检索结果-南通市图书馆

A Unified Model Fusing Region of Interest Detection and Super Resolution for Video Compression

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 2024年第6期79卷 3955-3975页

作者： Xinkun Tang Feng Ouyang Ying Xu Ligu Zhu Bo Peng School of Computer and Cyber Sciences Communication University of ChinaBeijing100024China Cable television Technology Research Institute Academy of Broadcasting ScienceBeijing100866China

High-resolution video transmission requires a substantial amount of *** this paper,we present a novel video processing methodology that innovatively integrates region of interest(ROI)identification and super-resolution *** method commences with the accurate detection of ROIs within video sequences,followed by the application of advanced super-resolution techniques to these areas,thereby preserving visual quality while economizing on data *** validate and benchmark our approach,we have curated a new gaming dataset tailored to evaluate the effectiveness of ROI-based super-resolution in practical *** proposed model architecture leverages the transformer network framework,guided by a carefully designed multi-task loss function,which facilitates concurrent learning and execution of both ROI identification and resolution enhancement *** unified deep learning model exhibits remarkable performance in achieving super-resolution on our custom *** implications of this research extend to optimizing low-bitrate video streaming *** selectively enhancing the resolution of critical regions in videos,our solution enables high-quality video delivery under constrained bandwidth *** results demonstrate a 15%reduction in transmission bandwidth compared to traditional super-resolution based compression methods,without any perceivable decline in visual *** work thus contributes to the advancement of video compression and enhancement technologies,offering an effective strategy for improving digital media delivery efficiency and user experience,especially in bandwidth-limited *** innovative integration of ROI identification and super-resolution presents promising avenues for future research and development in adaptive and intelligent video communication systems.

关键词： Super resolution region of interest detection video compression

Summer Warming Limited Bud Output Drives a Decline in Daughter Shoot Biomass through Reduced Photosynthetis of Parent Shoots in Leymus chinensis Seedlings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第7期93卷 1667-1675页

作者： Song Gao Ruocheng Xu Lin Li Jiao Wang Nian Liu Johannes M.H.Knops Junfeng Wang Graduate School Changchun UniversityChangchun130022China Key Laboratory of Vegetation Ecology Ministry of EducationInstitute of Grassland ScienceSchool of Life SciencesJilin Songnen Grassland Ecosystem National Observation and Research StationNortheast Normal UniversityChangchun130024China Jilin Agricultural radio and television School Changchun130599China Department of Health and Environmental Sciences Xi’an Jiaotong Liverpool UniversitySuzhou215000China

Understanding how summer warming inﬂuences the parent and daughter shoot production in a perennial clonal grass is vital for comprehending the response of grassland productivity to global ***,we conducted a simulated experiment using potted Leymus chinensis,to study the relationship between the photosynthetic activ-ity of parent shoots and the production of daughter shoots under a whole(90 days)summer warming scenario(+3°C).The results showed that the biomass of parents and buds decreased by 25.52%and 33.45%,respectively,under warming *** reduction in parent shoot biomass due to warming directly resulted from decreased leaf area(18.03%),chlorophyll a(18.27%),chlorophyll b(29.21%)content,as well as a reduction in net photosynthetic rate(7.32%)and the maximum quantum efﬁciency of photosystem II(PSII)photochemistry(4.29%).The decline in daughter shoot biomass was linked to a decrease in daughter shoot number(33.33%)by ***,the number of belowground buds increased by 46.43%.The results indicated that long-term summer warming reduces biomass accumulation in parent shoot by increasing both limitation of stoma and ***,the parent shoot allocates relatively more biomass to the belowground organs to maintain the survival and growth of ***,buds,as a potential aboveground population,could remedy for the cur-rent loss of parent shoot density by increasing the number of future daughter shoots if summer warming subsides.

关键词： Warming parent shoot bud bank photosynthesis chlorophyllﬂuorescence Leymus chinensis

Indirect determination of cefradine with n-propyl alcohol-ammonium sulfate-water system by extraction-flotation of cuprous thiocyanate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第5期19卷 565-568页

作者： Ling Li Wu Wei Zhao Quan Min Li College of Chemistry and Environmental Science Henan Normal UniversityThe Key Laboratory of Environmental Pollution Control Technology of Henan province Xinxiang 453007 China henan radio and television university Zhengzhou 450008 China

A new method was developed for the determination of cefradine by extraction-flotation of CuSCN. The experiment indicated that in the presence of 0.20 mol/L NaOH the degradation of cefradine took place in water bath at 100 ℃. The thiol group （-SH） of the degradation product could reduce Cu（Ⅱ） to Cu（Ⅰ） for the formation of the emulsion CuSCN in the presence of NH4SCN at pH 4.0. By determining the residual amount of Cu（Ⅱ） in the solution and calculating the flotation yield of Cu（Ⅱ）, the indirect determination of cefradine can be obtained. This method has been applied to determine cefradine in capsules, human serum and urine samples, respectively.

关键词： Cefradine Copper(Ⅱ) n-Propyl alcohol Extraction-flotation

The relativistic bound states for a new ring-shaped harmonic oscillator

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2008年第2期17卷 380-384页

作者：周燕郭建友 Department of Physics Anhui Radio and Television University School of Physics and Material Science Anhui University

In this paper a new ring-shaped harmonic oscillator for spin 1/2 particles is studied, and the corresponding eigenfunctions and eigenenergies are obtained by solving the Dirac equation with equal mixture of vector and scalar potentials. Several particular cases such as the ring-shaped non-spherical harmonic oscillator, the ring-shaped harmonic oscillator, non-spherical harmonic oscillator, and spherical harmonic oscillator are also discussed.

关键词： new ring-shaped harmonic oscillator bound state Dirac equation

A novel method for the spectrophotometric determination of cefradine by using sodium nitroprusside as chromogenic reagent

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第12期19卷 1470-1474页

作者： Hua Zhang Ling Li Wu Quan Min Li Xin Zhen Du College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 China College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 China henan radio and television university Zhengzhou 453008 China

A novel method is developed for the determination of cefradine by using sodium nitroprusside as chromogenic reagent. The experiment indicates that a russety product is formed by the reaction of cefradine with sodium nitroprusside in basic solution, and the maximum absorption wavelength （λmax） of russety product is 505 rim. And the sensitization of tetradecyl benzyl dimethyl ammonium chloride for the reaction of cefradine with sodium nitroprusside is remarkable, The apparent molar absorption coefficient （5505） is 2.81 × 103 L/mol cm. The linear equation isA = 0.0657 ＋ 0.00804C （μg/mL） in the range of 1.50-55.0μg/mL of cefradine with a correlation coefficient r = 0.9992, and the detection limit is 1.38 p,g/mL. This method has been applied to determine cefradine in capsule and tablet samples.

关键词： Cefradine Sodium nitroprusside Chromogenic reagent Spectrophotometry

Extended Fan's Algebraic Method and Its Application to KdV and Variant Boussinesq Equations

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第7期48卷 1-6页

作者： YANG Xian-Lin TANG Jia-Shi College of Mechanics and Aerospace,Hunan university,Changsha 410082,China2 Department of Computer Science,Hunan radio and television university,Changsha 410004,China College of Mechanics and Aerospace Hunan University Department of Computer Science Hunan Radio and Television University

An extended Fan's algebraic method is used for constructing exact traveling wave solution of nonlinearpartial differential *** key idea of this method is to introduce an auxiliary ordinary differential equationwhich is regarded as an extended elliptic equation and whose degree Υ is expanded to the case of r>*** efficiency ofthe method is demonstrated by the KdV equation and the variant Boussinesq *** results indicate that themethod not only offers all solutions obtained by using Fu's and Fan's methods,but also some new solutions.

关键词： algebraic method KdV equation variant boussinesq equations polynomial complete discrimination system

Feasibility analysis for monitoring fatigue crack in hydraulic turbine blades using acoustic emission technique

在线全文

学校读者我要写书评

暂无评论

Journal of Central South university 2009年第3期16卷 444-450页

作者：王向红朱昌明毛汉领黄振峰 School of Mechanical Engineering Shanghai Jiaotong University Guangxi radio and television university School of Mechanical Engineering Guangxi University

In order to investigate the feasibility of monitoring the fatigue cracks in turbine blades using acoustic emission (AE) technique, the AE characteristics of fatigue crack growth were studied in the laboratory. And the characteristics were compared with those of background noise received from a real hydraulic turbine unit. It is found that the AE parameters such as the energy and duration can qualitatively describe the fatigue state of the blades. The correlations of crack propagation rates and acoustic emission count rates vs stress intensity factor (SIF) range are also obtained. At the same time, for the specimens of 20SiMn under the given testing conditions, it is noted that the rise time and duration of events emitted from the fatigue process are lower than those from the background noise; amplitude range is 49-74 dB, which is lower than that of the noise (90-99 dB); frequency range of main energy of crack signals is higher than 60 kHz while that in the noise is lower than 55 kHz. Thus, it is possible to extract the useful crack signals from the noise through appropriate signal processing methods and to represent the crack status of blade materials by AE parameters. As a result, it is feasible to monitor the safety of runners using AE technique.

关键词： fatigue crack acoustic emission hydraulic turbine blade

Synthesis, Crystal Structure, Luminescent Property and DNA-Binding of a Cadmium Complex with 2,4-Bis-oxyacetate-benzoic Acid

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2015年第7期34卷 1080-1086页

作者：郭航鸣沈伟陈小菊赵国良 Jinhua radio and television university College of Chemistry and Life Science Zhejiang Normal University Xingzhi College Zhejiang Normal University

A complex [Cd2Na2（BOABA）2（H2O）8]·H2O（1） was synthesized by using 2,4-bisoxyacetate-benzoic acid（H3BOABA） and Cd（OH）2. It was characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. Complex 1 shows a two-dimensional 3-connected rigid plane. The interactions between the ligand and its complex with DNA were studied by Et Br fluorescence probe. Photoluminescent studies indicate that the complex may be excellent candidates for potential photoactive materials.

关键词： Cd complex 2 4-bis-oxyacetate-benzoic acid crystal structure DNA-binding photoluminescence

Dynamic Trust Model Based on Service Recommendation in Big Data

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2019年第3期58卷 845-857页

作者： Gang Wang Mengjuan Liu Xi’an university of Finance and Economics Xi’an710100China Shaanxi radio and television university Xi’an710068China.

In big data of business service or transaction,it is impossible to provide entire information to both of services from cyber system,so some service providers made use of maliciously services to get more *** management is an effective solution to deal with these malicious *** paper gave a trust computing model based on service-recommendation in big *** model takes into account difference of recommendation trust between familiar node and stranger ***,to ensure accuracy of recommending trust computing,paper proposed a fine-granularity similarity computing method based on the similarity of service concept domain *** model is more accurate in computing trust value of cyber service nodes and prevents better cheating and attacking of malicious service *** results illustrated our model is effective.

关键词： Trust model recommendation trust content similarity ontology big data.