水—DMF—NaCl系统活度系数和粘度测定

利用电池电动势法测定了298.15K下NaCl在不同DMF含量的水－DMF混合溶剂中的活度系数。结果表明,随着混合溶剂中DMF含量的增加NaCl的活度系数减小,测定了水－DMF－NaCl混合物在不同温度下的粘度。     

中老年男性血糖与血清脂质及载脂蛋白的关系

目的　研究血糖水平与脂质及载脂蛋白水平的关系。方法　对成都地区 735例 40～ 70岁男性空腹 12～ 14小时的血糖、血清甘油三酯 (TG)、胆固醇 (TC)、高密度脂蛋白胆固醇 (HDL- C)、低密度脂蛋白胆固醇(L DL- C)和血清载脂蛋白 (apo) A 、A 、B10 0、C 、C 及 E含量进行了测定。依空腹血糖的水平将受试对象分为正常组 (S1)、糖耐量减退组 (S2 )、糖尿病组 (S3)。结果　结果显示 :S2和 S3的高脂血症发病率比 S1高 (分别为64.5 %、45 .2 %和 32 .1% ) ;空腹 TG水平 S2 (3.62± 2 .5 2 mm ol/ L)和 S3(4 .45± 3.82 mmol/ L)均显著高于 S1(1.92± 1.93m mol/ L) ,P均 <0 .0 1;TC水平 S2 (5 .68± 1.15 mmol/ L)和 S3(5 .68± 1.12 m mol/ L)亦显著高于 S1(5 .13±1.0 6m mol/ L) ,P均 <0 .0 5 ;S2和 S3的血清 apo B10 0、C 、C 及 E水平显著高于 S1(P均 <0 .0 1或 P<0 .0 5 )。相关分析表明 ,血糖与血清 TG在 S1、S2和 S3中均呈显著正相关 (r分别为 0 .180 0、0 .1436和 0 .32 12 ) ,P均 <0 .0 0 1;而在 S2和 S3中血糖与 HDL- C呈负相关 (r分别为 - 0 .2 5 34和 - 0 .1477) ,P均 <0 .0 0 1;在 S1、S2、S3组中血糖与血清 apo B10 0、C 及 E呈正相关 (P均 <0 .0 0 1) ,与 apo C 则在 S1和 S2中呈正相关 (P<0     

2014年—2018年内蒙古社区卫生资源配置现状及公平性研究

目的 分析2014—2018年内蒙古社区卫生资源配置现状及公平性情况,为进一步优化社区卫生资源配置提供依据。 方法 采用洛伦兹曲线和基尼系数评价内蒙古社区卫生资源配置公平性。 结果 内蒙古地区社区卫生资源配置按地区分布存在“中间高,两边低”的现象。2014年至2018年内蒙古地区卫生资源总量在不断增长;整体看在国内生产总值维度上各项社区卫生资源洛伦兹曲线弯曲程度最小,地理面积维度上各项社区卫生资源洛伦兹曲线弯曲程度最大。 结论 内蒙古社区卫生资源总量不断增长,但人均不足;执业（助理）医师和注册护士人才稀缺;按常住人口和国内生产总值配置的卫生资源比较公平,按地理面积配置的卫生资源差距悬殊。     

On the secondary stability of coated cementless hip replacement: parameters that affected interface strength

Unlike primary stability of coated cementless implants, their secondary stability has been poorly studied. This paper considers some theoretical aspects of the secondary stability of a coated cementless hip implant in a human femur. The bone is separated from the implant by a thin layer of microscopic peaks and troughs formed on the surface of the coating. The size of the peaks and troughs is very small compared with the macrosize of the implant stem and bone in contact. The study of the bone–stem contact by direct application of the finite element method is prohibitively costly. A two-scale asymptotic homogenisation procedure that takes into account the microgeometry of the interface layer and mechanical properties of bone and the implant material is applied to obtain effective, homogenised contact parameters. These parameters can be used in finite element analyses involving smooth interfaces, which require hundreds of times fewer finite elements. With the homogenisation technique and finite element analyses for a simplified design, two parameters were found to be most important—the normal contact stiffness and the friction coefficient. They both increase several times as bone grows into the rough surface of the implant and mineralises, thus providing a stronger interface and resulting in reduced micromotions.     

液体表面张力系数及测量精度的分析

分子之间的相互作用产生分子力,阐述表面张力形成的基本原理。对表面张力系数的测量进行分析,讨论提高测量精度的方法。     

The Development of a Predictive Method for the Estimation of Flux Through Polydimethylsiloxane Membranes. IV. Application to a Series of Substituted Quinolines

The steady-state flux of 33 substituted quinoline derivatives was determined in polydimethylsiloxane membranes using isopropyl alcohol as the receiver solvent. These diffusants constituted a diverse group of compounds possessing a wide range of hydrophobic, steric, and electronic characteristics. Various parameters representing these physicochemical properties such as cyclohexane–water fragmental constants, molar refractivity, Hammett's constants, intramolecular hydrogen bonding ability, melting point, and mole fraction solubility were employed to develop empirical models capable of relating the rate of diffusion to these characteristics of either the substituent on the quinoline ring or the compound itself.     

Natural frequency/damping coefficient relationship of the catheter-manometer system required for high-fidelity measurement of the pulmonary arterial pressure

Using a digital simulation method, we analyzed the relationship between natural frequency (f _n ) and damping coefficient () of the catheter-manometer system required for high-fidelity measurement of the pulmonary arterial pressure. The pulmonary artery pressure waveform was obtained with a catheter-tip transducer and it was fed into a dynamic simulator programmed on a computer. The original waveform and the output of the simulator were compared and judged visually for the fidelity. From this analysis, the combination of f _n and was obtained and was plotted on a f _n – diagram. It showed as an area, which was convex on the left side and open on the right side. The left-convex endpoint was located at a damping coefficient of about 0.7. At a lower heart rate, this area was extended to the lower frequency side, while, at a higher heart rate, this area was limited to the higher frequency side. The f _n – diagram was also constructed theoretically by calculating the relations between natural frequencies and damping coefficients of a second order system with the amplitude and phase error tolerance set at +/–5% respectively.(Kinefuchi Y, Suzuki T, Takiguchi M, et al.: Natural frequency/Damping coefficient relationship of the catheter-manometer system required for high-fidelity measurement of the pulmonary arterial pressure. J Anesth 7: 419--426, 1993)     

反相气相色谱法测定溶剂在PBMA中的无限稀释活度系数

用反相气相色谱方法测定了１６种溶剂在聚甲基丙烯酸丁酯（ＰＢＭＡ）中３４３￣４３３Ｋ范围内的无限稀释活度系数,并用周浩等的高分子溶液分子热力学模型对实验结果进行了关联,结果令人满意。     

人工股骨头置换术的应用解剖

目的:为临床人工股骨头置换术人工假体的选择、安装及定位提供可靠的解剖学参数。方法:对250例(左右各125例)正常成人股骨头、股骨颈、大转子与外上髁间距进行观测,并得出转子髁间距与股骨头最大径、股骨头颈前长和股骨头颈后长的相关系数和回归方程。结果:股骨头最大径为4.39±0.31cm,股骨头颈后长为6.89±0.49cm,股骨头颈前长为6.18±0.43cm,大转子与外上髁间距为34.40±1.79cm。结论:采用本文作者提供的方法选择、安装人工假体准确、实用、方便