检索结果-南通市图书馆

Line-feature-based SLAM Algorithm

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

自动化学报 2006年第1期32卷 43-46页

作者： HAN rui LI Wen-feng Department of Logistic Engineering Wuhan University of Technology Wuhan 430063

A line-feature based SLAM algorithm is presented in this paper to resolve the conflict between the requirements of computational complexity and information-richness within the point-feature based SLAM algorithm, All operations required for building and maintaining the map, such as model-setting, data association, and state-updating, are described and formulated. This approach has been programmed and successfully tested in the simulation work, and results are shown at the end of this paper.

关键词：线性特征 SLAM算法复杂度数据关联

The effect of artificial solar spectrum on growth of cucumber and lettuce under controlled environment

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第8期19卷 2027-2034页

作者： ZOU Jie ZHOU Cheng-bo XU Hong CHENG rui-feng YANG Qi-chang LI Tao Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Sonneteck Technology Co. Ltd.Xiamen 361000P.R.China

Light-emitting diodes(LEDs)have been widely applied in the controlled environment agriculture,which are characterized by relatively narrow-band spectra and energetical *** recently,the spectrum of Sunlike LEDs has been engineered and it closely resembles solar spectrum in the range of photosynthetic active radiation(PAR,400–700 nm).To investigate how plant growth responses to the spectrum of Sunlike LEDs,cucumber and lettuce plants were cultivated and their responses were compared with the conventional white LEDs as well as composite of red and blue LEDs(RB,R/B ratio was 9:1).We observed that although Sunlike LEDs resulted in a longer stem in cucumber,dry weight and leaf area were similar as those under RB LEDs,and significantly higher than those under white ***,cucumber leaves grown under Sunlike and white LEDs showed higher photosynthetic capacity than those grown under RB *** lettuce,plants grown under Sunlike LEDs showed larger leaf area and higher dry weight than the other two ***,the leaf photosynthetic capacity of lettuce grown under Sunlike LEDs was the *** this context,the spectrum induced plant functions are ***,the three types of LEDs show distinct light spectra and they are different in many ***,it is difficult to attribute the different plant responses to certain specific light *** conclude that plants grown under Sunlike LEDs exhibit larger leaf area,which may be due to some specific spectrum distributions(such as more far-red radiation),and consequently are favorable for light interception and therefore result in greater production.

关键词： cucumber leaf photosynthesis lettuce plant morphology Sunlike LEDs

Optimization of processing parameters for preparation of Al-3Ti-1B grain refiner

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 387-391页

作者： LI Bao WANG Hong-wei ZHAO rui-feng WEI Zun-jie School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Beijng Xinghang Mechanical Electrical Equipment Factory Beijing 100074China

Al-3Ti-1B master alloys were prepared at different processing parameters by the reaction of halide salts,and the grain refining response of Al-7Si alloy was investigated with Al-3Ti-B master *** microstructure of master alloy and its grain refining effect on Al-7Si alloy were investigated by means of OM,XRD and *** results show that,the size of Al3Ti particles presented in Al-3Ti-1B master alloys increases with the increase of reaction temperature and decreases with the increase of cooling *** grain refining efficiency of Al-3Ti-1B master alloy on Al-7Si alloy is mainly attributed to heterogeneous nucleation of Al3Ti particles,and the morphology ofα(Al)changes from coarse dendritic to fine *** a result,Al-3Ti-1B master alloy is prepared by permanent mold,and holding at 800 ℃for 30min,which has better grain refining performance on Al-7Si alloy.

关键词： Al-3Ti-1B master alloy processing parameters grain refinement Al-7Si alloy

Selenium distribution and nitrate metabolism in hydroponic lettuce(Lactuca sativa L.): Effects of selenium forms and light spectra

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第1期19卷 133-144页

作者： BIAN Zhong-hua LEI Bo CHENG rui-feng WANG Yu LI Tao YANG Qi-chang Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081P.R.China School of Animal Rural and Environmental SciencesNottingham Trent UniversityBrackenhurst CampusNG250QFUK

A deficiency in selenium(Se) in the human diet is a worldwide problem. The intake of Se-rich vegetables can be a safe way to combat Se deficiency for humans. However, most leafy vegetables can accumulate a high content of nitrates, which poses a potential threat to human health. Light is an important environmental factor that regulates the uptake and distribution of mineral elements and nitrogen metabolism in plants. However, the effects of Se forms and light conditions, especially light spectra, on the uptake and translocation of Se and on nitrate reduction are poorly understood. In this study, lettuce(Lactuca sativa L.) was treated with exogenous Se applied as selenate(10 mmol L^-1) and selenite(0.5 mmol L^-1) and grown under five different light spectra: fluorescent light(FL), monochromatic red LED light(R), monochromatic blue LED light(B), and mixed red and blue LED light with a red to blue light ratio at 4(R/B=4), 8(R/B=8), and 12(R/B=12), respectively. The effects of light spectra and Se forms on plant growth, photosynthetic performance, Se accumulation and nitrate reduction were investigated. The results showed that the light spectra and Se forms had significant interactions for plant growth, foliar Se accumulation and nitrate reduction. The Se concentration and nitrate content in the leaves were negatively correlated with the percentage of red light from the light sources. Compared to Se applied as selenite, exogenous Se applied as selenate was more effective in reducing nitrate via promoting nitrate reductase and glutamate synthase activities. The lowest nitrate content and highest plant biomass were observed under R/B=8 for both the selenate and selenite treatments. The significant effect of the light spectra on the root concentration factor and translocation factor of Se resulted in marked variations in the Se concentrations in the roots and leaves. Compared with FL, red and blue LED light led to significant decreases in the foliar Se concentration. The r

关键词： selenium light spectra nitrates nitrogen metabolism enzymes LEDs Lactuca sativa L.

Sedimentary architecture of submarine channel-lobe systems under different seafloor topography:Insights from the Rovuma Basin offshore East Africa

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 125-142页

作者： Mei Chen Sheng-He Wu rui-feng Wang Jia-Jia Zhang Peng-Fei Xie Min Wang Xiao-feng Wang Ji-Tao Yu Qi-Cong Xiong State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Faculty of Geosciences University of BremenBremen28359Germany MARUM-Center for Marine and Environmental Sciences University of BremenBremen28359Germany Research institute of Petroleum Exploration and Development PetroChinaBeijing10083China School of Geosciences Yangtze UniversityWuhan 100083HubeiChina CNODC Mozambique Ltd. Beijing 100034China

Seafloor topography plays an important role in the evolution of submarine ***,it is still not so clear how the shape of slope affects the three-dimensional(3-D)architecture of submarine *** this study,we analyze the effect of topography factors on different hierarchical lobe architectures that formed during Pliocene to Quaternary in the Rovuma Basin offshore East *** characterize the shape,size and growth pattern of different hierarchical lobe architectures using 3-D seismic *** find that the relief of the topographic slope determines the location of preferential deposition of lobe complexes and single *** the topography is irregular and presents topographic lows,lobe complexes first infill these *** lobes are deposited preferentially at positions with higher longitudinal(***-slope)slope *** the longitudinal slope becomes higher,the aspect ratio of the single lobes ***(***-slope)topography does not seem to have a strong influence on the shape of single lobe,but it seems to affect the overlap of single *** the lateral slope gradient is relatively high,the single lobes tend to have a larger overlap ***,as the average of lateral slope and longitudinal slope gets greater,the width/thickness ratio of the single lobe is smaller,*** tend to accumulate *** results demonstrate that the shape of slopes more comprehensively influences the 3-D architecture of lobes in natural deep-sea systems than previously other lobe deposits and analogue experiments,which helps us better understand the development and evolution of the distal parts of turbidite systems.

关键词： Submarine fan Seafloor topography Sedimentary architecture Slope system SW Indian ocean

Effect of type 2 diabetes mellitus on flavonoid pharmacokinetics and tissue distribution after oral administration of Radix Scutellaria extract in rats

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2018年第6期16卷 418-427页

作者： ZHANG Xue-Ju LIU Shu XING Jun-Peng LIU Zhi-Qiang SONG feng-rui National Center of Mass Spectrometry in Changchun Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass SpectrometryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100039China

Radix Scutellaria is widely applied to the treatment of diabetes mellitus in China. Its main bioactive constituents contain baicalin, wogonoside, oroxyloside, and their aglycones. To investigate the effect of type 2 diabetes mellitus on both pharmacokinetics and tissue distribution of these flavonoid compounds, the six flavonoids in plasma and tissues from the normal and type 2 diabetic rats after oral administration of Radix Scutellaria extract were simultaneously measured by ultra-performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS) method. The results showed that baicalin, wogonoside, and oroxyloside had higher Cmax and AUC values(P < 0.05) in type 2 diabetic rats than that in normal rats and the tissue-distribution behaviors of the six flavonoid compounds in hearts, livers, spleens, lungs, kidneys, brains, pancreas, fat and muscle of the type 2 diabetic rats showed obviously differences from the normal rats(P < 0.05). In conclusion, the differences in the pharmacokinetics of oroxyloside and tissue distribution of the six flavanoids in Radix Scutellaria extract between diabetic and normal rats were found for the first time. The results from the present study provided a crucial basis for a better understanding of in vivo anti-diabetic mechanism of action of the six flavonoids from Radix Scutellaria.

关键词： Radix Scutellaria Diabetes mellitus Flavonoid Pharmacokinetics Tissue distribution

Inhibitory effect of eleven herbal extracts on advanced glycation end-products formation and aldose reductase activity

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第7期25卷 1039-1043页

作者： Guang-Yue Hou Lu Wang Shu Liu feng-rui Song Zhi-Qiang Liu Changchun Center of Mass Spectrometry & Chemical Biology Laboratory Changchun Institute of Applied ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

The formation of advanced glycation end-products （AGEs） and aldose reductase （AR） activity have been implicated in the development of diabetic complications. Our study sought to characterize the capacities of eleven herbal extracts against the formation of AGEs and the AR activity. An ultrahigh performance liquid chromatography and tandem mass spectrometry （UPLC-MS/MS） method was used for the detection of AR activity and the screening of AR inhibitors in this research. The amount of sorbitol from each analyte was directly detected using the multiple reaction monitoring mode and the sorbitol level could be reduced via the addition of an inhibitor. Moreover, the BSA/glucose （fructose） system was applied to investigate their inhibitory activities of AGEs formation in glycation model reactions. Compared with other screened herbs used in our study, Flos Sophorae lrnrnaturus and Radix Scutellariae seemed to be more effective on inhibiting the formation of AGEs and AR activity. The inhibiting capacities of herbal extracts against AR activity and AGEs formation may be correlated with the bioactive components of the herbal extracts. The differences were correlated with the amount of polyphenol and flavonoid components. In the study, we have investigated the potential anti-hyperglycemic bioactivity of eleven herbal extracts in vitro, which could provide a reference for further in vivo research in the prevention and treatment of diabetic complications.

关键词： Herbal extract Aldose reductase Advanced glycation end-products Ultrahigh performance liquidchromatography-tandem massspectrometry

Studies on Fragmentation of Peptide by Nano-electrospray Ionization Fourier Transform Ion Cyclotron Resonance Multi-stage Tandem Mass Spectrometry

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第5期27卷 773-776页

作者： SHI Ying LIU Ning SONG feng-rui LIU Zhi-qiang LIU Shu-ying Changchun Centre of Mass Spectrometry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China Central Laboratory the Second Hospital of Jilin University Changchun 130041 P. R. China Graduate School of the Chinese Academy of Sciences Beijing 100049 P. R. China

The sequence analysis of peptides was performed by nano-electrospray ionization Fourier transform ion cyclotron resonance tandem mass spectrometry（Nano-ESI-FT-ICR-MSn） and several peptides were chosen as examples. With the aid of the collision induced dissociation（CID）, FT-ICR provides not only precise mass/charge ratio, but also structure information of the selected peptides. The fragment ions were identified according to the observed molecular weights and peptide sequence was determined successfully. So Nano-ESI-FT-ICR-MSn is a useful tool for identification of the amino acid sequence of peptides with high confidence. Besides, a pathway for the dehydration of y ions without amino acids containing carboxylic acid under sustained off-resonance irradiation collision-induced dissociation（SORI-CID） condition was proposed.

关键词： Nano-electrospray ionization Fourier transform ion cyclotron resonance tandem mass spectrometry(Nano-ESI-FT-ICR-MS) Collision induced dissociation(CID) Peptide sequence

Application of sintilimab combined with anlotinib hydrochloride in the clinical treatment of microsatellite stable colorectal cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2023年第11期15卷 1925-1935页

作者： rui feng De-Xin Cheng Xiao-Chen Chen Liu Yang Hao Wu Department of Interventional Medicine Zhejiang Provincial People’s HospitalPeople’s Hospital of Hangzhou Medical CollegeHangzhou 310000Zhejiang ProvinceChina Cancer Center Department of Radiation OncologyZhejiang Provincial People’s HospitalPeople’s Hospital of Hangzhou Medical CollegeHangzhou 310000Zhejiang ProvinceChina Department of Vascular Surgery Zhejiang Provincial People’s HospitalPeople’s Hospital of Hangzhou Medical CollegeHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Microsatellite stable(MSS)colorectal cancer(CRC)is a common type of tumor with limited treatment *** and anlotinib hydrochloride are two extensively studied anticancer *** To probe the clinical value of combining sintilimab with anlotinib hydrochloride in MSS CRC *** During the period spanning from April 2019 to April 2022,Zhejiang Provincial People’s Hospital accommodated a cohort of 92 patients diagnosed with MSS CRC who were classified into two distinct groups in our study,the observation group and the control *** control group was administered anlotinib hy-drochloride as their designated therapy,whereas the observation group received the additional treatment of sintilimab in conjunction with the therapy assigned to the control *** administration of treatment occurred in cycles consisting of a duration of 3 wk,and the evaluation of effectiveness took place subsequent to the completion of two consecutive cycles of treatment within both groups.A comparative analysis between the two groups was conducted to assess the short-term efficacy and ascertain the incidence of adverse events transpiring throughout the duration of the treatment *** in the levels of carcinoembryonic Life Questionnaire-Core 30 were compared between the two groups prior to and subsequent to ***,a 1-year follow-up was conducted for both groups of patients,and the survival status was recorded and *** The short-term effectiveness displayed by the observation group surpassed that exhibited by the control group,with a statistically significant discrepancy(76.09%vs 50.00%),reaching a significance level denoted as P<*** the administration of treatment,the observation group manifested a considerable reduction in numerous serum indicators,which were found to be lower than the corresponding pretreatment levels within the same group as well as the post-treatment levels observed in the control group(P<0.0

关键词： Microsatellite stability Colorectal cancer Sintilimab Anlotinib hydrochloride Immunity prognosis