A phytosociological study of soligenous mires and springs in the north Pennines

Not availabl

Electron traps in rutile

Undoped samples of single crystal rutile and rutile powder have been studied by the methods of photoluminescence, thermoluminescence and thermally stimulated conductivity. Crystal samples doped with chromium, iron, manganese, cobalt and nickel and powder samples doped with chromium and iron were also studied. Additionally capacitance-voltage, current-voltage and deep level transient spectroscopy measurements were made on Schottky diodes fabricated on rutile made semiconducting by reduction and niobium doping. Undoped, chromium and nickel doped samples all showed one form of PL temperature dependence in which the luminescence was quenched above 190 K. Iron, cobalt and manganese doped samples showed a different dependence in which the intensity decreased from 80 K. The chromium doped powders showed an increase in photoluminescence intensity with chromium doping which supports the view of several workers that chromium provides the luminescence centre in rutile. Evidence was found in thermoluminescence spectra for nine different trapping levels. Thermoluminescence measurements on powders indicated that the spectra were composed of the same peaks found in the crystal samples, although they were not distinct. DLTS spectra from a niobium doped rutile crystal showed one dominant maximum. The variation of this maximum with the DLTS rate window gave an activation energy and a capture cross-section in excellent agreement with the values for the dominant TSL peak and suggests that the simple insulator model used for TSL analysis applies well to rutile. The DLTS result allows the results for trap depths derived from TSL measurements to be viewed with some confidence

Raising Our Standards: Rethinking the Supreme Court’s Abortion Jurisprudence

Part II of this Note explores the Supreme Court’s abortion jurisprudence by discussing MKB Management Corp. v. Stenehjem, which declared a North Dakota statute barring abortions after a fetus has a detectable heartbeat to be unconstitutional. Next, Part III analyzes the relevant history surrounding abortion rights and the rationale behind the precedent relied on in Stenehjem. Part IV examines the U.S. Court of Appeals for the Eighth Circuit’s decision to void the statute, along with the Eighth Circuit’s vehement plea for a new abortion standard. Finally, Part V of this Note reveals flaws in the Supreme Court’s current abortion jurisprudence and concludes with an outlook on future challenges to the abortion standard

Elopement Prevention: Promoting Safety and Supporting Participation

The goal of this capstone project was to create resources promoting elopement prevention and provide suggestions for anti-elopement equipment visits at the Vanderbilt Pediatric Seating & Mobility Clinic. Research indicates that 50% of families have never received guidance about elopement prevention from a healthcare professional. The tools created during this capstone project were meant to improve equipment visits, educate caregivers, and empower future occupational therapy practitioners. The goals were achieved through collaboration with stakeholders, completing a review of the literature, attending a child passenger safety technician course, and developing resources. The result was a social story and sensory toolbox for clinic visits, informational handouts for caregivers, a “smart phrase document” for letters of medical necessity, and a recorded PowerPoint presentation for occupational therapy practitioners

Grit at work

Grit—the tendency to pursue especially long-term goals with both passion and perseverance—has been shown to predict high achievement in a range of individual performance domains. We make a case for introducing the concept of grit to the organizational behavior literature. To begin, we elaborate the conceptual foundations of grit, highlighting ways in which grit differs from related traits and situating grit in the broader literature on goal pursuit. We then discuss three organizational antecedents—leadership, culture, and job design—that can encourage grit at work. Next, we discuss how and under what circumstances encouraging grit can improve workplace outcomes such as employee retention, work engagement, and job performance. We conclude with suggestions for future research at the intersection of psychology and organizational behavior

bak deletion stimulates gastric epithelial proliferation and enhances Helicobacter felis-induced gastric atrophy and dysplasia in mice

Helicobacter infection causes a chronic superficial gastritis that in some cases progresses via atrophic gastritis to adenocarcinoma. Proapoptotic bak has been shown to regulate radiation-induced apoptosis in the stomach and colon and also susceptibility to colorectal carcinogenesis in vivo. Therefore we investigated the gastric mucosal pathology following H. felis infection in bak-null mice at 6 or 48 wk postinfection. Primary gastric gland culture from bak-null mice was also used to assess the effects of bak deletion on IFN-γ-, TNF-α-, or IL-1β-induced apoptosis. bak-null gastric corpus glands were longer, had increased epithelial Ki-67 expression, and contained fewer parietal and enteroendocrine cells compared with the wild type (wt). In wt mice, bak was expressed at the luminal surface of gastric corpus glands, and this increased 2 wk post-H. felis infection. Apoptotic cell numbers were decreased in bak-null corpus 6 and 48 wk following infection and in primary gland cultures following cytokine administration. Increased gastric epithelial Ki-67 labeling index was observed in C57BL/6 mice after H. felis infection, whereas no such increase was detected in bak-null mice. More severe gastric atrophy was observed in bak-null compared with C57BL/6 mice 6 and 48 wk postinfection, and 76% of bak-null compared with 25% of C57BL/6 mice showed evidence of gastric dysplasia following long-term infection. Collectively, bak therefore regulates gastric epithelial cell apoptosis, proliferation, differentiation, mucosal thickness, and susceptibility to gastric atrophy and dysplasia following H. felis infection

Market participation and embedded critique in John Rawl's theory of justice.

John Rawls has been criticised for wrongly specifying the relationship between persons' ongoing emotional and intellectual commitments and their capacity to reflect on and revise those commitments. While there are, arguably successful, responses to this critique, the difficulty shows up, I argue, in connection with his representation of the problem of stability. Stability, in an ongoing Rawlsian society, if it is to be realistic, requires an accommodation of competing, personal concerns, concerns grounded in "comprehensive" moral doctrines. However, when appeal to Rawls' principles of justice is required in order to settle disputes, in an ongoing Rawlsian society, the disputants must adopt a neutral standpoint that mutes the practical salience of their personal concerns. Those concerns, then, will not be engaged in deliberation. This has the implication that a person must respond to a judgement that goes against her by rescinding what she sees, prima facie, as a legitimate concern. This represents the problem of stability as one of how to extinguish unsupported practical considerations. The problem ought to be represented, rather, as one of how to accommodate competing concerns while keeping their practical salience, for the individuals whose concerns they are, intact. Ways to attempt to remedy this can be drawn on from outside of Rawlsian theory. In this thesis, however, I attempt to show how one can address the issue from within a Rawlsian account. Centrally, I note that Rawlsian citizens are, by assumption, market participants, at least insofar as they are involved in a system of discretionary exchange, and that, in order to be adequately specified as market participants, they must possess certain characteristics. An exploration of these characteristics offers, or so I argue, a conception of the relationship between ongoing personal commitments and the capacity for radical critique that promises to address the deficiency in Rawls' representation of the problem of social stability

Estimating Phase Velocity and Attenuation of Guided Waves in Acoustic Logging Data

Phase velocity and attenuation of guided waves have been estimated from multireceiver, full waveform, acoustic logging data using the extended Prony's method. Since a formation affects velocity and attenuation, estimating these quantities is important in evaluating the formation properties. The estimation is performed using an array processing technique which requires two steps: (1) the traces for all receivers are transformed into the frequency domain, and (2) for each frequency the extended Prony's method is used to determine the presence of a guided wave propagating past the array of receivers. The guided wave properties estimated by the Prony's method include amplitude, attenuation, and phase change which is related to phase velocity. An important assumption in this array processing technique is that the formation, borehole fluid, and tool are homogeneous along the receiving array. For synthetic data, the phase velocities and attenuation of the tube wave and two modes of the pseudo-Rayleigh wave are accurately estimated over many frequencies, with the exception that the low amplitude of the second mode causes its attenuation estimate to be somewhat less accurate. For laboratory data, very good estimates of the phase velocities of the tube wave and three modes of the pseudo-Rayleigh wave are obtained. Since the materials used in the laboratory experiment had very large quality factors, the attenuation could not be estimated. For field data, the dispersion of the tube wave and the velocity of the pseudo-Rayleigh wave at its cutoff are very close to those predicted by another, independent method. Accurate attenuation estimates could not be made because the data are noisy and consist of only eight traces.Massachusetts Institute of Technology. Full Waveform Acoustic Logging Consortiu