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تعداد نتایج: 111 فیلتر نتایج به سال:
This paper was concerned with the effect of Mg on the temperature mechanical behavior and evaluation of the microstructure. The results showed that with increasing Mg from 0 to 47 ppm, the grain size was reduced from 64 to 38 µm and the carbides volume fraction was raised from 2.2 to 4.6 vot%. Mg changed the morphology of the carbide from a coarse and continuous one to a separate one. Mg ...
Bos taurus and indicus cattle subspecies present different capabilities in coping with situations of elevated temperatures, the latter being more tolerant to heat stress. Thus, some breeding programs crossed these produce a high producing yet heat-tolerant breed (Girolando). Nineteen Holstein (H100) 19 Girolando cows [(½ à Gir (H50) ¾ (H75)] similar milk production were used six-day experime...
چکیده ما ابتدا بر اساس سه ترکیب 10 naco3-36baco3-4tio2-50b2o3 و 46baco3-4tio2-50b2o3 و 44baco3-6tio2-50b2o3 ابتدا به روش ذوب کوره ای شیشه ساختیم سپس نمودارdta این نمونه ها را برای دستیابی به دمای گذار ودمای کریستالی شدنشان گرفتیم. انگاه از ترکیب دوم دربالای دمای گذار 7 نمونه در سه دمای باز پختی 570?c, 610?c ,625?c را بررسی کردیم بدین صورت که این 7نمونه را ابتدا در دماهای گفته شده ودر زمانهای گ...
In this study, The Al 6061 alloy sheets were produced by Cryorolling process and then were welded by resistance spot welding method. In this regard, the solution treated Al 6061 alloy cryorolled subsequently up to 90% reduction in thickness to produce nanostructure alloy. The cryorolled sheets were then subjected to aging treatment (130˚C-30h) in order to obtain simultaneous strength and ductil...
production of fe-c alloy powders by mechanical alloying was studied. fe and graphite elemental powdermixtures containing 0.8 and 1.5wt.% graphite were mechanically alloyed using a planetary ball mill. thestructural changes of powder particles during mechanical alloying were studied by x-ray diffractometery,scanning electron microscopy and microhardness measurements. for both compositions, mecha...
In this study, The Al 6061 alloy sheets were produced by Cryorolling process and then were welded by resistance spot welding method. In this regard, the solution treated Al 6061 alloy cryorolled subsequently up to 90% reduction in thickness to produce nanostructure alloy. The cryorolled sheets were then subjected to aging treatment (130˚C-30h) in order to obtain simultaneous strength and ductil...
The Tolman-Bondi solution of the Einstein equations is used in order to model the time evolution of the void observed in Boötes. The present density contrast of the central region (∼ −0. 75) and its radius (∼ 30h −1 M pc) are fixed , while the density parameter of the Universe , the amplitude of the density contrast inside the void wall , the width of this wall and the distance from the void ce...
The efficacies of several dosage schedules, productive of plasma levels of cefotiam and cefazolin of short and long duration and starting at three levels of cefotiam and cefazolin of short and long duration and starting at three different times (3, 18, and 30h) after infection, were examined in experimental pneumonia caused by Klebsiella pneumoniae DT-S in mice. With each of the multiday regime...
The Tolman-Bondi solution of the Einstein equations is used in order to model the time evolution of the void observed in Boötes. The present density contrast of the central region (∼ −0. 75) and its radius (∼ 30h −1 M pc) are fixed , while the density parameter of the Universe , the amplitude of the density contrast inside the void wall , the width of this wall and the distance from the void ce...
ABSTRACT Novel summary statistics beyond the standard 2-point correlation function (2PCF) are necessary to capture full astrophysical and cosmological information from small-scale (r < 30h?1Mpc) galaxy clustering. However, analysis of beyond-2PCF on small scales is challenging because we lack appropriate treatment observational systematics for arbitrary field. In this paper, develop a fo...
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