Jianzheng Wang, Dein Shaw, O. Mahrenholtz,
Tópico(s): Structural Analysis and Optimization
1987 - Elsevier BV | Journal of Sound and Vibration
Jianzheng Wang, Xiaobo Huang, Jing Xiao, Wei Yu, Wei Wang, Weiyang Xie, Ying Zhang, Xiaojun Ma,
Abstract Alginate/chitosan polyelectrolyte complex (PEC) hybrid fibers are promising materials for scaffold‐making in tissue engineering. In this study, a new method termed “hydro‐spinning” was developed to make alginate/chitosan hybrid fibers. In hydro‐spinning, a chitosan solution was pumped into a flowing sodium alginate solution and sheared into streamlines. These elongated streamlines subsequently transformed into alginate/chitosan PEC ribbon‐like fibers before breaking up into pieces. Average ...
Tópico(s): Silk-based biomaterials and applications
2009 - Wiley | Journal of Biomedical Materials Research Part A
Jianzheng Li, Guochen Zheng, Junguo He, Sheng Chang, Zhi Qin,
A continuous stirred-tank reactor was used as an anaerobic sludge system and the hydrogen production capabilities of three typical fermentations, in terms of specific hydrogen production rates, were investigated under the same hydraulic retention times (8 h) and influent chemical oxygen demand (5000 mg/L) at 35 °C. The reactor was continuously fed with diluted molasses, while the pH and oxidation reduction potential in the reactor were regulated to control the type of fermentation. The specific hydrogen ...
Tópico(s): Microbial Fuel Cells and Bioremediation
2009 - Elsevier BV | Biotechnology Advances
Oscar A. Bizzozero, Jianzheng Zheng,
Abstract Nitrosative stress has been implicated in the pathophysiology of several CNS disorders, including multiple sclerosis (MS) and its animal model experimental autoimmune encephalomyelitis (EAE). We have recently shown that protein nitrosothiols (PrSNOs) accumulate in the brain of MS patients, and there is indirect evidence that PrSNO levels are also increased in EAE. In this study we sought to identify the major PrSNOs in the spinal cord of EAE animals prepared by active immunization of C57/BL6 ...
Tópico(s): Redox biology and oxidative stress
2009 - Wiley | Journal of Neuroscience Research
Lianqiao Yang, Jianzheng Hu, Moo Whan Shin,
Abstract In this letter, a theoretical degradation model of LEDs at dynamic working conditions was proposed. The Arrhenius effective temperature (AET) was used to describe the effect of dynamic working temperature. Utilizing the concept of AET, the lifetime prediction of LEDs at dynamic working conditions can be carried out based on the data base at steady state. It was found that the activation energy has a great effect on the numerical value of AET. The extraction of activation energy from steady ...
Tópico(s): Thin-Film Transistor Technologies
2009 - Elsevier BV | Solid-State Electronics
Yao Wang, Jianzheng Zhang, Wangqing Zhang, Minchao Zhang,
A porous, thermoresponsive and pH-responsive, and chelating hydrogel of poly(N-isopropylacrylamide)-co-poly[2-methacrylic acid 3-(bis-carboxymethylamino)-2-hydroxypropyl ester] (PNIPAM-co-PMACHE) is proposed as both a reaction medium and the Pd catalyst support for organic synthesis. Organic synthesis within the PNIPAM-co-PMACHE hydrogel has three merits. First, organic reactions such as Suzuki and Heck reactions within the hydrogel can be accelerated due to the enriched Pd catalyst and reactants ...
Tópico(s): Advanced Polymer Synthesis and Characterization
2009 - American Chemical Society | The Journal of Organic Chemistry
Qi Wang, Jing Shen, Zhenfu Li, Jianzheng Jie, Wenyue Wang, Jin Wang, Zhong-Tao Zhang, Zhixia Li, Li Yan, Jin Gu,
Abstract Background Surface enhanced laser desorption and ionization time-of-flight mass spectrometry (SELDI-TOF-MS) analysis on serum samples was reported to be able to detect colorectal cancer (CRC) from normal or control patients. We carried out a validation study of a SELDI-TOF MS approach with IMAC surface sample processing to identify CRC. Methods A retrospective cohort of 338 serum samples including 154 CRCs, 67 control cancers and 117 non-cancerous conditions was profiled using SELDI-TOF-MS. ...
Tópico(s): Biosensors and Analytical Detection
2009 - BioMed Central | BMC Cancer
Yao Wang, Rui Yan, Jianzheng Zhang, Wangqing Zhang,
Synthesis of size-controlled Au nanoparticles for aerobic alcohol oxidation within a porous, chelating and intelligent hydrogel of poly(N-isopropylacrylamide)-co-poly[2-methacrylic acid 3-(bis-carboxymethylamino)-2-hydroxypropyl ester] (PNIPAM-co-PMACHE) is studied. The PNIPAM-co-PMACHE hydrogel is demonstrated to be a suitable scaffold, within which Au nanoparticles with size ranging from 2.6 to 6.3 nm are synthesized by reducing the Au precursor of HAuCl4 with different reducing agents. The synthesized ...
Tópico(s): Nanomaterials for catalytic reactions
2009 - Elsevier BV | Journal of Molecular Catalysis A Chemical
Guiyan Liu, Bin Wu, Jianzheng Zhang, Xiaoli Wang, Mingbo Shao, Jianhui Wang,
A pyrene-tagged ruthenium carbene 8 was synthesized and immobilized on single-walled carbon nanotubes (SWNTs) via pi-pi stacking. These pi-pi interactions were greatly affected by the reaction temperature and the solvent polarity, thus, offering a new reversible immobilization model that can be controlled by reaction temperature in polar solvents, such as acetone. SWNTs-supported ruthenium carbene 8 is a robust and recyclable catalyst system. Six to seven cycles were achieved for ring-closing metathesis ...
Tópico(s): Catalytic Cross-Coupling Reactions
2009 - American Chemical Society | Inorganic Chemistry
Lingen Chen, Jianzheng Gong, Fengrui Sun, Chih Wu,
The thermodynamic performance analysis of a magnetohydrodynamic (MHD) power plant is performed in this paper. The analytical expressions for the power output and the efficiency are derived for the MHD plant coupled to variable temperature heat reservoirs at constant gas velocity and constant Mach number conditions. In the analysis, the irreversibilities include the irreversible heat transfer losses in the hot and cold side heat exchangers, the irreversible compression loss in the compressor, the ...
Tópico(s): Heat Transfer and Optimization
2002 - Elsevier BV | Energy Conversion and Management
Lingen Chen, Jianzheng Gong, Fengrui Sun, Chih Wu,
The power output and efficiency expressions for thermoelectric (semiconductor) generators which is composed of multi-elements are derived with considerations of heat transfer irreversibility in the heat exchangers between the generator and the heat reservoirs. Numerical examples are provided. The effects of heat transfer and the number of elements on the performance are analyzed.
Tópico(s): Thermal Radiation and Cooling Technologies
2002 - Elsevier BV | International Journal of Thermal Sciences
Changyu Wang, Feng Yang, Xiangping He, H. Shawn Je, Jianzheng Zhou, Kary Eckermann, David H. Kawamura, Linyin Feng, Liya Shen, Bai Lu,
Glial cell line-derived neurotrophic factor (GDNF) is known for its potent effect on neuronal survival, but its role in the development and function of synapses is not well studied. Using Xenopus nerve-muscle co-cultures, we show that GDNF and its family member neurturin (NRTN) facilitate the development of the neuromuscular junction (NMJ). Long-term application of GDNF significantly increased the total length of neurites in the motoneurons. GDNF also caused an increase in the number and the size of ...
Tópico(s): Neuroscience and Neural Engineering
2002 - Elsevier BV | Journal of Biological Chemistry
Dingbo Lin, Jianzheng Zhou, Peggy S. Zelenka, Dolores J. Takemoto,
To demonstrate the interactions of PKCgamma with caveolin (Cav)-1 and connexin(Cx)43 in lipid rafts and its regulation of gap junctions.N/N1003A lens epithelial cells, bovine primary lens epithelial cells, and stably transfected N/N1003A lens epithelial cells were used. Coimmunoprecipitation and Western blot analysis were used to detect protein expression and their interactions. Cav-1-containing lipid rafts and redistribution of Cav-1, PKCgamma, and Cx43 were analyzed by sucrose gradients and by ...
Tópico(s): Erythrocyte Function and Pathophysiology
2003 - Cadmus Press | Investigative Ophthalmology & Visual Science
Jianzheng Zhou, Robert N. Fariss, Peggy S. Zelenka,
12( S )-Hydroxyeicosatetraenoic acid (12( S )HETE) is a bioactive metabolite of arachidonic acid synthesized by 12-lipoxygenase. The 12-lipoxygenase blocker, baicalein, prevents epidermal growth factor (EGF)-induced activation of protein kinase C (PKC) α and β in lens epithelial cells, whereas supplementation with 12( S )HETE reverses this effect, suggesting that EGF and 12( S )HETE may work together to activate PKC. This study investigates the mechanism of PKCβ activation by EGF and 12( S )HETE. 12( S )HETE ...
Tópico(s): NF-κB Signaling Pathways
2003 - Elsevier BV | Journal of Biological Chemistry
Lianqiao Yang, Jianzheng Hu, Moo Whan Shin,
In this letter, the thermal evaluation of high-power LED packages at pulse conditions was reported. A theoretical calculation model was proposed based on the analogy between the thermal and electrical RC circuits. The thermal performance of LED packages driven by pulse input was calculated using the RC network extracted from transient thermal measurement. The junction temperature fluctuation band decreases with the frequency at certain duty cycles. The saturated average junction temperature rise ...
Tópico(s): Thin-Film Transistor Technologies
2008 - Institute of Electrical and Electronics Engineers | IEEE Electron Device Letters
Lianqiao Yang, Jianzheng Hu, Lan Kim, Moo Whan Shin,
In this paper, we present the thermal, electrical, and optical analyses of light emitting diode (LED) packages with different chip sizes. The LED packages under investigation employed the same configuration of package components, except for the chip sizes. The forward current was found to increase with the chip size at the same forward voltage due to the area increase of current spreading. The luminous flux and optical power were found to increase with the chip size at the same current density. The ...
Tópico(s): Silicon Carbide Semiconductor Technologies
2008 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Device and Materials Reliability
Jianzheng Hu, Lianqiao Yang, Moo Whan Shin,
In this paper, we present the thermal and mechanical analysis of high-power light-emitting diodes (LEDs) with ceramic packages. Transient thermal measurements and thermomechanical simulations were performed to study the thermal and mechanical characteristics of ceramic packages. Thermal resistances from the junction to the ambient were decreased from 79.6 to 46.7degC/W by replacing the plastic mold with a ceramic mold for LED packages. Thermomechanical stress induced in the heat-block test was simulated ...
Tópico(s): Thin-Film Transistor Technologies
2008 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Device and Materials Reliability
Jianzheng Zhang, Wangqing Zhang, Yao Wang, Minchao Zhang,
Abstract The pH‐responsive core‐shell microspheres of poly(styrene‐ co ‐methylacrylic acid) (PS‐ co ‐PMAA) containing a polystyrene (PS) core and a poly(methylacrylic acid) (PMAA) shell are synthesized by one‐stage soap‐free copolymerization and the catalyst system palladium‐iminodiacetic acid (IDA‐Pd) is immobilized on the outer shell‐layer of the core‐shell microspheres to form the quasi‐homogeneous and easily accessible catalyst PS‐ co ‐PMAA‐IDA‐Pd. This quasi‐homogeneous PS‐ co ‐PMAA‐IDA‐Pd catalyst ...
Tópico(s): Organoboron and organosilicon chemistry
2008 - Wiley | Advanced Synthesis & Catalysis
Xiayan Wang, Jianzheng Kang, Shili Wang, Joann J. Lu, Shaorong Liu,
We report a unique property of nanocapillaries for chromatographic separations of ionic species. Due to the electric double layer overlap, ions are unevenly distributed inside a nanochannel, with counterions enriched near the wall and co-ions concentrated in the middle of the channel. As a pressure-driven flow is induced, the co-ions will move faster than the counterions. This differential transport results in a chromatographic separation. In this work, we introduce the fundamental mechanism of ...
Tópico(s): Microfluidic and Bio-sensing Technologies
2008 - Elsevier BV | Journal of Chromatography A
Gefu Zhu, Jianzheng Li, Peng Wu, Huizheng Jin, Zheng Wang,
A laboratory-scale anaerobic baffled reactor (ABR) with four compartments using soybean protein processing wastewater as organic loading rates (OLRs) was investigated for the performance and phase separated characteristics. It was found that the chemical oxygen demand (COD) removal efficiencies were 92–97% at 1.2–6.0 kg COD/m3 d feeding. The dominated species, propionate and butyrate, were found in the 1st compartment. Acetate was dominated in the 2nd compartment and then decreased in the 3rd and 4th. ...
Tópico(s): Biofuel production and bioconversion
2008 - Elsevier BV | Bioresource Technology
Jianzheng Zuo, Xiaomin Deng, Michael A. Sutton, Chin-Shan Cheng,
Crack tunneling is a crack growth feature often seen in stable tearing crack growth tests on specimens made of ductile materials and containing through-thickness cracks with initially straight crack fronts. As a specimen is loaded monotonically, the midsection of the crack front will advance first, which will be followed by crack growth along the rest of the crack front, leading to the formation of a thumbnail shaped crack-front profile. From the viewpoint of fracture mechanics, crack tunneling ...
Tópico(s): Mechanical stress and fatigue analysis
2008 - ASM International | Journal of Pressure Vessel Technology
Fei Wen, Wangqing Zhang, Guanwei Wei, Yao Wang, Jianzheng Zhang, Minchao Zhang, Linqi Shi,
The noble metal nanoparticles of Pd, Au, and Ag embedded in the shell layer of core−shell poly(styrene-co-4-vinylpyridine) micospheres were synthesized, and the catalytic activity of the shell-embedded Pd nanoparticles was investigated. To increase the accessible active site and therefore increase the catalytic activity of noble metal nanoparticles, the in situ synthesized noble metal nanoparticles are selectively immobilized in the outer shell layer of the core−shell poly(styrene-co-4-vinylpyridine) ...
Tópico(s): Nanocluster Synthesis and Applications
2008 - American Chemical Society | Chemistry of Materials
Jianzheng Hu, Lianqiao Yang, Moo Whan Shin,
The degradation of high power GaN/InGaN blue light-emitting diodes (LEDs) was investigated by considering the electrical, optical and thermal ageing characteristics. The LED samples were stressed at the elevated temperature of 85 °C with an injection current of 350 mA. Changes in the tunnelling current and series resistance for the electrical characteristics and an initial increase followed by a gradual decrease for the optical power were observed. Variations of the thermal resistance in the chip ...
Tópico(s): Semiconductor Quantum Structures and Devices
2008 - Institute of Physics | Journal of Physics D Applied Physics
Jing Xiao, Ying Zhang, Jianzheng Wang, Weiting Yu, Wei Wang, Xiaojun Ma,
Tópico(s): Graphene and Nanomaterials Applications
2010 - Springer Science+Business Media | Applied Biochemistry and Biotechnology
Wenzhuo Shen, Shumin Han, Yuan Li, Jianzheng Song, Qi Tong,
A new polyaniline (PANI)-coated technique was adopted for a AB5-type alloy (La0.64Ce0.25Pr0.03Nd0.08Ni4.19Mn0.31Co0.42Al0.23) in order to improve its electrochemical and kinetic properties. FE-SEM observation and FT-IR analysis results revealed that the PANI electroless deposited to the surface of alloy particles. Through the PANI-coating the initial discharge capacity increased from 299 to 331 mAh/g and the high rate discharge ability (HRD) increased from 8.5 to 45.0% at discharge current density ...
Tópico(s): Supercapacitor Materials and Fabrication
2010 - Elsevier BV | Electrochimica Acta
Longhai Zhu, Jianzheng Wu, Yongchen Xu, Rijun Hu, Nan Wang,
Tópico(s): Geological and Geophysical Studies
2010 - Springer Nature | Journal of Geographical Sciences
Sheng Chang, Jianzheng Li, Feng Liu,
Tópico(s): Microbial Fuel Cells and Bioremediation
2010 - Springer Nature | Frontiers of Environmental Science & Engineering in China
Jianzheng Zheng, Oscar A. Bizzozero,
We have recently shown that several carbonylated proteins, including glial fibrillary acidic protein, β-actin and β-tubulin, accumulate within cerebellar astrocytes during the chronic phase of myelin-oligodendrocyte glycoprotein (MOG)(35-55) peptide-induced experimental autoimmune encephalomyelitis (EAE) in C57BL/6 mice. As protein carbonyls cannot be repaired and there is less oxidative stress in chronic than in acute EAE, we hypothesized that the accumulation of carbonylated proteins in these animals ...
Tópico(s): Advanced Glycation End Products research
2010 - Wiley | Journal of Neurochemistry
Xiaobo Huang, Jianzheng Wang, Hongguo Xie, Ying Zhang, Wei Wang, Weiting Yu, Yang Liu, Xiaojun Ma,
Aggregating into multicellular spheroids within alginate–poly-L-lysine–alginate (APA) microcapsules is important in maintaining the cellular viability and specific functions. However, in the absence of a vascular network, cells in the core of large-sized spheroids are gradually necrotic because of oxygen transfer limitations. In this study, a novel APA microcapsule embedded with three-dimensional fibrous scaffolds (called APA-FS) was proposed to eliminate cellular necrosis by regulating cells to form ...
Tópico(s): Graphene and Nanomaterials Applications
2010 - Mary Ann Liebert, Inc. | Tissue Engineering Part C Methods
Haijun Su, Jun Zhang, Jianzheng Yu, Lin Liu, Hengzhi Fu,
Directionally solidified oxide ceramic eutectic in situ composites are promising candidate materials for high-temperature structural applications in oxidizing environments. The rapid solidification characteristics of ternary metastable eutectic composition of Al2O3/YAG/YSZ in situ composite ceramics grown by laser zone-remelting technique are investigated. The fracture toughness and crack propagation behavior of the as-solidified composites are examined by the Vickers indentation technique. The ...
Tópico(s): Advanced materials and composites
2010 - Elsevier BV | Materials Science and Engineering A