蛇床子素粉剂对储粮害虫的防治效果

研究了1.6%蛇床子素粉剂对谷蠹、米象、赤拟谷盗、嗜卷书虱等4种储粮害虫的室内防治效果。在按制剂量计算分别为25 mg/kg、50 mg/kg和75 mg/kg剂量下,1.6%蛇床子素粉剂对供试的4种储粮害虫均有显著的防治效果;其中对米象、赤拟谷盗和嗜卷书虱等3种试虫的作用迅速,施药7d后校正死亡率或虫口抑制率均达到了100%;而低浓度下对谷蠹的作用较为缓慢,25 mg/kg下14 d后校正死亡率才达到95%以上。     

一种新型惰性粉杀虫剂对几种储粮害虫杀虫效果的研究

研究了一种以硼酸钠为主要成分的新型惰性粉杀虫剂对米象、谷蠹、锯谷盗、赤拟谷盗、锈赤扁谷盗和小眼书虱的触杀、胃毒、种群抑制作用。研究表明该药剂对米象、谷蠹、锯谷盗、赤拟谷盗和锈赤扁谷盗均具有一定的触杀作用,对小眼书虱触杀效果极为显著,当剂量为4g／m^2时,第3天小眼书虱就全部死亡。该药剂对米象的胃毒效果最强,在剂量为4g／kg时死亡率达到100％;对谷蠹、锯谷盗和赤拟谷盗具有较好的胃毒杀虫效果。在剂量4g／kg时对锯谷盗种群抑制率达到100％,对米象、谷蠹、赤拟谷盗、锈赤扁谷盗的种群也有较强的抑制作用。以上结果说明了该杀虫剂具有作为一种储粮保护剂的开发潜力。     

A STUDY ON STORED GRAIN INSECIS EXPOSED TO DIFFERENT NITROGEN CONCENTRATION AT 25℃

在25℃±1℃,70％±5％R.H.的条件下,研究90％、95％和98％浓度的氮气对储粮害虫的控制效果,结果表明:90％以上氮气对混合虫态发育为成虫以及成虫的生育均有抑制作用,时间越长,抑制效果越好,90％氮气不能用于对害虫成虫的防治;95％氮气对米象、锈赤扁谷盗和书虱成虫有效,但不能有效防治赤拟谷盗和谷蠹成虫,对所有试虫的混合虫态均可以控制,但需要通气的时间较长,对混合虫态的控制效果为依次为:米象＞赤拟谷盗＞锈赤扁谷盗＞谷蠹；98％氮气对所有成虫的控制效果均较好,对混合虫态发育为成虫的控制效果也较好,对成虫的控制效果依次为:米象＞锈赤扁谷盗＞赤拟谷盗＞谷蠹,对混合虫态的控制效果依次为:赤拟谷盗＞锈赤扁谷盗＞米象＞谷蠹.不同浓度氮气对害虫的防治效果与害虫是否具有PH3抗性无关,氮气气调可用于对PH3抗性虫种的防治.     

中央储备粮中主要害虫种类及抗性状况调查

通过对246个中央储备粮库磷化氢熏蒸杀虫应用情况的调查信息分析,归纳了当前中央储备粮储藏中通常发生的主要害虫种类及其对应于储粮生态区域分布的差异性,通过对磷化氢熏蒸杀虫难度的调查,研究了储粮害虫对磷化氢的抗性概况,并对磷化氢有效熏蒸杀虫提出大体建议.结果表明,在中央储备粮中实际发生的害虫种类很少,只有米象、玉米象、谷蠹、赤拟谷盗、锯谷盗、长角扁谷盗、锈赤扁谷盗、土耳其扁谷盗和书虱常见.而较难熏蒸治理的种类主要是书虱、长角扁谷盗、土耳其扁谷盗、锈赤扁谷盗、谷蠹、米象、赤拟谷盗等,且熏蒸治理难度较大的储粮区主要在华南区、华东华中区和西南区.     

25℃条件下不同氮气浓度对储粮害虫控制效果研究

在25℃±1℃,70%±5%R.H.的条件下,研究90%、95%和98%浓度的氮气对储粮害虫的控制效果,结果表明:90%以上氮气对混合虫态发育为成虫以及成虫的生育均有抑制作用,时间越长,抑制效果越好,90%氮气不能用于对害虫成虫的防治;95%氮气对米象、锈赤扁谷盗和书虱成虫有效,但不能有效防治赤拟谷盗和谷蠹成虫,对所有试虫的混合虫态均可以控制,但需要通气的时间较长,对混合虫态的控制效果为依次为:米象>赤拟谷盗>锈赤扁谷盗>谷蠹;98%氮气对所有成虫的控制效果均较好,对混合虫态发育为成虫的控制效果也较好,对成虫的控制效果依次为:米象>锈赤扁谷盗>赤拟谷盗>谷蠹,对混合虫态的控制效果依次为:赤拟谷盗>锈赤扁谷盗>米象>谷蠹。不同浓度氮气对害虫的防治效果与害虫是否具有PH3抗性无关,氮气气调可用于对PH3抗性虫种的防治。     

硫酰氟熏蒸稻谷实仓示范试验研究

在储存2028 t优质中籼稻的房式仓,采用20 g/m3的硫酰氟环流24 h、熏蒸5 d的试验表明硫酰氟熏蒸对玉米象、米象、谷蠹、赤拟谷盗、书虱等5种7个品系储粮害虫具有很好的杀灭效果和抑制作用,并且反映硫酰氟熏蒸对磷化氢抗性害虫和敏感害虫没有明显的不同效果;同时通过定点和综合样的稻谷品质分析发现,硫酰氟熏蒸对稻谷品质没有表现出负面影响.通过对2个点不同层面稻谷中残留分析,各个点的残留都不超标,都符合GB 2762-2005的要求.     

高纯氮气对储粮害虫致死效果的研究

本研究在30±1 ℃,相对湿度75%±5%的高纯氮气环境中对几种主要储粮害虫进行生物测定并检测结果.玉米象、米象、谷蠹、赤拟谷盗(中山品系)、杂拟谷盗、赤拟谷盗(益阳品系)、嗜卷书虱和锯谷盗的LT50值由大到小排列顺序为34.0 h、32.5 h、32.5 h、13.9 h、13.4 h、12.5 h、5.4 h和5.1 h.不同试虫对高纯氮气环境忍耐能力差异显著.     

五种储粮害虫11个品系的磷化氢抗性测定

本文运用FAO(1975)推荐的测定储粮害虫磷化氢抗性的方法，对米象、谷蠹、赤拟谷盗、平米象和锯谷盗五种储粮害虫的11个品系进行毒力测定，得出它们的LC50值，米象的LS2和GDSo，玉米象HNZZSz—l和GDGZSz—l，谷蠢的QQRd和Rd一7，赤拟谷盗的QQTc-4、SDQHTc—l和HNSQTc—l以及锯谷盗VOs48和HNNYOs—1等11个品系的磷化氢致死中浓度(LC50)分别为0．0088和1．3006，0．0057和0．0058，0．0042和1．3779，0．0047、2．1009和0．9926以及0．0073和0．00090mg/L。其中磷化氢敏感品系为LS2、QQRd、QQTc—4、HNZZSz—l、GDGZSz—l、VOs48和HNNYOs—1；抗性品系为GDSo、RD-7、SDQHTc-l和HNSQTc—l，抗性系数Rf分别为148、327、449和212倍，抗性非常严重。测定结果为今后的磷化氢抗性研究工作提供了基础数据。     

储粮害虫钻孔行为初步研究

设计的测定储粮害虫钻孔行为的装置由8种不同孔径的孔筛小瓶组成，筛孔直径分别为1．5mm,1.3mm,1.2mm,1.1mm,1mm,0.9mm,0.8mm及0.6mm，采用该装置对玉米象、米象、赤拟谷盗、杂拟谷盗、长头谷盗、谷蠹及锯谷盗单一种群和复合种群钻孔行为习性进行测试。测试结果表明，单一群条件下，玉米象、米象、谷蠹及长头谷盗钻孔行为习性进行测试。测试结果表明，单一种群条件下，玉米象、米象、谷蠹及长头谷盗钻孔指数分别为0．28、0．30、0．35及0．24，钻孔习性基本相似；杂拟谷盗和赤拟谷盗钻孔指数分别为0．77和0．9；锯谷盗活动性较强，钻孔指数为0．57。讨论了玉米象、赤拟谷盗、长头谷盗、锯谷盗及谷蠹复合种群各害虫种类的钻孔习性，与单一种群比较，玉米象和谷蠹钻孔指数增高，赤拟谷盗和锯谷盗钻孔指数降低，长头谷盗钻孔指数变动不大。     

紫外诱杀灯和瓦楞纸诱捕与取样筛检法检测储粮害虫比较研究

在散装储藏稻谷的平房仓中比较研究了紫外诱杀灯、瓦楞纸板和取样筛检检测储粮害虫的效果。在夏季近4个月的研究观察中，发现紫外诱杀灯可较取样筛检早近2个月大量检测到锈赤扁谷盗，早约2个月检测到较多的谷蠹，紫外诱杀灯没有诱集到赤拟谷盗。瓦楞纸板诱捕锈赤扁谷盗和赤拟谷盗较取样筛检法所得时间早、数量多，但在检测到谷蠹的时间上要比取样筛检晚4周的时间。随着环境温度的升高，紫外诱杀灯和瓦楞纸板诱集到锈赤扁谷盗和赤拟谷盗的数量都有增加和波动，瓦楞纸板诱集到谷蠹的数量变化很小。     

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.