In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium(Ⅲ) with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoric syste...In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium(Ⅲ) with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoric system tolerates the existence of a considerable amount of masking agents,so that many interfering ions can be masked and its selectivity would be further improved.After studying the optimum conditions and main charac- ters of some similar systems,the system of Sc(Ⅲ)—Orthonitrophenyuorone—Cetyltrimethylammonium Bromide(CTMAB)—Triton X-200 is chosen for the spectrophotometric determination of microamount of scandium.The proposed method shows not only high sensitivity(with a molar absorptivity of 2.12×1~sL mol^(-1)·cm^(-1))and selectivity,but also high tolerance of chromophoric conditions.Beer's law is obeyed over a range of 0～6.0 μg Sc/25ml.If the dual-wavelength method is applied,a much higher molar absorptivity o|' 3.04×10~5L·mol^(-1)·cm^(-1)than those of other systems ever reported in the literatures can be attained:more- over.its linear range is extended to 0～8.0 μg Sc/25ml and its reproducibility is also improved.展开更多
Runge-Kutta scheme is one of the versatile numerical tools for the simulation of engineering systems. Despite its wide and acceptable engineering use, there is dearth of relevant literature bordering on visual impress...Runge-Kutta scheme is one of the versatile numerical tools for the simulation of engineering systems. Despite its wide and acceptable engineering use, there is dearth of relevant literature bordering on visual impression possibility among different schemes coefficients which is the strong motivation for the present investigation of the third and fourth order schemes. The present study capitalise on results of tedious computation involving Taylor series expansion equivalent supplemented with Butcher assumptions and constraint equations of well-known works which captures the essential relationship between the coefficients. The simulation proceeds from random but valid specification of two out of the total coefficients possible per scheme. However the remaining coefficients are evaluated with application of appropriate function relationship. Eight and thirteen unknown coefficients were simulated respectively for third and fourth schemes over a total of five thousand cases each for relevant distribution statistics and scatter plots analysis for the purpose of scheme comparison and visual import. The respective three and four coefficients of the slope estimate for the third and fourth schemes have mix sign for large number of simulated cases. However, none of the two schemes have above three of these coefficients lesser than zero. The percentages of simulation results with two coefficients lesser than zero dominate and are respectively 56.88 and 77.10 for third and fourth schemes. It was observed that both popular third and fourth schemes belong to none of the coefficients being zero classification with respective percentage of 0.72 and 3.28 intotal simulated cases. The comparisons of corresponding scatter plots are visually exciting. The overall difference between corresponding scatter plots and distribution results can be used to justify the accuracy of fourth scheme over its counterpart third scheme.展开更多
Rewardless orchids attract pollinators by food, sexual, and brood-site mimicry, but other forms of sensory deception may also operate. Helmet orchids （Corybas, Nematoceras and related genera） are often assumed to be...Rewardless orchids attract pollinators by food, sexual, and brood-site mimicry, but other forms of sensory deception may also operate. Helmet orchids （Corybas, Nematoceras and related genera） are often assumed to be brood-site deceivers that mimic the colours and scents of mushrooms to fool female fungus gnats （Mycetophilidae） into attempting oviposition and polli- nating flowers. We sampled spectral reflectances and volatile odours of an endemic terrestrial New Zealand orchid Corybas cheesemanii, and co-occurring wild mushrooms. The orchid is scentless to humans and SPME GC-MS analyses did not detect any odours, but more sensitive methods may be required. The orchids reflected strongly across all visible wavelengths （300-700nm） with peaks in the UV （-320nm）, yellow-green （500-600 nm） and red regions （650-700 nm）, whereas mushrooms and surrounding leaf litter reflected predominantly red and no UV. Rather than mimicking mushrooms, these orchids may attract pollinators by exploiting insects＇ strong sensory bias for UV. Modelling spectral reflectances into a categorical fly vision model and a generic tetrachromat vision model provided very different results, but neither suggest any mimicry of mushrooms. However, these models require further assessment and data on fly spectral sensitivity to red wavelengths is lacking - a problem given the predominance of red, fly-pollinated flowers worldwide展开更多
The magnitude of river morphological changes are better analyzed through the use of quantitative approaches, wherein resolution accuracy and uncertainty assessment are treated as crucial key-factors. In this sense, th...The magnitude of river morphological changes are better analyzed through the use of quantitative approaches, wherein resolution accuracy and uncertainty assessment are treated as crucial key-factors. In this sense, the creation of precise DEMs （Digital Elevation Models） of rivers represents an affordable tool to analyze geomorphic variations and budgets, except for wetted areas, where reliable channel digitalization can normally be obtained only using expensive bathymetric surveys. The proposed work aims at improving channel surface models without having available bathymetric sensors, by deriving dry areas elevations from LiDAR data and water depth of wetted areas from aerial photos through a predictive depth-colour relationship. The methodology was applied to two different sub-reaches of the Piave River, a gravel-bed river which suffered severe flood events in 2010. Erosion and deposition patterns were identified through DEM differencing, showing a predominance of scour processes which can lead to channel instability situations. The bathymetric output was compared to other previously-derived models confirming the accuracy of the in-channel elevation estimates. Finally, a discussion on the role played by longitudinal protections during the studied flood events is proposed, focusing the attention on the incidence of two major bank erosions that removed significant volumes of stable areas.展开更多
Music and colour,as human hearing and visual art,are closely related to human psychological feelings and symbolic associations.There is an isomorphic relationship between music and colour.The article uses the concept...Music and colour,as human hearing and visual art,are closely related to human psychological feelings and symbolic associations.There is an isomorphic relationship between music and colour.The article uses the concept of“synesthesia”in psychology and the“co-construction”relationship in mathematics as a bridge,based on Kandinsky’s“inner sound”theory and Mallion’s“tone-colour system”,an interdisciplinary theoretical model of“timbre isomorphism synesthesia”(ISCM)is constructed.At the practical level,based on the ISCM theory,a set of timbre synesthesia visualization tools ASAH and visualization processes are designed,through music data input,graphics mapping visualization,colour mapping visualization,real-time interactive visualization,and finally output timbre synesthesia visualization works.In order to avoid the visual homogenization caused by algorithm design,ASHA has set up a custom editor,which emphasizes the individual differences and multi-sensory experience of tonal synesthesia visualization.展开更多
Previous studies have shown that visual cortical neurons in old mammals exhibit higher spontaneous activity,higher responsiveness to visual stimuli,and lower selectivity for stimulus orientations and motion directions...Previous studies have shown that visual cortical neurons in old mammals exhibit higher spontaneous activity,higher responsiveness to visual stimuli,and lower selectivity for stimulus orientations and motion directions than did neurons in young adult counterparts.However,whether the responsive difference in cortical neurons between young and old animals resulted from different effects induced by anesthetics has remained unclear.To clarify this issue,we recorded the response properties of individual neurons in the primary visual cortex of old and young adult cats while systematically varying the anesthesia level of urethane,a widely used anesthetic in physiology experiments.Our results showed that cumulatively administrating 50 mg and 100 mg of urethane upon the minimal level of urethane required to anesthetize an old or young adult cat did not significantly alter the degree of neuronal response selectivity for stimulus orientations and motion directions nor significantly change the visually-driven response and spontaneous activity of neurons in old and young adult cats.Cumulatively administrating 150 mg of urethane decreased neuronal responsiveness similarly in both age groups.Therefore,urethane appears to exert similar effects on neuronal response properties of old and young adult animals.展开更多
Objective: to study the clinical application effect of visual painless artificial abortion and conventional artificial abortion in artificial abortion. Methods: during the period from January 2018 to January 2020, 100...Objective: to study the clinical application effect of visual painless artificial abortion and conventional artificial abortion in artificial abortion. Methods: during the period from January 2018 to January 2020, 100 pregnant women who underwent artificial abortion in our hospital were selected as the research objects and randomly divided into the observation group and the control group with 50 in each group. The pregnant women in the observation group underwent visual painless artificial abortion, while those in the control group underwent conventional painless artificial abortion. The postoperative recovery, abortion and the probability of complications of the two groups were observed, and the advantages and disadvantages of the two surgical methods were analyzed. Results: comparing the data of the two groups, it can be seen that the operation time of abortion in the observation group is less than that in the control group, and the amount of hemorrhage in the operation is also less than that in the control group. The incidence of complications in the observation group is lower than that in the control group, and the satisfaction degree of pregnant women and their families to the operation is higher than that in the control group, P < 0.05. Conclusion: visual painless artificial abortion surgery can effectively increase the therapeutic effect compared with conventional abortion surgery, with shorter operation time, less bleeding during the operation and higher safety. It can also reduce complications and alleviate the pain of pregnant women, and is very worthy of promotion and use.展开更多
Objective:To assess the effectiveness of a visual double-lumen bronchial catheter in teaching lung isolation skills to anesthesia resident trainees.Methods:Between September 2023 and September 2024,20 anesthesiology r...Objective:To assess the effectiveness of a visual double-lumen bronchial catheter in teaching lung isolation skills to anesthesia resident trainees.Methods:Between September 2023 and September 2024,20 anesthesiology residents from Jiangsu Cancer Hospital were randomly divided into two groups:the visual double-lumen group(n=10)and the conventional double-lumen group(n=10).Randomization was achieved using a random number table.The study assessed several outcomes,including total intubation time,positioning time,one-time intubation success rate,intraoperative catheter displacement rate,surgeon satisfaction scores,and the incidence of postoperative complications(pharyngeal pain,hoarseness,and dry cough)within 24 hours.Results:The visual double-lumen group demonstrated superior results compared to the conventional double-lumen group in the following measures:total intubation time(70.2±11.8 s vs 224.9±35.6 s),positioning time(30.1±5.7s vs 176.6±26.4 s),one-time intubation success rate(85%vs 45%),intraoperative catheter displacement rate(10%vs 40%),surgeon’s intubation satisfaction score(8.10±1.07 vs 6.90±1.41),satisfaction score for pulmonary isolation(8.35±1.04 vs 6.55±1.36),and airway management satisfaction score(8.40±1.3 vs 6.70±1.34).Additionally,the incidence of postoperative pharyngeal pain(15%vs 45%),hoarseness(10%vs 40%),and dry cough(5%vs 35%)was significantly lower in the visual double-lumen group(all P<0.05).Conclusion:The visual double-lumen bronchial catheter significantly enhances the training of anesthesia residents in lung isolation by reducing intubation and positioning times,improving intubation success rate,increasing surgeon satisfaction,and reducing intubation-related complications.This method offers a more effective teaching approach compared to conventional techniques.展开更多
Sensory drive predicts coevolution of mate choice signals with the sensory systems detecting those sig nals. Guppies are a classic model for sensory drive as mate preferences based on coloration differ across individu...Sensory drive predicts coevolution of mate choice signals with the sensory systems detecting those sig nals. Guppies are a classic model for sensory drive as mate preferences based on coloration differ across individuals and populations. A large body of work has identified variation in color vision, yet we lack a dir ect tie between how such variation in color vision influences variation in color preference. Here we bring together studies that have investigated guppy vision over the past 40years to： （1） highlight our current understanding of where variation occurs in the guppy color vision pathway and （2） suggest future ave nues of research into sources of visual system variation that could influence guppy color preference. This will allow researchers to design careful studies that couple measures of color preference with measures of visual system variation from the same individual or population. Such studies will finally provide im portant answers as to what sets the direction and speed of mate preference evolution via sensory drive.展开更多
The colour feature is often used in the object tracking.The tracking methods extract the colour features of the object and the background,and distinguish them by a classifier.However,these existing methods simply use ...The colour feature is often used in the object tracking.The tracking methods extract the colour features of the object and the background,and distinguish them by a classifier.However,these existing methods simply use the colour information of the target pixels and do not consider the shape feature of the target,so that the description capability of the feature is weak.Moreover,incorporating shape information often leads to large feature dimension,which is not conducive to real-time object tracking.Recently,the emergence of visual tracking methods based on deep learning has also greatly increased the demand for computing resources of the algorithm.In this paper,we propose a real-time visual tracking method with compact shape and colour feature,which forms low dimensional compact shape and colour feature by fusing the shape and colour characteristics of the candidate object region,and reduces the dimensionality of the combined feature through the Hash function.The structural classification function is trained and updated online with dynamic data flow for adapting to the new frames.Further,the classification and prediction of the object are carried out with structured classification function.The experimental results demonstrate that the proposed tracker performs superiorly against several state-of-the-art algorithms on the challenging benchmark dataset OTB-100 and OTB-13.展开更多
An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, clo...An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.展开更多
Neurons in the nervous system make connections with ascending feedforward projections and descending feedback projections,as well as projections from neural structures at the identical hierarchical level.These neurons...Neurons in the nervous system make connections with ascending feedforward projections and descending feedback projections,as well as projections from neural structures at the identical hierarchical level.These neurons form extremely complicated neural networks and pathways.Compared with the role of the feedforward projection,much less is known concerning the functional roles of the feedback projection.Visual cortex is a good model for studying functional roles of cortical feedback projections which involve many high functions,such as attention,searching and cognition.The present review mainly focused on the functional roles of feedback projections in the visual system.展开更多
目的:基于文献计量学分析榄香烯相关研究领域的发展现状和发展态势。方法:从中国知网(CNKI)和Web of Science核心合集中检索2004—2024年榄香烯研究领域的相关文献,运用CiteSpace和VOSviewer进行文献计量学与可视化分析。结果:共纳入文...目的:基于文献计量学分析榄香烯相关研究领域的发展现状和发展态势。方法:从中国知网(CNKI)和Web of Science核心合集中检索2004—2024年榄香烯研究领域的相关文献,运用CiteSpace和VOSviewer进行文献计量学与可视化分析。结果:共纳入文献1 821篇,其中中文文献462篇,英文文献1 359篇。相比之下,英文文献发文量较大且总体呈逐年上升趋势。中英文发文量均为第一的作者为杭州师范大学的谢恬,其所在单位杭州师范大学也是英文文献发文量第一的科研机构。中英文关键词显示,榄香烯的研究热点主要集中于活性成分分析、榄香烯衍生产品和抗肿瘤作用。主要成分“β-榄香烯”为中英文文献中出现频数最高的关键词。结论:榄香烯相关研究领域目前仍处于上升阶段,发展前景良好,因此应深度剖析榄香烯的可能作用机制和临床应用,充分发挥其疗效优势和临床价值以推动中医药的传承创新发展。展开更多
文摘In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium(Ⅲ) with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoric system tolerates the existence of a considerable amount of masking agents,so that many interfering ions can be masked and its selectivity would be further improved.After studying the optimum conditions and main charac- ters of some similar systems,the system of Sc(Ⅲ)—Orthonitrophenyuorone—Cetyltrimethylammonium Bromide(CTMAB)—Triton X-200 is chosen for the spectrophotometric determination of microamount of scandium.The proposed method shows not only high sensitivity(with a molar absorptivity of 2.12×1~sL mol^(-1)·cm^(-1))and selectivity,but also high tolerance of chromophoric conditions.Beer's law is obeyed over a range of 0～6.0 μg Sc/25ml.If the dual-wavelength method is applied,a much higher molar absorptivity o|' 3.04×10~5L·mol^(-1)·cm^(-1)than those of other systems ever reported in the literatures can be attained:more- over.its linear range is extended to 0～8.0 μg Sc/25ml and its reproducibility is also improved.
文摘Runge-Kutta scheme is one of the versatile numerical tools for the simulation of engineering systems. Despite its wide and acceptable engineering use, there is dearth of relevant literature bordering on visual impression possibility among different schemes coefficients which is the strong motivation for the present investigation of the third and fourth order schemes. The present study capitalise on results of tedious computation involving Taylor series expansion equivalent supplemented with Butcher assumptions and constraint equations of well-known works which captures the essential relationship between the coefficients. The simulation proceeds from random but valid specification of two out of the total coefficients possible per scheme. However the remaining coefficients are evaluated with application of appropriate function relationship. Eight and thirteen unknown coefficients were simulated respectively for third and fourth schemes over a total of five thousand cases each for relevant distribution statistics and scatter plots analysis for the purpose of scheme comparison and visual import. The respective three and four coefficients of the slope estimate for the third and fourth schemes have mix sign for large number of simulated cases. However, none of the two schemes have above three of these coefficients lesser than zero. The percentages of simulation results with two coefficients lesser than zero dominate and are respectively 56.88 and 77.10 for third and fourth schemes. It was observed that both popular third and fourth schemes belong to none of the coefficients being zero classification with respective percentage of 0.72 and 3.28 intotal simulated cases. The comparisons of corresponding scatter plots are visually exciting. The overall difference between corresponding scatter plots and distribution results can be used to justify the accuracy of fourth scheme over its counterpart third scheme.
文摘Rewardless orchids attract pollinators by food, sexual, and brood-site mimicry, but other forms of sensory deception may also operate. Helmet orchids （Corybas, Nematoceras and related genera） are often assumed to be brood-site deceivers that mimic the colours and scents of mushrooms to fool female fungus gnats （Mycetophilidae） into attempting oviposition and polli- nating flowers. We sampled spectral reflectances and volatile odours of an endemic terrestrial New Zealand orchid Corybas cheesemanii, and co-occurring wild mushrooms. The orchid is scentless to humans and SPME GC-MS analyses did not detect any odours, but more sensitive methods may be required. The orchids reflected strongly across all visible wavelengths （300-700nm） with peaks in the UV （-320nm）, yellow-green （500-600 nm） and red regions （650-700 nm）, whereas mushrooms and surrounding leaf litter reflected predominantly red and no UV. Rather than mimicking mushrooms, these orchids may attract pollinators by exploiting insects＇ strong sensory bias for UV. Modelling spectral reflectances into a categorical fly vision model and a generic tetrachromat vision model provided very different results, but neither suggest any mimicry of mushrooms. However, these models require further assessment and data on fly spectral sensitivity to red wavelengths is lacking - a problem given the predominance of red, fly-pollinated flowers worldwide
文摘The magnitude of river morphological changes are better analyzed through the use of quantitative approaches, wherein resolution accuracy and uncertainty assessment are treated as crucial key-factors. In this sense, the creation of precise DEMs （Digital Elevation Models） of rivers represents an affordable tool to analyze geomorphic variations and budgets, except for wetted areas, where reliable channel digitalization can normally be obtained only using expensive bathymetric surveys. The proposed work aims at improving channel surface models without having available bathymetric sensors, by deriving dry areas elevations from LiDAR data and water depth of wetted areas from aerial photos through a predictive depth-colour relationship. The methodology was applied to two different sub-reaches of the Piave River, a gravel-bed river which suffered severe flood events in 2010. Erosion and deposition patterns were identified through DEM differencing, showing a predominance of scour processes which can lead to channel instability situations. The bathymetric output was compared to other previously-derived models confirming the accuracy of the in-channel elevation estimates. Finally, a discussion on the role played by longitudinal protections during the studied flood events is proposed, focusing the attention on the incidence of two major bank erosions that removed significant volumes of stable areas.
文摘Music and colour,as human hearing and visual art,are closely related to human psychological feelings and symbolic associations.There is an isomorphic relationship between music and colour.The article uses the concept of“synesthesia”in psychology and the“co-construction”relationship in mathematics as a bridge,based on Kandinsky’s“inner sound”theory and Mallion’s“tone-colour system”,an interdisciplinary theoretical model of“timbre isomorphism synesthesia”(ISCM)is constructed.At the practical level,based on the ISCM theory,a set of timbre synesthesia visualization tools ASAH and visualization processes are designed,through music data input,graphics mapping visualization,colour mapping visualization,real-time interactive visualization,and finally output timbre synesthesia visualization works.In order to avoid the visual homogenization caused by algorithm design,ASHA has set up a custom editor,which emphasizes the individual differences and multi-sensory experience of tonal synesthesia visualization.
基金Supported by Natural Science Foundation of Anhui Province (070413138)the Key Research Foundation of Anhui Province Education Department (KJ2009A167)
文摘Previous studies have shown that visual cortical neurons in old mammals exhibit higher spontaneous activity,higher responsiveness to visual stimuli,and lower selectivity for stimulus orientations and motion directions than did neurons in young adult counterparts.However,whether the responsive difference in cortical neurons between young and old animals resulted from different effects induced by anesthetics has remained unclear.To clarify this issue,we recorded the response properties of individual neurons in the primary visual cortex of old and young adult cats while systematically varying the anesthesia level of urethane,a widely used anesthetic in physiology experiments.Our results showed that cumulatively administrating 50 mg and 100 mg of urethane upon the minimal level of urethane required to anesthetize an old or young adult cat did not significantly alter the degree of neuronal response selectivity for stimulus orientations and motion directions nor significantly change the visually-driven response and spontaneous activity of neurons in old and young adult cats.Cumulatively administrating 150 mg of urethane decreased neuronal responsiveness similarly in both age groups.Therefore,urethane appears to exert similar effects on neuronal response properties of old and young adult animals.
文摘Objective: to study the clinical application effect of visual painless artificial abortion and conventional artificial abortion in artificial abortion. Methods: during the period from January 2018 to January 2020, 100 pregnant women who underwent artificial abortion in our hospital were selected as the research objects and randomly divided into the observation group and the control group with 50 in each group. The pregnant women in the observation group underwent visual painless artificial abortion, while those in the control group underwent conventional painless artificial abortion. The postoperative recovery, abortion and the probability of complications of the two groups were observed, and the advantages and disadvantages of the two surgical methods were analyzed. Results: comparing the data of the two groups, it can be seen that the operation time of abortion in the observation group is less than that in the control group, and the amount of hemorrhage in the operation is also less than that in the control group. The incidence of complications in the observation group is lower than that in the control group, and the satisfaction degree of pregnant women and their families to the operation is higher than that in the control group, P < 0.05. Conclusion: visual painless artificial abortion surgery can effectively increase the therapeutic effect compared with conventional abortion surgery, with shorter operation time, less bleeding during the operation and higher safety. It can also reduce complications and alleviate the pain of pregnant women, and is very worthy of promotion and use.
文摘Objective:To assess the effectiveness of a visual double-lumen bronchial catheter in teaching lung isolation skills to anesthesia resident trainees.Methods:Between September 2023 and September 2024,20 anesthesiology residents from Jiangsu Cancer Hospital were randomly divided into two groups:the visual double-lumen group(n=10)and the conventional double-lumen group(n=10).Randomization was achieved using a random number table.The study assessed several outcomes,including total intubation time,positioning time,one-time intubation success rate,intraoperative catheter displacement rate,surgeon satisfaction scores,and the incidence of postoperative complications(pharyngeal pain,hoarseness,and dry cough)within 24 hours.Results:The visual double-lumen group demonstrated superior results compared to the conventional double-lumen group in the following measures:total intubation time(70.2±11.8 s vs 224.9±35.6 s),positioning time(30.1±5.7s vs 176.6±26.4 s),one-time intubation success rate(85%vs 45%),intraoperative catheter displacement rate(10%vs 40%),surgeon’s intubation satisfaction score(8.10±1.07 vs 6.90±1.41),satisfaction score for pulmonary isolation(8.35±1.04 vs 6.55±1.36),and airway management satisfaction score(8.40±1.3 vs 6.70±1.34).Additionally,the incidence of postoperative pharyngeal pain(15%vs 45%),hoarseness(10%vs 40%),and dry cough(5%vs 35%)was significantly lower in the visual double-lumen group(all P<0.05).Conclusion:The visual double-lumen bronchial catheter significantly enhances the training of anesthesia residents in lung isolation by reducing intubation and positioning times,improving intubation success rate,increasing surgeon satisfaction,and reducing intubation-related complications.This method offers a more effective teaching approach compared to conventional techniques.
文摘Sensory drive predicts coevolution of mate choice signals with the sensory systems detecting those sig nals. Guppies are a classic model for sensory drive as mate preferences based on coloration differ across individuals and populations. A large body of work has identified variation in color vision, yet we lack a dir ect tie between how such variation in color vision influences variation in color preference. Here we bring together studies that have investigated guppy vision over the past 40years to： （1） highlight our current understanding of where variation occurs in the guppy color vision pathway and （2） suggest future ave nues of research into sources of visual system variation that could influence guppy color preference. This will allow researchers to design careful studies that couple measures of color preference with measures of visual system variation from the same individual or population. Such studies will finally provide im portant answers as to what sets the direction and speed of mate preference evolution via sensory drive.
基金This work was supported by the National Key Research and Development Plan(No.2016YFC0600908)the National Natural Science Foundation of China(No.61772530,U1610124)+1 种基金Natural Science Foundation of Jiangsu Province of China(No.BK20171192)China Postdoctoral Science Foundation(No.2016T90524,No.2014M551696).
文摘The colour feature is often used in the object tracking.The tracking methods extract the colour features of the object and the background,and distinguish them by a classifier.However,these existing methods simply use the colour information of the target pixels and do not consider the shape feature of the target,so that the description capability of the feature is weak.Moreover,incorporating shape information often leads to large feature dimension,which is not conducive to real-time object tracking.Recently,the emergence of visual tracking methods based on deep learning has also greatly increased the demand for computing resources of the algorithm.In this paper,we propose a real-time visual tracking method with compact shape and colour feature,which forms low dimensional compact shape and colour feature by fusing the shape and colour characteristics of the candidate object region,and reduces the dimensionality of the combined feature through the Hash function.The structural classification function is trained and updated online with dynamic data flow for adapting to the new frames.Further,the classification and prediction of the object are carried out with structured classification function.The experimental results demonstrate that the proposed tracker performs superiorly against several state-of-the-art algorithms on the challenging benchmark dataset OTB-100 and OTB-13.
基金Project(51274250)supported by the National Natural Science Foundation of ChinaProject(2012BAK09B02-05)supported by the National Key Technology R&D Program during the 12th Five-year Plan of China
文摘An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.
基金supported by the National Natural Science Foundation of China(No.90208013)Shanghai Leading Academic Project B111 and"211"Projectof Ministry of Education of China
文摘Neurons in the nervous system make connections with ascending feedforward projections and descending feedback projections,as well as projections from neural structures at the identical hierarchical level.These neurons form extremely complicated neural networks and pathways.Compared with the role of the feedforward projection,much less is known concerning the functional roles of the feedback projection.Visual cortex is a good model for studying functional roles of cortical feedback projections which involve many high functions,such as attention,searching and cognition.The present review mainly focused on the functional roles of feedback projections in the visual system.
文摘目的:基于文献计量学分析榄香烯相关研究领域的发展现状和发展态势。方法:从中国知网(CNKI)和Web of Science核心合集中检索2004—2024年榄香烯研究领域的相关文献,运用CiteSpace和VOSviewer进行文献计量学与可视化分析。结果:共纳入文献1 821篇,其中中文文献462篇,英文文献1 359篇。相比之下,英文文献发文量较大且总体呈逐年上升趋势。中英文发文量均为第一的作者为杭州师范大学的谢恬,其所在单位杭州师范大学也是英文文献发文量第一的科研机构。中英文关键词显示,榄香烯的研究热点主要集中于活性成分分析、榄香烯衍生产品和抗肿瘤作用。主要成分“β-榄香烯”为中英文文献中出现频数最高的关键词。结论:榄香烯相关研究领域目前仍处于上升阶段,发展前景良好,因此应深度剖析榄香烯的可能作用机制和临床应用,充分发挥其疗效优势和临床价值以推动中医药的传承创新发展。
