Скелетная изомеризация гептанов в присутствии суперкислотных катализаторов различной природы

The sequence of the formation of multi-branched heptane isomers was studied in liquid and gaseous phases over different liquid and solid superacid catalysts. It was found that this sequence does not depend on the phase state, catalyst nature, and conditions, evidencing in favor of common reaction mechanism. The 2,4-dimethylpentane transformation into 2,2-dimethylpentane can be explained by the intermediate formation of cyclobutyl carbocation.Экспериментально изучена последовательность образования разветвленных изомеров при превращении н-гептана в жидкой и газовой фазах под действием различных жидких и твердого суперкислотных катализаторов. Найдено, что эта последовательность не зависит от фазового состояния, природы катализаторов и условий, что свидетельствует об общем механизме реакции. Превращение 2,4-диметилпентана в 2,2-диметилпентан можно объяснить промежуточным образованием циклобутильного карбкатиона

Skeletal isomerization of heptanes over superacid catalysts of different nature

The sequence of the formation of multi-branched heptane isomers was studied in liquid and gaseous phases over different liquid and solid superacid catalysts. It was found that this sequence does not depend on the phase state, catalyst nature, and conditions, evidencing in favor of common reaction mechanism. The 2,4-dimethylpentane transformation into 2,2-dimethylpentane can be explained by the intermediate formation of cyclobutyl carbocation

Extra lightweight mechanical support structures with the integrated cooling system for a new generation of vertex detectors

The performance of new extra lightweight mechanical support structures with the integrated liquid cooling system for monolithic silicon pixel detectors has been investigated. These detectors will be used to upgrade the inner tracking system in the ALICE experiment at the CERN Large Hadron Collider. The extra lightweight mechanical support structures, together with the novel pixel detectors, provide a record-breaking total radiation length of 0.3% X 0 per layer, which will make it possible to considerably extend the physical program of investigations of the quark-gluon plasma in ultra-relativistic heavy-ion collisions at the Large Hadron Collider. This is particularly important in measuring the yields of heavy-flavor hadrons and low-mass dileptons with low transverse momenta. The experimental results of the thermal tests and the comparative analysis of five samples of extra lightweight mechanical support structures for monolithic silicon pixel detectors are presented. The high efficiency of heat drain using the liquid cooling system for a power density as high as 0.5 W/cm2 is show

Multi-purpose detector system for investigations of multinucleon transfer reactions

Section V. Equipment, Methods and Automation of Nuclear Experiments, Interaction of Nuclear Radiation with the Matter and Applications of Methods of Nuclear Physic

Multi-purpose detector system for investigations of multinucleon transfer reactions

Section V. Equipment, Methods and Automation of Nuclear Experiments, Interaction of Nuclear Radiation with the Matter and Applications of Methods of Nuclear Physic

Investigations of the new generation pixel detectors for ALICE experiment at LHC

We present the results from testing Monolithic Active Pixel Sensors of the detector ALPIDE (ALICE Pixel Detector). The purpose of these tests was to measure the pixel threshold and noise distributions in each of the four sectors of the detector, as well as the analysis of the hit maps produced by different radioactive sources

Experimental investigation of new ultra-lightweight support and cooling structures for the new Inner Tracking System of the ALICE Detector

Thermal cooling performances of extremely lightweight mechanical carbon fiber support structures with an integrated liquid cooling system for monolithic silicon pixel detectors have been investigated. The high heat removal efficiency using single-phase liquid flow is shown for a power density up to 0.5 W/cm$^2$. These solutions provide therefore possibility to build a detector with a record radiation length of 0.3% per layer, ensuring considerable extensions of the physical program of investigations of the quark-gluon plasma in ultra-relativistic heavy-ion collisions at the Large Hadron Collider