The Transportation Dividend: Transit Investments and the Massachusetts Economy

As home to America's first subway, Boston has been a transit-oriented city for more than a century. In fact, much of our regional economic success is due to the connectivity that a transit system provides. It is no coincidence that the area served by the MBTA houses almost 70 percent of the state's population, offers 74 percent of the jobs, and generates 84 percent of Massachusetts's gross domestic product. The MBTA is the backbone of our economy and any successful strategy for continued growth and prosperity for the region must begin with smart investment in this system.Luckily, the calculus is straightforward as the benefits from our transit system far outweigh the costs we dedicate to support it. A new report from A Better City, made possible through support from both the Barr Foundation and The Boston Foundation, measured the MBTA's performance and economic impact. It found that through travel time and cost savings, vehicular crashes avoided and reduced auto emissions, the MBTA provides an estimated $11.4 billion in value to Greater Boston each year for both transit users and non-users alike. Boston residents experience all of these benefits from the T's annual operating budget of approximately$2 billion.The report also considered the alternative, examining what would it cost if our transit system did not exist. Our economy would require the capital cost of nearly 2,300 additional lane miles of roads and 400,000 more parking spaces. If we needed to build that today, the cost for this vehicular infrastructure would be over $15 billion. The MBTA is a bargain today and for the future

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Social Conflict, Cultural Cleavage, and Political Change: a Contextual Analysis of the 1972 Presidential Election.

Ph.D.Political scienceUniversity of Michiganhttp://deepblue.lib.umich.edu/bitstream/2027.42/157381/1/7510265.pd