Miracle-dz/UniFAR-FTUs huggingface dataset:
Temperature Rise for Brief Radio-Frequency Exposure Below 6 GHz

In international guidelines for human protection from radio-frequency (RF) electromagnetic fields, the specific absorption rate (SAR) averaged over 6 min and 10 g of tissue is used as a physical quantity to prevent excess local temperature rise. The resultant SAR restriction has been set to avoid potential adverse health effects due to the temperature elevation resulting from RF energy absorption. In the public consultation version of the upcoming ICNIRP RF guidelines (July 10, 2018), a specific absorption (SA) limit was set to avoid heating from brief exposures (shorter than 6 min). However, to the best of our knowledge, no prior research has evaluated the temperature rise for single/multiple pulses with energy equivalent to the 6-min exposure SAR restriction for continuous waves. This paper computed the temperature rise for brief pulse exposures based on bioheat computations. We first confirmed that the peak temperature rise for a pulse with SA corresponding to occupational exposure exceeds the steady-state temperature rise for temporally uniform continuous wave exposure. We then proposed the SA limit from a regression curve that is dependent on the duration of brief exposure to RF pulse(s). The temperature rise in a multilayer cube and an anatomical human model were also computed for exposures to multiple pulses. The temperature rise from multiple pulses satisfying the formula was found to be below the relevant threshold level. The SA based on this regression curve can be used as a metric to prevent excess temperature rise for different brief exposure scenarios below 6 min.
Buyer supplier perspectives on supply chain relationships

Purpose – The paper aims to employ transaction cost theory and social exchange theory to compare how buyers and suppliers perceive relationship mechanisms. The paper also explains the antecedents and dynamics of relationship performance by comparing buyer and supplier perceptions of the same relationships. The paper specifically focuses on the issue of relationship success and test the hypothesis that the antecedents of perceived relationship success for buyers differ from those of suppliers within supply chain relationships.Design/methodology/approach – The paper is based on a study of the supply chain relationships of a major ICT company where matched pairs of buyers and suppliers were surveyed on the nature of their relationships. The survey instrument drew from previously published constructs on key relationship dimensions such as trust, commitment, power, communication, uncertainty and performance. A series of nested measurement models were then developed and tested for the two groups – buyers and su.
Broken discs: Warp propagation in accretion discs

We simulate the viscous evolution of an accretion disc around a spinning black hole. In general, any such disc is misaligned, and warped by the Lense–Thirring effect. Unlike previous studies, we use effective viscosities constrained to be consistent with the internal fluid dynamics of the disc. We find that non-linear fluid effects, which reduce the effective viscosities in warped regions, can promote breaking of the disc into two distinct planes. This occurs when the Shakura & Sunyaev dimensionless viscosity parameter α is ≲0.3 and the initial angle of misalignment between the disc and hole is ≳45°. The break can be a long-lived feature, propagating outwards in the disc on the usual alignment time-scale, after which the disc is fully co-aligned or counter-aligned with the hole. Such a break in the disc may be significant in systems where we know the inclination of the outer accretion disc to the line of sight, such as some X-ray binaries: the inner disc, and so any jets, may be noticeably misaligned with respect to the orbital plane.
Novel Immunotherapeutic Approaches for Neuroblastoma and Malignant Melanoma

Neuroblastoma (NB) and malignant melanoma (MM), tumors of pediatric age and adulthood, respectively, share a common origin, both of them deriving from the neural crest cells. Although NB and MM have a different behavior, in respect to age of onset, primary tissue involvement and metastatic spread, the prognosis for high stage-affected patients is still poor, in spite of aggressive treatment strategies and the huge amount of new discovered biological knowledge. For these reasons researchers are continuously attempting to find out new treatment options, which in a near future could be translated to the clinical practice. In the last two decades, a strong effort has been spent in the field of translational research of immunotherapy which led to satisfactory results. Indeed, several immunotherapeutic clinical trials have been performed and some of them also resulted beneficial. Here, we summarize preclinical studies based on immunotherapeutic approaches applied in models of both NB and MM.
Ecological status of large mammals of a moist semi-deciduous forest of Ghana: implications for wildlife conservation

A preliminary survey was conducted in the Gyeni River and Gyemera Forest Reserves and an off-reserve area within the Moist Semi-Deciduous forest of the Amansie West District of the Ashanti Region, Ghana, to assess the ecological status of large mammals at the area. The study involved transect-walks and interviews with local people. Overall, a total of 23 large mammal species were considered to be potentially present at the study area. Nineteen (83%) of these species belonging to five orders, Pholidota, Carnivora, Hyracoidea, Artiodactyla and Primates were confirmed. The relative abundance of large mammal species (Ar) was low, with high similarity of species composition between study sites (Sorenson Index SI > 0.7) Thirteen of the mammals were of conservation concern; six species, including olive colobus monkey (Procolobus verus), Pel’s anomalure (Anomalurus peli), black duicker (Cephalophus niger), tree-, giant-, and long-tailed pangolins (Phataginus tricuspis, Smutsia gigantea and Manis tetradactyla) are Near Threatened, one species, Geoffroy’s pied colobus monkey (Colobus vellerosus) is Vulnerable and the rest, including bay duicker (Cephalophus dorsalis), Maxwell’s duicker (Cephalophus maxwelli), royal antelope (Neotragus pygmaeus), African civet (Civettictis civetta), African palm-civet (Nandinia binotata) and red river hog (Potamocheorus porcus) are nationally protected. The threats to large mammals included hunting and habitat loss and fragmentation via slash-and-burn agriculture, illegal logging and small scale mining operations. Initiation of biodiversity conservation education, awareness and training programmes for the local people is reccomended for conservation and management of wildlife and their habitats at the study area.
Four-loop critical exponents for the Gross-Neveu-Yukawa models

We study the chiral Ising, the chiral XY and the chiral Heisenberg models at four-loop order with the perturbative renormalization group in $4-\epsilon$ dimensions and compute critical exponents for the Gross-Neveu-Yukawa fixed points to order $\mathcal{O}(\epsilon^4)$. Further, we provide Pad\'e estimates for the correlation length exponent, the boson and fermion anomalous dimension as well as the leading correction to scaling exponent in 2+1 dimensions. We also confirm the emergence of supersymmetric field theories at four loops for the chiral Ising and the chiral XY models with $N=1/4$ and $N=1/2$ fermions, respectively. Furthermore, applications of our results relevant to various quantum transitions in the context of Dirac and Weyl semimetals are discussed, including interaction-induced transitions in graphene and surface states of topological insulators.
Synergistic Effects of Subsistence Hunting and Habitat Fragmentation on Amazonian Forest Vertebrates

Abstract: Subsistence game hunting has profound negative effects on the species diversity, standing biomass, and size structure of vertebrate assemblages in Amazonian forests that otherwise remain largely undisturbed. These effects are likely to be considerably aggravated by forest fragmentation because fragments are more accessible to hunters, allow no (or very low rates of ) recolonization from nonharvested source populations, and may provide a lower‐quality resource base for the frugivore‐granivore vertebrate fauna. I examined the likelihood of midsized to large‐bodied bird and mammal populations persisting in Amazonian forest fragments of variable sizes whenever they continue to be harvested by subsistence hunters in the aftermath of isolation. I used data from a comprehensive compilation of game‐harvest studies throughout Neotropical forests to estimate the degree to which different species and populations have been overharvested and then calculated the range of minimum forest areas required to maintain a sustainable harvest. The size distribution of 5564 Amazonian forest fragments—estimated from Landsat images of six regions of southern and eastern Brazilian Amazonia—clearly shows that these are predominantly small and rarely exceed 10 ha, suggesting that persistent overhunting is likely to drive most midsized to large vertebrate populations to local extinction in fragmented forest landscapes. Although experimental studies on this negative synergism remain largely unavailable, the prospect that increasingly fragmented Neotropical forest regions can retain their full assemblages of avian and mammalian species is unlikely.
Repellency of Two Essential Oils to Monomorium pharaonis (Hymenoptera: Formicidae)

Abstract The pharaoh ant (Monomorium pharaonis [L.]; Hymenoptera: Formicidae) is one of the most important pests in populated areas around the world where food and water are abundant. In this study, the repellency of the essential oils from Curcuma longa L. (Zingiberaceae) (turmeric) and Litsea cubeba (Lour.) Pers. (Lauraceae) (litsea) to the pharaoh ant was evaluated. For the tests, the area choice method was used, and 0.1 mL of essential oil at 1 of 3 concentrations (10,000 ppm, 1,000 ppm, and 100 ppm) was applied on a half disc of filter paper to obtain a final concentration of 31.4 µg/cm2, 3.1 µg/cm2, and 0.3 µg/cm2. The same volume of mixture but without essential oil (distilled water + dimethyl sulfoxide + Tween-20®) was used as a control. The repellency of the oils was tested with and without availability of food to the ants, with the food consisting of small maize kernels. Both oils repelled ants with and without the availability of food at a concentration of 10,000 ppm. Turmeric oil showed a higher repellency than litsea oil in both the absence and presence of food. Furthermore, with food present, the repellency of turmeric oil increased whereas that of litsea oil decreased. The minimum percentages of repellency recorded for turmeric and litsea oils were >80% and >70%, respectively. This study demonstrated that the oils from these plants have a strong repellent effect on pharaoh ants in laboratory tests. Further studies are needed to determine the concentrations of these oils that can be used effectively for ant control in buildings and in open fields.
N ov 2 01 8 Hypergraph polynomials and the Bernardi process

Recently O. Bernardi gave a formula for the Tutte polynomial T (x, y) of a graph, based on spanning trees and activities just like the original definition, but using a fixed ribbon structure to order the set of edges in a different way for each tree. The interior polynomial I is a generalization of T (x, 1) to hypergraphs. We supply a Bernardi-type description of I using a ribbon structure on the underlying bipartite graph G. Our formula works because it is determined by the Ehrhart polynomial of the root polytope of G in the same way as I is. To prove this we interpret the Bernardi process as a way of dissecting the root polytope into simplices, along with a shelling order. We also show that our generalized Bernardi process gives a common extension of bijections (and their inverses) constructed by Baker and Wang between spanning trees and break divisors.
The mediating role of person-organization fit in the supportive leadership-outcome relationships

This study examines whether person-organization fit (P-O fit) would mediate the relationships of supportive leadership with the outcome variables of turnover intentions and job satisfaction. We collected data from a survey of 310 telecommunication employees in Turkey. Our results show that P-O fit fully mediates the relationship between supportive leadership and turnover intentions, while P-O fit partially mediates the relationship between supportive leadership and job satisfaction. Therefore, person-organization fit is an intermediary mechanism that explains the supportive leadership-outcome relationships. In other words, supportive leadership behavior influences job satisfaction and turnover intentions through the person-organization fit. Specifically, higher levels of supportive leadership behavior predicts greater P-O fit, which in turn is a significant predictor of higher levels of job satisfaction and lower levels of turnover intentions. We evaluated both Baron & Kenny’s approach and Sobel test together in order to achieve more powerful strategy when testing mediation (P-O fit). Both approaches provide evidence for the mediation effect of personorganization fit in this study. Age, gender, and tenure were controlled in order to eliminate spurious relationships. Further, we also examined a series of confirmatory factor analyses, which includes our hypothesized four factor model and three alternative models in order to provide additional evidence for the discriminant validity. Results reveal that hypothesized four factor model fit the data better than any of the three alternative models. The findings of the study suggest important implications for management theory and practice. For instance, when managers provide support and create friendly and psychologically supportive work environments, this promotes employees’ perceived value congruence with their organization and employees probably perceive that they will fit better to such organization, which in turn results with increased level of job satisfaction and decreased level of turnover intentions.
The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey

Context. Active galactic nuclei (AGN) emit radiation over a wide range of wavelengths, with a peak of emission in the far-UV region of the electromagnetic spectrum, a spectral region that is h istorically difficult to observe. Aims. Using optical, GALEX UV, and XMM-Newton data we derive the spectral energy distribution (SED) from the optical/UV to X-ray regime of a sizeable sample of AGN. The principal motivation is to investigate the relationship between the optica l/UV emission and the X-ray emission and provide bolometric corrections to the hard X-ray (2-10 keV) energy range, kbol, the latter being a fundamental parameter in current physical cosmology. Methods. We construct and study the X-ray to optical SED of a sample of 195 X-ray selected Type 1 AGN belonging to the XMMNewton bright serendipitous survey (XBS). The optical-UV luminosity was computed using data from the Sloan Digital Sky Survey (SDSS), from our own dedicated optical spectroscopy and the satellite Galaxy Evolution Explorer(GALEX), while the X-ray luminosity was computed using XMM-Newton data. Because it covers a wide range of redshift (0.03 < z . 2.2), X-ray luminosities (41.8< logL[2−10]keV< 45.5 erg/s) and because it is composed of “bright objects”, this sample is ideal for this kind of investigation. Results. We confirm a highly significant correlation between the accre tion disc luminosity Ldisc and the hard X-ray luminosity L[2−10]keV, in the form Ldisc ∝ L β [2−10]keV, whereβ = 1.18± 0.05. We find a very shallow dependence of kbol on the X-ray luminosity with respect to the broad distribution of values of kbol. We find a correlation between kbol and the hard X-ray photon index 2−10keV and a tight correlation between the optical-to-X-ray spect ral indexαox and kbol, so we conclude that both 2−10keV andαox can be used as a proxy for kbol.
Assessing Frontline Staff Performance of Service Delivery in Some Selected Hotels in Accra Metropolis

The need of the Customer satisfaction means that how the customer perceives service delivery. Customer satisfaction will be a function of service that performance relative to the customer expectation. For this reason, it is important to understand how customer expectation is formed in order to identify the factors of service satisfaction in the hotel industry. There are views from different customers with different expectations, on their knowledge base of a product or service. This can be implied that a customer may estimate what the service performance will be or may think what the performance ought to be. If the service performance meets or exceeds customers’ expectation, the customers will be satisfied. The objective of the study were to assess the performance of frontline staff in the hotel industry. With a sample size of seventy five (75) picked at random from five (5) selected hotels with their grading ranging from two-star and three-star and the people interviewed being management staff, frontline staff and guest. The study used questionnaires for data collection and the Statistical Package for Social Sciences (SPSS) for analysis of the data. The findings indicate that “Quality services” is the highest ranking among other service dimensions which the hotel customers expect. This signifies that the hotel customers are concerned with a standard of service that should be provided equivalently within the industry. Regarding the service expectation dimensions, inferential analyses show that there are significant differences among hotel customers, who have different patterns of visit, age ranges, and levels of income. The managerial implications are drawn from this study for two and three hotels, and policy-makers.
Soil reaction and absorption of silicon by rice

A solubilidade e disponibilidade de silicio podem ser influenciadas pela reacao do solo. Com o objetivo de estudar o efeito da reacao do solo sobre a disponibilidade de silicio para a cultura do arroz, foi conduzido experimento em Latossolo Vermelho alico textura argilosa em casa-de-vegetacao. O experimento foi conduzido em fatorial 4 x 4, delineamento em blocos inteiramente casualizados e quatro repeticoes. Quatro materiais (calcario, silicato de calcio e magnesio, acido silicico purissimo e wollastonita) foram aplicados em doses equivalentes a 0, 2500, 5000, 7500 mg por vaso de 5 kg. Apos 60 dias, foram avaliadas producao de materia seca, absorcao de silicio da parte aerea do arroz, pHCaCl2, silicio extraido em acido acetico (0,5 mol L-1) e CaCl2 (0,01 mol L-1) no solo. Os materiais aumentaram o pH do solo com as doses, exceto o acido silicico. O silicio soluvel em acido acetico foi crescente com as doses dos materiais. Para o CaCl2, apenas houve aumento de silicio soluvel no solo com as doses de wollastonita e silicato de calcio e magnesio, concordando com seu teor total. A absorcao de silicio pela parte aerea do arroz foi linearmente crescente com as doses da wollastonita, seguida do silicato de calcio e magnesio, acido silicico e calcario. O aumento do pH do solo com calcario nao foi suficiente para fornecer silicio ao arroz. O silicio extraido com CaCl2 0,01 mol L-1 apresentou maior correlacao com a absorcao de silicio pelas plantas. Mais estudos sao necessarios em condicoes de campo e outros solos para corroborar os resultados apresentados.
A Case Study of Laser Wind Sensor Performance Validation by Comparison to an Existing Gage

A case study concerning validation of wind speed measurements made by a laser wind sensor mounted on a 190 square foot floating platform in Muskegon Lake through comparison with measurements made by pre-existing cup anemometers mounted on a met tower on the shore line is presented. The comparison strategy is to examine the difference in measurements over time using the paired-t statistical method to identify intervals when the measurements were equivalent and to provide explanatory information for the intervals when the measurements were not equivalent. The data was partitioned into three sets: not windy (average wind speed measured by the cup anemometers ≤ 6.7m/s) windy but no enhanced turbulence (average wind speed measured by the cup anemometers > 6.7m/s), and windy with enhanced turbulence associated with storm periods. For the not windy data set, the difference in the average wind speeds was equal in absolute value to the precision of the gages and not statistically significant. Similar results were obtained for the windy with no enhanced turbulence data set and the average difference was not statistically significant (a=0.01). The windy with enhanced turbulence data set showed significant differences between the buoy mounted laser wind sensor and the on-shore mast mounted cup anemometers. The sign of the average difference depended on the direction of the winds. Overall, validation evidence is obtained in the absence of enhanced turbulence. In addition, differences in wind speed during enhanced turbulence were isolated in time, studied and explained.
RR Lyrae stars: Kinematics, orbits and z-distribution

RR Lyrae stars in the Milky Way are good tracers to study the kinematic behaviour and spatial distribution of older stella r populations. A recently established well documented sample of 217 RR Lyr stars with V 0.4, and normalized maximum orbital z-distance> 0.45. Of these stars roughly half have retrograde orbits. The z-distance probability distribution of this sample shows scale heights of 1.3± 0.1 kpc for the disk component and 4.6± 0.3 kpc for the halo component. With our orbit statistics method we found a (vertical) spatial distribution which, out to z = 20 kpc, is similar to that found with other methods. This distribution is also compatible with the ones found for blue (HBA and sdB) halo stars. The circular velocity �, the orbit eccentricity, orbit z-extent and [Fe/H] are employed to look for possible correlations. If any, it is tha t the metal poor stars with [Fe/H]< 1.0 have a wide symmetric distribution about � = 0, thus for this subsample on average a motion independent of disk rotation. We conclude that the Milky Way possesses a halo component of old and metal poor stars with a scale height of 4‐5 kpc having random orbits. The presence in our sample of a few metal poor stars (thus part of the halo population) with thin disk-like orbits is st atistically not surprising. The midplane density ratio of h alo to disk stars is found to be 0.16, a value very dependent on proper sample statistics.
EXPERIMENTAL STUDY ON GUIDED BONE REGENERATION IN CANINE SEGMENTAL ULNAR DEFECTS

Summary Paskalev, M. , S. Krastev, Sv. Mechkarski, J. Philipov & Sv. Dyakova, 2006. Experimental study on guided bone regeneration in canine segmental ulnar defects. Bulg. J. Vet. Med. , 9, No 4, 281 ￻291. The present study aimed to determine the possibility of application of guided bone regeneration in experimental non-fixed ulnar defects in dogs. In 24 dogs, a total of 48 ulnar bone defects were created (24 left and 24 right). The dogs were allotted to 4 groups (6 animals each). The right defects were treated as followed: group I ￻ the bone defects were filled with autocancellous bone; in group II - with allocancellous bone; in group III ￻ with xenocancellous bone and in group IV ￻ with xenocan- cellous bone and bioceramics. The defects of left ulnas were treated similarly and isolated from adja- cent soft tissues with enzymatically processed and freeze-dried canine dura mater. Both ends of the ulna were not fixed by osteosynthesis. In the post operative period, radiological and clinical surveys were performed immediately after the surgery and 1, 2, 4 and 6 months after treatments. The guided bone regeneration using processed dura mater slowed down the osteogenesis in segmental non-fixed canine ulnar defects regardless of the type of used osteoinductor graft.