| 1. |
- Fenstermacher, M.E., et al.
(författare)
-
DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy
- 2022
-
Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 62:4
-
Tidskriftsartikel (refereegranskat)abstract
- DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, coupled with fundamental plasma physics understanding and model validation, to drive scenario development by integrating high performance core and boundary plasmas. Substantial increases in off-axis current drive efficiency from an innovative top launch system for EC power, and in pressure broadening for Alfven eigenmode control from a co-/counter-I p steerable off-axis neutral beam, all improve the prospects for optimization of future long pulse/steady state high performance tokamak operation. Fundamental studies into the modes that drive the evolution of the pedestal pressure profile and electron vs ion heat flux validate predictive models of pedestal recovery after ELMs. Understanding the physics mechanisms of ELM control and density pumpout by 3D magnetic perturbation fields leads to confident predictions for ITER and future devices. Validated modeling of high-Z shattered pellet injection for disruption mitigation, runaway electron dissipation, and techniques for disruption prediction and avoidance including machine learning, give confidence in handling disruptivity for future devices. For the non-nuclear phase of ITER, two actuators are identified to lower the L-H threshold power in hydrogen plasmas. With this physics understanding and suite of capabilities, a high poloidal beta optimized-core scenario with an internal transport barrier that projects nearly to Q = 10 in ITER at ∼8 MA was coupled to a detached divertor, and a near super H-mode optimized-pedestal scenario with co-I p beam injection was coupled to a radiative divertor. The hybrid core scenario was achieved directly, without the need for anomalous current diffusion, using off-axis current drive actuators. Also, a controller to assess proximity to stability limits and regulate β N in the ITER baseline scenario, based on plasma response to probing 3D fields, was demonstrated. Finally, innovative tokamak operation using a negative triangularity shape showed many attractive features for future pilot plant operation.
|
|
| 2. |
- Hou, R. -Q, et al.
(författare)
-
Localized corrosion of binary Mg-Ca alloy in 0.9 wt% sodium chloride solution
- 2016
-
Ingår i: Acta Metallurgica Sinica (English Letters). - : Chinese Society for Metals. - 1006-7191 .- 2194-1289. ; 29:1, s. 46-57
-
Tidskriftsartikel (refereegranskat)abstract
- To further understand the localized corrosion of magnesium alloy, various in situ electrochemical techniques and ex situ electron microprobe analysis and SEM were used to monitor the corrosion process of Mg-1.0Ca alloy in 0.9 wt% sodium chloride solution. The results indicated that the localized corrosion was accompanied by the formation and thickening of a corrosion product film on the Mg-1.0Ca alloy. A localized corrosion of the alloy initiated selectively on the eutectic micro-constituent zones, then enhanced with the exposure, developed in depth with ring-shaped corrosion products accumulated around and finally formed a volcanic-like pitting. Based on the measurements, an electrochemical corrosion model was proposed accordingly to describe the formation mechanism of the volcanic-like pitting on the alloy in 0.9 wt% sodium chloride solution.
|
|
| 3. |
- Shao, Wen-ZE, et al.
(författare)
-
Gradient-based discriminative modeling for blind image deblurring
- 2020
-
Ingår i: Neurocomputing. - : Elsevier BV. - 0925-2312 .- 1872-8286. ; 413, s. 305-327
-
Tidskriftsartikel (refereegranskat)abstract
- Blind image deconvolution is a fundamental task in image processing, computational imaging, and computer vision. It has earned intensive attention in the past decade since the seminal work of Fergus et al. [1] for camera shake removal. In spite of the recent great progress in this field, this paper aims to formulate the blind problem with a simpler modeling perspective. What is more important, the newly proposed approach is expected to achieve comparable or even better performance towards the real blurred images. Specifically, the core critical idea is the proposal of a pure gradient-based discriminative prior for accurate and robust blur kernel estimation. Numerous experimental results on both the benchmark datasets and real-world blurred images in various imaging scenarios, e.g., natural, manmade, low-illumination, text, or people, demonstrate well the effectiveness and robustness of the proposed approach.
|
|
| 4. |
- Hu, H. -Q, et al.
(författare)
-
Research progress of single layer fuel cell
- 2017
-
Ingår i: Xiandai Huagong/Modern Chemical Industry. - : China National Chemical Information Center. - 0253-4320. ; 37:2, s. 31-35 and 37
-
Tidskriftsartikel (refereegranskat)abstract
- The definition, working principle and the superior performance of single layer fuel cell are briefly introduced. The latest achievement and research progress in this field are summarized, which lay a foundation for the next development of single layer fuel cell.
|
|
| 5. |
- Cai, Yangjian, et al.
(författare)
-
Coincidence subwavelength fractional Fourier transform
- 2006
-
Ingår i: Optical Society of America. Journal A. - 1084-7529 .- 1520-8532. ; 23:4, s. 835-841
-
Tidskriftsartikel (refereegranskat)abstract
- The coincidence subwavelength fractional Fourier transforms (FRTs) with entangled photon pairs and incoherent light radiation are introduced as an extension of the recently introduced coincidence FRT. Optical systems for implementing the coincidence subwavelength FRTs are designed. The width of the coincidence subwavelength FRT pattern is two times narrower than the width of the coincidence FRT. The coincidence subwavelength FRT with partially coherent light radiation is also studied numerically. Differences between the coincidence subwavelength FRT with entangled photon pairs and that with incoherent light radiation are discussed.
|
|
| 6. |
- Liu, Wei, 1987-, et al.
(författare)
-
Simplifying the geometry of an airliner cabin for CFD simulations
- 2011
-
Ingår i: 12th International Conference on Indoor Air Quality and Climate 2011. - 9781627482721 ; , s. 198-203
-
Konferensbidrag (refereegranskat)abstract
- To study air distribution in commercial aircraft cabins so as to analyze their indoor air quality and thermal comfort, Computational Fluid Dynamics (CFD) has been frequently used. This study obtained a detailed geometric model by a laser tracking system with reverse engineering for the first-class section of an MD-82 aircraft cabin. By performing CFD simulations for the geometric model with different simplifications and by comparing the numerical results, the differences caused by the simplifications could be estimated. Our numerical simulations used the RNG k-ε model to solve the air distributions. This study concluded that some cabin geometries, such as the windows and seats, can be greatly simplified. Simplification could significantly reduce the grid number that makes the simulations faster.
|
|
| 7. |
- Lu, Z., et al.
(författare)
-
26.8 m 350 GHz wireless transmission of beyond 100 Gbit/s supported by THz photonics
- 2019
-
Ingår i: Asia Communications and Photonics Conference, ACP. - : OSA - The Optical Society.
-
Konferensbidrag (refereegranskat)abstract
- A THz photonic wireless communication system with a record transmission of 100.8 Gbit/s over 26.8 m distance operating at 350 GHz is experimentally demonstrated without any THz amplifications. The probabilistic shaped 16-QAM-OFDM and advanced nonlinear digital signal processing routine are employed. Asia Communications and Photonics Conference (ACP).
|
|
| 8. |
- Feng, Zhenhua, et al.
(författare)
-
SNR equalized optical direct-detected OFDM transmission with CAZAC equalization
- 2015
-
Ingår i: CLEO. - : Optica Publishing Group.
-
Konferensbidrag (refereegranskat)abstract
- 50Km SSMF optical direct-detected OFDM transmission with Constant Amplitude Zero Auto Correlation Sequence (CAZAC) equalization is experimentally demonstrated with over 15dB power budget. 2.5dB enhancement in sensitivity has been achieved simultaneously with 3dB PAPR suppression.
|
|
| 9. |
- Feng, Z., et al.
(författare)
-
Spectrally overlaid DDO-OFDM transmission enabled by optical power division multiplexing
- 2017
-
Ingår i: ICOCN 2016 - 2016 15th International Conference on Optical Communications and Networks. - : IEEE. - 9781509034918
-
Konferensbidrag (refereegranskat)abstract
- Two 8.3-Gb/s spectrally overlaid DDO-OFDM signals are successfully transmitted along 50-km SMF using optical power division multiplexing and received by a successive interference cancellation (SIC) receiver. Spectral efficiency is doubled with optimized optical modulation index and optical power division ratio.
|
|
| 10. |
- Hou, R. -Q, et al.
(författare)
-
Corrosion inhibition of pre-formed mussel adhesive protein (Mefp-1) film to magnesium alloy
- 2020
-
Ingår i: Corrosion Science. - : Elsevier Ltd. - 0010-938X .- 1879-0496. ; 164
-
Tidskriftsartikel (refereegranskat)abstract
- A range of ex situ and in situ analytical techniques were applied to gain insights into the formation and properties of the pre-formed Mefp-1 film on magnesium-1.0 wt.% calcium (Mg-1.0Ca) alloy. The results revealed that the Mefp-1 film pre-formed at pH 4.6 shows a net-like structure, whereas it is more packed at pH 8.5. in situ scanning micro-reference electrode technique results demonstrated the Mefp-1 films formed at both pH can effectively inhibit the localised corrosion of Mg-1.0Ca alloy. Moreover, the film pre-formed at pH 4.6 provides an increasing corrosion inhibition to Mg-1.0Ca alloy during 7 days of exposure.
|
|
