Interplay Between Inhibited Transport and Reaction in Nanoporous Materials

This work presents a detailed formulation of reaction and diffusion dynamics of molecules in confined pores such as mesoporous silica and zeolites. A general reaction-diffusion model and discrete Monte Carlo simulations are presented. Both transient and steady state behavior is covered. Failure of previous mean-field models for these systems is explained and discussed. A coarse-grained, generalized hydrodynamic model is developed that accurately captures the interplay between reaction and restricted transport in these systems. This method incorporates the non-uniform chemical diffusion behavior present in finite pores with multi-component diffusion. Two methods of calculating these diffusion values are developed: a random walk based approach and a driven diffusion model based on an extension of Fick\u27s law. The effects of reaction, diffusion, pore length, and catalytic site distribution are investigated. In addition to strictly single file motion, quasi-single file diffusion is incorporated into the model to match a range of experimental systems. The connection between these experimental systems and model parameters is made through Langevin dynamics modeling of particles in confined pores

International contracts a quantitative analysis of transnational contract formation

Globalization is the promise of the future, and it presents, quite literally, a world of opportunities not available in the past. International collaborations in science, research, and business now enjoy increased probabilities of success, in part, because of the advance in technology and the possibility of instantaneous communications. The convenience, simplicity and affordability of technology are helping to make the world accessible to almost everyone. With new availability of international concerns and the growth of global partnerships in all areas of interest, an increased need arises for agreements that memorialize collaborators\u27 commitments, responsibilities and obligations. There is a corresponding concern that the agreements be enforceable across national and international lines should anything go wrong. There is no collaboration, partnership or venture that will not be touched in some way by the law. Whose law governs and how rules and regulations of different nations will be applied are of escalating concern. Empirically examining the state of international contract law is the overarching focus of my research. Adopting a research methodology involving both quantitative and qualitative techniques, I am investigating whether any consistency exists between attorneys of different practice sectors (academic, government, corporate and private) considering choice of law, enforcement of contract provisions, and the inclusion of preventative measures of international contracts. My results contribute to the future success of international collaborations of all concerns by empirically identifying the need for increased education on various dispute resolution options, as well as the effect cultural awareness has on the drafting of international contracts

A finite element approach to self-consistent field theory calculations of multiblock polymers

Self-consistent field theory (SCFT) has proven to be a powerful tool for modeling equilibrium microstructures of soft materials, particularly for multiblock polymers. A very successful approach to numerically solving the SCFT set of equations is based on using a spectral approach. While widely successful, this approach has limitations especially in the context of current technologically relevant applications. These limitations include non-trivial approaches for modeling complex geometries, difficulties in extending to non-periodic domains, as well as non-trivial extensions for spatial adaptivity. As a viable alternative to spectral schemes, we develop a finite element formulation of the SCFT paradigm for calculating equilibrium polymer morphologies. We discuss the formulation and address implementation challenges that ensure accuracy and efficiency. We explore higher order chain contour steppers that are efficiently implemented with Richardson Extrapolation. This approach is highly scalable and suitable for systems with arbitrary shapes. We show spatial and temporal convergence and illustrate scaling on up to 2048 cores. Finally, we illustrate confinement effects for selected complex geometries. This has implications for materials design for nanoscale applications where dimensions are such that equilibrium morphologies dramatically differ from the bulk phases

Thomas Jefferson Counts Himself into the Presidency

The Constitution instructs the President of the Senate to open the ballots submitted by members of the Electoral College, but it provides little guidance when a ballot turns out to be defective. This article provides the first in-depth consideration of two early precedents. Both Vice-President John Adams and Vice-President Thomas Jefferson confronted problems when counting the electoral votes in 1797 and 1801, respectively. Both men were placed in the awkward position of ruling on matters involving an election in which they were leading presidential candidates, but Jefferson\u27s problem was more serious. In 1801, Georgia\u27s electors cast their votes for Jefferson and Burr, but their ballots were in plain violation of the Constitution\u27s explicit formal requirements. If Jefferson had ruled these votes invalid in his capacity as Senate President, one of the Federalist candidates, Adams or Pinckney, might well have emerged victorious from the House runoff required under the Constitution. But Jefferson used his authority as Senate President to exclude his Federalist competitors, restricting the runoff to a two-man race between himself and Aaron Burr. This allowed him to emerge victorious on the thirty-sixth ballot. Rumors of this episode occasionally surfaced during the nineteenth century, but this article presents indisputable documentary evidence demonstrating the irregularity of the Georgia ballot. After telling the story, we appraise its significance both as an act of constitutional statesmanship and as an enduring legal precedent that may guide future Senate Presidents as they confront the electoral college crises of the twenty-first century

Thomas Jefferson Counts Himself into the Presidency

The Constitution instructs the President of the Senate to open the ballots submitted by members of the Electoral College, but it provides little guidance when a ballot turns out to be defective. This article provides the first in-depth consideration of two early precedents. Both Vice-President John Adams and Vice-President Thomas Jefferson confronted problems when counting the electoral votes in 1797 and 1801, respectively. Both men were placed in the awkward position of ruling on matters involving an election in which they were leading presidential candidates, but Jefferson\u27s problem was more serious. In 1801, Georgia\u27s electors cast their votes for Jefferson and Burr, but their ballots were in plain violation of the Constitution\u27s explicit formal requirements. If Jefferson had ruled these votes invalid in his capacity as Senate President, one of the Federalist candidates, Adams or Pinckney, might well have emerged victorious from the House runoff required under the Constitution. But Jefferson used his authority as Senate President to exclude his Federalist competitors, restricting the runoff to a two-man race between himself and Aaron Burr. This allowed him to emerge victorious on the thirty-sixth ballot. Rumors of this episode occasionally surfaced during the nineteenth century, but this article presents indisputable documentary evidence demonstrating the irregularity of the Georgia ballot. After telling the story, we appraise its significance both as an act of constitutional statesmanship and as an enduring legal precedent that may guide future Senate Presidents as they confront the electoral college crises of the twenty-first century

A CELLULAR DEFICIT IN THE RECONSTITUTIVE CAPACITY OF IMMUNE POPULATIONS OF LYMPHOID CELLS DEMONSTRABLE IN STUDIES OF DELAYED HYPERSENSITIVITY IN MICE : EVIDENCE FOR THYMUS-BONE MARROW CELL SYNERGISM

A cell-transfer system was employed in the present work to investigate several characteristics of the capacity of immune and normal lymphoid cells to transfer the delayed response to methylated human serum albumin in lethally irradiated syngeneic recipients. Spleen cells derived from donor mice immunized with goose erythrocytes were far less effective in transferring responsiveness when compared with equal numbers of normal cells. Statistical analyses indicated a frequency of 1 reactive cell or cell unit in 1.3 x 107 normal cells and in 6.2 x 107 immune cells. These findings provided confirmatory evidence that antigen-induced suppression (antigenic competition) employing sequential administration of two non-cross-reacting antigens is due to relative deficits of immunocompetent cells generated by lymphoproliferation in lymphoid tissues secondary to immunization with the initial antigen. The cellular deficit in the immune population was shown to be resident in a thymus cell population, which restored the number of responders to a level equivalent to the normal population. The thymic cell was akin to the antigen-reactive cell. The cell limiting the degree of response, that is the effector cell for both normal and immune cell populations, was of bone marrow origin. Both populations of cells were shown to act in synergy to reconstitute the delayed response to the antigen

How Ordering of Assignments Can Influence Beliefs About the Self and How These Beliefs Can Impact on Student Class Performance

This research examines whether the ordering of the difficulty of exams can influence student beliefs about their academic abilities and the impact of these beliefs on their performance. The ordering of the difficulty of test items has shown to affect performance. Study One (n=91) examined college student differences in reaction to a difficult and an easy exam. Results suggest that the ordering of difficulty of exams may influence self-efficacy of students. Study Two (n = 178) examines whether this self-efficacy (and other beliefs about the self) can impact college student performance on actual exam scores over time. The results of this research suggest that the ordering of difficulty of assignments can affect student’s self-efficacy about the class. It finds that the impact on self-efficacy may affect overall performance early in the class but that this impact may not be long lasting. This is due to the positive evidence received later in the course that may contradict initial low performance and give confidence in the student’s ability to achieve high performance. The results have implications for segments of the student population that may be disproportionately impacted by self-perceptions such as the first generation student. Cette recherche examine dans quelle mesure le classement des examens selon leur difficulté influence les croyances des étudiants par rapport à leurs habiletés académiques d’une part, et l’impact de ces croyances sur leur performance d’autre part. Il a été démontré que le classement des items d’un examen en fonction de leur difficulté a une incidence sur la performance. Étude #1 (n=91) porte sur les différences dans les réactions d’étudiants d’université à un examen difficile et à un examen facile. Les résultats portent à croire que l’ordre de présentation des examens selon leur difficulté peut influencer l’auto-efficacité des étudiants. Étude #2 (n=178) évalue dans quelle mesure cette auto-efficacité (et d’autres croyances relatives à soi) influence, à la longue, la performance aux examens des étudiants universitaires. Les résultats semblent indiquer que la présentation des examens en fonction de leur difficulté peut affecter la perception d’auto-efficacité chez les étudiants et que cet impact peut avoir des incidences sur la performance globale au début du cours mais que celles-ci peuvent être de courte durée. Ce phénomène s’explique par les indications positives qui peuvent venir contredire le faible rendement initial et rehausser la confiance des étudiants en leur capacité de bien réussir. Ces résultats comportent des implications touchant les secteurs de la population estudiantine qui pourraient être affectés de manière disproportionnée par leur image de soi, tels les étudiants de première génération

Photonics module and alignment method

A laser (24) is mounted in predetermined alignment with a monocrystalline mounting member (11) by defining in the mounting member a reference surface (18) that is displaced from a second surface (19). Solder (29) is placed on a second surface such that in its solid form its length and width each significantly exceeds its height. The laser is bonded to the reference surface such that part of the laser overlies the solder and is separated from the solder by a small gap (30). Next, the solder is melted to cause it to gather on the second surface sufficiently to contact an under surface (31) of the laser. The solder is then cooled such that the solder bonds the laser to the silicon mounting member.Published versio

Photonics module apparatus

A laser (15) is mounted on a planar surface of a monocrystalline silicon mounting member (12). A spherical lens (20) is mounted in a monocrystalline silicon cover member (13) which, when abutted and registered to the mounting member (12), aligns the spherical lens with the laser so that the output light can be projected along a precise predetermined path. The spherical lens (20) is mounted in a first V-shaped groove (31) which is made in the cover member by masking and etching. A second V-shaped groove intersects the first groove and defines a V-shaped edge in one side of the first groove. The spherical lens is then seated in the first V-shaped groove such that it bears against two points of the V-shaped edge and against one side wall (35) of the first V-shaped groove. A second lens (19) is mounted in the cover member in the same manner as the first lens and directs laser light from a rear facet of the laser to a mirror 30 and hence to a photodetector (21) mounted in the cover member.Published versio