Farm location is an important factor in dairy farms, as it is closely associated with temperature and humidity that are crucial factors of influencing the physiological conditions and productivity of cows especially d...Farm location is an important factor in dairy farms, as it is closely associated with temperature and humidity that are crucial factors of influencing the physiological conditions and productivity of cows especially during the lactation period. The purpose of this study was to determine the effect of farm location on the physiological conditions and productivity of cows. The study was involved in 18 lactating Friesian-Holstein crossbreed cows in three farmer groups, i.e., Nangkasawit, Plalangan and Sumurejo. Temperature and humidity of the environment, rainfall and physiological conditions of cows （respiration rate, pulse, rectal temperature, total erythrocytes, hemoglobin and hematocrit） were observed. No influence （P 〉 0.05） of farm location on the parameters was observed, except for milk production （P 〈 0.05）. In conclusion, farm location had no impact on the physiological conditions of Friesian-Holstein crossbreed cows in the district Gunungpati Semarang, Central Java, Indonesia.展开更多
Large-scale wind farm integration has brought several aspects of challenges to the transient stability of power systems.This paper focuses on the research of the transient stability of power systems incorporating with...Large-scale wind farm integration has brought several aspects of challenges to the transient stability of power systems.This paper focuses on the research of the transient stability of power systems incorporating with wind farms by utilizing risk assessment methods.The detailed model of double fed induction generator has been established.Wind penetration variation and multiple stochastic factors of power systems have been considered.The process of transient stability risk assessment based on the Monte Carlo method has been described and a comprehensive risk indicator has been proposed.An investigation has been conducted into an improved 10-generator 39-bus system with a wind farm incorporated to verify the validity and feasibility of the risk assessment method proposed.展开更多
文摘Farm location is an important factor in dairy farms, as it is closely associated with temperature and humidity that are crucial factors of influencing the physiological conditions and productivity of cows especially during the lactation period. The purpose of this study was to determine the effect of farm location on the physiological conditions and productivity of cows. The study was involved in 18 lactating Friesian-Holstein crossbreed cows in three farmer groups, i.e., Nangkasawit, Plalangan and Sumurejo. Temperature and humidity of the environment, rainfall and physiological conditions of cows （respiration rate, pulse, rectal temperature, total erythrocytes, hemoglobin and hematocrit） were observed. No influence （P 〉 0.05） of farm location on the parameters was observed, except for milk production （P 〈 0.05）. In conclusion, farm location had no impact on the physiological conditions of Friesian-Holstein crossbreed cows in the district Gunungpati Semarang, Central Java, Indonesia.
基金This work is supported by State Grid Corporation of China,Major Projects on Planning and Operation Control of Large Scale Grid(SGCC-MPLG026-2012)National HI-Tech R&D Program of China(2011AA05A112).
文摘Large-scale wind farm integration has brought several aspects of challenges to the transient stability of power systems.This paper focuses on the research of the transient stability of power systems incorporating with wind farms by utilizing risk assessment methods.The detailed model of double fed induction generator has been established.Wind penetration variation and multiple stochastic factors of power systems have been considered.The process of transient stability risk assessment based on the Monte Carlo method has been described and a comprehensive risk indicator has been proposed.An investigation has been conducted into an improved 10-generator 39-bus system with a wind farm incorporated to verify the validity and feasibility of the risk assessment method proposed.
