Fuel Systems of SI-engines

Cílem této práce je vytvořit přehled palivových systémů používaných u moderních zážehových motorů a popsání základních komponent těchto systémů. Dále bude popsána funkce jednotlivých těchto komponent a režimy provozu palivového systému při různých režimech provozu motoru. Nakonec budou charakterizovány vybrané motory s těmito systémy.The aim of this work is to create a list of fuel systems used in modern gasoline engines and describe the basic components of these systems. It will then be described the function of each of these components and modes of operation of the fuel system at different modes of engine operation. Finally, will be characterized by the selected engines with these systems.

The Political Economy of a Neighborhood Spat

The dramas of daily life are often substance for true anthropological inquiry because they present us with examples of social conflict and its resolution, thereby illuminating perennial questions faced by members of a society. What can a dispute between two neighbors in a not-so-remote village of Cape Cod tell us that might be of interest to students of dispute resolution, resource use, and even political economy? The dispute examined here appears to have far-reaching implications not only because of the disputants themselves, representatives of two classes of American citizenry; but also because their conflict and the process used to achieve resolution address important environmental and ecological dilemmas faced by Americans today

Sistemes de posicionament local indoor per a aplicacions dron

This document consists of the study and implementation of the control and the indoor local positioning of drones. It is divided into three different parts. The first one is about the theoretical study of the global and local current positioning systems. The types of local positioning systems are described and they will be compared based on the different technologies they use such as radiofrequency, laser, magnetic and computer vision. Then, it is studied and investigated the basis of the project, the open source drone Crazyflie that will be used for the remote passive location systems and Parrot AR.Drone for the remote active location system. A primary control system will be developed in order to fly the Crazyflie and this system will include a fall safe to protect the drone in case it falls. Finally, some different local positioning systems have been studied as well as their characteristics and the possibility to implement and integrate them into our project. Computer vision has been chosen to deploy the system for being economically cheap and easy to implement. Using the Python programming language, the open library OpenCV for computer vision and taking advantage of open source software of the two drones that we work with, the control and positioning have been carried out. Experimentally, it has been tried to position the drones into a target area using computer vision. Unfortunately we have not been able to stabilize the Crazyflie for more than 2 seconds inside the desired area

Decays of Non-strange Negative Parity Baryons in the 1/Nc Expansion

The decays of non-strange negative parity baryons via the emission of single $\pi$ and $\eta$ mesons are analyzed in the framework of the $1/N_c$ expansion. A basis of spin-flavor operators for the partial wave amplitudes is established to order $1/N_c$ and the unknown effective coefficients are determined by fitting to the S- and D-wave partial widths as provided by the Particle Data Group. A set of relations between widths that result at the leading order, i.e. order $N_c^0$, is given and tested with the available data. Up to a few exceptions, a good description of the partial decays widths is already obtained at that order. Because of the rather large errors in the empirical input data the next to leading order fit fails to pin down with satisfactory accuracy the subleading effective coefficients. The hierarchy expected from the $1/N_c$ expansion is reflected in the results.Comment: 24 pages, 8 table

A pilot project to evaluate intensive desensitisation, oral tolerance therapy and hunger provocation programme for children who have had prolonged tube feeds

Background: Some children with feeding difficulties may require nasogastric tube feeding or insertion of a percutaneous endoscopic gastrostomy (PEG) from a young age. A small cohort of these children can develop severe oral aversions that can delay the re-introduction of oral feeding. Multidisciplinary approaches that provide an intensive approach are deemed the most effective method of intervention to reduce nasogastric and PEG dependency. Methods: Two children and their parents received an intensive approach to reduce PEG feeds (Child A and Child B), while one child and her parents elected to receive a traditional feeding clinic approach (Child C). The mean age of the participants was 4 years 4 months. Results: Child A initially took 2090 kJ (44% daily nutritional requirement) via her PEG before the intensive program, and Child B took 100% daily nutritional requirement via his PEG. Three months post the intervention, Child A took 100% of her nutritional requirements orally and Child B had reduced PEG requirement significantly to 38% of daily nutritional requirement. Child C showed no changes in PEG versus oral intake. Children who received the intervention were able to remain focused on mealtimes for longer, with fewer instances of leaving the table. Parents altered their language styles post coaching on the intensive intervention using fewer reprimands. No changes with these behaviours were noted with Child C. Conclusions: Although this was a small pilot study, there are some strategies used within an intensive multidisciplinary context that can enable children to reduce their reliance on PEG feeds significantly

The Changing College Classroom: A View from CART

Higher education, like many institutions in the United States, is undergoing profound change. At Bridgewater, faculty members are increasingly becoming aware that societal issues, computerization and the demands of a highly competitive economy require a reevaluation of the classroom and the process of learning. At a conference sponsored by the Center for the Advancement of Research and Teaching in May, four Bridgewater faculty members and a librarian joined in a panel discussion to offer their perspectives on “the changing college classroom.

Composite leptons and quarks constructed as triply occupied quasiparticles in quaternionic quanutm mechanics

\noindent We propose a set of rules for constructing composite leptons and quarks as triply occupied quasiparticles, in the quaternionic quantum mechanics of a pair of Harari-Shupe preons $T$ and $V$. The composites fall into two classes, those with totally antisymmetric internal wave functions, and those with internal wave functions of mixed symmetry. The mixed symmetry states consist of precisely the three spin 1/2 quark lepton families used in the standard model (48 particle states, {\it not} counting the doubling arising from antiparticles), plus one doublet of spin 3/2 quarks (24 particle states). The antisymmetric states consist of a set of spin 3/2 leptonic states with charges as in a standard model family (16 particle states), and a spin 1/2 leptonic fractionally charged doublet (4 particle states). We sketch ideas for deriving our rules from a fundamental quaternionic preonic field theory.Comment: 10pages,plain tex, IASSNS-HEP-94/2

Nuclear and nucleon transitions of the H di-baryon

We consider 3 types of processes pertinent to the phenomenology of an H di-baryon: conversion of two $\Lambda$'s in a doubly-strange hypernucleus to an H, decay of the H to two baryons, and -- if the H is light enough -- conversion of two nucleons in a nucleus to an H. We compute the spatial wavefunction overlap using the Isgur-Karl and Bethe-Goldstone wavefunctions, and treat the weak interactions phenomenologically. The observation of $\Lambda$ decays from doubly-strange hypernuclei puts a constraint on the H wavefunction which is plausibly satisfied. In this case the H is very long-lived as we calculate. An absolutely stable H is not excluded at present. SuperK can provide valuable limits

Effect of androgen treatment during foetal and/or neonatal life on ovarian function in prepubertal and adult rats

We investigated the effects of different windows of testosterone propionate (TP) treatment during foetal and neonatal life in female rats to determine whether and when excess androgen exposure would cause disruption of adult reproductive function. Animals were killed prepubertally at d25 and as adults at d90. Plasma samples were taken for hormone analysis and ovaries serial sectioned for morphometric analyses. In prepubertal animals, only foetal+postnatal and late postnatal TP resulted in increased body weights, and an increase in transitory, but reduced antral follicle numbers without affecting total follicle populations. Treatment with TP during both foetal+postnatal life resulted in the development of streak ovaries with activated follicles containing oocytes that only progressed to a small antral (smA) stage and inactive uteri. TP exposure during foetal or late postnatal life had no effect upon adult reproductive function or the total follicle population, although there was a reduction in the primordial follicle pool. In contrast, TP treatment during full postnatal life (d1-25) resulted in anovulation in adults (d90). These animals were heavier, had a greater ovarian stromal compartment, no differences in follicle thecal cell area, but reduced numbers of anti-Mullerian hormone-positive smA follicles when compared with controls. Significantly reduced uterine weights lead reduced follicle oestradiol production. These results support the concept that androgen programming of adult female reproductive function occurs only during specific time windows in foetal and neonatal life with implications for the development of polycystic ovary syndrome in women