Beijing Normal University , colloqiually known as 北师大 or Beishida, is a public research university located in Beijing with strong emphasis on basic disciplines of humanities and science. It is one of the oldest and most prestigious universities in China.A normal school referred to an institution that aimed to train school teachers in the early twentieth century, and this terminology is preserved in the official names of such institutions in China. Wikipedia.
Deng F.-G.,Beijing Normal University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012
We propose an optimal nonlocal entanglement concentration protocol (ECP) for multiphoton systems in a partially entangled pure state, resorting to the projection measurement on an additional photon. One party in quantum communication first performs a parity-check measurement on her photon in an N-photon system and an additional photon, and then she projects the additional photon into an orthogonal Hilbert space for dividing the original N-photon systems into two groups. In the first group, the N parties will obtain a subset of N-photon systems in a maximally entangled state. In the second group, they will obtain some less-entangled N-photon systems which are the resource for the entanglement concentration in the next round. By iterating the entanglement concentration process several times, the present ECP has the maximal success probability, which is just equivalent to the entanglement of the partially entangled state. That is, this ECP is an optimal one. © 2012 American Physical Society.
Cui M.,Beijing Normal University
Current Medicinal Chemistry | Year: 2014
The deposition of β-amyloid (Aβ) plaques in the parenchymal and cortical brain is accepted as the main pathological hallmark of Alzheimer's disease (AD). According to the amyloid cascade hypothesis, the Aβ deposition in the brain appears to be a good diagnostic biomarker for AD and may also be a good predictive biomarker of this disease. Molecular imaging of Aβ plaques in the brain with positron emission tomography (PET), single photon emission computed tomography (SPECT) or molecular optical imaging represents a promising approach to the early diagnosis of AD and monitoring the effectiveness of novel therapies for this devastating disease. Our review focuses on the past and recent knowledge in this field with respect to small organic molecules that have been utilized for the development of Aβ imaging probes. © 2014 Bentham Science Publishers.
Gong B.,State University of New York at Buffalo |
Gong B.,Beijing Normal University
Accounts of Chemical Research | Year: 2012
Through specific molecular shapes and repeating polymeric sequences, biomacromolecules encode information about both structure and function. Inspired by DNA molecules, we have conceived a strategy to encode linear molecular strands with sequences that specify intermolecular association, and we and our collaborators have supported this idea through our experimental work. This Account summarizes the design and development of a class of molecular duplexes with programmable hydrogen-bonding sequences and adjustable stabilities.The specific system involves oligoamide strands synthesized from readily available monomeric modules based on standard amide (peptide) chemistry. By covalently linking three types of basic building blocks in different orders, we create oligoamide strands with various arrangements of amide O and H atoms that provide arrays of hydrogen bonding sequences. Because one of the two edges of these molecules presents the sequences of hydrogen-bond donors and acceptors, these oligoamide strands associate via their hydrogen-bonding edges into double-stranded pairs or duplexes. Systematic studies have demonstrated the strict sequence specificity and tunable stability of this system. These structurally simple duplexes exhibit many features associated with DNA sequences such as programmable sequence specificity, shape and hydrogen-bonding complementarity, and cooperativity of multipoint interactions.Capable of specifying intermolecular associations, these duplexes have formed supramolecular structures such as β-sheets and non-covalent block copolymers and have templated chemical reactions. The incorporation of dynamic covalent interactions into these H-bonded duplexes has created association units that undergo sequence-specific association and covalent ligation in both nonpolar solvents and polar media including water. These new association units may facilitate the development of new dynamic covalent structures, and new properties are emerging from these structures. For example, we discovered hydrogen-bonded duplexes that could gelate different organic solvents, and we could tune the gelatinization by adjusting the multiple side chains attached to the duplexes. In addition, we have recently designed duplexes whose formation and dissociation are controlled by changes in external stimuli such as acidity.With their programmable specificity and tunable stability, these molecular duplexes have provided a systematic approach for the association of different structural units. Further development of this system could facilitate the creation of many supramolecular and dynamic covalent structures. Because these duplexes are easily modifiable and information is easily encoded and retrieved, this system may address some of the remaining challenges facing information-storing molecules including self-replication. © 2012 American Chemical Society.
Wang K.,Beijing Normal University |
Dickinson R.E.,University of Texas at Austin
Reviews of Geophysics | Year: 2012
This review surveys the basic theories, observational methods, satellite algorithms, and land surface models for terrestrial evapotranspiration, E (or E, i.e., latent heat flux), including a long-term variability and trends perspective. The basic theories used to estimate E are the Monin-Obukhov similarity theory (MOST), the Bowen ratio method, and the Penman-Monteith equation. The latter two theoretical expressions combine MOST with surface energy balance. Estimates of E can differ substantially between these three approaches because of their use of different input data. Surface and satellite-based measurement systems can provide accurate estimates of diurnal, daily, and annual variability of E. But their estimation of longer time variability is largely not established. A reasonable estimate of E as a global mean can be obtained from a surface water budget method, but its regional distribution is still rather uncertain. Current land surface models provide widely different ratios of the transpiration by vegetation to total E. This source of uncertainty therefore limits the capability of models to provide the sensitivities of E to precipitation deficits and land cover change. © 2012 by the American Geophysical Union.
Patel D.J.,Sloan Kettering Cancer Center |
Wang Z.,Sloan Kettering Cancer Center |
Wang Z.,Beijing Normal University
Annual Review of Biochemistry | Year: 2013
This review focuses on a structure-based analysis of histone posttranslational modification (PTM) readout, where the PTMs serve as docking sites for reader modules as part of larger complexes displaying chromatin modifier and remodeling activities, with the capacity to alter chromatin architecture and templated processes. Individual topics addressed include the diversity of reader-binding pocket architectures and common principles underlying readout of methyl-lysine and methyl-arginine marks, their unmodified counterparts, as well as acetyl-lysine and phosphoserine marks. The review also discusses the impact of multivalent readout of combinations of PTMs localized at specific genomic sites by linked binding modules on processes ranging from gene transcription to repair. Additional topics include cross talk between histone PTMs, histone mimics, epigenetic-based diseases, and drug-based therapeutic intervention. The review ends by highlighting new initiatives and advances, as well as future challenges, toward the promise of enhancing our structural and mechanistic understanding of the readout of histone PTMs at the nucleosomal level. © 2013 by Annual Reviews. All rights reserved.
Wu J.-P.,Beijing Normal University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011
We study the properties of the Green's functions of the fermions in the extremal charged dilatonic black hole proposed by Gubser and Rocha. We find that many properties seem to be in agreement with that of Fermi liquid. Especially, the dispersion relation is linear. It is very different from that found in the extremal Reissner-Nordström (RN) black hole for massless fermion, which is obviously non-Fermi liquid due to a nonlinear dispersion relation. However, for another scaling behavior of the height of ImG11 at the maximum, the scaling exponent is not one, which is at odds with that found in the RN black hole. © 2011 American Physical Society.
Du J.,Beijing Normal University
Geophysical Research Letters | Year: 2012
Knowledge of the spatial distribution and temporal changes of the global soil moisture for a long period of time is crucial to the understanding of climate changes and hydrological processes. By applying Fourier analysis to the time-series observations from the space-borne passive microwave sensors, this paper proposes a method to extract the high-frequency part of the satellite observed signals that reflect the soil moisture changes and help to generate the historical soil moisture datasets with an improved accuracy. The method is applied to the observations from Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E). Validations using field sampled soil moisture from two watersheds in the U.S. indicate that the method can effectively improve the sensitivity of current National Aeronautics and Space Administration (NASA) soil moisture products to the temporal changes of the surface soil moisture, with the correlation coefficients of the retrievals and measurements increased from 0.462 to 0.595 and 0.403 to 0.613 for the two watersheds, respectively. © 2012. American Geophysical Union. All Rights Reserved.
Peng K.-Q.,Beijing Normal University |
Lee S.-T.,City University of Hong Kong
Advanced Materials | Year: 2011
Semiconductor nanowires are attracting intense interest as a promising material for solar energy conversion for the new-generation photovoltaic (PV) technology. In particular, silicon nanowires (SiNWs) are under active investigation for PV applications because they offer novel approaches for solar-to-electric energy conversion leading to high-efficiency devices via simple manufacturing. This article reviews the recent developments in the utilization of SiNWs for PV applications, the relationship between SiNW-based PV device structure and performance, and the challenges to obtaining high-performance cost-effective solar cells. Silicon nanowires (SiNWs) are attracting intense interest as a promising material for solar energy conversion for the new-generation photovoltaic (PV) technology. This article reviews recent developments in the utilization of SiNWs for PV applications, the relationship between SiNW-based PV device structure and performance, and the challenges to obtaining high-performance cost-effective solar cells. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Deng F.-G.,Beijing Normal University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011
We present two economical one-step error-correction protocols for multipartite polarization-entangled systems in a Greenberger-Horne-Zeilinger state. One uses spatial entanglement to correct errors in the polarization entanglement of an N-photon system, resorting to linear optical elements. The other uses frequency entanglement to correct errors in the polarization entanglement of an N-photon system. The parties in quantum communication can obtain a maximally entangled state from each N-photon system transmitted with one step in these two protocols, and both of their success probabilities are 100%, in principle. That is, they both work in a deterministic way, and they do not largely consume the less-entangled photon systems, which is far different from conventional multipartite entanglement purification schemes. These features may make these two protocols more useful for practical applications in long-distance quantum communication. © 2011 American Physical Society.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SSH.2013.3.1-1 | Award Amount: 3.17M | Year: 2014
The phenomena surrounding temporary transnational mobility of people are giving rise to an increasing political and academic debate throughout the world. This multidisciplinary EURA-NET project produces scientifically sound and innovative framings for investigating transformative characteristics and development impacts of temporary transnational migration and mobility in highly industrialised societies, transformation countries (emerging economies, transition countries, e.g.) and developing countries. Theoretical and empirical studies will be accomplished to attain an understanding of the transformative characteristics of temporary and circular migration, e.g. the mobility of seasonal workers, students, tourists and corporate workers in China, Finland, Germany, Hungary, India, the Netherlands, the Philippines, Thailand, Turkey and Ukraine, as well as in wider international and regional contexts. Research data will be gathered through interviews with individual migrants (and non-migrants) and national and international policy-makers. The findings in the European-Asian context will provide insights to be applied to other world regions. The final aim is to promote migration governance in a development perspective at all levels, from national to international. An associated set of questions concerns what challenges temporary transnational mobility poses to policy-making on European, national, international and global scales. By uncovering how politics structure peoples border-crossing movements in migrant-sending, migrant-receiving and transit countries and by shedding light on the international practices and lived experiences of individual migrants, the project will help European policy-makers to address challenges arising in the increasingly interconnected and demographically mobile world. The research outcomes will be communicated in the forms of policy briefs and scientific and policy reports to multi-level interest groups in European governance.