We consider profit-maximization problems for combinatorial auctions with non-single minded valuation functions and limited supply. We obtain fairly general results that relate the approximability of the profit-maximization problem to that of the corresponding social-welfare-maximization (SWM) problem, which is the problem of finding an allocation (S1, . . . , Sn) satisfying the capacity constra...

A reliable dynamic simulator (based on a sound process model) is highly desirable for optimizing the performance of individual membrane modules and of entire desalination plants. This paper reports on progress toward development of a comprehensive model of the complicated physical-chemical processes occurring in spiral wound membrane (SWM) modules, that accounts for the...

The economic growth and demographic changes in Indian cities are posing a serious challenge to urban local authorities. By the year 2020, Indian urban centers including Bangalore will witness a huge increase in population. With the rapidly growing urban population, the need for infrastructure services increases manifold. The increase in per capita income and the concomitant industrial and servi...

Like most developing countries, Zambia has been going through very difficult times economically. This has seriously affected the capacity of various government agencies to provide public services. As a result the government and its agencies have over the past decade been forced to reassess the way in which publicly provided urban services are delivered. The key policy response has been a moveme...

Abstract Universiti Tun Hussein Onn Malaysia (UTHM) laboratory is the major source of scheduled waste (SW) production which impacts human health and environment if it not well-managed. Therefore, management SW involves serious cooperation from all generators (SWG), students to both academic non-academic staff in an educational institution. The purpose research understand current status SWG’s kn...

The monsoon circulation in the Northern Indian Ocean (NIO) is unique since it develops response to bi-annual reversing monsoonal winds, with ocean currents mirroring this change through directionality and intensity. interaction between topographic features have implications for development of Island Mass Effect (IME) NIO. IME NIO characterized by areas high chlorophyll concentrations identified...

In many low and middle-income countries, solid waste management (SWM) systems remain weak lack standardization. Moreover, these fail to account for citizen’s insight on the proposed initiatives. This study aims identify main determinants of SWM practices in a low-middle income country while accounting citizens’ perceived knowledge, attitudes, structural barriers, willingness pay different servi...

In recent years, rainfall extremes have increased significantly and threatened the socio-economic development in Sri Lanka. This study investigates Mahaweli River Basin (MRB) of Lanka with daily station datasets from 1985 to 2015. The extreme indices recommended by Expert Team on Climate Change Detection Monitoring Indices (ETCCDMI) been used this study. Results showed a strong seasonal variati...