262,551 research outputs found
Histoire générale des sciences, publiée sous la direction de René Taton, t. I : La science antique et médiévale (Des origines à 1450), 2e éd. révisée et mise à jour
No full textRached Roshdi. Histoire générale des sciences, publiée sous la direction de René Taton, t. I : La science antique et médiévale (Des origines à 1450), 2e éd. révisée et mise à jour. In: Revue d'histoire des sciences et de leurs applications, tome 21, n°2, 1968. pp. 173-178
Histoire générale des sciences, publiée sous la direction de René Taton, t. I : La science antique et médiévale (Des origines à 1450), 2e éd. révisée et mise à jour
No full textRached Roshdi. Histoire générale des sciences, publiée sous la direction de René Taton, t. I : La science antique et médiévale (Des origines à 1450), 2e éd. révisée et mise à jour. In: Revue d'histoire des sciences et de leurs applications, tome 21, n°2, 1968. pp. 173-178
Etude Ab-initio de nouveaux Matériaux Ultra-durs à base des mono-nitrures et mono-carbures de métaux de transition 5d
No full text<p><i><strong>Abstract</strong></i></p><p>We theoretically study the structural stability, elastic and electronic properties of the transition metal mono nitride and mono carbide compounds (TMN's and TMC's) by using the full-potential linear muffin-tin orbital (FP-LMTO) method, in the framework of the density functional theory (DFT) within the local density approximation (LDA) for the exchange correlation functionals. The equilibrium ground state of properties including lattice parameters, bulk modulus and its pressure derivatives for the six considered crystal structures, Rock-salt (B1),CsCl (B2), zinc-blend (B3) , Wûrtzite (B4), NiAs (B81) and the tungsten carbides (Bh) were calculated. The elastic constants of TMN's and TMC's in its different stable phases are determined by using the total energy variation with strain technique. The elastic moduli for polycrystalline materials, such as the shear modulus (G), Young's modulus (E), and Poisson's ratio (ν) were estimated. The Debye temperature (θD) and Sound velocities (vm) were also derived from the obtained elastic moduli. In the objective to propose a new Superhard materials in TMN's and TMC's, the analysis of the hardness classified IrN (B3), OsN (B4 and B81), ReN (B81), WN (B81) and OsC (B81) as Superhard materials. Our results for the band structure and the density of states (DOS), show that TMN's and TMC's in its more stable phase have the metallic characteristic with strong covalent nature Metal-Non Metal elements. It is our ambition that these calculations will inspire further experimental research on these compounds.</p>
Crisis in trust through the contemporary Lebanese novel
No full textNaoum Abi-Rached wonders what foundations are necessary for being able to establish a dialogue and establish trust, bearing in mind that the references and the experiences one has lived through are distinct. What supports do language and ways of speaking need inorder to overcome suspicion, establish trust and culminate in a dialogue that will not be a dialogue of the deaf? For Abi-Rached, trust does not have its own existence, and it is conceived only in the process of a relationship with others. This author prefers to define the I in interaction with the Other and not through the Other. But, who is this Other? Friend or foe? Through writing, an attempt is made at re-establishing the lost balance of a society threatened at its foundations. The violence that we find in these writings issometimes a cry of pain or an interrupted dialogue, but the novels are constructed to refind the lost trust or to illustrate a trust which is being lost
A preliminary investigation on hydrogel disks imbibed with enriched transfersomes as promising tool to promote the cutaneous deposition of vaccine antigens
No full text[EN] The skin is an appealing and easily accessible route of administration for fast mass vaccination. However, it relies mainly on injection, meaning no immunization is achieved locally. In addition, pain, fear, and injuries strongly affect and reduce the effectiveness and adherence of patients to vaccination plans. Non-invasive routes of administration offer a safe and reliable solution. On these bases, three series of phospholipid vesicles were ecofriendly developed and adequately modified to pursue cutaneous immunization. Ovalbumin was selected as the model antigen, whereas transfersomes were chosen over liposomes because of their higher capability to cross the skin. Glycerol, sodium hyaluronate, or their combination were added to further improve their penetration, and this led to small ( 0.05 with respect to the ovalbumin solution tested at the same dose), they are expected to perform better than the ovalbumin solution due to the protection and the enhanced skin deposition they provide. In addition, all the formulations can be safely administered as they are highly biocompatible in a wide range of doses (>100 % from 0.05 to 50 mu g/mL of ovalbumin) and do not exert any inflammatory response. However, further studies are needed to confirm these promising preliminary results.Aroffu, M.; Rached, RA.; Castangia, I.; Italiani, P.; D'apice, L.; Fernandez-Busquets, X.; Nácher Alonso, MA.... (2024). A preliminary investigation on hydrogel disks imbibed with enriched transfersomes as promising tool to promote the cutaneous deposition of vaccine antigens. Journal of Drug Delivery Science and Technology. 102. https://doi.org/10.1016/j.jddst.2024.106399S10
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Modeling and Control of Nonlinear Systems Using Wavelet Networks
No full textA Master of Science Thesis in Mechatronics Submitted by Wissam Hassouneh Entitled, "Modeling and Control of Nonlinear Systems Using Wavelet Networks," December 2006. Thesis Advisor is Dr. Rached Dhaouadi. Available are both Soft and Hard Copies of the Thesis.The main objective of this research is to present wavelet networks as a new scheme to model and control nonlinear dynamic systems. The ability to control a system depends on how well it is modeled. Most real-world systems are inherently nonlinear, and conventional PID controllers, having fixed proportional, integral and derivative terms, are not able to deal with time-varying nonlinearities. Such conditions require adaptive controllers that can modify the P, I and D terms to compensate for these nonlinearities. Furthermore, the capability of wavelet networks in the modeling of dynamic nonlinear systems makes them appealing for use in system modeling and control. This research develops an adaptive PID- Dynamic Wavelet Network controller, comprising a digital PID controller and a proposed new wavelet network scheme called the Dynamic Wavelet Network (DWN), in order to model and control nonlinear systems. The learning strategy for the wavelet network and PID controller is developed based on the gradient descent algorithm. The performance of the proposed controller is demonstrated via extensive numerical simulations.College of EngineeringMultidisciplinary ProgramsMaster of Science in Mechatronics Engineering (MSMTR
Robust Control of Elastic Drive Systems Using The Immersion and Invariance Methodology
No full textA Master of Science thesis in Mechatronics Engineering by Irfan Ullah Khan entitled, "Robust Control of Elastic Drive Systems Using The Immersion and Invariance Methodology," submitted in October 2013. Thesis advisor is Dr. Rached Dhaouadi. Available are both soft and hard copies of the thesis.This thesis is divided into three main parts. The first part presents a new robust control methodology to suppress the torsional vibrations in flexible drive systems. The position control of a nonlinear Two-Mass-Model system (2MM) is designed using the immersion and invariance approach. First, appropriate mapping functions are derived to convert the total nonlinear 2MM system into an equivalent reduced order system with rigid dynamics. This reduced order system is used as a target system to design a position controller, which is based on the standard PI type control technique. Next through immersion and invariance, the reduced order controller is applied to the nonlinear 2MM system to suppress the torsional vibrations and yield an over-damped response similar to the target system. The control law derivation and stability analysis of the target system are described and discussed. Simulation and experiments using a 2MM drive system are used to validate the proposed control methodology. The second part of the thesis presents the design of a nonlinear reduced order observer to estimate the load side position and load side speed of an elastic drive system. A reduced order observer is designed using the notion of invariant manifold. First, a manifold is defined in terms of the error dynamics, and then mapping functions are chosen in such a way that the error dynamics become asymptotically stable at the origin. Asymptotic stability of the error dynamics at the origin is proved. Simulation and experimental results are shown to validate the proposed methodology. Then the observer is combined with an I&I position controller and the results are validated through simulations and real time experiments. In the third part of this thesis, the input/output feedback linearization technique is explained and implemented on the same system. External and internal dynamics are derived for the 2MM. Feedback linearization gains are designed for external linear dynamics. The stability of the zero dynamics is also derived. Then, the I&I methodology, input/output feedback linearization, and PID position controllers are compared on the basis of their transient step response and robustness to external disturbance and parameter variations.College of EngineeringMultidisciplinary ProgramsMaster of Science in Mechatronics Engineering (MSMTR
Protecting Animals 36: Author Witi Ihimaera
No full textIn this very special episode of Knowing Animals I am joined by beloved New Zealand author Witi Ihimaera. Witi has written many books featuring nonhuman animals. He offers us a non-colonial lens through which to think about the human/nonhuman relationship
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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