吸收式热泵最佳泵热率与泵热系数及传热面积间的关系

考虑工质与热源间的不同传热系数，分别导出第Ⅰ类和第Ⅱ类吸收式热泵的最佳泵热率与泵热系数及总传热面积间的关系，讨论了传热面积的优化问题。所得结果对吸收式热泵的优化设计具有一定的指导意义。     

高寒草地暖季肥育牦牛肉质特性研究

对暖季育肥的麦洼牦牛的肉质特性进行了较系统的测试和分析,测定了10头供试牦牛肌肉中的PH值、系水率、肉的贮存损失、熟肉率和烹调损失率,肉色及大理石纹评分等,分析了肌肉中营养成分,微量元素含量及氨基酸含量;还测定了牦牛脂肪的熔点、碘价和皂化价,暖季育肥的补饲添加剂和埋植增重剂除对肉质特性的某些指标引起一些改变外,并未使肉质特性发生明显变化,牦牛埋植增重剂后引起肌肉中激素含量增加,牦牛肉质特性的研究对探明影响牦牛肉品质的因素,牦牛肉的保存和品质改善具有重要意义,将为牦牛肉品资源的开发利用积累有益的资料。     

TH-PPM UWB系统的多址干扰模型改进及误码性能分析

跳时-脉冲位置调制方式(TH-PPM:Time-Hopping Pulse Position Modulation)是IR-UWB系统中最常用的多址调制方式之一,针对该多址方式的性能分析一直是UWB技术研究的一个热点。一些文献采用多址干扰特征函数直接数值计算的方法对相干接收方式下异步UWB多用户系统的误码性能进行了分析并获得了精确的数值分析结果,但是相应的分析过程中存在着一定的系统参数设置约束。本文针对现有多用户干扰模型的不足进行了改进和完善,并推导了相应的MAI概率分布和多址干扰误码性能解析表达式。最后通过Monte-Carlo计算机仿真,对改进模型下理论分析结果的有效性进行了验证。     

我国古代"情志相胜,以情胜情"的心理疗法及其对现代心理治疗的影响

我国中医学源远流长,其"情志相胜,以情胜情"的心理治疗理念、相应的具体治疗方法及案例,对于分析现代人的心理疾病、并针对性地进行临床治疗具有重要的作用.     

Cardiac protective role of a novel erythrocyte-derived depressing factor on rats and its Ca^2＋ mechanism

The cardiac protective role of a novel erythro-cyte-derived depressing factor (EDDF) on spontaneous hy-pertensive rats (SHR), calcium overload (CaO) rats and Wistar rats and its mechanism was evaluated. Mean artery pressure (MAP), heart rate (HR) and LVdp/dtmax were measured by physiological recorder. The effect of EDDF on the Ca2+-ATPase activity in myocardial sarcoplasmic reticu-lum (SR) of CaO rats was determined by inorganic phos-phate assay. Calcium transport in myocytes was measured by 45Ca2+ radioactive isotope measurement. The phosphoryla-tion levels of extracellular signal-regulated protein kinases (ERK1/2) in myocardial tissue of SHR and CaO rats were measured by Western blot method. And the ultrastructures of cardiac muscle cells were observed with the transmission electron microscope. The results indicated that EDDF could significantly decrease MAP, HR and LVdp/dtmax in a dose dependent manner (P < 0.05). It seems that the mechanism might relate with activating the Ca2+-APTase, enhancing the uptake and release of Ca2+ from SR (P < 0.05), decreasing the phosphorylation levels of ERK1/2 of myocytes (P < 0.01) and lightening the ultrastructural lesion of cardiac muscle cells. In CaO rats, the Ca2+-ATPase activity decreased clearly com-pared to control (64.99 7.16 vs 94.48 7.68 nmol·min-1 ·mg-1 protein, P < 0.01), while EDDF (100 mg/mL) could significantly increase the activity (87.93 ?9.54 vs 64.99 ?7.16, P < 0.05, n = 7). Both uptake and release rate of Ca2+ (祄ol 45Ca2+/g protein/min) from myocardial SR of CaO rats re-markably decreased compared to control (32.40 ?2.70 and 15.46 ?1.49 vs 61.09 ?10.89 and 25.47 ?4.29, P < 0.05); EDDF (100 mg/mL) could significantly stimulate their activi-ties (50.48 6.76 and 21.76 2.75 vs 32.40 2.70 and 15.46 1.49, P < 0.05). EDDF could evidently down-regulate the phosphorylation of ERK1/2 in myocardial tissue from SHR and CaO rats (P < 0.01), lighten the ultrastructural lesion of cardiac muscle cells of SHR as well. It is concluded that EDDF seems to play protective roles on both structure and function of heart, which closely related with amelioration of Ca2+ transport and inhibition of Ca2+-MAP kinase pathway.     

健脑益寿胶囊对衰老模型小鼠体内LPO的影响

观察健脑益寿胶囊的抗衰老作用,并初步探讨其作用机理.选用6月龄小鼠随机分为6组,分别为健脑益寿胶囊高、中、低剂量组、模型组、维生素E组、空白对照组.另取2月龄小鼠10只,作为青龄对照组.除空白对照组、青龄空白组外均颈背部sc给予D-半乳糖,剂量为120 mg/kg,造成衰老模型,并同时灌胃给予健脑益寿胶囊高、中、低3个剂量组健脑益寿胶囊,剂量分别为3.744、1.872、0.936 g/kg,维生素E组灌胃给予维生素E,剂量为20 mg/kg(模型组不给药),连续造模、给药6周,6周后处死小鼠,分别测定心、肝组织的脂质过氧化产物(LPO)含量.健脑益寿胶囊可不同程度降低D-半乳糖所致衰老小鼠心、肝组织的LPO含量.健脑益寿胶囊能降低体内脂质过氧化产物的含量,具有明显的延缓衰老作用,其抗衰老作用机理可能与其降低体内脂质过氧化产物的含量有关.     

中国流动性过剩根本原因辨析

流动性过剩问题最近已成为学术界争论的焦点,本文在别人研究的基础上对流动性问题产生的根源进行探讨,得出了流动性过剩的根源在于外汇占款过多,并在此研究的基础上提出了相应的政策建议。     

Lotka—Volterra自催化振荡模型分析

本文对Lotka—Volterra提出的自催化振荡模型机理进行动力学分析,看化学振荡的线性和非线性特征。     

带Fuzzy外壳和Boole心脏的险象识别逻辑

结合新近发展起来的Ｆｕｚｚｙ命题逻辑的思想和组合线路险象识别技术的背景，改造Ｇｏｅｄｅｌ蕴算子和公式代数的赋值格，构造了另一种带Ｆｕｚｚｙ外壳和Ｂｏｏｌｅ心脏的险象识别逻辑，对其进行了语义地研究，得到了若干有趣的结果。     

老年冠心病心理护理体会

本文介绍了对老年冠心病人的心理护理体会及具体方法。