一类二维加权积分数值求积方法及其误差分析

针对一类二维加权积分的数值计算方法及误差分析进行研究,参照一维广义高斯积分数值求积方法提出一种具有较高代数精度的计算方法并对其误差做分析,同时给出几个简明的结果。这些结果可用到诸如小波分解,图像处理与多分辨数字信号处理等领域。     

网络"恶搞"电影作品的法律问题研究

对电影作品的网络"恶搞"是我国网络产业发展的新产物,在形式和内容上都有其显著特点。网络"恶搞"能够迅速流行有深刻的文化和技术背景。从性质上说,网络"恶搞"属于新型文艺评论,也具备构成改编作品的条件。网络"恶搞"在网络的传播可能对电影作品的著作权、相关主体的名誉权和肖像权构成侵犯,尽管如此,我们应当在保护公民言论自由的基础上寻求对其进行规制。     

论思维创新活动的自组织性

从知识社会学意义来看,思维创新活动的社会化过程存在着三个阶段。在潜思维创新阶段存在着社会思维系统内部由新质差别所引起的对常规思维平衡态的偏离即微观涨落。在趋显思维创新阶段,这种思维创新的微观涨落由于处在远离常规思维平衡态的非线性区域而不断得以放大与扩展,形成创新思维"巨涨落",从而推动着创新思维自身系统向新的有序化创新思维系统结构演进。在显思维创新阶段,各种思维创新主体及其思维知识信息相互融合和协同,在新的层次上形成了以新的思维范式为核心的社会创新思维有序化结构即社会创新思维耗散性结构。     

上海松江中心城区道路绿化类型及景观分析

将松江中心城区道路绿化的配置形式归纳为14个类型,并对各类型的绿化景观效果进行了分析。     

一个水稻三倍体×二倍体杂交F2群体的微卫星杂合性丧失

DB102为一田间发现的三倍体水稻,利用它做母本与二倍体水稻中作59杂交,得到一个早世代(F2)稳定群体,通过微卫星分析发现,该群体中有一些微卫星位点发生了杂合性丧失,且至少6条染色体上发生微卫星位点杂合性丧失(loss of heterzygoisity LOH)可能有DNA序列变化。而微卫星位点的杂合性丧失又可能与该杂交组合早世代稳定有关。     

黑豆色素的研究进展

本文综述了近年来黑豆色素的研究进展.提出了综合开发利用的前景.     

对北京市新型农村合作医疗制度的调查与思考

自2002年7月北京市大兴区率先在全国开展新型合作医疗试点至今,北京市新型农村合作医疗制度运行已经5年了.在对北京市新型农村合作医疗制度运行情况进行充分调研的基础上,总结了所取得的成效,分析了存在的问题,要进一步完善这项制度应提高筹资水平,实行动态缴费;提高补偿水平,提升制度吸引力;充实管办资源,重视调研能力建设等.     

SrNi2Fe16O27铁氧体的合成与性能研究

采用柠檬酸法合成出超微W型铁氧体。用XRD、VSM测试其结构和磁性能。试验结果表明,该法在1000℃制得的铁氧体性能优于其他方法制得的铁氧体,控制pH值、水量和柠檬酸的量对铁氧体的结构和磁性能都有一定的影响。     

Transient hyperammonemia due to urea cycle enzyme deficiency in Irish wolfhounds

BACKGROUND: Irish Wolfhounds frequently have a congenital portosystemic shunt, but a considerable proportion of the 6- to 8-wk-old pups has hyperammonemia in the absence of portosystemic shunting. This hyperammonemia causes no signs and is transient, normalizing at the age of 3-4 months. HYPOTHESIS: Transient hyperammonemia has a metabolic basis in Irish Wolfhounds. ANIMALS: Two related (same sire) litters of Irish Wolfhounds (17 pups) and their parents were studied. METHODS: Integrity of the portal circulation was examined by ultrasonography and scintigraphy. Absence of parenchymal liver disease was verified by liver biopsy. Amino acid profiles were measured in 4 pups and repeated in 2 of these pups when ammonia concentrations had normalized. The amino acid profiles were compared with those of healthy Irish Wolfhound pups. RESULTS: Fasting venous ammonia concentrations were high (113-622 microg/dL, 65-345 micromol/L) in all pups, whereas bile acids were within reference range in all but 1. The ammonia and bile acid concentrations from all parents were within reference range. Portosystemic shunting was excluded in all but 1 pup. Liver biopsy excluded significant lesions in all 10 pups examined. Hypercitrullinemia was found and persisted even when ammonia had normalized, at the expense of an increase in glutamine and asparagine. CONCLUSIONS AND CLINICAL IMPORTANCE: Citrulline concentrations are controlled by the urea cycle enzymes argininosuccinase and argininosuccinate synthetase, and a defect in either of these enzymes may be responsible for the transient hyperammonemia in Irish Wolfhounds. Resolution of the hyperammonemia is associated with increased activity of alternative metabolic pathways forming glutamine and asparagine. Confirmation requires measurement of enzyme activities in liver tissue.