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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.In this paper, intrinsic a-Si:H layers were prepared on n-type Cz c-Si substrates by 27.12 MHz PECVDThe a-Si:H layer microstructure was further investigated by Raman and Fourier transform infrared (FTIR

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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Combustion characteristics of SI engine fueled with methanol-gasoline blends during cold start

SONG Ruizhi, LIU Shenghua, LIANG Xiaoqiang, Tiegang H U

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 395-400 doi: 10.1007/s11708-008-0081-7

Abstract: A 3-cylinder port fuel injection (PFI) engine fueled with methanol-gasoline blends was used to study combustion and emission characteristics. Cylinder pressure analysis indicates that engine combustion is improved when methanol is added to gasoline. With the increase of methanol, the flame developing period and the rapid combustion period are shortened, and the indicated mean effective pressure increases during the first 50 cycles. Meanwhile, a novel quasi-instantaneous sampling system was designed to measure engine emissions during cold start and warm-up. The results at 5°C show that unburned hydrocarbon (UHC) and carbon monoxide (CO) decrease remarkably. Hydrocarbon (HC) reduces by 40% and CO by 70% when fueled with M30 (30% methanol in volume). The exhaust gas temperature is about 140°C higher at 200 s after operation compared with that of gasoline.

Keywords： combustion     3-cylinder     indicated     Cylinder pressure     emission    

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Fatigue crack initiation of magnesium alloys under elastic stress amplitudes: A review

H. HAN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 1,   Pages 113-127 doi: 10.1007/s11465-018-0482-1

Abstract: reviewed, including the 3 followings: 1) Fatigue crack initiation of as-cast Mg alloys, 2) influence of microstructure

Keywords： Mg alloys     fatigue behavior     microstructure     crack initiation     deformation mechanism    

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Mechanical properties and microstructure of multilayer graphene oxide cement mortar

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 1058-1070 doi: 10.1007/s11709-021-0747-3

Abstract: reports on the effects of multilayer graphene oxide (MGO) on compressive strength, flexural strength, and microstructureStill, it can help to improve the microstructure of the cement mortar via regulating hydration productsFurthermore, the regulating action of MGO for the microstructure of cement mortar at an early age was

Keywords： graphene oxide     cement     mortar     mechanical properties     microstructure    

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Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

Elena CERRO-PRADA,Miguel MANSO,Vicente TORRES,Jesús SORIANO

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 189-197 doi: 10.1007/s11709-015-0326-6

Abstract: As a particular microstructural feature, TiO containing calcium silicate hydrate (C-H-S) particles areidentified as networking centers of a C-S-H gel fiber matrix.Such new cement matrix may be twofold advantageous since it additionally promotes the formation of C-S-H

Keywords： cement composites     photocatalytic TiO2     sol-gel     C-S-H gel     microstructure    

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Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent

Beibei SUN, Hao WU, Weimin SONG, Zhe LI, Jia YU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1274-1284 doi: 10.1007/s11709-020-0656-x

Abstract: quantitively investigated the effect of SAP on hydration, autogenous shrinkage, mechanical properties, and microstructureScanning Electron Microscope (SEM) was employed to assess the microstructure evolution.Microstructure characteristics showed that pores and gaps were introduced when SAP was added.The microstructure difference caused by SAP contributed to the inferior mechanical behaviors of cement

Keywords： Superabsorbent Polymer     mechanical properties     hydration heat     autogenous shrinkage     microstructure    

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Effects of fiber curvature on the microstructure of the interfacial transition zone in fresh concrete

CHEN Huisu, SUN Wei, ZHAO Qingxin, L. J. Sluys, P. Stroeven

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1,   Pages 99-106 doi: 10.1007/s11709-007-0010-6

Abstract: However, no information is available on the influence of the curvature of a rigid surface on the microstructurepaper employed computer simulation technology to study the influence of fiber curvature on the initial microstructureThen, the influence of the ratio of fiber diameter to particle diameter on the initial ITZ s microstructureTherefore, one may use the ITZ s microstructure around a flat aggregate surface to represent the ITZs microstructure around a cylindrical fiber in the fresh state, and vice versa.

Keywords： diameter     initial microstructure     influence     surface     spherical particle    

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Recent advancements in optical microstructure fabrication through glass molding process

Tianfeng ZHOU,Xiaohua LIU,Zhiqiang LIANG,Yang LIU,Jiaqing XIE,Xibin WANG

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 46-65 doi: 10.1007/s11465-017-0425-2

Abstract: This paper presents an overview of optical microstructure fabrication through glass molding and highlightsnew mold materials and their fabrication methods, viscoelastic constitutive modeling of glass, and microstructure

Keywords： optical microstructure     microgroove     microlens     glass molding process     single-point diamond cutting    

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Compressive behavior and microstructure of concrete mixed with natural seawater and sea sand

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1347-1357 doi: 10.1007/s11709-021-0780-2

Abstract: electron microscope (SEM) and X-ray powder diffraction (XRD) methods were applied to understand the microstructureSEM images showed a more compact microstructure in higher strength SSC.The findings in this study can provide more insights into the microstructure of SSC along with its short

Keywords： seawater and sea sand concrete     compressive strength     strain field     microstructure     hydration products    

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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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Effects of natural zeolite and sulfate ions on the mechanical properties and microstructure of plastic

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1,   Pages 86-98 doi: 10.1007/s11709-021-0793-x

Abstract: Natural zeolite (NZ) is a relatively abundant mineral resource and in this research, the microstructure

Keywords： plastic concrete     sulfate resistance     natural zeolite     triaxial compression test     SEM     permeability    

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Differences in microstructure and properties between selective laser melting and traditional manufacturing

Bo SONG,Xiao ZHAO,Shuai LI,Changjun HAN,Qingsong WEI,Shifeng WEN,Jie LIU,Yusheng SHI

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 2,   Pages 111-125 doi: 10.1007/s11465-015-0341-2

Abstract: traditional methods, such as casting and forging; for instance, the former greatly differs in terms of microstructureCenter (HUST-RMC) and compared with characteristics described in other reported studies, microstructure

Keywords： selective laser melting     microstructure     performance     application    

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Correlation of chloride diffusion coefficient and microstructure parameters in concrete: A comparative

Yurong ZHANG, Shengxuan XU, Yanhong GAO, Jie GUO, Yinghui CAO, Junzhi ZHANG

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1509-1519 doi: 10.1007/s11709-020-0681-9

Abstract: Permeability is a major indicator of concrete durability, and depends primarily on the microstructureIn this study, a variety of concrete samples were prepared to investigate their microstructure characteristicsFurthermore, the chloride diffusion coefficient of concrete was measured to explore its correlation with the microstructureMoreover, microstructure parameters measured via NMR reveal a lower correlation coefficient versus

Keywords： permeability     microstructure     NMR     MIP     X-CT    

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Calculating frictional force with considering material microstructure and potential on contact surfaces

XU Zhongming, HUANG Ping

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 474-477 doi: 10.1007/s11465-007-0082-y

Abstract: relationships between frictional force and parameters of a tribo-system, such as surface energy and microstructure

Keywords： coefficient     dissipation mechanism     universal adhesive     interfacial     Independent Oscillator    

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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

Combustion characteristics of SI engine fueled with methanol-gasoline blends during cold start

SONG Ruizhi, LIU Shenghua, LIANG Xiaoqiang, Tiegang H U

Journal Article

Fatigue crack initiation of magnesium alloys under elastic stress amplitudes: A review

H. HAN

Journal Article

Mechanical properties and microstructure of multilayer graphene oxide cement mortar

Journal Article

Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

Elena CERRO-PRADA,Miguel MANSO,Vicente TORRES,Jesús SORIANO

Journal Article

Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent

Beibei SUN, Hao WU, Weimin SONG, Zhe LI, Jia YU

Journal Article

Effects of fiber curvature on the microstructure of the interfacial transition zone in fresh concrete

CHEN Huisu, SUN Wei, ZHAO Qingxin, L. J. Sluys, P. Stroeven

Journal Article

Recent advancements in optical microstructure fabrication through glass molding process

Tianfeng ZHOU,Xiaohua LIU,Zhiqiang LIANG,Yang LIU,Jiaqing XIE,Xibin WANG

Journal Article

Compressive behavior and microstructure of concrete mixed with natural seawater and sea sand

Journal Article

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

Yanli LIN, Xiaohui SI, Fulei CHU

Journal Article

Effects of natural zeolite and sulfate ions on the mechanical properties and microstructure of plastic

Journal Article

Differences in microstructure and properties between selective laser melting and traditional manufacturing

Bo SONG,Xiao ZHAO,Shuai LI,Changjun HAN,Qingsong WEI,Shifeng WEN,Jie LIU,Yusheng SHI

Journal Article

Correlation of chloride diffusion coefficient and microstructure parameters in concrete: A comparative

Yurong ZHANG, Shengxuan XU, Yanhong GAO, Jie GUO, Yinghui CAO, Junzhi ZHANG

Journal Article

Calculating frictional force with considering material microstructure and potential on contact surfaces

XU Zhongming, HUANG Ping

Journal Article