全文获取类型
收费全文 | 294篇 |
免费 | 12篇 |
国内免费 | 5篇 |
专业分类
化学 | 201篇 |
力学 | 7篇 |
数学 | 57篇 |
物理学 | 46篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 26篇 |
2021年 | 19篇 |
2020年 | 20篇 |
2019年 | 12篇 |
2018年 | 18篇 |
2017年 | 11篇 |
2016年 | 18篇 |
2015年 | 8篇 |
2014年 | 23篇 |
2013年 | 27篇 |
2012年 | 17篇 |
2011年 | 23篇 |
2010年 | 11篇 |
2009年 | 8篇 |
2008年 | 8篇 |
2007年 | 4篇 |
2006年 | 8篇 |
2005年 | 7篇 |
2004年 | 5篇 |
2003年 | 7篇 |
2002年 | 2篇 |
2000年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1974年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有311条查询结果,搜索用时 9 毫秒
81.
Bio-inspired sustainable synthesis of silver chloride nanoparticles and their prominent applications
Yuvraj Kashid Suresh Ghotekar Muhammad Bilal Shreyas Pansambal Rajeshwari Oza Rajender S. Varma Van-Huy Nguyen H.C. Ananda Murthy Dhananjay Mane 《印度化学会志》2022,99(5):100335
Advanced nanotechnology is an enormously growing area due to its massive scope of applications for diverse domains of applied science and engineering. Numerous types of synthetic procedures are utilized for the creation of nanoparticles (NPs) due to their myriad application scenarios. However, known conventional physical and chemical strategies have a number of shortcomings. Consequently, the designs of facile, clean, safer, non-noxious, reliable, inexpensive and eco-friendly processes for manufacturing of NPs are being explored actively to circumvent these barriers. The phytogenic fabrication of NPs is much safer, one-pot, facile, and a sustainable methodology. Hence, divergent biological means like the use of plants, biopolymers, fungi, fibres, bacteria, enzymes, etc., are pursued the procurable biogenic fabrication of metallic NPs. In this review paper, current findings on the bio-inspired fabrication of silver chloride nanoparticles (AgCl-NPs) are deliberated, which have with their useful appliances in assorted sectors. The experimental protocols, advanced characterization techniques along with diverse applications of biogenically synthesized AgCl-NPs have been highlighted. 相似文献
82.
Two-Qubit Steerability,Nonlocality, and Average Steered Coherence under Classical Dephasing Channels
When two qubits are prepared in a mixture of two Bell states and exposed to local transmission channels, the dynamics of steerability, Bell nonlocality, and average steered coherence are investigated. Disorders are assumed to influence the channels, resulting in either Markovian Ornstein–Uhlenbeck noise or non-Markovian static noise in two models: a single noisy channel or two local noisy channels. Their findings show that the type and number of classical channels, noise, and initial state must be in an optimal setting in order to preserve quantum correlations. 相似文献
83.
Let P(z) be a polynomial of degree n having all its zeros in |z| ≤ k. Fork = 1,it is known that for each r 0 and |α|≥ 1,n(|α|- 1) {∫2π0|P(eiθ)|rdθ}1/r 0r≤ {∫2π0|1+ eiθ|rdθ}1/rmax|z|=|Dα P(z)|.In this paper, we shall first consider the case when k ≥ 1 and present certain generalizations of this inequality. Also for k ≤ 1, we shall prove an interesting result for Lacunary type of polynomials from which many results can be easily deduced. 相似文献
84.
Roozbeh Hazrat 《Mathematische Zeitschrift》2010,264(2):295-299
Let A be an Azumaya algebra of constant rank n
2 over a Hensel pair (R, I) where R is a semilocal ring with n invertible in R. Then the reduced Whitehead group SK1(A) coincides with its reduction SK1(A/I A). This generalizes a result of Hazrat (J Algebra 305:687–703, 2006) to non-local Henselian rings. 相似文献
85.
The objective of this investigation was to verify the degradation of endrin by gamma irradiation. 60Co was used as radiation source for irradiation of 50 mg L?1 endrin with a varied dose of 1–6 kGy. High performance liquid chromatography (HPLC) coupled with diode array detector was used as an analytical technique to monitor the degradation rate along with numbers of degradation products formed. At dose rate of 6 kGy ≥99% of endrin was degraded. It is proposed that utilization of ionization radiations can be an effective and efficient tool for the removal of halogenated pesticides. 相似文献
86.
We use the variational method to establish criteria for the existence of conjugate points and for the oscillation property of the linear differential Sturm–Liouville equation. 相似文献
87.
Crystallization and Organic Field-Effect Transistor Performance of a Hydrogen-Bonded Quaterthiophene
Dr. Jan Gebers Dr. Bilal Özen Dr. Lucia Hartmann Michel Schaer Dr. Stéphane Suàrez Philippe Bugnon Dr. Rosario Scopelliti Dr. Hans-Georg Steinrück Dr. Oleg Konovalov Prof. Andreas Magerl Dr. Martin Brinkmann Dr. Riccardo Petraglia Dr. Piotr de Silva Prof. Clémence Corminboeuf Prof. Holger Frauenrath 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(45):10265-10275
Crystalline thin films of π-conjugated molecules are relevant as the active layers in organic electronic devices. Therefore, materials with enhanced control over the supramolecular arrangement, crystallinity, and thin-film morphology are desirable. Herein, it is reported that hydrogen-bonded substituents serve as additional structure-directing elements that positively affect crystallization, thin-film morphology, and device performance of p-type organic semiconductors. It is observed that a quaterthiophene diacetamide exhibits a denser packing than that of other quaterthiophenes in the single-crystal structure and, as a result, displays enhanced intermolecular electronic interactions. This feature was preserved in crystalline thin films that exhibited a layer-by-layer morphology, with large domain sizes and high internal order. As a result, organic field-effect transistors of these polycrystalline thin films showed mobilities in the range of the best mobility values reported for single-crystalline quaterthiophenes. The use of hydrogen-bonded groups may, thus, provide an avenue for organic semiconducting materials with improved morphology and performance. 相似文献
88.
J. Rothhardt M. Bilal R. Beerwerth A.V. Volotka V. Hilbert T. Stöhlker S. Fritzsche J. Limpert 《X射线光谱测定》2020,49(1):165-168
We propose to measure the lifetime of short-lived excited states in highly charged ions by pump-probe experiments. Utilizing two synchronized and delayed Femtosecond pulses allows accessing these lifetimes with Femtosecond precision. Such measurements could provide sensitive tests of state-of-the art atomic structure calculations beyond the capabilities of established methods. 相似文献
89.
90.
We use four-level atomic system and control the wave propagation via forbidden decay rate. The Raman gain process becomes dominant on electromagnetically induced transparency (EIT) medium by increasing the forbidden decay rate via increasing the number of atoms [G.S. Agarwal and T.N. Dey, Phys. Rev. A 74 (2005) 043805 and K. Harada, T. Kanbashi, and M. Mitsunaga, Phys. Rev. A 73 (2006) 013803]. The behavior of wave propagation is dramatically changed from normal (subluminal) to anomalous (superluminal) dispersion by increasing the forbidden decay rate. The system can also give a control over the group velocity of the light propagating through the medium via Kerr field. 相似文献