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Synthesis of α-Hydroxy-ω-Aminotelechelic Polypeptide from α-Amino Acid N-Carboxyanhydrides Catalyzed by Alkali-metal Borohydrides

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Chinese Journal of Polymer Science 2014年第6期32卷 743-750页

作者： hui Peng Wan-li Chen Jie Kong Zhi-quan Shen 凌君 moE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Center of Analysis & Measurement Zhejiang University of Technology Shaanxi Key Laboratory of Macromolecular Science and Technology School of Science Northwestern Polytechnical University

It is reported that alkali-metal borohydrides （MBH4, M = Li, Na and K） are efficient catalysts for ring opening polymerization （ROP） of α-amino acid N-carboxyanhydrides （NCAs）. Polypeptides are prepared in quantitative yields with relatively narrow molecular weight distributions （MWDs = 1.1-1.5） which depend on the reaction temperature. End groups of the produced polypeptide are studied in detail by MALDI-ToF MS, IH-NMR, 13C-NMR, IH-1H COSY and IH-13C HMQC analyses. The results indicate that α-hydroxy-ω-aminotelechelic polypeptides are formed which are suitable for post- polymerization functionalization.

关键词： Polypeptide Alkali-metal borohydride α -Amino acid N-carboxyanhydride End group functionalization.

NUMERICAL SIMULATIONS OF VISCOELASTIC FLOWS THROUGH ONE SLOT CHANNEL

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Journal of Hydrodynamics 2007年第2期19卷 210-216页

作者： YIN Hong-jun ZHONG hui-ying FU Chun-quan WANG Lei Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education Daqing Petroleum Institute Daqing 163318 China Oil Recovery Plant No. 1 Daqing Oilfield Corp. Ltd. Daqing 163001 China

In this article, the modified Upper-Convected Maxwell equation （MUCM） is proposed. The viscoelastic polymer solution flow characteristics are described by the numerical method. The stream function contour, velocity contour and stress modulus contour of fluid in slot channel are drawn. The non-Newtonian power law property and viscoelasticity of MUCM fluid influence on the stream function are analyzed. The velocity contour move towards dead oil area with the viscoelasticity increase, flow area increase and the sweep area enlarges, so the sweep efficiency is enhanced.

关键词： viscoelastic fluid modified Upper-ConvectedMaxwell (MUCM) constitutive equation power law exponent,Weissenberg number

Input-output approach to robust stability and stabilization for uncertain singular systems with time-varying discrete and distributed delays

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 546-551页

作者： hui-jiao WANG An-ke XUE Yun-fei GUO Ren-quan LU Institute of Automation Zhej iang Sci- Tech University Hangzhou 310018 China Institute of Information and Control Hangzhou Dianzi University Hangzhou 310018 China

Based on input-output approach, the robust stability and stabilization problems for uncertain singular systems with time-varying delays are investigated. The parameter uncertainties are assumed to be norm-bounded and the time-varying delays include both discrete delay and distributed delay. By introducing a new input-output model, the time-delay system is embedded in a family of systems with a forward system without time delay and a dynamical feedback uncertainty. A sufficient and necessary condition, which guarantees the system regular, impulse-free and stable for all admissible uncertainties, is obtained. Based on the strict linear matrix inequality, the desired robust state feedback controller is also obtained. Finally, a numerical example is provided to demonstrate the application of the proposed method.

关键词： Robust stability Input-output stability Singular system Time-varying delay Linear matrix inequality (LMI)

Effects of Cu(Ⅱ) and humic acid on atrazine photodegradation

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Journal of Environmental Sciences 2011年第5期23卷 773-777页

作者： Xia Sun hui Liu Yaobin Zhang Yazhi Zhao Xie quan Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education Department of Environmental Science and Technology Dalian University of Technology Dalian 116024 China. E-mail: zhangyb@***

This work was designed to explore the characteristics of photodegradation of herbicides in the copper-polluted water body. The results showed that Cu（Ⅱ） alone could induce a photo Fenton-like reaction to enhance the degradation of atrazine, in which hydroxyl radical （.OH） was a main active species. Humic acids restrained atrazine degradation, nevertheless, when introducing Cu（Ⅱ）, the photodegradation was accelerated, in which singlet oxygen （102） replaced -OH acting as the prevailing species. A feasible mechanism for the photochemical process was also proposed, which is helpful for better understanding the environmental photochemistry of atrazine in the copper-polluted water.

关键词： humic acids Cu(Ⅱ) photodegradation hydroxyl radical singlet oxygen

Shape of free-fall arch in quasi-2D silo

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Particuology 2021年第2期19卷 62-69页

作者： Qi Wang quan Chen Ran Li Gang Zheng Ren Han hui Yang School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China

In this study,the optical flow method is used to measure the velocity distribution of a granular flow in a rectangular quasi-two-dimensional *** the velocity gradient,a free-fall arch(FFA)is obtained and its geometric characteristics are calculated.A parabola-shaped FFA structure is discovered above the orifice in the steady flow *** shape of the FFA affects the flow rate through the ***,as jamming begins to occur,the geometry of the FFA disappears gradually from both sides and then from the middle;finally,the FFA disappears completely in the state of *** the boundary between finite-stress and stress-free regions,the FFA facilitates further studies regarding the discontinuity of the stress area above the orifice.

关键词： Granular flow Optical flow method Velocity field Free-fall arch Flow rate Jamming

Origin of singlet self-trapped exciton and enhancement of photoluminescence quantum yield of organic–inorganic hybrid antimony(III)chlorides with the[SbCl_(5)]^(2)−units

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Nano Research 2023年第11期16卷 12680-12688页

作者： Tao Huang Ke Li Jinyu Lei quan Niu hui Peng Bingsuo Zou State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironmental and MaterialsGuangxi UniversityNanning 530004China State Key Laboratory of Luminescent Materials and Devices School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

Sb-based organic–inorganic hybrid metal halides(OIHMHs)with[SbCl5]2−units have been widely reported due to high photoluminescence quantum yield(PLQY)and occasional multiple self-trapped exciton(STE)emission bands mainly out of singlet and triplet states,and their multi-band emission is important in white light-emitting diode(WLED).However,not all these OIHMH compounds can produce both emissions out of singlet STE and triplet STE at room temperature *** is crucial to consider how the singlet STE generates and retains to emit light at room temperature for this material’s design and ***,a strategy is proposed that can significantly lift Sb halide PLQY by synthesizing two Sb-based OIHMHs using organic amine cations of different-sized and-quantity,which modulate the distance of neighboring emission ***,the occurrence of singlet STE emission is found to be closely related to the distance of[SbCl_(5)]^(2)−units and local unit distortion in the *** larger distance can produce smaller local distortions,favoring the formation of the singlet STE emission band at higher *** is the first work to reveal the relationship between the local structure and the origin of the singlet STE emission band,providing new insights into the modulation of the Sb-based OIHMH’s emission.

关键词： antimony halide self-trapped exciton M-Xn cluster separation structure distortion

Detection of hydroxyacetone in protostar IRAS 16293–2422 B

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Research in Astronomy and Astrophysics 2020年第8期20卷 217-229页

作者： Yan Zhou Dong hui quan Xia Zhang Sheng-Li Qin Department of Astronomy Yunnan Universityand Key Laboratory of Astroparticle Physics of Yunnan ProvinceKunming 650091China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Department of Chemistry Eastern Kentucky UniversityRichmondKY 40475USA

Hydroxy acetone(CH3 COCH2 OH)is one of the smallest molecules that contain both hydroxyl and carbonyl group on neighboring carbon *** steric configuration is characteristic of saccharides and determines their biochemical *** attempt to search for hydroxy acetone toward the massive star formation region Sagittarius B2(N)was *** we report the first detection of CH3 COCH2 OH in the solar-type protostar IRAS 16293-2422 B,using the Atacama Large Millimeter Array science verification data at Band *** a total of 11 unblended transitions of CH3 COCH2 OH with upper level energies ranging from 86 to 246 K are *** our local thermodynamic equilibrium analysis,we derived that the rotational temperature of CH3 COCH2 OH is 160±21 K and the column density is(1.2±1.0)×10^16 cm^-2,which results in a fractional abundance of 7×10^-10 with respect to molecular *** this work,we present the identification of CH3 COCH2 OH in IRAS 16293-2422 B and propose a simple formation *** unambiguous identification of hydroxyacetone may provide the basis for future study of the origin and evolution of saccharides in the interstellar medium.

关键词： ISM:abundances ISM:individual(IRAS 16293–2422 B) ISM:molecules

Impact of oxaliplatin and trastuzumab combination therapy on tumor markers and T lymphocyte subsets for advanced gastric cancer

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World Journal of Gastrointestinal Oncology 2024年第9期16卷 3905-3912页

作者： Cheng-Wan Zheng Yun-mo Yang hui Yang Department of Thyroid Surgery The Affiliated Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina

BACKGROUND Advanced gastric cancer(AGC)remains a challenging malignancy with poor *** combination of oxaliplatin and trastuzumab has shown promising results in AGC *** study aimed to investigate the effects of oxaliplatin and trastuzumab combination therapy on serum tumor markers and T lymphocyte subsets in patients with AGC and to explore their potential as predictive biomarkers for treatment *** To investigate the impact of oxaliplatin and trastuzumab combination therapy on serum markers and T cell subsets in patients with *** This prospective study enrolled 60 patients with *** patients received oxaliplatin(130 mg/m^(2),every 3 weeks)and trastuzumab(8 mg/kg loading dose,followed by 6 mg/kg every 3 weeks)for six *** carcinoembryonic antigen(CEA),cancer antigen 19-9(CA19-9),and cancer antigen 72-4(CA72-4)were measured before and after treatment.T-lymphocyte subsets,including CD3+,CD4+,CD8+,and CD4+/CD8+ratios,were also *** clinical response was assessed using the Response Evaluation Criteria in Solid Tumors version *** After six cycles of treatment,the CEA,CA19-9,and CA72-4 serum levels significantly decreased compared to baseline levels(Pmor markers(≥50%reduction)and a higher increase in CD4+/CD8+ratio(≥1.5-fold)showed better clinical response rates(Pmor marker levels and modulated T lymphocyte subsets in patients with *** therapy not only has a direct antitumor effect,but also enhances the immune response in patients with *** tumor markers and T lymphocyte subsets may serve as potential predictive biomarkers for treatment respon

关键词： Advanced gastric cancer Oxaliplatin Trastuzumab Serum tumor markers T lymphocyte subsets Predictive biomarkers

Decarbonization options of the iron and steelmaking industry based on a three-dimensional analysis

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 388-400页

作者： Xin Lu Weijian Tian hui Li Xinjian Li Kui quan Hao Bai Department of Metallurgy Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China China Metallurgical Industry Planning and Research Institute(MPI) Beijing 100711China Carbon Dioxide Research Division CISDI Research&Development Co.Ltd.Chongqing 401122China

Decarbonization is a critical issue for peaking CO_(2) emissions of energy-intensive industries,such as the iron and steel *** decarbonization options of China’s ironmaking and steelmaking sector were discussed based on a systematic three-dimensional low-carbon analysis from the aspects of resource utilization(Y),energy utilization(Q),and energy cleanliness which is evaluated by a process general emission factor(PGEF)on all the related processes,including the current blast furnace(BF)-basic oxygen furnace(BOF)integrated process and the specific sub-processes,as well as the electric arc furnace(EAF)process,typical direct reduction(DR)process,and smelting reduction(SR)*** study indicates that the three-dimensional aspects,particularly the energy structure,should be comprehensively considered to quantitatively evaluate the decarbonization road map based on novel technologies or *** scrap utilization(improvement of Y)and the substitution of carbon-based energy(improvement of PGEF)in particular is *** terms of process scale,promoting the development of the scrap-based EAF or DR-EAF process is highly encouraged because of their lower *** three-dimensional method is expected to extend to other processes or industries,such as the cement production and thermal electricity generation industries.

关键词： peak CO_(2)emission low carbon management decarbonization option energy-intensity industry ironmaking and steelmaking