Blockchain - booster of the Russian forest information systems

Digitalization of the Russian forest sector is successfully developing. The first Unified State Automated Information System for timber accounting and transactions (LesEGAIS) has been operating since December 30, 2015 and continues to improve. In 2023, it will be qualitatively transformed into the Federal State Information System of the Forestry Sector FGIS LK. However, these systems continue to be built on centralized databases and rapidly outdated information concepts of the last century. They do not consider the fundamentally new opportunities that the new breakthrough information technology of the distributed ledger (the blockchain) provides to the forest. © Published under licence by IOP Publishing Ltd

Использование силомоментных датчиков в системах управления манипуляторами

The paper reveals an application of force-moment sensors in manipulator control systems. Maintenance of contact between an object and a manipulator is rather complicated task and it does not have definitive solution. The paper contains mathematical description of various manipulator control methods with application of feedback force loop. Regimes of manipulator control are changeable in accordance with the problem which is to be solved.Статья посвящена использованию силомоментных датчиков в системах управления манипуляторами. Поддержание контакта с предметом - сложная задача, которая не имеет однозначного решения. Приводится математическое описание различных способов управления манипулятором с использованием контура обратной связи по силе. Режимы управления манипулятором изменяются в зависимости от решаемой задачи

Blockchain - killer of illegal wood

Distributed Ledger Technology (DTL) is a leading technologies in the current "digital revolution". The new technology is a real boon for the national forest sector. It may bring the Russian forest sector to the forefront of competitiveness and efficiency. However, the internal shortcomings, dangers, and threats of the new technology should be timely studied and eliminated. The "digit"is as strong as nuclear power. It is able to bestowhumanity or cause a global catastrophe if mishandled andmistreated. This fully applies to the forestry sector. © Published under licence by IOP Publishing Ltd

Critical points and resonance of hyperplane arrangements

If F is a master function corresponding to a hyperplane arrangement A and a collection of weights y, we investigate the relationship between the critical set of F, the variety defined by the vanishing of the one-form w = d log F, and the resonance of y. For arrangements satisfying certain conditions, we show that if y is resonant in dimension p, then the critical set of F has codimension at most p. These include all free arrangements and all rank 3 arrangements.Comment: revised version, Canadian Journal of Mathematics, to appea