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101.
Nishino M 《Journal of nanoscience and nanotechnology》2006,6(6):1854-1856
Low dimensional strongly correlated systems have great potential for new quantum devices. Among them, quantum wires are actively investigated with development of new methods based on self-organized formation. For magnetic wires (chains), impurity doping, which causes inhomogeneity of magnetic interaction, can bring new magnetic properties to the systems. In the present study, the effect of inhomogeneity (defect) on magnetic chains with bond alternation is focused on. Defects induce local moments in the magnetic chains at low temperatures. However, depending on the relation of the distance between the defects, the magnetic profile is found to be drastically changed. 相似文献
102.
103.
Y. Toko T. Takahashi K. Miyamoto S. Yokoyama S. Takigawa S. Nishino N. Toshima S. Kobayashi 《Journal of the Society for Information Display》2008,16(9):957-960
Abstract— STN‐LCDs embedded with special metal nanoparticles of Ag/Pd are shown to be useful for a direct‐multiplexed dot‐matrix STN‐LCD with 320 × 240 pixels and show a fast response time by 3–5 times compared to those without nanoparticles. This phenomenon is shown to be attributed to the reduction of rotational viscosity by 70% at room temperature and by 30% at a low temperature (?20°C). The alteration of elastic constants by doping nanoparticles could be also essential. 相似文献
104.
Carboxyl-terminated single-walled carbon nanotubes (SWNTs) were successfully immobilized from solution phases onto the apexes of gold tips for scanning tunneling microscopy (STM). Gold STM tips were first modified with self-assembled monolayers of 4-mercaptobenzoic acid, and its carboxyl groups were used to anchor carboxylated SWNTs through Zn2+ ion-bridged coordination. These SWNT tips gave high-resolution STM images of a diether monolayer formed on the graphite surface. In addition and more importantly, the ether oxygens of the sample molecules were selectively observed as bright spots with the SWNT tips with significantly high reproducibility, which is due to the facilitation of electron tunneling through hydrogen bond interactions between the ether oxygens and carboxyl groups at the end of the SWNT tips. 相似文献
105.
We have fabricated semiconducting β-FeSi2 bulks without doping and with Mn and Co doping by using a pulse electric current sintering (PECS) method, and explored the possibility of a direct bonding of n-type and p-type β-FeSi2 bulks to form a p-n junction structure. P-type Mn-doped and n-type Co-doped β-FeSi2 bulks were obtained by an annealing process at 800-850 °C for 100 h. The PECS was applied to bond the n-type and p-type bulks together for forming a p-n junction structure. We confirmed that the bonding was processed without any change in the β-FeSi2 phase and was strongly joined with each other. Although we could not obtain the electrical characteristics of the p-n junction, Seebeck coefficients for n-type and p-type β-FeSi2 in the bonded sample were determined to be −356 and 778 μV/K, respectively. We propose that these results should lead to an expanded use of the sintered β-FeSi2 bulks in thermoelectric devices. 相似文献
106.
Hara K Nishino K Ikeuchi K 《IEEE transactions on pattern analysis and machine intelligence》2008,30(1):25-35
We present a method for simultaneously estimating the illumination of a scene and the reflectance property of an object from single view images - a single image or a small number of images taken from the same viewpoint. We assume that the illumination consists of multiple point light sources and the shape of the object is known. First, we represent the illumination on the surface of a unit sphere as a finite mixture of von Mises-Fisher distributions based on a novel spherical specular reflection model that well approximates the Torrance-Sparrow reflection model. Next, we estimate the parameters of this mixture model including the number of its component distributions and the standard deviation of them, which correspond to the number of light sources and the surface roughness, respectively. Finally, using these results as the initial estimates, we iteratively refine the estimates based on the original Torrance-Sparrow reflection model. The final estimates can be used to relight single-view images such as altering the intensities and directions of the individual light sources. The proposed method provides a unified framework based on directional statistics for simultaneously estimating the intensities and directions of an unknown number of light sources as well as the specular reflection parameter of the object in the scene. 相似文献
107.
108.
Bayesian Defogging 总被引:2,自引:0,他引:2
Ko Nishino Louis Kratz Stephen Lombardi 《International Journal of Computer Vision》2012,98(3):263-278
Atmospheric conditions induced by suspended particles, such as fog and haze, severely alter the scene appearance. Restoring
the true scene appearance from a single observation made in such bad weather conditions remains a challenging task due to
the inherent ambiguity that arises in the image formation process. In this paper, we introduce a novel Bayesian probabilistic
method that jointly estimates the scene albedo and depth from a single foggy image by fully leveraging their latent statistical
structures. Our key idea is to model the image with a factorial Markov random field in which the scene albedo and depth are
two statistically independent latent layers and to jointly estimate them. We show that we may exploit natural image and depth
statistics as priors on these hidden layers and estimate the scene albedo and depth with a canonical expectation maximization
algorithm with alternating minimization. We experimentally evaluate the effectiveness of our method on a number of synthetic
and real foggy images. The results demonstrate that the method achieves accurate factorization even on challenging scenes
for past methods that only constrain and estimate one of the latent variables. 相似文献
109.
面向Internet的中文新词语检测 总被引:16,自引:7,他引:16
随着社会的飞速发展,新词语不断地在日常生活中涌现出来。搜集和整理这些新词语,是中文信息处理中的一个重要研究课题。本文提出了一种自动检测新词语的方法,通过大规模地分析从Internet上采集而来的网页,建立巨大的词和字串的集合,从中自动检测新词语,而后再根据构词规则对自动检测的结果进行进一步的过滤,最终抽取出采集语料中存在的新词语。根据该方法实现的系统,可以寻找不限长度和不限领域的新词语,目前正应用于《现代汉语新词语信息(电子)词典》的编纂,在实用中大大的减轻了人工查找新词语的负担。 相似文献
110.
Naoki Nishino Keiko Miyase Mitsuaki Ohshima Hiro-omi Yokota 《Journal of the science of food and agriculture》1997,75(2):161-166
Primary growth of Italian ryegrass was fractionated into green juice and pressed cake (PC). PC was ensiled either directly or after reconstitution with the juice which was spray dried and then added to water before ensiling (RPC). This process was aimed at distinguishing between chemical (removal of nutrients) and physical (mechanical disintegration) effects of fractionation. Two additional wilted silages were prepared from long cut or chopped Italian ryegrass (WL and WC, respectively). The fermentative quality, digestion and in situ degradation of dry matter for the four silages were compared. WC, RPC and PC silages indicated lactate-rich fermentation while WL silage had a comparatively low lactate content. PC silage had a lower (P<0·05) pH value with lower (P<0·05) amounts of organic acids compared with WC and RPC silage, suggesting that removal of buffering components with the juice had greater effects than shredding on fermentation of PC silage. The digestibility of protein was lower (P<0·05) in PC than WL silage but the reduction was compensated for in RPC silage. Ruminal concentrations of total volatile fatty acids were the highest (P<0·05) when goats fed WL silage while those on the other silages had similar concentrations. Ruminal pH was lower (P<0·05) in goats fed PC than WC silage and the difference was not fully reversed by reconstituting the juice to PC. Juice extraction decreased (P<0·05) the soluble fraction and the rate of disappearance of dry matter in the rumen but the potential degradability was not different among treatments. These results suggest that both chemical and physical changes due to the fractionation affect the characteristics of digestion of PC silage while the removal of nutrients has a major role in the modified silage fermentation. © 1997 SCI. 相似文献