scholarly journals Cassette Installation with Active Working Body in the Separating Partition

2018 ◽  
Vol 7 (3.2) ◽  
pp. 265
Author(s):  
Mykola Nesterenko ◽  
Ivan Nazarenko ◽  
Petro Molchanov
Keyword(s):  
Dynamic Characteristics ◽  
Single Type ◽  
Energy Costs ◽  
Partition Walls ◽  
Compaction Time ◽  
Resonance Oscillations

The article explores the vibration form for forming single-type Ferro-concrete products, where the partition walls as an active working body has the opportunity to be involved in resonance oscillations, which allows to reduce the compaction time and reduce the energy costs for manufacturing products. Partitions dynamic characteristics the as well as the effect of the partitions oscillations on the sealing medium are studied mathematically. 

scholarly journals Experimental study of a foam concrete based on local Tunisian materials

2018 ◽  
Vol 149 ◽  
pp. 01027
Author(s):  
Dorra Ellouze ◽  
Karim Miled
Keyword(s):  
Experimental Study ◽  
Building Materials ◽  
Building Envelope ◽  
Single Type ◽  
Foam Concrete ◽  
Technical Problems ◽  
Fine Grained ◽  
Partition Walls ◽  
The One ◽  
Local Materials

The building sector in Tunisia is very energy-intensive, the largest share of energy consumption comes from factories of building materials namely brick and cement plants. This work is part of the reduction of the energy bill in the building envelope. Indeed, the foam concrete can be walls in single or double wall with better insulating power. This paper presents an experimental study on the technical problems related to the formulation and manufacture of a new cellular concrete in Tunisia, called "foam" concrete, from Tunisian local materials. Indeed, six varieties of sand of different provenance and grain size will be analyzed, the "good" sand is the one that is best suited for the manufacture of foam concrete. Two clean, fine-grained (0/2mm) rolled grain sands were retained. Then four foam concretes were formulated using each time a single type of sand and varying the density namely 0.8 and 1. These four formulations were tested mechanically and thermally. The results found showed that compressive strengths do not exceed 1.5 MPa at 28 days. Thus, the foam concrete can be used only as a filling concrete in non-load bearing elements such as partition walls. The guarded hot plate method was used to determine the thermal conductivities of the four foamed concretes studied. A low thermal conductivity was found of the order of 0.22 W/m°K which prove the insulating power of foam concrete.

Hope, exploration, and equilibrated action schemes

2019 ◽  
Vol 42 ◽  
Author(s):  
Davood G. Gozli ◽  
Ci Jun Gao
Keyword(s):  
Single Type ◽  
Reward Seeking ◽  
Stable Scheme

AbstractThe concepts want, hope, and exploration cannot be organized in relation to a single type of motive (e.g., motive for food). They require, in addition, the motive for acquiring and maintaining a stable scheme that enables reward-directed activity. Facing unpredictability, the animal has to seek not only reward, but also a new equilibrated state within which reward seeking is possible.

Wind-energy costs

IEE Review ◽  
1988 ◽  
Vol 34 (3) ◽  
pp. 115
Author(s):  
A.W. Kidd
Keyword(s):  
Wind Energy ◽  
Energy Costs

Invited PaperTemperature dependence of SiGe HBT static and dynamic characteristics

1998 ◽  
Vol 08 (PR3) ◽  
pp. Pr3-81-Pr3-86
Author(s):  
F. Aniel ◽  
N. Zerounian ◽  
A. Gruhle ◽  
C. Mähner ◽  
G. Vernet ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Static And Dynamic Characteristics ◽  
Sige Hbt

Oil Prices: Limits to Growth and the Depth of Falling

2006 ◽  
pp. 28-41 ◽  
Author(s):  
I. Bashmakov
Keyword(s):  
Energy Demand ◽  
Negative Relationship ◽  
Oil Prices ◽  
Production Factor ◽  
Energy Costs ◽  
Purchasing Power ◽  
Limits To Growth ◽  
Technological Basis ◽  
Production Factors ◽  
Output Ratio

This article deals with the determination of future oil prices. The approach used is based on the evaluation of purchasing power limits and allows to put the limits to monopolistic price setting. Several important findings are formulated: going beyond the upper thresholds of purchasing power stipulates negative relationship between energy costs and GDP growth rates, and this brings the dynamics to energy demand to price elasticity. This approach is also based on what the author calls the economics of constants and variables, i.e. on the existence of very stable macroeconomic proportions, which may be observed throughout the whole period of statistical observations (over 200 years). It provides grounds for two conclusions. First, the upper limit of energy costs to the gross output ratio is determined by the least acceptable profitability. Second, the theoretical postulate on substantial production factors substitution used in the production functions theory may be incorrect. In reality, the change of the economy technological basis leads to the substitution of low quality production factor by the same factor with a higher quality. Application of this approach brings the basis for predicting oil prices for 2006-2008.

Optimization of elemental chlorine-free bleaching for a softwood kraft pulp • part 2: economic analysis of chemical and steam consumption

TAPPI Journal ◽  
2010 ◽  
Vol 9 (9) ◽  
pp. 47-53 ◽  
Author(s):  
BRIAN N. BROGDON
Keyword(s):  
Chlorine Dioxide ◽  
Previous Investigation ◽  
Kraft Pulp ◽  
Energy Costs ◽  
Alkaline Extraction ◽  
Stage Versus ◽  
Kraft Pulps ◽  
Steam Consumption ◽  
Elemental Chlorine ◽  
Softwood Kraft Pulp

Our previous investigation [1] re-analyzed the data from Basta and co-workers (1992 TAPPI Pulping Conference) to demonstrate how oxidative alkaline extraction can be augmented and how these changes affect chlorine dioxide consumption with elemental chlorine-free (ECF) sequences. The current study manipulates extraction delignification variables to curtail bleaching costs with a conventional U.S. Southern softwood kraft pulp. The economic advantages of ~0.35% to 0.65% H2O2 peroxide reinforcement in a 70°C (EOP)-stage versus 90°C (EO)-stage are predisposed to the brightness targets, to short or long bleach sequences, and to mill energy costs. Minimized bleaching costs are generally realized when a 90°C (EO) is employed in D0(EO)D1 bleaching, whereas a 70°C (EOP) is economically advantageous for D0(EOP)D1E2D2 bleaching. The findings we disclose here help to clarify previous ECF optimization studies of conventional softwood kraft pulps.

Some Dynamic Characteristics of Binary Near-Earth Asteroids

2017 ◽  
Vol 13 (1) ◽  
pp. 30-33
Author(s):  
N.V. Ivanenko ◽  
◽  
О.A. Bazyey ◽  
Keyword(s):  
Dynamic Characteristics ◽  
Near Earth Asteroids
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