acoustical properties of aerated autoclaved concrete

... Amplitude Amplitude The cutoff frequency of the filter is changed by making filter kernel wider or narrower. If a low-pass filter has a gain of one at DC (zero frequency), then the sum of all of the points ... cross-correlation of and cana[n](b[n] ' c[n] a[n] b[n] Chapter 7- Properties of Convolution 127 FIGURE 7-3 Example of calculus-like operations. The signal in (b) is the first difference of the signal ... the speed of DSP computers is often specified by how long it takes to preform a multiply-accumulate operation. If a signal composed of N samples is convolved with a signal composed of M samples,...

Ngày tải lên: 13/09/2012, 09:49

... the approach of deformation compatibility of beam for the analysis of the beams with large eccentricities by the additional assumption of an imaginary concrete strain at the portion of cable, ... before reaching the maximum value of Fig.6.12 Increase of cable stress of beam C1 Fig.6.13 Increase of cable stress of beam C2 0 200 400 600 800 1000 0 100 200 300 400 Applied ... the top surface of cross section. -123- i.e., the major part of stress increase in a cable will develop as the deflection of the beam becomes large. When the crushing of concrete happens...

Ngày tải lên: 07/11/2012, 11:04

... SCOPE OF THESIS 1.4.1 Objectives of thesis Although an extensive body of experimental studies has been conducted to understand the behavior of externally prestressed concrete beams, a method of ... behavior External cable Crushing of concrete External cable Non-prestressed reinforcement Crushing of concrete a) Shallow tied arch behavior b) Flexural behavior External cable Crushing of concrete External cable Non-prestressed reinforcement Crushing ... and scope of the present study as well as the organization of the course of study are defined and given at the end of this chapter. 1.1.1 Definition of post-tensioned prestressed concrete beams...

Ngày tải lên: 07/11/2012, 11:04

Ngày tải lên: 16/12/2012, 15:10

Ngày tải lên: 05/09/2013, 14:58

Ngày tải lên: 05/09/2013, 16:10

Ngày tải lên: 05/09/2013, 16:11

Ngày tải lên: 08/10/2013, 20:20

... maintain the hedge. 6.2 Proofs of the Properties Let fG k g n k=0 be a sequence of non-negative random variables such that each G k is F k -measurable. Define T k to be the set of all stopping times  satisfying k ... minfk ; V k = G k g: Proof: Recall the definition V 0 4 = max  2T 0 f IE 1 + r , G   = max  2T 0 V   0 Chapter 6 Properties of American Derivative Securities 6.1 The properties Definition ... + r , G  : The owner of the American derivative security can borrow this amount of money immediately, if he chooses, and invest in the market so as to exaclty pay off his debt as the payments fC j g n j...

Ngày tải lên: 18/10/2013, 03:20

... horizontal position of the apex of the pile – also, changing the sign of x changes that of the shear σ xz . More generally, the stress state of the jammed grain packing is assumed to be of the form σ xx = ... probably one of the issues that has been at the origin of the interest of many physicists for granular materials [359]. The last point of this subsection will be dedicated to the study of the stress ... Static properties of granular materials Fig. 14.6 Polar representation of the contact orientation distribution obtained in a numerical simulation of a granular layer prepared by a uniform ‘rain’ of...

Ngày tải lên: 01/11/2013, 08:20

... anaerobic, spores Clostridium spp Viruses  DNA or RNA  Shell of protein (capsid) surrounding nucleic acid  Classification on basis of nucleic acid  DNA viruses: eg Herpes simplex virus (HSV)  RNA ... Varicella zoster virus (VZV)  VZV: Chickenpox  VZV: Shingles  Re-activation of latent infection  Suppression of cell mediated immunity Fungi  Eukaryotes  Rigid chitinous cell walls  Antifungal ... unicellular, budding reproduction  eg Candida, Cryptococcus RNA viruses: Influenza Nature and Properties of Micro-organisms Laura JV Piddock Viruses  Obligate intracellular parasites  Use host...

Ngày tải lên: 12/12/2013, 17:15

Ngày tải lên: 17/12/2013, 15:19

... Inc. Æ À1 ¼1=5boundaryisoneinwhich1in5ofthegrainboundaryatoms match,asshowninFig.2.8(c). Twinboundariesmayformwithincrystals.Suchboundarieslieacross deformationtwinplanes,asshowninFig.2.8(d).Notethattheatomson eithersideofthetwinplanesaremirrorimages.Stackingfaultsmayalsobe formedwhentheperfectstackinginthecrystallinestackingsequenceis disturbed,Figs2.8(e)and2.8(f).Thesemaybethoughtofastheabsence ofaplaneofatoms(intrinsicstackingfaults)ortheinsertionofrowsof atomsthatdisturbthearrangementofatoms(extrinsicstackingfaults). IntrinsicandextrinsicstackingfaultsareillustratedschematicallyinFigs 2.8(e)and2.8(f),respectively.NotehowtheperfectABCABCstackingof atomsisdisturbedbytheinsertionorabsenceofrowsofatoms. 2.3.4VolumeDefects Volumedefectsareimperfectionssuchasvoids,bubble/gasentrapments, porosity,inclusions,precipitates,andcracks.Theymaybeintroducedintoa solidduringprocessingorfabricationprocesses.Anexampleofvolume defectsispresentedinFig.2.9.ThisshowsMnSinclusionsinanA707 steel.AnotherexampleofavolumedefectispresentedinFig.1.16(d). This ... approximately 0.3–0.5 of the melting temperature in degrees Kelvin. Since the evolution of microstructure is often controlled by diffusion processes, a brief introduction to elementary aspects of diffusion ... model of grain growth may be developed by using an analogy of growing soap bubbles. We assume that the growth of the soap bubbles (analogous to grains) is driven primarily by the surface energy of...

Ngày tải lên: 23/12/2013, 00:15

... Inc. 2 DefectStructureandMechanical Properties 2.1INTRODUCTION Sincethemechanicalbehaviorofsolidsisoftencontrolledbydefects,abrief reviewofthedifferenttypesofdefectsispresentedinthischapteralongwith theindicialnotationthatisoftenusedinthecharacterizationofatomic planesanddimensions.Thepossibledefectlengthscalesarealsodiscussed beforepresentingabriefintroductiontodiffusion-controlledphasetrans- formations.Finally,anoverviewofthemechanicalbehaviorofmaterialsis presentedinanefforttopreparethereaderformoredetaileddiscussionin subsequentchapters.Thematerialdescribedinthischapterisintendedfor thosewithlimitedpriorbackgroundintheprinciplesofmaterialsscience. Thebetterpreparedreadermay,therefore,choosetoskimthischapterand moveontoChap.3inwhichthefundamentalsofstressandstrainare presented. 2.2 ... macroscopic level of understanding of structure [Figs 16(a)–(d)]. They are often unaware of the atomic and micro- structural constituents that can affect the mechanical behavior of materials and of the ... mechanical properties of mate- rials. It is not intended to be a comprehensive review of all the different aspects of mechanical properties; such a task would be beyond the capabil- ities of any...

Ngày tải lên: 23/12/2013, 00:15

Ngày tải lên: 31/12/2013, 10:33

... and Optoelectronic Properties of Semiconductor Structures Jasprit Singh University of Michigan, Ann Arbor 1.3. Crystal Structure 11 Structure of the electronic de vice Structure of the optoelectronic ... techniques that allow modifications of electronic properties; use of alloys, quantum wells, strain and polar charge are discussed; iii) electron (hole) transport and optical properties of semiconductors and ... OEIC Substrate Substrate APPROACH Growth of the optoelectronic device structure Mask a portion of the layer Etch back Regrowth of the electronic device structure OEIC Figure 1.7: The importance of regrowth is clear...

Ngày tải lên: 24/01/2014, 17:34

... evaluate the psychometric properties of the generic quality of life (QoL) scale Child Health and Illness Profile-Child Edition (CHIP-CE) by means of a combined analysis of atomoxetine clinical trials in ... discussion of the impact of ADHD on QoL as measured by the CHIP-CE can be found elsewhere (Escobar et al. 2005, 2010). Internal psychometric properties of the CHIP-CE Missing values The proportion of ... et al. 123 ORIGINAL ARTICLE Psychometric properties of the quality of life scale Child Health and Illness Profile-Child Edition in a combined analysis of five atomoxetine trials Alexander Schacht • Rodrigo...

Ngày tải lên: 12/02/2014, 19:20

... current was turned off for a fixed duration t off of 0.5 s. During t on , FePt nanoparticles were deposited on the surface of the electrode When the current was switched off, an ultrasound ... magnetic properties with the saturation magnetization, µ 0 M s , of 1.4 T, the Currie temperature, T c , of 750 K, and the crystalline anisotropy K 1 , of 7 MJ/m 3 [2]. Despite the high cost of ... the potential benefit of combining sonochemistry with electrochemistry. Some of these beneficial effects include acceleration of mass transport, cleaning and degassing of the electrode surface,...

Ngày tải lên: 13/02/2014, 03:20

... increase up-spin of positions 2a and 2b. About the role of La to improve hard magnetic properties of hexagonal ferrite, the Vietnamese researchers have published a large number of publications ... fine particles, Digests of the ICF8, Kyoto, Japan (2000) 8. [4] M. Le Breton, et al. Intrinsic and magnetic Properties of La-Co substituted M-Type Hexa-Ferrites, Proc. of the ICF9, SanFrancisco, ... Magnetic Properties of La-Co substituted M-Type Sr-Ferrite ultrafine Powders prepared from citrate recursors, Proc. of the ICF9, SanFrancisco, California, USA (2004) 75. [9] L. Neél. Magnetic Properties...

Ngày tải lên: 13/02/2014, 03:20