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Studies on the Basic Conformation of Lysozyme by Electrospray Ionization-Mass Spectrometry(ESI-MS)

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Chemical Research in Chinese Universities 2001年第4期17卷 368-373页

作者： GU Sheng SHEN Jin-can ZHUANG Zhi-xia WANG xiao-ru Key Laboratory of Analytical Science of Ministry of Education Department of ChemistryXiamen UniversityXiamen 361005P.R.China

In the present work, 2-mercaptoethanol and dithiothreitol were used to hydrogenise the internal disulfide bond in lysozyme. The experimental results indicate that the charge distribution of the proteins are different in the reaction process. From the calculated molecular weight, the reduction process of the disulfide bond in the molecules can be described, and the number of the disulfide bonds in the molecule can also be determined.

关键词： Protein Disulfide Electrospray ionization Mass spectrometry

Optimization of sowing date and seeding rate for high winter wheat yield based on pre-winter plant development and soil water usage in the Loess Plateau,China

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Journal of Integrative Agriculture 2019年第1期18卷 33-42页

作者： REN Ai-xia SUN Min WANG pei-ru XUE Ling-zhu LEI Miao-miao XUE Jian-fu GAO Zhi-qiang YANG Zhen-ping College of Agriculture Shanxi Agricultural University

Sowing date and seeding rate are critical for productivity of winter wheat(Triticum aestivum L.).A three-year field experiment was conducted with three sowing dates(20 September(SD1),1 October(SD2),and 10 October(SD3)) and three seeding rates(SR67.5,SR90,and SR112.5) to determine suitable sowing date and seeding rate for high wheat yield.A large seasonal variation in accumulated temperature from sowing to winter dormancy was observed among three growing *** sowing dates for strong seedlings before winter varied with the seasons,that was SD2 in 2012–2013,SD3 in 2013–2014,and SD2 as well as SD1 in 2014–*** variation in precipitation during summer fallow also had substantial effects on soil water storage,and consequently influenced grain yield through soil water consumption from winter dormancy to maturity *** consumption of soil water from winter dormancy to booting stages could make more water available for productive growth from anthesis to maturity stages,leading to higher grain ***2 combined with SR90 had the lowest soil water consumption from winter dormancy to booting stages in 2012–2013 and 2014–2015; while in 2013–2014,it was close to that with SR67.5 or *** productive growth from anthesis to maturity stages,SD2 with SR90 had the highest soil water consumption in all three *** highest water consumption in the productive growth period resulted in the best grain yield in both low and high rainfall *** number largely contributed to the seasonal variation in grain yield,while grain number per ear and 1 000-grain weight also contributed to grain yield,especially when soil water storage was *** results indicate that sowing date and seeding rate affect grain yield through seedling development before winter and also affect soil water consumption in different growth *** selecting the suitable sowing date(1 October) in combination with the proper seeding rate of 90 kg ha–1,the best yield was achieved

关键词： accumulated temperature dry-land sowing date seeding rate soil water winter wheat yield components

Layout dependence of total-ionizing-dose response in 65-nm bulk Si pMOSFET

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Science China(Information Sciences) 2021年第2期64卷 271-272页

作者： Zhexuan REN xia AN Gensong LI Xing ZHANG ru HUANG Key Laboratory of Microelectronic Devices and Circuits Institute of MicroelectronicsPeking University

Dear editor,Strain technology has become a common solution in the semiconductor manufacturing industry since 90-nm technology node to overcome the severe carrier mobility degradation of nanoscale microelectronic devices [1]. Since layout may affect the stress distribution, layout dependent effect(LDE)becomes a serious issue in advanced technology nodes.

关键词： Information Systems and Communication Service

Laser welding process and strength enhancement of carbon fiber reinforced thermoplastic composites and metals dissimilar joint:A review

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Chinese Journal of Aeronautics 2023年第12期36卷 13-31页

作者： Junke JIAO Jihao XU Chenghu JING Liyuan SHENG Haolei ru Hongbo xia School of Mechanical Engineering Yangzhou UniversityYangzhou 225009China PKU-HKUST ShenZhen-HongKong Institution Shenzhen 518057China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Carbon fiber reinforced thermoplastic composites(CFRTP)and metals hybrid structures have been widely used in aircraft lightweight ***,due to the significant difference in physical and chemical properties between CFRTP and metals,there are lots of challenges to connect them with high *** welding has a good application prospect in CFRTP and metals connection,and a significant research progress has been made in the exploration of CFRTP-metal laser joining mechanism,joining process optimization,joining strength improvement and joining defects ***,there are still some problems need to be solved for this technology *** this paper,the research progress of CFRTP-metal laser joining was summarized in three major aspects:theoretical modeling and simulation analysis,process exploration and parameter optimization,joint performance improvement and process ***,problems and challenges of this technology were discussed,and the outlook of this research was provided.

关键词： Carbon fiber reinforced thermoplastic composite and metal hybrid joints Defects controlling Laser welding Numerical simulation

Synthesis and Crystal Structure of N-Phenylbis(ferrocenecarboxyl)imide

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Chinese Journal of Structural Chemistry 2007年第3期26卷 291-294页

作者： ZHAO Feng LI Ganga WU Jing-xia ZHANG Zong-pei Department of Chemistry Zhengzhou University Henan 450052 China Office of Research Administration Zhengzhou University Henan 450052 China

The ferrocenyl compound, N-phenylbis（ferrocenecarboxyl）imide （C28H23NO2Fe2, Mr = 517.17）, was synthesized and structurally characterized by means of X-ray single-crystal diffraction. It crystallizes in monoclinic, space group C2/c with a = 21.374（14）, b = 10.430（7）, c = 10.741（7） A, β= 114.184（8）°, V= 2184（2） A^3, Z= 4, Dc = 1.573 g/cm^3, F（000） = 1064, μ（MoKα） = 1.355 mm ^-1, T= 291（2） K, the final R = 0.0548 and wR = 0.1437 for 1524 observed reflections with 1 〉 2σ（I）. In this compound, the nitrogen atom links two ferrocenyl groups and one phenyl group forming a novel imido derivative.

关键词： N-phenylbis(ferrocenecarboxyl)imide synthesis crystal structure

Response of benthic algae to environmental conditions in an urban lake recovered from eutrophication, China

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Journal of Oceanology and Limnology 2020年第1期38卷 93-101页

作者： WANG Tao WANG Qing xia Shuang YAN Chunlan pei Guofeng Hubei Provincial Key Laboratory for Protection and Application of Special Plant Germplasm in Wuling Area of China SouthCentral University for Nationalities

Benthic algae communities dominate the primary production in littoral zone of shallow *** tmderstand the long-term effect of alteration in the composition of benthic algae community assemblage in such as a lake in China,we analyzed the benthic algae developments and indicators in the Donghu Lake in Wuhan,central China in 2004 and *** compared the benthic algae biomass,compositions,and species richness of aquatic macrophytes and the changes of primary physicochemical *** results show that in the 10-year period,chl a and conductivity declined significantly but nutrient level of the whole lake remained largely *** benthic algae biomass doubled and the relative proportion of green algae increased,whereas the benthic diatom ratio *** benthic diatom assemblages and taxa differed in a number of ways,showing more epiphytic diatom species,and the relative abundance and species richness changed *** number of aquatic macrophyte species increased from 3 in 2004 to 15 in 2014,presenting a remarkable recovery from previous eutrophication *** changes of water level,chl a,and conductivity played a crucial role in governing aquatic macrophytes re-colonization in the littoral zones in the *** ecological characteristics of littoral benthic diatoms reflect habitat coupling as indicated by redundancy ***,the close link between benthic algae and macrophyte recovery demonstrates that the benthic algae metrics are much more useful than nutrient levels to quantify the process of restoration in the lake.

关键词： benthic algae benthic diatom lake restoration aquatic macrophyte water level

MMSE channel estimation for two-port demodulation reference signals in new radio

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Science China(Information Sciences) 2021年第6期64卷 247-248页

作者： Dejin KONG xiang-Gen xia pei LIU Qibiao ZHU School of Electronic and Electrical Engineering Wuhan Textile University Department of Electrical and Computer Engineering University of Delaware School of Information Engineering Wuhan University of Technology School of Information Engineering Nanchang University

Dear editor,Orthogonal frequency division multiplexing(OFDM) has been adopted in new radio(NR) [1], and multiple-port demodulation reference signal(DMRS) has been designed to achieve channel estimation. In NR, two ports of DMRS share the same frequency resource elements(RE) by employing an orthogonal code comprising cyclic shift phase. In general, channel estimation can be achieved via the classical discrete Fourier transform(DFT) scheme [2, 3] as channels for the two ports of DMRS can be separated in the time domain via the DFT scheme.

关键词： MMSE channel estimation for two-port demodulation reference signals in new radio

Cryptanalysis and improvement of several quantum private comparison protocols

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Communications in Theoretical Physics 2020年第8期72卷 57-62页

作者： Zhao-Xu Ji pei-ru Fan Huan-Guo Zhang Hou-Zhen Wang Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China

Recently, Wu et al(2019 Int. J. Theor. Phys. 58 1854) found a serious information leakage problem in Ye and Ji’s quantum private comparison protocol(2017 Int. J. Theor. Phys. 561517), that is, a malicious participant can steal another’s secret data without being detected through an active attack means. In this paper, we show that Wu et al’s active attack is also effective for several other existing protocols, including the ones proposed by Ji et al and Zha et al(2016 Commun. Theor. Phys. 65 711;2018 Int. J. Theor. Phys. 57 3874). In addition,we propose what a passive attack means, which is different from Wu et al’s active attack in that the malicious participant can easily steal another’s secret data only by using his own secret data after finishing the protocol, instead of stealing the data by forging identities when executing the protocol. Furthermore, we find that several other existing quantum private comparison protocols also have such an information leakage problem. In response to the problem, we propose a simple solution, which is more efficient than the ones proposed by Wu et al, because it does not consume additional classical and quantum resources.

关键词： quantum information security quantum cryptography quantum private comparison information leakage problem passive attack

Fabrication of high-performance pervaporation composite membrane for alkaline wastewater reclamation

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 709-719页

作者： Guiqin Bai Jianzhong xia Bing Cao rui Zhang Junquan Meng pei Li College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Institute for Advance Study Shenzhen UniversityShenzhen 518060China

Pervaporation desalination has a unique advantage to recycle concentrated salt *** merit can be applied to treat alkaline wastewater if the membrane has superior *** this paper,we used polyethylene microfiltration membrane as the substrate and deposited a glutaraldehyde crosslinked sodium carboxymethylcellulose layer by *** flux of the composite membrane reached 352 kg·m^(-2)·h^(-1) with a sodium chloride rejection of 99.9%0.1%when separating a 3.5 wt-%sodium chloride solution at 70℃.The desalination performance was stable after soaking the membrane in a 20 wt-%NaOH solution at room temperature for 9 d and in a 10 wt-%NaOH solution at 60℃ for 80 ***,the membrane was stable in 4 wt-%sulfuric acid and a 500 mg·L^(-1) sodium hypochlorite *** a process of concentrating a NaOH solution from 5 to 10 wt-%at 60℃,an average water flux of 23 kg·m^(-2)·h^(-1) with a NaOH rejection over 99.98%was obtained.

关键词： pervaporation alkaline solution concentration polyethylene membrane acid resistance chlorine tolerance