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Now showing items 97 - 112 of 1558

  • Does democracy cause trade policy liberalisation? Unpacking the black box of trade policy

    Chen, Chao   Li, Andrew X.  

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  • Managed honeybee colony losses of the Eastern honeybee (Apis cerana) in China (2011–2014)

    Chen, Chao   Liu, Zhiguang   Luo, Yuexiong   Xu, Zheng   Wang, Shunhai   Zhang, Xuewen   Dai, Rongguo   Gao, Jinglin   Chen, Xiao   Guo, Haikun   Wang, Huihua   Tang, Jiao   Shi, Wei  

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  • Numerical and experimental investigations of the reshaped joints with and without a rivet

    Chen, Chao   Zhao, Shengdun   Cui, Minchao   Han, Xiaolan   Ben, Ningyu  

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  • Central limit theorem for weighted local time of modulus of fractional Brownian motion

    Chen, Chao   Yan, Litan   Ju, Cheng  

    In this paper, we mainly prove a central limit theorem for weighted local time of -modulus of fractional Brownian motion with Hurst parameter . Similar to , based on techniques of stochastic analysis, the main ingredients of the proof are analogous to the asymptotic version of Knight’s theorem and the fractional Clark-Ocone formula for the -modulus of the weighted local time increments.
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  • Experimental Research on the Thermal Damage of Concrete

    Chen, Chao   Luo, Ying She   Tang, Song Hua   Zhang, Xuan  

    In order to investigate the effect of temperature (from normal temperature to 850 C) coursed by fire on the strength damage of concrete, thermal compression tests for concrete specimens named C35 have been performed under different temperature conditions. Emphasis is laid on the relationship between temperature and thermal damage strength; and the relevant formula is proposed in this paper. The regularity and mechanism of thermal damage evolution in concrete on strength under high temperature are analyzed. Combined the result of tests with the "residual strength" thermal damage model, we obtain the specific damage variable value D under different temperatures. Finally, we compare the fitting formula curve to relevant reference; there are some important conclusions which can be partly applied to fire design of concrete structure.
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  • DEVICE AND METHOD FOR COORDINATING MAGNETORHEOLOGICAL DAMPING/BRAKING AND ENERGY HARVESTING

    A device and method for coordinating magnetorheological (MR) damping/braking and energy harvesting (EH) in an MR damping/braking system (3000). The device comprises a divider (3110) configured to generate a first allocating signal and a second allocating signal based on a desired overall damping force/braking torque; an MR damping/braking controller (3120) configured to generate, in response to the first allocating signal, an MR command signal for generating an allocated MR damping force/braking torque; and an EH controller (3130) configured to harvest an allocated energy in response to the second allocating signal.
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  • Bandpass filters based on phase-shifted photonic crystal waveguide gratings

    Chen, Chao   Li, Xuechun   Li, Hanhui   Xu, Kun   Wu, Jian   Lin, Jintong  

    In this paper, a bandpass transmission filter realized in phaseshifted waveguide gratings based on photonic crystals (PCs) is proposed. Phase-shift regions each composed of one period of photonic crystal ( PC) waveguide are incorporated into PC waveguide gratings. The magnitudes of the phase-shifts are modified by involving small changes in the size of the border rods in the phase-shift regions. Using standard coupled-mode theory and finite-difference time-domain (FDTD) method, we show that by properly choosing the magnitudes of phase-shifts and the lengths of waveguide gratings, a flat-top and sharp roll-off response with a narrow bandwidth is theoretically and numerically achieved by the designed filter. A further analysis shows that the center frequency of the transmission band can be changed by altering the magnitude of the phase-shift and the response performance exhibits relaxed sensitivity to the phase-shift variation. As a specific application, we theoretically demonstrate a third-order Chebyshev bandpass filter based on compound phase-shifted PC waveguide gratings. The filter performance is suitable for dense wavelength-division-multiplexed (DWDM) optical communication systems with a channel spacing of 100-GHz. (c) 2007 Optical Society of America.
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  • METHOD AND ELECTRONIC DEVICE FOR VIRTUAL HANDWRITTEN INPUT

    An embodiment of the present invention provides a method and electronic device for virtual handwritten input. The method for virtual handwritten input comprises: the electronic device detecting and obtaining, in real time, position coordinates of a handwriting device in a virtual handwriting region, the virtual handwriting region being a region in which a distance-measuring detector in the electronic device can effectively measure distances; obtaining a trace formed by the position coordinates and, when determining that a current handwritten input is complete, obtaining the handwriting trace from the full handwritten input process; recognizing a character corresponding to the handwriting trace obtained, and then displaying the recognized character. The method and electronic device for virtual handwritten input provided by an embodiment of the present invention enables simple, convenient, and low-cost handwritten input.
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  • ACCESS NETWORK MANAGEMENT DEVICE, BASE STATION, USER EQUIPMENT TRACKING METHOD AND SYSTEM

    Provided are an access network management device, a base station, a user equipment tracking method and system. The method comprises: an access network management device sending track commands to a plurality of preset base stations, the access network management device receiving the tracking information reported by the base stations, the base stations receiving the track commands sent by the access network management device, and when a tracked user equipment accesses the base stations, the base stations starting tracking and sending the tracking information. The connections between the access network management device and the base station and the user equipment are highly matched, and the difficulty of network fault location is small.
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  • THIAZOLE COMPOUND, PREPARATION METHOD THEREOF AND USE THEREOF IN PHARMACEUTICAL PRODUCTION

    Disclosed are compounds as shown in general formula I and general formula II or N-oxides, pharmaceutically acceptable salts or solvates thereof, the preparation methods thereof and the use thereof in pharmaceutical production, especially the use thereof in combating tumours. Pharmacodynamic experiment results show that the compounds of formula I and formula II of the present invention have a significant anti-tumour effect, and especially have a significant effect on resisting human multiple myeloma cells. Therefore, the compounds of the present invention can be used in the preparation of drugs for preventing or treating tumour-related diseases.
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  • Correlation between CT perfusion parameters and Fuhrman grade in pTlb renal cell carcinoma

    Chen, Chao   Kang, Qinqin   Wei, Qiang   Xu, Bing   Ye, Hui   Wang, Tiegong   Lu, Yayun   Lu, Jianping  

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  • Characterization of basic physical properties of Sb2Se3and its relevance for photovoltaics

    Chen, Chao   Bobela, David C.   Yang, Ye   Lu, Shuaicheng   Zeng, Kai   Ge, Cong   Yang, Bo   Gao, Liang   Zhao, Yang   Beard, Matthew C.   Tang, Jiang  

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  • A Six Degree of Freedom Epicyclic-Parallel Manipulator

    Chen, Chao   Gayral, Thibault   Caro, Ste?phane   Chablat, Damien   Moroz, Guillaume   Abeywardena, Sajeeva  

    A new six-dof epicyclic-parallel manipulator with all actuators allocated on the ground is introduced. It is shown that the system has a considerably simple kinematics relationship, with the complete direct and inverse kinematics analysis provided. Further, the first and second links of each leg can be driven independently by two motors. The serial and parallel singularities of the system are determined, with an interesting feature of the system being that the parallel singularity is independent of the position of the end-effector. The workspace of the manipulator is also analyzed with future applications in haptics in mind. [DOI: 10.1115/1.4007489]
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  • Reconstruction of Proper Digital Nerve Defects in the Thumb Using a Pedicle Nerve Graft

    Chen, Chao   Tang, Peifu   Zhang, Xu  

    Background: Traumatic defects of the proper digital nerve in the thumb affect tactile perception of the thumb pulp. This article reports on the treatment of the defect using a pedicle nerve graft taken from the dorsal branch of the proper digital nerve of the index or long finger, or both. Methods: From May of 2006 to March of 2010, the pedicle nerve graft was used in 16 thumbs in 16 patients. There were 13 male and three female patients, with an average age of 33 years. Nerve repair was performed on one side in six thumbs and on both sides in 10 thumbs. The average length of the defects was 2.5 cm, between the middle of the distal phalanx and metacarpophalangeal joint. The average length of the nerve grafts was 2.7 cm. For comparison, we also collected a consecutive series of 27 patients with thumb proper digital nerve defects treated using a nonvascularized graft taken from the sural nerve (n = 15) or the medial antebrachial cutaneous nerve (n = 12). Results: At a mean follow-up of 22 months, the mean static two-point discrimination and Semmes-Weinstein monofilament scores on the thumb pulps were 6.7 mm and 3.62, respectively. The measurements of patients treated using nonvascularized nerve grafts were 9.4 mm and 3.90, respectively. The outcomes of the two groups were significantly different. Conclusions: The pedicle nerve graft is useful and reliable for reconstructing proper digital nerve defects in the thumb. Superior sensory recovery was achieved using vascularized instead of unvascularized nerve grafts. (Plast. Reconstr. Surg. 130: 1089, 2012.)
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  • A self-sensing magnetorheological damper with power generation

    Chen, Chao   Liao, Wei-Hsin  

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  • METHOD FOR EFFICIENTLY PREPARING DOPED OPTICAL FIBRE PREFORM AND DOPED OPTICAL FIBRE PREFORM

    Provided are a method for preparing a doped optical fibre preform and a doped optical fibre preform. The steps of the method are as follows: formulating a rare earth material or a functional metal material and a co-doping agent into a doping solution, mixing a high-purity quartz powder with the doping solution, drying same at a temperature of 100ºC - 150ºC for 12 - 48 h, crushing and screening same to obtain a doped quartz powder; depositing the doped quartz powder onto the surface of a target rod (1) to form a doped core layer (2); replacing the doped quartz powder with the high-purity quartz powder, and depositing the high-purity quartz powder onto the surface of the doped core layer to form a quartz outer cladding (3); and removing the target rod (1), and gradually collapsing the entirety formed from the doped core layer (2) and the quartz outer cladding (3) at a high temperature to obtain the doped optical fibre preform.
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