An introductory method for clarinet

Thesis (M.A.)--Boston University, 1947. This item was digitized by the Internet Archive

Molecule sublimation as a tracer of protostellar accretion: Evidence for accretion bursts from high angular resolution C18O images

The accretion histories of embedded protostars are an integral part of descriptions of their physical and chemical evolution. In particular, are the accretion rates smoothly declining from the earlier toward later stages or in fact characterized by variations such as intermittent bursts? We aim to characterize the impact of possible accretion variations in a sample of embedded protostars by measuring the size of the inner regions of their envelopes where CO is sublimated and relate those to their temperature profiles dictated by their current luminosities. Using observations from the Submillimeter Array we measure the extents of the emission from the C18O isotopologue toward 16 deeply embedded protostars. We compare these measurements to the predicted extent of the emission given the current luminosities of the sources through dust and line radiative transfer calculations. Eight out of sixteen sources show more extended C18O emission than predicted by the models. The modeling shows that the likely culprit for these signatures is sublimation due to increases in luminosities of the sources by about a factor five or more during the recent 10,000 years - the time it takes for CO to freeze-out again on dust grains. For four of those sources the increase would have had to have been a factor 10 or more. The compact emission seen toward the other half of the sample suggests that C18O only sublimates when the temperature exceeds 30 K - as one would expect if CO is mixed with H2O in the grain ice-mantles. The small-number statistics from this survey suggest that protostars undergo significant bursts about once every 20,000 years. This also illustrates the importance of taking the physical evolutionary histories into account for descriptions of the chemical structures of embedded protostars.Comment: Accepted by A&A; 11 pages, 5 figure

Recovery of endurance running capacity: effect of carbohydrate-protein mixtures

Including protein in a carbohydrate solution may accelerate both the rate of glycogen storage and the restoration of exercise capacity following prolonged activity. Two studies were undertaken with nine active men in study A and seven in study B. All participants performed 2 trials, each involving a 90 min run at 70% VO2max followed by a 4 h recovery. During recovery, either a 9.3% carbohydrate solution (CHO) or the same solution plus 1.5% protein (CHO-PRO) was ingested every 30 min in volumes providing either 1.2 g CHO · kg-1 · h-1 (study A) or 0.8 g CHO · kg-1 · h-1 (study B). Exercise capacity was then assessed by run time to exhaustion at 85% VO2max. Ingestion of CHO-PRO elicited greater insulinemic responses than CHO (P less than or equal to 0.05) but with no differences in run times to exhaustion. Within the context of this experimental design, CHO and CHO-PRO restored running capacity with equal effect

Adapting the International System of Units to the twenty-first century

We review the proposal of the International Committee for Weights and Measures (Comité International des Poids et Mesures, CIPM), currently being considered by the General Conference on Weights and Measures (Conférences Générales des Poids et Mesures, CGPM), to revise the International System of Units (Le Système International d’Unitès, SI). The proposal includes new definitions for four of the seven base units of the SI, and a new form of words to present the definitions of all the units. The objective of the proposed changes is to adopt definitions referenced to constants of nature, taken in the widest sense, so that the definitions may be based on what are believed to be true invariants. In particular, whereas in the current SI the kilogram, ampere, kelvin and mole are linked to exact numerical values of the mass of the international prototype of the kilogram, the magnetic constant (permeability of vacuum), the triple-point temperature of water and the molar mass of carbon-12, respectively, in the new SI these units are linked to exact numerical values of the Planck constant, the elementary charge, the Boltzmann constant and the Avogadro constant, respectively. The new wording used expresses the definitions in a simple and unambiguous manner without the need for the distinction between base and derived units. The importance of relations among the fundamental constants to the definitions, and the importance of establishing a mise en pratique for the realization of each definition, are also discussed

Uncompromising Hunger for Justice: Resistance, Sacrifice, and LatCrit Theory

In this Article, three law professors report on and theorize a nonviolent direct-action campaign of the kind discussed by Dr. King in his famous Letter from a Birmingham Jail. Using the basic steps of the nonviolent campaign as an organizing framework, they analyze and report on the 18-day hunger strike by the Frisco 5 (a.k.a., Frisco5). This direct action protested the extrajudicial killings of Amilcar Perez-Lopez, Alex Nieto, Luis Góngora-Pat, and Mario Woods by San Francisco Police Department (SFPD) officers and advocated for institutional change to reduce the risk of homicides against persons with similarly racialized minority-group identities. Two weeks after the Frisco 5’s 18-day hunger strike ended, San Francisco Mayor Ed Lee called for the resignation of SFPD Chief Greg Suhr. Before firing Chief Suhr, however, Mayor Ed Lee sought to subdue the pressure he felt as the result of the hunger strike by making a shallow peace offering of $17.5 million dollars towards police reform and violence prevention. First, Brenda Williams uses personal narrative to introduce and overview the Frisco 5 hunger strike, contrasting this direct action with how legal education often accedes to the racial inequities endemic to the criminal justice system of the United States. She asks, where does the hunger strike, as a tool for justice, fit into legal discourse? How does the hunger strike resist dominant legal paradigms that constrain a lawyer’s justice work to the courtroom rather than promote justice work by lawyers in collaboration with community members in the streets of the Mission District in San Francisco? Next, Edwin Lindo reports and reflects on his experience participating in the hunger strike as one of the Frisco 5. Also, he charts a partial history of hunger strikes and their legal significance. Finally, Marc-Tizoc González theorizes the Frisco 5 hunger strike within critical race theory (CRT) and Latina and Latino Critical Legal theory (LatCrit theory). He applies critical concepts and practices like counterstorytelling and testimonio, evokes the critical ethnic legal history de la comunidad Latina/o/x (of the Latina/o/x community), and briefly discusses the political and religious significance of people’s public uses of food under First Amendment freedoms (i.e., free exercise of religion, free speech, petition of government for redress, and peaceable assembly). He concludes by asserting that the Frisco 5 acted within a genealogy of struggle—a fictive kinship of people who have fasted individually and collectively, inside and outside of prison, to protest injustice and to advocate for institutional reform, within historically contingent socio-legal relations of power