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Search Results: 1 - 10 of 86542 matches for " Kun Liu "
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Vibration Analysis of a 51-Story Tower from the Recorded Data of the Earthquake, Typhoon and Ambient Vibration  [PDF]
Kun-Sung Liu
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.61009
Abstract: This study uses the in-structure recordings to investigate the vibration characteristics of a 51-story steel high-rise building in response to a major earthquake, typhoon and ambient vibrations. This presents an opportunity for us to compare the building behaviors, especially their modal properties under different types of excitation. First, we use a two-stage regression procedure to obtain the relations of the building response, including peak floor acceleration and velocity as a function of the wind speed and floor height of the building. Secondly, the structural dynamic characteristics of the high rise building, including the transfer functions and natural frequencies, excited by the Chi-Chi earthquake, Typhoon Aere, and ambient vibrations are also determined and compared. As a result, from the formulas for building response, the predicted peak floor acceleration is higher in the lateral (EW) component than in the longitudinal (NS) component. This is probably due to the greater stiffness of the building in the longitudinal direction than in the lateral direction. In addition, after having identified the 1st, 2nd, and 3rd natural frequencies using the recorded data from the earthquake, typhoon and ambient vibrations, the ranking of the fundamental natural frequencies from low to high is the Chi-Chi earthquake, Typhoon Aere and the ambient vibrations. This means that greater excitation forces of the earthquake have resulted in lower natural frequencies than that produced by the typhoon and ambient vibrations.
Poly[(μ4-benzene-1,3,5-tricarboxylato)bis(N,N-dimethylacetamide)terbium(III)]
Kun Liu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812010264
Abstract: The title compound, [Tb(C9H3O6)(C4H9NO)2], shows a rare-earth three-dimensional metal-organic framework structure. In this complex of an eight-coordinated Tb3+ ion, the asymmetric unit contains one benzene-1,3,5-tricarboxylic ligand and two coordinated dimethylacetamide molecules. Each Tb3+ ion is coordinated by six O atoms from four carboxylate groups of the benzene-1,3,5-tricarboxylic ligands and two O atoms from two terminal dimethylacetamide molecules.
Heat Pump Technology Applies on Air-conditioners Impact on Electric Power  [PDF]
Kun Liu, Xiaoyan Zhou, Hailang He
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B049
Abstract: In recent years, power grid has been experienced in difficult times that there is a shortage of demand load among market, and more and more black out exited that bothered residents’ normal life. With the increment of energy consumption and power load, this problem will be more serious without any feasible solutions. Besides, the air conditioning system is the largest residential energy consumer. In this report, a GSHP air conditioning system has been illustrated and compared with the conventional air conditioning system currently used in Chengdu, Sichuan province, China. The benefits of using the GSHP system are not only on cost saving, but also energy saving and eco-friendly.
Does East Asia Move towards an Optimum Currency Area? Evidence from the Multivariate Structural VAR Analysis
Xing-kun Liu
International Journal of Economics and Finance , 2012, DOI: 10.5539/ijef.v4n12p159
Abstract: Focusing on the symmetry in structural shocks and employing a four-variable structural vector auto-regression model, this paper investigated the dynamic trend of the feasibility for East Asian economies to form a currency union. The analysis of correlations of external supply shocks, domestic supply shocks, real demand shocks and monetary shocks (nominal shocks) with a sample period from 1980 to 2010 suggests that it is not reasonable for East Asia to form a single currency union currently in the entire region. However, a viable approach for regional monetary integration would be to start with smaller currency areas: Northeast Asian sub-region cluster including Japan, Korea, Taiwan and Hong Kong, and Southeast sub-regional cluster including Indonesia, Malaysia, Singapore and Thailand, and other economies might be included later. We can reasonably expect that the integration of these sub-regional currency areas may lead to a single currency in East Asia when a sufficient degree of economic convergence is achieved.
Poly[(μ4-benzene-1,3,5-tricarboxylato)bis(N,N-dimethylformamide)cerium(III)]
Zhongyue Li,Kun Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681102277x
Abstract: The asymmetric unit of the title rare earth coordination polymer, [Ce(C9H3O6)(C3H7NO)2]n, contains one eight-coordinated Ce3+ ion, one benzene-1,3,5-tricarboxylate (BTC) ligand and two coordinated N,N-dimethylformamide (DMF) molecules. The Ce3+ ion is coordinated by six O atoms from four carboxylate groups of the BTC ligands and by two O atoms from two terminal DMF molecules.
Poly[(μ4-benzene-1,3,5-tricarboxylato)bis(dimethyl sulfoxide-κO)neodymium(III)]
Zhongyue Li,Kun Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811049622
Abstract: The asymmetric unit of the title compound, [Nd(C9H3O6)(C2H6OS)2]n, contains one Nd3+ ion, one benzene-1,3,5-tricarboxylic ligand and two coordinating dimethyl sulfoxide molecules. The Nd3+ ion is coordinated by six O atoms from four carboxylate groups of the benzene-1,3,5-tricarboxylate ligands and two O atoms from two dimethyl sulfoxide molecules. The metal-organic cluster formed upon symmetry expansion of the asymmetric unit consists of two metal atoms and four benzene-1,3,5-tricarboxylate groups, creating a paddle-wheel-type building block arrangement. The remaining coordination sites are occupied by additional benzene-1,3,5-tricarboxylate groups and dimethyl sulfoxide molecules, forming a three-dimensional polymeric rare earth metal-organic framework structure.
A study of median frequencies of skeletal muscle undergoing Tuina intervention in patients with chronic fatigue syndrome
Kun-peng Liu
Zhong Xi Yi Jie He Xue Bao , 2011,
Abstract: Objective: To study the changes in median frequency (MF) from a surface electromyogram of skeletal muscles and functional assessment of chronic illness therapy (FACIT) figure scale scores for patients with chronic fatigue syndrome (CFS) before and after Tuina treatment. Methods: A controlled clinical trial was adopted. Thirty-two patients suffering from CFS were enrolled according to the inclusion criteria from outpatient department of Shanghai Yueyang Hospital of Integrated Chinese and Western Medicine in China; thirty normal people whose gender, age, height and body mass were concordant with the CFS patients were selected as the normal group. Surface electromyography was used to detect the median frequency (MF) of biceps, quadriceps, and waist and back muscle before and after a 20-day course of treatment. CFS patients also were asked to fill out the figure scale of FACIT to evaluate the degree of fatigue.Results: There was no significant difference in surface electromyography MF of myoelectric signal of biceps and quadriceps between CFS and normal person; however, the waist and back muscle MF of the normal person was significantly lower than that of the CFS patients. Before and after treatment, there were no obvious changes in the MF of myoelectric signals of all muscles. Tuina significantly decreased the scale score of FACIT.Conclusion: Tuina can improve the symptom of patients with CFS.
Analysis of 19 Cases of Primary Pulmonary Sarcoma
Kun LIU,Weimin LI
Chinese Journal of Lung Cancer , 2012, DOI: 10.3779/j.issn.1009-3419.2012.06.09
Abstract: Background and objective Primary pulmonary sarcoma (PPS) is a rare malignant tumor that originates from the mesenchymal tissue of the lungs. PPS is often easily misdiagnosed. This study aims to explore the clinical characteristics of PPS and provide a more comprehensive reference for the early diagnosis and treatment of this disease. Methods The 1996 to 2011 clinical data of 19 cases with PPS in West China Hospital were presented, along with literature review. Results A total of 19 patients, which include 12 males, were presented in this study. Patients with age between 41 and 68 years accounted for 57.9% (the mean age was 41 years). The main clinical manifestations were cough, expectoration, and hemoptysis. Based on the imaging results, spiculation was found in eight cases and lobulation in five cases. The main pathologic types were synovial sarcoma, leiomyosarcoma, and malignant fibrous histiocytoma. Seventeen patients underwent surgery, whereas one patient underwent chemotherapy. All 17 cases with a median survival of 18 months were investigated after being discharged (follow-up rate: 89.5%). Conclusion The clinical and imaging features of PPS are not characteristic. Thus, PPS is easily misdiagnosed and can cause high mortality among patients.
Gauss-Bonnet as effective cosmological constant
Liu Zhao,Kun Meng
Physics , 2011, DOI: 10.1088/0253-6102/57/4/15
Abstract: It is known that Gauss-Bonnet terms in higher dimensional gravity can produce an effective cosmological constant. We add extra examples to this picture by presenting explicitly two branches of accelerating vacuum solutions to the Einstein-Gauss-Bonnet gravities with a bare cosmological constant in 5 and 6 dimensions. Both branches of solutions are of constant curvature and the effective cosmological constants are independent of the acceleration parameter. One branch (the "-" branch) of the solutions is well defined in the limit when the Gauss-Bonnet parameter approaches zero, in which case the effective cosmological constant becomes identical with the bare value, while the other (i.e. the "+") branch is singular in the same limit, and beyond this singular limit, the effective cosmological constant is inversely proportional to the Gauss-Bonnet parameter with a negative constant of proportionality when the bare value vanishes.
Study on 3D Geological Model of Highway Tunnels Modeling Method  [PDF]
Kun ZHENG, Fang ZHOU, Pei LIU, Peng KAN
Journal of Geographic Information System (JGIS) , 2010, DOI: 10.4236/jgis.2010.21002
Abstract: Geology is the base for highways and tunnels construction. With the fast development of national highway construction, highway tunnel construction project are more and more complex. The completeness and accuracy are essential for the planning, design and construction of projects, while the ground information is quite poor in systematic, reliable and timely aspects. Therefore, the development of underground road tunnels, and the implementation of informationized spatial information management is urgent for highway construction. 3D geological tunnel model is intuitive, high efficient and convenience which greatly facilitates the maintenance and security of highway tunnels construction and it will be the trend for the future highway tunnel development.
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