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Search Results: 1 - 10 of 63691 matches for " Hui Xu "
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Regional R&D Investment and New Product Development Performance of Enterprises under the Background of Knowledge Activities  [PDF]
Hui Xu
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.63013
The theory of innovation factor thinks that regional research and development (R&D) investment directly affects the new product development (NPD) performance of the enterprise, while the theory of innovation efficiency considers that regional R&D investment affects the NPD performance of the enterprise by affecting the enterprise internal R&D efficiency. To test the two-theoretical hypothesis, we match up Chinese provincial-level data with the enterprise data from China industrial enterprise database. The empirical results show that, the theory of innovation factor and the theory of innovation efficiency exist simultaneously. The regional R&D investment can affect NPD performance of enterprises. However, R&D investment of other enterprises in the same region has a beneficial impact on the enterprise internal R&D efficiency. And the regional R&D investment in human resources has a positive effect on the enterprise internal R&D efficiency. According to the conclusions, this paper constructs three policy advices, which are increasing regional R&D investment, expanding and consolidating the enterprise as the core of the status of R&D and increasing regional R&D investment in human resources.
Value Added Decomposition of Chinese Provincial Exports and Its Assessment of True Comparative Advantage: A Case Study of Manufacturing in Jiangsu Province  [PDF]
Hui Chen, Jian Xu
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.73032
Abstract: The Sino-US trade conflict, the collapse of economic globalization and the reconstruction of global value chains have enhanced the necessity and urgency of building an open and connected, self-controllable, domestic value chain. Jiangsu is a major province and a large open province. The goal, path and measures for Jiangsu to build an independent and controllable advanced manufacturing system will have typical reference value. Based on the KWW trade value added decomposition framework, the World Input-Output Table (WIOT) and the inter-regional input-output tables of 30 provinces in China, Jiangsu’s return domestic value added, foreign value added, province value added and other provinces’ value added in Jiangsu’s manufacturing exports are estimated. Meanwhile, the regional linkages and changes of Jiangsu’s manufacturing exports with the rest of the provinces are also analyzed. The results show that the value added of imports from Jiangsu exports is higher than that of other provinces, which indicates that the “foreign circulation” of Jiangsu’s economy is stronger than “domestic circulation” though the situation is always changing in recent years. The Yangtze River Delta region is the core space for Jiangsu to build manufacturing industry chain. The Yangtze River Economic Belt and the Huaihai Economic Zone, which is the part of new Silk Road, are two important extended spaces for Jiangsu to build up NVC. Finally, On the basis of the decomposition of export value added, the industries with real comparative advantages in 16 major manufacturing industries in Jiangsu Province are evaluated. Both the advantages and disadvantages of Jiangsu’s value chain upgrading at the industrial level are unveiled.
A Regional University-Industry Cooperation Research Based on Patent Data Analysis
Hui Xu
Asian Social Science , 2010, DOI: 10.5539/ass.v6n11p88
Abstract: Regional university-industry cooperation has been focused because it improves innovation ability of enterprises and regions. The paper uses regional patent data from 2001 to 2008 to measure regional university-industry cooperation. By carefully data disposition, we get patent data records representing regional university–industry collaboration. Through patent data analysis from different angles and comparison of geographic knowledge flows, this paper describes the situation of regional university-industry cooperation. Then social network analysis method is adopted to depict how universities, scientific research institutes and enterprises co-work to innovate. In virtue of the method, we acquire visualization of cooperation microstructure. Five kinds of sub cooperation network are distinguished to study the cooperation. These findings can be used to measure regional university-industry cooperation and put forward improving suggestions.
A Research of Entrepreneurial Environment Evaluation of Shenzhen Based on GEM
Hui Xu
Journal of Sustainable Development , 2010, DOI: 10.5539/jsd.v3n3p151
Abstract: The paper investigates the current status of entrepreneurial environment in Shenzhen based on Global Entrepreneurship Monitor (GEM) model. Through expert interviews, I analyze nine aspects of entrepreneurial environment of Shenzhen and compare them with other GEM data. These aspects include financial support, government policies, government programs, education and training, research and development transfer, commercial and professional infrastructure, access to physical infrastructure, market openness and cultural and social norms.
Pontryagin’s Maximum Principle for a Advection-Diffusion-Reaction Equation  [PDF]
Youjun Xu, Cuie Xiao, Hui Zhu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.312258
Abstract: In this paper we investigate optimal control problems governed by a advection-diffusion-reaction equation. We present a method for deriving conditions in the form of Pontryagin’s principle. The main tools used are the Ekeland’s variational principle combined with penalization and spike variation techniques.
Cr(VI) Removal from Aqueous Solution by Chitosan/Carboxylmethyl Cellulose/Silica Hybrid Membrane  [PDF]
Xuemei He, Huidong Xu, Hui Li
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33C034

In the present study, chitosan/carboxymethyl cellulose/silica hybrid membrane (CS/CMC/Silica) was prepared by using chitosan and carboxymethyl cellulose in the presence of 3-glycidoxypro- pyltrimethoxysilane (GPTMS) as the crosslinking agent and used to remove Cr(VI) iron in effluent. The structure of CS/CMC/Silica hybrid membrane was characterized by FT-IR spectroscopy and scanning electron microscopy (SEM). The influence of Cr(VI) concentration, solution temperature, and pH, adsorption time on adsorption performance of hybrid membrane was investigated. Adsorption capacity increased with the increase of Cr(VI) concentration and absorbing time, and decreased with the increase of sorbent dosage and temperature. The adsorption equilibrium of Cr(VI) ion was attained within 60min of contact. The pseudo-second-order model fitted the kinetic data well.

Analysis of Meteorological Conditions for Fog and Haze in the Eastern and Central Regions of China during January, 2013  [PDF]
Ying Wu, Mengyao Lv, Linchang An, Hui Xu
Atmospheric and Climate Sciences (ACS) , 2017, DOI: 10.4236/acs.2017.74042
Abstract: Based on the data of conventional meteorological observation, NCEP reanalysis data and atmospheric composition observation, a comprehensive analysis of the three kinds of persistent fog and haze in eastern China in January 2013 was carried out. The results show that the process of persistent fog and haze is in the background of static weather, and the zonal circulation in the middle and high latitudes is not conducive to the south of the cold air. In the eastern part of China, near-surface wind speed is low under the controlled of pressure field, which is conducive to the formation and maintenance of haze. The formation of inversion layer, the height of the mixed layer, the stratified structure of the upper dry layer, the ground wind speed and so on can represent the static stability of the atmosphere. In the actual forecast, fog and haze can be distinguished from the angle of relative humidity, PM2.5 concentration, diurnal variation characteristics, mixed layer height and energy structure, industrial structure and local and surrounding economic development level.
C(aryl)-O Bond Formation from Aryl Methanesulfonates via Consecutive Deprotection and SNAr Reactions with Aryl Halides in an Ionic Liquid
Hui Xu,Yang Chen
Molecules , 2007, DOI: 10.3390/12040861
Abstract: An efficient K3PO4-mediated synthesis of unsymmetrical diaryl ethers using the ionic liquid [Bmim]BF4 (1-butyl-3-methylimidazolium tetrafluoroborate) as solvent has been developed. The procedure involves consecutive deprotection of aryl methane-sulfonates and a nucleophilic aromatic substitution (SNAr) with activated aryl halides.
Era of diagnostic and interventional ultrasound
Hui-Xiong Xu
World Journal of Radiology , 2011, DOI: 10.4329/wjr.v3.i5.141
Abstract: It is an era of diagnostic and interventional ultrasound (US). Various new techniques such as three-dimensional US (3D US), interventional US, and contrast-enhanced US (CEUS) have been introduced into clinical practice. Dr. Xu and his colleagues have taken advantage of these techniques and carried out a series of relevant studies. Their use of 3D US in the liver, gallbladder, liver tumor volumetry, guidance for ablation, and 3D CEUS has widened the application of 3D US in the clinic. They found that prognosis in patients with hepatocellular carcinoma (HCC) after thermal ablation with curative intent was determined by treatment response to ablation, pretreatment serum AFP, and liver function reserve. Tumor response to treatment was the most predictive factor for long-term survival. They compared the use of percutaneous microwave ablation and radiofrequency ablation for the treatment of HCC and found that both are effective methods in treating HCCs. The local tumor control, complications related to treatment, and long-term survival were equivalent for the two modalities. They first compared the enhancement patterns of HCC and intrahepatic cholangiocarcinoma (ICC) and proposed the diagnostic clues for ICC, liver angiomyolipoma (AML), gallbladder cancer, renal carcinoma, and renal AML, which have greatly enhanced the role of CEUS in the clinic. They also evaluated the diagnostic performance of CEUS in characterizing complex cystic focal liver lesions and the agreement between two investigators with different experience levels; and found that CEUS is especially useful for the young investigator. They assessed the effect of anti-angiogenic gene therapy for HCC treated by microbubble-enhanced US exposure and concluded that gene therapy mediated by US exposure enhanced by a microbubble contrast agent may become a new treatment option for HCC.
Contrast-enhanced ultrasound: The evolving applications
Hui-Xiong Xu
World Journal of Radiology , 2009,
Abstract: Contrast-enhanced ultrasound (CEUS) is a major breakthrough for ultrasound imaging in recent years. By using a microbubble contrast agent and contrast-specific imaging software, CEUS is able to depict the micro- and macro-circulation of the targeted organ, which in turn leads to improved performance in diagnosis. Due to the special dual blood supply system in the liver, CEUS is particularly suitable for liver imaging. It is evident that CEUS facilitates improvement for characterization of focal liver lesions (FLLs), detection of liver malignancy, guidance for interventional procedures, and evaluation of treatment response after local therapies. CEUS has been demonstrated to be equal to contrast-enhanced computed tomography or magnetic resonance imaging for the characterization of FLLs. In addition, the applicability of CEUS has expanded to non-liver structures such as gallbladder, bile duct, pancreas, kidney, spleen, breast, thyroid, and prostate. The usefulness of CEUS in these applications is confirmed by extensive literature production. Novel applications include detecting bleeding sites and hematomas in patients with abdominal trauma, guiding percutaneous injection therapy and therefore achieving the goal of using interventional ultrasonography in managing splenic trauma, assessing the activity of Crohn’s disease, and detecting suspected endoleaks after endovascular abdominal aneurysm repair. Contrast-enhanced intraoperative ultrasound (US) and intracavitary use of CEUS have been developed and clinically studied. The potential use of CEUS involves sentinel lymph node detection, drug or gene delivery, and molecular imaging. In conclusion, the advent of CEUS has greatly enhanced the usefulness of US and even changed the status of US in clinical practice. The application of CEUS in the clinic is continuously evolving and it is expected that its use will be expanded further in the future.
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