165 research outputs found
On the continuity of the integrated density of states in the disorder
Recently, Hislop and Marx studied the dependence of the integrated density of
states on the underlying probability distribution for a class of discrete
random Schr\"odinger operators, and established a quantitative form of
continuity in weak* topology. We develop an alternative approach to the
problem, based on Ky Fan inequalities, and establish a sharp version of the
estimate of Hislop and Marx. We also consider a corresponding problem for
continual random Schr\"odinger operators on .Comment: 9 pages, generalization of continuous case to any dimension (Theorem
2, part 1), expanded introduction, added references, fixed a few typo
Comfortable Accessible Urban Environment when Designing an Object on the Example of a Children's Educational Center
В настоящей статье приведено исследование комфортной доступной среды для дальнейшего проектирования детского образовательного центра. Рассмотрены цели, задачи и методика исследования детского образовательного центра. Были рассмотрены основные принципы формирования комфортной среды и проведена параллель на проектируемый объект детского центра. При рассмотрении вопросов были выдвинуты выводы и заключения по проделанному исследованию.In this article, a study is given of a comfortable accessible environment for the further design of a children's educational center. The goals, tasks and methods of research of the children's educational center are considered. The main principles of creating a comfortable environment were considered and a parallel was made to the projected facility of the children's center. When examining issues, conclusions and conclusions were made on the research done
Continuity of the measure of the spectrum for quasiperiodic Schrodinger operators with rough potentials
We study discrete quasiperiodic Schr\"odinger operators on \ell^2(\zee)
with potentials defined by -H\"older functions. We prove a general
statement that for and under the condition of positive Lyapunov
exponents, measure of the spectrum at irrational frequencies is the limit of
measures of spectra of periodic approximants. An important ingredient in our
analysis is a general result on uniformity of the upper Lyapunov exponent of
strictly ergodic cocycles.Comment: 15 page
Agent-based modeling of the impact of advertising on the regional economic cluster lifecycle
The aim of the study is the development and testing of an algorithm for modeling the impact of advertising on various stages of the life cycle of economic clusters. It is assumed, that the life cycle of the cluster consists of the stages: a diffuse group, a hidden cluster, an evolving cluster, a mature cluster, a collapsing cluster. Using the agent-based simulation methods, hierarchical clustering and chaos theory, the following results were obtained: a conceptual model of the behavior of cluster members for cluster formation processes at each stage of the cluster life cycle and an imitation model of the influence of advertising on the life cycle of the economic cluster; the patterns of various stages of the life cycle of the economic cluster and the functioning of the cluster without influence and under the influence of advertising were revealed. Advertising reduces the time at the stages of the associated life cycle of the cluster, increases the stage of maturity of the cluster. Companies that do not comply with the principles of clustering are under the influence of advertising and promotional activities. Such enterprises most often arise in the cluster at the stages of its formation
IA-CCF: Individual accountability for permissioned ledgers
Permissioned ledger systems allow a consortium of members that do not trust one another to execute transactions safely on a set of replicas. Such systems typically use Byzantine fault tolerance (BFT) protocols to distribute trust, which only ensures safety when fewer than 1/3 of the replicas misbehave. Providing guarantees beyond this threshold is a challenge: current systems assume that the ledger is corrupt and fail to identify misbehaving replicas or hold the members that operate them accountable—instead all members share the blame. We describe IA-CCF, a new permissioned ledger system that provides individual accountability. It can assign blame to the individual members that operate misbehaving replicas regardless of the number of misbehaving replicas or members. IA-CCF achieves this by signing and logging BFT protocol messages in the ledger, and by using Merkle trees to provide clients with succinct, universally-verifiable receipts as evidence of successful transaction execution. Anyone can audit the ledger against a set of receipts to discover inconsistencies and identify replicas that signed contradictory statements. IACCF also supports changes to consortium membership and replicas by tracking signing keys using a sub-ledger of governance transactions. IA-CCF provides strong disincentives to misbehavior with low overhead: it executes 47,000 tx/s while providing clients with receipts in two network round trips
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