Intermonthly Difference of Multi-attribute Characteristics of Rainstorm in China Based on Spatial-temporal Differentiation

Based on the daily precipitation data of 545 meteorological stations in China from 1961 to 2016, the spatial-temporal variation characteristics of rainstorm rainfall and rainy days in different months of China were diagnosed from three aspects: climatic characteristics, variation trend and interannual variation. The results showed that:(1) Rainstorm rainfall and rainy days in different months of China from 1961 to 2016 had similar spatial characteristics in corresponding months. From January to July, the high-value areas of rainstorm rainfall and rainy days gradually expanded from southeast coast to northwest inland, but mainly distributed in the east area of Hu Huanyong Line. From August to December, it shrank from northwest to southeast coastal areas. Rainstorm rainfall and rainy days were less distributed in different months in the west area of Hu Huanyong Line;(2) From 1961 to 2016, the spatial-temporal variation characteristics of rainstorm rainfall in different months in China were basically consistent with that of rainy days. May to August was the most significant month for the variation trend of rainstorm rainfall and rainy days in China. It mainly distributed in the southeast monsoon area, and was mainly increasing trend. The trend of rainstorm rainfall and rainy days in northwest China changed slightly in different months;(3) The interannual variability of rainstorm rainfall in different months in China from 1961 to 2016 was similar to that of rainy days. The fluctuation characteristics from April to October were larger in the northern region. The southern region fluctuated greatly from November to December in January to March. With the development of the month, the high-value areas with large daily fluctuations of rainstorm rainfall and rainy days gradually expanded from southeast to northwest, northeast and southwest, and the fluctuations in southeast tended to decrease, then shrank from northwest, northeast and southwest to southeast, with the increasing fluctuations in southeast. The study has certain reference significance for flood control and disaster reduction and water resources planning and utilization.

Reflections on China’s Targeted Poverty Alleviation Strategy from the Perspective of Drawing on Advantages and Avoiding Disadvantages in the New Era

The new era has put forward new requirements for targeted poverty alleviation.Coordinating disaster prevention,mitigation and relief and ecological civilization construction to assist targeted poverty alleviation has become an important direction for alleviating poverty from the perspective of drawing on advantages and avoiding disadvantages.The Outline of the 13th Five-Year Plan for National Economic and Social Development of the People's Republic of China has planned and deployed to fully implement the task of poverty alleviation.The current poverty alleviation is extending from fixed-point poverty alleviation to collaborative poverty alleviation and targeted poverty alleviation.Combining the needs of disaster response,climate adaptation,resource utilization,ecological construction,and information utilization in poverty-stricken areas,the role of disaster risk monitoring,forecasting and early warning services is displayed.The disaster prevention,mitigation and relief and poverty alleviation in the new era should be integrated into the national poverty alleviation pattern,actively serve poverty alleviation projects of industry development,relocation and ecological protection,deeply explore the value of disaster risk information and improve the effective supply of disaster prevention,mitigation and relief services,letting disaster prevention,mitigation and relief and ecological civilization construction help the implementation of targeted poverty alleviation.

Improvement and Design of Transmitter Modifier Wind Cooling Protection for CINRAD/CB Weather Radar

Doppler weather radar has important applications in measuring the intrinsic factors of cloud, rainfall and various convective weather occurrences. Among them, CINRAD/CB Doppler weather radar is based on the requirements of the China Meteorological Administration and many units have been provided. The modulator is a critical part of the transmitter’s high voltage, where high voltage, high current, and energy conversion are concentrated. It is therefore necessary to redesign the transmitter modulator cooling system protection. This article describes the new design of hardware and software solutions. The fan is a DV5214/2N DC fan from Ebmpapst, Germany. The speed is up to 5000 rpm, the power is 18.5 W, and the single fan current is about 0.8 A. It is powered by 28 V. The protection board uses a DC/DC module to output a 5 V voltage and a 3.3 V voltage adjustment chip LM1117. The embedded web software is based on the TCP/IP protocol stack provided by MICROCHIP. After the cooling system is designed and installed in the radar station in Xi’an, China and other places, after long-term operation, the comprehensive test shows that the system runs well.