Supersymmetric Extension of Non-Hermitian su(2) Hamiltonian and Supercoherent States

A new class of non-Hermitian Hamiltonians with real spectrum, which are written as a real linear combination of su(2) generators in the form $H=\omega J_{3}+\alpha J_{-}+\beta J_{+}$, $\alpha \neq \beta$, is analyzed. The metrics which allows the transition to the equivalent Hermitian Hamiltonian is established. A pseudo-Hermitian supersymmetic extension of such Hamiltonians is performed. They correspond to the pseudo-Hermitian supersymmetric systems of the boson-phermion oscillators. We extend the supercoherent states formalism to such supersymmetic systems via the pseudo-unitary supersymmetric displacement operator method. The constructed family of these supercoherent states consists of two dual subfamilies that form a bi-overcomplete and bi-normal system in the boson-phermion Fock space. The states of each subfamily are eigenvectors of the boson annihilation operator and of one of the two phermion lowering operators

Design of composite ducted horizontal axis tidal turbine

The marine current turbine is the mechanical device that captures the kinetic energy of marine current to generate electrical power. A panel method program coupled with the blade element momentum theory (BEM) was used to design a bare tidal turbine which reaches 88% of the Betz limit. The addition of a duct for a same overall cross section area has been investigated. The numerical results show that the ducted turbine’s power coefficient, which was computed using the overall cross section area, can be slightly increased if a camber duct profile with a flare angle is used. The hydrodynamic pressure obtained with the panel method code were then implemented as boundary conditions to a finite element analysis (FEA) in order to compute the mechanical behavior, stress distribution and deflection of the duct in composite material. The Hashin criterion was used for damage prediction

Economic diversification as a strategic developmental alternative within the framework of sustainable development

تهدف هذه الورقة البحثية إلى تشريح استراتيجية التنويع الاقتصادي كبديل تنموي مستدام في الدول العربية النفطية وتبيان الفوائد التي يفرزها التنويع الاقتصادي عند التطبيق، لتحقيق تقدم معتبر في بناء اقتصاد متنوع في مختلف القطاعات ومنها السياحة والعقارات والمصارف والطيران والطاقة النظيفة والاتصالات والاستثمارات الاجنبية...الخ لتصبح في الوقت الحالي هذه القطاعات مدرة لنسب معتبرة في الناتج الوطني.The objective of this paper is to analyze the economic diversification strategy as a sustainable development alternative in the Arab oil countries and to demonstrate the benefits of economic diversification in practice to achieve significant progress in building a diversified economy in various sectors including tourism, real estate, banking, aviation, clean energy, At present, these sectors are generating significant proportions in national output

Investigating the Barriers of Teacher-Learner Distance Communication: English Department of Mohammed 1st University as a Case Study

The spread of the Covid 19 Pandemic all over the world has obliged educational institutes to shift towards online education. Therefore, the ways and strategies of teacher-learner communication have changed also, and technology-based communication tools have become the alternative way of classroom communication. This paper attempts to shed light on the barriers of teacher-learner distance communication strategies in the Moroccan university context. The research draws on a quantitative analysis of a questionnaire of 10 multifaceted questions addressed to English Department Students of Mohammed 1st University. The survey sheds light on: a) the communicative strategies used by teachers and students during and after the course, b) the difference between face-to-face and distance communication, and c) teachers' feedback of questions and inquiries after the course. The results of the study reveal the shortcomings of distance education communication in the Moroccan University. Some of the main barriers are: 1) the lack of real-time interaction between students and their instructors, 2) the absence of collaborative and group activities, and 3) students often do not receive teachers’ feedback of their inquiries. The research ends by stating some strategies to facilitate teacher-learner distance communication

Towards Promoting Investment in Small and Medium-Sized Enterprises as a Strategic Choice for Sustainable Local Development

oai:ojs2.mer-j.com:article/5تهدف الورقة البحثية إلى إبراز دور المؤسسات الصغيرة والمتوسطة كاختيار استراتيجي في تحقيق تنمية مستدامة حيث يعقد عليها آمالا كبيرة وعريضة في هذا المجال. ففي ضوء ما تشهده الساحة الاقتصادية العالمية من تغيرات احتلت دورا رياديا في دعم الجهود التنموية. والجزائر كغيرها من الدول، انتهجت سياسة جديدة قوامها المؤسسات الصغيرة والمتوسطة باعتبارها النموذج الملائم لتحقيق تنمية محلية مستدامة إذ تعتبر حجر الزاوية في عملية التنمية، لذلك تعتبر عملية دعم وتطوير مثل هذه المؤسسات من أهم مرتكزات التنميّة المستدامة. تصنيف جال: F2، L10 .The paper aims to highlight the role of small and medium enterprises as a strategic choice in achieving sustainable development, with high and great expectations in this field. In view of the changes that have taken place in the global economic scene, they have taken a leading role in supporting development efforts. Like other countries, Algeria has adopted a new policy of small and medium-sized enterprises as the appropriate model for sustainable local development, which is the cornerstone of economic development. The process of supporting and developing such institutions is therefore one of the most important pillars of sustainable development

Thermal dehydrofluorination of GaPO-34 revealed by NMR crystallography

SEA thanks the Royal Society and the Wolfson Foundation for a merit award. The UK 850 MHz solid-state NMR Facility used in this research was funded by EPSRC and BBSRC (contract reference PR140003), as well as the University of Warwick including via part funding through Birmingham Science City Advanced Materials Projects 1 and 2 supported by Advantage West Midlands (AWM) and the European Regional Development Fund (ERDF). We acknowledge support from the Collaborative Computational Project on NMR Crystallography CCP-NC funded by EPSRC (EP/M022501/1).Using a combination of solid-state NMR spectroscopy, powder X-ray diffraction (pXRD), thermogravimetry, and periodic density functional theory (DFT) calculations, we investigate the calcination of the chabazite-type gallophosphate, GaPO-34, prepared with either 1-methylimidazole (mim) or pyridine (py) as the structure-directing agent (SDA) and fluoride as the charge-balancing anion. We demonstrate that, prior to SDA combustion, there is an unusual low-temperature dehydrofluorination step at ∼330 °C for the mim material, but not for the py form. The DFT-derived structure for the dehydrofluorinated intermediate contains pentacoordinate Ga species with Ga–N bonds of 2.04 Å to the mim nitrogen atom, in addition to four Ga–O bonds to neighboring PO4 tetrahedra. This observation is consistent with 71Ga NMR spectroscopy, which shows that one-third of the Ga is pentacoordinate with a large quadrupolar coupling constant of ∼11 MHz. Powder X-ray diffraction measured in situ on heating shows the transient appearance of a distinct crystalline phase between 325 and 425 °C before the characteristic chabazite structure is seen, which is consistent with dehydrofluorination prior to loss of the organic SDA. No such dehydrofluorinated intermediate structure is observed for the py form of GaPO-34, which is ascribed to the lower pKa of pyridinium relative to 1-methylimidazolium.PostprintPostprintPeer reviewe

High Prevalence of blaNDM Among Carbapenem Non‑Susceptible Klebsiella pneumoniae in a Tunisian Hospital First Report of blaNDM‑9, blaKPC‑20, and blaKPC‑26 Genes

peer reviewedFifty-four carbapenem non-susceptible Klebsiella pneumoniae (CNSKP) isolates were collected from a Tunisian hospital over a period of 13 consecutive months. Carbapenemase production and the prevalence of carbapenemase-encoding genes were investigated using combined-disk test (CDT), modified Carba NP (mCarba NP) test, and UV-spectrophotometry method complemented by PCR experiments and sequencing. Carbapenemase production was detected by the mCarba NP test and CDT in 92.59% and 96.29% of the 54 CNSKP isolates, respectively; while imipenem hydrolysis was detected using UV-spectrophotometry in the crude extracts of 44 isolates. blaNDM, blaOXA-48-like , and blaKPC carbapenemase-encoding genes were found in 48, 31, and 22 isolates, respectively. Remarkably, blaNDM-9, blaKPC-20 , and blaKPC-26 genes were reported. The co-occurrence of carbapenemase-encoding genes in a single isolate was detected in 62.96% of the isolates. The analysis of clonal relationships between the isolates by pulsed field gel electrophoresis revealed that the majority of them were geneti-cally unrelated. Our investigation provides molecular data on enzymatic mechanism of carbapenem non-susceptibility among 54 CNSKP showing the dominance of blaNDM, and comprises the first identification of blaNDM-9, blaKPC-20 , and blaKPC-26 genes in a Tunisia hospital

Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness

Fatigue cracking is an essential problem of asphalt concrete that contributes to pavement damage. Although stone matrix asphalt (SMA) has significantly provided resistance to rutting failure, its resistance to fatigue failure is yet to be fully addressed. The aim of this study is to evaluate the effect of crumb rubber modifier (CRM) on stiffness and fatigue properties of SMA mixtures at optimum binder content, using four different modification levels, namely, 6%, 8%, 10%, and 12% CRM by weight of the bitumen. The testing undertaken on the asphalt mix comprises the dynamic stiffness (indirect tensile test), dynamic creep (repeated load creep), and fatigue test (indirect tensile fatigue test) at temperature of 25°C. The indirect tensile fatigue test was conducted at three different stress levels (200, 300, and 400 kPa). Experimental results indicate that CRM-reinforced SMA mixtures exhibit significantly higher fatigue life compared to the mixtures without CRM. Further, higher correlation coefficient was obtained between the fatigue life and resilient modulus as compared to permanent strain; thus resilient modulus might be a more reliable indicator in evaluating the fatigue life of asphalt mixture