基于CDMA/GPRS的DF1协议通讯驱动的开发

以AB DF1串口控制协议为例,说明了利用CDMA/GPRS DTU传输串口数据和组建无线远程控制系统(SCADA)的基本方法.对系统组建所涉及的软硬件环境进行了介绍,并详细描述了DF1控制协议的分析过程和将其与DTU开发包集成以实现新的通讯驱动的原理.通过此类原理,我们可以实现在统一的软件构架下,通过加载所需的通讯驱动,与包含不同用户设备的RTU进行通讯,而这样的RTU,均是采用DTU为其通讯手段.     

Shaping the national system of inter-industry knowledge exchange : Vertical integration, licensing and repeated knowledge transfer in the German plastics industry

We will claim in this paper that it was in particular the above-average propensity to share innovative information with customers and competitors which caused the exceptional international competitiveness of the West German plastics industry including chemical firms, plastics fabricators and machine makers. The system of knowledge exchange of this national cluster was shaped in two main steps. In the first half of the 20th century, cartellization and mergers were first tolerated and then even supported by the German government. It was in this period when German chemical firms formed the vertically integrated I.G. Farben concern which provided an optimal organisational framework to explore the new technological path of plastics. After the breaking up of I.G. Farben the firms of the West German chemical firms had to find new ways to maintain inter-industry technological co-operation in the second half of the 20th century. It turned out that they became aware of both contractual and non-contractual solutions of bundling standard good and information which were often placed somewhere between “market” and “hierarchy”. It seems to be no accident that all these different institutions did primarily encourage knowledge exchange between firms in geographical and cultural proximity. That is why the knowledge exchanging network of the plastics industry described in this paper has been in particular concentrated on German firms. Even so the question is still open whether this localisation is just a curiosity limited to a special industry cluster or part of a broader German system of knowledge exchange.     

SU(1,1)广义相干态中的高阶涨落和SU(1,1)高阶压缩

The higher-order fluctuations in the SU(1,1)generalized coherent states are discussed.The definition of higher-order SU(1,1)squeezing is introduced in terms of higher-order uncertainty relation.For two possible bosonic realizations of SU(1,1)Lie algebra,the second-,fourth-and sixth-order SU(1,1)squeezing are examined in detail.It is shown that the SU(1,1)generalized coherent states can be squeezed to not only second-order,but also fourth-and sixth-order.Hence,it follows that the higher-order squeezing will occur for the fluctuations of the square of amplitude in squeezed vacuum.SU(1,1)higher-order squeezing is a kind of non-classical property which is independent of second-order squeezing.     

运动与Th1和Th2细胞平衡

为了了解Th1和Th2细胞平衡及运动对Th1和Th2细胞平衡的影响,通过文献综述的方法论述了Th1和Th2细胞的生物特征、Th1和Th2型细胞因子的生物功能,以及运动对Th1和Th2细胞平衡的影响和运动引起Th1和Th2平衡偏移的可能机理及调节方法。     

Idiopathic Fetal Growth Restriction: Repercussion of Modulation in Oxidative Stress

Oxidative stress has been proposed as one of the causes involved in idiopathic fetal growth restriction (IFGR). However, the exact relationship between oxidative stress and IFGR is not understood. This study aimed at understanding the role of oxidative stress and antioxidant status in IFGR materno-fetal dyads and matched controls. 75 materno-fetal dyads with IFGR were enrolled with equal number of normal low risk controls. Malondialdehyde (MDA) levels were measured as marker of oxidative stress, while paraoxonase-1 (PON1) activity and total antioxidant capacity (TAC) of serum were measured as markers of antioxidant status. MDA levels were increased in both maternal and cord blood of IFGR neonates as compared to controls (p < 0.001). TAC of serum were found to be decreased in IFGR (both maternal and cord blood) as compared to controls (p < 0.001; p < 0.05, respectively). PON1 activity was found to be decreased in the IFGR mothers while it was found increased in IFGR cord blood (p < 0.01; p < 0.001)). IFGR is a state of increased oxidative stress. Decreased PON1 enzymatic activity in mothers is also associated with IFGR.     

The value of U.S. patents by owner and patent characteristics

This paper uses renewal data to estimate the value of U.S. patents, controlling for patent and owner characteristics. Estimates of U.S. patent value are substantially larger than estimates for European patents, however, the ratio of U.S. patent value to R&D for firms is only about 3%. Contrary to a common assertion, patents issued to small patentees are much less valuable than those issued to large corporations. Litigated patents are more valuable, as are highly cited patents. However, patent citations explain little variance in value, suggesting limits to their use as a measure of patent quality.     

清末贵州状元夏同龢书法赏析

清末贵州状元夏同龢“工文善书,有名当世.”其书法作品多为楹联、扇面等赠人之作.贵州省博物馆有其两副楹联,其中的行楷八言联取势自然,体态有度;苏州博物馆有其书法扇面一帧,其书娟秀清丽,温雅可人,均可窥见夏同龢书法严谨整饬、端庄平正的艺术风格.     

古塔变形量的分析与研究

古塔由于长期受到自重、气温、风力等各种自然因素的作用以及地震、飓风等偶然因素的影响,会产生各种变形。文章根据某古塔一至十三层每层八个测量数据,建立非线性规划模型计算出各层中心点的坐标,利用平面解析几何的相关知识可计算出各层的倾斜角度、倾斜位移以及扭曲程度,最后根据中心点的拟合曲线计算古塔的弯曲程度即曲率,预测古塔的倾斜角度、倾斜位移、扭曲程度以及弯曲程度的变化趋势。     

Serum Paraoxonase (PON1) Activity in North-West Indian Punjabi’s with Acute Myocardial Infarction

Human serum paraoxonase-1 (PON1), an enzyme on HDL prevents oxidation of LDL thereby preventing the development of atherosclerosis. Studies done so far have lead to conflicting results. As studies are lacking in North-West Indian Punjabi’s, a distinct ethnic group with high incidence of coronary artery disease, we determined PONase activity in this population. It has been postulated that sudden lowering of serum PONase may lead to precipitation of acute myocardial infarction. We determined serum PONase activity and lipids in 100 patients each of AMI (within 24 h of onset), stable CAD and 100 age and sex matched healthy controls. These were again determined after 6 weeks in AMI patients. The mean serum PONase activity was lowest in AMI patients (23.26 U/ml) followed by stable CAD patients (102.0 U/ml) where as in controls was highest (179.8 U/ml). In patients with AMI, activity was significantly higher at 6 weeks as compared to that after acute event (49.39 %; p < 0.05). Sudden lowering of serum PONase activity in a population which already has lower activity may be one of the risk factors for development of AMI.