In this research, the result of the cloud seeding over Yazd province during three months of February, March and April in 1999 has been evaluated using the historical regression method. Hereupon, the rain-gages in Yazd...In this research, the result of the cloud seeding over Yazd province during three months of February, March and April in 1999 has been evaluated using the historical regression method. Hereupon, the rain-gages in Yazd province as the target stations and the rain-gages of the neighboring provinces as the control stations have been selected. The rainfall averages for the three aforementioned months through 25 years (1973-1997) in all control and target stations have been calculated. In the next step, the correlations between the rainfalls of control and target stations have been estimated about 75%, which indicates a good consistency in order to use the historical regression. Then, through the obtained liner correlation equation between the control and target stations the precipitation amount for February, March and April in 1999, over the target region (Yazd province) was estimated about 27.57 mm, whiles the observed amount was 34.23 mm. In fact the precipitation increasing around 19.5% over Yazd province confirmed the success of this cloud seeding project.展开更多
The rice compound seedling raising machine is developed according to the request for the rice project seeding plant technology. The principle of the transmission system of the rice compound seedling raising machine a...The rice compound seedling raising machine is developed according to the request for the rice project seeding plant technology. The principle of the transmission system of the rice compound seedling raising machine and the seed feeding wheel working parameters are introduced. The tests of different structure and working parameters are made in the testing device of the new rice compound seedling raising machine, and the optimizing parameters for designing of seed feeding wheel are obtained.展开更多
文摘In this research, the result of the cloud seeding over Yazd province during three months of February, March and April in 1999 has been evaluated using the historical regression method. Hereupon, the rain-gages in Yazd province as the target stations and the rain-gages of the neighboring provinces as the control stations have been selected. The rainfall averages for the three aforementioned months through 25 years (1973-1997) in all control and target stations have been calculated. In the next step, the correlations between the rainfalls of control and target stations have been estimated about 75%, which indicates a good consistency in order to use the historical regression. Then, through the obtained liner correlation equation between the control and target stations the precipitation amount for February, March and April in 1999, over the target region (Yazd province) was estimated about 27.57 mm, whiles the observed amount was 34.23 mm. In fact the precipitation increasing around 19.5% over Yazd province confirmed the success of this cloud seeding project.
文摘The rice compound seedling raising machine is developed according to the request for the rice project seeding plant technology. The principle of the transmission system of the rice compound seedling raising machine and the seed feeding wheel working parameters are introduced. The tests of different structure and working parameters are made in the testing device of the new rice compound seedling raising machine, and the optimizing parameters for designing of seed feeding wheel are obtained.
