检索结果-南通市图书馆

International Journal of Digital Earth 2019年第10期12卷 1118-1132页

作者： Quang-Thanh Bui Manh Pham Van nguyen Thi thuy Hang Quoc-Huy nguyen nguyen Xuan Linh Pham Minh Hai Tran Anh Tuan Pham Van Cu Center for Applied Research in Remote sensing and GIS(CARGIS) VNU University of ScienceHa NoiViet Nam VNU University of Science Ha NoiViet Nam Vietnam Institute of Geodesy and Cartography Ha NoiViet Nam Ministry of Education and Training Ha NoiViet Nam

This study proposed a novel object-based hybrid classification model named GMNN that combines Grasshopper Optimization Algorithm(GOA)and the multiple-class Neural network(MNN)for urban pattern detection in Hanoi,*** bands of SPOT 7 image and derivable NDVI,NDWI were used to generate image segments with associated attributes by PCI Geomatics *** segments were classified into four urban surface types(namely water,impervious surface,vegetation and bare soil)by the proposed ***,three training and validation datasets of different sizes were used to verify the robustness of this *** all tests,the overall accuracies of the classification were approximately 87%,and the Area under Receiver Operating Characteristic curves for each land cover type was ***,the performance of this model was examined by comparing several statistical indicators with common benchmark *** results showed that GMNN out-performed established methods in all comparable *** results suggested that our hybrid model was successfully deployed in the study area and could be used as an alternative classification method for urban land cover *** a broader sense,classification methods will be enriched with the active and fast-growing contribution of metaheuristic algorithms.

关键词： Urban remote sensing object-based classification neural network grasshopper optimization algorithm

N4-methylcytidine ribosomal RNA methylation in chloroplasts is crucial for chloroplast function,development,and abscisic acid response in Arabidopsis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2021年第3期63卷 570-582页

作者： Le nguyen Tieu ngoc Su Jung Park Trinh Thi Huong Kwang Ho Lee Hunseung Kang Department of Applied Biology College of Agriculture and Life SciencesChonnam National UniversityGwangju 61186Republic of Korea Faculty of Forestry Agriculture Tay Nguyen UniversityBuonMaThuotDakLak63000Vietnam Center for Research Facilities Chonnam National UniversityGwangju 61186Republic of Korea

Although the essential role of messenger RNA methylation in the nucleus is increasingly understood,the nature of ribosomal RNA(rRNA)methyltransferases and the role of rRNA methylation in chloroplasts remain largely unknown.A recent study revealed that CMAL(for Chloroplast mraW-Like)is a chloroplast-localized rRNA methyltransferase that is responsible for N4-methylcytidine(m^(4)C)in 16S chloroplast rRNA in Arabidopsis *** this study,we further examined the role of CMAL in chloroplast biogenesis and function,development,and hormone *** cmal mutant showed reduced chlorophyll biosynthesis,photosynthetic activity,and growth-defect phenotypes,including severely stunted stems,fewer siliques,and lower seed *** cmal mutant was hypersensitive to chloroplast translation inhibitors,such as lincomycin and erythromycin,indicating that the m^(4)C methylation defect in the 16S rRNA leads to a reduced translational activity in ***,the stunted stem of the cmal mutant was partially rescued by exogenous gibberellic acid or *** cmal mutant grew poorer than wild type,whereas the CMAL-overexpressing transgenic Arabidopsis plants grew better than wild type in the presence of abscisic ***,these results indicate that CMAL is an indispensable rRNA methyltransferase in chloroplasts and is crucial for chloroplast biogenesis and function,photosynthesis,and hormone response during plant growth and development.

关键词： abiotic stress Arabidopsis chloroplast CMAL RNA methylation rRNA methylation

Morphology and kinematics of the gas envelope of the Mira binary W Aquilae

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第7期16卷 47-54页

作者： Do Thi Hoai Pham Tuyet Nhung Pham ngoc Diep nguyen Thi Phuong Pham Tuan-Anh nguyen Thi Thao Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

We analyse ALMA observations of the12CO（3-2） emission of the circumstellar envelope（CSE）of the Mira variable binary star W Aql. These provide, for the first time, spatially resolved Doppler velocity spectra of the CSE up to angular distances to the central star ofy nature of the observations（only five minutes in each of～5′′（meaning some 2000 AU）. The explorator two different configurations） does not allow for a detailed modelling of the properties of the CSE but provides important qualitative information on its morphology and kinematics. Emission is found to be enhanced along an axis moving from east/west to north-east/south-west when the angular distance from the central star projected on the plane of the sky increases from zero to four arcseconds. In parallel, the Doppler velocity distribution displays asymmetry along an axis moving from east/west to north-west/south-east. The results are discussed in the context of earlier observations, in particular of the dust morphology.

关键词： stars AGB and post-AGB (stars ) circumstellar matter stars individual(W Aql) stars mass-loss radio lines stars

Morphology and kinematics of the gas envelope of the variable AGB star π^1 Gruis

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第7期16卷 97-104页

作者： Pham Tuyet Nhung Do Thi Hoai Pham ngoc Diep nguyen Thi Phuong nguyen Thi Thao Pham Tuan Anh Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

Observations of the ^12CO（3–2） emission from the circumstellar envelope（CSE） of the variable star π1Gru using the compact array of the ALMA observatory have been recently made accessible to the public. An analysis of the morphology and kinematics of the CSE is presented with a result very similar to that obtained earlier for ^12CO（2–1） emission using the Submillimeter Array. A quantitative comparison is made using their flared disk model. A new model is presented that provides a significantly better description of the data, using radial winds and smooth evolutions of the radio emission and wind velocity from the stellar equator to the poles.

关键词： stars AGB and post-AGB circumstellar matter star individual(π1Gru) stars massloss radio lines stars

Influence of different land-use types on selected soil properties related to soil fertility in A Luoi District,Thua Thien Hue,Vietnam

在线全文

学校读者我要写书评

暂无评论

Soil Ecology Letters 2024年第1期6卷 131-140页

作者： Khoa Phuc nguyen Tan Trong Tran Huy Dinh Le Phuong thuy nguyen Hien Thao Thi Pham Dien Thanh nguyen Ngu Huu nguyen University of Agriculture and Forestry Hue UniversityHue CityThua Thien Hue 52000Vietnam School of Biotechnology Tan Tao UniversityTan Duc ECityDuc HoaLong An850000Vietnam

Land use type affects the physicochemical properties of *** value of OM and TN is high in acacia *** acidity of soil is considered a serious constraint for *** cash crops are acacia,cassava,banana,rice and *** fertility is affected by land-use types and land management,which exacerbates soil erosion and various other forms of soil degradation in the mountainous regions of *** study was conducted in A Luoi District,Thua Thien Hue,Vietnam to identify the effects of land-use types on specific soil physicochemical characteristics related to soil *** physicochemical properties,such as organic matter(OM),total nitrogen(TN),total phosphorous(TP),and K+were significantly affected by land-use *** results showed that the soils were sandy in rice but clay loam for acacia and *** mean bulk density value of acacia soil was significantly greater than that of other *** were higher in the acacia soils than those in the rice,maize,and banana *** OM content was significantly higher in the acacia,cassava,and banana soils than those in the rice and maize *** mean of exchangeable K+in the rice soil was higher compared to those in other soils and was affected by land-use *** high exchangeable acidity content in the soils was probably due to intensive ***,both land use type and management did not affect the CEC ***,the inappropriate land use caused the disturbance of soil physicochemical properties,indicating that the conditions of rice and maize soils are becoming worse than acacia ***,lowering the intensity of cultivation,adopting incorporated soil fertility management,and applying organic fertilizer should preserve the existing conditions and enhance soil properties.

关键词： Land-use types soil characteristics soil frility suitable crop Vietnam

Usefulness of Mac-2 binding protein glycosylation isomer in noninvasive probing liver disease in the Vietnamese population

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 Hepatology 2020年第5期12卷 220-229页

作者： thuy Thi Thu Pham Dat Tan Ho Toan nguyen MEDIC Medical Center Ho Chi Minh 72517Vietnam

BACKGROUND Early diagnosis is critical for successful intervention before liver disease progresses to cirrhosis and hepatocellular *** To examine a novel biomarker for probing early liver disease quickly using an automated immunology *** This was a cross-sectional study.140 patients at various stages of liver disease were randomly *** cohort consisted of patients who were treatment naïve and currently undergoing *** included patients with diverse liver disease ***-2 binding protein glycosylation isomer(M2BPGi)levels in addition to different clinical parameters,co-morbidities and transient elastography results were collected and *** M2BPGi levels were significantly correlated with transient elastography for liver fibrosis staging across all disease *** significant differences were observed in patients with F0-1;F2 and>F3 liver *** examination showed that M2BPGi levels were two-fold higher in F4 than F3 hepatitis C(HCV)patients.M2BPGi was observed to be etiology-specific and HCV patients had higher mean M2BPGi *** also observed significant correlations with aspartate aminotransferase to platelet ratio index and fibrosis-4 index as well as HBV DNA *** M2BPGi levels for HBV patients with a viral load lower than 2000 IU/mL was 1.75-fold lower than those with a viral load greater than 2000 IU/*** M2BPGi was observed to be a good indicator of early liver disease in patients with different *** results provide reference cut-offs for different causes of liver disease and demonstrated the utility of this marker for early disease *** is useful for remote regions in developing countries.

关键词： Hepatitis B Hepatitis C Noninvasive fibrosis markers Mac-2 binding protein glycosylation isomer Liver disease

^(12)CO emission from the Red Rectangle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第12期15卷 2213-2228页

作者： Pham Tuan Anh Pham ngoc Diep Do Thi Hoai Pham Tuyet Nhung nguyen Thi Phuong nguyen Thi Thao Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

Observations of an unprecedented quality made by ALMA on the Red Rectangle of CO（3-2） and CO（6-5） emissions are analysed jointly with the aim of obtaining as simple as possible a description of the gas morphology and kinematics. Evidence is found for polar conical outflows and for a broad equatorial torus in rotation and expansion. Simple models of both are proposed. Comparing CO（6-5） and CO（3-2） emissions provides evidence for a strong temperature enhancement over the polar outflows. Continuum emission （dust） is seen to be enhanced in the equatorial region. Observed asymmetries are briefly discussed.

关键词： stars: AGB and post-AGB -- circumstellar matter -- radio-lines: stars-- planetary nebulae: individual (Red Rectangle)

Preparation and Characterization of Silver Doped ZnO Nanostructures

在线全文

学校读者我要写书评

暂无评论

Open Journal of Synthesis Theory and Applications 2012年第2期1卷 18-22页

作者： nguyen Van Nghia Tran Nam Trung nguyen ngoc Khoa Truong Doan Minh thuy Department of Physics Quy Nhon University Quy Nhon Vietnam

ZnO was prepared by hydrothermal method. The result of scanning electron microscopy showed that the materials had nano rod structures. Ag-doped ZnO was prepared by UV-photoreduction. Crystalline phases and optical absorption of the prepared Ag-doped ZnO samples were determined by X-ray diffraction, Raman spectrum, UV-visible, and UV- photoreduction spectrophotometer. X-ray analyses revealed that Ag was doped ZnO crystallizes in hexagonal wurtzite structure. The incorporation of Ag+ in the site of Zn2+ provoked an increase in the size of nanocrystals as compared to pure ZnO. The photocatalytic and photoluminescence properties of materials were considered.

关键词： Nanostructures Photocatalysis Hydrothermal ZnO Silver Doping

An Optimized Algorithm for D2D-MIMO 5G Wireless Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第9期68卷 3029-3044页

作者： Shahid Bashir Imran Khan Fahd NAl-Wesabi Nadhem Nemri Ammar Zahary Quang ngoc nguyen 无 Department of Business Studies Namal UniversityPakistan Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan Department of Computer Science King Khalid UniversityMuhayel AseerKSA Faculty of Computer and IT Sana’a UniversitySana’aYemen Department of Communications and Computer Engineering Faculty of Science and Engineering Waseda University Shinjuku-kuTokyo169-0051Japan

The device-to-device(D2D)networking technology is extended to the conventional cellular network to boost the communication efficiency of the entire network,forming a heterogeneous 5G and beyond(B5G)communication network.D2D communication in a cellular cell will boost the efficiency of the spectrum,increase the ability of the device,and reduce the communication burden of base stations through the sharing of approved cell resources,causing serious interference as *** device-to-device(D2D)networking technology is extended to the conventional cellular network to boost the communication efficiency of the entire network,forming a heterogeneous 5G communication network.D2D communication in a cellular cell will boost the efficiency of the spectrum,increase the ability of the device,and reduce the communication burden of base stations through the sharing of approved cell resources,causing serious interference as *** paper proposes an efficient algorithm to minimize interference,based on the parity of the number of antennas,to resolve this *** primary concept is to generate the cellular connection precoding matrix by minimizing the power of interference from the base station to non-targeted *** through the criterion of maximum SINR,the interference suppression matrix of the cellular connection is ***,by removing intra-interference through linear interference alignment,the maximum degree of freedom is *** results of the simulation show that the proposed algorithm efficiently increases the performance of the spectrum,decreases interference,improves the degrees of freedom and energy efficiency compared to current algorithms.

关键词： 5G and beyond(B5G)networks device-to-device heterogeneous interference multiple-input and multiple-output

Does green growth in E-7 countries depend on economic policy uncertainty,institutional quality,and renewable energy?Evidence from quantile-based regression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第6期14卷 224-233页

作者： Yongzhong Jiang Arshian Sharif Ahsan Anwar Phan The Cong Bawani Lelchumanan Vu Thi Yen nguyen Thi thuy Vinh College of Management Science Chengdu University of TechnologyChengdu 610059China Department of Economics and Finance Sunway Business SchoolSunway UniversitySubang JayaMalaysia University of Economics and Human Sciences in Warsaw WarsawPoland Faculty of Management Sciences Department of Business AdministrationILMA UniversityKarachiPakistan Faculty of Economics Thuongmai UniversityHanoiViet Nam Foreign Trade University HanoiViet Nam

Environmental degradation is one of the most debatable topics at international forums and it is considered a prime concern for the entire ***,researchers and policymakers have turned their attention from conventional economic growth to green *** the existing literature has discussed several determinants of green growth,the impact of economic policy uncertainty(EPU),renewable energy consumption(RENE),and institutional quality(IQ)on green growth(GGDP)is relatively ***,this study is the earliest attempt to investigate the impact of EPU,IQ,and RENE on GGDP for emerging seven(E-7)countries from 1996 to *** doing so,we apply panel quantile regression(PQR).The empirical findings delineate that EPU has a negative impact on GGDP,whereas IQ and RENE enhance the GGDP in E-7 *** on the outcomes,this study suggests policy implications for achieving targets of the SDG 07,SDG 08,SDG 13,and SDG *** governments of these countries can achieve higher GGDP by ensuring political stability and reliable macroeconomic policies and through making such flexible policies that can easily control or address unpredictable future economic issues.

关键词： Green growth Economic policy uncertainty Institutional quality Renewable energy Sustainable development goals