نتایج جستجو برای: هوش جمعی si
تعداد نتایج: 90819 فیلتر نتایج به سال:
A pot experiment was carried out to determine the effect of foliage spraying of silicon (Si) on growth and ornamental characteristics of calendula grown under salt stress and greenhouse conditions. A factorial experiment based on completely randomized design was conducted with 3 levels of Si (0, 50 and 100 mg/l) and 3 levels of NaCl (0, 100 and 200 mM) with 4 replications. At flowering stage, S...
Silicon (Si) is a beneficial nutrient for growth of crops such as cucumber. It seems that Si improves antioxidant capacity of plants and reduces damages induced by environmental stresses and metal toxicity. This research aimed to investigate the interaction of Si and cadmium (Cd) on growth, dry matter yield and catalase (CAT) activity, as an antioxidant enzyme, in cucumber. This hydroponic expe...
The compulsory-ordered ternary catalytic mechanism for two-substrate two-product enzymes is analyzed to account for binding of inhibitors to each of the four enzyme states and to maintain the relationship between the kinetic constants and the reaction equilibrium constant. The developed quasi-steady flux expression is applied to the analysis of data from citrate synthase to determine and parame...
Silicon (Si) has beneficial effects on the growth, yield, and tolerance of some crops against biotic and abiotic stresses. Considering the absence of Si in the nutrient solutions used in hydroponically-grown cucumber, the present study was conducted to investigate the influence of Si on the growth and yield of two cucumber genotypes (Cucumis sativus L. cvs. Dominus GRC and Super Dominus). In a ...
چکیده: کارایی بهتر شبکه عصبی به پارامترهایی همچون تعداد گره های ورودی، تعداد لایه های میانی، تعداد نرون ها، و وزن اختصاص یافته به نرون ها بستگی دارد. روش های متفاوتی جهت به روزرسانی پارامترها و ساختار شبکه عصبی مصنوعی ارائه گردیده است. یکی از روش های متداول و مورد استفاده در شبکه های عصبی، روش پس انتشار خطا (ebp) است که در آن تنها وزن های شبکه عصبی به روزرسانی می شوند. در این مقاله، ...
گزارش های در مورد اثر si روی رشد و حفاظت گیاهان در تنش های زنده و غیر زنده وجود دارد، اما رابطه بین اثر si و تجمیع فیتوکلاتین ، هیدرات کربن غیر ساختمانی، k و si کمتر مطالعه شده است. به این منظور اثر si روی مقدارهیدرات کربن غیر ساختمانی، فیتوکلاتین، si و k دردو رقم برنج شیرودی و اوس که مقاومت متفاوتی نسبت به شوری دارند مورد بررسی قرار گرفت. آزمایش در طرح فاکتوریل در محیط کشت شن با غلظت های 0، 0....
abstract silicon (si) is considered one of the beneficial elements for plant, however recent studies show that si plays an important role in plant resistance to environmental stresses , like salinity. an experiment was conducted to study the effect of si and nacl salinity on the growth, yield and fruit quality of strawberry (fragaria × ananassa duch) cv “selva” was grown hydroponically in the c...
Nanowires (NWs) are recently used in several sensor or actuator devices to improve their ordered characteristics. Silicon nanowire (Si NW) is one of the most attractive one-dimensional nanostructures semiconductors because of its unique electrical and optical properties. In this paper, silicon nanowire (Si NW), is synthesized and characterized for application in photovoltaic device. Si NWs are ...
Employing direct and alternative electric currents at the time of casting and solidification modified grains of Al and Si. The highest wear resistance was obtained in the direct current, and for alternative current the wear resistance corresponded to the electric current. The change of polarity in the pure Al did not influence the wear resistance, but for the Al-Si alloy the highest wear resist...
silicon (si) is considered as one of the beneficial elements for plants that play important roles in plant resistance to stresses. in this experiment, the effects of three levels of silicon (0, 0.85 and 1.7 mm) on the growth and physiological processes of pumpkin were studied in plants inoculated with sphaerotheca fuliginea (250000 conidia ml−1) and non-inoculated plants under hydroponic condit...
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