抽油杆接头加工方法探讨

讨论了石油采油中抽油杆接头加工中的装夹定位方法与保证加工精度和效率的措施，并结合工艺过程确定了相关尺寸和检测要求相匹配的尺寸。     

半导体二极管γ瞬时辐射效应

本文研究了半导体二极管瞬时电离辐射效应,给出了在闪光X射线机上的试验结果。     

定向凝固镍基高温合金的塑性变形与γ′相中的位错结构

本文利用透射电镜观察了定向凝固高温合金DS Rene80在拉伸及蠕变时的位错亚结构。试验结果表明:在低于760℃拉伸时,切割γ′粒子的是在{111}面上夹有APB的(1/2)〈110〉位错对。在不低于760℃拉伸时,切割γ′粒子的是在{111}面上夹有超点阵内禀层错(SISF)γ(1/3)〈112〉不全位错;这些不全位错在大应力的作用下于{111}面上将分解为一根(1/2)〈110〉螺位错和一根(1/6)〈112〉刃位错,并在其间夹有一个APB。在760℃,618MPa条件下蠕变时,切割γ′粒子的是在{111}面上夹有SISF的(1/3)〈112〉不全位错;这些不全位错此时不分解。与此同时,亦有(1/2)〈110〉位错对切割γ粒子。在980℃,190MPa条件下蠕变时,则无γ′粒子被切割的现象。在760℃,618MPa及980℃,190MPa条件下蠕变至第二阶段时,在γ/γ′界面上都形成了二维位错网络墙,墙上位错的攀移是合金形变的控制因素。第二阶段蠕变速率(ε)与立方γ′粒子的尺寸(α)和体积分数(V_f)的关系符合ε∝α/V_f~(2/3)     

AT89C2051在包装机小包张口检测系统中的应用

本文以自行开发的检测系统为例,介绍以AT89C2051单片机为中央处理器,在GD1、GD2包装机生产过 程中出现的翘边、张口、破包、白包等破损单包香烟进行在线检测、跟踪剔除及统计损包数量的应用。     

基于NT Server 4.0和BackOffice的Internet/Intranet实现方案

介绍了以MicrosoftNTServer4．0和MicrosoftBackOffice产品为基础实现企业Internet／Intranet的方案和实例．     

Two new nickel(II) complexes: Synthesis and third-order optical nonlinearity

Two new nickel(II) complexes were synthesized and characterized by UV, MS and elemental analysis. Their off-resonant third-order nonlinear optical properties were measured using femtosecond laser and degenerate four-wave mixing technique. The third-order nonlinear optical susceptibilities χ⁽³⁾ are 3.38 × 10^?13 esu and 3.64 × 10^?13 esu. The nonlinear refractive index n₂ are 6.22 × 10^?12 esu and 6.70 × 10^?12 esu. The second-order hyperpolarizabilities γ of the molecules are 3.38 × 10^?31 esu and 3.65 × 10^?31 esu. The response times are 61 fs and 74 fs. The results show that the two complexes have potential nonlinear optical applications.     

Magnetocaloric effect of La0.8Ce0.2Fe11.4−xMnxSi1.6 compounds

The effect of Mn addition on the magnetocaloric effect (MCE) of the La_0.8Ce_0.2Fe_11.4?xMn_xSi_1.6 (x = 0.0, 0.1, 0.2, 0.3) compounds was investigated. It was revealed that the transition temperatures of the compounds are sensitive to Mn composition. The temperatures are shifted from 177 to 121 K for Mn composition from 0.0 to 0.3. Moreover, thermal lag and magnetic hysteresis loss of the compounds are reduced largely due to Mn addition. A good MCE with a large and almost constant refrigerant capacity in a large temperature span over 50 K was achieved in the investigated compounds. The investigated compounds are promising magnetic entropy change materials.     

武钢四烧建设的回顾与总结

武钢四烧是国内技术含量最高的烧结工厂之一，其特点是设备大型化、国产化、自动化程度高、工艺完善。建设中投资控制有效，管理科学，质量优良，投产顺利。     

固定转化器泄漏原因分析

采用化学、金相分析方法，结合腐蚀的基本原理，对热交换器的泄漏进行了综合分析，认为造成泄漏的主要原因是循环水中存在大量的氯离子，破坏了蚀剂的保护作用。致使管子产生曜慢穿洞泄漏。     

Cooling precipitation and strengthening study in powder metallurgy superalloy U720LI

The excellent mechanical properties of powder metallurgy (P/M) superalloys strongly depend on the microstructure, such as grain size, and morphology and size distribution of the γ’ precipitates. The microstructure is, in turn, determined by the heat treatment, viz., solution annealing, quenching, and subsequent aging. To study the effect of the quenching process, two types of quenching methods were used to produce different quenched microstructures in a UDIMET 720LI (U720LI) alloy. One was a continuous quenching method, where samples were colled along linearly controlled cooling profiles, each at a fixed cooling rate. This test studied the effect of cooling rate on the size of cooling γ’ precipitates (formed during quenching) and the consequent strengthening effect. The other test was the interrupted quenching test, which allowed tracking the growth of cooling γ’ precipitates with decreasing temperature during quenching at a given cooling rate. The strengthening response at each interrupt temperature was also studied. Results from the continuous cooling tests showed that the relationship between the size of the cooling γ’ precipitate and the cooling rate obeys a power law, with an exponential being about 0.35. The tensile strength was found to increase linearly with the cooling rate. Strengthening due to the subsequent aging treatment occurred regardless of cooling rates. The interrupted cooling tests showed that γ’ growth is a linear function of decreasing temperature for a given cooling rate. A nonmontonic degradation of tensile strength against interrupt temperature was discovered.