5寸半尾管悬挂装置在稠油电泵井的应用

西北油田超深超稠油油藏"两超五高"的特点,电泵采油是主要机械举升方式。受限于环空掺稀油的降黏工艺,稀油与稠油充分混配成为影响电泵井运行寿命的关键因素。西北油田研制超稠油潜油电泵尾管装置可提高稀稠油混配效果,加快井筒内流体流速,改善电泵机组散热效果,延长运行寿命。为改变7寸套管回接电泵井无法组下尾管悬挂装置的现状,从两个方向研制改造5寸半尾管悬挂装置,以改善稠油区块电泵井运行工况,延长运转寿命。

胎圈着合宽度对7.00R16LT全钢轻型载重子午线轮胎性能的影响

研究胎圈着合宽度对7.00R16LT全钢轻型载重子午线轮胎性能的影响。结果表明,与胎圈着合宽度采用标准轮辋宽度设计轮胎相比,着合宽度宽半寸设计轮胎在标准轮辋上装配后胎圈部位内收位移增大,胎圈部位与胎肩部位的应力分布得到平衡,胎肩部位接地压力分布得到较大改善,轮胎耐久性能提升了8%。

張家山漢簡《筭數書》“相乘”算題校釋二則

張家山漢簡《筭數書》整理者所釋“相乘”算題簡1釋文中有“半分寸”,簡3釋文中有“一半”,均不確,當分别釋爲“半寸”“半”。現有15項對“半寸”的釋讀成果中,有2項釋讀爲“半”,有1項釋讀爲“半寸而”,有11項釋讀爲“半分寸”,有1項釋讀爲“半寸”但未具理由;現有15項對“半”的釋讀成果中,有13項釋讀爲“一半”,有1項釋讀爲“一半”或“半”但未具理由,有1項釋讀爲“半”亦未具理由。通過核對簡1、簡3的紅外綫圖版,結合文意,確認所涉释文分别是“半寸”和“半”字;從數學史與語言學的角度,討論“半分寸”與“半寸”和“一半”與“半”的含義及區别,從而證明分别釋讀爲“半寸”“寸”是正確的。

Quantum size effects in InP inner film fiber

Based on the semiconductor amplifiing properties and the structure of optical fiber wave guide an InP inner fiber is developed.The InP inner film fiber can be employed as a small size,broadband,and ultra-short fiber amplifier. The quantum size effects of the fiber are emphatically investigated in the work. Using the experimental data,we compare the effective mass approximation （EMA） with effective pararneterization within the tight binding （EPTB） models for the accurate description of the quantum size effects in InP. The results show that the EPTB model provides an excellent description of band gap variation over a wide range of sizes. The Bohr diameter and the effective Rydberg energy of InP are calculated. Finally,the amplifiing properties of the InP inner film fiber are discussed due to the quantum size effects.

Effect of initial microstructure on superplastic deformation of AZ70 magnesium alloy

The mechanical properties and deformation mechanism of semi-continuously casting and as-extruded AZ70 magnesium alloys in a wide range of grain sizes(from 14 to 103μm)were investigated at 653 K and 1×10-3s -1.It is discovered that with reducing grain size,flow stress is weakened and plasticity is improved and even superplasticity exhibits.SEM and OM were used to clarify the deformation mechanism.It is suggested that dynamic recrystallization(DRX)is the coordination deformation mechanism of grain boundary sliding(GBS)for coarse grain,and cavity and intracrystalline slip are the coordination deformation mechanisms of GBS for fine grain.

Effects of Au nanoparticle size and metal-support interaction on plasmon-induced photocatalytic water oxidation

Plasmonic photocatalysis with tunable light absorption has aroused significant attention in so-lar-to-chemical energy conversion.However,the energy conversion efficiency of plasmonic photo-catalysts is impeded by ineffective charge separation and the lack of highly active sites for redox reactions.In this work,the Au nanoparticle size and Au-TiO2 interaction of the Au/TiO2 plasmonic photocatalyst were adjusted simultaneously using a post-calcination treatment.The visi-ble-ight-induced water oxidation activity exhibited a volcano-like relationship with the calcination temperature;the treated photocatalyst at 600°C manifested the highest activity.Characterization with UV-visible spectra,XRD,SEM,and XPS revealed that the effect of the Au nanoparticle size and Au-TiO2 interaction were both responsible for the increase in plasmon-induced water oxidation activity.

Combined effects of ECAP and subsequent heating parameters on semi-solid microstructure of 7075 aluminum alloy

The combined effects of equal channel angular pressing (ECAP) and subsequent heating to a semi-solid temperature on the microstructural characteristics of the 7075 aluminum alloy were investigated. The microstructure is influenced by several parameters including the number of ECAP passes, ECAP route, consequent heating temperature, and holding time. The effects of these parameters on the microstructural characteristics including grain size and shape factor of the 7075 aluminum alloy were studied using experimental tests and Taguchi method. The results indicate that five-pass ECAP in route BA and subsequent isothermal holding at 630 °C for 15 min are more appropriate for achieving a semi-solid microstructure. The processing route and holding time have the highest impact on the grain size while the number of ECAP passes and heating temperature have the least impact on the grain size. Meanwhile, the shape factor is significantly influenced by the processing route, holding time and heating temperature while it is less influenced by the number of ECAP passes.

■半灷量新考

本文对现藏中国国家博物馆的■半灷量器上的铭文重新考释,认为量铭"半灷"当读为"半寸",半寸即半立方寸,为此量的容积。

Statistical and thermodynamic properties of binary self-condensing vinyl polymerization

The thermodynamic properties of a binary self-condensing vinyl polymerization system consisting of monomers and inimers are investigated by the principle of statistical mechanics.In detail,in terms of two types of canonical partition functions constructed from different viewpoints,the equilibrium free energy,the law of mass action and the size distribution of hyperbranched polymers are obtained.As an application,the specific heat,equation of state and isothermal compressibility concerning the polymerization are given as well.To study the dimension of hyperbranched polymers in the system,a recursion formula satisfied by the(k+1)-th and k-th mean square radius of gyration is derived,and then the first,second and third radius of gyration under different solvent conditions are presented.The influences of the fraction of inimers,the conversion of vinyl groups and the solvent effect on the average dimension of hyperbranched polymers are discussed.

Quantum confinement effect of two-dimensional all-inorganic halide perovskites

Quantum confinement effect（QCE）, an essential physical phenomenon of semiconductors when the size becomes comparable to the exciton Bohr radius, typically results in quite different physical properties of low-dimensional materials from their bulk counterparts and can be exploited to enhance the device performance in various optoelectronic applications. Here, taking Cs Pb Br3 as an example, we reported QCE in all-inorganic halide perovskite in two-dimensional（2D） nanoplates. Blue shifts in optical absorption and photoluminescence spectra were found to be stronger in thinner nanoplates than that in thicker nanoplates, whose thickness lowered below -7 nm. The exciton binding energy results showed similar trend as that obtained for the optical absorption and photoluminescence. Meanwile, the function of integrated intensity and full width at half maximum and temperature also showed similar results, further supporting our conclusions. The results displayed the QCE in all-inorganic halide perovskite nanoplates and helped to design the all-inorganic halide perovskites with desired optical properties.

Semileptonic Decays B_c~*→η_cll with QCD Sum Rules

In this article, we calculate the B＊→ηc form-factors with the three-point QCD sum rules, then study the semileptonic decays B＊→ηclυl. The tiny decay widths may be observed experimentally in the future at the LHCb, while the B＊→ηc form-factors can be taken as basic input parameters in other phenomenologieal analysis.