The Experts below are selected from a list of 233655 Experts worldwide ranked by ideXlab platform
Sean Pascoe - One of the best experts on this subject based on the ideXlab platform.
-
impacts of vessel Capacity Reduction programmes on efficiency in fisheries the case of australia s multispecies northern prawn fishery
Journal of Agricultural Economics, 2012Co-Authors: Sean Pascoe, Louisa Coglan, Andre E Punt, Catherine M DichmontAbstract:Capacity Reduction programmes, in the form of buybacks or decommissioning, have had relatively widespread application in fisheries in the US, Europe and Australia. A common criticism of such programmes is that they remove the least efficient vessels first, resulting in an increase in average efficiency of the remaining fleet, which tends to increase the effective fishing power of the remaining fleet. In this paper, the effects of a buyback programme on average technical efficiency in Australia’s Northern Prawn Fishery are examined using a multi-output production function approach with an explicit inefficiency model. As expected, the results indicate that average efficiency of the remaining vessels was generally greater than that of the removed vessels. Further, there was some evidence of an increase in average scale efficiency in the fleet as the remaining vessels were closer, on average, to the optimal scale. Key factors affecting technical efficiency included company structure and the number of vessels fishing. In regard to fleet size, our model suggests positive externalities associated with more boats fishing at any point in time (due to information sharing and reduced search costs), but also negative externalities due to crowding, with the latter effect dominating the former. Hence, the buyback resulted in a net increase in the individual efficiency of the remaining vessels due to reduced crowding, as well as raising average efficiency through removal of less efficient vessels.
-
impacts of vessel Capacity Reduction programs on the efficiency in fisheries the case of australia s multispecies in northern prawn fishery
IIFET2010 : International Institute of Fisheries Economics and Trade : Economics of fish resources and aquatic ecosystems: balancing uses balancing co, 2010Co-Authors: Sean Pascoe, Louisa Coglan, Andre E Punt, Catherine M DichmontAbstract:Capacity Reduction programs in the form of buybacks or decommissioning programs have had relatively widespread application in fisheries in the US, Europe and Australia. A common criticism of such programs is that they remove the least efficient vessels first, resulting in an increase in average efficiency of the remaining fleet. The effective fishing power of the fleet, therefore, does not decrease in proportion to the number of vessels removed. Further, reduced crowding may increase efficiency of the remaining vessels. In this paper, the effects of a buyback program on average technical efficiency in Australia’s Northern Prawn Fishery are examined using a multi-output distance function approach with an explicit inefficiency model. The results indicate that average efficiency of the remaining vessels was greater than that of the removed vessels, and that average efficiency of remaining vessels also increased as a result of reduced crowding.
-
eliminating excess Capacity implications for the scottish fishing industry
Marine Resource Economics, 2005Co-Authors: Diana Tingley, Sean PascoeAbstract:As in many other regions of the world, fisheries in Europe are generally considered to be overexploited, largely as a consequence of excessive levels of fishing Capacity. This has manifested itself in terms of depleted stocks of key species and poor economic performance of the industry. In this paper, the level of excess Capacity in the Scottish fleet is examined using a variant of the data envelopment analysis (DEA) approach that takes into account the additional costs of increasing fishing effort to achieve 'full utilisation.' Given the estimate of full Capacity production of each vessel, the fleet size and structure that is sufficient to take the current catch level is derived using an industry restructuring model. The economic benefits to the industry and employment impacts of achieving this Capacity Reduction are estimated.
Ziping Feng - One of the best experts on this subject based on the ideXlab platform.
-
non uniform effect on the thermal aging performance of lithium ion pouch battery
Applied Thermal Engineering, 2018Co-Authors: Wenji Song, Mingbiao Chen, Yongzhen Chen, Ziping FengAbstract:Abstract Non-uniform distribution of current density and temperature is inevitable especially in high C-rate and it can lead to bad performance of battery. Therefore, the non-uniform effect (non-uniform temperature, current density and aging) on the pouch battery performance is studied with experiment and simulation. A new method, which measures the direct current resistance (DCR) based on the discharge curve, is proposed to get more detail of resistance variation. The measurement shows that the resistance of Lithium-ion pouch battery with non-uniform temperature is similar to that of average temperature. Then, effect of non-uniform aging is simulated based on the electro-thermal coupled model. It is found that battery suffering non-uniform aging has smaller discharging Capacity relatively. The main cause for the discharge Capacity Reduction between the uniform and non-uniform aging battery is the big difference of local stoichiometry of cathode electrode θLiFePO4. The Capacity Reduction in 1 C rate occupies about 6% of the permissible Capacity loss. Finally, tabs of battery are changed in order to acquire uniform temperature distribution. Battery whose tabs are put on the middle of the top side and the bottom side has a better performance in the opinion of thermal analysis.
J R Dahn - One of the best experts on this subject based on the ideXlab platform.
-
synthesis characterization and thermal stability of lini1 3mn1 3co1 3 zmgzo2 lini1 3 zmn1 3co1 3mgzo2 and lini1 3mn1 3 zco1 3mgzo2
Chemistry of Materials, 2010Co-Authors: Fu Zhou, Xuemei Zhao, Zhonghua Lu, Xinhai Li, J R DahnAbstract:LiNi1/3Mn1/3Co1/3−zMgzO2, LiNi1/3−zMn1/3Co1/3MgzO2, and LiNi1/3Mn1/3−zCo1/3MgzO2 (0≤ z ≤ 1/3) were prepared from hydroxide precursors. The hydroxide precursors were heated with Li2CO3 at 900 °C to prepare the oxides. Rietveld refinements of XRD data show that Mg substitution for Co, Ni and Mn results in different degrees of cation mixing in the Li layer with very little cation mixing in LiNi1/3Mn1/3−zCo1/3MgzO2 and the most cation mixing in LiNi1/3Mn1/3Co1/3−zMgzO2. Electrochemical studies of the LiNi1/3Mn1/3Co1/3−zMgzO2, LiNi1/3−zMn1/3Co1/3MgzO2, and LiNi1/3Mn1/3−zCo1/3MgzO2 (0 ≤ z ≤ 1/3) samples were used to measure the rate of Capacity Reduction with Mg content, found to be about −389 (mAh/g)/(z = 1) independent of which cation was substituted by Mg. The impact of Mg substitution on the thermal stability of NMC samples was studied via accelerating rate calorimetry and compared with Al-substituted NMC samples. The substitution of Mg did not improve the thermal stability of the samples, independent of wh...
Scott R Summers - One of the best experts on this subject based on the ideXlab platform.
-
scaling trace organic contaminant adsorption Capacity by granular activated carbon
Environmental Science & Technology, 2010Co-Authors: Christopher J Corwin, Scott R SummersAbstract:The role of particle size on the Reduction of granular activated carbon (GAC) adsorption Capacity for trace organic contaminants by dissolved organic matter (DOM) is examined and applied to performance scale-up. The adsorption Capacity Reduction, termed fouling, must be scalable in order to use bench scale tests, such as the rapid small-scale column test (RSSCT) to predict full-scale breakthrough. Equilibrium adsorption Capacity tests with GAC preloaded with DOM and RSSCT breakthrough curves at three different GAC particle sizes indicate that GAC adsorption Capacity is dependent on GAC particle size when DOM is present. Thus, the RSSCT cannot be expected to match full-scale results regardless of which RSSCT design approach is used (constant or proportional diffusivity), unless a scaling factor is applied to the results. Proportional diffusivity RSSCT breakthrough curves demonstrate that surface concentration of DOM is not a good measure of fouling. It is hypothesized that pore blockage is the mechanism re...
-
scaling trace organic contaminant adsorption Capacity by granular activated carbon
Environmental Science & Technology, 2010Co-Authors: Christopher J Corwin, Scott R SummersAbstract:The role of particle size on the Reduction of granular activated carbon (GAC) adsorption Capacity for trace organic contaminants by dissolved organic matter (DOM) is examined and applied to performance scale-up. The adsorption Capacity Reduction, termed fouling, must be scalable in order to use bench scale tests, such as the rapid small-scale column test (RSSCT) to predict full-scale breakthrough. Equilibrium adsorption Capacity tests with GAC preloaded with DOM and RSSCT breakthrough curves at three different GAC particle sizes indicate that GAC adsorption Capacity is dependent on GAC particle size when DOM is present. Thus, the RSSCT cannot be expected to match full-scale results regardless of which RSSCT design approach is used (constant or proportional diffusivity), unless a scaling factor is applied to the results. Proportional diffusivity RSSCT breakthrough curves demonstrate that surface concentration of DOM is not a good measure of fouling. It is hypothesized that pore blockage is the mechanism responsible for the dependence on particle size. As GAC particle size increases, the microporous surface area behind a constricted pore also increases. The result is lower adsorption Capacity per mass of adsorbent in the larger GAC particles. A scaling methodology for equilibrium and breakthrough data is presented that accounts for the dependence of NOM preloading effects on GAC particle diameter.
Koji Hayashi - One of the best experts on this subject based on the ideXlab platform.
-
a study on the cause of deterioration in float charged lithium ion batteries using limn2o4 as a cathode active material
Journal of The Electrochemical Society, 2011Co-Authors: Tomonobu Tsujikawa, Kaho Yabuta, Takashi Matsushita, Masayasu Arakawa, Koji HayashiAbstract:The deterioration mechanism of float-charged lithium-ion batteries with lithium manganese oxide spinel as the cathode active material was investigated in order to improve battery lifetime, which is especially important for Li-ion batteries used in backup applications. After lengthy charging at a constant voltage, the cathodes and anodes of deteriorated batteries were tested electrochemically and analyzed. The Capacity deterioration of the anode was 18.4%, and that of the cathode was 5.7%, although the Reduction in the cell Capacity was 41.9%. Electron probe microanalysis revealed the manganese deposition on the anode, suggesting that the Reduction in battery Capacity was caused by a decrease in the number of mobile lithium ions because the manganese deposition may occur instead of lithium insertion into the anode during charging. However, a precise comparison of the decrease in the number of mobile lithium ions caused by the manganese deposition and the battery Capacity Reduction showed that the Capacity Reduction cannot be explained by the manganese deposition alone. Side reactions related to the deposited manganese that accompanies the loss of electric charge may be occurring at the anode as well.
