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Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO_2 ejector system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第2期12卷 146-153页

作者： Xiao-xiao XU Guang-ming chen li-ming TANG Zhi-jiang ZHU Shuang liU Institute of Refrigeration and Cryogenics State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

This study presents experimental results focused on a performance comparison of a transcritical CO2 ejector system without an internal heat exchanger(IHX) (EJE-S) to a transcritical CO2 ejector system with an IHX(EJE-IHX-S) . The comparison includes the effects of changes in operating conditions such as cooling water flow rate and inlet temperature. Experiments are conducted to assess the influence of the IHX on the heating coefficient of performance(COPr) ,heating capacity,entrainment ratio,pressure lift,and other parameters. The primary flow rate of the EJE-IHX-S is higher than that of the EJE-S. The pressure lift and actual ejector work recovery are reduced when the IHX is added to the transcritical CO2 ejector system. Using a more practical performance calculation,the compression ratio in the EJE-S is reduced by 10.0%-12.1%,while that of EJE-IHX-S is reduced only by 5.6%-6.7% compared to that of a conventional transcritical CO2 system. Experimental results are used to validate the findings that the IHX weakens the contribution of the ejector to the system performance.

关键词： CO2 ejector system Transcritical cycle Heating coefficient of performance (COPr)

Supported carbon dots decorated with metallothionein for selective cadmium adsorption and removal

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Chinese Chemical Letters 2015年第12期26卷 1496-1501页

作者： Ting Yang Yi-Kun li ming-li chen Jian-Hua Wang Research Center for Analytical Sciences College of Sciences Northeastern University

Carbon dots are prepared and immobilized onto spherical SiO_2 through a one-step thermal oxidation and then decorated with metallothionein（MT）, a protein with high affinity towards thiophilic metals. The MT-carbon dots composites are characterized by means of FT-IR, SEM and TGA, giving rise to a MT loading amount of 823 μg g^（-1）. The adsorption of cadmium by the composites is a fast process and follows Langmuir model. In comparison with native SiO_2, a 2- and 2.4-folds improvement on the static and dynamic adsorption capacity of the composites for cadmium are obtained, respectively. Moreover,the adsorption efficiency is not affected by the presence of other metals. Finally, the composites are successfully applied for the removal of cadmium in a series of environmental water samples.

关键词： cadmium adsorbent spherical kinetics isotherms sorption breakthrough effluent alkaline sequential

Energy dissipation and contour integral characterizing fracture behavior of incremental plasticity

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Acta Mechanica Sinica 2011年第2期27卷 251-258页

作者： Qi-lin He lin-Zhi Wu ming li Hong-Bo chen chen Center for Composite Materials Harbin Institute of Technology 150080 Harbin China

J ep -integral is derived for characterizing the frac- ture behavior of elastic-plastic materials. The J ep -integral differs from Rice’s J-integral in that the free energy density rather than the stress working density is employed to define energy-momentum tensor. The J ep -integral is proved to be path-dependent regardless of incremental plasticity and deformation plasticity. The J epintegral possesses clearly clear physical meaning：（1） the value J ep tip evaluated on the infinitely small contour surrounding the crack tip represents the crack tip energy dissipation; （2） when the global steadystate crack growth condition is approached, the value of J ep farss calculated along the boundary contour equals to the sum of crack tip dissipation and bulk dissipation of plastic zone. The theoretical results are verified by simulating mode I crack problems.

关键词： J-integral · Energy dissipation · Proportional loading · Deformation plasticity · Incremental plasticity

Isolation of hemoglobin with metal–organic frameworks Y(BTC)(H_2O)_6

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Chinese Chemical Letters 2015年第12期26卷 1460-1464页

作者： Yang Shu Ying Meng ming-li chen Jian-Hua Wang Research Center for Analytical Sciences College of SciencesNortheastern University Institute of Biological Technology College of Life and Health Sciences Northeastern University

The hierarchical metal-organic frameworks（MOFs）,such as Y（BTC）（H_2O）_6,are prepared with yttrium nitrate and benzene-1,3,5-tricarboxylic acid at room *** product is characterized by Fourier transform infrared（FT-IR）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）and thermogravimetric analysis（TGA）.The Y（BTC）（H_2O）_6 particles are sufficiently rigid for performing solid phase extraction and they exhibit favorable selectivity toward the adsorption of *** adsorption behavior of hemoglobin onto the Y（BTC）（H_2O）_6 fits the Langmuir adsorption model with a theoretical adsorption capacity of 555.6 mg g *** adsorption efficiency of 87.7%for 100μg mL 1hemoglobin in 1 mL sample solution（at pH 6.0）is achieved with 0.40 mg Y（BTC）（H20）6.77.3%of the retained hemoglobin is readily recovered using a 0.5%（m/v）SDS solution as the stripping *** dichroism spectra indicated that the conformation of hemoglobin is maintained during the adsorption-desorption *** MOFs material is applied for the isolation of hemoglobin from human blood and the purity of the obtained hemoglobin is further verified by sodium dodecyl sulfate polyacrylamide gel electrophoresis（SDS-PAGE）.

关键词： hemoglobin BTC H2O hierarchical selectivity nitrate desorption verified dodecyl polyacrylamide

Deposition of crackless freestanding diamond films on Mo substrates with Zr interlayer

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 246-250页

作者： Zheng liu cheng-ming li liang-xian chen li-mei Wang li-fu Hei Fan-xiu Lu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The Mo substrate with Zr interlayer,namely composite substrate,was employed to solve the problem of crack formation in the freestanding diamond film *** diamond films deposited on the composite substrates by the direct current arc plasma jet chemical vapor deposition（CVD） method were investigated with scanning electron microscopy（SEM）,X-ray photoelectron spectroscopy （XPS）,X-ray diffraction（XRD）,and Raman *** addition,the stress distribution during the large area freestanding diamond film deposition on the composite substrate was analyzed based on the finite element model *** results reveal that Zr interlayer can be easily destroyed during the post-deposition cooling process,which is helpful for stress release and crack avoiding in diamond films.

关键词： chemical vapor deposition diamond film interlayer thermal stress finite element analysis

Rational design and structural regulation of near-infrared silver chalcogenide quantum dots

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Nano Research 2024年第12期17卷 10585-10606页

作者： Zhen-Ya liu Wei Zhao li-ming chen Yan-Yan chen Zhi-Gang Wang An-An liu Dai-Wen Pang College of Chemistry School of Medicine and Frontiers Science Center for Cell ResponsesFrontiers Science Centre for New Organic MatterTianjin Key Laboratory of Biosensing and Molecular RecognitionResearch Centre for Analytical SciencesNankai UniversityTianjin 300071China School of Chemical and Environmental Engineering Yancheng Teachers UniversityYancheng 224002China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Silver chalcogenides(Ag_(2)E;E=S,Se,or Te)quantum dots(QDs)have emerged as promising candidates for near-infrared(NIR)***,their narrow bandgap and small exciton Bohr radius render the optical properties of Ag_(2)E QDs highly sensitive to surface and size ***,the propensity for the formation of silver impurities and their low solubility product constants pose challenges in their controllable *** advancements have deepened our understanding of the relationship between the multi-hierarchical structure of Ag_(2)E QDs and their optical *** rational design and precise structural regulation,the performance of Ag_(2)E QDs has been significantly enhanced across various *** review provides a comprehensive overview of historical and current progress in the synthesis and structural regulation of Ag_(2)E QDs,encompassing aspects such as size control,crystal structure engineering,and surface/interface ***,it discusses outstanding challenges and potential opportunities in this *** aim of this review is to promote the custom synthesis of Ag_(2)E QDs for applications in biological imaging,and optoelectronics applications.

关键词： silver chalcogenides structural regulation size control crystal engineering surface and interface regulation

Isolation and Characterization of GmSTY1,a Novel Gene Encoding a Dual-Specificity Protein Kinase in Soybean（ Glycme max L.）

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Journal of Integrative Plant Biology 2006年第7期48卷 857-866页

作者： Zhao-Shi Xu You-Zhi Ma Xian-Guo cheng li-Xia Cao lian-cheng li ming chen Key Laboratory of Crop Genetics and Breeding Ministry of Agriculture Institute of Crop Science the Chinese Academy of Agricultural Sciences Beijing 100081 China

Phosphorylation of protein klnases has profound effects on their activity and interaction with other proteins. Tyroslne phosphorylation was reported to be involved in various physiological processes in plants; however, no typical receptor tyrosine kinase has been isolated from plants thus far. Dual-specificity kinases are potentially responsible for the phosphorylation of both tyrosine and serine/threonine of target proteins. A cDNA clone encoding a putative dual-specificity protein kinase was isolated by screening the cDNA GAL4 activation domain （AD） fusion library of soybean （Glycine max L.）, and its entire length was obtained using 5＇-rapid ampUflcatlon of cDNA ends. The predicted polypeptide of 330 amino acid residues, designated as GmSTY1, contains all 11 conserved subdomains, which share common characteristics with both the serine/ threonine and tyroslne protein klnases reported thus far. In addition, three potential N-linked glycosylation sites （NXS/T）, as well as phosphorylation motifs （SXXXS/T）, were observed, suggesting that GmSTY1 may be post-translationally modified. Furthermore, a potential N-myristoylation motif （MGARCSK） was found, suggesting that the GmSTY1 protein could associate with membranes in vivo. Southern blotting analysis revealed a single-copy of GmSTY1 in the genome. Northern blotting analysis showed that this gene was upregulated by drought and salt treatment in a time-dependent manner; however, exogenous abscisic acid （ABA） could not significantly affect the mRNA accumulation of GmSTY1. Interestingly, the transcript of this gene was remarkably downregulated by cold treatment during the early stages of the response, but upregulated later. These results Indicate that the protein kinase was possibly regulated by abiotic stresses in an ABA-independent pathway.

关键词： abiotic stress dual-specificity Glycine max , serine/threonine/tyrosine protein kinase.

Production and Properties of a Thickener with Ability of Suspending Sand

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Journal of China University of Mining and Technology 2006年第2期16卷 115-118,122页

作者： QIN Bo-tao WANG De-ming li Zeng-hua chen jian-hua School of Mineral and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

To overcome the shortcomings of pouring sands, a thickener with the ability to suspend sands was developed. It is mixed with sands to form densified slurry, and can insure the sands against deposition, jamming pipelines and de- hydration. The chemical structure of the thickener is introduced in this paper and the production process is studied. The main processes include immersion, decomposition, dilution and addition of additives. In order to produce a thickener with high viscosity to suspend sands, key factors must be controlled in each process: the immersion time is 2 h; the mass fraction of formaldehyde is 0.01% and mass of NaCO3 accounts for 15% of dry material; the water temperature is 65 ℃ in summer and 72 ℃ in winter and the decomposition time is 2 h in the reaction; the densified decomposition so- lution should be diluted to 1% mass fraction; the additives of calcium ions and pH indicators must be added to the di- luted liquid; the mass fraction of CaCl2 is 0.048% and the pH value of the solution is 7.5. The thickener is a gel with three-dimensional network structure, a liquid with non-Newtonian behaviour and the characteristics of pseudo-plastic material, a solution with little resistance and the ability to revive its oral primary viscosity. It has been successfully ap- plied in Shendong Mines and has great value and wide-spread prospective use.

关键词： thickener ability of suspending sand spontaneous combustion of coal

Genome Analysis of the Bombyx mori Infectious Flacherie Virus Isolated in China

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Agricultural Sciences in China 2010年第2期9卷 299-305页

作者： li ming-qian chen Xiao-xue WU Xiao-xia MAN Na-na JIN Wei LU Xing-meng Laboratory of Invertebrate Pathology College of Animal Sciences Zhejiang University Hangzhou 310029 P.R.China

We reported here the complete genome of the Bombyx mori infectious flacherie virus （BmlFV）, BmlFV-CHN01, isolated in China and compared it with the Japanese strain IFV （BmIFV-JAN） sequence. BmIFV-JAN and BmIFV-CHN01 were 99% identical in nucleotide and amino acid sequences. The amino acid sequences of the three structural proteins （VP1, VP3 and VP4） and L protein were 100% identical between the two strains. Phylogenetic analyses based on conserved domains in RNA-dependent RNA polymerases （RdRps） by the neighbor-joining method showed that these two strains were from the same virus. The gain of the whole genome of the BmIFV isolated in China and its weak mutation character established a great foundation to the study of functional genome and the molecular epidemiology of BmIFV.

关键词： Bombyx mori infectious flacherie virus complete genome phylogenetic analysis