我国森林经营方案问题研究评述

回顾了森林经营方案编制的历史,较全面地阐述了森林经营方案在编制、实施与管理中存在的问题.指出了编制与实施森林经营方案在理论上与技术工作中需要进一步研究解决的问题.对森林经营方案编制的发展趋势进行了初步分析.     

厚层基材喷播技术在北方半干旱区岩石边坡植被恢复中的应用——以京承高速公路(三期)植被恢复工程为例

以京承高速公路(三期)岩石边坡植被恢复工程为例,研究厚层基材喷播技术的施工工艺及植被恢复效果,从抗旱乡土植物的筛选与配置、技术适宜性评价以及养护措施效果方面,综合分析归纳出厚层基材喷播技术,在北方半干旱地区岩石边坡植被恢复中的应用效果及关键技术,对于完善我国裸露边坡植被恢复理论体系,指导裸露坡面工程绿化,都具有非常重要价值。     

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.     

Phase Transformation Diffusion Bonding of Titanium Alloy to Stainless Steel

Jointing of titanium alloy and stainless steel is very often in the fields like aviation, chemical plants etc. The combination of materials has the advantages of both titanium alloy and stainless steel and will reduce the consumption of titanium resource. The phase transformation diffusion bonding of TA17 titanium alloy to 0CriSNigTi stainless steel are carried out on Gleeble - 1500D. The effcet of maximum thermal cycle temperature, the tensile strength, the fracture surface and microstruture of the joints are investigated. The results show that TiFe and TiFe2 intermetallics and some solid solutions are formed along the interface, when maximum thermal cycle temperature increase, the area proportion of intermetallics in the fracture surface increase, which are detrimental to the mechanical properties of the transition joints.     

杜仲雌花芽2个发育时期转录组分析

杜仲(Eucommia ulmoides)的果实是提取杜仲胶和杜仲籽油的重要原材料,在工业、医疗、食品等领域开发前景广阔。为了揭示雌蕊原基发育相关基因的表达情况,本研究以杜仲果用良种‘华仲6号’(Huazhong No.6)为材料,利用lllumina Hiseq X-10高通量测序平台,分别对花序原基分化期和雌蕊原基分化期的花芽进行转录组测序,通过生物信息学对2个发育时期的雌花芽转录组进行比较分析,筛选出与杜仲雌蕊原基发育相关的差异基因。结果显示,转录组测序共获得68.11 Gb数据,各样品的Clean reads与杜仲基因组进行序列比对,比对效率为91.59%~92.05%,同时2个发育时期共筛选出485个差异表达基因,其中219个差异基因在雌蕊原基分化期表达上调,266个表达下调。差异基因GO富集结果表明,花的发育、光周期现象、激素生物合成以及蛋白结合转录因子活性等相关的生物途径被富集。KEGG富集结果表明淀粉和蔗糖代谢、碳代谢、昼夜节律和植物激素信号转导等代谢通路被富集。结果表明光周期途径是诱导杜仲成花的重要途径,且雌蕊原基发育受碳水化合物、植物激素和其他代谢物质调控。本研究为杜仲花器官发育调控基因的挖掘提供了基础数据,也为果用杜仲的分子育种提供了参考。     

棉花黄萎病菌鉴定技术进展

黄萎病作为一种危害严重的世界性病害，如何快速有效地鉴定黄萎病菌已成为当今学术界普遍关心的问题。本文综述国内外有关黄萎病菌鉴定技术的发展动态，旨在为从事棉花黄萎病研究的科学工作者提供可资借鉴的研究信息     

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.     

High speed, high precision digital phase sensitive detector design for electrical impedance tomography

Electrical impedance tomography (EIT) system must have the properties of high precision and speed, thus the digital phase sensitive detector (DPSD) based on the field programmable gate array(FPGA) is developed for data collection of EIT. Based on the principle of DPSD, the relationship between signal to noise ratio (SNR) and sample resolution as well as total number of samples is deduced. An implementation scheme of this system and a method of designing analog to digital converter (ADC) clock based on direct digital synthesis (DDS) technology are provided. The system adopts high speed multi channel ADC and low jitter clock conditioner for ADC. Real time DPSD is implemented with FPGA. The experiments show that the measurement accuracy reaches 0.03% and the SNR reaches 85 dB. The agar phantom experiments prove that the performance of the DPSD meet the designing requirement for EIT.     

Experimental research on heating performance of jetting mixing low pressure heaters

This paper conducts the experimental study on the performance of steam water two phase flow device composed by a nozzle,mixing chamber and the corresponding valves when the inlet steam pressure is in the range of 0.18~0.22 MPa．The experimental results show that the injector can run stably and reliably and the temperature of outlet water is increased obviously in low inlet steam pressure．This characteristics can be used as effective heaters in the engineering fields such as power plants,heating,the light industry, etc． When a single stage ejector can not meet the requirements of heating conditions, double stage ejectors can be used.