Flexural analysis of uplifted rift flanks on Venus

Knowledge of the thermal structure of a planet is vital to a thorough understanding of its general scheme of tectonics. Since no direct measurements of heat flow or thermal gradient are available for Venus, most estimates have been derived from theoretical considerations or by analog with the Earth. The flexural response of the lithosphere to applied loads is sensitive to regional thermal structure. Under the assumption that the yield strength as a function of depth can be specified, the temperature gradient can be inferred from the effective elastic plate thickness. Previous estimates of the effective elastic plate thickness of Venus range from 11-18 km for the foredeep north of Uorsar Rupes to 30-60 km for the annular troughs around several coronae. Thermal gradients inferred for these regions are 14-23 K km(exp -1) and 4-9 K km(exp -1) respectively. In this study, we apply the same techniques to investigate the uplifted flanks of an extensional rift. Hypotheses for the origin of uplifted rift flanks on Earth include lateral transport of heat from the center of the rift, vertical transport of heat by small-scale convection, differential thinning of the lithosphere, dynamical uplift, and isostatic response to mechanical uploading of the lithosphere. The 1st hypothesis is considered the dominant contributor to terrestrial rift flanks lacking evidence for volcanic activity, particularly for rift structures that are no longer active. In this study, we model the uplifted flanks of a venusian rift as the flexural response to a vertical end load

Healing the Hurt: Trauma-Informed Approaches to the Health of Boys and Young Men of Color

From discrimination and poverty to alcoholism and assault, trauma in its varied forms plays a major part in the lives of Latino and African-American boys and young men. This paper outlines the ways in which violence prevention, family support, health care, foster care, and juvenile justice can incorporate a trauma-informed approach to improve the physical and mental health of young men and boys

Molecular gas in QSO host galaxies

We present the results of a survey for CO line emission from a sample of nearby QSO hosts taken from the Hamburg/ESO survey (HES) and the Veron-Cetty and Veron quasar catalogue. From a total of 39 observed sources we clearly detected 5 objects with >10sigma signals (HE 0108-4743, HE 0224-2834, J035818.7-612407, HE 1029-1831, HE 2211-3903). Further 6 sources show marginal detections on the 2sigma level.Comment: 4 pages, 1 figure, submitted to "QSO Hosts: Evolution and Environment", P.D. Barthel, D.B. Sanders, eds., August 2005, Leiden University (The Netherlands), New Astr. Re

Antibiotics for trachoma.

BACKGROUND: Trachoma is the world's leading infectious cause of blindness. In 1997 the World Health Organization (WHO) launched an Alliance for the Global Elimination of Trachoma by the year 2020, based on the 'SAFE' strategy (surgery, antibiotics, facial cleanliness and environmental improvement). OBJECTIVES: To assess the evidence supporting the antibiotic arm of the SAFE strategy by assessing the effects of antibiotics on both active trachoma (primary objective) and on Chlamydia trachomatis (C. trachomatis) infection of the conjunctiva (secondary objective). SEARCH STRATEGY: We searched CENTRAL (which contains the Cochrane Eyes and Vision Group Trials Register) (The Cochrane Library 2010, Issue 11), MEDLINE (January 1950 to December 2010), EMBASE (January 1980 to December 2010), the metaRegister of Controlled Trials (mRCT) (www.controlled-trials.com) (December 2010) and ClinicalTrials.gov (www.clinicaltrials.gov) (December 2010). We used the Science Citation Index to look for articles that cited the included studies. We searched the reference lists of identified articles and we contacted authors and experts for details of further relevant studies. There were no language or date restrictions in the search for trials. The electronic databases were last searched on 12 December 2010. SELECTION CRITERIA: We included randomised trials that satisfied either of two criteria: (a) trials in which topical or oral administration of an antibiotic was compared to placebo or no treatment in people or communities with trachoma, (b) trials in which a topical antibiotic was compared with an oral antibiotic in people or communities with trachoma. A subdivision of particular interest was trials in which topical tetracycline or chlortetracycline and oral azithromycin were compared with each other, or in which one of these treatments was compared with placebo or no treatment, as these are the two WHO recommended antibiotics. We considered individually randomised and cluster-randomised trials separately. DATA COLLECTION AND ANALYSIS: Two authors independently assessed trial quality and extracted data. We contacted investigators for missing data. Where appropriate, the effect estimates from the individual studies (risk ratios) were pooled using a random-effects model. MAIN RESULTS: A total of 14 trials randomised individuals with trachoma to oral antibiotic, topical antibiotic, both, or control (no treatment or placebo) and were eligible for inclusion in this review (n = 3587). Overall, the quality of the evidence provided from these trials was low. Nine of the trials compared antibiotic treatment to control. Most of the studies found a beneficial effect of treatment on active trachoma and ocular chlamydial infection at three and 12 months follow up. There was considerable clinical and statistical heterogeneity between trials, which meant that it was difficult to reliably estimate the size of the treatment effect. It is likely to be in the region of a 20% relative risk reduction. Seven of the 14 trials compared the effectiveness of oral and topical antibiotics. There was no consistent evidence as to whether oral or topical antibiotics were more effective, although one trial suggested that a single dose of oral azithromycin was significantly more effective than unsupervised use of topical tetracyclineA further eight trials assessed the effectiveness of community-based treatment. In five trials antibiotic treatment was compared to no (or delayed) treatment (57 communities), and in three trials oral antibiotic was compared to topical treatment (12 communities). The quality of the evidence provided by these trials was variable but at least one trial was considered to provide high quality evidence. There was evidence that community-based antibiotic treatment reduced the prevalence of active trachoma and ocular infection 12 months after single-dose treatment. There was some evidence that oral azithromycin was more effective than topical tetracycline as a community treatment. Data on adverse effects were not consistently reported however there were no reported serious adverse events associated with treatment with oral azithromycin or topical tetracycline; in one sample survey of 671 people treated with azithromycin between 10% and 15% experienced gastrointestinal adverse effects (nausea or vomiting, or both). AUTHORS' CONCLUSIONS: Antibiotic treatment reduces the risk of active trachoma and ocular chlamydial infection in people infected with C. trachomatis, but we do not know for certain the size of the treatment effect in individuals. Mass antibiotic treatment with single-dose oral azithromycin reduces the prevalence of active trachoma and ocular infection in communities

Girls’ Motivation, Participation And Preference For Visual Arts Subjects In Four Senior High Schools In Central Region, Ghana

The study sought to examine girls’ motivation for and subject preferences on the Senior High School Visual Arts programme in Ghana. Using findings based on the multi-site case study research method with direct observation and interviews, the study found that 54% of 300 girls in four schools in the Central Region made personal decisions to study Visual Arts while 34% were coerced into the programme by school Heads; only 12% were inspired or persuaded. Textiles emerged the most preferred elective subject because it involves “girl-friendly” skills and offers “female-appropriate” occupations. The Textiles-with-Graphic Design elective combination facilitates access into the fashion industry but many girls shun Picture-Making because girls generally lack the level of drawing skills required; Ceramics is “girl-friendly” except that clay easily dirties their clothes. Sculpture is the least preferred elective because it demands much energy and effort, involves using sharp tools and working of heavy materials; it is therefore an “inappropriate” subject for girls. This apparent discriminatory attitude towards some Visual Arts subjects impacts negatively on girls’ academic achievement on the programme and undermines gender equality in learning, educational and career development. Effective delivery of the Visual Arts curriculum and counselling could encourage more girls to participate fully in the programme

Molecular gas in nearby low-luminosity QSO host galaxies

This paper addresses the global molecular gas properties of a representative sample of galaxies hosting low-luminosity quasistellar objects. An abundant supply of gas is necessary to fuel both the active galactic nucleus and any circum-nuclear starburst activity of QSOs. We selected a sample of nearby low-luminosity QSO host galaxies that is free of infrared excess biases. All objects are drawn from the Hamburg-ESO survey for bright UV-excess QSOs, have DEC>-30 degrees and redshifts that do not exceed z=0.06. The IRAM 30m telescope was used to measure the CO(1-0) and CO(2-1) transition in parallel. 27 out of 39 galaxies in the sample have been detected. The molecular gas masses of the detected sources range from 0.4E9 M_sun to 9.7E9 M_sun. We can confirm that the majority of galaxies hosting low-luminosity QSOs are rich in molecular gas. The properties of galaxies hosting brighter type I AGN and circumnuclear starformation regions differ from the properties of galaxies with fainter central regions. The overall supply of molecular gas and the spread of the line width distribution is larger. When comparing the far-infrared with the CO luminosities, the distribution can be separated into two different power-laws: one describing the lower activity Seyfert I population and the second describing the luminous QSO population. The separation in the L_FIR/L'_CO behavior may be explainable with differing degrees of compactness of the emission regions. We provide a simple model to describe the two power-laws. The sample studied in this paper is located in a transition region between the two populations

Dense Molecular Gas and the Role of Star Formation in the Host Galaxies of Quasi-Stellar Objects

New millimeter-wave CO and HCN observations of the host galaxies of infrared-excess Palomar Green quasi-stellar objects (PG QSOs) previously detected in CO are presented. These observations are designed to assess the validity of using the infrared luminosity to estimate star formation rates of luminous AGN by determining the relative significance of dust-heating by young, massive stars and active galactic nuclei (AGN) in QSO hosts and IRAS galaxies with warm, AGN-like infrared colors. The HCN data show the PG QSO host IZw1 and most of the warm IRAS galaxies to have high L_IR / L'_HCN (>1600) relative to the cool IRAS galaxy population for which the median L_IR / L'_HCN ~ 890(+440,-470). If the assumption is made that the infrared emission from cool IRAS galaxies is reprocessed light from embedded star-forming regions, then high values of L_IR / L'_HCN are likely the result of dust heating by the AGN. Further, if the median ratio of L'_HCN / L'_CO ~ 0.06 observed for Seyfert galaxies and IZw1 is applied to the PG QSOs not detected in HCN, then the derived L_IR / L'_HCN correspond to a stellar contribution to the production of L_IR of ~ 7-39%, and star formation rates ~ 2-37 M_sun/yr are derived for the QSO hosts. Alternatively, if the far-infrared is adopted as the star formation component of the total infrared in cool galaxies, the stellar contributions in QSO hosts to their L_FIR are up to 35% higher than the percentages derived for L_IR. This raises the possibility that the L_FIR in several of the PG QSO hosts, including IZw1, could be due entirely to dust heated by young, massive stars. Finally, there is no evidence that the global HCN emission is enhanced relative to CO in galaxies hosting luminous AGN.Comment: LaTex, 31 pages, including 9 postscript figures, AJ, in press (December 2006

The Impact of Capital Structure on Profitability of Banks Listed on the Ghana Stock Exchange

The purpose of this paper is to examine the impact of capital structure or leverage on profitability of listed banks stock exchange Ghana from 2007 to 2013. The concept of capital structure in finance explains the way a firm finances its assets/operations by the use of a blend of debt and equity. The blend of debt and equity would make banks more profitable bearing in mind the adverse effect of the extreme of each form of financing. Data was collected from Ghana stock exchange and the annual reports of the17 listed banks. Descriptive statistics and multiple regression models were used to analyze the data.  The result revealed that the banks listed on the Ghana Stock Exchange are highly geared. This can be attributed to their over dependency on short term debt which is due to the relatively high Bank of Ghana Lending rate and low level of bond market activities. The study showed that financial leverage measured by short term debt to total assets (STDTA) had significant positive relationship with profitability measured by return on assets (ROA), return on equity (ROE) and earnings per share (EPS). Long Term Debt to Total Asset (LTDTA) also had a significant positive relationship with ROA and ROE but however, had a negative and insignificant relationship with EPS. Asset growth rate had a negative and insignificant relationship with profitability measured by ROA, ROE and EPS. Firm size also showed positive and significant relation with all the profitability measures such as ROA, ROE and EPS. Keywords: Capital structure, Profitability, Multiple regression, Ghana stock exchange, Bank of Ghana

Social Determinants of Community Policing in Lurambi Sub-County, Kakamega County, Kenya

Community policing brings together the police and the community members through a partnership to prevent crime, control the crime, and solve social problems. There’s a deterioration in the level of trust, coordination and the level of crime is still high in Lurambi Sub-County. This study sought to investigate Social determinants of community policing in Lurambi Sub-County. The specific research objective was to analyze the effect of community characteristics on community policing in Lurambi Sub-County, Kenya.  The study was underpinned by the social capital theory, cognitive dissonance theory, and routine activity theory. Descriptive research design was adopted. The target population was community members in Lurambi Sub-County. The study targeted a sample of 384 community members as primary respondents. Besides, Police Officers and County law enforcement officers involved in community policing participated in the study as key informants. Stratified random sampling was used to select community members, while purposive sampling was used to select informants for the study. Primary data from community members was collected using questionnaires, while interviews and focus group discussions were used to collect secondary data. The study adopted a mixed-methods approach where quantitative and qualitative data were collected and analyzed. Study data were analyzed using the statistical package for the Social Sciences version 27 for windows. Descriptive and inferential statistics were calculated for the quantitative data, while thematic analysis was used to analyze qualitative data. Results of the study revealed a statistically significant relationship between community characteristics and community policing Lurambi Sub-County (r= 0.519; P<0.05) with a regression coefficient of determination (R2) at 0.233, implying that community characteristics accounted for 23.3% of the variance on community policing. The study findings concluded that community characteristics significantly influenced community policing. The study recommended that community policing actors and stakeholders develop policies that promote trust between the police and community members by cultivating teamwork and shared crime prevention goals since establishing and maintaining mutual trust is the central goal of community policing. Keywords: Social, Determinants, Community Policing DOI: 10.7176/PPAR/12-5-05 Publication date:July 31st 202

High-excitation molecular gas in local luminous AGN hosts

We used the mm/sub-mm receivers on the James Clerk Maxwell Telescope (JCMT) to observe the CO J=3--2, 2--1 lines in five local, optically powerful AGN and the J=4--3 line in 3C 293 (a powerful radio galaxy). Luminous CO J=3--2 emission and high CO (3--2)/(1--0) intensity ratios are found in all objects, indicating highly excited molecular gas. In 3C 293 an exceptionally bright CO J=4--3 line is found which cannot be easily explained given its quiescent star-forming environment and low AGN X-ray luminosity. In this object shocks emanating from a well-known interaction of a powerful jet with a dense ISM may be responsible for the high excitation of its molecular gas on galaxy-wide scales. Star formation can readily account for the gas excitation in the rest of the objects, although high X-ray AGN luminosities can also contribute significantly in two cases. Measuring and eventually imaging CO line ratios in local luminous QSO hosts can be done by a partially completed ALMA during its early phases of commissioning, promising a sensitive probe of starburst versus AGN activity in obscured environments at high linear resolutions.Comment: 6 pages, 1 figure, Accepted for publication in Astronomy & Astrophysic