• Widespread soil erosion occurred in the hilly-gully region of Loess Plateau. Reclamation and deforestation 1950–1970s caused severe erosion. The increased vegetation coverage since 1990s efficiently reduced Restoring forest is more appropriated measure for mitigation. Convex micro-topography mitigate loss sloping fields. Soil strongly threatens sustainability natural ecosystems over world, es...

Resonators serve as essential components in radio-frequency (RF) electronics, forming the backbone of filters and tuned amplifiers. However, traditional solid state or mechanic implementations of resonators and filters tend to be bulky and power hungry, limiting the versatility of communications, guidance, and avionics systems. Microelectro-mechanical systems (MEMS) are promising replacements f...

The Aggregate Demand – Aggregate Supply framework has dominated intermediate macroeconomics textbooks since the 1980s. However, there have been 2007). In spite of these criticisms, the ADAS framework had continued to dominate the textbooks, with little or no response to these criticisms. This paper reviews the main criticisms of the ADAS framework, and then focuses on Gregory Mankiw's presentat...

In this paper we will analyze how retirement behavior is affected by a worker’s firm-specific or general training history. This relationship is studied in the perspective of upward sloping earning profiles. Moreover, we examine the effects of technological change on the likelihood of early retirement. Using U.S. data from the National Longitudinal Survey of Older Men, we find that workers with ...

Soil moisture is an important state variable in the hydrologic cycle, and its spatiotemporal distribution depends on many geophysical processes operating at different spatial and temporal scales. To achieve a better accounting of the water and energy budgets at the land-atmosphere boundary, it is necessary to better understand the spatiotemporal variability of soil moisture under different hydr...