Tongji Zhejiang College
Tongji Zhejiang College
Deng G.-H.,CAS Dalian Institute of Chemical Physics |
Shen Y.,CAS Dalian Institute of Chemical Physics |
Shen Y.,Tongji Zhejiang College |
He Z.,CAS Dalian Institute of Chemical Physics |
And 5 more authors.
Physical Chemistry Chemical Physics | Year: 2017
In this report, ultrafast time-resolved infrared spectroscopy is used to study the rotational motion of the liquid ethanol molecule. The results showed that the methyl, methylene, and CO groups have close rotational relaxation times, 1-2 ps, and the rotational relaxation time of the hydroxyl group (-OH) is 8.1 ps. The fast motion of the methyl, methylene and CO groups, and the slow motion of the hydroxyl group suggested that the ethanol molecules experience anisotropic motion in the liquid phase. The slow motion of the hydroxyl group also shows that the hydrogen bonded network could be considered as an effective molecule. The experimental data provided in this report are helpful for theorists to build models to understand the molecular rotational motion of liquid ethanol. Furthermore, our experimental method, which can provide more data concerning the rotational motion of sub groups of liquid molecules, will be useful for understanding the complicated molecular motion in the liquid phase. © 2017 the Owner Societies.
Wu J.,Tongji Zhejiang College
Agro Food Industry Hi-Tech | Year: 2017
Prefabricated concrete can effectively improve the construction efficiency of the building, reduce construction costs, and reduce its impact on the environment and the interference of residents. In order to carry out the analysis on the mechanical behavior of prefabricated concrete frame structure better, in this paper, through the contrast experiment, the mechanics experiments of the cast-in-situ concrete frame and the prefabricated concrete frame structure were compared, and the mechanical properties were analyzed. It can be seen from the contrast experiment that the prefabricated concrete frame structure and the cast-in-place concrete frame have the same mechanical properties, so the same calculation method can be used in the design, and it also can be applied to specific engineering practice.
Wu Z.,Tongji Zhejiang College
IOP Conference Series: Earth and Environmental Science | Year: 2017
In this paper, a method of building the fuzzy complementary judgement matrix and checking consistency is introduced based on the knowledge of the basic theory of FAHP and the procedure to establish the mathematical model corresponded. The scope and the advantages in the problems of multi-objective decisions have also been discussed. The availability of its use in the management system in pavement maintenance is demonstrated by analyzing the optimization for maintenance. Meanwhile, the faulty is also pointed out. © Published under licence by IOP Publishing Ltd.
Shi P.,Tongji Zhejiang College |
Shen J.,Tongji Zhejiang College |
He D.,Tongji University
Guangxue Jishu/Optical Technique | Year: 2017
In view of technical requirements for dam safety monitoring, a dam horizontal displacement monitoring system is developed based on a principle of plumb line. The system takes grating ruler, laser transmitter and receiver, gear motor as the main moving parts, adopts powerful ARM kernel chip is adopted as micro-controller, the large screen LCD is used for human-computer interaction interface. The device can achieve accurate measurement of transverse and longitudinal axis of the dam. The system also has functions of manual real-time measurement and automatic measurement, and can upload test results through the 485 bus to the control center for display and analysis. The experimental results show that the equipment has the advantages of high precision, low cost and small error. © 2017, Editorial Board of Optical Technique. All right reserved.
Pan X.,Tongji Zhejiang College |
Zhang G.,Tongji Zhejiang College |
Zhang Y.,Tongji Zhejiang College |
Gao Y.,Zhejiang Jiaxing Sanyi Engineering Detection Co.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2017
Nano-SiO2 blended cement pastes for grouting soil nailing were produced, using hydrophilic nano-SiO2 powders and P· I 42.5 cement as raw materials. Bleeding height, slump extension and strength of cement pastes containing different contents of nano-SiO2 powders were measured. Microstructures and composition of nano-SiO2 blended cement pastes at different ages were investigated by X-ray diffractometry(XRD) and thermal gravity-differential thermal analysis(TG-DTA). The results show that bleeding height and slump extension of cement pastes decreased with increasing nano-SiO2 content. By blending nano-SiO2 powders into cement pastes, the flexural strength and compressive strength of hardened cement pastes are enhanced, especially at later age. The optimum nano-SiO2 content is 1.0%-2.0%. Nano-SiO2 blended cement pastes contain less Ca(OH)2 and more C-S-H gel than pure cement paste. © 2017, Editorial Department of Journal of Building Materials. All right reserved.
Zhou S.,Tongji University |
Zhou S.,Tongji Zhejiang College |
Wang S.-J.,Tongji University
Journal of Donghua University (English Edition) | Year: 2015
A diesel engine of conventional trucks has a low efficiency under the idling condition, leading to a high cost for heating or cooling in the cab during night. The solution to this problem will have great significance on energy conservation and emission reduction. A new auxiliary power unit of solid oxide fuel cell (SOFC-APU) with high efficiency solves this problem perfectly. Heat pump air conditioner is considered as a promising device for the application of SOFC-APU with a high cooling and heating efficiency. To make a quantitative analysis for the application of SOFC-APU, a model is built in Matlab/Simulink. The diesel engine model and SOFC-APU model are fitted based on some experimental data of SOFC-APU and diesel engine during the idling operation. An analysis of the application of SOFC-APU on different trucks in Northeast China is comprehensively made, including efficiency and emission. Copyright © 2015 Editorial Department of Journal of Donghua University, Shanghai, China. All rights reserved.
Zhang G.-X.,Tongji Zhejiang College |
Guan L.-B.,Tongji Zhejiang College
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014
Based on the soil-nailing tensile experiments under different pressure grouting parameters, the effect of grouting parameters such as grouting amount and water-cement ratio on bearing capacity of soil nailings with different lengths is analyzed. The results show that, in the experimental range, under the same quantity of grouting, the ultimate tensile strength of soil nailings increases with the decreasing water-cement ratio. Specifically speaking, for the short soil nailings with higher grouting quantity in unit length, the higher the grouting quantity is, the lower the effect of water-cement ratio on the change rate of the ultimate tension is. On the contrary, for the long soil nailings with lower grouting quantity in unit length, the effect of water-cement ratio on the change rate of the ultimate tension is larger while the quantity of grouting is higher. Meanwhile, under the same water-cement ratio, the maximum tensile strength of soil nailings increases with the quantity of grouting increases. Here, for the short soil nailings with higher grouting quantity in unit length, the higher the water-cement ratio is, the larger the effect of grouting quantity on the change rate of the ultimate tension is. Conversely, for the long soil nailings with lower grouting quantity in unit length, the higher the water-cement ratio is, however, the lower the effect of grouting quantity on the change rate of the ultimate tension is.
Zhong Y.-W.,Renmin University of China |
Zhong Y.-W.,Tongji Zhejiang College |
Li T.,Renmin University of China |
Han Q.,Renmin University of China |
Han Q.,University of Hong Kong
Physical Review B - Condensed Matter and Materials Physics | Year: 2011
From the perspective of thermal fluctuations, we investigate the pseudogap phenomena in underdoped high-temperature curpate superconductors. We present a local update Monte Carlo procedure based on the Green's function method to sample the fluctuating pairing field. The Chebyshev polynomial method is applied to calculate the single-particle spectral function directly and efficiently. The evolution of Fermi arcs as a function of temperature is studied by examining the spectral function at Fermi energy as well as the loss of spectral weight. Our results signify the importance of the vortexlike phase fluctuations on the formation of Fermi arcs. © 2011 American Physical Society.
Zhang G.-X.,Tongji Zhejiang College |
Guan L.-B.,Tongji Zhejiang College
Yantu Lixue/Rock and Soil Mechanics | Year: 2014
Based on the analytical solution for soil nailing tension model and the field measured data of soil nailing tensile test,the influences of elastic modulus of cement grout Eg and shear deformation coefficient of soil nailing K on the mechanical properties of soil nailing are analyzed. The results show that the displacement of nail head under the maximum loading decreases as Eg increases. With the increase of Eg, the relative displacement and shear force between soil and nail, decrease in the shallow part of the nail body, and increase in its deep part, respectively. Furthermore, the variations of relative displacement and shear force between soil and nail along the nail body direction become much smaller with the increase of Eg, resulting in more homogeneous distribution of side friction resistance along the nail body. As K increases, the relative displacement between soil and nail under the maximum loading decreases and the variation of relative displacement along the nail body direction becomes much smaller, indicating the effect of grouting on soil nailing gradually becomes marginal. With the same change rate of K and Eg,the influence of K on the load-displacement curve of soil nailing is greater than that of Eg, while the influence of K on the shear force between soil and nail is lower than that of Eg. ©, 2014, Academia Sinica. All right reserved.
PubMed | Chi Mei Medical Center and Tongji Zhejiang College
Type: Journal Article | Journal: BMC medical research methodology | Year: 2017
Many continuous item responses (CIRs) are encountered in healthcare settings, but no one uses item response theorys (IRT) probabilistic modeling to present graphical presentations for interpreting CIR results. A computer module that is programmed to deal with CIRs is required. To present a computer module, validate it, and verify its usefulness in dealing with CIR data, and then to apply the model to real healthcare data in order to show how the CIR that can be applied to healthcare settings with an example regarding a safety attitude survey.Using Microsoft Excel VBA (Visual Basic for Applications), we designed a computer module that minimizes the residuals and calculates models expected scores according to person responses across items. Rasch models based on a Wright map and on KIDMAP were demonstrated to interpret results of the safety attitude survey.The author-made CIR module yielded OUTFIT mean square (MNSQ) and person measures equivalent to those yielded by professional Rasch Winsteps software. The probabilistic modeling of the CIR module provides messages that are much more valuable to users and show the CIR advantage over classic test theory.Because of advances in computer technology, healthcare users who are familiar to MS Excel can easily apply the study CIR module to deal with continuous variables to benefit comparisons of data with a logistic distribution and model fit statistics.