cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Parameter estimation for progressive censored data under accelerated life test with 𝒌 levels of constant stress
Creators: name: Kamal, Mustafa
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Simulation
type-II progressive censoring
multiple constant stress accelerated life test

description: Accelerated life testing (ALT) is a time-saving technique that has been used in a variety of sectors to get failure time data for test units in a relatively short time it takes to test them under regular operating circumstances. One of the primary goals of ALT is to estimate failure time functions and reliability under typical use. In this article, an ALT with k increasing stress levels that is stopped by a type II progressive censoring (TIIPC) scheme is considered. At each stress level, it is assumed that the failure times of test units follow a generalized Pareto (GnP) distribution. The link between the life characteristic and stress level is considered to be log-linear. The maximum likelihood estimation (MLE) method is used to obtain inferences about unknown parameters of the model. Furthermore, the asymptotic confidence intervals (ACIs) are obtained by utilizing the inverse of the fisher information matrix. Finally, a simulation exercise is presented to show how well the developed inferential approaches performed. The performance of MLEs is assessed in terms of relative mean square error (RMSE) and relative absolute bias (RAB), whereas the performance of ACIs is assessed in terms of their length and coverage probability (CP).
Signals of Inflationary Models with Cosmic Strings
Creators: name: Hindmarsh, Mark
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A class of well-motivated models of inflation end by producing cosmic strings. The current status of efforts to calculate and observe the signals from such models are outlined, with a particular emphasis on cosmic strings, and on the Cosmic Microwave Background signal.
description: 32pp, 12 figs, proceedings YKIS2010 symposium "Cosmology - The Next Generation" 28/6 - 2/7/2010, to appear in Progress of Theoretical Physics
Charge-breeding studies for high-precision mass measurements on short-lived nuclides at TITAN and a direct determination of the 51Cr electron-capture Q-value for neutrino physics
Creators: name: Macdonald, Tegan Danielle
Publisher: name: University of British Columbia
Year: 2014

description: Penning-trap mass spectrometry (PTMS) is a well-established technique for performing high-precision mass measurements on both stable and short-lived nuclides. Achieving high precisions with radioactive isotopes is technically challenging due to the limited yields and inherent losses from radioactive decay, but it is a worthwhile pursuit as the mass is a fundamental property unique to each nuclide. Accurate and precise knowledge of the mass plays a critical role in the advancement of both theories and applications of nuclear and particle physics. This work provides the result of a Q-value (mass difference) measurement of the ⁵¹Cr(e,𝜈e)⁵¹V reaction. This first direct Q-value measurement confirmed the neutrino energies that were used in calculations for the solar neutrino experiments SAGE and GALLEX and the so-called gallium. Charge breeding to increase the precision of a PTMS measurement on radioactive ions is a technique that is unique to the TITAN (TRIUMF’s Ion Trap for Atomic and Nuclear science) facility; however, this potential increase in precision can be diminished by inefficiencies that are introduced by charge breeding. This thesis describes the simulations and systematic studies that are used to quantify the precision gained in a PTMS measurement made with highly charged, radioactive ions. This novel approach has allowed for the identification of key charge-breeding parameters and the determination of the optimal charge-breeding conditions based solely on the nuclide of interest and its half-life. Furthermore, experimental investigations were performed to determine the compatibility between the simulated findings and experimental observations. These investigations have led to a deeper understanding of the charge-breeding process and apparatus and will improve the predictability and performance of charge breeding at TITAN.
Automated Spam Email Identification Using Data Visualization and Machine Learning Techniques
Creators: name: Aksa Abi Abraham, Diana Reeba Benjamin, Nilachandana T S
Publisher: name: Zenodo
Year: 2025

description: Spam emails are a critical cyber challenge as they contribute to loss of productivity and security breaches.In this paper, we introduce an Artificial Neural Network (ANN)-based spam classifier using visualizationmethods for enhanced explainability. We use the SpamAssassin datasets for preprocessing the text data,TF-IDF feature extraction, and training an ANN classifier. Our model has an accuracy of 99.91%, alongwith a near-optimal F1-score of 1.00. In addition, we present visualization methods like a confusion matrixheatmap and graphs to facilitate better user comprehension of the performance of classification. Thefindings show the possibility of ANN-based classifiers integrated with visualization methods for enhancedspam filtering. Future research will explore integrating transformer-based models like BERT for improvedspam classification accuracy.
Performance Analysis of the Water Treatment Reverse Osmosis Plant
Creators: name: Agrawal, Amrita
name: Garg, Deepika
name: Kumar, Arun
name: Kumar, Rakesh
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Regenerative Point Graphical Technique
Profit Analysis
Availability
Water Treatment Reverse Osmosis (RO) Plant

description: In this research paper, profit analysis of a Water Treatment Reverse Osmosis (RO) Plant is carried out by using the Regenerative Point Graphical Technique (RPGT) under specific conditions for system parameters. The paper analyzes the behavior of a water treatment RO plant consisting of subunits namely Multimedia filter (MMF), Cartridge filter (CF), High-pressure pump (HPP), RO System (ROS). The system is in a working state when all subunits are in good condition. A repair facility is accessible for all subunits. Availability of the plant, Busy Period of the Server (BPS) and Expected number of inspection by the repairman (ENIR) is calculated by using the RPGT technique. Finally, numerical analysis is carried out for calculating the performance measures and their comparisons.
Options for the Neutron Lifetime Measurements in Traps
Creators: name: Pokotilovski, Yu. N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Different geometries for the neutron lifetime measurements by the method of ultracold neutron storage in material traps and additional possibilities for the neutron storage in the magnetic storage ring are considered.
description: 21 p., 11 figures
Structure-based evaluation of the envelope domain III–nonstructural protein 1 (EDIII-NS1) fusion as a dengue virus vaccine candidate
Creators: name: Shoushtari, Mohammad
name: Rismani, Elham
name: Salehi-Vaziri, Mostafa
name: Azadmanesh, Kayhan
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology

description: The lack of effective medicines or vaccines, combined with climate change and other environmental factors, annually subjects a significant proportion of the world’s inhabitants to the risk of dengue virus (DENV) infection. These conditions increase the likelihood of exposure to mosquito-borne diseases such as dengue fever. Hence, many research approaches tend to develop efficient vaccine candidates against the dengue virus. Therefore, we used immunoinformatics and bioinformatics to design a construction for developing a candidate vaccine against dengue virus serotypes. In this study, the in silico structure, containing the non-structural protein 1 region (NS1) (consensus and epitope), the envelope domain III protein (EDIII) as the structural part of the virus construction, and the bc-loop of envelope domain II (EDII) as the neutralizing and protected epitope, were employed. We utilized in silico tools to enhance the immunogenicity and effectiveness of dengue virus vaccine candidates. Evaluations included refining and validating physicochemical characteristics, B and T-cell epitopes, homology modeling, and the three-dimensional structure to assess the designed vaccine’s quality. In silico results for tertiary structure prediction and validation revealed high-quality modeling for all vaccine constructs. Additionally, the instructed model demonstrated stability throughout molecular dynamics simulation. The results of the immune simulation suggested that the titers of IgG and IgM could be raised to desirable values following injection into in vivo models. It can be concluded that the designed construct effectively induce humoral and cellular immunity and can be proposed as effective vaccine candidate against four dengue serotypes. Communicated by Ramaswamy H. Sarma
Temporal and Spatial Independent Component Analysis for fMRI data sets embedded in a R package
Creators: name: Bordier, Cécile
name: Dojat, Michel
name: de Micheaux, Pierre Lafaye
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computation (stat.CO)
subject: Medical Physics (physics.med-ph)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: For statistical analysis of functional Magnetic Resonance Imaging (fMRI) data sets, we propose a data-driven approach based on Independent Component Analysis (ICA) implemented in a new version of the AnalyzeFMRI R package. For fMRI data sets, spatial dimension being much greater than temporal dimension, spatial ICA is the tractable approach generally proposed. However, for some neuroscientific applications, temporal independence of source signals can be assumed and temporal ICA becomes then an attracting exploratory technique. In this work, we use a classical linear algebra result ensuring the tractability of temporal ICA. We report several experiments on synthetic data and real MRI data sets that demonstrate the potential interest of our R package.
description: Submitted to JSS
Synchrotron x-ray study of lattice vibrations in CdCr2O4
Creators: name: Kim, J. -H.
name: Matsuda, M.
name: Ueda, H.
name: Ueda, Y.
name: Chung, J. -H.
name: Tsutsui, S.
name: Baron, A.
name: Lee, S. -H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using inelastic x-ray scattering we have investigated lattice vibrations in a geometric frustrated system CdCr2O4 that upon cooling undergoes a spin-Peierls phase transition at TN = 7.8 K from a cubic and paramagnetic to a tetragonal and Neel state. Phonon modes measured around Brillouin zone boundaries show energy shifts when the transition occurs. Our analysis shows that the shifting can be understood as the ordinary effects of the lowering of the crystal symmetry.
Performance Evaluation of a Complex Reverse Osmosis Machine System in Water Purification using Reliability, Availability, Maintainability and Dependability Analysis
Creators: name: Maihulla, Anas Sani
name: Yusuf, Ibrahim
name: Saminu I. Bala
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Reverse osmosis
reliability
failure rate
repair rate

description: Today, reverse osmosis (RO) is a critical technique in the production of fresh water all over the world. As a result, downtimes due to repairing operations (after breakdowns, membrane blockage, pressure losses, etc.) or preventative maintenance (cleaning of membranes, component replacements, etc.) must be kept to a minimum in duration and frequency to guarantee optimum availability. Indeed, enhancing the availability (or dependability) of the RO plant as a whole system leads to a significant decrease in operating and maintenance expenses. We look at a recursive technique for reliability, availability, maintainability, and dependability in this study (RAMD. In addition, the efficacy of a RO unit, mean time to failure (MTTF), mean time to repair (MTTR), and dependability ratio were evaluated. The primary goal is economic optimization. For the method's validation, we utilized data from a RO unit that had a repair rate and a failure rate during a one-year period. It was demonstrated that all subsystems (pretreatment, dosage, etc.) had high availability. The high-pressure pump has a somewhat lower availability. For example, 0.59113 was the lowest availability for all subsystems, and it is for the RO membrane, which is where the majority of the purifications take place. A sensitivity analysis was performed to identify the essential components for the RO plant's availability. The collected findings demonstrate that the availability, reliability, dependability, and maintainability of the high-pressure pump have a significant impact on the overall system availability. As a result, special care should be given in the selection and maintenance of the high-pressure pump.
Some remarks on a current study involving preservice elementary teachers and some basic astronomical phenomena
Creators: name: Gangui, Alejandro
name: Iglesias, Maria
name: Quinteros, Cynthia
Publisher: name: arXiv
Year: 2010
Subjects: subject: Physics Education (physics.ed-ph)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Recent studies have shown that not only primary school students but also their future teachers reach science courses with pre-constructed and consistent models of the world surrounding them. These ideas include many misconceptions which turn out to be robust and hence make difficult an appropriate teaching-learning process. We have designed some tools that proved helpful in putting in evidence some of the most frequently used alternative models on a few basic astronomical notions. We have tested these tools with preservice elementary teachers from various normal schools in Buenos Aires and made a first analysis of the results. The collection of data recovered so far shows that some non-scientific conceptions are indeed part of the prospective teachers' (scientific) background and that, therefore, the issue deserves special attention during their formal training.
description: to appear in The Role of Astronomy in Society and Culture: Proceedings of the IAU Symposium 260, D. Valls-Gabaud and A. Boksenberg (eds), Cambridge: Cambridge University Press, IAU Symposia Series
Reliability, Availability, Maintainability, and Dependability (RAMD) Analysis of Computer Based Test (CBT) Network System
Creators: name: Abdullahi Sanusi
name: Yusuf, Ibrahim
name: Na’Fiu Hussain
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Reliability
availability
maintainability
dependability
Subsystem/component
Computer Based Test (CBT)

description: Computer Based Test System also known as an e-examinations system, is software that can be used to administer examinations for distant or in-house applicants via internet or in an internet. Computer Based Test System/Software comprises of many components. So, it is vital to ensure its smooth operation, which can be achieved by the proper operation of its components/subcomponents. It is necessary to improve components/subcomponents operational availability. For this reason, the present research proposes to explore Computer Based Test System reliability indices using a RAMD technique at the component/subcomponent level. As a result, all subsystem/component transition diagrams are constructed, and the Chapman-Kolmogorov differential equations are formulated using the Markov birth-death process. For various subsystems/components of the system, numerical findings for reliability, availability, maintainability, and dependability, all of which are crucial to system performance, have been obtained and given in tables and figures. Other measurements, such as MTTF, MTBF, dependability ratio, and dependability minimum have also been obtained. Based on the numerical results, the most significant subsystem/component has been determined and the significance of the research has been emphasized.
Dark Matter in SuperGUT Unification Models
Creators: name: Olive, Keith A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: After a brief update on the prospects for dark matter in the constrained version of the MSSM (CMSSM) and its differences with models based on minimal supergravity (mSUGRA), I will consider the effects of unifying the supersymmetry-breaking parameters at a scale above M_{GUT}. One of the consequences of superGUT unification, is the ability to take vanishing scalar masses at the unification scale with a neutralino LSP dark matter candidate. This allows one to resurrect no-scale supergravity as a viable phenomenological model.
description: 12 pages, 16 figures, To be published in the Proceedings of the 6th DSU Conference, Leon, Mexico, ed. D. Delepine
Target characterization for the 130Ba(alpha,gamma)134Ce gamma-process experiment
Creators: name: Gyürky, Gy.
name: Halász, Z.
name: Farkas, J.
name: Fülöp, Zs.
name: Somorjai, E.
name: Szücs, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In order to extend the available experimental database for the astrophysical gamma-process, the cross section measurement of the 130Ba(alpha,gamma)134Ce and 130Ba(alpha,n)133Ce reactions is in progress. The measurements are carried out using thin layers of evaporated BaCO3 as target. Since the target thickness enters directly into the calculation of the cross sections, the reliability of its determination is of crucial importance. Three different methods have been used to determine the target thickness. Details of these experiments and the obtained results are presented.
description: Published in the proceedings of the 11th Symposium on Nuclei in the Cosmos, Proceedings of Science
Thin-film growth by random deposition of rod-like particles on a square lattice
Creators: name: Forgerini, F. L.
name: Figueiredo, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Monte Carlo simulations are employed to investigate the surface growth generated by deposition of particles of different sizes on a substrate, in one and two dimensions. The particles have a linear form, and occupy an integer number of cells of the lattice. The results of our simulations have shown that the roughness evolves in time following three different behaviors. The roughness in the initial times behaves as in the random deposition model, with an exponent $β_{1} \approx 1/2$. At intermediate times, the surface roughness depends on the system dimensionality and, finally, at long times, it enters into the saturation regime, which is described by the roughness exponent $α$. The scaling exponents of the model are the same as those predicted by the Villain-Lai-Das Sarma equation for deposition in one dimension. For the deposition in two dimensions, we show that the interface width in the second regime presents an unusual behavior, described by a growing exponent $β_{2}$, which depends on the size of the particles added to the substrate. If the linear size of the particle is two, we found that $β_{2}β_{1}$, for all particles sizes larger than three. While in one dimension the scaling exponents are the same as those predicted by the Villain-Lai-Das Sarma equation, in two dimensions, the growth exponents are nonuniversal.
description: 9 pages, 4 figures. To appear in PSS
Reliability Optimization Using Heuristic Algorithm In Pharmaceutical Plant
Creators: name: Dahiya, Tripti
name: Garg, Deepika
name: Devi, Sarita
name: Kumar, Rakesh
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: redundancy
optimization
heuristic method
system reliability

description: In this paper, reliability of the liquid medicine manufacturing system of pharmaceutical plant named as Yaris Pharmaceuticals is enhanced on solving a redundancy allocation problem with the help of three algorithms HASL1 (Heuristic algorithm with selection factor 1), HASL2 (Heuristic Algorithm with Selection factor 2) and HASL3 (Heuristic Algorithm with Selection factor 3). It is ensured that redundancy is allocated within given cost constraints to maximize system reliability. Post allocation of redundancy the results of these algorithms are analyzed with the help of graphs, it has been found that the reliability of the system is optimized.
A kind of infinite-dimensional Novikov algebras and its realization
Creators: name: Chen, Liangyun
name: Ma, Yao
name: Yu, Haijun
Publisher: name: arXiv
Year: 2011
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: F.2.2
subject: 17A30

description: In this paper, we construct a kind of infinite-dimensional Novikov algebras and give its realization by hyperbolic sine functions and hyperbolic cosine functions.
description: 9
Классификация правозащитных целей
Creators: name: Александр Алексеевич Стремоухов
Publisher: name: Вестник Московского университета МВД России
Year: 2018
Subjects: цель
цель в праве
цель права
правовая цель
правозащитная цель
классификация
эффективность правовой нормы.
aim
aim in the law
aim of the law
legal aim
classification
legal norms efficiency.

description: Предлагается классификация правовых целей в области правовой защиты человека. Изучение правозащитных целей имеет огромное значение; оно позволяет максимально полно установить степень эффективности законотворчества и правоприменения в сфере правовой защиты человека. Перед представлением классификации автор дает определение понятия «правовая цель».
description: Article provides a classification of the legal aims in the field of the legal protection of the individual. The study of the aims of the human rights protection is of paramount importance. It allows to fully examine the efficiency of human rights legislation and law enforcement. Before providing the classification the author defines the notions related to the concept of the «legal aim».
Reliability Test Plan For The Marshall-Olkin Extended Inverted Kumaraswamy Distribution
Creators: name: Jiju Gillariose
name: Ehab M. Almetwally
name: Joshin Joseph
name: Vishna Devi
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Reliability Test Plan
Kumaraswamy Distribution
Marshall-Olkin Family
Method of Maximum Likelihood
Method of Percentiles

description: This paper mainly interested in studying the wider range behavior of the Marshall-Olkin extended inverted Kumaraswamy distribution. The parameters of model are estimated by various estimation methods. A reliability sampling plan is proposed which can save the test time in practical situations. Some tables are also provided for the new sampling plans so that this method can be used conveniently by practitioners. The developed test plan is applied to ordered failure times of software release to provide its importance in industrial applications.
The Lagrange Equilibrium Points L_4 and L_5 in a Black Hole Binary System
Creators: name: Schnittman, Jeremy D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We calculate the location and stability of the L_4 and L_5 Lagrange equilibrium points in the circular restricted three-body problem as the binary system evolves via gravitational radiation losses. Relative to the purely Newtonian case, we find that the L_4 equilibrium point moves towards the secondary mass and becomes slightly less stable, while the L_5 point moves away from the secondary and gains in stability. We discuss a number of astrophysical applications of these results, in particular as a mechanism for producing electromagnetic counterparts to gravitational-wave signals.
description: 10 pages, 4 figures, submitted to ApJ; comments welcome
Review of Performance Factors of Emotional Speaker Recognition System: Features, Feature Extraction Approaches and Databases
Creators: name: Das, Satish Kumar
name: Uttpal Bhattacharjee
name: Mandal, Amit Kumar
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: speech emotion recognition
features
feature extraction approaches
databases

description: Emotion is a conscious mental reaction accompanied by physiological and behavior changes in human body.In speaker authentication system, emotional state of the speaker plays a vital role. Recently, the field of speaker recognition in emotional context attracts more and more attention of many research focuses. However, to implement more realistic and intelligent emotional speaker recognition system it is interesting to study this system under real life conditions. Speech emotion recognition is a system in which speech signals are processed to classify the embedded emotions. In recent past, speaker emotion recognition has gained a lot of attention from different researchers as it has many applications. In this regards, study of prior works is useful for further research in the field of speaker verification in emotional context. So, performance and reliability of Emotional Speaker Recognition System depend on the proper selection of features to characterize different emotional states, feature extraction approaches and databases. In this paper we briefly discuss about different features, feature extraction approaches and emotion recognition and speaker verification databases.
Beam Dynamics Investigation of the 101.28 MHz IH Structure as Injector for the HIE-ISOLDE SC Linac
Creators: name: Fraser, M. A.
name: Pasini, M.
name: Jones, R. M.
name: Voulot, D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The first phase of the HIE-ISOLDE project at CERN consists of a superconducting (SC) linac upgrade in order to increase the energy of post-accelerated radioactive ion beams from 2.8 MeV/u to over 10 MeV/u (for A/q = 4.5). In preparation for the upgrade, we present beam dynamics studies of the booster section of the normal conducting (NC) REX-ISOLDE linac, focused on the longitudinal development of the beam in the 101.28 MHz Interdigital H-mode Structure (IHS), employing a Combined Zero Degree Structure (KONUS), pulsing at a high gradient of over 3 MV/m. The evolution of the transverse emittance in the SC linac depends critically on the injected longitudinal phase space distribution of particles from the existing linac and, with a better understanding of the beam dynamics upstream, the performance of the upgrade can be optimised. Data taken during the commissioning phase of the REX-ISOLDE linac is analysed to understand the properties of the beam in the booster and combined with beam dynamics simulations which include the realistic fields of the IHS, determined from both simulation and perturbation measurement.
description: 3 pages, 6 figures, 1 table, submitted to the International Particle Accelerator Conference (IPAC) 2010 in Kyoto
Kinetics of First Passage in a Cone
Creators: name: Ben-Naim, E.
name: Krapivsky, P. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study statistics of first passage inside a cone in arbitrary spatial dimension. The probability that a diffusing particle avoids the cone boundary decays algebraically with time. The decay exponent depends on two variables: the opening angle of the cone and the spatial dimension. In four dimensions, we find an explicit expression for the exponent, and in general, we obtain it as a root of a transcendental equation involving associated Legendre functions. At large dimensions, the decay exponent depends on a single scaling variable, while roots of the parabolic cylinder function specify the scaling function. Consequently, the exponent is of order one only if the cone surface is very close to a plane. We also perform asymptotic analysis for extremely thin and extremely wide cones.
description: 9 pages, 5 figures, 2 tables
Examining the patterns of out-of-school time activities in relation to positive youth development for a population of 4th grade children
Creators: name: Sweiss, Lina
Publisher: name: University of British Columbia
Year: 2014

description: Situated within a positive youth development (PYD) perspective, the purpose of the present study was to examine the combination of structured programs and free-time activities in a population-level sample of fourth grade children in relation to the Five Cs of PYD (i.e., indicators of positive functioning that include confidence, competence, connections, character, and caring; Lerner, Lerner et al., 2005). Data for this research were drawn from a large, population-level study. In all, 2,741 grade 4 children (48% girls) from diverse socio-economic status (SES) backgrounds in a large urban school district in Western Canada participated. A person-centered approach was used to identify different profile groups of involvement in structured programs and free-time activities during out-of-school time (OST). Profile groups were created using a cluster analytic technique for 2,193 children’s responses to four structured programs (educational lessons, art/music lessons, individual sports, and team sports) and eight free-time activities (sports/exercise for fun, watching television, video/computer games, instant messaging, reading for fun, practicing a musical instrument, household chores, and arts and crafts). Cluster analysis revealed three distinct profile groups of children that included a low involvement profile group (watching television, video/computer games, reading for fun), a free-time involvement profile group (participation in all eight free-time activities), and a high involvement profile group (participation in all four structured programs and all eight free-time activities). Hierarchical multiple regression was used to control for gender, language, family composition, and SES. Regression results and effect sizes showed the largest differences between children in the low involvement profile group and children in the high involvement profile group. Regression results and effect sizes showed minimal differences between children in the free-time involvement profile group and children in the high involvement profile group. Regression analyses examining interactions with gender and SES by profile groups were not significant. This study informs research and practice by addressing the patterns of participation in structured programs and free-time activities during middle childhood—two types of settings that primarily have been treated separately in the literature on OST and PYD during middle childhood.
Mobiles Eye-Tracking in den angewandten Wissenschaften
Creators: name: Gegenfurtner, Andreas
name: Eichinger, Armin
name: Latzel, Richard
name: Dietrich, Marc Philipp
name: Barkowsky, Marcus
name: Glufke, Alexandra
name: Stadler, Angelika
name: Stern, Wolfgang
Publisher: name: Bavarian Journal of Applied Sciences
Year: 2018

description: Bavarian Journal of Applied Sciences, 4 (2018), 370-395
Sampled Ready Queue Processing Time Estimation Using Size Measure Information In Multiprocessor Environment
Creators: name: More, Sarla
name: Diwakar Shukla
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Ready Queue
Lottery scheduling
Multiprocessors
Simulation
Sampling
Random
Estimation

description: In a multiprocessor computer system, there exist a ready queue of large number of processes waiting for computing resources allocation by the processors. These jobs may have size measure, which are additional information priory known while entry to the ready queue. Suppose the sudden system breakdown occurs and recovery management is required immediately. At this stage, one can find some processes who are completely finished, some partially processed, some blocked by processors and remaining waiting for allocation in the ready queue. Prime act of a system manager is to evaluate the maximum time required to process all the remaining jobs. This paper presents an estimation strategy for such, derived by applying the lottery scheduling, sampling technique and imputation methodology. Expressions for mean squared error of the proposed strategy are derived and optimized for suitable selection of system parameters. Three cases are discussed and compared and consequent results are numerically supported. It is found that at the optimal choice of constants in the estimation methodology, the shortest confidence interval can be predicted estimating the remaining required time. Such findings are useful as a part of disaster management of a cloud based multiprocessor data centre.
Excitation of stellar oscillations by gravitational waves: hydrodynamic model and numerical results for the Sun
Creators: name: Siegel, D. M.
name: Roth, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Starting from a general relativistic framework a hydrodynamic formalism is derived that yields the mean-square amplitudes and rms surface velocities of normal modes of non-relativistic stars excited by arbitrary gravitational wave (GW) radiation. In particular, stationary GW fields are considered and the resulting formulae are evaluated for two general types of GW radiation: radiation from a particular astrophysical source (e.g., a binary system) and a stochastic background of gravitational waves (SBGW). Expected sources and signal strengths for both types of GW radiation are reviewed and discussed. Numerical results for the Sun show that low-order quadrupolar g modes are excited more strongly than p modes by orders of magnitude. Maximal rms surface velocities in the case of excitation by astrophysical sources are found to be v {\le} 10^(-8) mm/s, assuming GW strain amplitudes of h {\le} 10^(-20). It is shown that current models for an SBGW produced by cosmic strings, with Omega_GW ~ 10^(-8)-10^(-5) in the frequency range of solar g modes, are able to produce maximal solar g-mode rms surface velocities of 10^(-5)-10^(-3) mm/s. This result lies close to or within the amplitude range of 10^(-3)-1 mm/s expected from excitation by turbulent convection, which is currently considered to be responsible for stellar g-mode excitation. It is concluded that studying g-mode observations of stars other than the Sun, in which excitation by GWs could be even more effective due to different stellar structures, might provide a new method to either detect GWs or to deduce a significant direct upper limit on an SBGW at intermediate frequencies between the pulsar bound and the bounds from interferometric detectors on Earth.
description: 20 pages, 5 figures
Transversal Dirac operators on distributions, foliations, and G-manifolds: Lecture notes
Creators: name: Richardson, Ken
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C12, 53C21, 58J50, 58J60

description: In these survey lectures, we investigate the geometric and analytic properties of transverse Dirac operators. In particular, we define a transverse Dirac operator associated to a distribution that is essentially self-adjoint (Prokhorenkov-R result). We describe the Habib-R Theorem showing that the invariance of the spectrum of a basic Dirac operator on a Riemannian foliation. The Bruening-Kamber-R theorems give Atiyah-Singer type formulas for the equivariant index of transversally elliptic operators on G-manifolds and the index of basic Dirac operators on Riemannian foliations. These notes contain exercises at the end of each subsection and are meant to be accessible to graduate students.
description: 38 pages, 86 exercises, lectures given at CRM (Barcelona)
Structural and biochemical characterizations of the skeletal muscle and cardiac ryanodine receptor N-terminal disease-associated mutants
Creators: name: Kimlicka, Lynn
Publisher: name: University of British Columbia
Year: 2014

description: Ryanodine receptors (RyRs) are calcium release channels located in the endo/sarcoplasmic reticulum that play a crucial role in the excitation-contraction coupling. Over 500 mutations have been found in the skeletal muscle (RyR1) and cardiac (RyR2) isoforms that cause severe muscle disorders or life-threatening arrhythmias. Mechanisms of these mutations have remained elusive largely due to the lack of high-resolution structures. Here, we compare pseudo-atomic models of the N-terminal region of RyR1 in the open and closed states together with crystal structures and thermal melts of multiple disease-associated mutants. We describe a model in which the intersubunit interface at the N-terminal region acts as a brake in channel opening. Next, we depict crystal structures of mutants at the intersubunit interface of RyR2 N-terminal region that perturb the structure of a loop targeted by multiple mutations. Furthermore, the crystal structure of the N-terminal domains of RyR2 reveals a unique, central anion-binding site. This anion binding is ablated in a disease-associated mutant that targets one of the anion-coordinating arginine residues, resulting in domain reorientations. Several other disease-causing mutations destabilize the protein. Taken together, the results illustrate a common theme across the RyR isoforms and their homologous IP₃ receptors that conformational changes at the N-terminal region caused by the destabilization of the interfaces are allosterically coupled to channel opening.
First-Passage Exponents of Multiple Random Walks
Creators: name: Ben-Naim, E.
name: Krapivsky, P. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We investigate first-passage statistics of an ensemble of N noninteracting random walks on a line. Starting from a configuration in which all particles are located in the positive half-line, we study S_n(t), the probability that the nth rightmost particle remains in the positive half-line up to time t. This quantity decays algebraically, S_n (t) ~ t^{-beta_n}, in the long-time limit. Interestingly, there is a family of nontrivial first-passage exponents, beta_1infinity limit, however, the exponents attain a scaling form, beta_n(N)--> beta(z) with z=(n-N/2)/sqrt{N}. We also demonstrate that the smallest exponent decays exponentially with N. We deduce these results from first-passage kinetics of a random walk in an N-dimensional cone and confirm them using numerical simulations. Additionally, we investigate the family of exponents that characterizes leadership statistics of multiple random walks and find that in this case, the cone provides an excellent approximation.
description: 9 pages, 8 figures, 7 tables
A multi-tracer study of the role of sea ice in the Arctic Ocean carbon cycle
Creators: name: Brown, Kristina Anne
Publisher: name: University of British Columbia
Year: 2014

description: Recent Arctic warming and reduced summer sea ice extent have stimulated increased research into the role of sea ice in the high latitude carbon cycle. Using data collected on a number of field expeditions throughout the Arctic Ocean, I apply a multi-tracer approach to investigate the influence of the sea-ice life cycle on the biological and abiotic export of CO₂ into the sub-surface. The results of this study illuminate the role of sea ice in polar carbon cycling across the perennial sea ice region of the central Canada Basin and in the seasonal ice zone of the Canadian Arctic Archipelago. In the perennial sea ice region, lateral exchanges of shelf derived carbon were found to exert the most important control on carbon distribution in the central Canada Basin, both in the surface mixed layer and in the sub-surface halocline. Stable carbon isotope data suggest that surface water particulate organic carbon is derived, to a large extent, from external inputs from Eurasian rivers. Further, results from a suite of geochemical tracers show that sub-surface accumulation of dissolved inorganic carbon in the halocline reflects an organic matter remineralization signature derived from the shelves and transported into the halocline by dense Pacific winter waters. Within the seasonal ice zone, observations over the winter-spring transition illustrated a highly dynamic carbon cycle, and results from this study provide new insight into the biological, physical and chemical factors which contribute to C cycling in different depth horizons of the ice over this period. Physical constraints on inorganic carbon cycling dominated CO₂ distributions in the majority of the ice column early in the season. As the melt period advanced, sea ice melt dilution led to decreasing CO₂ partial pressures in brine, contributing to pCO₂ under-saturation and CO₂ uptake from the atmosphere as the melt period advanced. In contrast, the carbonate system in bottom ice layers was much more closely tied to the flourishing algal community. Our inorganic carbon system measurements within natural sea ice brine samples further reveal the limitations of current thermodynamic constants used to compute carbonate system equilibrium in sea ice systems.
Statistical Analysis of Marshall-Olkin inverse Maxwell Distribution: Estimation and Application to Real Data
Creators: name: C. P. Yadav
name: Jitendra Kumar
name: M.S. Panwar
Publisher: name: Reliability: Theory & Applications
Year: 2021
Subjects: Marshall-Olkin Family
Tilt Parameter
Inverse Maxwell Distribution
Stochastic Ordering
Maximum Likelihood Estimate
Maximum Spacing
Record Value
Stress-Strength Reliability
Random Censoring

description: In this paper, Marshall-Olkin inverse Maxwell distribution is proposed by generalizing the inverse Maxwell distribution under the Marshall-Olkin family of distribution that leads to greater flexibility in modeling various new data types. The basic statistical properties for the proposed distribution including moments, quantile function, median, skewness, kurtosis, and stochastic ordering are derived. Point estimates for the parameters are obtained by using two well known methods maximum likelihood and maximum spacing methods. The confidence intervals are used by using asymptotic properties of maximum likelihood estimators and boot-p methods. We have applied the proposed distribution under different real-life scenarios such as record value problem, system lifetime distributions, stress-strength reliability and random censored problems. For illustration purposes, simulation and real data results are established.
Chromatographic analysis and residue degradation of phenamacril and difenoconazole on strawberries
Creators: name: Xu, Feng
name: Xu, Duo
name: Hu, Mengqing
name: Chen, Liuyang
name: Xu, Chenlong
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Strawberries are widely cultivated and highly consumed globally, but pests and diseases can severely affect yields. Phenamacril and difenoconazole are high-efficacy pesticides and the mixture of these two pesticides offers a satisfactory option for disease control. In this study, an optimised QuEChERS method combined with dispersive solid-phase extraction purification before injection for simultaneously determining the residues of phenamacril–difenoconazole mixture on strawberries was developed and validated using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC–MS/MS). Average recoveries of phenamacril and difenoconazole in the strawberry matrices ranged from 100% to 104% and 99% to 104%, with relative standard deviations of 2.6%–5.3% and 2.2%–5.5%, respectively. The degradation half-lives of phenamacril and difenoconazole were 3.5–6.6 days and 2.2–3.4 days on strawberries, respectively. Final residues of phenamacril and difenoconazole on strawberries at eight different cultivation regions were 0.033–0.66 mg kg−1 and <0.02–0.089 mg kg−1 after spraying at the maximum dosage recommended by the company of 300 mg a.i. kg−1 twice, respectively. Overall, this study is the first report of phenamacril and difenoconazole residue analysis in strawberries. Therefore, it could provide the reference data for safe management and proper use of phenamacril and difenoconazole in China.
Generalization of Schwinger-Zwanziger Dyon to Quaternion
Creators: name: Negi, O. P. S.
name: Dehnen, H.
name: Karnatak, Gaurav
name: Bisht, P. S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Physics (physics.gen-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Postulating the existence of magnetic monopole in electromagnetism and Heavisidian monopoles in gravitational interactions, a unified theory of gravi-electromagnetism has been developed on generalizing the Schwinger-Zwanziger formulation of dyon to quaternion in simple and consistent manner. Starting with the four Lorentz like forces on different charges, we have generalized the Schwinger-Zwanziger quantization parameters in order to obtain the angular momentum for unified fields of dyons and gravito-dyons (i.e. Gravi-electromagnetism). Taking the unified charge as quaternion, we have reformulated manifestly covariant and consistent theory for the dynamics of four charges namely electric, magnetic, gravitational and Heavisidian associated with gravi electromagnetism. PACS No: 14.80 Hv.
Generalized Kaluza-Klein monopole, quadratic algebras and ladder operators
Creators: name: Marquette, Ian
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a generalized Kaluza-Klein monopole system. We solve this quantum superintegrable systems on a Euclidean Taub Nut manifold using the separation of variables of the corresponding Schroedinger equation in spherical and parabolic coordinates. We present the integrals of motion of this system, the quadratic algebra generated by these integrals, the realization in term of a deformed oscillator algebra using the Daskaloyannis construction and the energy spectrum. The structure constants and the Casimir operator are functions not only of the Hamiltonian but also of other two integrals commuting with all generators of the quadratic algebra and forming an Abelian subalgebra. We present an other algebraic derivation of the energy spectrum of this system using the factorization method and ladder operators.
description: 13 pages