Measurement of the Intrinsic Radiopurity of Cs-137/U-235/U-238/Th-232 in CsI(Tl) Crystal Scintillators

The inorganic crystal scintillator CsI(Tl) has been used for low energy neutrino and Dark Matter experiments, where the intrinsic radiopurity is an issue of major importance. Low-background data were taken with a CsI(Tl) crystal array at the Kuo-Sheng Reactor Neutrino Laboratory. The pulse shape discrimination capabilities of the crystal, as well as the temporal and spatial correlations of the events, provide powerful means of measuring the intrinsic radiopurity of Cs-137 as well as the U-235, U-238 and Th-232 series. The event selection algorithms are described, with which the decay half-lives of Po-218, Po-214, Rn-220, Po-216 and Po-212 were derived. The measurements of the contamination levels, their concentration gradients with the crystal growth axis, and the uniformity among different crystal samples, are reported. The radiopurity in the U-238 and Th-232 series are comparable to those of the best reported in other crystal scintillators. Significant improvements in measurement sensitivities were achieved, similar to those from dedicated massive liquid scintillator detector. This analysis also provides in situ measurements of the detector performance parameters, such as spatial resolution, quenching factors, and data acquisition dead time.Comment: 28 pages, 12 figure

A STUDY OF THE PERCEPTIONS OF ENGLISH FACULTY AND STUDENTS OF EXIT ENGLISH EXAMINATIONS AT TAIWAN\u27S TECHNOLOGICAL AND VOCATIONAL HIGHER EDUCATION INSTITUTIONS

The mix-method research aimed to investigate the attitudes toward the implementation of Exit English Examination (EEE) from the perspectives of English faculties and their students at Taiwan\u27s technological and vocational higher education institutions. The survey participants were 66 English faculty and 1009 students in ten first-tier Universities of Technology and Institutes of Technology in Northern Taiwan based on the admission scores of the Technological and Vocational College Entrance Examination in the school year of 2009-2010. Descriptive statistics, Chi-Square tests, Mann-Whitney U tests, Kruskal-Wallis tests, and Spearman Correlation tests of the SPSS were conducted to determine the characteristics and statistically significant differences of participants\u27 survey questions. Findings indicated the following: various factors for the faculties and students played significant roles in attitudes toward EEE implementation; motivation and desire to learn English were highest in those students with medium English performance; a majority of students perceived a stronger influence from the EEE than the faculties; influence of the EEE on future jobs was recognized by both groups, as well as the need for assistance with fees, monetary incentives, and the subsidization for financially challenged students; faculties and students had conflicting opinions in regard to teaching to the test, the curriculum, and teaching effectiveness; the qualitative data analyses was predominated by concern regarding the test standard, test choices and future jobs. Suggestions for this study included: a continuous implementation and overhaul of the EEE in Higher Education; help in facilitating professional development and a learning community; a review and adjustment of the existing English curriculum, methods and test standards; an alignment of the curriculum with the EEE standard and student preparation; a review of existing preparation programs, including monetary incentives and fees; professional assistance for juniors and seniors; utilization of international counterparts\u27 assessment tools. Further research could include (a) covering major stakeholder\u27s participation in decision making, implementation and gathering of information and analysis, (b) longitudinal work tracking students who failed the EEE, and (c) replicating a similar study in other geographical areas of Taiwan. Numerous implications for future studies were also provided

The relationship between economic value added, return on assets, and return on equity with market value added in Tehran stock Exchange (TSE)

This study aim is to examine the relationship between economic value added (EVA, return on assets (ROA), and return on equity (ROE) with market value added (MVA) in Tehran Stock Exchange (TSE). The sample involves 87 non - financial companies listed in Tehran Stock Exchange (TSE) over the period 2004–2008. Pearson correlation coefficient and regression method was employed to analysis the scondary data. The results indicated there are meaningful correlation between EVA, and ROE with MVA, but there is not meaningful association between ROA and MVA

Measurement of the W^±Z production cross section and limits on anomalous triple gauge couplings in proton–proton collisions at √s = 7 TeV with the ATLAS detector

This Letter presents a measurement of W^± Z production in 1.02 fb^(−1) of pp collision data at √s = 7 TeV collected by the ATLAS experiment in 2011. Doubly leptonic decay events are selected with electrons, muons and missing transverse momentum in the final state. In total 71 candidates are observed, with a background expectation of 12.1 ± 1.4(stat.)^(+4.1)_(−2.0)(syst.) events. The total cross section for W^± Z production for Z/γ^∗ masses within the range 66 GeV to 116 GeV is determined to be σ^(tot)_(WZ) = 20.5^(+3.1)_(−2.8)(stat.)^(+1.4)_(−1.3)(syst.)^(+0.9)_(−0.8)(lumi.) pb, which is consistent with the Standard Model expectation of 17.3^(+1.3) _(0.8) pb. Limits on anomalous triple gauge boson couplings are extracted

Measurement of the WZ production cross section in pp collisions at [Formula: see text] and 8[Formula: see text] and search for anomalous triple gauge couplings at [Formula: see text].

The WZ production cross section is measured by the CMS experiment at the CERN LHC in proton-proton collision data samples corresponding to integrated luminosities of 4.9[Formula: see text] collected at [Formula: see text], and 19.6[Formula: see text] at [Formula: see text]. The measurements are performed using the fully-leptonic WZ decay modes with electrons and muons in the final state. The measured cross sections for [Formula: see text] are [Formula: see text] [Formula: see text] and [Formula: see text] [Formula: see text]. Differential cross sections with respect to the [Formula: see text] boson [Formula: see text], the leading jet [Formula: see text], and the number of jets are obtained using the [Formula: see text] data. The results are consistent with standard model predictions and constraints on anomalous triple gauge couplings are obtained

Doubly charged Higgs bosons and three-lepton signatures in the Higgs Triplet Model

Doubly charged Higgs bosons, H^{\pm\pm}, are being searched for in the Tevatron experiments. The most recent search by the D0 collaboration seeks three muons (mu^\pm\mu^\pm\mu^\mp), which are assumed to originate from the pair-production process, q\overline q\to H^{++}H^{--}, followed by the decay H^{\pm\pm} \to \mu^\pm \mu^\pm. In this three-lepton (3l) channel there are six distinct signatures for l=e or \mu. In the context of the Higgs Triplet Model, we quantify the dependence of the event numbers for the 3l channels on the parameters of the neutrino mass matrix. It is also shown that the inclusion of the production mechanism q \overline{q'} \to H^{\pm\pm}H^{\mp}, followed by the decay H^\pm\to l^ \pm\nu, would significantly increase the discovery potential in these channels. We then provide perspectives on the production of these channels at the Tevatron and LHC.Comment: 13 pages, 12 figure

On-line modeling and control via T-S fuzzy models for nonaffine nonlinear systems using a second type adaptive fuzzy approach

[[abstract]]This paper proposes a novel method for on-line modeling and robust adaptive control via Takagi-Sugeno (T-S) fuzzy models for nonaffine nonlinear systems, with external disturbances. The T-S fuzzy model is established to approximate the nonaffine nonlinear dynamic system in a linearized way. The so-called second type adaptive law is adopted, where not only the consequent part (the weighting factors) of fuzzy implications but also the antecedent part (the membership functions) of fuzzy implications are adjusted. Fuzzy B-spline membership functions (BMFs) are used for on-line tuning. Furthermore, the effect of all the unmodeled dynamics, BMF modeling errors and external disturbances on the tracking error is attenuated by a fuzzy error compensator which is also constructed from the T-S fuzzy model. In this paper, we can prove that the closed-loop system which is controlled by the proposed controller is stable and the tracking error will converge to zero. Three examples are simulated in order to confirm the effectiveness and applicability of the proposed methods in this paper.[[notice]]補正完

Towards Explainable Conversational Recommender Systems

Explanations in conventional recommender systems have demonstrated benefits in helping the user understand the rationality of the recommendations and improving the system's efficiency, transparency, and trustworthiness. In the conversational environment, multiple contextualized explanations need to be generated, which poses further challenges for explanations. To better measure explainability in conversational recommender systems (CRS), we propose ten evaluation perspectives based on concepts from conventional recommender systems together with the characteristics of CRS. We assess five existing CRS benchmark datasets using these metrics and observe the necessity of improving the explanation quality of CRS. To achieve this, we conduct manual and automatic approaches to extend these dialogues and construct a new CRS dataset, namely Explainable Recommendation Dialogues (E-ReDial). It includes 756 dialogues with over 2,000 high-quality rewritten explanations. We compare two baseline approaches to perform explanation generation based on E-ReDial. Experimental results suggest that models trained on E-ReDial can significantly improve explainability while introducing knowledge into the models can further improve the performance. GPT-3 in the in-context learning setting can generate more realistic and diverse movie descriptions. In contrast, T5 training on E-ReDial can better generate clear reasons for recommendations based on user preferences. E-ReDial is available at https://github.com/Superbooming/E-ReDial