射孔优化技术在涠洲油田的应用

射孔完井是油气田勘探开发过程中不可缺少的环节,对油气井产能影响很大。通过对射孔完井对产能影响机理的深入研究,找出了各种射孔参数对油气井产能影响的规律。结合涠洲油田的特点,以WZ2井为例分析确定了射孔优化所需的敏感参数,结合射孔工艺、地层条件和开发目的等实际情况,形成了一套科学系统的射孔方案优化设计方法;最终给出涠洲油田开发井的射孔优化设计方案,并对应用效果进行了分析,说明了射孔优化设计在提高油气井产能中所起的作用。     

基于波长转换技术的一种低成本WDM-EPON方案

提出了一种新的波分复用以太网无源光网络(WDM-EPON)方案.该方案基于注入锁模和波长转换技术,可以重用现有EPON网络中的光网络单元(ONU),实现了由EPON向WDM-EPON的平滑升级.系统中,使用工作在注入锁定模式的FP激光器输出作为波长转换节点的输入探测光,显著降低了成本.仿真实验验证了这种低成本WDM-PON方案及其在升级应用中的可行性.     

铟铈铜铌酸锂晶体光谱特性及抗光损伤能力

在铌酸锂LiNbO3(LN)中掺入0.1 mol%CeO2,0.1 mol%CuO和0.5 mol%、1 mol%和1.5 mol%In2O3,用Czochralski技术生长In:Ce:Cu:LN晶体.利用Avatar-360型FT-IR红外光谱仪测试了晶体的红外光谱,发现In(3 mol%):Ce:Cu:LN晶体的OH-吸收峰由LN的3 484 cm-1移到3 508 cm-1.利用WFZ-26A型紫外.可见光分光分度计测试了晶体的紫外可见光谱,发现当In掺量小于3 mol%时.随In掺量的增加,基础吸收边向短波方向移动,即发生紫移,在掺入量达到3 mol%时,基础吸收边红移.采用透射光斑畸变法测试了晶体的抗光损伤能力,结果表明:In(3 mol%):Ce:Cu:LN晶体的抗光损伤能力比其他样品明显增强,较Ce:Cu:LN晶体的抗光损伤能力高出两个数量级.探讨了In:Ce:Cu:LN晶体OH-吸收峰及基础吸收边移动和抗光致散射能力增强的机理.     

Experimental hepatobiliary fascioliasis in rabbits: a radiology-pathology correlation

RATIONALE AND OBJECTIVES: The authors sought to correlate the radiologic findings of hepatobiliary fascioliasis with pathologic features. METHODS: Serial ultrasound, computed tomography (CT), and magnetic resonance findings in seven rabbits with experimentally induced fascioliasis were obtained every other week. Direct cholangiogram was also obtained after the rabbits were killed. Radiology-pathology correlation was done in specimens. RESULTS: In the parenchymal phase (an acute phase of parenchymal invasion of a larva), CT showed subcapsular clustered areas of low attenuation. Magnetic resonance appearance was similar in shape but better than CT in characterizing the hemorrhagic nature of the lesion. Ultrasound findings were nonspecific in this phase. In the ductal phase (a stationary phase after residing in the bile duct), CT showed dilatation of central ducts with symmetric periportal hypoattenuation (periportal tracking). Magnetic resonance could not depict mild ductal dilatation. Ultrasound was most valuable in demonstrating the moving worm within the dilated duct. Pathologically, the hepatic parenchymal lesions consisted of a cluster of eosinophilic granulomas with hemorrhagic change (migratory tract of the flukes). Ductal changes were observed predominantly in the central bile ducts. Periportal lymphangiectasia was also noted. CONCLUSIONS: Computed tomography or magnetic resonance can demonstrate the characteristic evolutionary pattern of fascioliasis that reflects the unique life cycle of Fasciola hepatica. The role of ultrasound, although limited in the parenchymal phase, was most useful in the ductal phase in that it demonstrated the moving worms themselves.     

布局物联网 研华志做智能地球推手

<正>随着物联网概念的持续升温,越来越多的厂商将物联网领域纳入自己的发展蓝图。研华公司的发展规划中,物联网是重要的一项战略布局,并且致力于推动整个物联网产业的发展和深耕。在刚刚结束的2010年中国国际工业博览会工业自     

一种低成本解调系统的双光栅电压传感器

设计了一种由2×2和3×3耦合器构成的M-Z干涉仪，并成功应用到所设计的光纤光栅电压传感器解调中。与其他电子式、光学电压传感器相比较，基于2×2和3×3耦合器构成的M-Z干涉仪解调的光纤光栅电压传感器系统结构简单、价格优廉。此系统通过2根不同波长的光纤光栅分别对温度和电压进行测量。测量结果表明，此系统在50 V到450 V之间线性度比较好，消除了光纤光栅温度交叉敏感的问题，使得测量的结果更加准确，能够满足电力系统测量的要求。     

剩余价值理论应当结合实践注入新的内容

本文从现实出发，对剩余价值生产领域、生产主体、生产范围及剩余价值的载体进行了论述。提出马克思主义剩余价值理论在新的历史条件下应结合实践注入新的内容。     

Autoran病毒原理分析及设计与实现

Autorun病毒是一种具有代表性的常见病毒,是通过Autorun.inf文件进行传播。利用W indows的自动运行功能在打开U盘的同时自动运行Autorun盘病毒。详细分析了基于Autorun的计算机病毒原理,并根据Autorun病毒的原理设计了一个病毒程序,且提出了解决该病毒的预防方法和删除方法。     

Incidence of primary malignancies other than breast cancer among women treated with radiation therapy for benign breast disease

In addition to left ventricular pump failure and low cardiac output, structural and metabolic alterations of skeletal muscle are thought to contribute to exercise intolerance seen in patients with CHF. Studies using cardiac myocytes have implicated nitric oxide elaborated by inducible nitric oxide synthase (iNOS) as a potential agent associated with the genesis of dilated cardiomyopathy. The present study was designed to locate iNOS in the working skeletal muscle of patients with congestive heart failure. Specific antibodies were used to detect iNOS by immunohistochemistry in skeletal muscle biopsies (m. vastus lateralis) of 37 patients with left ventricular pump failure and 8 normal controls. The expression was restricted to skeletal muscle myocytes and was increased five- to ninefold in patients with chronic heart failure. There was no statistically significant difference in iNOS expression between patients with dilated cardiomyopathy and those with ischemic cardiomyopathy. The finding of a locally increased expression of iNOS and the experimental evidence that NO attenuates the contractile performance of the skeletal muscle suggest that the expression of iNOS may be responsible for the exercise intolerance seen in patients with chronic heart failure.