教学课程资源库 更多>>

关键词： 生化检验   肾上腺皮质疾病   诊断   作用  

摘要： 目的：对生化检验在肾上腺皮质疾病诊断中的作用进行探讨。方法资料选自2012年3月-2013年8月在本院治疗肾上腺皮质疾病患者94例。将所有患者随机分为研究组和对照组。其中研究组采用生化检验，对照组采用常规检验，分析两组患者的检验有效率。结果分析两组患者的检查情况，研究组的总有效率为93.62%，高于对照组的80.85%，两组数据的比较差异具有统计学意义（P〈0.05）。结论肾上腺皮质疾病应用生化检验诊断，较为准确，可将其作为疾病的例行检查项目。

关键词： 医院感染   检验科   管理  

摘要： 目的探讨检验科在医院感染管理中所存在的不足,并提出切实可行的防护措施。方法 两家医院检验科从2007年1月-2014年1月共有18名医务人员发生职业危害,采取回顾性研究,设计医院感染情况调查表,把2007年1月-2014年1月期间所出现的职业伤害事件进行分析统计,并把结果填写到调查表中,分析目前医院感染中所存在的危险因素,并根据实际情况制定有效、有针对性的管理措施。结果 2007年1月-2014年1月,两家医院检验科共发生18例医院感染事件,其中吸入性溶胶感染2例（11.1%）,锐气伤导致感染6例（33.3%）,被血液或体液喷溅导致感染9例（50.0%）,其他原因所致医院感染7例（55.6%）。所存在的问题主要有：科内人员防护意识不足、资金投入不足和工作环境不理想等;所制定的措施则有：组织管理、加强防护意识相关培训和强化工作人员的防护等。结论通过强化检验科医院感染危险因素的管理措施,能有效降低医院感染发生率,提高工作人员的安全性,保证医务人员的生命健康。

关键词： 质量检验机构   企业   管理   作用  

摘要： 随着市场经济的快速发展和先进的科学技术的进步,产品质量检验机构在各个方面上都有了全方面的突破,设备上有了当前最先进的科学设备,在管理上,有更先进的管理理念,人员的素质有很大的提升。同时因为企业自身的各方面条件所限,在质量管理的方面存在问题,难以有效的解决。为此本文就针对产品质量检验机构在企业质量管理活动中起到的作用进行分析,希望对企业在质量管理活动中起到帮助,提供参考。

关键词： 贫血   鉴别诊断   血液检验   价值  

摘要： 目的探讨血液检验在贫血鉴别诊断中的作用。方法选取我院2012年1月—2012年12月间收治的不同性质的贫血患者及健康体检者各20例,对所有贫血患者及健康体检者进行血液检验,观察比较贫血患者与健康体检者血液检验的结果。结果与健康体检者相比,地中海、缺铁性、巨幼细胞性、溶血性、慢性感染性贫血患者的平均红细胞体积、平均红细胞血红蛋白量、平均血红蛋白浓度、红细胞分布宽度均出现不同程度的改变。结论血液检验在贫血鉴别诊断中的作用较大,结合患者的血液检验参数与临床症状表现,对准确地鉴别诊断贫血病因具有重要意义。

关键词： 包装印刷材料   国家标准   组成   分类   标准化技术委员会   深圳职业技术学院  

摘要： 据悉，全国印刷标准化技术委员会包装分技术委员会（SAC／TC170／SC3）日前在深圳职业技术学院召开《包装印刷材料分类》国家标准起草组成立会议，正式组建标准起草组。

关键词： 新闻图像   新闻量表   新闻图像作用   社会舆论  

摘要： 新闻图像作用量表能够告诉受众自己为什么受新闻图像影响,以及在哪些方面受到其影响;也可以使新闻图像传播者在传播实践中更有的放矢或规范自己的传播行为。而在此基础上编制的新闻图像作用判定量表则进一步为新闻媒体图像编辑等把关人在选用图像时以及制定图像传播策略时提供具体操作方法。

关键词： autocatalysis   asymmetric amplification   asymmetric catalysis   chirality   origin of homochirality  

摘要： Pyrimidyl alkanol was found to act as an asymmetric autocatalyst in the enantioselective addition of diisopropylzinc to pyrimidine-5-carbaldehyde. Asymmetric autocatalysis of 2-alkynylpyrimidyl alkanol with an extremely low enantiomeric excess (ca. 0.00005% ee) exhibits enormous asymmetric amplification to afford the same compound with >99.5% ee. This asymmetric autocatalysis with amplification of ee has been employed to examine the validity of proposed theories of the origins of homochirality. Circularly polarized light, quartz, sodium chlorate, cinnabar, chiral organic crystals and spontaneous absolute asymmetric synthesis were considered as possible candidates for the origin of chirality;each could act as a chiral source in asymmetric autocatalysis. Asymmetric autocatalysis can discriminate the isotope chirality arising from the small difference between carbon (carbon-13/carbon-12) and hydrogen (D/H) isotopes. Cryptochiral compounds were also discriminated by asymmetric autocatalysis.

关键词： machine learning   maximum likelihood classification   logistic regression   support vector machine   tree classifiers   random forests  

摘要： Although a large number of new image classification algorithms have been developed, they are rarely tested with the same classification task. In this research, with the same Landsat Thematic Mapper (TM) data set and the same classification scheme over Guangzhou City, China, we tested two unsupervised and 13 supervised classification algorithms, including a number of machine learning algorithms that became popular in remote sensing during the past 20 years. Our analysis focused primarily on the spectral information provided by the TM data. We assessed all algorithms in a per-pixel classification decision experiment and all supervised algorithms in a segment-based experiment. We found that when sufficiently representative training samples were used, most algorithms performed reasonably well. Lack of training samples led to greater classification accuracy discrepancies than classification algorithms themselves. Some algorithms were more tolerable to insufficient (less representative) training samples than others. Many algorithms improved the overall accuracy marginally with per-segment decision making.

关键词： High-pressure processing   packaging   headspace   crystallinity   polymer  

摘要： As high-pressure processing is used increasingly for the treatment of packed products, different packaging has been investigated with respect to their structural behaviour and stability under high-pressure processing. Often, failures and changes of the polymeric structure occur. Common damage symptoms of high-pressure-treated packaging materials are defined and classified in this review. These damage symptoms are allocated to the physico-chemical effects that created them. The effects may be separated into direct effects induced by the action of the high-pressure alone and indirect effects that are mediated via compressed contents of the package, i.e. filled product and gaseous headspace. The direct effects split up again in reversible and irreversible structural changes. The indirect effects are generated by compressed headspace gases, other compressed substances and the consequences of increased amounts of gases dissolved in the polymers. If applicable, current theoretical approaches have been allocated to the different categories of damage. Copyright ? 2013 John Wiley & Sons, Ltd.

关键词： Support vector machines   Neural networks   Oral malodor classification  

摘要： Objective: This study presents an effective method of classifying oral malodor from oral microbiota in saliva by using a support vector machine (SVM), an artificial neural network (ANN), and a decision tree. This approach uses concentrations of methyl mercaptan in mouth air as an indicator of oral malodor, and peak areas of terminal restriction fragment (T-RF) length polyrnorphisms (T-RFLPs) of the 16S rRNA gene as data for supervised machine-learning methods, without identifying specific species producing oral malodorous compounds. Methods: 1 6S rRNA genes were amplified from saliva samples from 309 subjects, and T-RFLP analysis was carried out with the DNA fragments. T-RFLP analysis provides information on microbiota consisting of fragment lengths and peak areas corresponding to bacterial strains. The peak area is equivalent to the frequency of a specific fragment when one molecule is selected from terminal fragments. Another frequency is obtained by dividing the number of species-containing samples by the total number of samples. An SVM, an ANN, and a decision tree were trained based on these two frequencies in 308 samples and classified the presence or absence of methyl mercaptan in mouth air from the remaining subject. Results: The proportion that trained SVM expressed as entropy achieved the highest classification accuracy, with a sensitivity of 51.1% and specificity of 95.0%. The ANN and decision tree provided lower classification accuracies, and only classification by the ANN was improved by weighting with entropy from the frequency of appearance in samples, which increased the accuracy to 81.9% with a sensitivity of 60.2% and a specificity of 90.5%. The decision tree showed low classification accuracy under all conditions. Conclusions: Using T-RF proportions and frequencies, models to classify the presence of methyl mercaptan, a volatile sulfur-containing compound that causes oral malodor, were developed. SVM classifiers successfully classified the presence