检索结果-南通市图书馆

Effects of Modular Threshing and Redrying on color difference and Polyphenols of Tobacco Leaves

在线全文

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2022年第6期11卷 71-73,77页

作者： Haitao LUO Jingxin LI Zhouying REN Huaiqi LI Hongfei YIN Bing ZENG Dong CHEN Jiafeng QUAN Yanqiu JING Enkai ZOU Chaoqi RAO China Jiangxi Tobacco Industrial Co. Ltd.Nanchang 330096China College of Tobacco Henan Agricultural UniversityZhengzhou 450000China China Tobacco Henan Industrial Co. Ltd.Zhengzhou 450002China

[Objectives]This study was conducted to analyze changes of color difference and polyphenols and their relationship in the process of threshing and redrying.[Methods]The change trends of color difference parameters L,a,b,H^(0),C and polyphenol contents in tobacco leaves in the middle leaf module and the Pearson correlation between them were analyzed.[Results]During threshing and redrying,L and H^(0)of tobacco showed a decreasing trend,but H^(0)changed slightly;the values of a and C showed an inverted"S"change trend,and the differences between various processes were significant;and the value of b decreased first and then *** content of chlorogenic acid and scopoletin decreased first,then increased,and then decreased during threshing and redrying;rutin content showed a significant decreasing *** value of L was in an extremely significant positive correlation with rutin content;the value of a was in an extremely significant negative correlation with chlorogenic acid content;b value was also significantly correlated with rutin;and H^(0)was in significant correlation and extremely significant correlation with rutin and total polyphenols,respectively.[Conclusions]This study provides technical support for online detection of tobacco leaf components by the color difference method and for the homogenization of threshing and redrying.

关键词： Redrying leaves Module tobacco leaves color difference Polyphenol Correlation analysis

Study on the Matching Method of Tooth color Based on color difference

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

Study on the Matching Method of Tooth Color Based on Color D...

Evaluate Acceptability Threshold and Weighting for color difference on Gloss Paper Reproduction

2010 First International Conference on Cellular,Molecular Biology, Biophysics and Bioengineering(CMBB 2010)

作者： Chunnan Li 1,2 1.Medical College,Jinggangshan University 2.College of Stomatology,The Fourth Military Medical University 1.Ji’an,Jiangxi Province,China 2.Xi’an,Shanxi Province,China Hongxia Zhao,Zhiyang Luo and Xin Yuan Engineering College Jinggangshan University Ji’an,Jiangxi Province,China

It is very necessary to determine tooth color quantitatively with scientific instrument in order to make objective *** to colorimetry theory,tooth color was determined by the PR-655 SpectraScan colorimeter and computer,test conditions chose D65 light source,normal direction illumination,and 0/45 observation. The consistent conclusions are gotten through comparing with VITA3D-Master shade guides by Experts and determined by PR-655 SpectraScan *** the determination method can realize the color matching between restoration and natural tooth to a great extent,and a definite foundation is established for the clinical research.

关键词： teeth color color difference colorimetry shade guide

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Evaluate Acceptability Threshold and Weighting for Color Dif...

Study on color difference estimation method of medicine biochemical analysis

第一届图像传播国际会议

作者： Phil Green College of Packaging and Printing Engineering Tianjin University of Science ＆ Technology color Imaging Group London College of Communication

＜正＞In this paper, The visual results were used to derive, for each color centre, optimum 1:c weightings by multiple linear logistic regression, and tolerance thresholds by minimization of instrumental wrong decisions.

关键词： color difference CIE94 CMC CIE2000 weighting Threshold

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on color difference estimation method of medicine bioc...

Effects of Target and Distractor Saturations on the Cognitive Performance of an Integrated Display Interface

20th Congress of the International Commission for Optics

作者： Wang chunhonga, b1, Zhou Yuec, Zhao Hongxiaa, Sun jiashia, and Zhou fengkunaa State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun , China b Suihua College, Suihua, Heilongjiang, China c Beijing Institute for Cancer Research, Medical Center, Beijing University, Beijing, China

The biochemical analysis in medicine is an important inspection and diagnosis method in hospital clinic. The biochemical analysis of urine is one important item. The Urine test paper shows correspondi

关键词： Medicine biochemical analysis Urine color difference color digital camera

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2015年第1期28卷 208-216页

作者： XUE Chengqi LI Jing WANG Haiyan NIU Yafeng College of Mechanical Engineering Southeast University

color coding is often used to enhance decision quality in complex man-machine interfaces of integrated display systems. However, people are easily distracted by irrelevant colors and by the numerous data points and complex structures in the interface. Although an increasing number of studies are seriously focusing on the problem of achieving efficient color coding, few are able to determine the effects of target and distractor saturations on cognitive performance. To study the performances of target colors among distractors, a systematic experiment is conducted to assess the influence of high and low saturated targets on cognitive performance, and the affecting extent of different saturated distractors of homogeneous colors on targets. According to the analysis of the reaction time through the non-parametric statistical method, a calculation method of the cognitive performance of each color is proposed. Based on the calculation of the color differences and the accumulation of the reaction times, it is shown that with the different saturated distractors of homogeneous colors, the high saturated yellow targets perform better than the low saturated ones, and the green and blue targets have moderate performances. When searching for a singleton target placed oll a black background, the color difference between the target and the distractor should be more than 20AE＊ab units in the yellow saturation coding, whereas the color difference should be more than 40△E＊ab units in the blue and green saturation coding. In addition, as regards saturation coding, the influence of the color difference between the target and the background on cognitive performance is greater than that of the color difference between the target and the distractor. Seemingly, the hue attribute determines whether the saturation difference between the target and the distractor affects thc cognitive performance. Based on the experimental results, the simulation design of the instrument dials in a flight situ

关键词： cognitive performance saturation level target color distractor color color difference

Assessing total differences for effective samples having variations in color,coarseness,and glint

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第7期8卷 717-720页

作者：黄中宁徐海松 M. Ronnier Luo Guihua Cui 冯华君 State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China Department of color Science University of Leeds Leeds LS2 9JT UK

Effect coatings have the unique property of large change of appearance under different viewing conditions. This results in quality control problems of related products. In this letter, samples of metallic panels with effect coatings are visually assessed and measured. Based on experimental results, we propose formulae to predict precisely the total differences of effective samples in terms of variations in color, coarseness, and glint. Under diffused illumination, the total difference formula includes color difference and coarseness difference. Under directional illumination, the total difference formula includes color difference and glint difference.

关键词： color color difference color vision Illumination Metallic coatings Standard observers

Linked color imaging vs Lugol chromoendoscopy for esophageal squamous cell cancer and precancerous lesion screening: A noninferiority study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第12期29卷 1899-1910页

作者： Zi-Xin Wang Long-Song Li Song Su Jin-Ping Li Bo Zhang Nan-Jun Wang Sheng-Zhen Liu Sha-Sha Wang Shuai Zhang Ya-Wei Bi Fei Gao Qun Shao Ning Xu Bo-Zong Shao Yi Yao Fang Liu En-Qiang Linghu Ning-Li Chai Department of Gastroenterology The First Medical Center of Chinese PLA General HospitalBeijing 100853China

BACKGROUND Lugol chromoendoscopy(LCE)has served as a standard screening technique in high-risk patients with esophageal ***,LCE is not suitable for general population screening given its side *** color imaging(LCI)is a novel image-enhanced endoscopic technique that can distinguish subtle differences in mucosal *** To compare the diagnostic performance of LCI with LCE in detecting esophageal squamous cell cancer and precancerous lesions and to evaluate whether LCE can be replaced by LCI in detecting esophageal neoplastic *** In this prospective study,we enrolled 543 patients who underwent white light imaging(WLI),LCI and LCE *** compared the sensitivity and specificity of LCI and LCE in the detection of esophageal neoplastic *** features and color analysis of lesions were *** In total,43 patients(45 neoplastic lesions)were *** them,36 patients(38 neoplastic lesions)were diagnosed with LCI,and 39 patients(41 neoplastic lesions)were diagnosed with *** sensitivity of LCI was similar to that of LCE(83.7%vs 90.7%,P=0.520),whereas the specificity of LCI was greater than that of LCE(92.4%vs 87.0%,P=0.007).The LCI procedure time in the esophageal examination was significantly shorter than that of LCE[42(34,50)s vs 160(130,189)s,Pcolor difference between the lesion and surrounding mucosa in LCI was significantly greater than that observed with ***,the color difference in LCI was similar in different pathological types of esophageal squamous cell *** LCI offers greater specificity than LCE in the detection of esophageal squamous cell cancer and precancerous lesions,and LCI represents a promising screening strategy for general populations.

关键词： Linked color imaging Lugol chromoendoscopy Esophageal squamous cell cancer Precancerous lesions color difference

New LED light source system with uniform illumination for line-scan CCD imaging systems

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

Journal of Beijing Institute of Technology 2016年第4期25卷 571-574页

作者：张莲莲黄庆梅李心怡胡维贵刘南渤陆爱民 National Laboratory of color Science and Engineering School of OptoelectronicsBeijing Institute of TechnologyBeijing 100081China SINOMV Technology Co.Ltd Beijing 100091China

A system with uniform light reflection in the inner surface within a horizontal 2/3 cylindrical structure for line-scan CCD of the print testing was designed. The design was based on diffuse reflection uniformity of the integrating sphere and requirement of the strip uniform illumination region. This system was called dome light. White light LED array light sources were used for uniform illumi- nation. The LEDs were filtrated to composite array light source based on coefficient of variation of a single LED. The standard white board and SG color checkers were used in the line-scan CCD imaging experiments under the dome light and ordinary illumination light source. The average color difference （AE） of SG color checkers in CIELAB space was 2. 091 under the dome light and 2. 286 under ordinary illumination light source respectively. Experimental results indicate that the dome light can satisfy illumination uniformity and color rendering consistency for line-scan CCD and provide a standard light source for uniform calibration of different cameras.

关键词： line-scan CCD uniform illumination white light LED coefficient of variation arraylight source color difference

Influence of different post core materials on the color of Empress 2 full ceramic crowns

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2006年第20期119卷 1715-1720页

作者： GE Jing WANG Xin-zhi FENG Hai-lan Department of Prosthodontics School and Hospital of StomatologyPeking University Beijing 100081 China

Background For esthetic consideration, dentin color post core materials were normally used for all-ceramic crown restorations. However, in some cases, clinicians have to consider combining a full ceramic crown with a metal post core. Therefore, this experiment was conducted to test the esthetical possibility of applying cast metal post core in a full ceramic crown restoration.Methods The color of full ceramic crowns on gold and Nickel-Chrome post cores was compared with the color of the same crowns on tooth colored post cores. Different try-in pastes were used to imitate the influence of a composite cementation on the color of different restorative combinations. The majority of patients could not detect any color difference less than △E 1.8 between the two ceramic samples. So, △E 1.8 was taken as the objective evaluative criterion for the evaluation of color matching and patients＇ satisfaction. Results When the Empress 2 crown was combined with the gold alloy post core, the color of the resulting material was similar to that of a glass fiber reinforced resin post core （△E = 0.3）. The gold alloy post core and the try-in paste did not show a perceptible color change in the full ceramic crowns, which indicated that the color of the crowns might not be susceptible to change between lab and clinic as well as during the process of composite cementation. Without an opaque covering the Ni-Cr post core would cause an unacceptable color effect on the crown （△E = 2.0）, but with opaque covering, the color effect became more clinically satisfactory （△E = 1.8）. Conclusions It may be possible to apply a gold alloy post core in the Empress 2 full ceramic crown restoration when necessary. If a non-extractible Ni-Cr post core exists in the root canal, it might be possible to restore the tooth with an Empress 2 crown after covering the labial surface of the core with one layer of opaque resin cement.

关键词： color difference ceramic crown post core try-in paste