نتایج جستجو برای: concrete shell

تعداد نتایج: 127825  

Journal: :Journal of High Energy Physics 2021

We consider the island formula for entropy of subsets Hawking radiation in adiabatic limit where evaporation is very slow. find a simple concrete `on-shell' generalized which involves image out stream radiation, `island stream'. The resulting recipe allows us to calculate quantum information properties and verify various constraints including Araki-Lieb inequality strong subadditivity.

Journal: :مهندسی عمران مدرس 0
محمدرضا بمانیان محمد رضا اخوت هانیه اخوت

abstract: appealing to the principle of vertical residence and stemming the horizontal expansion of the city, the tehran milad tower is being built on 35000 sm3 site with the total area of 220000 sm3. with a height of over 170m, this 56-story concrete building is in the final stages of construction and would be the highest residential building of iran. since tehran is located in a high-risk ear...

2016
Bing Liu Biqin Dong Ningxu Han Guangmin Zhu

In this study, a waterproof material was used to fabricate microcapsule by interfacial curing reaction to encapsulate an alkaliphilic spore-forming bacterium. The technical feasibility of encapsulated spores and the influence of three kinds of curing agent on the calcium precipitation activity (CPA) of the bacterium were studied. Furthermore, micromorphology of microcapsules was observed by Sca...

Journal: :Applied sciences 2022

Foamed concrete consists of cement matrix and air-foam has more complicated structure characteristics than normal concrete. However, current research on the elastic modulus foamed is still limited to empirical equations. In this work, a new theoretical prediction model was proposed for calculating The calculation spherical shell element constructed based Walsh formula assumption pores. Moreover...

2010
U. Johnson Alengaram Hilmi Mahmud Mohd Zamin Jumaat S. M. Shirazi

This paper presents information on the physical and mechanical properties of different sizes of palm kernel shells (PKS) used here as lightweight aggregates (LWA) and their influence on mechanical properties of palm kernel shell concrete (PKSC). Silica fume and fly ash were used as cementitious materials and all mixes had 1% superplasticizer on cement weight. It has been found that PKS consists...

2015
Wael I. Alnahhal

Abstract—It is a major challenge to build a bridge superstructure that has long-term durability and low maintenance requirements. A solution to this challenge may be to use new materials or to implement new structural systems. Fiber Reinforced Polymer (FRP) composites have continued to play an important role in solving some of persistent problems in infrastructure applications because of its hi...

Journal: :iranian journal of radiation research 0
s.m.j. mortazavi department of radiology, school of paramedical sciences, shiraz university of medical sciences, shiraz, iran m.a. mosleh-shirazi radiotherapy physics unit, radiotherapy department, namazee hospital, shiraz university of medical sciences, shiraz, iran m.r. maheri civil engineering department, school of engineering, shiraz university, shiraz, iran h. yousefnia department of nuclear engineering, school of engineering, shiraz university of medical sciences, shiraz, iran s. zolghadri department of nuclear engineering, school of engineering, shiraz university of medical sciences, shiraz, iran a. haji-pour civil engineering department, school of engineering, shiraz university, shiraz, iran

background: in megavoltage radiotherapy rooms, ordinary concrete is usually used due to its low construction costs, although higher density concrete are sometimes used, as well. the use of high-density concrete decreases the required thickness of the concrete barrier hence, its disadvantage is its high cost. in a nuclear reactor, neutron radiation is the most difficult to shield. a method for p...

2017
Kai Schneider Matthias Lieboldt Marco Liebscher Maik Fröhlich Simone Hempel Marko Butler Christof Schröfl Viktor Mechtcherine

Surfaces of carbon fibre roving were modified by means of a low temperature plasma treatment to improve their bonding with mineral fines; the latter serving as an inorganic fibre coating for the improved mechanical performance of carbon reinforcement in concrete matrices. Variation of the plasma conditions, such as gas composition and treatment time, was accomplished to establish polar groups o...

2007
W. Essmayr R. R. Wagner

The paper gives an overview on the meta-data specification for administrating and enforcing enterprisewide security for heterogeneous and distributed information systems. The meta-data serves as a basis to maintain enterprise-wide security information centrally, to integrate isolated security specifications, to keep the consistency between different security policies, and to perform access cont...

2000
Mihir Bellare Alexandra Boldyreva Silvio Micali

This paper addresses the security of public-key cryptosystems in a \multi-user" setting, namely in the presence of attacks involving the encryption of related messages under di erent public keys, as exempli ed by H astad's classical attacks on RSA. We prove that security in the single-user setting implies security in the multi-user setting as long as the former is interpreted in the strong sens...

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