求整体优化全部解的区间排除遗传算法

为了改善单纯遗传算法中的模式欺骗和早熟现象,应用区间算法和遗传算法的理论、方法构造了一种区间排除混合遗传算法,并采用二阶Lipschitz扩展作为检验极值的条件,用计算实例验证了本算法在一类整体优化问题中具有收敛到全部解的优良性能,检验条件简单、容易实现,明显提高了收敛的速度、可靠性,很好地解决了模式欺骗和早熟现象.     

Three Levels of Understanding of Special Relativity

1.IMRODUCTIONThefirstcompleteformulation(henceofunderstanding)ofspecialrelativity(SR)wasduetoEinsteinwhoPOstulatedtheinvarianceoflightspeedinvacuo.Thisassumptionappearedhighlynonintuitive.Actuallyitseemedabsurdthatafterhavingmeasuredthespeedofthelightemittedbyasource,oneshouldmeasurethesamevaluewhenapproaching(ordrivingawayfrom)thesamesourceoflight.ItwasthegreatmeritofMansouriandSexl[l]tohaveshownthatthelightspeedinagivendirectionisindependentofthereferencesystemSprovidedtheclocksofSbe…     

Tricyclic antidepressants antagonize prostaglandin (PG) E20induced contractions of the guinea pig ileum and hypomotility in the mouse

Summary The interactions of PGE₂ and 2 tricyclic antidepressants were tested both on the guinea pig ileum and motility in the mouse. PGE₂-induced contractions of the guinea pig ileum were irreversibly blocked by amitriptyline and desipramine. Chronic administration of amitriptyline and desipramine blocked PGE₂-induced hypomotility in the mouse.     

Cahn─Hilliard方程的近似惯性流形

本文讨论Ｃａｈｎ－Ｈｉｌｌｉａｒｄ方程解的长时间行为，通过压缩映象原理，对该方程构造了一个逼近惯性流形。     

The performance of the octopus circulatory system: A triumph of engineering over design

Summary Despite the very considerable difficulties presented by the basic molluscan anatomy and the possession of a blood pigment with an oxygen carrying capacity that never exceeds 4.5 vols%, the cephalopod circulatory system contrives to deliver oxygen at a rate fully comparable with that of an active fish. This is achieved by adding accessory pumps to push blood through the gills, by a multiplicity of pulsatile veins and by raising the systemic blood pressure considerably above the levels found in other molluscs. Detailed control of blood distribution is a necessity in a system where the peripheral resistences may be expected to change dramatically when the animal starts to move and large parts of the central nervous system are apparently dedicated to this task. In this account we have reviewed blood pressure and flow at rest and in exercise. We have further examined the evidence which indicates how the animals modulate the cardiac output, drawing attention to the very different response found in cephalopods and the higher vertebrates.     

Regulations of thyroid hormone on cardiac protein kinase C signal pathway in vitro

The experiments were conducted to assess the influences of thyroid hormone on cardiac protein kinase C(PKC) signal pathway with cultured cardiac myocytes and fibroblasts as the models. Cells were pretreated with 1% newborn calf serum (NCS) or angiotensin II (Ang II), and then following by a triiodothyronine (T3) treatment. The PKC activity, PKC_α and PKC_ε expressions were analyzed and compared. In 1% NCS pretreatment, T3 could inhibit PKC activity and PKC_ε expression in cardiac myocytes. The AngII pretreatment led to an increase of PKC activity and PKC_ε expression in cardiac myocytes, and an increase of PKC activity in cardiac fibroblasts. Following by T3 treatment, the increased PKC activity and PKC_ε expression in cardiac myocytes were markedly decreased. In conclusion, whether in 1% NCS or in Ang II pretreatment, T3 could inhibit PKC activity and PKC_ε expression in cardiac myocytes. Foundation item: Supported by the Natural Science Foundation of Hubei Province (98091) Biography: WANG Bao-hua (1974-), female, Ph. D, research direction: cardiovascular pathophysiology.     

一种改进变异控制策略的遗传算法研究

早熟收敛问题是遗传算法中影响寻优效果的重要因素。分析了变异策略中由经验参考值确定的变异概率对样本多样性的影响，提出了采用自适应变异控制变异算子的方法，阐述了根据进化过程选择变异时机和变异概率的思路。通过实例计算结果的比较，证明了改进自适应变异算法可以有效地解决早熟收敛问题。     

综合的并行搜索策略及其在剩余静校正中的应用

文章以并行遗传算法为基础，根据生物遗传规律的特点，综合多种杂交方式和生物遗传技术（共享技术、受限交配、灾变等），提出了一种综合的并行搜索策略，用以克服遗传算法的早熟收敛现象，提高遗传寻优的效率。通过对剩余静校正估计的模型试验，其结果比常规的单一遗传算法有明显的改善，能够更有效地接近于真正的最优解。     

关于一致空间的公共不动点

证明了一致空间的若干公共不动点定理，推广和改进了Ａｃｈａｒｙａ，Ｊｕｎｇｃｋ，Ｍｉｓｈｒａ和Ｒａｏ的结果。     

冷铁在球铁曲轴生产中的合理应用

利用冷铁能防止球铁曲轴的缩松缺陷.本文探讨了冷铁的合理使用问题,通过理论分析和试验,提出了防止球铁曲轴缩松的工艺措施.