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Effects of supply air temperature and inlet location on particle dispersion in displacement ventilation rooms

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Particuology 2011年第6期9卷 619-625页

作者： yanming Kang Youjun wang Ke Zhong School of Environmental Science and Engineering Donghua University Shanghai 201620 China

The effects of supply temperature and vertical location of inlet air on particle dispersion in a displacement ventilated （DV） room were numerically modeled with validation by experimental data from the literature. The results indicate that the temperature and vertical location of inlet supply air did not greatly affect the air distribution in the upper parts of a DV room, but could significantly influence the airflow pattern in the lower parts of the room, thus affecting the indoor air quality with contaminant sources located at the lower level, such as particles from working activities in an office. The numerical results also show that the inlet location would slightly influence the relative ventilation efficiency for the same air supply volume, but particle concentration in the breathing zone would be slightly lower with a low horizontal wall slot than a rectangular diffuser. Comparison of the results for two different supply temperatures in a DV room shows that, although lower supply temperature means less incoming air volume, since the indoor flow is mainly driven by buoyancy, lower supply temperature air could more efficiently remove passive sources （such as particles released from work activities in an office）. However, in the breathing zone it gives higher concentration as compared to higher supply air temperature. To obtain good indoor air quality, low supply air temperature should be avoided because concentration in the breathing zone has a stronger and more direct impact on human health.

关键词： Displacement ventilation Particle dispersion Numerical simulation Supply air temperature Inlet location

Numerical Simulation of High-Power Synthetic Jet Actuator Flowfield and its Influence on Mixing Control

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Journal of Thermal Science 2008年第3期17卷 207-211页

作者： yanming LIU Baoguo wang Shuyan LIU School of Aerospace Science and Engineering Beijing Institute of Technology Beijing 100081 China

Detailed two-dimensional unsteady numerical simulation is carried out to investigate a high-power synthetic jet actuator flow field and its design characteristic. Simultaneously, mixing control mechanism of coaxial jets with actuators is also studied. Firstly, excitation frequency （rotating speed）, piston displacement and its exit slot width have effect on the controlling ability and controlling efficiency of actuator. With the invariable model and con- cerned parameters, the actuator becomes more desirable as the rotating speed increases. Average velocity and maximal velocity at the actuator exit section increase as the piston displacement enlarges or the exit slot width decreases. But the actuator does not always exhibit good performance with the narrower exit. Secondly, the synthetic jets also have the ＂push＂ effect on the coaxial jets, which results in the fluctuation of vorticity and temperature distribution of mixing flowfield. Finally, the employment of synthetic jet actuator can achieve mixing enhancement significantly.

关键词： High-power synthetic jet actuator Mixing control Exit velocity Mixing enhancement

s-Permutably embedded subgroups and p-supersolvable groups

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Science China Mathematics 2014年第4期57卷 729-736页

作者： QIAO ShouHong wang yanming School of Applied Mathematics Guangdong University of Technology Lingnan College and Department of Mathematics Sun Yat-sen University

Let G be a finite group,and H a subgroup of G.H is called s-permutably embedded in G if each Sylow subgroup of H is a Sylow subgroup of some s-permutable subgroup of *** this paper,we use s-permutably embedding property of subgroups to characterize the p-supersolvability of finite groups,and obtain some interesting results which improve some recent results.

关键词： finite groups s-permutably embedded subgroups p-supersolvable groups

Synthesis of reversible PAD4 inhibitors via copper-catalyzed C-H arylation of benzimidazole

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Science China Chemistry 2019年第5期62卷 592-596页

作者： Zhengwei Guo Lai Shi Bo wang Gang He yanming wang Gong Chen State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai University School of Life Sciences Henan University Department of Biochemistry and Molecular Biology The Pennsylvania State University

PAD4 is a promising epigenetic drug target for various cancers and immune diseases. In this work, we applied a Cu-catalyzed C–H arylation reaction of N-heteroarene to the synthesis of complex non-covalent PAD4 inhibitors bearing a bi-heteroaryl pharmacophore. This strategy allowed us to access various analogs of C_2-aryl substituted benzimidazoles from a common benzimidazole core and easily accessible aryl iodides. Preliminary SAR studies revealed the indole motif of GSK-484 is critical to its activity. Replacing the N-cyclopropylmethyl group to N-benzyl group on the indole ring of GSK-484 resulted in more than5-fold increase in cell killing efficacy against 4T1 cell line.

关键词： C–H arylation benzimidazoles PAD4 inhibitor copper catalysis

Rumen-protected lysine supplementation improved amino acid balance,nitrogen utilization and altered hindgut microbiota of dairy cows

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Animal Nutrition 2023年第4期15卷 320-331页

作者： Xiaoshi Wei Hao Wu Zixiang wang Jinpeng Zhu Weijie wang Junhong wang yanming wang Chong wang College of Animal Science and Technology&College of Veterinary Medicine Zhejiang A&F UniversityHangzhouZhejiang 311300China College of Animal Science Zhejiang UniversityHangzhou 310058China Kemin(China)Technologies Co.Ltd. Zhuhai 519040China

This study was conducted to evaluate the effects of dietary crude protein(CP)and rumen-protected lysine(RPL)supplementation on lactation performance,amino acid(AA)balance,nitrogen(N)utilization and hindgut microbiota in dairy *** were in a 2×2 factorial arrangement,and the main effects were CP concentration(16%vs.18%)and RPL supplementation(with or without RPL at40 g/cow per day).Forty cows were randomly allocated to 4 groups:low-CP diet(LP),low-CP diet plus RPL(LPL),high-CP diet(HP),high-CP diet plus RPL(HPL).The experiment was conducted for 8 *** showed that RPL increased the dry matter intake(P<0.01),milk protein yield(P=0.04)and energy corrected milk(P=0.04),and tended to increase milk fat yield(P=0.06)and fat corrected milk(P=0.05).Cows in the HP group tended to have higher milk urea N(P=0.07).Plasma concentrations of Arg,Ile,Lys,Met,Pro,total essential AA and total nonessential AA were increased by RPL(P<0.05).The total essential AA,total nonessential AA and most AA(except Ile,Phe,Gly and Pro)were increased in the HP group(P<0.05).N excretion was increased in the HP group through an increase in urea N excretion(P<0.01)and an upward trend in plasma urea N(P=0.07).In addition,RPL tended to increase milk protein N secretion(P=0.08),milk N(P=0.07)and microbial protein synthesis(P=0.06),and decreased plasma urea N(P<0.001).In the hindgut,the bacterial community were different between the LP and LPL groups(P<0.01).The probiotic abundances of Christensenellaceae_R-7_group and Acinetobacter were increased by RPL(P=0.03 and 0.03,respectively).The pathogenic abundances of Clostridium_sensu_stricto_1(P<0.001)and Turicibacter(P<0.01)were decreased by *** conclusion,supplementing RPL with low dietary CP could balance AA supply and increase milk protein yield,resulting in an improvement in N utilization efficiency,and altered the composition of the hindgut microbiota to favor the lactation performance of dairy cows.

关键词： Rumen-protected lysine Milk protein N utilization Hindgut microbiota Dairy cow

Fluorescence study on the interactions of PAMAM dendrimers and their derivatives with bovine serum albumin

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Chinese Science Bulletin 2005年第21期50卷 2436-2441页

作者： wang yanming SONG Yu KONG Deling YU Yaoting Bioactive Material Research Laboratory Nankai University Tianjin 300071 China

The interactions of amino-terminated, and ethylenediamine core poly(amidoamine) (PAMAM) den-drimers and their derivatives with bovine serum albumin (BSA) were investigated by fluorescence spectroscopy. Ex-perimental results showed that the fluorescence intensity of BSA decreased after the addition of different modified den-drimers, and the extent of the fluorescence quenching caused by various modified dendrimers strongly depends upon the different functional groups on their surfaces. We also inves-tigated the influence of pH and ionic strength on the interac-tion between various modified dendrimers and BSA. Circu-lar dichroism (CD) spectroscopic measurements showed that the content of α-helix structure of BSA decreased after the addition of different modified dendrimers, which indicated that dendrimers induced changes in the secondary structure of BSA.

关键词： PAMAM 高分子化合物化学结构荧光性分色性

Electrical control of excitonic oscillator strength and spatial distribution in a monolayer semiconductor

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Nano Research 2024年第9期17卷 8424-8430页

作者： yanming wang Junrong Zhang Tianhua Ren Meng Xia Long Fang Xiangyi wang Xingwang Zhang Kai Zhang Junyong wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacao 999078China College of New Energy Inner Mongolia University of TechnologyHohhot 010051China

Electrical modulation of luminescence is significant to modern light-emitting *** transition metal dichalcogenides are emerging direct-bandgap luminescent materials with unique excitonic properties,and the multiple exciton complexes provide new opportunities to modulate the property of luminescence in atomically thin ***,we report an electrical control of exciton emission in the oscillator strength and spatial distribution of excitons in a monolayer *** modulation of excitonic emission intensity with a degree of modulation of~92%has been demonstrated by an electric field at room *** spatial carrier redistribution tuned by a lateral electric field results in distinct excitonic emission patterns by *** modulation approach to exciton oscillator strength and distribution provides an efficient way to investigate the exciton diffusion dynamics and to construct electrically tunable optoelectronic devices.

关键词： monolayer semiconductor exciton electrical modulation spatial distribution

LDL adsorbent with dendrimer PAMAM as spacer

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Frontiers of Chemical Science and Engineering 2008年第4期2卷 434-438页

作者： Yi YUAN yanming wang Yaoting YU Department of Biochemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China The Key Laboratory of Bioactive Materials Ministry of EducationNankai UniversityTianjin 300071China

Dendritic polymers are three-dimensional,highly ordered compounds formed by reiterative reaction sequences,and via discrete stages referred to as *** study the spacer effect of low density lipoprotein(LDL)adsorbent,we linked dendrimer polyamidoamine(PAMAM)generation 1(G1),generation 3(G3)and gen-eration 5(G5)to cellulose beads,respectively,and then determined the adsorption proportion of the adsorbents with PAMAM decorated with *** result shows that the spacer with activated multi-points could effi-ciently improve the adsorption capacity of the adsorbent.

关键词： low density lipoprotein(LDL) adsorbent spacer dendrimer PAMAM

Interaction between poly(amidoamine) dendrimers and DNA studied by spectroscopic methods

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Chinese Science Bulletin 2005年第19期50卷 2161-2165页

作者： wang yanming SONG Yu KONG Deling YU Yaoting Bioactive Material Research Laboratory Nankai University Tianjin300071 China

The interaction between amino-terminated, and ethylenediamine core poly(amidoamine) (PAMAM) den-drimers and herring sperm DNA was investigated by various spectroscopic methods including UV spectroscopy, fluores-cence spectroscopy, microscopic FTIR- and circular dichro-ism (CD-) spectroscopy. Ethidium bromide (EB) is used as a nucleic acid probe for this study. Experimental results show that PAMAM dendrimers can form stable complexes with DNA and the dendrimers bind to DNA sufficiently strong which cannot be displaced by EB, and we also found that the formation of the complexes can cause the conformation change of the DNA secondary structure. According to the Scatchard analysis, the association constant of PAMAM to DNA is calculated to be 2.53 × 104 mol/L?1.

关键词：聚乙烯分光镜分子结构 DNA 荧光性