Searches for sterile neutrinos with IceCube DeepCore

We show that study of the atmospheric neutrinos in the 10--100 GeV energy range by DeepCore sub-array of the IceCube Neutrino Observatory can substantially constrain the mixing of sterile neutrinos of mass $\sim 1$ eV with active neutrinos. In the scheme with one sterile neutrino we calculate $\nu_\mu-$ and $\bar{\nu}_\mu-$ oscillation probabilities as well as zenith angle distributions of $\nu_\mu^{CC}$ events in different energy intervals in DeepCore. The distributions depend on the mass hierarchy of active neutrinos. Therefore, in principle, the hierarchy can be identified, if $\nu_s$ exists. After a few years of exposure the DeepCore data will allow to exclude the mixing $|U_{\mu 4}|^2 \geq 0.02$ indicated by the LSND/MiniBooNE results. Combination of the DeepCore and high energy IceCube data will further improve sensitivity to $\nu_s$ mixing parameters.Comment: PDFLaTeX, 6 pages, 6 PDF figures, minor comments added, accepted in Phys. Rev.

Domestic Violence Against Women: Its Determinants and Implications for Gender Resource Allocation

Using data from a survey of Bangladeshi households, this paper explores the determinants of domestic violence against women as well as its implications for the resources allocated to women. The findings reveal that higher education of women and that of their husbands, and better socioeconomic status of households are crucial in reducing the risk of violence, while, contrary to general perceptions, women?s involvement in income generating activities and participation in NGO programmes do not have any similar effects. When resources allocated to women with and without the experiences of domestic violence are compared, no statistically significant difference between the mean calories consumed by the two groups can be found. However, there is robust evidence of women subject to domestic violence receiving significantly lower calories from the preferred food items such as, fish, meat, eggs, drinks and dairy products. Furthermore, this group of women is allocated significantly lower amounts of household food and non-food expenses compared to their counterparts who do not report domestic violence against them.domestic violence, intra-household distribution, Bangladesh

An integrated framework to classify healthcare virtual communities

Healthcare (HC) strives to improve service quality through its cost-effective social computing strategy. However, sudden rise in the count of virtual community of practices (VCoPs) introduced many choices for physicians; As a result, it is not surprising to observe current literature reporting lack of study to investigate ideas integration within and between VCoPs. VCoPs need to be categorized for HC physicians so they will be able to pin-point effective a VC to attain assistance from. This paper is one of the first investigative studies, in HC sector, that proposed a framework to classify and pin-point appropriate VCoPs, for physicians, after it reviewed and analyzed traditional and up-to-date theoretical, empirical and case study literature in the area of social computing, knowledge management (KM) and VCoPs. The implementation of this framework pinpointed professional VCoPs as most appropriate for physicians based on strict requirements, i.e. closed physician communities holding many participants, which are older than 5 years with high boundary crossing. This framework is also a “one-size-fit-all” formula to build an organizational VCoP, utilizable by other business sectors

Improvement of Pineapple Production on Tropical Peat Through Fertilizer Use

Information on the agronomic characteristics and nutritional requirements of pineapple (cv. Gandul) is lacking in peat soil. Therefore, studies in the field at two sites (site 1 and site 2), glasshouse and laboratory were carried out to investigate the effects of N, P, K, Ca, Mg and Cu on growth, yield and quality of pineapple and to assess the loss of the applied nutrients through leaching. Six levels of each of N, P, K, Ca, Mg and Cu were studied separately at each site of the field in a RCB design with three replications. In the glasshouse, three levels of each of the above nutrients were studied with soils from both sites. Leaching studies using soil columns were conducted in the laboratory with two levels of each nutrient for a period of 3 0 days. Plant height and leaf number increased with age up to forcing time at both sites. D-leaf length and area were influenced with N application, while the leaf dry weight was influenced with Mg at site 2 . The leaf nutrient concentrations were influenced by N, P, Ca and Mg at site 1 and by N, P and K applications at site 2. Leaf nutrient concentrations increased up to six months of plant age and declined at forcing at both sites. The mean fruit weight of pineapple responded quadratically with N application at both sites and with Ca at site 1 and declined linearly with the increment of P at site 2. There was no significant effect of nutrients on fruit quality except for P on sugar content at site 1 . Fruit yield was positively correlated with leaf N concentrations at both sites and negatively correlated with Cu at site 1

Does Women?s Status Matter for Food Security? Evidence from Bangladesh

Using data from a survey of Bangladeshi households, this paper investigates the link between female status and food security. Employing three different indicators of female status ? husband?s and wife?s assets brought at marriage, female share of household income and a composite index of women empowerment, the paper finds evidence of women?s status influencing food security. By raising the level of food security for some disadvantaged women?s groups female status is also found to be instrumental in mitigating the extent of gender-based within-household discrimination. The findings reveal that inferences drawn about food security by observing the changes in various non-food budget shares could be misleading or overemphasized.food security, women?s status, intra-household distribution, gender discrimination, Bangladesh

Does women's status matter for food security? Evidence from Bangladesh

Using data from a survey of Bangladeshi households, this paper investigates the link between female status and food security. Employing three different indicators of female status – husband’s and wife’s assets brought at marriage, female share of household income and a composite index of women empowerment, the paper finds evidence of women’s status influencing food security. By raising the level of food security for some disadvantaged women’s groups female status is also found to be instrumental in mitigating the extent of gender-based within-household discrimination. The findings reveal that inferences drawn about food security by observing the changes in various non-food budget shares could be misleading or overemphasized

The benefits of using a walking interface to navigate virtual environments

Navigation is the most common interactive task performed in three-dimensional virtual environments (VEs), but it is also a task that users often find difficult. We investigated how body-based information about the translational and rotational components of movement helped participants to perform a navigational search task (finding targets hidden inside boxes in a room-sized space). When participants physically walked around the VE while viewing it on a head-mounted display (HMD), they then performed 90% of trials perfectly, comparable to participants who had performed an equivalent task in the real world during a previous study. By contrast, participants performed less than 50% of trials perfectly if they used a tethered HMD (move by physically turning but pressing a button to translate) or a desktop display (no body-based information). This is the most complex navigational task in which a real-world level of performance has been achieved in a VE. Behavioral data indicates that both translational and rotational body-based information are required to accurately update one's position during navigation, and participants who walked tended to avoid obstacles, even though collision detection was not implemented and feedback not provided. A walking interface would bring immediate benefits to a number of VE applications

TeV neutrinos from core collapse supernovae and hypernovae

A fraction of core collapse supernovae of type Ib/c are associated with Gamma-ray bursts, which are thought to produce highly relativistic jets. Recently, it has been hypothesized that a larger fraction of core collapse supernovae produce slower jets, which may contribute to the disruption and ejection of the supernova envelope, and explain the unusually energetic hypernovae. We explore the TeV neutrino signatures expected from such slower jets, and calculate the expected detection rates with upcoming Gigaton Cherenkov experiments. We conclude that individual jetted SNe may be detectable from nearby galaxies.Comment: 4 pages 2 figures. Modified from the published version. Errors in Eqs. 2, 3, 5 are corrected and predicted neutrino event rates are modified accordingly. The conclusions for the diffuse flux remain unchanged, and those for individual nearby sources are strengthene

Signatures of photon and axion-like particle mixing in the gamma-ray burst jet

Photons couple to Axion-Like Particles (ALPs) or more generally to any pseudo Nambu-Goldstone boson in the presence of an external electromagnetic field. Mixing between photons and ALPs in the strong magnetic field of a Gamma-Ray Burst (GRB) jet during the prompt emission phase can leave observable imprints on the gamma-ray polarization and spectrum. Mixing in the intergalactic medium is not expected to modify these signatures for ALP mass > 10^(-14) eV and/or for < nG magnetic field. We show that the depletion of photons due to conversion to ALPs changes the linear degree of polarization from the values predicted by the synchrotron model of gamma ray emission. We also show that when the magnetic field orientation in the propagation region is perpendicular to the field orientation in the production region, the observed synchrotron spectrum becomes steeper than the theoretical prediction and as detected in a sizable fraction of GRB sample. Detection of the correlated polarization and spectral signatures from these steep-spectrum GRBs by gamma-ray polarimeters can be a very powerful probe to discover ALPs. Measurement of gamma-ray polarization from GRBs in general, with high statistics, can also be useful to search for ALPs.Comment: 17 pages, 3 figures. Accepted for publication in JCAP with minor change