Search results for "Hf"
showing 10 items of 909 documents
A physical-based constitutive model for surface integrity prediction in machining of OFHC copper
2017
International audience; Due to the rising interest in predicting machined surface integrity and sustainability, various models for metal cutting simulation have been developed. However, their accuracy depends deeply on the physical description of the machining process. This study aims to develop an orthogonal cutting model for surface integrity prediction, which includes a physical-based constitutive model of Oxygen Free High Conductivity (OFHC) copper. This constitutive model incorporates the effects of the state of stress and microstructure on the work material behavior, as well as a dislocation density-based model for surface integrity prediction. The coefficients of the constitutive mod…
Speed-dependent line profile: A test of a unified model from the Doppler to the collisional regime for molecule-molecule collisions
2000
International audience; A speed-dependent line profile combining soft and hard fully correlated Dicke-narrowing collisions was recently successfully tested on Ar-broadened H-2 spectra in a wide density and temperature range. A further test for mixtures of H-2 in nitrogen molecules (instead of Ar atoms) is presented. This test is also based on high resolution Raman investigation of the isotropic Q(1) line of H-2 from low to high density at various temperatures. The same consistency of the speed-dependent line profile as for H-2-Ar is obtained for H-2-N-2 through a remarkable agreement with all the data by using a unique set of four parameters (the collisional width and shift, the kinetic fre…
Forecasting Passenger Traffic for a Regional Airport
2019
Abstract The purpose of the present research is estimating the potential traffic for SIA (Sibiu International Airport, SBZ) for the year 2017. Predicting as accurate as possible the passenger traffic for a certain airport is an aspect of major importance for both the airport management and the airline companies. The theoretical quality of the forecasting models for air traffic of passengers is fundamental for obtaining the most accurate predictions. In this regard, a two-step process was used in developing the traffic forecasting model: (1) Identifying the proper regression model for traffic estimation based on the number of aircraft departures, and (2) Forecasting the number of aircraft de…
Airlines Customer Segmentation in the Hyper-Competition Era
2019
As the airline industry reaches its maturity, so do the passengers who are looking for more sophistication in terms of the products and services they buy or expect. Offering a large array of services to customers with different expectations who await customization along their journey has become more challenging for airlines all over the world. Coping with changes in a volatile environment means that airlines need to redefine their customer segmentation, evolving from a social-demographic to a more complicated behavioral approach which encompasses the whole traveling experience and the way airlines deliver at every touching point.
The Route Development Strategies of Romanian Airports: A Key Challenge in Modern Aviation
2018
Airport route development can be defined as a complex process carried out by airports, encouraging airlines to launch new routes or increase frequencies on already served destinations. The deregulated aviation environment helped airports to find new and innovative ways to compete directly with each other for a limited airline capacity, engaging with airlines and proving the airport route development strategy and airline needs meet at a certain point. The future prosperity of the communities the airports serve, depends on the efforts of the route development team and their focused aviation marketing strategy. A huge responsibility to attract what is best for the community as well as a good c…
Työn ominaisuuksien merkitys työn ja yksityiselämän välisen rajan hallinnassa
2019
Työn ja yksityiselämän välinen raja on nykyään monissa ammateissa häilyvä, koska työtä ei enää säätele aika ja paikka samassa määrin kuin ennen. Tässä tutkimuksessa etsitään vastausta kahteen pääkysymykseen. Ensinnäkin, millaisia tyylejä yksilöillä on hallita työn ja yksityiselämän välistä rajaa, kun huomioidaan sekä työasioiden kulkeutuminen yksityiselämään että yksityiselämän asioiden kulkeutuminen työhön? Toiseksi, määrittävätkö työn sisältämät vaatimukset ja voimavarat työn ja yksityiselämän rajanhallinnan tyylejä? Tutkimuksemme aineisto on kerätty keväällä 2013 verkkokyselyllä, johon osallistui 1106 eri ammattialoilla työskentelevää työntekijää. Aineistosta löytyi viisi työn ja yksityi…
The Efficiency of Ambulatory Medical Services. Case Study - The Integrated Ambulatory Units of the Psychiatric Hospital “Dr. Gheorghe Preda” Sibiu
2017
Healthcare costs are an important issue for developed countries, focusing on accessibility, the quality of service and financial efficiency. The global direction of health insurance systems is to resolve the case through primary care, ambulatory and day hospital care. Hospitalizations need to be reduced. In psychiatry, however, there is a particular situation due to the increased incidence of new cases that cannot be treated by ambulatory care units. Efforts have been made to develop ambulances and service accessibility, to capitalize on benefits and to provide quality to patients. Although the number of services rendered significantly increased, in psychiatry there is an increase in the nu…
Fact-checking y vigilancia del poder: La verificación del discurso público en los nuevos medios de América Latina
2018
El fact-checking ha experimentado un desarrollo importante en los últimos años, como técnica destinada a la verificación del discurso público, en un momento en que la difusión de noticias falsas o la pérdida de calidad y credibilidad de los medios alcanza cotas preocupantes. Este artículo analiza nueve iniciativas surgidas desde 2010 en media docena de países latinoamericanos, representativas de un ecosistema emergente en una región enfrentada a menudo con problemas para alcanzar una verdadera democracia mediática. Desde una aproximación cualitativa y cuantitativa, esta investigación compara la metodología de trabajo y las modalidades de evaluación que presentan, así como las temáticas y ac…
Supramolecular Structure and Antimicrobial Activity of Ni(II) Complexes with s-Triazine/Hydrazine Type Ligand
2023
The two complexes, [Ni(DPPT)2](NO3)2*1.5H2O (1) and [Ni(DPPT)(NO3)Cl].EtOH (2), were synthesized using the self-assembly of (E)-2,4-di(piperidin-1-yl)-6-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)-1,3,5-triazine (DPPT) with Ni(NO3)2*6H2O in the absence and presence of NiCl2*6H2O, respectively. In both cases, the neutral tridentate DPPT ligand is found coordinated to the Ni(II) via three N-atoms from the hydrazone, pyridine and s-triazine rings. Hence, the homoleptic complex 1 has a NiN6 hexa-coordination environment while two NO3− are counter anions in addition to one-and-a-half crystallized hydration water molecules are found acting as an outer sphere. The heteroleptic complex 2 has a NiN3O…
New Bioprecursor Prodrugs of Sulfadiazine: Synthesis, X-ray Structure and Hirshfeld Analysis
2022
Sulphonamide motif is found extensively in numerous chemotherapeutic drug candidates, it acts by stopping the production of folate inside the bacterial cell. Current research has established the synthesis and characterization of new bioprecursor prodrugs of sulfadiazine. The first prodrug, 3, was synthesized via the coupling of diazonium salt of sulfadiazine with ethyl acetoacetate in AcONa at 0 °C. The second prodrug, sulfadiazine-pyrazole, 5, was furnished via cyclocondensation of the hydrazono derivative, 3, and 2-pyridyl hydrazine, 4. The generated data from the X-ray analysis is interpreted and refined to obtain the crystal structure of the target compound, 5. Density functional th…