Design & Modeling of a Single Machine Flow Rack As/rs

In this paper, we aim to introduce a new variation of the flow rack automated storage and retrieval system (AS/RS) using a single machine for storage and retrieval operations instead of two machines. Also, analytical expressions are derived for expected single and dual cycle times of the storage and retrieval machine. For that, randomized storage assignment, and Tchebychev travel are assumed. Two dwell point positions are investigated and compared to determine the best one. Finally an experimental validation using simulation is conducted to verify the quality of the developed

Evaluation of the attitudes of phytotherapists towards the herbal treatment of obesity in the light of ancient and modern theoretical knowledge - field study in Tlemcen (Algeria)

This research aimed to reveal the phytotherapists attitudes towards medicinal plants therapy used to treat obesity through identifying the nature of these attitudes and their degree of compatibility with what is in the ancient scientific manuscripts and the research publications in the modern chemistry. To do this, a choice was made of an intentional sample of 34 Herbalists-Phytotherapists (from several regions of the province of Tlemcen). Then the researchers used a face-to-face interview to survey the attitudes using a 27-item Likert-scale test. To determine the nature of the sample\u27s attitudes and also the level of their knowledge, a descriptive analytical approach was adopted, while giving 1 for true attitudes and 0 for false or neutral ones. To estimate the respondents\u27 level of general knowledge, the ratio of correct attitudes in the scale was calculated and then classified into three levels: good, medium and low. The results of the study revealed certain popularity in the nature of the sample’s attitudes toward the treatment by plants. They also revealed the emergence of the pragmatic utility principle in several test items, and a partial compatibility of the sample’s knowledge compared with that in ancient texts and scientific research in modern chemistry. These results were able to show, moreover, the effect of the level of study, the years of therapeutic experience and the origin of the experience in the respondents\u27 attitudes

L"Archtecture islamique une hermeneutique spirituelle LEXMPLE DE TLEMCEN

Jugée exclusivement décorative l'architecture islamique fus pendant longtemps dépreciee par les historiens de l'Art Ce  n'est que vers la fin du dix –nevieme siecle (et particulierement au début siecledernie) que,grâce aux differents couran

The Apparent Thermal Conductivity of Pozzolana Concrete

AbstractThe recent development of some lightweight construction materials, such as light concrete, can play an important role as an insulator, while maintaining sufficient levels of mechanical performance. The quality of insulation to provide depends on the climate, the exposure of the walls and also the materials used in the construction. The choice of a material to be used as an insulator, obviously, depends on its availability and its cost.This is a study of natural pozzolanas as basic components in building materials. It is intended to highlight their thermal advantage. It is economically advantageous to use pozzolana in substitution for a portion of the clinker as hydraulically active additions, as well as in compositions of lightweight concretes in the form of pozzolanic aggregate mixtures, which provide mechanical strengths that comply with current standards.A theoretical study is conducted on the apparent thermal conductivity of building materials, namely concrete containing pozzolana. Thermal modeling, apparent to that commonly used for porous materials, has been applied to pozzolana concrete.Experimental results on measurements of the apparent thermal conductivity of pozzolana concrete are reported in this study, using an approach that considers that concrete is composed of two solid ingredients, a binding matrix (hydrated cement paste) and all aggregates. A second comparative theoretical approach is used for the case where concrete consists of a solid phase and a fluid phase (air)

Assessing the Wind Power Potential in Naama, Algeria to Complement Solar Energy through Integrated Modeling of the Wind Resource and Turbine Wind Performance

In the context of the escalating global climate crisis and the urgent need for sustainable energy solutions, this study explores the integration of wind energy as a supplementary source to solar photovoltaic energy in Naama, Algeria. The research utilizes a decade-long anemometric dataset, along with concurrent solar radiation data, to investigate the potential of harnessing wind energy, particularly during periods of low solar irradiance. Employing advanced statistical methods, including the Weibull distribution, the study assesses the wind power generation potential of a 2 kW/day turbine. The research highlights an average evening increase in wind speeds, which inversely correlates with the diminished solar energy production after sunset. This seasonal pattern is further substantiated by a significant negative correlation between wind speed and solar radiation for most of the year (January to May and September to December), with Pearson coefficients ranging from −0.713 to −0.524 (p < 0.05). However, the study also notes an absence of a notable correlation during the summer months (June to August) attributed to seasonal wind variations and the peak of solar irradiance. These findings confirm Naama as an ideal location for integrated renewable energy systems, thereby demonstrating the natural synergy between solar and wind energy. This synergy is particularly effective in mitigating the intermittency of solar power, thus highlighting the potential of wind energy during periods of low solar activity