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Found 6515 publications

Algorithm for D-V cells and fundamental domains, E4 space groups with broken translations in the icosahedral family

László Ács Emil Molnár

Publication Name: Journal for Geometry and Graphics

Publication Date: 2002-01-01

Volume: 6

Issue: 1

Page Range: 1-16

Description:

As a continuation of our earlier work [2] we extend our algorithm for E4-space groups in the icosahedral family, where non-lattice translations (broken translations) occur as well. So we obtain new 4-polytopes as fundamental domains from D-V cells of crystallographic orbits. We illustrate our situations by some characteristic examples. A computer program will produce further results.

Open Access: Yes

DOI: DOI not available

Algorithm for D-V cells and fundamental domains, E4 space groups with broken translations in the icosahedral family

No authors available

Publication Name: Journal for Geometry and Graphics

Publication Date: 2002-01-01

Volume: 6

Issue: 1

Page Range: 1-16

Description:

As a continuation of our earlier work [2] we extend our algorithm for E4-space groups in the icosahedral family, where non-lattice translations (broken translations) occur as well. So we obtain new 4-polytopes as fundamental domains from D-V cells of crystallographic orbits. We illustrate our situations by some characteristic examples. A computer program will produce further results.

Open Access: No

DOI: DOI not available

Small delay inertial manifolds under numerics: A numerical structural stability result

George R. Sell Gyula Farkas

Publication Name: Journal of Dynamics and Differential Equations

Publication Date: 2002-01-01

Volume: 14

Issue: 3

Page Range: 549-588

Description:

In this paper we formulate a numerical structural stability result for delay equations with small delay under Euler discretization. The main ingredients of our approach are the existence and smoothness of small delay inertial manifolds, the C1-closeness of the small delay inertial manifolds and their numerical approximation and M.-C. Li's recent result on numerical structural stability of ordinary differential equations under the Euler method. © 2002 Plenum Publishing Corporation.

Open Access: Yes

DOI: 10.1023/A:1016335115301

Nectar production, honeybee visitation and fruit set of peach flowers

L. Szalay P. Benedek J. Nyéki Z. Szabó

Publication Name: Acta Horticulturae

Publication Date: 2002-01-01

Volume: 592

Issue: Unknown

Page Range: 537-541

Description:

Peach varieties grown in Hungary are self-fertile and set sufficient fruit under favourable weather conditions by natural self-pollination. The literature as well as our observations, suggests that bee pollination enhances fruit set even in selffertile varieties. The nectar production (0.30-9.09 mg/flower) and its dry matter content (12.5-58.1 %) varied widely by variety and sampling date. In relation to other stone fruit species peach was relatively low in nectar production (2.2 mg/flower) as well as in dry matter content (30.5 %). In spite of the low nectar, honeybees frequently visited production peach flowers. The reason for that is due to the early blooming time of peach, when honeybees have less available resources. Under favourable weather conditions (sunshine, calm warm weather) 20 % of the flowers on a branch were visited within a 10-minute period. Thus the same flower received several visits during one day. About half the bees visiting peach flowers were nectar gatherers. Another 27 % were pollen collectors and the remaining 23 % displayed mixed behaviour of collecting both pollen and nectar. The limitation of honeybee visits impaired the fruit set less in peaches than in other stone fruit species. Nevertheless, fruit set was markedly different between open flowers and isolated (bagged) flowers.

Open Access: Yes

DOI: 10.17660/ActaHortic.2002.592.72

Quantitative determination of protein of bacterial origin on the basis of D-aspartic acid and D-glutamic acid content

G. Pohn J. Schmidt É Csokona É Varga-Visi Zs Csapó-Kiss J. Csapó

Publication Name: Chromatographia

Publication Date: 2002-01-01

Volume: 56

Issue: SUPPL.

Page Range: S169-S171

Description:

In recent decades several methods have been developed for determination of the proportion of nitrogen-containing substances passed from the rumen into the abomasum, or small intestine, which are of microbial origin. Recently, when examining the D-amino acid content of foodstuffs, particularly milk and milk products, it was observed that, in addition to D-alanine (D-Ala), D-glutamic acid (D-Glu) and D-aspartic acid (D-Asp) can also be detected in similar quantities, primarily in products which have links with bacterial activity. This gave rise to the idea of examining the diaminopimelic acid (DAPA), D-Glu, and D-Asp content of bacteria extracted from the rumen of cattle, and that of chyme from the same cattle, to establish whether D-Asp and D-Glu can be used to estimate protein of bacterial origin. The investigations performed have provided evidence that both D-Asp and D-Glu might be appropriate for determination of protein of bacterial origin. The results obtained using these two bacterial markers (D-Asp and D-Glu) proved to be approximately 10% lower than those obtained using DAPA; this was not because of to error attributable to the new markers but rather to the unreliability of determination using DAPA Analyses performed on samples of known bacterial protein content indicate that D-Asp and D-Glu gave almost identical results for bacterial protein content which were very close to the theoretical (calculated) values.

Open Access: Yes

DOI: 10.1007/bf02494132

Public-Private Partnership (PPP) as a social game

P. Scharle

Publication Name: Innovation

Publication Date: 2002-01-01

Volume: 15

Issue: 3

Page Range: 227-252

Description:

Discrepancy between social demands and public resources has become apparent in many countries worldwide. Institutions and industries involved in public services seek new forms of collaboration and combine all available public and private skills to circumvent problems. Advocates of public-private partnership (PPP) assess the progress as convincing. Reserved observers argue that the technique has immanent weaknesses. Putting the phenomena, experience, and discussion into a wider context of gaming helps to arrive at a better comprehension. The paper focuses on road transportation infrastructure issues but its conclusions are of broader interest. Four perspectives are chosen to discuss PPP as a gaming issue. Linguistics, the mathematical theory of games, experimental psychology and the theory of institutions offer useful analytical concepts, theorems and approaches. The gaming perspective allows us to identify and define more clearly several uncertain or misinterpreted situations or actions experienced in PPP implementations. The conceptual identification of positions, motivations and further characteristics is not only possible but helps all partners to better understand the structure, the rules and roles given in the procedure. Use of the gaming perspective in PPP issues seems to enhance 'fair play'. Expected trends of development and further areas of suggested research are derived from the conclusions and conjectures. Application of the gaming perspective is recommended in the development of project delivery techniques, education and training.

Open Access: Yes

DOI: 10.1080/1351161022000027630

Hungary, Hungarian national report on the principle of ne bis in idem

Péter Polt Norbert Kis Balázs Gellér

Publication Name: Revue Internationale De Droit Penal

Publication Date: 2002-01-01

Volume: 73

Issue: 3-4

Page Range: 989-1007

Description:

No description provided

Open Access: Yes

DOI: 10.3917/ridp.733.0989

Stability properties of positive solutions to partial differential equations with delay

Gyula Farkas Peter L. Simo

Publication Name: Electronic Journal of Differential Equations

Publication Date: 2001-12-01

Volume: 2001

Issue: Unknown

Page Range: XCXXI-XCXXII

Description:

We investigate the stability of positive stationary solutions of semilinear initial-boundary value problems with delay and convex or concave nonlinearity. If the nonlinearity is monotone, then in the convex case /(O) < 0 implies instability and in the concave case /(O) > 0 implies stability. Special cases are shown where the monotonicity assumption can be weakened or omitted. ©2001 Southwest Texas State University.

Open Access: Yes

DOI: DOI not available

Railway simulation with the CASSANDRA simulation system

Gábor Szucs

Publication Name: Journal of Computing and Information Technology

Publication Date: 2001-01-01

Volume: 9

Issue: 2

Page Range: 133-142

Description:

In this paper a railway simulator will be presented and illustrated with a railway network model, which is used for education, i.e. the training of railway system operators. The new railway simulation system is developed using a general simulation software, CASSANDRA that is usable not only for the railway network building but for planning, analysis and optimum finding as well.

Open Access: Yes

DOI: 10.2498/cit.2001.02.04