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5.
  • Abas, N., et al. (författare)
  • Dynamic simulation of solar water heating system using supercritical CO2 as mediating fluid under sub-zero temperature conditions
  • 2019
  • Ingår i: Applied Thermal Engineering. - Elsevier Ltd. - 1359-4311. ; 161
  • Tidskriftsartikel (refereegranskat)abstract
    • CO2 is becoming increasingly important as a mediating fluid, and simulation studies are indispensable for corresponding developments. In this study, a simulation-based performance investigation of a solar water heating system using CO2 as a mediating fluid under sub-zero temperature condition is performed using the TRNSYS® software. The maximum performance is achieved at a solar savings fraction of 0.83 during July. The as lowest solar savingss fraction of 0.41 is obtained during December. The annual heat production of the proposed system under Fargo climate is estimated to be about 2545 kWh. An evacuated glass tube solar collector is designed, fabricated and tested for various climate conditions. Moreover, a detailed comparison of the system's performance at sub/supercritical and supercritical pressures shows that the annual heat transfer efficiency of the modeled system is 10% higher at supercritical pressure than at sub/supercritical pressures. This result can be attributd to the strong convection flow of CO2 caused by density inhomogeneities, especially in the near critical region. This condition resuls in high heat transfer rates.
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6.
  • Abbas, M., et al. (författare)
  • Common Fixed Points of Generalized Rational Type Cocyclic Mappings in Multiplicative Metric Spaces
  • 2015
  • Ingår i: Discrete dynamics in nature and society. - 1026-0226. ; 2015
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to present fixed point result of mappings satisfying a generalized rational contractive condition in the setup of multiplicative metric spaces. As an application, we obtain a common fixed point of a pair of weakly compatible mappings. Some common fixed point results of pair of rational contractive types mappings involved in cocyclic representation of a nonempty subset of a multiplicative metric space are also obtained. Some examples are presented to support the results proved herein. Our results generalize and extend various results in the existing literature.
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7.
  • Abbas, Mujahid, et al. (författare)
  • Common fixed points of set-valued F-contraction mappings on domain of sets endowed with directed graph
  • 2017
  • Ingår i: Computational and Applied Mathemathics. - SPRINGER HEIDELBERG. - 0101-8205. ; 36:4, s. 1607-1622
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to present common fixed point results of set-valued graphic F-contraction mappings on a family of sets endowed with a graph. Some examples are presented to support the results proved herein. Our results unify, generalize and extend various results in the existing literature.
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8.
  • Abbas, M., et al. (författare)
  • On Weakly Commuting Set-Valued Mappings on a Domain of Sets Endowed with Directed Graph
  • 2017
  • Ingår i: Results in Mathematics. - Birkhauser Verlag AG. - 1422-6383. ; 71:3-4, s. 1277-1295
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to present coincidence and common fixed point results of set-valued mappings satisfying certain generalized graphic F-contractive conditions on a family of sets endowed with a graph. It is worth mentioning that these results are obtained without appealing to any form of continuity of mappings involved herein. Some examples are presented to support the results proved in this paper. Our results unify, generalize and extend various comparable results in the existing literature. © 2016, Springer International Publishing.
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9.
  • Abbaspour Asadollah, Sara, et al. (författare)
  • 10 Years of research on debugging concurrent and multicore software : a systematic mapping study
  • 2017
  • Ingår i: Software quality journal. - 0963-9314. ; 25:1, s. 49-82
  • Tidskriftsartikel (refereegranskat)abstract
    • Debugging – the process of identifying, localizing and fixing bugs – is a key activity in software development. Due to issues such as non-determinism and difficulties of reproducing failures, debugging concurrent software is significantly more challenging than debugging sequential software. A number of methods, models and tools for debugging concurrent and multicore software have been proposed, but the body of work partially lacks a common terminology and a more recent view of the problems to solve. This suggests the need for a classification, and an up-to-date comprehensive overview of the area. This paper presents the results of a systematic mapping study in the field of debugging of concurrent and multicore software in the last decade (2005– 2014). The study is guided by two objectives: (1) to summarize the recent publication trends and (2) to clarify current research gaps in the field.Through a multi-stage selection process, we identified 145 relevant papers. Based on these, we summarize the publication trend in the field by showing distribution of publications with respect to year , publication venues , representation of academia and industry , and active research institutes . We also identify research gaps in the field based on attributes such as types of concurrency bugs, types of debugging processes , types of research  and research contributions.The main observations from the study are that during the years 2005–2014: (1) there is no focal conference or venue to publish papers in this area, hence a large variety of conferences and journal venues (90) are used to publish relevant papers in this area; (2) in terms of publication contribution, academia was more active in this area than industry; (3) most publications in the field address the data race bug; (4) bug identification is the most common stage of debugging addressed by articles in the period; (5) there are six types of research approaches found, with solution proposals being the most common one; and (6) the published papers essentially focus on four different types of contributions, with ”methods” being the type most common one.We can further conclude that there is still quite a number of aspects that are not sufficiently covered in the field, most notably including (1) exploring correction  and fixing bugs  in terms of debugging process; (2) order violation, suspension  and starvation  in terms of concurrency bugs; (3) validation and evaluation research  in the matter of research type; (4) metric  in terms of research contribution. It is clear that the concurrent, parallel and multicore software community needs broader studies in debugging.This systematic mapping study can help direct such efforts.
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10.
  • Abbaspour Asadollah, Sara, et al. (författare)
  • A Model for Systematic Monitoring and Debugging of Starvation Bugs in Multicore Software
  • 2016
  • Ingår i: 2016 ASE Workshop on Specification, Comprehension, Testing and Debugging of Concurrent Programs SCTDCP2016.
  • Konferensbidrag (refereegranskat)abstract
    • With the development of multicore hardware, concurrent, parallel and multicore software are becoming increasingly popular. Software companies are spending a huge amount of time and resources to nd and debug the bugs. Among all types of software bugs, concurrency bugs are also important and troublesome. This type of bugs is increasingly becoming an issue particularly due to the growing prevalence of multicore hardware. In this position paper, we propose a model for monitoring and debugging Starvation bugs as a type of concurrency bugs in multicore software. The model is composed into three phases: monitoring, detecting and debugging. The monitoring phase can support detecting phase by storing collected data from the system execution. The detecting phase can support debugging phase by comparing the stored data with starvation bug's properties, and the debugging phase can help in reproducing and removing the Starvation bug from multicore software. Our intention is that our model is the basis for developing tool(s) to enable solving Starvation bugs in software for multicore platforms.
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