Особенности оценки и нормирования естественной убыли нефтепродуктов в эластичных резервуарах

An effective technique for experimental studies to determine the losses of petroleum products in flexible tanks is suggested. Standards of technological losses of petroleum products on the permeability, swelling and wetting flexible tanks are defined.Разработана эффективная технология проведения экспериментальных исследований по определению потерь нефтепродуктов в эластичных резервуарах. Определены нормы технологических потерь нефтепродуктов от проницаемости, набухания и смачивания оболочки эластичных резервуаров

Вопросы использования термопластичных рукавов для нефтепродуктов в условиях холодного климата

The possibility of using pressure thermoplastic hoses in the Arctic and the Far North is evaluated. The conclusion that the replacement of rubber hoses on the thermoplastic will reduce 2.5 times their material consumption, extend the 10-15 C temperature range of operating temperatures, eliminate the influence of sleeve material on fuel quality, improve the strength characteristics and terms of use is presented.С температурный диапазон рабочих температур, исключить влияние материала рукава на качество горючего, повысить прочностные характеристики и сроки эксплуатации

Перспективы развития полевых складов горючего

The use of thermoplastic polyurethanes in collapsible tanks design will improve the environmental safety of 2.0-2.5 times, extend the temperature range of operation up to 30%, reduce the effort required to deploy a warehouse in 2.5 - 3.0 times.Исследованы вопросы совершенствования эксплуатационных характеристик полевых складов горючего. Использование термопластичных полиуретанов в конструкции эластичных резервуаров позволит повысить экологическую безопасность в 2,0 - 2,5 раза, расширить температурный диапазон эксплуатации до 30%, снизить трудозатраты на развертывание склада в 2,5 - 3,0 раза. Обоснована критичность технологии производства конструкционных материалов на основе термопластичного полиуретана из отечественного сырья

Self-adaptive approach for optimisation of passive control systems for seismic resistant buildings

The concept of passive control of the seismic response of structures was introduced to improve the performance of structures by increasing their energy dissipation and reduce or eliminate damage in the structural elements. The key task in the design of passive systems is to determine the forces in the control devices (yield/slip or post-tensioning) at each floor, that will result in best performance (e.g. minimum inter-storey drift). This can be achieved by large parametric studies in which both the maximum control force (e.g. at ground level) and the distribution of forces along the height of the structure are varied. Alternatively, optimum forces in the devices can be achieved by semi-active control, where the structure self-adapts to the earthquake. Both solutions are expensive: the first requires hundreds of non-linear response simulations in the design stage; the second needs a system of sensors, controllers and electromechanical devices. Presented here is a new Self Adaptive Optimisation Approach (SAOA) in which the self-optimisation of a semi-active system is used in the design stage and the resulting distribution of control forces is adopted as a passive system. The new approach was evaluated through comparing the simulated dynamic responses of two relatively simple benchmark structures (braced and post-tensioned) with three sets of control forces: (1) passive system with forces obtained in parametric study, (2) semi-active system with self-adapting control forces, and (3) passive system with SAOA-optimized forces. The results show good performance of the SAOA systems, indicating that SAOA offers a simple and effective solution that can replace the existing optimisation approaches for the design of passively controlled earthquake resistant structures. This study presents a novel idea of using the semi-active control as a tool for optimising a passive control system. The passive control systems can be further improved by a larger study in which the semi-active control algorithms are also optimised

EVALUATION AND RATIONING OF NATURAL LOSS OF OIL PRODUCTS IN FLEXIBLE TANKS

An effective technique for experimental studies to determine the losses of petroleum products in flexible tanks is suggested. Standards of technological losses of petroleum products on the permeability, swelling and wetting flexible tanks are defined

Estimation of RC slab-column joints effective strength using neural networks

The nominal strength of slab-column joints made of highstrength concrete (HSC) columns and normal strength concrete (NSC) slabs is of great importance in structural design and construction of concrete buildings. This topic has been intensively studied during the last decades. Different types of column-slab joints have been investigated experimentally providing a basis for developing design provisions. However, available data does not cover all classes of concretes, reinforcements, and possible loading cases for the proper calculation of joint stresses necessary for design purposes. New numerical methods based on modern software seem to be effective and may allow reliable prediction of column-slab joint strength. The current research is focused on analysis of available experimental data on different slab-to-column joints with the aim of predicting the nominal strength of slabcolumn joint. Neural networks technique is proposed herein using MATLAB routines developed to analyze available experimental data. The obtained results allow prediction of the effective strength of column-slab joints with accuracy and good correlation coefficients when compared to regression based models. The proposed method enables the user to predict the effective design of column-slab joints without the need for conservative safety coefficients generally promoted and used by most construction codes