DEFINITION of 'Human Development Index-HDI'. A tool developed by the United Nations to measure and rank countries' levels of social and economic development based on four criteria: Life expectancy at birth, mean years of schooling, expected years of schooling and gross national income per capita.EFINITION of 'Human Development Index-HDI'. A tool developed by the United Nations to measure and rank countries' levels of social and economic development based on four criteria: Life expectancy at birth, mean years of schooling, expected years of schooling and gross national income per capita.
A top and bottom gear rack are moving in the same direction but with different velocities (top rack 5 m/s and bottom rack 3 m/s). What is the angular velocity of the small attached gear B at the instant shown? Assume the top rack, bottom rack, and link AB remain horizontal.
Basic characteristics. Narrow aisle racking systems are a major alternative to multi-bay racking systems. They offer all the performance features of multi-bay racking at heights above 10 m and are freestanding in the warehouse. They are characterised by the small amount of floor space required for aisles and the extremely large lift heights. Narrow aisle racking is used in particular when a) there is only limited space available and b) there is a necessity for greater throughput in comparison with multi-bay racking systems.