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力调制技术在区分聚合物薄膜晶畴、非晶畴中的应用
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作者 朱国栋 李杰 《电子显微学报》 CAS CSCD 北大核心 2003年第2期159-163,共5页
聚合物材料多为半晶态 ,晶畴和非晶畴共存。采用扫描探针显微术的力调制技术 ,成功区分出聚合物薄膜P(VDF TrFE)中存在的弹性性质相差悬殊的两类畴 :高弹性畴和低弹性畴 ,并推测高弹性畴对应于P(VDF TrFE)的晶畴。由此可见 。
关键词 力调制技术 扫描探针显微镜 聚合物薄膜 晶畴 非晶畴 Sneddon理论
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用气力调制技术提高空气输送斜槽的工作效率
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作者 乔龄山 《水泥》 CAS 北大核心 2010年第1期65-66,共2页
水泥离开磨机后都要经过一定时间的仓内贮存,尤其是水泥中转站的大型水泥仓贮存的时间还会更长。水泥颗粒间的内摩擦力大、黏附性强,若在仓内长时间不动极易压实、结块、黏壁和起拱棚仓,影响正常卸料。水泥仓底通常都辅有起吹松物料作... 水泥离开磨机后都要经过一定时间的仓内贮存,尤其是水泥中转站的大型水泥仓贮存的时间还会更长。水泥颗粒间的内摩擦力大、黏附性强,若在仓内长时间不动极易压实、结块、黏壁和起拱棚仓,影响正常卸料。水泥仓底通常都辅有起吹松物料作用的空气输送斜槽,在此又可称吹松板,但时间长了吹松板也不能完全消除上述弊端。 展开更多
关键词 空气输送斜槽 力调制技术 工作效率 水泥中转站 水泥仓 内摩擦 水泥颗粒 时间
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铁电共聚物薄膜微畴的直接观测
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作者 朱国栋 徐敬 李杰 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2003年第3期365-369,共5页
采用原子力显然镜的力调制技术 ,首次成功获得了偏二氟与三氟乙烯铁电共聚物 (P(VDF/TrFE) )薄膜样品高弹性畴和低弹性畴的图像 ,发现高、低弹性畴难以用表面形貌测定来加以区分 .推测高弹性畴对应于P(VDF/TrFE)的晶畴 .借助Sneddon理... 采用原子力显然镜的力调制技术 ,首次成功获得了偏二氟与三氟乙烯铁电共聚物 (P(VDF/TrFE) )薄膜样品高弹性畴和低弹性畴的图像 ,发现高、低弹性畴难以用表面形貌测定来加以区分 .推测高弹性畴对应于P(VDF/TrFE)的晶畴 .借助Sneddon理论 ,由在高。 展开更多
关键词 偏二氟与三氟乙烯共聚物 原子显微镜 力调制技术 高弹性畴 低弹性畴 Sneddon理论
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Employer Branding Management As A Strategic and Organizational Control Tool 被引量:1
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作者 Valentina Della Corte Gianluigi Mangia Clelia Cascella Giuseppina Zamparelli Andrea Tomo 《Chinese Business Review》 2012年第11期996-1014,共19页
The issue of employer branding has always had an intrinsic interdisciplinary content, since it builds a bridge for cross-fertilization between different disciplines (strategic marketing, strategic management, and hum... The issue of employer branding has always had an intrinsic interdisciplinary content, since it builds a bridge for cross-fertilization between different disciplines (strategic marketing, strategic management, and human resources management). This paper presents employer branding as an approach based on effective strategic organizational resources and a precise employer branding management process. In this paper, the target is to define a possible frame in order to interpret employer branding techniques as control and regulation mechanisms. Control in organizations has long been a topic of interest for researchers and practitioners, alike who generally recognize that control mechanisms are needed to ensure that organizations may achieve their goals. It has been carried out a field work on the Italian Aeronautical Meta district, that generates annual revenues equal to EUR 8.7 billion and employees 36,300 people, of whom approximately 10% are employed in the space sector. Through this field work, the intention aim is to understand if and how employer branding may create, enforce, and set up internal and shared meaning and values. In particular, stemming from the empirical research's evidences, this paper tries to conceptualize employer branding as a factor to persuade and influence the way that organizational actors enact in a socially constructed context. In this effort, the aim is to understand how managers may affect meanings, values goals, and opinions through an effective action on employer branding that can play a crucial role in affecting sense-making processes, meanings, interpretations of the symbolic environment. The paper therefore opens up to new horizons, since it embraces a new application for employer branding, considering it as a modern control system and proposing an innovative approach in managerial control, founded on organizational identity as a key concept in an organizational citizenship's perspective 展开更多
关键词 employer branding organizational control strategic control
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Control Strategies for PM Synchronous Machine Controlled Rectifier Intended for Heavy-Duty Vehicle 被引量:1
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作者 Alexandre De Bernardinis 《Journal of Energy and Power Engineering》 2013年第3期552-570,共19页
In order to charge batteries and supply all the electrical devices like wheel-motors used in a heavy-duty hybrid electric vehicle, a solution consists in using an assembly permanent magnet generator driven by a diesel... In order to charge batteries and supply all the electrical devices like wheel-motors used in a heavy-duty hybrid electric vehicle, a solution consists in using an assembly permanent magnet generator driven by a diesel engine and a three-phase insulated gate bipolar transistor/diodes bridge controlled rectifier connected to the battery. In this work, hysteresis current control strategies combined with a judicious current sensing mode for the assembly permanent magnet synchronous machine-controlled rectifier are investigated. Main issues first concern the different kinds of transistors switching modes allowed by the proposed current sensing mode when the machine operates either as a generator or as a motor. Second, the modulated hysteresis method is presented, which merges the performances of robustness and dynamic of the classical hysteresis method and imposes the switching frequency alike pulsewidth modulation techniques. A test bench at reduced power permits to test the switching modes as well as classical and modulated hysteresis methods for both motor and generator operating modes and to validate the simulation predictions. The digital signal processor algorithm elaborated for the control strategy is flexible and adaptable to all kinds of transistor switchings and machine operating modes. 展开更多
关键词 Hysteresis current control modulated hysteresis method PM synchronous machine hybrid electric vehicle.
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Power-line Modem over the Low Voltage Grid Using Direct Sequence Spread Spectrum Techniques
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作者 A. Mahgoub H. Abdeel-Baky E. El-Badawy 《Journal of Energy and Power Engineering》 2011年第6期562-568,共7页
Power-line networks are designed to deliver electricity. They reach most of the domiciles and other buildings nowadays, so most of the people have access to it. On the other hand the backbone for the communications ne... Power-line networks are designed to deliver electricity. They reach most of the domiciles and other buildings nowadays, so most of the people have access to it. On the other hand the backbone for the communications networks is not available in all countries especially the developing ones. A high cost and changing the design for the networks may be needed to construct this backbone. If data can be transmitted over the power-line networks, a recognized cost and time save can be achieved. In Egypt, the infrastructure is not always available for constructing a communications network backbone due to the already designed buildings before the need for these backbones. In this paper, we overcome this problem by designing a reliable Power-line Modem that operates safely on the low voltage grid. The modem is based on the Direct Sequence Spread Spectrum technique. It uses the mains zero crossing as an efficient way for the synchronization between the transmitter and the receiver. The Modem takes into account the problems of the Power-line including noise, attenuation and impedance dismatching. 展开更多
关键词 Power-line modem DS/SS micro-controller (firmware) low voltage grid.
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