厦门港船舶引航系统的设计与应用

根据厦门港及其船舶引航的特点,综合应用差分GPS定位技术、AIS技术、电子海图等先进技术,完成了具有特色的厦门港船舶引航系统的设计,并在厦门港投入使用.经应用表明,该系统的功能强、操作便捷、设备便携性好,能够更加有效地保障厦门港船舶引航的安全.     

Investigation of Phase Inversion of Liquid-Liquid Dispersions in Agitated Vessels

Introduction Liquid-liquid dispersions in agitated vessels are fre-quently used in the chemical industry for conducting operations such as solvent extraction and heterogene-ous reactions. In liquid-liquid two-phase flow systems, usually consisting of an a…     

RACK1基因在急性冠脉综合征行PCI术患者外周血中的表达及意义

选取在我院行PCI术的急性冠脉综合征患者66例,用实时荧光定量PCR法分别测定PCI术前及术后3个月时患者外周血单个核细胞中RACK1基因的表达。40名健康者作为对照组。测定结果是:(1)急性冠脉综合征组患者外周血单个核细胞中RACK1 mRNA表达水平明显高于对照组(17.56±4.98 vs 3.11±1.24,P0.05);(2)急性冠脉综合征患者行PCI术3月后,外周血单个核细胞中RACK1 mRNA表达水平较术前明显降低(10.84±3.71 vs 17.56±4.98,P0.05),但仍高于健康者(10.84±3.71 vs 3.11±1.24,P0.05)。RACK1在急性冠脉综合征患者外周血中表达上调,其表达水平可能和病情进展相关。     

用模式识别方法分析心血管病的测试数据

本文对心血管病诊断中血液流变学的测试样本,用KL展开进行特征压缩,并用Fisher准则与逐次校正相结合的方法,对测试样本及特征压缩后的样本进行分类分析,获得较好的效果。     

动态血压变异性与高血压伴冠心病的关系探讨

目的 :探讨动态血压变异性(ABPV)与高血压伴冠心病的关系。方法 :采用24h动态血压监测(24hABPM)仪 ,对46例原发性高血压(EH)伴冠心病(CHD)和60例EH无并发症患者及45例正常人进行24hABPM ,以24h、白天、夜间血压均值 ,血压变异性为参数指标。结果:三组24h、白天、夜间血压均值相互比较有显著的统计学意义(P<0 01)。血压变异性 ,EH伴CHD与高血压无并发症组及正常对照组比较有显著的统计学意义(P<0 01) ,而高血压无并发症组与正常对照组比较除白天收缩压变异性有明显差异性外 ,其余无统计学意义。结论:高血压伴冠心病与动态血压变异性及动态血压均值有密切的关系。血压变异性可作为一项有别于平均血压的独立的预测心血管病变及自主神经受损程度的敏感指标。     

A comparison on failure pressures of cylindrical pressure vessels

In this work, the failure pressures of thick and thin walled cylindrical pressure vessels considering the Voce hardening law and plastic orthotropy effect are obtained. The solution presented is used to compare the failure pressures of copper and brass cylindrical pressure vessels.     

尾板宽度对高速排水型艇的阻力和耐波性影响

不同尾板宽度的两种艇型的阻力和耐波性试验结果表明，高速排水型艇的尾板相对宽度ＢＴ／Ｂｘ对阻力和耐波性均有影响，ＢＴ／Ｂｘ值过小的艇，其剩余阻力系数明显增加。ＢＴ／Ｂｘ作为影响高速排水型艇航行性能的船型参数较之尾板相对面积ＡＴ／Ａｘ更恰当，综合阻力和耐波性试验结果，ＢＴ／Ｂｘ值取等于或略大于０．７５是适宜的。     

116例冠心病患者血清中10种必需微量元素水平的研究

１１６例冠心病患者血清中１０种必需微量元素的含量与正常值比较，具有如下特点：（１）铁，锌、铬，镍含量升高；２硒钴，钒，钼含量降低；（３）铜和锰差异无显著性。     

Cotton Cellulose Ageing in Sealed Vessels. Kinetic Model of Autocatalytic Depolymerization

In this paper, we propose a new kinetic model that describes the depolymerization of pure cotton cellulose, applicable to ageing experiments in sealed vessels. By recording the pH of the salt solutions used for controlling the relative humidity inside the vessels, we demonstrate that volatile acidic species are produced during the ageing of pure cellulose. Based on the proposition that the acids produced must have an autocatalytic effect on the depolymerization of cellulose, we theoretically developed equations describing the time dependence of the percentage of the broken glycosidic bonds, the folding endurance, tensile strength, tensile energy absorption, stretch at break and the L* and b* coordinates of the CIEL*a*b* color system. The experimentally determined values of these pure cellulose paper properties were fit into the model equations by use of a computer statistical package. The very high values of the regression coefficients indicate that the model equations work quite well. The experimental data and the model equations indicate that for long ageing times (up to 150 days at 80 °C), the deterioration of the sample properties accelerates and finally brings about an abrupt breakdown of the samples. Under the light of these findings, we believe that the useful life of the historical paper stored in archives and libraries is less than predicted by the existing models, and steps for its preservation should be taken immediately. As an additional preservation measure, we propose the ventilation of the storage areas so that the volatile acidic products of paper deterioration that accelerate its ageing are removed.     

冠心病心率变异性分析及其临床意义

探讨各类冠心病患者的心率变异性及其对预后的意义。为病情的诊断和临床治疗提供理论依据。