Handbook of materials selection, John Wiley & Sons

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1486 صفحه pdf

Handbook of materials selection

John Wiley & Sons

2002

Heat Exchangers-Selection, Design and Construction

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612 صفحه pdf

Heat Exchangers-Selection, Design and Construction

Longman Scientific & Technical

Editor

David Browning

SELECTION AND APPLICATION OF VALVES Mohinder L. Nayyar, P.E. ASME Fellow

اختصاصی از اس فایل SELECTION AND APPLICATION OF VALVES Mohinder L. Nayyar, P.E. ASME Fellow دانلود با لینک مستقیم و پر سرعت .

Valves are an essential part of any piping system that conveys liquids, gases, vapors,
slurries and mixtures of liquid, and gaseous phases of various flow media. Starting
with primitive means for stopping, allowing, or diverting water-flow from a source
through shallow or deep channels, such as wooden or stone wedges stuck between
the edges of a water passage, man has developed several different types of simple
and sophisticated valve designs. Different types of valves include: gate, globe, check,
ball, plug, butterfly, diaphragm, pinch, pressure relief, and control valves. Each of
these types has several categories and designs, each offering different features and
functional capabilities. Some valves are self-actuated while others are manually
operated or have actuators that are powered with electric motors, are pneumatic
or hydraulic, or a combination to operate the valve. Valves are manufactured with
metals and nonmetals. Valves are used in industrial piping systems, transportation
and distribution pipelines, building services piping, civic facilities, and irrigation
piping systems. The piping systems of industrial, commercial, residential, and other
civic facilities carry the lifeblood of modern civilization, like arteries and veins.
And the valves in those piping systems serve the functions of allowing, stopping,
regulating, and controlling the flow, to fulfill the intended objectives of the system.
When fluid pressure builds up beyond a set limit, the valves relieve the overpressure
to safeguard the integrity of the piping system or a component. Valves help in
maintaining or breaking a vacuum. Valves also assist in maintaining the pressure
or temperature of the flow medium within the desired range or limit. In order to
select a suitable valve for a particular application, the user must evaluate the
valve characteristics, including the design features, materials of construction, and
performance, in light of specific application requirements: flow medium, process
design requirements, piping design criteria, and economic factors. This chapter
provides a brief discussion of topics considered in the selection and application of
commonly used valves.

انتخاب سامانه رنگ بر اساس استاندارد و تجربه صنعت: Paint System Selection

اختصاصی از اس فایل انتخاب سامانه رنگ بر اساس استاندارد و تجربه صنعت: Paint System Selection دانلود با لینک مستقیم و پر سرعت .

دو فایل بسیار کاربردی برای انتخاب سامانه رنگ بر اساس جنس، کاربرد و شرایط کاربرد تجهیزات بر اساس استاندارد IPS و تجربه صنعتی بسیار موثق که در مجموع سه صفحه می باشند.

کاربرد خانگی، نیمه صنعتی و صنعتی مخصوص افراد دخیل در انتخاب رنگ (فروشنده، نقاش، بازرس رنگ)

نمونه: سطح خارجی مخزن کربن استیل (فولاد معمولی) بدون عایق با دمای کاری 0~90 درجه سانتیگراد: درجه آماده سازی Sa2.1/2-لایه اول Zinc Rich Epoxy-لایه نهایی MIO2 Pack Epoxy

Recovering from Selection Bias in Causal and Statistical Inference مقاله هوش مصنوعی 2014

اختصاصی از اس فایل Recovering from Selection Bias in Causal and Statistical Inference مقاله هوش مصنوعی 2014 دانلود با لینک مستقیم و پر سرعت .

Abstract

Selection bias is caused by preferential exclusion of units from the samples and represents a major obstacle to valid causal and statistical inferences; it cannot be removed by randomized experiments and can rarely be detected in either experimental or observational studies. In this paper, we
provide complete graphical and algorithmic conditions for
recovering conditional probabilities from selection biased
data. We also provide graphical conditions for recoverability
when unbiased data is available over a subset of the variables.
Finally, we provide a graphical condition that generalizes
the backdoor criterion and serves to recover causal effects
when the data is collected under preferential selection.