36%渗乐乳油

３６％渗乐乳油田ＨＰ－１增效剂与乐果及其他助剂调配而成。五年田间小区和大田药效试验证明：３６％渗乐乳油高效，安全，用量少，对各类蚜虫防效优异。     

Evaluation of tempering induced changes in the hardness profile of case-carburised EN36 steel using magnetic Barkhausen noise analysis

The effect of tempering on the magnetic Barkhausen noise (MBN) signal profile was studied in case-carburised EN36 steel using a range of magnetic excitation frequencies and a number of frequency ranges for analysis of the MBN signal. The MBN level generally increases with tempering due to coarsening of the microstructure. With higher values of excitation frequency, f_EX, the MBN profile exhibits a single peak, but with low values of f_EX, double peaks are observed. The MBN peak obtained with higher f_EX was found to correlate well with hardness changes in a region, down to 100 μm below the surface. The analysis of the MBN signal produced with low f_EX, in narrow frequency ranges selected by software frequency filtering, showed variations in the extent of changes in the relative height of the two MBN peaks in the profile. After taking into account the skin depth-frequency relation for the MBN signal, variations in the values of the two MBN peaks in different analysing frequency ranges were found to correlate well with hardness variations at different depths down to 425 μm below the surface. An empirical relationship has been established between the hardness-depth profile and the MBN measurements.     

Effects of sulfate-reducing bacteria on the corrosion behavior of carbon steel

The influences of the growing process of sulfate-reducing bacteria (SRB) in seawater system on the medium state and corrosion behavior of carbon steel were studied by detecting solution state parameters and using corrosion electrochemical methods. The growing process of SRB in the seawater shows the three stages of growing, death and residual phases. The solution state parameters of the concentration of sulfide, the pH value and the redox potential changed during the three stages of the SRB growing process. And the corrosion rate of D36 carbon steel was accelerated during the growing phase and stable during the death and residual phases. The results indicate that the medium state and the corrosion rate of the steel do not depend on the number of active SRB, but depend on the accumulation of the metabolism products of SRB.     

Monitoring slope deformation using a 3-D laser image scanning system:a case study

An ILRIS-36D 3-D laser image scanning system was used to monitor the Anjialing strip mine slope on Pingshuo in Shanxi province.The basic working principles,performance indexes,features and data collection and processing methods are illustrated.The point cloud results are analyzed in detail.The rescale range analysis method was used to analyze the deformation characteristics of the slope.The results show that the trend of slope displacement is stable and that the degree of landslide danger is low.This work indicates that 3-D laser image scanning can supply multi-parameter,high precision real time data over long distances.These data can be used to study the distortion of the slope quickly and accurately.     

120°相带环形绕组圆筒型永磁直线发电机定位力降低的优化设计

圆筒型永磁直线发电机(TPMLG)采用120°相带环型绕组可以提高其功率密度,然而,TPLMG具有较大的定位力,这会引起发电机的振荡甚至使系统不稳定.为了解决这一问题,该文对120°相带环形绕组(120°-TPMLG)的圆筒型永磁直线发电机进行优化设计.首先利用有限元方法研究不同结构参数(定子铁心长度、极弧系数、槽肩宽度、定子齿宽和气隙长度)对定位力的影响.根据分析结果,结合田口方法对发电机进行优化设计,在不损失输出功率的情况下使定位力最小,得到120°-TPMLG的最优结构参数.为了验证优化设计过程的有效性,将优化后的120°-TPMLG与初始发电机的性能进行比较.结果表明,优化后的120°-TPMLG的定位力得到了极大的减小,输出功率也略有增加.因此,该文采用的优化方法对减小120°-TPMLG的定位力是有效的.     

EH36钢埋弧焊接头CTOD试验中的突跃效应及评价

根据BS 74 4 8试验标准 ,在对海洋石油平台用钢EH36单、双丝埋弧焊接头的焊缝和热影响区 (HAZ)进行低温下 (- 15℃ )裂纹尖端张开位移 (CTOD)测试时 ,多个试样出现了”突跃”(F -V曲线上瞬间载荷下降、位移增加变慢 ) ,亦称”POP -IN”现象。针对这一问题 ,依据BS 74 4 8-Ⅰ中的有关评定标准 ,对存在POP -IN现象的试样进行了F-V曲线上载荷 -位移变化的测量、计算 ,并在光学显微镜 (× 10 0 0 )下观察了断裂面上脆性起裂点处的微观组织 ,从而合理取舍了焊接接头这一非均质结构中出现的POP -IN效应。     

Magnetic order and evolution of the electronic state aroundx=0.12 in La2?xBaxCuO4 and La2?xSrxCuO4

Muon spin rotation ( ⁺SR) measurement provides clear evidence of the antiferromagnetic order of Cu moments below 35 K for La_2–x Ba _x CuO₄ and below 15 K for La_2–x Sr _x CuO₄ in the narrow range ofx where the high-T _c superconductivity (SC) is suppressed remarkably. The results suggest that the change of the electronic state coupled with the lattice instability is relevant to the local suppression of SC and freezing of spin fluctuations of the Cu moment.     

改性偶氮二甲酰胺/水复合发泡在硬质聚氨酯发泡中的应用研究

目的 通过偶氮二甲酰胺(AC)热分解反应释放出发泡用气体,用改性偶氮二甲酰胺/水复合发泡制备无卤素硬质聚氨酯泡沫(RPUF)。探讨改性偶氮二甲酰胺在聚氨酯发泡中的可行性。方法 通过改变体系中改性偶氮二甲酰胺的用量,探讨改性偶氮二甲酰胺对聚醚发泡体系黏度、聚氨酯泡沫力学性能和导热系数的影响。结果 发泡剂的加入能显著降低聚醚体系的黏度,提高发泡物料的流动性,随着改性AC用量的增加,体系黏度逐渐增加,当改性AC的添加量为0.3 g时,体系黏度最低为2 080 mPa.s。当改性AC用量为0.75 g时,聚氨酯泡沫的表观密度为78.65 kg/m³,压缩强度为539.35 kPa,改性AC的加入使得聚氨酯泡沫的导热系数增高,导热系数为0.023 51 W/mK。结论 改性AC的加入能显著提高硬质聚氨酯泡沫的压缩强度,相比纯水发泡,二者复合发泡性能更优异,可以作为无卤素发泡剂应用于聚氨酯发泡。     

On the surface area of the -star graph

We present an explicit formula for the surface area of the (n,k)-star graph, i.e., the number of nodes at a certain distance from the identity node in the graph, by identifying the unique cycle structures associated with the nodes in the graph, deriving a distance expression in terms of such structures between the identity node of the graph and any other node, and enumerating those cycle structures satisfying the distance restriction.The above surface area derivation process can also be applied to some of the other node symmetric interconnection structures defined on the symmetric group, when the aforementioned distance expression is available.     

基于CPLD的坐标参量采集卡的设计和实现

坐标参量采集卡是一种用于采集全数字摄影测量系统地面影像模型坐标位移量及坐标的专用设备,该设备采用CPLD和VHDL语言实现增量式旋转编码器的脉冲信号鉴相、脉冲计数、设备状态控制以及和PCI总线芯片CH365之间的数据交换和通信功能,具有实时性强、工作稳定、通用性较好和性价比高等特点,本文主要介绍了这种设备的硬件和接口程序设计,并对设计中的相关问题进行了探讨.