Study of the Optimal Parameters for the Formation of Selenium Complex with the (NEDA) N- (1-naphthyl-ethylenediamine dihydrochloride) C_12 H_14 N_(2. 2) 〖HCl〗_ Reagent and its use for the Control of Selenium Microcapsules

Selenium is an essential nutritional mineral, and selenium deficiency diseases are known in medical literature. Studies have shown that selenium intake in high doses is toxic in humans. Selenium is widely distributed in nature and due to the importance of selenium and its compounds in industrial applications; several analytical techniques have been reported to estimate selenium. In this study the optimal conditions for the formation of selenium complex with NEDA reagent will be studied and used for the control of selenium microcapsules, a method that is characterized by being rapid, sensitive and selective. The optical spectrophotometric method was used in the visible field at 540 nm wavelength to determine the complex between the selenium ion and the NEDA reagent under optimal conditions for complex formation namely temperature 50℃, time min t = 240, added reagent volume V=4ml, and reagent concentration 1%. This method showed good accuracy and correctness, as the method's validity was achieved through the relative percentage yield (R = 99.68%), while the accuracy of the method was achieved through the low value of the standard deviation (SD≤) (1.172) and thus the percentage relative standard deviation (RSD≤) (1.725). Selenium microcapsules were prepared, with an entrapment efficiency of 36% at a concentration of 3% for alginate and 1% while the entrapment efficiency rose to 51.2% at a concentration of 2% for calcium chloride.

Design of integrated current sensor BICS for IDDQ Test in CMOS circuits

IDDQ testing techniques are used to detect the physical defects such gate oxide shorts,floating gates and bridging faults, and which happen for the presence of manufacturing faults during the manufacturing processes of CMOS integrated circuits, which cannot be detected by classical logical testing.

Study the Performance of Image Descriptor for Building Panoramic Image

In this paper an evaluation of image keypoints detectors and descriptors is presented when used for building panoramic image. The descriptors: (SIFT, SURF, BRIEF, ORB, BRISK, and FREAK) were discussed, when used with the appropriate keypoints detectors on database taken indoors by RGB-D camera. Crosscheck and RANSAC (RANdom Sample Consensus) algorithms were used to find transform matrix between images. The speed of keypoints detectors and descriptors, the matching speed, the average of extracted keypoints, recall and precision were investigated. Oxford dataset was used to find the best descriptor for dealing with rotation and illumination changes that might occur due to changes in illumination angle. The obtained results showed that SIFT was the keypoint descriptor with the highest performance in non-real time applications. The SURF/BRISK was the best detector/descriptor which can be used in real time applications with comparable SIFT's results.

Hierarchical Failure detectors implementation using dual mode of heartbeat and interaction

In this paper, we propose an implementation of hierarchical failure detectors, which depends on dividing the processes into sub-groups and elect one leader called the main process . The main process then distributes the remaining processes into groups and chooses one leader for each one. Finally failure detector applied in the chosen leaders which send the results to the central process.

Determination Total polyphenol Conten in different Black Teas commercially in Syria

Black tea which contains polyphenol is important for health benefits and it is considered as antioxidant contents . The extraction parameters, time and temperature and kind of solvent extraction, can Influence the polyphenol concentrations of Black tea, and were investigated in this study. The purpose of the study was to quantify the polyphenols (catechin, epicatechin, epigallocatechin, epicatechin gallate, epigallocatechin gallate) in different kinds of teas ( Lipton , Alrabee , Layalina ) which are available in Syria market.The study was conducted using two types of solvents methanol 70% the adoption of the reference method adopted ISO14502-1 and water 100% , at different extraction times (1, 3, 5, and 10 minutes) and extraction temperatures (60°C , 70 °C , 80°C, 90°C, 100°C). the total polyphenols content was determined using the phenol reagent (Folin Ciocalteu reagent) adoption gallic acid as standard compound the overall content values of polyphenols have been monitoring in extracts methanol 70% and water 100% .

Failure detector implementation using dual mode of heartbeat and interaction

Failure detection plays a central role in the engineering of distributed systems. Furthermore, many applications have timing constraints and require failure detectors that provide quality of service (QoS) with some quantitative timeliness guarantees. Therefore, they need failure detectors that are fast and accurate. Failure detectors are oracles that provide information about process crashes , they are an important abstraction for fault tolerance in distributed systems. Although current failure detectors theory provides great generality and expressiveness, it also possess significant challenges in developing a robust hierarchy of failure detectors. In this paper, we propose an implementation of failure detectors. this implementation uses a dual model of heartbeat and interaction. First, the heartbeat model is adopted to shorten the detection time. if the detecting process does not receive the heartbeat message in the expected time, the interaction model is then used to check the process further.

Determination of the neutrino mass through the study of the energy spectrum of radiation of Strontium-90 isotope

In this work, using a scintillation detector with Strontium-90 source as a try to measure the electronic neutrino mass from a simple technique and different from what is used in this area where current techniques used are very complex and require substantial amounts. Also, detector calibration (to find the straight calibration equation), in addition to identified the maximum energy of β- particles (electrons), experimentally, by selection the channel number and then finding the energy value from the calibration equation (as a straight line). We have studied the disintegration changed energy with absorbent material which is an aluminum slices that have different thickness. We have observed the decrease in the values of the maximum energy of the electrons with increases the thickness of the slices. The energy changes with thickness as: E = f (x), (a straight line have a negative inclination). Applying Fermi 's theory and Kurie's plot allowed to find the maximum energy of disintegration electrons (1697,58 keV), this value is so close to experimental value (1653,45 keV), with dubity (2,6%) We have found that the electronic mass neutrino mass is almost to be non-existent, or we can said that the Strontium-90 disintegration does not allow to measure mass neutrino mass accurately, this is due to the high value of the disintegration energy of the Strontium- 90 isotope.

Analytical and experimental study of the effect of noise background on the radioactivity measurement

In this experimental work, the instruments used (detector, calibrating sources) has been calibrating, the calibration line of the detector deduced and it has been finding that the equation of calibration line takes the form: The resolution power R has been studying as function of the distance between the activity source and detector; the results obtained show that R decrease by increase the energy of the lines spectrum, this mean that the detector resolution power become bigger. It has been measured the LC، LD and MDA using two different methods of background radiation value, trapezium method and classical method, for two different distances between radioactivity source and detector: (9,3cm) and (10cm). The results show: 1- There is similar comportment of the LC، LD and MDA in function energy and the distance between radioactivity source and detector. 2- The trapezium method gives better results from the classical method to the radiation background, and this leads to lesser MDA value, this means that the sensibility is bigger to measure this quantity. 3- The relative error using MDA is (5%) for large values, and (10%) for small values

Analytical and experimental study of the mechanisms of computing and measuring the radioactivity of the radioactive sources

In this work, we have used the basic techniques for measuring gamma rays. It is based on the use of a sodium iodide (NaI) detector withthallium activated (Tl). We have obtained:  The detector calibration NaI(Tl) and the resolution of the spectrometer.  Measuring and determining the activity of a source can be doneby using the relative, and the absolute method. The results obtained show bythe Comparison between the experimental and the theoretical(of the sources activities)a good agreement, and the best values obtained by the absolute method.

Analytical and experimental study of the Rutherford scattering cross section

In this work, it has been recording the alpha particles emitted from an Amerecium-241 source, and scattered by a gold and Aluminum thin foils as a function of the scattering angle q (0o-30o), using a semiconductor detector and Rutherford scattering chamber. It always has been measuring the differential cross section resulting from this scattering, and experimentally determining the atomic number of Gold and Aluminum. Comparison between experimental and theoretical results shows a good agreement.