Factors influencing resource use by African American and African Caribbean women disclosing intimate partner violence

Many victims of intimate partner violence (IPV) do not access services. Education and severity of physical violence have previously been shown to predict resource utilization, but whether these hold true specifically among women of African descent is unknown. This article furthers our understanding of the relationship between IPV and resource use, considering sociodemographics and aspects of IPV by presenting results from a study conducted with African American and African Caribbean women in Baltimore, Maryland, and the U.S. Virgin Islands. Of the 545 women included in this analysis, 95 (18%) reported emotional abuse only, 274 (50%) reported experiencing physical abuse only, and 176 (32%) had experienced both physical and sexual abuse by an intimate partner. Resource utilization was relatively low among these women, with only 57% seeking any help. Among those who did, 13% sought medical, 18% DV, 37% community, and 41% criminal justice resources. Generalized linear model results indicated that older age and severe risk for lethality from IPV and PTSD were predictive of certain types of resource use, while education, insurance status, and depression had no influence. Perceived availability of police and shelter resources varied by site. Results suggest that systems that facilitate resource redress for all abused women are essential, particularly attending to younger clients who are less likely to seek help, while building awareness that women accessing resources may be at severe risk for lethality from the violence and may also be experiencing mental health complications. In addition, greater efforts should be made on the community level to raise awareness among women of available resources.

Measurement of the atmospheric νe flux in IceCube

We report the first measurement of the atmospheric electron neutrino flux in the energy range between approximately 80 GeV and 6 TeV, using data recorded during the first year of operation of IceCube's DeepCore low-energy extension. Techniques to identify neutrinos interacting within the DeepCore volume and veto muons originating outside the detector are demonstrated. A sample of 1029 events is observed in 281 days of data, of which 496±66(stat)±88(syst) are estimated to be cascade events, including both electron neutrino and neutral current events. The rest of the sample includes residual backgrounds due to atmospheric muons and charged current interactions of atmospheric muon neutrinos. The flux of the atmospheric electron neutrinos is consistent with models of atmospheric neutrinos in this energy range. This constitutes the first observation of electron neutrinos and neutral current interactions in a very large volume neutrino telescope optimized for the TeV energy range.

Search for dark matter annihilations in the sun with the 79-string IceCube detector

We have performed a search for muon neutrinos from dark matter annihilation in the center of the Sun with the 79-string configuration of the IceCube neutrino telescope. For the first time, the DeepCore subarray is included in the analysis, lowering the energy threshold and extending the search to the austral summer. The 317 days of data collected between June 2010 and May 2011 are consistent with the expected background from atmospheric muons and neutrinos. Upper limits are set on the dark matter annihilation rate, with conversions to limits on spin-dependent and spin-independent scattering cross sections of weakly interacting massive particles (WIMPs) on protons, for WIMP masses in the range 20-5000  GeV/c2. These are the most stringent spin-dependent WIMP-proton cross section limits to date above 35  GeV/c2 for most WIMP models.

Intimate partner violence and HIV risk factors among African-American and African-Caribbean women in clinic-based settings

Despite progress against intimate partner violence (IPV) and HIV/AIDS in the past two decades, both epidemics remain major public health problems, particularly among women of color. The objective of this study was to assess the relationship between recent IPV and HIV risk factors (sexual and drug risk behaviors, sexually transmitted infections [STIs], condom use, and negotiation) among women of African descent. We conducted a comparative case-control study in women's health clinics in Baltimore, MD, USA and St. Thomas and St. Croix, US Virgin Islands (USVI). Women aged 18-55 years who experienced physical and/or sexual IPV in the past two years (Baltimore, n=107; USVI, n=235) were compared to women who never experienced any form of abuse (Baltimore, n=207; USVI, n=119). Logistic regression identified correlates of recent IPV by site. In both sites, having a partner with concurrent sex partners was independently associated with a history of recent IPV (Baltimore, AOR: 3.91, 95% CI: 1.79-8.55 and USVI, AOR: 2.25, 95% CI: 1.11-4.56). In Baltimore, factors independently associated with recent IPV were lifetime casual sex partners (AOR: 1.99, 95% CI: 1.11-3.57), exchange sex partners (AOR: 5.26, 95% CI: 1.92-14.42), infrequent condom use during vaginal sex (AOR: 0.24, 95% CI: 0.08-0.72), and infrequent condom use during anal sex (AOR: 0.29, 95% CI: 0.09-0.93). In contrast, in the USVI, having a concurrent sex partner (AOR: 3.33, 95% CI: 1.46-7.60), frequent condom use during vaginal sex (AOR: 1.97, 95% CI: 1.06-3.65), frequent condom use during anal sex (AOR: 6.29, 95% CI: 1.57-25.23), drug use (AOR: 3.16, 95% CI: 1.00-10.06), and a past-year STI (AOR: 2.68, 95% CI: 1.25-5.72) were associated with recent IPV history. The divergent results by site warrant further investigation into the potential influence of culture, norms, and intentions on the relationships examined. Nonetheless, study findings support a critical need to continue the development and implementation of culturally tailored screening for IPV within HIV prevention and treatment programs.

SU-E-T-118: Characterization of EBT3 Films in Photon and Proton Beams

PURPOSE

To measure the calibration curves of EBT3 dosimetry films in photon and proton beams and to quantify the related uncertainties from one beam type to another.

METHODS

EBT3 Gafchromic films have similar properties than EBT2 with a symmetric construction and a matte polyester substrate to prevent Newton's ring artefacts. Films from a same batch were exposed in three different beam qualities, an Elekta SL25 6 MV photon beam, a 100 MeV 5×5cm² proton beam delivered by pencil-beam scanning dedicated system from IBA and a 60 MeV fixed proton beam (2.5cm in diameter) at Clatterbridge Center for Oncology (CCO), UK. The films were read using an EPSON 10000 XL/PRO scanner. Film calibration curves were acquired for all modalities within a range of 0.05 to 20 Gy. Influence of increasing linear-energy transfer (LET) on film response was investigated by comparing dose measured by EBT3 to a silicon diode detector in depth for a fully-modulated beam using the CCO beam line (homogeneous dose with distal end at 3.1cm in water). A comprehensive uncertainty budget (reproducibility, uniformity'¦) was estimated on films irradiated by Elekta SL25.

RESULTS

The main source of uncertainty was the non-uniformity of the scanner response. By placing all the irradiated films at the center of the scanner, the uncertainty could be reduced from 5.8% to 1.9% (1 sigma). For all beams and energies, the calibration curves were matched within uncertainties. Along the fully-modulated depth dose curve, diode and EBT3 measurement were in a 4% agreement point-to-point, indicating films weak dependence with LET.

CONCLUSIONS

The weak influence of LET, beam type and energy on film response as well as its small uncertainty make EBT3 suitable for relative dosimetry and a promising candidate for measuring correction factors (quality, recombination,'¦) for reference dosimetry with ion chambers of non-standard beams (e.g pencil-beam scanning proton-therapy). “This work is supported by the Walloon Region under the project name InVivoIGT, convention number 1017266.â€.

A Monte Carlo pencil beam scanning model for proton treatment plan simulation using GATE/GEANT4

This work proposes a generic method for modeling scanned ion beam delivery systems, without simulation of the treatment nozzle and based exclusively on beam data library (BDL) measurements required for treatment planning systems (TPS). To this aim, new tools dedicated to treatment plan simulation were implemented in the Gate Monte Carlo platform. The method was applied to a dedicated nozzle from IBA for proton pencil beam scanning delivery. Optical and energy parameters of the system were modeled using a set of proton depth-dose profiles and spot sizes measured at 27 therapeutic energies. For further validation of the beam model, specific 2D and 3D plans were produced and then measured with appropriate dosimetric tools. Dose contributions from secondary particles produced by nuclear interactions were also investigated using field size factor experiments. Pristine Bragg peaks were reproduced with 0.7 mm range and 0.2 mm spot size accuracy. A 32 cm range spread-out Bragg peak with 10 cm modulation was reproduced with 0.8 mm range accuracy and a maximum point-to-point dose difference of less than 2%. A 2D test pattern consisting of a combination of homogeneous and high-gradient dose regions passed a 2%/2 mm gamma index comparison for 97% of the points. In conclusion, the generic modeling method proposed for scanned ion beam delivery systems was applicable to an IBA proton therapy system. The key advantage of the method is that it only requires BDL measurements of the system. The validation tests performed so far demonstrated that the beam model achieves clinical performance, paving the way for further studies toward TPS benchmarking. The method involves new sources that are available in the new Gate release V6.1 and could be further applied to other particle therapy systems delivering protons or other types of ions like carbon.

Characterization of the desiccation of wheat kernels by multivariate imaging

Variations in the quality of wheat kernels can be an important problem in the cereal industry. In particular, desiccation conditions play an essential role in both the technological characteristics of the kernel and its ability to sprout. In planta desiccation constitutes a key stage in the determinism of the functional properties of seeds. The impact of desiccation on the endosperm texture of seed is presented in this work. A simple imaging system had previously been developed to acquire multivariate images to characterize the heterogeneity of food materials. A special algorithm for the use under principal component analysis (PCA) was developed to process the acquired multivariate images. Wheat grains were collected at physiological maturity, and were subjected to two types of drying conditions that induced different kinetics of water loss. A data set containing 24 images (dimensioned 702 × 524 pixels) corresponding to the different desiccation stages of wheat kernels was acquired at different wavelengths and then analyzed. A comparison of the images of kernel sections highlighted changes in kernel texture as a function of their drying conditions. Slow drying led to a floury texture, whereas fast drying caused a glassy texture. The automated imaging system thus developed is sufficiently rapid and economical to enable the characterization in large collections of grain texture as a function of time and water content.