Showing papers by "Arizona State University published in 1996"

The robustness of test statistics to nonnormality and specification error in confirmatory factor analysis.

Abstract: Monte Carlo computer simulations were used to investigate the performance of three X 2 test statistics in confirmatory factor analysis (CFA). Normal theory maximum likelihood )~2 (ML), Browne's asymptotic distribution free X 2 (ADF), and the Satorra-Bentler rescaled X 2 (SB) were examined under varying conditions of sample size, model specification, and multivariate distribution. For properly specified models, ML and SB showed no evidence of bias under normal distributions across all sample sizes, whereas ADF was biased at all but the largest sample sizes. ML was increasingly overestimated with increasing nonnormality, but both SB (at all sample sizes) and ADF (only at large sample sizes) showed no evidence of bias. For misspecified models, ML was again inflated with increasing nonnormality, but both SB and ADF were underestimated with increasing nonnormality. It appears that the power of the SB and ADF test statistics to detect a model misspecification is attenuated given nonnormally distributed data.

Services Marketing: Integrating Customer Focus Across the Firm

Abstract: The Second European Edition of Services Marketing: Integrating Customer Focus Across the Firm by Wilson, Zeithaml, Bitner and Gremler uniquely focuses on the development of customer relationships through quality service. Reflecting the increasing importance of the service economy, Services Marketing is the only text that put the customer's experience of services at the centre of its approach. The core theories, concepts and frameworks are retained, and specifically the gaps model, a popular feature of the book. The text moves from the foundations of services marketing before introducing the gaps model and demonstrating its application to services marketing. In the second edition, the book takes on more European and International contexts to reflect the needs of courses, lecturers and students. The second edition builds on the wealth of European and International examples, cases, and research in the first edition, offering more integration of European content. It has also be fully updated with the latest research to ensure that it continues to be seen as the text covering the very latest services marketing thinking. In addition, the cases section has been thoroughly examined and revised to offer a range of new case studies with a European and global focus. The online resources have also been fully revised and updated providing an excellent package of support for lecturers and students.

Supercooled Liquids and Glasses

Abstract: Selected aspects of recent progress in the study of supercooled liquids and glasses are presented in this review. As an introduction for nonspecialists, several basic features of the dynamics and thermodynamics of supercooled liquids and glasses are described. Among these are nonexponential relaxation functions, non-Arrhenius temperature dependences, and the Kauzmann temperature. Various theoretical models which attempt to explain these basic features are presented next. These models are conveniently categorized according to the temperature regimes deemed important by their authors. The major portion of this review is given to a summary of current experimental and computational research. The utility of mode coupling theory is addressed. Evidence is discussed for new relaxation mechanisms and new time and length scales in supercooled liquids. Relaxations in the glassy state and significance of the “boson peak” are also addressed.

CRC Handbook of Combinatorial Designs

Abstract: Balanced Incomplete Block Designs and t-Designs2-(v,k,l) Designs of Small OrderBIBDs with Small Block Sizet-Designs, t = 3Steiner SystemsSymmetric DesignsResolvable and Near Resolvable DesignsLatin Squares, MOLS, and Orthogonal ArraysLatin SquaresMutually Orthogonal Latin Squares (MOLS)Incomplete MOLSOrthogonal Arrays of Index More Than OneOrthogonal Arrays of Strength More Than TwoPairwise Balanced DesignsPBDs and GDDs: The BasicsPBDs: Recursive ConstructionsPBD-ClosurePairwise Balanced Designs as Linear SpacesPBDs and GDDs of Higher IndexPBDs, Frames, and ResolvabilityOther Combinatorial DesignsAssociation SchemesBalanced (Part) Ternary DesignsBalanced Tournament DesignsBhaskar Rao DesignsComplete Mappings and Sequencings of Finite GroupsConfigurationsCostas ArraysCoveringsCycle SystemsDifference FamiliesDifference MatricesDifference Sets: AbelianDifference Sets: NonabelianDifference Triangle SetsDirected DesignsD-Optimal MatricesEmbedding Partial QuasigroupsEquidistant Permutation ArraysFactorial DesignsFrequency SquaresGeneralized QuadranglesGraph Decompositions and DesignsGraphical DesignsHadamard Matrices and DesignsHall Triple SystemsHowell DesignsMaximal Sets of MOLSMendelsohn DesignsThe Oberwolfach ProblemOrdered Designs and Perpendicular ArraysOrthogonal DesignsOrthogonal Main Effect PlansPackingsPartial GeometriesPartially Balanced Incomplete Block DesignsQuasigroupsQuasi-Symmetric Designs(r,l)-DesignsRoom SquaresSelf-Orthogonal Latin Squares (SOLS)SOLS with a Symmetric Orthogonal Mate (SOLSSOM)Sequences with Zero AutocorrelationSkolem SequencesSpherical t-DesignsStartersTrades and Defining Sets(t,m,s)-NetsTuscan Squarest-Wise Balanced DesignsUniformly Resolvable DesignsVector Space DesignsWeighing Matrices and Conference MatricesWhist TournamentsYouden Designs, GeneralizedYouden SquaresApplicationsCodesComputer Science: Selected ApplicationsApplications of Designs to CryptographyDerandomizationOptimality and Efficiency: Comparing Block DesignsGroup TestingScheduling a TournamentWinning the LotteryRelated Mathematics and Computational MethodsFinite Groups and DesignsNumber Theory and Finite FieldsGraphs and MultigraphsFactorizations of GraphsStrongly Regular GraphsTwo-GraphsClassical GeometriesProjective Planes, NondesarguesianComputational Methods in Design TheoryIndex

Preclinical evidence of Alzheimer's disease in persons homozygous for the epsilon 4 allele for apolipoprotein E.

Abstract: Background Variants of the apolipoprotein E allele appear to account for most cases of late-onset Alzheimer's disease, and persons with two copies of the e4 allele appear to have an especially high risk of dementia. Positron-emission tomography (PET) has identified specific regions of the brain in which the rate of glucose metabolism declines progressively in patients with probable Alzheimer's disease. We used PET to investigate whether these same regions of the brain are affected in subjects homozygous for the e4 allele before the onset of cognitive impairment. Methods Apolipoprotein E genotypes were established in 235 volunteers 50 to 65 years of age who reported a family history of probable Alzheimer's disease. Neurologic and psychiatric evaluations, a battery of neuropsychological tests, magnetic resonance imaging, and PET were performed in 11 e4 homozygotes and 22 controls without the e4 allele who were matched for sex, age, and level of education. An automated method was used to generate an aggregat...

The link between green purchasing decisions and measures of environmental consciousness

Abstract: A review of the literature suggests that traditional segmentation variables (socio‐demographics) and personality indicators are of limited use for characterizing the green consumer. Explores the extent to which variables, specific to environmental consciousness, are better able to explain consumers’ pro‐environmental purchasing behaviour. Two conceptualizations of the purchasing domain are addressed, namely general green purchasing behaviour and specific purchasing habits relating to five green product categories. Two data sets are used in the analysis, namely marketing students and members of the United Kingdom general public. Suggests that measures of environmental consciousness are closely linked to environmentally‐responsible purchasing behaviour, although the strength of the relationships varies according to sample type, the conceptualization of the purchasing domain and the particular product category at issue.

Ion-Solid Interactions: Fundamentals and Applications

Abstract: 1. General features and fundamental concepts 2. Interatomic potentials 3. Dynamics of binary elastic collisions 4. Cross-section 5. Ion stopping 6. Ion range and range distribution 7. Radiation damage and spikes 8. Ion-solid simulations and irradiation enhanced transport 9. Sputtering 10. Order-disorder under irradiation and ion implantation metallurgy 11. Ion beam mixing 12. Phase transformations 13. Ion beam assisted deposition 14. Applications of ion beam processing techniques 15. Ion beam system features Appendices: A. Crystallography B. Table of contents C. Density of states D. Derivation of the Thomas-Fermi differential equations E. Centre-of-mass and laboratory scattering angles F. Miedema's semi-empirical model for the enthalpy of formation in the liquid and solid state G. Implantation metallurgy - study of equilibrium alloys.

Construction of Porous Solids from Hydrogen-Bonded Metal Complexes of 1,3,5-Benzenetricarboxylic Acid

Abstract: The reaction of M(II) acetate hydrate (M = Co, Ni, and Zn) with 1,3,5-benzenetricarboxylic (BTC) acid yields a material formulated as M3(BTC)2·12H2O. These compounds are isostructural as revealed by their XRPD patterns and a single crystal structure analysis performed on the cobalt containing solid [monoclinic, space group C2, a = 17.482 (6) A, b = 12.963 (5) A, c = 6.559 (2) A, β = 112.04°, V = 1377.8 (8) A, Z = 4]. This solid is composed of zigzag chains of tetra-aqua cobalt(II) benzenetricarboxylate that are hydrogen-bonded to yield a tightly held 3-D network. Upon liberating 11 water ligands per formula unit a porous solid results, M3(BTC)2·H2O, which was found to reversibly and repeatedly bind water without destruction of the framework. The proposed 1-D channels of the monohydrate have a pore diameter of 4 × 5 A, which is typical of those observed in zeolites and molecular sieves. The successful inclusion of ammonia into the porous solid was demonstrated. Larger molecules and others without a reactiv...

Words and voices: episodic traces in spoken word identification and recognition memory.

Abstract: Most theories of spoken word identification assume that variable speech signals are matched to canonical representations in memory. To achieve this, idiosyncratic voice details are first normalized, allowing direct comparison of the input to the lexicon. This investigation assessed both explicit and implicit memory for spoken words as a function of speakers' voices, delays between study and test, and levels of processing. In 2 experiments, voice attributes of spoken words were clearly retained in memory. Moreover, listeners were sensitive to fine-grained similarity between 1st and 2nd presentations of different-voice words, but only when words were initially encoded at relatively shallow levels of processing. The results suggest that episodic memory traces of spoken words retain the surface details typically considered as noise in perceptual systems.

T-shaped molecular building units in the porous structure of ag(4,4'-bpy).no3

Abstract: and magnetic 4 properties. One of the simplest strategies employed in the production of such 3-D networks is schematically illustrated in Figure 1a,b, where open-framework diamondlike networks have been achieved by the addition copolymerization of either rod-like ligands 5a-c or metal clusters with tetrahedral metal ions. 2c,5d,e In this report, we show how the tendency of silver(I) for linear coordination may be exploited 5f,g

Parents' reactions to children's negative emotions: Relations to children's social competence and comforting behavior.

Abstract: The purpose of this study was to examine the relations of mothers' and fathers' reported emotion-related practices to parents' and teachers' reports of third-to sixth-grade children's social skills, popularity, and coping, as well as the quantity and quality of children's comforting of an infant. Mothers' problem-focused reactions tended to be positively associated with children's social functioning and coping, whereas maternal minimizing reactions tended to be linked to lower levels of social competence and high levels of avoidant coping. There were few findings for fathers' reactions, although fathers reported fewer problem-focused reactions with socially competent, in contrast to less competent, daughters. Emotion-focused and problem-focused maternal reactions, as well as encouragement of the expression of emotion, were associated with boys' children's comforting behavior, although a moderate level of maternal encouragement of the expression of emotion was associated with quality of girls' comforting.

Experimental personality designs: Analyzing categorical by continuous variable interactions.

Abstract: Theories hypothesizing interactions between a categorical and one or more continuous variables are common in personality research. Traditionally, such hypotheses have been tested using nonoptimal adaptations of analysis of variance (ANOVA). This article describes an alternative multiple regression-based approach that has greater power and protects against spurious conclusions concerning the impact of individual predictors on the outcome in the presence of interactions. We discuss the structuring of the regression equation, the selection of a coding system for the categorical variable, and the importance of centering the continuous variable. We present in detail the interpretation of the effects of both individual predictors and their interactions as a function of the coding system selected for the categorical variable. We illustrate two- and three-dimensional graphical displays of the results and present methods for conducting post hoc tests following a significant interaction. The application of multiple regression techniques is illustrated through the analysis of two data sets. We show how multiple regression can produce all of the information provided by traditional but less optimal ANOVA procedures.

A Dispositional and Situational Assessment of Children's Coping: Testing Alternative Models of Coping

Abstract: Dispositional and situational measures of children's coping were developed using a theoretically based approach. Two studies (N1 = 217; N2 = 303) assessed the psychometric characteristics of these measures in fourth- through sixth-grade children. Confirmatory factor analyses indicated that a four-factor model of dispositional coping (active, distraction, avoidant, and support seeking) provided a better fit to the data than either the problem- versus emotion-focused (Lazarus & Folkman, 1984) or passive versus active (Billings & Moos, 1981) coping models. The four-factor model was largely invariant with respect to age and gender. Moderate to high correlations were found between the parallel subscales of the dispositional and situational measures of coping. Although the four factor structures of the dispositional and situational measures were generally similar, factor loadings and correlations between dimensions were not equivalent.

The Transformational and Transactional Leadership of Men and Women

Abstract: Les donnees d'une etude en cours furent rassemblees dans trois conditions d'echantillonnage variees afin d'examiner si des cadres hommes et femmes, observes par leurs evaluateurs directs, avaient le meme style de commandement. L'etude en cours se demarque d'une recherche beaucoup plus ancienne sur les differences entre hommes et femmes en leadership, en ceci que nous y avons examine des differences dans les deux styles de leadership transformationnel et transactionnel, en utilisant le Multifactor Leadership Questionnaire. Dans les trois echantillons, les cadres feminins furent reconnues par des evaluateurs a la fois feminins et masculins comme manifestant des aspects-cles fondamentaux du leadership transformationnel (p. ex. charisme, consideration individualisee) plus frequemment que les hommes. Bien que la taille des echantillons fut generalement petites, les donnees de ces etudes suggerent que les femmes ne sont pas moins transformationnelles que leurs homologues masculins et pourraient en fait l'etre davantage. Le sexe des noteurs n'apparait pas comme influencant les resultats obtenus. Data for the current study were gathered in three diverse sample conditions to examine whether male and female managers differed in styles of leadership observed by their direct reports. The current study differs from most prior research on male-female differences in leadership, in that we examined differences in both transformational and transactional leadership styles using the Multifactor Leadership Questionnaire. In three samples, women leaders were rated by both their female and male direct reports as displaying certain key aspects of transformational leadership (i. e. charisma, individualised consideration) more frequently than men. Although the effect sizes were generally small, the results of these studies suggest that women are no less transformational than their male counterparts, and may, in fact, be more so. The sex of the raters did not appear to make any difference in the results obtained.

The relations of children's dispositional empathy-related responding to their emotionality, regulation, and social functioning.

Abstract: The relations of kindergartners' to 2nd graders' dispositional sympathy to individual differences in emotionality, regulation, and social functioning were examined. Sympathy was assessed with teacher- and self-reports ; contemporaneously and 2 years earlier, parents and teachers reported on children's emotionality, regulation, and social functioning. Social functioning also was assessed with peer evaluations and children's enacted puppet behavior, and negative arousability-personal distress was assessed with physiological responses. In general, sympathy was associated with relatively high levels of regulation, teacher-reported positive emotionality and general emotional intensity, and especially for boys, high social functioning and low levels of negative emotionality, including physiological reactivity to a distress stimulus. Vagal tone was positively related to boys' self-reported sympathy, whereas the pattern was reversed for girls.

The relations of regulation and emotionality to problem behavior in elementary school children.

Abstract: The relations of regulation and emotionality to elementary school children's problem behavior was examined. Parents and teachers reported on children's problem behavior. One parent and teachers rated children on various measures of regulation (including resiliency) and emotionality; children's baseline heart rate and facial reactivity were assessed; and physiological and facial distress and gaze aversion while viewing a distress film sequence were measured. In general, low regulation, negative emotionality, and general and positive emotional intensity predicted problem behaviors. Teachers' reports of negative emotionality and regulation interacted in their relation to problem behaviors, with regulation apparently buffering the effects of moderate and high negative emotionality. Baseline heart rate and facial distress were related to low levels of problem behavior, and gaze aversion during the distress film segment was associated with low levels of problem behavior.

Accuracy of five electronic pedometers for measuring distance walked.

Abstract: This is a three-part study that examined the accuracy of five brands of electronic pedometers (Freestyle Pacer, Eddie Bauer, L.L. Bean, Yamax, and Accusplit) under a variety of different conditions. In Part I, 20 subjects walked a 4.88-km sidewalk course while wearing two devices of the same brand (on the left and right side of the body) for each of five different trials. There were significant differences among pedometers (P < 0.05), with the Yamax, Pacer, and Accusplit approximating the actual distance more closely than the other models. The Yamax pedometers showed close agreement, but the left and right Pacer pedometers differed significantly (P = 0.0003) and the Accusplit displayed a similar trend (P = 0.0657). In Part II, the effects of walking surface on pedometer accuracy were examined. Ten of the original subjects completed an additional five trials around a 400-m rubberized outdoor track. The devices showed similar values for sidewalk and track surfaces. In Part III, the effects of walking speed on pedometer accuracy were examined. Ten different subjects walked on a treadmill at various speeds (54, 67, 80, 94, and 107 m.min-1). Pedometers that displayed both distance and number of steps were examined. The Yamax was more accurate than the Pacer and Eddie Bauer at slow-to-moderate speeds (P < 0.05), though no significant differences were seen at the fastest speed. While there are variations among brands in terms of accuracy, electronic pedometers may prove useful in recording walking activities in free-living populations.

Effects of Groundwater Decline on Riparian Vegetation of Semiarid Regions: The San Pedro, Arizona

Abstract: Groundwater depletion threatens many riparian ecosystems in arid and semi- arid regions of the world. The aquifer that sustains Arizona's San Pedro River riparian ecosystem, for example, is threatened by regional groundwater declines and localized pump- ing from the alluvial aquifer. This paper demonstrates the important role of shallow ground- water in structuring the San Pedro River plant community, portions of which function as reference areas that indicate site potential for a globally rare forest type (Sonoran riparian Populus-Salix forests). Several ecological indicators varied with depth to groundwater, including a weighted average wetland indicator score calculated for herbaceous and woody plant species, cover of plants within wetland indicator groups, and frequency of indicator plant species. These relationships can be used in a space-for-time substitution to predict consequences of groundwater decline. For example, the wetland indicator score changed sharply as depth to groundwater ranged from 0 to 4 m, and abundance of obligate wetland herbs (the group most sensitive to groundwater changes) declined sharply at groundwater depths below -0.25 m. Such sequential "desertification" of the riparian flora (i.e., loss or reduction in cover of species based on their probability of occurrence in wetlands) is one predicted response to groundwater decline. Other predicted impacts of groundwater decline include reduced establishment of Populus fremontii-Salix gooddingii forests, and reduced cover of herbaceous species associated with the fine-textured soils and shady conditions of floodplain terraces stabilized by these early seral tree species. High floodplain terraces (depth to groundwater of 5-8 m) had wetland indicator scores below those of upland sites and were vegetated by species (e.g., Prosopis velutina and Sporobolus wrightii) with low sensitivity to groundwater changes.

Foreign Direct Investment in the United States: An Analysis by Country of Origin

Abstract: Given the large size and rapid growth of foreign direct investment in the United States, this subject is a central concern of U.S. firms and U.S. government policymakers. This study explores the factors that contribute to the explanation of FDI in the United States by country of origin of investment. Evidence from the past twelve years shows that the main significant positive influences are home country's exports to the United States and home country market size. Significant negative influences include the home country's imports from the United States, the cultural and geographic distances of the home country from the United States, and the exchange rate (fx/$).

What do stock splits really signal

Abstract: We observe significant post-split excess returns of 7.93 percent in the first year and 12.15 percent in the first three years for a sample of 1,275 two-for-one stock splits. These excess returns follow an announcement return of 3.38 percent, indicating that the market underreacts to split announcements. The evidence suggests that splits realign prices to a lower trading range, but managers self-select by conditioning the decision to split on expected future performance. Presplit runup and post-split excess returns are inversely related, indi? cating that our results are not caused by momentum.

The natural history of cigarette smoking from adolescence to adulthood: demographic predictors of continuity and change.

Abstract: The current study examined the natural history of smoking from adolescence to adulthood in a community sample. Participants were from a longitudinal study (N = 4,035, 51.7% female, average age = 29 years). Group-level analyses showed a significant increase in smoking from adolescence to young adulthood and a nonsignificant decline after the mid-20s. Individual-level analyses showed that there was appreciable cessation and relapse but little new initiation in adulthood. Both adolescent and young adult smoking status were powerful predictors of adult smoking. Moreover, there was less cessation among less educated individuals and those with smoking parents, and more cessation among those who assumed adult social roles. The findings support the importance of prevention campaigns aimed at adolescent smoking and also suggest that those with lower educational attainment or with a family history of smoking are at heightened risk.

Hubble Space Telescope Observations of the Disk and Jet of HH 30

Abstract: HH 30 in Taurus has been imaged with the Hubble Space Telescope WFPC2. The images show in reflected light a flared disk with a radius of about 250 AU that obscures the protostar. The disk resembles detailed accretion disk models that constrain its density distribution and show that its inclination is less than 10 degrees. There are bipolar emission-line jets perpendicular to the disk, a very clear demonstration of the standard paradigm for accretion disk and jet systems. However, asymmetries in the light distribution show that the disk has not completely settled into a quasi-equilibrium accretion state, or that some of the observed scattering is from an asymmetric envelope. The emission-line jet itself is resolved into a number of knots with typical lengths and separations of 0".4, much smaller and more numerous than indicated by lower resolution ground-based studies. There are indications of still finer structures in the jet all the way to the resolution limit of 0".1. The knots have proper motions ranging from 100 to 300 km s^(-1) and are therefore generated at the surprisingly high rate of about 0.4 knots per jet per year. The jet appears to be collimated within a cone of opening angle 3o and can be seen to within 30 AU of the star. Both single- and multiple-scattering disk models have a range of possible solutions, but by requiring pressure support and temperature equilibrium, a self-consistent model emerges. There is evidence for pressure support because the disk appears to have a Gaussian height profile. The temperature at each point in the disk is determined by the disk geometry, which in turn fixes the temperature in a self-consistent manner. The extinction to the protostar is unknown but constrained to be greater than 24 mag. The optical properties of the scattering grains in the disk are determined and found to imply a large scattering asymmetry, but they seem to follow the interstellar reddening law. The absolute magnitude and colors of the unseen protostar, which has a brightness in the I bandpass of about 0.16 times solar and is very red, are obtained. The disk mass is about 0.006 times solar and has an expected lifetime of about 10^5 yr.

A magnetically driven oscillating probe microscope for operation in liquids

Abstract: Oscillating probe atomic force microscopy in fluids is simplified when an oscillating force is applied directly to a magnetized cantilever using a solenoid. The response of the detector is simpler than that obtained with acoustic excitation. Reliable operation over a broad frequency range is achieved with excitation amplitudes of a few nm. This lower amplitude appears to facilitate imaging by means of small asperities on the tip. Images of a DNA plasmid bound weakly to mica in water have a full width of 5 nm when scanned with tips of a nominal macroscopic radius of curvature of 50 nm.

A 3.5-Gyr-old galaxy at redshift 1.55

Abstract: ONE of the most direct methods of constraining the epoch at which the first galaxies formed—and thereby to constrain the age of the Universe—is to identify and date the oldest galaxies at high redshift. But most distant galaxies have been identified on the basis of their abnormal brightness in some spectral region1–4; such selection criteria are biased towards objects with pronounced nuclear activity or young star-forming systems, in which the spectral signature of older stellar populations will be concealed. Here we report the discovery of a weak and extremely red radio galaxy (53W091) at z = 1.55, and present spectroscopic evidence that its red colour results from a population of old stars. Comparing our spectral data with models of the evolution of stellar populations, we estimate that we are observing this galaxy at least 3.5 Gyr after star-formation activity ceased. This implies an extremely high formation redshift (z > 4) for 53W091 and, by inference, other elliptical galaxies. Moreover, the age of 53W091 is greater than the predicted age of the Universe at z = 1.55, under the assumption of a standard Einstein–de Sitter cosmology (for any Hubble constant greater than 50kms−1 Mpc−1), indicating that this cosmological model can be formally excluded.

Family, peer, and neighborhood influences on academic achievement among African-American adolescents: one-year prospective effects

Abstract: Using a 1-year prospective design, this study examined the influence of family status variables (family income, parental education, family structure), parenting variables (maternal support and restrictive control), peer support, and neighborhood risk on the school performance of 120 African American junior high school students. In addition to main effects of these variables, neighborhood risk was examined as a moderator of the effects of parenting and peer support. Family status variables were not predictive of adolescent school performance as indexed by self-reported grade point average. Maternal support at Time 1 was prospectively related to adolescent grades at Time 2. Neighborhood risk was related to lower grades, while peer support predicted better grades in the prospective analyses. Neighborhood risk also moderated the effects of maternal restrictive control and peer support on adolescent grades in prospective analyses. These findings highlight the importance of an ecological approach to the problem of academic underachievement within the African American community.