排序方式: 共有14条查询结果,搜索用时 15 毫秒
1.
We consider a quark model based on QCD scale anomaly in which the quarks move in the field of an effective glueball field.
Hadrons correspond to solitonic bags of higher energy density in a nonperturbative sea of condensed gluons. We calculate the
static properties of nucleon in this model and find that the nucleon mass is far too large (2.4–4 GeV) and the proton charge
radius (0.37–0.54 fm) is low. The proton gyromagnetic ratio and gA/gv are in reasonable agreement with the experimental numbers. 相似文献
2.
3.
H. Deden F.J. Hasert W. Krenz D. Lanske J. Morfin M. Pohl K. Schultze L. Welch G. Bertrand-Coremans H. Mulkens J. Sacton W. Van Doninck H. Burmeister I. Danilchenko D. Haidt P. Jobin C. Matteuzzi P. Musset A.J. Segar 《Physics letters. [Part B]》1977,67(4):474-478
New results are presented of an analysis of pictures taken during an exposure of Gargamelle to the CERN ν beam in 1975. In addition to three νμ+N→μ?+e++V0+ hadrons events previously reported, an excess is found of events of the type νμ+N→μ?+e++ hadrons without V0. An analysis of strange particle production in charged current events suggests a possible violation of the ΔS=ΔQ rule. Interpreted in terms of charm production, the data permit an estimate of branching ratios and production rate of charmed particles. A limit is also placed on charmed particle production by neutral currents. 相似文献
4.
A. Berthon L. K. Rangan J. Vrana
I. Butterworth
P. J. Litchfield A. M. Segar J. R. SmithJ. Meyer
E. Pauli B. Tallini 《Nuclear Physics B》1970,20(3):476-492A formationstudy of the reaction K−p→Λπo at 13 c.m. energies between 1915 and 2168 MeV is presented. Experimental differential cross sections and polarizations are given as expansions of Legendre polynomials and associated Legendre polynomials respectively. Partial wave analysis confirms the
assignment of the Σ(2030) and the
assignment of the Σ(1915). The parameters of these resonances are determined. The possible existence of other resonances coupled to this channel is investigated. 相似文献
5.
6.
We consider aSU(3) quark soliton model based on chiral invariant quark-meson coupling. We find soliton solutions with nonzero strangeness
andB=1 in the model with nontrivial kaonic fields, for values of the coupling constant greater than the phenomenologically acceptable
number. Hence they do not correspond to known strange baryons. 相似文献
7.
Manisha Pandey Hira Choudhury Sahleni Kaur D/O Segar Singh Naveenya Chetty Annan Subrat Kumar Bhattamisra Bapi Gorain Mohd Cairul Iqbal Mohd Amin 《Molecules (Basel, Switzerland)》2021,26(9)
A single ulcerative colitis (UC) is a chronic inflammatory bowel disease (IBD) that causes inflammation of the colonic mucosa at the distal colon and rectum. The mainstay therapy involves anti-inflammatory immunosuppression based on the disease location and severity. The disadvantages of using systemic corticosteroids for UC treatment is the amplified risk of malignancies and infections. Therefore, topical treatments are safer as they have fewer systemic side effects due to less systemic exposure. In this context, pH sensitive and enzymatically triggered hydrogel of pectin (PC) and polyacrylamide (PAM) has been developed to facilitate colon-targeted delivery of budesonide (BUD) for the treatment of UC. The hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), swelling ratio, and drug release. FT-IR spectroscopy confirmed the grafting as well loading of BUD in hydrogel. XRD showed the amorphous nature of hydrogel and increment in crystallinity after drug loading. On the other hand, SEM showed that the hydrogels exhibited a highly porous morphology, which is suitable for drug loading and also demonstrated a pH-responsive swelling behaviour, with decreased swelling in acidic media. The in-vitro release of BUD from the hydrogel exhibited a sustained release behaviour with non-ficken diffusion mechanism. The model that fitted best for BUD released was the Higuchi kinetic model. It was concluded that enzyme/pH dual-sensitive hydrogels are an effective colon-targeted delivery system for UC. 相似文献
8.
Nonlinear effective Lagrangian models with a chiral symmetry have been used to describe strong interactions at low energy,
for a long time. The Skyrme model and the chiral quark-meson model are two such models, which have soliton solutions which
can be identified with the baryons. We describe the various kinds of soliton states in these nonlinear models and discuss
their physical significance and uses in this review. We also study these models from the view point of classical nonlinar
dynamical systems. We consider fluctuations around theB=1 soliton solutions of these models (B, being the baryon number) and solve the spherically symmetric, time-dependent systems. Numerical studies indicate that the
phase space around the Skyrme soliton solution exhibits spatio-temporal chaos. It is remarkable that topological solitons
signifying stability/order and spatio-temporal chaos coexist in this model. In contrast with this, the soliton of the quark-meson
model is stable even for large perturbations. 相似文献
9.
10.
D. A. Segar J. L. Gilio 《International journal of environmental analytical chemistry》2013,93(4):291-301
Abstract The development of an analytical technique generally applicable to the determination of Ag, Cd, Co, Cu, Fe, Mn, Ni, Pb, V, and Zn in all biological tissues is described. All of these elements may readily be determined in tissue samples of less than 0.5 g using flameless atom reservoir atomic absorption with a Perkin-Elmer heated graphite atomizer. Some of the operational characteristics of this atomizer system are discussed. The utility of the method is illustrated by analyses of selected marine biota and of NBS standard orchard leaves. 相似文献