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Discharge and flow characterizations of the double-side sliding discharge plasma actuator

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Chinese Physics B 2020年第6期29卷 274-285页

作者： qi-Kun he Hua Liang Bo-Rui Zheng Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an 710038China School of Automation and Information Xi’an University of TechnologyXi’an 710048China

We investigate the discharge and flow characterizations of a double-side siding discharge plasma actuator driven by different polarities of direct current(DC)*** discharge tests show that sliding discharge and extended discharge are filamentary *** irregular current pulse of sliding discharge fluctuates obviously in the first half cycle,ultimately expands the discharge *** instantaneous power and average power consumptions of sliding discharge are larger than those of the extended discharge and dielectric barrier discharge(DBD).The flow characteristics measured by a high-frequency particle-image-velocimetry system together with high-speed schlieren technology show that the opposite jet at the bias DC electrode is induced by sliding discharge,which causes a bulge structure in the discharge *** bias DC electrode can deflect the direction of the induced jet,then modifying the properties of the boundary *** discharge can accelerate the velocity of the starting vortex,improving the horizontal velocity profile by 203%.The momentum growth caused by extended discharge has the largest peak value and the fastest growth rate,compared with sliding discharge and ***,the momentum growth of sliding discharge lasts longer in the whole pulsed cycle,indicating that sliding discharge can also inject more momentum.

关键词： plasma double-side sliding discharge induced velocity induced vortex momentum analysis

Low‑Carbon‑Emission Hot Stamping:A Review from the Perspectives of Steel Grade,heating Process,and Part Design

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Automotive Innovation 2023年第3期6卷 324-339页

作者： Zeran Hou Yi Liu qi he Jianfeng Wang Junying Min School of Mechanical Engineering Tongji UniversityShanghai 201804China China Science Lab General Motors Global Research and DevelopmentShanghai 201206China

Hot stamping steels have become a crucial strategy for achieving lightweighting and enhancing crash safety in the automo-tive industry over the past two ***,the carbon emissions of the materials and their related stamping processes have been frequently *** is essential to consider these emissions during the design *** materials and technologies in hot stamping pose challenges to the automotive industry's future development in carbon emission *** review discusses the promising materials for future application and their special features,as well as the emerging manufacturing and part design processes that have extended the limit of application for new *** heating processes and corresponding equipment have been proven to improve heating efficiency and control temperature *** material utilization and the overall performance of the components are improved by tailored blanks and an integrated part design *** achieve low-carbon-emission(LCE)hot stamping,it is necessary to systematically consider the steel grade,heating process,and part design,rather than solely focusing on reducing carbon emissions during the manufacturing process *** review aims to present the latest progress in steel grade,heating process,and part design of hot stamping in the automotive industry,providing solutions for LCE from a holistic perspective.

关键词： Low-carbon-emission Hot stamping Steel grade heating process Part design

Polyharmonic Boundary Value Problem in a Sector

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维普期刊数据库

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Wuhan University Journal of Natural Sciences 2013年第4期18卷 323-326页

作者： WANG Ying he qi he Fuli School of Statistics and Mathematics Zhongnan University of Economics and Law Rackham Graduate School University of Michigan-Ann Arbor School of Mathematics Science and Computing Technology Central South University

In this article, a polyharmonic Neumann function in a sector with angle π n （n N） is studied by convolution. Especially, the outward normal derivatives at three corner points are defined properly. We give the recursive expressions for the polyharmonic Neumann function, obtaining the solution and the condition of solvability for the related polyharmonic Neumann problem.

关键词： polyharmonic Neumann function Neumann problem convolution

Polymerization-Amplified Photoacoustic Signal by Enhancing Near-Infrared Light-Harvesting Capacity and Thermal-to-Acoustic Conversion

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Chinese Journal of Polymer Science 2022年第9期40卷 1090-1100页

作者： he-qi Gao Jing-Tian Zhang Xin-Wen qi Di Jiao Yu-Ning Hong Ke Shan Xiang-Long Kong Dan Ding Key Laboratory of Bioactive Materials Ministry of Educationand College of Life SciencesNankai UniversityTianjin 300071China Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Department of Chemistry and Physics La Trobe Institute for Molecular ScienceLa Trobe UniversityMelbourneVictoria3086Australia Shandong Artificial intelligence Institute and Shandong Computer Science Center Qilu University of TechnologyJinan 250353China

As a frontier imaging technique for biomedical applications,photoacoustic(PA)imaging has been developed *** development of new design strategies and excellent PA imaging reagents to boost PA conversion is eagerly desirable for high quality PA imaging but complicated to ***,we develop a new strategy in which PA imaging reagents with better properties can be easily optimized by polymerization.A series of new PA imaging reagents were designed and *** polymerization strategy can effectively promote the PA signal by specifically increasing the thermal-to-acoustic conversion *** these materials shared the same building units,the optimized effectiveness of polymerization strategy in terms of near-infrared light-harvesting capacity and thermal-to-acoustic conversion efficiency are discussed,*** polymers with intense intramolecular motion exhibit an amplified PA signal by elevating thermal-to-acoustic conversion and its higher light-harvesting capability at redshifted *** simultaneously strong PA signal and photothermal conversion efficiency of p-TTmB NPs enable precise PA imaging and effective photothermal *** work highlights a simple and available design guideline of polymerization for amplifying the PA effect and optimizing existing materials.

关键词： Intramolecular motion Thermal-to-acoustic conversion Photoacoustic imaging Photothermal conversion efficiency Polymerization

Effect of strain on exciton dynamics in monolayer WS2

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Chinese Physics B 2019年第8期28卷 306-310页

作者： Lu Zhang Da-Wei he Jia-qi he Yang Fu Yong-Sheng Wang Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University

The exciton dynamics in a WS2 monolayer with strain are studied by transient absorption *** measure the differential transmission signal from monolayer WS2 as a function of the probe wavelength at different levels of strain applied to the *** differential transmission spectrum has a positive maximum value at about 614 nm and shows no significant strain *** time-resolving the differential transmission signal,we find that the strain has a minimal effect on the exciton formation ***,the exciton lifetime is significantly reduced by *** results provide useful information for applications of WS2 in flexible electronic and optoelectronic devices where strain is inevitable.

关键词： transient absorption transition metal dichalcogenides excitons strain

Enhancement of the thermostability of β-1,3-1,4-glucanase by directed evolution

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第11期7卷 1948-1955页

作者： ZHANG Xiu-yan RUAN Hui MU Lin he Guo-qing TANG Xing-jun CheN qi-he Department of Food Science and Nutrition Zhejiang University Hangzhou 310029 China

In order to improve the thermostability of β- 1,3-1,4-glucanase, evolutionary molecular engineering was used to evolve the β-1,3-1,4-glucanase from Bacillus subtilis ZJF-1A5. The process involves random mutation by error-prone PCR and DNA shuffling followed by screening on the filter-based assay. Two mutants, EGsl and EGs2, were found to have four and five amino acid substitutions, respectively. These substitutions resulted in an increase in melting temperature from Tm=62.5℃ for the wild-type enzyme to Tm=65.5℃ for the mutant EGsl and 67.5℃ for the mutant EGs2. However, the two mutated enzymes had opposite approaches to produce reducing sugar from lichenin with either much higher （28%） for the former or much lower （21.6%） for the latter in comparison with their parental enzymes. The results demonstrate that directed evolution is an effective approach to improve the thermostability of a mesophilic enzyme.

关键词： Directed evolution Error-prone PCR DNA shuffling β- 1 3-1 4-glucanase Thermostability

Optimization of biotransformation from phytosterol to androstenedione by a mutant Mycobacterium neoaurum ZJUVN-08

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第2期14卷 132-143页

作者： Xiao-yan ZHANG Yong PENG Zhong-rui SU qi-he CheN Hui RUAN Guo-qing he Department of Food Science and Nutrition Zhejiang University Department of Food Science and Technology School of Agriculture and BiologyShanghai Jiao Tong University

Biotransformation of phytosterol(PS) by a newly isolated mutant Mycobacterium neoaurum ZJUVN-08 to produce androstenedione has been investigated in this *** parameters of the biotransformation process were optimized using fractional factorial design and response surface *** was the sole product in the fermentation broth catalyzed by the mutant *** ZJUVN-08 *** showed that molar ratio of hydroxypropyl-β-cyclodextrin(HP-β-CD) to PS and substrate concentrations were the two most significant factors affecting androstenedione *** analyzing the statistical model of three-dimensional surface plot,the optimal process conditions were observed at 0.1 g/L inducer,pH 7.0,molar ratio of HP-β-CD to PS 1.92:1,8.98 g/L PS,and at 120 h of incubation *** these conditions,the maximum androstenedione yield was 5.96 g/L and nearly the same with the non-optimized(5.99 g/L),while the maximum PS conversion rate was 94.69% which increased by 10.66% compared with the non-optimized(84.03%).The predicted optimum conditions from the mathematical model were in agreement with the verification experimental *** is considered that response surface methodology was a powerful and efficient method to optimize the parameters of PS biotransformation process.

关键词： Phytosterol Mycobacterium neoaurum ZJUVN-08 Androstenedione Hydroxypropyl-β-cyclodextrin

Facile preparation of hydrophilic glutathione modified magnetic nanomaterials for specific enrichment of glycopeptides

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Chinese Chemical Letters 2019年第12期30卷 2181-2185页

作者： he qi Zheng Li Haijiao Zheng Li Fu qiong Jia College of Chemistry Jilin UniversityChangchun 130012China The Second Hospital of Jilin University Changchun 130041China Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education School of Life SciencesJilin UniversityChangchun 130012China

Investigations of glycosylated proteins or peptides and their related biological pathways provide new possibilities for illuminating the physiological and pathological mechanisms of glycosylation ***,open-ended and in-depth analysis of glycoproteomics is usually subjected to the low-abundance of glycopeptides,heterogeneous glycans,and a variety of interference *** order to alleviate the influence of these obstacles,effective preconcentration of glycopeptides are ***,we employed a hydrophilic interaction liquid chromatography(HILIC)-based method to universally capture *** modified magnetic nanoparticles(Fe304@AuGSH) were synthesized through a simple process and exploited to enrich glycopeptides from complex *** prepared materials showed excellent ability to trap glycopeptides from standard glycoproteins digests,low detection limit(10 fmol/p L),and good selectivity(HRP:BSA=1:100).These results indicated that glutathione-based magnetic nanoparticles synthesized in this work had great potential for glycopeptides enrichment.

关键词： Hydrophilic Glutathione Magnetic Enrichment Glycopeptides

Intestinal obstruction in pregnancy with reverse rotation of the midgut:A case report

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World Journal of Clinical Cases 2020年第16期8卷 3553-3559页

作者： Xin-Yu Zhao Xin Wang Chun-qiang Li qi Zhang an-qi he Gang Liu epartment of General Surgery Tianjin Medical University General HospitalTianjin 300052China

BACKGROUND Reverse rotation of the midgut is a rare type of intestinal *** of the right colon or entire midgut,stenosis of the transverse colon and obstruction of the duodenojejunal junction are common complications of reverse *** this study,we report the first case of intestinal obstruction associated with reverse rotation in *** SUMMARY A 31-year-old woman at 362+wk gestation presented to the emergency department with progressive abdominal cramping,nausea and bilious *** ultrasound scanning showed dilatation of the *** tomography scanning revealed features of reverse rotation of the midgut with intestinal *** consultation with the obstetrician,the pregnancy was terminated and exploratory abdominal surgery was ***-operatively,it was found that the mesentery of the colon and small intestine was insufficiently *** right colon and the small intestinal mesentery was twisted,and intestinal necrosis was *** duodenum and duodenojejunal junction were curved in front of the transverse colon,and the transverse colon passed through the tunnel behind the mesenteric *** reverse rotation with volvulus was *** necrotic intestine was resected and small intestine mesenteric reconstruction was *** patient recovered after *** leaving the hospital,the patient and her daughter remained well during an 8-month follow-up *** We report the diagnosis,treatment and etiology of a pregnant patient with intestinal obstruction due to reverse rotation of the *** similar cases,appropriate diagnosis and treatment should be carried out according to the condition of the fetus and pregnant woman.

关键词： Congenital intestinal malrotation Volvulus Reverse rotation of the midgut Intestinal obstruction Pregnancy Case report