71 research outputs found
Arterial Performance Evaluation on an Adaptive Traffic Signal Control System
AbstractThis paper documents the evaluation of Sydney Coordinated Adaptive Traffic System (SCATS) at a major signalized arterial in Las Vegas. The evaluation was based on various performance measures, including primarily travel times and stops at selected routes along the arterial. Extensive travel time runs were conducted during the weekday and weekend peak periods. Arterial performance was compared between SCATS and conventional time-of-day (TOD) coordination plans. Based on the data and analysis results, a general conclusion was reached that no significant improvement on arterial progression was achieved with SCATS under normal traffic conditions. However, this conclusion was made based on a major limitation of using video detection in the field, which may have significantly limited SCATS from achieving its best performance
An Investigation into the Connection between Language Proficiency and Text Analysis Abilities in English Learners
This studyâs objective is to evaluate whether or not there is a correlation between studentsâ command of the English language and their analytical prowess with regard to written material. Through quantitative and qualitative study on students with varied degrees of linguistic proficiency, it has been found that an increase in oneâs level of linguistic competence is strongly and favorably associated with an increase in oneâs ability for textual analysis. This discovery was made on students with varying levels of linguistic proficiency. Learners who have a higher degree of language competency are able to more effectively absorb vocabulary, grammatical structure, and logical links in the discourse when reading and interpreting English texts. This is because they have a better understanding of the English language. As a consequence of this, they are capable of performing text analysis in a manner that is both more effective and more accurate than before. This articleâs goal is to give instructional strategies for learners of all language levels in order to optimize the process of strengthening those learnersâ ability to evaluate texts. The target audience for this article is learners of all language levels. When these strategies are utilized, educators will be provided with practical recommendations that will assist them in more effectively directing students toward mastery of the basic text analysis skills. The outcomes of this study may, in some way, have an impact on the educational practice of teaching English as a second language
Compressive properties and micro-structural characteristics of Tiâ6Alâ4V fabricated by electron beam melting and selective laser melting
Bulk Tiâ6Alâ4V material and its lattice structures with rhombic dodecahedron unit cells are fabricated by electron beam melting (EBM) and selective laser melting (SLM) method respectively. The effect of part size on the compressive properties and failure modes of the material is taken into consideration. Electronic universal testing machine and Split Hopkinson pressure bar (SHPB) system are adopted for experiments, and the compressive behavior of the additively manufactured materials is investigated accordingly. Meanwhile, multiscale observations are conducted to reveal the macro- and microscopic deformation mechanism. The results showed that the mechanical response of the dense struts as well as micro-lattice structures manufactured by the two processes are quite different. The geometric imperfections are considered to reduce the strength of the undersized struts prepared by EBM. The specimens fabricated by both of the two approaches exhibit elastic-plastic deformation. Besides, the SLM made material is found to be more sensitive to strain rate especially for that below 1000/s than the EBM parts
Cognitive Function and CardiometabolicâInflammatory Risk Factors Among Older Indians and Americans
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/156424/2/jgs16734_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/156424/1/jgs16734.pd
Superconductivity in the high-entropy ceramics Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx with possible nontrivial band topology
Topological superconductors have drawn significant interest from the
scientific community due to the accompanying Majorana fermions. Here, we report
the discovery of electronic structure and superconductivity in high-entropy
ceramics Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx (x = 1 and 0.8) combined with experiments
and first-principles calculations. The Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx high-entropy
ceramics show bulk type-II superconductivity with Tc about 4.00 K (x = 1) and
2.65 K (x = 0.8), respectively. The specific heat jump is equal to 1.45 (x = 1)
and 1.52 (x = 0.8), close to the expected value of 1.43 for the BCS
superconductor in the weak coupling limit. The high-pressure resistance
measurements show that a robust superconductivity against high physical
pressure in Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2C, with a slight Tc variation of 0.3 K
within 82.5 GPa. Furthermore, the first-principles calculations indicate that
the Dirac-like point exists in the electronic band structures of
Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2C, which is potentially a topological superconductor.
The Dirac-like point is mainly contributed by the d orbitals of transition
metals M and the p orbitals of C. The high-entropy ceramics provide an
excellent platform for the fabrication of novel quantum devices, and our study
may spark significant future physics investigations in this intriguing
material.Comment: 28 pages, 7 figures,The manuscript with the same title will be
published by Advanced Scienc
Metamorphic testing: a review of challenges and opportunities
Metamorphic testing is an approach to both test case generation and test result verification. A central element is a set of metamorphic relations, which are necessary properties of the target function or algorithm in relation to multiple inputs and their expected outputs. Since its first publication, we have witnessed a rapidly increasing body of work examining metamorphic testing from various perspectives, including metamorphic relation identification, test case generation, integration with other software engineering techniques, and the validation and evaluation of software systems. In this paper, we review the current research of metamorphic testing and discuss the challenges yet to be addressed. We also present visions for further improvement of metamorphic testing and highlight opportunities for new research
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