Unusual magnetic order in the pseudogap region of the superconductor HgBa₂CuO_4+δ

Li, Y.,Balé,dent, V.,Bariš,ić,, N.,Cho, Y.,Fauqué,, B.,Sidis, Y.,Yu, G.,Zhao, X.,Bourges, P.,Greven, M. Macmillan Publishers Limited. All rights reserved 2008 Nature Vol.455 No.7211

The pseudogap region of the phase diagram is an important unsolved puzzle in the field of high-transition-temperature (high-T<SUB>c</SUB>) superconductivity, characterized by anomalous physical properties. There are open questions about the number of distinct phases and the possible presence of a quantum-critical point underneath the superconducting dome. The picture has remained unclear because there has not been conclusive evidence for a new type of order. Neutron scattering measurements for YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>6+δ</SUB> (YBCO) resulted in contradictory claims of no and weak magnetic order, and the interpretation of muon spin relaxation measurements on YBCO and of circularly polarized photoemission experiments on Bi<SUB>2</SUB>Sr<SUB>2</SUB>CaCu<SUB>2</SUB>O<SUB>8+δ</SUB>(refs 12, 13) has been controversial. Here we use polarized neutron diffraction to demonstrate for the model superconductor HgBa<SUB>2</SUB>CuO<SUB>4+δ</SUB> (Hg1201) that the characteristic temperature T* marks the onset of an unusual magnetic order. Together with recent results for YBCO, this observation constitutes a demonstration of the universal existence of such a state. The findings appear to rule out theories that regard T* as a crossover temperature rather than a phase transition temperature. Instead, they are consistent with a variant of previously proposed charge-current-loop order that involves apical oxygen orbitals, and with the notion that many of the unusual properties arise from the presence of a quantum-critical point.

Experimental Measurement and Evaluation of the Noise Generated by Three Transmissions by Synchronous Belts of Type AT10, BAT10 and SFAT10

Sidi Mohammed Merghache,Amine Hamdi,Mohamed El Amine Ghernaout 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.1

Synchronous belt drives combine the advantages of simple belt drives (flat, trapezoidal or ridged) due to their low weight, low maintenance, large linear speed ranges and high transmission ratios with the advantages of chains: absence sliding, synchronized transmission of speed, low tensioning, etc. Thanks to the toothing of the belt which enters the corresponding one of the synchronous pulleys, there is direct transmission of the power without sliding as between two gears. This article develops an experimental study which makes it possible to see the influence of the angular speed, the engine torque and the setting tension on the impact noise of the belt teeth on the pulley teeth during meshing and vibrations of the free strands of the belt. We have measured the noise generated by three transmissions by synchronous belts of type AT10, BAT10 and SFAT10.

Advances in the design of macroporous polymer scaffolds for potential applications in dentistry

Sidi A. Bencherif,Thomas M. Braschler,Philippe Renaud 대한치주과학회 2013 Journal of Periodontal & Implant Science Vol.43 No.6

A paradigm shift is taking place in medicine and dentistry from using synthetic implants and tissue grafts to a tissue engineering approach that uses degradable porous three-dimensional (3D) material hydrogels integrated with cells and bioactive factors to regenerate tissues such as dental bone and other oral tissues. Hydrogels have been established as a biomaterial of choice for many years, as they offer diverse properties that make them ideal in regenerative medicine, including dental applications. Being highly biocompatible and similar to native extracellular matrix, hydrogels have emerged as ideal candidates in the design of 3D scaffolds for tissue regeneration and drug delivery applications. However, precise control over hydrogel properties, such as porosity, pore size, and pore interconnectivity, remains a challenge. Traditional techniques for creating conventional crosslinked polymers have demonstrated limited success in the formation of hydrogels with large pore size,thus limiting cellular infiltration, tissue ingrowth, vascularization, and matrix mineralization (in the case of bone) of tissueengineered constructs. Emerging technologies have demonstrated the ability to control microarchitectural features in hydrogels such as the creation of large pore size, porosity, and pore interconnectivity, thus allowing the creation of engineered hydrogel scaffolds with a structure and function closely mimicking native tissues. In this review, we explore the various technologies available for the preparation of macroporous scaffolds and their potential applications. A paradigm shift is taking place in medicine and dentistry from using synthetic implants and tissue grafts to a tissue engineering approach that uses degradable porous three-dimensional (3D) material hydrogels integrated with cells and bioactive factors to regenerate tissues such as dental bone and other oral tissues. Hydrogels have been established as a biomaterial of choice for many years, as they offer diverse properties that make them ideal in regenerative medicine, including dental applications. Being highly biocompatible and similar to native extracellular matrix, hydrogels have emerged as ideal candidates in the design of 3D scaffolds for tissue regeneration and drug delivery applications. However, precise control over hydrogel properties, such as porosity, pore size, and pore interconnectivity, remains a challenge. Traditional techniques for creating conventional crosslinked polymers have demonstrated limited success in the formation of hydrogels with large pore size,thus limiting cellular infiltration, tissue ingrowth, vascularization, and matrix mineralization (in the case of bone) of tissueengineered constructs. Emerging technologies have demonstrated the ability to control microarchitectural features in hydrogels such as the creation of large pore size, porosity, and pore interconnectivity, thus allowing the creation of engineered hydrogel scaffolds with a structure and function closely mimicking native tissues. In this review, we explore the various technologies available for the preparation of macroporous scaffolds and their potential applications.

Free vibration analysis of rotating cantilever plates using the p-version of the finite element method

Sidi Mohammed Hamza-Cherif 국제구조공학회 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.2

Electrical and Optical Study of PLED & OLEDS Structures

BOUANATI Sidi Mohammed,N. E. CHABANE SARI,MOSTEFA KARA Selma 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.3

Organic electronics are the domain in which the components and circuits are made of organic materials. This new electronics help to realize electronic and optoelectronic devices on flexible substrates. In recent years, organic materials have replaced conventional semiconductors in many electronic components such as, organic lightemitting diodes (OLEDs), organic field-effect transistors (OFETs) and organic photovoltaic (OPVs). It is well known that organic light emitting diodes (OLEDs) have many advantages in comparison with inorganic light-emitting diodes LEDs. These advantages include the low price of manufacturing, large area of electroluminescent display, uniform emission and lower the requirement for power. The aim of this paper is to model polymer LEDs and OLEDs made with small molecules for studying the electrical and optical characteristics. The purpose of this modeling process is, to obtain information about the running of OLEDs, as well as, the injection and charge transport mechanisms. The first simulation structure used in this paper is a mono layer device; typically consisting of the poly (2-methoxy-5(2’-ethyl) hexoxy-phenylenevinylene) (MEH-PPV) polymer sandwiched between an anode with a high work function, usually an indium tin oxide (ITO) substrate, and a cathode with a relatively low work function, such as Al. Electrons will then be injected from the cathode and recombine with electron holes injected from the anode, emitting light. In the second structure, we replaced MEH-PPV by tris (8-hydroxyquinolinato) aluminum (Alq3). This simulation uses, the Poole- Frenkel -like mobility model and the Langevin bimolecular recombination model as the transport and recombination mechanism. These models are enabled in ATLAS- SILVACO. To optimize OLED performance, we propose to change some parameters in this device, such as doping concentration, thickness and electrode materials.

Geometrical parameters optimizations of scarf and double scarf bounded joint

Fekih, Sidi Mohamed,Madani, Kuider,Benbarek, Smail,Belhouari, Mohamed Techno-Press 2018 Advances in aircraft and spacecraft science Vol.5 No.3

The aim of this work is to optimize the geometrical parameters as the adhesive thickness and the beveled angle to reduce the edge effect of the scarf and V bounded joint. A finite element analysis is done to define the generated stresses in the bounded joint. The geometrical optimum is obtained using the Experimental Design Method. Results show that the double scarf (V) joint is better than the simple scarf bounded joint.

Research on Value of Strengthening “School Football Skills Course” under the New Era of China

Yang, Sidi,Song, Jeho 한국스포츠학회 2019 한국스포츠학회지 Vol.17 No.2

전 세계적인 스포츠로서, 축구는 중국에 많은 참가 인구를 가지고 있다. 최근 몇 년 동안 중국은 축구 발전을 촉진 하기 위해 다양한 우대 정책과 대책을 도입했는데, "학교 축구 기술 코스"의 목표와 레벨에 있어 매우 중요하다. 코스의 모델은 체육관행 과정에서 지속적인 개선과 개혁을 통해 점진적으로 형성된다:스포츠 기술의 학습은 종합적인 신체적, 정신적 발전을 촉진하는 효과적인 접근법이며 "하나의 스포츠 위트"의 특징을 가지고 있다. 학교 스포츠의 '쓰리 인 원' 이라는 목표를 달성하기 위한 '스포츠 스킬 코스'의 구체적인 메커니즘은 청소년들의 운동을 통한 행복한 믿음의 확립, 운동 습관의 육성을 촉진하는 것, 스투의 신체 건강 수준을 향상시키기 위한 '개성 운동'의 시간 증가 등이다. 덴트 (dents);특수 스포츠 스킬의 수준을 향상시키기 위해 스포츠 스킬을 익히는 과정에서 "과다한 운동"과 "일반화 능력"의 개발 니즈에 대한 보증; 개인 성격과 공급 촉진을 위해 스포츠 스킬을 익힘으로써 얻은 성과를 통한 자기효능의 향상, 청소년의 건강하고 건전한 인격을 위한 육성을 달성한다. 그러나 현재 대부분의 학교들은 불분명한 이해와 모호한 개념, 그리고 약한 의식 때문에 체육에 대한 관심이 부족하며, 특히 축구 코스의 공식화된 훈련 목표, 교사의 부족, 그리고 운동 장의 열악한 여건 때문에 관심을 기울이지 못하고 있다. 본 논문은 위의 문제에 대한 견해와 의견을 주로 표현하고 있다. As a worldwide sport, football has a large participant population in China. In recent years, China has introduced various preferential policies and measures to promote the development, which is critical to the goal and level of the "school football technical course”. Therefore, it is of great importance for the goals and level of the "School Football Skills Course". The model of the course is gradually formed through continuous improvement and reform in the process of physical education practices. The learning of sports skills is an effective approach to promoting the comprehensive physical and mental development. The specific mechanism of the "Sports Skills Course" to achieve the goal of "Three in One" of school sports includes: the establishment of the happy belief by doing exercises of adolescents, the promotion of the cultivation of physical exercise habits and the increase of time of “initiative exercises” to improve the level of physical health of students; the guarantee for the development needs of "excessive exercises" and "generalization ability" in the process of learning sports skills to improve the levels of special sports skills; the improvement of self-efficacy through the achievements gained from learning sports skills to promote the development of individual personality and the supply, thereby achieving the cultivation for the healthy and sound personality of adolescents. At present, however, most schools pay insufficient attention to physical education due to unclear understanding, vague concept and weak consciousness, especially the formalized training objectives of football courses, the lacking of teachers and the poor conditions of sports venues. This paper mainly expresses the views and opinions on the above problems.

The Impact of Shortest Path Simulation via Interactive SVG Map in Tourism Industry

Jonathan Sidi,Liew Wei Fa 세계문화관광학회 2009 Conference Proceedings Vol.10 No.0

Nowadays, tourists that visit Kuching area especially area around Kuching Waterfront tend to loss their way easily because they are not familiar, especially for the first time visit. There are several existing map application in the real world such as Putrajaya Interactive Map, Map of Northern Michigan, Metrorail System Map, TriMet Interactive system Map and Collin Country Interactive Map. Most of these maps do not help tourist find shortest path. A solution is implementing an Interactive SVG Map that can find shortest path. Besides, when tourists notice that there is/are traffic path(s) along the shortest path, tourists able to set the traffic path(s) and find second shortest path which will avoid the traffic path(s). The map application had been implemented successful with the mean of 4.76 and standard deviation of 0.45 for usability testing.

Tunable Negative Differential Resistance in van der Waals Heterostructures at Room Temperature by Tailoring the Interface

Fan, Sidi,Vu, Quoc An,Lee, Sanghyub,Phan, Thanh Luan,Han, Gyeongtak,Kim, Young-Min,Yu, Woo Jong,Lee, Young Hee American Chemical Society 2019 ACS NANO Vol.13 No.7

<P>Vertically stacked two-dimensional van der Waals (vdW) heterostructures, used to obtain homogeneity and band steepness at interfaces, exhibit promising performance for band-to-band tunneling (BTBT) devices. Esaki tunnel diodes based on vdW heterostructures, however, yield poor current density and peak-to-valley ratio, inferior to those of three-dimensional materials. Here, we report the negative differential resistance (NDR) behavior in a WSe<SUB>2</SUB>/SnSe<SUB>2</SUB> heterostructure system at room temperature and demonstrate that heterointerface control is one of the keys to achieving high device performance by constructing WSe<SUB>2</SUB>/SnSe<SUB>2</SUB> heterostructures in inert gas environments. While devices fabricated in ambient conditions show poor device performance due to the observed oxidation layer at the interface, devices fabricated in inert gas exhibit extremely high peak current density up to 1460 mA/mm<SUP>2</SUP>, 3-4 orders of magnitude higher than reported vdW heterostructure-based tunnel diodes, with a peak-to-valley ratio of more than 4 at room temperature. Besides, Pd/WSe<SUB>2</SUB> contact in our device possesses a much higher Schottky barrier than previously reported Cr/WSe<SUB>2</SUB> contact in the WSe<SUB>2</SUB>/SnSe<SUB>2</SUB> device, which suppresses the thermionic emission current to less than the BTBT current level, enabling the observation of NDR at room temperature. Diode behavior can be further modulated by controlling the electrostatic doping and the tunneling barrier as well.</P> [FIG OMISSION]</BR>

Advances in the design of macroporous polymer scaffolds for potential applications in dentistry

Bencherif, Sidi A.,Braschler, Thomas M.,Renaud, Philippe Korean Academy of Periodontology 2013 Journal of Periodontal & Implant Science Vol.43 No.6

A paradigm shift is taking place in medicine and dentistry from using synthetic implants and tissue grafts to a tissue engineering approach that uses degradable porous three-dimensional (3D) material hydrogels integrated with cells and bioactive factors to regenerate tissues such as dental bone and other oral tissues. Hydrogels have been established as a biomaterial of choice for many years, as they offer diverse properties that make them ideal in regenerative medicine, including dental applications. Being highly biocompatible and similar to native extracellular matrix, hydrogels have emerged as ideal candidates in the design of 3D scaffolds for tissue regeneration and drug delivery applications. However, precise control over hydrogel properties, such as porosity, pore size, and pore interconnectivity, remains a challenge. Traditional techniques for creating conventional crosslinked polymers have demonstrated limited success in the formation of hydrogels with large pore size, thus limiting cellular infiltration, tissue ingrowth, vascularization, and matrix mineralization (in the case of bone) of tissue-engineered constructs. Emerging technologies have demonstrated the ability to control microarchitectural features in hydrogels such as the creation of large pore size, porosity, and pore interconnectivity, thus allowing the creation of engineered hydrogel scaffolds with a structure and function closely mimicking native tissues. In this review, we explore the various technologies available for the preparation of macroporous scaffolds and their potential applications.