نتایج جستجو برای: ماده 725
تعداد نتایج: 36253 فیلتر نتایج به سال:
اثر کمبود روی بر رشد، مقدار رنگیزه ها و فتوسنتز گیاه کلم قرمز (brassica oleracea l. var. capitata f. rubra) در سه شرایط نوری متفاوت، شامل 100، 200 و 400 µmolm-2s-1 در محیط هیدروپونیک با غلظت کافی (725 پیکومول روی آزاد) و پایین (30 پیکومول روی آزاد) مطالعه شد. تولید ماده خشک اندام هوایی و ریشه در شرایط کمبود روی به ترتیب تا 95 % و 63 % کاهش، ولی تحت تأثیر افزایش شدت روشنایی افزایش یافت. کمبود رو...
OBJECTIVE HIV testing is mandatory in re-education-through-labour camps (laojiaosuo) in China yet no studies have reported on the process. METHODS The survey response rate was 100% although 29 detainees were excluded because they were under 18 years of age. A cross-sectional face-to-face survey was conducted in three labour camps in Guangxi, located in the south-western region of China. RES...
Solid-core silica photonic crystal fiber is proposed borrowing the concept of golden ratio (1.618) and keeping it between pitch and air hole diameter Λ d in a subset of six rings of air-holes with hexagonal arrangement. In the case when we have a pitch equal to one micron (Λ = 1 μm), we need air-holes diameters d = 0.618 μm in order to achieve two zero dispersion wavelength (ZDW) points at 725 ...
In this study, we investigated phase separation and long-range atomic ordering phenomena in InGaN alloys produced by molecular beam epitaxy. Films grown at substrate temperatures of 700–750 °C with indium concentration higher than 35% showed phase separation, in good agreement with thermodynamic predictions for spinodal decomposition. Films grown at lower substrate temperatures ~650–675 °C! rev...
This paper examines the career concerns of security analysts using long histories of their earnings forecasts, job separations and stock coverage assignments. Our findings include the following. Relatively good (accurate) past forecast performance increases the probability that an analyst moves from a low status to a high status (large, prestigious) brokerage house, while relatively poor past f...
OBJECTIVE This study aims to develop a noninvasive prenatal test on the basis of the analysis of cell-free DNA in maternal blood to detect fetal aneuploidy at chromosomes 13, 18, 21, X, and Y. METHODS A total of 166 samples from pregnant women, including 11 trisomy 21, three trisomy 18, two trisomy 13, two 45,X, and two 47,XXY samples, were analyzed using an informatics-based method. Cell-fre...
The Case for Thoroughly Testing Complex System Dynamics Models Wayne Wakeland and Megan Hoarfrost 1 Systems Science Ph.D. Program, Portland State University 2 Stanford University 1 P.O. Box 751, Portland, OR 97207 (503) 725-4975(v) (503) 725-8489 (f) [email protected] Abstract In order to determine whether model testing is as useful as suggested by modeling experts, the full battery of model tes...
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