Experimental Study on the Beam Bars Detail in Exterior Short Pier Shear Wall Joints

By experiment of the beam bars in exterior short pier shear wall joints,the anchorage performance of the beam bars in joints on the action of low cyclic load have been studied to attest if the beam bars in exterior short pier shear wall joints can sufficed with the demanding of anchorage intensity and anchorage rigidity, when the anchorage of beam bars satisfy the requirement of the code.     

Cold acclimation of winter and spring peas: carbon partitioning as affected by light intensity

Like most plants, pea (Pisum sativum L.) becomes tolerant to frost if it is first exposed to low non-freezing temperatures, a process known as cold acclimation. Cold acclimation is a complex process involving many physiological and metabolic changes. Two spring dry peas, two winter dry peas and one winter forage line were exposed to cold temperature in a controlled environment in two experiments, one using low light intensity and the other regular light intensity. Plants were harvested throughout the experiment and dry matter accumulation, water content, soluble and insoluble sugar concentrations were determined from shoot and root samples. Cold acclimation did not occur when temperatures were low if light intensity was low, even in winter peas. In contrast, with regular light intensity, the winter peas acquired more freezing tolerance than spring peas and a close relationship was found between the soluble sugar concentration of leaves just before the frost and the degree of freezing tolerance obtained by the different genotypes. Relationships between freezing tolerance and carbon partitioning between shoot and roots are discussed.     

愈合期不同光照强度对黄瓜嫁接苗的影响

研究愈合期不同光照强度对黄瓜嫁接苗定植前质量的影响,旨在为黄瓜嫁接愈合光照的精确化调控提供参考依据。试验将嫁接愈合分为1~3 d、4~6 d、7~10 d 3个时段,分别给予6种不同光照强度梯度处理。结果表明,愈合期在45-90-135μmol·m^-2·s^-1的光照强度梯度下嫁接苗地上部与地下部形态生长显著提升,形态综合指标最佳,较传统愈合条件(0-30-45μmol·m^-2·s^-1)下可溶性糖与可溶性蛋白含量分别提升了65.87%、15.85%,叶绿素荧光参数也表现最优。综合分析表明,45-90-135μmol·m^-2·s^-1的光照强度梯度最有利于黄瓜嫁接苗生长,最有利于嫁接苗可溶性糖和可溶性蛋白的积累,且叶片的光合电子传递效率、光合效率和自我保护调节机制较好,可作为黄瓜嫁接愈合期的光照强度条件,这为提升黄瓜嫁接苗的商品质量提供了一些理论依据。     

不同光照条件下番茄主要性状的变化及相关分析

耐弱光性不同的番茄品种（品系）对光照条件反应不同，确定番茄耐弱光鉴定指标，可以快速有效地从大量种质资源中筛选耐弱光的番茄品种，提高品种耐弱光选择效率；试验对耐弱光性不同的4份番茄品种（品系）于定植后进行遮光处理，分别研究各品种在不同光照下的光合特性、经济性状的变化，并对11个性状进行相关及通径分析。试验结果表明，在透光率为25%（平均光照强度的光通量约为230μmol/）的光照条件下，净光合速率、气孔导度、蒸腾速率、坐果率、单果重、单株产量均有不同程度的下降，且弱光下坐果率、弱光下净光合速率、弱光下胞间CO2浓度与相对单株产量直接通径系数分别为1.92、1.76、2.13，相关系数分别为0.53、-0.09、0.48。可见，弱光下的坐果率是鉴定番茄耐弱光性的可靠指标，弱光下净光合速率和胞间CO2浓度可作为耐弱光性鉴定的重要辅助指标。     

Identification of Minibus''s Surface Noise Source

With the study of minbus's accelerated exterior noise control,the principle of sound intensity measurement was applied,the sound intensity of a minbus's surface noise was tested,and the surface noise distribution was presented.Several identification of noise source methods including sound power,sound intensity contour map,frequency spectrum were used together for surface noise analysis and study.Engine radiation noise and exhaust noise was identified as the major noise sources.On the contrary,car body vibration noise,tyre noise,transmission agent noise,air admission noise just occupied a little proportion of surface sound radiation energy.The research provides the reliable basis to determine main projects of minibus's accelerated exterior noise control.     

Biodegradation of Linear Alkyl Benzene Sulphonate

The paper researches on the degradation of LAS (Linear Alkyl benzene Sulphonate) by combining AS1.860 immobilized with low intensity ultrasonic irradiation. The paper also discusses the influence of pH, rotary velocity, LAS concentration and the condition of low intensity ultrasonic irradiation on the degradation of LAS, the degradation rate of LAS is the main index of our experiment, the results of orthogonal test shows that low ultrasonic irradiation can increase the metabolizing of microorganism cells and facilitate the biodegradation of immobilized cells to LAS, here we research the degradation condition of 50mg/L LAS simulation wastewater with low ultrasonic irradiation, and the results show that the influence is obvious, the optimization degradation rate is about 83%, nine point five percent higher than that of the immobilized cells without ultrasonic irradiation.     

呼伦贝尔地区不同土地利用下土壤蒸发野外试验研究

土壤蒸发是水文过程的关键环节之一,控制着水分由土壤环境向大气环境的扩散。通过在呼伦贝尔地区典型草地与林地设置相同口径不同深度微型蒸发仪(Micro-Lysimeter,简称ML)的对比,寻求适合林地草地使用的微型蒸发仪,并研究不同土地利用方式对土壤蒸发的影响,探讨环境因素对土壤蒸发结果的影响。结果表明:土壤蒸发量随ML长度的增加先增大后减小,相同直径长度不同ML的蒸发量在0.05水平下显著相关,测定林地的蒸发量小于草地蒸发量,不封底ML所测定结果比封底ML大,其结果更接近真实情况,测量呼伦贝尔地区土壤蒸发时,亦采用15cm的不封底ML,结果较好。     

不同时间尺度下温室无土栽培番茄蒸散规律研究

采用试验测量法,以温室环境参数为变量,建立了不同时间尺度下番茄蒸腾量和椰糠水分蒸发量回归模型以分析温室无土栽培番茄蒸腾规律和椰糠水分蒸发规律。结果表明,1h、1d时间尺度下番茄蒸腾量回归模型的决定系数分别为0.673 8、0.801;68d(整个试验周期)时间尺度下,1号番茄累积蒸腾量与累积有效积温、累积辐射积的拟合决定系数分别为0.998 4、0.993 6。1d时间尺度下,椰糠水分蒸发量特性方程的回归系数为0.891;58d(整个试验周期)时间尺度下,椰糠累积水分蒸发量与累积有效积温和累积辐热积回归方程的决定系数分别为0.999和0.992 7。随着时间尺度增大,番茄蒸腾量和椰糠水分蒸发量与环境参数的相关性显著提高。     

Replication in initial selection trials of clonally propagated crops

Summary A mathematical model was constructed to determine the theoretical effectiveness of selection under various protocols in initial trials of clonally propagated crops. Effectiveness was quantified as the proportion of top phenotypes selected that can also be expected to be the best genotypes in trial. In the absence of replication there is a non-linear increase in this proportion with increase in broad-sense heritability. The proportion of best genotypes included is reduced as the intensity of selection increases. Replication effectively raises broad-sense heritability. The resulting increases in selection effectiveness are quantified for three levels of single-plant heritability (0.1, 0.5 and 0.9) and three selection intensities (0.1, 0.01 and 0.001) using a model based on the Normal Distribution and in which it is assumed that the trial area increases in size in direct relation to the degree of replication.When the trial area is of fixed size, replication reduces the number of genotypes that can be tested and the effectiveness of selection is, therefore, calculated with regard to the initial population of genotypes which could have been tested in the absence of replication. This showed that replication has a marginal benefit only where very high selection intensities are applied to characters with very low heritabilities. In other cases, replication is not beneficial since increases in selection effectiveness fail to compensate for good genotypes left in the seed packet. This conclusion proved to be equally valid when genetic variation was non-Normally distributed. Any increase in trial area for initial selection is best employed by increasing the total number of genotypes and growing just one representative plant of each. These conclusions could be relevant in other circumstances such as the evaluation stage of the single-seed descent breeding method for sexually propagated crops.