Search results for "laws"
showing 10 items of 147 documents
Invariant rotational curves in Sitnikov's Problem
1993
The Sitnikov's Problem is a Restricted Three-Body Problem of Celestial Mechanics depending on a parameter, the eccentricity,e. The Hamiltonian,H(z, v, t, e), does not depend ont ife=0 and we have an integrable system; ife is small the KAM Theory proves the existence of invariant rotational curves, IRC. For larger eccentricities, we show that there exist two complementary sequences of intervals of values ofe that accumulate to the maximum admissible value of the eccentricity, 1, and such that, for one of the sequences IRC around a fixed point persist. Moreover, they shrink to the planez=0 ase tends to 1.
Enjeux fonciers et développement "durable" au Mali
2012
Making the land issue a total economic phenomenon and capital the driving force of development equates to giving free rein to the commodification of the land. Is it really necessary for Mali to sell off its agricultural land and its land resources to access development? For what development? Does development demand that family-run small farming operations and age-old, traditional land management methods be sacrificed? Ever since the country attained national sovereignty in 1960, Mali ‒ a poor country in sub-Saharan Africa ‒ has been seeking in vain to achieve rapid economic, social and industrial development by all the means available, with the exception of the deployment of an endogenous d…
Rashkova, T. The Robson cubics for matrix algebras with involution (Acta Univ. Apulensis Math. Inform.).
2008
Let R be the free associative algebra over a field K on $n^2$ generators $a_{ij}$ and let $R\langle x\rangle$ be the free associative $K$-algebra in one further indeterminate $x.$ Consider the set of polynomials in $R\langle x\rangle$ which are satisfied by the $n\times n$ matrix $\alpha=(a_{ij}).$ Such polynomials are called laws over $R$ of the matrix $\alpha.$ Robson in [Robson, J. C. Polynomials satisfied by matrices. J. Algebra 55 (1978), no. 2, 509--520; MR523471 (80j:15012)] proved that such laws are a ``consequence" of a finite set of laws and for $n=2$ he exhibited $4$ generators called Robson cubics. Here the author considers the special case when $\alpha$ is a symmetric or skew-s…
Notes on the Spanish Supreme Court Ruling That Considers Riders to Be Employees
2020
Spain is one of the countries with highest levels of judicialisation of the dispute over the classification of platform working. Dozens of rulings have been issued in recent years. Most have pointed out the labour relation of platform workers in the transport sector, although some have argued that they were truly self-employed. This contradiction in judicial doctrine has allowed / forced the Spanish Supreme Court to rule on the matter. This ruling of 25 September 2020 (rec. 4746/2019) was issued by the plenary session of the Supreme Court on social matters, the decision being adopted unanimously by all the magistrates. The ruling has its origins in the case of a delivery rider who filed an …
The Plea of Illegality
2014
The people have right to defending their interests in judicial proceedings. The legal means available to the parties in the lawsuit include the exceptions of illegality. These are means of defence and not exceptions to the procedure law or substantive law; as a result has a special legal regime. In administrative judicial procedure the exception of illegality may be invoked at any time, to any court. The court of justice competent to decide on exception is that which is invested with initial substantive dispute. It eliminates one of the causes of delays in judicial process.
Anomalous tracer diffusion in film forming colloidal dispersions
2000
Film forming colloidal dispersions can be conceived as a material composed of interpenetrating hydrophobic (polymer) and hydrophilic (partially broken interfaces) phases where the transport properties of one phase are influenced by the geometric confinement effect imposed by the other. We studied the transport properties of film forming colloidal dispersions by introducing hydrophobic dye molecules into the colloidal particles and determining their motion with forced Rayleigh Scattering as a function of length scale (grating distance A) and water content. At water contents between 18 and 3 weight percent we find signatures of anomalous tracer diffusion, namely stretched exponential decay cu…
Old Frisian skalk: A ‘Servant’ or a ‘Rogue’?
2017
The Old Frisian wordscalc, scalch, schalcis usually used in the sense of ‘servant, slave’. However, the word evidences a pejoration in meaning, being also attested in the Frisian written tradition in the sense of ‘ill-mannered person, villain, a bad guy’. The investigation of the occurrences ofskalk–along with a comparison of its Germanic cognates–will allow us to draw a picture of the semantic development of this word from medieval times to the Modern stage of the Frisian language. In the author’s opinion, the negative connotation ofskalkas an offensive epithet is the final result of a range of different causes, whose origin should be searched both in Frisian-Scandinavian contacts during t…
Study of Collisional Effects on Band Shapes of the ν1/2ν2 Fermi Dyad in CO2 Gas with Stimulated Raman-Spectroscopy .3. Modeling of Collisional Narrow…
1994
0021-9606; High resolution stimulated Raman spectra (SRS) of the ν1/2ν2 Fermi dyad of CO2 have been recorded in the 0.4-22. amagat density range at 700 K and in the 0.6-16 amagat density range at 900 K. The data have been successfully analyzed with a theoretical model taking into account both rotational line mixing through the energy corrected sudden-polynomial (ECS-P) law for the relaxation matrix and vibrational line broadening gamma(v) and line shifting delta(v). The two vibrational parameters have been accurately determined from fit to the experimental spectra. These new high temperature data together with previous data obtained at 295 and 500 K [B. Lavorel et al., J. Chem. Phys. 93, 21…
Statistical Analysis of Macroseismic Data for a better Evaluation of Earthquakes Attenuation Laws
2020
In this work we propose a statistical approach, based on the joint analysis of macroseismic data of Italian seismic events of the last two centuries, with which we obtain simultaneously maximum likelihood estimates of attenuation laws and coordinates of hypocenters. Our first results encourage us to use in the future more complex models, with a larger number of historical earthquakes.
Recommendations for design and analysis of health examination surveys under selective non-participation
2019
Background The decreasing participation rates and selective non-participation peril the representativeness of health examination surveys (HESs). Methods Finnish HESs conducted in 1972–2012 are used to demonstrate that survey participation rates can be enhanced with well-planned recruitment procedures and auxiliary information about survey non-participants can be used to reduce selection bias. Results Experiments incorporated to pilot surveys and experience from previously conducted surveys lead to practical improvements. For example, SMS reminders were taken as a routine procedure to the Finnish HESs after testing their effect on a pilot study and finding them as a cost-effective way to inc…