High-Speed Apparatus for Determination of Plasticity in Rubber Works and Some Results

1939 ◽  
Vol 12 (2) ◽  
pp. 434-439 ◽  
Author(s):  
J. Hoekstra
Keyword(s):  
Chemical Process ◽  
High Speed ◽  
Production Costs ◽  
Total Production ◽  
Rubber Industry ◽  
Heavy Machinery ◽  
Aging Properties ◽  
Hydrocarbon Molecules ◽  
Rubber Stock

Abstract Since the day that Hancock invented his wooden masticator, plasticizing has been one of the outstanding features of the rubber industry. Although the application of rubber in the form of latex, thus avoiding the process of mechanical softening, is increasing, this does not imply that the use of heavy machinery for plasticizing coagulated rubber is lessening. It is now commonly accepted that plasticizing or mastication of rubber is a chemical process, occurring under combined mechanical and chemical (oxygen) influences and resulting in a diminishing of the length of the hydrocarbon molecules. This breakdown of rubber is of great technical importance, because the plasticity of rubber stock determines its workability. The degree of plasticizing or breakdown, especially when mastication has been prolonged, has also some effect on mechanical and aging properties after the plasticizing has been counterbalanced by the action of vulcanization. It follows from the foregoing that control of plasticity during fabrication is of great interest from a technological standpoint. From the standpoint of works economy the problem is not less urgent, because energy used by internal mixers and mixing rollers as well as extra costs resulting from wrong plasticity in calendering and moulding are of importance in total production costs.

scholarly journals ESTIMATION OF PROFIT FUNCTION OF WHEAT CROP IN DHI QAR PROVINCE

2020 ◽  
Vol 51 (Special) ◽  
Author(s):  
Barbaz &et al.
Keyword(s):  
Robust Regression ◽  
Production Costs ◽  
Wheat Crop ◽  
Profit Function ◽  
Total Production ◽  
Cross Sectional ◽  
Factors Affecting ◽  
Production Growth ◽  
White Test

This research aims to study the most important factors affecting profit function. Cross sectional data were used in the light of a random sample of 130 farmers in Dhi Qar province. The results showed that the proportion of costs of production inputs amounted to 73% of the total production costs. Also, profit function showed that the amount of output has a significant impact on profit compared to other independent variables since value of the parameter of the quantity of production amounted to about 308879 and was significant at the level of 1% according to t-test. The coefficient determination of about 93% for the equation estimated with OLS. However, heteroscedasticity was obvious according to the White Test. So the model was estimated using robust regression method to avoid this problem, but that led to a decrease in R2 to about 69%. The research recommended the need to increase the rates of production growth and productivity through an organized agricultural economic policy that links the policy of supporting input requirements, both in terms of reducing prices or providing quantity and quality, especially fertilizers and seeds in conjunction with the policy of supporting prices of output. Also, research recommended encouraging farmers to expand wheat crop cultivation in the province of Dhi Qar by increasing the cultivated areas.

Effect of Operating Conditions on the Life of Rubber Belts

1940 ◽  
Vol 13 (4) ◽  
pp. 962-968
Author(s):  
R. J. Perin
Keyword(s):  
High Temperatures ◽  
Technical Problem ◽  
Relative Effect ◽  
Operating Conditions ◽  
Common Condition ◽  
Rubber Industry ◽  
Belt Speed ◽  
Rubber Compounds ◽  
Aging Properties

Abstract The variation in life of rubber belting has been a major technical problem of the rubber industry for many years. Although rubber compounds have been greatly improved, both in flexing life and aging properties, the life of belts on certain types of drives has not increased accordingly. To determine the cause of this variation, a survey was made of the performance records of belts on all types of drives. From this survey it was possible to obtain data on those drives wherein the belt life fell below the average expectancy. An analysis of this information divided these premature failures into two groups, which were designated as “external” and “internal”. The former classification includes failures due to excessive slip, high temperatures, misalignment and other detrimental operating conditions. The latter group includes those failures with no signs of external damage, and where failure involves that common condition, internal separation of the plies. A further examination of the reports on internal failures showed that practically all the drives concerned had one or more of the following characteristics: small pulley diameters, high belt tension, or high belt speed. The problem then resolved into a determination of the relative effect of these conditions on belt life.

scholarly journals PENETAPAN BIAYA PRODUKSI TAYANGAN IKLAN DI MADU TV BIRO BLITAR

2020 ◽  
Vol 13 (2) ◽  
pp. 83-91
Author(s):  
Agustyas Retno Hernani ◽  
Endah Masrunik
Keyword(s):  
Transportation Costs ◽  
Production Costs ◽  
Total Production ◽  
Observation Method ◽  
Descriptive Qualitative

Production costs are costs contained in a product or service, so the costs incurred must be able to be identified and calculated correctly, so that the total production costs incurred are truly accurate. The purpose of this study is to find out what costs are contained in the determination of production costs for an advertisement and how to calculate them. The method used is descriptive qualitative, where data is collected by interview and observation method and then draws a conclusion from the results of these interviews and observations. The results of this study indicate that the production costs incurred for an advertisement are determined by the bureau which consists of equipment rental costs and crew costs or salaries (excluding basic salaries) then the amount is calculated and added with transportation costs

scholarly journals Overhead Allocations In Highly Automated Production Processes

2011 ◽  
Vol 6 (2) ◽  
pp. 41
Author(s):  
Ralph B. Fritzsch ◽  
Walter J. Berend
Keyword(s):  
Production Costs ◽  
Central Issue ◽  
Total Production ◽  
Product Cost ◽  
Automated Production ◽  
Current Process ◽  
Production Processes ◽  
Capital Intensive

The capital intensive nature of automated production processes has increased the proportion of total production costs which are classified as overhead. The increasing importance of overhead costs makes their treatment a central issue in the determination of product cost. This article examines current methods of changing overhead costs to product and suggests possible improvements in the current process.

Immaterial Cost and Production: Maximum Production Cost Level Through Marginal Approach

2020 ◽  
Vol 8 (2) ◽  
pp. 128-149
Author(s):  
Dini Maulana Lestari
Keyword(s):  
Quantitative Study ◽  
Marginal Cost ◽  
Production Cost ◽  
Maximum Level ◽  
Production Costs ◽  
Total Production ◽  
Sugar Factory ◽  
Maximum Production ◽  
Cost Approach ◽  
South Sulawesi

This paper will discuss about the immaterial costs and production yields at one of the refined sugar factory companies in Makassar, South Sulawesi. The theory is based on the fact that Immaterial is a cost that is almsgiving, meaning costs that are outside of the basic costs of the company in producing production, so this research aims to find out: (1) what is the production cost needed to produce this production, (2) the maximum level of production at company from 2013 to 2017. This type of research is a quantitative study because it uses a questionnaire in the form of values ​​that are processed using the marginal cost approach formula. The results of the analysis show that (1) the maximum level of production costs occurred in 2016 amounting to 6,912 with an Immaterial cost of Rp. 2,481,796,800 and the total production produced is 359,077.3 tons (2) The required workforce with the total production produced is 359,077.3 tones of 180 people including the maximum production point which means that the lowest value is achieved (optimal).    

MINIMALISASI BIAYA SIMPAN DAN BIAYA SETUP PADA MULTIPLE PRODUK: SIMULASI DENGAN CAPACITATED LOT SIZING PROBLEM

2019 ◽  
Vol 4 (2) ◽  
pp. 205-214
Author(s):  
Erika Fatma
Keyword(s):  
Production Cost ◽  
Lot Sizing ◽  
Setup Time ◽  
Production Costs ◽  
Total Production ◽  
Product Cycle ◽  
Lot Size ◽  
Setup Costs ◽  
Lot Sizing Problem ◽  
Capacitated Lot Sizing

Lot sizing problem in production planning aims to optimize production costs (processing, setup and holding cost) by fulfilling demand and resources capacity costraint. The Capacitated Lot sizing Problem (CLSP) model aims to balance the setup costs and inventory costs to obtain optimal total costs. The object of this study was a plastic component manufacturing company. This study use CLSP model, considering process costs, holding costs and setup costs, by calculating product cycle and setup time. The constraint of this model is the production time capacity and the storage capacity of the finished product. CLSP can reduce the total production cost by 4.05% and can reduce setup time by 46.75%.  Keyword: Lot size, CLSP, Total production cost.

Sampling, Preservation and Counting of Samples II: Zooplankton

2017 ◽  
Author(s):  
Peter H. Wiebe ◽  
Ann Bucklin ◽  
Mark Benfield
Keyword(s):  
Genetic Analysis ◽  
High Speed ◽  
Morphological Analysis ◽  
Taxonomic Composition ◽  
Sampling Techniques ◽  
Sample Analysis ◽  
Sample Preservation ◽  
The Past ◽  
Plankton Collection

This chapter reviews traditional and new zooplankton sampling techniques, sample preservation, and sample analysis, and provides the sources where in-depth discussion of these topics is addressed. The net systems that have been developed over the past 100+ years, many of which are still in use today, can be categorized into eight groups: non-opening/closing nets, simple opening/closing nets, high-speed samplers, neuston samplers, planktobenthos plankton nets, closing cod-end samplers, multiple net systems, and moored plankton collection systems. Methods of sample preservation include preservation for sample enumeration and taxonomic morphological analysis, and preservation of samples for genetic analysis. Methods of analysis of zooplankton samples include determination of biomass, taxonomic composition, and size by traditional methods; and genetic analysis of zooplankton samples.

Reynolds-averaged Navier–Stokes simulation of hydrofoil effects on hydrodynamic coefficients of a catamaran in forced oscillation

2016 ◽  
Vol 231 (2) ◽  
pp. 364-383
Author(s):  
Amin Najafi ◽  
Mohammad Saeed Seif
Keyword(s):  
High Speed ◽  
Experimental Approach ◽  
Navier Stokes ◽  
Hydrodynamic Coefficients ◽  
Laboratory Equipment ◽  
Factors Affecting ◽  
High Frequencies ◽  
Frequency Independent ◽  
Reynolds Averaged Navier Stokes

Determination of high-speed crafts’ hydrodynamic coefficients will help to analyze the dynamics of these kinds of vessels and the factors affecting their dynamic stabilities. Also, it can be useful and effective in controlling the vessel instabilities. The main purpose of this study is to determine the coefficients of longitudinal motions of a planing catamaran with and without a hydrofoil using Reynolds-averaged Navier–Stokes method to evaluate the foil effects on them. Determination of hydrodynamic coefficients by experimental approach is costly and requires meticulous laboratory equipment; therefore, utilizing the numerical methods and developing a virtual laboratory seem highly efficient. In this study, the numerical results for hydrodynamic coefficients of a high-speed craft are verified against Troesch’s experimental results. In the following, after determination of hydrodynamic coefficients of a planing catamaran with and without foil, the foil effects on its hydrodynamic coefficients are evaluated. The results indicate that most of the coefficients are frequency-independent especially at high frequencies.

THE DETERMINATION OF DIGITAL WIENER FILTERS BY MEANS OF GRADIENT METHODS

Geophysics ◽  
1973 ◽  
Vol 38 (2) ◽  
pp. 310-326 ◽  
Author(s):  
R. J. Wang ◽  
S. Treitel
Keyword(s):  
Seismic Data ◽  
High Speed ◽  
Gradient Methods ◽  
Wiener Filter ◽  
Gradient Algorithm ◽  
Rapid Convergence ◽  
True Solution ◽  
Peripheral Device ◽  
Wiener Filters

The normal equations for the discrete Wiener filter are conventionally solved with Levinson’s algorithm. The resultant solutions are exact except for numerical roundoff. In many instances, approximate rather than exact solutions satisfy seismologists’ requirements. The so‐called “gradient” or “steepest descent” iteration techniques can be used to produce approximate filters at computing speeds significantly higher than those achievable with Levinson’s method. Moreover, gradient schemes are well suited for implementation on a digital computer provided with a floating‐point array processor (i.e., a high‐speed peripheral device designed to carry out a specific set of multiply‐and‐add operations). Levinson’s method (1947) cannot be programmed efficiently for such special‐purpose hardware, and this consideration renders the use of gradient schemes even more attractive. It is, of course, advisable to utilize a gradient algorithm which generally provides rapid convergence to the true solution. The “conjugate‐gradient” method of Hestenes (1956) is one of a family of algorithms having this property. Experimental calculations performed with real seismic data indicate that adequate filter approximations are obtainable at a fraction of the computer cost required for use of Levinson’s algorithm.

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