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A Force-Based Grid Manipulator for ALE Calculations in a Lobe Pump

2000年

作者： dick Steflik Prashant Sridharan.

来源：畅想之星图书光盘版（南... 评论

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Journal of Thermal Science 2003年第4期12卷 318-322,370页

作者： John Vande Voorde rug.ac.be Jan Vierendeels rug.ac.be Erik dick rug.ac.be Department of Flow Heat and Combustion Mechanics Ghent University Belgium E-mail: John.VandevoordeDepartment of Flow Heat and Combustion Mechanics Ghent University Belgium E-mail: John.VandevoordeDepartment of Flow Heat and Combustion Mechanics Ghent University Belgium E-mail: John.Vandevoorde

In this paper, a time-dependant calculation of flow in a lobe pump is presented. Calculations are performed using the arbitrary Lagrangean Eulerean (ALE) method. A grid manipulator is needed to move the nodes between time steps. The used grid manipulator is based on the pseudo-force idea. This means that each node is fictitiously connected with its 8 neighbours via fictitious springs. The equilibrium of the resulting pseudo spring forces defines the altered position of the nodes. The grid manipulator was coupled with a commercial flow solver and the whole was tested on the flow through a three-lobe lobe pump. Results were obtained for a rotational speed of 460 rpm and incompressible silicon oil as fluid.

关键词： ALE arbitrary Lagrangean Eulerean moving grids lobe pump.

A Comparative Study of the Effect of Gold Seed Particle Preparation Method on Nanowire Growth

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Nano Research 2010年第7期3卷 506-519页

作者： Maria E.Messing Karla Hillerich Jessica Bolinsson Kristian Storm Jonas Johansson Kimberly A.dick Knut Deppert Solid State Physics Lund UniversityBox 118S-22100 LundSweden Polymer&Materials Chemistry Lund UniversityBox 124S-22100 LundSweden

Highly controlled particle-assisted growth of semiconductor nanowires has been performed for many years,and a number of novel nanowire-based devices have been *** control of the epitaxial growth is required to optimize the performance of devices,and gold seed particles are known to provide the most controlled *** nanowire growth from gold particles generated and deposited by various different methods has been reported,but no investigation has yet been performed to compare the effects of gold particle generation and deposition methods on nanowire *** this article we present a direct comparative study of the effect of the gold particle creation and deposition methods on nanowire growth characteristics and nanowire crystal structure,and investigate the limitations of the different generation and deposition methods used.

关键词： Nanowire growth nanoparticles gold epitaxy electron microscopy

Supertranslations to All Orders

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Journal of Modern Physics 2010年第1期1卷 59-66页

作者： Rainer dick 不详

We calculate the transformation laws of the general linear superfield and chiral superfields under supertranslations to all orders in the translation parameters . We use the superfield formalism with complete expansions of the component fields in the coordinate shifts . The results show in particular how a general supertranslation transforms each component field of a supermultiplet into a complete superfield. The results also provide complete parametri-zations of orbits of component fields under supertranslations.

关键词： Supersymmetry Supermultiplets Supertranslations

Recent developments of neuroprotective agents for degenerative retinal disorders

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Neural Regeneration Research 2022年第9期17卷 1919-1928页

作者： Kepeng Ou Youjian Li Ling Liu Hua Li Katherine Cox Jiahui Wu Jian Liu Andrew D.dick College of Pharmacy National&Local Joint Engineering Research Center of Targeted and Innovative TherapeuticsIATTIChongqing University of Arts and SciencesChongqingChina Translational Health Sciences Bristol Medical SchoolUniversity of BristolBristolUK Department of Ophthalmology Yongchuan HospitalChongqing Medical UniversityChongqingChina Department of Ophthalmology Shanghai General Hospital(Shanghai First People’s Hospital)Shanghai Jiao Tong University School of MedicineShanghaiChina Institute of Ophthalmology University College LondonLondonUK National Institute for Health Research Biomedical Research Centre Moorfields Eye HospitalLondonUK

Retinal degeneration is a debilitating ocular complication characterized by the progressive loss of photoreceptors and other retinal neurons,which are caused by a group of retinal diseases affecting various age groups,and increasingly prevalent in the ***-related macular degeneration,diabetic retinopathy and glaucoma are among the most common complex degenerative retinal disorders,posing significant public health problems worldwide largely due to the aging society and the lack of effective *** pathoetiologies vary,if left untreated,loss of retinal neurons can result in an acquired degeneration and ultimately severe visual *** of underlined etiology,loss of neurons and supporting cells including retinal pigment epithelium,microvascular endothelium,and glia,converges as the common endpoint of retinal degeneration and therefore discovery or repurposing of therapies to protect retinal neurons directly or indirectly are under intensive *** review overviews recent developments of potential neuroprotectants including neuropeptides,exosomes,mitochondrial-derived peptides,complement inhibitors,senolytics,autophagy enhancers and antioxidants either still experimentally or in clinical *** treatments that possess direct or indirect neuroprotective properties would significantly lift the burden of visual handicap.

关键词： antioxidants autophagy enhancers complement inhibitors exosomes neuropeptides neuroprotective agents retinal degeneration senolytics

土壤化学特性、酶活性和产量对农业措施的敏感性研究

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植物营养与肥料学报 2021年第12期27卷 2105-2113页

作者：邵兴华 Richard dick 上饶师范学院生命科学学院江西上饶334001 School of Environment and Natural Resources The OhioState UniversityColumbusOH 43210USA

【目的】研究不同农业管理措施(耕作强度、施肥、轮作)对土壤化学特性、酶活性及产量的影响,为选择适合的、对农业管理措施敏感的土壤质量评价指标提供依据。【方法】2019年5月在霍伊特维尔(OHHO,始于1963年),伍斯特(OHWO,始于1962年),... 详细信息

【目的】研究不同农业管理措施(耕作强度、施肥、轮作)对土壤化学特性、酶活性及产量的影响,为选择适合的、对农业管理措施敏感的土壤质量评价指标提供依据。【方法】2019年5月在霍伊特维尔(OHHO,始于1963年),伍斯特(OHWO,始于1962年),亚当斯(ORAD,始于1992年)3个农业长期试验站分别采集了0—15 cm耕层土壤。在OHHO和OHWO试验站,分别在免耕(NT)、深耕(CT)、浅耕(MT)条件下设轮作(玉米–燕麦–苜蓿)、单作(玉米)处理;在ORAD试验站,分别在为NT、CT条件下,设不施肥、施肥(有、无覆盖物)处理。同年测定了土壤的pH、全氮、全碳、粘粒、砂粒、粉粒含量和β-葡萄糖苷酶、芳基硫酸酯酶、荧光素二乙酸酯活性。【结果】OHWO试验点不同处理间pH无显著差异。OHHO试验点玉米–燕麦–苜蓿轮作处理(COH)或玉米单作处理(CCC)与MT配合pH显著高于其他处理;ORAD试验点豆麦轮作、有覆盖物、施肥(PWY2),豆麦轮作、有覆盖物、不施肥(PWY)与NT配合(PWY2-NT、PWY-NT),及小麦–休闲的WFaNT与WFa-CT处理pH显著高于其他处理。耕作强度、作物轮作影响土壤pH,但pH没有一致的变化趋势,除PWY2-NT处理外施氮肥降低土壤pH。COH-NT、PWY2-NT、WFa2-NT处理全氮、全碳含量显著高于其他处理,说明轮作、免耕配合施肥显著提高土壤全氮、全碳含量;OHHO、OHWO试验点各处理间产量差异不显著,ORAD试验点产量的变化表明除了农业管理措施,产量还受病虫害或当季突发自然灾害的影响。3个试验点轮作配合免耕β-葡萄糖苷酶、芳基硫酸酯酶、荧光素二乙酸酯活性最高。在OHHO试验点β-葡萄糖苷酶可以区分轮作配合浅耕或深耕(COH-MT、COH-CT),单作配合免耕、浅耕、深耕(CCC-NT、CCC-MT、CCCCT)处理间的差异;在ORAD试验点可以区分豆麦轮作+覆盖物+施肥或不施肥分别配合免耕2个处理;区分麦–休闲+施肥或不施肥分别配合深耕2个处理间的差异,而全碳不能区分这些处理间的差异。β-葡萄糖苷酶与全氮、全碳、芳基硫酸酯酶相关性达5%或1%水平。【结论】对外来扰动的敏感性表现为β-葡萄糖苷酶活性>全碳>产量,以β-葡萄糖苷酶活性判断,免耕配合轮作是较为理想的提高土壤质量的农业管理措施。

关键词：土壤化学特性酶活性产量敏感性

CAIPIRINHA-accelerated T1w 3D-FLASH for small-bowel MR imaging in pediatric patients with Crohn's disease:assessment of image quality and diagnostic performance

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世界儿科杂志:英文版 2016年第4期12卷 455-462页

作者： Mengxia Li Anke dick Nicole Hassold Thomas Pabst Thorsten Bley Herbert Köstler Henning Neubauer Department of Radiation Oncology University Hospital Wuerzburg97080 WuerzburgGermany Department of Pediatrics University Hospital Wuerzburg97080 WuerzburgGermany Department of Diagnostic and Interventional Radiology University Hospital Wuerzburg97080 WuerzburgGermany

Background:The“Controlled Aliasing In Parallel Imaging Results In Higher Acceleration”(CAPIRINHA)technique greatly accelerates T1w 3D fast low angle shot(FLASH)scans while maintaining high image *** studied image quality and conspicuity of inflammatory lesions on CAIPIRINHA-accelerated imaging for pediatric small-bowel magnetic resonance imaging(MRI).Methods:Forty-four consecutive patients(mean 14±3 years,18 girls)underwent small-bowel MRI(MR enterography,MRE)at 1.5 T including diffusion-weighted imaging(DWI),contrast-enhanced CAIPIRINHA 3D-FLASH and standard 2D-FLASH ***’s disease(CD)was confirmed in 26 patients,18 patients served as *** blinded readings were performed for grading of image quality and conspicuity of CD lesions on CAIPIRINHA FLASH and standard FLASH images in comparison to a reference standard comprising imaging and endoscopic ***:CAIPIRINHA FLASH yielded significantly higher image quality with good inter-observer agreement(κ=0.68)and showed better visual delineation in 40%of the assessed bowel lesions,as compared to standard *** was full agreement for identification of CD patients between CAIPIRINHA and standard *** FLASH detected two small-bowel lesions that were not seen on standard *** revealed additional inflammatory lesions inconspicuous on contrast-enhanced *** showed an overall diagnostic accuracy of 93%.Conclusion:We present first evidence that CAIPIRINHA greatly accelerates T1w imaging in paediatric MRE without trade-off in image quality or lesion conspicuity and is thus preferable to standard FLASH imaging.

关键词： CAIPIRINHA Crohn's disease FLASH pediatrics small-bowel MRI

Petrogenesis and Mineralization of Two-Stage A-Type Granites in Jiuyishan,South China:Constraints from Whole-rock Geochemistry, Mineral Composition and Zircon U-Pb-Hf Isotopes

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 874-900页

作者： LIU Ye LAI Jianqing XIAO Wenzhou dick JEFFREY DU Rijun LI Shuanglian LIU Chaoyun WEN Chunhua YU Xiaohang Key Laboratory of Metaallogenic Prediction of Nonferrous Metals and Geological Enironment Monitoring Ministry of EducationCentral South UniversityChangsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Hunan Institute of Geological Survey Changsha 410116China College of Marine Science and Technology China University of GeosciencesWuhan 430074China

The Jiuyishan complex massif,located in the northern section of the Nanling region,is a combination of five plutons,namely,the Xuehuading,Jinjiling,Pangxiemu,Shaziling and Xishan ***-rock geochemistry,Imineral electron microprobe analysis,zircon U-Pb dating and Hf isotope analysis were carried out for the Jinjiling and Pangxiemu *** zircon U-Pb dating yields weighted mean ages of 152.9±0.9 Ma for the Jinjiling pluton and 151.7±1.5 Ma for the Pangxiemu pluton,with a narrow gap between *** Jinjiling and Pangxiemu plutons both have geochemical characteristics of high SiO2,Al2 O3,Na2 O,K2 O and low TiO2,MgO,CaO,P2 O5 contents,with intense depletions in Sr,Ba,Ti,Eu and enrichments in Ga,FeoOT and HFSE,and these characteristics reflect an A-type *** the Jinjiling to the Pangxiemu plutons,the mineral composition of mica changes from lepidomelane to zinnwaldite,with increases in F,Li2 O and Rb2 O *** mineral composition of zircon changes from low Zr/Hf to high Zr/Hf,with increasing HfO2,P2 O5 and UO2+ThO2+Y2 O3 *** mineral compositions of feldspar indicate that the Pangxiemu pluton contains more alkali feldspar than the Jinjiling *** whole-rock geochemistry and mineral compositions reveal a higher degree of differentiation for the Pangxiemu *** nearly uniformεHf(t)indicates the same source region for the two plutons:both were derived from partial melting of the lower crust,with small contributions of mantle *** addition,higher F,lower Nb/Ta and Zr/Hf ratios in the Pangxiemu Pluton suggest a closer relationship with the rare metal mineralization than for the Jinjiling pluton.

关键词： zircon U-Pb dating mineral composition A-type granite rare metal mineralization Jinjiling pluton Pangxiemu pluton

Numerical simulations of cellular detonation diffraction in a stable gaseous mixture

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Propulsion and Power Research 2016年第3期5卷 177-183页

作者： Jian Li Jianguo Ning Charles B.Kiyanda Hoi dick Ng State Key Laboratory of Explosion Science&Technology Beijing Institute of TechnologyBeijing 100081China Department of Mechanical and Industrial Engineering Concordia UniversityMontréalQCH3G 1M8Canada

In this paper,the diffraction phenomenon of gaseous cellular detonations emerging from a confined tube into a sudden open space is simulated using the reactive Euler equations with a two-step Arrhenius chemistry *** two-dimensional and axisymmetric configurations are used for modeling cylindrical and spherical expansions,*** chemical parameters are chosen for a stable gaseous explosive mixture in which the cellular detonation structure is highly *** mesh refinement(AMR)is used to resolve the detonation wave structure and its evolution during the *** numerical results show that the critical channel width and critical diameter over the detonation cell size are about 1371 and 2571,*** numerical findings are comparable with the experimental observation and confirm again that the critical channel width and critical diameter differ essentially by a factor close to 2,equal to the geometrical scaling based on front curvature *** unstable mixtures where instabilities manifested in the detonation front structure play a significant role during the transmission,the present numerical results and the observed geometrical scaling provide again evidence that the failure of detonation diffraction in stable mixtures with a regular detonation cellular pattern is dominantly caused by the global curvature due to the wave divergence resulting in the global decoupling of the reaction zone with the expanding shock front.

关键词： Detonations Diffraction Pulse detonation engine Stable mixture Adaptive mesh refinement(AMR)

Once Scorned as Elitist,GOLF NOW ENJOYS A MINI-BOOM IN CHINA

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China Today 1994年第7期43卷 49-50页

作者： dick HARRIS

ＯｎｃｅＳｃｏｒｎｅｄａｓＥｌｉｔｉｓｔ，ＧＯＬＦＮＯＷＥＮＪＯＹＳＡＭＩＮＩ－ＢＯＯＭＩＮＣＨＩＮＡＢｙＤＩＣＫＨＡＲＲＩＳＡＣＯＵＰＬＥｏｆｙｅａｒｓａｇｏ，ｗｈｉｌｅｗｏｒｋｉｎｇｉｎＣｈｉｎａ，Ｉｍｅｎｔｉｏ... 详细信息

ＯｎｃｅＳｃｏｒｎｅｄａｓＥｌｉｔｉｓｔ，ＧＯＬＦＮＯＷＥＮＪＯＹＳＡＭＩＮＩ－ＢＯＯＭＩＮＣＨＩＮＡＢｙＤＩＣＫＨＡＲＲＩＳＡＣＯＵＰＬＥｏｆｙｅａｒｓａｇｏ，ｗｈｉｌｅｗｏｒｋｉｎｇｉｎＣｈｉｎａ，ＩｍｅｎｔｉｏｎｅｄｔｏａＣｈｉｎｅｓｅｆｒｉｅ...

关键词： Once Scorned as Elitist,GOLF NOW ENJOYS A MINI-BOOM IN CHINA