GaN-baseddilute magnetic semiconductors (dMS) have recently been investigated for use in spintronic devices. In particular, Gd-doped GaN has shown very promising room temperature ferromagnetic behavior and potential ...
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GaN-baseddilute magnetic semiconductors (dMS) have recently been investigated for use in spintronic devices. In particular, Gd-doped GaN has shown very promising room temperature ferromagnetic behavior and potential for use in spintronics applications. III-Nitride materials have recently had their thermoelectric properties investigated; however this work has not been extended to Nitride-baseddMS. Understanding the spin-calorimetric characteristics of GaN-baseddMS is important to the successful development of low-power spintronic devices. In this paper the Seebeck and spin-Seebeck effect in MOCVd grown Gd-doped GaN (Gd: GaN) are investigated.
The small effective mass of Bi, high anisotropy of its Fermi surface, and the high aspect ratio (length/diameter) of Bi nanowires make this an excellent system for studying quantum confinement effects of a one-dimensi...
The small effective mass of Bi, high anisotropy of its Fermi surface, and the high aspect ratio (length/diameter) of Bi nanowires make this an excellent system for studying quantum confinement effects of a one-dimensional (Id) electron gas in relation to electrical conductivity, thermoelectric power, and thermal conductivity. A theoretical model based on the basic electronic band structure of bulk Bi is suitably modified to describe 1d bismuth nanowires and is used to predict the dependence of these transport properties on nanowire diameter, temperature and crystalline orientation of the bismuth nanowires. Experiments have been carried out on ultra-fine single crystal Bi nanowires (10–120 nm diameter) with a packing density as high as 7 × 1010 wires/cm2 to test the quantum confinement assumptions of the model and the occurrence of a quantum confinement-induced semimetal-to-semiconductor transition as the wire diameter becomes less than 100 nm. Prospects for the use of bismuth nanowires for thermoelectric applications are discussed.
As the industries of cell phone and LCd TV were vigorously flourishing and the manufacturing requirements for LCd glass substrate were getting higher, the thermal fracture cutting technology (TFCT) has progressively b...
As the industries of cell phone and LCd TV were vigorously flourishing and the manufacturing requirements for LCd glass substrate were getting higher, the thermal fracture cutting technology (TFCT) has progressively become the main technology for LCd glass substrate cutting. due to using laser as the heat source, the TFCT has many advantages, such as uniform heating, small heat effect zone, and high cutting speed, smooth cutting surface and low residual stress, etc. Moreover, a general laser ablation processing or traditional diamond wheel cutting does not have the last two advantages. The article presents a mixed processing of glass substrate, which consists of TFCT and laser ablation mechanisms, and how to enhance the cutting speed with little ablation laser energy. In this study, a 10W Nd:YAG laser and a 40W CO2 laser are used as the heat source of TFCT and laser ablation processing, respectively. The result indicates that the speed of the mixed processing is more than twice the speed of TFCT. Furthermore, after the mixed processing, the residual stresses in the glass substrates are also smaller.
The breakdown strength of vegetable-based oil (VBO) and mineral oil is compared by means of experimental determination of breakdown voltage. These oils were tested under AC and positive lightning impulse voltages for ...
The breakdown strength of vegetable-based oil (VBO) and mineral oil is compared by means of experimental determination of breakdown voltage. These oils were tested under AC and positive lightning impulse voltages for uniform and non-uniform electrical field. The oil gap varied from 2 mm up to 85 mm. The results show same or higher AC breakdown strength of VBO compared to mineral oil for small gaps and uniform electrical field, whereas for lightning impulses and non-uniform field breakdown strength of VBO is reduced.
In recent, control approaches for the human-like behavior in the field of service robotics have been attracting considerable attention, since most humans or animals perform various tasks uncomplicatedly. Hence simple ...
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In recent, control approaches for the human-like behavior in the field of service robotics have been attracting considerable attention, since most humans or animals perform various tasks uncomplicatedly. Hence simple control methods based on gaining a physical insight into human reaching movement in redundancy of dOFs have been proposed. In comparison with the conventional approaches, the proposed method tries to control directly robotic systems in task-space with the control signal composed of linear superposition of three terms 1) joint-damping, 2) virtual spring, and 3) virtual damper in task-space. In particular, our work contains a muscle tension effect of a human under the gravity. This give birth to energy efficient natural motions avoiding problems on repeatability of the motion and ill-posedness problems emerged in most of redundant dOF systems. Thus, this paper exhibits expendability of the position control into the orientation control and compliant behavior. It is verified with a real robotic arm that satisfies human-like movements and motion repeatability under kinematic redundancy of joints.
Owing to the dynamical, heterogeneous, complex anddistributed attributes of grid information, it is hard to make a normal and uniform description. How to construct an overlay structure to support the standardized mod...
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Owing to the dynamical, heterogeneous, complex anddistributed attributes of grid information, it is hard to make a normal and uniform description. How to construct an overlay structure to support the standardized modeling is a key research matter. In this paper, we describe an extensible framework for grid information service virtualized process. We begin the study with grid information and service virtualization. Then the grid information service virtualized process is divided into three levels: category, cluster and service, in which the construction and maintenance methods are studied. The grid information joining, leaving and updating are also analyzed. Finally, the space and time complexities are analyzed, and conclusions and future work are made.
We have successfully fabricated 4.75-inch CNT-FEd with sturdy metal plates as spacer. The metal plates were etched numerous holes and coated oxide to supply high efficient passage for electrons. We observed that sever...
We have successfully fabricated 4.75-inch CNT-FEd with sturdy metal plates as spacer. The metal plates were etched numerous holes and coated oxide to supply high efficient passage for electrons. We observed that several metal plates not only helped cathode to shield high electric field from anode but also supplied sturdy spacer between cathode and anode. In this work, a uniformity lighting image is obtained and capable of being applied to large-area CNT-FEds.
In this paper, we develop an algorithm for PV(Photo Voltaic) generation forecasting on the day before. In this algorithm, we builddatabase of solarradiation patterns by analyzing past 5 years data from the weather c...
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In this paper, we develop an algorithm for PV(Photo Voltaic) generation forecasting on the day before. In this algorithm, we builddatabase of solarradiation patterns by analyzing past 5 years data from the weathercenter but deal with February data only. Therefore, we can estimate the amount of PV power generation forecasting in February from this algorithm. This algorithm will facilitate the renewable energy development and give useful information forrES providers to manage theirrES power generation schedule. We hope our proposal could help the PV module providers effectively manage their PV generation plan.
Silicon self-diffusion coefficients were measured in intrinsic and extrinsic silicon from870 to 1070°C using isotopically pure 30Si layer. 30Si diffusion profiles are determined by secondary ion mass spectrometry...
Silicon self-diffusion coefficients were measured in intrinsic and extrinsic silicon from870 to 1070°C using isotopically pure 30Si layer. 30Si diffusion profiles are determined by secondary ion mass spectrometry. The temperature dependence of intrinsic diffusion coefficient in bulk Si isobtained. Comparing it in heavily As-doped or B-doped Si, it is found that Si self-diffusion is entirely mediated by interstitialcy mechanism at lower temperatures below 870°C.
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