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Nano-Micro Letters 2023年第10期15卷 463-477页

作者： Yumin Ren kai Zhang Zedong Lin Xiaozhen Wei man Xu Xianzhen Huang Haining Chen Shihe Yang Guangdong Provincial Key Lab of Nano‑Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055People’s Republic of China Shenzhen Bay Laboratory Institute of Biomedical EngineeringShenzhen 518107GuangdongPeople’s Republic of China School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China

Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in ambient ***,scaling up to high-efficiency carbon-based solar modules hinges on reliable deposition of uniform defect-free perovskite films over large areas,which is an unsettled but urgent *** this work,a long-chain gemini surfactant is introduced into perovskite precursor ink to enforce self-assembly into a network structure,considerably enhancing the coverage and smoothness of the perovskite *** long gemini surfactant plays a distinctively synergistic role in perovskite film construction,crystallization kinetics modulation and defect passivation,leading to a certified record power conversion efficiency of 15.46%with Voc of 1.13 V and Jsc of 22.92 mA cm^(-2)for this type of ***,all of the functional layers of the module are printed through a simple and high-speed(300 cm min^(-1))blade coating strategy in ambient *** results mark a significant step toward the commercialization of all-printable carbon-based perovskite solar modules.

关键词： Long-chain gemini surfactant Blade-coating Capillary number Carbon-based perovskite photovoltaics All-printable module

Design and commissioning of Brav measurement system for SC200 superconducting cyclotron

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Nuclear Science and Techniques 2019年第6期30卷 57-62页

作者： man-man Xu Yun-Tao Song Gen Chen Yong-Hua Chen kai-Zhong Ding Heng-Bo Li Jun Wang Jian Zhou School of Mechanical and Automotive Engineering Anhui Polytechnic University Wuhu 241000 China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230026 China Hefei CAS Ion Medical and Technical Devices Co. Ltd Hefei 230088 China

The SC200 proton therapy superconducting cyclotron was developed by ASIPP (Hefei, China) and JINR (Dubna, Russia). A measurement system was designed to assess the average radial component of the magnetic field (Brav) with 15 search coils in the median plane. The winding differences of the search coils affect the measurement accuracy of the Brav. Based on the electromagnetic induction principle, to measure the Brav accurately, this paper focuses on the design and commissioning of the Brav measurement system. The preliminary results confirm that the system design is reasonable and suitable. After testing the search coil at different speeds, the optimal speed was determined as 2.5 mm/s. The relative error was approximately 0.1% under the maximum radial component of the magnetic field Br of 7 G. The measurement precision was up to 1.0×10^-3, which can provide the required measurement tolerance of 3–7 G for Br in the median plane. The commissioning of the Brav measurement system is an important step for Br measurement. It can check and adjust the asymmetry of the superconducting coils (SCs).

关键词： Superconducting cyclotron Magnetic field Measurement system Commissioning

Microstructural evolution and mechanical properties of an Fe–18Ni–16Cr–4Al base alloy during aging at 950°C

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International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 314-322页

作者： man Wang Yong-duo Sun Jing-kai Feng Rui-qian Zhang Rui Tang Zhang-jian Zhou School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

The development of Gen-IV nuclear systems and ultra-supercritical power plants proposes greater demands on structural materials used for key components. An Fe-18Ni-16Cr-4Al（316-base） alumina-forming austenitic steel was developed in our laboratory. Its micro- structural evolution and mechanical properties during aging at 950℃were investigated subsequently. Microstructural changes were charac- terized by scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. Needle-shaped NiAI parti- cles begin to precipitate in austenite after ageing for 10 h, whereas round NiA1 particles in ferrite are coarsened during aging. Precipitates of NiAI with different shapes in different matrices result from differences in lattice misfits. The tensile plasticity increases by 32.4% after aging because of the improvement in the percentage of coincidence site lattice grain boundaries, whereas the tensile strength remains relatively high at approximately 790 MPa.

关键词： austenitic steel alumina aging precipitates mechanical properties microstructural evolution nuclear power plants

Hepatic venous outflow obstruction after piggyback liver transplantation by an unusual mechanism:Report of a case

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World Journal of Gastroenterology 2006年第33期12卷 5416-5418页

作者： Simon siu-man Ng Simon Chun-Ho Yu Janet Fung-Yee Lee Paul Bo-San Lai Wan-Yee Lau Departments of Surgery and Diagnostic Radiology & Organ Imaging Chinese University of Hong Kong Prince of Wales Hospital Shatin Hong Kong China

Hepatic venous outflow obstruction after piggyback liver transplantation is a very rare complication. An unusual mechanism aggravating it is reported. A 33-year-old man with end-stage hepatitis B liver cirrhosis underwent a piggyback orthotopic liver transplantation using a full-size cadaveric graft. Two months after transplantation, he developed gross ascites refractory to maximal diuretic therapy. Doppler ultrasound showed patent portal and hepatic veins. Serial computed tomography scans revealed a hypoperfused right posterior segment of the liver which subsequently underwent atrophy. Hepatic venography demonstrated a high-grade stenosis with an element of torsion of venous drainage at the anastomosis. The stenosis was successfully treated with repeated percutaneous balloon angioplasty. The patient remained asymptomatic six months afterwards with complete resolution of ascites and peripheral edema. We postulate that liver allograft segmental hypoperfusion and atrophy may aggravate or result in a hepatic venous outflow problem by the mechanism of torsion effect. Percutaneous balloon angioplasty is a safe and effective treatment modality for anastomotic stenosis.

关键词： Hepatic venous outflow obstruction Piggyback Liver transplantation Percutaneous balloon angioplasty

Small Molecule Organic Nanostructures—Fabrication and Properties

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Journal of Materials Science & Technology 2008年第4期24卷 563-568页

作者： A.B.Djurii A.M.C.Ng kai-Yin CHEUNG man-Kin FUNG Wai-Kin CHAN Department of Physics University of Hong KongPokfulam RoadHong KongHong Kong SARChina Department of Chemistry University of Hong KongPokfulam RoadHong KongHong Kong SARChina

Organic materials are of great interest for the development of low cost electronic and optoelectronic devices. Although majority of research on organic materials is concerned with synthesis of novel compounds and organic thin films, organic nanostructures are attracting increasing interest in recent years. We briefly review different growth methods of organic nanostructures, which can be roughly divided into vapor deposition methods and self-assembly techniques in solution. Then we highlight some interesting properties of organic nanostructures, as well as possible applications, includinf field emission, electronic and optoelectronic devices.

关键词： Organic nanostructures Self-assembly Vapor deposition

Long-term clinical outcomes of drug-eluting stents ***-metal stents in Chinese geriatric patients

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Journal of Geriatric Cardiology 2013年第4期10卷 330-335页

作者： Pak-Hei Chan Sha-Sha Liu Hung-Fat Tse Wing-Hing Chow man-Hong Jim Hee-Hwa HO Chung Wah siu Department of Medicine Li Ka Shing Faculty of Medicine The University of Hong Kong 102 Pokfulam Rd Hong Kong China Cardiac Medical Unit Grantham Hospital 125 Wong Chuk Hang Rd Aberdeen Hong Kong China

BACKGROUND & OBJECTIVE: Little is known about the relative efficacies of percutaneous coronary intervention (PCI) with drug-eluting stents (DES) and bare-metal stents (BMS) in elderly patients。 The objective of this study was to evaluate the clinical outcome for geriatric patients who received either DES or BMS。 METHODS: From January 2002 to October 2005, 199 consecutive Chinese geriatric patients (≥ 75 years old) underwent PCI with coronary DES or BMS implantation at our institution。 We analyzed the major clinical end points that included all-cause mortality, cardiovascular death, myocardial infarction, target lesion revascularization (TLR), stent thrombosis, and bleeding complications。 RESULTS: The three-year cumulative rates of all-cause mortality, cardiovascular death, and myocardial infarction were significantly lower in the DES group (6.3%,3.6%,5.4%) compared with the BMS group (16.2%,11.5%,14.9%; P <0.05)。 No significant differences were found in the three-year cumulative rate for target lesion revascularization (6.3% vs4.6%, P =0.61) or stent thrombosis (3.6% vs2.3%, P =0.70)。 Likewise, there were no statistically significant differences in the cumulative rate for intracranial hemorrhage, or major and minor hemorrhage at three years。 CONCLUSIONS: DES-based PCI was associated with a significant reduction in the three-year cumulative rate of all-cause mortality, cardiovascular death, and myocardial infarction compared with BMS, without increased risk of TLR, stent thrombosis, or bleeding complications at three years in this group of Chinese geriatric patients。

关键词： Bare-metal stents Drug-eluting stents Geriatric patients Percutaneous coronary intervention

Facile synthesis of Ni-,Co-,Cu-metal organic frameworks electrocatalyst boosting for hydrogen evolution reaction

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Journal of Materials Science & Technology 2021年第13期72卷 172-179页

作者： man Zhang Di Hu Zhenhao Xu Biying Liu Mebrouka Boubeche Zuo Chen Yuchen Wang Huixia Luo kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Key Lab of Polymer Composite&Functional Materials School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou510275China

The conductive metal-organic frameworks(MOFs)are suggested as the ideal electrocatalysts for hydrogen evolution reaction(HER)because of the high utilization of metal *** design and facile synthesis of MOFs with large specific surface area,proper metals as center,and tunable chemical components is still full of ***,we report the facile synthesis three types of porous MOFs by regulating metal center using benzene-1,3,5-tricarboxylic acid(H3 BTC)as organic ligand and have successfully synthesized the rhombic octahedral Cu-BTC,rod-shaped Co-BTC and spherical Ni-BTC materials with large specific surface area ranged in 350-500 m^(2)g^(-1).These as-prepared MOFs materials exhibit high performance of HER in 0.5 M H_(2)SO_(4).Ni-BTC material exhibits the lowest overpotential of 53 mV at 10 mA cm-2 and the smallest Tafel slope of 62 mV dec^(-1)than those of Cu-BTC(270 mV,155 mV dec^(-1))and Co-BTC(123 mV,100 mV dec^(-1)),which are much superior to these previously reported MOFs *** addition,the fast catalytic kinetic of Ni-BTC was confirmed by the smaller charge transfer resistance(Rct)value of 0.9Ωand larger electrochemical active surface area(ECSA)of 35.5 cm^(2)than those of Cu-BTC(8.2Ω,22.5 cm^(2))and Co-BTC(1.9Ω,27.7 cm^(2)).Because of the structural advantage and large ECSA,the turnover frequency(TOF)value of Ni-BTC reaches up to 0.041 s-1 at 120 mV overpotential,which is 20.5 and 2.6 times greater than that of Cu-BTC(0.002 s-1)and Co-BTC(0.016 s-1).Besides,these three types of MOFs exhibited excellent durability over 12 *** study unfolds diverse insights into the design and facile synthesis of MOFs for electrochemical energy conversion system.

关键词： Metal-organic frameworks Hydrogen evolution reaction Activity Overpotential Durability

In situ growth of hydrophilic nickel-cobalt layered double hydroxides nanosheets on biomass waste-derived porous carbon for high-performance hybrid supercapacitors

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Green Chemical Engineering 2022年第1期3卷 55-63页

作者： Yuchen Wang Yaoyu Liu Zuo Chen man Zhang Biying Liu Zhenhao Xu kai Yan School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou510275China

Rational design and cost-effective fabrication of layered double hydroxides(LDHs)nanosheets with extraordinary electrochemical performance is a key challenge for hybrid supercapacitors(HSCs).Herein,we report a facile in situ growth methodology to eco-friendly synthesize hydrophilic Ni Co-LDHs nanosheets on biomass waste-derived porous carbon(BC)for robust high-performance HSC *** in situ growth process under ultrasonication realizes the rational arrangement of Ni Co-LDHs nanosheets on the surface of BC,which effectively increases the specific surface area,promotes the electronic conductivity and enhances the wettability of Ni Co-LDHs nanosheets without affecting their thickness *** the beneficial effects of ultrathin thickness of LDHs nanosheets(6.20 nm),large specific surface area(2324.1 m^(2)g^(-1)),low charge transfer resistance(1.65Ω),and high wettability with electrolyte(34°–35°),the obtained Ni2Co1-LDHs/BC50 electrode possesses an ultra-high specific capacitance of 2390 F g^(-1)(956 C g^(-1))at 1 A g^(-1),which is superior to most reported ***,an assembled Ni_(2)Co_(1)-LDHs/BC50//YP-80F HSC delivers a maximum specific energy of 52.47 Wh kg^(-1)at375 W kg^(-1),and maintains a high capacitance retention of 75.9%even after 4000 *** work provides a facile approach to fabricate LDHs nanosheets based cathode materials for high-performance HSCs.

关键词： Layered double hydroxides Nanosheets Biomass-derived porous carbon Wettability Hybrid supercapacitor

Anomalous Thermopower and High ZT in GeMnTe2 Driven by Spin’s Thermodynamic Entropy

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Research 2021年第1期2021卷 61-69页

作者： Sichen Duan Yinong Yin Guo-Qiang Liu Na man Jianfeng Cai Xiaojian Tan kai Guo Xinxin Yang Jun Jiang Ningbo Institute of Materials Technology and Engineering Chinese Academy of ScienceNingbo 315201China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049China

NaxCoO_(2)was known 20 years ago as a unique example in which spin entropy dominates the thermoelectric ***,however,little has been learned about how to manipulate the spin degree of freedom in ***,we report the enhanced thermoelectric performance of GeMnTe_(2)by controlling the spin’s thermodynamic *** anomalously large thermopower of GeMnTe_(2)is demonstrated to originate from the disordering of spin orientation under finite *** on the careful analysis of Heisenberg model,it is indicated that the spin-system entropy can be tuned by modifying the hybridization between Te-p and Mn-d *** a consequent strategy,Se doping enlarges the thermopower effectively,while neither carrier concentration nor band gap is *** measurement of magnetic susceptibility provides a solid evidence for the inherent relationship between the spin’s thermodynamic entropy and *** further introducing Bi doing,the maximum ZT in Ge_(0.94)Bi_(0.06)MnTe_(1.94)Se_(0.06)reaches 1.4 at 840 K,which is 45%higher than the previous report of Bi-doped GeMnTe_(2).This work reveals the high thermoelectric performance of GeMnTe_(2)and also provides an insightful understanding of the spin degree of freedom in thermoelectrics.

关键词： temperature entropy thermodynamic

Inhibitory effect of different Dendrobium species on LPS-induced inflammation in macrophages via suppression of MAPK pathways

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Chinese Journal of Natural Medicines 2018年第7期16卷 481-489页

作者： ZENG Qiang Chun-Hay Ko Wing-Sum siu LI kai-kai Chun-Wai Wong HAN Xiao-Qiang YANG Liu Clara Bik-San Lau HU Jiang-Miao Ping-Chung Leung Institute of Chinese Medicine The Chinese University of Hong Kong State Key Laboratory of Phytochemistry and Plant Resources in West China The Chinese University of Hong Kong Shenzhen Research Institute The Chinese University of Hong Kong Kunming Institute of Botany Chinese Academy of Sciences

Dendrobii Caulis(DC), named ‘Shihu' in Chinese, is a precious herb in traditional Chinese medicine. It is widely used to nourish stomach, enhance body fluid production, tonify "Yin" and reduce heat. More than thirty Dendrobium species are used as folk medicine. Some compounds from DC exhibit inhibitory effects on macrophage inflammation. In the present study, we compared the anti-inflammatory effects among eight Dendrobium species. The results provided evidences to support Dendrobium as folk medicine, which exerted its medicinal function partially by its inhibitory effects on inflammation. To investigate the anti-inflammatory effect of Dendrobium species, mouse macrophage cell line RAW264.7 was activated by lipopolysaccharide. The nitric oxide(NO) level was measured using Griess reagent while the pro-inflammatory cytokines were tested by ELISA. The protein expressions of inducible NO synthase(iNOS), cyclooxygenase-2(COX-2) and mitogen-activated protein kinases(MAPKs) phosphorylation were evaluated by Western blotting analysis. Among the eight Dendrobium species, both water extracts of D. thyrsiflorum ***(DTW) and D. chrysotoxum Lindl(DCHW) showed most significant inhibitory effects on NO production in a concentration-dependent manner. DTW also significantly reduced TNF-α, MCP-1, and IL-6 production. Further investigations showed that DTW suppressed iNOS and COX-2 expression as well as ERK and JNK phosphorylation, suggesting that the inhibitory effects of DTW on LPS-induced macrophage inflammation was through the suppression of MAPK pathways. In conclusion, D. thyrsiflorum *** was demonstrated to have potential to be used as alternative or adjuvant therapy for inflammation.

关键词： Dendrobium species Anti-inflammation Macrophage MAPK pathways