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Extrapolation reconstruction of wind pressure fields on the claddings of high-rise buildings

Yehua SUN, Guquan SONG, Hui LV

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 653-666 doi: 10.1007/s11709-018-0503-5

Abstract: Here, we propose an improved proper orthogonal decomposition (POD) and Kriging method with a von Kármáncorrelation function to resolve this issue.Hence, the fluctuating wind fields have been characterized by the von Kármán correlation function, asan a priori function.

Keywords： extrapolation reconstruction     proper orthogonal decomposition     Kriging method     von Kármán function     Hurst    

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Experiment study on fatigue property of concrete filled steel pipe K-joints

Zhong Xingu,Yang Sheng,Shi Weihua

Strategic Study of CAE 2011, Volume 13, Issue 9,   Pages 97-100

Abstract: the truss arch of Xiangtan 4th Bridge, we made fatigue property test on concrete filled steel pipe K-jointsdifferent specifications, and calculated the amplitude of fatigue load of concrete filled steel pipe K-jointsassess fatigue life of concrete filled steel pipe, and fatigue property of concrete filled steel pipe K-jointswas obviously better than that of steel pipe K-joints.Moreover, the S—N curve of concrete filled steel pipe K-joints proposed by this paper would be

Keywords： concrete filled steel pipe K-joints     fatigue property     S—N curve    

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Cell carrier function of hollow-fiber membrane in rotating wall vessel bioreactor

SONG Kedong, LIU Tianqing, ZHAO Hu, LI Xiangqin, MA Xuehu, CUI Zhanfeng

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 34-39 doi: 10.1007/s11705-008-0022-3

Abstract: Moreover, von-Kossa staining and Alizarin Red S staining were carried out for mineralized nodules formation

Keywords： RWHMB     microcarrier     hematoxylin-eosin     von-Kossa staining     propitious    

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Enhancement of distillate output of double basin solar still with vacuum tubes

Hitesh N PANCHAL, P K SHAH

Frontiers in Energy 2014, Volume 8, Issue 1,   Pages 101-109 doi: 10.1007/s11708-014-0299-5

Abstract: Experiments were conducted in climate conditions of Mehsana (23.6000° N, 72.4000° E) Gujarat from April

Keywords： double basin solar still     calcium stones     pebbles     granite gravel     distillate output    

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Optimal design and development of PV-wind-battery based nano-grid system: A field-on-laboratory demonstration

TUDU, K. K. MANDAL, N. CHAKRABORTY

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 269-283 doi: 10.1007/s11708-018-0573-z

Abstract: The present paper has disseminated the design approach, project implementation, and economics of a nano-grid system. The deployment of the system is envisioned to acculturate the renewable technology into Indian society by field-on-laboratory demonstration (FOLD) and “bridge the gaps between research, development, and implementation.” The system consists of a solar photovoltaic (PV) (2.4 kWp), a wind turbine (3.2 kWp), and a battery bank (400 Ah). Initially, a prefeasibility study is conducted using the well-established HOMER (hybrid optimization model for electric renewable) software developed by the National Renewable Energy Laboratory (NREL), USA. The feasibility study indicates that the optimal capacity for the nano-grid system consists of a 2.16 kWp solar PV, a 3 kWp wind turbine, a 1.44 kW inverter, and a 24 kWh battery bank. The total net present cost (TNPC) and cost of energy (COE) of the system are US$20789.85 and US$0.673/kWh, respectively. However, the hybrid system consisting of a 2.4 kWp of solar PV, a 3.2 kWp of wind turbine, a 3 kVA of inverter, and a 400 Ah of battery bank has been installed due to unavailability of system components of desired values and to enhance the reliability of the system. The TNPC and COE of the system installed are found to be US$20073.63 and US$0.635/kWh, respectively and both costs are largely influenced by battery cost. Besides, this paper has illustrated the installation details of each component as well as of the system. Moreover, it has discussed the detailed cost breakup of the system. Furthermore, the performance of the system has been investigated and validated with the simulation results. It is observed that the power generated from the PV system is quite significant and is almost uniform over the year. Contrary to this, a trivial wind velocity prevails over the year apart from the month of April, May, and June, so does the power yield. This research demonstration provides a pathway for future planning of scaled-up hybrid energy systems or microgrid in this region of India or regions of similar topography.

Keywords： photovoltaic (PV)     wind     battery     nano-grid     hybrid optimization model for electric renewable (HOMER)     field-on-lab demonstration (FOLD)    

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Acid-treated carbon nanotubes and their effects on mortar strength

ELKASHEF,K. WANG,M. N. ABOU-ZEID

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 180-188 doi: 10.1007/s11709-015-0325-7

Abstract: In the present study, multi-walled carbon nanotubes (MWCNTs) were treated in an acidic mixture solution, made with nitric and sulfuric acids in a ratio of 3:1 by volume. The durations of the treatment were 100 and 180 min. The defects of these treated MWCNTs were examined using Raman spectroscopy. The attachment of hydroxyl functional groups to the walls of the MWCNTs were verified using FTIR spectroscopy. The dispersion of CNTs with acid treatment is assessed using UV-Vis spectroscopy and Scanning Electron Microscopy (SEM). The results indicate that the duration of the acid treatment has significant effect on both the degree of defects and functionality of the MWCNT. The compressive strength of mortar increased with the addition of the acid-treated MWCNTs; however, no appreciable difference was noted for the two treatment durations under this study.

Keywords： carbon nanotubes     concrete     composites     nanomaterials     cement    

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Morphological and mechanical characterization of a PMMA/CdS nanocomposite

Vishal MATHUR, Manasvi DIXIT, K.S. RATHORE, N. S. SAXENA, K.B. SHARMA

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 2,   Pages 258-263 doi: 10.1007/s11705-010-1014-7

Abstract: Thick film of poly(methyl methacrylate) (PMMA)/CdS nanocomposite have been synthesized by the solution casting process. The nanostructure of the CdS particles has been ascertained through the small angle X-ray scattering (SAXS) technique. The surface morphological characterization of the PMMA/CdS nanocomposite has been done through scanning electron microscopy (SEM) analysis. The variation of mechanical loss factor (Tan ) with temperature and tensile properties of prepared samples have been studied using Dynamic Mechanical Analyzer (DMA). This study reveals that the glass transition temperature ( ), Young’s modulus, and fracture energy of the PMMA/CdS nanocomposite are greatly influenced by the existence of interfacial energetic interaction between dispersed CdS nanoparticles and the matrix of PMMA.

Keywords： poly(methyl methacrylate) (PMMA)     filler nanoparticles     polymer semiconducting nanocomposite     tensile properties     glass transition temperature    

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Epidemiological study of a von Hippel-Lindau family in northwest China

Jingyao Zhang, Dapeng Wu, Hong Ai, Jigang Bai, Shunbin Dong, Qinling Yang, Kai Qu, Lei Zhou, Xinsen Xu, Chang Liu

Frontiers of Medicine 2013, Volume 7, Issue 3,   Pages 378-385 doi: 10.1007/s11684-013-0276-0

Abstract:

von Hippel-Lindau (VHL) disease is a rare, inherited neoplastic disease characterized by hemangioblastomas

Keywords： von Hippel-Lindau disease     epidemiology     family screening     pancreatic endocrine tumor    

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Flow, thermal, and vibration analysis using three dimensional finite element analysis for a flux reversal generator

VIDHYA,K. N. SRINIVAS

Frontiers in Energy 2016, Volume 10, Issue 4,   Pages 424-440 doi: 10.1007/s11708-016-0423-9

Abstract: This paper presents the simulation of major mechanical properties of a flux reversal generator (FRG) viz., computational fluid dynamic (CFD), thermal, and vibration. A three-dimensional finite element analysis (FEA) based CFD technique for finding the spread of pressure and air velocity in air regions of the FRG is described. The results of CFD are mainly obtained to fine tune the thermal analysis. Thus, in this focus, a flow analysis assisted thermal analysis is presented to predict the steady state temperature distribution inside FRG. The heat transfer coefficient of all the heat producing inner walls of the machine are evaluated from CFD analysis, which forms the main factor for the prediction of accurate heat distribution. The vibration analysis is illustrated. Major vibration sources such as mechanical, magnetic and applied loads are covered elaborately which consists of a 3D modal analysis to find the natural frequency of FRG, a 3D static stress analysis to predict the deformation of the stator, rotor and shaft for different speeds, and an unbalanced rotor harmonic analysis to find eccentricity of rotor to make sure that the vibration of the rotor is within the acceptable limits. Harmonic analysis such as sine sweep analysis to identify the range of speeds causing high vibrations and steady state vibration at a mode frequency of 1500 Hz is presented. The vibration analysis investigates the vibration of the FRG as a whole, which forms the contribution of this paper in the FRG literature.

Keywords： flux reversal generator     air velocity     computation fluid dynamics     thermal analysis     vibration analysis     finite element analysis    

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Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

K. MISHRA

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 420-440 doi: 10.1007/s11709-015-0305-y

Abstract: The von-Mises failure criterion has been used with isotropic hardening.

Keywords： XFEM     von-Mises yield criterion     isotropic hardening     fatigue crack growth     J-integral    

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The Strict Avalanche Criterion of Order k Spectral Properties of m-Valued Logical Functions

Guojinhui,LiShiqu

Strategic Study of CAE 2005, Volume 7, Issue 12,   Pages 45-48

Abstract: paper, in residue class ring Zm, the concept of the strict avalanche criterion of order kThen, by applying probabilistic thought and methods, the rule that a w-valued logical function fulfillsFinally, by Chrestenson cyclic spectrums, a necessary and sufficient condition on a m-valued logical functionis given, which fulfills the strict avalanche criterion of order k.

Keywords： m-valued logical function     Chrestenson cyclic spectrum     auto-correlation function     the strict avalanche    

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A novel method to investigate voltage stability of IEEE-14 bus wind integrated system using PSAT

Satish KUMAR,Ashwani KUMAR,N. K. SHARMA

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 410-418 doi: 10.1007/s11708-016-0440-8

Abstract: The maximum demand of power utilization is increasing exponentially from base load to peak load in day to day life. This power demand may be either industrial usage or household applications. To meet this high maximum power demand by the consumer, one of the options is the integration of renewable energy resources with conventional power generation methods. In the present scenario, wind energy system is one of the methods to generate power in connection with the conventional power systems. When the load on the conventional grid system increases, various bus voltages of the system tend to decrease, causing serious voltage drop or voltage instability within the system. In view of this, identification of weak buses within the system has become necessary. This paper presents the line indices method to identify these weak buses, so that some corrective action may be taken to compensate for this drop in voltage. An attempt has been made to compensate these drops in voltages by integration of renewable energy systems. The wind energy system at one of the bus in the test system is integrated and the performance of the system is verified by calculating the power flow (PF) using the power system analysis tool box (PSAT) and line indices of the integrated test system. The PF and load flow results are used to calculate line indices for the IEEE-14 bus test system which is simulated on PSAT.

Keywords： voltage stability     line indices     power system analysis tool box (PSAT)     wind system     line loading     power flow (PF)    

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Symbiotic performance, shoot biomass and water-use efficiency of three groundnut (

Sofiya K. MUHABA, Felix D. DAKORA

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 4,   Pages 455-466 doi: 10.15302/J-FASE-2020354

Abstract: Phosphorus supply markedly reduced shoot δ N values and increased the %Ndfa and amount of N-fixed, indicating the direct involvement of P in promoting N fixation in nodulated groundnut.The three genotypes differed significantly in δ N, %Ndfa, N-fixed, grain yield, C concentrationThe phosphorus × genotype interaction was also significant for shoot DM, N content, N-fixed andsoil N uptake.

Keywords： shoot yield     N-fixed     %Ndfa     δ15N     δ13C     water-use efficiency    

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Trajectory planning of mobile robots using indirect solution of optimal control method in generalized point-to-point task

N. RAHIMI, K. AMINI KHOIY

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1,   Pages 23-28 doi: 10.1007/s11465-012-0304-9

Abstract: problem, the nonlinear equations of the system are assumed as constraints, and a minimum energy objective function

Keywords： mobile robot     trajectory planning     nonlinear dynamic     optimal control    

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Effects of process parameters on surface roughness in abrasive waterjet cutting of aluminium

CHITHIRAI PON SELVAN, N. MOHANA SUNDARA RAJU, H. K. SACHIDANANDA

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4,   Pages 439-444 doi: 10.1007/s11465-012-0337-0

Abstract:

Abrasive waterjet cutting is a novel machining process capable of processing wide range of hard-to-cut materials. Surface roughness of machined parts is one of the major machining characteristics that play an important role in determining the quality of engineering components. This paper shows the influence of process parameters on surface roughness (Ra) which is an important cutting performance measure in abrasive waterjet cutting of aluminium. Taguchi’s design of experiments was carried out in order to collect surface roughness values. Experiments were conducted in varying water pressure, nozzle traverse speed, abrasive mass flow rate and standoff distance for cutting aluminium using abrasive waterjet cutting process. The effects of these parameters on surface roughness have been studied based on the experimental results.

Keywords： abrasive waterjet     aluminium     garnet     water pressure     mass flow rate     traverse speed     standoff distance    

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Title Author Date Type Operation

Extrapolation reconstruction of wind pressure fields on the claddings of high-rise buildings

Yehua SUN, Guquan SONG, Hui LV

Journal Article

Experiment study on fatigue property of concrete filled steel pipe K-joints

Zhong Xingu,Yang Sheng,Shi Weihua

Journal Article

Cell carrier function of hollow-fiber membrane in rotating wall vessel bioreactor

SONG Kedong, LIU Tianqing, ZHAO Hu, LI Xiangqin, MA Xuehu, CUI Zhanfeng

Journal Article

Enhancement of distillate output of double basin solar still with vacuum tubes

Hitesh N PANCHAL, P K SHAH

Journal Article

Optimal design and development of PV-wind-battery based nano-grid system: A field-on-laboratory demonstration

TUDU, K. K. MANDAL, N. CHAKRABORTY

Journal Article

Acid-treated carbon nanotubes and their effects on mortar strength

ELKASHEF,K. WANG,M. N. ABOU-ZEID

Journal Article

Morphological and mechanical characterization of a PMMA/CdS nanocomposite

Vishal MATHUR, Manasvi DIXIT, K.S. RATHORE, N. S. SAXENA, K.B. SHARMA

Journal Article

Epidemiological study of a von Hippel-Lindau family in northwest China

Jingyao Zhang, Dapeng Wu, Hong Ai, Jigang Bai, Shunbin Dong, Qinling Yang, Kai Qu, Lei Zhou, Xinsen Xu, Chang Liu

Journal Article

Flow, thermal, and vibration analysis using three dimensional finite element analysis for a flux reversal generator

VIDHYA,K. N. SRINIVAS

Journal Article

Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

K. MISHRA

Journal Article

The Strict Avalanche Criterion of Order k Spectral Properties of m-Valued Logical Functions

Guojinhui,LiShiqu

Journal Article

A novel method to investigate voltage stability of IEEE-14 bus wind integrated system using PSAT

Satish KUMAR,Ashwani KUMAR,N. K. SHARMA

Journal Article

Symbiotic performance, shoot biomass and water-use efficiency of three groundnut (

Sofiya K. MUHABA, Felix D. DAKORA

Journal Article

Trajectory planning of mobile robots using indirect solution of optimal control method in generalized point-to-point task

N. RAHIMI, K. AMINI KHOIY

Journal Article

Effects of process parameters on surface roughness in abrasive waterjet cutting of aluminium

CHITHIRAI PON SELVAN, N. MOHANA SUNDARA RAJU, H. K. SACHIDANANDA

Journal Article