649 research outputs found
Исследование влияния неоднородности характеристик исходного материала кремния на параметры фотоэлектрических преобразователей
Предложены методики и устройства для бесконтактного локального измерения электрофизических параметров Si. С их помощью проведено исследование неоднородности удельного сопротивления, времени жизни неравновесных носителей заряда и типа проводимости в пластинах кремния, из которой затем были изготовлены фотоэлектрические преобразователи. Представлены результаты влияния неоднородного распределения электрофизических параметров в подложке фотоэлектрических преобразователей на его эффективность
Cooperative Learning Approach to Delivering Professional Modules to Bachelor and Master Students: TPU Experience
Modern tendencies in engineering education set certain requirements on the competences to be obtained. To enable a future engineer to work at a highly competitive level and become an internationally recognized specialist, they must possess advanced English speaking and writing skills. At present most universities introduce educational programs that attract bright domestic and international students to ensure that they are in demand at the global market. The Strategic Program on Competitiveness Enhancement of National Research Tomsk Polytechnic University proposes that modules of professional training should be developed and delivered in English as a language of instruction so that the quality of teaching could be raised. To develop their own approaches to teaching, improve their language proficiency and develop courses and their elements in English, TPU teachers are to meet these challenging requirements and design course documentation and teaching aids, and engage modern teaching approaches in order to ensure high quality work with student groups which are often mixed in their abilities in both professional subjects and language proficiency levels. This paper addresses the course "Professional Training in English" which was developed upon completion of the joint program of TPU and the University of Southampton "Delivering through the Medium of English" and has successfully been delivered to bachelor students with the major "Oil and Gas Engineering" using the cooperative learning approach. The cooperative learning approach has proved to be one of the most successful in terms of teaching professional English to groups of students with mixed abilities
Pockets of Proterozoic hydrocarbons and implications for the Archaean
Precambrian biomarkers convey invaluable information
about the early evolution of life, ancient ecosystems, redox
conditions, climate and depositional environment and
prospective petroleum systems. They are however thermally
unstable, easily obliterated by contamination and thus
extremely difficult to find. This is particularly true if
conditions favourable for biomarker preservation had to
prevail for more than 2.5 billion years – the prerequisite for
finding Archaean biomarkers. Many organic geochemists
abandoned this hope after original discoveries of Archaean
biomarkers proved to be of younger origin [1,2] but our study
of ca. 550-825 Ma old sediments from the Centralian
Superbasin now shows that biomarkers can be preserved in
distinctive pockets in seemingly barren areas, even if sections
are metamorphosed in parts. Most Centralian sections seem
empty. Yet, eventually we identified intervals with preserved
biomarkers in three drill cores. A detailed investigation of 825
Ma sediments in drill core Mt Charlotte-1 revealed maturity
variations that are most likely due to hydrothermal influence
and in turn control the hydrocarbon preservation. Sediments
might appear metamorphosed after localized, subtle alteration
by hydrothermal fluids but protected intervals can still contain
biomarkers. The same might be true for Archaean sediments
and we might still find those protected intervals with
indigenous biomarkers that allow us to glimpse the early life
on earth
Автоматизация учета и анализа проведения ремонтных работ в котельном цехе ООО "ЮТЭЦ"
В статье представлена разработка информационной системы для автоматизации учета и анализа проведения ремонтных работ в котельном цехе ООО «ЮТЭЦ». Для разработки информационной системы выбрана платформа «1С: Предприятие». Показаны созданные в системе основные объекты: справочники, документы, отчеты.The article presents the development of an information system for the automation of accounting and analysis of repair work in the boiler room. For the development of the information system, the 1C: Enterprise platform was chosen. The main objects created in the system are shown: directories, documents, reports
X-ray tomography of the aerospace products
Currently, non-destructive methods are increasingly being used to inspect the critical components in different branches of industry. Special focus is on the usage of high-energy X-ray microtomography used to inspect large objects with high density. This method provides high accuracy and a possibility to measure the internal and external dimensions of the test sample without its destruction. It allows obtaining the information about internal defects and damages as well as manufacturing and assembling quality. This article describes a tomographic study of a medium-size high-density sample with a resolution about of 70 microns
Oxidative Coupling as a Biomimetic Approach to the Synthesis of Scytonemin
The first total synthesis of the dimeric alkaloid pigment scytonemin is described. The key transformations In Its synthesis from 3-indole acetic acid are a Heck carbocyclization and a Suzuki-Miyaura cross-coupling, orchestrated In a stereospecific tandem fashion, followed by a biosynthetically inspired oxidative dimerization. The tandem sequence generates a tetracyclic (E)-3-(arylidene)-3,4-dihydrocyclopenta[b]indol-2(1H)-one that is subsequently dimerized into the unique homodimeric core structure of scytonemin
Tectono-thermal evolution of Oman's Mesozoic passive continental margin under the obducting Semail Ophiolite: a case study of Jebel Akhdar, Oman
We present a study of pressure and temperature evolution in the passive
continental margin under the Oman Ophiolite using numerical basin models
calibrated with thermal maturity data, fluid-inclusion thermometry, and
low-temperature thermochronometry and building on the results of recent work
on the tectonic evolution. Because the Oman mountains experienced only weak
post-obduction overprint, they offer a unique natural laboratory for this
study.
Thermal maturity data from the Adam Foothills constrain burial in the basin
in front of the advancing nappes to at least 4 km. Peak temperature
evolution in the carbonate platform under the ophiolite depends on the
burial depth and only weakly on the temperature of the overriding nappes,
which have cooled during transport from the oceanic subduction zone to
emplacement. Fluid-inclusion thermometry yields pressure-corrected
homogenization temperatures of 225 to 266 ∘C for veins formed
during progressive burial, 296–364 ∘C for veins related to peak
burial, and 184 to 213 ∘C for veins associated with late-stage
strike-slip faulting. In contrast, the overlying Hawasina nappes have not
been heated above 130–170 ∘C, as witnessed by only partial
resetting of the zircon (U-Th)/He thermochronometer.
In combination with independently determined temperatures from solid bitumen
reflectance, we infer that the fluid inclusions of peak-burial-related veins
formed at minimum pressures of 225–285 MPa. This implies that the rocks of
the future Jebel Akhdar Dome were buried under 8–10 km of ophiolite on top
of 2 km of sedimentary nappes, in agreement with thermal maturity data
from
solid bitumen reflectance and Raman spectroscopy.
Rapid burial of the passive margin under the ophiolite results in
sub-lithostatic pore pressures, as indicated by veins formed in dilatant
fractures in the carbonates. We infer that overpressure is induced by rapid
burial under the ophiolite. Tilting of the carbonate platform in combination
with overpressure in the passive margin caused fluid migration towards the
south in front of the advancing nappes.
Exhumation of the Jebel Akhdar, as indicated by our zircon (U-Th)/He data and
in agreement with existing work on the tectonic evolution, started as early
as the Late Cretaceous to early Cenozoic, linked with extension above a
major listric shear zone with top-to-NNE shear sense. In a second exhumation
phase the carbonate platform and obducted nappes of the Jebel Akhdar Dome
cooled together below ca. 170 ∘C between 50 and 40 Ma before the
final stage of anticline formation.</p
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