浅谈财务出纳管理信息系统的开发

通过对财务出纳管理信息系统的开发，讲述软件开发在实际工作中的重要作用。     

一种汽车空调控制器数据处理系统的设计

针对汽车空调控制器稳定性分析的需求,开发了一种空调控制器数据处理系统,使用Python语言对空调出风口温度性能曲线进行趋势提取以及数据分析,并通过Laravel框架搭建Web应用网站,实现对Python脚本的调用。工程师只需要通过网站上传测试数据,即可准确快速地得到可视化的图表结果,提升了空调控制器数据处理的效率。     

基因表达谱芯片技术筛选乙型肝炎病毒核心蛋白结合蛋白基因C1反式调节基因

目的对未知功能基因C1转染人肝母细胞瘤细胞系(HepG2)后的基因表达谱进行分析,探索该基因的表达对肝细胞基因表达谱的影响及其可能的调节功能线索。方法以分子生物学技术构建C1的真核表达载体pcDNA3.1(-)-C1,以表达质粒pcDNA3.1(-)-C1转染HepG2细胞,空载体pcDNA3.1(-)为平行对照,制备转染后的细胞裂解液,提取mRNA,逆转录为cDNA。应用基因表达谱芯片技术对差异表达的mRNA进行检测和分析。结果HepG2细胞经转染C1表达质粒后,有26条差异表达基因,其中24条基因表达水平下调,2条基因表达水平上调。这些差异表达的基因与细胞信号转导、凋亡、细胞增生分化及肿瘤的发生密切相关。结论应用基因表达谱芯片成功筛选了C1转染细胞后差异表达基因,为进一步阐明C1蛋白可能的生物学功能及乙型肝炎病毒核心蛋白的致病机制提供了理论依据。     

CB和MMP-9在上皮性卵巢肿瘤中的表达及相关性研究

目的检测组织蛋白酶B(cathepsin B,CB)与基质金属蛋白酶9(matrix metalloproteinase-9,MMP-9)在人类上皮性卵巢肿瘤中的表达,探讨两者与卵巢癌细胞的分化增殖、侵袭转移的关系。方法采用链霉素亲和生物素-过氧化物酶法(SP)进行免疫组织化学染色,用CB抗体、MMP-9抗体标记上皮性卵巢肿瘤组织标本,综合染色强度和阳性细胞占总体细胞数的百分比进行染色判定,结合有关病理特征进行分析。结果经统计学分析,CB、MMP-9在上皮性卵巢癌中的表达与年龄、病理类型无相关性(P>0.05),而与卵巢癌的临床分期、有无转移及腹水呈正相关(P<0.05);CB与卵巢癌的组织学分级呈正相关(P<0.05);上皮性卵巢癌中CB和MMP-9表达呈正相关(r=0.652,P<0.05)。结论CB、MMP-9与卵巢癌的恶性生物学行为密切相关,两者在其侵袭转移过程中发挥了重要的协同作用。     

自硬树脂砂ZH25叶片式振动混砂机的设计

本文对自硬树脂砂叶片式振动混砂机进行了详细的理论计算,并通过公式推导确定了振动混砂机的极限振次.制造的样机基本达到设计要求,且已通过鉴定.     

Classification decision tree algorithm assisting in diagnosing solitary pulmonary nodule by SPECT/CT fusion imaging

Objective To develop a classification tree algorithm to improve diagnostic performances of 99mTc-MIBI SPECT/CT fusion imaging in differentiating solitary pulmonary nodules (SPNs). Methods Forty-four SPNs, including 30 malignant cases and 14 benign ones that were eventually pathologically identified, were included in this prospective study. All patients received 99Tcm-MIBI SPECT/CT scanning at an early stage and a delayed stage before operation. Thirty predictor variables, including 11 clinical variables, 4 variables of emission and 15 variables of transmission information from SPECT/CT scanning, were analyzed independently by the classification tree algorithm and radiological residents. Diagnostic rules were demonstrated in tree-topology, and diagnostic performances were compared with Area under Curve (AUC) of Receiver Operating Characteristic Curve (ROC). Results A classification decision tree with lowest relative cost of 0.340 was developed for 99Tcm-MIBI SPECT/CT scanning in which the value of Target/Normal region of 99Tcm-MIBI uptake in the delayed stage and in the early stage, age, cough and specula sign were five most important contributors. The sensitivity and specificity were 93.33% and 78. 57e, respectively, a little higher than those of the expert. The sensitivity and specificity by residents of Grade one were 76.67% and 28.57%, respectively, and AUC of CART and expert was 0.886±0.055 and 0.829±0.062, respectively, and the corresponding AUC of residents was 0.566±0.092. Comparisons of AUCs suggest that performance of CART was similar to that of expert (P=0.204), but greater than that of residents (P<0.001). Conclusion Our data mining technique using classification decision tree has a much higher accuracy than residents. It suggests that the application of this algorithm will significantly improve the diagnostic performance of residents.     

舰船大容量变压器励磁涌流的故障识别

舰船电力系统已经逐步由传统的低压电力系统过渡到中压电力系统,变压器在舰船电力系统中地位和作用也日益凸现,对变压器的保护也日益重要,尤其是在发生短路故障时,迅速可靠的跳闸,是保证变压器安全的重要手段。大容量变压器的内部短路故障主要依靠差动保护,而励磁涌流往往会引起差动保护误动作,因此如何快速识别励磁涌流是确保变压器安全可靠的前提条件。     

透过港口看经济

港口是经济运行的"晴雨表",它们完成了全国近七成的外贸出口量,上下游有数以千万计的外贸企业和市场,透过它们,触摸经济脉搏。港口是经济运行的"晴雨表",记者近日走访上海港、宁波港、苏州港、广州港、连云港港等五大港口,透过这些"窗口",触摸经济脉搏。港口:"以前是船等码头,眼下是码头等船"苏州港地处长江入海口咽喉地带,以3.8亿吨的年货     

我国会计电算化的现状及对策

进入21世纪以来,随着经济全球化趋势的不断发展,我国经济发展日新月异,会计电算化已经成为企业经济管理系统的重要组成部分,在国民经济各个部门的应用日益普及。但在我国会计电算化高速发展的同时,也不可避免地出现了一些问题,本文就我国目前会计电算化发展的现状作出分析,并就这些问题提出切实可行的对策。     

热水夹套的配管设计与管件选用原则

化工装置中,对于黏稠和对热敏感的工艺介质选用热水夹套进行加热能达到良好的伴热效果.鉴于热水夹套管在设计和施工过程中的复杂性,夹套管在配管设计中要注意内外管尺寸选用、供热长度、柔性设计等设计原则,要保证热水的流动畅通,还要注意材质的选择.设计过程中,还应遵循弯头、三通、异径管、法兰、阀门、导向板、隔断板等管件的选用原则....