生产尾管固井技术优化及其在渤中25-1油田中深丛式井的应用

渤中25-1油田沙河街组油藏属于中深层高温高压油藏,制约了常规尾管固井技术的应用。对生产尾管固井技术进行了优化,解决了中深丛式井生产尾管固井作业安全、质量与时效之间的矛盾,实现了非钻机时间候凝和电测固井质量,显著提高了钻井作业时效。该项技术成果对于渤海中深层油田的开发具有重要意义。     

ISDN PBX及X.25网关的管理

本文介绍了ＩＳＤＮ用户一网络接口的管理模型，分析了ＰＢＸ、Ｘ．２５网关的管理功能，对协议测试，管理通信进行了研究并提出模型及实现原则。     

热强钛合金BT25组织与性能

介绍了前苏联航空发动机用热强钛合金（或高温钛合金）BT25的发展概况，并对BT25合金的成分特点、热处理强化优点等做了进一步阐述，给出了退火状态下的物理性能，在说明热强钛合金微观组织与力学性能关系的基础上给出了BT25合金的各种力学性能。     

氢对2.25Cr-1Mo压力容器用钢力学性能影响

基于试样高温高压釜充氢方法 ,研究了氢对 2 2 5Cr 1Mo压力容器用钢力学性能的影响。对充氢前后的试样进行了拉伸和CVN冲击试验 ,结果表明 ,氢对 2 2 5Cr 1Mo钢的拉伸力学性能和冲击韧性影响不显著。     

An efficient algorithm for characteristic tracking on two-dimensional triangular meshes

Tracking characteristics on unstructured meshes is an important part of many numerical methods in computational fluid mechanics. In this paper, we propose an efficient algorithm for characteristic tracking on two-dimensional unstructured triangular meshes. Numerical experiments, including an example for applying this algorithm with the Eulerian-Lagrangian localized adjoint method (ELLAM) to solve a convection-dominated convection-diffusion problem, are presented to demonstrate the efficiency of this algorithm.     

mRNA and miRNA Expression Analyses of the MYC/E2F/miR-17-92 Network in the Most Common Pediatric Brain Tumors

Numerous molecular factors disrupt the correctness of the cell cycle process leading to the development of cancer due to increased cell proliferation. Among known causative factors of such process is abnormal gene expression. Nowadays in the light of current knowledge such alterations are frequently considered in the context of mRNA–miRNA correlation. One of the molecular factors with potential value in tumorigenesis is the feedback loop between MYC and E2F genes in which miR-17-5p and miR-20a from the miR-17-92 cluster are involved. The current literature shows that overexpression of the members of the OncomiR-1 are involved in the development of many solid tumors. In the present work, we investigated the expression of components of the MYC/E2F/miR-17-92 network and their closely related elements including members of MYC and E2F families and miRNAs from two paralogs of miR-17-92: miR-106b-25 and miR-106a-363, in the most common brain tumors of childhood, pilocytic astrocytoma (PA), WHO grade 1; ependymoma (EP), WHO grade 2; and medulloblastoma (MB), WHO grade 4. We showed that the highest gene expression was observed in the MYC family for MYCN and in the E2F family for E2F2. Positive correlation was observed between the gene expression and tumor grade and type, with the highest expression being noted for medulloblastomas, followed by ependymomas, and the lowest for pilocytic astrocytomas. Most members of miR-17-92, miR-106a-363 and miR-106b-25 clusters were upregulated and the highest expression was noted for miR-18a and miR-18b. The rest of the miRNAs, including miR-19a, miR-92a, miR-106a, miR-93, or miR-25 also showed high values. miR-17-5p, miR-20a obtained a high level of expression in medulloblastomas and ependymomas, while close to the control in the pilocytic astrocytoma samples. miRNA expression also depended on tumor grade and histology.     

25Cr2Ni4MoV钢转子轴颈损伤修复工艺研究

汽轮发电机运行过程中,转子轴颈磨损拉伤的情况较为普遍,采用微弧冷焊技术可以实现对损伤部位的修复。针对25Cr2Ni4MoV材料转子,通过焊接工艺试验和试样性能检测,得到一种可靠的微弧冷焊工艺;并通过对焊缝无损检测标准和焊后尺寸恢复工艺的研究,形成了一套完善的轴颈损伤修复工艺方案。     

晶界碳化物对Fe-Cr15-Ni25合金蠕变裂纹扩展行为的影响SCIEI

在两种不同晶界状态下研究了Fe-Cr15-Ni25合金的蠕变裂纹扩展行为。单相合金的空洞在晶界三叉点处形核,而对晶界上有碳化物析出的合金,空洞在晶界碳化物上形核。晶界碳化物阻碍了空洞的长大和连接,因而大大提高了蠕变裂纹扩展抗力。     

ZG3Cr18Ni25Si2耐热钢熔炼工艺的改进

介绍了改进后的ZG3Cr18Ni25Si2耐热钢熔炼工艺及特点，它具有较高的合金元素收得率，铸件的使用寿命比改进前延长了35％－45％。     

基于KL25单片机的直流电机控制电路及编程

介绍了一种基于KL25单片机和场效应管组成的直流电机控制电路和相应的控制程序设计。该电路采用32位M0+单片机、CD4504电压转换芯片、编码器、IRF4905和IRF3205场效应管,通过PID算法实现了直流电机的闭环控制,具有工作电流大、控制精度高、稳定可靠和自我保护等特点,在全国Freescale智能车比赛中得到应用,效果良好。