Determination of the absorption length of CO2, Nd:YAG and high power diode laser radiation for a selected grouting material

The laser beam absorption lengths of CO2, Nd:YAG and a high power diode laser (HPDL) radiation for a newly developed SiO2/Al2O3-based tile grout have been determined through the application of Beer-Lambert’s law. The findings revealed marked differences in the absorption lengths despite the material having similar beam absorption coefficients for the lasers. The absorption lengths for the SiO2/Al2O3-based tile grout for CO2, Nd:YAG and HPDL radiation were calculated as being 23211 m, 1934 m and 1838 m respectively. Moreover, this method of laser beam absorption length determination, which has hitherto been used predominantly with lasers operated in the pulsed mode, is shown to be valid for use with lasers operated in the continuous wave (CW) mode, depending upon the material being treated

Augmentation of the mechanical and chemical resistance characteristics of an Al2O3-based refractory by means of high power diode laser surface treatment

Augmentation of the wear rate and wear life characteristics of an Al2O3-based refractory within both normal and corrosive (NaOH and HNO3) environmental conditions was effected by means of high power diode laser (HPDL) surface treatment. Life assessment testing revealed that the HPDL generated glaze increased the wear life of the Al2O3-based refractory by 1.27 to 13.44 times depending upon the environmental conditions. Such improvements are attributed to the fact that after laser treatment, the microstructure of the Al2O3-based refractory was altered from a porous, randomly ordered structure, to a much more dense and consolidated structure that contained fewer cracks and porosities. In a world economy that is increasingly placing more importance on material conservation, a technique of this kind for delaying the unavoidable erosion (wear) and corrosion that materials such as the Al2O3-based refractory must face may provide an economically attractive option for contemporary engineers

Front Park\u27s Past and Future

Front Park is a 26-acre urban park in Buffalo, New York. The park entrance is located on Porter Avenue. The park is bounded on the west by interstate 190, on the north by the Peace Bridge truck plaza and on the north by Busti Avenue and the adjacent Columbus Park-Prospect Hill neighborhood. Front Park is part of Buffalo’s Olmsted park system. The park system takes its name from its most prominent original designer, Frederick Law Olmsted Sr., a nationally renowned landscape architect who along with his partner, Calvert Vaux, designed parks and park systems across the country, including New York City’s Central Park. Olmsted’s work in New York City garnered the attention of prominent Buffalonians, who hired him to design a park system in 1868. Buffalo’s Olmsted park system was designed over a nearly 50-year period, from 1869 to 1915

Judicial Specialization and the Adjudication of Immigration Cases

When scholars and policymakers consider proposals for specialized courts, they are usually and appropriately mindful of the potential effects of specialization on the adjudication of cases. Focusing on the immigration field, this Article considers these potential effects in relation to other attributes of adjudication: the difficulty of cases, the severe caseload pressures, and the strong hierarchical controls that are each important attributes at some or all levels of the adjudication system. Specifically, this Article discusses the effects of those attributes, the effects of judicial specialization, and the intertwining of the two. It applies that analysis to proposals to substitute some type of specialized court for the federal courts of appeals in the adjudication of immigration cases. The Article concludes that the impact of adopting such a proposal could be substantial but that it is also quite uncertain. To a considerable degree, the impact depends on the form of specialization adopted and on other provisions of the legislation that creates a specialized court

Accelerating Nearest Neighbor Search on Manycore Systems

We develop methods for accelerating metric similarity search that are effective on modern hardware. Our algorithms factor into easily parallelizable components, making them simple to deploy and efficient on multicore CPUs and GPUs. Despite the simple structure of our algorithms, their search performance is provably sublinear in the size of the database, with a factor dependent only on its intrinsic dimensionality. We demonstrate that our methods provide substantial speedups on a range of datasets and hardware platforms. In particular, we present results on a 48-core server machine, on graphics hardware, and on a multicore desktop

Corrupt and Unequal, Both

Rick Hasen has presented the issue of money in politics as if we have to make a choice: it is either a problem of equality or it is a problem of corruption. Hasen’s long and influential career in this field has been a long and patient struggle to convince those on the corruption side of the fight (we liberals, at least, and, in an important sense, we egalitarians too) to resist the temptation to try to pass—by rendering equality arguments as corruption arguments, and to just come out of the closet. Hasen had famously declared that the corruption argument supporting Austin v. Michigan Chamber of Commerce was a fake and that the only basis for justifying the ban on corporate spending in Austin was equality, not corruption. And the U.S. Supreme Court famously (in our circles at least) agreed, in the process of striking down the ban on corporate spending in Austin and everywhere else. Thus, Hasen argues, it is a fool’s errand to fake the corruption argument. We need instead, Hasen has constantly counseled, a bit of egalitarian pride. Be true to ourselves, Hasen tells us, and give up the pretense of corruption talk

On the universal sl_2 invariant of ribbon bottom tangles

A bottom tangle is a tangle in a cube consisting of arc components whose boundary points are on a line in the bottom square of the cube. A ribbon bottom tangle is a bottom tangle whose closure is a ribbon link. For every n-component ribbon bottom tangle T, we prove that the universal invariant J_T of T associated to the quantized enveloping algebra U_h(sl_2) of the Lie algebra sl_2 is contained in a certain Z[q,q^{-1}]-subalgebra of the n-fold completed tensor power of U_h(sl_2). This result is applied to the colored Jones polynomial of ribbon links

SACU tariff policies: Where should they go from here?

This paper characterizes the current SACU tariff structure, considers its rationale, proposes and evaluates some alternatives and offers some suggestions for reforming the SACU revenue sharing formula and regional trade strategy. While considerable progress was made until recently in liberalizing and simplifying SACU’s tariff structure, over the past few years such movement appears to have halted. This is unfortunate because, as the paper demonstrates, the tariff structure remains excessively complex, and opaque, continues to taxes exports and provides sectors with very disparate amounts of protection. The differentiation appears mainly to be the result of historical accident and does not appear to be justifiable as efficient job preservation, equitable income distribution or on infant industry grounds. Several alternative tariff structures that use just one or two tariff bands are explored. We demonstrate that it is possible simultaneously to provide benefits to consumers, limit employment dislocation, confer a reasonable degree of effective protection, particularly on finished goods, reduce export taxes, improve transparency and provide a norm against which industrial policy priorities can be set. A major reform of SACU tariffs would also provide the opportunity to renegotiate the SACU revenue-sharing formula, more clearly and rationally separating its aid and tariff-revenue sharing components. The paper also advocates that SACU place primary reliance on free trade agreements rather than new customs unions in its dealing with other trading partners.Trade policy; South African Customs Union; Liberalisation

Measuring Responses to Commercials: A Projective-Elicitation Approach

Photoelicitation and projective assessment are research methods derived from visual sociology and psychoanalysis respectively. This study combined the methods by having respondents view a commercial, and then showing them one of two versions of a projective drawing showing a lone or a male-accompanied woman sitting on a couch. Respondents were told that the woman in the drawing had just seen the commercial and were asked about what the woman was thinking. The results show that a paper-and-pencil attitude measure correlated moderately with the visually-primed responses, but the visually-primed responses included psychoanalytically-predicted reactions such as denial and displacement and were dependent upon the social situation depicted in the drawing