全文获取类型
收费全文 | 330篇 |
免费 | 11篇 |
专业分类
化学 | 216篇 |
晶体学 | 1篇 |
力学 | 7篇 |
数学 | 13篇 |
物理学 | 49篇 |
无线电 | 55篇 |
出版年
2022年 | 7篇 |
2021年 | 2篇 |
2020年 | 8篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 8篇 |
2016年 | 19篇 |
2015年 | 6篇 |
2014年 | 10篇 |
2013年 | 20篇 |
2012年 | 28篇 |
2011年 | 15篇 |
2010年 | 9篇 |
2009年 | 11篇 |
2008年 | 28篇 |
2007年 | 16篇 |
2006年 | 19篇 |
2005年 | 19篇 |
2004年 | 8篇 |
2003年 | 10篇 |
2002年 | 15篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1994年 | 1篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1965年 | 3篇 |
1936年 | 4篇 |
排序方式: 共有341条查询结果,搜索用时 15 毫秒
181.
Williamson W. III Enquist S.B. Chow D.H. Dunlap H.L. Subramaniam S. Peiming Lei Bernstein G.H. Gilbert B.K. 《Solid-State Circuits, IEEE Journal of》1997,32(2):222-231
We report on the successful demonstration of a functionally complete set of logic gates based on resonant interband tunneling diodes (RITDs) with a maximum operating frequency in excess of 12 GHz. At this high frequency of operation, the power dissipation is remarkably low-on the order of 0.5 mW per gate. The circuits for all gates, AND, OR, XOR, and INV, shared the same layout geometry, consisting of two Schottky diodes and three RITDs. Logical functionality was determined solely by varying the relative areas of the devices 相似文献
182.
Subramaniam V. De Brabander G.N. Naghski D.H. Boyd J.T. 《Lightwave Technology, Journal of》1997,15(6):990-997
Curved, single-mode, silicon oxynitride optical ridge channel waveguides have been characterized by measuring mode field profile alteration, bending loss, and transition loss. The results were compared to theoretical calculations. Near field imaging of the channel mode field profiles showed the effect of bend radius on mode shape. Good agreement was obtained between the measurements and profiles obtained from two-dimensional (2-D) beam propagation method calculations. The exponential dependence of bending loss on bend radius and the variation of transition loss on the lateral offset between channels having different bend radius were successfully modeled by two simple theories 相似文献
183.
184.
Ma Y Rajendran P Blum C Cesa Y Gartmann N Brühwiler D Subramaniam V 《Journal of colloid and interface science》2011,356(1):123-130
The infiltration of enhanced green fluorescent protein (EGFP) into nanochannels of different diameters in mesoporous silica particles was studied in detail by fluorescence microspectroscopy at room temperature. Silica particles from the MCM-41, ASNCs and SBA-15 families possessing nanometer-sized (3-8 nm in diameter) channels, comparable to the dimensions of the infiltrated guest protein EGFP (barrel structure with dimensions of 2.4 nm × 4.2 nm), were used as hosts. We found that it is necessary to first functionalize the surfaces of the silica particles with an amino-silane for effective encapsulation of EGFP. We demonstrated successful infiltration of the protein into the nanochannels based on fluorescence microspectroscopy and loading capacity calculations, even for nanochannel diameters approaching the protein dimensions. We studied the spatial distributions of the EGFPs within the silica particles by confocal laser scanning microscopy (CLSM) and multimode microscopy. Upon infiltration, the fluorescence lifetime drops as expected for an emitter embedded in a high refractive index medium. Further, the spectral properties of EGFP are preserved, confirming the structural integrity of the infiltrated protein. This inorganic-protein host-guest system is an example of a nanobiophotonic hybrid system that may lead to composite materials with novel optical properties. 相似文献
185.
R. Srinivasan V. Sankaranarayanan C. K. Subramaniam Prakash Fortunata Rajam S. Kasiviswanathan Vijayashree Radhakrishnan 《Phase Transitions》2013,86(1-3):87-95
Abstract Resistance and thermopower measurements have been made on a series of compounds, YBa2Cu3- x Zn x O7-y, with x = 0.025, 0.05, 0.1, 0.15 and 0.2. The superconducting transition temperature decreases as the zinc concentration increases. In a range of temperatures below TM , the mid point of the transition, the resistance shows an exponential temperature dependence fitting the phenomenological formula proposed by Ausloos et al. From the plot of logarithm of resistivity vs. (TM ? T) 1/2/T, one deduces a value of the average dimension of the Josephson junction to be a few tens of Å, suggesting the microtwin boundaries to be the location of the junctions. The thermopower shows a peak always just above Tc . This conclusively shows that phonon drag is not the cause of the peak. The temperature dependence of the thermopower appears to resemble closely the earlier observations of Srinivasan et al. on yttrium barium copper oxide. Single-particle tunneling measurements carried out for two concentrations, x = 0 and 0.05, appear to indicate that the energy gap parameter scales with Tc , and 2Δ/kTc has an approximate value of 5.5. 相似文献
186.
A Mixed Line Rate (MLR) optical network is a good candidate for a core back-bone network because of its ability to provide diverse line rates to effectively accommodate traffic demands with heterogeneous bandwidth requirements. Because of the deleterious effects of physical impairments, there is a maximum transmission reach for optical signals before they have to be regener-ated. Being expensive devices, regenerators are expected to be sparsely located and used in such a network, called a translucent optical network. In this paper, we consider the Grooming, Routing, and Wavelength Assignment (GRWA) problem so that the Quality of Transmission (QoT) for connections is satisfied, and the network-level performance metric of blocking probability is minimized. Cross-layer heuristics to effectively allocate the sparse regenerators in MLR networks are developed, and extensive simulation results are presented to demonstrate their effectiveness. 相似文献
187.
Radhwan M. Abdullah Azizol Abdullah Nor Asilah Wati Abdul Hamid Mohamed Othman Shamala Subramaniam 《Wireless Personal Communications》2014,77(3):1733-1750
The management process between different wireless technologies for mobile devices is very important to complete the handover operations. The handover operation needs to determine the delay and packet loss in order to be the quality of service within a certain level. Selecting the best available network at the appropriate time is very significant in the direction of realizing ubiquitous networks. In this paper a network selection approach named enhanced access router discovery (EARD) is proposed. The approach is developed to work in a heterogeneous environment including of WiMAX and WLAN networks. The EARD method utilizes the prioritized rating for multiple criteria (PRMC) proposed for selecting the target network. The proposed approach is evaluated with respect to various conditions with different traffic types. The simulation results show that our proposed approach outperform the traditional network selection methods is selecting the most appropriate network. 相似文献
188.
Let G be a simple algebraic group of adjoint type over the field of complex numbers, B be a Borel subgroup of G containing a maximal torus T of G. Let w be an element of the Weyl group W and be the Schubert variety in corresponding to w. In this article we show that given any parabolic subgroup P of G containing B properly, there is an element such that P is the connected component, containing the identity element of the group of all algebraic automorphisms of . 相似文献
189.
Hemalatha T Mala VV Manohar BM Nayeem M Subramaniam S Puvanakrishnan R 《Cryo letters》2006,27(5):311-318
Cryoinfarction in rats was carried out by placing the cooled probe directly on the midway of left anterior descending coronary artery. This caused damage to the blood vessel, hindering blood flow to the distal part of the left ventricle. Gross pathology showed around 26% infarction at 24 h. Histopathology revealed death of cardiomyocytes with blood vessel congestion at the end of 24 h, inflammatory infiltrate at 48 h, fibrotic scar by 96 h and collagen deposition by 192 h. Acute myocardial infarction biomarkers such as Cardiac Troponin T, Creatine Kinase MB and NT pro BNP were shown to be elevated by 4 h. ECG showed an ST segment elevation by 96 h. This cryoinfarction model was suitable to study changes taking place during acute myocardial infarction in humans. 相似文献
190.
Maher A. Al-Sanabani Subramaniam K. Shamala Mohamed Othman Zuriati A. Zukarnain 《Wireless Personal Communications》2008,46(2):143-163
Next generation of wireless cellular networks aim at supporting a diverse range of multimedia services to Mobile Terminal
(MT) with guaranteed Quality of Service (QoS). The challenge is to maintain the playing continuity of multimedia streams during
handoff. In this paper, a bandwidth reservation scheme based on mobility prediction is proposed, to enable high accurate prediction
of next crossing cell (target cell) which a MT is going to, in order to avoid too early or over reservation resulting in a
waste of resources. The amount of bandwidth to be reserved is dynamically adjusted according to (a) the current position (location)
and the extrapolated direction of MT and; (b) the sector and zones of the cell. A Call Admission Control scheme (CAC) is also
considered to further guarantee the QoS of real time traffic. The performance of the system is evaluated through discrete
event simulation of the wireless cellular environment. Simulation results show that the proposed scheme as compared to several
existing schemes is able to reduce the Handoff Call Dropping Probability (HCDP) of real time traffic and the number of terminated
ongoing calls of non-real time traffic. In addition, it is efficient to reduce the number of cancelled reservation and subsequently
increase the system bandwidth utilization.
相似文献
Maher A. Al-SanabaniEmail: |