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Nucleation and Blunting of Nanocracks in Brass

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Journal of Materials Science & Technology 1998年第3期14卷 273-276页

作者： Gu, Biao Chu, Wuyang Qiao, Lijie Chen, Qizhi hsiao, Chimei Univ Sci & Technol Beijing Dept Mat Phys Beijing 100083 Peoples R China

In situ tensile test of brass foil specimens in TEM showed that many dislocations were emitted from a loaded crack tip, and a dislocation free zone (DFZ) was formed under the condition of constant displacement. The DFZ is an elastic zone, where the stress may equal to the cohesive strength sigma //t//h when the applied stress is high enough. As a result, nano-cracks would initiate discontinuously in the DFZ or, sometimes, at a blunted-crack tip. As soon as the nano-crack nucleated, it quickly blunts into a void, which results in ductile fracture. (Edited author abstract) 10 Refs.

关键词： Brass

Addressing dynamic photovoltaic processes at electrode:active layer and donor:acceptor interfaces in organic solar cells under device-operating conditions

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Science China Chemistry 2015年第2期58卷 239-247页

作者： Yu-Che hsiao Ting Wu Huidong Zang Mingxing Li Bin Hu Institute of Optoelectronic Technology Beijing Jiaotong University Department of Materials Science and Engineering University of Tennessee Center for Functional Nanomaterials Brookhaven National Laboratory

This article presents our experimental studies to unravel the dynamic photovoltaic processes occurring at donor:acceptor(D:A)and electrode:active layer(E:A)interfaces under device-operating conditions by using two unique magneto-optical measurements,namely photo-induced capacitance and magnetic field effect ***,we have found that a higher surface polarization of dielectric thin film can decrease the surface charge accumulation at E:A *** photo-induced capacitance results indicate that dielectric thin film plays a crucial role in the charge collection in generating photocurrent in organic solar ***,our experimental results from magnetic field effect show that the binding energies of charge transfer(CT)states at D:A interface can be evaluated by using the critical bias required to completely dissociate the CT *** is the first experimental demonstration that the binding energies of CT states can be measured under deviceoperating ***,we use our measurement of magnetic field effect to investigate the most popular organic photovoltaic solar cells,organometal halide perovskite photovoltaic *** results of magneto-photoluminescence show that the photogenerated electrons and holes are inevitably recombined into electron–hole pairs through a spin-dependent process in the ***,using spin polarizations can present a new design to control the photovoltaic loss in perovskites-based photovoltaic ***,we found that introducing D:A interface can largely affect the bulk charge dissociation and recombination in perovskite solar *** indicates that the interfacial and bulk photovoltaic processes are internally coupled in developing photovoltaic actions in perovskite ***,these magneto-optical measurements show a great potential to unravel the deeper photovoltaic processes occurring at D:A and E:A interfaces in both organic bulk-heterojunction and perovskite solar cells under dev

关键词： electrode interface donor-acceptor interface dielectric layer charge transfer states

Tough,conductive hydrogels with double-network based on hydrophilic polymer assistant well-dispersed carbon nanotube for innovative force sensor

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Science China(Technological Sciences) 2022年第5期65卷 1160-1168页

作者： CHEN GuoYin GUO Ying hsiao S.Benjamin HOU Kai ZHU MeiFang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Department of Chemistry Stony Brook UniversityNew York11794USA

In recent years,conductive hydrogels have become a promising candidate for application in fields such as tissue engineering and flexible electronic devices because of their conductivity,soft and wet ***,the preparation of tough and uniformly conductive hydrogels remains challenging because conductive nanofillers tend to aggregate during hydrogel ***,a hydrophilic polymer assistant dispersion strategy is proposed to fabricate a tough,conductive composite hydrogel with doublenetwork based on well-dispersed carbon nanotubes(CNTs).In particular,A@T_(2.0)/polyacrylamide(PAM)hydrogels showed a tensile strength of 332.9 kPa,elongation of 584.6%,Young’s modulus of 91.5 kPa,and conductivity of 2.765 S m^(-1),and a demonstration was performed to show the strain sensing for health monitoring and *** showed that the fabricated conductive hydrogels offer promising and broad insights in the field of wearable sensors for health monitoring,innovative electronics,and human-machine interactions.

关键词： alginate carbon nanotubes conductive hydrogel tough force sensing

Impulse response of Ge2Sb2Te5-based ultrafast photodetector integrated with SOI waveguide

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Chinese Optics Letters 2019年第10期17卷 93-96页

作者： Vibhu Srivastava Prateek Mishra sunny Indian Institute of Information Technology-Allahabad

The impulse response for a phase-change material Ge2Sb2Te5(GST)-based photodetector integrated with a silicon-on-insulator(SOI)waveguide is simulated using finite difference time domain *** current is calculated by solving the drift-diffusion model for short pulse(?10 fs)excitation for both of the stable *** width at half-maximum values of less than 1 ps are found in the *** crystalline GST has higher 3 dB bandwidth than the amorphous GST at a 1550 nm wavelength with responsivities of 21 A/W and 18.5 A/W,respectively,for a 150 nm thick GST layer biased at 2 V.A broad spectrum can be utilized by tuning the device using the phase-change property of material in the near infrared region.

关键词： waveguide SOI tuning

Studies on the sound absorption and transmission loss performances of wood-based, natural and wastematerials

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Acta Mechanica Sinica 2021年第5期37卷 861-873,I0003页

作者： hsiao Mun Lee Wensheng Luo Jinlong Xie Guilin Wen Heow Pueh Lee Center for Research on Leading Technology of Special Equipment School of Mechanical and Electrical EngineeringGuangzhou UniversityGuangzhou 510006China School of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou 510006China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

The sound absorption and sound transmission loss performances of the natural woods,hard and soft processed woods with attachment of the various natural orwastematerials were investigated in the present study using impedance tube with American Society for Testing Material(ASTM)*** sound absorption performances of all natural and all hard processed woods were very *** was found that filter mat made by the coconut fibre was the best material for sound absorption improvement of the hard processed *** sound absorption performance of the soft processed wood(cork)was better than all natural and all hard processed *** all tested woods,it was found that the cork with attached tea bag made by corn fibre is the best selection for sound absorption *** transmission loss performances of all natural woods were *** effects of various materials on the transmission loss performances of all hard processed woods were not very *** cork with and without attachment of various materials,their transmission loss performances were not as good as the hard processed *** all tested woods,it was found that Pterocarpus soyauxii and Quercus spp.(natural woods)are the best woods to be used in those applications when prevention of sound transmission is *** is recommended that cork is the best wood to be used in those applications where sound absorption and prevention of sound transmission are needed at the same time due to its good sound absorption performance while its ability on prevention of the sound transmission is also acceptable.

关键词： Sound absorption Transmission loss Wood-based material Natural material Waste material

EXPERIMENTAL AND NUMERICAL INVESTIGATION OF BUBBLE AUGMENTED WATERJET PROPULSION

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Journal of Hydrodynamics 2012年第5期24卷 635-647页

作者： CHOI Jin-Keun SINGH Sowmitra hsiao Chao-Tsung CHAHINE Georges L DYNAFLOW INC. JessupMarylandUSA

This contribution presents experimental and numerical investigations of the concept jet propulsion augmentation using bubble injection. A half-3D （D-shaped cylindrical configuration to enable optimal visualizations） divergent-convergent nozzle was designed, built, and used for extensive experiments under different air injection conditions and thrust measurement schemes. The design, optimization, and analysis were conducted using numerical simulations. The more advanced model was based on a two-way coupling between an Eulerian description of the flow field and a Lagrangian tracking of the injected bubbles using our Surface Averaged Pressure （SAP） model. The numerical results compare very favorably with nozzle experiments and both experiments and simulations validation the thrust augmentation concept. For a properly designed nozzle and air injection system, air injection produces net thrust augmentation, which increases with the rate of bubble injection. Doubling of thrust was measured for a 50% air injection rate. This beneficial effect remains at 50% after account for liquid pump additional work to overcome increased pressure by air injection.

关键词： waterjet propulsion bubble dynamics multi-phase flow

Diabetes and gastric cancer: The potential links

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World Journal of Gastroenterology 2014年第7期20卷 1701-1711页

作者： Chin-hsiao Tseng Farn-Hsuan Tseng Department of Internal Medicine National Taiwan University College of Medicine Division of Endocrinology and Metabolism Department of Internal MedicineNational Taiwan University Hospital Dana and David Dornsife College of Letters Arts and SciencesDepartment of Biological SciencesUniversity of Southern CaliforniaLos AngelesCA 90007United States

This article reviews the epidemiological evidence linking diabetes and gastric cancer and discusses some of the potential mechanisms,confounders and biases in the evaluation of such an *** from four meta-analyses published from 2011 to 2013 suggest a positive link,which may be more remarkable in females and in the Asian *** mechanisms may involve shared risk factors,hyperglycemia,Helicobacter pylori(***)infection,high salt intake,medications and *** may increase the risk of gastric cancer through shared risk factors including obesity,insulin resistance,hyperinsulinemia and ***,even before the clinical diagnosis of diabetes,may predict gastric cancer in some epidemiological studies,which is supported by in vitro,and in vivo *** with diabetes may also have a higher risk of gastric cancer through the higher infection rate,lower eradication rate and higher reinfection rate of *** salt intake can act synergistically with *** infection in the induction of gastric *** a higher risk of gastric cancer in patients with diabetes may be ascribed to a higher intake of salt due to the loss of taste sensation awaits further *** use of medications such as insulin,metformin,sulfonylureas,aspirin,statins and antibiotics may also influence the risk of gastric cancer,but most of them have not been extensively *** may affect the development of gastric cancer through the use of medications and changes in lifestyle,dietary intake,and the metabolism of ***,a potential detection bias related to gastrointestinal symptoms more commonly seen in patients with diabetes and with multiple comorbidities should be pointed *** into account the inconsistent findings and the potential confounders and detection bias in previous epidemiological studies,it is expected that there are still more to be explored for the clarification of the associa

关键词： Diabetes mellitus Gastric cancer Epidemiology Meta-analysis Literature review

Strategies for scalable symbolic execution-driven test generation for programs

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Science China(Information Sciences) 2011年第9期54卷 1797-1812页

作者： KRISHNAMOORTHY Saparya hsiao Michael S. LINGAPPAN Loganathan Intel Corporation Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

With the advent of advanced program analysis and constraint solving techniques,several test generation tools use variants of symbolic *** techniques have been shown to be very effective in path-based test generation;however,they fail to scale to large programs due to the exponential number of paths to be *** this paper,we focus on tackling this path explosion problem and propose search strategies to achieve quick branch coverage under symbolic execution,while exploring only a fraction of paths in the *** present a reachability-guided strategy that makes use of the reachability graph of the program to explore unvisited portions of the program and a conflict-driven backtracking strategy that utilizes conflict analysis to perform nonchronological *** present experimental evidence that these strategies can significantly reduce the search space and improve the speed of test generation for programs.

关键词： test generation software testing symbolic execution path explosion conflict analysis

Simulating bed evolution following the Barlin Dam(Taiwan,China)failure with implications for sediment dynamics modeling of dam removal

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International Journal of Sediment Research 2016年第4期31卷 299-310页

作者： hsiao-Wen Wang Desiree Tullos Wei-Cheng Kuo Department of Hydraulic and Ocean Engineering National Cheng Kung University Department of Biological and Ecological Engineering Oregon State University

The failure of the Barlin Dam in Taiwan,China offers an important case study for evaluating concepts in modeling the rapid erosion and channel recovery following intentional and unplanned dam *** present a modeling effort that applied a 1D and quasi-2D uncoupled hydraulics and sediment model(NETSTARS) to evaluate how discretization and parameterization influence thefitofbed elevationpredictions to observations following dam *** analysis evaluated the model sensitivity to sediment transport function,active layer thickness,and number of stream tubes used to define the *** indicate that a) the model is more sensitive to active layer thickness and sediment transport function than to the number of stream tubes,b) development of dam removal models are likely to benefit from varying the active layer thickness in time,and c) increased lateral discretization does not appear to improve model fit in the steep and rapidly changing river environment at our *** conclude with discussion on differences between,identifying the need for,and general use of 1D,quasi-2D,and fully 2D models in dam removal and failure analysis.

关键词： Dam removal Modeling Sediment dynamics Channel evolution Taiwan,China