A typical dynamometer drive shaft was damaged during its working condition. This failure was repeated in four cases. In the present article, a failure analysis of a dynamometer drive shaft has been performed. To analyze the failure, the material investigation was carried out by scanning electron microscopy (SEM) images. Additionally, the micro-structure of the failed coupling shaft was photogra...

Understanding the grain size-dependent failure behavior of polycrystalline graphene is important for its applications both structurally and functionally. Here we perform molecular dynamics simulations to study the failure behavior of polycrystalline graphene by varying both grain size and distribution. We show that polycrystalline graphene fails in a brittle mode and grain boundary junctions se...

When learning from reasoning failures, knowledge of how a system behaves is a powerful lever for deciding what went wrong with the system and in deciding what the system needs to learn. A number of benefits arise when systems possess knowledge of their own operation and of their own knowledge. Abstract knowledge about cognition can be used to select diagnosis and repair strategies from among al...

Cardiovascular diseases claim more lives worldwide than any other. Etiologically, the dominant trajectory involves atherosclerosis, a chronic inflammatory process of lipid-rich lesion growth in the vascular wall that can cause life-threatening myocardial infarction (MI). Those who survive MI can develop congestive heart failure, a chronic condition of inadequate pump activity that is frequently...

We show that the honeycomb out-of-plane model derived by Gibson and Ashby can be applied to describe the compressive behavior of unidirectional porous materials. Ice-templating allowed us to process samples with accurate control over pore volume, size, and morphology. These samples allowed us to evaluate the effect of this microstructural variations on the compressive strength in a porosity ran...

We present a preliminary exploration of application crash events in Win32 systems by automatic clustering. The crash events, collected from workstations in the UC Berkeley electrical engineering and computer science department, identify the crashed application and DLL, and the time of the crash event. We use these identifying features to augment the crash data with information about usage patte...

Historically, the study of the wear of hard dental tissues in modern man has been limited to clinical observation of physiologic and pathologic conditions that lead to wear, and to attempts to duplicate the effects of hygienic procedures such as the use of toothbrush and dentifrice on hard dental tissues in the laboratory. However, several fundamental investigations have been reported in which ...

While traumatic aortic rupture (TAR) continues to be a major cause of fatality in motor vehicle accidents, the underlying mechanisms of it are not well understood. A major step to gain an insight into this problem is to understand the mechanical behavior of aortic tissue under loading conditions that lead to the failure. Although the mechanical properties of blood vessels under physiological pr...

The heart failure (HF) syndrome can be defined as the final pathway of any type of heart disease. The sympatho-inhibitory cardiovascular reflexes, such as the arterial baroreceptor reflex, are significantly decreased in HF. Patients with HF present higher ventilation for a certain workload when compared with normal individuals. This fact generates low ventilatory efficiency and is related to hi...

heart failure (hf) is a condition due to a problem with the structure or function of the heart impairs its ability to supply sufficient blood flow to meet the body's needs. in developing countries, around 2% of adults suffer from heart failure, but in people over the age of 65, this rate increases to 6-10%. in iran, around 3.3% of adults suffer from heart failure. the health belief model (hbm) ...