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Attraction
Kinds of Attraction Selected AbstractsMOTIVATIONAL, ETHICAL, AND EPISTEMOLOGICAL FOUNDATIONS IN THE TREATMENT OF UNWANTED HOMOEROTIC ATTRACTIONJOURNAL OF MARITAL AND FAMILY THERAPY, Issue 1 2003Christopher H. Rosik A recent special section of the Journal of Marital and Family Therapy(October, 2000) focusing on the mental health needs of gay, lesbian, and bisexual individuals neglected to address the clinical needs of homosexual persons who desire to increase their heterosexual potential. This article attempts to correct this omission by outlining common motivations for pursuing change, updating the current state of knowledge regarding the effectiveness of change efforts, and providing some ethical guidelines when therapists encounter clients who present with unwanted homoerotic attraction. Finally, to assist marriage and family therapists (MFTs) in more deply understanding divergent perspectives about reorientation treatments, an examination of the role of moral epistemology is presented and some examples of its potential influence are described. MFTs are encouraged to recognize and accept, rather than ignore or deny the valid needs of clients who seek to modify their same-sex attraction. [source] ROLE CONFLICT AND FLEXIBLE WORK ARRANGEMENTS: THE EFFECTS ON APPLICANT ATTRACTIONPERSONNEL PSYCHOLOGY, Issue 1 2002BARBARA L. RAU This paper challenges a popular assumption that organizations with flexible work arrangements are more attractive to job seekers than those with a standard work arrangement. Drawing on boundary theory, we suggest that the attractiveness of these arrangements depends in part on job seekers' interrole conflict. Subjects were 142 MBA students at a midsized midwestern university. Those with high role conflict were more attracted to an organization when flextime was offered than when it was not. Those with low role conflict, however, were just slightly less attracted to an organization when flextime was offered. Conversely, subjects with low role conflict were more attracted to an organization when telecommuting was offered than when it was not; subjects with high role conflict were indifferent. These results suggest that organizations should understand the needs of their targeted applicant pool and carefully consider recruitment implications of work arrangements when analyzing costs associated with these policies. [source] FATAL ATTRACTION: THE WHITE OBSESSIONWITH INDIANNESSTHE HISTORIAN, Issue 4 2003JENNIFER DYAR First page of article [source] GAMBLING BENEFICIARIES HAVING THEIR CAKE AND EATING IT: THE ATTRACTIONS OF AVOIDING RESPONSIBLE GAMBLING REGULATIONADDICTION, Issue 5 2009PETER J. ADAMS No abstract is available for this article. [source] Female Attraction to Conspecific Chemical Cues in the Palmate Newt Triturus helveticusETHOLOGY, Issue 8 2005Jean Secondi Although chemosignals are largely used in sexual communication in urodeles, olfactometer studies in newts provided contrasting results about the sex specificity of female behavioural responses. Because long-range sexual advertisement is believed to be costly, some species might restrain this activity to close interactions with conspecifics. We tested chemical-mediated sexual attraction in female palmate newt (Triturus helveticus) by measuring the attraction to male and female odours in a linear water olfactometer. Unexpectedly, females were attracted towards conspecifics regardless of sex. They did not show attraction towards Limnaea stagnalis, a common sympatric aquatic gastropod. These results do not support the use of long-range male sexual signalling in the palmate newt. Instead, conspecific attraction is likely to promote aggregation of males and females in breeding ponds. Observations in the field and in the laboratory tend to support the aggregative behaviour of this species. We discuss the possible function of conspecific attraction in this context. Heading towards any conspecific would increase the probability of finding potential mates. Chemical cues do not need to be sex-specific at that stage so that long-range sexual advertisement might be unnecessary. This work emphasizes the need for studies investigating the evolutionary relationships between sexual signalling systems and population-distribution patterns. [source] Natal Attraction in Adult Female Baboons (Papio cynocephalus ursinus) in the Moremi Reserve, BotswanaETHOLOGY, Issue 8 2003Joan B. Silk Mammalian females are strongly attracted to infants and interact regularly with them. Female baboons make persistent attempts to touch, nuzzle, smell and inspect other females' infants, but do not hold them for long periods, carry them, or provide other kinds of care for them. Mothers generally tolerate these interactions, but never initiate them. The function of these brief alloparental interactions is not well understood. Infant handling might be a form of reproductive competition if females' interest in infants causes distress to mothers or harm to their infants. Alternatively, infant handling might be the product of selection for appropriate maternal care if females who are highly responsive to infants are the most successful mothers. We test several predictions derived from these hypotheses with data collected in a free-ranging group of baboons (Papio cynocephalus ursinus) in the Moremi Reserve of Botswana. Infants were most attractive when they were very young. Mothers of young infants were approached by other adult females on average once every 6 min, and other females attempted to handle their infants approximately once every 9 min. By the time infants were a year old, their mothers were being approached only once every 30 min and infants were being handled only once every 5 h. Females were more strongly attracted to other females' infants when they had young infants of their own, and their interest in other females' infants declined as their own infants matured. Females seemed to be equally attracted to all infants, but had greater access to offspring of their relatives and subordinate females. Females nearly always grunted as they handled infants. As in other contexts grunts are a reliable predictive signal that non-aggressive behavior will follow, the use of grunts before handling suggests that these interactions were not a form of deliberate harassment. [source] Stability of Hoogsteen -Type Triplexes , Electrostatic Attraction between Duplex Backbone and Triplex-Forming Oligonucleotide (TFO) Using an Intercalating ConjugateHELVETICA CHIMICA ACTA, Issue 5 2008Daniel Globisch Abstract Syntheses are described for two novel twisted intercalating nucleic acid (TINA) monomers where the intercalator comprises a benzene ring linked to a naphthalimide moiety via an ethynediyl bridge. The intercalators Y and Z have a 2-(dimethylamino)ethyl and a methyl residue on the naphthalimide moiety, respectively. When used as triplex-forming oligonucleotides (TFOs), the novel naphthalimide TINAs show extraordinary high thermal stability in Hoogsteen -type triplexes and duplexes with high discrimination of mismatch strands. DNA Strands containing the intercalator Y show higher thermal triplex stability than DNA strands containing the intercalator Z. This observation can be explained by the ionic interaction of the protonated dimethylamino group under physiological conditions, targeting the negatively charged phosphate backbone of the duplex. This interaction leads to an extra binding mode between the TFO and the duplex, in agreement with molecular-modeling studies. We believe that this is the first example of an intercalator linking the TFO to the phosphate backbone of the duplex by an ionic interaction, which is a promising tool to achieve a higher triplex stability. [source] Applicant Attraction: The role of recruiter function, work,life balance policies and career salienceINTERNATIONAL JOURNAL OF SELECTION AND ASSESSMENT, Issue 4 2007Sally A. Carless This study examined the impact of salient identity, career path and recruiter functional area [internal human resource (HR) personnel vs external recruitment company] on perceptions of organizational attraction with a sample of young, inexperienced job seekers. Two hundred and one participants responded to a questionnaire and rated their attraction to two different job advertisements. The results partially supported the first hypothesis; applicants perceived a job opportunity in an organization that offered either a flexible career path or a dual career path as significantly more attractive than a position in an organization that offered a traditional career path. There was no support for the second hypothesis that identity salience would interact with career path. The results showed that recruiter functional area had no impact on attraction to the organization. It was concluded that flexible HR policies increase applicants' perceptions of organizational attraction during the initial stages of the recruitment process. Practical and research applications are discussed. [source] Attraction and fecundity of adult codling moth, Cydia pomonella, as influenced by methoxyfenozide-treated electrostatic powderJOURNAL OF APPLIED ENTOMOLOGY, Issue 9-10 2009J. Huang Abstract The attractiveness and responsiveness of adult codling moths, Cydia pomonella (L.), exposed to EntostatTM powder with or without the ecdysteroid agonist, methoxyfenozide, were investigated in a flight tunnel. Coating males with either EntostatTM powder alone or powder plus methoxyfenozide 1 or 24 h prior to flight tunnel assays did not influence the mean percentages of males successfully orienting to a female-equivalent lure relative to unexposed control moths. The fecundity of females paired with males exposed to EntostatTM powder plus methoxyfenozide was significantly lower than that for females paired with unexposed males. This reduction in egg output was similar to that observed when methoxyfenozide-treated females were paired with untreated males, indicating that males can successfully pass methoxyfenozide to their partners during copulation. However, EntostatTM powder alone carried by male moths did not affect female fecundity after mating. EntostatTM powder has the potential to carry pesticides for C. pomonella control by autodissemination. [source] Evaluation of semiochemicals potentially synergistic to ,-pinene for trapping the larger European pine shoot beetle, Tomicus piniperda (Col., Scolytidae)JOURNAL OF APPLIED ENTOMOLOGY, Issue 9-10 2004T. M. Poland Abstract:, The pine shoot beetle, Tomicus piniperda (L.) (Col., Scolytidae) is an exotic pest of pine, Pinus spp., in North America. It is attracted strongly to host volatiles (±)- , -pinene, (+)-3-carene, and , -terpinolene. Attraction to insect-produced compounds is less clear. Other potential attractants include trans -verbenol, myrtenol, myrtenal, nonanal and , -pinene oxide. We conducted a series of field experiments to determine if any of these compounds would increase attraction of T. piniperda to , -pinene, either individually or in various combinations. None of the individual compounds increased attraction. Although several combinations that included trans -verbenol, nonanal, myrtenol, or myrtenal increased attraction, results were variable between experiments. [source] Attraction of garden chafer, Phyllopertha horticola, to floral Japanese beetle lureJOURNAL OF APPLIED ENTOMOLOGY, Issue 2 2004J. Ruther Abstract: Field experiments using funnel traps were performed on a golf course to investigate the attractiveness of a floral Japanese beetle lure for adults of the garden chafer, Phyllopertha horticola, a common European turf pest. Traps baited with 10 mg of the floral lure consisting of phenylethyl propionate + eugenol + geraniol (3 : 7 : 3) captured more adult garden chafers of both sexes than non-baited control traps. In contrast, 1,3-dimethyl-2,4-(1H, 3H)-quinazolinedione, the sex pheromone of the closely related pale-brown chafer P. diversa, neither influenced alone nor in combination with the floral lure the behaviour of adult garden chafers. The results suggest that the floral Japanese beetle lure might be used for monitoring or control of P. horticola. [source] Attraction of slimy sculpins to chemical cues of brook charr eggsJOURNAL OF FISH BIOLOGY, Issue 3 2002R. S. Mirza In a laboratory study to examine the responses of slimy sculpin Cottus cognatus to chemical cues of brook charr Salvelinus fontinalis eggs, water that held freshly laid eggs (<20 min old), water-hardened eggs (i.e. eggs >4 h old) or injured eggs was collected and used in a series of two-choice tests. Slimy sculpin were exposed to paired stimuli of (1) hard egg water v. control water, (2) fresh egg water v. control water, (3) hard egg water v. injured egg water or (4) hard egg water v. fresh egg water. Sculpin spent considerably more time on the side of the tank with hard egg water and fresh egg water v. control water and injured egg water v. hard egg water. Sculpin did not show a preference for hard egg water v. fresh egg water. In a field study, brook charr were attracted to chemical cues from brook charr eggs, suggesting that brook charr eggs produce sufficient odour to attract some species under natural conditions. [source] Attraction of ambrosia and bark beetles to coast live oaks infected by Phytophthora ramorumAGRICULTURAL AND FOREST ENTOMOLOGY, Issue 4 2008Brice A. McPherson Abstract 1,Sudden oak death is caused by the apparently introduced oomycete, Phytophthora ramorum. We investigated the role of bark and ambrosia beetles in disease progression in coast live oaks Quercus agrifolia. 2,In two Marin County, California sites, 80 trees were inoculated in July 2002 with P. ramorum and 40 were wounded without inoculation. Half of the trees in each group were sprayed with the insecticide permethrin [cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-(3-phenoxyphenyl) methyl ester] to prevent ambrosia and bark beetle attacks, and then were sprayed twice per year thereafter. After each treatment, sticky traps were placed on only the permethrin-treated trees. Beetles were collected periodically in 2003. 3,Inoculated trees accounted for 95% of all beetles trapped. The ambrosia beetles Monarthrum scutellare and Xyleborinus saxeseni and the western oak bark beetle Pseudopityophthorus pubipennis were the most abundant of the seven species trapped. 4,Permethrin treatment delayed initiation of beetle attacks and significantly reduced the mean number of attacks per tree. Beetles did not attack any wounded or noncankered inoculated trees. 5,Trees with larger cankers trapped more beetles early in the disease. Once permethrin lost effectiveness, the number of beetle entrance tunnels was a more reliable predictor of subsequent trap catch than was canker size. 6,Beetles were initially attracted to P. ramorum cankers in response to kairomones generated in the host-pathogen interaction. After beetles attacked the permethrin-treated trees, aggregation pheromones most probably were the principal factor in beetle colonization behaviour. [source] Effect of varying monoterpene concentrations on the response of Ips pini (Coleoptera: Scolytidae) to its aggregation pheromone: implications for pest management and ecology of bark beetlesAGRICULTURAL AND FOREST ENTOMOLOGY, Issue 4 2003Nadir Erbilgin Abstract 1,Host plant terpenes can influence attraction of conifer bark beetles to their aggregation pheromones: both synergistic and inhibitory compounds have been reported. However, we know little about how varying concentrations of individual monoterpenes affect responses. 2,We tested a gradient of ratios of ,-pinene, the predominant monoterpene in host pines in the Great Lakes region of North America, to Ips pini's pheromone, racemic ipsdienol plus lanierone. 3,Ips pini demonstrated a parabolic response, in which low concentrations of ,-pinene had no effect on attraction to its pheromone, intermediate concentrations were synergistic and high concentrations were inhibitory. These results suggest optimal release rates for population monitoring and suppression programmes. 4,Inhibition of bark beetle attraction to pheromones may be an important component of conifer defences. At terpene to pheromone ratios emulating emissions from trees actively responding to a first attack, arrival of flying beetles was low. This may constitute an additional defensive role of terpenes, which are also toxic to bark beetles at high concentrations. 5,Reduced attraction to a low ratio of ,-pinene to pheromone, as occurs when colonization densities become high and the tree's resin is largely depleted, might reflect a mechanism for preventing excessive crowding. 6,Thanasimus dubius, the predominant predator of I. pini, was also attracted to ipsdienol plus lanierone, but its response differed from that of its prey. Attraction increased across all concentrations of ,-pinene. This indicates that separate lures are needed to sample both predators and bark beetles effectively. It also provides an opportunity for maximizing pest removal while reducing adverse effects on beneficial species. This disparity further illustrates the complexity confronting natural enemies that track chemical signals to locate herbivores. [source] What Leads to Romantic Attraction: Similarity, Reciprocity, Security, or Beauty?JOURNAL OF PERSONALITY, Issue 4 2009Evidence From a Speed-Dating Study ABSTRACT Years of attraction research have established several "principles" of attraction with robust evidence. However, a major limitation of previous attraction studies is that they have almost exclusively relied on well-controlled experiments, which are often criticized for lacking ecological validity. The current research was designed to examine initial attraction in a real-life setting,speed-dating. Social Relations Model analyses demonstrated that initial attraction was a function of the actor, the partner, and the unique dyadic relationship between these two. Meta-analyses showed intriguing sex differences and similarities. Self characteristics better predicted women's attraction than they did for men, whereas partner characteristics predicted men's attraction far better than they did for women. The strongest predictor of attraction for both sexes was partners' physical attractiveness. Finally, there was some support for the reciprocity principle but no evidence for the similarity principle. [source] Promises Made, Promises Broken: An Exploration of Employee Attraction and Retention Practices in Small BusinessJOURNAL OF SMALL BUSINESS MANAGEMENT, Issue 4 2001Jill Kickul Entrepreneurial organizations have undergone substantial workforce changes and transformations during the last two decades in order to compete successfully on a global scale. The ability to attract and retain reliable and competent employees has become a key component in developing an effective and sustainable competitive advantage. The purpose of this study is to investigate the role of the psychological contract and the types of promises made and communicated by small business organizations to attract and retain their employees. From a sample of 151 employees within small businesses, the results demonstrate that perceived unfulfilled promises can have a considerable impact on workplace attitudes, commitment, and intentions to leave the organization. Implications and recommendations for small businesses as well as directions for future research are discussed. [source] Relationship Formation on the Internet: What's the Big Attraction?JOURNAL OF SOCIAL ISSUES, Issue 1 2002Katelyn Y. A. McKenna We hypothesized that people who can better disclose their "true" or inner self to others on the Internet than in face-to-face settings will be more likely to form close relationships on-line and will tend to bring those virtual relationships into their "real" lives. Study 1, a survey of randomly selected Internet newsgroup posters, showed that those who better express their true self over the Internet were more likely than others to have formed close on-line relationships and moved these friendships to a face-to-face basis. Study 2 revealed that the majority of these close Internet relationships were still intact 2 years later. Finally, a laboratory experiment found that undergraduates liked each other more following an Internet compared to a face-to-face initial meeting. [source] Molecular Reproduction & Development: Volume 76, Issue 6MOLECULAR REPRODUCTION & DEVELOPMENT, Issue 6 2009Article first published online: 8 APR 200 Differential interference contrast image of Xenopus laevis sperm. These sperm have a helical head and swim in a helical trajectory. The 15 µm long head exhibits a textured mid-piece at the rear into which the fl agellum is anchored. Attraction of these sperm to the egg-derived protein allurin is studied by Sugiyama et al. in this issue. [source] Perceived locus of control and satisfaction in same,sex friendshipsPERSONAL RELATIONSHIPS, Issue 4 2003Marian M. Morry Two studies examined perceptions of locus of control (LofC) and friendship satisfaction. Study 1 tested the accuracy of college students' perceptions of a friend's LofC and their friendship satisfaction. Participants perceived their friends to be similar to themselves on LofC and satisfaction but these perceptions did not match the friends' self,ratings. Instead, the perceptions reflected a belief in the similarity to the self,the Attraction,Similarity Hypothesis. Study 2 tested whether own and perceived friend's LofC predicted own satisfaction. The Internality Hypothesis indicates that an external LofC would predict dissatisfaction but an internal LofC would predict satisfaction. It was also predicted that these effects would be stronger for women's friendships than for men's friendships. For female, but not male, friendships, perceptions of the friend's external LofC predicted dissatisfaction. [source] Population change due to geographic mobility in Albania, 1989,2001, and the repercussions of internal migration for the enlargement of TiranaPOPULATION, SPACE AND PLACE (PREVIOUSLY:-INT JOURNAL OF POPULATION GEOGRAPHY), Issue 6 2007Michalis Agorastakis Abstract Being a country in transition, Albania has sustained vast political and socio-economic changes over the past 15 years, mostly due to its engagement in democratisation and transformation to an open market economy. The pathway to transition has involved economic hardship and political unrest and has been accompanied by intense, large-scale, geographical mobility. This paper describes population change due to internal and international migration, 1989,2001, using Census data at district level. Its contribution is a technical one in applying a method that allows new estimates to be made of the scale of internal migration in Albania. Descriptive analysis of population changes in 36 Albanian districts, based on the last two censuses, lead to the identification of poles of attraction of internal migrants. Limited data concerning the 1989 Census and the 12 years between the censuses resulted in the creation of various indices that characterise internal migration, such as the Attraction and Expulsion Index stemming from the Origin,Destination Matrix of the districts. In addition an Index of Conservation of the population and an Index of External Migration were also derived at the district level. By considering internal and international migration as two separate phenomena, we emphasise their uniqueness in affecting population change in Albania. The District of Tirana, capital of Albania, absorbed the majority of the inflow of internal migrants. The latter part of the paper focuses on the population of Tirana as the county's major migration destination. Copyright © 2007 John Wiley & Sons, Ltd. [source] A Method to Intraoperatively Assess Stapes Prostheses for Magnetic Attraction,THE LARYNGOSCOPE, Issue 12 2003David W. White MD Abstract Objective To present a technique used to assess metallic otologic protheses for magnetic susceptibility during surgery. Study Design Description of a surgical technique. Methods A sterile handheld pacemaker magnet is used to evaluate the prothesis prior to implantation. The magnet is placed over the prosthesis and the prosthesis is placed directly on the magnet. Any evidence of magnetic attraction and the prosthesis is rejected prior to implantation. Results None of the prostheses screened showed any magnetic attraction. As a control, steel wire was cut into pieces with dimensions similar to prostheses. These sections of wire were readily attracted to the magnet. Conclusions Intraoperative screening of metallic prostheses for magnetic susceptibility is possible using a sterile handheld pacemaker magnet. [source] Different Stimuli Reduce Attraction to Pollinators in Male and Female Figs in the Dioecious Fig Ficus hispidaBIOTROPICA, Issue 6 2009Hao-Yuan Hu ABSTRACT Fig trees (Ficus) and their obligate pollinating wasps (Hymenoptera, Chalcidoidea, Agaonidae) are a classic example of a coevolved mutualism. Pollinating wasps are attracted to figs only when figs are receptive. It has been shown that figs will lose their attraction to pollinators sooner in monoecious and male dioecious figs when multiple pollinators have entered the enclosed inflorescence. However, little is known about the nature of the stimulus inducing the loss of attraction. By conducting experiments on the functionally dioecious fig, Ficus hispida, we show that (1) different stimuli induce the loss of attraction in each sex, pollination in female figs, and oviposition in male figs; and (2) foundress number affects the loss of attraction in both sexes only when the prerequisites (i.e., pollination in female figs and oviposition in male figs) have been satisfied. In general, the more foundresses that enter, the earlier the fig will lose its receptivity. We argue that the stimuli in male and female figs are adaptations to the fulfillment of its respective reproduction. [source] Karren of Mushroom Mountain (Junzi Shan) in the Eastern Yunnan Ridge, Yunnan, China: Karstological and Tourist AttractionACTA GEOLOGICA SINICA (ENGLISH EDITION), Issue 2 2010Martin KNEZ Abstract: Mushroom Mountain karren with predominantly flat tops that formed along the stylolites and bedding planes dictated the special features of this karst landscape. Their features and rock relief clearly reflect the geological conditions and development. The subsoil karren with conical tops dissected by subsoil rock relief were exposed from beneath the soil. Below tree vegetation, the subsoil karren are to a great extent covered by moss and lichen, under which they acquire their characteristic shape. On the bare surface they were reshaped by rainwater that carves flutes and solution pans. The old cave that opens below the top of one of the cones reveals the period before its dissection into hills and cones when this part of the karst aquifer was still deep under the water table. [source] Decoding the Signal Effects of Job Candidate Attraction to Corporate Social PracticesBUSINESS AND SOCIETY REVIEW, Issue 2 2010SARAH SORENSON ABSTRACT This article seeks to go beyond the implied assumption from previous research that job candidate attraction to corporate social practices is equivalent across individuals. To this end, we propose a framework for categorizing individuals' attraction to different corporate social performance profiles. Our framework is grounded in relational models theory and Mitroff's model of managers' "ideal organizations." An inductive approach was used to elaborate upon the model and assess the extent to which candidates preferences vary. Data were collected from prospective job seekers regarding their attraction to social practices that benefit or harm various stakeholders, and these responses were used to develop profiles of job candidates' attraction to distinct profiles of organizations' social practices. The results provide a guide for managers who wish to improve the likelihood that an organization's social practices reflect what is best about its culture. [source] NH/, Attraction: A Role in Asymmetric Hydrogenation of Aromatic Ketones with Binap/1,2-Diamine-Ruthenium(II) ComplexesCHEMISTRY - AN ASIAN JOURNAL, Issue 8 2009Christian Role model: Electrostatic NHeq/, attraction plays an important role in asymmetric hydrogenation of acetophenones catalyzed by chiral [RuX2(diphosphine)(1,2-diamine)] complexes. The relative rate of p -substituted ketones bears a Hammett linear relationship with ,=1.03 but with a notable exception for the p -fluoro ketone. The enantioselectivity is enhanced by an electron-donating p substituent and is decreased by an electron donor. [source] Attractions and constraints as determinants of relationship commitment: Longitudinal evidence from gay, lesbian, and heterosexual couplesPERSONAL RELATIONSHIPS, Issue 3 2000LAWRENCE A. KURDEK The proposition that commitment to a relationship is uniquely determined by forces that draw one to the relationship (attractions) and forces that prevent one from leaving the relationship (constraints) was tested with five annual waves of longitudinal data from two samples: both partners from 155 married couples and both partners from 57 gay couples and 50 lesbian couples. Growth curve analyses that controlled for the interdependence of partners' scores indicated that, for both heterosexual and gay/lesbian couples, variability in one's own commitment was uniquely predicted by one's own attractions and one's own constraints, interactions involving one's own attractions and one's own constraints, and one's partner's attractions. It is concluded that attractions and constraints exert unique dynamic effects on maintaining a close relationship. [source] Hybrid Simulation of Miscible Mixing with Viscous FingeringCOMPUTER GRAPHICS FORUM, Issue 2 2010Seung-Ho Shiny Abstract By modeling mass transfer phenomena, we simulate solids and liquids dissolving or changing to other substances. We also deal with the very small-scale phenomena that occur when a fluid spreads out at the interface of another fluid. We model the pressure at the interfaces between fluids with Darcy's Law and represent the viscous fingering phenomenon in which a fluid interface spreads out with a fractal-like shape. We use hybrid grid-based simulation and smoothed particle hydrodynamics (SPH) to simulate intermolecular diffusion and attraction using particles at a computable scale. We have produced animations showing fluids mixing and objects dissolving. [source] Demography of the California Condor: Implications for ReestablishmentCONSERVATION BIOLOGY, Issue 4 2000Vicky J. Meretsky The most prominent mortality factor was lead poisoning resulting from ingestion of bullet fragments in carcasses. Successful captive breeding has allowed many birds to be released to the wild since 1992, based originally on an assumption that exposure to lead could be prevented by food subsidy. The mortality of released birds, however, has generally exceeded levels needed for population stability calculated from simple population models. Collision with overhead wires was the most frequent cause of death in releases before 1994. Lead poisoning again surfaced as a problem starting in 1997 as older birds began feeding on carcasses outside the subsidy program. Although poisonings have been treated successfully by chelation therapy in recaptured birds, food subsidy is proving an ineffective solution to lead exposure. The best long-term solution appears to be either the creation of large reserves where hunting is prohibited or the restriction of hunting to nontoxic ammunition in release areas. Until sources of lead contamination are effectively countered, releases cannot be expected to result in viable populations. In addition, problems involving human-oriented behavior have resulted in the permanent removal of many released birds from the wild. The most promising reduction in human-oriented behavior has been achieved in one release of aversively conditioned, parent-reared birds. Rigorous evaluation of the factors reducing attraction to humans and human structures has been hampered by confounding of techniques in releases. Behavioral problems could be more quickly overcome by adoption of a comprehensive experimental approach. Resumen: Las poblaciones silvestres remanentes del cóndor de California (Gymnogyps californianus) de los anõs 80 exhibieron una disminución poblacional rápida debido a altas tasas de mortalidad de individuos adultos e inmaduros. El factor de mortalidad más prominente fue el envenenamiento por plomo ocasionado por la ingestión de fragmentos de municiones en cadáveres. La reproducción exitosa en cautiverio ha permitido muchas liberaciones en ambientes silvestres desde 1992, bajo el argumento de que la exposición al plomo puede ser prevenida mediante el subsidio de alimento. Sin embargo, la mortalidad de aves liberadas ha excedido generalmente los niveles necesarios para alcanzar una estabilidad poblacional calculada a partir de modelos poblacionales simples. Las colisiones con alambres en lo alto fueron la causa más frecuente de las muertes en liberaciones anteriores a 1994. A partir de 1997, el envenenamiento con plomo surgió una vez más como un problema, puesto que las aves de edad avanzada comenzaron a alimentarse de cadáveres fuera del programa de subsidio. A pesar de que el envenenamiento ha sido tratado exitosamente mediante terapia de quelación de las aves recapturadas, el subsidio de alimento ha probado ser una solución ineficaz contra la exposición al plomo. Las mejores soluciones de largo plazo aparentan ser la creación de reservas grandes donde la caza sea prohibida o se restrinja la caza a municiones no tóxicas en las áreas de liberación. Solo una vez que la contaminación por plomo sea contrarrestada efectivamente, no se podrá esperar que las liberaciones resulten en poblaciones viables. Además, los problemas de conductas orientadas hacia humanos ha resultado en la remoción permanente de muchas aves liberadas de zonas silvestres. La reducción más prometedora de conductas orientadas hacia humanos ha sido obtenida en una liberación de aves criadas por sus padres y condicionadas adversamente. La evaluación rigurosa de los factores que reducen la atracción hacia humanos y estructuras de humanos ha sido obstaculizada por la confusión de técnicas en las liberaciones. Los problemas de conducta podrían ser superados más rápidamente mediante la adopción de una estrategia experimental comprensiva. [source] Dispersion of Dust Acoustic Modes and Perturbations of Plasma Flux BalanceCONTRIBUTIONS TO PLASMA PHYSICS, Issue 3 2007V. Tsytovich Abstract Previous considerations of dust acoustic waves is demonstrated to be inconsistent - the required equilibrium state for perturbations was not defined since balance of plasma fluxes was neglecting. The self-consistent treatment shows that plasma flux perturbations are accompanying any collective waves propagating in dusty plasmas and can play an important role in wave dispersion, wave damping and can create instabilities. This is illustrated by the derivation of dispersion relation for dust acoustic modes taking into account the plasma flux balances and plasma flux perturbations by waves. The result of this approach shows that the dust acoustic waves with linear dependence of wave frequency on the wave number exist only in restricted range of the wave numbers. Only for wave numbers larger than some critical wave number for low frequency modes the frequency can be have approximately a linear dependence on wave number and can be called as dust acoustic wave but the phase velocity of these waves is different from that which can be obtained neglecting the flux balance and depends on grain charge variations which are determined by the balance of fluxes. The presence of plasma fluxes previously neglected is the main typical feature of dusty plasmas. The dispersion relation in the range of small wave numbers is found to be mainly determined by the change of the plasma fluxes and is quite different from that of dust acoustic type, namely it is found to have the same form as the well known dispersion relation for the gravitational instability. This result proves in general way the existence of the collective grain attractions of negatively charged grains for for large distances between them and for any source of ionization. The attraction of grains found from dispersion relation of the dust acoustic branch coincides with that found previously for pair grain interactions using some models for the ionization source. For the existing experiments the effective Jeans length for such attraction is estimated to be about 8 , 10 times larger than the ion Debye length and the effective gravitational constant for the grain attraction is estimated to be several orders of magnitude larger than the usual gravitational constant. The grain attraction at large inter-grain distances described by the gravitationlike grain instability is considered as the simplest explanation for observed dust cloud clustering, formation of dust structures including the plasma crystals. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Collective Grain Interactions for Constant Ionization SourceCONTRIBUTIONS TO PLASMA PHYSICS, Issue 4 2006V. Tsytovich Abstract The dust screening and dust attraction in plasmas is considered for the constant ionization source. Both limits of linear and nonlinear screening are considered. It is shown that the non-linear screening changes substantially the collective dust screening and collective dust attraction. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||