These researches provide us a basis for forecasting the pests in grain in earlier stage , accurately utilizing pesticides , improving the efficiency of prevention and reducing the loss of stored grain . the sound absorption properties of various types and thickness of grain are measured by means of the standing wave tube technique . the following conclusions can be drawn : for the same thickness the larger grains has a smaller sound absorption coefficient than the smaller grains 为了有效地研究储粮害虫所产生声信号在各种粮食中的传播特性，本文采用驻波管法，对十一种不同种类粮食在不同堆积厚度情况下的吸声性能进行了实验研究，粮食吸声特性与其颗粒的大小、形状、排列方式及粮食堆积厚度等有关，存在一定的规律，得出如下结论：同一厚度下，颗粒大的粮食较颗粒小的吸声性能差，颗粒由大到小，吸声系数峰值频率向低频方向移动；球形颗粒粮食较长形颗粒吸声性能差。
The investigation receives 4702 data . some conclusions have been based on the questionnaire . i . among these factors , the block of farmer plays the greatest role , followed successively by the block of agricultural scientific research fund , the block of agricultural technicians , the block of agricultural technology extension system , the block of macro stimulated system , the block of agricultural sci - tech achievements , the block of agricultural technology extension fund and the block of agricultural scientific research institution 调查共获得4702条数据，通过对这些数据进行分析，得出如下基本结论： 1 、各障碍因子对农业科技成果产业化影响程度，按由大到小顺序排列依次为：农民方面障碍农业科研经费障碍农业科研人员障碍农业技术推广体系障碍政府宏观调控机制障碍农业科技成果障碍农业科技推广经费障碍农业科研机构设置障碍。
Among obstructive sub - factors about agricultural technology extension fund , what agricultural technology extension business fund is n ' t enough plays the greatest role , followed successively by what mangement earning is n ' t enough , what special outlay has n ' t stead source , what agricultural technology extension fund is n ' t run well . ix . among obstructive sub - factors about the agricultural scientific research institution , what 9 、农业科研机构设置子障碍因子，按影响程度由大到小依次排序为：农业科研单位开发机构薄弱科研单位综合科研能力不强农业科研机构专业设置老化农业基础研究、应用研究、开发研究比例不协调。
Among obstructive sub - factors about the agricultural scientific research fluid , what agricultural sci - tech business fund is n ' t enough plays the greatest role , followed successively by what agricultural scientific research exploitation earning is n ' t enough , that is difficult to receive the program ' s outlay , what the program ' s outlay is n ' t run well 3 、农业科研经费的子障碍因子，按影响程度由大到小依次排序为：农业科研事业费不足农业科研开发收入少争取不到科研课题经费农业科研经费管理不善。
Separate assessment of small - , medium - and large - sized cells showed that as the cell size decreased from large to small , percentages of cycling cells , starved cells and confluent cells in g0 + g1 and g0 alone increased remarkably , percentages of aphidicolin treatment cells in g0 increased obviously 对于小的，中等的，大的细胞分别检测时发现随着细胞体积的由大到小，正常对照组、饥饿处理组及汇合处理组的细胞处于g0期及g0期+ g1期的百分率显著升高，艾菲地可宁处理组细胞处于g0期的百分率明显升高。
The study results indicated that , arranged in the order of magnitude , the degrees of the effects on the cementing strengths of the two interfaces were the system , emulsion , main emulsifier , fluid loss control agent and white oil respectively ; the cementing strength would be doubled and redoubled after being cleaned by preflush , especially by the system , emulsion and fluid loss control agent ; and , along with the increase in the mix slurry ratio , the initial and final set times of slurry would be obviously lengthened and the compressive strength of bond cement would be remarkably reduced or the slurry wouldn ' t be even set 研究表明：对两界面胶结强度的影响由大到小依次是体系、乳状液、主乳化剂、降滤失剂、白油；前置液清洗后，胶结强度成倍提高，尤其对体系、乳状液和降滤失剂清洗效果最佳；随混浆比的增大，水泥浆初凝和终凝时间明显延长，水泥石抗压强度明显下降，甚至不凝。
Thirdly , the valence electron structure of ceramic multiphase in ti ( c , n ) based cermets were calculated by eet theory , the results showed that na increased with additions of carbides , the order was vc > mo2c > nbc > wc > tac . based on the valence electron structure , the relationship between composition and wettability was set up through multiple linear and polynomial regressions 最后通过eet理论计算了多元陶瓷相价电子结构，结果表明，添加不同碳化物均能导致n _ a增加，对价电子n _ a增加的效果由大到小依次为vc mo _ 2c nbc wc tac ；以价电子结构为桥梁，通过多元线性回归及多项式回归建立了成份与润湿性的关系。
Among obstructive sub - factors about agricultural technicians , what go - aheadism of agricultural technicians is poor plays the greatest role , followed successively by what condition of work is n ' t well , what the thought of agricultural technicians has some obstacle , what diathesis of agricultural technicians is n ' t high 4 、农业科研人员的子障碍因子，按影响程度由大到小依次排序为：农业科研人员工作主动性差农业科研人员工作条件差农业科研人员的思想障碍农业科研人员素质低。
