<p>Natural and constructed clay liners are routinely used to contain waste and wastewater. The impact of acidic solutions on the geochemistry and mineralogy of clays has been widely investigated in relation to acid mine drainage systems at pH > 1.0. The impact of sulfuric acid leachate characterized by pH < 1.0, including potentially negative pH values on the geochemistry and mineralogy of clays is, however, not clear.</p> <p>To address this deficiency a series of batch and diffusion cell studies, investigating the geochemical and mineralogical impacts of H₂SO₄ solutions (pH 5.0 to -3.0), were conducted on three mineralogically distinct clays (Kc, Km, and BK). Batch testing was conducted at seven pH treatments (5.0, 3.0, 1.0, 0.0, -1.0, -2.0 and -3.0) using standardized sulfuric acid solutions for four exposure periods (14, 90, 180, and 365 d). Aqueous geochemical, XRD, and Si and Al XANES analyses showed: increased dissolution of aluminosilicates with decreasing pH and increasing exposure period; preferential dissolution of aluminosilicate Al-octahedral layers relative to Si-tetrahedral layers; formation of an amorphous silica-like phase that was confined to the surface layer of the altered clay samples at pH ⤠0.0 and t ⥠90 d; and precipitation of anhydrite and a Al-SO₄-rich phase (pH ⤠-1.0, t ⥠90 d).</p> <p>The diffusive transport of H₂SO₄ (pH =1.0, -1.0, and -3.0) through the Kc and Km clays for 216 d was examined using single reservoir, constant concentration, diffusion cells. The diffusive transport of H⁺ within the cells was modeled using 1-D transport models that assumed no absorption, linear absorption, and non-linear absorption of H⁺. The absorption isotherms were calculated from the pH 5.0, 3.0, and 1.0 batch experiment results, which were assumed representative of H⁺ absorption at pH < 1.0. However, model results indicated that the batch test results can not account for the observed H⁺ consumption in all cells and greatly underestimate the amount of H⁺ consumption in the pH -1.0 and -3.0. In the Kc and Km diffusion cells, above-background Ca, Al, Fe, and Si aqueous concentrations were associated with depth intervals characterized by decreased pH values. Respective peak concentrations of 325, 403, 176, 11.7, and 1.38 x 10³ μmol g^-1 (Kc) and 32.4, 426, 199, 7.2, and 1.22 x 10³ μmol g^-1 (Km) were measured in the pH -3.0 cells. XRD results showed that the elevated concentrations corresponded to the loss of carbonates and montmorillonite peaks and decreased peak intensities for illite and kaolinite in depth intervals with pH ⤠1.0, in the Kc and Km pH -1.0 and -3.0 cells.</p> <p>The combined results of these studies indicated that the long-term diffusion of H₂SO₄ through clays at pH < 1.0 will result in a large amount of primary phase dissolution; however, this will be accompanied by precipitation of soluble Ca and Al sulfate salts and amorphous silica, especially at pH ⤠0.0. Additionally, the presence of even a small amount of carbonate will serve to greatly buffer the diffusive transport of H₂SO₄ through clays, even at a source pH of -3.0.</p>

This thesis presents the results of high supply (up to 84 bar) pressure testing of hole-pattern annular gas seals performed at the Texas A & M Turbomachinery Laboratory in College Station, TX. The test variables were chosen to determine the influence of pressure ratio, rotor speed, and negative preswirl on seal performance. Preswirl signifies the circumferential fluid flow entering a seal, and negative preswirl indicates a fluid swirl in the direction opposite of rotor rotation. Changes in pressure ratio had only small effects on most rotordynamic coefficients. Cross-coupled stiffness showed slightly different profiles through the mid-range of excitation frequencies. Pressure ratio showed some influence on direct and cross-coupled damping at low excitation frequencies. Rotor speed significantly affected both cross-coupled stiffness and cross-coupled damping. As rotor speed increased, the magnitude of cross-coupled rotordynamic coefficients increased due to the positive fluid swirl induced by rotor rotation. For the low rotor speed, negative inlet preswirl was able to overpower the positive rotor induced fluid rotation, producing a negative cross-coupled stiffness. This outcome showed that, for hole-pattern seals, positive fluid swirl does indeed produce positive cross-coupled stiffness coefficients and negative fluid swirl produces negative cross-coupled stiffness coefficients. The addition of negative preswirl greatly reduced cross-coupled rotordynamic coefficients, while direct rotordynamic terms were unaffected. Cross-over frequency signifies the excitation frequency where effective damping transitions from a negative value to a positive value with increasing excitation frequency. Peak effective damping was increased by 50 percent and cross-over frequency reduced by 50 percent for high-negative preswirl versus zero preswirl results. This led to the conclusion that a reverse swirl could greatly enhance the stability of hole-pattern balance piston seals. A two-control-volume model that uses the ideal gas law at constant temperature (ISOT) was used to predict rotordynamic coefficients and leakage. This model predicted direct rotordynamic coefficients well, but greatly under predicted cross-coupled rotordynamic coefficients especially at high negative preswirls. The model predicted seal leakage well at low pressure ratios, but showed increasing error as the pressure ratio was increased. These results showed that the prediction model could not adequately estimate cross-coupled rotordynamic coefficients for a hole-pattern seal with negative inlet preswirl and requires modification to do so.

Novel wave phenomena in two- and three-dimensional (2D and 3D) phononic crystals were investigated experimentally using ultrasonic techniques. Resonant tunneling of ultrasonic waves was successfully observed for the first time by measuring the transmission of ultrasound pulses through a double barrier consisting of two 3D phononic crystals separated by a cavity. This effect is the classical analogue of resonant tunneling of a quantum mechanical particle through a double potential barrier, in which transmission reaches unity at resonant frequencies. For phononic crystals, the tunneling peak was found to be less than unity, an effect that was explained by absorption. The dynamics of resonant tunneling was explored by measuring the group velocities of the ultrasonic pulses. Very slow and very fast velocities were found at frequencies close to and at the resonance, respectively. These extreme values are less than the speed of sound in air and greater than the speed of sound in any of the crystal’s constituent materials. Negative refraction and focusing effects in 2D phononic crystals were also observed. Negative refraction of ultrasound was demonstrated unambiguously in a prism-shaped 2D crystal at frequencies in the 2nd pass band where the wave vector and group velocity are opposite. The Multiple Scattering Theory and Snell’s law allowed theoretical predictions of the refraction angles. Excellent agreement was found between theory and experiment. The negative refraction experiments revealed a mechanism that can be used to focus ultrasound using a flat phononic crystal, and experiments to demonstrate the focusing of ultrasound emitted by several point sources were successfully carried out. The importance of using phononic crystals with circular equifrequency contours, as well as matching the size of the contours inside and outside the crystal, was established. Both conditions were satisfied by a flat phononic crystal of steel rods, in which the liquid inside the crystal (methanol) was different from the outside medium (water). The possibility of achieving subwavelength resolution using this phononic crystal was investigated with a subwavelength line source (a miniature strip-shaped transducer, approximately lambda/5 wide, where lambda is sound wavelength in water). A resolution of 0.55lambda was found, which is just above the diffraction limit lambda/2. / October 2007

I analyze the potentially self-destructive tension inherent in liberalism between conceptions of negative liberty and positive liberty. In doing so, I utilize Aristotle’s theory of virtue to show that virtue is the best method of resolving this tension. In addition, I demonstrate that liberal virtues are best construed as virtues of intellect to be exercised in the public sphere. In particular, I show the importance of not construing liberal virtues as virtues of character (often referred to as moral virtues), because advocating such virtues is, in fact, contrary to the central tenets of liberalism. That is, I argue that it is illiberal to ask liberal citizens to develop a certain moral character, and that it is, instead, essential for said citizens to develop intellectual virtues as a method of resolving this tension within liberalism between the virtues needed to sustain liberalism and liberalism’s resistance towards promoting those virtues.

Negativöverspridning från arbetsliv till privatliv och från privatliv till arbetslivuppkommer när beteenden, humör, stress eller känslor från den ena sfären på ettnegativt sätt påverkar den andra sfären. Denna uppsats har en kvalitativ ansatsoch undersökte lärares upplevelse av negativ överspridning mellan arbetsliv ochprivatliv och tvärtom. Respondenterna var 16 lärare inom grundskola ochgymnasieskola som förde dagbok kring negativ överspridning. De typer av negativöverspridning som nämndes oftast var 1) hög arbetsbelastning, 2) tankar ellerkänslor som stör, 3) trötthet, 4) problem med andra människor samt 5) problemmed maskiner. Resultatet visade att respondenterna rapporterade mer negativöverspridning mellan arbetsliv och privatliv än tvärtom. Respondenterna uppgavatt de arbetade mycket och att förtroendetiden oftast inte räckte till. Deflesta lärare som avböjde medverkan i studien gjorde detta på grund av överbelastningi arbetssituationen. / Negative spillover from work to family and vice versa often occurs when forinstance behaviour, mood, stress and feelings from one domain negatively affectthe other domain. This qualitative thesis investigated teachers perceptions ofnegative spillover from work to family and vice versa. The respondents were 16teachers in primary and secondary school which wrote a diary about negativespillover. The types of negative spillover that occured most frequently were 1)high workload, 2) disturbing thoughts or feelings, 3) fatigue, 4) problems withother human beings and 5) problems with machines. The results showed that therespondents reported more negative spillover from work to family, than fromfamily to work. Most of the respondents worked a lot and the time of trust werenot enough. The respondents who declined participation in the study did thisbecause of an overload in their work situation.

The immense inequalities between the world’s poor and the world’s rich have compelledphilosopher Thomas Pogge to develop a moral framework based on the Universal Declarationof Human Rights that challenges our most commonsense political moral views. Poggedisputes minimally and universally that we all have a negative duty not to harm so long as theharm is foreseeable and avoidable, rather than a positive duty to do well. Furthermore Poggeargues for an institutional view of negative duties flown from the fact that we all shape,uphold and impose institutions.With the help of three philosophers; Polly Vizard, Tim Hayward and Mathias Risse, Idebate a number of their raised objections to Thomas Pogge’s theory of institutional globaljustice which all focus on the controversial causal claim that the present global order causesglobal poverty. The objections discussed are (a) Vizard’s scrutinizing of Pogge’s notion ofresponsibility (b) Hayward’s call for a full causal account of how the global order is harmingthe poor and (c) Risse’s alternative baseline for harm. I argue that although Pogge has somepotential problems, he nevertheless is not contradicted by these objections to the extent thatthey themselves claim. I hold that the debated criticism appeals for further investigation andthat in light of the arguments in this thesis we have a negative duty not to harm and a positiveobligation to reform global unjust institutions in responding to global poverty.

Box and Jenkins methodologies have massively contributed to the analysis of time series data. However, the assumptions used in these methods impose constraints on the type of the data. As a result, difficulties arise when we apply those tools to a more generalized type of data (e.g. count, categorical or integer-valued data) rather than the classical continuous or more specifically Gaussian type. Papers in the literature proposed alternate methods to model discrete-valued time series data, among these methods is Pegram's operator (1980). We use this operator to build an AR(p) model for integer-valued time series (including both positive and negative integers). The innovations follow the differenced Poisson distribution, or Skellam distribution. While the model includes the usual AR(p) correlation structure, it can be made more general. In fact, the operator can be extended in a way where it is possible to have components which contribute to positive correlation, while at the same time have components which contribute to negative correlation. As an illustration, the process is used to model the change in a stock’s price, where three variations are presented: Variation I, Variation II and Variation III. The first model disregards outliers; however, the second and third include large price changes associated with the effect of large volume trades and market openings. Parameters of the model are estimated using Maximum Likelihood methods. We use several model selection criteria to select the best order for each variation of the model as well as to determine which is the best variation of the model. The most adequate order for all the variations of the model is $AR(3)$. While the best fit for the data is Variation II, residuals' diagnostic plots suggest that Variation III represents a better correlation structure for the model.

<p>Natural and constructed clay liners are routinely used to contain waste and wastewater. The impact of acidic solutions on the geochemistry and mineralogy of clays has been widely investigated in relation to acid mine drainage systems at pH > 1.0. The impact of sulfuric acid leachate characterized by pH < 1.0, including potentially negative pH values on the geochemistry and mineralogy of clays is, however, not clear.</p> <p>To address this deficiency a series of batch and diffusion cell studies, investigating the geochemical and mineralogical impacts of H₂SO₄ solutions (pH 5.0 to -3.0), were conducted on three mineralogically distinct clays (Kc, Km, and BK). Batch testing was conducted at seven pH treatments (5.0, 3.0, 1.0, 0.0, -1.0, -2.0 and -3.0) using standardized sulfuric acid solutions for four exposure periods (14, 90, 180, and 365 d). Aqueous geochemical, XRD, and Si and Al XANES analyses showed: increased dissolution of aluminosilicates with decreasing pH and increasing exposure period; preferential dissolution of aluminosilicate Al-octahedral layers relative to Si-tetrahedral layers; formation of an amorphous silica-like phase that was confined to the surface layer of the altered clay samples at pH ⤠0.0 and t ⥠90 d; and precipitation of anhydrite and a Al-SO₄-rich phase (pH ⤠-1.0, t ⥠90 d).</p> <p>The diffusive transport of H₂SO₄ (pH =1.0, -1.0, and -3.0) through the Kc and Km clays for 216 d was examined using single reservoir, constant concentration, diffusion cells. The diffusive transport of H⁺ within the cells was modeled using 1-D transport models that assumed no absorption, linear absorption, and non-linear absorption of H⁺. The absorption isotherms were calculated from the pH 5.0, 3.0, and 1.0 batch experiment results, which were assumed representative of H⁺ absorption at pH < 1.0. However, model results indicated that the batch test results can not account for the observed H⁺ consumption in all cells and greatly underestimate the amount of H⁺ consumption in the pH -1.0 and -3.0. In the Kc and Km diffusion cells, above-background Ca, Al, Fe, and Si aqueous concentrations were associated with depth intervals characterized by decreased pH values. Respective peak concentrations of 325, 403, 176, 11.7, and 1.38 x 10³ μmol g^-1 (Kc) and 32.4, 426, 199, 7.2, and 1.22 x 10³ μmol g^-1 (Km) were measured in the pH -3.0 cells. XRD results showed that the elevated concentrations corresponded to the loss of carbonates and montmorillonite peaks and decreased peak intensities for illite and kaolinite in depth intervals with pH ⤠1.0, in the Kc and Km pH -1.0 and -3.0 cells.</p> <p>The combined results of these studies indicated that the long-term diffusion of H₂SO₄ through clays at pH < 1.0 will result in a large amount of primary phase dissolution; however, this will be accompanied by precipitation of soluble Ca and Al sulfate salts and amorphous silica, especially at pH ⤠0.0. Additionally, the presence of even a small amount of carbonate will serve to greatly buffer the diffusive transport of H₂SO₄ through clays, even at a source pH of -3.0.</p>

The celebrity status is seen in a wide variety of domains that ranges from entertainment, to sport, to politic communities. It operates as a way of providing distinctions and definitions of success within those domains (Marshall, 1997). The purpose of the thesis is to investigate the paradigmatic elements of celebrity negative information across different celebrity domains. The word paradigmatic is used because over the years we have seen celebrities killing their careers as consequence of their wild behavior. In the other hand we have also seen celebrities booming their careers. This thesis is an attempt to improve our understanding on which factors are of relevance when celebrities’ meltdown causing potential sources of troubles to stakeholders related with them. In summations the objective is finding patterns among the paradox and inconsistencies over the years of real life celebrity cases. We first analyze how the consumptions of celebrity offering yields different type of values to consumers that construct an OVP optimal value point. This OPV can be seen as a combination of enabling attributes and enhancing attributes. Enabling attributes such as “quality and efficiency” are a must for a human brand to even achieve celebrity status. The enhancing type of attributes such as “ethics or charity” bring that extra mile or added value not necessary to obtain success but beneficial to their overall image. In addition a discussion if celebrity negative information caused by illegal or immoral behavior can lead to value destruction affecting consumption patterns is presented whereas a qualitative study based on real life cases was carried out. The results showed that “consistency” with the celebrity previous behavior and image are crucial to anticipate how the consumers will react to a case of negative celebrity information. The celebrity “domain” revealed some tolerance bringing or blocking effect towards negative celebrity information. In conclusion this exploratory study is a good starting point to prove that not all negative celebrity information is negative to a celebrity and thus there is no general recipe to study these incidents. By bringing a framework like the one presented it is easier to isolate and study one case at a time. At the end of the paper we applied the framework and anticipated the response of Swedish consumer’s to a real drugs case scandal involving a singer.

The Relationship between the Perceptions of Organizational politics to staff Affectivity and the Characteristics of Job¡¦s Interaction. ABSTRACT This research is based on the framework of revision model proposed by Ferris et al. (2002), discussing the Relationship between the Perceptions of organizational politics to staff status, staff Affectivity and the Characteristics of Job¡¦s Interaction. It takes 130th staffs of 40 Organization in Taiwan as the research object. 2133 copies of questionnaire have been issued and 1,940 copies have been taken back, the returns-ratio reaches 91.0%. After rejecting 50 invalid copies, the effective volume is 1,890, and effective returns-ratio is 88.6%. The data were analyzed by descriptive statistics, item analysis, reliability analysis, correlation analysis, factor analysis and hierarchical linear model. The major results of this study are as fallowing: 1-1. Positive Affectivity of Staff has a significant effect on perceptions of organizational politics. 1-2. Negative Affectivity of Staff has a significant effect on perceptions of organizational politics. 2-1. The interaction of supervisor and staff has a significant effect of organizational politics. 2-2. The interaction of staff and colleague has a significant effect on perceptions of organizational politics. 3-1.The interaction of staff and supervisor has moderate effect on the relationship between staff Positive affectivity and Perceptions of organizational politics. 3-2.The interaction of staff and supervisor has moderate effect on the relationship between staff negative affectivity and Perceptions of organizational politics. 3-3.The interaction of staff and colleagues has moderate effect on the relationship between staff Positive affectivity and Perceptions of organizational politics. 3-4.The interaction of staff and colleagues has not moderate effect on the relationship between staff Positive affectivity and Perceptions of organizational politics.