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Register a new userأهمية البورون وطريقة تقديره في التربة والنبات بجهاز السبكتروفوتومتر
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الهيئة العامة للبحوث الزراعية كتاب
Publication date
2020
fields
Agrarian Economy
and research's language is
العربية
Created by
Shamra Editor
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بحث صادر عن الهيئة العامة للبحوث العلمية والزراعية في مركز بحوث حمص عن أهمية البورون وطريقة تقديره في التربة والنبات بجهاز السبكتروفوتومتر
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This research aims to inspect the defects and discontinuities in steel billet by
ultrasonic detector. Straight beam probe used to detect a lot number of imported steel
billets that clearly have internal defects.
The results showed the possibility
of initial detection by straight beam probe, and
initial defining the types of defects such as, micro and macro cracks, shrinkage defect,
blow holing, inclusion, porosity and others type of internal defects.
The experiments showed that if the necessity is defining the size of defects, this
requires angle beam probe in addition to straight beam probe.
تحت الظروف الطبيعية للتربة والمناخ في محافظة دير الزور نفذت تجربة حقلية وتجربة اصص . حج الأصص ( 1260cm3 ) في الموسم الزراعي 2012-2013 في قرية المريعية.
نفذ البحث في مركز الابحاث التابع لجامعة الفرات بمحافظة دير الزور للموسم الزراعي 2011- 2012 على نبات القرنبيط البلدي
The study aims at comparing ARIMA models and the exponential
smoothing method in forecasting. This study also highlights the special
and basic concepts of ARIMA model and the exponential smoothing
method.
The comparison focuses on the ability
of both methods to forecast
the time series with a narrow range of one point to another and the time
series with a long range of one point to another, and also on the different
lengths of the forecasting periods. Currency exchange rates of Shekel to
American dollar were used to make this comparison in the period
between 25/1/2010 to 22/10/2016. In addition, weekly gold prices were
considered in the period between 10/1/2010 to 23/10/2016. RMSE
standard was used in order to compare between both methods. In this
study, the researcher came up with the conclusion that ARIMA models
give a better forecasting for the time series with a long range of one point
to another and for long term forecasting, but cannot produce a better
forecasting for time series with a narrow range of one point to another as
in currency exchange prices.
On the contrary, exponential smoothing method can give better
forecasting for Exchange Rates that has a narrow range of one point to
another for its time series, while it cannot give better forecasting for long
term forecasting periods
The hydrodynamic activation of NaOCL plays an important role in increasing
its disinfectant efficacy.
The aim of this study was to evaluate the efficacy of a 5.25% sodium hypochlorite Activated by
EndoActivator device in reducing the bacterial load in the infected root canal.
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