bluuebunny/crossref_metadata_2025 huggingface dataset:
Contribution à l'étude de la définition des sépiolites
Authors: Migeon Georges
Published: November 2018

Nous avons cherché à établir des caractéristiques spécifiques nouvelles des sépiolites et avons associé pour ce faire aux méthodes chimiques trois méthodes physiques : diffraction des rayons X, courbes de déshydratation, courbes dilatométriques.

L'adaptation de ces deux dernières méthodes a constitué une partie de notre travail.

Nous avons montré que la conjugaison des enseignements fournis par ces divers procédés mettait en évidence
Théorie dynamique de la diffraction des rayons X par les cristaux déformés
Authors: Taupin Daniel
Published: November 2018

La théorie dynamique classique de la diffraction des rayons X est étendue au cas des cristaux ayant subi une déformation quelconque et des ondes non planes. La méthode consiste à résoudre les équations de Maxwell en considérant les déformations et la courbure des ondes comme des perturbations du premier ordre.

On obtient ainsi un système différentiel simple dont la résolution n'est en général possible que numériquement.

Une application particulière est faite au cas des cristaux courbés. On en déduit une méthode numérique simple de calcul du pouvoir réflecteur des cristaux courbés. Le résultat de mesures absolues est en bon accord avec la théorie.

On expose ensuite une méthode approximative de calcul de l'augmentation du pouvoir réflecteur due à la présence de dislocations. La comparaison avec les mesures est satisfaisante.

Enfin on donne quelques résultats de la résolution numérique directe du système fondamental dans le cas de dislocations isolées. Ceci permet de prévoir la structure des images de dislocations obtenues par transmission. Ici encore on note un accord satisfaisant avec les expériences faites par plusieurs autres auteurs.
Structure de γ-LiAlO2
Authors: Lewy-Bertaut Erwin Félix , Delapalme A. , Bassi Gérard , Durif-Varambon André , Joubert Jean-Claude
Published: November 2018

γ-LiAlO₂ cristallise dans le groupe P4₁2₁2 ; a = 5,17 Å et c = 6,295 Å. Les tétraèdres AlO₄ s'enchaînent comme les tétraèdres SiO₄ dans la cristobalite SiO₂ quadratique, forme basse température. Li se trouve dans les lacunes tétraédriques. Les paramètres atomiques sont donnés.
Contribution à l'étude structurale des silicates de cuivre : structure atomique de la papagoïte
Authors: Guillebert Claire , Le Bihan Marie-Thérèse
Published: November 2018

Les cristaux de papagoïte sont monocliniques : a = 12,94, b = 11,52, c = 4,68 Å, β = 100°30'.

La formule chimique structurale est la suivante :

Cu₂Ca₂Al₂ (Si₄O₁₂) (OH)₆ avec Z = 2.

Le groupe spatial : C 2/m a été confirmé par l'analyse structurale.

L'étude de la structure a été conduite de façon classique.

Cette structure est constituée d'anneaux isolés, composés chacun de 4 tétraèdres, formant des groupements Si₄O₁₂ ; chacun de ces anneaux présente la symétrie 2/m, et admet pour éléments de symétrie ceux-là mêmes de la maille élémentaire.

Les atomes de calcium, d'aluminium et de cuivre sont localisés en des positions particulières de multiplicité 4, et jouent, dans cette structure, des rôles nettement différents.

L'atome de cuivre est pentacoordonné ; il est lié très fortement à 2 atomes d'oxygène appartenant à 2 tétraèdres faisant partie du même anneau, et moins fortement à 3 groupements (OH).
Étude à la microsonde électronique d'un chondre d'olivine et d'un fragment riche en cristobalite de la météorite de Nadiabondi
Authors: Christophe Michel-Lévy Mireille , Curien Hubert , Goñi Juan C.
Published: November 2018

Le chondre est formé de barres d'olivine à 22 ± 1 % fa. et d'une matière interstitielle où se concentrent Ca et Al. Dans la même plaque mince, se trouve un grain de cristobalite de 1,5 mm de plus grande dimension, ourlé de pyroxène.
Morphologie et remplissage des dolines du Causse de Martel d'après les observations réalisées au cours du diagnostic archéologique de l'aérodrome de Brive-Souillac (Corrèze et Lot)
Authors: Bruxelles Laurent , Colonge David , Salgues Thierry
Published: November 2018

Une opération de diagnostic archéologique a été menée par l'INRAP sur le Causse de Martel. À cette occasion, 610 sondages à la pelle mécanique ont été réalisés, localisés majoritairement dans le fond des dolines.

La morphologie des dépressions présente le plus souvent une dissymétrie nette. On observe donc un versant en pente douce sous-tendu par la présence d'altérites sableuses. Il s'oppose à une bordure de corrosion assez raide développée dans les calcaires bathoniens. Les coupes relevées montrent une accumulation de plusieurs mètres de sédiments variés. Ainsi, à la base, on trouve des dépôts périglaciaires (grèzes et limons jaunes) qui ont fossilisé des vestiges archéologiques du Paléolithique moyen. Juste au-dessus, des argiles brunes à cailloutis calcaire reposent en discordance. Grâce à la présence de matériel archéologique, on peut caler la mise en place de ce niveau depuis la Protohistoire jusqu'à l'époque médiévale. Enfin, un à deux mètres de colluvions agricoles modernes terminent la séquence. Ces observations mettent donc en évidence au moins deux périodes principales de colmatage de ces dolines.

Elles correspondent à deux phases majeures de déséquilibre des versants. La première est d'ordre climatique (périglaciaire) et la seconde d'origine anthropique (déboisements et mise en culture). Ces accumulations reposent sur les formations sous-jacentes par l'intermédiaire de surfaces d'érosion nettes. Ces dernières matérialisent des reprises du soutirage karstique et l'érosion d'une partie du remplissage de la doline. Ce fonctionnement correspond également à des périodes pendant lesquelles les apports colluviaux sont moins importants et traduit donc une certaine stabilité des versants.

Enfin, la morphologie du substrat rocheux et la géométrie des dépôts montrent que le paysage karstique, nettement plus différencié avant la Protohistoire, a subi un important colmatage. Il empâte la base des morphologies karstiques qui se présentent aujourd'hui sous la forme de dolines à fond plat.
Valorisation patrimoniale et dynamiques territoriales autour d'un site karstique emblématique : le poljé de Cerknica (Slovénie)
Authors: Duval Mélanie
Published: November 2018

Heritage valorization and territorial dynamics around an emblematic karstic site : the polje of Cerknica (Slovenia)

Centered on the polje of Cerknica (Slovenia), this paper proposes a sociogeographic approach of a karstic site considered as emblematic. We will deal with the question in which measure the site of Cerknica is marked by construction works as opposed to the heritage valorization of its physical, faunistic and floristic characteristics.

In fact, the polje of Cerknica is emblematic in many points of view ! It became a scientific curiosity already in early times. From the XVIth century, the functioning of its temporary lake raises questions to the European scientific community, which tries to explain the mystery of the lake of Cerknica. This fascination for the polje of Cerknica contributed gradually to the perception as «haut lieu» of Slovenian and paneuropean karstic landscapes.

At the same time, the polje of Cerknica became the heart of the local life space : the seasonal variations of the waterlevel allow the inhabitants of the neighborhood to satisfy their needs. Therefore, the polje of Cerknica also became emblematic because of the complementarity of the economic activities which it allows.

This atypical dimension can be found again while reading about the oversized projects of development conceived for the polje : dewatering for the needs of agriculture, permanent lake to produce hydro-electricity or to build a tourist complex, are only some of the many projects which marked the XXth century and contributed to highlight the features of this karstic site.

Scientific curiosity, place of resource for the local populations, object of economic greeds, the polje is today marked by heritage valorization. The creation of a regional park allows the local stakeholders to assert their legitimations, to mark their territory and to think about their future in terms of sustainable development.
Courbet, peintre du calcaire
Authors: Fumey Gilles
Published: November 2018

Natif d'Ornans, en Franche-Comté, Gustave Courbet a laissé de nombreuses toiles représentant les paysages des gorges de la Loue. Les phénomènes du calcaire tiennent ainsi une grande place dans son oeuvre, et donnent à Courbet autant d'occasions d'illustrer le courant réaliste. Courbet apparaît comme un observateur avisé des formes et de la roche, et, accompagnant les progrès de la science, ses tableaux témoignent d'un renouvellement du regard sur la nature au milieu du XIXème siècle.
Early Detection of Imminent Encapsulating Peritoneal Sclerosis: Free Water Transport, Selected Effluent Proteins, or Both?
Authors: Barreto Deirisa Lopes , Sampimon Denise E. , Struijk Dirk G. , Krediet Raymond T.
Published: November 2018

Background

No diagnostic tool or methodology is currently available for early detection of imminent encapsulating peritoneal sclerosis (EPS). The objective of this study was to investigate the predictive value of free water transport (FWT) and construct a panel of peritoneal effluent proteins for EPS alone or in combination with FWT. These parameters could be incorporated in the follow-up of peritoneal dialysis (PD) patients.

Methods

A case-control study, nested in a longitudinal PD patient cohort, was conducted. Time-specific areas under the receiver operating characteristic (ROC) curve were calculated for FWT and effluent biomarkers at a lag time up to 3 years before EPS diagnosis. Free water transport was combined with appearance rates (AR) of biomarkers to assess their clinical validity.

Results

Free water transport volume and AR of effluent bio-markers were investigated in 11 EPS patients and 34 long-term PD patients. Diagnostic performance was best for FWT (area under the curve [AUC] 0.94) followed by plasminogen activator inhibitor (PAI-1) AR. Throughout, diagnostic panels of FWT and AR of cancer antigen 125 (CA125), interleukin-6 (IL-6), or (PAI-1) yielded specificity estimates above 84%. The combination of FWT and PAI-1 AR identified the largest proportion of EPS patients at 1 year prior to diagnosis (sensitivity 100%, specificity 94%).

Conclusion

Measurement of FWT is simple and has the highest predictive value for imminent EPS. The addition of effluent biomarkers provides an all-round insight into the state of the peritoneum. Our data indicate that combining FWT with either PAI-1, CA125, or IL-6 has the highest specificity. This is required to avoid unnecessary discontinuation of PD treatment.
AN INTIUTIONISTIC FUZZY MULTI-EXPERT AND MULTI-CRITERIA SYSTEM FOR EFFECTIVE PERFORMANCE MANAGEMENT
Authors: Beskese Ahmet , Kahraman Cengiz , Buyukbay Shirli Ender , Bozbura Faik Tunc
Published: November 2018

Organizations, in their pursuit of accomplishing their vision and goals, need effective management of human resources. Performance Management, among other Human Resources Management (HRM) practices, is the central function, as it delivers the necessary data that complements and enables the other functions. Building an effective performance management system is a multicriteria problem that requires contribution from experts having diverse backgrounds. Moreover, performance management is an inherently vague concept since almost the whole process requires linguistic assessments rather than numerical ones. Hence, to handle all those issues, an intuitionistic fuzzy multi-criteria and multi-expert analytical hierarchy process (AHP) based management model is proposed in this paper. In the determination of the criteria weights of the model, both the aggregated and compromised assessments of the experts are used in order to observe the effects of these two methods on the results. A numerical application is given to illustrate the use of the model.
Missing Gamma-Ray Halos and the Need for New Physics in the Gamma-Ray Sky
Authors: Broderick Avery E. , Tiede Paul , Chang Philip , Lamberts Astrid , Pfrommer Christoph , Puchwein Ewald , Shalaby Mohamad , Werhahn Maria
Published: November 2018

An intergalactic magnetic field (IGMF) stronger than 3 × 10−13 G would explain the lack of a bright, extended degree-scale, GeV-energy inverse Compton component in the gamma-ray spectra of TeV blazars. A robustly predicted consequence of the presence of such a field is the existence of degree-scale GeV-energy gamma-ray halos (gamma-ray bow ties) about TeV-bright active galactic nuclei, corresponding to more than half of all radio galaxies. However, the emitting regions of these halos are confined to and aligned with the direction of the relativistic jets associated with gamma-ray sources. Based on the orientation of radio jets, we align and stack corresponding degree-scale gamma-ray images of isolated Fanaroff–Riley class I and II objects and exclude the existence of these halos at overwhelming confidence, limiting the intergalactic field strength to <10−15 G for large-scale fields and progressively larger in the diffusive regime when the correlation length of the field becomes small in comparison to 1 Mpc. When combined with prior limits on the strength of the IGMF, this excludes a purely magnetic explanation for the absence of halos. Thus, it requires the existence of novel physical processes that preempt the creation of halos, e.g., the presence of beam-plasma instabilities in the intergalactic medium or a drastic cutoff of the very high-energy spectrum of these sources.
Atomic Data on Inelastic Processes in Low-energy Lithium–Hydrogen Collisions
Authors: Belyaev Andrey K. , Voronov Yaroslav V.
Published: November 2018

The cross sections and the rate coefficients for mutual neutralization, ion-pair formation, excitation, and de-excitation processes in low-energy Li + H and Li+ + H− collisions are calculated for all transitions between the seven lowest-lying atomic lithium states and the ionic state for the collision energy range 0.01–100 eV and the temperature range 1000–10,000 K. The calculations are performed by the quantum probability current method based on the accurate adiabatic potentials. The present rate coefficients for the mutual neutralization processes are in perfect agreement with the available full quantum data. For the excitation and de-excitation processes, the present data are more accurate than the previous rates. The processes with large and moderate rates are singled out. Additional calculations made by the quantum multichannel approach show that the reaction mechanism of these processes is mainly based on the long-range ionic–covalent interaction. The processes with large and moderate rates are important for astrophysical applications.
Setting the Stage for Cosmic Chronometers. I. Assessing the Impact of Young Stellar Populations on Hubble Parameter Measurements
Authors: Moresco Michele , Jimenez Raul , Verde Licia , Pozzetti Lucia , Cimatti Andrea , Citro Annalisa
Published: November 2018

The expansion history of the universe can be constrained in a cosmology-independent way by measuring the differential age evolution of cosmic chronometers. This yields a measurement of the Hubble parameter H(z) as a function of redshift. The most reliable cosmic chronometers known so far are extremely massive and passively evolving galaxies. Age-dating these galaxies is, however, a difficult task, and even a small contribution of an underlying young stellar population could, in principle, affect the age estimate and its cosmological interpretation. We present several spectral indicators to detect, quantify, and constrain such contamination in old galaxies and study how their combination can be used to maximize the purity of cosmic chronometers selection. In particular, we analyze the Ca ii H/K ratio, the presence (or absence) of Hα and [O ii] emission lines, higher-order Balmer absorption lines, and UV flux; each indicator is especially sensitive to a particular age range, allowing us to detect young components ranging between 10 Myr and 1 Gyr. The combination of these indicators minimizes the contamination to a level below 1% in the case of ideal data. More importantly, it offers a way to control the systematic error on H(z) as a function of the contamination by young stellar populations. We show that for our previous measurements of the Hubble parameter, the possible bias induced by the presence of a younger component is well below the current errors. We envision that these indicators will be instrumental in paving the road for a robust and reliable dating of the old population and its cosmological interpretation.
Observational Constraints on the Tilted Spatially Flat and the Untilted Nonflat ϕCDM Dynamical Dark Energy Inflation Models
Authors: Park Chan-Gyung , Ratra Bharat
Published: November 2018

We constrain spatially flat tilted and nonflat untilted scalar field (ϕ) dynamical dark energy inflation (ϕCDM) models by using Planck 2015 cosmic microwave background (CMB) anisotropy measurements and recent baryonic acoustic oscillation distance observations, Type Ia supernovae apparent magnitude data, Hubble parameter measurements, and growth rate data. We assume an inverse power-law scalar field potential energy density

. We find that the combination of the CMB data with the four non-CMB data sets significantly improves parameter constraints and strengthens the evidence for nonflatness in the nonflat untilted ϕCDM case from 1.8σ for the CMB measurements only to more than 3.1σ for the combined data. In the nonflat untilted ϕCDM model, current observations favor a spatially closed universe with spatial curvature contributing about two-thirds of a percent of the present cosmological energy budget. The flat tilted ϕCDM model is a 0.4σ better fit to the data than is the standard flat tilted ΛCDM model: current data allow for the possibility that dark energy is dynamical. The nonflat tilted ϕCDM model is in better accord with the Dark Energy Survey bounds on the rms amplitude of mass fluctuations now (σ
8) as a function of the nonrelativistic matter density parameter now (Ω
m
) but it does not provide as good a fit to the larger-multipole Planck 2015 CMB anisotropy data as does the standard flat tilted ΛCDM model. A few cosmological parameter value measurements differ significantly when determined using the tilted flat and the untilted nonflat ϕCDM models, including the cold dark matter density parameter and the reionization optical depth.
Magnetic Flux Reconnection in Flaring Active Regions with Sustained Gamma-Ray Emission
Authors: Kahler S. W. , Cliver E. W. , Kazachenko M.
Published: November 2018

Characteristics of sustained >100 MeV γ-ray emission (SGRE) events observed by the Large Area Telescope on Fermi were recently reported by Share et al. Their spectra are consistent with the decay of pions produced by >300 MeV protons and appear spectrally and spatially distinct from preceding associated flares. The source(s) of the sustained production of the >300 MeV protons is uncertain, but acceleration in coronal/interplanetary shock waves driven by coronal mass ejections, followed by a return of the protons back to the Sun, is favored. This scenario requires proton transport through converging magnetic fields behind the shock, which might result in considerable reflection of the protons back into space, and 1 au observations of the associated solar energetic proton (SEP) events do not always include a population of E > 300 MeV protons. Alternative source candidates that involve trapping or continued acceleration of SEPs in coronal loops have been considered. The energy release rates from magnetic reconnection in flaring active regions (ARs) have been measured with a new technique, and in this work we compare those measured flux reconnection rates with emission profiles in 11 SGRE events. In general, the magnetic reconnection event is nearly or completely finished before the bulk of the γ-ray emission, which argues against scenarios of continued proton acceleration in the flaring ARs.
CME-driven Shock and Type II Solar Radio Burst Band Splitting
Authors: Chrysaphi Nicolina , Kontar Eduard P. , Holman Gordon D. , Temmer Manuela
Published: November 2018

Coronal mass ejections (CMEs) are believed to be effective in producing shocks in the solar corona and interplanetary space. One of the important signatures of shocks and shock acceleration are Type II solar radio bursts that drift with the shock speed and produce bands of fundamental and higher harmonic plasma radio emission. An intriguing aspect of Type II radio bursts is the occasional split of a harmonic band into thinner lanes, known as band splitting. Here we report a detailed imaging and spectroscopic observation of a CME-driven shock producing band splitting in a Type II burst. Using LOFAR, we examine the spatial and temporal relation of the Type II burst to the associated CME event, use source imaging to calculate the apparent coronal density, and demonstrate how source imaging can be used to estimate projection effects. We consider two widely accepted band-splitting models that make opposing predictions regarding the locations of the true emission sources with respect to the shock front. Our observations suggest that the locations of the upper and lower subband sources are spatially separated by ∼0.2 ± 0.05 R
⊙. However, we quantitatively show, for the first time, that such separation is consistent with radio-wave scattering of plasma radio emission from a single region, implying that the split-band Type II sources could originate from nearly cospatial locations. Considering the effects of scattering, the observations provide supporting evidence for the model that interprets the band splitting as emission originating in the upstream and downstream regions of the shock front, two virtually cospatial areas.
Fast Ion Heating in Transient Collisionless Magnetic Reconnection via an Intrinsic Stochastic Mechanism
Authors: Yoon Young Dae , Bellan Paul M.
Published: November 2018

Stochastic heating has been known to be a powerful ion heating mechanism in the solar wind, atmosphere, and flares. In this Letter, we show that stochastic ion heating is inherent to transient collisionless magnetic reconnection. The explanation exploits the connected nature of electron canonical vorticity to show analytically that the in-plane electric and magnetic fields in a typical reconnection geometry satisfy the condition for stochastic heating of ions. Electron fluid simulations, test ion simulations, and comparisons to experiments all support the existence of this mechanism.
Extreme-ultraviolet Radiation from A-stars: Implications for Ultra-hot Jupiters
Authors: Fossati L. , Koskinen T. , Lothringer J. D. , France K. , Young M. E. , Sreejith A. G.
Published: November 2018

Extremely irradiated, close-in planets to early-type stars might be prone to strong atmospheric escape. We review the literature showing that X-ray-to-optical measurements indicate that for intermediate-mass stars (IMSs) cooler than ≈8250 K, the X-ray and extreme-ultraviolet (XUV) fluxes are on average significantly higher than those of solar-like stars, while for hotter IMSs, because of the lack of surface convection, it is the opposite. We construct spectral energy distributions for prototypical IMSs, comparing them to solar. The XUV fluxes relevant for upper-planet atmospheric heating are highest for the cooler IMSs and lowest for the hotter IMSs, while the ultraviolet (UV) fluxes increase with increasing stellar temperature. We quantify the influence of this characteristic of the stellar fluxes on the mass loss of close-in planets by simulating the atmospheres of planets orbiting EUV-bright (WASP-33) and EUV-faint (KELT-9) A-type stars. For KELT-9b, we find that atmospheric expansion caused by heating due to absorption of the stellar UV and optical light drives mass-loss rates of ≈1011 g s−1, while heating caused by absorption of the stellar XUV radiation leads to mass-loss rates of ≈1010 g s−1, thus underestimating mass loss. For WASP-33b, the high XUV stellar fluxes lead to mass-loss rates of ≈1011 g s−1. Even higher mass-loss rates are possible for less massive planets orbiting EUV-bright IMSs. We argue that it is the weak XUV stellar emission, combined with a relatively high planetary mass, which limit planetary mass-loss rates, to allow the prolonged existence of KELT-9-like systems.
Small nuclear power plants for power supply in arctic regions: assessment of spent nuclear fuel radioactivity
Authors: Naumov Vadim , Gusak Sergey , Naumov Andrey
Published: November 2018

The purpose of the present study is the investigation of mass composition of long-lived radionuclides accumulated in the fuel cycle of small nuclear power plants (SNPP) as well as long-lived radioactivity of spent fuel of such reactors. Analysis was performed of the published data on the projects of SNPP with pressurized water-cooled reactors (LWR) and reactors cooled with Pb-Bi eutectics (SVBR). Information was obtained on the parameters of fuel cycle, design and materials of reactor cores, thermodynamic characteristics of coolants of the primary cooling circuit for reactor facilities of different types. Mathematical models of fuel cycles of the cores of reactors of ABV, KLT-40S, RITM-200M, UNITERM, SVBR-10 and SVBR-100 types were developed. The KRATER software was applied for mathematical modeling of the fuel cycles where spatial-energy distribution of neutron flux density is determined within multi-group diffusion approximation and heterogeneity of reactor cores is taken into account using albedo method within the reactor cell model. Calculation studies of kinetics of burnup of isotopes in the initial fuel load (235U, 238U) and accumulation of long-lived fission products (85Kr, 90Sr, 137Cs, 151Sm) and actinoids (238,239,240,241,242Pu, 236U, 237Np, 241Am, 244Cm) in the cores of the examined SNPP reactor facilities were performed. The obtained information allowed estimating radiation characteristics of irradiated nuclear fuel and implementing comparison of long-lived radioactivity of spent reactor fuel of the SNPPs under study and of their prototypes (nuclear propulsion reactors). The comparison performed allowed formulating the conclusion on the possibility in principle (from the viewpoint of radiation safety) of application of SNF handling technology used in prototype reactors in the transportation and technological process layouts of handling SNF of SNPP reactors.
Interfacial Shear, Tensile Strength and Young Modulus of Kenaf Fiber: The Effects from Different Settings of Alkali Treatment
Authors: Hashim Mohd Yussni , Amin Azriszul Mohd , Marwah Omar Mohd Faizan , Othman Mohd Hilmi , Johar Muhammad Akmal , Huat Ng Chuan , Mamat S.B.
Published: November 2018

The project explained about what happened to fiber matrix interfacial shear strength, fiber tensile strength and fiber Young modulus when different alkali treatment settings were applied. Kenaf fiber were exposed to different alkali concentration, immersion duration and immersion temperature. To determine the interfacial shear strength (IFSS), unsaturated polyester matrix was utilised to expose the properties. The effects of alkali treatment on sample mechanical properties were successfully evaluated, whereby the treated sample's IFSS showed slightly higher value compared to untreated kenaf fiber at all settings. Meanwhile, the IFSS value was increased at low alkali concentration and decreased with the increment of alkali concentration percentage. On the other hand, untreated kenaf fiber tensile strength and Young modulus average value was 632MPa and 40.65GPa respectively. It was also established that the sample's tensile strength was keep reducing after treatment at all settings. At 30 minutes constant immersion duration, the percentage of kenaf fiber tensile strength decrement was 42.57% when other treatment settings increased. Furthermore, a decline pattern was obtained in term of sample tensile strength and Young modulus when the alkali treatment increased at all settings.
Effects of Cutting Parameters on Tool Wear and Thrust Force in Drilling Nickel-Titanium (NiTi) Alloys Using Coated and Uncoated Carbide Tools
Authors: Rosnan Rosmahidayu , Azmi Azwan Iskandar , Murad Muhamad Nasir
Published: November 2018

The difficulties of machining nickel-titanium alloys are due to their high ductility and super-elasticity, strong strain-hardening, and excellent wear resistance. These characteristics lead to poor chip breakability, high cutting forces, rapid and aggressive tool-wear, as well as excessive burr formation during mechanical machining processes. The present study addresses these issues by evaluating the effects of drilling parameters and drill bit coatings on the growth of tool wear and development of the drilling thrust force. The findings from this research indicate that the TiAlN coated carbide drill was found to significantly improve the wear resistance of the cutting tool. Likewise, the results of thrust force development are consistent with the trends of tool wear growth for all of the tested carbide drills.
Rhizophora apiculata Extract as Corrosion Inhibitor in 3.5% NaCl for API 5L Steel
Authors: Gapsari Femiana , Setyarini Putu Hadi , Ganda Andita N.F.
Published: November 2018

The corrosion inhibition efficiency of Rhizophora acipulata(RA) extract was investigated for API 5L Steel corrosion in 3.5% NaCl using weight loss and polarization method. Fourier Transform Infra-Red (FTIR) was used toanalyze the characteristics of extract RA functional groups. The weight loss and polarization result indicated that extract RA inhibited API 5L steel corrosion rate. Based on the polarization result, the inhibition efficiency reached up 97.52% with addition 100ppm of RA extract.
Analysis of export problems in international market for Indian electrical equipment industry at power distribution sector
Authors: Thangamani T. , Kamaraj M.
Published: November 2018

Export of engineering products is one of major income of the nation. This research article focused on the export problems of Indian Electrical Equipment at power distribution sector. This study has analyzed the different dimensions of export problems perceived by the exporters at power distribution sector of Electri cal Equipment industry. The exporter category namely contractors, retailers, traders are selected and their perspectives are obtained. The members of Indian Electrical & Electronics Manufacturing Association (IEEMA) were considered as population and the primary data were collected from 500 organization’s executives in an exhibition conducted by IEEMA and a well-designed pre-tested questionnaire was used to collect the primary data regarding their export problems. The different dimensions of export problems were categorized into procedural problems, informational problems, international marketing problems, export oriented production problems, financial problems, environmental problems, HR problems. The result of the study shows that financial and environmental problems are the major issues in the export of Indian electrical equipments. This research study suggests that exporters should frequently visit foreign countries to have contact with buyer which will improve the performance of export with respect to product quality, technology, brand image, packaging and transportation, adequate attention and resource commitment. And also recommends to export promotion body should open branch offices or tie-up with marketing agencies of different countries to collect the latest information relating to business practices, competitive environment, cultural and social environment, political, economic and other market related information. The present study pointed out the scope for further research like, managerial characteristics and its influence on exports may be studied, conducting further studies in the similar area, pricing, inflation, currency exchange problems to be concentrated and study of marketing behavior from view of importers or buyers to understand their needs and expectations
Testing for long memory in the LKR/USD exchange rate: Evidence from Sri Lanka
Authors: Sivarajasingham S , Balamurali N.
Published: November 2018

The question of whether exchange rate markets are efficient or not, is directly related to whether or not long memory is pr esent in the exchange rate changes. Therefore, this paper explores the nature of the data generating processes of foreign exchange rate LKR against the US Dollar (USD), (LKR/USD) by examining the long memory properties of the LKR/USD return series based on econophysics models. In this study, autocorrelation function and spectral density function are used as visual test to inspect long memory of exchange rate returns. Further, parametric-ARFIMA model, Semi-parametric test proposed by Geweke and Porter-Hudak, Local Whittle estimator and non-parametric (R/S) test are employed as inferential tests to examine the long memory properties of the LKR/USD using daily data for the period from 2005-01-03 to 2016-12-30. Kernel density of LKR/USD return series show peak and fat tail postures. Visual inspection and inferential results reveal strong evidence of long memory property in the daily LKR/USD exchange rate return. It indicates that pricing by the market participants is not efficient. The results of this study have policy implications for traders and investors in designing and implementing trading strategies. It can also be helpful in predicting expected future return. Thus, the results of this study should be useful to regulators, practitioners and investors.
Factors influencing integrating conflict management
Authors: Safeena M.G.H. Sithy , Velnampy T.
Published: November 2018

Conflicts are unavoidable in any organizations since it is a natural, everyday phenomenon in each individual, each group or organization. It can be arised at anytime and anywhere in personal, academic and professional life. Though it is impossible to avoid, it is possible to manage. If it is not managed effectively it leads to increase the stress, reduce the organizational performance and negatively impacts on health and comfort of employees. There are five different conflict management strategies such as forcing, integrating, compromising, obliging and avoiding those are being mostly used in organizations or personal life when conflict arises. Among these five strategies, integrating is the effective strategy which increases the individual performance and organizational performance. The objective of this study is to find out the factors influencing on integrating conflict management strategy among university teachers. For this study the primary data were collected from randomly selected 1197 permanent academic staff by using the structured questionnaire from all 15 state Universities in Sri Lanka. The collected data were analyzed by using the Principal Component Analysis (PCA). Results of this study revealed that there are four factors such as (1) Investigate an issue with others (2) Minimize the difference among others (3) Emotional support to others (4) Trust others are influencing to apply the integrating strategy when the academic staff falls in conflict. Further, researchers suggested that those who wish to reduce the stress and create the peaceful environment within the organization and their personal life need to investigate an issue with others, minimize the difference among others, provide emotional support and trust others.
Job satisfaction and intent to leave among graduate teachers in Government Schools in Sri Lanka: Special reference to Jaffna District
Authors: Kanojan K. , Sivalogathasan V.
Published: November 2018

Job satisfaction is essential to employees to perform their duties effectively. Teachers’ job satisfaction and their intention to leave is not only important to teachers themselves but also it is very much essential to educational institutions and students as well. The purpose of this study was to find out the level of job satisfaction and intent to leave among Graduate Teachers in Government Schools in Jaffna District along with personal characteristics and job characteristics factors. This study was a quantitative approach and used the questionnaire for data collection. 200 graduate teachers participated. The findings indicated that the level of satisfaction of income, working condition and intrinsic reward was low, moderate, and moderate respectively. Also, these three independent variables influence teachers’ intention to leave. Further, this study found that personal characteristics such as; age, gender, marital status, and qualification and job characteristics such as teaching experience, present position, school level, subjects teaching and preferred subjects have no significant relationship with intention to leave. The results of this study support to achieve the organizational effectiveness by studying the impact of job satisfaction and intent to leave among graduate teachers in government schools, and suggest policies or practices that can be used to enhance the employee job satisfaction and organizational performance.
Новый подход в вопросе существования периодических решений для функционально-дифференциальных уравнений точечного типа
Authors: Beklaryan Leva Andreevich
Published: November 2018

Работа посвящена новому типу достаточных условий существования периодических решений для обыкновенных дифференциальных уравнений, а также функционально-дифференциальных уравнений точечного типа. Такие условия основаны на учете асимптотических свойств решений дифференциальных уравнений, которые не использовались при изучении периодических решений, так как рассматривались сужения таких уравнений на интервал, равный периоду.
Библиография: 9 наименований.
Тригонометрические факторизации последовательности Хорадама и сопутствующей ей последовательности
Authors: Siar Zafer
Published: November 2018

Рассмотрена последовательность Хорадама $\{W_n\}$ и сопутствующая ей последовательность $\{X_n\}$, удовлетворяющие рекуррентным соотношениям второго порядка. В качестве обобщения известных результатов приведены новые результаты о факторизации этих последовательностей. Они получены с помощью выражения членов указанных последовательностей через определители тридиагональных матриц и с использованием полиномов Чебышeва второго рода.
Библиография: 14 наименований.
Обобщенная конструкция Куммера и кольца когомологий $G_2$-многообразий
Authors: Taimanov Iskander Asanovich
Published: November 2018

Показано, как с помощью теории пересечений вычислять кольца когомологий $G_2$-многообразий, которые строятся с помощью обобщенной конструкции Куммера. Для одного примера найдены образующие кольца рациональных когомологий и их произведения.
Библиография: 19 названий.
Биллиардные книжки моделируют все трехмерные бифуркации интегрируемых гамильтоновых систем
Authors: Vedyushkina Viktoriya Viktorovna , Kharcheva Irina Sergeevna
Published: November 2018

В работе вводится новый класс биллиардов - биллиардные книжки, являющиеся интегрируемыми гамильтоновыми системами. Оказывается, что для любой невырожденной трехмерной бифуркации (3-атома) алгоритмически строится биллиардная книжка, в которой возникает такая бифуркация. Следовательно, любая интегрируемая гамильтонова невырожденная динамическая система с двумя степенями свободы моделируется в некоторой окрестности критического слоя слоения Лиувилля в изоэнергетическом 3-многообразии при помощи биллиарда.
Библиография: 25 названий.
Циклотомические полиномы Ньюмена, масштабирующие сплайны и бинарная функция разбиения Эйлера
Authors: Protasov Vladimir Yur'evich , Wang Yang
Published: November 2018

Класс циклотомических полиномов (целых алгебраических полиномов, все корни которых являются примитивными комплексными корнями из единицы) подробно изучен в литературе. Мы доказываем, что его подкласс, состоящий из $k$-циклотомических полиномомов ($k\geqslant 2$), у которых порядки всех комплексных корней имеют общий делитель $k$, обладает рядом замечательных свойств. Такие полиномы порождают масштабирующие сплайны, они описывают асимптотический рост бинарной функции разбиения Эйлера и т.д. Более того, $k$-циклотомические полиномы эффективно распознаваемы с помощью их $k$-тeплицевых матриц. Особое внимание обращено на $k$-циклотомичекие полиномы Ньюмена, т.е. (0-1) полиномы, из которых мы выделяем одно специальное семейство. Мы показываем, что все $k$-циклотомические полиномы Ньюмена являются делителями полиномов этого семейства и выдвигаем гипотезу, что они на самом деле принадлежат этому семейству. В качестве приложения полученных результатов уточнена асимптотика бинарной функции разбиения Эйлера и найдена ее явная форма в случае регулярного роста.
Библиография: 49 названий.
Регулярные подкатегории в ограниченных производных категориях аффинных схем
Authors: Elagin Alexey Dmitrievich , Lunts Valery Aleksandrovich
Published: November 2018

Предположим, что $R$ - коммутативное нeтерово кольцо и схема $X=\operatorname{Spec} R$ связна. Мы доказываем, что категория $D^b(\operatorname{coh} X)$ не содержит нетривиальных полных триангулированных подкатегорий, обладающих сильным генератором. Также мы ограничиваем снизу размерность Рукье триангулированной категории $\mathscr T$ при условии, что существует триангулированный функтор $\mathscr T \to D^b(\operatorname{coh} X)$, обладающий определенными свойствами. Полученные результаты применяются для изучения когомологического аннулятора кольца $R$ и точечных объектов в категории $\mathscr T$.
Библиография: 15 названий.
Rossinijeve opere na odru Stanovskega gledališča v Ljubljani
Authors: Sivec Jože
Published: November 2018

Rossinijeve opere na odru Stanovskega gledališča v Ljubljani
Giovanni Sebenico
Authors: Velimirović Miloš M.
Published: November 2018

V italijanskih in agleških glasbenozgodovinskih virih iz druge polovice sedemnajstega stoletja srečujemo ime Giovanni Sebenico, ki se omenja kot zelo dober tenorist, kot orglavec, »maestro di capella« in končno kot skladatelj dveh oper. Ker je Sebenico živel določen čas v Benetkah in ker so najstarejši poznani podatki o njem iz tega mesta, so seveda vsi poznejši leksikografi mislili, da gre pač za skladatelja, ki je rojen v Benetkah. Vendar pa, kot se bo še nadalje pokazalo, pojma »Benetke« ni jemati ozko in tako ni treba misliti, da se nanaša na mesto tega imena. Tolmačiti ga je kot izraz, ki vključuje celo področje, in to tako današnje pokrajine tega imena kot ozemlje, ki je v tistem času bilo pod oblastjo Beneške republike.
Uvodna beseda
Authors: Cvetko Dragotin
Published: November 2018

Uvodna beseda
»Vti vishi kakor ta odsgoraj«
Authors: Kumer Zmaga
Published: November 2018

»Vti vishi kakor ta odsgoraj«
»Pesem od toče 1873«
Authors: Kumer Zmaga
Published: November 2018

»Pesem od toče 1873«
Iz korespondence Slavku Ostercu
Authors: Cvetko Dragotin
Published: November 2018

Iz korespondence Slavku Ostercu
Zbirka »Florum Jessaeorum« (Nürnberg 1607) Daniela Lagkhnerja
Authors: Sivec Jože
Published: November 2018

Zbirka »Florum Jessaeorum« (Nürnberg 1607) Daniela Lagkhnerja
Kogojeva suita za orkester »Če se pleše«
Authors: Klemenčič Ivan
Published: November 2018

Kogojeva suita za orkester »Če se pleše«
Klangliche Realisierungen im Werk von Uroš Krek
Authors: Rijavec Andrej
Published: November 2018

Klangliche Realisierungen im Werk von Uroš Krek
Giacomo Carissimis Kompositionen in den Böhmischen Ländern
Authors: Sehnal Jiří
Published: November 2018

Giacomo Carissimis Kompositionen in den Böhmischen Ländern
Zu Beethovens Brief an die unsterbliche Geliebte (Psychologische und medizinische Aspekte)
Authors: Čermák Vlastimil
Published: November 2018

Zu Beethovens Brief an die unsterbliche Geliebte (Psychologische und medizinische Aspekte)
Današnje stanje slovenske muzikologije
Authors: Cvetko Dragotin
Published: November 2018

Današnje stanje slovenske muzikologije
Nekaj značilnosti samospevov Benjamina Ipavca
Authors: Špendal Manica
Published: November 2018

Nekaj značilnosti samospevov Benjamina Ipavca
Amandus Ivančič in njegovo posvetno skladateljsko delo
Authors: Pokorn Danilo
Published: November 2018

Amandus Ivančič in njegovo posvetno skladateljsko delo
Neue Schumanniana
Authors: Boetticher Wolfgang
Published: November 2018

Neue Schumanniana
K vprašanju identitete in otroštva Marija Kogoja
Authors: Klemenčič Ivan
Published: November 2018

K vprašanju identitete in otroštva Marija Kogoja
Razvoj in značilnosti slovenskega romantičnega samospeva
Authors: Špendal Manica
Published: November 2018

Razvoj in značilnosti slovenskega romantičnega samospeva
Orgulje slovenskih graditelja u Hrvatskoj
Authors: Šaban Ladislav
Published: November 2018

Orgulje slovenskih graditelja u Hrvatskoj
Handlungsballet, Melodrama und die musikdramatischen Musikformen des Sturm und Drangs und des Weimarschen Klassizismus
Authors: McCredie Andrew D.
Published: November 2018

Handlungsballet, Melodrama und die musikdramatischen Musikformen des Sturm und Drangs und des Weimarschen Klassizismus
Nekatere značilnosti samospevov Antona Lajovica
Authors: Kartin-Duh Monika
Published: November 2018

Nekatere značilnosti samospevov Antona Lajovica
Scenska glasba Demetrija Žebreta
Authors: Židanik Milena
Published: November 2018

Scenska glasba Demetrija Žebreta
Osmoglasnik v glasbeni tradiciji južnih slovanov
Authors: Petrović Danica
Published: November 2018

Osmoglasnik v glasbeni tradiciji južnih slovanov
Zbirka »Soboles musica« (Nürnberg 1602) Daniela Lagkhnerja
Authors: Sivec Jože
Published: November 2018

Zbirka »Soboles musica« (Nürnberg 1602) Daniela Lagkhnerja
Janáček's Aesthetics
Authors: Jiránek Jaroslav
Published: November 2018

Janáček's Aesthetics
Primer Šturmovega mišljenja baročne oblike
Authors: Bedina Katarina
Published: November 2018

Primer Šturmovega mišljenja baročne oblike
Kamerna muzika u dvadesetom stoljeću – kulturna i kompozicijska kriza jednog žanra
Authors: Bujić Bojan
Published: November 2018

Kamerna muzika u dvadesetom stoljeću – kulturna i kompozicijska kriza jednog žanra
Two Works of the Neue Musik Composed on the Languages of Ancient Cultures
Authors: Doubravová Jarmila
Published: November 2018

Two Works of the Neue Musik Composed on the Languages of Ancient Cultures
Was ist ein Generalbaß-Satz?
Authors: Federhofer Hellmut
Published: November 2018

Was ist ein Generalbaß-Satz?
Über neue handschriftlich überlieferte Lautentabulaturen
Authors: Boetticher Wolfgang
Published: November 2018

Über neue handschriftlich überlieferte Lautentabulaturen
Počeci višeglasja u srpskoj crkvenoj muzici
Authors: Petrović Danica
Published: November 2018

Počeci višeglasja u srpskoj crkvenoj muzici
Samospevi Janka Ravnika
Authors: Špendal Manica
Published: November 2018

Samospevi Janka Ravnika
Ekspresionizem kot glasbeni slog
Authors: Klemenčič Ivan
Published: November 2018

Ekspresionizem kot glasbeni slog
Slojevitost glazbenih ikonografskih izvora u Jugoslaviji
Authors: Kos Koraljka
Published: November 2018

Slojevitost glazbenih ikonografskih izvora u Jugoslaviji
Gustav Mahler in Anton Krisper
Authors: Kuret Primož
Published: November 2018

Gustav Mahler in Anton Krisper
Operski opus Stanojla Rajičića
Authors: Mosusova Nadežda
Published: November 2018

Operski opus Stanojla Rajičića
Intellekt und Phantasie in der Musik von Witold Lutosławski
Authors: Helman Zofia
Published: November 2018

Intellekt und Phantasie in der Musik von Witold Lutosławski
"Čaščen, a nezaželen ..." Ernst Křenek danes – v luči dveh novejših orgelskih skladb
Authors: Bergamo Marija
Published: November 2018

"Čaščen, a nezaželen ..." Ernst Křenek danes – v luči dveh novejših orgelskih skladb
Simfonije Lucijana M. Škerjanca
Authors: Kartin-Duh Monika
Published: November 2018

Simfonije Lucijana M. Škerjanca
Fragmenti srednjeveških koralnih rokopisov v ljubljanski Semeniški knjižnici
Authors: Snoj Jurij
Published: November 2018

Fragmenti srednjeveških koralnih rokopisov v ljubljanski Semeniški knjižnici
»Šmarijski šomašter«
Authors: Kumer Zmaga
Published: November 2018

»Šmarijski šomašter«
Cecchinijeva tretja knjiga madrigalov »Amorosi Concetti«
Authors: Bujić Bojan
Published: November 2018

Cecchinijeva tretja knjiga madrigalov »Amorosi Concetti«
Štajerski deželni trobentač Jakob Globočnik
Authors: Kuret Primož
Published: November 2018

Štajerski deželni trobentač Jakob Globočnik
Donizettijeve opere v Stanovskem gledališču v Ljubljani
Authors: Sivec Jože
Published: November 2018

Donizettijeve opere v Stanovskem gledališču v Ljubljani
Slovenska klavirska glasba
Authors: Lipovšek Marijan
Published: November 2018

Slovenska klavirska glasba