Pure K2Ti4O9 whiskers were prepared by KDC（Kneading-Drying-Calcination） method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio（RT/K）, calcination temperature（TC） and cooling proces...Pure K2Ti4O9 whiskers were prepared by KDC（Kneading-Drying-Calcination） method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio（RT/K）, calcination temperature（TC） and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC（thermo gravimetric-differential scanning calorimeter）, XRD（X-ray diffraction）, and SEM（scanning electron microscope）. Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio（r）（over 250） can be obtained at RT/K = 2.9 and TC = 950 ℃.展开更多
Monthly fishery survey data of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea from2003 and 2013 were employed to evaluate the variation in the resource distribution and biological character...Monthly fishery survey data of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea from2003 and 2013 were employed to evaluate the variation in the resource distribution and biological characteristics（especially body length and sex ratio） in the population on a decadal scale.The results indicated that the small yellow croaker migrated from the Shawai fishing ground to the Dasha fishing ground in spring and was mainly distributed in the central and western parts of the Dasha fishing ground in April and May.Larimichthys polyactis in the Dasha fishing ground migrated eastward to offshore wintering grounds in autumn and reached the central Dasha fishing ground in October and November.The small yellow croaker entered the western waters of the Shawai fishing ground in winter.A large number of age 0＋ fish occurred in the Shawai and Jiangwai fishing grounds in October of 2003 and 2013.The body lengths of the spawning stock and wintering stock in 2013 were larger than those in 2003,and the monthly sex ratios（female to male） were significantly less than 1 in both years.The monthly distribution of this fish in the southern Yellow Sea was consistent with a previous finding that ＂the stock migrated between the wintering grounds in the west of Jeju Island and the Lüsi spawning grounds＂ but tended to move more northward,with the spawning grounds extending outward.In the past decade,body length variation experienced a decline after an increase,rather than a steady decrease.The sex ratio in the single-stick stow net showed a tendency to increase over the decade,but was either less than or more than 1 depending on the fishing gear;therefore,further studies should be conducted to determine the sex structure.展开更多
Based on the standpoint to take for the crack size also to be a damage variable like the damage variable, by means of the two-directions coordinate system, several new calculation equations on the small crack gro...Based on the standpoint to take for the crack size also to be a damage variable like the damage variable, by means of the two-directions coordinate system, several new calculation equations on the small crack growth rate are suggested for describing the elastic-plastic behavior of some metallic materials. And the estimation formulas of life are also suggested relative to varied small crack size at each loading history, which is unsymmetric cyclic loading. In the calculation method, as a loaded stress-strain parameter to adopt the ratio with plastic strain range to elastic strain range, and as the material constants using the typical material parameters in damage calculation expression, a new concept of the compositive material constant, which has functional relation with the typical material constants, average stress, average strain, critical loading time is given out. In addition, the fatigue damage of a part of car is put up to calculate as an example, its calculation results are accordant with the Landgraf＇s equation, and calculation precision is more rigorous, so could avoid unnecessary fatigue tests and will be of practical significance on saving times, manpower and capitals, as well as the convenience for engineering applications.展开更多
目的明确脑小血管病(cerebral small vessel disease,CSVD)患者认知障碍(cognitive impairment,CI)的独立危险因素并构建列线图临床预测模型。方法回顾性纳入2017年1月1日~2022年12月31日于西安交通大学第一附属医院住院诊断为脑小血管...目的明确脑小血管病(cerebral small vessel disease,CSVD)患者认知障碍(cognitive impairment,CI)的独立危险因素并构建列线图临床预测模型。方法回顾性纳入2017年1月1日~2022年12月31日于西安交通大学第一附属医院住院诊断为脑小血管病的患者共247例,依据简易认知状态量表(mini-mental state examination,MMSE)分为伴有认知障碍组(CSVD-CI组,n=83)及无认知障碍组(CSVD-NCI组,n=164),通过Logistic回归筛选其发生认知障碍的影响因素,基于筛选的影响因素建立列线图临床预测模型并检验该模型效能。结果与CSVD-NCI组相比,CSVD-CI组患者中性粒细胞/淋巴细胞比值(neutrophil/lymphocyte ratio,NLR)(3.03±2.56 vs 2.33±1.34)和清蛋白/球蛋白比值(1.58±0.27 vs 1.49±0.28)显著增高、估测肾小球滤过率(estimated glomerular filtration rate,eGFR)[88.59±16.59 ml/(min·1.73m^(2))vs 94.02±12.45 ml/(min·1.73m^(2))]显著减低,差异具有统计学意义(t=2.282,2.426,2.689,均P<0.05)。与CSVD-NCI组比较,CSVD-CI组患者男性比例更低(43.4%vs 67.7%),且受教育程度更低(2.13±1.50 vs 2.86±1.12),差异具有统计学意义(χ^(2)=13.516,t=4.283,均P<0.001)。NLR(OR:1.20,95%CI:1.01~1.43),性别(OR:0.43,95%CI:0.24~0.79),eGFR(OR:0.97,95%CI:0.95~0.99)及受教育程度(OR:0.72,95%CI:0.57~0.91)为CSVD患者发生认知障碍的影响因素。基于此四项影响因素建立列线图预测模型具有良好的认知障碍预测效能(AUC=0.704,95%C:0.633~0.766)。结论构建的列线图在预测CSVD患者认知功能障碍的发生方面具有较高的准确度和临床实用性。展开更多
基金Funded by the Natural Science Foundation Key Project of Hubei Province(No.2011CDA060)
文摘Pure K2Ti4O9 whiskers were prepared by KDC（Kneading-Drying-Calcination） method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio（RT/K）, calcination temperature（TC） and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC（thermo gravimetric-differential scanning calorimeter）, XRD（X-ray diffraction）, and SEM（scanning electron microscope）. Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio（r）（over 250） can be obtained at RT/K = 2.9 and TC = 950 ℃.
基金The Natural Science Foundation of Jiangsu Province of China under contract No.BK20140438the Special Fund for the Fishery Resource Survey Project of East China Sea Region by the Ministry of Agriculture+1 种基金the Jiangsu Innovative Experiment Project for Postgraduate Students of China under contract No.CXZZ13_0275the Jiangsu Science and Technology Support Program of China under contract No.BE2012422
文摘Monthly fishery survey data of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea from2003 and 2013 were employed to evaluate the variation in the resource distribution and biological characteristics（especially body length and sex ratio） in the population on a decadal scale.The results indicated that the small yellow croaker migrated from the Shawai fishing ground to the Dasha fishing ground in spring and was mainly distributed in the central and western parts of the Dasha fishing ground in April and May.Larimichthys polyactis in the Dasha fishing ground migrated eastward to offshore wintering grounds in autumn and reached the central Dasha fishing ground in October and November.The small yellow croaker entered the western waters of the Shawai fishing ground in winter.A large number of age 0＋ fish occurred in the Shawai and Jiangwai fishing grounds in October of 2003 and 2013.The body lengths of the spawning stock and wintering stock in 2013 were larger than those in 2003,and the monthly sex ratios（female to male） were significantly less than 1 in both years.The monthly distribution of this fish in the southern Yellow Sea was consistent with a previous finding that ＂the stock migrated between the wintering grounds in the west of Jeju Island and the Lüsi spawning grounds＂ but tended to move more northward,with the spawning grounds extending outward.In the past decade,body length variation experienced a decline after an increase,rather than a steady decrease.The sex ratio in the single-stick stow net showed a tendency to increase over the decade,but was either less than or more than 1 depending on the fishing gear;therefore,further studies should be conducted to determine the sex structure.
文摘Based on the standpoint to take for the crack size also to be a damage variable like the damage variable, by means of the two-directions coordinate system, several new calculation equations on the small crack growth rate are suggested for describing the elastic-plastic behavior of some metallic materials. And the estimation formulas of life are also suggested relative to varied small crack size at each loading history, which is unsymmetric cyclic loading. In the calculation method, as a loaded stress-strain parameter to adopt the ratio with plastic strain range to elastic strain range, and as the material constants using the typical material parameters in damage calculation expression, a new concept of the compositive material constant, which has functional relation with the typical material constants, average stress, average strain, critical loading time is given out. In addition, the fatigue damage of a part of car is put up to calculate as an example, its calculation results are accordant with the Landgraf＇s equation, and calculation precision is more rigorous, so could avoid unnecessary fatigue tests and will be of practical significance on saving times, manpower and capitals, as well as the convenience for engineering applications.
文摘目的明确脑小血管病(cerebral small vessel disease,CSVD)患者认知障碍(cognitive impairment,CI)的独立危险因素并构建列线图临床预测模型。方法回顾性纳入2017年1月1日~2022年12月31日于西安交通大学第一附属医院住院诊断为脑小血管病的患者共247例,依据简易认知状态量表(mini-mental state examination,MMSE)分为伴有认知障碍组(CSVD-CI组,n=83)及无认知障碍组(CSVD-NCI组,n=164),通过Logistic回归筛选其发生认知障碍的影响因素,基于筛选的影响因素建立列线图临床预测模型并检验该模型效能。结果与CSVD-NCI组相比,CSVD-CI组患者中性粒细胞/淋巴细胞比值(neutrophil/lymphocyte ratio,NLR)(3.03±2.56 vs 2.33±1.34)和清蛋白/球蛋白比值(1.58±0.27 vs 1.49±0.28)显著增高、估测肾小球滤过率(estimated glomerular filtration rate,eGFR)[88.59±16.59 ml/(min·1.73m^(2))vs 94.02±12.45 ml/(min·1.73m^(2))]显著减低,差异具有统计学意义(t=2.282,2.426,2.689,均P<0.05)。与CSVD-NCI组比较,CSVD-CI组患者男性比例更低(43.4%vs 67.7%),且受教育程度更低(2.13±1.50 vs 2.86±1.12),差异具有统计学意义(χ^(2)=13.516,t=4.283,均P<0.001)。NLR(OR:1.20,95%CI:1.01~1.43),性别(OR:0.43,95%CI:0.24~0.79),eGFR(OR:0.97,95%CI:0.95~0.99)及受教育程度(OR:0.72,95%CI:0.57~0.91)为CSVD患者发生认知障碍的影响因素。基于此四项影响因素建立列线图预测模型具有良好的认知障碍预测效能(AUC=0.704,95%C:0.633~0.766)。结论构建的列线图在预测CSVD患者认知功能障碍的发生方面具有较高的准确度和临床实用性。
