射线立体检测中拍片评片位置关系的数学模型

探讨胶片处于复斜位置拍片及其在三维评片仪上测片时建立数学模型的方法．测试结果表明，该方法可以满足工业探伤“三定”分析的要求     

基于神经网络的喘振早期发现

分析并指出了压缩机组防喘振控制系统的缺陷，在此基础上，针对机组发生哮喘振与机组工艺参数间的关系，建立了一个基于神经网络模型喘振预警系统，以帮助现场机组操作人员及早发现喘振。     

Cooperative Mechanism of Supply Chain Under Asymmetric Information

Abstract: The cooperative mechanism is one main issue in the decentralized supply chain system, especially in an asym-metric information structure. We analyze the non-cooperative game behavior of a 2-echelon distribution supply chain,compare the results with the system optimal solution, and give the supplier dominated cooperative mechanisms. We alsoanalyze the validity of our contract under the asymmetric retailers' holding cost information and give some useful conclu-sions.     

再碳化后再碱化钢筋混凝土（水泥砂浆）的电化学研究

为模拟再碱化钢筋混凝土结构的耐久性,对再碱化后的钢筋-砂浆试件进行加速碳化试验,碳化的时间采用试件进行再碱化前第1次碳化所用的时间.采用交流阻抗谱、极化曲线和pH测试等测试方法研究再碳化过程中钢筋电化学和水泥砂浆碱性的变化.试验结果表明:在本试验条件下,再碳化后试件的pH值仍然大于10.00;再碳化后钢筋的腐蚀电流虽然有所增大,但仍小于再碱化前的腐蚀电流密度,钢筋的腐蚀电位负移,但仍大于再碱化前的腐蚀电位.研究结果表明:再碱化后的混凝土结构对CO2具有较好的抵抗侵蚀的作用.     

活性污泥宏基因组Fosmid文库的构建

大插入片段宏基因组文库的构建是开发大片段目的基因及分析其结构与功能的基础.文中分别采用十六烷基三甲基溴化铵(CTAB)法、试剂盒及琼脂糖包埋法提取活性污泥宏基因组DNA,其中琼脂糖包埋法获得的DNA片段大于23kbp,利用此DNA成功构建了以pCC1FOS为载体的Fosmid文库,该文库含有5280个克隆,平均插入片段长度为35～40 kbp,共包含约200 Mbp的宏基因组DNA.从此文库中随机挑选200个克隆,利用活性筛选方法快速筛选到了1个含有淀粉酶的阳性克隆,表明活性污泥Fosmid文库可用于功能基因的活性筛选,具有开发新基因的潜力.     

Leptomeningeal metastasis from central nervous system tumors: A study of classification and stage in the spinal canal of 58 patients

Leptomeningeal metastasis (LM) is caused by the spread of malignant tumor cells into the subarachnoid space.However,classification and staging of LM in the spinal canal is rare in the literature.The authors reviewed the records of 58 Chinese patients with LM for clinical features,neuroimaging,and treatments.Gadolinium-enhanced magnetic resonance imaging (MRI) of brain and spinal cord were performed in all patients.Removal of intracranial tumors was performed in all patients and diagnoses were confirmed by histology.The study group consisted of 58 patients,with 29 cases presenting with intraspinal symptoms.Of the 58,8 patients underwent intraspinal tumor removal,8 received radiotherapy alone,9 received chemotherapy alone,and 34 patients received combined radiochemotherapy.We classified LM into 3 types:type L or leptomeninges LM,is subdivided into 2 subtypes (subtype LI and LII (a,b)),type N or nerve root LM is subdivided into 2 subtypes (subtype NI and NII (a,b)),and type M or mixed-type LM.We also divided LM into stages of I-IV according to the symptoms and the volume of the tumor based on spinal axial MRI.Type LI LM often occurs in patients with intracranial and intraspinal tumors found simultaneously.Patients who receive surgery for intracranial tumors may present with type N LM.Surgery is suitable for patients with NI LM and LIIb LM in stages III-IV,presenting with severe spinal symptoms.The prognosis is better for type N LM than type L LM.     

哈萨克斯坦Z油田中高含水期井网加密调整潜力评价

哈萨克斯坦Z油田于1961年被发现,1967年投入工业开发。油田经过长达50年的开发,已经进入中高含水开发阶段,目前综合含水55. 9%,可采储量采出程度57. 9%。通过深入分析该油田平面接替区块和纵向上的潜力开发层系与组合,结合开发方式,通过研究探测半径与有效渗透率、井网密度与原油采收率、合理井距与净产油量关系及经济极限井距和井网密度的研究,从技术和经济的双重角度论证了油田开发中后期井网加密调整的可行性,明确了下步挖潜的方向并量化了开发调整的潜力,为油田开发调整方案的制定提供依据。