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Search Results: 1 - 10 of 17243 matches for " Zhaohui Zhong "
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Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators
Chung Chiang Wu,Zhaohui Zhong
Physics , 2010, DOI: 10.1021/nl1039549
Abstract: We report the capacitive spring softening effect observed in single-walled carbon nanotube (SWNT) nanoelectromechanical (NEM) resonators. The nanotube resonators adopt dual-gate configuration with both bottom-gate and side-gate capable of tuning the resonance frequency through capacitive coupling. Interestingly, downward resonance frequency shifting is observed with increasing side-gate voltage, which can be attributed to the capacitive softening of spring constant. Furthermore, in-plane vibrational modes exhibit much stronger spring softening effect than out-of-plan modes. Our dual-gate design should enable the differentiation between these two types of vibrational modes, and open up new possibility for nonlinear operation of nanotube resonators.
Page Charge of University Journals Should Be Balanced with their expenditure
高校学报版面费收支应当合乎规范

ZHONG ZhaoHui,
钟昭会

中国科技期刊研究 , 2010,
Abstract: 绝大多数高校学报已公开收取版面费,但有的存在着项目不明、标准不一、数量过高、使用不当等不规范现象,在一定程度上制约着学报质量的提高。期刊主管部门和主办单位应采取措施,加强管理,使其合乎规范。
Parametric amplification in single-walled carbon nanotube nanoelectromechanical resonators
Chung-Chiang Wu,Zhaohui Zhong
Physics , 2011, DOI: 10.1063/1.3627178
Abstract: The low quality factor (Q) of Single-walled carbon nanotube (SWNT) resonators has limited their sensitivity in sensing application. To this end, we employ the technique of parametric amplification by modulating the spring constant of SWNT resonators at twice the resonant frequency, and achieve 10 times Q enhancement. The highest Q obtained at room temperature is around ~700, which is 3-4 times better than previous Q record reported for doubly-clamped SWNT resonators. Furthermore, efficient parametric amplification is found to only occur in the catenary vibration regime. Our results open up the possibility to employ light-weight and high-Q carbon nanotube resonators in single molecule and atomic mass sensing.
Wafer Scale Homogeneous Bilayer Graphene Films by Chemical Vapor Deposition
Seunghyun Lee,Kyunghoon Lee,Zhaohui Zhong
Physics , 2010, DOI: 10.1021/nl1029978
Abstract: The discovery of electric field induced bandgap opening in bilayer graphene opens new door for making semiconducting graphene without aggressive size scaling or using expensive substrates. However, bilayer graphene samples have been limited to um size scale thus far, and synthesis of wafer scale bilayer graphene posts tremendous challenge. Here we report homogeneous bilayer graphene films over at least 2 inch x 2 inch area, synthesized by chemical vapor deposition on copper foil and subsequently transferred to arbitrary substrates. The bilayer nature of graphene film is verified by Raman spectroscopy, atomic force microscopy (AFM), and transmission electron microscopy (TEM). Importantly, spatially resolved Raman spectroscopy confirms a bilayer coverage of over 99%. The homogeneity of the film is further supported by electrical transport measurements on dual-gate bilayer graphene transistors, in which bandgap opening is observed in 98% of the devices.
Real Estate Enterprise Capital Structure Analysis and Optimization—The Case Study of Kaisa Group  [PDF]
Zhaohui Li
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.69092
Abstract: Real estate industry is one of the pillar industries of the national economy. As the real estate industry develops rapidly, this capital-intensive industry’s funds demand is soaring. Therefore, in order to guarantee the healthy development of the real estate industry, a reasonable structure of enterprise capital is very important. From the perspective of corporate capital structure, this article takes Kaisa as an example for analysis. Kaisa’s financing activities in recent years are combined to understand the overall financing situation, and then adopt relevant financial indicators to analyze Kaisa’s solvency comprehensively. After the defects of capital structures are identified, several suggestions in optimizing capital structure will be given.
Does China-US Trade Have an Impact on Employment of the United States?  [PDF]
Zhaohui Bi
Technology and Investment (TI) , 2017, DOI: 10.4236/ti.2017.83014
Abstract: International trade’s real impact on domestic employment has always been controversial. In the 2016 presidential election, Donald Trump strongly argued that China-US Trade had resulted in many unemployed since China’s accession to the WTO. Does China-US trade have an impact on the United States employment, and how does it affect employment? This is the main issue discussed in this paper. In the first part, this paper briefly introduces the status of China-US trade and the United States employment. Then, the second part discusses whether China-US trade has an impact on employment in the US and how it affects employment, and mainly argues allocation costs and adjustment costs of trade shocks as well as other factors of high unemployment of the United States, such as technology. The third part will give some advice about the problem of unemployment in the United States. The final part is a conclusion.
Preparation and properties of CdS/Au composite nanorods and hollow Au tubes
ZhaoHui Yang,HaiBin Chu,Zhong Jin,WeiWei Zhou,Yan Li
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-0061-2
Abstract: 1-dimensional (1D) metal-semiconductor nano-scale composite superstructures based on Au nanoparticles and CdS nanorods were prepared. The outer surface of CdS nanorods was modified with mercapto-ethylamine (MEA) in advance. With the aid of MEA, dense and uniform Au nanoparticles were deposited onto the external wall of CdS nanorods through in situ chemical reduction of AuCl4 ions. Those Au nanoparticles induced further electroless deposition and a continuous layer of Au was formed on CdS nanorods. Stable hollow Au tubes were obtained after the inner CdS cores were etched by HCl. UV-Vis, FL, XPS, EDX, TEM and SEM measurements were carried out to characterize the produced materials. The quenching of the defect emission of CdS in CdS-nanorod/Au-nanoparticle hybrid superstructures was detected, which was ascribed to the energy transfer from the exciton of CdS to surface plasma resonance level of Au.
Carboxymethyl ursolate monohydrate
Yan Zhong,ZhaoHui Dai,YanBo Teng,Bin Wu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811001619
Abstract: In the title compound, C28H50O5·H2O, all of the six-membered rings of the pentacyclic triterpene skeleton adopt chair conformations. In the crystal, molecules are linked by O—H...O and C—H...O hydrogen bonds.
A Rare ParaneoplasticDermatomyositis in Bladder Cancer with Fatal Outcome
Ran Xu,Zhaohui Zhong,Hongyi Jiang,Lei Zhang
Urology Journal , 2013,
Abstract: No Abstract
Ultrafast photocurrent measurement of the escape time of electrons and holes from carbon nanotube PN junction photodiodes
Nathaniel M. Gabor,Zhaohui Zhong,Ken Bosnick,Paul L. McEuen
Physics , 2011, DOI: 10.1103/PhysRevLett.108.087404
Abstract: Ultrafast photocurrent measurements are performed on individual carbon nanotube PN junction photodiodes. The photocurrent response to sub-picosecond pulses separated by a variable time delay {\Delta}t shows strong photocurrent suppression when two pulses overlap ({\Delta}t = 0). The picosecond-scale decay time of photocurrent suppression scales inversely with the applied bias VSD, and is twice as long for photon energy above the second subband E22 as compared to lower energy. The observed photocurrent behavior is well described by an escape time model that accounts for carrier effective mass.
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