توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Physical modelling study of free and submerged flow on the obstructions in rivers with ten modes of Transverse waves
اطلاعات انتشار: هشتمین سمینار بین المللی مهندسی رودخانه، سال
تعداد صفحات: ۸
In many conditions in rivers the vertical cylinders are in the bed of the river that flow passes through them. These vertical cylinders like piers of bridge or vegetation on the floodplain of rivers. In the paper attention is focused on the transverse waves generated in a river or an open channel where the flow passes through a cluster of rigid vertical cylinders. In this study a rectangular flume with 72cm in width and 6m in length and 60cm in height was used. The rigid and vertical cylinders with variation sizes were attached to the bed of the flume with different densities and configuration arrangements. A comprehensive set (760 in total) of experiments were conducted in the flume. The waves were produced from the periodic forces created by the vortex shedding from the cylinders. In some of the experiments (119 Exp.) the flow on the obstructions was submerged but still the waves were produced as this phenomenon for the first time is reported in this paper and the oscillations was obviously seen in the flume. The discharge of flow was varied from 2.2 l\s to 25 l\s. The height of the outlet control weir was changed from the highest to the lowest levels, with ten modes of oscillation occurring across the laboratory flume for each sequence. The results provided an explanation for different wave formations that might occur due to vortex shedding when the flowing fluid is water was experimentally investigated and free and submerged flow was on the obstructions. Finally a new formulation was obtained from dimensional analysis, to estimate the amplitude of the transverse wave generated by vortex shedding in rivers or open channels in free or submerged flow.<\div>

۲Numerical Modeling of Reinforced Concrete Structures with Concrete Damage Plasticity
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
In most cases concrete structures are modeled considering simplified behavior of elastic material. Such a behavior, however, does not have capability to yield adequate answers right after crack initiation. In this paper the most accurate model for reinforced concrete structures so–called concrete damage plasticity is addressed. This model includes post cracking behavior of reinforced concrete structures in compression and tension as well as elastic and plastic stiffness degradation effects. Since concrete damage plasticity encompasses all behaviors of concrete, it requires plethora of laboratory test data. Parameters for which the model demands are also introduced along with required laboratory tests the parameters need to be determined. Having known that concrete structures possessing damage behavior cannot be modeled by conventional solving procedures, explicit method is also proposed to illustrate this type of material behavior. Finally yet importantly, one example of above–mentioned application showing the accuracy of the problem is successfully given<\div>

۳Awareness, Knowledge and Attitude of Dental Students of Tehran and ShahidBeheshti Universities of Medical Sciences about Evidence–based Dentistry
اطلاعات انتشار: دندانپزشكي - جامعه اسلامي داندانپزشكان، سال
تعداد صفحات: ۷

۴NUMERICAL MODELING STUDY OF VORTEX SHEDDING IN TWO DIFFERENCE POSITION OF SQUARE OBSTACLE PLACEMENT AT Re = 100
اطلاعات انتشار: سومین کنفرانس بین المللی رویکردهای نوین در علوم، مهندسی و تکنولوژی، سال
تعداد صفحات: ۱۵
The target of present study is simulation patterns of vortices and investigate square obstacle placement angle at these patterns.This simulation is done by selection<\div>

۵NUMERICAL MODELING STUDY OF VORTEX SHEDDING IN TWO DIFFERENCE POSITION OF SQUARE OBSTACLE PLACEMENT AT Re = 100
اطلاعات انتشار: چهارمین کنفرانس بین المللی پژوهش های نوین در علوم مهندسی و تکنولوژی، سال
تعداد صفحات: ۱۵
The target of present study is simulation patterns of vortices and investigate square obstacle placement angle at these patterns.This simulation is done by selection<\div>

۶Application of Geostatistical Modelling to Study the Exploration Adequacy of Uniaxial Compressive Strength of Intact Rock alongthe Behesht–Abad Tunnel Route
اطلاعات انتشار: International Journal of Mining & Geo-Engineering، چهل و هشتم،شماره۲، ۲۰۱۴، سال
تعداد صفحات: ۱۱
Uniaxial compressive strength (UCS) is one of the most significant factors on the stability of underground excavation projects. Most of the time, this factor can be obtained by exploratory boreholes evaluation. Due to the large distance between exploratory boreholes in the majority of geotechnical projects, the application of geostatistical methods has increased as an estimator of rock mass properties. The present paper ties the estimation of UCS values of intact rock to the distance between boreholes of the Behesht–Abad tunnel in central Iran, using SGEMS geostatistical program. Variography showed that UCS estimation of intact rock using geostatistical methods is reasonable. The model establishment and validation was done after assessment that the model was trustworthy. Cross validation proved the high accuracy (98%) and reliability of the model to estimate uniaxial compressive strength. The UCS values were then estimated along the tunnel axis. Moreover, using geostatistical estimation led to better identification of the pros and cons of geotechnical explorations in each location of tunnel route.
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