fast fracture toughness and fatigue
Development of smoothed numerical methods for fracture analyses and interfacial toughness characterization in thin film systems
Ngày tải lên :
10/09/2015, 08:26
... strength and fracture toughness Elastic modulus and hardness can be easily measured by experimental methods, or it is possible to use the available data obtained from a bulk specimen The fracture toughness, ... earlier by Hutchinson and Suo [10], and further extended by Chen and Bull recently [11] Depending on the relative properties of film and substrate (hard brittle vs soft ductile), and the quality of ... or a structure, and not only ahead of a pre-existing crack tip [21] Later, Hutchinson and Suo [10], Tvergaard and Hutchinson [20], Allen and Searcy [22], Camanho et al [23], Xie and Waas [24],...
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Fracture toughness in rate dependent solids based on viod growth and coalescence mechanism
Ngày tải lên :
11/09/2015, 16:04
... steady-state fracture toughness in polymeric materials and metals (and alloys) at high temperature based on void growth and coalescence mechanism The time dependent behavior of polymeric materials and ... Steady-state toughness as a function of the crack velocity for f0 = 0.05 and σ /E = 0.02 (a) Elastic background material and rate-dependent fracture process zone (b) Rate-dependent background material and ... steady-state fracture toughness Γf intrinsic toughness of FPZ Γb extrinsic toughness of background K (|K|) applied stress intensity factor (Amplitude) Γ0 work of separation in the fracture process...
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Real-Time Digital Signal Processing - Chapter 7: Fast Fourier Transform and Its Applications
Ngày tải lên :
28/10/2013, 05:15
... the DTFT of periodic and finite-length sequences Example 7.1: If the signals fx
ng are real valued and N is an even number, we can show that X
0 and X
N=2 are real values and can be computed ... x(n) and h(n) are real-valued N-periodic sequences, y(n) is the circular convolution of x(n) and h(n) defined as y
n x
n h
n, n 0, 1, , N À 1,
7:1:26 312 FAST FOURIER TRANSFORM AND ... advantages, and disadvantages Each FFT has different strengths and makes different tradeoffs between code complexity, memory usage, and computation requirements The FFT algorithm introduced by Cooley and...
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Fast Food FACTS: Evaluating Fast Food Nutrition and Marketing to Youth ppt
Ngày tải lên :
07/03/2014, 00:20
... breakfast main dishes and breakfast sides (e.g., egg dishes, pancakes and hash browns) Some restaurants serve breakfast items all day and others serve these items only in the morning Breakfast ... websites, social and viral marketing, and mobile marketing; and within the restaurant, including indoor and outdoor signs, pricing and sales practices Fast food “product” classifications Fast food restaurants ... people who eat fast food consume more total fat, added sugars, and sugar-sweetened beverages, and less fiber, milk, and fruits and vegetables compared to children who not eat fast food.21-23...
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Evaluating Fast Food Nutrition and Marketing to Youth pot
Ngày tải lên :
24/03/2014, 02:20
... in eat fast food consume more calories, fat, sugar, and sugarsweetened beverages, and less fiber, milk, fruit and vegetables than peers who not eat fast food.1 If today’s youth consumed fast food ... 125 68 85 28 48 -1,723 The analyses Fast Food FACTS provides comprehensive and science-based information about fast food marketing practices and young people’s fast food purchases This study documents, ... comScore Inc., and Arbitron Inc on ad spending and youth exposure to ads on TV, radio and internet, and analyses of the content of these ads and social, viral and mobile marketing In-store marketing...
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Fast-Food Marketing and Children’s Fast-Food Consumption: Exploring Parents’ Influences in an Ethnically Diverse Sample doc
Ngày tải lên :
29/03/2014, 20:20
... constructs: (1) fast- food access, (2) exposure to fast- food promotion, (3) fast- food attitudes, (4) social norms about fast food, and (5) their children’s fast- food consumption We developed the fast- food ... Tables and show responses for parents’ reported exposure to fast- food promotions, access to fast- food restaurants, and attitudes and social norms, and Table shows the frequency of children’s fast- food ... convenient, and inexpensive food, fast- food outlets have become 223 a “home away from home for breakfast, lunch and dinner” among consumers of all ages (Kara, Kaynak, and Kucukemiroglu 1995, p 319) Fast- food...
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ultra fast laser absorption and ablation
Ngày tải lên :
06/05/2014, 09:02
... polarizer, F: 800-nm band-pass filter CHOWDHURY et al Ultra -fast laser absorption and ablation dynamics in wide-band-gap dielectrics locate the focal position at the imaging plane and hence also the ... force microscope (AFM) and the data is presented in Fig Each data point is averaged over five measurements and the error bars represent the standard deviation The larger band gap and corresponding ... the values of the band gaps of the three materials: 12 eV for CaF2 [7] and eV for SiO2 [17] and Al2 O3 [18] As the absorption is by nonlinear photoionization, the value of the band gap will determine...
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study the effect of welding joint location on the fatigue strength and fatigue life for steel weldment
Ngày tải lên :
24/05/2014, 20:35
... of the subject and the wide area of application, it is not surprising that several approaches for fatigue analysis of welded joints toughness and fatigue strength [4] The aim and scope : The ... welding joint on the fatigue life and fatigue strength of rotating steel shaft and finding the best location for welding joint The scope of this work is applied mechanics and the design of welding ... E467) for the fatigue The samples of experimental work for tensile and fatigue tests were cutting from steel that had Table.1 Chemical composition of steel samples (tensile and fatigue sample)...
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Báo cáo hóa học: " Research Article A Two-Layered Mobility Architecture Using Fast Mobile IPv6 and Session Initiation Protocol" pot
Ngày tải lên :
22/06/2014, 19:20
... established to send and receive data packets 2.2 Predictive handover—FMIPv6 A predictive-determined handover is when the MN is responsible for defining and initiating the handover prior to the handover as ... 2 EURASIP Journal on Wireless Communications and Networking 2.1 Fast handover for Mobile IPv6 Fast handovers for Mobile IP protocol proposed by the Mobile IP working group ... IP-based handoff management from network layer fast Mobile IP and SIP at the application layer In that way, it will allow intrinsic connections between low-level and high-level mobility The aim of fast...
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Báo cáo hóa học: " Fast Motion Estimation and Intermode Selection for H.264" pptx
Ngày tải lên :
22/06/2014, 23:20
... 6, and as candidate modes Yes For each 16 ¢ 16 sub-MB, check if it is homogeneous No Select intermodes 2, 3, and as candidate modes Yes Select mode Perform ME and intermode decision using candidate ... Circuits and Systems for Video Technology, vol 12, no 5, pp 349–355, 2002 [8] Z Chen and Y He, Fast Integer and Fractional Pel Motion estimation,” Joint Video Team (JVT) of ISO/IEC MPEG and ITU-T ... system, the profile and level are constrained due to the limited memory size, low computing power, and narrow bandwidth of the mobile network, In general, H.264 baseline profile (BP) and level 3.0 or...
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Báo cáo vật lý: "Effect of Filler Incorporation on the Fracture Toughness Properties of Denture Base Poly(Methyl Methacrylate)" pptx
Ngày tải lên :
07/08/2014, 14:20
... base resins with the results from fracture toughness tests and showed that impact testing is influenced by loading conditions and specimen geometry Fracture toughness tests may be more suitable ... electrostatic charging and obtain better image resolution RESULTS AND DISCUSSION 3.1 Fracture Toughness (KIC ) Fractures in an acrylic denture base are a common clinical problem Fatigue failure does ... weak correlation between fracture toughness and filler content They observed that although the filler type, distribution and composition had a strong effect on fracture toughness, the properties...
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Báo cáo y học: "Rhinorrhea, cough and fatigue in patients taking sitagliptin" docx
Ngày tải lên :
08/08/2014, 21:20
... cough, dyspnea, and fatigue symptoms scores (0 to 10 ordinal scales with = none and 10 = worst in life) were assessed by the physician at the visit when sitagliptin was stopped, and by the patient ... Demographics, treatments and responses for the sitagliptin intolerant and tolerant groups Treatments were metformin (Met), sulfonylureas (SU) and insulin (* Cases 16 and 18 were treated with ... Symptoms persisted for months into the winter and resolved within a week of stopping sitagliptin Anterior and/ or posterior rhinorrhea, fatigue, cough and the sensation of wheezing or dyspnea developed...
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báo cáo khoa học: " A systematic review of the effectiveness of interventions to improve post-fracture investigation and management of patients at risk of osteoporosis" docx
Ngày tải lên :
10/08/2014, 10:23
... risk of fracture [21-23], and drug treatments have been shown to significantly reduce the rates of subsequent fragility fractures, even in individuals with advanced bone loss and prevalent fractures ... patients with a hip fracture [46,48,49,53], three on fractures of the wrist/distal forearm [51,52,54], and two included several fracture sites consistent with a fragility fracture [47,50] One ... months and sustained a N = 327 study defined fracture Age range = (any clinical fracture 50-89 years except skull, facial, finger, 100% female toe, ankle or any open fracture) Content and method...
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Báo cáo y học: " Environmental exposures and their genetic or environmental contribution to depression and fatigue: a twin study in Sri Lanka" potx
Ngày tải lên :
11/08/2014, 16:22
... measured environmental exposures (early school leaving, standard of living, life events, and parental care) and their link with depression and fatigue in Sri Lanka, in order to examine the degree ... within-pair difference in fatigue from within-pair differences in environments), and familiality (’A’ and ‘C’) (predicting fatigue from co-twin’s environmental experiences, in both MZ and DZ pairs) Familiality: ... between measured exposures and fatigue or depression outcome looked for correlations between genes and environments, our assessment of the heritability of depression and fatigue did not assess potential...
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Báo cáo y học: " Biomarkers of systemic inflammation and depression and fatigue in moderate clinically stable COPD" pdf
Ngày tải lên :
12/08/2014, 13:22
... Manchester COPD fatigue scale (MCFS) which has a high level of validity and reliability [7] It measures total fatigue as well as dimensional assessment of physical, cognitive and psychosocial fatigue ... of fit test and non-parametric data were natural log transformed or presented as median and interquartile range (IQR) The univariate correlation of biomarkers and depression and fatigue scores ... of systemic biomarkers and depression and fatigue The multivariate linear and binary regression analyses were used to examine the association of factors with depression or fatigue SPSS version...
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Effect of Fracture Dip and Fracture Tortuosity on Petrophysical Evaluation of Naturally Fractured Reservoirs
Ngày tải lên :
04/10/2014, 22:10
... combinations of matrix and fractures or matrix and nonconnected vugs The non-connected vugs and matrix equations were validated using core data published by Lucia.8 The fractures and matrix equations ... account variations in fracture dip and fracture tortuosity can lead in some cases to significant errors in the calculations of the dual porosity exponent, m, of matrix and fractures; and water saturation ... inverse of conductivity, equations A-2 and A-3 can be re-written in more standard oil and gas notation as: Roθ = 90 − mb Equations A-9 and A-10 assume that the fracture porosity exponent, mf, is...
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integration of fracture, reservoir and geomechanic Modeling for shale gas reservoir development
Ngày tải lên :
04/10/2014, 22:11
... approach: fracture, reservoir, and geomechanics analysis and modeling Fracture pressure analysis and fracture modeling were conducted to estimate the number of propagating fractures in a stage and ... the timing, well placement and fracture strategy of infill wells, (2) the timing and fracture strategy for refracture candidates, or (3) the timing, well placement, and fracture strategy for new ... to infer fracture- tofracture and well-to-well interference Using information from production data analysis and fracture height, EUR, and drainage area are calculated from type curves and numerical...
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Animal silks fracture mechanism and formation mechanism
Ngày tải lên :
10/09/2015, 09:04
... silkworm silk and spider silk 1.2 Hierarchical structure of spider and silkworm silk 1.3 The mechanical properties of silk and previous modeling studies 1.4 The application of silk and the ... fibers The solid and hollow circles indicate the f, nβ , A values from silkworm and spider silks, respectively .39 Figure 2.9 Fracture of (a) the Bulk Network (BN) model and (b) the Slippery ... silk and spider silk Silkworm silk and spider silk are two of the most widely studies species of animal silks Silkworm silk is a natural protein fiber, which is composed of fibroin and sericin, and...
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Smoothed methods for fracture problems and application to composite materials
Ngày tải lên :
10/09/2015, 09:23
... Kureemun and Mr Mohammad Ravandi for their help and friendship during my last two and a half years in Impact and Strength lab To my parents, my sister and brother, I appreciate their support and encouragement ... methods are usually used for fracture and fatigue analysis of structures In this thesis, smoothing technique is applied to develop numerical methods for fracture mechanics and the application of smoothed ... solutions The plastic stress and strain fields around the crack tip for power hardening material, which are singular as r approaches zero, are crucial to fracture and fatigue of structures Traditional...
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Muscle force estimation and fatigue detection based on sEMG signals
Ngày tải lên :
10/09/2015, 09:23
... clinical side and detecting the occurrence of fatigue Very little research is carried out on detecting muscle fatigue in real-time and tracking the continuous muscle state from non -fatigue to fatigue ... muscle weakness and fatigue So far, little is known concerning the changes in neuromuscular fatigue after stroke In the following sections, the general definition of fatigue and fatigue physiological ... been extended to three types, non -fatigue, transition-to -fatigue, and fatigue [107] Most of developed fatigue detection approaches have accomplished efficient fatigue assessment However, many...
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