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54. Study on the Kinematics and Dynamics Simulation of Helical Gear Limited Slip Differential

Author

Liu Xiaoyong, Wang Haoren, Cui Gaojian, Li Shaosong, Ren Haibo, and Tu Yongfa

Subjects
Limited slip differential, Helical gear, Kinematics, Dynamics, Simulation, Mechanical engineering and machinery, TJ1-1570
Abstract

Three-dimension solid model of helical gear limited slip differential is built by using CATIA,and then the virtual prototype model is established through importing the 3D solid model into ADAMS/View. In the virtual environment,based on the kinematics dynamics simulation and analysis with two different typical work conditions,including straight-line driving on good pavement and double tire-road friction coefficients,the torque curve,the force and angular velocity curves of helical gear of limited slip differential are acquired.By comparing with theoretical calculations values,the correctness of model and the effectiveness of simulation method are verified. The study results provide the basis for the dynamic optimization and fatigue life prediction of the helical gear limited slip differential.

Published
2017
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60. Research on the Structural Design of Academic Report Complex Building in a University

Author

Ren Haibo

Subjects
Environmental sciences, GE1-350
Abstract

This project is the construction project of the academic report comprehensive building of the Central Youth League School. The main function of the project is the academic report room, including an 800-person lecture hall, a 300-person multi-function lecture hall, a 500-person multi-function lecture hall, an exhibition hall, etc., and three underground floors. There are three floors above the ground, and one floor is partially high. There are 12.8, 13.8, 15.7, 18.2, 18.6, 20.8, 27.8 meters in the sub-regions of the roof structure elevation. This article introduces the structural system, the judgment of structural out-of-limit situations, prestress design, steel truss design, suspension steel structure design, cantilevered large-span concrete beams, etc., through a variety of structural calculation and analysis methods, and find out structural weaknesses, and adopt Corresponding seismic strengthening measures, the calculation results show that the structure has good seismic performance and can meet the requirements of the code.

Published
2021
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76. Cross-Linked SnO 2 Nanosheets Modified by Ag Nanoparticles for Formaldehyde Vapor Detection.

Author

Weng, Huaipeng, Dong, Xumeng, Sun, Yufeng, Ren, Haibo, Huang, Jiarui, and Joo, Sang Woo

Subjects
STANNIC oxide, NANOSTRUCTURED materials, FORMALDEHYDE, NANOPARTICLES, HEAT treatment
Abstract

Ag@SnO2 nanosheets were prepared through a hydrothermal method followed by heat treatment and a liquid reduction process. Many Ag nanoparticles (Ag NPs) were dispersed uniformly over the surface of the SnO2 nanosheets. The thickness of the SnO2 nanosheets was approximately 10 nm. After decoration with Ag NPs, the Ag@SnO2 nanosheet sensors exhibited improved gas-sensing behaviors compared to the pure SnO2 nanosheet sensor. The response of cross-linked SnO2 nanosheets decorated by Ag NP sensors for 100 ppm formaldehyde vapor was up to 101.4, which was double that (45.5) of the pure SnO2 nanosheet sensor. The response and recovery times of the Ag@SnO2 sensor were 21 s and 23 s, respectively. The Ag@SnO2 nanosheet sensors showed reasonable cycling stability, as demonstrated by testing with 100 ppm formaldehyde 10 times. The superior gas-sensing behaviors of the Ag@SnO2 sensor were due to the large specific surface area, cross-linked nanostructure, and synergistic effect of the Ag NPs with huge sensitizing active sites and numerous SnO2 nanosheets. [ABSTRACT FROM AUTHOR]

Published
2023
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82. Effect of Heat Treatment on Microstructure and Tribological Properties of Laser Cladding CeO 2 /Ni60 Composite Coating on 35CrMoV Steel.

Author

Gao, Zhiming, Zhang, Shuqing, Gao, Zhongtang, Ren, Haibo, and Zhang, Chuanwei

Subjects
EFFECT of heat treatment on microstructure, COMPOSITE coating, CERIUM oxides, TRIBOLOGY, HEAT treatment, SCANNING electron microscopy, MICROSCOPY
Abstract

A Ni60 cladding layer with addition of 6.0% CeO2 was prepared on 35CrMoV steel by laser cladding technology. The prepared sample was placed at 500 °C, 600 °C and 700 °C for 60 min to explore the effects of heat treatment on the tribological properties of the composite coating. The microstructure, phase composition, microhardness and tribological properties of the composite coating were characterized by optical microscopy and scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-Vickers hardness tester and MicroXAM-800 optical surface photometer, respectively. According to the above experimental results analysis, the main components of 6.0% CeO2/Ni60 cladding layer are γ-(Fe,Ni),Cr7C3,Cr23C6,CrB, CrFeB and Cr2Ni3. By calculating the FWHM value and the left shift of the XRD diffraction peak, it is found that the coating grains are remarkably refined and the microstructure uniformity is significantly improved under the condition of heat treatment at 500 °C. The experimental results show that the Ni60 composite coating with 6.0% CeO2 has the best friction and wear performance at 500 °C. The wearing quality of the composite coating at 500 °C was reduced by 43%. [ABSTRACT FROM AUTHOR]

Published
2023
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83. Effect of CeO2 on Microstructure and Wear Property of Laser Cladding Ni-Based Coatings Fabricated on 35CrMoV Steel.

Author

Gao, Zhongtang, Ren, Haibo, Geng, Haomin, Yu, Yuan, Gao, Zhiming, and Zhang, Chuanwei

Subjects
MECHANICAL wear, X-ray photoelectron spectroscopy, MICROSTRUCTURE, EUTECTIC structure, MICROSCOPY
Abstract

The effects of CeO2 addition on the macro-morphology, surface cracks, microstructure, precipitated phases and wear property of laser cladding Ni-based coatings on 35CrMoV steel were investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscope (TEM), x-ray photoelectron spectroscopy (XPS) and friction and wear tester, respectively. The results indicated that the microstructure could be remarkably refined with the addition of CeO2. The width of eutectic structure is reduced from 1.74 μm to 237.5 nm with the amount of CeO2 increases from 0 to 4.0 wt.%. Meanwhile, CeO2 significantly decreases the number of the oxides and it can be obtained the minimal number of cracks when the CeO2 addition reaches 4.0 wt.%. The main phase composition of Ni60 cladding layer is Ni3Fe, Ni3V, Cr23C6 and Fe5C2. The distortional zone was observed around the eutectic of the coating. The average friction coefficient (0.438) and the wear resistance are the best when the addition of CeO2 is 4.0 wt.%. [ABSTRACT FROM AUTHOR]

Published
2022
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92. ForestGEO: understanding forest diversity and dynamics through a global observatory network

Author

Davies, Stuart J., Abiem, Iveren, Abu Salim, Kamariah, Aguilar, Salomón, Allen, David, Alonso, Alfonso, Anderson-Teixeira, Kristina, Andrade, Ana, Arellano, Gabriel, Ashton, Peter S., Baker, Patrick J., Baker, Matthew E., Baltzer, Jennifer L., Basset, Yves, Bissiengou, Pulchérie, Bohlman, Stephanie, Bourg, Norman A., Brockelman, Warren Y., Bunyavejchewin, Sarayudh, Burslem, David F.R.P., Cao, Min, Cárdenas, Dairon, Chang, Li-Wan, Chang-Yang, Chia-Hao, Chao, Kuo-Jung, Chao, Wei-Chun, Chapman, Hazel, Chen, Yu-Yun, Chisholm, Ryan A., Chu, Chengjin, Chuyong, George, Clay, Keith, Comita, Liza S., Condit, Richard, Cordell, Susan, Dattaraja, Handanakere S., de Oliveira, Alexandre Adalardo, den Ouden, Jan, Detto, Matteo, Dick, Christopher, Du, Xiaojun, Duque, Álvaro, Ediriweera, Sisira, Ellis, Erle C., Engone Obiang, Nestor Laurier, Esufali, Shameema, Ewango, Corneille E.N., Fernando, Edwino S., Filip, Jonah, Fischer, Gunter A., Foster, Robin, Giambelluca, Thomas, Giardina, Christian, Gilbert, Gregory S., Gonzalez-Akre, Erika, Gunatilleke, I.A.U.N., Gunatilleke, C.V.S., Hao, Zhanqing, Hau, Billy C.H., He, Fangliang, Ni, Hongwei, Howe, Robert W., Hubbell, Stephen P., Huth, Andreas, Inman-Narahari, Faith, Itoh, Akira, Janík, David, Jansen, Patrick A., Jiang, Mingxi, Johnson, Daniel J., Jones, F. Andrew, Kanzaki, Mamoru, Kenfack, David, Kiratiprayoon, Somboon, Král, Kamil, Krizel, Lauren, Lao, Suzanne, Larson, Andrew J., Li, Yide, Li, Xiankun, Litton, Creighton M., Liu, Yu, Liu, Shirong, Lum, Shawn K.Y., Luskin, Matthew S., Lutz, James A., Luu, Hong Truong, Ma, Keping, Makana, Jean-Remy, Malhi, Yadvinder, Martin, Adam, McCarthy, Caly, McMahon, Sean M., McShea, William J., Memiaghe, Hervé, Mi, Xiangcheng, Mitre, David, Mohamad, Mohizah, Monks, Logan, Muller-Landau, Helene C., Musili, Paul M., Myers, Jonathan A., Nathalang, Anuttara, Ngo, Kang Min, Norden, Natalia, Novotny, Vojtech, O'Brien, Michael J., Orwig, David, Ostertag, Rebecca, Papathanassiou, Konstantinos, Parker, Geoffrey G., Pérez, Rolando, Perfecto, Ivette, Phillips, Richard P., Pongpattananurak, Nantachai, Pretzsch, Hans, Ren, Haibo, Reynolds, Glen, Rodriguez, Lillian J., Russo, Sabrina E., Sack, Lawren, Sang, Weiguo, Shue, Jessica, Singh, Anudeep, Song, Guo-Zhang M., Sukumar, Raman, Sun, I-Fang, Suresh, Hebbalalu S., Swenson, Nathan G., Tan, Sylvester, Thomas, Sean C., Thomas, Duncan, Thompson, Jill, Turner, Benjamin L., Uowolo, Amanda, Uriarte, María, Valencia, Renato, Vandermeer, John, Vicentini, Alberto, Visser, Marco, Vrska, Tomas, Wang, Xugao, Wang, Xihua, Weiblen, George D., Whitfeld, Timothy J.S., Wolf, Amy, Wright, S. Joseph, Xu, Han, Yao, Tze Leong, Yap, Sandra L., Ye, Wanhui, Yu, Mingjian, Zhang, Minhua, Zhu, Daoguang, Zhu, Li, Zimmerman, Jess K., Zuleta, Daniel, Davies, Stuart J., Abiem, Iveren, Abu Salim, Kamariah, Aguilar, Salomón, Allen, David, Alonso, Alfonso, Anderson-Teixeira, Kristina, Andrade, Ana, Arellano, Gabriel, Ashton, Peter S., Baker, Patrick J., Baker, Matthew E., Baltzer, Jennifer L., Basset, Yves, Bissiengou, Pulchérie, Bohlman, Stephanie, Bourg, Norman A., Brockelman, Warren Y., Bunyavejchewin, Sarayudh, Burslem, David F.R.P., Cao, Min, Cárdenas, Dairon, Chang, Li-Wan, Chang-Yang, Chia-Hao, Chao, Kuo-Jung, Chao, Wei-Chun, Chapman, Hazel, Chen, Yu-Yun, Chisholm, Ryan A., Chu, Chengjin, Chuyong, George, Clay, Keith, Comita, Liza S., Condit, Richard, Cordell, Susan, Dattaraja, Handanakere S., de Oliveira, Alexandre Adalardo, den Ouden, Jan, Detto, Matteo, Dick, Christopher, Du, Xiaojun, Duque, Álvaro, Ediriweera, Sisira, Ellis, Erle C., Engone Obiang, Nestor Laurier, Esufali, Shameema, Ewango, Corneille E.N., Fernando, Edwino S., Filip, Jonah, Fischer, Gunter A., Foster, Robin, Giambelluca, Thomas, Giardina, Christian, Gilbert, Gregory S., Gonzalez-Akre, Erika, Gunatilleke, I.A.U.N., Gunatilleke, C.V.S., Hao, Zhanqing, Hau, Billy C.H., He, Fangliang, Ni, Hongwei, Howe, Robert W., Hubbell, Stephen P., Huth, Andreas, Inman-Narahari, Faith, Itoh, Akira, Janík, David, Jansen, Patrick A., Jiang, Mingxi, Johnson, Daniel J., Jones, F. Andrew, Kanzaki, Mamoru, Kenfack, David, Kiratiprayoon, Somboon, Král, Kamil, Krizel, Lauren, Lao, Suzanne, Larson, Andrew J., Li, Yide, Li, Xiankun, Litton, Creighton M., Liu, Yu, Liu, Shirong, Lum, Shawn K.Y., Luskin, Matthew S., Lutz, James A., Luu, Hong Truong, Ma, Keping, Makana, Jean-Remy, Malhi, Yadvinder, Martin, Adam, McCarthy, Caly, McMahon, Sean M., McShea, William J., Memiaghe, Hervé, Mi, Xiangcheng, Mitre, David, Mohamad, Mohizah, Monks, Logan, Muller-Landau, Helene C., Musili, Paul M., Myers, Jonathan A., Nathalang, Anuttara, Ngo, Kang Min, Norden, Natalia, Novotny, Vojtech, O'Brien, Michael J., Orwig, David, Ostertag, Rebecca, Papathanassiou, Konstantinos, Parker, Geoffrey G., Pérez, Rolando, Perfecto, Ivette, Phillips, Richard P., Pongpattananurak, Nantachai, Pretzsch, Hans, Ren, Haibo, Reynolds, Glen, Rodriguez, Lillian J., Russo, Sabrina E., Sack, Lawren, Sang, Weiguo, Shue, Jessica, Singh, Anudeep, Song, Guo-Zhang M., Sukumar, Raman, Sun, I-Fang, Suresh, Hebbalalu S., Swenson, Nathan G., Tan, Sylvester, Thomas, Sean C., Thomas, Duncan, Thompson, Jill, Turner, Benjamin L., Uowolo, Amanda, Uriarte, María, Valencia, Renato, Vandermeer, John, Vicentini, Alberto, Visser, Marco, Vrska, Tomas, Wang, Xugao, Wang, Xihua, Weiblen, George D., Whitfeld, Timothy J.S., Wolf, Amy, Wright, S. Joseph, Xu, Han, Yao, Tze Leong, Yap, Sandra L., Ye, Wanhui, Yu, Mingjian, Zhang, Minhua, Zhu, Daoguang, Zhu, Li, Zimmerman, Jess K., and Zuleta, Daniel

Abstract

ForestGEO is a network of scientists and long-term forest dynamics plots (FDPs) spanning the Earth's major forest types. ForestGEO's mission is to advance understanding of the diversity and dynamics of forests and to strengthen global capacity for forest science research. ForestGEO is unique among forest plot networks in its large-scale plot dimensions, censusing of all stems ≥1 cm in diameter, inclusion of tropical, temperate and boreal forests, and investigation of additional biotic (e.g., arthropods) and abiotic (e.g., soils) drivers, which together provide a holistic view of forest functioning. The 71 FDPs in 27 countries include approximately 7.33 million living trees and about 12,000 species, representing 20% of the world's known tree diversity. With >1300 published papers, ForestGEO researchers have made significant contributions in two fundamental areas: species coexistence and diversity, and ecosystem functioning. Specifically, defining the major biotic and abiotic controls on the distribution and coexistence of species and functional types and on variation in species' demography has led to improved understanding of how the multiple dimensions of forest diversity are structured across space and time and how this diversity relates to the processes controlling the role of forests in the Earth system. Nevertheless, knowledge gaps remain that impede our ability to predict how forest diversity and function will respond to climate change and other stressors. Meeting these global research challenges requires major advances in standardizing taxonomy of tropical species, resolving the main drivers of forest dynamics, and integrating plot-based ground and remote sensing observations to scale up estimates of forest diversity and function, coupled with improved predictive models. However, they cannot be met without greater financial commitment to sustain the long-term research of ForestGEO and other forest plot networks, greatly expanded scientific capacity across the

Published
2021

97. ForestGEO: Understanding forest diversity and dynamics through a global observatory network

Author

Davies, Stuart J., primary, Abiem, Iveren, additional, Abu Salim, Kamariah, additional, Aguilar, Salomón, additional, Allen, David, additional, Alonso, Alfonso, additional, Anderson-Teixeira, Kristina, additional, Andrade, Ana, additional, Arellano, Gabriel, additional, Ashton, Peter S., additional, Baker, Patrick J., additional, Baker, Matthew E., additional, Baltzer, Jennifer L., additional, Basset, Yves, additional, Bissiengou, Pulchérie, additional, Bohlman, Stephanie, additional, Bourg, Norman A., additional, Brockelman, Warren Y., additional, Bunyavejchewin, Sarayudh, additional, Burslem, David F.R.P., additional, Cao, Min, additional, Cárdenas, Dairon, additional, Chang, Li-Wan, additional, Chang-Yang, Chia-Hao, additional, Chao, Kuo-Jung, additional, Chao, Wei-Chun, additional, Chapman, Hazel, additional, Chen, Yu-Yun, additional, Chisholm, Ryan A., additional, Chu, Chengjin, additional, Chuyong, George, additional, Clay, Keith, additional, Comita, Liza S., additional, Condit, Richard, additional, Cordell, Susan, additional, Dattaraja, Handanakere S., additional, de Oliveira, Alexandre Adalardo, additional, den Ouden, Jan, additional, Detto, Matteo, additional, Dick, Christopher, additional, Du, Xiaojun, additional, Duque, Álvaro, additional, Ediriweera, Sisira, additional, Ellis, Erle C., additional, Obiang, Nestor Laurier Engone, additional, Esufali, Shameema, additional, Ewango, Corneille E.N., additional, Fernando, Edwino S., additional, Filip, Jonah, additional, Fischer, Gunter A., additional, Foster, Robin, additional, Giambelluca, Thomas, additional, Giardina, Christian, additional, Gilbert, Gregory S., additional, Gonzalez-Akre, Erika, additional, Gunatilleke, I.A.U.N., additional, Gunatilleke, C.V.S., additional, Hao, Zhanqing, additional, Hau, Billy C.H., additional, He, Fangliang, additional, Ni, Hongwei, additional, Howe, Robert W., additional, Hubbell, Stephen P., additional, Huth, Andreas, additional, Inman-Narahari, Faith, additional, Itoh, Akira, additional, Janík, David, additional, Jansen, Patrick A., additional, Jiang, Mingxi, additional, Johnson, Daniel J., additional, Jones, F. Andrew, additional, Kanzaki, Mamoru, additional, Kenfack, David, additional, Kiratiprayoon, Somboon, additional, Král, Kamil, additional, Krizel, Lauren, additional, Lao, Suzanne, additional, Larson, Andrew J., additional, Li, Yide, additional, Li, Xiankun, additional, Litton, Creighton M., additional, Liu, Yu, additional, Liu, Shirong, additional, Lum, Shawn K.Y., additional, Luskin, Matthew S., additional, Lutz, James A., additional, Luu, Hong Truong, additional, Ma, Keping, additional, Makana, Jean-Remy, additional, Malhi, Yadvinder, additional, Martin, Adam, additional, McCarthy, Caly, additional, McMahon, Sean M., additional, McShea, William J., additional, Memiaghe, Hervé, additional, Mi, Xiangcheng, additional, Mitre, David, additional, Mohamad, Mohizah, additional, Monks, Logan, additional, Muller-Landau, Helene C., additional, Musili, Paul M., additional, Myers, Jonathan A., additional, Nathalang, Anuttara, additional, Ngo, Kang Min, additional, Norden, Natalia, additional, Novotny, Vojtech, additional, O'Brien, Michael J., additional, Orwig, David, additional, Ostertag, Rebecca, additional, Papathanassiou, Konstantinos, additional, Parker, Geoffrey G., additional, Pérez, Rolando, additional, Perfecto, Ivette, additional, Phillips, Richard P., additional, Pongpattananurak, Nantachai, additional, Pretzsch, Hans, additional, Ren, Haibo, additional, Reynolds, Glen, additional, Rodriguez, Lillian J., additional, Russo, Sabrina E., additional, Sack, Lawren, additional, Sang, Weiguo, additional, Shue, Jessica, additional, Singh, Anudeep, additional, Song, Guo-Zhang M., additional, Sukumar, Raman, additional, Sun, I-Fang, additional, Suresh, Hebbalalu S., additional, Swenson, Nathan G., additional, Tan, Sylvester, additional, Thomas, Sean C., additional, Thomas, Duncan, additional, Thompson, Jill, additional, Turner, Benjamin L., additional, Uowolo, Amanda, additional, Uriarte, María, additional, Valencia, Renato, additional, Vandermeer, John, additional, Vicentini, Alberto, additional, Visser, Marco, additional, Vrska, Tomas, additional, Wang, Xugao, additional, Wang, Xihua, additional, Weiblen, George D., additional, Whitfeld, Timothy J.S., additional, Wolf, Amy, additional, Wright, S. Joseph, additional, Xu, Han, additional, Yao, Tze Leong, additional, Yap, Sandra L., additional, Ye, Wanhui, additional, Yu, Mingjian, additional, Zhang, Minhua, additional, Zhu, Daoguang, additional, Zhu, Li, additional, Zimmerman, Jess K., additional, and Zuleta, Daniel, additional

Published
2021
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