bluuebunny/crossref_metadata_2025_split huggingface dataset:
‘We are all sondukarar (relatives)!’: kinship and its morality in an urban industry of Tamilnadu, South India
Authors: DE NEVE GEERT 
Published: May 2007

AbstractThis article is concerned with the role of kinship and kin morality in contexts of work in South Asia. It focuses on the highly ambivalent nature of kin morality when mobilised outside the household and the family. Ethnographic evidence from a small-scale industry in Tamilnadu, South India, shows how employers frequently invoke the morality of kinship and caste in an attempt to secure a reliable and compliant labour force and to avoid overt class confrontation. However, employers’ efforts to promote kinship—real or fictive—and its morality in the workplace appear inadequate in the face of high labour turnover and frequently collapsing employer-worker relationships in small-scale industries. While employers’ repeated use of kin ideology succeeds in silencing the workers on the shop floor, it is much less effective in securing a stable labour force in the long run. The argument put forward here points to the limits of kin morality and questions its effectiveness in informal contexts of labour employment. The discussion sheds new light on the role of caste and kinship in recruiting, retaining and disciplining labour in India's informal economy.
Modelling respiratory infection control measure effects
Authors: LIAO C. M. , CHEN S. C. , CHANG C. F. 
Published: May 2007

SUMMARYOne of the most pressing issues in facing emerging and re-emerging respiratory infections is how to bring them under control with current public health measures. Approaches such as the Wells–Riley equation, competing-risks model, and Von Foerster equation are used to prioritize control-measure efforts. Here we formulate how to integrate those three different types of functional relationship to construct easy-to-use and easy-to-interpret critical-control lines that help determine optimally the intervention strategies for containing airborne infections. We show that a combination of assigned effective public health interventions and enhanced engineering control measures would have a high probability for containing airborne infection. We suggest that integrated analysis to enhance modelling the impact of potential control measures against airborne infections presents an opportunity to assess risks and benefits. We demonstrate the approach with examples of optimal control measures to prioritize respiratory infections of severe acute respiratory syndrome (SARS), influenza, measles, and chickenpox.
236 years ago. . .
Authors: Valsecchi Giovanni B. 
Published: May 2007

AbstractSome of the problems related to Near Earth Objects (NEOs), like orbit determination and ephemeris computation, are not new, and had to be dealt with since the beginning of NEO astronomy. The latter practically started with the discovery of Comet D/1770 L1 Lexell, that passed very close to the Earth in 1770; studies of the chaotic dynamics of this exceptional object continued well into the XIXth century. At the end of the XXth century there has been a renewal of interest in NEOs, as attested by IAU Symposium 236.
Orbital evolution of short-period comets with high values of the Tisserand constant
Authors: Emel'yanenko N.Yu. 
Published: May 2007

AbstractThe orbital evolution of comets with high values of the Tisserand constant is studied for a time interval of 800 years. Scenarios of dynamical evolution are obtained for 85 comets. Particular features of the orbital evolution of the comets of this class are singled out. The orbits of all comets are tangent to the orbit of Jupiter and have a steadily low inclination. For 80% of comets, the evolution scenario includes a timespan in which the comets move in low-eccentricity orbits. The possibility is analyzed of a change in the Tisserand constant and of a transition of the comet to be controlled by other giant planets.
(Mostly) dormant comets in the NEO population and the meteoroid streams that they crumble into
Authors: Jenniskens Peter 
Published: May 2007

AbstractMany of our annual showers do not have active parent comets. In recent years, minor planets have been identified that move among the meteoroids streams. Some streams, such as the Quadrantids, Geminids, and Sextantids, are in such unusual orbits that the probability of a chance association is only of order 1 in 106. The streams identify those objects as dormant comet nuclei. Other streams, such as the Phoenicids and α-Capricornids are associated with minor planets that were found to be weakly active at their last perihelion passage. All the streams investigated so far are young, less than 2,000 years old, and can not have been created in the classical sense of meteoroids being ejected from the comet nucleus by water vapor drag. Instead, these (mostly) dormant comets lost fragments at some point in the past, which crumbled into meteoroid streams. Scars of such events are now identified on the surface of active Jupiter family comets 9P/Tempel 1 and 81P/Wild 2. Thus, the meteor showers on Earth bear witness to what is the dominant mass-loss mechanism of comets in the inner solar system, a process that can account for much of the zodiacal cloud dust and the zodiacal dust bands.
Properties of meteoroids from different classes of parent bodies
Authors: Borovička Jiří 
Published: May 2007

AbstractMeteoroids observed to disintegrate in the terrestrial atmosphere can be directly linked to their parent bodies in case that they belong to certain meteor showers. We present a list of two dozens of parent bodies reliably associated with well recognized meteor showers. Among the parent bodies are long period comets, Halley-type comets, Jupiter family comets, comets of the inner solar system (such as 2P/Encke) and asteroids. Physical and chemical properties of meteoroids coming from various parents are compared on the basis of meteor heights, decelerations, light curves and spectra. Jupiter family comets produce meteoroids with the lowest strength, namely porous aggregates of dust grains with bulk densities of about 0.3 g cm−3or less. Halley type material is somewhat stronger and the material related to comet Encke is even stronger. In addition, small strong constituents, perhaps similar to carbonaceous chondrites, can be encountered within the normal cometary material. The strength of cometary material is also enhanced by long-term exposure to cosmic rays and by solar heating in the vicinity to the Sun (r<0.2 AU). Both these processes lead to the loss of volatile sodium. Southern δ-Aquariids, Geminids and partly also Quadrantids were influenced by solar radiation. We argue that these showers, the asteroids associated with them ((3200) Phaethon and 2003 EH1), and the whole interplanetary complexes they belong to are of cometary origin. The argument is supported by lower than chondritic Fe/Mg ratio found in Geminids as well as in Halley type comets. The typical property of stony meteoroids of asteroidal origin is the presence of internal cracks which cause that the incoming meteoroids are much weaker than the recovered meteorites.
Automation of the Czech part of the European fireball network: equipment, methods and first results
Authors: Spurný Pavel , Borovička Jiří , Shrbený Lukáš 
Published: May 2007

AbstractIn the last several years the manually operated fish-eye cameras in the Czech part of the European fireball Network (EN) have been gradually replaced with new generation cameras, the modern and sophisticated completely autonomous fireball observatories (AFO), which were recently developed in the Czech Republic. The main motivation for construction of this new observing system was to continue in regular fireball observations and to make these observations more complex and efficient. In this paper we briefly describe basic design and work of this new instrument and its deployment at the Czech stations of the EN. The current dislocation of the individual stations and their equipment is also discussed. Along with this new modern instrument we developed also new software for measurement of photographic negatives which makes this time consuming work more efficient and easier. The AFOs provide us with data on fireballs far richer and more interesting than those we were able to get in the past. This is illustrated by the cases of two recently observed fireballs which were recorded by the AFOs. We describe the high precision of all the measureded values as well as the very detailed information about light curves in both cases.
Ondřejov's double-station observation of faint meteors using a TV technique (image intensifiers Dedal): 1998–2005
Authors: Štork Rostislav 
Published: May 2007

AbstractTV cameras equipped with image intensifiers are suitable and often used instruments for observing faint meteors. Our regular double-station observations with image intensifiers Dedal (type Dedal 41) started in 1998. Since 2006 we perform observations using new Mullard XX1332 intensifiers. In this paper we present an overview of the eight years of Dedal era. The amount of observing hours, number of meteors, statistics how many meteors were recognized using the automatic system MetRec or found manually, etc. are presented for each year. We also briefly overview the science results from these observations.
NEA rotations and binaries
Authors: Pravec Petr , Harris A. W. , Warner B. D. 
Published: May 2007

AbstractOf the nearly 3900 near-Earth asteroids (NEAs) known as of June 2006, 325 have estimated rotation periods, with most of those determined by lightcurve analysis led by a few dedicated programs. NEAs with diameters down to 10 meters have been sampled. Observed spin distribution shows a major changing point around diameter of 200 meters. Larger NEAs show a barrier against spins faster than 11 d−1(period about 2.2 h) that shifts to slower rates (longer periods) with increasing lightcurve amplitude (i.e., with increasing equatorial elongation). The spin barrier is interpreted as a critical spin rate for bodies in a gravity regime; NEAs larger than 200 meters are predominantly bodies with tensile strength too low to withstand a centrifugal acceleration for rotation faster than the critical spin rate. The cohesionless spin barrier disappears at sizes less than 200 meters where most objects rotate too fast to be held together by self-gravitation only, so a cohesion is implied in the smaller NEAs.The distribution of NEA spin rates in the cohesionless size range (D0.2 km) is highly non-Maxwellian, suggesting that mechanisms other than just collisions have been at work. There is a pile up just in front of the barrier, at periods 2–3 h. It may be related to a spin up mechanism crowding asteroids to the barrier. An excess of slow rotators is observed at periods longer than 30 hours. A spin-down mechanism has no obvious lower limit on spin rate; periods as long as tens of days have been observed.Most NEAs appear to be in their basic spin states with rotation around principal axis with maximum moment of inertia. Tumbling objects (i.e., bodies in excited, non-principal axis rotation) are present and actually predominate among slow rotators with estimated damping timescales longer than the age of the solar system. A few tumblers observed among fast rotating coherent objects appear to be either more rigid or younger than the larger (cohesionless) tumblers.An abundant population of binary systems has been found among NEAs. The fraction of binaries among NEAs larger than 0.3 km has been estimated to be 15 ± 4%. Primaries of binary systems concentrate at fast spin rates (periods 2–3 h) and low amplitudes, i.e., they lie just below the cohesionless spin barrier. The total angular momentum content in binary systems suggests that they formed from parent bodies spinning at the critical rate. The fact that a very similar population of binaries has been found among small main belt asteroids suggests a binary formation mechanism that may not be related to close encounters with the terrestrial planets.
Earth's 2006 encounter with comet 73P/Schwassmann-Wachmann: Products of nucleus fragmentation seen in closeup
Authors: Sekanina Zdeněk 
Published: May 2007

AbstractThe large numbers of nucleus fragments observed are a spectacular illustration of the process of cascading fragmentation in progress, a concept introduced to interpret the properties of the Kreutz system of sungrazers and comet D/1993 F2. The objective is to describe the fragmentation sequence and hierarchy of comet 73P, the nature of the fragmentation process and observed events, and the expected future evolution of this comet. The orbital arc populated by the fragments refers to an interval of 3.74 days in the perihelion time. This result suggests that they all could be products (but not necessarily first-generation fragments) of two 1995 events, in early September (involving an enormous outburst) and at the beginning of November. The interval of perihelion times is equivalent to a range of about 2.5 m/s in separation velocity or 0.00012 the Sun's attraction in nongravitational deceleration. Their combined effect suggests minor orbital momentum changes acquired during fragmentation and decelerations compatible with survival over two revolutions about the Sun. Fragment B is a likely first-generation product of one of the 1995 events. From the behavior of the primary fragment C, 73P is not a dying comet, even though fragment B and others were episodically breaking up into many pieces. Each episode began with the sudden appearance of a starlike nucleus condensation and a rapidly expanding outburst, followed by a development of jets, and a gradual tailward extension of the fading condensation, until the discrete masses embedded in it could be resolved. In April-May, this debris traveled first to the southwest, but models show their eventual motion toward the projected orbit. Fainter fragments were imaged over limited time, apparently because of their erratic activity (interspersed with periods of dormancy) rather than improptu disintegration. A dust trail joining the fragments and reminiscent of comet 141P/Machholz suggests that cascading fragmentation exerts itself profoundly over an extremely broad mass range of particulate debris.
Itokawa: The power of ground-based mid-infrared observations
Authors: Müller Thomas G. , Sekiguchi T. , Kaasalainen M. , Abe M. , Hasegawa S. 
Published: May 2007

AbstractPre-encounter ground-based thermal observations of NEA 25143 Itokawa at 10μm led to a size prediction of 520(±50) × 270(±30) × 230(±20)m, corresponding to an effective diameter of DTPMeff= 318m (Müller et al.2005). This is in almost perfect agreement with the final in-situ results 535 × 294 × 209m (DHayabusaeff= 320m; Demura et al.2006). The corresponding radar value, based on the same shape model (Kaasalainen et al.2005), were about 20% too high: 594 × 320 × 288m (DRadareff= 379m; Ostro et al.2005). The very simple N-band observations revealed a surface which is dominated by bare rocks rather than a thick regolith layer. This prediction was nicely confirmed by the Hayabusa mission (e.g., Fujiwara et al.2006; Saito et al.2006). The ground-based measurements covered three different phase angles which enabled us to determine the thermal properties with unprecedented accuracy and in excellent agreement with the results from the touch-down measurements (Okada et al.2006; Yano et al.2006). These thermal values are also key ingredients for high precision Yarkovsky and YORP calculations (mainly the rotation slowing) for Itokawa (e.g., Vokrouhlický et al.2004; Vokrouhlický et al.2005). In addition to the above mentioned properties, our data allowed us to derive the surface albedo and to estimate the total mass. We believe that with our well-tested and calibrated radiometric techniques (Lagerros 1996,1997,1998; Müller & Lagerros 1998, 2002; Müller 2002) we have tools at hand to distinguish between monolithic, regolith-covered and rubble pile near-Earth objects by only using remote thermal observations. This project also emphasizes the high and so far not yet fully exploited potential of thermophysical modeling techniques for the NEA/NEO exploration.
Current NEO surveys
Authors: Larson Stephen 
Published: May 2007

AbstractThe state and discovery rate of current NEO surveys reflect incremental improvements in a number of areas, such as detector size and sensitivity, computing capacity, detection software efficiency and availability of larger telescope apertures. The result has been an increase in the NEO discovery rate. There are currently eight telescopes ranging in size from 0.5-1.5 meters carrying out full-or part-time systematic surveying in both hemispheres. The sky is covered 1-2 times per lunation to V1~9, with a band near the ecliptic to V2~0.5. We review the current survey programs and their contributions towards the Spaceguard goal of discovering at least 90% of the NEOs larger than 1 km.
Searching for NEOs using Lowell observatorys Discovery Channel Telescope (DCT)
Authors: Bowell Edward , Millis Robert L. , Dunham Edward W. , Koehn Bruce W. , Smith Byron W. 
Published: May 2007

AbstractWe discuss the potential contribution of the Discovery Channel Telescope (or a clone) to a detection program aimed at discovering 90% of potentially hazardous objects (PHOs) larger than 140 m in diameter. Three options are described, each involving different levels of investment. We believe that LSST, Pan-STARRS, and DCT, working in a coordinated fashion, offer a cost-effective, low-risk way to accomplish the objectives of the extended NEO search program.
NEO search telescope in China
Authors: Ma Yuehua , Zhao Haibin , Yao Dazhi 
Published: May 2007

AbstractChinese scientists have contributed many research works to the field of asteroid surveying and related topics. In the early 1960s, Purple Mountain Observatory (PMO) began observing asteroids and found over 130 new numbered asteroids during the following decades. The Schmidt CCD Asteroid Program (SCAP) of Beijing Astronomical Observatory (BAO) started in 1995 and found 575 asteroids in several years.NEOs represent a great threat to the near-Earth environment by closely approaching Earth or even impacting with Earth. After the impact of comet SL9 on Jupiter, Chinese proposed to build a NEO Search Telescope to take part in the joint international NEO survey. It is a 1.0/1.2 m Schmidt telescope with a 4K×4K drift scanning CCD detector. Here we elaborate upon its applications to objects of scientific interest, its parameters, and its observing station.
The UK Near Earth Object Information Centre (NEOIC)
Authors: Williams Iwan P. 
Published: May 2007

AbstractFollowing the report of the ‘task force’, the UK Government decided to accept some of it's recommendations. In particular, it accepted two that recommended the setting up of a British National Centre for Near Earth Objects. The final outcome was the setting up of a Near Earth Object Information Centre to inform the general public of the dangers or otherwise from impact on the Earth of Near Earth Objects. The Centre has now been running for several years and in this publication we examine the current workings of the Centre and discuss some of its successes and failures.
Information Literacy for Speech-Language Pathologists: A Key to Evidence-Based Practice
Authors: Nail-Chiwetalu Barbara J. , Ratner Nan Bernstein 
Published: May 2007

Purpose
In this tutorial, we review the tenets of information literacy (IL) that parallel and intersect with new American Speech-Language-Hearing Association (ASHA) certification standards requiring clinicians to engage in evidence-based practice (EBP).

Method

A review of the literature on EBP in medical and allied health areas was conducted through an online database search. The
Information Literacy Competency Standards for Higher Education
(American Library Association, 2004) are used as a framework for outlining IL practices that will aid in EBP.

Results
Current strategies are contrasted with more desirable strategies. Potential barriers to the utilization of information-literate procedures in locating sources of reliable clinical evidence are discussed together with potential solutions.

Conclusion
Suggestions for more efficient information searches by clinicians, as well as a proposed discipline-wide agenda for increasing clinicians' IL skills during and after entry-level graduate training, are provided.
Structural Development of the Fictional Narratives of African American Preschoolers
Authors: Price Johanna R. , Roberts Joanne E. , Jackson Sandra C. 
Published: May 2007

Purpose
This study examined the structural development of African American preschoolers' narratives. It also investigated the effect of background variables (e.g., gender, maternal education, stimulation and responsiveness of the home environment, and whether or not the child lived in poverty) on the children’s narratives.

Method
Sixty-five children completed a story-retelling task at age 4 and again at kindergarten entry. Narratives were then coded for story grammar elements.

Results
Four-year-olds narrated some attempts to solve the problem and some elements of the story ending. At kindergarten entry, children had higher total narrative scores and included more of every type of story grammar element except relationship. Overall, narratives were not related to background variables.

Clinical Implications
The Bus Story Language Test (C. Renfrew, 1991) appears to be an assessment tool that is sensitive to structural growth in African American children’s narratives from 4 years to kindergarten entry.
Contributions of Mother–Child Storybook Telling and Joint Writing to Literacy Development in Kindergartners With Hearing Loss
Authors: Aram Dorit , Most Tova , Mayafit Hanny 
Published: May 2007

PurposeThis study investigated mother–child storybook telling and joint writing as predictors of early literacy among kindergartners with hearing loss.MethodParticipants were 30 Israeli kindergartners with hearing loss and their mothers. Early literacy assessments tapped children’s alphabetic skills (e.g., word writing, word recognition, and letter knowledge) and linguistic skills (e.g., phonological awareness, general knowledge, and receptive vocabulary). Each mother told her child the story of a wordless book and helped her child write words. Both interactions were videotaped and analyzed.ResultsOur major findings showed that maternal storybook telling correlated with linguistic skills, and maternal writing mediation correlated with basic alphabetic skills. A series of 3-step hierarchical regression analyses revealed that beyond children’s age, children’s degree of hearing loss, and joint writing, storybook telling predicted children’s phonological awareness (22%), general knowledge (28%), and receptive vocabulary (18%). Beyond children’s age, children’s degree of hearing loss, and storybook telling, joint writing predicted word writing (15%), word recognition (31%), and letter knowledge (36%).ImplicationsRecommendations focused on encouraging parent and teacher awareness about the differential contributions of storybook telling and writing mediation to early literacy. We also advocated enhancing parents' skills for promoting children’s literacy.