The rate difference between the weak decays of t and in supersymmetry

We find that the CP-violating asymmetry

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at the one-loop order within the minimal supersymmetric extension of the standard model is of the order of few percent for maximal CP violation. It could be measured by considering the rate difference in the one-lepton events.     

DPPH as a primary standard for quantitative EPR spectrometry

The present studies are concerned with the influence of the nature of the solvent on the time-dependent stability of the absorption maxima of the free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) at 520 nm as well as the intensity of its EPR spectrum. The correlation between these two characteristics of DPPH, the behaviour of which is found to be unpredictably strange, unambiguously shows that the problem for calibration of DPPH in order to be used as a primary standard for quantitative EPR spectrometry purpose is not solved yet. This problem needs additional studies in order to find exact methods for examination of the data concerning DPPH quantitative characteristics before its use.     

A new membrane electrode system with iodide-selective properties

The strongly basic anion-exchange resin Dowex 2 when saturated with triiodide and placed in a gel layer in a glass tube acts as an electrode for iodine, as does a platinum wire electrode. When the gel membrane is placed with a platinum electrode in an iodide solution, the anion-exchange resin adsorbs iodide selectively, and a decrease in the potential of the membrane electrode is caused. The arrangement can be used as an iodide-selective electrode, which shows a linear response over the pI^-range 1–5 and an excellent selectivity for iodide over other halides.     

A highly selective and sensitive method for identification of gold

Summary A highly sensitive method for detection of gold, almost free from interferences, is described. The reaction is performed on a short column of anion-exchange resin Dowex 1 X8 (100–200 mesh) in iodide form. To the test solution containing 0.13g/ml of gold(III) is added Sb-solution (weight ratio Au: Sb=1 200) and the mixture is then passed through the resin, followed by 1N NaOH. A crimson colour appearing within 2–3 min indicate gold. Many metal ions, including Pt-metals, Tl(I), Tl(III), Ir(IV), In (III), Ga(III), Cu(II), Cd(II), Zn(II), Pb(II), Fe(III), Mn(II), Co(II), Ni(II), Hg(II), As(III) do not interfere. In the presence of 50-fold excess of Ag(I) or Bi(III) there is no colour because of the formation of a precipitate on the resin.

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Zusammenfassung Ein hochempfindliches und selektives Verfahren zum qualitativen Gold-nachweis wurde vorgeschlagen. Die Reaktion wird in einer 10 mm hohen Anionenaustauschersäule Dowex 1 X8 in Jodidform durchgeführt. Zu der aufgetragenen Probelösung fügt man Sb(III) und (V) (im Verhältnis Au: Sb= 1 200) und versetzt nachher auf der Säule mit 1-n NaOH. Nach einigen Minuten entsteht um die Harzkörner eine himbeerrote Färbung. Pt-Metalle, Tl(I), Tl(III), Ir(IV), In(III), Ga(III), Cu(II), Cd(II), Zn(II), Pb(II), Fe(III), Mn(II), Co(II), Ni(II), Hg(II), As(III) stören nicht; Ag(I) und Bi(III) stören gleichfalls nicht, solange sie in nicht mehr als 50facher Menge neben Gold vorliegen. Bei höheren Konzentrationen setzen sie sich als unlösliche Jodide um die Harzkörner ab und stören. Die Nachweisgrenze der Reaktion liegt bei 0,13g/ml.

     

Morphology of Polyethylene Foamed Crosslinked Specimens made by Hot Mold Injection Molding

Abstract

Foamed and crosslinked specimens of polyethylene made by hot mold injection molding were investigated. A combination of PELD, dicumilperoxide and azodicarbonamide was used. The three components were mixed and granulated in an extruder-granulator at temperature 100—120°C. The degree of crosslinking was calculated by equilibrium strain ?_r determined at temperature 140°C and pressure stress σ_p=0.045 MPa. The same parameter was evaluated by thermomechanical curves. The degree of crystal-linity was determined by DSC-kinetics of a nonisothermal melting and crystallization. The morphology was investigated by a polarized microscope MIN 8.

It is established that a part of polymer crystallizes as spherulites. The spherulites can observed with crossed polarizers. The samples on the whole are not oriented. There exists only a local orientation around the edge of the bubbles which is proved by the observed bright regions. The number of the spherulites decreases with the increase of crosslinking degree. This also conforms with the degree of crystallinity which decreases with the increase of the crosslinking degree.     

Morphology and Orientation of PP-Structural Foam Moldings

Abstract

An experimental study was conducted to investigate the interaction between the macrostructure and morphology of PP-structural foam moldings made by gas-counter pressure process by egression of foamed melt from the core of the molding. The structural foam moldings, center-gated cylindrical plate “disc” (diameter 1800 mm. high 11 mm) were produced on an in-line injection molding machine KuASY 800/250, varying the shot weight and melt temperature. The polymer used was isotactic polypropylene “Buplen” 7523 with 1 wt% chemical blowing agent (azodicarbonamide) added. The morphology, orientation, and processes of non isothermal phase transition have been studied using polarized optical microscopy, SALS, DSC and birefringence. Samples were cut from the discs at different distances from the gate. The presence of a two-layered structure was observed in the solid skin: an outer smectic layer and an inner particular crystalline layer. The thickness of the smectic layer and size of spherulites from skin to the foamed core were determined. The orientation in radical and tangential direction of the flow and perpendicular to the disc surface were studied in mold filling and egression stage. The fixed orientation in final moldings is a complex picture of bubble growth, bubble orientation and shear flow. It was found that the radical orientation decreases with the distance from the gate. Maximum orientation is located in the solid skin, and minimum in the foamed core, and was shown by means of a birefringence profile.     

In Vitro Antineoplastic and Antiviral Activity and In Vivo Toxicity of Geum urbanum L. Extracts

This study evaluated the in vitro antineoplastic and antiviral potential and in vivo toxicity of twelve extracts with different polarity obtained from the herbaceous perennial plant Geum urbanum L. (Rosaceae). In vitro cytotoxicity was determined by ISO 10993-5/2009 on bladder cancer, (T-24 and BC-3C), liver carcinoma (HEP-G2) and normal embryonic kidney (HEK-293) cell lines. The antineoplastic activity was elucidated through assays of cell clonogenicity, apoptosis induction, nuclear factor kappa B p65 (NFκB p65) activation and total glutathione levels. Neutral red uptake study was applied for antiviral activity. The most promising G. urbanum extract was analyzed by UHPLC–HRMS. The acute in vivo toxicity analysis was carried out following OEDC 423. The ethyl acetate extract of aerial parts (EtOAc-AP) exhibited the strongest antineoplastic activity on bladder cancer cell lines (IC₅₀ = 21.33–25.28 µg/mL) by inducing apoptosis and inhibiting NFκB p65 and cell clonogenicity. EtOAc and n-butanol extracts showed moderate antiviral activity against human adenovirus type 5 and human simplex virus type I. Seventy four secondary metabolites (gallic and ellagic acid derivatives, phenolic acids, flavonoids, etc.) were identified in EtOAc-AP by UHPLC–HRMS. This extract induced no signs of acute toxicity in liver and kidney specimens of H-albino mice in doses up to 210 mg/kg. In conclusion, our study contributes substantially to the detailed pharmacological characterization of G. urbanum, thus helping the development of health-promoting phytopreparations.     

On the lowest order electroweak corrections to spin-12 fermion scattering: (I). The one-loop diagrammar

Based on a gauge model of the electroweak interaction the total set of all one-loop diagrams for scattering of $\text{spin}\text{-}\text{1}\text{2}$ fermions is calculated. Throughout the calculations, the type of fermions (?, ν, …) and of heavy vector bosons (W^±Z⁰, …) is not specified. Derivation of finite parts of each diagram is carried out under the restriction that all invariants of the amplitude are much larger than all fermion masses squared. This allows us to use the expression obtained at arbitrary high energies where weak and electromagnetic interaction strengths are comparable.     

On kaon production in e<Superscript>+</Superscript>e<Superscript>-</Superscript> and semi-inclusive DIS reactions

We consider semi-inclusive unpolarized DIS for the production of charged kaons and the different possibilities to test the conventionally used assumptions s-s̄=0 and D_d ^K+-K-=0. The tests considered have the advantage that they do not require any knowledge of the fragmentation functions. We also show that measurements of both charged and neutral kaons would allow for the determination of the kaon fragmentation functions D_q ^K++K- solely from SIDIS measurements, and we discuss the comparison of (D_u-D_d)^K+-K- obtained independently in SIDIS and e⁺e^- reactions. All analyses are performed in LO and NLO in QCD. The feasibility of the tests to HERMES SIDIS data is considered. PACS 12.38.Bx; 13.85.Ni     

Atomic parity-violation and precision physics

The atomic parity-violation (APV) parameter for a nucleus with n neutrons and z protons has been included in the list of pseudo-observables accessible with the codes TOPAZ0 and ZFITTER. In this way one can add the APV results in the LEP EWWG “global” electroweak fits, checking the corresponding effect when added to the existing precision measurements. Received: 8 March 2001 / Published online: 21 September 2001