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NOUS控制和PID控制的直流降压变压器控制性能对比 被引量:5
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作者 吴小康 SCHMID Robert +2 位作者 张帆 张莹冰 赵晋泉 《河海大学学报(自然科学版)》 CAS CSCD 北大核心 2020年第5期473-478,共6页
为了寻求更加优化的直流降压变压器控制系统,搭建了一台直流降压变压器并根据其参数建模,在此基础上分别设计了一种基于NOUS算法的状态空间控制系统、使用观测器的NOUS算法控制系统和PID控制系统。用示波器展示变压器在这3种控制系统下... 为了寻求更加优化的直流降压变压器控制系统,搭建了一台直流降压变压器并根据其参数建模,在此基础上分别设计了一种基于NOUS算法的状态空间控制系统、使用观测器的NOUS算法控制系统和PID控制系统。用示波器展示变压器在这3种控制系统下的阶跃响应输出和负载发生突变时的瞬态响应,以对比它们的控制性能。结果表明,基于NOUS算法的状态空间控制系统具有更好的瞬态响应和控制精确度,而PID控制系统在鲁棒性方面具有优势,使用观测器的NOUS算法控制系统仍保留了收敛速度快的优点,但会导致控制系统建模中的误差被放大,影响输出结果。 展开更多
关键词 直流降压变压器 状态空间控制 nous算法 观测器 PID控制 稳态误差 瞬态响应 鲁棒性 自动化控制
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Comparative study of intracavernous pressure and cavernous pathology after bilateral caver nous n erve crushing and resection in rats 被引量:2
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作者 Meng Li Yi-Ming Yuan +5 位作者 Bi-Cheng Yang Sheng-Ji Gu Hui-Xi Li Zhong-Cheng Xin Dong Fang Rui-Li Guan 《Asian Journal of Andrology》 SCIE CAS CSCD 2020年第6期629-635,共7页
This study aimed to compare the effects of bilateral cavernous nerve crushing(BCNC)and bilateral cavernous nerve resection(BCNR)on intracavernous pressure(ICP)and cavernous pathology in rats and to explore the optimal... This study aimed to compare the effects of bilateral cavernous nerve crushing(BCNC)and bilateral cavernous nerve resection(BCNR)on intracavernous pressure(ICP)and cavernous pathology in rats and to explore the optimal treatment time for the BCNC and BCNR models.Seventy-two male rats aged 12 weeks were randomly divided into three equal groups:Sham(both cavernous nerves exposed only),BCNC(BCN crushed for 2 min),and BCNR(5 mm of BCN resected).Erectile function was then measured at 1 week,3 weeks,and 5 weeks after nerve injury,and penile tissues were harvested for histological and molecular analyses by immunohistochemistry,immuno fluoresce nee,Western blot,and cytokine array.We found that erectile function parameters including the maximum,area,and slope of ICP/mean arterial pressure(MAP)significantly decreased after BCNR and BCNC at 1 week and 3 weeks.At 5 weeks,no significant differences were observed in ICP/MAP between the BCNC and Sham groups,whereas the ICP/MAP of the BCNR group remained significantly lower than that of the Sham group.After BCNC and BCNR,the amount of neuronal-nitric oxide synthase-positive fibers,smooth muscle cells,and endothelial cells decreased,whereas the amount of collage n III con tent increased.These pathological cha nges recovered over time,especially in the BCNC group.Our fin dings demonstrate that BCNC leads to acute and reversible erectile dysfunction,thus treatme nt time should be restricted to the first 3 weeks post-BCNC.In contrast,the self-healing ability of the BCNR model is poor,making it more suitable for long-term treatment research. 展开更多
关键词 caver nous nerve crushing cavernous nerve resection erectile dysfunction in tracavernous pressure
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LE CIEL VA-T-IL NOUS TOMBER SUR LA T TE ?
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《法语学习》 2000年第6期54-56,共3页
关键词 SUR LE CIEL VA-T-IL nous TOMBER SUR LA T TE IL VA
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基于VAR模型的中国住宅价格体系的实证研究 被引量:5
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作者 姚玲珍 韩国栋 《经济问题》 CSSCI 北大核心 2011年第5期53-57,共5页
采用1998~2009年中国豪华住宅销售价格指数、普通住宅销售价格指数和经济适用房销售价格指数的季度数据作为样本,通过建立VAR模型,利用脉冲响应函数和方差分解进行实证研究。研究结果表明:豪华住宅售价、普通住宅售价和经济适用房售价... 采用1998~2009年中国豪华住宅销售价格指数、普通住宅销售价格指数和经济适用房销售价格指数的季度数据作为样本,通过建立VAR模型,利用脉冲响应函数和方差分解进行实证研究。研究结果表明:豪华住宅售价、普通住宅售价和经济适用房售价三者间具有长期均衡关系,短期内豪华住宅售价波动对其他售价的影响相对较大,而长期内经济适用房售价波动对其他售价的影响相对较大。在此基础上,提出当前宏观调控的政策建议。 展开更多
关键词 VAR模型 住宅价格体系 脉冲效应函数 方差分解
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Research on Networked Rapid Product Development Process
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作者 NI Yan-rong, FAN Fei-ya, JIN Ji-wen, YAN Jun-qi (CIM Institute, Department of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期158-159,共2页
Today the cycle time of the product develop is requ ir ed to be shortened. At the same time the requirement of the customers becomes mo re and more diverse and complex. The capability of the develop unit is limited b ... Today the cycle time of the product develop is requ ir ed to be shortened. At the same time the requirement of the customers becomes mo re and more diverse and complex. The capability of the develop unit is limited b ecause of the existence of heterogeneous systems and distributed environments. I n this paper, we bring forward a new approach to solve the problem in product de velopment process. We also settle part key technologies in it. A great deal of information from all kinds of sources in the distributed develop ment process is interweaved. The solution to organize the workflow and manage th e information in the process is called for anxiously. We use a new approach that is asynchronous and synchronous coupling product development approach based on the network. The approach extends the develop process from the time axis. Then t he activities in the process are organized from the asynchronous and synchronous aspects. The state of every activity projects at the ASN (active semantic netwo rk). The ASN includes decision system, intelligent agent, user interface and net work. The ASN decides the types and states of the activities and deals with the couple relationship among them. The knowledge stored in ASN is open to all users through the relative interfaces. Every specialist keeps contact with their user s relying on collaborative platform implements CSCW (computer support collaborat ive work) that integrated product/process design and development. The lack of gl obal communication in product development process can be prevented in the most d egree. The key technologies that exist in the asynchronous and synchronous coupling pro duct develop approach include: integrated development structure, orderly organiz ation of information, transparent management of process, agile transfer of infor mation and rapid prototype. The development process can be completed quickly by these technologies. The technologies involve wide content. In this paper, we dis cuss some key technologies. We validate the approach by the projectrapid response manufacturing a pplication in the distributed environment. The expensive device, high technology and low using lead to RE (Rapid engineering) and RP (Rapid prototype) service a pplication by the network. RE and RP develop rapidly due to the accelerated prod uct development process. RE and RP application service platform is built in the project. 展开更多
关键词 distributed environment asynchronous and synchro nous coupled active semantic network product development process
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Research on High Discharge Efficiency in SMPDP
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作者 况亚伟 H.TOLNER +3 位作者 李青 朱笛 崔渊 张雄 《Plasma Science and Technology》 SCIE EI CAS CSCD 2010年第1期95-98,共4页
The relationship between infrared light (IR) and vacuum ultraviolet (VUV) emission in shadow mask plasma display panels (SMPDP) at high xenon content and high voltage is investigated. The respective ratios of VI... The relationship between infrared light (IR) and vacuum ultraviolet (VUV) emission in shadow mask plasma display panels (SMPDP) at high xenon content and high voltage is investigated. The respective ratios of VIS/IR-823 am, VIS/IR-828 nm and of efficacy/VIS/IR-823 nm, efficacy/VIS/IR-823 nm are calculated to determine the behavior of the xenon excitation efficiency and the electron excitation efficiency as a function of the driving voltage and xenon content. It is found that the xenon excitation efficiency is almost independent of the driving voltage, and increases approximately linearly with the xenon content. The values for efficacy/VIS/IR-828 nm increase rapidly with the xenon content, but saturate at a xenon ratio of about 30% while, on the other hand, the efficacy/VIS/IR-823 nm values decrease continuously with the xenon content. 展开更多
关键词 plasma display panel shadow mask plasma display panels high xenon lumi- nous efficacy discharge efficiency
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The Hindu Aristotle
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作者 Bradley Y. Bartholomew 《Journal of Philosophy Study》 2016年第10期604-615,共12页
This paper presents an original interpretation of the Upanishads that the inner self is located in the embryo brain region of the brain. This is the part of the brain already present in the embryo and consists of the ... This paper presents an original interpretation of the Upanishads that the inner self is located in the embryo brain region of the brain. This is the part of the brain already present in the embryo and consists of the brainstem, hypothalamus, thalamus, and midbrain. It is also the part of the brain that operates during dreaming and deep sleep and causes the transition from sleeping to waking states, and the Upanishads state unequivocally that the self is responsible for these mental states. With the self located in the embryo brain region, an entirely new interpretation of Aristotle's De Anima is presented which parallels the Upanishads in every respect; the inner self and Aristotle's "soul" have identical functions and attributes. An Aristotelian First Principle is presented: Biology is the source of Consciousness; DNA is the source of Biology; Ergo DNA is the source of Consciousness. 展开更多
关键词 PSYCHE nous METAPHYSICS PYTHAGORAS REM sleep substance form matter Plato respiration
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回春口服液对小鼠肝肾心脑组织的影响
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作者 罗蓉 钱永龄 +5 位作者 周灵 肖顺汉 刘德琪 王有模 邬关德 吕廉捷 《四川生理科学杂志》 1995年第4期10-11,共2页
通过回春口服液对小鼠肝肾心脑组织和细胞微细结构的影响进行分析,结果表明,回春口服液具有使衰老小鼠肾基底膜变薄,肝细胞内糖原增多,双核增多,改善心肌出血、坏死、脂肪浸润和水肿以及脑组织变性作用。
关键词 回春口服液 衰老小鼠
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论教育信息技术内生资源之困境及解决对策
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作者 刘澍 《中国大学生就业》 2012年第4期3-6,共4页
现代教育信息技术作为一种蕴涵更多外来文明意味的新教育程式,其在文化属性、理论基础、行动模式、实践操作等诸多方面与我国传统教育学习模式存在诸多无法契合的迹象。现代教育信息技术内生资源困境只有通过多维融合的本土化过程才能... 现代教育信息技术作为一种蕴涵更多外来文明意味的新教育程式,其在文化属性、理论基础、行动模式、实践操作等诸多方面与我国传统教育学习模式存在诸多无法契合的迹象。现代教育信息技术内生资源困境只有通过多维融合的本土化过程才能得以解决。 展开更多
关键词 教育信息技术 教育体制 自主理性 主体地位
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客运架空索道的设计
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作者 嵇焕章 《矿山机械》 北大核心 1992年第10期29-32,共4页
介绍了设计客运架空索道需要的基础资料,如何选择索道型式和设计中应注意事项及其经验教训。
关键词 站房 线路 承载索 架空索道 客运
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