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Broadband channel measurement and analysis

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 24-28页

作者： ZHANG Ming ZHANG Jian-hua jiang jun ZHANG Ping WU Yu-fei Wireless Technology Innovation Labs (WTI) Beijing University of Posts and Telecommunications Beijing 100876 China

An outdoor propagation measurement campaign for beyond 3G （B3G） as well as a wide-band indoor measurement campaign have been performed recently in Beijing, China, in which the sounding signals are transmitted by an one-antenna base station and received by a two-antenna mobile receiver operated at 3.49～3.51 GHz bandwidth. Different scenarios： stationary line-of-sight （LoS）, stationary non-LoS （NLoS） scenarios, and dynamic NLoS are deliberately chosen in a classic urban environment and office environment. The initial results are presented in this article. Parameters including vector channel impulse response, path loss, rays number, excess delay spread etc. are extracted, analyzed, and briefly reported here.

关键词： Broadband measurement Beyond 3G path loss,multipath delay rays number

Ulnar nerve injury associated with displaced distal radius fracture:Two case reports

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World Journal of Clinical Cases 2021年第23期9卷 6956-6963页

作者： Jing-Jing Yang Wei Qu Yu-Xuan Wu hua-jun jiang Department of Neurology The First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina Department of Orthopaedics The First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina

BACKGROUND Ulnar nerve injury subsequent to a fracture of the distal radius is extremely rare compared to median nerve *** of ulnar nerve injury after closed distal radial fracture is *** surgical planning and careful postoperative management can improve the prognosis of *** SUMMARY We report two cases of ulnar nerve injury subsequent to fracture of the distal *** patients were admitted to *** patients had persistent ulnar nerve compression *** first patient achieved rapid recovery by early nerve decompression surgery,while the second patient had no recovery at 2-3 mo after injury and had more severe *** 10 wk after injury,the second patient agreed to nerve decompression *** second patient finally achieved a successful outcome after nerve decompression and neurolysis,although she still has residual *** For patients with ulnar nerve compression syndrome related to acute wrist fracture,if symptoms persist and signs of recovery are not observed,early release is necessary to prevent permanent neurological damage.

关键词： Ulnar nerve injury Distal radius fracture Fracture treatment Early release Case report

FK506 effects on proliferation and secretion of Schwann cells

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Neural Regeneration Research 2011年第1期6卷 29-33页

作者： hua jun jiang Wei Qu Feng Han Wei guo Zhang De cheng Lu Department of Orthopaedics First Affiliated Hospital Dalian Medical University Dalian 116011 Liaoning Province China

The immunosuppressive agent FK506 contributes to neural regeneration via growth cone and Schwann cell processes. However, it is difficult to rapidly harvest a large number of Schwann cells, and Schwann cell senescence is obvious following culture, proliferation, and amplification. The present study investigated the effects of various concentrations of FK506 on proliferation and secretion of cultured Schwann cells. In addition, the suitability of FK506 application as tissue engineered artificial nerves was considered. Bilateral sciatic nerves of 3-5-day old, Sprague Dawley rats were obtained, and primary cultured Schwann cells were identified by S-100 protein staining. Following subculture, Schwann cells purity was 〉 90%. After 3-5 days in culture, Schwann cell proliferation was visible in each group. Results verified that FK506 promoted proliferation of cultured Schwann cells and secretion of nerve growth factor. This effect was significant at a low concentration （1 × 10.8 mol/L）.

关键词： Schwann cells nerve growth factor MTT enzyme-linked immunosorbent assay FK506

Isolated scaphoid dislocation:A case report and review of literature

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World Journal of Clinical Cases 2022年第8期10卷 2559-2568页

作者： Si-Da Liu Bao-Sheng Yin Feng Han hua-jun jiang Wei Qu Department of Orthopedics The First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina

BACKGROUND Isolated dislocations of the scaphoid are extremely rare types of injuries,commonly associated with severe ligament disruptions,and are occasionally *** options for dislocations of the scaphoid mainly include closed reduction,with or without internal fixation,and open reduction with ligament *** SUMMARY A 59-year-old male worker sustained a twisting trauma of his right wrist,caused by a moving belt while he was operating a *** he presented at our emergency department,the patient complained of swelling,tenderness,and restriction of movement of the right *** confirmed a primary complex partial radial dislocation of the scaphoid and some chip fractures of the capitate and *** reduction with K-wire internal fixation was performed with the assistance of arthroscopy,and an excellent prognosis was *** Arthroscopy-assisted reduction is a minimally invasive method to reduce the dislocated scaphoid and maintain the blood supply.

关键词： Isolated scaphoid dislocation Classification Delayed diagnose Treatment options Wrist arthroscopy Case report

The dynamics beamline at SSRF

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NUCLEAR SCIENCE AND TECHNIQUES 2024年第9期35卷 1-12页

作者： Liu, Zhen Wang, Li-hua jiang, Yong Tong, Ya-jun Zhu, hua-Chun Ji, Te Chen, Min jiang, Zheng Wei, Xiang-jun Chinese Acad Sci Shanghai Adv Res Inst Shanghai 201204 Peoples R China ShanghaiTech Univ Shanghai 201210 Peoples R China

The dynamics beamline (D-Line), which combines synchrotron radiation infrared spectroscopy (SR-IR) and energy-dispersive X-ray absorption spectroscopy (ED-XAS), is the first beamline in the world to realize concurrent ED-XAS and SR-IR measurements at the same sample position on a millisecond time-resolved scale. This combined technique is effective for investigating rapid structural changes in atoms, electrons, and molecules in complicated disorder systems, such as those used in physics, chemistry, materials science, and extreme conditions. Moreover, ED-XAS and SR-IR can be used independently in the two branches of the D-Line. The ED-XAS branch is the first ED-XAS beamline in China, which uses a tapered undulator light source and can achieve approximately 2.5 x 1012 photons/s300 eV BW@7.2 keV at the sample position. An exchangeable polychromator operating in the Bragg-reflection or Laue-transmission configuration is used in different energy ranges to satisfy the requirements for beam size and energy resolution. The focused beam size is approximately 3.5 mu m (H) x 21.5 mu m (V), and the X-ray energy range is 5-25 keV. Using one- and two-dimensional position-sensitive detectors with frame rates of up to 400 kHz enables time resolutions of tens of microseconds to be realized. Several distinctive techniques, such as the concurrent measurement of in situ ED-XAS and infrared spectroscopy, time-resolved ED-XAS, high-pressure ED-XAS, XMCD, and pump-probe ED-XAS, can be applied to achieve different scientific goals.

关键词： ED-XAS SR-IR Time-resolved D-line SSRF SYNCHROTRON-RADIATION DISPERSIVE MODE SPECTROSCOPY PRESSURE EXAFS SPECTROMETER DICHROISM DETECTOR XAFS IR

Multifunctional phase change film with high recyclability, adjustable thermal responsiveness, and intrinsic self-healing ability for thermal energy storage

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Journal of Energy Chemistry 2024年第10期97卷 216-227页

作者： Bo Yang Xuelai Zhang jun Ji Weisan hua Miaomiao jiang Institute of Cool Thermal Storage Technology Shanghai Maritime University

Phase change materials(PCMs) present promising potential for guaranteeing safety in thermal management ***,most reported PCMs have a single application in energy storage for thermal management systems,which does not meet the growing demand for multi-functional *** this paper,the flexible material and hydrogen-bonding function are innovatively combined to design and prepare a novel multi-functional flexible phase change film(PPL).The 0.2PPL-2 film exhibits solid-solid phase change behavior with energy storage density of 131.8 J/g at the transition temperature of42.1℃,thermal cycling stability(500 cycles),wide-temperature range flexibility(0-60℃) and selfhealing ***,the PPL film can be recycled up to 98.5% by intrinsic ***,the PPL film can be tailored to the desired colors and configurations and can be cleverly assembled on several thermal management systems at ambient temperature through its flexibility combined with shape-memory *** interestingly,the transmittance of PPL will be altered when the ambient temperature changes(60℃),conveying a clear thermal ***,the thermal energy storage performance of the PPL film is successfully tested by human thermotherapy and electronic device temperature control *** proposed functional integration strategy provides innovative ideas to design PCMs for multifunctionality,and makes significant contributions in green chemistry,highefficiency thermal management,and energy sustainability.

关键词： Energy storage Multifunctional material Phase change film Recyclability Self-healing

Expression of heregulin and ErbB receptors in mesenchymal stem cells

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Chinese Medical Journal 2008年第2期121卷 155-160页

作者： GUI Chun WANG Jian-an HE Ai-na CHEN Tie-long LIU Xian-bao LUO Rong-hua jiang jun Division of Cardiology Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang 310009 China

Background Mesenchymal stem cells are a promising cell type for cell transplantation in myocardial infarction. Type I neuregulins-1, also known as heregulin, can promote the survival of cardiomyocytes and stimulate angiogenesis. The purpose of this study was to investigate the expression of heregulin and ErbB receptors in mesenchymal stem cells, then further detect the secretion of heregulin and the changes in expression of heregulin and ErbB receptors under conditions of serum deprivation and hvooxia. Methods Mesenchymal stem cells isolated from bone marrow of 180 g male Sprague-Dawley rats were cultured. Passage 3 cells were detected experimentally by regular reverse transcriptase-polymerase chain reaction （RT-PCR）, quantitative real time PCR and Western blotting.Results Heregulin and ErbB receptors were expressed in mesenchymal stem cells, and all three ErbB receptors mRNA expressions were significantly down-regulated by serum deprivation and hypoxia, but serum deprivation and hypoxia significantly increased the protein expression of heregulin. Serum deprivation and hypoxia more than 12 hours could induce the secretion of heregulin.Conclusions Mesenchymal stem cells can express all three ErbB receptors and heregulin. Serum deprivation and hypoxia decrease the mRNA expression of ErbB receptors, increase the expression of heregulin, and activate the secretion of heregulin.

关键词： heregulin ErbB receptor mesenchymal stem cell serum deprivation hypoxia

Electrocatalytic performance of CNTs/graphene composited rare earth phthalocyanines(M=La,Y,Yb,Sc)

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Journal of Rare Earths 2024年第2期42卷 323-333,I0004页

作者： Tingting jiang Caixia Ou Luyi Wang jun Chen Sydorov Dmytro Qian Zhang Jintian Luo hua Wang jiangxi Key Laboratory of Power Batteries and Materials Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000China Joint Department of Electrochemical Energy Systems Institute of Bioorganic Chemistry and PetrochemistryNational Academy of Sciences of Ukraine38A VernadskyAveKiev03142Ukraine Guangdong Jiana Energy Technology Co. Ltd.Qingyuan511500China

In this study,a class of rare earth composite sandwich phthalocyanines(MPcs,M=La,Y,Yb,Sc) were prepared and compounded with graphene and carbon nanotubes to obtain MPc/Gr and MPc/CNTs *** electrocatalytic behaviors of MPc/Gr and MPc/CNTs electrodes were further *** results show that the central rare earth metal has a large influence on the electrocatalytic *** the MPcs/Gr samples,ScPc with the smallest ionic radius and molecular size can be more uniformly dispersed in graphene,and the hydrogen precipitation overpotential of ScPc/Gr electrode is514 mV,corresponding to a Tafel slope of 148 mV/dec,with better electrocatalytic performance than other rare earth metal *** for the MPc/CNTs composites,LaPc,which has the largest ionic radius and molecular size,is more uniformly dispersed on the surface of CNTs,so that the LaPc/CNT electrode exhibits the best LSV performance with the smallest corresponding Tafel slope(176 mV/dec).The main reason is the different binding modes of MPcs molecules in Gr and *** rare earth phthalocyanine is combined with layered graphene,the smallest size of rare earth phthalocyanine(ScPc)is more easily embedded in the graphene layer,resulting in better homogeneity of the composite,larger effective contact area and better electrocatalytic *** contrast,when rare earth phthalocyanine is bound to carbon nanotubes in a tubular structure,it is mainly bound by attaching to the surface or being entangled by the carbon *** this case,the rare-earth phthalocyanine molecules(LaPc)with larger layer spacing can provide more contact area with CNTs,forming a more uniform and effective composite,which eventually provides more active sites and better electrocatalytic performance.

关键词： Electrocatalysis Rare earth phthalocyanines Graphene(Gr) Carbon nanotubes(CNTs) Composite

Sequential enantioselective Ugi-4CR/post-Ugi transformation strategy:a precise construction of structurally diverse azaspiro polycyclic scaffolds

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Science China Chemistry 2024年第2期67卷 576-586页

作者： Xiao-Bao Wu jun-Xiu Shi Yi-Ming Ou hua-Jie jiang Yi-jun Fang Qi-Ming Wang Quan Gao Jie Yu Department of Applied Chemistry Anhui Province Engineering Laboratory for Green Pesticide Development and ApplicationAnhui Province Key Laboratory of Crop Integrated Pest ManagementAnhui Agricultural UniversityHefei230036China

A privileged strategy has been developed for the precise construction of enantioenriched azaspiro polycyclic *** diverse azaspiro polycycles bearing multiple contiguous stereocenters are obtained with excellent results(up to 99:1 e.r.,>95:5 d.r.) via sequential enantioselective four-component Ugi reactions/post-Ugi transformations with substrates containing prerequisite functional groups in the presence of anionic stereogenic-at-cobalt(Ⅲ) complexes.

关键词： asymmetric catalysis post-Ugi transformation anionic stereogenic-at-cobalt(Ⅲ)complex azaspiro polycyclic scaffold one-pot synthesis