检索结果-南通市图书馆

Dynamical analysis of mesoscale eddy-induced ocean internal waves using linear theories

在线全文

学校读者我要写书评

暂无评论

Acta oceanologica Sinica 2008年第3期27卷 60-69页

作者： XU Qing ZHENG Quanan LIN Hui LIU Yuguang SONG Y Tony yuan yeli Institute of Space and Earth Information Science The Chinese University of Hong Kong Hong Kong China department of Atmospheric and oceanic Science University of Maryland College Park Maryland USA Physical oceanography Laboratory Ocean University of China Qingdao 266100 China Jet Propulsion Laboratory California Institute of Technology Pasadena California USA Key Laboratory for Marine Science and Numerical Modeling of State oceanic Administration First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

This study aims to explore generation mechanisms of the ocean internal wave using the dynamical analysis methods based on linear theories. Historical cruise measurements and recent synthetic aperture radar （SAR） observations of mesoscale eddies with diameter of several tens of kilometers to hundreds of kilometers show that the internal wave packets with wavelength of hundreds of meters to kilometer exist inside the mesoscale eddies. This coexistence phenomenon and inherent links between the two different scale processes are revealed in the solutions of governing equations and boundary conditions for the internal wave disturbance with a horizontally slowly variable amplitude in a cylindrical coordinate system. The theoretical solutions indicate that the instability of eddy current field provides the dynamical mechanism to internal wave generation. The derived dispersion relation indicates that the internal wave propagation is modified by the eddy current field structure. The energy equation of the internal waves clearly shows the internal wave energy increment comes from the eddy. The theoretical models are used to explain the observation of the mesoscale eddy-induced internal waves off the Norwegian coast. The two-dimensional waveform solution of the anticyclonic eddy-induced internal wave packet appears as ring-shaped curves, which contains the typical features of eddy stream lines. The comparison of theoretical solutions to the structure of the internal wave packets on SAR image shows a good agreement on the major features.

关键词： ocean internal waves mesoscale eddy current field instability SAR image

Statistical model on the surface elevation of waves with breaking

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2008年第5期51卷 759-768页

作者： yuan yeli HUA Feng Z{2.G ShuWen {2. lei Marine Science and Numerical Modeling Laboratory SOAQingdao 266061China First Institute of oceanography SOAQingdao 266061China South china Sea environmental Institute Guangdong Ocean UniversityZhanjiang 524088China

In the surface wind drift layer with constant momentum flux, two sets of the consistent surface eleva- tion expressions with breaking and occurrence conditions for breaking are deduced from the first in- tegrals of the energy and vortex variations and the kinetic and mathematic breaking criterions, then the expression of the surface elevation with wave breaking is established by using the Heaviside function. On the basis of the form of the sea surface elevation with wave breaking and the understanding of small slope sea waves, a triple composite function of real sea waves is presented including the func- tions for the breaking, weak-nonlinear and basic waves. The expression of the triple composite func- tion and the normal distribution of basic waves are the expected theoretical model for surface elevation statistics.

关键词： first integrals for energy and vortex variations in wind drift layer kinetic and mathematic wave breaking criterions triple composite function of the real sea waves normal distribution of the basic waves

Modeling of the eddy viscosity by breaking waves

在线全文

学校读者我要写书评

暂无评论

Acta oceanologica Sinica 2007年第6期26卷 116-123页

作者： ZhanG Shuwen yuan {2. ZHENG Quan＇ an South china Sea environmental Institute Guangdong Ocean University Zhanjiang 524088 China Key Laboratory of Marine Science and Numerical Modeling of State oceanic Administration First Institute of Oceanography State Oceanic Administration Qingdao 266061 China department of Meteorology Maryland University Maryland 20742 USA

Breaking wave induced nearsurface turbulence has important consequences for many physical and biochemical processes including water column and nutrients mixing, heat and gases exchange across air-sea interface. The energy loss from wave breaking and the bubble plume penetration depth are estimated. As a consequence, the vertical distribution of the turbulent kinetic energy （TKE）, the TKE dissipation rate and the eddy viscosity induced by wave breaking are also provided. It is indicated that model results are found to be consistent with the observational evidence that most TKE generated by wave breaking is lost within a depth of a few meters near the sea surface. High turbulence level with intensities of eddy viscosity induced by breaking is nearly four orders larger than vw1（ = κu ＊wz）, the value predicted for the wall layer scaling close to the surface, where u ＊w is the friction velocity in water, κ with 0. 4 is the yon Kármán constant, and z is the water depth, and the strength of the eddy viscosity depends both on wind speed and sea state, and decays rapidly through the depth. This leads to the conclusion that the breaking wave induced vertical mixing is mainly limited to the near surface layer, well above the classical values expected from the similarity theory. Deeper down, however, the effects of wave breaking on the vertical mixing become less important.

关键词： air-sea interface near-surface dynamics TKE dissipation rate eddy viscosity

Anti-oxidant and anti-inflammatory activities of ultrasonicassistant extracted polyphenol-rich compounds from Sargassum muticum

在线全文

学校读者我要写书评

暂无评论

Journal of oceanology and Limnology 2019年第3期37卷 836-847页

作者： YU yuan WANG Le FU Xiaoting WANG lei FU Xiaodan YANG Min {2. Zhenlian MOU Haijin JEON You-Jin College of Food Science and Engineering Ocean University of ChinaQingdao 266003China department of Marine Life Sciences Jeju National UniversityJeju 63243Republic of Korea

Polypehnol is an important,potentially bioactive component of Sargassum *** this study,ultrasonic assisted extraction of polyphenol-rich substances was performed using a 38%ethanol solution at a solid:liquid ratio of 1:30 at 68℃ for 32.in,determined by single-factor and response surface methodology(RSM)*** content of polyphenol was 5.66mg/g in the crude *** extraction showed that the polyphenol mainly distributed in ethyl acetate(SKEE)and water phases(SKEW).The anti-oxidation test by electron spin resonance(ESR)spectrum showed that the SKEE had the strongest scavenging activity on DPPH(1,1-diphenyl-2.picrylhydrazyl)and alkyl *** was shown noncytotoxic but could inhibit the generation of cellular ROS,showing protective effects in H2.2.and AAPHinduced Vero cells and UV-B irradiated HaCaT *** also signifi cantly inhibited the release of NO of LPS-induced RAW 2.4.7 ***,the polyphenol-rich extracts in ethanol and ethyl acetate showed excellent anti-oxidant and anti-infl ammatory activities,which is beneficial to the development of high-value bio-substances.

关键词： Sargassum muticum polyphenol extraction ESR anti-oxidant anti-inflammatory

Bi_(2.O_(2.Se nanoplates for broadband photodetector and full-color imaging applications

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 7638-7645页

作者： han Wang Songqing Zhang Xingxuan Wu Huijia Luo Junliang Liu Zesheng Mu Ruirui Liu Guang {2. Yujun Liang Jin Tan Yongling Ren Wen lei department of Electrical Electronic and Computer EngineeringThe University of Western AustraliaCrawley 6009Australia department of Electronic Engineering School of IOT engineeringJiangnan UniversityWuxi 214122China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China

Broadband light detection and sensing are widely applied in modern *** a promising candidate for next-generation two-dimensional(2.)optoelectronic material,bismuth oxyselenide(Bi_(2.O_(2.Se)nanoplates exhibit many prospects in the application of visible light detection due to their peculiar *** this work,we report the photodetection performance of single-crystal 2. Bi_(2.O_(2.Se nanoplates grown on SiO_(2.based on a ternary-alloy growth model by utilizing chemical vapor deposition(CVD).The Bi_(2.O_(2.Se nanoplates were found to have an even and uniform square shape with side lengths up to 15μm and an approximate thickness of 15 nm.A visible-light photodetector was fabricated based on a CVD-grown Bi_(2.O_(2.Se nanoplate,and characterized by a set of illumination experiments using a 400 nm laser at temperatures ranging from 77 to 370 *** device exhibited superior performance at the temperature of 77 K,with a responsivity of 52. A/W,a specific detectivity of 1.37×10^(11)Jones,a response time of 0.2.75 ms,an external quantum efficiency of 162.119.44%,resulting in high-quality and fullcolor imaging in the visible *** results indicate that the single-crystalline Bi_(2.O_(2.Se nanoplates have excellent potential in broadband photodetection and non-cryogenic imaging.

关键词： two-dimensional(2.)nanomaterial Bi_(2.O_(2.Se nanoplates chemical vapor deposition broadband light detection full-color imaging

Protective effect of nitric oxide on hepatopulmonary syndrome from ischemia-reperfusion injury

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第25期18卷 3310-3316页

作者： Tong-Jin Diao, Xin Chen Li-Hua Deng, han-Xiang ChenI Yan Liang Xiao-Dong Zhao Qing-Hua Wang, Wei-Sheng yuan Bai-Chun Gao Yong Ye department of Hepatobiliary Surgery and LiverTransplant Center Jinan Military Region The Chinese PLA401 st Hospital Qingdao 266071 Shandong Province China department of Emergency The People's Hospital ofChengyang District Qingdao 266109 Shandong Province ChinaI_i-Hua Deng Central Injection Room Qingdao Municipal Hos-pital Qingdao 266011 Shandong Province China Central Injection Room Qingdao Municipal Hos-pital Qingdao 266011 Shandong Province China Institute of-Pathogenic Biology School ofMedicine Shandong University Jinan 250012 Shandong Prov-ince China College of Marine Life Sciences Ocean Universityof China Qingdao 266003 Shandong Province China department of General Surgery Jinan MilitaryRegion the Chinese PLA 401st Hospital Qingdao 266071 Shan-dong Province China

AIM： To evaluate immunological protection of nitric ox- ide （NO） in hepatopulmonary syndrome and probable mechanisms of ischemia-reperfusion （IR） injury in rat liver transplantation, METHODS： Sixty-six healthy male Wistar rats were randomly divided into three groups （11 donor/recipi-ent pairs）. In group 11, organ preservation solution was lactated Ringer＇s solution with heparin 10 000/μL at 4℃. In groups I and 111, the pLeservation solution added, respectively, L-arginine or Ng-L-arginine methyl ester （L-NAME）（1 mmol/L） based on group 11, and recipients were injected with L-arginine or L-NAME （50 mg/kg） in the anhepatic phase. Grafted livers in each group were stored for 6 h and implanted into recipi- ents. Five rats were used for observation of postopera- tive survival in each group. The other six rats in each group were used to obtain tissue samples, and execut- ed at 3 h and 2. h after transplantation. The levels of alanine aminotransferase （ALT）, tumor necrosis factor （TNF）-a and NO metabolites （NOx） were detected, and expression of NO synthase, TNF-α and intercellular adhesion molecule 1 （ICAM-1） was examined by tri- phosphopyridine nucleotide diaphorase histochemical and immunohistochemical staining. RESULTS： By supplementing L-arginine to strengthen the NO pathway, a high survival rate was achieved and hepatic function was improved. One-week sur- viral rate of grafted liver recipients in group I was significantly increased （2..8 4±36.6 d ys 4 4±1.7 d, P 〈 0.01） as compared with groups 11 and Ill. Serum levels of ALT in group ] were 2.7 times less than those in groups 11 and 11I （P 〈 0.01）. The cyclic guanosine monophosphate （cGMP） levels in liver tissue and NOx in group I were 3-4 times higher than those of group 11 after 3 h and 2. h reperfusion, while in group ]]], they were significantly reduced as compared with those in group ]1 （P 〈 0.01）. The levels of TNF-（z in group I were significantly lower than in group Ⅱ after 3 h and 2. h reperfusion （P 〈 0.01）,

关键词： Nitric oxide Nitric oxide synthase Immu-noregulatory Hepatopulmonary syndrome Ischemia-reperfusion injury Orthotopic liver transplantation