645 research outputs found
Accelerating Stresses for Life Testing of Switch-Mode Power Supplies
I.B.M U.K. Ltd procure Switch-Mode Power Supplies to place in the computers they manufacture. These Power Supplies are tested to ensure that they meet a specified reliability target. Due to the high Mean Time To Failure (MTTF) the test duration required to verify the MTTF is in excess of three months. In an attempt to find a way to reduce the time required to ensure this requirement is met it was decided to investigate a selection of stresses from the point of view of their-effectiveness as a means of accelerating life tests. Subsequent to a theoretical exploration of the topics of Switch-Mode Power Supplies, Reliability and Accelerated Life Testing the power supplies were subjected to High Ambient Temperatures, High Relative Humidity, Power Cycling, Temperature Cycling and various conditions of electrical Stress. The effectiveness of these stresses was gauged by checking the power supplies' performance after various intervals during which they had been subjected to stress. It was discovered that high ambient temperatures have a measureable effect on electrolytic capacitors, which is physically related to the amount of energy to which the capacitors are subjected, to the extent that several capacitors failed during the tests without other damage being done to the power supply. It is recommended that further research be undertaken with a view to developing a relationship between capacitor degradation and power supply life test duration because, since the capacitors MTTF is greater than that of the power supply, failure due to degradation would indicate that the power supply had passed its specified MTTF
SECaps: A Sequence Enhanced Capsule Model for Charge Prediction
Automatic charge prediction aims to predict appropriate final charges
according to the fact descriptions for a given criminal case. Automatic charge
prediction plays a critical role in assisting judges and lawyers to improve the
efficiency of legal decisions, and thus has received much attention.
Nevertheless, most existing works on automatic charge prediction perform
adequately on high-frequency charges but are not yet capable of predicting
few-shot charges with limited cases. In this paper, we propose a Sequence
Enhanced Capsule model, dubbed as SECaps model, to relieve this problem.
Specifically, following the work of capsule networks, we propose the seq-caps
layer, which considers sequence information and spatial information of legal
texts simultaneously. Then we design a attention residual unit, which provides
auxiliary information for charge prediction. In addition, our SECaps model
introduces focal loss, which relieves the problem of imbalanced charges.
Comparing the state-of-the-art methods, our SECaps model obtains 4.5% and 6.4%
absolutely considerable improvements under Macro F1 in Criminal-S and
Criminal-L respectively. The experimental results consistently demonstrate the
superiorities and competitiveness of our proposed model.Comment: 13 pages, 3figures, 5 table
On Statistical Mechanics Developments of Clan Concept in Multiparticle Production
Clan concept has been introduced in multiparticle dynamics in order to
interpret the wide occurrence of negative binomial (NB) regularity in n-charged
particle multiplicity distributions (MDs) in various high energy collisions.
The centrality of clan concept led to the attempt to justify its occurrence
within a statistical model of clan formation and evolution. In this framework
all thermodynamical potentials have been explicitly calculated in terms of NB
parameters. Interestingly it was found that NB parameter k corresponds to the
one particle canonical partition function. The goal of this paper is to explore
a possible temperature and volume dependence of parameter k in various classes
of events in high energy hadron-hadron collisions. It is shown that the
existence of a phase transition at parton level from the ideal clan gas
associated to the semihard component with k>1 to the ideal clan gas of the hard
component with k<1 implies a discontinuity in the average number of particles
at hadron level.Comment: 20 pages, latex, no figures; v2: the description of the framework has
been considerably expanded, and the main body has been reorganized for
clarit
Enhancing outcomes of low-intensity parenting groups through sufficient exemplar training: a randomized control trial
Low-intensity parenting groups, such as the Triple P-Positive Parenting Program Discussion Groups, appear to be a cost-effective intervention for child conduct problems. Several studies evaluating a Triple P Discussion Group on disobedience found promising results for improving child and parent outcomes. However, a sufficient exemplar training approach that incorporates generalization promotion strategies may assist parents to more flexibly apply positive parenting principles to a broader range of child target behaviors and settings, leading to greater change. We compared the effects of sufficient exemplar training to an existing narrowly focused low-intensity intervention. Participants were 78 families with a 5–8 year-old child. Sufficient exemplar training resulted in more robust changes in child behavior and superior outcomes for mothers on measures of parenting behavior, parenting self-efficacy, mental health, and perceptions of partner support at post-intervention and 6-month follow-up. These results indicate that teaching sufficient exemplars may promote generalization leading to enhanced intervention outcomes
Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: A Monte Carlo investigation
We investigate the thermal activated magnetisation reversal in a single
ferromagnetic nanoparticle with uniaxial anisotropy using Monte Carlo
simulations. The aim of this work is to reproduce the reversal magnetisation by
uniform rotation at very low temperature in the high energy barrier hypothesis,
that is to realize the N\'eel-Brown model. For this purpose we have considered
a simple cubic nanoparticle where each site is occupied by a classical
Heisenberg spin. The Hamiltonian is the sum of an exchange interaction term, a
single-ion anisotropy term and a Zeeman interaction term. Our numerical data of
the thermal variation of the switching field are compared to an approximated
expression and previous experimental results on Co nanoparticles
Enhancing father engagement and interparental teamwork in an evidence-based parenting intervention: a randomized-controlled trial of outcomes and processes
This study examined the outcomes and process in a positive parenting program adapted to enhance father engagement and teamwork. A randomized control trial of the Group Triple P Program with additional father-relevant content was conducted with 42 families of children with conduct problems aged between 3 to 8 years. Families were allocated to either the intervention or waitlist condition. Assessments of child behavior, self- and partner-reported parenting, and the interparental relationship were conducted at T1 (pre), T2 (post), and T3 (6-month follow-up). Observations were used to examine fathers’ and mothers’ unique and shared contributions to group process during participation in parenting group sessions. Following program completion (T2) intervention group fathers and mothers reported significantly fewer child behavior problems, dysfunctional parenting practices, and interparental conflict about child-rearing than waitlist parents. Intervention group mothers also reported increased parenting confidence and rated their partners as showing significantly fewer dysfunctional parenting practices. Intervention effects were maintained at 6-month follow-up. Observational data showed that fathers and mothers made similar contributions during the group sessions. The most frequent types of contributions were asking questions and sharing information with other parents about implementing parenting strategies. The key differences between parents were fathers' more frequent use of humor and mothers' more frequent sharing of personal stories and reporting co-parenting cooperation. The levels of session attendance and program satisfaction were high for both fathers and mothers. Findings highlight the potential benefits of efforts to engage both fathers and mothers for program adherence, satisfaction, and effectiveness
The Green Bank Ammonia Survey: Unveiling the Dynamics of the Barnard 59 star-forming Clump
Understanding the early stages of star formation is a research field of
ongoing development, both theoretically and observationally. In this context,
molecular data have been continuously providing observational constraints on
the gas dynamics at different excitation conditions and depths in the sources.
We have investigated the Barnard 59 core, the only active site of star
formation in the Pipe Nebula, to achieve a comprehensive view of the kinematic
properties of the source. These information were derived by simultaneously
fitting ammonia inversion transition lines (1,1) and (2,2). Our analysis
unveils the imprint of protostellar feedback, such as increasing line widths,
temperature and turbulent motions in our molecular data. Combined with
complementary observations of dust thermal emission, we estimate that the core
is gravitationally bound following a virial analysis. If the core is not
contracting, another source of internal pressure, most likely the magnetic
field, is supporting it against gravitational collapse and limits its star
formation efficiency.Comment: 18 pages, 18 figure
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