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45 results on '"Yan, Yanfei"'

1. Wind Driven Semiconductor Electricity Generator With High Direct Current Output Based On a Dynamic Schottky Junction

Author

Yu, Xutao, Zheng, Haonan, Lu, Yanghua, Si, Jiaqi, Shen, Runjiang, Yan, Yanfei, Hao, Zhenzhen, and Lin, Shisheng

Subjects
Physics - Applied Physics
Abstract

As the fast development of internet of things (IoTs), distributed sensors have been frequently used and the small and portable power sources are highly demanded. However, the present portable power source such as lithium battery has low capacity and need to be replaced or recharged frequently. A portable power source which can continuously generate electrical power in situ will be an idea solution. Herein, we demonstrate a wind driven semiconductor electricity generator based on a dynamic Schottky junction, which can output a continuous direct current with an average value of 4.4 mA (the maximum value of 8.4 mA) over 360 seconds. Compared with the previous metal/semiconductor generator, the output current is one thousand times higher. Furthermore, this wind driven generator has been explored to function as a turn counter due to its stable output and also to drive a graphene ultraviolet photodetector, which shows a responsivity of 35.8 A/W under the 365 nm ultraviolet light. Our research provides a feasible method to achieve wind power generation and power supply for distributed sensors in the future.

Published
2020

2. Direct-Current Generator Based on Dynamic Water-Semiconductor Junction with Polarized Water as Moving Dielectric Medium

Author

Lu, Yanghua, Yan, Yanfei, Yu, Xutao, Zhou, Xu, Feng, Sirui, Xu, Chi, Zheng, Haonan, Yang, Zunshan, Li, Linjun, Liu, Kaihui, and Lin, Shisheng

Subjects
Physics - Applied Physics
Abstract

There is a rising prospective in harvesting energy from water droplets, as microscale energy is required for the distributed sensors in the interconnected human society. However, achieving a sustainable direct-current generating device from water flow is rarely reported, and the quantum polarization principle of the water molecular remains uncovered. Herein, we propose a dynamic water-semiconductor junction with moving water sandwiched between two semiconductors as a moving dielectric medium, which outputs a sustainable direct-current voltage of 0.3 V and current of 0.64 uA with low internal resistance of 390 kilohm. The sustainable direct-current electricity is originating from the dynamic water polarization process in water-semiconductor junction, in which water molecules are continuously polarized and depolarized driven by the mechanical force and Fermi level difference, during the movement of the water on silicon. We further demonstrated an encapsulated portable power-generating device with simple structure and continuous direct-current voltage, which exhibits its promising potential application in the field of wearable electronic generators.

Published
2020
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3. DC electricity generation from dynamic polarized water-semiconductor interface

Author

Yan, Yanfei, Zhou, Xu, Feng, Sirui, Lu, Yanghua, Qian, Jianhao, Zhang, Panpan, Yu, Xutao, Zheng, Yujie, Wang, Fengchao, Liu, Kaihui, and Lin, Shisheng

Subjects
Physics - Applied Physics
Abstract

Liquid electricity generator and hydrovoltaic technology have received numerous attentions, which can be divided into horizontal movement generator and vertical movement generator. The horizontal movement generator is limited for powering the integrated and miniaturized energy chip as the current output direction is depending on the moving direction of the water droplet, which means a sustainable and continuous direct-current (DC) electricity output can be hardly achieved because of the film of limited length. On the other hand, the existing vertical movement generators include triboelectricity or humidity gradient-based liquid electricity generator, where the liquid or water resource must be sustainably supplied to ensure continuous current output. Herein, we have designed an integratable vertical generator by sandwiching water droplets with semiconductor and metal, such as graphene or aluminum. This generator, named as polarized liquid molecular generator (PLMG), directly converts the lateral kinetic energy of water droplet into vertical DC electricity with an output voltage of up to ~1.0 V from the dynamic water-semiconductor interface. The fundamental discovery of PLMG is related to the non-symmetric structure of liquid molecules, such as water and alcohols, which can be polarized under the guidance of built-in field caused by the Fermi level difference between metal and semiconductor, while the symmetric liquid molecules cannot produce any electricity on the opposite. Integratable PLMG with a large output power of ~90 nW and voltage of ~2.7 V has been demonstrated, meanwhile its small internal resistance of ~250 kilohm takes a huge advantage in resistance matching with the impedance of electron components. The PLMG shows potential application value in the Internet of Things (IoTs) after proper miniaturization and integration.

Published
2020
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4. Direct-Current Generator Based on Moving Van der Waals Schottky Diode

Author

Lin, Shisheng, Lu, Yanghua, Feng, Sirui, Hao, Zhenzhen, and Yan, Yanfei

Subjects
Physics - Applied Physics
Abstract

Traditionally, Schottky diodes are used statically in the electronic information industry but dynamic state Schottky diodes based applications have been rarely explored. Herein, a novel Schottky diode named moving Schottky diode generator has been designed, which can convert mechanical energy into electrical energy with voltage output as high as 0.6V, by means of lateral movement between graphene/metal film and semiconductor, where the semiconductor can be non-piezoelectric materials. The mechanism is based on the built-in electric field separation of drifting electrons in moving van der Waals Schottky diode. The power output can be further increased in future through optimizing the Schottky diode. The graphene film/silicon moving van der Waals Schottky diode based generator behaves better stability. This direct-current generator has the potential of converting mechanical efficiently and vibrational energy into electricity and enables many promising applications.

Published
2018
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5. Straw Return or No Tillage? Comprehensive Meta-Analysis Based on Soil Organic Carbon Contents, Carbon Emissions, and Crop Yields in China.

Author

Yan, Yanfei, Li, Haoyu, Zhang, Min, Liu, Xiwei, Zhang, Lingxin, Wang, Yaokuo, Yang, Min, and Cai, Ruiguo

Subjects
*CARBON in soils, *CROP yields, *CARBON emissions, *TILLAGE, *LOW temperatures, *CONSERVATION tillage
Abstract

Conservation tillage methods, including straw return (SR) and no tillage (NT), are widely used to improve the soil organic carbon (SOC) content and crop yield. However, applying SR or NT separately has become a common practice for farmers producing different crops or those in different regions. Evaluating the effects of SR or NT on the SOC content, carbon emissions, and crop yield are important for guiding the correct application of conservation tillage and promoting sustainable agricultural development. Therefore, we conducted a meta-analysis based on 1014 sets of data obtained in China to assess the effects of SR and NT on the SOC content, carbon emissions, and crop yield. Compared with no straw return, SR increased the SOC content and crop yield by 10% and 8.6%, respectively, but with no significant impact on carbon emissions. Compared with conventional tillage, NT increased the SOC content by 2.9% and reduced the carbon emissions and crop yield by 18% and 3.9%, respectively. We also found that SR combined with NT had an additive effect, where the combination improved SOC more than applying SR or NT alone. If applying SR or NT alone, the specific climatic conditions, soil characteristics, and field management strategies need to be considered to maximize SOC. In particular, SR should be used in limited hydrothermal conditions (low temperature or low precipitation) and areas where rice–wheat rotation is implemented. NT can be used under any climate conditions, but it can effectively increase the SOC content in continuous wheat cropping areas. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Achieving Secrecy Capacity of the Gaussian Wiretap Channel with Polar Lattices

Author

Liu, Ling, Yan, Yanfei, and Ling, Cong

Subjects
Computer Science - Information Theory
Abstract

In this work, an explicit wiretap coding scheme based on polar lattices is proposed to achieve the secrecy capacity of the additive white Gaussian noise (AWGN) wiretap channel. Firstly, polar lattices are used to construct secrecy-good lattices for the mod-$\Lambda_s$ Gaussian wiretap channel. Then we propose an explicit shaping scheme to remove this mod-$\Lambda_s$ front end and extend polar lattices to the genuine Gaussian wiretap channel. The shaping technique is based on the lattice Gaussian distribution, which leads to a binary asymmetric channel at each level for the multilevel lattice codes. By employing the asymmetric polar coding technique, we construct an AWGN-good lattice and a secrecy-good lattice with optimal shaping simultaneously. As a result, the encoding complexity for the sender and the decoding complexity for the legitimate receiver are both O(N logN log(logN)). The proposed scheme is proven to be semantically secure., Comment: Submitted to IEEE Trans. Information Theory, revised. This is the authors' own version of the paper

Published
2015

8. Construction of Capacity-Achieving Lattice Codes: Polar Lattices

Author

Liu, Ling, Yan, Yanfei, Ling, Cong, and Wu, Xiaofu

Subjects
Computer Science - Information Theory
Abstract

In this paper, we propose a new class of lattices constructed from polar codes, namely polar lattices, to achieve the capacity $\frac{1}{2}\log(1+\SNR)$ of the additive white Gaussian-noise (AWGN) channel. Our construction follows the multilevel approach of Forney \textit{et al.}, where we construct a capacity-achieving polar code on each level. The component polar codes are shown to be naturally nested, thereby fulfilling the requirement of the multilevel lattice construction. We prove that polar lattices are \emph{AWGN-good}. Furthermore, using the technique of source polarization, we propose discrete Gaussian shaping over the polar lattice to satisfy the power constraint. Both the construction and shaping are explicit, and the overall complexity of encoding and decoding is $O(N\log N)$ for any fixed target error probability., Comment: full version of the paper to appear in IEEE Trans. Communications

Published
2014

15. Numerical Study of Convective and Radiation Heat Transfer Characteristics in an Upward-Facing Cylindrical Cavity under Back-Side Windy Condition

Author

Sun Hao, Guan Jingyu, Ying Huang, Yan Yanfei, Qiang Yu, Liangwei Xia, Zehui Wang, Ti Wang, Guohua Wei, and Kefeng Wu

Subjects
Physics, Convection, Convective heat transfer, Computer simulation, Astrophysics::High Energy Astrophysical Phenomena, 020209 energy, Physics::Optics, 02 engineering and technology, Mechanics, Condensed Matter Physics, Declination, Nusselt number, Wind speed, 020303 mechanical engineering & transports, Tilt (optics), 0203 mechanical engineering, Physics::Space Physics, Heat transfer, 0202 electrical engineering, electronic engineering, information engineering, Astrophysics::Solar and Stellar Astrophysics, Physics::Atmospheric and Oceanic Physics
Abstract

Under the back-side windy condition, the convection and radiation heat transfer characteristics in an iso-flux upward-facing cylindrical cavity were studied by three-dimensional numerical simulation. The impacts of cavity tilt angle, wind incident angle and wind speed on convection and radiation heat transfer Nusselt number Nuc and Nur were analyzed, and the possible explanations for their impacts were presented. Results show that due to the disturbance of wind, the influence of cavity tilt angle becomes more complicated and is related to wind incident angle and wind speed. The variation of Nuc or Nur with wind incident angle is different for different cavity tilt angles. Despite of the changes of cavity tilt angle or wind incident angle, the Nuc increases with the wind speed while the Nur presents a declination with the increasing of wind speed. Hence, compared with cavity tilt angle and wind incident angle, wind speed may be the dominant factor affecting or controlling the convective and radiation heat transfer of cavity.

Published
2020

16. Experimental Investigation for Co-Combustion Characteristics of Semi-Coke and Bituminous Coal in a 3 MWth Tangential Combustion Facility

Author

Song Xin, Rui Sun, Guan Jingyu, Yan Yanfei, Minghao Wang, Qiang Yu, and Tao Shen

Subjects
Bituminous coal, Materials science, 020209 energy, geology.rock_type, Metallurgy, geology, Autoignition temperature, 02 engineering and technology, Coke, Condensed Matter Physics, Combustion, 020303 mechanical engineering & transports, 0203 mechanical engineering, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Gravimetric analysis, Furnace temperature, Thermal analysis
Abstract

An experimental investigation was conducted in a 3 MW pilot-scale tangential combustion facility to explore the co-combustion characteristics of bituminous coal mixed with semi-coke. The thermal gravimetric analyzer (TGA) was used to obtained fuel thermal analysis. The results presented effects of semi-coke blending ratio (BR) on average furnace temperature, ignition temperature, NO emission and combustion efficiency. The excess air coefficient in main combustion sections and outlet were fixed at 0.85 and 1.2 while BR increased from 0% to 50 wt%. The temperature profiles of combustion decreases along the height of furnace while average furnace temperature fluctuates slightly with an increasing BR. The concentration of NO has an increasing tendency with the increasing of BR. The ignition temperature obtained from TGA measurement agreed well with experiment result. In addition, combustion efficiency was not sensitive to BR and decreased slightly with the increasing BR.

Published
2020

17. High Efficient Solar Cell Based on Heterostructure Constructed by Graphene and GaAs Quantum Wells.

Author

Yu, Xutao, Dai, Yue, Lu, Yanghua, Liu, Chang, Yan, Yanfei, Shen, Runjiang, Yang, Zunshan, Feng, Lixuan, Sun, Lijie, Liu, Yong, and Lin, Shisheng

Subjects
SOLAR cells, GRAPHENE, QUANTUM wells, AUDITING standards, INDIUM gallium arsenide, OPEN-circuit voltage, GALLIUM arsenide
Abstract

Despite the fascinating optoelectronic properties of graphene, the power conversion efficiency (PCE) of graphene based solar cells remains to be lifted up. Herein, it is experimentally shown that the graphene/quantum wells/GaAs heterostructure solar cell can reach a PCE of 20.2% and an open‐circuit voltage (Voc) as high as 1.16 V at 90 K. The high efficiency is a result of carrier multiplication (CM) effect of graphene in the graphene/GaAs heterostructure. Especially, the external quantum efficiency (EQE) in the ultraviolet wavelength can be improved up to 72.2% based on the heterostructure constructed by graphene/In0.15Ga0.85As/GaAs0.75P0.25 quantum wells/GaAs. The EQE increases as the light wavelength decreases, which indicates more carriers can be effectively excited by the higher energy photons through CM effect. Owing to these physical characters, the graphene/GaAs heterostructure solar cell will provide a possible way to exceed Shockley–Queisser (S–Q) limit. [ABSTRACT FROM AUTHOR]

Published
2023
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18. Genomic characterization of conjugative plasmids carrying the mcr-1 gene in foodborne and clinical strains of Salmonella and Escherichia coli

Author

Li, Wei, primary, Yan, Yanfei, additional, Chen, Jia, additional, Sun, Ruiwen, additional, Wang, Yuxuan, additional, Wang, Tingfen, additional, Feng, Zitian, additional, Peng, Kai, additional, Wang, Juan, additional, Chen, Sheng, additional, Luo, Yanping, additional, Li, Ruichao, additional, and Yang, Baowei, additional

Published
2021
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20. Co-combustion kinetics characteristics of semi-coke and bituminous coal under a drop tube furnace

Author

Guan, Jingyu, primary, Yu, Qiang, additional, Sun, Rui, additional, Huang, Ying, additional, Sun, Hao, additional, Wei, Guohua, additional, Wang, Jingjie, additional, Ma, Xiaochun, additional, Bai, Zongqing, additional, Zuo, Guohua, additional, Wang, Xiaopeng, additional, Li, Wei, additional, Wang, Minghao, additional, and Yan, Yanfei, additional

Published
2021
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27. Co-combustion kinetics characteristics of semi-coke and bituminous coal under a drop tube furnace

Author

Rui Sun, Guan Jingyu, Zongqing Bai, Jingjie Wang, Wang Minghao, Zuo Guohua, Sun Hao, Xiaochun Ma, Wei Li, Yan Yanfei, Guohua Wei, Qiang Yu, Wang Xiaopeng, and Ying Huang

Subjects
Bituminous coal, Combustion kinetics, Materials science, Metallurgy, geology.rock_type, geology, Coke, Tube furnace
Abstract

Random pore model was employed to calculate the reaction kinetics parameters of SH bituminous coal and Shenmu semi-coke blended fuels under high-temperature entrained flow combustion, and the reaction kinetics parameters was modified by the intrinsic reaction Arrhenius curve obtained from low temperature thermogravimetric experiments. Then the combustion reaction rate and intrinsic reaction order at different blending ratios of semi-coke were determined. The reaction kinetics parameters and carbon conversion rate of blended fuels were investigated based on the pore structure of fuel, the effects of blending ratio of semi-coke, initial partial pressure of oxygen and reaction temperature. The reaction order decreases with the increasing of semi-coke blended ratio except 100% semi-coke combustion has higher reaction order approximately as char pure burning. The distribution of oxygen alone the radius of particle was also calculated in this study. In the low oxygen reduction zone, the blending ratio of semi-coke has little effect on the carbon conversion of blended fuel, and the blending effect is enhanced with the increasing of oxygen content. Carbon conversion rate decreases with the increasing of blending ratio and increases with reaction temperature.

Published
2021

28. Steady combustion test and numerical simulation analysis of a single direct-flow pulverized coal burner at low load

Author

Song Xin, Han Shengli, Shen Tao, Xu Yanhui, Huang Ying, Xia Liangwei, Zhu Lingkun, Shu Zhenyang, Yu Qiang, Wang Jingjie, Yan Yanfei, Wang Minghao, and Guohua Wei

Subjects
Pulverized coal-fired boiler, Computer simulation, Nuclear engineering, Combustor, Environmental science, Low load, Combustion, Direct flow
Abstract

In this paper, the low load steady combustion test of a single burner was carried out on the 30MW thermal test bench of the State Key Laboratory of efficient and clean coal-fired power plant boiler. Combined with numerical simulation, the lower limit of the minimum stable combustion load of the burner was tried to find out, which provided the basic test data for the furnace combustion stability during the deep peak load regulation of the boiler. The experimental and numerical simulation results show that under 40% rated load, the outlet flame is stable and bright, and the negative pressure in the furnace is stable, which can realize the stable combustion of a single burner.

Published
2021

29. Mathematical modelling and operation parameters analysis of proton exchange membrane fuel cell

Author

Qiang Yu, Wang Yupeng, Yan Yanfei, Lingkun Zhu, Jingyu Guan, and Ying Huang

Subjects
Materials science, Chemical engineering, Proton exchange membrane fuel cell
Abstract

The fuel cell is a device which can convert chemical energy from fuel into electrical and thermal energy directly. It has advantages like high power density, fast start-up and high conversion efficiency. Its prospects of application in transportation, fixed power supply and standby power generation are great. Fuel cell is a dynamic complex system with multi-phase, multi-scale and multi-physical fields. Based on the working mechanism of fuel cell, this paper establishes a mathematical model to simulate the electrochemical reaction, material and energy transfer process in fuel cell. The parameters such as temperature, pressure, concentration, current and potential, which are difficult to measure, are visualized to deepen the transfer and counter-reaction in fuel cell. In order to provide important scientific basis for the optimal design and system control of the stack, the mechanism should be understood and the optimum reaction conditions should be found.

Published
2020

37. Design of AGV 3D Real-Time Simulation Control System Based on Wireless Network

Author

Yan Yanfei, Nie Qixuan, Sun Hui, Wang Manfei, and Yu Hongfei

Subjects
Automatic control, Wireless network, business.industry, Computer science, Real-time computing, Serial port, 02 engineering and technology, computer.software_genre, Simulation software, Software, Real-time simulation, Control system, 0202 electrical engineering, electronic engineering, information engineering, Wireless, 020201 artificial intelligence & image processing, business, computer
Abstract

For most of the AGV superior control system is planar two-dimensional, poor visibility and lack of equipment operating efficiency statistics, A three-dimensional AGV simulation control system based on wireless communication and Flexsim logistics simulation software is proposed.. Through the socket socket connection zigbee wireless transmission module serial port and Flexsim software completes the data communication between the processes, thus establishes AGV and Flexsim data communication. Build the 3D system simulation model of AGV and write the control algorithm through Flexsim. At the same time, call the SQL database data to complete the real-time simulation and analyze the running status in real time. Mainly studied the data communication interaction between the AGV wireless communication module and Flexsim, using the AGV of the college laboratory to conduct field tests. The results show that the design program basically achieves the expected functions and effects.

Published
2018

39. Comparative Study on Antibiotic Resistance and DNA Profiles of Salmonella entericaSerovar Typhimurium Isolated from Humans, Retail Foods, and the Environment in Shanghai, China

Author

Zhang, Zengfeng, Cao, Chenyang, Liu, Bin, Xu, Xuebin, Yan, Yanfei, Cui, Shenghui, Chen, Sheng, Meng, Jianghong, and Yang, Baowei

Abstract

AbstractWe characterized antibiotic resistance profiles, antibiotic resistance-associated genes, and pulsed-field gel electrophoresis (PFGE) patterns of 145 Salmonella entericaserotype Typhimurium isolates from human infections and retail foods that were possibly responsible for salmonellosis outbreaks from 2008 to 2012 in Shanghai, China. Resistance to at least three antibiotics was found in 66.7% of chicken isolates, 76.5% of duck isolates, 77.8% of pork isolates, and 80.5% of human isolates. Seven antibiotic resistance phenotypes were detected in chicken isolates, 16 in pork isolates, 17 in duck isolates, and 50 in human isolates. No significant difference (p> 0.05) was found between Salmonellaisolates derived from human salmonellosis and from retail foods in terms of the percent resistance of ampicillin, amoxicillin/clavulanic acid, ceftiofur, ceftriaxone, nalidixic acid, chloramphenicol, gentamicin, kanamycin, streptomycin, tetracycline, sulfisoxazole, and sulfamethoxazole/trimethoprim. PFGE using XbaI and BlnI showed that some Salmonellaisolates recovered from human infections and retail foods had same or highly similar genetic profile. Same or similar antibiotic resistance profiles, antibiotic resistance associated genes (i.e., qnrA, qnrB, qnrS, aac(6′)-Ib, and oqxAB), gene cassettes (i.e., aadA2, dfrA12-aadA2, and aadA1), and mutations were detected in those isolates that exhibited high genetic similarities. These findings highlighted the frequent presence of SalmonellaTyphimurium in retail chicken, pork, duck, and humans.

Published
2018
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40. Surface States Enhanced Dynamic Schottky Diode Generator with Extremely High Power Density Over 1000 W m−2.

Author

Lin, Shisheng, Shen, Runjiang, Yao, Tianyi, Lu, Yanghua, Feng, Sirui, Hao, Zhenzhen, Zheng, Haonan, Yan, Yanfei, and Li, Erping

Subjects
SCHOTTKY barrier diodes, ENERGY harvesting, ELECTRIC fields, SURFACE states, POWER density, MECHANICAL movements
Abstract

The overloaded energy cost has become the main concern of the now fast developing society, which make novel energy devices with high power density of critical importance to the sustainable development of human society. Herein, a dynamic Schottky diode based generator with ultrahigh power density of 1262.0 W m−2 for sliding Fe tip on rough p‐type silicon is reported. Intriguingly, the increased surface states after rough treatment lead to an extremely enhanced current density up to 2.7 × 105 A m−2, as the charged surface states can effectively accelerate the carriers through large atomic electric field, while the reflecting directions are regulated by the built‐in electric field of the Schottky barrier. This research provides an open avenue for utilizing the surface states in semiconductors in a subversive way, which can co‐utilize the atomic electric field and built‐in electric field to harvest energy from the mechanical movements, especially for achieving an ultrahigh current density power source. [ABSTRACT FROM AUTHOR]

Published
2019
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42. Surface States Enhanced Dynamic Schottky Diode Generator with Extremely High Power Density Over 1000 W m−2.

Author

Lin, Shisheng, Shen, Runjiang, Yao, Tianyi, Lu, Yanghua, Feng, Sirui, Hao, Zhenzhen, Zheng, Haonan, Yan, Yanfei, and Li, Erping

Subjects
*SCHOTTKY barrier diodes, *ENERGY harvesting, *ELECTRIC fields, *SURFACE states, *POWER density, *MECHANICAL movements
Abstract

The overloaded energy cost has become the main concern of the now fast developing society, which make novel energy devices with high power density of critical importance to the sustainable development of human society. Herein, a dynamic Schottky diode based generator with ultrahigh power density of 1262.0 W m−2 for sliding Fe tip on rough p‐type silicon is reported. Intriguingly, the increased surface states after rough treatment lead to an extremely enhanced current density up to 2.7 × 105 A m−2, as the charged surface states can effectively accelerate the carriers through large atomic electric field, while the reflecting directions are regulated by the built‐in electric field of the Schottky barrier. This research provides an open avenue for utilizing the surface states in semiconductors in a subversive way, which can co‐utilize the atomic electric field and built‐in electric field to harvest energy from the mechanical movements, especially for achieving an ultrahigh current density power source. [ABSTRACT FROM AUTHOR]

Published
2019
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43. Prevalence, antibiotic susceptibility, and genomic analysis of Vibrio alginolyticus isolated from seafood and freshwater products in China.

Author

Sun Y, Yan Y, Yan S, Li F, Li Y, Yan L, Yang D, Peng Z, Yang B, Sun J, Xu J, Dong Y, and Bai Y

Abstract

Introduction: This study characterized Vibrio alginolyticus isolated from seafood and freshwater products in China (2020)., Methods and Results: In total, 122 (95.31%) V. alginolyticus isolates were resistant to at least 1 antibiotic category, and 2 (1.56%) isolates were resistant to at least 3 antibiotic categories and belong to multi-drug resistance (MDR) isolates. A high prevalence rate was observed to be blaCARB (98.04%) encoding beta-lactam resistance, followed by tet (97.06%) encoding tetracycline resistance and fos (4.90%) encoding resistance to fosfomycin. Among the 57 V. alginolyticus isolates, the commonest virulence genes were type III secretion system translocated gene vopD , vopB , and vcrH (54.4%, 31/57), type III secretion system regulated gene tyeA (54.39%), followed by vscI and vscF (50.88%) encoded type III secretion system inner rod protein and needle protein, respectively. Multilocus sequence typing (MLST) showed considerable genetic diversity, with 34 distinct sequence types (STs) identified among 55 isolates. ST421 ( n  = 5), ST166 ( n  = 4), ST523 ( n  = 3), ST516 ( n  = 3), and ST507 ( n  = 3) were dominant STs among 55 V. alginolyticus isolates., Discussion: These findings highlight the widespread occurrence of V. alginolyticus in both freshwater and seafood products, underscoring the critical need for vigilant monitoring of these bacteria. Such measures are essential for ensuring effective food safety management and safeguarding public health., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Sun, Yan, Yan, Li, Li, Yan, Yang, Peng, Yang, Sun, Xu, Dong and Bai.)

Published
2024
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44. Surface States Enhanced Dynamic Schottky Diode Generator with Extremely High Power Density Over 1000 W m -2 .

Author

Lin S, Shen R, Yao T, Lu Y, Feng S, Hao Z, Zheng H, Yan Y, and Li E

Abstract

The overloaded energy cost has become the main concern of the now fast developing society, which make novel energy devices with high power density of critical importance to the sustainable development of human society. Herein, a dynamic Schottky diode based generator with ultrahigh power density of 1262.0 W m -2 for sliding Fe tip on rough p-type silicon is reported. Intriguingly, the increased surface states after rough treatment lead to an extremely enhanced current density up to 2.7 × 10 5 A m -2 , as the charged surface states can effectively accelerate the carriers through large atomic electric field, while the reflecting directions are regulated by the built-in electric field of the Schottky barrier. This research provides an open avenue for utilizing the surface states in semiconductors in a subversive way, which can co-utilize the atomic electric field and built-in electric field to harvest energy from the mechanical movements, especially for achieving an ultrahigh current density power source., Competing Interests: The authors declare no conflict of interest., (© 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2019
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45. Comparative Study on Antibiotic Resistance and DNA Profiles of Salmonella enterica Serovar Typhimurium Isolated from Humans, Retail Foods, and the Environment in Shanghai, China.

Author

Zhang Z, Cao C, Liu B, Xu X, Yan Y, Cui S, Chen S, Meng J, and Yang B

Subjects
Animals, Bacteriophage Typing, China epidemiology, DNA, Bacterial genetics, Electrophoresis, Gel, Pulsed-Field, Food Microbiology, Humans, Meat Products microbiology, Microbial Sensitivity Tests, Poultry microbiology, Salmonella Food Poisoning epidemiology, Salmonella Infections microbiology, Salmonella typhimurium classification, Serotyping, Anti-Bacterial Agents pharmacology, Drug Resistance, Multiple, Bacterial genetics, Food Contamination, Salmonella typhimurium isolation & purification
Abstract

We characterized antibiotic resistance profiles, antibiotic resistance-associated genes, and pulsed-field gel electrophoresis (PFGE) patterns of 145 Salmonella enterica serotype Typhimurium isolates from human infections and retail foods that were possibly responsible for salmonellosis outbreaks from 2008 to 2012 in Shanghai, China. Resistance to at least three antibiotics was found in 66.7% of chicken isolates, 76.5% of duck isolates, 77.8% of pork isolates, and 80.5% of human isolates. Seven antibiotic resistance phenotypes were detected in chicken isolates, 16 in pork isolates, 17 in duck isolates, and 50 in human isolates. No significant difference (p > 0.05) was found between Salmonella isolates derived from human salmonellosis and from retail foods in terms of the percent resistance of ampicillin, amoxicillin/clavulanic acid, ceftiofur, ceftriaxone, nalidixic acid, chloramphenicol, gentamicin, kanamycin, streptomycin, tetracycline, sulfisoxazole, and sulfamethoxazole/trimethoprim. PFGE using XbaI and BlnI showed that some Salmonella isolates recovered from human infections and retail foods had same or highly similar genetic profile. Same or similar antibiotic resistance profiles, antibiotic resistance associated genes (i.e., qnrA, qnrB, qnrS, aac(6')-Ib, and oqxAB), gene cassettes (i.e., aadA2, dfrA12-aadA2, and aadA1), and mutations were detected in those isolates that exhibited high genetic similarities. These findings highlighted the frequent presence of Salmonella Typhimurium in retail chicken, pork, duck, and humans.

Published
2018
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