نتایج جستجو برای: caved material system
تعداد نتایج: 2532223 فیلتر نتایج به سال:
feminine voice and narratology in wuthering heights wuthering heights as a general "bronte" work has extraordinary dimensions to it which can make it focal to different ways of interpretation. among other differences the issue of narrative voice is essential in understanding the ultimate purpose of wuthering heights. emily bronte uses different narrators from various focal points speaking of m...
In this work, an inverse finite element formulation was modified for considering material anisotropy in obtaining blank shape and forming severity of deep drawn orthotropic parts. In this procedure, geometry of final part and thickness of initial blank sheet were known. After applying ideal forming formulations between material points of initial blank and final shape, an equation system was obt...
selective desulfurization of thiocarbonyls to carbonyls thioacetalization of aldehydes and ketones a useful reagent system for the dethioacetalization reactions
nowadays, the development of anti cancer drugs is an important subject in pharmacology. bisphosphonates (b.p) are a great choice for design and production of the types of drugs which not only could perform as anti cancer agents but also could inhibit the function of acetyl cholinesterase (ache). ache hydrolyzes the acetylcholine (which is a neurotransmitter in nervous system) using the oh in i...
Pressure relief for roadways retained by roof cutting is essentially caused stress transfer. In this paper, the transfer mechanism of 16011 tail entry with in Zhaogu No.1 coal mine studied from following two aspects: change surrounding rock structure and interaction between roadway supporting structures. It found numerical simulation that can significantly reduce magnitude stress, transferring ...
Underground longwall mining can seriously disturb the surrounding rock masses above panel. A surface cracking zone, continuous deformation fractured and caved zone be formed in overlying strata (termed “four zones”), which may further result spontaneous combustion of coal seams water inrush. It is essential to study predict development characteristics four zones induced by guarantee safety. The...
Background & Objectives : Local exhaust ventilation system (LEV) is one of the most common engineering controls methods for the chemical agents in workplaces. This study aimed to determine the efficiency assessment of the LEV system for control of Fe2O3 dust in the process of oxide screen unit at iron making in steel industry . Methods : The LEV system with an extensive network...
implicit and unobserved errors and vulnerabilities issues usually arise in cryptographic protocols and especially in authentication protocols. this may enable an attacker to make serious damages to the desired system, such as having the access to or changing secret documents, interfering in bank transactions, having access to users’ accounts, or may be having the control all over the syste...
In this note, small amplitude free vibration of a double-beam system in presence of inner layer nonlinearity is investigated. The nonlinearity is due to inner layer material and is not related to large amplitude vibration. At first, frequencies of a double-beam system with linear inner layer are studied and categorized as synchronous and asynchronous frequencies. It is revealed that the inner l...
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