The University of Massachusetts Lowell is an urban public research university in Lowell, Massachusetts, United States, and part of the University of Massachusetts system. With more than 1,100 faculty members and nearly 17,000 students, it is the largest university in the Merrimack Valley and the second-largest public institution in the state behind UMass Amherst.The university offers 120 bachelor's, 39 master's and 33 doctoral degree programs, including nationally recognized programs in science, engineering and technology. Academically, UMass Lowell is organized into six schools and colleges: College of Fine Arts, Humanities and Social science; College of Health science; College of science; the Francis College of Engineering; the Graduate School of Education; and the Manning School of Business. Wikipedia.
Barlow M.,University of Massachusetts Lowell
Geophysical Research Letters | Year: 2011
Despite the catastrophic societal costs of hurricanes and considerable recent attention to possible trends, little is known about the general contribution of hurricane-related activity to extreme precipitation over North America and the underlying dynamics. Here, a 25-year observational analysis of daily data shows important contributions to extreme events over large regions of North America, including a pronounced signal over northern and inland areas, with an average span of influence extending to several hundred kilometers. Over large areas of the Northeast, there are stations where more than two-thirds of all extreme events are linked to hurricane-related activity. Large-scale vertical velocity, maximum wind speed, and tropical/extratropical character are shown to be important factors in the strength and range of influence. Analysis of dynamical factors, including buoyancy, moisture availability, and lifting, show the largest changes in lifting, with rising motion typical of the deep tropics occurring over inland and northern latitudes. Copyright © 2011 by the American Geophysical Union.
Martin F.G.,University of Massachusetts Lowell
Communications of the ACM | Year: 2012
IN THE LAST decade, the Creative Commons philosophy of freely sharing information and the pervasiveness of the Internet have created many new opportunities for teaching and learning. MIT OpenCourseWare spearheaded the sharing of high-quality, university-level courses. While these materials were not originally designed for individuals engaged in self-study, approximately half of OCW's traffic is from these users. 6 Recently the use of learning management systems (LMSs), such as the proprietary Blackboard or open-source Moodle software, has become ubiquitous. © 2012 ACM.
Tucker K.L.,University of Massachusetts Lowell
American Journal of Clinical Nutrition | Year: 2014
Osteoporosis is a common chronic condition associated with progressive loss of bone mineral density (BMD) and compromised bone strength, with increasing risk of fracture over time. Vegetarian diets have been shown to contain lower amounts of calcium, vitamin D, vitamin B-12, protein, and n-3 (v-3) fatty acids, all of which have important roles in maintaining bone health. Although zinc intakes are not necessarily lower quantitatively, they are considerably less bioavailable in vegetarian diets, which suggests the need for even higher intakes to maintain adequate status. At the same time, healthy vegetarian diets tend to contain more of several protective nutrients, including magnesium, potassium, vitamin K, and antioxidant and anti-inflammatory phytonutrients. On balance, there is evidence that vegetarians, and particularly vegans, may be at greater risk of lower BMD and fracture. Attention to potential shortfall nutrients through the careful selection of foods or fortified foods or the use of supplements can help ensure healthy bone status to reduce fracture risk in individuals who adhere to vegetarian diets. © 2014 American Society for Nutrition.
Socia K.M.,University of Massachusetts Lowell
Crime and Delinquency | Year: 2012
Residence restrictions seek to protect community members from registered sex offenders (RSOs) reentering society following incarceration. These policies, first passed in 1995 at the state level and in 2005 at the county and local levels, have become extremely popular throughout the United States but without proof that they are effective. To date, the research on these policies has been extremely limited and has largely focused on the unintended consequences that these policies cause for RSOs. This study examines whether county residence restrictions were associated with reduced sex crime arrest rates in New York State. In doing so, this study draws on the limited prior research regarding the effectiveness of residence restrictions and on the extensive literature regarding the incapacitation and deterrence of crime through public policy measures. Results indicate that residence restrictions were not associated with significantly reduced arrests for sex crimes committed either by RSOs (regardless of victim) or by non-RSOs against child victims. However, results suggested that these policies may be associated with a general deterrence effect, resulting in a decrease of sex crimes against adults by first-time sex offenders (non-RSOs). Implications for future research and policy making are discussed. © The Author(s) 2012.
Hu T.,University of Massachusetts Lowell
IEEE Transactions on Power Electronics | Year: 2011
Power-electronic converters are intrinsically nonlinear. This paper proposes a Lyapunov approach to analysis and design of a class of nonlinear systems arising from power-electronic converters. The system has a bilinear term as the product of the state and the input - the duty cycle, which is subject to strict constraint (or saturation). The nonlinearities and the input saturation are considered in this paper by using piecewise-quadratic Lyapunov functions and by describing the system with a piecewise-linear differential inclusion. The problems considered include controller design for robust stability, and estimation of stability region and tracking domain. These analysis and design problems are converted into numerically efficient optimization algorithms involving linear-matrix inequalities (LMIs). A buck-boost dc-dc converter is used to demonstrate the proposed methods. The optimization results show that a simple state-feedback law can be constructed to achieve practically global stabilization and tracking, which is theoretically confirmed by the Lyapunov approach. An experimental buck-boost converter is constructed to verify the tracking of a square reference varying almost between the upper and the lower limit. © 2006 IEEE.