一种基于H.235协议的关守消息认证机制

首先对基于用户秘密散列签名的关守消息认证机制做了简单介绍,然后针对该机制的不足之处提出了一种基于H.235协议的改进方法,具有安全性高,速度快,管理方便等优点.     

砂砾岩储集层含油性解释方法

LJ地区砂砾岩地层具有岩石结构复杂，储集层非均质性强，稠油和稀油并存的特点，利用测井资料解释含油性难度很大，以地层测试资料为依据，综合利用多种测井信息，提取反映含油性变化的测井特征参数；应用测井参数交会法和测井相分析法建立有效，快速识别稠油，油层和水层的标准，测井相分析法消除了用测井单参数和两参数交会解释含油性存在的多解性，提高子解释结果的成功率，用编制的解释软件处理了LJ地区58口井的资料，解释结果与试油资料对比吻合程度较高，为砂岩储层含油性解释提供了一种有效，快速的方法，为该区先导性试验提供了可靠的依据。     

GB 19865 & GB 6675 ANNEX A.A——SAFETY OF ELECTRICAL TOYS Differences Between the new and old Chinese National Standards

This article anlayzes the different requirements for electrical toys safety between GB 6675-2003 and GB19865-2005. This information is summed up in table form to make it easy for toy designers and manufacturers to grasp the new standard.     

信息共享与协同模式在城市综合管理中的应用实践

从城市管理的实际需求出发,结合当前的信息技术,设计和实践了一个大型城市区级综合管理系统.描述了该系统的总体构架、软件功能、信息共享机制和业务协同模式.实践证明,提出和实践的系统平台能够很好地实现已有系统的集成与整合应用.     

AutoCAD ActiveX在圆管带式输送机弯曲段桁架的设计应用

系统地总结分析了圆管带式输送机线路布置的弯曲形式,并着重讨论了利用AutoCAD ActiveX技术来完成转弯段六边形托辊组桁架的设计。     

Full Automated Synthesis of18F-FDOPA and Preliminary PET/CT Imaging

¹⁸F-fluoro-L-dihydroxyphenylalanine (¹⁸F-FDOPA) as a dopamine neurotransmitter imaging agent has been widely used for diagnosis and therapy evaluation of Parkinson's disease, brain tumors and neuroendocrine diseases with positron emission tomography (PET) imaging in clinical setting and research. To meet the increasing clinical demand in oncology and neurology, a routine protocol for the automated synthesis of¹⁸F-FDOPA with a disposable cassette system on an imported multifunctional synthesizer was studied and discussed.¹⁸F-FDOPA was automatically synthesized via a multiple-step reaction, including fluorination, reduction, iodization alkylation and hydrolysis, following purification by using a semi-preparative high-performance liquid chromatography (HPLC) system which was built in the multifunctional synthesizer. After HPLC purification, the purified¹⁸F-FDOPA solution was collected and passed through a sterilizing filter into a collection bottle. The final¹⁸F-FDOPA injection was obtained for quality control (QC) determination. The QC indexes of the final products were detected： the injection was colorless and transparent, pH value was at 4 to 5.5, radiochemical purity >98%, radionuclide purity >99%, specific activity >1.9 GBq/μmol, K_2.2.2 content <50 mg/L, methanol content <0.01%, alcohol content <0.01%, dichloromethane content <0.01 mg/L, dimethylformamide content <15 mg/L, bacterial endotoxin test <0.100 EU/mL, sterility test 0 cfu/mL,and abnormal toxicity test was negative. PET/CT imaging of rats was performed by intravenous injection of¹⁸F-FDOPA half an hour after the intraperitoneal injection of carbidopa, PET/CT scan was performed after 100 min post-injection. The imaging of¹⁸F-FDOPA showed symmetry high uptake in the bilateral striatum of normal rats. The decay-corrected radiochemical yield of¹⁸F-FDOPA from the¹⁸F-fluoride was (63.1±3.8)% (n=10) at the end of synthesis (EOS), the radiochemical purity was no less than 98%, and the total radiosynthesis time was within 80 min. The quality control results demonstrated that the quality indexes of the final injection solution met the relevant requirements of radiopharmaceutlcals, which were well-suited for clinical application. An efficient and high reproducible automatic method for the radiosynthesis of¹⁸F-FDOPA with high radiochemical yields and good radiochemical purity is obtained and performed via a multi-step reaction on the multifunctional synthesizer.¹⁸F-FDOPA can be used for animal and human PET imaging.     

河流相沉积微相与测井相研究

在关键井相分析的基础上，通过研究河流各沉积微相的特征及测井曲线上的呼应特征，建立了河流相各种沉积微相的测井相模式，实现了根据测井资料用计算机定量识别井剖面地地层的沉积微相，并对胜利油田的实际井资料进行了处理，其结果与地质专家解释结果相当吻合。     

Ф101．6mm井分层注水管柱的研制与应用

针对Ф101．6mm套管内径小,采用常规分层注水管柱无法开展投捞调配的问题,研制成功以配水器与封隔器一体化工具和扶正式小直径水力锚为主体的Ф101．6mm井分层注水管柱。这种管柱采用绝对压力自动坐封机构,使管柱下井后直接坐井口注水即可坐封,实现分层注水。该管柱结构简单,密封可靠,有效期长,投捞测试方便,在现场应用25井次,解决了Ф101．6mm套管分层注水的技术难题。     

微管道过流特性实验与仿真研究

本文针对微管道电渗流的控制问题,阐述了电渗泵的原理和数学模型,用有限元方法进行解算,得到了与实验相一致的结果.     

Epoxidized soybean oil-based ceramer coatings

New inorganic/organic hybrid coating containing epoxidized soybean oil were prepared. Three sol-gel precursors [titanium (IV) i-propoxide, titanium (IV) di-i-propoxide bis-acetoacetonate, and zirconium n-propoxide] were utilized as the inorganic phase. Various coating properties, including adhesion, hardness, impact resistance, flexibility and tensile properties, were investigated as a function of sol-gel precursor type and concentration. All ceramer coatings exhibited excellent flexibility and hardness. Tensile strength and hardness increased with sol-gel precursor concentration. A slight decrease in adhesion and impact resistance was observed with increasing precursor content.