热方程的边界积分与有限元方法耦合

本文对热方程外区域问题,应用边界积分与有限元耦合方法,给出了此法的理论分析:导出了耦合问题的变分形式,证明了耦合变分问题的适定性,且获得了逼近解的收敛性及误差估计。     

Dual role of cAMP duringDictyostelium development

cAMP plays an essential role duringDictyostelium development both outside and inside the cell. Membrane-bound receptors and adenylyl cyclase are responsible for sensing and producing extracellular cAMP, whereas a phosphodiesterase is responsible for maintaining a low basal level. The molecular events underlying this type of hormone like signalling, which are now beginning to be deciphered, will be presented, in the light of cAMP analogue studies. The importance of intracellular cAMP for cell differentiation has been demonstrated by the central role of the cAMP dependent protein kinase. Mutants as well as strains obtained by reverse genetics will be reviewed which lead to our current understanding of the role of intracellular cAMP in the differentiation of both stalk and spore cells.     

子宫翻出致休克、DIC病例

子宫翻出是一种罕见而又严重的分娩期并发症,一旦发生若得不到及时治疗,可引起大出血、休克,甚至DIC,严重威胁病人的生命.     

一个人类锌指蛋白家族新基因ZFP28的克隆及表达

Krupple型锌指蛋白是一类具有重要功能的转录调节因子，初步克隆了一个新的人类krupple型锌指蛋白基因，经国际基因命我委员会批准命名为ZFP28。此基因长4076个碱基，含8个外显子，在基因组DNA上长18kb。它编码的蛋白质全长868个氨基酸，含1个信号肽，2个KRAB框和14个C2H2型的锌指。Northem Bolt分析表明该基因在人类早期胚胎的各个组织中普遍表达，在肺和肝中的表达水平最强，其结构和表达特征预示着它编码的是一个具DNA结合功能的转录调控因子。     

中硅钼球铁铸件材料的研制

介绍了铁合金蠕变热压定形耐热球墨铸铁模具铸件的铸造、熔炼和热处理工艺，探讨了它的形成机理。研制出的铸件满足了钛合金蠕变定形处理的要求。     

Oil shocks: How can OECD countries manage them best?

As the 1990-91 Gulf crisis has emphasized, the risk of new oil shocks remains high in the medium to long run. Although energy intensity has decreased in the major countries since the first two oil shocks, the simulation performed with the MIMOSA world model, which is described in this paper, shows that a permanent rise in oil prices still induces direct strong negative consequences in the OECD: a temporary recession, a durable loss in production and employment and a lasting rise in inflation. Moreover, according to the model and due to national dissimilarities, an oil shock in Europe has some asymmetrical effects which are pointed out here. Further simulations test two different economic policy responses in the OECD: a ‘beggar-thy-neighbor’ policy in which each country tries to ‘export’ its unemployment by curbing domestic inflation and wage growth; and a co-ordinated policy supporting both supply and demand. The first leads to a general deflationist overshooting. The second ensures stabilization with a much lower cost in employment.     

扫描法固体低温比热测量系统及其分析

介绍了扫描法测量固体低温比热的实验系统及其出现的问题和解决方法.用此实验系统对纯度为99.7%电介铜的比热测量结果表明,它与美国国家标准参考数据相比,在80K—260K范围内偏差小于7%.     

回流式冷凝排雾器的研制

一种回流式冷凝排雾器,可用以解决绳状染色机及其他热湿设备的排雾问题,可大辐度节能和减小环境污染。     

恒热流加热时半无限大区域内熔化问题的分析解

应用正则摄动方法研究了恒热流加热时半无限大区域内熔化问题,得到了一种近似分析解,所得结果对工程设计具有实用价值。