛铃期以前,未见品种间功能叶光合速率的显著差异,但在干旱年份,早发型品种在始絮期功能叶的光合速率显著低于晚发型品种。早发型品种中后期的根冠比和功能叶含K量显著低于晚发型品种,而叶面积载荷量却显著高于晚发型品种。不同品种干物质产量和熟相的差异可能分别与叶面积系数大小和库源比例不同有关。     

Influence of Construction Defect on the Performance of Lining in Hydraulic Tunnels

In the construction of hydraulic tunnel, the engineering quality problem is often caused by concrete cracks and insufficient thickness of roof lining. This problem attracted great attention of the most engineers that whether the structure performance of this kind of lining can meet the design criteria or not, especially under unfavorable conditions. Based on the on site inspections of the lining defects in Baishanzui tunnels, the model and size of the defects are analyzed with FLAC program. The study shows that the defects have obvious adverse influence on the stability and safety of the tunnel lining, however, if a backfilling grouting is carried out and the cracks are repaired, the integrality of lining is restored, the behavior of lining will be improved and can meet the design criteria as well.      

Sludge Treatment and Application in Greening

Sludge is a very good fertilizer source and has higher value in use as nutrients for greening, whereas sludge also contains higher concentration of heavy metals, with which urban underground water would be suffered secondary pollution. A test of greening with sedium lineare and modified fly ash passivation sludge was carried out to study the impacts of different mixture ratio and dosage of modified fly ash on the plant’s growth and leachate. It was shown that 20% mixture ratio of modified fly ash was the optimum for sludge treatment and 80% of heavy metals pollution can be removed.     

Energy delivery model for implanted devices

FEMlab3.3(Finite Element Model Lab) is used to develop an energy delivery model for implanted devices. We designed three different shape electrodes made of Ag to enhance current transmitting efficiency. Several voltages were used for pursuing perfect goal. With the body safety current, we can get the results with a current transmitting efficiency of 20% and the energy delivery efficiency of 4%~9%. It is clear that the high energy delivery efficiency can be obtained and the results provide references for further study of energy delivery through body conduction.     

Statistical characteristics analysis of partial discharge in high voltage cable joint

Four typical physical models for the internal insulation defects of 110kV cable joint are designed, while the test platform for Partial Discharges (PD) research on cable joint is constructed. A large number of PD data under different models are obtained by inner broadband ring sensor. The statistical analysis on the PD pattern indicates that there are significant differences between four PD forms on the statistical characteristics such as the phase distribution, skewness, kurtosis and degree of asymmetry, which can be used as effective features to reflect different characteristics of PD. Surface discharge and conductive particles may cause more serious damage to the insulation performance of cable joint, so high precaution should be paid on site operation.     

Design and fabrication of a novel resonator for resonant accelerometer

A novel resonator for accelerometer with sensing and actuating combs was designed and fabricated based on micro electromechanical system (MEMS) process. Driving force and demand voltage of the resonator were analyzed by analytical method and Finite Element Method (FEM). Sensing capacitance on resonance state and Q factor under atmosphere was calculated by these two methods. The micro fabrication process was planned and realized using MEMS (Micro electromechanical System) method. The testing results show the performance of the resonator is high; the natural frequency of the resonator is 54 523.5 Hz, which has the error of 13.6％ with the theorical value.     

Design of compatible processing and analyzing system for nuclear signals

To on line detect, store and process nuclear signals with multiple forms and multiple frequencies, a compatible processing and analyzing system for nuclear signals based on ultrahigh speed data acquisition card was constructed. When the source signal is at pulse form, the system records signal with the mode of time digital converting. When source signal is at continuous form, the system records signal with the mode of analog digital converting. The processing procedures and algorithms were designed for various signal forms. The results for nuclear random process such as correlation function and power spectrum were effectively obtained.     

Design of the Virtual Instrument of Frequency/Amplitude Sweep

In this paper the inevitable trend of constructing open ecosystem in modern settlement environment was discussed through the history of the settlement environment and the characters of modern settlement environment.The ecological crisis,change of the modern life and the citizens' needs and the ecological system character show,that it is important for sustainable development of the settlement environment to construct open ecosystem.The construction of modern habitation and the city room embodies the concept of open ecosystem.Then,in construction and research of modern settlement,the ecological viewpoint and method should be applied.