Create jobs in cleaning up the environment

Phytoremediation: Cleaning up the Environment by Plants

Anthropogenic activities cause pollution of soil, groundwater, sediments, surface water, air with unsafe and noxious chemicals is one of the main crises facing the industrialized world today. Over the last century, public apprehension about environmental pollution has increased remarkably. Now a days, polluted soils and waters as a result of global industrialization pose a major environmental a...

Swimmer, Protect Thyself: Cleaning Up the Pool Environment

Do Some Enterprise Zones Create Jobs?

We study how the employment effects of enterprise zones vary with their location, implementation, and administration, based on evidence from California. We use new establishment-level data and geographic mapping methods, coupled with a survey of enterprise zone administrators. Overall, the evidence indicates that enterprise zones do not increase employment. However, the evidence also suggests t...

Cleaning up the Tower: Numbers in Scheme

The R5RS specification of numerical operations leads to unportable and intransparent behavior of programs. Specifically, the notion of “exact/inexact numbers” and the misleading distinction between “real” and “rational” numbers are two primary sources of confusion. Consequently, the way R5RS organizes numbers is significantly less useful than it could be. Based on this diagnosis, we propose to ...

Cleaning up after yourself

Performing cleanup actions such as restoring a variable or closing a file used to be impossible to guarantee in Forth before Forth-94 gave us catch. Even with catch, the cleanup code can be skipped due to user interrupts if you are unlucky. We introduce a construct that guarantees that the cleanup code is always completed. We also discuss a cheaper implementation approach for cleanup code than ...