全文获取类型
收费全文 | 99篇 |
免费 | 4篇 |
专业分类
化学 | 42篇 |
晶体学 | 4篇 |
力学 | 2篇 |
数学 | 10篇 |
物理学 | 45篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 4篇 |
2008年 | 7篇 |
2007年 | 7篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1969年 | 1篇 |
1962年 | 2篇 |
排序方式: 共有103条查询结果,搜索用时 125 毫秒
81.
82.
Shixin Fa Keisuke Adachi Yuuya Nagata Kouichi Egami Kenichi Kato Tomoki Ogoshi 《Chemical science》2021,12(10):3483
Regulating the chirality of macrocyclic host molecules and supramolecular assemblies is crucial because chirality often plays a role in governing the properties of these systems. Herein, we describe pillar[5]arene-based chiral nanotube formation via pre-regulation of the building blocks'' chirality, which is different from frequently used post-regulation strategies. The planar chirality of rim-differentiated pillar[5]arenes is initially regulated by chiral awakening and further induction/inversion through stepwise achiral external stimuli. The pre-regulated chiral information is well stored in discrete nanotubes by interacting with a per-alkylamino-substituted pillar[5]arene. Such pre-regulation is more efficient than post-regulating the chirality of nanotubes.Pillar[5]arene-based chiral nanotube formation via pre-regulation of the building blocks'' chirality is more efficient than post-regulating the chirality of nanotubes. 相似文献
83.
A simple technique for fabrication of nonlinear gratings in polymer films, based on simultaneous embossing and poling, is proposed and demonstrated. A master grating consisting of a metal electrode with a dielectric die was fabricated and used for repeated embossing of the grating structures into nonlinear optical polymers at elevated temperatures. At the same time, we applied high voltage to the polymer films to induce second-order nonlinearity. The grating profile and the nonlinearity were estimated, as well as the mass productivity of nonlinear gratings. 相似文献
84.
Dr. Hiromichi Egami Prof. Dr. Yoshitaka Hamashima 《Chemical record (New York, N.Y.)》2023,23(7):e202200285
Fluorine is an attractive element in the field of pharmaceutical and agrochemical chemistry due to its unique properties. Considering the chiral environment in nature, where enantiomers often show different biological activities, the introduction of fluorine atom(s) into organic molecules to make chiral fluorinated compounds is an important subject. Herein, we describe the story of the development of our chiral carboxylate-based phase-transfer catalysts and their applications for asymmetric fluorocyclizations of alkenes bearing a carboxylic acid, an amide, and an oxime as an internal nucleophile with a dicationic fluorinating reagent, Selectfluor. We also describe dearomative fluorinations of indole derivatives, 2-naphthols, and resorcinols. 相似文献
85.
T. Egami 《Journal of Physics and Chemistry of Solids》2008,69(9):2191-2194
Underdoped cuprates are characterized by nano-scale complexity with strong spatial variation in the electronic properties, including superconductivity. It is often assumed that the stripe order underlies this spatial complexity, but the evidence of local stripe order in the superconducting phase is weak. We propose an alternative idea of electronically driven two-dimensional local order that leads to phase separation in the reciprocal space, which could be the basis for two-component superconductivity. 相似文献
86.
This paper is a study of three-dimensional (3D) micron/submicron fabrication with a continuous wave (CW) laser. The fabrication
forms vertical and horizontal hollow tubes in a photoresist film with nonlinear optical properties. We controlled beam intensities
and dose amounts to manipulate a reaction time constant of the photoresist; we fabricated the 3D hollows in high contrast. 相似文献
87.
A “Catch‐and‐Release” Protocol for Alkyne‐Tagged Molecules Based on a Resin‐Bound Cobalt Complex for Peptide Enrichment in Aqueous Media 下载免费PDF全文
Dr. Ayako Miyazaki Dr. Miwako Asanuma Dr. Kosuke Dodo Dr. Hiromichi Egami Prof. Dr. Mikiko Sodeoka 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(26):8116-8128
The development of new and mild protocols for the specific enrichment of biomolecules is of significant interest from the perspective of chemical biology. A cobalt–phosphine complex immobilised on a solid‐phase resin has been found to selectively bind to a propargyl carbamate tag, that is, “catch”, under dilute aqueous conditions (pH 7) at 4 °C. Upon acidic treatment of the resulting resin‐bound alkyne–cobalt complex, the Nicholas reaction was induced to “release” the alkyne‐tagged molecule from the resin as a free amine. Model studies revealed that selective enrichment of the alkyne‐tagged molecule could be achieved with high efficiency at 4 °C. The proof‐of‐concept was applied to an alkyne‐tagged amino acid and dipeptide. Studies using an alkyne‐tagged dipeptide proved that this protocol is compatible with various amino acids bearing a range of functionalities in the side‐chain. In addition, selective enrichment and detection of an amine derived from the “catch and release” of an alkyne‐tagged dipeptide in the presence of various peptides has been accomplished under highly dilute conditions, as determined by mass spectrometry. 相似文献
88.
Takeshi Egami Madhusudan Ojha Donald M. Nicholson Dmitri V. Louzguine-Luzgin Na Chen Akihisa Inoue 《哲学杂志》2013,93(6):655-665
The aluminum–gold system exhibits various features that suggest high glass formability, such as a deep eutectic, formation of icosahedral clusters in the intermetallic compound near the eutectic minimum and a strongly negative heat of mixing. However, it is very difficult to form a glass with this system. Various issues related to glass formability are discussed using the Al–Au system as a negative test-case. In particular, the atomic level pressure was calculated from first principles for the first time for Al2Au, AlAu2 and AlAu4 intermetallic compounds. The atomic level pressure is very high in these compounds, suggesting frustrated electronic states which destabilize both crystalline and glassy phases. 相似文献
89.
W. Dmowski M.K. AkbasT. Egami P.K. Davies 《Journal of Physics and Chemistry of Solids》2002,63(1):15-22
The relaxor ferroelectric compound Pb(Mg0.3Ta0.6Zr0.1)O3 (PMT-PZ) was studied by X-ray, neutron and electron diffraction and transmission electron microscopy in the as-sintered and annealed states. The as-sintered sample was comprised of nanometer-sized 1:1 chemically ordered domains dispersed in a disordered matrix. After annealing at 1325°C the domain size increased to ∼30 nm and the degree of order exceeded 95% in terms of the volume fraction of the ordered domains, yet the sample retained its diffuse, frequency dependent relaxor characteristics. Refinements of the chemically ordered structure using the Rietveld analysis revealed that the octahedral (B) site occupancies were in excellent agreement with a “random site” model for the chemical ordering. In this charge-balanced model for the 1:1 ordered Pb(β′1/2β″1/2)O3 structure the Ta cations predominantly occupy the β″ site, while the β′ site is populated by a random distribution of the Mg, Zr and remaining Ta cations. Large temperature factors for Pb and O atoms are observed in both as-sintered and annealed samples, indicating localized displacements of the Pb and O atoms. The mixed occupancy of the β′ position appears to be responsible for the relaxor characteristics in the dielectric response in spite of the growth of the chemical domains. 相似文献
90.