| 1. |
- Basloom, Huda Saleh, et al.
(author)
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Errors Classification and Static Detection Techniques for Dual-Programming Model (OpenMP and OpenACC)
- 2022
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In: IEEE Access. - : Institute of Electrical and Electronics Engineers (IEEE). - 2169-3536. ; 10, s. 117808-117826
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Journal article (peer-reviewed)abstract
- Recently, incorporating more than one programming model into a system designed for high performance computing (HPC) has become a popular solution to implementing parallel systems. Since traditional programming languages, such as C, C++, and Fortran, do not support parallelism at the level of multi-core processors and accelerators, many programmers add one or more programming models to achieve parallelism and accelerate computation efficiently. These models include Open Accelerators (OpenACC) and Open Multi-Processing (OpenMP), which have recently been used with various models, including Message Passing Interface (MPI) and Compute Unified Device Architecture (CUDA). Due to the difficulty of predicting the behavior of threads, runtime errors cannot be predicted. The compiler cannot identify runtime errors such as data races, race conditions, deadlocks, or livelocks. Many studies have been conducted on the development of testing tools to detect runtime errors when using programming models, such as the combinations of OpenACC with MPI models and OpenMP with MPI. Although more applications use OpenACC and OpenMP together, no testing tools have been developed to test these applications to date. This paper presents a testing tool for detecting runtime using a static testing technique. This tool can detect actual and potential runtime errors during the integration of the OpenACC and OpenMP models into systems developed in C++. This tool implement error dependency graphs, which are proposed in this paper. Additionally, a dependency graph of the errors is provided, along with a classification of runtime errors that result from combining the two programming models mentioned earlier.
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| 2. |
- Zhang, Ye, et al.
(author)
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Application of graphdiyne oxide in photoelectrochemical-type photodetectors and ultrafast fiber lasers
- 2022
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In: Nano Today. - : Elsevier. - 1748-0132 .- 1878-044X. ; 47
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Journal article (peer-reviewed)abstract
- Graphdiyne oxide (GDYO), the oxidized form of graphdiyne (GDY), has been widely explored for applica-tions in various technological fields owing to its fascinating properties. However, the research of GDYO for applications in photodetectors (PDs) and mode-locker has been lagging. Herein, we present experimental demonstrations of promising applications of GDYO for narrow-band photoelectrochemical (PEC)-type PDs with tunable performance. Moreover, the measured excellent nonlinear optical absorption of GDYO makes it a suitable material for mode-locking in ultrafast fiber lasers. Ultrastable pulses as short as 1.5 ps could be obtained from an Erbium-doped fiber laser based on GDYO at 1559 nm. These findings have been supported and interpreted by density functional theory (DFT) calculations as well as transient absorption dynamics studies. The presented results provide pathways for the future utilization of GDYO in high-performance optoelectronic devices.
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| 3. |
- Gao, Lingfeng, et al.
(author)
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Optical Properties of Few-Layer Ti3CN MXene : From Experimental Observations to Theoretical Calculations
- 2022
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In: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 16:2, s. 3059-3069
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Journal article (peer-reviewed)abstract
- Despite the emerging interest in research and development of Ti3CN MXene nanosheet (NS)-based optoelectronic devices, there is still a lack of in-depth studies of the underlying photophysical processes, like carrier relaxation dynamics and nonlinear photon absorption, operating in such devices, hindering their further and precise design. In this paper, we attempt to remedy the situation by fabricating few-layer Ti3CN NSs via combining selective etching and molecular intercalation and by investigating the carrier relaxation possesses and broadband nonlinear optical responses via transient absorption and Z-scan techniques. These results are complemented by first-principle theoretical analyses of the optical properties. Both saturable absorption and reverse saturable absorption phenomena are observed due to multiphoton absorption effects. The analysis of these results adds to the understanding of the basic photophysical processes, which is anticipated to be beneficial for the further design of MXene-based devices.
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