نتایج جستجو برای: قطر d50
تعداد نتایج: 16272 فیلتر نتایج به سال:
از روشهای متداول ساماندهی و کنترل فرسایش کناری رودخانه استفاده از آبشکن است. آبشکن با هدایت جریان به سمت محور رودخانه، از ایجاد جریان قوی در طول ساحل جلوگیری کرده، مانع فرسایش ساحل رودخانه میشود. از سوی دیگر الگوی جدید جریان باعث فرسایش (آبشستگی) دردماغه آبشکن میشود. آبشکنها معمولاً به صورت چندتایی ساخته میشوند و پایداری آنها بستگی زیادی به پایداری اولین آبشکن دارد. در این مقاله پیش...
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Abstract Spacing between check dams depends on the stream bed slope, effective height of check dams and slope of deposited sediments behind the check dams. The slope of deposited sediments is more important than the other two factors because of complications in the way of its occurrence and its measurement after several years of dam construction. This research presents the effective factors a...
We consider a pure exchange economy repeated from a fixed endowment for an indefinite number of periods and posit a learning rule which directs convergence to competitive equilibrium. In each period trade converges to an allocation in the contract set, where agents interpret the current (common) normalized utility gradient as a vector of prices to determine the implied wealth redistribution rel...
-A simple method for estimating the remanent magnetization vector angle (e) is introduced. By using this method, the orientation effects of Ba-ferrite FDs on the effective vector angle for the remanent magnetization and on recording characteristics were investigated. The resul ts show that the angle e depends on perpendicular squareness ratio (S~) and is independent from Hc. Also, the larger th...
The paper surveys theories of the intertemporal allocation of funds through demand deposits and anonymous markets, ...rst separately and then in an integrated model. It reviews some work on the role of market frictions and asset characteristics, and suggests that the interplay between these two is crucial in explaining the observed coexistence of demand deposits and anonymous markets. JEL class...
This paper offers an alternative explanation for what is typically referred to as an asset pricing bubble. We develop a model that formalizes the Cochrane (2002) convenience yield theory of technology company stocks to explain why a rational agent would buy an “overpriced” security. Agents have a desire to trade but short-sale restrictions and other frictions limit their trading strategies and ...
This paper partially extends the f -core equivalence theorem of Hammond, Kaneko and Wooders (1989) for continuum economies with widespread externalities — i.e., those over which each individual has negligible control. Externalities need not result directly from trading activities. Neither free disposal of divisible goods nor monotone preferences are assumed. Instead, a slightly strengthened for...
This paper reviews some puzzling economic aspects of globalization and argues that they cannot be satisfactorily addressed in perfectly or monopolistically competitive models. Drawing on recent work, a model of oligopoly in general equilibrium is sketched. The model ensures theoretical consistency by assuming that firms are large in their own markets but small in the economy as a whole, and ens...
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