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In this work, we define the Pell-Jacobsthal-Slyvester sequence and the Jacobsthal-Pell-Slyvester sequence by using the Slyvester matrices which are obtained from the characteristic polynomials of the Pell and Jacobsthal sequences and then, we study the sequences defined modulo m . Also, we obtain the cyclic groups and the semigroups from the generating matrices of these sequences when read modulo m and then, we derive the relationships among the orders of the cyclic groups and the periods of the sequences. Furthermore, we redefine Pell-Jacobsthal-Slyvester sequence and the Jacobsthal-Pell-Slyvester sequence by means of the elements of the groups and then, we examine them in the finite groups. [ABSTRACT FROM AUTHOR]

In this work, we define the Padovan-Pell-Slyvester sequences of the first and second kind by using the Slyvester matrices which are obtained from the characteristic polynomials of the Padovan and Pell-Padovan sequences. First we study the Padovan-Pell-Slyvester sequences of the first and second kind modulo m and we obtain the cyclic groups from the Slyvester matrices when read modulo m . Then we derive the relationships among the orders of the cyclic groups and the periods of the sequences. Finally, we extend Padovan-Pell-Slyvester sequences of the first and second kind to groups and then we study these sequences in finite groups. [ABSTRACT FROM AUTHOR]

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In almost five years from 2010 to 2014, which belongs to the cross-Olympic period in China's competitive sport process, as well as the adaptation period for table tannis going into the inorganic era, especially after the baptism of the London Olympics, we come up with this question that how does inorganic glue make changes to table tennis? Through a comparative study on the technical and tactical development characteristics of male table tennis during 5 years of adaptation of the inorganic era from 2010 to 2014, an in-depth analysis on the similarity and difference between overall and individual characteristics will be made in this paper, in order to make reference for the corresponding countermeasure that how to cope with the further changes of new material brought to table tennis. Conclusions of this research will be as follows: The overall development of competitive level is complementary and relatively stable. Tactical level of attacking serve is in a good range, and will have more space to make improvement. Tactical level of receiving serve is the most prominent characteristic, and actually there is no significant difference between the two styles, which can be further improved through threestage of diagnostic tools. However, the stalemate playing is still relatively weak and should be strengthened as soon as possible. [ABSTRACT FROM AUTHOR]

In the Romanian literature, as well as in the world literature, one can see indications of existing concerns of that era. They relate to fashion, customs, but also to readings or literary concerns. Thus can be measured the high or low level of education and the psychological involvement of the author. It is the case of the characters in the work of Camil Petrescu, Romanian interwar writer (1894-1957), promoter of authenticity, as a policy of his novel. The present research sets sight on the characters from the two subjective novels: Ultima noapte de dragoste (Last Night of Love) - 1930 and Patul lui Procust (The Procrustes Bed) - 1933, by means of text study or comparative study, obtaining an axis of the ways of expression. The technique of the two intersecting plans, as Camil Petrescu calls the crossroads of plans, can be found in his novel, as well as in the present research. Leaving behind an entire ethical tradition of authenticity, from Montaigne to Balzac, Camil Petrescu practices synchronization with the sciences of his time and states that the literature of an era is correlated with the psychology of that era. The problems of the authors pass on the shoulders of the characters; they become offerings, but in honour of their names the book will live. Camil Petrescu commissions his characters to report in writing the existential experience, assuming in this way the writing in the first person. Self-knowledge can take place only within the limits of writing, which may be unlimited or limited, as much as the author allows it. In conclusion, the present study demonstrates that Camil Petrescu starts form the Proustian model in elaborating his novels, but builds his characters according to his intellectual, psychological needs. The characters are genuine and assume the author's concerns, becoming writer characters. [ABSTRACT FROM AUTHOR]

This paper deals with a method for the estimation of the signal cyclic component's period using an autoregressive model. The properties of the method are explored and quantified in the case of its application to short sample size signals. A number of computer experiments has been performed using the harmonic signal corrupted by noise and the autoregressive model of the second order. The results of the experiments are represented in the graphical form. It could be noticed that the mean value of the errors could result to significant values while the variance of the error is generally almost negligible. [ABSTRACT FROM PUBLISHER]

In this present paper, we give results that a decrease of the control parameter in the logistic map over integers causes to disappear several loops which have specified periods. We derive the theoretical lower bound of the control parameter for a potential of existing the loop with an odd period on the logistic map over integers. [ABSTRACT FROM PUBLISHER]

Homework on the moment of inertia of a human arm was set to the first-year students in a dynamics class in a university. In this homework students must measure the sizes of several parts of their arm and calculate the moment of inertia of the arm and so on. They are requested to measure the period of swinging arm motion and compare it with that of calculated value in the case that it is assumed as a rigid body pendulum. The impressions of the students to the homework and the effects of the homework to the students were also examined. [ABSTRACT FROM AUTHOR]

The equation for the orbit of the Lotka-Volterra system is approximately solved for one of two variables in terms of the other by using the Pade approximant of order (2, 2) for the function ex-x-1. The approximate formulas are found to describe the time behavior of the solutions. A comparison with numerical calculations is demonstrated. [ABSTRACT FROM AUTHOR]

This paper employs a uniquely long running survey series, the British Social Attitudes surveys, to examine white British attitudes towards two forms of social contact with two ethnic minorities - having a black or Asian boss and having a close relative marry someone black or Asian - over a 13 year time period from 1983 to 1996. Period, cohort and individual level effects are identified. Hostility towards contact with minorities has declined steeply over the period considered, particularly in the 1990's. The attitudes are structured by generation, with older generations very much more hostile to both forms of social contact with minorities. This generational structure in attitudes has persisted despite a decline in hostility towards social contact among all cohorts. Those possessing degrees are found to be less hostile, an effect which increases for younger generations. The decline in hostility seems closely correlated to the increase in the ethnic minority population, suggesting white attitudes have become more accommodating as Britain has diversified. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]

It is well known that the identification problem created by the exact linear dependency of age (A), period (P), and cohort (C) presents a major challenge to conventional APC analyses. Previous solutions to this problem have limited utilities because they impose constraints on the parameters and are confined to population level data so it is difficult to include other explanatory covariates. This study develops a new approach, namely, Hierarchical APC models (HAPC), to age-period-cohort analysis of micro datasets in the form of a series of repeated cross-section sample surveys. First, it outlines the advantages and flexibilities of HAPC to estimate separate age, period, and cohort effects. Second, it substantively illustrates the application of two-level fixed-random mixed effects models to a nationally representative sample survey, the General Social Survey, on intellectual skills in U.S. from 1974 to 2000. It examines the potential problem of small level-2 sample size and unbalanced data to statistical inferences using the usual REML-EB estimation through Monte Carlo simulations. Third, a full Bayesian analysis using Gibbs sampler and MCMC estimation is conducted to account for the extra uncertainty unadjusted by REML-EB estimates. Results are compared with REML estimates. Sensitivity analysis of different priors is also considered. Preliminary findings based on REML-EB estimates suggest interesting temporal patterns of vocabulary changes in U.S. for the past few decades across all ages and birth cohorts. The final results may shed light on the debates in sociological literature on the same data as to whether or not there exists an intercohort decline in verbal test scores. [ABSTRACT FROM AUTHOR]

This paper starts from the theoretical position that social relations and material conditions, as well as ideas, construct gender. Recognizing that parenthood is likely at the heart of gender inequality in heterosexual families, I examine the parenting practices heterosexual couples develop in the early postpartum period. Specifically, I look at the extent to which women do ?intensive mothering? and how involved men are in baby care. The study that provides the basis of the paper involves in-depth interviews with 40 couples as they move from pregnancy through their first year of parenthood. I argue that social class, especially labor-market success or failure, affects the likelihood that women will do intensive mothering and the extent of men?s involvement in baby care. The impact of the labor market was felt by women in obvious and subtle ways. Among the latter were differences in women?s relationship to time ? whether they felt they owned time and could spend it (on baby care), or that they had to use it (more) productively. Men?s ?consent? to intensive mothering was more likely to come from men who were involved in baby care, and their involvement was limited by ?hidden injuries of class.? [ABSTRACT FROM AUTHOR]

Machinists built networked communities from 1790 to 1860 in the pivotal producer durables (metal fabricating, machinery, and machine tools). The key sectors included iron foundries, steam engines, textile machinery, locomotives, firearms, and machine tools. For at least three to four decades after 1860, machine tools, for the most part, remained as a business line and set of skills within firms, not as separate firms. Technological information and skills were embedded in networks of machinists, firms, and clusters (individuals or firms)?information and skills were not the sole property of the components. And, the machinists constituted communities-of-practitioners which became the repository of skills, information, and knowledge, and these communities were dynamic in that they were open to, and promoted, technological change. At the same time, the failure of machinists and their firms to actively participate in these networks and the communities condemned individuals and companies to an uncompetitive status. The networked behavior of machinists and their communities-of-practice contributed to the material transformation of the pivotal producer durables by the 1850s. [ABSTRACT FROM AUTHOR]

Conventional models for the analysis of age, period, and cohort (APC) effects focus on data in the form of tables of percentages or occurrence/exposure rates of events such as births, deaths, disease incidence, crimes, etc. In this context, it is well known that the identification problem created by the linear dependency of age, period and cohort (Period = Age + Cohort) presents a major methodological challenge to statistical models for APC analysis. Increasingly, however, micro datasets in the form of series of repeated cross-section sample surveys are available to sociologists. Standard regression models do not take into account the possibility that individuals clustered in the same survey year or cohort group may be similar in their response or dependent variables because random errors unique to each survey year or cohort are common to every survey respondent in those years or cohorts. This paper argues that multilevel modeling is appropriate for making use of the rich array of information on a variety of individual measures available in repeated cross-section surveys and for distilling out the effects of the clustering of survey respondents by survey year or cohort. As a substantive illustration, we apply HLM-APC models to data on verbal test scores from 15 cross-sections of the General Social Survey, 1974-2000. These data have been the subject of recent debates in the sociological literature. We show how the multi-level models approach helps to settle these debates by identifying and estimating the separate age, period, and cohort components of change. [ABSTRACT FROM AUTHOR]

Various theories have been offered to explain political participation rates among black Americans since ratification of the Voting Rights Act in 1965. The VRA is thought to be an indication of high political empowerment among blacks. Therefore it provides an opportunity to explore age, period, and cohort effects in the consequences of empowerment on long-term voting behavior. Using a series of logistic regression equations on data from the National Election Study, this paper analyzes rates of voter turnout in the 1968-1996 presidential elections among both blacks and whites. We find that there is mixed support for theories of racial differences in political participation. Much of the racial gap in voter turnout can be attributed to differences in socioeconomic characteristics between blacks and whites. Moreover, while age is an important determinant of voting among whites, period is a better determinant of turnout among blacks. Additionally, while there is very limited support for theories of cohort differences among blacks, cohort has no observable effect on voting behavior among whites. [ABSTRACT FROM AUTHOR]

This paper makes the case that mechanistic statistical approaches cannot, by themselves, decipher the APC puzzle, though their usefulness as tools per se is not questioned. Rather, I plea that theory be brought in to understand the generative processes of the data (sometimes called mechanisms). I use as an illustrative example the largest demographic event of the preceding century, the 1918-19 "Spanish" influenza pandemic. [ABSTRACT FROM AUTHOR]

Summary form only given. Computational and experimental studies of a tunable-amplitude microwiggler structure with a period of 1 cm which has produced on-axis fields exceeding 4.6 kG were performed. An order of magnitude reduction in random field errors, to 0.4% RMS, produced by amplitude tuning was demonstrated as compared to the untuned field profile. High-precision adiabatic up-taper field profiles were also obtained. Experimental saturation studies of the microwiggler were compared to computational models, linear B/H operation to 3.2 kG was observed. Preliminary experimental results demonstrating tunable transverse-plane focusing fields were obtained. An FEL experiment driven by a 450-kV Marx accelerator and a SLAC-style Pierce thermionic gun was proposed [ABSTRACT FROM PUBLISHER]

Summary form only given, as follows. A free electron laser (FEL) has been operated as an amplifier at 35 GHz. The strong axial guide magnetic field (12 kG) places the electrons into the so-called group II orbits. In the regime of interest the expected efficiency is high because the space charge wave is unstable. The mildly relativistic beam (1 MeV) is generated by a Marx capacitor bank. The field-emission cathode yields about 360 A, with a beam radius of 2.54 mm. The bifilar helical wiggler has a period of 3.18 cm and provides a magnetic field of 1 kG. The FEL amplifies the TE11 mode in a circular wave-guide with a radius of 5.1 mm. The high-efficiency below-grazing regime, in which the beam resonance line falls slightly below the vacuum waveguide dispersion curve, is being investigated. Preliminary data show a gain of 30 dB/m. About 13 kW has been injected from a magnetron and an output of about 20 MW has been obtained, corresponding to an efficiency of approximately 6% [ABSTRACT FROM PUBLISHER]