22 research outputs found

    Application of residue number systems to bent-pipe satellite communication systems

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    Conference Name:2011 6th International ICST Conference on Communications and Networking in China, CHINACOM 2011. Conference Address: Harbin, China. Time:August 17, 2011 - August 19, 2011.ICSTTo reduce the impact on the performance of satellites caused by space radiation environments, redundant structures are introduced into hardware design. Meanwhile, it brings in a new trouble, that is, a great deal of hardware resource is consumed. To overcome the problem, a lot of methods are proposed, one of which is using the residue number system (RNS). The RNS is proved to be suitable to all linear systems in this paper. Since the main modules of Bent-pipe (BP) satellites such as beam forming, finite impulse response (FIR) filters can be approximated to linear systems, RNS becomes an effective way to reduce the area overhead of hardware in BP mode satellite communication systems. ? 2011 IEEE

    The Theory and History of The Wedge Strategy:Implications for China's Foreign Policy

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    韩召颖,南开大学周恩来政府管理学院教授、博士生导师,历史学博士;黄钊龙,南开大学周恩来政府管理学院博士研究生。【中文摘要】联盟是国际关系的常见现象,如何与对手联盟相处也是国家经常面对的重要问题。当面对一个敌对性同盟,如何使权力斗争的结果于己更为有利,不仅涉及加强军备和结盟,也关乎对敌对同盟的分化。实际上,楔子战略正是国际关系学者对这一重要问题“理论化”的成果。根据对敌对联盟不同成员采取的手段不同,楔子战略具体可分为奖赏、选择性奖赏、对抗和选择性对抗四种类型。从现有理论研究看,将楔子战略作为一类外交行为规律的探索是重点。通过拓展研究视野可以发现,预阻敌对联盟的形成或对敌对联盟进行分化、瓦解的思想智慧由来已久,且不仅仅局限于西方的实践,中国春秋战国时期的“合纵连横”就是其中的代表。结合楔子战略的相关理论内涵与中国面临美国联合“遏制”的现实,准确识别目标对象的利益诉求,在“因国制宜”和慎用强制的原则基础上追求对美国遏华“战略包围圈”进行“重点性预阻”与“技巧性分化”是中国周边外交的努力方向 。 【Abstract】In international relations,the study of how states interact with the alliances of rivals is significant. In particular ,how to initiate beneficial strategic circumstances for itself when faced with a rival alliance is critical for a state in terms of not only strengthening its own military force and alliance with other states,but also alienating its primary rivals. As such,the Wedge Strategy is a product of the “theoretic development” centered on this academic discourse. Stemming from this discourse,the Wedge Strategy can be classified into four categories: reward,selective reward,confrontation,and selective confrontation. We can discern that the thought of pre-alignment and dis-alignment have existed for a substantial length of time,that it is not limited to the practice of contemporary Western strategic thought,and that it is also a recurrent strategic feature during the Spring Autumn and the Warring States period in China. Based on the Wedge Strategy theory and the reality that China is increasingly confronted with the joint “containment” orchestrated by the U. S.,Beijing should conscientiously recognize the needs of the target states along its periphery.Further,in accordance with the principle of cautious coercion,China should act on the different policies formulated by different states to prevent the target state from either allying with U. S. or initiating close strategic alignment with Washington,and prudently endeavor to alienate the U.S. alliance system.国家社会科学基金重大项目“中国构建新型大国关系的实践探索研究”(13&ZD049

    C反应蛋白-甘油三酯-葡萄糖指数与进展性卒中的相关性研究(Study on the Correlation between C-reactive Protein-Triglyceride Glucose Index and Progressive Stroke)

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    目的 评估C反应蛋白-甘油三酯-葡萄糖指数(C-reactive protein-triglyceride glucose index,CTI)对进展性卒中的影响,为该类患者的炎症、血糖及血脂水平综合管理提供新的证据和指导。 方法 本研究纳入了2019年1月—2024年12月在沧州市人民医院就诊的1355例缺血性卒中患者,终点事件为住院期间是否发生进展性卒中。采用logistic回归分析、亚组分析、ROC曲线探讨CTI与进展性卒中的关系。 结果 共365例(26.94%)患者发生进展性卒中。校正混杂因素后,多因素logistic回归分析显示,CTI(OR 2.230,95%CI 1.957~2.542,P<0.001)是进展性卒中的独立危险因素,最高四分位区间患者比最低四分位区间患者的进展性卒中发生风险高3.016倍(OR 4.016,95%CI 1.946~8.290,P<0.001)。亚组分析显示,CTI在年龄、性别、吸烟史、饮酒史、高血压病史、糖尿病病史、冠心病病史亚组中仍保持上述关系,且与年龄、高血压病史、糖尿病病史之间存在交互作用。ROC曲线分析显示,C反应蛋白(C-reactive protein,CRP)预测进展性卒中的AUC为0.690(95%CI 0.660~0.720),甘油三酯-葡萄糖(triglyceride-glucose,TyG)预测进展性卒中的AUC为0.614(95%CI 0.588~0.640),CTI预测进展性卒中的AUC为0.711(95%CI 0.686~0.735),CTI的预测价值高于CRP(Z=1.958,P=0.043)和TyG(Z=6.565,P<0.001)。 结论 CTI对进展性卒中具有一定的独立预测价值,这一综合了炎症、血糖及血脂水平的指标能够进一步提升预测进展性卒中的准确性,具有更佳的临床应用前景。Abstract: Objective To assess the effects of the C-reactive protein-triglyceride glucose index (CTI) on progressive stroke, and to provide new evidence and guidance for the comprehensive management of inflammation, blood glucose, and lipid levels in such patients. Methods This study included 1355 patients with ischemic stroke who were admitted to the Cangzhou People’s Hospital from January 2019 to December 2024. The endpoint event was the occurrence of a progressive stroke during hospitalization. Logistic regression analysis, subgroup analysis, and the ROC curve were used to investigate the relationship between the CTI and progressive stroke. Results A total of 365 patients (26.94%) experienced progressive stroke. After adjusting for confounding factors, multivariate logistic regression analysis revealed that CTI (OR 2.230, 95%CI 1.957-2.542, P<0.001) was an independent risk factor for progressive stroke. The risk of progressive stroke in the highest quartile range was 3.016-fold higher than that in the lowest quartile range (OR 4.016, 95%CI 1.946-8.290, P<0.001). The subgroup analysis revealed that CTI maintained this relationship in subgroups of age, gender, history of smoking, history of drinking, history of hypertension, history of diabetes mellitus, and history of coronary heart disease, and showed interaction with age, history of hypertension, and history of diabetes mellitus. ROC curve analysis showed that the AUC of C-reactive protein (CRP) for predicting progressive stroke was 0.690 (95%CI 0.660-0.720), that of the triglyceride-glucose (TyG) index was 0.614 (95%CI 0.588-0.640), and that of CTI was 0.711 (95%CI 0.686-0.735). The predictive value of CTI was higher than that of CRP (Z=1.958, P=0.043) and TyG (Z=6.565, P<0.001). Conclusions CTI has a certain independent predictive value for progressive stroke. This integrated indicator, which combines inflammation, blood glucose, and lipid levels, can further improve the accuracy of predicting progressive stroke, and thus has better prospects for clinical application

    Temperature monitoring system for HV bus-bar based on wireless networking

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    针对高压开关柜的高压、强电磁场的工作环境,本文设计一种基于ZigBee无线网络技术的高压开关柜母线测温系统。该系统由温度在线监测显示设备和温度终端采集设备两部分构成,温度终端采集设备采用耐腐蚀绝缘技术,直接将其安装在被测母线上进行温度采集,并将母线上采集到的温度以无线的方式传递给温度在线监测显示设备。由于每个开关柜内每条母线上的温度终端采集设备都被分配固定的地址,所以温度在线监测显示设备能将接收到的数据进行分析处理后,直接在液晶上实时在线显示开关柜内对应地址的温度数据。当采集的温度数据超过系统设定阈值时,显示装置发出声光报警信号,从而使用户提前发现和排除热故障隐患。 &nbsp

    環境および廃炉試料中のアクチニドの迅速定量のためのフッ化水素アンモニウムを用いた低温溶融抽出法の確立

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    近年、環境放射能に関する研究だけでなく、原子力緊急時の対応や原子炉廃止措置の作業においても、迅速にアクチニドが定量できる分析法の検討が必要とされている。従来の試料分解法には、試料に硝酸、過塩素酸とフッ酸を加えた加熱する方法が用いられてきた。これは混合酸を用いるために、試料の熱分解や高温の溶融操作に長時間を要し、実験室やその施設への負担を考慮する必要もあった。試料の分解は、アクチニドの定量手順において最初のステップであり、慎重な操作が求められてきた。また溶融は高温のためにマッフル炉内で行われてきた。 そこで本研究では、環境試料及び放射性廃棄物中のネプツニウム-237(237Np)とプルトニウム(Pu)同位体を定量するための環境に優しい迅速分析法を確立した。本法は、低温フッ化水素アンモニウム(NH4HF2)溶融法に、フッ化カルシウム(CaF2)/フッ化ランタン(LaF3)共沈法、抽出クロマトグラフィーおよびICP-MS測定のための手順を組合せた。従来の溶融法は高温(600-1200℃)でマッフル炉が用いられてきたが、本法は市販のホットプレートを用いて、温度250℃で15分間の加温だけで、溶融が完了した。土壌、海洋堆積物およびコンクリート試料(0.5〜1g)を、開発した低温NH4HF2溶融法とクロマトグラフィーによる分離精製過程を組合せた結果、237NpとPu は70-90%以上の化学回収率が得られた。つまり試料から難溶性Puの抽出することができるだけでなく、約8時間で10サンプルの分析が可能となり、従来の試料分解法に比べて迅速に定量できることができた。また本法では、フッ化水素(毒物)を使用しないため、安全で環境に配慮した分析法と言える

    胰岛素样生长因子Ⅰ与透明质酸对人胚关节软骨细胞表型的影响

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    【目的】研究胰岛素样生长因子Ⅰ(IGF-Ⅰ)和透明质酸(HA)联合培养对人关节软骨细胞生物学行为的影响, 判 断其稳定软骨细胞表型的效果。【方法】分离培养人关节软骨细胞, 从第4 代开始, 用hIGF-Ⅰ 和HA 联合培养, 通过电镜观 察、甲苯胺蓝染色、Ⅱ 型胶原和aggrecan 免疫组化及RT-PCR 判断联合培养第8 代软骨细胞表型的变化。自然传代的第6 代 细胞为对照组。【结果】IGF-Ⅰ 和HA 联合培养的第8 代细胞胞浆内含有丰富的粗面内质网和分泌小泡;RT-PCR 显示Ⅱ 型胶 原mRNA 表达阳性而Ⅰ 型胶原mRNA 表达阴性;甲苯胺蓝染色显示细胞浆内有大量的紫色异染颗粒;Ⅱ 型胶原和agg recan 免疫组化见80 %~ 92 %的细胞染色呈阳性或强阳性, 平均灰度分别为85.92 和116.23, 均显著低于对照组, 说明处理组染色 较对照组增强。【结论】IGF-Ⅰ 和HA 联合培养的第8 代细胞仍能保持透明软骨细胞的表型, 为体外获得高数量级别的有正 常功能的人关节软骨细胞提供一种新方法

    顶张力作用下东海高压立管稳定性分析

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    东海地质条件复杂,采用常规导管架模式进行油气资源开发经济风险较大。针对浅水区水下生产系统的部署,使用高压立管将会大大降低油气开发成本。本文采用有限元计算方法,对东海海域高压立管及水下井口系统的响应情况进行分析。研究主要关注系统在不同顶张力、高压立管壁厚、内压条件下的响应变化,判断结构能否满足安全要求。结果表明,增大顶张力有助于提高结构稳定性,但在生存工况下,提高顶张力的作用有限;顶张力增大后壁厚对响应的影响逐渐减弱,表明顶张力对高压立管整体刚度的贡献高于高压立管自身弯曲刚度的贡献;正常作业的内压工况下,能够通过提高顶张力的方式提供结构安全性,但在井喷的极高内压工况下,提高顶张力产生的作用有限,增大高压立管壁厚更为有效
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