A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service st...A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service stations. In this paper the inventory theory including its background and characteristics is introduced. At the same time, the application of the theory in some trades today, especially in petroleum trade, is analyzed. Then (s, S) stochastic model is advanced, which is established according to the principle of operational research and, based on this model, a sample is given, which discusses the details of application in the stock control of service stations. The sample is simplified but implies the validity of the model in optimizing the storage of petroleum products in the market.展开更多
A signal probability and activity probability (SPAP) model was proposed firstly, to estimate the impacts of the negative bias temperature instability (NBTI) and positive bias temperature instability (PBTI) on power ga...A signal probability and activity probability (SPAP) model was proposed firstly, to estimate the impacts of the negative bias temperature instability (NBTI) and positive bias temperature instability (PBTI) on power gated static random access memory (SRAM). The experiment results show that PBTI has significant influence on the read and write operations of SRAM with power gating, and it deteriorates the NBTI effects and results in a up to 39.38% static noise margin reduction and a 35.7% write margin degradation together with NBTI after 106 s working time. Then, a circuit level simulation was used to verify the assumption of the SPAP model, and finally the statistic data of CPU2000 benchmarks show that the proposed model has a reduction of 3.85% for estimation of the SNM degradation after 106 s working time compared with previous work.展开更多
The evolution of land use/land cover(LULC)patterns significantly influences the dynamics of carbon storage(CS)in terrestrial ecosystems.In response to future environmental changes,however,most studies fail to synthesi...The evolution of land use/land cover(LULC)patterns significantly influences the dynamics of carbon storage(CS)in terrestrial ecosystems.In response to future environmental changes,however,most studies fail to synthesize the effects of policy pathways and evolving core driving factors on LULC projections.This article presents a systematic framework to assess the dynamic response of the terrestrial ecosystem CS to future LULC changes.After investigating spatiotemporal characteristics and driving forces,policy effects and future core driving factors are integrated into the improved Markov–future land use simulation model to project LULC across diverse scenarios.Then the Integrated Valuation of Ecosystem Service and Tradeoff model is coupled to explore CS dynamics with LULC changes.This framework was applied to the Weihe River Basin.The finding reveals that the overall proportion of cultivated land,forestland and grassland is above 85%and is significantly influenced by policy effects.Precipitation,temperature,population density and gross domestic product are core driving factors of LULC changes.Equal-interval projection is a viable approach to mitigate policy impacts by avoiding error propagation while coupling future core driving factors to improve LULC projection accuracy.Ecological protection should be emphasized in the future.The rate of increase in CS is 1.25 and 1.63 times higher than the historical trend and economic development scenario,respectively,which alleviates carbon loss from the expansion of built-up land.This research provides a valuable reference for future insight and optimization of ecological conservation strategies.展开更多
文摘A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service stations. In this paper the inventory theory including its background and characteristics is introduced. At the same time, the application of the theory in some trades today, especially in petroleum trade, is analyzed. Then (s, S) stochastic model is advanced, which is established according to the principle of operational research and, based on this model, a sample is given, which discusses the details of application in the stock control of service stations. The sample is simplified but implies the validity of the model in optimizing the storage of petroleum products in the market.
基金Projects(60873016, 61170083) supported by the National Natural Science Foundation of ChinaProject(20114307110001) supported by the Doctoral Fund of Ministry of Education of China
文摘A signal probability and activity probability (SPAP) model was proposed firstly, to estimate the impacts of the negative bias temperature instability (NBTI) and positive bias temperature instability (PBTI) on power gated static random access memory (SRAM). The experiment results show that PBTI has significant influence on the read and write operations of SRAM with power gating, and it deteriorates the NBTI effects and results in a up to 39.38% static noise margin reduction and a 35.7% write margin degradation together with NBTI after 106 s working time. Then, a circuit level simulation was used to verify the assumption of the SPAP model, and finally the statistic data of CPU2000 benchmarks show that the proposed model has a reduction of 3.85% for estimation of the SNM degradation after 106 s working time compared with previous work.
基金supported by the China Postdoctoral Science Foundation(2022M722561)the National Natural Science Foundation of China(51679186)+1 种基金the Water Science and Technology Program of Shaanxi(Program No.2018slkj-4)the Natural Science Basic Research Program of Shaanxi(Program No.2021JLM-45).
文摘The evolution of land use/land cover(LULC)patterns significantly influences the dynamics of carbon storage(CS)in terrestrial ecosystems.In response to future environmental changes,however,most studies fail to synthesize the effects of policy pathways and evolving core driving factors on LULC projections.This article presents a systematic framework to assess the dynamic response of the terrestrial ecosystem CS to future LULC changes.After investigating spatiotemporal characteristics and driving forces,policy effects and future core driving factors are integrated into the improved Markov–future land use simulation model to project LULC across diverse scenarios.Then the Integrated Valuation of Ecosystem Service and Tradeoff model is coupled to explore CS dynamics with LULC changes.This framework was applied to the Weihe River Basin.The finding reveals that the overall proportion of cultivated land,forestland and grassland is above 85%and is significantly influenced by policy effects.Precipitation,temperature,population density and gross domestic product are core driving factors of LULC changes.Equal-interval projection is a viable approach to mitigate policy impacts by avoiding error propagation while coupling future core driving factors to improve LULC projection accuracy.Ecological protection should be emphasized in the future.The rate of increase in CS is 1.25 and 1.63 times higher than the historical trend and economic development scenario,respectively,which alleviates carbon loss from the expansion of built-up land.This research provides a valuable reference for future insight and optimization of ecological conservation strategies.
