[Objectives]To make targeted breeding of new type of Shuxuan beef cattle,study and determine the breeding target traits of new type of Shuxuan beef cattle.[Methods]The difference method was used to calculate the margi...[Objectives]To make targeted breeding of new type of Shuxuan beef cattle,study and determine the breeding target traits of new type of Shuxuan beef cattle.[Methods]The difference method was used to calculate the marginal benefit of each target trait,and the economic weight of the corresponding breeding target trait was obtained.[Results]The marginal benefits of weaning weight,fattening daily gain,18-month weight,carcass quality,dressing percentage,pure meat percentage,age at first calving,calving interval and stay group time were 35.86,13.76,13.05,421.96,375.55,22.58,-4.45,-27.53,and 1555.24,respectively.The relative economic weight ratio of growth traits,carcass traits,and reproductive traits was close to 4∶1∶5.Through marginal benefit analysis,the economic benefits obtained by improving carcass quality,dressing percentage and stay group time were significantly higher than other traits.[Conclusions]It is expected to provide a theoretic basis for establishing the target trait selection indicators for the new type of Shuxuan beef cattle.展开更多
With the continuous expansion of the scale of renewable energy installation,the demand for energy storage has increased significantly.However,there are significant differences in the value of energy storage in differe...With the continuous expansion of the scale of renewable energy installation,the demand for energy storage has increased significantly.However,there are significant differences in the value of energy storage in different scenarios,and the phenomenon of diminishing marginal benefits of energy storage is becoming more apparent.Therefore,themulti-dimensional value evolution trend of energy storage has become a key issue.This study selects indicators from three dimensions of energy storage:low-carbon emission reduction,smoothing wind and solar power fluctuations,and saving generation costs,quantifying the economic,environmental,and technical values of energy storage.This forms a quantitative evaluation system for energy storage value.By comparing the calculated system values under different energy storage capacities,the marginal value evolution trend of energy storage is obtained.Meanwhile,considering factors such as the utilization rate of renewable energy,the change in energy storage value under different scenarios is analyzed.The results show that the value of long-duration energy storage is significantly affected by the energy storage capacity.Specifically,when the charge-discharge efficiency of longduration energy storage reaches 0.6 or above,the system value increases significantly.Additionally,appropriately reducing the cost of energy storage capacity also helps to improve its system value.展开更多
Autonomous vehicles are currently developed, and are expected to be introduced gradually. Society needs a basis for decisions regarding market interventions. This study identifies, quantifies and values the benefits a...Autonomous vehicles are currently developed, and are expected to be introduced gradually. Society needs a basis for decisions regarding market interventions. This study identifies, quantifies and values the benefits and costs of autonomous trucks and cars considering generalized costs, external effects and social marginal cost pricing to consumers with Swedish data. The results show that the greatest benefits are saved driver costs for trucks and decreased travel time costs for car drivers. In the example calculations, capital costs may increase by 22 percent for cars and 36 percent for trucks for benefits to exceed costs in 2025. Subsidies are not needed since the producers and consumers get the major benefits and pay the costs.展开更多
基金Key Technology R&D Program of Sichuan Province(2019YFD0123)Key R&D Project of Sichuan Science and Technology Plan(2021YFYZ0001)Sichuan Beef Cattle Innovation Team of Modern Agricultural Industrial Technology System(SCCXTD-2021-13).
文摘[Objectives]To make targeted breeding of new type of Shuxuan beef cattle,study and determine the breeding target traits of new type of Shuxuan beef cattle.[Methods]The difference method was used to calculate the marginal benefit of each target trait,and the economic weight of the corresponding breeding target trait was obtained.[Results]The marginal benefits of weaning weight,fattening daily gain,18-month weight,carcass quality,dressing percentage,pure meat percentage,age at first calving,calving interval and stay group time were 35.86,13.76,13.05,421.96,375.55,22.58,-4.45,-27.53,and 1555.24,respectively.The relative economic weight ratio of growth traits,carcass traits,and reproductive traits was close to 4∶1∶5.Through marginal benefit analysis,the economic benefits obtained by improving carcass quality,dressing percentage and stay group time were significantly higher than other traits.[Conclusions]It is expected to provide a theoretic basis for establishing the target trait selection indicators for the new type of Shuxuan beef cattle.
基金supported financially by Thematic Project of the State Grid Liaoning Electric Power Company Limited Economic Research Institute under Grant SGLNJY00GHJS2310109.
文摘With the continuous expansion of the scale of renewable energy installation,the demand for energy storage has increased significantly.However,there are significant differences in the value of energy storage in different scenarios,and the phenomenon of diminishing marginal benefits of energy storage is becoming more apparent.Therefore,themulti-dimensional value evolution trend of energy storage has become a key issue.This study selects indicators from three dimensions of energy storage:low-carbon emission reduction,smoothing wind and solar power fluctuations,and saving generation costs,quantifying the economic,environmental,and technical values of energy storage.This forms a quantitative evaluation system for energy storage value.By comparing the calculated system values under different energy storage capacities,the marginal value evolution trend of energy storage is obtained.Meanwhile,considering factors such as the utilization rate of renewable energy,the change in energy storage value under different scenarios is analyzed.The results show that the value of long-duration energy storage is significantly affected by the energy storage capacity.Specifically,when the charge-discharge efficiency of longduration energy storage reaches 0.6 or above,the system value increases significantly.Additionally,appropriately reducing the cost of energy storage capacity also helps to improve its system value.
文摘Autonomous vehicles are currently developed, and are expected to be introduced gradually. Society needs a basis for decisions regarding market interventions. This study identifies, quantifies and values the benefits and costs of autonomous trucks and cars considering generalized costs, external effects and social marginal cost pricing to consumers with Swedish data. The results show that the greatest benefits are saved driver costs for trucks and decreased travel time costs for car drivers. In the example calculations, capital costs may increase by 22 percent for cars and 36 percent for trucks for benefits to exceed costs in 2025. Subsidies are not needed since the producers and consumers get the major benefits and pay the costs.