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Search Results: 1 - 10 of 149657 matches for " H. Kania "
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Impact of the density of the mould powder on thickness of the layer of liquid slag in the continuous caster mould
H. Kania,K. Nowacki,T. Lis
Metalurgija , 2013,
Abstract: The paper presents results of measurements of the thickness of liquid slag layer in concast mould for pulverized, granulated or formed mould powder. The thickest layer of liquid slag was obtained for formed powders.
The impact of the chemical composition of continuous casting moulds on their physical properties
T. Lis,H. Kania,K. Nowack
Journal of Achievements in Materials and Manufacturing Engineering , 2012,
Abstract: Purpose: The purpose of the research conducted was to determine the impact of a binder used in selected mould powders in continuous casting mould on the following physical properties: viscosity, alkalinity and the melting point. Additionally, non-fluoric casting powders were analyzed.Design/methodology/approach: The methodology of the research conducted was based on the chemical analysis of basic mould powders and powders with 5% addition of food origin binder.Findings: The findings indicate that the addition of the binder results in decreasing in viscosity in the cases studied.Research limitations/implications: The physical properties of mould powders have an impact on the quality of continuous ingot, therefore it is necessary to be acquainted when searching for the relationship between the quality of the casting and technological parameters of steel continuous casting process.Practical implications: The findings may be applicable in technological practice when changing standard mould powder for mould in the form other than a powdered one, in which food origin binders are used.Originality/value: Modified mould powders are an alternative for standard powdered mould, therefore it is desirable to conduct research on their properties in order to plan and manage steel continuous casting process in a proper way.
Structural parameters compared to piezoceramic power head efficiency used in sound amplification of liquid steel
K. Nowacki,T. Lis,H. Kania
Journal of Achievements in Materials and Manufacturing Engineering , 2012,
Abstract: Purpose: The main purpose of the study was to determine the efficiency of mechanoacoustic piezoceramic power head with resonance frequency of 26.4 kHz, used in acoustic processing of liquid steel. The efficiency was determined due to compressive force quantity of piezoelectrical ceramic, characterized by the moment turning circumferential screws of the head.Design/methodology/approach: The research was conducted on a water model. Efficiency was determined depending on the pressure force of active and passive part of the head, specified by torque moment within the range of 25-35 Nm and depending on the medium active power on the output of the generator within the range of 50-150 W. The mechanoacoustic efficiency was determined by calorimetrical method.Findings: The acquired findings indicate relations between the radiation power inflicted, the force turning circumferential screws and the mechanoacoustic efficiency of power head.Research limitations/implications: The results obtained shall be used while designing and operating power heads.Practical implications: It is necessary to consider the mechanoacoustic efficiency of the applied power head during sound amplification of liquid centers.Originality/value: Acoustic processing may be the last stage of steel ingot quality forming process, therefore it is necessary to learn all the parameters influencing its efficiency.
Formation of coatings from a liquid phase on the surface of iron-base alloys
P. Liberski,A. Gierek,H. Kania,P. Podolski
Archives of Foundry Engineering , 2008,
Abstract: The study discloses the present state of the art regarding the technology and investigations of the phenomena that take place during the formation and growth of aluminum and zinc coatings hot-dip formed on iron products. In its cognitive aspect, the study offers an in-depth analysis of the partial processes that proceed in metal bath at the solid body – liquid metal interface. It is expected that the present study will help in a more detailed description of the respective phenomena and in full explanation of the mechanism of the coating growth, taking as an example the growth of aluminum coatings. The obtained results can serve as a background for some general conclusions regarding the thickness evolution process in other hot-dip coatings.
Postoperatives Schmerztherapiemanagement nach urologischen Interventionen
Werner W,Kania S,Schubert J,Zermann D-H
Journal für Urologie und Urogyn?kologie , 1999,
Abstract: Schmerz, Schmerzbek mpfung und Pr vention in der postoperativen Phase werden vielfach untersch tzt. Eine Erhebung über die analgetische Therapie nach urologischen Eingriffen an deutschen Universit tskliniken zeigte, da 37 % der Patienten nach gro en operativen Eingriffen (Tumonephrektomie, radikale Prostatektomie, u.a.) und 15 % der Patienten nach mittelschweren Eingriffen durch An sthesisten - und nicht durch die Urologen selbst - therapiert werden. Dabei standen Opioide (80 %) im Vordergrund. Kleinere Eingriffe (Genitalchirurgie) werden ausschlie lich durch das eigene Fachgebiet, transurethrale sowie Operationen über einen Flankenschnitt werden zu 74 % durch Urologen therapiert. Auch hier sind die bevorzugten Medikamente Opioide und zus tzlich Nicht-Opioid-Analgetika. An 447 eigenen Patienten wurde die postoperative Schmerzsituation überprüft. Es erfolgte deshalb die standardisierte Befunderhebung mittels einer visuellen Analogskala (VAS), die eine Schmerzklassifikation von 0 bis 10 besitzt. 27,7 % der Patienten nach transurethralen Eingriffen geben starke Schmerzen (VAS 4) an. Gravierend und im Vordergrund stehen die Schmerzangaben (VAS 4) nach gro en Eingriffen: Patienten nach Tumornephrektomie geben in 92,7 %, nach radikaler Prostatektomie in 83,3 % und Patienten nach Flankenschnitt sowie Nierentransplantation geben immerhin in 70,8 % Schmerzen an, die einen tolerablen Bereich überschreiten. Die unterschiedlichen Handlungsweisen in Deutschland und die Erhebungen im eigenen Patientengut zeigen die teilweise unbefriedigende postoperative Schmerztherapie trotz vermeintlich ausreichender Gabe von Opiaten, Nicht-Opioid-Analgetika und den Einsatz der sogenannten patientenkontrollierten Analgesie (PCA). Die Optimierung der postoperativen Schmerztherapie ist deshalb von aktueller Dringlichkeit. Die pr sentierten Ergebnisse sind Grundlage für eine prospektive, randomisierte Studie, die im Januar 1998 in der Urologischen Universit tsklinik Jena begonnen wurde.
3-manifold invariants and periodicity of homology spheres
Patrick M. Gilmer,Joanna Kania-Bartoszynska,Jozef H. Przytycki
Mathematics , 1998, DOI: 10.2140/agt.2002.2.825
Abstract: We show how the periodicity of a homology sphere is reflected in the Reshetikhin-Turaev-Witten invariants of the manifold. These yield a criterion for the periodicity of a homology sphere.
Concocting Cholinergy
Artur Kania
PLOS Genetics , 2014, DOI: doi/10.1371/journal.pgen.1004313
Abstract:
A reflexive Banach space whose algebra of operators is not a Grothendieck space
Tomasz Kania
Mathematics , 2012, DOI: 10.1016/j.jmaa.2012.12.017
Abstract: By a result of Johnson, the Banach space $F=(\bigoplus_{n=1}^\infty \ell_1^n)_{\ell_\infty}$ contains a complemented copy of $\ell_1$. We identify $F$ with a complemented subspace of the space of (bounded, linear) operators on the reflexive space $(\bigoplus_{n=1}^\infty \ell_1^n)_{\ell_p}$ ($p\in (1,\infty))$, thus giving a negative answer to the problem posed in the monograph of Diestel and Uhl which asks whether the space of operators on a reflexive Banach space is Grothendieck.
On C*-algebras which cannot be decomposed into tensor products with both factors infinite-dimensional
Tomasz Kania
Mathematics , 2014,
Abstract: We prove that C*-algebras which, as Banach spaces, are Grothendieck cannot be decomposed into a tensor product of two infinite-dimensional C*-algebras. By a result of Pfitzner, this class contains all von Neumann algebras and their norm-quotients. We thus complement a recent result of Ghasemi who established a similar conclusion for the class of SAW*-algebras.
A short proof of the fact that the matrix trace is the expectation of the numerical values
Tomasz Kania
Mathematics , 2014,
Abstract: Using the fact that the normalised matrix trace is the unique linear functional $f$ on the algebra of $n\times n$ matrices which satisfies $f(I)=1$ and $f(AB)=f(BA)$ for all $n\times n$ matrices $A$ and $B$, we derive a well-known formula expressing the normalised trace of a complex matrix $A$ as the expectation of the numerical values of $A$; that is the function $\langle Ax,x\rangle$, where $x$ ranges the unit sphere of $\mathbb{C}^n$.
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