نتایج جستجو برای: 8 m2s to 554010
تعداد نتایج: 10759956 فیلتر نتایج به سال:
This study reports the oxidation behavior of a Ni-based alloy used in manufacture valve seats for automotive engine exhaust systems. Isothermal thermogravimetric analyses were carried out at temperatures 660, 740, 860, and 900 °C under an oxygen atmosphere up to 1 h. At 660 740 °C, only one stage was observed during whole time studied. this stage, oxide layer formed mainly by NiO + Cr2O3, follo...
this study investigated the potential role of age in inductive and deductive grammar learning among iranian foreign language learners. the experimental population consisted of our randomly selected samples including two groups of children (with age of exposure to english within 8-13), and two groups of adults (with age of exposure to english within 11-13). thus, the comparison was between ch...
tourism , today as one of the ways to make money, create jobs , and social and political interactions is considered. this paper aims to examine the strengths and weaknesses of tourism development in mahmoud abad ( mazandaran ). the research method in this study is " descriptive - analytical " and to collection of data used field methods such as questionnaires and documentation - library. the sa...
this research was conducted to examine the effect of a concurrent training on rest level of leptin of plasma and some hormonal factors in non-athlete subjects. the research population included non-athlete men who didn’t participate in any organized sport activities. 30 men were chosen voluntarily among the above-mentioned population and were divided into 2 groups: experimental (15 subjects) an...
Long-term VHF radar (53 MHz with 3 beamwidth) observations at Gadanki (13.5 N, 79.2 E), India, during the period from September 1995 to August 1999 are used to study monthly, seasonal and annual medians of vertical eddy diffusivity, K in the troposphere, lower stratosphere and mesosphere. First, the spectral width contribution due to non-turbulent effects has been removed for further analysis a...
we have devided the thesis in to five chapters. the first recollects facts from purely algebraic theory of jordan algebras and also basic properties of jb and jb* - algebras which are needed in the sequel. in the second chapter we extend to jb* - algebras, a classical result due to cleveland [8]. this result shows shows the weakness of jb* - norm topology on a jb* - algebera. in chapter three, ...
Flow boiling in microchannels is one of the most desirable cooling solutions for high power electronics. However, it challenging to promote flow performance, particularly critical heat flux (CHF), due their unfavorable liquid rewetting. Inlet restrictors (IRs) have been successfully used manage two-phase instabilities microchannels. IRs would result extremely pressure drop. In this study, witho...
Soil respiration is a significant contributor to the global emissions of CO2 and governed by many soil factors. Reliable estimates emission on different scales (e.g., field, regional level) are hard obtain due expressed spatial temporal variability flux. This study aims investigate flux properties in soybean cropland Fluvisols (Croatia). The field measurements samples were taken regular samplin...
This paper presents an experimental characterization of liquid nitrogen (LN2) flow boiling in additively manufactured minichannels. There is a pressing need concerted efforts from the space exploration and thermal transport communities to design high-performance rocket engine cooling channels. A close observation literature gaps warrants systematic cryogenic asymmetrically heated small (<3 m...
The issue of high concentration salt in soil is not restricted to coastal areas, but also expands cultivated lands, complicating, or even intercepting, the growth plants. objective this paper study effect zeolite, compost and effective microorganisms (EM), seaweed extract, ceramic powder on MM106 apple (Malus domestica Borkh.) plants normal saline conditions. More specifically, weight dry matte...
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