730 research outputs found
An algebraic formula for the index of a vector field on an isolated complete intersection singularity
Let (V,0) be a germ of a complete intersection variety in \CC^{n+k}, n>0,
having an isolated singularity at 0 and X be the germ of a holomorphic vector
field on \CC^{n+k} tangent to V and having on V an isolated zero at 0. We show
that in this case the homological index and the GSV-index coincide. In the case
when the zero of X is also isolated in the ambient space \CC^{n+k} we give a
formula for the homological index in terms of local linear algebra.Comment: 18 pages; added an example which is not quasi homogeneous. A script
calculating this example can be found at
http://www.iag.uni-hannover.de/~bothmer/gobelin/ or at the and of the source
file of this articl
The elimination of surface cross-hatch from relaxed, limited-area Si1 – xGex buffer layers
The influence of lateral dimensions on the relaxation and surface topography of linearly graded Si1 – xGex buffer layers has been investigated. A dramatic change in the relaxation mechanism has been observed for depositions on Si mesa pillars of lateral dimensions 10 µm and below. Misfit dislocations are able to extend unhindered and terminate at the edges of the growth zone, yielding a surface free of cross-hatch. For lateral dimensions in excess of 10 µm orthogonal misfit interactions occur and relaxation is dominated by the modified Frank–Read (MFR) mechanism. The stress fields associated with the MFR dislocation pile-ups result in a pronounced cross-hatch topography
On the rationality of the moduli space of L\"uroth quartics
We prove that the moduli space M_L of L"uroth quartics in P^2, i.e. the space
of quartics which can be circumscribed around a complete pentagon of lines
modulo the action of PGL_3(CC) is rational, as is the related moduli space of
Bateman seven-tuples of points in P^2.Comment: 7 page
Marangoni convection in droplets on superhydrophobic surfaces
We consider a small droplet of water sitting on top of a heated superhydrophobic surface. A toroidal convection pattern develops in which fluid is observed to rise along the surface of the spherical droplet and to accelerate downwards in the interior towards the liquid/solid contact point. The internal dynamics arise due to the presence of a vertical temperature gradient; this leads to a gradient in surface tension which in turn drives fluid away from the contact point along the interface. We develop a solution to this thermocapillary-driven Marangoni flow analytically in terms of streamfunctions. Quantitative comparisons between analytical and experimental results, as well as effective heat transfer coefficients, are presented.National Science Foundation (U.S.) (CTS-045609)National Science Foundation (U.S.) (CCF-0323672
Адаптация персонала организации на примере сети кафе «Пельмени Project»
Объектом исследования является–система адаптации персонала в кафе «Пельмени Project» и разработка путей ее совершенствования.
Предметом исследования является – система адаптации персонала.
Цель работы– оценка системы адаптации и разработка методов ее совершенствования в кафе «Пельмени Project». В процессе исследования проводился комплексный опрос. В результате исследования были разработаны рекомендации по улучшению системы адаптации персоналом в кафе «Пельмени Project».
Степень внедрения:система адаптации молодых сотрудников в кафе
«Пельмени Project» находится на хорошем уровне, проводятся различные мероприятия для благоприятной адаптации на работе, несмотря на это, все равно существует ряд недоработок в этой области, подтверждением тому является текучка кадров и неудовлетворенность новых сотрудников.The object of this study is to adapt the system-staff in the cafe "Dumplings Project» and to develop ways to improve it. The subject issledovaniyayavlyaetsya - personnel system adaptation.
The purpose work- evaluation system to adapt and develop methods to improve it in the cafe "Dumplings Project». The study conducted a comprehensive survey. The study developed recommendations to improve the personnel system to adapt to the cafe "Dumplings Project».
Degree of implementation: adapting the system of young staff in the cafe
"Dumplings Project» is at a good level, hosts a variety of
supportive measures for adaptation to work, in spite of this, all
still there are some shortcomings in this area, confirming that
is staff turnover and dissatisfaction with the new employees
Interference of Higgs boson resonances in mu^+ mu^- -> neutralino_i neutralino_j with longitudinal beam polarization
We study the interference of resonant Higgs boson exchange in neutralino
production in \mu^+ \mu^- annihilation with longitudinally polarized beams. We
use the energy distribution of the decay lepton in the process \neutralino_j
\to \ell^\pm \slepton^\mp to determine the polarization of the neutralinos. In
the CP conserving Minimal Supersymmetric Standard Model a non-vanishing
asymmetry in the lepton energy spectrum is caused by the interference of Higgs
boson exchange channels with different CP eigenvalues. The contribution of this
interference is large if the heavy neutral bosons H and A are nearly
degenerate. We show that the asymmetry can be used to determine the couplings
of the neutral Higgs bosons to the neutralinos. In particular, the asymmetry
allows to determine the relative phase of the couplings. We find large
asymmetries and cross sections for a set of reference scenarios with nearly
degenerate neutral Higgs bosons.Comment: 20 pages, 6 figures, minor typos corrected, to appear in Eur. Phys.
J.
Influencing factors for the digital transformation in the financial services sector
Digital transformation affects almost every area in societies and has consequences for incumbent companies. With qualitative research, we explore the influencing factors for digital transformation in the financial services sector. We use a PEST-model and Porter’s Five Forces as the underlying structure for our analysis. Our interviews and findings show that the financial services sector face the same current challenges, but their impact is perceived higher in the banking than in the insurance sector concerning social factors and bargaining power of buyers. The character of the current development is evolutionary rather than disruptive. Almost all incumbents currently focus on modernizing and consolidating their backend-systems. The aim is to enable them for new customer-oriented services. A primary driver for the digital transformation is the threat of a broader market entry by BigTechs. Our research provides a comprehensive overlook about the influencing factors of digital transformation using statements from experts in the field. © 2020, The Author(s)
Development of a device to simulate tooth mobility
Objectives: The testing of new materials under simulation of oral conditions is essential in medicine. For simulation of fracture strength different simulation devices are used for test set-up. The results of these in vitro tests differ because there is no standardization of tooth mobility in simulation devices. The aim of this study is to develop a simulation device that depicts the tooth mobility curve as accurately as possible and creates reproducible and scalable mobility curves. Materials and methods: With the aid of published literature and with the help of dentists, average forms of tooth classes were generated. Based on these tooth data, different abutment tooth shapes and different simulation devices were designed with a CAD system and were generated with a Rapid Prototyping system. Then, for all simulation devices the displacement curves were created with a universal testing machine and compared with the tooth mobility curve. With this new information, an improved adapted simulation device was constructed. Results: A simulations device that is able to simulate the mobility curve of natural teeth with high accuracy and where mobility is reproducible and scalable was developed
Localization criteria for Anderson models on locally finite graphs
We prove spectral and dynamical localization for Anderson models on locally
finite graphs using the fractional moment method. Our theorems extend earlier
results on localization for the Anderson model on \ZZ^d. We establish
geometric assumptions for the underlying graph such that localization can be
proven in the case of sufficiently large disorder
Diskussion zum Beitrag: Die gegenwärtige Situation, soziologisch betrachtet (Wiese, Leopold von)
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