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Peak Pressures Acting on Tall Buildings with Various Configurations
Bandi, Eswara Kumar,Tanaka, Hideyuki,Kim, Yong Chul,Ohtake, Kazuo,Yoshida, Akihito,Tamura, Yukio Council on Tall Building and Urban Habitat Korea 2013 International journal of high-rise buildings Vol.2 No.3
Twenty six pressure models of high rise buildings with various cross-sections including twisted models were tested in a boundary layer wind tunnel. The cross-sections were triangular, square, pentagon, hexagon, octagon, dodecagon, circular, and clover. This study investigates variations in peak pressures, and effects of various cross-sections and twist angles on peak pressures. To study the effects of various configurations and twist angles on peak pressures in detail, maximum positive and minimum negative peak pressures at each measurement point of the building for all wind directions are presented and discussed. The results show that peak pressures greatly depend on building cross-section and twist angle.
MHD non similar flow and heat transfer with an exponentially decreasing velocity distribution
K. R. Jayakumar,A. T. Eswara 장전수학회 2014 Proceedings of the Jangjeon mathematical society Vol.17 No.4
MHD non similar flow and heat transfer with an exponentially decreasing velocity distribution
Kumar, P. Ramesh,Kollu, Pratap,Santhosh, Chella,Eswara Varaprasada Rao, K.,Kim, Do Kyung,Grace, Andrews Nirmala The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.8
<P>Porous CoFe<SUB>2</SUB>O<SUB>4</SUB> nanoclusters with different concentrations of graphene based composites were synthesized by a simple solvothermal process. The electrochemical properties of prepared CoFe<SUB>2</SUB>O<SUB>4</SUB>–reduced graphene oxide (rGO) composites were evaluated using polyvinylidene fluoride and Na-alginate as binder materials. The CoFe<SUB>2</SUB>O<SUB>4</SUB> + 20% rGO composite with alginate exhibited a high stable capacity of 1040 mA h g<SUP>−1</SUP> at 0.1 C (91 mA g<SUP>−1</SUP>) rate with excellent rate capability. The observed enhancement in electrochemical properties of the CoFe<SUB>2</SUB>O<SUB>4</SUB> + 20% rGO composite with alginate is due to the high stability and good transportation network while charging–discharging.</P> <P>Graphic Abstract</P><P>Porous CoFe<SUB>2</SUB>O<SUB>4</SUB> nanoclusters with different concentrations of graphene based composites were synthesized by a simple solvothermal process. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00419a'> </P>
B. V. Ramana Reddy,A. Suresh,K.V.Subbaiah,Dr.B. Eswara Reddy 보안공학연구지원센터 2009 International Journal of Hybrid Information Techno Vol.2 No.4
Study of different patterns on a local neighborhood of a texture plays an important role in characterization, and classification of the textures. The present paper proposes a method for measuring the occurrence factor of patterns on a randomly thresholded binary image. For this process eight simple patterns are chosen on a 3×3 neighborhood. The simple patterns are chosen in such a way that any complex pattern can be formed by grouping one or more of these simple patterns. The pattern occurrence factor of different binary images is also compared with the actual binary texture image. The experimental results on sixty four textures indicate good comparison of variation of occurrence in these patterns on different binary images of random threshold
Aerodynamic and Flow Characteristics of Tall Buildings with Various Unconventional Configurations
Tanaka, Hideyuki,Tamura, Yukio,Ohtake, Kazuo,Nakai, Masayoshi,Kim, Yong Chul,Bandi, Eswara Kumar Council on Tall Building and Urban Habitat Korea 2013 International journal of high-rise buildings Vol.2 No.3
Tall buildings have been traditionally designed to be symmetric rectangular, triangular or circular in plan, in order to avoid excessive seismic-induced torsional vibrations due to eccentricity, especially in seismic-prone regions like Japan. However, recent tall building design has been released from the spell of compulsory symmetric shape design, and free-style design is increasing. This is mainly due to architects' and structural designers' challenging demands for novel and unconventional expressions. Another important aspect is that rather complicated sectional shapes are basically good with regard to aerodynamic properties for crosswind excitations, which are a key issue in tall-building wind-resistant design. A series of wind tunnel experiments and numerical simulation have been carried out to determine aerodynamic forces and wind pressures acting on tall building models with various configurations: corner cut, setbacks, helical and so on. Dynamic wind-induced response analyses of these models have also been conducted. The results of these experiments have led to comprehensive understanding of the aerodynamic characteristics of tall buildings with various configurations.
Development of Advanced Knitted Structures for Base Layer Clothing for Glacier Regions
B. R. Das,D. K. Yadav,M. K. Singh,T. H. Goswami,N. Eswara Prasad 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7
The principal objectives of the present work were to improve thermo-physiological comfort and other essentialfunctional features of the existing material. Several important thermo-physiological comfort characteristics, such as thermalresistance, air permeability and water vapour permeability in addition to the other essential functional features like burstingstrength, surface resistivity, ultraviolet (UV) radiation protection and colour fastness to washing and perspiration of theknitted fabrics, which were developed for application in glacier regions were evaluated. These evaluated properties arediscussed and also compared with existing Base Layer Clothing (BLC) for the selection of the best material for up-gradationof the same for soldiers deployed in glacier regions. Statistical analysis is carried out at 95 % significance level for differentfunctional features to establish the specific trend exhibited by the knitted fabrics. While the existing BLC is made ofpolypropylene knitted fabric, the improved versions proposed in the present study were developed with polyester/lycra andblend of polyester/lycra and polypropylene/lycra knitted fabrics, made in terry pile (uncut) knit design. The characterizationof different yarns used in preparation of these newer and existing knitted structures was carried out by analyzing theirrespective FTIR spectrums. The knitted structure made with blend of polyester/lycra and polypropylene/lycra was found tobe superior in terms of thermal insulation, warm/cool sensation, water vapour permeability and surface resistivity. Severalprototypes of BLC with both existing and modified materials were also fabricated, evaluated and the same are proposed forUser Trials to bring out unambiguously the valuable merits and demerits.
단면의 변의 수가 초고층 건물의 공력특성에 미치는 영향
김용철,반디 에스와라 쿠마,유키오 타무라,요시다 아키히또,윤성원,Kim, Yong-Chul,Bandi, Eswara Kumar,Tamura, Yukio,Yoshida, Akihito,Yoon, Sung-Won 한국공간구조학회 2013 한국공간구조학회지 Vol.13 No.3
A series of wind tunnel tests were conducted on 7 super-tall buildings with various polygon cross-sections, including triangle, square, pentagon, hexagon, octagon, dodecagon, and circular. The primary purpose of the present study is to investigate the effect of increasing number of sides on aerodynamic characteristics for super-tall buildings. Wind tunnel tests were conducted under the turbulent boundary layers whose power-law exponent is 0.27. Fluctuating wind pressures from more than 200 pressure taps were recorded simultaneously, and time series of overturning moments were calculated considering tributary area of each pressure tap. The results show that the overturning moment coefficients and the spectral values decrease with increasing number of sides, and the largest mean and fluctuating overturning moments were found for the triangular super-tall building, and the largest spectral values were found for the square super-tall building. The analysis should be conducted more in detail, but currently it can be roughly said that there seems to be a little differences in the aerodynamic characteristics for the super-tall buildings whose number of sides is larger than 5 or 6.