This research uses the stability radius approach to investigate the robust stability of an infinite-dimensional linear discrete-time system subjected to stochastic perturbations. First, we characterize the stability radius in terms of a Lyapunov equation. These characterizations improve a computational formula for calculating the stability radius. The second goal is to study how state feedback can maximize the stability radius. We characterize the maximum attainable stability radius using an infinite-dimensional discrete-time Riccati equation. Examples are provided to demonstrate the achieved outcomes.
In this study, the validity of the estimation of a single regression equation for the diffuse frac- tion across 22 stations in India using the two parameters: the clearness index and the sunshine ratio is tested. The homogeneity test based on Fisher’s statistics was applied to test the homo- geneity of the estimated parameters across all stations. The results showed that the p-value at the level of 5% for each model is smaller than 0.05, indicating that all stations were heteroge- neous. The Hierarchical Cluster Analysis (HCA) was used to classify the data into homoge- nous clusters. The results of HCA indicated that the longitudinal data were divided into four main clusters. For each cluster, the regression analysis was applied based on the longitudinal data then, the fixed effects model (FEM) and the random-effects model (REM) were used for the evaluation. Further, the Hausman test was applied to choose between the fixed effects model and the random-effects model. Finally, the results showed that the four best regression models were found for the selected stations in the study area.
Neural networks are a set of algorithms whose operation is inspired by biological neurons, these networks have been developed to solve problems: control, recognition of shapes or words, decision, and memorization. In this work, we tried to make an implementation that combines the advantages of the compact point cloud representation but uses the traditional 2D ConvNet to learn the prior knowledge about the shapes. And by combining the 3 modules together, the convolution structure generator 2D and the merge and pseudo-rendering modules, we have obtained an end-to-end model that learns to generate a compact point cloud representation from a single 2D image, using only a convolution structure generator 2D. And at the end we got as final result: from a single RBG image → 3D point cloud
The fire-fighting system is one of the proactive technical barriers related to liquefied petroleum gas storage tank safety. This paper presents an integrated approach that uses fuzzy set theory, an improved-dependent uncertain ordered weighted averaging operator and fault tree analysis to handle uncertainty in the unavailability assessment of fire-fighting systems. In this study, the center of area is used to defuzzify triangular fuzzy numbers. Furthermore, for the fire-fighting system fault tree, importance analysis, including Fussell–Vesely importance measure and risk reduction worth of basic events, are performed to identify the weak links of the fire-fighting system. In addition, a real case study on a fire-fighting system for a liquefied petroleum gas storage system in an LPG unit in Algeria is provided to illustrate the effectiveness of the proposed methodology. The research results show that the proposed methodology makes it possible to assess the unavailability of the entire system by analyzing weak links. Consequently, some suggestions are given to take preventive–corrective actions in advance, in order to reduce the failure probability of fire-fighting system and assist the practitioners in setting priorities for improving safety procedures in liquefied petroleum gas storage tanks. The study provides references for analyzing safety barriers in a complex system.
هدفت الدراسة الآنية إلى البحث عن إمكانية وجود فروق في الذكاء الانفعالي عند التلاميذ الممارسين و غير الممارسين للأنشطة الرياضية الترويحية، و اعتمدت دراستنا على عينة قدرها 84 تلميذا متمدرسين بمتوسطة أحمد بوعكاز –صالح باي- سطيف. و بعد معالجة المتغيرات نظريا اعتمدنا على المنهج الوصفي ذو التصميم المقارن ، موظفين مقياس الذكاء الانفعالي لصاحبه أحمد علوان الذي تم تكييفه في البيئة الجزائرية و بعد إجراء المعالجة الإحصائية الوصفية و الاستدلالية المتمثلة في المتوسط الحسابي و الانحراف المعياري و اختبار T)) لمجموعتين مستقلتين. وقد توصلت دراستنا إلى مجموعة من النتائج تقر بعدم وجود فروق بين التلاميذ الممارسين و غير الممارسين في جميع أبعاد الذكاء الانفعالي سواء معرفة الانفعالات، تنظيم الانفعالات، التعاطف و التواصل الاجتماعي.
This paper seeks to explore the Algerian EFL learners’ beliefs about, and attitudes towards, promoting Learner Autonomy (LA) via the implementation of Collaborative Learning (CL) as a teaching method. The study was carried out at the Department of English of Mostefa Benboulaid Batna 2 University during the academic year 2018-2019. To meet the paper’s objectives, a quantitative approach was opted for where an adapted questionnaire was administered to the first-year students. The overall results revealed the positive disposition of the Algerian EFL learners towards the use of the CL teaching method as a channel to develop their autonomy.
According to several American and European scholars, intellectuals, and media experts in U.S. foreign policy, the American national security strategy had witnessed a reformulation in the 21st century after the 9/11 attacks. In reality, never after Pearl Harbor, America has experienced such a dramatic security event. For which the obvious question remains posed: President Bush’s National Security Strategy marked a new path to a universal American security measure? Did it develop a new policy process with new norms to fit the modern era? Accordingly, U.S. military intervention in Afghanistan aims to preserve; freedom, liberal values, deter terrorism, and protect the threatened American security; hence, we have come with this study to evidence that by the fact that Bush's unilateral preventive war strategy, which witnessed a blatant violation of International Law, Human Rights, and the United Nations Charter of State’s sovereignty, was no more than the natural reaction to their foreign policy adoption of duplicity. The American National Security Policy is, in reality, an overtly way of military expression policy to enforce duplicity.
In this paper, we consider the stationary problem in three dimensional thin domain ΩεΩε with maximal monotone graph and Tresca conditions. In the first step, we present the problem statement and give the variational formulation. We then study the asymptotic behavior when one dimension of the domain tends to zero. In the latter case a specific Reynolds limit equation is obtained and the uniqueness of the displacement of the limit problem are proved.
