Spectrum of one dimensional p-Laplacian operator with indefinite weight

This paper is concerned with the nonlinear boundary eigenvalue problem $$-(|u'|^{p-2}u')'=\lambda m|u|^{p-2}u\qquad u \in I=]a,b[,\quad u(a)=u(b)=0,$$ where $p>1$, $\lambda$ is a real parameter, $m$ is an indefinite weight, and $a$, $b$ are real numbers. We prove there exists a unique sequence of eigenvalues for this problem. Each eigenvalue is simple and verifies the strict monotonicity property with respect to the weight $m$ and the domain $I$, the k-th eigenfunction, corresponding to the $k$-th eigenvalue, has exactly $k-1$ zeros in $(a,b)$. At the end, we give a simple variational formulation of eigenvalues

Academic Exam Reminder Information System for Information Technology Master Student in UUM

The master students need to take final examinations almost every subject. The time, venue and date of the exams are decided by the Academic Affair Department in Higher Education Academy (HEA). Students need to get the information of the exams from the lecturers; this action troubled lecturers a lot. Then the students need to remember the information by themselves, wait to the date of exams and go there without any reminder. Once a student miss the exam, he is likely to fail the subject and need to retake it in next semester, all the effort he made in this semester will be useless, everything need to start from zero in the next semester. In order to avoid this case which will waste the lecturers' and students' time and effort, a prototype to remind the students take their own exams on time is very necessary, this prototype is hoped to solve the miss of the exams

Characteristics of sewage sludge biochar produced at a wide range of pyrolysis temperatures

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Durability of structural adhesives in bridges

Besides the 50s revolution of the use of adhesives in the new construction in the works of strengthening and repair of different structural elements, adhesives were extensively used in bridges for a long time. Different applications on bridges were carried out in the last few decades. The most common application of adhesives in bridge engineering was in the form of resin mortar for either bridge bearings or expansion joint nosings. Recently more applications of structural, semi-structural and non structural joints could be executed using adhesives in bridges. In reason of its ease of execution and maintenance as well as its long-term durability, resins represent highly challenging materials in last few decades for the means of formulating bridge connections. Although adhesives are recently used on wide ranges in joints in bridge engineering, their complicated behaviour, particularly under low temperatures, could disallow an easier use of such materials in structures, notably in bridges. As the following project targets to provide a better understanding of thermo-mechanical behaviour of resins, two different categories of testing were carried out, in order to investigate the most important and basic characteristics of resins as well as direct relations connecting different properties. The first series of tests was focusing on the physical characterization of resins aiming to investigate the influence of the degree of cure (conversion degree) on different characteristics as well as the behaviour of the material, From previous experiences on the behaviour of resins, it was expected that the more cured the material, the better properties it could present, however this investigation was held in LTC lab using a DSC machine. Different categories of tests were carried out during the physical characterization in order to establish a reliable relation between conversion degree/conversion rate and time. Another effective resin property that was considered during the physical characterization of resins is the glass transition temperature (Tg); Tg which represents the temperature at which the material loses part of its strength and/or stiffness, can also involve another concern which is the degradation of adhesives when exposed to high temperatures. The second series of testing involved in this project is mechanical testing, which was held in Lab of structures. This series was aiming to investigate the mechanical properties of the resin, basically compressive, tensile and shear strengths of these materials. Finally this project was focusing on relating the physical properties including mainly the degree of cure as well as the glass transition temperature to the mechanical properties and their influence on the mechanical behaviour of adhesives

Review - Challenges of mobility aware MAC protocols in WSN

© 2018 IEEE. In today\u27s smart world WSN plays an important role in IoT. The WSN nodes can be used for wildlife, patient, air quality monitoring. WSN consists of numerous sensor nodes that are connected to each other. One of the major concerns of WSN is the mobility of nodes. The mobility of the nodes creates concern to the MAC protocols that\u27s defined for WSN static nodes. Mobile-WSN demands the participated nodes to send packets with a bursty traffic, low energy consumption and reliable connection. MAC protocol is the most important in designing the WSN as MAC plays an important role regarding throughput, mobility, security and energy consumption. This paper gives a review on mobility aware protocols such as M-MAC, MA-MAC, MMH-MAC, M-Contiki, MobiIQ, MobiDisc

Implementació d’una estació meteorològica domèstica

El present projecte representa el desenvolupament d’una estació meteorològica a nivell domèstic basada en el microprocessador Arduino UNO juntament amb la integració de LabVIEW per a la visualització i anàlisis de dades ambientals en temps real. El principal objectiu es basa en el disseny d’un sistema accessible i econòmic que permeti monitorar paràmetres com la temperatura, la pressió atmosfèrica, la qualitat del aire o la humitat. La utilització de sensors i del microprocessador ajuden a la transmissió de dades mitjançant comunicació serial amb la interfície desenvolupada. Aquesta interfície gràfica destaca per les seves qualitats intuïtives mostrant dades en temps real via indicadors numèrics i gràfics, fet que afavoreix la comprensió de les tecnologies de mesura i control. Els resultats obtinguts mostren de manera clara que el sistema és capaç de monitorar amb una certa precisió i continuïtat els paràmetres de mesura estipulats, amb la possibilitat de generar arxius CSV per un posterior anàlisis de dades pels més curiosos. Finalment, aquest projecte afavoreix a la introducció en l’entorn Arduino, en el desenvolupament de sistemes electrònics mitjançant el software Fritzing i en el desenvolupament de SCADA, a banda d’oferir una solució econòmica i eficaç per a la monitorització ambiental desenvolupant una potencial aplicació per àmbits domèstics i educatiu

La cyclicité de la politique budgétaire des pays d’Afrique

African countries in general and those rich in commodities in particular have for the most part adopted pro-cyclical fiscal policies. In other words, they opt for a restrictive fiscal policy during a recession and an expansive policy in a period of expansion. This issue is nowadays a topical subject on which the economic literature tries to provide scientific answers that can allow public policies to eradicate this pro-cyclical bias. It is in this perspective that we undertake to conduct theoretical and empirical research on the determinants of fiscal cyclicality, its impact on economic activity and the relevance of the structural balance to the pro-cyclicality of public spending. To do this, we draw on the methodologies of Fatas and Mihov (2003, Fiess (2004, Frankel (2011, Frankel et al. (2013, Jeanneney and Tapsoba (2011, Végh (2013, and Bobbo (2016. For the empirical analyzes, we use instrumental variables and panel estimation techniques using firstly the fixed effects method of Driscoll and Kraay (1998, and secondly the two-stage ordinary least squares method (2 SLS and the generalized method of moments of Blundell and Bond (1998 in system to deal with problems of omitted variables and endogeneity. The results of our various investigations reveal that developing countries in Africa, and particularly those in the sub-Saharan region, tend to resort to pro-cyclical orientations of their public expenditures. This is explained by the fact that they hold significantly smaller budget structures than those of advanced countries. The empirical evidence suggests that membership in a fixed exchange rate amplifies this pro-cyclicality, unlike flexible exchange rate. They also prove that fiscal volatility induced by discretionary fiscal policy negatively influences economic growth. In addition, that only a counter-cyclical behaviour of discretionary fiscal policies can positively stimulate economic growth. The construction of a structural balance for six African countries whose methodology is based on the Chilean theoretical concept and whose aim is to protect against external shocks, to facilitate the conduct of a counter-cyclical fiscal policy and to work for a better budgetary planning, indicates that the deficit trend observed in some of these countries has been attenuated by taking into account the structural components of public finances. This analysis also proves that the measurement of the structural balance is problematic because its evolution, which is based on the calculation of the potential levels of real GDP and commodity prices, is still sensitive to the methodology used. Since opposing evolutions can be observed over certain periods thus leading to a certain asymmetry in the interpretation.Les pays d’Afrique en général et ceux riches en matières premières en particulier ont pour la plupart adopté des politiques budgétaires procycliques. Autrement dit, ils optent pour une politique budgétaire restrictive en période de récession et une politique expansive en période d’expansion. Cette problématique constitue de nos jours un sujet d’actualité sur lequel la littérature économique tente d’apporter des réponses scientifiques pouvant permettre aux politiques publiques d’éradiquer ce biais procyclique. C’est dans cette optique que nous entreprenons de mener une recherche théorique et empirique sur les déterminants de la cyclicité budgétaire, son impact sur l’activité économique ainsi que sur la pertinence du solde structurel vis-à-vis de la procyclicité des dépenses publiques. Pour ce faire, nous nous sommes inspirés des méthodologies de Fatas et Mihov (2003, de Fiess (2004, de Frankel (2011,de Frankel et al (2013, de Jeanneney et Tapsoba (2011, de Végh(2013, et de Bobbo (2016. Concernant les analyses empiriques, nous utilisons des variables instrumentales et des techniques d’estimation par panel en utilisant d’une part la méthode des effets fixes de Driscoll et Kraay (1998, et d’autre part les doubles moindres carrés ordinaires (2 SLS et la méthode des moments généralisés en système de Blundell et Bond (1998 pour traiter les problèmes de variables omises et d’endogénéité. Les résultats de nos différentes investigations révèlent que les pays en développement d’Afrique et particulièrement ceux de la zone subsaharienne ont tendance à recourir à des orientations procycliques de leurs dépenses publiques. Ce constat s’explique par le fait qu’ils détiennent des structures budgétaires sensiblement plus faibles que celles des pays avancés. Les preuves empiriques suggèrent que l’appartenance à un régime de change fixe amplifie cette procyclicité, contrairement aux régimes de change flexibles. Elles prouvent par ailleurs que la volatilité budgétaire induite par la politique budgétaire discrétionnaire détermine négativement la croissance économique. Et que seule une orientation contracyclique des politiques budgétaires discrétionnaires peut stimuler positivement la croissance économique. La construction d’un solde structurel pour six pays africains dont la méthodologie est issue du concept théorique chilien et dont le but est d’assurer une protection contre les chocs externes, de faciliter la conduite d’une politique budgétaire contracyclique et d’œuvrer pour une meilleure planification budgétaire nous indique que la tendance déficitaire observée au niveau de certains de ces pays a été atténuée par la prise en compte des composantes structurelles des finances publiques. Cette analyse apporte également la preuve que la mesure du solde structurel est sujette à caution, car son évolution qui est fondée sur le calcul des niveaux potentiels du PIB réel et des prix des matières premières reste tout de même sensible à la méthodologie utilisée. Puisque des évolutions opposées peuvent être observées sur certaines périodes entrainant ainsi une certaine asymétrie au niveau de l’interprétation

The Impact of Export Volatility on Economic Growth in Algeria during 1992-2016: An Econometric Study

الأهداف: تُعدّ مشكلة تذبذب الصادرات في اقتصادات البلدان الأقل نمواً موضوعا مُهمّاً في الأدبيات الاقتصادية ، وتهدف هذه الورقة إلى دراسة التأثير المحتمل لتذبذب الصادرات على النمو الاقتصادي في الجزائر. المنهجية: تستخدم الدراسة نموذج الاقتصاد القياسي لتقدير تأثير تذبذب الصادرات على النمو الاقتصادي في الجزائر للفترة 1992-2016، إضافة إلى ذلك، تمّ استخدام نموذج انحدار آخر لتحليل آثار التذبذبات في أسعار الصادرات وكمياتها على النمو الاقتصادي في الجزائر. النتائج: أظهرت النتائج أنه لا توجد علاقة ذات دلالة إحصائية بين مؤشر عدم استقرار الصادرات والناتج المحلي الإجمالي الحقيقي، وهذا يعني أنّ تذبذب الصادرات لا يُشكّل عقبة أمام الأداء الاقتصادي في الجزائر. الخلاصة: كشفت الدراسة أنّ التذبذبات في الأسعار وكميات الصادرات لا تؤثر على الناتج المحلي الإجمالي الحقيقي في الجزائر. أوصت الدراسة بأهمية توجه صانعي السياسات إلى تقليل اعتماد قطاع التصدير على المنتجات النفطية وتحسين الأداء الصناعي في الجزائر، إضافة إلى أهمية العمل على تنفيذ خطط تثبيت الأسعار وتخصيص المزيد من الأموال الاحتياطية للنفط للحدّ من الآثار الضارة المحتملة لتذبذب الصادرات على الأداء الاقتصادي للجزائر في المستقبل.Objectives: The issue of export volatility in the economies of less developed countries (LDCs) is a significant topic of debate in economic literature. This paper aims to investigate the potential effect of export volatility on economic performance in Algeria. Methods: The study utilizes an econometric model to estimate the impact of export volatility on economic growth in Algeria for the period 1992-2016. Additionally, another regression model is used to analyze the effects of fluctuations in export prices and quantities on economic growth in Algeria. Results: The findings show that there is no significant relationship between the export instability index and real GDP. Conclusion: The study concludes that fluctuations in the prices and quantities of exports do not influence Algeria’s real GDP. Policymakers should reduce the dependency of the export sector on oil products and improve industrial performance in Algeria. Implementing price stabilization schemes and allocating more oil precautionary funds are also needed to mitigate any possible damaging effects of export volatility on Algeria’s economy in the future

Psychometric Verification of the Endemic Disease Phobia Scale Among a Sample of University Students in the Jordan Society

The study aimed to psychometrically validate a scale for measuring endemic disease phobia among a sample of students from Al al-Bayt University in Jordan. The study sample consisted of randomly selected 251 male and female students from Al al-Bayt University in the Hashemite Kingdom of Jordan. The scale used was the Endemic Disease phobia scale developed by Arpaci et al. (2020). Its validity was assessed through confirmatory factor analysis on the four factors, and the scale demonstrated good validity and reliability, indicating its potential use in clinical screening of students. The study found significant differences in the impact of demographic variables on Omicron phobia, with serum type and frequency of obtaining it being factors that influenced Omicron phobia. The study recommends developing specialized programs that focus on guidance, prevention, and treatment for individuals who are experiencing long-term effects of COVID-19 pandemic phobia. The study also recommends using the current scale, likely referring to a measurement tool or assessment instrument used in the study, for both research and diagnostic purposes