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血小板相对变化度与脓毒症患者病情严重程度及预后的关系 被引量:6
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作者 潘思梦 刘玉静 +4 位作者 贺黉裕 郑毅隽 诸杜明 罗哲 居旻杰 《中国临床医学》 2017年第2期286-289,共4页
目的:探讨外周血血小板计数的变化度与脓毒症患者病情及预后的关系。方法:收集2015年3月至2016年6月复旦大学附属中山医院重症医学科(ICU)收治的102例脓毒症患者的相关临床资料。比较血小板相对变化度高低患者相关临床特征的差异,分析... 目的:探讨外周血血小板计数的变化度与脓毒症患者病情及预后的关系。方法:收集2015年3月至2016年6月复旦大学附属中山医院重症医学科(ICU)收治的102例脓毒症患者的相关临床资料。比较血小板相对变化度高低患者相关临床特征的差异,分析血小板相对变化度与病情严重程度及患者死亡率的关系。结果:患者的血小板相对变化度与患者入ICU时的急性生理与慢性健康评分Ⅱ(r=-0.397,P<0.001)、脓毒症相关性器官功能衰竭评分(r=-0.317,P=0.001)评分负相关。多因素回归分析显示,血小板相对变化度是脓毒症患者ICU死亡的独立预测因素(OR=0.174,95%CI 0.040~0.758,P=0.02)。结论:脓毒症患者外周血血小板计数的变化程度能较好地反映疾病严重程度,且与患者ICU死亡率密切相关。 展开更多
关键词 脓毒症 血小板计数 相对变化度 死亡率
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基于模态柔度相对变化量的结构损伤识别
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作者 刘天怡 彭凯 《山西建筑》 2010年第10期63-64,共2页
介绍了支持向量机的分类算法,构造了基于模态柔度相对变化量的损伤识别指标,并将此指标作为支持向量机的特征参数进行训练和结构的损伤识别,通过对简支梁仿真计算及试验结果表明:支持向量机对结构损伤的识别有着良好的抗噪性能,该方法... 介绍了支持向量机的分类算法,构造了基于模态柔度相对变化量的损伤识别指标,并将此指标作为支持向量机的特征参数进行训练和结构的损伤识别,通过对简支梁仿真计算及试验结果表明:支持向量机对结构损伤的识别有着良好的抗噪性能,该方法对梁的损伤位置有较高的识别能力。 展开更多
关键词 支持向量机 结构损伤识别 模态柔相对变化 抗噪性能
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Effect of Forging Ratio on Microstructure of the of the 1.5710 Grade Steel
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作者 Greger Miroslav Michal Madaj +1 位作者 Petrzela Jiri Laszlo Vladimir 《Journal of Mechanics Engineering and Automation》 2015年第8期454-458,共5页
Intensity of structural changes during forging is usually determined in dependence on the forging ratio. Forging ratio at elongation is most often calculated with use of simple relations, which are based on the change... Intensity of structural changes during forging is usually determined in dependence on the forging ratio. Forging ratio at elongation is most often calculated with use of simple relations, which are based on the change of cross section of the forged pieces. The intensity of structure development is influenced not only by the simple change of cross sections, but also by relative length of the stroke, magnitude of deformation in individual passes, manner of edging, temperature, friction and shape of anvils. The paper gives an analysis of influence of the relative length of the stroke on the forging ratio. 展开更多
关键词 FORGING relative length of the stroke forging ratio.
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Thermal and Textural Changes of Turkish Delight with Storage Relative Humidity
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作者 Sevim Kayat Gokce Ozkaleli Tattan 《Journal of Food Science and Engineering》 2017年第4期186-191,共6页
Lokum (Turkish delight) is a high sugar and starch containing food. Since the major deterioration factor affecting the storability of lokum is moisture gain or loss, the effect of the possible ambient conditions (3... Lokum (Turkish delight) is a high sugar and starch containing food. Since the major deterioration factor affecting the storability of lokum is moisture gain or loss, the effect of the possible ambient conditions (32%, 53%, 75% RH and 15, 25, 35 ℃) on weight change and firmness of tokum was determined to estimate its structural changes. The variations in thermal properties of lokurn samples stored at different RH (32, 53, 65, 75, and 85% RH) were also determined. Increasing RH decreased glass transition of lokum samples, and two glass transitions (Tg) were observed at 75 and 85% RH. The presence of the second Tg could be related with phase separation which was increased with increasing moisture content and RH. Lokum should be kept at around 50% RH and 15℃, higher storage RH's and temperatures will cause the product to become unacceptable by the consumer within 20 days. 展开更多
关键词 FIRMNESS glass transition temperature lokum texture.
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Analysis of long-term variations of fog and haze in China in recent 50 years and their relations with atmospheric humidity 被引量:80
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作者 DING YiHui LIU YanJu 《Science China Earth Sciences》 SCIE EI CAS 2014年第1期36-46,共11页
Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years (from 196l to 2011) shows that the number of fog days has experienced two-stage variations, with an increasing ... Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years (from 196l to 2011) shows that the number of fog days has experienced two-stage variations, with an increasing trend before 1980 and a decreasing trend after 1990. Especially, an obvious decreasing trend after 1990 can be clearly seen, which is consistent with the decreas- ing trend of the surface relative humidity. However, the number of haze days has demonstrated an increasing trend. As such, the role of reduction of atmospheric relative humidity in the transition process from fog into haze has been further investigated. It is estimated that the mean relative humidity of haze days is about 69%, lower than previously estimated, which implies that it is more difficult for the haze particles to transform into fog drops. This is possibly one of the major environmental factors leading to the reduction of number of fog days. The threshold of the relative humidity for transition from fog into haze is about 82%, also lower than previously estimated. Thus, the reduction of the surface relative humidity in China mainly due to the in- crease of the surface temperature and the saturation specific humidity may exert an obvious impact on the environmental con- ditions for the formations of fog and haze. In addition, our investigation of the relationship between haze and visibility reveals that with the increase of haze days, the visibility has declined markedly. Since 1961, the mean visibility has dropped from 4-10 to 2-4 kin, about a half of the previous horizontal distance of visibility. 展开更多
关键词 fog and haze VISIBILITY relative humidity transition from fog into haze
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Nighttime peroxy radicals chemistry at Rishiri Island during the campaign RISFEX 2003
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作者 LIU Yan WANG JiangTao +4 位作者 WANG ZhuQing GONG XiaoDong YANG Bing TAN LiJu QI Bin 《Science China Chemistry》 SCIE EI CAS 2012年第11期2450-2461,共12页
Peroxy radicals (ROx) concentrations were measured by Peroxy Radical Chemical Amplifier (PERCA) technique during the field campaign RISFEX 2003 (RiShifi Fall Experiment 2003), which was performed in September 20... Peroxy radicals (ROx) concentrations were measured by Peroxy Radical Chemical Amplifier (PERCA) technique during the field campaign RISFEX 2003 (RiShifi Fall Experiment 2003), which was performed in September 2003 at Rishiri island (45.07 N, 141.12 E, and 35 m asl) in the sea of Japan. The concentrations of nighttime ROx radicals had temporal variations around an average of 7.9±5.8 (1σ) pptv and showed a positive correlation with the summed mixing ratio of four monoterpene species. Model calculations suggested that local nighttime ROx radicals were dominated by the reactions of monoterpene with ozone (03) and nitrate radical (NO3), contributing ca. 76% and 19%, respectively. The comparisons between the observed ROx and ones modeled had implied that the current model may be overestimated the yields of peroxy radicals from the reactions of monoterpenes with ozone and an important source of peroxy radicals was possibly missed. Abnormal high concentrations of observed ROx radicals were found during high relative humidity (RH) period (especially 〉 95%), and the possible explanation was that the humidity correction of ROx radicals under high RH conditions may be inaccurate and overestimates ROx concen- 展开更多
关键词 peroxy radicals nighttime chemistry MONOTERPENE OZONOLYSIS humidity correction
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