Algerian Journal of Research and Technology (AJRT)

Evaluation of Sn-117m Production in the SM-3 High-Flux Reactor

2024-06-25T13:19:06+00:00

Due to its electron emission, the ^117mSn isotope is an important radionuclide for therapeutic applications, showing promise in the palliative treatment of painful metastases in bone cancers. Also, ^117mSn emits a specific 158.6 keV gamma ray which allows imaging for targeting and also for dosimetric purposes. The SM-3 reactor is a 100 MWth high flux reactor able to produce a wide range of radioisotopes for various applications in nuclear medicine and industry. In this work, we investigated the modeling of ^117mSn production in the SM-3 high flux reactor. Calculations are performed using the ChainSolver 2.34 code. The calculations showed that the specific activity of 117mSn was about 10 Ci.g-1 during 5 full power irradiation days.

Realization of an Inexpensive Embedded Pyranometer for measuring the amount of direct incident solar radiation in the visible and near-infrared

2024-06-26T07:08:25+00:00

This paper presents a detailed description of a mini pyranometer (8-bit 2 input). This device is dedicated to gnirusaem direct incident solar radiation, In the visible and near-infrared (using two broad-spectrum photodiodes, BPW21 and BPW34, respectively). This device is often coupled with an automatic recorder (a datalogger) to establish a record of measurements over a long period, to proceed to a good dimensioning of a system of photovoltaic panels on a region in the process of electrification in solar energy. This assembly's realization was centered on using the
smallest 8-bit microcontroller existing on the current market, a PIC10F222 of 6 pins only, from the baseline range of the Microchip. This microcontroller is responsible for ensuring all functions available in this device (measurements, controls, and L.U.T schedule management for each sensor concerned), using specialized integrated modules
such as a 2-channel 8-bit analog-to-digital converter. Its low consumption (170 amps under 2V, 4MHz) makes it particularly recommended for designing and producing devices with high energy independence.

Clay Stability in Liquids: Effect of Aluminum Oxide and Zinc Oxide Nanoparticles

2024-06-29T09:04:24+00:00

In the petroleum industry, clay is a major composition of water and oil based drilling fluids, but other additives are introduced to enhance rheological properties. One of such additives includes aluminum oxide (Al₂O₃) and zinc oxide (ZnO) nanoparticles which have been reported to improve drilling fluid characteristics. However, the effect of these nanoparticles on the stability of clays in different liquid mediums needs to be investigated.
In this work, the effect of Al₂O₃ and ZnO nanoparticles on the stability of clays in distilled water, brine of 30g/l salinity, ethanol and diesel is studied in quiescent column of liquids in the absence and presence of crude oil. Results show that Al₂O₃ and ZnO nanoparticles enhance clay instability in liquids; in fact, clays are more stable in liquids in the absence of these two kinds of nanoparticles than in their presence. In order not to enhance clay instability in liquids, it is suggested that Al₂O₃ and ZnO nanoparticles be used cautiously and possibly with other kinds of nanoparticles that promote particle stability in fluids. Further studies in determining the effect of organic matters on clay stability is encouraged since observations are inconsistent especially in the references cases where nanoparticles are absent.

Study and practical implementation of a CHUA circuit synchronized between Master-Slave

2024-06-29T09:22:30+00:00

The Chua circuit is a simple classical electronic circuit exhibiting chaotic behaviour and considered as a true paradigm of chaos in the real world. In this paper, we propose an innovative practical implementation of two Chua circuits in master-slave configuration using the OrCAD environment.
An original procedure allowing the mutual synchronisation of these two circuits is developed and experimentally validated. The detailed study of the synchronised behaviour reveals interesting cryptographic properties, in particular a high sensitivity to initial conditions. A final demonstrator consisting of the two synchronised circuits is then produced, characterised and exploited to extract relevant information for innovative chaos-based cryptographic applications.
This work opens up promising prospects for the practical use of the Chua circuit, a recognised simple chaotic system, in the development of advanced cryptographic approaches exploiting the unique properties of synchronised chaotic systems.

Novel Inorganic-Organic Heterojunction Solar Cell based Pt/CuSbS2/Abs/ZnO/FTO Perovskite Using Two MAPI and FAPI Absorbent Materials

2024-07-02T04:40:43+00:00

In this paper, three perovskite solar cell (PSCs) configurations were proposed and compared in order to improve their performance. The first suggested cell consists of six materials arranged in the sequence FTO/ETL/FAPI/MAPI/HTL/Pt, comprising
two active sub-layers, FAPI and MAPI. The performance of this double-active-layer cell was compared to that of two single-layer cells, each containing an only active layer of perovskite material used in proposed cell, with FTO/ETL/MAPI/HTL/Pt and
FTO/ETL/FAPI/HTL/Pt configurations. The simulations were conducted using SCAPS-1D software. The study investigated the impact of active layer thickness, doping density, and defect density on J-V characteristics for each cell, comparing the results obtained at the same time. Additionally, the defects density in interfaces: MAPI/HTL, FAPI/MAPI and ETL/FAPI of the double-absorber cell were optimized.
The best results were achieved by the double-layer cell with thickness of 1500 nm, defect density of 1010 cm-3 and doping density of 1020 cm-3 for FAPI and MAPI materials. The optimized cell exhibited Voc = 1.41 V, Jsc = 27.88 mA/cm2, FF = 90.12%, and PCE = 35.46 %.

Experimental Modal Analysis for Aerial Centerline Fuel Tanks

2024-07-02T05:07:25+00:00

External aerial fuel tanks are attached to the aircraft to extend their range and endurance. This experimental study presents a meticulous investigation into the dynamic characteristics of aerial fuel tanks A and B, employing resonance search tests and frequency sweep tests. The experimental setup, involving cyclic excitation and
vibration analysis, aimed to predict and compare the tanks' natural frequencies, mode shapes, and structural damping. The acquired data revealed striking similarities in dynamic behavior, affirming that both tanks exhibit consistent responses to external forces. The structural damping values, mode shapes, and resonant frequencies closely aligned, indicating negligible variations in geometry, material, and production technology. The increase in natural frequencies with mode number reflects enhanced structural stiffness and responsiveness. The comprehensive analysis supports the conclusion that tank B is well-prepared for flight testing, showcasing its stability and reliability in dynamic conditions as tank A passed already the flight test.