共查询到19条相似文献，搜索用时 312 毫秒
1.
Jacci Howard 《海外英语》2006,(6):19
Calm and Cool平静与冷酷 Blue is calming. It can be strong and steadfast or light and friendly. Almost everyone likes some shade of the color blue. Nature of Blue蓝色的本性 A natural color, from the blue of the sky, blue is a universal color. The cool, calming effect of blue makes time pass more quickly and it can help you sleep. Blue 相似文献
2.
In order to compare two kinds of blue electroluminescent materials,we have investigated two kinds of blue OLEDs with the similar structure ITO/CuPc/NPB/JBEM:perylene/Alq/Mg:Ag[device(J)] and ITO/CuPc/NPB/DPVBi:perylene/Alq/Mg:Ag[device(D)].The difference of luminance and efficiency was not obvious for the two devices,However,there was remarkable difference for their lifetime.The device(J) achieved longer half lifetime of 1035h at initial luminance of 100 cd/m^2,and that of device(D) was only255h,According to their energy level diagrams,the differentce of their stability may originate from different host materials in the two devices.It may be attributed to the better thermal stability of JBEM molecues than that of DPVBi.It is shown that JBEM may be a promising blue organic electroluminescent material with great stability. 相似文献
3.
Variable refractive index in environment matte 总被引：1，自引：0，他引：1
ZHAO Ming-tian XIAO Shuang-jiu YANG Xu-bo MA Li-zhuang 《浙江大学学报(A卷英文版)》2006,7(7):1160-1167
INTRODUCTION Digital matting and compositing is a popular technique in the film industry, with which we can separate a foreground object, including both its color and opacity, from a background image. The descrip- tion of the separated foreground object is named digital matte. Smith and Blinn (1996) proposed the blue screen matting technique. They formally de- scribed the mathematical solution to the digital mat- ting problem, when either some constraints on the foreground color or a pair… 相似文献
4.
5.
To sharpen the imaging of structures, it is vital to develop a convenient and efficient quantitative algorithm of the optical coherence tomography (OCT) sampling. In this paper a new Monte Carlo model is set up and how light propagates in bio-tissue is analyzed in virtue of mathematics and physics equations. The relations,in which light intensity of Class I and Class 2 light with different wavelengths changes with their permeation depth ,and in which Class I light intensity (signal light intensity) changes with the probing depth, and in which angularly resolved diffuse reflectance and diffuse transmittance change with the exiting angle, are studied. The results show that Monte Carlo simulation results are consistent with the theory data. 相似文献
6.
In the novel The Color Purple,purple is a color that Alice Walker uses to symbolize the main character:Celie.In color psychology,purple is a complex color.At first,it has two contradictory symbolic meanings just as Celie’s personality.Secondly,purple is a color which blends blue and red.In western countries,red symbolized man and blue symbolized woman.However,Celie is a person who has both man’s and woman’s characteristics.At last,purple is a changeable color.Celie’s early misery life is like dark purple which has more of a passive meaning.And her later life turns out to be light purple which symbolizes more of the beautiful things.And the turning of her life may be viewed as awakening of womanism. 相似文献
7.
二阶Krylov子空间及Arnoldi过程 总被引：1，自引：0，他引：1
We report our recent work on a second-order Krylov subspace and the corresponding second-order Arnoldi procedure forgenerating its orthonormal basis. The second-order Krylov subspace is spanned by a sequence of vectors defined via a second-orderlinear homogeneous recurrence relation with coefficient matrices A and B and an initial vector u. It generalizes the well-knownKrylov subspace h‘n( A ; v), which is spanned by a sequence of vectors defined via a first-order linear homogeneous recurrence relation with a single coefficient matrix A and an initial vector v. The applications are shown for the solution of quadratic eigenvalueproblems and dimension reduction of second-order dynamical systems. The new approaches preserve essential structures and properties of the quadratic eigenvalue problem and second-order system, and demonstrate superior numerical results over the common approaches based on linearization of these second-order problems. 相似文献
8.
A new study shows that large amounts of vitamins and minerals can slow the loss of sight linked to aging. The condition is called age related macular degeneration (衰退) or A-M-D. The disease is a major cause of blindness among old people. Doctors do not know what causes it. The disease destroys the central part of the retina(视网膜), the cells at the back of the eye that gather light. The first sign of A-M-D usually is a loss of visual clearness. People with the disease have trouble reading, driving and recognizing faces. They cannot see clearly through the center of their eyes. They must 相似文献
9.
Principle of Coordinates Acquisition Based on Single Camera 总被引：1，自引：0，他引：1
The principle and accuracy of 3-D coordinates acquistition using one single camera and the Aided Measuring Probe(AMP0are discussed in this paper,Using one single camera and one AMP which has several embedded targets and one tip with known coordinates.the single camera‘s orientation and location can be calculated.After orientation.the global coordinate system is obtained.During measurement.the camera is fixed firstly.then the AMP is held and the feature point is touched.The camera is triggered lastly.The position and orientation of the AMP are therefore calculated from the size and position of its image on the sensor.Since the tip point of AMP has known relation with the embedded targets.the feature point can be measured.Tests show that the accuracy of length measurement is 0.2 mm and accuracy for flatness measurement in XSY-plane is 0.1mm. 相似文献
10.
The morphology and ultrastructure of Bullacta exarata spermatozoa observed by light and transmission electron microscopy are presented in this paper. The spermatozoon is composed of head with a simple acrosomal complex and an elongated nucleus, and tail with a midpiece, principal piece and an end piece. The midpiece consists of a mitochondrial ring, and the principal piece is composed of axoneme and lateral fin. The structure of 5. exarata spermatozoa differs significantly from that of other gastropods, especially in the lateral fin and the principal piece, which was described scarcely before. A comparison is made between B. exarata and other gastropods, and its significance on reproductive evolution and physio-ecological adaptation is preliminarily discussed. 相似文献
11.
We have fabricated high-efficient white organic light-emitting diodes (WOLEDs) using two types of electron transport materials
with different electron mobility. The effect of the electron mobility on the device performance is discussed. In addition,
to generate the desired white emission and high color rendering index, we perform the structure design of OLED, in which the
functions of co-host of blue and green dopants on chromatic-stability are investigated. Experimental results find that the
maximum color rendering index reaches as high as 91 at the voltage of 8 V. 相似文献
12.
介绍一种便携式色度仪的设计方案．采用该方案的色度仪可测量颜色的色品坐标、色差、照度以及主波长等参数．该仪器采用单片机技术，配有标准串行口，可外接串行打印机，具有体积小、重量轻、功耗低等特点． 相似文献
13.
D. J. Zerbolio 《Learning & behavior》1985,13(3):269-273
Goldfish, trained in the shuttlebox apparatus to avoid shock, acquired a color discrimination between two colors (red/green) and were tested in transfer with a new set of colors (yellow/blue). Transfer color shock-pairing was either consistent with (red=yellow, blue=green) or opposite to (red≠ yellow, green≠blue) categorical color coding seen in pigeons. Groups with transfer shock-pairing consistent with categorical color coding showed positive transfer, and groups with transfer shock-pairing opposite to categorical color coding showed negative transfer, similar to an attenuated reversal learning effect. These results indicate that goldfish, like pigeons, code different colors as behavioral equivalents even though they can easily learn to discriminate between them. As with pigeons, the finding of the categorical color coding phenomenon changes the conclusions drawn from earlier goldfish conditional-discrimination transfer studies using only signal color changes between acquisition and transfer testing, from evidence of concept learning to evidence for categorical color coding, on the grounds of parsimony. It is important to note that this finding affects only the explanation of conditional-discrimination transfer effects, and the fact remains that both pigeons and goldfish can learn to conditionally discriminate—pigeons for positive reinforcement, and goldfish to avoid shock. 相似文献
14.
采用真空热蒸镀法,以热活化延迟荧光(TADF)材料为主体材料、发光材料为客体材料制备混合薄膜发光层,以提高蓝色荧光材料的OLED发光效率。当OLED器件结构为ITO/HAT-CN(5 nm)/TAPC(30 nm)/TCTA(10 nm)/Blue-Or:DMAC-DPS(30%,30 nm)/DPEPO(10 nm)/Bphen(30 nm)/LiF(1 nm)/Al(70 nm)时,器件的光电性能最佳。此蓝光TADF-OLED器件的外量子效率为12.39%,电流效率为21.68 cd/A,功率效率为19.44 lm/W。研究发现改变TADF-OLED的掺杂主体材料和添加空穴注入层均可有效地提高器件的光电特性。实验内容与该领域的前沿科学研究相结合,OLED器件的光电性能稳定、实验现象显著,适于引入本科实验课程。通过该综合实验学生可以夯实实验基础、了解研究热点、掌握最新的科研动态。 相似文献
15.
郝文华 《郧阳师范高等专科学校学报》2010,30(5):43-45
＂青＂是个表示颜色的词。其特殊之处在于,它反映了植物生长过程中颜色的变化：白里透红、浅绿、深绿。同时,它又有自己的发展轨迹,顺着颜色的深浅继续发展,表示浅蓝、深蓝甚至黑色。因此它几乎能表示各种颜色。而在＂白里透红＂的意义上,更是引申出了不少意义。 相似文献
16.
Four colors (red, yellow, green, and blue) were arranged in all possible two-color sets to determine if goldfish can discriminate between color sets associated with shock and color sets associated with safety/shock omission in a one-phase (linear presentation) discrimination-learning procedure. The results showed that goldfish learned to discriminate between two-color sets if set colors were natural categorical color-code mates (red = yellow and green = blue). When natural code mates were not in the same set, and therefore were paired with different shock consequents, no discrimination learning occurred, suggesting that goldfish, unlike pigeons, are not able to code colors arbitrarily. The method also allowed a measure of preference between colors within sets associated with safety/shock omission. Original-learning preference measures between colors in sets so associated showed that goldfish chose red over any other color, yellow over blue or green, and green over blue, despite the fact that both colors in any set were procedurally identical, implying that goldfish do discriminate between colors in the absence of explicit discrimination training. The goldfish that failed to discriminate between red/blue and green/yellow sets in original learning were transferred to red/yellow and blue/green color sets. In transfer, the color paired with safety/shock omission in original learning was preferred over the color paired with shock in original learning, which resulted in a reversal of original-learning color preferences for half the goldfish. The transfer color-preference results imply that the goldfish had associated specific colors with specific shock consequents, but the associations were not robust enough to support discrimination learning in the face of categorical color coding. 相似文献
17.
一直以来,建筑动画专业的教学内容偏重于技术的展示,而忽略了画面色彩表现,因此,作品难以得到市场认可,文章从实际出发,仔细剖析人才培养的现状,提出了基于CIE色彩理论如何运用光、色和影调来加强作品的艺术表现力和感染力的方法,从而提高动画作品质量。 相似文献
18.
A novel reversible photochromic nanocomposite film based on a hybrid inorganic-organic matrix in which heteropolyacid H4SiW12O40 （SiWA） was entrapped in Si-O-Ti network was prepared. Structure, photochromic behaviors and mechanism of the film were investigated by means of infrared spectroscopy （IR）, ultraviolet-visible （UV-Vis） absorption spectra and electron spin resonance （ESR）. The results showed that heteropolyanion i.e. SiW12O^4- 40 （SiW12）, maintained a Keggin structure in the film and there was a strong interaction between anion SiW12 and cation R-NH^＋3 （R=link of hybrid composite）. The photochromic properties of the composite film originated from reversible charge transfer between the anions and cations. Under UV irradiation, the anion would be reduced via one-electron step with simultaneous oxidation of the cation, accompanied by a color change from colorless to blue. Bleaching could occur when the film was in contact with ambient air or 02 in the dark. 相似文献
19.
WANG Dong-ming Zhang Bu-xin SUN Ling-ling JIANG Xue-yin ZHANG Zhi-lin XU Shao-hong MA Chang-qi WANG Jian-hua ZHANG Bao-wen School of Material Science Engineering Shanghai University Shanghai China Institute of Photographic Chemistr 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionOrganic electrolUminescent (EL) devices have beenexpected tO serve as a new ace of flat display since Tangand co-workerS first reposed high-perfonnance orgallicEL devices.["2] Their success was based on a multilayerstrUctUre which had an emitting layer and a caberdisPOrting layer. F~rmore, Adachi and co-workersdeVeloped the multilayer strUctUre and Proposed threefimdamental strUctUres for orghoc EL devices, namelythe single hetero-A (SH-A), single hetero-B (SH-B) andd… 相似文献