Design and manufacturing of a Selective Laser Sintering test bench to test sintering materials

The goal of this project is to design and build a prototype of recoating system for a laser cutting machine to turn it into a selective laser sintering printing machine. This prototype will be used to study new sintering materials and to design, if decided, a SLS 3D printing Machine (Selective Laser Sintering). This project has been developed in the installations and funded by Fundació CIM. The project develops the mechanical design and the electronic system design. Both parts are explained on this paper, so new users can use the machine and can understand the system. With this paper, it is expected that it can be improved in a future to test other parameters and configurations. The paper is divided in three basic blocks that are summed up here: The first block is an introduction to the 3D printing technologies. The most used of them are explained and selective laser sintering is explained in deep. With this block the reader can understand why it is important to develop the SLS technology and what has to be done to improve the machines and the technology. The second block is a discussion on the mechanical design of the machine. The general idea of the machine is explained so the user can understand why the machine is designed in this way. After that, each part is detailed to see how the different mechanical challenges where overtaken. At the end of the block, there is a small calculations section needed on the electronic part. The third block is an extensive explanation of the electronic system that controls and moves the machine. In that block, the different components are explained so the user can understand its basics working principles. It is also explained how the selection of the electronic components was done. Then everything is put together to see the whole electronic system. Along with this paper, there are annexes that provide some extra information for the reader. One of this annexes refers to the mechanical part and the other one has some datasheets and coding for the electronic section. The whole design has been done in SOLIDWORKS cad software and its electric extension ELECWORKS. The programming job was done with Arduino compiler

From Grutter to Fisher: Is Justice Sandra Day O’Connor’s Legacy in Danger?

[Excerpt] “This paper explores the impact of Justice O’Connor on the Court’s race and education jurisprudence, both in the context of primary through secondary school education and in public universities. Section II outlines Justice O’Connor’s biography and explores several external influences on the Justice. Section III reviews the Court’s race and education jurisprudence prior to Justice O’Connor’s appointment to the Court. Section IV exposes the Court’s jurisprudence in this area during Justice O’Connor’s time on the Court, with an emphasis on those opinions authored by Justice O’Connor. Section V offers an analysis of the aftermath of Justice O’Connor’s race and education jurisprudence, beginning with Section V(A) addressing the state of the law after Justice O’Connor’s majority opinion in Grutter v. Bollinger. Section V(B) discusses the Court’s race and education jurisprudence following Justice O’Connor’s tenure, primarily through an analysis of Parents Involved in Community Schools. Finally, Section V(C) hypothesizes the future of race-conscious decision-making in education and Justice O’Connor’s legacy through the lens of Fisher v. University of Texas at Austin. Section VI concludes this paper.

Volume 2, Number 1 - May 1956

The Entropy (also published as the Providence College Journal of Physics and Chemistry) was an undergraduate scholarship journal published by the Phi Chi Club of Providence College. (Volume 2, Number 1 - May 1956 - 16 pages in total.

Clarett v. National Football League: Defining the Non-Statutory Labor Exception to Antitrust Law as it pertains to Restraints primarily focused in Labor Markets and Restraints primarily focused in Business Markets

[Excerpt] “Contemporary sports have seen an influx of young talent opting for a chance at playing in the big leagues earlier at the expense of obtaining higher education. Many dream of playing professional sports—dreams often prohibited by player eligibility rules. In situations where the restraints are not argued to have been protected by non-statutory labor exception, antitrust law has been seen to set its talons into eligibility rules. […] Federal antitrust law and national labor law set forth two conflicting policies that have created a periodic drama for sports fans concerned that their favorite sports will suffer a cataclysmic court room battle impairing the quality of the game. The Supreme Court interpreted federal antitrust and labor law to implicitly exclude antitrust liability for certain collective bargaining labor related activities under the non-statutory labor exception to antitrust law. This absence of explicit guidance has led to a split in the circuits where courts have formulated their own interpretations of these colliding national policies. In 1996, the Supreme Court in Brown v. Pro Football, Inc., attempted to further clarify the scope of this exemption and ultimately held that national antitrust and labor policies favored the application of the exception when the alleged restraints were in labor markets defined by collective bargaining. In 2004, the United States Court of Appeals for the Second Circuit held in Clarett v. National Football League4 that Brown reaffirmed the Second Circuit position that restraints resulting from the collective bargaining process and primarily impacting the labor market were subject to the non-statutory labor exception to antitrust law. […] This note will analyze the Second Circuit’s ruling and rationale in light of the relevant governing law and national policies between antitrust law and labor law. Part II will discuss the general trend of player-raised antitrust challenges to restraint cases in professional sports, setting the stage for an aspiring football player like Clarett to challenge the NFL Eligibility Rules. In Part III, this note will discuss the facts, procedural history and outcome of Clarett. Part IV will discuss the historical background under which Clarett was ruled. Part V will analyze how courts have distinguished between restraints created through the collective bargaining process which primarily impact the labor market as opposed to those that primarily impact business markets. In Part VI, this note will analyze Clarett’s interpretation of Brown in distinguishing labor and business markets, and discuss how the non-statutory labor exception should be applied to labor market restraints as compared to business market restraints. Finally, it will outline the legacy that Clarett provides for future player-raised challenges in similar situations.

The Daily Texan

Texas Student Medi

Wiring Viterbi decoders (splitting deBruijn graphs)

A new Viterbi decoder, capable of decoding convolutional codes with constraint lengths up to 15, is under development for the Deep Space Network (DSN). A key feature of this decoder is a two-level partitioning of the Viterbi state diagram into identical subgraphs. The larger subgraphs correspond to circuit boards, while the smaller subgraphs correspond to Very Large Scale Integration (VLSI) chips. The full decoder is built from identical boards, which in turn are built from identical chips. The resulting system is modular and hierarchical. The decoder is easy to implement, test, and repair because it uses a single VLSI chip design and a single board design. The partitioning is completely general in the sense that an appropriate number of boards or chips may be wired together to implement a Viterbi decoder of any size greater than or equal to the size of the module