Enhanced modeling features within TREETOPS

The original motivation for TREETOPS was to build a generic multi-body simulation and remove the burden of writing multi-body equations from the engineers. The motivation of the enhancement was twofold: (1) to extend the menu of built-in features (sensors, actuators, constraints, etc.) that did not require user code; and (2) to extend the control system design capabilities by linking with other government funded software (NASTRAN and MATLAB). These enhancements also serve to bridge the gap between structures and control groups. It is common on large space programs for the structures groups to build hi-fidelity models of the structure using NASTRAN and for the controls group to build lower order models because they lack the tools to incorporate the former into their analysis. Now the controls engineers can accept the hi-fidelity NASTRAN models into TREETOPS, add sensors and actuators, perform model reduction and couple the result directly into MATLAB to perform their design. The controller can then be imported directly into TREETOPS for non-linear, time-history simulation

Loyola Wellness Center: COVID-19 Care & Contact Tracing

Loyola Wellness Center: COVID-19 Care & Contact Tracing Social Justice Intern 2020-202

The emergence of female adolescent protagonists in selected twentieth-century novels from French Canada, Germany and Austria

The history of adolescent protagonists in adult literature is relatively brief. Young heroes and heroines only begin to appear significantly in narratives at the turn of the twentieth century, since the concept of adolescence is relatively new. During the first half of the 19003 the number of novels written with female adolescent protagonists in countries such as Austria, Germany, and Canada varies substantially. In German-speaking countries there are relatively few novels with young heroines, although this tendency has increased since the students\u27 and women\u27s movements in the late 19603 and early 19703. In contrast, works depicting female adolescent protagonists occur more frequently in French-Canadian novels written by female authors throughout and even before the twentieth century. The purpose of this dissertation is to investigate and compare themes in four twentieth-century novels which have female adolescent protagonists. These themes include the expression of love and sexuality, the individual’s relationships with friends and family members, the young woman’s response to a crisis, and the influence of social institutions. Care was taken to select novels which represent different historical periods of this century. Two of the novels are from German-speaking countries: Die Klosterschule (1968) by the Austrian novelist Barbara Frischmuth and Nach Mitternacht (193 7) by the German author Irmgard Keun. Two French-Canadian novels have been chosen: Gabrielle Roy\u27s Rue Deschambault (1955) and Anne Hébert’s Les Fous de Bassan (1982)

On a matrix method for the study of small perturbations in galaxies

A matrix method is formulated in a Lagrangian representation for the solution of the characteristic value problem governing modes of oscillation and instability in a collisionless stellar system. The underlying perturbation equations govern the Lagrangian displacement of a star in the six-dimensional phase space. This matrix method has a basis in a variational principle. The method is developed in detail for radial oscillations of a spherical system. The basis vectors required for the representation of the Lagrangian displacement in this case are derived from solutions of the Lagrangian perturbation equations for radial perturbations in a homogeneous sphere. The basis vectors are made divergence free in the six-dimensional phase space in accordance with the requirement of Liouville's theorem that the flow of the system in the phase space must be incompressible. The basis vectors are made orthogonal with respect to a properly chosen set of adjoint vectors with the aid of a Gram-Schmidt procedure. Some basis vectors are null vectors in the sense that their inner products with their own adjoint vectors vanish. The characteristic frequencies of the lowest radial modes are calculated in several approximations for members of a family of spherical models which span a wide range of central concentrations. The present formulation of the matrix method can be generalized for nonradial modes in spherical systems and for modes in axisymmetric systems.Comment: 30 pages, 11 figures, submitted to the Monthly Notices of the Royal Astronomical Societ

TidalSim Senior Project Report

Throughout the course of this project, our team helped the Cal Poly Biological Sciences department refine an intertidal zone simulator. The aim of this device is to allow any marine biologist to easily simulate a vast range of tidal zones in order to test animal behaviors within these zones. Another goal of this project is to make each simulation tank independent from the others by using a single microcontroller to handle all inputs and outputs of the system as well as logging all relevant data. The current system is set up so that a separate microcontroller handles dissolved oxygen and food dosing for all four tanks. One program controller per tank will make experiment setup more straightforward and thus was main goal of the project. Another goal was to make experiment setup data (tide transitions, temps, DO etc) input all in one file in Excel. The current system has some experiment data input through Excel and some that needs to be compiled in the code. This forces the scientists that use the simulator to be familiar with the development software and also introduces the risk of bugs being created accidentally. Our process to reach these goals and objectives has been documented in order to replicate the system in the future

Efficiency and capabilities of multi-body simulations

Simulation efficiency and capability go hand in hand. The more capability you have the lower the efficiency will be. The efficiency and capabilities are discussed. The lesson learned about generic simulation is: Don't rule out any capabilities at the beginning, but keep each one on a switch so it can be bypassed when warranted by a specific application

Plasma-mediated inactivation of Pseudomonas aeruginosa biofilms grown on borosilicate surfaces under continuous culture system

Biofilms are microbial communities attached to a surface and embedded in a matrix composed of exopolysaccharides and excreted nucleic acids. Bacterial biofilms are responsible for undesirable effects such as disease, prostheses colonization, biofouling, equipment damage, and pipe plugging. Biofilms are also more resilient than free-living cells to regular sterilization methods and therefore it is indispensable to develop better ways to control and remove them. The use of gas discharge plasmas is a good alternative since plasmas contain a mixture of reactive agents well-known for their decontamination potential against free microorganisms. We have previously reported that Pseudomonas aeruginosa biofilms were inactivated after a 1-min plasma exposure. We determined that the adhesiveness and the thickness of Pseudomonas biofilms grown on borosilicate were reduced. We also reported sequential morphological changes and loss of viability upon plasma treatment. However, the studies were carried out in batch cultures. The use of a continuous culture results in a more homogenous environment ensuring reproducible biofilm growth. The aim of this work was to study plasma-mediated inactivation of P. aeruginosa biofilms grown on borosilicate in a continuous culture system. In this paper we show that biofilms grown on glass under continuous culture can be inactivated by using gas discharge plasma. Both biofilm architecture and cell culturabilty are impacted by the plasma treatment. The inactivation kinetics is similar to previously described ones and cells go through sequential changes ranging from minimal modification without loss of viability at short plasma exposure times, to major structure and viability loss at longer exposure times. We report that changes in biofilm structure leading to the loss of culturability and viability are related to a decrease of the biofilm matrix adhesiveness. To our knowledge, there has been no attempt to evaluate the inactivation/sterilization of biofilms grown in a continuous system.Centro de Investigación y Desarrollo en Fermentaciones Industriale

Vandervoort & Flandin to V.H. Flandin, August 4, 1815

Receipt from Vandervoort & Flandin, a dry goods store, to V.H. Flandin for 5 1/2 yards of silk levantine. Acknowledgment of payment was made by N. Hempsted.https://digitalcommons.kean.edu/lhc_1810s/1125/thumbnail.jp