红锥3向弹性常数研究

通过实验获得红锥的3向（纵向、弦向、径向）弹性模量和3向泊松比,以掌握红锥的弹性形变特性,为进一步研究红锥的物理力学性质及为木结构设计提供依据。以电阻应变片为变形传感器,采用单轴压缩并通过电阻应变仪进行应变测量,由材料力学方法获得红锥的3向弹性模量和3向泊松比。实验结果表明,红锥在3个主方向的弹性模量分别为EL=9352 MPa、ET=573 MPa、ER=1727 MPa,3个主方向上的泊松比分别为μLT=0.616、μLR=0.457、μTL=0.038,μTR=0.282、μRT=0.785、μRL=0.067。红锥的弹性模量纵向（L向）最大,径向（R向）次之,弦向（T向）最小,泊松比则弦向最大,径向次之,纵向最小。     

辽宁省不同地区水稻减氮稳产肥密结构研究

为探讨辽宁省不同施肥水平地区水稻减氮稳产的可能性,设置不同肥密处理,研究了大田机插秧条件下肥密结构对不同地区主栽水稻品种产量的影响。试验结果表明,不同地区减少10%氮肥用量和常规氮肥用量处理间水稻产量没有显著差异,适当增加移栽密度是减氮稳产的有效途径之一。海城试验点盐丰47移栽密度以24万穴/hm ²较为合适,有效穗数达到400万穗/hm ²时,相对产量平均为104%。辽中试验点辽粳401移栽密度也以24万穴/hm ²较为合适,有效穗数约370万穗/hm ²时,相对产量平均为105%。庄河试验点辽粳401在常规施氮水平下33万和24万穴/hm ² 2个密度处理,以及减氮10%施氮水平下33万穴/hm ²密度处理产量较高,相对产量均达到110%以上。     

Time Effect Experimental Analysis of the Soil Arch Effect of Anti sliding Pile

Soil arching effect is important for stabilizing the soil behind anti sliding pile. The creep of soil mass will inevitably lead to the formation of soil arching, which has time effect. In this analysis, an indoor thrust pile model test is proposed. The characteristics of stress distribution in the soil and the time effect of soil arching behind anti sliding pile are analyzed. The experimental data acquired by the soil pressure cells arranged along the normal direction of the thrust show that soil arching effect is enhanced with the increase of thrust.The thickness of soil arch increases with time.And the data obtained by soil pressure cells arranged along the direction of the thrust show that the horizontal soil arching effect increases and then gradually extends.The scope of stress dispersion has very large growth along the normal direction as time goes on.     

车辆倾翻试验台的设计与应用

介绍了机动车倾翻试验的必要性,并对新开发的车辆倾翻试验台进行阐述,提出了一种新型的测量机动车倾翻稳定角的方法。     

民勤荒漠植物非称量蒸渗仪试验系统研发与应用

基于民勤荒漠植物非称量蒸渗仪试验系统研发过程,对民勤不同监测时段的非称量蒸渗仪结构设置、试验监测及其监测结果应用情况进行对比分析。结果表明:民勤非称量蒸渗仪试验研究起步较早,先后经历了5代非称量蒸渗仪试验系统的研发改造过程。第1、2、3代非称量蒸渗仪试验系统的建立,使民勤荒漠植物蒸渗试验得到逐步发展与完善;第4代荒漠植物非称量蒸渗仪试验系统增设了渗漏监测,模拟了荒漠植物真实的补水状态,设计出不同地下水恒位补偿式蒸渗仪和渗漏型蒸渗仪,实现了地下补水与地面灌水试验的同步监测;第5代荒漠植物非称量蒸渗仪试验系统通过扩容改造,实现了荒漠植物林木与林分尺度蒸渗试验的同步监测,并基于电子传感技术实现蒸渗监测自动化管理,为尺度水平荒漠植物蒸散耗水研究及其监测数据的网络资源共享提供保障。     

温度及赤霉素对托鲁巴姆种子发芽的影响

为研究托鲁巴姆的发芽特性,确定生产中高效简便的催芽方法,对2012—2014年采收的托鲁巴姆种子进行变温、恒温催芽试验,同时探讨了赤霉素(GA_3)浸种处理对发芽的影响。结果表明:30℃16 h/20℃8 h为最适变温处理,在此条件下,发芽高峰期在催芽开始后的7~13天,200 mg/L浓度的GA_3浸种能加快贮存1年以上的种子萌发;清水浸种恒温催芽不利于托鲁巴姆种子的发芽,但采用600~1000 mg/L的GA_3浸种24 h后恒温催芽,可使发芽高峰期集中在催芽开始后的7~10天,并达到90%以上的发芽率,600 mg/L GA_3浸种为恒温催芽条件下的最适宜处理浓度。综合分析认为:托鲁巴姆种子采用清水浸种,30℃16 h/20℃8 h变温催芽,即可满足托鲁巴姆砧木种苗的生产性需求,对采收1年以上的种子可用200 mg/L GA_330℃浸种24 h后变温催芽加速其发芽;如采用恒温催芽,可用600 mg/L的GA_3浸种24 h后催芽。虽然600~1000 mg/L GA_3浸种恒温催芽能使托鲁巴姆种子较变温处理清水浸种更快发芽,但考虑到GA_3品质及配制问题,生产上应提倡200 mg/L GA_3浸种处理加30℃16 h/20℃8 h变温催芽。     

高产稳产小麦新品种‘淮麦33’选育及性状分析

为选育适于江苏淮北地区种植的高产稳产小麦新品种,江苏徐淮地区淮阴农业科学研究所2001年以‘烟农19’和‘郑州991’进行杂交,用系谱法选育出小麦新品种‘淮麦33’,2013年通过江苏省审定(苏审麦201305),2014年通过国家审定(国审麦2014001)。参加江苏省区域试验结果:2010—2012年江苏省淮北区域试验,平均产量7977.90 kg/hm2,较对照‘淮麦20’增产6.28%;2012—2013年江苏省生产试验,平均产量7948.95 kg/hm2,比对照‘淮麦20’增产5.96%,居参试品种第1位。参加国家区域试验结果:2011—2013年国家区域试验,平均产量7563.30 kg/hm2,比对照‘周麦18’增产6.83%,增产差异极显著,增产点率94.10%,均值变异系数10.11%,适应度82.34%。2013—2014年国家生产试验,平均产量8934.00 kg/hm2,比对照增产6.13%,居该组试验品种第1位,增产点率100%。通过多年多点区域试验表明:‘淮麦33’株型理想、产量潜力高,对黄淮麦区小麦主要病害、逆害具有良好的抗(耐)性,尤其是2010年、2012年赤霉病大发生、2013年倒春寒严重发生的情况下,稳产性突出。     

红碎茶的静电特性

本文介绍了红碎茶静电特性的试验方法,分析了红碎茶和茶梗的含水率、粒度、电场强度对红碎茶带电性能的影响;红碎茶的含水率、测试层厚度、测试信号频率对红碎茶电传导和介电特性的影响。     

Extensional Flow Studies of Wheat Flour Dough. II. Experimental Method for Measurements in Constant Extension Rate Squeezing Flow and Application to Flours Varying in Breadmaking Performance

An experimental method for biaxial extensional measurements on wheat flour doughs in a squeezing flow geometry is reported, in which the speed is controlled so as to be proportional to the gap between the disks, resulting in a constant extensional strain rate in the sample. In such measurements, the stress was obtained directly as a function of Hencky strain at constant pre-set strain rate. This allowed a straightforward evaluation of the strain hardening phenomenon, its onset and strength. Measurements were made at three strain rates and at Hencky strains varying from 0 to 3 for 15 winter wheat cultivars, five of high (H), five of intermediate (M) and five of low (L) protein content and baking performance. It was concluded that all three groups showed strain hardening, which started before a Hencky strain value of 1 was reached. All three groups, at all three strain rates satisfied the stability criterion n>_Hat all values of Hencky strain (n is the strain hardening index in the power-law representation σ=K_Hⁿwhere σ is the stress, _His the Hencky strain, and K is a constant). Differences between the groups were seen most clearly at the lowest strain rate: (i) the onset occurred at a lower Hencky strain, the higher the protein content and baking quality; (ii) the strain hardening index reached a maximum just before a Hencky strain of 2, where the H group had a 25% higher value than the M and L groups.     

Gonadotropic hormone (GtH) receptors in the testis of the troutSalmo gairdneri: in vitro studies

A particulate fraction obtained from trout testis at the time of spermiation shows saturable binding sites for¹²⁵I-labeled salmon gonadotropin (¹²⁵I-GtH). Non-gonadal tissues (liver, muscle and spleen) did not demonstrate specific¹²⁵I-GtH binding. The tracer's specific activity was determined by the self-displacement method (18 to 30 Ci/g). Maximal specific binding ability of¹²⁵I-GtH varied from 20 to 30% of the labelled ligand added, depending on the hormone preparation. Specific binding of¹²⁵I-GtH to 20 mg of the testis membrane varied from 40 to 85% of the total binding depending on the method of membrane prepratation, and was competitively inhibited by concentrations of unlabelled GtH ranging from ca 1 to 1000 ng/ml of incubate. Gonadotropin of mammalian origin, ovine TSH or salmon prolactin competed only weakly, or not at all, for testicular gonadotropin binding sites (relative potencies s-GtH>>FSH=hCG>s-PRL>bTSH). Scatchard analysis of equilibrium binding studies shows that saturable gonadotropin binding was due to a class of high affinity binding sites (sites I Ka3×10¹⁰ M^–1) and possibly to a second class of lower affinity binding sites (sites II Ka=5 to 14×10⁸ M^–1). The binding capacity of sites I, as measured in enriched membrane preparations, was 45±18 fmoles/g of testis during the period of spermiation. The concentration of GtH required to obtain half maximal displacement of¹²⁵I-GtH in the binding studies was of the same order of magnitude as the apparent ED50 for GtH stimulation of 11-Cetotestosterone (11KT) secretion by trout testesin vitro. Mammalian LH and FSH were 100 to 1000 folds less potent than salmor GtH to increase 11 KT secretion.