检索结果-南通市图书馆

Performance Evaluation of Advanced Wave Energy Converters in the Nearshore Areas of the North Indian Ocean

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2022年第6期36卷 980-993页

作者： WAN Yong ZHANG Wen FAN Chen-qing li li-gang DAI Yong-shou The College of Oceanography and Space Informatics China University of PetroleumQingdao 266580China The Laboratory of Physical Oceanography and Remote Sensing The First Institute of OceanographySOAQingdao 266061China

The 21st Century Maritime Silk Road is a profound measure for mankind,whilst its development is severely restricted by the energy shortage of surrounding *** the core construction area of Maritime Silk Road,the North Indian Ocean is rich in wave *** development and utilization of wave energy not only can overcome energy shortage,but also promote communication between peripheral ***,previous researchers often focused on wave energy itself,without combining devices to analyze wave energy ***,we conducted an overall assessment of wave energy resources using 20-year ERA5 data and determined the sites considered as superior for the construction of Wave Energy Farm(WEF)in the coastal *** order to point out which type of Wave Energy Converter(WEC)is best suited for the sites,we carried out the performance evaluation of eight advanced WECs using three parameters:the mean power output,the capacity factor and the capture width *** results show that the performance of Wave Star is superior to other devices,which is supposed to be the primary consideration of the Wave Energy Farms(WEFs)in the future.

关键词： ocean energy wave energy characteristics site selection wave energy converter performance evaluation

Differential physiological responses of the coastal cyanobacterium Synechococcus sp. PCC7002 to elevated pCO2 at lag, exponential,and stationary growth phases

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2018年第10期61卷 1397-1405页

作者： Shanli MOU gang li Hongmei li Fazhong li Zhisheng SHAO Jinsong li Changfeng QU Yongyu ZHANG Key Laboratory of Biofuels Shandong Provincial Key Laboratory of Energy Genetics Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301 China Zhanjiang Branch of China National Offshore Oil Corporation Ltd. Zhanjiang 524000 China Key Laboratory of Marine Bioactive Substance the First Institute of OceanographyState Oceanic AdministrationQingdao 266061 China

We studied the effects of expected end-of-the-century p CO_2(1000 ppm)on the photosynthetic performance of a coastal marine cyanobacterium Synechococcus ***7002 during the lag,exponential,and stationary growth *** p CO_2significantly stimulated growth,and enhanced the maximum cell density during the stationary *** ambient p CO_2conditions,the lag phase lasted for 6 days,while elevated p CO_2shortened the lag phase to two days and extended the exponential phase by four *** elevated p CO_2increased photosynthesis levels during the lag and exponential phases,but reduced them during the stationary ***,the elevated p CO_2reduced the saturated growth light(Ik)and increased the light utilization efficiency(α)during the exponential and stationary phases,and elevated the phycobilisome:chlorophyll a(Chl a)***,the elevated p CO_2reduced the particulate organic carbon(POC):Chl a and particulate organic nitrogen(PON):Chl a ratios during the lag and stationary phases,but enhanced them during the exponential ***,Synechococcus showed differential physiological responses to elevated p CO_2during different growth phases,thus providing insight into previous studies that focused on only the exponential phase,which may have biased the results relative to the effects of elevated p CO_2in ecology or aquaculture.

关键词： Elevated pCO2 Lag Exponential and stationary phases Photosynthetic performance Synechococcus

Development of Near Infrared Spectroscopy for Rapid Quality Assessment of Red Ginseng

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第5期25卷 633-637页

作者： NIE li-xing WANG gang-li liN Rui-chao National Institute for the Control of Pharmaceutical and Biological Products Beijing 100050 P. R. China

Near infrared spectroscopy（NIRS） was developed as a rapid analysis method for the qualitative and quantitative assessment of the quality of red ginseng. Discriminant analysis（DA） based on principal component analysis and Mahalanobis distance was used to distinguish red ginseng from counterfeits non-destructively. The result shows that the proposed method could distinguish red ginseng from counterfeits correctly and no misclassified sample was found in both training and test sets. The partial least squares（PLS） algorithm was used to predict the sum of ginsenosides Re and Rgl and the content of ginsenoside Rb1. Two calibration models were developed to correlate NIR spectra with the reference values determined by HPLC method. The correlation coefficient（R）, the root mean square error of calibration（RMSEC） and the root mean square error of prediction（RMSEP） were as follows： R=0.9827, RMSEC=0.0163%, RMSEP=0.0250% for the sum of ginsenosides Re and Rgl; R=0.9869, RMSEC=0.0156%, RMSEP=0.0256% for content of ginsenoside Rb1. The overall results demonstrate that NIRS coupled with chemometrics could be successfully applied as a rapid, precise and cost-effective method not only to identify the red ginseng from counterfeits but also to determine simultaneously some chemical compositions in red ginseng.

关键词： Near infrared soectroscopy Red ginseng Discriminant analysis Partial least squares

Human β-defensin 2 enhances IL-1β production and pyroptosis through P2X7-mediated NLRP3 expression in macrophages

在线全文

学校读者我要写书评

暂无评论

BIOCELL 2022年第5期46卷 1197-1207页

作者： PANPAN WANG gang li li GAO CHUANJIANG ZHAO Department of Periodontology Guanghua School and Hospital of StomatologySun Yat-sen UniversityGuangzhouChina Guangdong Provincial Key Laboratory of Stomatology Guanghua School and Hospital of StomatologySun Yat-sen UniversityGuangzhouChina Department of Oral Implantology Delun DentalGuangzhouChina

Periodontal disease is the leading cause of tooth loss,which is also a high-risk factor for other diseases including oral cancer and cardiovascular *** is one of the most common type of periodontal ***-1β(IL-1β)plays a key role in the pathogenesis of ***,the mechanism how IL-1βis produced during periodontitis is still *** the present study,we found that humanβ-defensin 2(hBD2)enhances IL-1βproduction through an LPS-primed human acute monocytic leukemia(THP-1)macrophage *** of P2X purinoceptor 7(P2X7)reduced hBD2-enhanced IL-1β*** of LPS-primed THP-1 macrophages with potassium chloride also suppressed hBD2-enhanced IL-1β*** of inflammasome adaptor Nod-like receptor family pyrin domain containing 3(NLRP3)led to reduced hBD2-enhanced IL-1β***,inhibition of caspase-1 also resulted in the decrease of IL-1β.Moreover,an ethidium bromide uptake test indicated that hBD2-activated caspase-1 mediated pyroptotic pore *** lactate dehydrogenase detection and flow cytometric analysis indicated that hBD2 also induced *** brief,these findings illustrated not only the mechanism of hBD2 in enhancing the inflammatory response,but also provided novel therapeutic targets for periodontitis.

关键词： Periodontitis Humanβ-defensin 2 IL-1β Signal transduction Pyroptosis

Revealing Al-O/Al-F reaction dynamic effects on the combustion of aluminum nanoparticles in oxygen/fluorine containing environments:A reactive molecular dynamics study meshing together experimental validation

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

Defence Technology（防务技术） 2024年第4期34卷 313-327页

作者： gang li Chuande Zhao Qian Yu Fang Yang Jie Chen Institute of Chemical Materials China Academy of Engineering Physics(CAEP)P.O.Box 919-311Mianyang 621900SichuanChina

Improving the energy conversion efficiency in metallic fuel(e.g.,Al)combustion is always desirable but challenging,which often involves redox reactions of aluminum(Al)with various mixed oxidizing *** instance,Al-O reaction is the most common pathway to release limited energy while Al-F reaction has received much attentions to enhance Al combustion ***,microscopic understanding of the Al-O/Al-F reaction dynamics remains unsolved,which is fundamentally necessary to further improve Al combustion *** this work,for the first time,Al-O/Al-F reaction dynamic effects on the combustion of aluminum nanoparticles(n-Al)in oxygen/fluorine containing environments have been revealed via reactive molecular dynamics(RMD)simulations meshing together combustion *** RMD simulation systems of Al core/O_(2)/HF,n-Al/O_(2)/HF,and n-Al/O_(2)/CF4 with oxygen percentage ranging from 0%to 100%have been *** n-Al combustion in mixed O_(2)/CF_4 environments have been conducted by constant volume combustion *** results show that Al-O reaction exhibits kinetic benefits while Al-F reaction owns thermodynamic benefits for n-Al *** n-Al/O_(2)/HF,Al-O reaction gives faster energy release rate than Al-F reaction(1.1 times).The optimal energy release efficiency can be achieved with suitable oxygen percentage of 10%and 50%for n-Al/O_(2)/HF and n-Al/O_(2)/CF_4,*** combustion experiments,90%of oxygen percentage can optimally enhance the peak pressure,pressurization rate and combustion ***,Al-O reaction prefers to occur on the surface regions while Al-F reaction prefers to proceed in the interior regions of n-Al,confirming the kinetic/thermodynamic benefits of Al-O/Al-F *** synergistic effect of Al-O/Al-F reaction for greatly enhancing n-Al combustion efficiency is demonstrated at atomicscale,which is beneficial for optimizing the combustion performance of metallic fuel.

关键词： Al-O/Al—F reaction Kinetic benefits Thermodynamic benefits Molecular dynamics Combustion

Density-based ship detection in SAR images:Extension to a self-similarity perspective

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第3期37卷 168-180页

作者： Xueqian WANG gang li Zhizhuo JIANG Yu liU You HE Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

Nonlocal self-similarity is an important property of Synthetic Aperture Radar(SAR)images to characterize the repetitiveness of features embodied by SAR images within nonlocal areas and has been used for enhancement of SAR *** SAR ship detectors often independently handle small sub-images cropped from a large marine SAR image and do not exploit the nonlocal self-similarity *** this paper,we propose a new ship detector from the perspective of nonlocal self-similarity in SAR images to improve the ship detection performance,basically including three stages:prescreening,intra-cue calculation,and inter-cue *** the prescreening stage,we design a new Histogram-based Density(HD)feature to rapidly select candidate sub-images potentially containing ship targets from a large SAR *** the intra-cue calculation stage,target cues within a single candidate sub-image are *** the inter-cue calculation stage,thanks to the nonlocal self-similarity among different candidate sub-images in terms of density features,we innovatively extract a weighted superpixel-HD map to obtain accumulated intracues across all the candidate ***,for each candidate sub-image,we fuse its inter-cue and intra-cue to obtain final detection *** results based on real SAR images show that our newly proposed method provides a better target-to-clutter contrast and ship detection performance than those of other state-of-the-art detection approaches.

关键词： Ship detection Synthetic aperture radar(SAR) Density Self-similarity Histogram

Enhance hydrates formation with stainless steel fiber for high capacity methane storage

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第10期50卷 435-443页

作者： Zhixia Deng Shuanshi Fan Yanhong Wang Xuemei Lang gang li School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research Center of Advanced Insulating Coating Zhuhai 519175China Institute of Modern Industrial Innovation South China University of TechnologyZhuhai 519175China Key Laboratory of Fuel Cell Technology of Guangdong Province Guangzhou 510640China

In order to realize efficient gas storage of hydrate,stainless steel fiber(SSF)was added to 0.03%(mass)sodium dodecyl sulfate(SDS)solution for gas storage *** can not only improve the problem that hydration heat cannot be removed effectively in the hydration process,but also improve gas storage speed and gas storage by increasing hydrate nucleation *** the experimental conditions(273.2 K,5-9 MPa),the peaks of temperature rise in SDS+SSF systems were found to become much smaller than those in SDS *** maximum gas storage rate and the maximum methane uptake of SSF+SDS system reached 9.89-24.90 cm^(3)·g^(-1)·min^(-1) and 178.65-200.89 cm^(3)·(g H_(2)O)-1,*** with the surfactant SDS solution without SSF,they increased by 10.47%-33.22%and 9.16%-25.36%,*** effect of SSF length on gas storage performance was *** to the continuous thermal conduction network,longer SSF showed a higher gas storage capacity and methane uptake rate compared with shorter *** the same time,compared with other metal fillers,SSF+SDS not only had excellent gas storage performance,but also the amount of SSF(0.1 g·ml^(-1))was only 7.6%of foamed aluminum,and the volume gas storage density was increased by 145.4%.The use of stainless steel fiber made the best use of the thermal conductivity of metal,reduced the amount of metal used,and improved the volume density and mass density of gas storage.

关键词： Methane Stainless steelfiber Gas storagecapacity Hydrate Gas storagerate Heat transfer

Observation-Driven Multiple UAV Coordinated Standoff Target Tracking Based on Model Predictive Control

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2022年第6期27卷 948-963页

作者： Shun Sun Yu liu Shaojun Guo gang li Xiaohu Yuan Department of Control Science and Technology Naval Aviation UniversityYantai 264001China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China National Institute of Defense Technology Innovation Academy of Military Sciences PLABeijing 100091China Department of Automation Tsinghua UniversityBeijing 100084China

An observation-driven method for coordinated standoff target tracking based on Model Predictive Control(MPC)is proposed to improve observation of multiple Unmanned Aerial Vehicles(UAVs)while approaching or loitering over a *** acquiring a fusion estimate of the target state,each UAV locally measures the observation capability of the entire UAV system with the Fisher Information Matrix(FIM)determinant in the decentralized *** facilitate observation optimization,only the FIM determinant is adopted to derive the performance function and control constraints for coordinated standoff ***,a modified iterative scheme is introduced to improve the iterative efficiency,and a consistent circular direction control is established to maintain long-term observation performance when the UAV approaches its *** experiments with simulated and real trajectories validate that the proposed method can improve observation of the UAV system for target tracking and adaptively optimize UAV trajectories according to sensor performance and UAV-target geometry.

关键词： coordinated tracking standoff tracking observation-driven Model Predictive Control(MPC) multiple UAVs Fisher Information Matrix(FIM)

Inverted Y ureteral duplication with an ectopic ureter and multiple urinary calculi:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第4期10卷 1326-1332页

作者： Wen-Xin Ye li-gang Ren li Chen Department of Urology Tongde Hospital of Zhejiang ProvinceHangzhou 310000Zhejiang ProvinceChina

BACKGROUND In the clinical treatment of diseases related to ureteral duplication,it is very important to make a clear diagnosis before surgery because different types of ureteral duplication correspond to different treatment *** Y ureteral duplication with ectopic ureters and multiple urinary calculi is clinically *** case can help clinicians increase their understanding of this disease and gain some experience in its diagnosis and *** SUMMARY A 36-year-old male who was previously healthy presented to the hospital with lumbar *** of the right kidney area showed the patient had *** tomography scans revealed multiple urinary calculi in the right urinary *** tomography urography revealed a duplicated ureteral malformation with an ectopic ureter.A transurethral ureteroscopic holmium laser lithotripsy was performed *** retrograde ureterography was performed,and the ectopic ureter was *** informed the family of the intraoperative findings and suggested laparoscopic ectopic ureterectomy for the ectopic ureteral ***,the family temporarily refused laparoscopic *** patient did not feel any discomfort after one year of *** Inverted Y ureteral duplication with an ectopic ureter and multiple urinary calculi is *** must be highly vigilant,make a correct diagnosis before surgery,determine the type of ureteral duplication and the distribution of urinary calculi,and then draw up a reasonable treatment plan to avoid unnecessary complications.

关键词： Ureteral duplication Inverted Y Ectopic ureter Urinary calculi Case report