稻谷仓壁材料摩擦系数的实验研究

利用土工合成材料综合测定仪测定了不同法向压应力（25 kPa、50 kPa、100kPa、150 kPa、200 kPa）下稻谷（水分含量为13.55%、15.14%、17.00%、19.19%w.b）与不同仓壁材料（不锈钢板、混凝土板、木板）的摩擦系数。结果表明：稻谷与不锈钢板摩擦系数较小,与混凝土板和木板的摩擦系数较大;随着法向压应力的增大,稻谷与各仓壁材料的摩擦系数均呈不同幅度的减小;随着水分的增大,稻谷与各仓壁材料的摩擦系数增大。根据实验结果,可拟合出摩擦系数与法向压应力、水分含量的关系方程。     

直剪法用于糙米内摩擦角的测定与研究

利用土工合成材料综合测定仪（直剪仪）,以水分含量14.57%的糙米为样品,测定了在不同的法向压应力、不同的剪切速率下糙米的剪切应力并计算出内摩擦角。实验结果表明：糙米的剪切应力随着法向压应力（25kPa～100kPa）的增大而增大;剪切速率（1.33mm/min～2.67mm/min）较低时糙米的内摩擦角随着法向压应力的增大而减小;随着剪切速率（1.33mm/min～5.20mm/min）的增大,糙米的内摩擦角减小。     

含水率对糙米内摩擦角影响的实验研究

利用土工合成材料综合测定仪,以江苏盐城产糙米为样品,测定了在不同法向压应力和不同含水率的条件下,糙米的剪切应力并计算出内摩擦角。实验结果表明:在剪切速率不变时,糙米的内摩擦角通常会随着法向压应力的增大而逐渐减小;当法向压应力较小(25kPa)时,糙米的内摩擦角会随着含水率的增加而逐渐增大。当法向压应力较高(75kPa～100kPa)时,随着含水率的增加,糙米的内摩擦角逐渐增大,达到某一峰值后,随着含水率的继续增加而逐渐降低。     

大豆堆压缩特性的实验研究

使用TSZ-6A型应变控制式三轴仪对不同围压(8kPa~200kPa)、不同含水率(9.8%、11%、13.5%、14.8%、15.8%w.b.)的黑龙江省大豆堆的体积变化和体变模量进行了测定,分析了围压与含水率对大豆堆体变模量的影响。体变模量随着围压(8kPa~200kPa)的增大而增大,大豆实验结果表明:对含水率为9.8%w.b~15.8%w.b、围压为8kPa~200kPa的大豆堆,其体变模量范围为227.94kPa~610.58kPa。相同含水率的大豆堆的体变模量随着围压(8kPa~200kPa)的增大而增大;同一围压下,大豆堆体变模量随着含水率(9.8%w.b~15.8%w.b)的增大而减小。     

大豆内摩擦角的测定与实验研究

利用剪切仪,测定了在不同的剪切速度、不同的法向压应力、不同的水分条件下大豆的内摩擦角。结果表明:随着剪切速率的增大(1.33～4.33 mm/min)大豆内摩擦角减小,随着法向压应力的增大(0.25×105～1.00×105Pa)大豆内摩擦角减小,随着水分含量的增大(12.11%～18.02%)大豆内摩擦角先增大后减小。     

稻谷堆弹性模量的实验测定与研究

利用TSZ-6A型应变控制式三轴仪进行三轴实验,测定围压分别为50 kPa、100 kPa、150 kPa、200 kPa时,稻谷堆（水分为11.89%w.b,13.55%w.b,15.73%w.b,17.62%w.b）的弹性模量,同时研究围压和水分与稻谷堆弹性模量的关系。实验结果表明：对于水分范围为11.89%~17.62%w.b的稻谷堆,在围压为50 kPa~200kPa的范围内,其弹性模量范围为8.69 MPa~37.07 MPa。根据围压与稻谷堆弹性模量的关系可以拟合得到方程：y=Ax＋B,其中,A、B为与水分有关的参数。在相同水分条件下,稻谷堆的弹性模量随着围压的增大而增大;在相同围压条件下,稻谷堆的弹性模量与水分没有显著的相关性。     

围压与含水率对小麦堆弹性模量影响的实验研究

使用应变控制式三轴仪,测定了不同围压和含水率条件下的小麦堆弹性模量,并分析了围压与含水率对小麦堆弹性模量的影响.实验结果表明：同一含水率下,小麦堆（含水率为11.88％ w.b、12.91％ w.b、14.40％ w.b、15.40％ w.b、16.85％ w.b）弹性模量随着围压（50 kPa～200 kPa）增大而增大;同一围压下,小麦堆的弹性模量随着水分的增大而减小.     

小麦堆压缩特性的实验研究

利用回弹模量仪对小麦堆（河南产）（水分为11.7%,13.33%,15.18%,16.55%,18.18%w.b）的密度和无侧向膨胀压缩体变模量进行了实验测定,实验选定加在样品顶部的压应力为：50 kPa、100 kPa、150 kPa、200 kPa、250 kPa、300 kPa,通过计算得出对应的样品平均竖直压应力为：36.8 kPa、74.8 kPa、110.9 kPa、153.4 kPa、184.7 kPa、221.0 kPa。进而得到样品所受的平均压应力为：18.3 kPa、41.9 kPa、66.7kPa、91.0 kPa、110.9 kPa、133.248 kPa。实验结果表明：在同一水分下,随着平均压应力的增大,小麦堆的密度也增大。在同一水分下,随着平均压应力的增大,小麦堆的体变模量也增大。拟合方程为y=axb,其中参数a、b随水分的不同而变化。     

大豆堆弹性模量的测定与分析

使用TSZ-6A型应变控制式三轴仪对不同围压(50 kPa、100 kPa、150 kPa、200 kPa)、不同含水率(9.8％、12.3％、15.8％、17.2％w.b)的大豆堆的弹性模量进行了测定,并分析了围压与含水率对大豆弹性模量的影响.实验结果表明:对于含水率范围为9.8％～17.2％ w.b的大豆堆,在围压为50 kPa～200 kPa的范围内,其弹性模量范围为3.07 MPa～28.80 MPa,在相同含水率条件下,大豆堆的弹性模量随着围压的增大而增大；在相同围压条件下,大豆堆的弹性模量随着含水率的增加而减小.     

稻谷籽粒的压缩特性与含水率关系的实验研究

通过Brookfield质构仪测定了不同含水率的稻谷籽粒(含水率为10.63%、12.25%、13.71%、15.18%、16.53%w.b.)在Z轴(短轴)方向上的压缩特性(破坏力、破坏能、表观接触弹性模量、最大接触应力、破坏应变),得出含水率对稻谷压缩特性的影响规律。实验结果表明:随着压缩形变的增加,稻谷籽粒受到的压力逐渐增加,当到达破裂点时达到最大值,随之急剧减小。随着含水率的增加,稻谷籽粒的压缩破坏力、破坏能、表观接触弹性模量、破坏应力逐渐减小,压缩破坏应变逐渐增加。     

THE METHOD OF THE MEASUREMENT OF THE WORMWHEEL PROFILE ERROR WITH THE THREE-COORDINATE-MEASURE-MACHINE

In this paper we explain the method of the measurement of the wormwheel profile error with the three coordinate measuring machine. We first establish the wormwheel theoritical tooth profile equation according to the gear engage principle, then write the computing program and calculate the wormwheel theoritical profile, next analyse and calculate the error of the gage head interference. At last, we work out the measuring program and get the wormwheel profile measured with the three-coordinate measuring machine.     

THE ERRECT OF HIGH HARMONICS ON THE SELECTION OF THE SIZE OF TRANSFORMER CONDUCTOR

This paper analyses the additional stray losses of transformer winding caused by harmonics,and suggests that the influence of harmonics should be taken into consideration in the selection of the conductor' s size in rectifier transformer and converter transformer design.     

THE STRAIN OF THE BARS IN THE STRUCTURAL COLUMNS OF THE PRESTRESSED EARTHQUAKE-RESISTANT BRICK-WALLS

Through the comparative tests of prestressed and non-prestressed brick-walls un-der the repeated lateral loading,the effect of the prestress-force to the strain distribution in the non-prestressed bars of the structural columns has been investigated.This effect is beneficial:the pre-stress-force will reduce the value of strain in the bars of the lower part in the columns and uniformize the strain distribution along the whole height of the columns.Furthermore,instead of a strainreduction,the strain of prestressed be will increase along with the increasing of the lateral load.Thus,the coefficient of prestress-force-increase could be calculated in the tWo stages of the crack-resistance and ultimate bearing capacity.As a result,both the prestressed and non-prestressed barsare able to give the potential of their bearing capacity a full play,and improve the earthquake-resis-tant property.     

THE EFFECT OF THE STRESS OF LONGWALL AND STRUCTURE OF COAL ON THE BUMP OF COAL AND METHANE

The problems that the bump of coal and methame in the mine is contraled by the stress of longwall and that the coal and methane bump in the mine is affected by the physical properties of the coal are analysed and discussed through some specific bump cases. It is shown that the compressive stress, the content of the methane of the coal, and the bump of coal and methane are directly affected by the content of the ash and the volatile of the coal.     

粮堆局部处理机实仓熏蒸杀虫试验

采用粮堆局部处理机解决了高大平房仓大粮堆局部生虫的问题，对处理区内粮温，水分无大的影响，人工、耗电量、药剂用量大大降低。该机可用于熏蒸、整仓通风和新仓干燥。     

自生稻混入对稻米品质的影响

稻米的RVA粘度值和品尝评分值分别从稻米的物性指标和感官指标上标注了稻米的品质指标状态,粳稻中混入不同梯度的自生稻谷,稻米的RVA粘度值和品尝评分值的变化与自生稻混入的梯度呈现负相关性。     

挂面在储藏期间的品质变化

在实验室条件下进行了两种挂面的储藏实验.在储藏过程中分析了挂面的水分,脂肪酸值和烹煮特性的变化.实验结果表明,挂面的水分随空气中的湿度而变化,脂肪酸值随储藏时间而增加,增加到一定程度又开始下降.在挂面烹煮特性方面,挂面的吸水率在储藏期间开始呈增加的趋势,然后变化较平缓,最后开始下降.面汤中直链淀粉含量随储藏时间迅速减少.挂面的烹煮损失呈下降趋势.     

THE RESEARCH OF AERODYNAMIC PARAMETER ABOUT THE PIPE-CASING GUN OF THE EQUAL ACROSS-SECTION

The computation principle for the pipe-casing gun of the equal acress-section area is studied by applying the basic theory of compressible. The aerodynamic parameter of the pipecasing gun and the friction factor of rustless sted-pipes and copper-pipes of different diameters are measured. On the basis of this measurement, the outlet-velcity profile and the change of the rate and pressure on the axis are measured. The results show that the friction factor measured is reliable and the computation method is practical.     

晋南盆地小麦产量结构与产量水平关系的分析

本文利用农业资源动态监测体系,对晋南盆地小麦产量结构及其水平的关系进行了分析研究,找出了中、低产水平下成穗数、穗粒数、千粒重三者与产量的关系.三者的合理组成以及它们在形成产量时的相对贡献,对制定晋南盆地小麦栽培管理措施具有一定的参考作用.     

THE STUDY OF ANTI-SEISMIC BEHAVIOR OF THE TOP CORNER JOINTS OF REINFORCED CONCRETE FRAME WITH THE INCLUSION OF STEEL FIBRES

This paper first discusses the limited effect of steel fibre reinforcement on plain concrete and reinforced concrete. Then, making a comparison among the test results of three full-scale top corner joint assemblies of frame, in which only two of them are added with steel fibres in joint zone. The advantageous and disadvantageous influence in anti-seismic aspect is investigated after adding steel fibres in the joint zone. Finally, this paper gives an overall comment on the application future of using the steel fibres in every kinds of joint of anti-seismic reinforced concrete frame.