电动潜油泵导壳装配压缩量的工程计算方法

针对电动潜油泵导壳装配压缩不足或过量均对泵造成损害的问题 ,在理论分析影响装配压缩量因素的基础上 ,推导了导壳受压变形量、泵壳体受拉变形量及导壳装配压缩变形量的计算公式。按计算公式对大庆潜油电泵技术服务公司生产的 98系列 10 0m3 /d浮动式电动潜油泵做了实例计算 ,并进行了拆检和试验。结果表明 ,装配压缩量低于计算值 ,泵运行中压力不稳定 ,泵导壳止口有泄漏点 ;装配压缩量达到计算值 。

油泵叶轮与导壳强度分析

在工程实践中，泵叶轮与导壳（特别是导叶）常发生疲劳破坏，应用三维有限元方法对泵叶轮及导壳（包括导叶）进行了强度分析和计算，并对周期性边界条件作了有效处理。利用编制的Fortran通用程序，对某型离心式潜油泵叶轮及导壳进行了强度设计，结果表明，主应力较大的点主要集中在前后盖板边缘、盖板与叶片交界处和叶片中间位置，且最大主应力值小于泵所用材料的强度极限值，故该泵满足强度要求。

导叶涡壳组合式双级泵的研究

文章介绍了一种新型导叶涡壳组合式双级泵的结构及工作原理,该泵在高速运转时,导叶、涡壳组合式双级泵液体具有稳定的相对运动,从叶轮流出来的高速液体的动能迅速转换为压能,消除液体的速度环量,减小径向力。在泵吸入口增设消旋器,解决了泵在高转速下容易产生汽蚀等问题,又起支撑轴的作用,泵运转平稳、可靠、寿命长。论述了泵的设计方法,并给出了泵的性能试验结果;泵的效率比国家标准规定效率提高8%,泵汽蚀余量比国家标准规定值低0.7m。最后总结了泵的优点,该泵的研究是成功的,而且质量减轻30%以上。

Boosting photocatalytic hydrogen evolution enabled by SiO_(2)-supporting chiral covalent organic frameworks with parallel stacking sequence

Two-dimensional covalent organic frameworks(2D COFs)feature extendedπ-conjugation and ordered stacking sequence,showing great promise for high-performance photocatalysis.Periodic atomic frameworks of 2D COFs facilitate the in-plane photogenerated charge transfer,but the precise ordered alignment is limited due to the non-covalentπ-stacking of COF layers,accordingly hindering out-of-plane transfer kinetics.Herein,we address a chiral induction method to construct a parallelly superimposed stacking chiral COF ultrathin shell on the support of SiO_(2) microsphere.Compared to the achiral COF analogues,the chiral COF shell with the parallel AA-stacking structure is more conducive to enhance the built-in electric field and accumulates photogenerated electrons for the rapid migration,thereby affording superior photocatalytic performance in hydrogen evolution from water splitting.Taking the simplest ketoenamine-linked chiral COF as a shell of SiO_(2) particle,the resulting composite exhibits an impressive hydrogen evolution rate of 107.1 mmol g^(-1)h^(-1)along with the apparent quantum efficiency of 14.31% at 475 nm.Furthermore,the composite photocatalysts could be fabricated into a film device,displaying a remarkable photocatalytic performance of 178.0 mmol m^(-2)h^(-1)for hydrogen evolution.Our work underpins the surface engineering of organic photocatalysts and illustrates the significance of COF stacking structures in regulating electronic properties.

高温高压下岩石的电性研究

高温高压下岩石的电性研究是了解地球内部物质组成、运移及演化的重要手段，因而日益受到地球物理学界人士的青睐．本文从测量方法、设备及影响因素等方面介绍了高温高压下电性研究的发展进程，探讨了高温高压下电性研究的发展方向．

Microstructure and properties of SiC_p/Al electronic packaging shell produced by liquid-solid separation

The electronic packaging shell of high silicon carbide （54%SiC, volume fraction） aluminum-based composites was produced by liquid-solid separation technique. The characteristics of distribution and morphology of SiC as well as the shell’s fracture surface were examined by optical microscopy and scanning electron microscopy, and the thermo-physical and mechanical properties of the shell were also tested. The results show that Al matrix has a net-like structure while SiC is uniformly distributed in the Al matrix. The SiCp/Al composites have a low density of 2.93 g/cm^3, and its relative density is 98.7%. Thermal conductivity of the composites is 175 W/（·K）, coefficient of thermal expansion （CTE） is 10.3×10^-6 K-1 （25-400 ℃）, compressive strength is 496 MPa, bending strength is 404.5 MPa, and the main fracture mode is brittle fracture of SiC particles accompanied by ductile fracture of Al matrix.Its thermal conductivity is higher than that of Si/Al alloy, and its CTE matches with that of the chip material.

从重磁场特征探讨南北构造带北段与地震带的统一性

从分析地球物理场特征着手,提出将南北向重力梯级带和重磁场特征东西差异作为划分南北构造带的依据,探讨了形成南北构造带的区域与深部地质构造背景以及地震成带分布的对应关系。重力梯级带反映的南北构造带既有与中轴构造一致的继承性,又有向西拓展的新生性,并在南北统一成带的基础上叠加了分段性,形成南压北张不同背景的控震、控热机制,同时也是构成青藏高原东界和我国大陆构造域东西分界线,对应着狭义南北地震带。

Tomato Resistance to Botrytis cinerea Induced by Chitosan

[Objective] The aim was to explore the effect of tomato＇s resistance to Botrytis cinerea induced by exogenous Chitosan.[Method] The leaf spraying method was used to determine the induced resistance effect of Chitosan to tomato B.cinerea and the chlorophyll content,soluble protein,soluble sugar,proline influence,the activities of peroxidase（POD）,malondialdehyde（MDA）and the Proline content in leaves of tomato.[Result] The induced resistance of Chitosan reached 58.26% at 14th d after treatment;Compared with the B.cinerea stress group,the chlorophyll content in leaves of tomato seedlings of B.cinerea stress ＋ Chitosan group had increased by 34.63%,while that of soluble protein content,soluble sugar content,Pro content and POD activity was 5.30%,10.83%,16.21% and 16.88%,respectively（except for the MDA content,which was decreased by 16.54%）.[Conclusion] Exogenous Chitosan could improve photosynthetic efficiency and protect enzymes activity to improve the resistance of tomato seedlings to B.cinerea.

择帅·奇招

中国古代的谋略,至三国时期发展为集大成,出神入化,令人叹为观止。罗贯中又在此基础上,总结了三国至元明之际的谋略成果,在《三国演义》中加以发扬光大,于是,《三国演义》成了中国的谋略库。三国谋略,不只是适用于政治和军事斗争,也同样适用于商战。江苏苏州、无锡市乡镇企业的成功,充分说明了这一点!

Effect of Chaetomium globosum ND35 on Plant Growth and Preliminary Study of Its Biocontrol Efficacy

[Objective] The aim was to study effect of Chaetomium globosum ND35 on plant growth and preliminary study of its biocontrol efficacy, and provide basis for popularization and application of this strain.[ Method] With endophytic fungus C. globosum ND35 as a tested strain, effect of C. globosumND35 on plant growth and its biocontrol on five plant diseases were investigated in the greenhouse and field,[Result]The results showed that ND35 promoted growth of lateral root and diameter of breast height of poplar. ND35 can induce poplar to resist Poplar Valsa Canker caused by Valsa sordida and Poplar Rust caused by Melampsora puplicola. ND35 was also able to induce tomato and bean to resist Botrytis cinera. Biocontrol of Bean Stem Rot Rhizoctonia by ND35 was effective as well. [Conclusion] Induced systemic resistance by endophytic C. globosum ND35 plays an important role in biocontrol of plant diseases.

Fast Prediction of Acoustic Radiation from a Hemi-capped Cylindrical Shell in Waveguide

In order to predict acoustic radiation from a structure in waveguide, a method based on wave superposition is proposed, in which the free-space Green＇s function is used to match the strength of equivalent sources. In addition, in order to neglect the effect of sound reflection from boundaries, necessary treatment is conducted, which makes the method more efficient. Moreover, this method is combined with the sound propagation algorithms to predict the sound radiated from a cylindrical shell in waveguide. Numerical simulations show the effect of how reflections can be neglected if the distance between the structure and the boundary exceeds the maximum linear dimension of the structure. It also shows that the reflection from the bottom of the waveguide can be approximated by plane wave conditionally. The proposed method is more robust and efficient in computation, which can be used to predict the acoustic radiation in waveguide.

Facile synthesis of UCNPs/Zn_xCd_(1-x)S nanocomposites excited by near-infrared light for photochemical reduction and removal of Cr(Ⅵ)

Photocatalysis driven by near-infrared（NIR）light is of scientific and technological interest for ex-ploiting solar energy.In this study,we demonstrate a facile hydrothermal process to synthesize core-shell nanoparticles combining upconversion nanoparticles（UCNPs）and alloyed ZnxCwhich can be excited using NIR or visible light.Morphologies,phase,and chemical composition have been investigated using field-emission scanning electron microscopy,transmission electron mi-croscopy,X-ray diffraction analysis,and atomic absorption spectroscopy.Moreover,we found that amorphous TiO2 layers existing in the final samples play an important role in formation ofyolk-shell nanoparticles,which bind the as-prepared ZnxCnanoparticlescan be tuna-ble by adjusting the amount of the Cd and Zn source compounds.The photochemical reduction of Cr（Ⅵ）in water has been performed to study the photocatalytic performance under irradiation by NIR light or a simulated solar light,showing efficient photoreduction and Cr（Ⅵ）removal over the/TiO2 yolk-shell nanoparticles.The as-prepared UCNPs@ZnxC/TiO2 nanoparticles show excellent production of hydroxyl radicals,which are responsible for the photochemical reduction of Cr（Ⅵ）to Cr（Ⅲ）.This study will provide an alternative strategy for en-vironmental wastewater treatment,making full use of solar energy.

350QJ500型潜水泵技术性能及经济性分析

原有生产的400QJ500型潜水泵口径大,生产制造比较困难,使得生产成本也提高,销售价格高,为了满足用户需求,从而提出研制开发350QJ500型潜水泵,该项目流量大、单级扬程高、适用井径小,节约原材料显著,生产制造成本低,具有广大的市场前景。

重油催化裂化装置主风机安装损坏事故原因分析

某炼油厂重油催化裂化装置AV100-13型轴流式主风机在下承缸安装过程中,由于吊装方法不合理发生下壳体导槽受力过大而损坏的事故。文中对设备损坏原因进行了分析,同时提出合理的安装建议指导机组顺利安装,避免同类事故的再次发生。

The role of phosphatidylinositol signaling pathway in regulating serotonin-induced oocyte maturation in Mercenaria mercenaria

Serotonin (5-HT) has been found to stimulate meiotic maturation of oocytes in many molluscs. During maturation, several signaling pathways are involved, especially the phosphatidylinositol and cAMP pathways. In order to examine the possible role of the phosphatidylinositol signaling pathway in regulating oocyte maturation in Mercenaria mercenaria, the effects of the activator/inhibitor of phospholipase (PLC) and protein kinase C (PKC) on serotonin-induced maturation were studied. Results show that high-concentrations of neomycin (inhibitor of PLC) blocked oocyte maturation, while 9, 10-dimethyl-1, 2-benzanthracene (DMBA, activator of PLC) promoted oocyte maturation in the presence of serotonin. It was also found that in the presence of serotonin, phorbol 12-myristate 13-acetate (PMA, activator of PKC) inhibited oocyte maturation, while sphingosine (inhibitor of PKC) stimulated oocyte maturation. These results indicate that serotonin-induced oocyte maturation requires the activation of the phosphatidylinositol pathway. Decrease of PLC inhibited serotonin-induced oocyte maturation, whereas a decrease of PKC stimulated the maturation. Thus, our study indicates that serotonin promotes maturation of M. mercenaria oocytes through PLC stimulated increase in calcium ion concentration via inositol-1, 4, 5-trisphosphate (IP3) but not PKC.

Research on the Fragment Impact Resistance of a Composite Mast

Due to the unique structural mode and material property of a composite sandwich plate, related research such as fragment impact resistance of a composite mast is short of publication and urgent in this field. In this paper, the commonly accepted sandwich core board theory was modified. Damage caused by a fragment attack was simulated onto a sandwich plate model built with solid and shell elements. It was shown that shear failure and vast matrix cracking are the main reasons for outer coat damage, and tension failure and partial matrix cracking are the cause for inner coat damage. Additionally, according to complexities in actual sea battles, different work conditions of missile attacks were set. Ballistic limit values of different fragment sizes were also obtained, which provides references for enhancing the fragment impact resistance of a composite mast.

Effect of Solving Models on Euler Vectors

In the process of solving Euler vectors based on GNSS horizontal movement field,the number of estimated parameters can affect Euler vector results. This issue is analyzed through theoretical deduction and practical example in this paper. Firstly,the difference between the results of Euler vectors in different solving models is deduced. Meanwhile, based on GNSS horizontal movement field in the Chinese mainland from 2004 to 2007,two common models( RRM and REHSM) are used to discuss the impact of solving models on Euler vectors and the follow-up study. The result shows that the maximum value of the difference in a block's entire rotation can reach 2. 6mm /a,and should not be ignored. Therefore,the results of horizontal movement are different using different kinematic block models,and this should be paid more attention in the analysis of crustal horizontal movement.

Experimental study of the electrical conductivity of hydrous minerals in the crust and the mantle under high pressure and high temperature

Hydrous minerals are important water carriers in the crust and the mantle, especially in the subduction zone. With the recent development of the experimental technique, studies of the electrical conductivity of hydrous silicate minerals under controlled temperature, pressure and oxygen fugacity, have helped to constrain the water distribution in the Earth's interior. This paper introduces high pressure and temperature experimental study of electrical conductivity measurement of hydrous minerals such as serpentine, talc, brucite, phase A, super hydrous phase B and phase D, and assesses the data quality of the above minerals. The dehydration effect and the pressure effect on the bulk conductivity of the hydrous minerals are specifically emphasized. The conduction mechanism of hydrous minerals and the electrical structure of the subduction zone are discussed based on the available conductivity data. Finally, the potential research fields of the electrical conductivity of hydrous minerals is presented.

Design of a compact athermalized infrared seeker

In order to meet the application requirement of a certain long wavelength infrared （LWIR） seeker, a small volume, light weight and passively athermalized infrared OR） objective is designed in this paper. The two-lens telephoto struc- ture is adopted by merely using aluminum alloy as the housing material. By balancing the thermo-optical coefficient and thermal expansion coefficient of materials, an athermalized IR seeker with effective focal length of 90 mm and F number of 1.2 is achieved. The whole optical length is 75 ram, and the weight is only 234 g. The objective can remain fine imaging quality under temperature range from -40 ℃ to 60 ℃, which is beneficial to the lightweight design oflR seekers.