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SYNTHESIS AND PROPERITIES OF SHISH-KEBAB-TYPE liQUID CRYSTALliNE POLY(p-PHENYLENE)S

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Chinese Journal of Polymer Science 2006年第3期24卷 265-271页

作者：郑世军 Kazuo Akagi qun Xua Zi-fa li Shao-kui Cao qi-feng Zhou College of the Material Science and Engineering Zhengzhou University Zhengzhou 450052 China Institute of Materials Science University of Tsukuba Tsukuba 305-8573 Japan Department of Polymer Science and Engineering College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Abstract The novel shish-kebab-type liquid crystalline poly（p-phenylene）s were synthesized through Suzuki coupling reaction from 2,5-bis[（4-n-alkoxyl）benzoyloxy]1,4-dibromobenzene （monomer 1） and 1,4-benzenediboronic acid bistrimethylene cyclic ester （monomer 2）. Their structure and properties were characterized by GPC, DSC, X-ray diffraction and polarizing optical microscope （POM）. It was found that the polymers turned to liquid crystalline phase above their melting point. The melting point （Tm） of the polymers decreases when the length of the alkoxy tails of the mesogenic units increases. The mesophase was identified by X-ray diffraction method. The polymers could dissolve in common organic solvents and show strong blue fluorescence. The maximum absorption bands of polymers prepared from annealed films have large red-shift due to the spontaneous orientation of the liquid crystalline side chains. The same phenomena were also observed in the fluorescence spectra.

关键词： Conjugated polymer liquid crystal Shish-kebab Fluorescence

Combination of propofol and dezocine to improve safety and efficacy of anesthesia for gastroscopy and colonoscopy in adults: A randomized, double-blind, controlled trial

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World Journal of Clinical Cases 2019年第20期7卷 3237-3246页

作者： Xue-Ting li Chao-qun Ma Si-Hua qi li-Min Zhang Department of Anaesthesiology The Fourth Affiliated HospitalHarbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Neurosurgery Harbin 242 HospitalHarbin 150066Heilongjiang ProvinceChina

BACKGROUND Gastroscopy and colonoscopy are important and common endoscopic methods for the diagnosis and treatment of gastrointestinal and colorectal ***,endoscopy is usually associated with adverse reactions such as nervousness,nausea,vomiting,choking cough,and *** discomfort,such as vomiting,coughing,or body movement,may lead to aggravation of a preexisting condition or even interruption of examination or treatment,especially in some critically ill patients with physiological dysfunction(e.g.,cardiovascular or respiratory disease).The optimal methods for inducing analgesia and sedation in endoscopy are areas of ongoing debate;nevertheless,determining an appropriate regimen of sedation and analgesia is *** To evaluate the effects of propofol combined with dezocine,sufentanil,or fentanyl in painless gastroscopy and *** Four hundred patients were randomly assigned to one of four groups for anesthesia:intravenous dezocine,sufentanil,fentanyl,or *** was administered intravenously for induction and maintenance of *** The dosage of propofol in the dezocine group was significantly lower than those in other groups(P<0.01).Bispectral index and Steward score(0-6 points,an unresponsive,immobile patient whose airway requires maintenance to a fully recovered patient)after eye opening in the dezocine group were significantly higher than those in other groups(P<0.01).Awakening time and postoperative pain score(0-10 points,no pain to unbearable pain)in the dezocine group were significantly lower than those in other groups(P<0.01).Mean arterial pressure and pulse oxygen saturation in the dezocine group were significantly more stable at various time points(before dosing,disappearance of eyelash reflex,and wakeup)than those in other groups(P<0.01).The rates of hypopnea,jaw thrust,body movements,and usage of vasoactive drugs in the dezocine group were significantly lower than those in other groups(P<0.01).Additi

关键词： Anesthesia Dezocine Propofol Gastroscopy Colonoscopy

DEM investigation of strain behaviour and force chain evolution of gravel-sand mixtures subjected to cyclic loading

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Particuology 2022年第9期20卷 13-28页

作者： Zhihong Nie qun qi Xiang Wang Yangui Zhu School of Civil Engineering Central South UniversityChangsha 410075China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China China Railway First Survey and Design Institute Group Co. Ltd.Xi'an 710043China

The strain characteristic and load transmission of mixed granular matter are different from those of homogeneous granular *** loading renders the mechanical behaviours of mixed granular mat-ter more *** investigate the dynamic responses of gravel-sand mixtures,the discrete element method(DEM)was used to simulate the cyclic loading of gravel-sand mixtures with low fines ***,the evolution of the axial strain and volumetric strain was ***-cally,the coordination number and contact force anisotropy were studied,and the evolution of strong and weak contacts was explored from two dimensions of loading time and local *** simulation results show that increasing fines content can accelerate the development of the axial strain and vol-umetric strain but has little effect on the evolution of contact *** contacts tend to develop along the loading boundary,presenting the spatial *** contacts are firstly controlled by confining pressure and then controlled by axial stress,while strong contacts are mainly controlled by axial stress throughout the whole cyclic *** compression failure occurs,the release of axial stress causes the reduction of strong contact proportion in all local *** findings are helpful to understand the dynamic responses of gravel-sand mixtures,especially in deformation behaviours and the Spatio-temporal evolution of contact forces.

关键词： Gravel-sand mixture Cyclic loading DEM Strain Contact force

Normal Bases and Their Dual-Bases over Finite Fields

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Acta Mathematica Sinica,English Series 2006年第3期22卷 845-848页

作者： qun Ying liAO qi SUN The Mathematical College of Sichuan University The Mathematical and Soft-Ware Scientific College of Sichuan Normal University

In this paper, we prove the following results： 1） A normal basis N over a finite field is equivalent to its dual basis if and only if the multiplication table of N is symmetric; 2） The normal basis N is self-dual if and only if its multiplication table is symmetric and Tr（α^2） = 1, where α generates N; 3） An optimal normal basis N is self-dual if and only if N is a type-Ⅰ optimal normal basis with q = n = 2 or N is a type-Ⅱ optimal normal basis.

关键词： Normal bases over finite fields Optimal normal bases Multiplication tables of normal bases

A survey of federated learning for edge computing:Research problems and solutions

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High-Confidence Computing 2021年第1期1卷 55-67页

作者： qi Xia Winson Ye Zeyi Tao Jindi Wu qun li Department of Computer Science College of William and Mary 251 Jamestown Rd.WilliamsburgVA 23185USA

Federated Learning is a machine learning scheme in which a shared prediction model can be collaboratively learned by a number of distributed nodes using their locally stored *** can provide better data privacy be-cause training data are not transmitted to a central *** learning is well suited for edge computing applications and can leverage the the computation power of edge servers and the data collected on widely dis-persed edge *** build such an edge federated learning system,we need to tackle a number of technical *** this survey,we provide a new perspective on the applications,development tools,communication efficiency,security&privacy,migration and scheduling in edge federated learning.

关键词： Federated learning Edge computing

Chondroitinase ABC combined with Schwann cell transplantation enhances restoration of neural connection and functional recovery following acute and chronic spinal cord injury

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Neural Regeneration Research 2025年第5期20卷 1467-1482页

作者： Wenrui Qu Xiangbing Wu Wei Wu Ying Wang Yan Sun lingxiao Deng Melissa Walker Chen Chen Heqiao Dai qi Han Ying Ding Yongzhi Xia George Smith Rui li Nai-Kui liu Xiao-Ming Xu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA Department of Hand Surgery the Second Hospital of Jilin UniversityChangchunJilin ProvinceChina Shriners Hospitals Pediatric Research Center Temple University School of MedicinePhiladelphiaPAUSA Department of Anatomy&Cell Biology Indiana University School of MedicineIndianapolisINUSA

Schwann cell transplantation is considered one of the most promising cell-based therapy to repair injured spinal cord due to its unique growth-promoting and myelin-forming properties.A the Food and Drug Administration-approved Phase I clinical trial has been conducted to evaluate the safety of transplanted human autologous Schwann cells to treat patients with spinal cord injury.A major challenge for Schwann cell transplantation is that grafted Schwann cells are confined within the lesion cavity,and they do not migrate into the host environment due to the inhibitory barrier formed by injury-induced glial scar,thus limiting axonal reentry into the host spinal *** we introduce a combinatorial strategy by suppressing the inhibitory extracellular environment with injection of lentivirus-mediated transfection of chondroitinase ABC gene at the rostral and caudal borders of the lesion site and simultaneously leveraging the repair capacity of transplanted Schwann cells in adult rats following a mid-thoracic contusive spinal cord *** report that when the glial scar was degraded by chondroitinase ABC at the rostral and caudal lesion borders,Schwann cells migrated for considerable distances in both rostral and caudal *** Schwann cell migration led to enhanced axonal regrowth,including the serotonergic and dopaminergic axons originating from supraspinal regions,and promoted recovery of locomotor and urinary bladder ***,the Schwann cell survival and axonal regrowth persisted up to 6 months after the injury,even when treatment was delayed for 3 months to mimic chronic spinal cord *** findings collectively show promising evidence for a combinatorial strategy with chondroitinase ABC and Schwann cells in promoting remodeling and recovery of function following spinal cord injury.

关键词： axonal regrowth bladder function chondroitinase ABC functional recovery glial scar lentivirus migration Schwann cell spinal cord injury transplantation

New development of anodizing process of magnesium alloys

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中国有色金属学会会刊：英文版 2004年第z1期14卷 120-125页

作者： BAI li-qun li Di School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

Magnesium alloy, a kind of environment-friendly material with promising and excellent properties, is a good choice for a number of applications. The research and development of anodizing on magnesium alloys and its ap... 详细信息

关键词： magnesium magnesium alloy anodizing

Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： lin-Yan Huang Yi-De Zhang Jie Chen Hai-Di Fan Wan Wang Bin Wang Ju-Yun Ma Peng-Peng li Hai-Wei Pu Xin-Yian Guo Jian-Gang Shen Su-Hua qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

Prototype of the readout electronics for the RICH PID detector in the STCF

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Nuclear Science and Techniques 2022年第6期33卷 148-160页

作者： Bao-lin Hou Lei Zhao Jia-Jun qin Ye-qun qi Jia-Ming li Zi-Yu Yang Shu-Bin liu qi An State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

The ring imaging Cherenkov(RICH) detector for particle identification(PID) is being evaluated for the future super tau-charm facility(STCF) complex. In this work, the prototype readout electronics for the RICH PID detector is designed. The prototype RICH PID detector is based on a thick gas electron multiplier combined with a micromegas detector for Cherenkov light detection. Considering that there will be a large number(~ 690,000) of detector channels in future RICH detector, the readout electronics faces many challenges to precisely measuring time and charge information, such as reducing the noise,increasing density, and improving precision. The requirements of the readout electronics are explored, the downselection of the ASICs is made and thus a prototype readout electronics is designed and implemented. Tests are also conducted to evaluate the performance of the prototype readout electronics, and the results indicate that the time resolution is better than ~ 1 ns(RMS) when the input charge is greater than ~ 12 fC based on the APV25chip, while the time resolution is better than ~ 1 ns(RMS) at an input charge of over ~ 48 fC based on the AGET and STCF ASIC chips, and the equivalent noise charge is better than ~ 0.5 fC(RMS) @ 20 pF based on the three ASICs. The test results indicate that the prototype readout electronics design meets the requirement of the future RICH PID detector and thus provides a reference for future engineering.

关键词： Readout electronics Time measurement Charge measurement RICH PID detector STCF