scholarly journals Optimal Production Model for EVs Manufacturing Process in Turkey: A Comparable Case of EMQ/JIT Production Models for EVs’ Battery Production

2012 ◽  
Vol 58 ◽  
pp. 1482-1490 ◽  
Author(s):  
Bilgehan Yıldız ◽  
Murat Ustaoğlu
Keyword(s):  
Manufacturing Process ◽  
Production Model ◽  
Optimal Production ◽  
Production Models ◽  
Jit Production

scholarly journals Fisheries Reference Point and Stock Status of Croaker Fishery (Sciaenidae) Exploited from the Bay of Bengal, Bangladesh

2022 ◽  
Vol 10 (1) ◽  
pp. 63
Author(s):  
Partho Protim Barman ◽  
Md. Mostafa Shamsuzzaman ◽  
Petra Schneider ◽  
Mohammad Mojibul Hoque Mozumder ◽  
Qun Liu
Keyword(s):  
Bay Of Bengal ◽  
Maximum Sustainable Yield ◽  
Reference Points ◽  
Production Model ◽  
Fishing Pressure ◽  
Surplus Production ◽  
Stock Status ◽  
Management Measures ◽  
Production Models ◽  
The Monte Carlo Method

This research evaluated fisheries reference points and stock status to assess the sustainability of the croaker fishery (Sciaenidae) from the Bay of Bengal (BoB), Bangladesh. Sixteen years (2001–2016) of catch-effort data were analyzed using two surplus production models (Schaefer and Fox), the Monte Carlo method (CMSY) and the Bayesian state-space Schaefer surplus production model (BSM) method. This research applies a Stock–Production Model Incorporating Covariates (ASPIC) software package to run the Schaefer and Fox model. The maximum sustainable yield (MSY) produced by all models ranged from 33,900 to 35,900 metric tons (mt), which is very close to last year’s catch (33,768 mt in 2016). The estimated B > BMSY and F < FMSY indicated the safe biomass and fishing status. The calculated F/FMSY was 0.89, 0.87, and 0.81, and B/BMSY was 1.05, 1.07, and 1.14 for Fox, Schaefer, and BSM, respectively, indicating the fully exploited status of croaker stock in the BoB, Bangladesh. The representation of the Kobe phase plot suggested that the exploitation of croaker stock started from the yellow (unsustainable) quadrant in 2001 and gradually moved to the green (sustainable) quadrant in 2016 because of the reduction in fishing efforts and safe fishing pressure after 2012. Thus, this research suggests that the current fishing pressure needs to be maintained so that the yearly catch does not exceed the MSY limit of croaker. Additionally, specific management measures should implement to guarantee croaker and other fisheries from the BoB.

scholarly journals Research on Production Strategy with Carbon Emissions

2013 ◽  
Vol 7 (1) ◽  
pp. 9-13
Author(s):  
Honglei Tang ◽  
Guofang Song
Keyword(s):  
Numerical Experiment ◽  
Carbon Emissions ◽  
Carbon Emission ◽  
Production Model ◽  
Emission Permits ◽  
Optimal Production ◽  
Production Decisions ◽  
Manufacturing Enterprises ◽  
Production Strategy

This paper mainly studied the influence on the carbon emission permits and trading on the production strategy for manufacturing enterprises. The enterprises might obtain carbon emission permits in three different ways, i.e. government quota, market trading and purification treatment. The enterprises must make a tradeoff between them. The characteristic of purifying cost was analyzed. Then, an optimal production model with carbon emission permits and trading was established. Finally, a typical numerical experiment was employed to show the influence of the parameters on optimal production decisions.

Short-term Forecasting in Marine Fish Stocks

1981 ◽  
Vol 38 (10) ◽  
pp. 1247-1254 ◽  
Author(s):  
Max Stocker ◽  
Ray Hilborn
Keyword(s):  
Time Series ◽  
Marine Fish ◽  
Management Practice ◽  
Model Fitting ◽  
Production Model ◽  
Catch Per Unit Effort ◽  
Short Term ◽  
Fish Stocks ◽  
Production Models ◽  
The Difference

The predictive power of stock production models and simple time series methods was considered for five marine fish stocks. The distinction between model fitting and forecasting future short-term catch is discussed, as is the difference between techniques to forecast short-term yield, and techniques to calculate long-term management practice. Fox's procedure for fitting Pella and Tomlinson's stock production model, Schnute's method for fitting Schaefer's model, and Gulland's method are all considered. We found that all methods except that of Gulland work well for some stocks, and the relative performance of the methods depends upon the exploitation history of the stock. In several instances one of the best forecasts of next year's catch per unit effort (CPUE) was the previous year's CPUE, emphasizing the fact that a good forecasting technique may have no utility in determining management policies.Key words: production models, catch and effort, fisheries, management, catch forecasting, time series

scholarly journals Assessing the feasibility of forest plantation of native species: A case study of Agathis dammara and Eusideroxylon zwageri in Balikpapan, East Kalimantan, Indonesia

2019 ◽  
Vol 20 (9) ◽  
Author(s):  
Budi Setiawan ◽  
Abubakar M. Lahjie ◽  
Syahrir Yusuf ◽  
Yosep Ruslim
Keyword(s):  
Native Species ◽  
Net Present Value ◽  
Sustainable Forest Management ◽  
Production Model ◽  
Forest Plantation ◽  
Annual Increment ◽  
East Kalimantan ◽  
Production Models ◽  
Eusideroxylon Zwageri

Abstract. Setiawan B, Lahjie AM, Yusuf S, Ruslim Y. 2019. Assessing the feasibility of forest plantation of native species: A case study of Agathis dammara and Eusideroxylon zwageri in Balikpapan, East Kalimantan, Indonesia. Biodiversitas 20: 2453-2461. Plantation forest using native species is very important effort to support biodiversity conservation. Still, analysis on its feasibility is needed to guarantee the sustainable forest management. The research aims were to assess the feasibility of plantation forestry of Agathis dammara and Eusideroxylon zwageri based on production models and financial simulation of stands management. The production models were developed based on plantation forests in Balikpapan, East Kalimantan, Indonesia. Using these plantation we developed models to estimate tree volume, total volume per hectare, Mean Annual Volume Increment (MAI) and Current Annual Increment (CAI) for each species. Financial analyses were carried out to assess the Pay Back Period (PBP), Net Present Value (NPV), Net Benefit/Cost (B/C) Ratio, Internal Rate of Return (IRR) and Equivalent Annual Annuity (EAA). The results of production model showed that A. dammara stands would reach optimum production at the age of 25 years while that of E. zwageri at the age of 150 years. A. dammara stands produce higher MAI of 15.67 m3ha-1 year-1 and total volume of 383.72 m3ha-1 than E. zwageri with MAI 1.89 m3ha-1 year-1 and total volume of 282.78 m3ha-1. The result of financial analysis showed that A. dammara plantation had the IRR higher than the Minimum Acceptable Rate (MAR) and the Net B/C Ratio of higher than 1, while E. zwageri had the Net B/C Ratio of lower than 1. A. dammara plantation also had a positive NPV value of IDR 78,699,974 while E. zwageri plantation had a negative NPV value of IDR 91,439,292. These results suggest that developing A. dammara plantation is more desirable than E. zwageri plantation.

scholarly journals Environmental and Economic Sustainability of Table Grape Production in Italy

2020 ◽  
Vol 12 (9) ◽  
pp. 3670 ◽  
Author(s):  
Luigi Roselli ◽  
Arturo Casieri ◽  
Bernardo Corrado de Gennaro ◽  
Ruggiero Sardaro ◽  
Giovanni Russo
Keyword(s):  
Life Cycle ◽  
Environmental Impacts ◽  
Environmental Sustainability ◽  
Food Systems ◽  
Impact Analysis ◽  
Table Grape ◽  
Production Model ◽  
Economic Returns ◽  
Table Grapes ◽  
Production Models

In recent years, the environmental sustainability of agri-food systems has become a crucial issue. Agri-food firms are increasingly concerned with the implementation of viable environmentally friendly production processes. The environmental impacts of the table grape sector, as well as other fresh and not transformed food products, involve mainly the farming phase rather than the subsequent conditioning, transportation, packaging, and distribution phases. The purpose of this study was to assess the environmental impacts and the economic viability of three table grapes production models (i.e., early harvesting, normal harvesting, and delayed harvesting), based on the Italian tendone system, during the entire life cycle. The environmental impact analysis was performed using the life cycle assessment (LCA) approach, while the economic analysis was performed using the life cycle costing (LCC) approach. The results show that the early and the delayed production models generated the highest environmental burdens, but also the highest economic returns, compared to the normal harvesting production model. The main determinants of the environmental impacts and economic returns are discussed and some practical recommendations are given to improve the sustainability of all the surveyed production models, so to converge public and private interests.

scholarly journals Study on the Optimal Production Pressure of Different Types of Natural Gas Hydrate Based on Formation Stability

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Ting Sun ◽  
Yuan Chen ◽  
Jin Yang ◽  
Qingping Li ◽  
Weixin Pang
Keyword(s):  
Natural Gas ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Strain Curve ◽  
Reference Value ◽  
Natural Gas Hydrate ◽  
Optimal Production ◽  
Hydrate Reservoir ◽  
Production Models ◽  
Different Types

Natural gas hydrate is an ice-like crystal formed by methane and water, which is a new type of strategic energy with huge reserves. The exploitation of deep-sea hydrate will cause a large amount of decomposition of hydrate, which will decrease the sediment strength. In this paper, production models of different types of hydrate reservoirs under different BHP (bottom hole pressure) were established. Then, sensitivity analysis was conducted to determine parameters which have the most significant influence on formation subsidence. After that, hydrate formation failure was discussed using two different criteria: formation subsidence and stress-strain curve. Then, critical production pressure was determined. Through comparison, it was found that the criterion of formation subsidence is more suitable. Finally, based on this criterion, the optimal production pressure of different types of hydrate reservoir was determined. The work of this paper will provide a certain reference value for the efficient and safe production of hydrate in the future.

Separating recruitment and mortality time lags for a delay-difference production model

2015 ◽  
Vol 72 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Emilius A. Aalto ◽  
E.J. Dick ◽  
Alec D. MacCall
Keyword(s):  
Stock Assessment ◽  
Recovery Period ◽  
Time Lag ◽  
Simulated Data ◽  
Assessment Method ◽  
Production Model ◽  
Time Lags ◽  
Age At Maturity ◽  
Production Models ◽  
Pacific Rockfish

Many fishery production models implicitly incorporate a single time lag for both recruitment and mortality despite the fact that in populations of breeding adults, deaths occur yearly while the entry of new adults comes from juveniles born potentially many years prior to adulthood. Models that do not account for this difference in timing will overestimate abundance for a decreasing stock and underestimate increases during a recovery period. We investigated the effect of incorporating unequal recruitment and mortality time lags into depletion-based stock reduction analysis (DB-SRA), a stock assessment method for data-poor species. Using both simulated data and catch series of Pacific rockfish (Sebastes spp.), we found that for declining stocks with no mortality delay and a recruitment time lag equal to age-at-maturity, estimated overfishing limits were up to 40% lower than those from the model with both time lags equal to age-at-maturity. Deviation between the two models’ predictions increases with age-at-maturity and natural mortality rate, suggesting that time lag separation is most important for long-lived species. We propose a correction factor for net production models that eliminates stock overestimation due to implicitly equal time lags.

Mexico: Introduction

2018 ◽  
Author(s):  
Dolores Tierney
Keyword(s):  
Free Trade ◽  
Free Trade Agreement ◽  
Trade Agreement ◽  
Production Model ◽  
Present Moment ◽  
Film Culture ◽  
Ticket Price ◽  
Mexican Cinema ◽  
Production Models ◽  
Early Features

This introductory section acts as a platform for the director-centred film analyses of chapters 1, 2 and 3. As well as looking at Iñárritu, Cuarón and del Toro’s ongoing connections to Mexico’s national film culture and ‘industry,’ the section offers an account of their beginnings in feature filmmaking in Mexico and the industrial, political, legislative and production model changes propelled by neoliberalism (North American Free Trade Agreement, ticket price de-regulation, private production models) that have been instrumental in shaping both the failures (reduction in production numbers, exhibition crisis) and successes (1999-2002 critical renaissance) in Mexican cinema from 1990 to the present moment. These changes are key to understanding both Iñárritu, Cuarón and del Toro’s early features and the circumstances that propelled these directors’ periods of deterritorialized filmmaking in the United S+tates and Europe.

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