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排序方式: 共有61条查询结果,搜索用时 62 毫秒
21.
Hans-Richard Sliwka 《Chemie in Unserer Zeit》1997,31(1):32-35
The German-speaking countries decided last year to reform their spelling in an extremely restrictive manner, resulting in nearly invisible changes in daily writing. German chemists have actively promoted new orthography rules. R. Pauli, in 1904, edited a journal with a progressive writing, far ahead of the recently adopted new spelling rules. 相似文献
22.
M. Warns H. Schröder W. Pfeil H. Rollnik 《Zeitschrift fur Physik C Particles and Fields》1990,45(4):627-644
In this paper, we present numerical results for electroproduction amplitudes of proton resonances and electromagnetic nucleon form factors calculated in a relativized quark model. Interactions with both transversely and longitudinally polarized virtual photons were considered. Contributions of the different effects included in our approach have been analysed through a sample comparison with the available data. We also discuss the validity of the usual single-quark transition ansatz and possible parametrizations of the potential acting between the constituent quarks of the baryon. Impressive agreement is obtained with the nucleon form factor data up to squared momentum transfers of 2.5 GeV2, but still some problems remain with the Δ(1232) and higher resonances. 相似文献
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In this paper we consider the effect of unitarity bounds sbs(E1+E2)
cms
2
for the recently proposed types of nonderivative 4-fermion contact interactions. To this purpose we decompose the helicity amplitudes at c.m.s. into partial waves. The bounds are defined to hold for all reaction channels due to the same type of contact interaction. We find sb=4/. Here is the coupling constant. The factor depends on the type of coupling and on the different cases to identify the fermions. It ranges from 1/3 to 4. 相似文献
25.
Popplewell LJ Abu-Dayya A Khana T Flinterman M Abdul Khalique N Raju L Øpstad CL Sliwka HR Partali V Dickson G Pungente MD 《Molecules (Basel, Switzerland)》2012,17(2):1138-1148
Duchenne Muscular Dystrophy (DMD) is a common, inherited, incurable, fatal muscle wasting disease caused by deletions that disrupt the reading frame of the DMD gene such that no functional dystrophin protein is produced. Antisense oligonucleotide (AO)-directed exon skipping restores the reading frame of the DMD gene, and truncated, yet functional dystrophin protein is expressed. The aim of this study was to assess the efficiency of two novel rigid, cationic carotenoid lipids, C30-20 and C20-20, in the delivery of a phosphorodiamidate morpholino (PMO) AO, specifically designed for the targeted skipping of exon 45 of DMD mRNA in normal human skeletal muscle primary cells (hSkMCs). The cationic carotenoid lipid/PMO-AO lipoplexes yielded significant exon 45 skipping relative to a known commercial lipid, 1,2-dimyristoyl-sn-glycero-3-ethylphosphocholine (EPC). 相似文献
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M. Warns H. Schröder W. Pfeil H. Rollnik 《Zeitschrift fur Physik C Particles and Fields》1990,45(4):613-626
In this paper we investigate the electromagnetic form factors of baryons and their resonances using the framework of a relativized constituent quark model. Beyond the usual single-quark transition ansatz, we incorporate relativistic corrections which are welldetermined by the intrinsic interaction and confinement forces between the quarks. Furthermore we separate off for the compound three-quark system the relativistic center-of-mass motion by an approximately Lorentz-invariant approach. In this way for the first time recoil effects could be explicity studied. Using the harmonic oscillator wavefunctions with the configuration mixing as derived in the Isgur-Karl model, after restoring gauge invariance our relativized interaction hamiltonian can be used to calculate the transversely and longitudinally polarized photon transition form factors of the baryons. 相似文献
29.
E. Pfeil H. L. Schläfer E. Gruner A. Kleinschmidt A. Sippel A. Küntzel H. Hartmann W. Schmitz H. Kroepelin Ph. Siedler J. Stauff 《Colloid and polymer science》1956,149(2-3):131-137
Ohne Zusammenfassung 相似文献
30.
The appearance of craters is discussed, which are observed at the surface of propellant solids after laser pulse heating.
The discussion is based on the three-dimensional heat flow equation and an infinitesimal short heat source. The experimental
crater dimensions are correlated with the laser pulseenergy and the pyrolysis temperature of the solids. 相似文献