Effect of Pesticides On Certain Soil Biological and Biochemical Indices of a Paddy Soil

A 21-day laboratory incubation experiment was conducted to investigate the impact of pesticides (Triazophos, Butaehlor and Jinggangmycin) on a paddy field soil health under controlled moisture (flooded soil) and temperature (25℃ ) conditions. The electron transport system (ETS)/dehydrogenase activity displayed a negative correlation with pesticides concentrations, and the activity was affected adversely as the concentration of the pesticides increased. The higher doses of pesticides,5 and 10 folds field rates, significantly inhibited ETS activity, while lower rates failed to produce any significant reducing effect against the control. The relative toxicity level of pesticides in decreasing the ETS activity was in the following order:Triazophos＞Jinggangmycin＞Butachlor, irrespective of their rates of application. The pesticides caused an improvement in the soil phenol content and it increased with increasing the concentration of agrochemicals. The pesticide incorporation did not produce any significant change in soil protein content. The response of biomass phospholipid content was nearly similar to ETS activity. The phospholipid content was decreased with the addition of pesticides in the given order of Triazophos＞Jinggangmycin＞Butachlor; and the toxicity was in the order: 10 FR (times of field rate)＞5 FR＞1.0 FR＞0.5 FR＞control.     

我国农用运输车的现状与前景浅析

就我国农用运输车的现状进行了分析并提出建议     

Analysis on Optimal Service Frequency of Public Transport Considered with Generalised Cost

The service frequency is an important factor which shows the supply and service level of public transportion. By considering the effect of occupancy rate on generalised cost firstly, the authors establish a new public transport model based on generalised cost. Then from the view of optimal pricing, this paper constructs two optimal service frequency models by the aim of maximizing social welfare and maximizing profit separately. The result shows that, without the effect of externalities, the two optimal service frequency is the same. Finally, this paper use some parameters of generalised cost, which coming from a city, to simulate this model, and the result shows it is feasible.     

Application of Piping Transport System in Solid Matter Transport

Piping transport system is a developing technology with wider prospects, which has been applied extensively abroad; it is still in embryo in China. The piping transport system is adopted in refining phosphorite transportation#of Guizhou Wengfu phosphorite mine, which is depigned by PSI Corporation. In this paper, the comparison of transportation systems, piping transport system design and the essentials in solid matter transport with piping system is discussed systematically.     

Improved Techniques for Haploid Production in Wheat using Chromosome Elimination

Wheat × maize and wheat × pearl millet crosses have proved efficient for haploid production using various genotypes of wheat; 22 and 27 % of florets produced embryos. In favourable conditions 6—9 haploid plants per spike were produced. The following simplifications or improvements in technique are recommended: 1. Only a single treatment with an aqueous solution of dicamba or 2,4-D (50–100 ppm) for embryo stimulation in vivo; 2. Application by spraying or dipping the spikes; 3. Application time two to four days after pollination; 4. Embryo rescue 15 to 18 days after pollination; 5. Crosses without emasculation are possible if pollination occurs 1–2 days before anthesis. More than 450 haploids and some doubled haploid (DH) lines (after colchicine treatment in vitro) were produced using these methods. No hybrid plants, chromosome additions or substitutions were found.     

Broadband Data Push-casting Technology and the Composition of the Transport Stream Based on Software

Digitalization of TV program becomes the trend. It is possible to provide broadband data service through DVB. The specifications about data broadcast of DVB are outlined in this paper. A detailed theoretical analysis is made on data carousels applied to data push-casting, and the software flow chart of the composition of MPEG-2 transport stream is also given. Data push-casting can provide better service than Internet for the local subscribers, and it is a good method to resolve the problems such as high cost, low speed of accessing Internet, and great investment of reforming HFC networks.     

马尾松PmTIR1基因的克隆及编码蛋白质的结构预测

TIR1(transport inhibitor response 1)基因在生长素信号转导途径中发挥重要作用。本研究采用PCR技术和RACE技术,利用Primer Premier5进行引物设计,从马尾松中克隆出TIR1基因的全长c DNA序列,命名为Pm TIR1。此c DNA全长2 446 bp,包括1 725 bp完整的ORF,能够编码含有574个氨基酸的蛋白,此蛋白相对分子质量为64 240.3 u,等电点为6.76。利用Clustal X、ANTHEPROT和DNAMAN等软件分析Pm TIR1序列及其编码的氨基酸序列,结果表明:马尾松Pm TIR1蛋白氨基酸序列与火距松TIR1蛋白同源性高达99%,Pm TIR1蛋白含有F-box结构域和多个LRR结构域;Pm TIR1蛋白的F-box结构域可能与SCFTIR1中SKP1结合,它符合F-box家族的特点。利用实时定量技术得知Pm TIR1在马尾松嫩根、嫩茎、嫩叶中都有表达,在嫩叶中表达量最高、嫩根中次之、嫩茎中最低。本研究可为生长素调控马尾松生长发育相关机理提供理论依据。     

Discussion on 2-D Math Model of Sediment in Gravel Dominantly Riverbed

The present paper gives a discussion about transport coefficient of suspended sediment, coefficient of saturation recovery, riverbed sediment grading, deposition/scour thickness and normalization of the sediment composition in gravel dominantly riverbed. The math model above mentioned has been tested in two rivers with different riverbed sediment composition and a rather good agreement has been obtained.     

农用车制动称重复合检测试验台的研制

研究开发了一种用于农用车性能检测的新型制动称重复合检测试验台。该设备通过顺序动作完成轴荷称重和制动力的检测，由计算机对力传感器信号进行采集处理，能同时测量左右轮的轴荷和制动力。实际使用结果表明，能满足农用车的制动力台试检测的要求，并具有性能可靠、精度较高和易维护等优点。     

在用汽车排放污染物检测仪器分析

结合怠速工况、简易工况法分析了汽车排放污染物检测仪器的结构原理。废气分析仪采用不分光红外吸收型对HC,CO和CO2进行测量,采用电化学传感器对NOX和O2测量,能较好地满足GB18285-2005标准的双怠速和简易稳态工况法的检测要求。汽车排放总质量的测量是在废气分析仪的基础上,增加了稀释的排气流量测量装置,测取的流量值、污染物气体成分的含量值;经计算机处理计算,以排放因子的形式显示,能够满足GB18285-2005标准的简易瞬态工况法和简易稳态工况法的检测要求。