1,847 research outputs found
Validity and Failure of the Boltzmann Weight
The dynamics and thermostatistics of a classical inertial XY model,
characterized by long-range interactions, are investigated on -dimensional
lattices ( and 3), through molecular dynamics. The interactions between
rotators decay with the distance like~ (), where and respectively correspond to the
nearest-neighbor and infinite-range interactions. We verify that the momenta
probability distributions are Maxwellians in the short-range regime, whereas
-Gaussians emerge in the long-range regime. Moreover, in this latter regime,
the individual energy probability distributions are characterized by long
tails, corresponding to -exponential functions. The present investigation
strongly indicates that, in the long-range regime, central properties fall out
of the scope of Boltzmann-Gibbs statistical mechanics, depending on and
through the ratio .Comment: 10 pages, 6 figures. To appear in EP
Day-to-day Variability of Stuttering
Variability has long been known to be a primary feature of the disorder of stuttering (Bloodstein & Bernstein Ratner, 2008; Costello & Ingham, 1984; Yaruss, 1997a, 1997b). Many factors that affect variability have been investigated (Brown, 1937; Johnson & Brown, 1935; Quarrington, Conway, & Siegel, 1962) yet the typical range of variability experienced by speakers remains unknown. This study will examine the speech of six adult speakers in three spontaneous speaking situations and two reading tasks. The frequency, duration, and types of stuttered events that occur on the tasks will be compared within and between speakers. The focus will be on describing variability in stuttering frequency and duration within speakers and attempting to detect consistent patterns between speakers
Highly Conductive And Transparent Amorphous Tin Oxide
The physical properties of chemically sprayed tin oxide films have been investigated. The optical and transport behavior of both amorphous and polycrystalline material depends on the reaction temperature. Amorphous films deposited at very low temperatures (Ts=220°C) possess a conductivity as high as that of the polycrystalline layers. Hall effect measurements and compositional analyses of those amorphous films show that nonintentional chlorine doping is responsible for the increased conductivity. Optical transmission in the visible region of the spectrum is almost as good in amorphous as in polycrystalline material. An antireflecting coating of amorphous tin oxide with an optical gain of 40% has been achieved on silicon wafers. Furthermore, film thickness homogeneity broadens the field of application to various optoelectronic devices.54143143
Extent and barriers of Collaboration among Administrators in Teachersâ Professional Development Program
The study aims to determine the extent of collaboration among school administrators in the Teachersâ Professional Development Program in terms of sense of belonging; networks, feelings of trust and safety; reciprocity; participation; citizen power/proactivity; values;, norms, outlook in life; and diversity. It also aims to determine any significant difference between the extent of collaboration of the school administrators when grouped according to their profile and to determine the barriers to collaboration in the Teachersâ Professional Development Program. The study utilized descriptive qualitative design and quota sampling wherein 60 administrators from 3 schools of district 5 of Quezon City participated. For public secondary schools In-Service Training got the highest percentage (100%) in terms of Teachersâ Professional Development Program. For the factors on the extent of collaboration among school administrators, only citizen power/proactivity got a weighted mean of 2.96 which is below 3.50 and interpreted as âHigh Extentâ while all other factors got a weighted mean higher than 3.50 and interpreted as âVery High Extentâ. There was also no significant difference between the extent of collaboration of school administrators when they are grouped according to their length of service (p-value=0.248); educational attainment (p-value=0.088); and position/rank (p-value=0.265). Meanwhile, the first three in rank in barriers to collaboration in the Teachersâ Professional Development Program are dissemination of information and proper coordination, resources/finances and time management, and lastly, commitment and decision making
Effect of energy density and virginiamycin supplementation in diets on growth performance and digestive function of finishing steers.
ObjectiveThis study was determined the influence of virginiamycin supplementation on growth-performance and characteristics of digestion of cattle with decreasing dietary net energy value of the diet for maintenance (NEm) from 2.22 to 2.10 Mcal/kg.MethodsEighty crossbred beef steers (298.2±6.3 kg) were used in a 152-d performance evaluation consisting of a 28-d adaptation period followed by a 124-d growing-finishing period. During the 124-d period steers were fed either a lesser energy dense (LED, 2.10 Mcal/kg NEm) or higher energy dense (HED, 2.22 Mcal/kg NEm) diet. Diets were fed with or without 28 mg/kg (dry matter [DM] basis) virginiamycin in a 2Ă2 factorial arrangement. Four Holstein steers (170.4±5.6 kg) with cannulas in the rumen (3.8 cm internal diameter) and proximal duodenum were used in 4Ă4 Latin square experiment to study treatment effects on characteristics of digestion.ResultsNeither diet energy density nor virginiamycin affected average daily gain (p>0.10). As expected, dry matter intake and gain efficiency were greater (p<0.01) for LED- than for HED-fed steers. Virginiamycin did not affect estimated net energy value of the LED diet. Virginiamycin increased estimated NE of the HED diet. During daylight hours when the temperature humidity index averaged 81.3±2.7, virginiamycin decreased (p<0.05) ruminal temperature. Virginiamycin did not influence (p>0.10) ruminal or total tract digestion. Ruminal (p = 0.02) and total tract digestion (p<0.01) of organic matter, and digestible energy (p<0.01) were greater for HED vs LED. Ruminal microbial efficiency was lower (p<0.01) for HED vs LED diets.ConclusionThe positive effect of virginiamycin on growth performance of cattle is due to increased efficiency of energy utilization, as effects of virginiamycin on characteristics of digestion were not appreciable. Under conditions of high ambient temperature virginiamycin may reduce body temperature
Lithium depletion in solar-like stars: effect of overshooting based on realistic multi-dimensional simulations
We study lithium depletion in low-mass and solar-like stars as a function of
time, using a new diffusion coefficient describing extra-mixing taking place at
the bottom of a convective envelope. This new form is motivated by
multi-dimensional fully compressible, time implicit hydrodynamic simulations
performed with the MUSIC code. Intermittent convective mixing at the convective
boundary in a star can be modeled using extreme value theory, a statistical
analysis frequently used for finance, meteorology, and environmental science.
In this letter, we implement this statistical diffusion coefficient in a
one-dimensional stellar evolution code, using parameters calibrated from
multi-dimensional hydrodynamic simulations of a young low-mass star. We propose
a new scenario that can explain observations of the surface abundance of
lithium in the Sun and in clusters covering a wide range of ages, from
50 Myr to 4 Gyr. Because it relies on our physical model of convective
penetration, this scenario has a limited number of assumptions. It can explain
the observed trend between rotation and depletion, based on a single additional
assumption, namely that rotation affects the mixing efficiency at the
convective boundary. We suggest the existence of a threshold in stellar
rotation rate above which rotation strongly prevents the vertical penetration
of plumes and below which rotation has small effects. In addition to providing
a possible explanation for the long standing problem of lithium depletion in
pre-main sequence and main sequence stars, the strength of our scenario is that
its basic assumptions can be tested by future hydrodynamic simulations.Comment: 7 pages, 3 figures, Accepted for publication in ApJ Letter
THE PRESENCE OF THE MODERN INFRASTRUCTURE IN THE MIDDLE OF THE TRADITIONAL COMMUNITIES IN EAST TIMOR
Objective: The aim of this study is to find negative impacts of the construction of the modern infrastructure of the toll road and find out a good solution in East Timor.
Methods: The research methodology used is descriptive qualitative research methodology, namely, collecting data, interviewing key persons, making data deduction, analyzing data, drawing conclusions, and expressing recommendations, especially for the contractors and for the government.
Results: The construction of the toll road infrastructure megaprojects in the new country of Timor-Leste has both positive and negative impacts. The negative impact is huge and this is not taken into account by the contractors and the government in the construction of the Suai-Beasu toll road that connects the city of Suai on the South coast and the town of Dili on the North coast of the Democratic Republic of Timor-Leste. Hence, the recommendations suggested for the contractors and the government are to implement the aspirations of the communities, especially in the fair and just payment for the area used for the projects and building new cross-traffic for the residents alongside the toll road.
Conclusion: The presence of the toll road had positive impacts but there are several negative impacts on the lives of the Suai people, therefore, it is better that if the government and the contractors pay serious attention to overcome the negative impacts
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