103,144 research outputs found
Selenium Chemisorption Makes Iron Surfaces Slippery
No full textIn the effort to reduce the energy consumption due to friction, finding new effective lubricants is of primary importance. Here we suggest selenium as a possible element for a highly effective lubricant on iron/iron interfaces by means of density functional theory. The adsorption properties of Se on the most stable iron surface are studied and the metal–adsorbate interaction is characterized. The adsorption reveals that selenium behaves similarly to sulfur and phosphorus, two key elements for high-pressure, anti-wear lubricant additives. The tribological properties of the Fe–Se/Se–Fe interface and the electronic modifications induced by the additive are then investigated and compared with Fe–P/P–Fe and Fe–S/S–Fe interfaces. The charge rearrangement at the interface and the density of states reveal the formation of strong covalent interactions inside the adsorbed layer of selenium atoms that weaken the metal–metal interaction. The calculated work of adhesion and ideal interfacial shear strength show that, with respect to P and S, Se possesses superior lubricating properties
G. Alpa et M. Bessone, I fatti illiciti
No full textG. Alpa et M. Bessone, I fatti illiciti. In: Revue internationale de droit comparé. Vol. 37 N°2, Avril-juin 1985. p. 467
I fatti catalani
No full textTavola rotonda organizzata dalla Associazione lucana G. Fortunato sulle recenti vicende politico-istituzionali in atto in Catalogna. Interventi di ANNA MARIA COMPAGNA (Filologia e linguistica romanza Univer- sità di Napoli Federico II), GENNARO FERRAIUOLO (Diritto Costituzionale Università di Napo- li Federico II), VALENTINA RIPA (Lingua e traduzione spagnola Università di Salerno); modera GINO GIACULLI (giornalista “Il Mattino”)
Center for research and care of aging : a strategy for an integrate approach
No full textThe effects of longevity, real revolution of this century, are producing significant impact on social and public health programs, on family life, economy, job placements and training of health care employees. Center for
Research and Care of Aging is an organical structure which tries to face up to preventive medicine with a close connection with Family Medicine, through a broad range of innovative and comprehensive programs in clinical care and education, closely related to biomedical research. The structure
is an University Training Center for junior faculty of Medicine, Nursing, Biotechnology and for Postgraduate students in Geriatric Medicine. Continuing Medical Education (CME) program in Geriatric Medicine and in Geriatric Rehabilitation is yearly planned.
The organical stucture extends for 30.000 sq.m. downtown in Milan, provides at the ground floor a variety of clinical services, radiology, an ambulatory care center with over 3000 patients weekly (80% are over 65 years old; at the first floor are simmetrically located a 12-bed inpatient Acute Care for the Elderly Unit and 4-bed and DH 18-bed inpatients Rehabilitation Unit
and 15-bed DH.Long-term care services are provided three floors up, in a 160-bed teaching nursing home with high standard of medical care. Patients with requiring intensive care can be admitted to Coronary Care Unit and Stroke Unit in the same hospital. This structure also provides 4000 sq.m. of laboratories dedicated to diagnostic assays and to research on neurobiology, endocrinology and metabolism, cardiovascular diseases, immunological disesases and longevity linked to both a clinical department and a basic science
department, to promote our goal of building a strong basic science program devoted to the study of clinically-relevant issues related to aging. Clinical geriatric researchers are working on search adequate tools for a good management of older patients with multiple chronic conditions, to better define diagnostic and therapeutic courses of a given individual. Electronic health records (EHR) are being developed to improve communication as health information follows patients from one care setting to another (Acute care and Rehabilitation Unit, Nursing home) reducing fragmentation of services for seniors transitioning from one level of care to another and from one
health care system to another. EHR systems must accommodate information germane to a senior frail population, including, but not limited to, functional assessments, cognitive assessments, and information on advance directives to correctly choose location and practice setting of patients. The EHR should provide prompts on prevention relevant to seniors and on potential errors, e.g. drug-drug interactions or excessive dosing, specific for older adults
Ab Initio Study of Polytetrafluoroethylene Defluorination for Tribocharging Applications
No full textPolytetrafluoroethylene (PTFE) is one of the most efficient polymers for green energy-harvesting devices like triboelectric nanogenerators because of its high capability of acquiring and retaining negative charge. Despite its extensive use, the relation between PTFE triboelectric behavior and its electronic properties has never been analyzed. To shed light on this important feature, we have studied the electronic properties of PTFE low-index surfaces in the high-pressure phase by means of density functional theory. We start by showing that adding either a positive or a negative charge on pristine surfaces is energetically unfavorable. We then demonstrate the role played by surface defects. When a surface fluorine vacancy is introduced, the analysis of the band structure reveals that the defect generates a trap state that enables the surface to acquire and retain negative charge
Fatti, verità e mondi possibili
No full textIl saggio difende una forma di realismo metafisico mettendo in luce l'infondatezza di una popolare obiezione all'oggettività dei fatti. Il nocciolo dell'argomento è che la conclusione che i fatti non sono altro che costruzioni sociali non segue dalla constatazione che se non avessimo (ad esempio) i concetti di dinosauro e di fatto non potremmo dire e pensare che è un fatto che sono esistiti i dinosauri
L'azione dei fatti futuri. I possibili
No full textIntroduzione, traduzione e note di due importanti articoli di G. Tarde, "I possibili" e "L'azione dei fatti futuri"
Phosphorus Adsorption on Fe(110): An ab Initio Comparative Study of Iron Passivation by Different Adsorbates
No full textFrom corrosion protection to embrittlement and lubrication, the presence of phosphorus at iron surfaces is critical for a range of processes and applications. However, phosphorus adsorption on iron has never been studied experimentally or theoretically. Here P chemisorption on the most stable surface of iron is analyzed by means of density functional theory. The most stable adsorption geometry and coverage are identified, and the changes induced by P adsorption on the structural and electronic properties of the metal are discussed. A systematic comparison among P, S, N, and O uncovers a peculiar behavior of the P and S species: attractive adatom-adatom interactions at high coverage lead to the formation of two-dimensional overlayers that reduce the metal reactivity and work function. This effect is important in iron embrittlement and for the functionality of P- and S-containing additives included in lubricant oils
La buona fede nella teoria dei fatti giuridici di diritto privato / Rodolfo Sacco
No full textLa buona fede nella teoria dei fatti giuridici di diritto privato / Rodolfo Sacco
Torino : G. Giappichelli, stampa 1949
XII, 293 p. ; 25 cm
Il baule di Tarde. Genealogia filosofica di un sociologo controcorrente
No full textIntroduzione agli scritti di G. Tarde, I possibili. L'azione dei fatti futuri (Orthotes, Napoli-Salerno, 2013
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