Time filter

Source Type

Zhang H.-F.,Military School of Engineering | Sun Z.,Chongqing University | Sang W.-L.,Southwest University | Sang W.-L.,CAS Institute of Theoretical Physics | Li R.,Xian Jiaotong University
Physical Review Letters | Year: 2015

With the recent LHCb data on ηc production and based on heavy quark spin symmetry, we obtain the long-distance matrix elements for both ηc and J/ψ productions, among which, the color-singlet one for ηc is obtained directly by the fit of experiment for the first time. Using our long-distance matrix elements, we can provide good description of the ηc and J/ψ hadroproduction measurements. Our predictions on J/ψ polarization are in good agreement with the LHCb data, explain most of the CMS data, and pass through the two sets of CDF measurements in the medium pt region. Considering all the possible uncertainties carefully, we obtained quite narrow bands of the J/ψ polarization curves. © 2015 American Physical Society.

Zhu J.,Chongqing Medical University | Huang H.,Chongqing Medical University | Dong S.,Military School of Engineering | Ge L.,Harvard University | And 2 more authors.
Theranostics | Year: 2014

Aptamers are novel oligonucleotides with flexible three-dimensional configurations that recognize and bind to their cognate targets, including tumor surface receptors, in a high-affinity and highly specific manner. Because of their unique intrinsic properties, a variety of aptamer-mediated nanovehicles have been developed to directionally transport anti-cancer drugs to tumor sites to minimize systemic cytotoxicity and to enhance permeation by these tumoricidal agents. Despite advances in the selection and synthesis of aptamers and in the conjugation and self-assembly of nanotechnologies, current chemotherapy and drug delivery systems face great challenges. These challenges are due to the limitations of aptamers and vehicles and because of complicated tumor mechanisms, including heterogeneity, anti-cancer drug resistance, and hypoxia-induced aberrances. In this review, we will summarize current approaches utilizing tumor surface hallmarks and aptamers and their roles and mechanisms in therapeutic nanovehicles targeting tumors. Delivery forms include nanoparticles, nanotubes, nanogels, aptamer-drug conjugates, and novel molecular trains. Moreover, the obstacles posed by the aforementioned issues will be highlighted, and possible solutions will be acknowledged. Furthermore, future perspectives will be presented, including cutting-edge integration with RNA interference nanotechnology and personalized chemotherapy, which will facilitate innovative approaches to aptamer-based therapeutics.© Ivyspring International Publisher.

Cui C.-Y.,Military School of Engineering | Liu Y.-L.,National University of Defense Technology | Huang M.-Q.,National University of Defense Technology
European Physical Journal C | Year: 2013

We investigate whether the newly observed narrow resonance Zc(4025) can be described as a D*D̄* molecular state with quantum numbers JP=1+. Using QCD sum rules, we consider contributions up to dimension six in the operator product expansion and work at leading order of αs. The mass obtained for this state is (4.05±0.28) GeV. It is concluded that the D*D̄* molecular state is a possible candidate for Zc(4025). © 2013 Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica.

Liu Y.-L.,National University of Defense Technology | Cui C.-Y.,Military School of Engineering | Huang M.-Q.,National University of Defense Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

The light-cone distribution amplitudes (LCDAs) of the Σ± baryons up to twist-6 are investigated on the basis of the QCD conformal partial wave expansion approach. The calculations are carried out to the next-to-leading order of conformal spin accuracy. The nonperturbative parameters relevant to the LCDAs are determined in the framework of the QCD sum rule method. The explicit expressions of the LCDAs are given as the main results. © 2014 American Physical Society.

Elbasuney S.,Military School of Engineering
Powder Technology | Year: 2014

There are well known problems with the dispersion of inorganic nanoadditives into organic medium as they tend to aggregate and agglomerate, therefore the particles act like micron sized particles rather than nanoparticle scale. In this paper, we investigated the differences between dispersing dry and colloidal TiO2 nanoparticles into epoxy resin. The dry TiO2 was commercially obtained P25 and freeze dried TiO2 from continuous hydrothermal synthesis (CHS). The colloidal TiO2 was produced from CHS but without a drying stage. Specific parameters including loading level (1-30wt.%), mechanical mixing (2-60min), polymer heating (25-80°C), and dry and wet addition were investigated. The nanoparticle dispersion was investigated with SEM and quantified by using Labview image analysis (National Instruments), in order to quantify the characteristic aggregate dimensions such as perimeter, maximum feret diameter, and size. TiO2 nanoparticles were formulated and surface modified with dodecenyl succinic anhydride (DDSA) by using CHS technique. Online phase transfer was used to produce colloidal DDSA-titania dispersed in toluene which could then be directly integrated into epoxy resin. This approach showed enhanced nanoparticle dispersion (nanoscale dispersion) with minimum aggregation compared with the dispersion of dry nanoparticles. Furthermore, this approach enabled the elimination of nanoparticle freeze drying and the redispersion of aggregated dry nanoparticles into polymeric matrix. © 2014 Elsevier B.V.

Discover hidden collaborations