Miracle-dz/UniFAR-FTUs huggingface dataset:
Performance evaluation with receiver collisions analysis in very high-speed optical fiber local area networks using passive star topology

The problem of receiver collisions in high-speed optical fiber local area networks is studied in this paper. The configuration of high-speed multichannel LAN's with wavelength division multiplexing techniques using an optical fiber bandwidth gives rise to receiver collisions phenomena. We give a detailed analysis and develop rigorous methods to examine the effect of receiver collisions in this type of multiaccess environment. The evaluations are carried out assuming Poisson arrivals and finite population and examine the throughput performance and the rejection probability at destination. Also numerical results are showing the throughput performance behavior as it compared with the protocol case without receiver collisions.
The synergy of causation and effectuation in the process of entrepreneurial networking: Implications for opportunity development

The resource-based view of entrepreneurial networking demonstrates how relationships are formed instrumentally through the goal-driven decision-making of causation. At the same time, evidence shows that under conditions of uncertainty, entrepreneur networking follows the non-predictive decision-making of effectuation. However, little is known about how entrepreneurs combine these two logics, that is, causation and effectuation, for opportunity development. This study identifies four hybrid combinations of causal and effectual networking behaviour. The outcome of this hybrid networking is a synergistic effect on opportunity development. This article contributes to the entrepreneurial effectuation research, analyses of entrepreneurial networking and the literature on entrepreneurial opportunity.
Numerical Investigation to Asses and Optimize Performance of Flat Plate Solar Collector by Using Different Working Fluid

Sustainable energy becomes an optimal alternative to overcome environmental pollution economical cost of fossil fuel. One of the most effective means to invest solar radiation is flat plate solar collectors. A study carried out to optimize and assess the performance of flat plate solar collector (FPSC) for domestic and industrial applications in the Iraq climate. A 3D numerical model of FPSC has modeled by ANSYS19, CFD tool has been used to investigate thermal transfer through FPSC based on different working fluid. Water, and nanofluid of water/copper nanomaterials were used as working fluid with three different concentrations levels, 0.011 %, 0.055%, and 0,101 %. The velocity of water was 0.3, and 0.5 m/sec respectively. The result of the numerical model was compared with a literature study to prove the reliability of the current model. The result of the current study indicated that, adding Cu nanoparticular to the working fluid enhanced temperatures outlet of FPSC. Also, maximum temperatures can be achieved by reducing the velocity value.
Multistatic localization error due to receiver positioning errors

This paper is a summary of a study of the effect of receiver position errors on the target localization accuracy of a multistatic sonar. The multistatic active system under examination consists of one or more transmitters and receivers, and the target is localized in the horizontal plane by means of echoes from the transmissions. Two-dimensional propagation of sound, with a constant sound speed, is assumed throughout. A simple analytic approach, implemented and illustrated numerically, is derived for calculating the sensitivity to receiver position error over a specified area. For many of the examples considered, there are considerable regions where target localization errors can be unacceptably large even for highly accurate receiver positions.
Experimental and Numerical Study on Pounding Effects and Mitigation Techniques for Adjacent Structures

Pounding of adjacent buildings has been a major cause of building damages in the past earthquakes. In this study, two series of shaking table experiments on small scale moment resisting one-bay frames subjected to harmonic excitation and seismic time histories are described. A series of tests on techniques of reduction the effects of pounding are also presented. They are increase in distance of the buildings, application of impact absorbing material and connecting the two buildings together. The results of experiments and analyses indicate both the effectiveness and problems associated with each method of reducing pounding effects. It was found that the impacts absorbing materials were found to be very effective in reducing pounding effect and the responses of frames were very sensitive to the gap between them.
Post-occupancy evaluation: benefits and barriers

Post-occupancy evaluation (POE) is examined within a North American perspective. Benefits from using POE are examined and include: a feedback loop to enhance continuous improvement processes, improved fit between occupants and their buildings, the optimization of services to suit occupants, the reduction of waste of space and energy, validation of occupants' real needs, reduced ownership/ operational expenses, improved competitive advantage in the marketplace. The barriers to implementing POE are found to include: fragmented incentives and benefits within the procurement and operation processes, lack of agreed and reliable indicators, potential liability for owners, exclusion from current delivery expectations, exclusion from professional curricula. Recommendations for overcoming these barriers are made at governmental, institutional, corporate and project levels. L'évaluation de la fonctionnalité après emménagement est examinée d'un point de vue nord-américain. Les auteurs considèrent les avantages de la POE: une boucle de retour de l'information pour accroître les procédures d'amélioration continue, une meilleure cohérence entre les occupants et leurs bâtiments, l'optimisation des services pour répondre aux besoins des occupants, la réduction des gaspillages d'espace et d'énergie, la validation des besoins réels des occupants, la réduction des dépenses pour les propriétaires et pour les exploitants, une amélioration de la compétitivité sur le marché. Les obstacles à la mise en oeuvre de procédures de POE sont les suivants: fragmentation des stimulations et des avantages dans le cadre des procédures d'approvisionnement et d'exploitation, manque d'indicateurs fiables et adoptés par tous, responsabilité potentielle des propriétaires, exclusion des attentes actuelles en matière de livraison, exclusion des programmes d'études professionnelles. Les auteurs font ensuite des recommandations pour surmonter ces obstacles aux niveaux gouvernemental, institutionnel, des entreprises et des projets.
Small signal analysis for dispersive optical fiber communication systems

A small signal analysis for analyzing the conversion between intensity and phase modulation or noise in a dispersive fiber is given. Using this theory the small signal response of laser diodes with respect to intensity and phase modulation in dispersive optical fibers is derived. Guidelines are also given for considerably reducing the intensity noise if a fiber with a suitable dispersion is used. All analytical calculations are compared with numerical simulations and good agreement is achieved. >
Mechanical pulping

Two independent models for describing critical limitations in the operation of wood-chip disc refiners are presented and compared. One model has been derived using force distributions of the axial thrust and the steam pressure inside the refining zone. The other model is based on an extended entropy model, where physical variables like dynamic viscosity and fiber concentration along the radius in the refiner are central. The results suggest that both models are suitable for implementation in process computers for on-line limit protection. Both models predict non-linear dynamic process behavior in operating regions with impending risk of plate clash.
Incident-Induced Diversion Behavior: Existence, Magnitude, and Contributing Factors

AbstractThe need to understand the effects of diverting traffic is emphasized by growing congestion and delays. This paper examines incident-induced diversion behavior by using loop-detector data and incident records on a freeway in Virginia. This work diverges from previous studies by (1) addressing both existence of diversion and its magnitude, (2) relying on field data rather than surveys, and (3) statistically relating diversion behavior and magnitude to quantifiable incident characteristics and traffic conditions. A dynamic programming-based procedure is used to identify diversions by isolating transient level shifts, and the diversions are associated with incident and traffic characteristics and variable message sign (VMS) displays through a binary logit model. The magnitude of the diversion is statistically related to traffic conditions via a linear regression model. The models indicate that the probability of triggering a diversion increases when an incident lasts longer, more general-purpose lane.
Examining Linear and Nonlinear Associations Between Negative Emotional Reactivity to Daily Events and Depression Among Adolescents

Existing research supports competing hypotheses about the link between negative emotional (NE) reactivity to daily events (e.g., hassles and uplifts) and depression. Some have suggested that depression is associated with blunted reactivity, and others have suggested that depression is associated with heightened reactivity. In this study, we tested linear and nonlinear associations, cross-sectionally and longitudinally, between NE reactivity and depression among a sample of 232 adolescents. Participants completed lab-based assessments of depression then rated their experience of emotions, daily hassles, and uplifts three times per day for 7 days. Interviews were readministered 1.5 years later. Results show a significant U-shaped relationship between NE reactivity to hassles and depression symptoms cross-sectionally, which suggests that depression is more severe at the extremes of NE reactivity. NE reactivity to daily uplifts showed significant linear associations, but not quadratic associations, with depression such that heightened reactivity to uplifts was associated with more severe depression symptoms concurrently and predicted worsening of depression longitudinally.
Cylindrical re-entrant cavity resonator design using finite-element simulation

The results of research carried out by Hansen in the early 1940s on “ideal” re-entrant cavity geometries has generated data which permit, through graphical methods, the prediction of the performance and characteristics of such resonators. These data are still relied upon today in the design of re-entrant cavities for use in, for example, microwave tubes and microwave filters. In an attempt to improve the design process for re-entrant cavities which are more representative of “real” cavity configurations, a series of EM simulations have been performed to provide more precise characteristics for design purposes. Simulations of a range of cylindrical re-entrant resonant cavities have been carried out, and corrections to the Hansen data are suggested. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 112–117, 1998.
QUALIDADE MICROBIOLÓGICA DE ÁGUAS DE COCO COMERCIALIZADAS NO MUNICÍPIO DE CURRAIS NOVOS/RN

A agua de coco e uma bebida obtida do fruto verde de coqueiro, sendo um liquido refrescante, isotonico e cada vez mais consumido por suas caracteristicas organolepticas e nutricionais. As etapas de extracao e engarrafamento sao bastante susceptiveis ao ataque microbiano resultando em perda da qualidade do produto e consequente diminuicao do seu valor comercial. O presente trabalho teve como objetivo verificar a qualidade microbiologica da agua de coco engarrafada e comercializada na cidade de Currais Novos/RN. Observou-se que, das 22 amostras analisadas, a presenca de coliformes totais foi verificada em 82% das amostras (dezoito amostras) sugerindo o contato do coco com o habitat da referida bacteria bem como falhas no processo de higienizacao do fruto. Com relacao a contagem de coliformes fecais, 22,7% apresentava-se fora dos padroes estabelecidos pela Legislacao Brasileira, no entanto nao foi constatada a presenca de Salmonella sp e Staphylococcus coagulase positiva. Bacterias mesofilas e bolores e leveduras foram encontrados em niveis de 6,0 x 10 UFC/mL a 3,0 x 105 UFC/mL e de zero a 1,7 x 105 respectivamente, sugerindo a necessidade de melhorias durante o processo de envase de agua de coco verde resfriada.
Computer Vision Syndrome Prevalence and Ocular Sequelae among Medical Students: A University-Wide Study on a Marginalized Visual Security Issue

This study aimed to discover and document the potential of visual and ocular sequelae of computer vision syndrome (CVS) among medical students. This cross-sectional case-control study was conducted on medical students (n=4030) of five universities in Egypt. All students completed a specially designed and validated CVS questionnaire survey (CVS-F3). Students with ≥5 CVS symptoms constituted a risk group (n=352), while students with 1-4 CVS symptoms constituted a low-symptoms group (n=3067). Students from the control and risk groups were examined using objective methods, such as visual acuity, subjective refraction, dry eye disease tests, and anterior segment and fundus examinations. Students who complained of visual blur underwent multifocal electroretinography mfERG examinations (mfERG group). The CVS-F3 indicated that 84.8% of students had complaints that might be related to CVS, however, our ophthalmic examination group revealed only a 56% CVS prevalence rate. The most common single screen type used by 70.4% of students was the smartphone, and the most common complaint was headache (50.2%). Multivariate logistic regression analysis revealed that CVS was significantly associated with increased screen-hours, including >2 screen-hours daily (odds ratio [OR], 2.48; P<0.0001), >2 screen-hours at night (OR, 1.79; P=0.003), and ≥3 screen-years (OR, 1.69; P=0.006). In the mfERG group, 37% demonstrated reduced amplitudes of mfERG rings and quadrants, indicating reduced foveal responses. CVS-questionnaires overestimate the true CVS prevalence and sequelae, which could be accurately detected by objective ophthalmic examination. Smartphones primarily caused CVS among students, with CVS severity increasing in correlation with shorter eye-to-screen distance and frequent use. Contact lens wearing doubled the risk of CVS development and augmented its severity. CVS might affect macular integrity with screen-induced foveal dysfunction. PACTR201811618954630.
Adenoid Ameloblastoma with Dentinoid

This article aimed to collectively present the demographic, clinical, radiographic and histopathological features as well as the treatment performed along with its outcome for all the cases of adenoid ameloblastoma with dentinoid (AAD) reported in scientific literature till date. Ameloblastoma and adenomatoid odontogenic tumours are the most common odontogenic neoplasms. However, AAD, a hybrid variant of the two lesions, is found to be extremely rare. The lesion comprises of characteristic histopathological features of ameloblastoma and adenomatoid odontogenic tumour and shares certain clinical characteristics with either of the entities. AAD may be considered to be present at the more aggressive end of spectrum of benign odontogenic neoplasms. Owing to the frequent tendency of the lesions to be underdiagnosed, careful histopathological screening of submitted biopsies is warranted. With the increase in number of reported cases in the recent years, it is likely to be included as a separate entity in the upcoming World Health Organization classification.
Effect of non‐moment braced frame seismic deformations on buckling‐restrained brace end connection behavior: Theoretical analysis and subassemblage tests

In‐plane buckling‐restrained brace (BRB) end rotation induced by frame action is a commonly observed phenomenon in buckling‐restrained braced frames (BRBFs). However, its effect on BRB end connection behavior has not yet been clear. In this study, four BRB end deformation modes for quick determination of end rotational demand are proposed for non‐moment BRBF considering different BRB arrangements, installing story of BRBs, and boundary condition of corner gussets connected with column base. Key factors affecting BRB end rotation and flexural moments are examined theoretically by parametric analysis. Subassemblage tests of seven BRB specimens under horizontal cyclic loading were conducted by adopting two loading frames to impose the expected BRB end deformations. It shows that BRB end rotation subjected BRB ends to significant flexural moments, leading to premature yielding of BRB ends or even tendency of end zone buckling. The deformation modes, the flexural rigidity of BRB ends, and the initial geometric imperfections of BRBs were found to have significant influence on BRB end connection behavior. The triggering moment induced by BRB end rotation was the main contributor to end flexural moment. However, the moment amplification effect induced by flexure of BRB end zones became prominent especially for small flexural rigidity of BRB ends. Implications and future research needs for design of BRB end connections are provided finally based on the theoretical and experimental results. Copyright © 2015 John Wiley & Sons, Ltd.
Principal Factors Influencing Tree Growth in Low-Lying Mid Atlantic Coastal Forests

Flood frequencies in coastal forests are increasing as sea level rise accelerates from 3–4 mm year−1 to possibly more than 10 mm year−1 by the end of this century. As flooding increases, coastal forests retreat, ghost forests form, and coastal marshes migrate inland. The existence of ghost forests makes the mechanism of forest retreat clear: low-lying trees become more exposed to coastal flooding until they ultimately die. Variability in these retreat rates, however, makes it difficult to predict where and when retreat will continue to occur. Understanding tree growth responses to tidal water levels relative to other environmental factors is a critical step in elucidating the factors that influence retreat variability. Here, dendrochronology was used to study factors that contribute to variations in growth patterns in four coastal forests fringing the Delaware and Barnegat Bays. Species chosen for study included loblolly pine (Pinus taeda), pitch pine (Pinus rigida), and American holly (Ilex opaca). Pearson’s and partial correlation tests showed that growth relationships with monthly environmental conditions varied across sites and were moderate in strength (generally R < 0.5), but each site had at least one significant growth-water level correlation. As coastal flooding exposure is spatially dependent, tree chronologies were also separated into high and low elevation groups. Pearson’s and partial correlation tests of the mean differences between elevation groups showed that at some sites, low elevation trees grew less than high elevation trees when water levels were high, as might be expected. At one site, however, lower elevation trees grew more when water levels were higher, which suggests that other interacting factors—regardless of current flood exposure—potentially have positive, yet likely temporary, influence over tree growth in these low-lying areas.
Charging of one or several cylindrical particles by monopolar ions in electric fields

In many electrostatic processes (precipitation of dust, separation of granular mixtures, spraying of powders) insulating particles are subjected to unipolar charging in the presence of other bodies. The present paper addresses this problem from both a computational and an experimental point of view, with the aim to extend an original numerical method of unipolar charge computation to the case of two or more particles, relatively close to each other. The charge acquired by cylinders of various dielectric constants was evaluated with a computer program based on the boundary element method of field analysis. The experimental setup simulated the charging conditions of millimeter-size calibrated cylinders of polyvinyl chloride in a roll-type electrostatic separator, the unipolar space charge being generated by a wire-type electrode. The experimental results, which were in good agreement with the theoretical predictions, put forward that the relative spacing between the particles changes the value of the saturation charge, an effect, which is stronger for particles of higher dielectric constant. These facts should be taken into account in the design of any electrostatic technology based on the corona charging of granular matter.
Low NOx Combustor for Automotive Ceramic Gas Turbine—Reliability Assurance

Two aspects of reliability assurance are discussed. First, This paper deals with the reliability design of the emissions under transient conditions. The optimization was made from the simulation results of the relationship between the response of the variable combustor geometry to follow load changes and the resulting exhaust emission levels. The load variation pattern used in this investigation was that of the Japanese 10mode regulation. Second, this paper describes the validity of the reliability design prepared for the ceramic liner of the combustor. A service life prediction was made for the liner on the basis of stress analysis results and fatigue parameters.
Asymmetric Impacts of the South Korean Currency on Korea’s Commodity Trade Balance with Japan

ABSTRACT This study examines the asymmetric and symmetric impacts of appreciation and depreciation in the Korean won on Korea’s commodity trade balance with Japan. To this aim, the linear and nonlinear autoregressive distributed lag (NARDL) models are applied. However, this study methodologically differs from previous empirical studies in the related literature applying the NARDL model. These previous studies are constructed based on only short-run and long-run symmetry (denoted by SS) and short-run and long-run asymmetry (denoted by AA). This study, however, also considers two other alternative cases as short-run asymmetry-long-run symmetry (denoted by AS) and short-run symmetry-long-run asymmetry (denoted by SA).
Three-dimensional electromagnetic analysis of shielded microstrip circuits

The spectral domain integral equation approach is employed for the characterization of passive microstrip circuits that cannot be analyzed using the traditional lumped-circuit-based approach. General planar and certain three-dimensional structures such as vias and air bridges are analyzed using the presented technique. Spurious mode coupling and the effect of the microwave housing on circuit performance are also investigated. © 1992 John Wiley & Sons, Inc.