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Plasma enhanced chemical vapor deposition of excellent a-Si:H passivation layers for a-Si:H/c-Si heterojunction

Lei ZHAO,Wenbin ZHANG,Jingwei CHEN,Hongwei DIAO,Qi WANG,Wenjing WANG

Frontiers in Energy 2017, Volume 11, Issue 1,   Pages 85-91 doi: 10.1007/s11708-016-0437-3

Abstract: The intrinsic a-Si:H passivation layer inserted between the doped a-Si:H layer and the c-Si substrateis very crucial for improving the performance of the a-Si:H/c-Si heterojunction (SHJ) solar cell.The passivation performance of the a-Si:H layer is strongly dependent on its microstructure.Usually, the compact a-Si:H deposited near the transition from the amorphous phase to the nanocrystallineIn this paper, intrinsic a-Si:H layers were prepared on n-type Cz c-Si substrates by 27.12 MHz PECVD

Keywords： PECVD     high pressure and high power     a-Si:H microstructure     passivation     heterojunction solar cell    

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Analysis of the double-layer α-Si:H emitter with different doping concentrations for α-Si:H/c-Si heterojunction

Haibin HUANG,Gangyu TIAN,Tao WANG,Chao GAO,Jiren YUAN,Zhihao YUE,Lang ZHOU

Frontiers in Energy 2017, Volume 11, Issue 1,   Pages 92-95 doi: 10.1007/s11708-016-0432-8

Abstract: doping concentrations (DLE) have been designed and prepared for amorphous silicon/crystalline silicon (α-Si:H/c-Si) heterojunction solar cells.

Keywords： double-layer emitter     α-Si:H/c-Si heterojunction solar cell     short circuit current     quantum efficiency     current-voltage-temperature    

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Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 203-213 doi: 10.1007/s11465-011-0131-4

Abstract:

Crack on a shaft is one of the common damages in a rotor system. In this paper, transverse vibrations are calculated to compare the influences of transverse crack and slant crack on the rotor system. Results show that the vibration amplitude of the rotor system with a 45° slant crack on the shaft is larger than that with a transverse crack when the two types of crack have the same depth and the rotor system runs in the same condition. Stability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft under torsional excitation are analyzed by considering opening and closing of the crack. It is shown that the instability of the transverse vibration of the rotor system increases with increasing difference between the bending stiffness in two main directions, and the vibration is stable when the two bending stiffness are identical. The spectrum analysis of the steady-state response reveals that the gravity and the eccentricity produce different frequency components, and when the two bending stiffness are identical, the multiple frequency components of the torsional excitation disappear. Further investigation shows that the vibration amplitudes in combined frequencies increase rapidly in transversal, torsional, and axial vibration with increasing slant crack depth. The results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack on a shaft and can be used for the detection of the slant crack on a shaft.

Keywords： rotor dynamics     slant crack     stability     torsional excitation     open and close    

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Mercury enrichment in

Chunhao Dai, Pufeng Qin, Zhangwei Wang, Jian Chen, Xianshan Zhang, Si Luo

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0892-z

Abstract: Mercury enrichment in response to elevated atmospheric mercury concentrations in the organs of rape ( ) was investigated. Elevated soil mercury content had significant impact on mercury accumulation in rape stems, roots, seeds and seed coats. Leaf mercury in the leaves was mostly affected by atmospheric input while the stems were mostly affected by soil concentrations. Mercury in the aboveground plant tissue mainly derived from atmospheric absorption, and atmospheric mercury absorption in leaves was higher than that in the stems. Mercury enrichment in response to elevated atmospheric mercury concentrations in the organs of rape ( ) was investigated using an open top chamber fumigation experiment and a soil mercury enriched cultivation experiment. Results indicate that the mercury concentration in leaves and stems showed a significant variation under different concentrations of mercury in atmospheric and soil experiments while the concentration of mercury in roots, seeds and seed coats showed no significant variation under different atmospheric mercury concentrations. Using the function relation established by the experiment, results for atmospheric mercury sources in rape field biomass showed that atmospheric sources accounted for at least 81.81% of mercury in rape leaves and 32.29% of mercury in the stems. Therefore, mercury in the aboveground biomass predominantly derives from the absorption of atmospheric mercury.

Keywords： Open top chamber     Gaseous elemental mercury (GEM)     Soil Mercury     Brassica napus    

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Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3,   Pages 450-456 doi: 10.1007/s11705-018-1735-6

Abstract:

Supramolecular assemblies (PS-b-P4VP(AzoR)) are fabricated by hydrogen-bonding azobenzene derivatives (AzoR) to poly(4-vinyl pyridine) blocks of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP). PS-b-P4VP(AzoR) forms phase separated nanostructures with a period of ~75–105 nm. A second length scale structure with a period of 2 µm is fabricated on phase separated PS-b-P4VP(AzoR) by laser interference ablation. Both the concentration and the substituent of AzoR in PS-b-P4VP(AzoR) affect the laser ablation process. The laser ablation threshold of PS-b-P4VP(AzoR) decreases as the concentration of AzoR increases. In PS-b-P4VP(AzoR) with different substituents (R= CN, H, and CH3), ablation thresholds follow the trend: PS-b-P4VP(AzoCN)<PS-b-P4VP(AzoCH3)<PS-b-P4VP(AzoH). This result indicates that the electron donor group (CH3) and the electron acceptor group (CN) can lower the ablation threshold of PS-b-P4VP(AzoR).

Keywords： laser ablation     block copolymers     hydrogen-bond     azobenzene derivatives     supramolecular assembly    

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Numerical simulation of charge stratifications to improve combustion and NO formation of lean-burn SI

Zhijun PENG ,

Frontiers in Energy 2009, Volume 3, Issue 3,   Pages 353-358 doi: 10.1007/s11708-009-0035-8

Abstract: The influences of charge stratification on spark ignition (SI) engine combustion and NO emission were

Keywords： charge stratification     SI engine     lean-burn combustion     NO emission    

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Ga(X)N/Si nanoarchitecture: An emerging semiconductor platform for sunlight-powered water splitting toward

Frontiers in Energy doi: 10.1007/s11708-023-0881-9

Abstract: Among various materials developed, Ga(X)N/Si (X = In, Ge, Mg, etc.) nanoarchitecture has emerged as apaper introduces the characteristics, properties, and growth/synthesis/fabrication methods of Ga(X)N/SiIn addition, it exclusively summarizes the recent progress and development of Ga(X)N/Si nanoarchitecturethe challenges and prospects of artificial photosynthesis integrated device and system using Ga(X)N/Si

Keywords： Ga(X)N/Si nanoarchitecture     artificial photosynthesis     water splitting     solar toward hydrogen    

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Si Micromachined Gyroscope Driven by the Rotating Carrier

Zhang Fuxue,Mao Xu,Zhang wei

Strategic Study of CAE 2006, Volume 8, Issue 8,   Pages 23-27

Abstract:

This paper reported a silicon micromachined gyroscope that is driven by the rotating carrier's angular velocity.The silicon chip was manufactured by anisotropy etching.The design，fabrication and packing of the sensing element were introduced. The angular velocity of the rotating carrier was measured by emulator. The simulation experiment and performance test have certificated that the principle of the gyroscope is correct and the gyroscope can be used to sense yawing or pitching angular velocity of the rotating carrier, and the angular velocity of the rotating carrier itself.

Keywords： Si     anisotropy etching     angular velocity     emulator    

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Impacts of cone-structured interface and aperiodicity on nanoscale thermal transport in Si/Ge superlattices

Pengfei JI, Yiming RONG, Yuwen ZHANG, Yong TANG

Frontiers in Energy 2018, Volume 12, Issue 1,   Pages 137-142 doi: 10.1007/s11708-018-0532-8

Abstract: Si/Ge superlattices are promising thermoelectric materials to convert thermal energy into electric powerThe nanoscale thermal transport in Si/Ge superlattices is investigated via molecular dynamics (MD) simulationThe impact of Si and Ge interface on the cross-plane thermal conductivity reduction in the Si/Ge superlatticesis studied by designing cone-structured interface and aperiodicity between the Si and Ge layers.The temperature difference between the left and right sides of the Si/Ge superlattices is set up for

Keywords： thermoelectric material     thermal transport     Si/Gesuperlattics     molecular dynamics (MD)    

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Fabrication of Si-based three-dimensional microbatteries: A review

Chuang YUE, Jing LI, Liwei LIN

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 4,   Pages 459-476 doi: 10.1007/s11465-017-0462-x

Abstract:

High-performance, Si-based three-dimensional (3D) microbattery systems for powering micro/nano-electromechanicalIn this review, Si-based 3D microbatteries and related fabrication technologies, especially the production

Keywords： three-dimensional (3D)     wafer-scale     Si-based anode     micro-LIBs     thin-film deposition    

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LC/MS/MS and radioisotope method combined for recognizing the affinity between catalpol and OCT2 transporter

Zhiyu ZHANG, Changxiao LIU, Duanyun SI, Rong LU, Xiulin YI

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4,   Pages 436-442 doi: 10.1007/s11705-012-1222-4

Abstract: More and more herbal medicines are found to be the substrates of drug transporters. In this paper, chromatography/tandem mass spectrometry (LC/MS/MS) combined with radioisotope method was used for the quantification of catalpol, a traditional Chinese medicine, to study the affinity relationship between herbal medicines and transporters. Catalpol uptake experiment was carried out by using several transporters (OAT1, OCT2, OAT3, OATP1B1 and OATP2B1). And samples were precipitated with methanol and quantified with LC/MS/MS. The results show that catalpol has a good affinity with OCT2-transfected S2 cells. After studying drug-drug interaction between catalpol and C-tetraethylammonium (TEA), we found that catalpol is able to facilitate TEA transport mediated by OCT2, suggesting that catalpol could probably be a new promoter of OCT2.

Keywords： catalpol     LC/MS/MS     OCT2    

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Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries

Jingning SHAN, Xiaofang YANG, Chao YAN, Yiguang JU, Lin CHEN, Fang ZHAO

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 626-635 doi: 10.1007/s11708-019-0650-y

Abstract: Single wall carbon nanotube (SWCNT) additives were formulated into µm-Si-graphite composite electrodesParticularly, Si (10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92% FCE atIn addition, full cells assembled with high nickel-NCM811 cathodes and µm-Si-graphite composite anodesFinally, criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective

Keywords： lithium-ion battery     Si anode     Si-graphite composite     single wall carbon nanotube (SWCNT)     NCM811    

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Current progress on scaffolds of tissue engineering heart valves

DONG Nianguo, SHI Jiawei, CHEN Si, HONG Hao, HU Ping

Frontiers of Medicine 2008, Volume 2, Issue 3,   Pages 229-234 doi: 10.1007/s11684-008-0043-9

Abstract: Tissue engineering heart valves (TEHV) may be the most promising valve substitute, but the study has been relatively stagnant in the recent five years due to the special position, function and mechanical property of heart valves. It is one of the key factors to select an ideal scaffold material in the construction of TEHV. And this article will briefly review the current research and progress on the scaffolds of TEHV, especially based on Chinese works.

Keywords： function     scaffold     promising     research     engineering    

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Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum

Yu Cao, Xinyun Zhu, Xingyu Tong, Jing Zhou, Jian Ni, Jianjun Zhang, Jinbo Pang

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 6,   Pages 997-1005 doi: 10.1007/s11705-019-1906-0

Abstract: Among them, micro-crystalline Si and Ge based thin film solar cells have advantages of high efficiencythe record efficiency of 24.80% has been realized with the typical quadruple junction structure of a-Si:H/a-Si Ge :H/µc-Si:H/µc-Si Ge :H.

Keywords： thin films     solar cells     quadruple junction solar cell     amorphous silicon     silicon germanium alloy     quantum efficiency    

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Recent advances in system reliability optimization driven by importance measures

Shubin SI, Jiangbin ZHAO, Zhiqiang CAI, Hongyan DUI

Frontiers of Engineering Management 2020, Volume 7, Issue 3,   Pages 335-358 doi: 10.1007/s42524-020-0112-6

Abstract: System reliability optimization problems have been widely discussed to maximize system reliability with resource constraints. Birnbaum importance is a well-known method for evaluating the effect of component reliability on system reliability. Many importance measures (IMs) are extended for binary, multistate, and continuous systems from different aspects based on the Birnbaum importance. Recently, these IMs have been applied in allocating limited resources to the component to maximize system performance. Therefore, the significance of Birnbaum importance is illustrated from the perspective of probability principle and gradient geometrical sense. Furthermore, the equations of various extended IMs are provided subsequently. The rules for simple optimization problems are summarized to enhance system reliability by using ranking or heuristic methods based on IMs. The importance-based optimization algorithms for complex or large-scale systems are generalized to obtain remarkable solutions by using IM-based local search or simplification methods. Furthermore, a general framework driven by IM is developed to solve optimization problems. Finally, some challenges in system reliability optimization that need to be solved in the future are presented.

Keywords： importance measure     system performance     reliability optimization     optimization rules     optimization algorithms    

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Title Author Date Type Operation

Plasma enhanced chemical vapor deposition of excellent a-Si:H passivation layers for a-Si:H/c-Si heterojunction

Lei ZHAO,Wenbin ZHANG,Jingwei CHEN,Hongwei DIAO,Qi WANG,Wenjing WANG

Journal Article

Analysis of the double-layer α-Si:H emitter with different doping concentrations for α-Si:H/c-Si heterojunction

Haibin HUANG,Gangyu TIAN,Tao WANG,Chao GAO,Jiren YUAN,Zhihao YUE,Lang ZHOU

Journal Article

Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Journal Article

Mercury enrichment in

Chunhao Dai, Pufeng Qin, Zhangwei Wang, Jian Chen, Xianshan Zhang, Si Luo

Journal Article

Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Journal Article

Numerical simulation of charge stratifications to improve combustion and NO formation of lean-burn SI

Zhijun PENG ,

Journal Article

Ga(X)N/Si nanoarchitecture: An emerging semiconductor platform for sunlight-powered water splitting toward

Journal Article

Si Micromachined Gyroscope Driven by the Rotating Carrier

Zhang Fuxue,Mao Xu,Zhang wei

Journal Article

Impacts of cone-structured interface and aperiodicity on nanoscale thermal transport in Si/Ge superlattices

Pengfei JI, Yiming RONG, Yuwen ZHANG, Yong TANG

Journal Article

Fabrication of Si-based three-dimensional microbatteries: A review

Chuang YUE, Jing LI, Liwei LIN

Journal Article

LC/MS/MS and radioisotope method combined for recognizing the affinity between catalpol and OCT2 transporter

Zhiyu ZHANG, Changxiao LIU, Duanyun SI, Rong LU, Xiulin YI

Journal Article

Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries

Jingning SHAN, Xiaofang YANG, Chao YAN, Yiguang JU, Lin CHEN, Fang ZHAO

Journal Article

Current progress on scaffolds of tissue engineering heart valves

DONG Nianguo, SHI Jiawei, CHEN Si, HONG Hao, HU Ping

Journal Article

Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum

Yu Cao, Xinyun Zhu, Xingyu Tong, Jing Zhou, Jian Ni, Jianjun Zhang, Jinbo Pang

Journal Article

Recent advances in system reliability optimization driven by importance measures

Shubin SI, Jiangbin ZHAO, Zhiqiang CAI, Hongyan DUI

Journal Article