دانلود و نمایش مقالات مرتبط با شکست::صفحه 1
دانلود بهترین مقالات isi همراه با ترجمه فارسی 2

با سلام خدمت کاربران در صورتی که با خطای سیستم پرداخت بانکی مواجه شدید از طریق کارت به کارت (6037997535328901 بانک ملی ناصر خنجری ) مقاله خود را دریافت کنید (تا مشکل رفع گردد). 

نتیجه جستجو - شکست

تعداد مقالات یافته شده: 260
ردیف عنوان نوع
1 The physical and mechanical properties for flexible biomass particles using computer vision
خواص فیزیکی و مکانیکی ذرات زیست توده انعطاف پذیر با استفاده از بینایی کامپیوتری-2022
The combustion and fluidization behavior of biomass depend on the physical properties (size, morphology, and density) and mechanical performances (elastic modulus, Poisson’s ratio, tensile strength and failure strain), but their quantitative models have rarely been focused in previous researchers. Hence, a static image measurement for particle physical properties is studied. Combining the uniaxial tension and digital image correlation tech- nology, the dynamic image measurement method for the mechanical properties is proposed. The results indicate that the average roundness, rectangularity, and sphericity of present biomass particles are 0.2, 0.4, and 0.16, respectively. The equivalent diameter and density obey the skewed normal distribution. The tensile strength and failure stress are sensitive to stretching rate, fiber size and orientation. The distribution intervals of elastic modulus and Poisson’s ratio are 30–600 MPa and 0.25–0.307, respectively. The stress–strain curves obtained from imaging experiments agree well with the result of finite element method. This study provides the operating parameters for the numerical simulation of particles in the fluidized bed and combustor. Furthermore, the computer vision measurement method can be extended to the investigations of fossil fuels.
keywords: ذرات زیست توده | مشخصات فیزیکی | اجرای مکانیکی | تست کشش | آزمایش تصویربرداری | بینایی کامپیوتر | Biomass particle | Physical properties | Mechanical performances | Tensile testing | Imaging experiment | Computer vision
مقاله انگلیسی
2 Framing accounting for goodwill: Intractable controversies between users and standard setters
فریم کردن حسابداری برای حسن نیت: اختلافات قابل انعطاف بین کاربران و برنامه های استاندارد-2021
How to account for goodwill arising from business combinations has proven to be one the most controversial topics for the standardisation, preparation, and audit of financial reports. Given its contested nature, and recent debates about improper goodwill accounting by failing companies, standard setters are currently reconsidering existing recognition, measurement, and disclosure requirements. In this study, we explore the views of a relatively neglected group of stakeholders in the financial reporting policy-making arena – financial statement users. We draw on empirical evidence from interviews with financial analysts and from responses by analysts to IASB and EFRAG consultations. We mobilise framing theory as used in public policy studies to analyse how users make sense of goodwill accounting information as compared to standard setters. Our key finding is the plurality of colliding frames between users and standard setters that remain intractable. Our analysis reveals that users’ interest in management’s accountability on acquisi- tions cannot fit easily into the financial reporting frame. Not only are claims by standard setters about the value relevance of goodwill impairments found not to be experienced in practice, but also we discover that users question the benefits of standard setters working in this area, while they take recourse to ‘street numbers’ for their analysis. We interpret the intractability we discover as putting into question public policy claims that accounting policies are developed with a commitment to serve the public interest.
keywords: IFRS | حسن نیت | آنالیز مالی | کادر بندی | IFRS | Goodwill | Financial analysis | Framing
مقاله انگلیسی
3 The role of peripheral ocular length and peripheral corneal radius of curvature in determining refractive error
نقش طول چشم محیطی و شعاع انحنای قرنیه محیطی در تعیین خطای شکست-2021
Purpose: The purpose of this study was to extend the knowledge of peripheral biometric component and its relationship to refractive status in healthy individuals by determining the correlation between peripheral ocular length to peripheral corneal radius ratio and the refractive error.
Methods: This prospective study was conducted on thirty-three healthy adult participants. Refractive error was assessed objectively and subjectively and recorded as the mean spherical equivalent. Central and peripheral ocular lengths at 30◦ were assessed using partial coherence interferometry under dilation with 1% tropicamide. Central and peripheral corneal radius of curvature was assessed using Scheimpflug topography. Peripheral ocular lengths at 30◦ were paired with peripheral corneal curvatures at the incident points of the IOLMaster beam (3.8 mm away from corneal apex) superiorly, inferiorly, temporally and nasally to calculate the peripheral ocular length-peripheral corneal radius ratio. Descriptive statistics were used to describe the distribution and spread of the data. Pearson’s correlation analysis was used to present the association between biometric and refractive variables.
Results: Refractive error was negatively correlated with the axial length-central corneal radius ratio (r = −0.91; p < 0.001) and with 30◦ peripheral ocular length-peripheral corneal radius ratio in all four meridians (r ≤ −0.76; p < 0.001). The strength of the correlation was considerably lower when only axial length or peripheral ocular lengths were used.
Conclusion: Using the ratios of peripheral ocular length-peripheral corneal radius to predict refractive error is more effective than using peripheral corneal radius or peripheral ocular length alone.
KEYWORDS: Refractive error | Myopia | Peripheral ocular length | Peripheral corneal radius of curvature | Axial length
مقاله انگلیسی
4 Refraction seismic complementing electrical method in subsurface characterization for tunneling in soft pyroclastic, (a case study)
روش الکتریکی تکمیلی لرزه‌ای شکست در شناسایی زیرسطحی برای تونل‌زنی در آذرآواری نرم (مطالعه موردی)-2021
The paper highlights the potential drawback of mapping a single geophysical property for subsurface characterization in potential engineering sites. As an exemplary case study, we present the geophysical survey conducted along the surface projection of a tunnel in the quaternary volcanic terrain of the Main Ethiopia Rift. Initially, geoelectrical mapping involving 12 Vertical Electrical Sounding (VES) and a short Electrical Resistivity Imaging (ERI) line, was carried out. The 1D geoelectric model indicates that the formation resistivity at tunnel zone varies from 50 to 500 Ω∙m. The corresponding value on 2D model, (>350 Ω∙m), is also compatible. Based on limited available geological information, the geoelectric horizon was attributed to weathered and variably saturated ignimbrite. Following unexpected encounter during excavation, refraction seismic and core drilling were carried out for additional insights. Tomographic analysis of the seismic arrival times revealed that below a depth of 45 m, (tunnel zone), the velocity substratum is marked by a range, (1200–1800 m/s). Such low velocity range is typical of unconsolidated materials and, thus, cannot rationalize the geoelectrical attribution (ignimbrite). In a joint interpretation, the likely formation that may justify the observed range of the electrical resistivity and low P-wave velocity appears to be unwelded pyroclastic deposit (volcanic ash). Eventually, core samples from the tunnel zone confirmed the presence of thick ash flow. However, the unexpected ground conditions encountered at the early phase, due to insufficient information derived from a single geophysical parameter, caused extra cost and considerable delay.
Keywords: Integrated approach | Refraction seismic | DC resistivity | Subsurface characterization | Main Ethiopian Rift (MER)
مقاله انگلیسی
5 Construction of carbonate reservoir knowledge base and its application in fracture-cavity reservoir geological modeling
ساخت پایگاه دانش مخزن کربناته و کاربرد آن در مدلسازی زمین شناسی مخزن شکستگی-حفره ای-2021
To improve the efficiency and accuracy of carbonate reservoir research, a unified reservoir knowledge base linking geological knowledge management with reservoir research is proposed. The reservoir knowledge base serves high-quality analysis, evaluation, description and geological modeling of reservoirs. The knowledge framework is divided into three categories: technical service standard, technical research method and professional knowledge and cases related to geological objects. In order to build a knowledge base, first of all, it is necessary to form a knowledge classification system and knowledge description standards; secondly, to sort out theoretical understandings and various technical methods for different geologic objects and work out a technical service standard package according to the technical standard; thirdly, to collect typical outcrop and reservoir cases, constantly expand the content of the knowledge base through systematic extraction, sorting and saving, and construct professional knowledge about geological objects. Through the use of encyclopedia based collaborative editing architecture, knowledge construction and sharing can be realized. Geological objects and related attribute parameters can be automatically extracted by using natural language processing (NLP) technology, and outcrop data can be collected by using modern fine measurement technology, to enhance the efficiency of knowledge acquisition, extraction and sorting. In this paper, the geological modeling of fracture-cavity reservoir in the Tarim Basin is taken as an example to illustrate the construction of knowledge base of carbonate reservoir and its application in geological modeling of fracture-cavity carbonate reservoir.
keywords: knowledge management | reservoir knowledge base | fracture-cavity reservoir | geological modeling | carbonates | paleo-underground river system | Tahe oilfield | Tarim Basin
مقاله انگلیسی
6 Local knowledge of emerging hazards: Instability above an Icelandic glacier
دانش محلی از خطرات در حال ظهور: بی ثباتی بالاتر از یخچال های ایسلندی-2021
Climate change is contributing to shifts in the magnitude and scale of hazards, and the emergence of risks in areas where they were previously unknown. In south-east Iceland, a fracture in the mountainside of Svínafellsheiði threatens to cause between 60 and 100 million cubic metres of rock to fall onto the glacier below. A large landslide could break up the surface of the glacier, crash into the proglacial lake, and affect people and infrastructure downhill. In addition to the unprecedented scale, the Svínafellsheiði fracture represents the first time people and infrastructure have been exposed to this type of hazard in Iceland. In this article we examine the role of local knowledge in disaster risk reduction and management for communities that are facing a particular type of hazard for the first time. We argue that even when a community lacks experience with a specific type of hazard, local knowledge can still play a valuable role in hazard identification and risk management.
keywords: کاهش خطر و مدیریت خطر فاجعه | دانش محلی | رانش زمین | ایسلند | خطر ظهور | Svínafellsheiði | Disaster risk reduction and management | Local knowledge | Landslide | Iceland | Emerging hazard
مقاله انگلیسی
7 Learning from past earthquake disasters: The need for knowledge management system to enhance infrastructure resilience in Indonesia
یادگیری از بلایای زلزله گذشته: نیاز به سیستم مدیریت دانش برای افزایش انعطاف پذیری زیرساخت در اندونزی-2021
Indonesia lies at the region where Indo-Australian, Eurasian, Pacific and Philippines global tectonic plates meet. In the last 30 years, Indonesia has experienced catastrophic earthquake disasters, causing thousands of loss of life and major infrastructure damage. Since the 2004 devastating Sumatra-Andaman tsunamigenic earthquake, knowledge derived from various disaster experiences regarding infrastructure resilience have been improving. Yet disasters such as the recent 2018 Lombok and Palu earthquakes remain devastating. An investigation on how knowledge on past earthquakes have been managed and utilized to promote better resilient infrastructure in Indonesia is conducted. Lessons are extracted from 5 significant earthquakes causing major damage through compilation and analysis of scientific publications and reports on field surveys, works and existing policies. Factors that keep contributing to the failure of buildings and infrastructure include lack of understanding of local hazard situation, incompliance to seismic resistant codes and standards for buildings and infrastructure, prob- lematic soil condition, and collateral hazards such as tsunami, liquefaction, ground subsidence, landslides, rock avalanche which are adding to the complexity of the seismic hazard. The scarcity of information and knowledge on the performance on resilience of infrastructure during earthquakes in Indonesia limits knowledge-based de- cision making in the planning, development and operation of resilient infrastructure. This study calls for the development of a knowledge management system for earthquake resilient infrastructure in Indonesia, to save more lives and to reduce economic disruptions due to infrastructure damages, and thus contribute to the sus- tainable development goals achievement.
keywords: زیرساخت های انعطاف پذیر | سیستم مدیریت دانش | زمين لرزه | کاهش خطر | Resilient infrastructure | Knowledge management system | Earthquake | Risk reduction
مقاله انگلیسی
8 How viable is password cracking in digital forensic investigation? Analyzing the guessability of over 3:9 billion real-world accounts
شکستن رمز عبور در تحقیقات پزشکی قانونی دیجیتال چقدر قابل اجرا است؟ تجزیه و تحلیل قابلیت حدس زدن بیش از 3:9 میلیارد حساب در دنیای واقعی-2021
Passwords have been and still remain the most common method of authentication in computer systems. These systems are therefore privileged targets of attackers, and the number of data breaches in the last few years attests to that. A detailed analysis of such data can provide insight on password trends and patterns users follow when they create a password. To this end, this paper presents the largest and most comprehensive analysis of real-world passwords to date e associated with over 3.9 billion accounts from Have I Been Pwned. This analysis includes statistics on use and most common patterns found in passwords and innovates with a breakdown of the constituent fragments that make each password. Furthermore, a classification of these fragments according to their semantic meaning, provides insight on the role of context in password selection. Finally, we provide an in-depth analysis on the guessability of these real-world passwords.
keywords: Password security | Password-based authentication | Context-based password cracking | Password strength meters
مقاله انگلیسی
9 Revised notched coating adhesion test to account for plasticity and 3D behaviour
تست چسبندگی پوشش بریدگی اصلاح شده برای محاسبه انعطاف پذیری و رفتار سه بعدی-2021
Specialized polyamide-imide coating on a CuSn10Pb10 substrate, a material combination utilized often in modern bearing applications, is fabricated using the solvent casting method. The coating adhesion is studied using the well-known notched coating adhesion (NCA) test. Conventionally, the critical strain required to cause the debond propagation is determined by visual observation and indirectly linked to measured strain data to calculate fracture toughness. Here, digital image correlation (DIC) is used to systemically study the coating deformations during testing that enables quantitative determination of the instantaneous debond length. With the introduced method, the critical strain to induce the debond of the coating and the propagation of the debond can be determined for non-elastically behaving specimens reliably. The coating’s debond onset is studied with virtual crack closure technique (VCCT) here. The method can take 3D effects into account in detail and provides a sophisticated method to determine the critical energy release rate. Additionally, cohesive zone modelling (CZM) is used to simulate debond progression. Nonlinear stress–strain responses are observed taking place both with the coating and the substrate materials. The results emphasize that the coating plasticity has a remarkable role in the test behaviour which needs to be taken into account in the revised analysis.
Keywords: Notched coating adhesion | Fracture toughness | Digital image correlation | Polyamide-imide | Virtual crack closure technique | Cohesive zone model
مقاله انگلیسی
10 Multiscale modelling of granular materials in boundary value problems accounting for mesoscale mechanisms
مدل‌سازی چند مقیاسی مواد دانه‌ای در مسائل ارزش مرزی برای مکانیزم‌های مقیاس متوسط-2021
The proper solution of geotechnical boundary value problems requires robust constitutive models that can describe the mechanical behavior of geomaterials under various loading conditions, while also accounting as closely as possible for the different material scales of interest. This is even more relevant to granular media where the complexity of the mechanical behaviour is not limited to the nature of the contact law between grains, and instead originates from the multiplicity of contacts oriented along all the directions of the physical space to form distinctive mesostructures. This paper revisits the so-called H-model, which belongs to the broad family of micromechanical approaches whereby an intermediate scale (mesoscale) is explicitly introduced into the formulation. One great advantage of the model is that it can be extended by accounting for further multi-physical couplings, as for example the presence of capillary bridges between grains. This versatile model was imple- mented within an explicit finite difference based computational software (FLAC), and the present work dem- onstrates its ability to analyze engineering problems with a microstructural viewpoint, while also providing new insights in microstructural mechanisms of failure difficult to capture with standard phenomenological models.
keywords: مواد گرانول | یکسان سازی | رویکرد چند منظوره | نظریه چندگانه | ریز ساختار | مقیاس Mesoscopic | مدل سازی سازنده | مدل H | مشکلات ارزش مرزی | Granular material | Homogenization | Multiscale approach | Multislip theory | Microstructure | Mesoscopic scale | Constitutive modeling | H-model | Boundary value problems
مقاله انگلیسی
rss مقالات ترجمه شده rss مقالات انگلیسی rss کتاب های انگلیسی rss مقالات آموزشی
logo-samandehi
بازدید امروز: 11788 :::::::: بازدید دیروز: 0 :::::::: بازدید کل: 11788 :::::::: افراد آنلاین: 68