227 research outputs found
Multilevel Clustering Fault Model for IC Manufacture
A hierarchical approach to the construction of compound distributions for
process-induced faults in IC manufacture is proposed. Within this framework,
the negative binomial distribution is treated as level-1 models. The
hierarchical approach to fault distribution offers an integrated picture of how
fault density varies from region to region within a wafer, from wafer to wafer
within a batch, and so on. A theory of compound-distribution hierarchies is
developed by means of generating functions. A study of correlations, which
naturally appears in microelectronics due to the batch character of IC
manufacture, is proposed. Taking these correlations into account is of
significant importance for developing procedures for statistical quality
control in IC manufacture. With respect to applications, hierarchies of yield
means and yield probability-density functions are considered.Comment: 10 pages, the International Conference "Micro- and Nanoelectronics-
2003" (ICMNE-2003),Zvenigorod, Moscow district, Russia, October 6-10, 200
Modeling of immune life history and body growth: the role of antigen burden
In this paper, a recently developed mathematical model of age related changes in population of peripheral T cells (Romanyukha, Yashin, 2003) is used to describe ontogenetic changes of the immune system. The treatise is based on the assumption of linear dependence of antigen load from basal metabolic rate, which, in turn, depends on body mass following the allometric relationship – 3/4 power scaling law (Kleiber, 1932; West, Brown, 2005). Energy cost of antigen burden, i.e. the energy needed to produce and maintain immune cells plus the energy loss due to infectious diseases, is estimated and used as a measure of the immune system effectiveness. The dependence of optimal resource allocation from the parameters of antigen load is studied.
Processing of Discard Tailings and Non-conventional raw Materials using efficient upgrading Processes
At Russian alluvial deposits , precious metals are nor-mally recovered with the aid of simple ore dressing units, such as washing slices.Particles of precious metals with a size of less than 100 um are not recovered by this method. Centrifugal apparatus and processing technology have been developed for recovery of fine and ultra fine particles of precious metals ensuring recoveries of up to 90-97% and producing a product containing 1-2% Au. This technology is environmentally sound and does not impose any nega-tive impact on the ambient environment. The tailings generated by a DM-250 dredge have a gold content front 0.5 to 1.5 g/t, of which about 85% has it particle size, of less than 50 um. The use of proposed centrifugal equipment at an alluvial operation for processing of dredge tailings made it possible to produce concentrate with a gold content of 1.1 kg /tat with a gold recovery of 92.7%
Method and Experimental Setup for the Study of the Local Current Distribution in Conducting Micro-and Nanostructures
The method for the study of the spatial distribution of current in micro-and nanostructures on the
measured magnetic field is presented. The methods of studies the magnetic field distribution of conducting
nanostructures by passing a transport current are considered. The technique of current recovery from experimental
data is offered.
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Continuation of the exponentially small transversality for the splitting of separatrices to a whiskered torus with silver ratio
We study the exponentially small splitting of invariant manifolds of
whiskered (hyperbolic) tori with two fast frequencies in nearly-integrable
Hamiltonian systems whose hyperbolic part is given by a pendulum. We consider a
torus whose frequency ratio is the silver number . We show
that the Poincar\'e-Melnikov method can be applied to establish the existence
of 4 transverse homoclinic orbits to the whiskered torus, and provide
asymptotic estimates for the tranversality of the splitting whose dependence on
the perturbation parameter satisfies a periodicity property. We
also prove the continuation of the transversality of the homoclinic orbits for
all the sufficiently small values of , generalizing the results
previously known for the golden number.Comment: 17 pages, 2 figure
Distance Education: Imbalance between Possibilities and Threats
Purpose: To quantify the opportunities and threats arising from the spontaneous expansion of distance learning in the wake of the pandemic and measures to counteract its spread.Research methods: ex-pert analysis, fuzzy logic, comparative analysis.Results and conclusions. The analysis of three groups of experts’ opinions: employers, university professors and students showed not-high values of revealed possibilities, connected with distance learning. Among them the average level of assessment reached: the increase of the level of computer literacy and the possibility of learning without disconnecting from the main activity in any geographical location. The latter opportunity is given more importance by employers than by teachers and students. Many threats of distance learning are evaluated as having a very high and high importance. The highest level of threat of reduction of the level of practical knowledge is marked by all expert groups. Almost the same level of significance was assigned by all expert groups to the negative impact of long-term computer use on students’ health. Opinions of expert groups differ with regard to other threats. Employers are the most cautious about them, they single out several other significant threats connected with the learning process – decrease of emotional component of the educational process and teachers’ lack of mastery of computer technologies which does not provide transfer of the necessary amount of information to students. Teachers and students assess these threats as less significant. The threats noted actualize the need to: strengthen the practical orientation of training in both distance and face-to-face format, expanding the competence of teaching staff in the field of computer technology, developing a system to counteract the negative impact of long-term use of computers on the health of students
Bose-Einstein condensate as a diagnostic tool for an optical lattice formed by 1064 nm laser light
Recently, the thulium atom has been cooled down to the temperature of
Bose-Einstein condensation. While the condensate of the thulium atom has a lot
of applications in quantum simulations and other areas of physics, it can also
serve as a unique diagnostic tool for many atomic experiments. In the present
study, the Bose-Einstein condensate of the thulium atom was successfully
utilized to diagnose an optical lattice and detect unwanted reflections in the
experiments with the 1064 nm optical lattice, which will further be used in a
quantum gas microscope experiment
LATE PALEOZOIC CONTRASTING MAGMATISM OF THE EASTERN KAAKHEM MAGMATIC AREA (CENTRAL ASIAN OROGENIC BELT)
Based on the isotope-geochronological (zircons, U-Pb method), petrogeochemical, and structural and petrologic data, the following paper provides a detailed description of the characteristics of the Late Paleozoic basic and granitoid magmatism in the eastern part of the Kaakhem magmatic area (Eastern Tuva). During the formation of the Shivey alkaline-granitoid and Chadal gabbroid massifs in the period of 292–283 Ma, there were revealed two stages of contrasting magmatism. The early stage is characterized by the formation of plutonic mingling structures and intermediate rocks. Deformation structures, widespread in the early-mingling rocks, are superimposed and formed in extensional regime. At a later stage, there occurred a sequential intrusion of salic and mafic magmas into the zones of local extension in the early-mingling host rocks. A similar petrogeochemical composition of basic rocks of the early and late mingling indicates that they all formed from enriched magma. Granosyenites and granites are derived from melting of tonalities and metasedimentary rocks with a significant contribution of the mantle component. The simultaneous formation of the Chadal gabbroid and Shivei granitoid massifs took place at the intraplate stage of the development of geological structures of Eastern Tuva in the Late Paleozoic
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