Neutrino Masses and Mixing, Quark-lepton Symmetry and Strong Right-handed Neutrino Hierarchy

Assuming the same form of all mass matrices as motivated by quark-lepton symmetry, we discuss conditions under which bi-large mixing in the lepton sector can be obtained with a minimal amount of fine tuning requirements for possible models. We assume hierarchical mass matrices, dominated by the 3-3 element, with off-diagonal elements much smaller than the larger neighboring diagonal element. Characteristic features of this scenario are strong hierarchy in masses of right-handed neutrinos, and comparable contributions of both lighter right-handed neutrinos to the resulting left-handed neutrino Majorana mass matrix. Due to obvious quark lepton symmetry, this approach can be embedded into grand unified theories. The mass of the lightest neutrino does not depend on details of a model in the leading order. The right-handed neutrino scale can be identified with the GUT scale in which case the mass of the lightest neutrino is given as (m_{top}^2/M_{GUT}) |U_{\tau 1}|^2.Comment: 7 page

Apparatus and Method for Measuring 3-D Weld Pool Shape

A method and apparatus are provided allowing the determination of 3-D weld pool surface geometry in the presence of a welding arc during a welding operation. The method includes the steps of illuminating the weld pool surface with diffused, structured light and detecting specular reflection of that diffused, structured light from the weld pool surface. An acquired image results. By analyzing the acquired image it is possible to determine the geometry of the weld pool surface. The apparatus for performing the method includes a high intensity light source, a diffuser and a structured light forming grid. A camera is provided for specular reflection detection of the light reflecting from the weld pool surface

Policijski aspekti forenzičkih metoda studije procenta sadržaja vode kod određivanja starosti fresaka

The novels of the Criminal Procedure Code (CPC) Republic of Serbia have introduced the concept of prosecutorial investigation in relation to that of evidence, special evidentiary actions and other software for the operation of the criminal prosecution. The meaning of novels is to conduct harmonization of standards with solutions of modern criminal law practice, particularly with regard to EU standards Serbia applying for membership in the Union. Preventing the most serious forms of crime is the focus of authorized bodies Serbia and in this context combating and preventing all forms of forgery, as is the case with forgeries frescoes and selling them on the world market. In exposed paper the method determining age of the frescoes is proposed. It is based on the use of closed Markov's graphs with three cells. The measurements of contents of water molecules in surrounding area can be done only for the space in which the frescoes is located. This means that followed exposed method is non destructive.Novele o krivičnom postupku (ZKP) Republike Srbije imaju uvodni koncept tužilačke istrage u vezi sa ovim dokazima, posebne dokazne radnje i drugi softver za funkcionisanje krivičnog gonjenja. Značenje novela je da sprovede usklađivanje standarda sa rešenjima savremenog krivičnog zakona u praksi, posebno u vezi sa standardima EU Srbije, koja se prijavljuje za članstvo u Uniji. Sprečavanje najozbiljnijih oblika kriminala je fokus nadležnih organa Srbije i u tom kontekstu je sprečavanje i borba protiv svih oblika falsifikata, kao što je slučaj sa falsifikatima fresaka i umetničkih slika i njihova prodaja na svetskom tržištu. U izloženom radu je predložen metod određivanja starosti fresaka. On se zasniva na korišćenju zatvorenih Markovljevih grafova sa tri ćelije. Merenja sadržaja molekula vode u okolini može se uraditi samo za prostor u kome se nalaze freske. To znači da je sledeći izloženi metod koji se koristi - nedestruktivan

Trapping of chiral enolates generated by Lewis acid promoted conjugate addition of Grignard reagents to unreactive Michael acceptors by various electrophiles

Here we show trapping of chiral enolates with carbenium ions, Michael acceptors, and bromine. Silyl ketene aminals, disilyl acetals, and aza-enolates were obtained via Lewis acid mediated enantioselective conjugate addition of Grignard reagents to unsaturated amides, carboxylic acids and alkenyl heterocycles

Phenotypic and molecular evaluation of genetic diversity of rapeseed (Brassica napus L.) genotypes

The genetic diversity and relationships among rapeseed genotypes were evaluated using quantitative analysis and random amplified polymorphic DNA (RAPD) markers. Ten morphological and biochemical traits (plant height, height to the first branch, stem diameter, branch number, leaf number, pod number, seed yield per plant, 1000-seed weight, oil content and protein content) were analyzed in a three-year field experiment with 30 winter rapeseed genotypes. RAPD analysis was performed with 13 primers,chosen according to previous results. Significant genetic variability among the genotypes was obtained at both the morphological and molecular level. Nine out of the thirteen RAPD primers that were used for the analysis enabled the estimation of DNA polymorphism of the genotypes, while the other primerswere monomorphic. Dendrograms obtained for morpho-biochemical traits and for the RAPD results were compared. In both cases partial grouping of genotypes based on their geographical origin was established

Primena Veberovih fokalno-direktrisnih ravanskih krivih u aproksimaciji konturne krive osnove arhitektonskih objekata

One of the major aims when researching some problems in architectural design of buildings is to fully understand and adequately apply the underlying scientific foundations that architects use in their projects. In this paper we analyze the application possibilities of the Weber's focal-directorial curves in the approximation of ground-base contour line of architectural objects i.e. buildings. Thus, a Weber's curve with m foci and n directrices was defined. Furthermore, particular qualifiers were introduced in order to estimate the level of adequacy of the conducted approximation. The importance of the research can be sought in the fact that the exact procedure has been created with its applicability in architectural-urban design of contemporary forms as well as in the domain of the historical heritage and conservation in the sense of the creating proper geometrical models for further computer aided use.Jedan od glavnih ciljeva istraživanja nekih problema u arhitektonskom dizajniranju zgrada je potpuno razumevanje i adekvatno primenjivanje naučnih načela koje arhitekte koriste u svojim projektima. U ovom radu analiziramo mogu nosti primene eberovih fokalno-direktrisnih krivih u aproksimaciji konture osnove arhitektonskih objekata, tj. zgrada. U vezi sa tim, definisana je Veberova kriva sa m fokusa i n direktrisa. Osim toga, uvedeni su posebni kvalifikatori kako bi se procenio nivo preciznosti izvršene aproksimacije. ažnost istraživanja se posebno iskazuje u činjenici da je postupak kreiran sa mogu noš u primene u arhitektonsko-urbanističkom dizajniranju savremenih oblika, kao i u domenu zaštite i revitalizacije istorijskog nasle a u smislu stvaranja odgovaraju ih geometrijskih modela za dalju upotrebu pomo u računara

Crystal structure solution of an elusive polymorph of Dibenzylsquaramide

The crystal structure of the third polymorph of dibenzylsquaramide (Portell, A. et al., 2009), (fig. 1) has been determined from laboratory X-ray powder diffraction data by means of direct space methods using the computing program FOX. (Favre-Nicolin and Černý, 2002) The structure resolution has not been straightforward due to several difficulties on the indexing process and in the space group assignment. The asymmetric unit contains two different conformers, which has implied an additional difficulty during the Rietveld (Rietveld, 1969) refinement. All these issues together with particular structural features of disquaramides are discusse

Anisotropy of Thermal Conductivity and Possible Signature of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn_5

We have measured the thermal conductivity of the heavy-fermion superconductor CeCoIn_5 in the vicinity of the upper critical field, with the magnetic field perpendicular to the c axis. Thermal conductivity displays a discontinuous jump at the superconducting phase boundary below critical temperature T_0 ~ 1 K, indicating a change from a second to first order transition and confirming the recent results of specific heat measurements on CeCoIn_5. In addition, the thermal conductivity data as a function of field display a kink at a field H_k below the superconducting critical field, which closely coincides with the recently discovered anomaly in specific heat, tentatively identified with the appearance of the spatially inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state. Our results indicate that the thermal conductivity is enhanced within the FFLO state, and call for further theoretical investigations of the order parameter's real space structure (and, in particular, the structure of vortices) and of the thermal transport within the inhomogeneous FFLO state.Comment: 19 pages, 6 figures, submitted to Prhys. Rev.

Structural Investigations of Polyvinyliden Fluoride Thin and Thick Films

Polyvinyliden fluoride (PVDF) is a low-density fluoropolymer that exhibits piezoelectric and pyroelectric properties. It can be used in the chemical, semiconductor, medical and defense industries, as well as in aviation and aerospace applications. Crucial factors that lead to the PVDF ferroelectric properties and determine its piezoelectric, mechanical, optical, electrical and thermal properties are its polar conformations, crystal structure, and crystallinity. These characteristics of the material significantly depend on the conditions used in the processing of polymer films. Therefore, we investigated structure and morphology of thin and thick PVDF films obtained by spin coating and solution casting methods, respectively. Structural investigations of PVDF thin and thick films were performed by the X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Fourier transform infrared spectrometry (FTIR) methods, while microstructure morphology has been analyzed by scanning electron microscope (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). Present results will enable optimization of PVDF processing techniques for the production of pressure and IR sensors