Hadron Form Factors with the Boost-Corrected Wave Functions

Physics of Atomic Nuclei - Hadron form factors are calculated using the Lorentz-contracted wave functions, determined in the arbitrary dynamical scheme with the instantaneous interaction. It is...     

A-integrability of sums of trigonometric series

We investigate sine and cosine series such that their coefficients tend to zero and some subsequences of the coefficients have bounded variation.     

Convergent shock wave in an ideal elastic nonhomogeneous medium

The boundary-value problem for symmetric focusing of a shock wave in a medium with variable density under a constant load (model of a porous body with variable initial velocity) is solved. The solution asymptotic is studied. Focusing in a homogeneous medium has been previously studied [1], One inverse problem related to the choice of the optimal pressure conditions is examined. Constraints on the applicability of the model are touched on.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 1, pp. 107–111, January–February, 1976.     

Uv Dye Lasers

The moat important property of visible dye lasere, that is continuous wave length tuning, stimulated the search for dyes capable to lase UV. And they were founed in 1668¹. Now the need In tunable UV laeers for applications in spectroacopy, photochemistry, isotope separation, remote air and sea probing, etc. ie only more clearly Been. The object of thie paper is to review shortly some recent advances In UV dye lasers.     

Supramolecular structure organization and the biological properties of [Co(DH)<Subscript>2</Subscript>(PP)<Subscript>2</Subscript>][BF<Subscript>4</Subscript>]

The coordination compound [Co(DH)₂(PP)₂][BF₄]₂ · 2H₂O (DH⁻ is the dimethylglyoxime residue, PP is nicotinamide) was synthesized and studied by X-ray diffraction. The equatorial plane of the octahedral Co(III) complex contains two DH⁻ residues combined by intramolecular hydrogen bonds O-H…O, while the apical positions are occupied by two PP molecules. A method for the optimal use of the complex for enhancement of the biosynthesis of standard and acid-stable amylases of the micromycete Aspergillus niger 33–19 CNMN FD 02A and lipases of the micromycete Rhizopus arrhizus Fischer CNMN FD 03L was depeloped. The introduction of the complex in a concentration of 1–5 mg/l into the culture medium of Aspergillus niger 33-19 CNMN FD 02A reduces the process cycle by 24 h. The stimulating effect of the introduction of the complex (5 mg/l) into the culture medium of the Rhizopus arrhizus Fischer CNMN FD 03L strain is 55.5%.     

Laboratory of N.V. Belov as a school of highly qualified experts

The occasion of Nikolai Vasil’evich Belov’s 120th birthday is a good reason for recalling the works of this prominent representative of the pleiad of famous Russian and foreign crystallographers. Not only experts in structural crystallography passed through his school. The number of postgraduates that became candidates of sciences (and some, later, doctors) under the guidance of Belov is amazing. Many of his students organized and headed new laboratories at the Institute of Crystallography and at other institutes. We all remember the original methods proposed by Belov for determining the atomic structure of crystals in periods before and after the time when computers arose. New directions in the study of minerals and the solution of structural problems of crystal chemistry, crystal physics, and materials science continue in the community of crystallographers. They are being actively developed, and not only by Belov’s students.     

Nonperturbative parton distributions and the proton spin problem

The Lorentz contracted form of the static wave functions is used to calculate the valence parton distributions for mesons and baryons, boosting the rest frame solutions of the path integral Hamiltonian. It is argued that nonperturbative parton densities are due to excitedmultigluon baryon states. A simplemodel is proposed for these states ensuring realistic behavior of valence and sea quarks and gluon parton densities at Q² = 10 (GeV/c)². Applying the same model to the proton spin problem one obtains Σ₃ = 0.18 for the same Q².     

On choosing a reference redox system for electrochemical measurements: a cautionary tale

The potential of a quasi-reference electrode can be determined by introducing an internal reference redox system (IRRS) which comprises either the oxidizable or reducible form of a reversible (and, ideally, outer-sphere) redox couple and then observing the cyclic voltammetric responses. The objective is to choose the IRRS so that the cyclic voltammetric response for the simultaneously present electroactive analyte system (ANS) can be observed independently of the IRRS response. We identify three fundamental paradigms describing the relative positioning of the IRRS and ANS on the potential scale, the operative redox components for the IRRS and ANS, and the starting potential (E _start), reversing potential (E _rev), and ending potential (E _end) for the cyclic voltammetric scan as follows: paradigm A, an optimal paradigm which can produce completely independent cyclic voltammetric responses for the IRRS or for ANS; paradigm B, a less-than-optimal paradigm which can produce an independent cyclic voltammetry (CV) response for the ANS or a mixed response for the IRRS with that response on top of the ANS response; paradigm C, a problematic paradigm that can produce an independent CV response for the IRRS or a mixed response for the ANS with that response on top of the IRRS response; and any mixed response produces a thermodynamically favored redox cross-reaction which couples the IRRS and ANS systems and which can complicate the analysis of the ANS and IRRS responses. The conclusion is that paradigm C is to be avoided.