Fertility and union dissolution in Brazil: an example of multi-process modelling using the Demographic and Health Survey calendar data

This study examines the union and conception histories of Brazilian women aged 15-49 using the 1996 Demographic and Health Survey’s calendar data. The aim of the paper is twofold: firstly to explore the use of union histories in the DHS calendar data, which have not yet been used for union dynamics studies and secondly to secondly to analyse the relationship between union instability and fertility in Brazil which has been long understudied. Using the example of Brazil it investigates the potential strengths and biases of this data source. In particular it analyses the impact of union dissolution on fertility in Brazil using multiprocess event history analysis techniques as developed by Lillard (1993). This type of methodology has been widely used for the analyses of developed countries data. However, it has not been explored for developing countries mainly due to the lack of data. The paper will demonstrate the positive effect of union instability on fertility.aml, Brazil, calendar data, DHS, fertility, multiprocess model, union dissolution

Fertility and union dissolution in Brazil: an example of multi-process modelling using the Demographic and Health Survey calendar data.

This study examines the union and conception histories of Brazilian women aged 15-49 using the 1996 Demographic and Health Survey’s calendar data. The aim of the paper is twofold: firstly to explore the use of union histories in the DHS calendar data, which have not yet been used for union dynamics studies and secondly to secondly to analyse the relationship between union instability and fertility in Brazil which has been long understudied. Using the example of Brazil it investigates the potential strengths and biases of this data source. In particular it analyses the impact of union dissolution on fertility in Brazil using multiprocess event history analysis techniques as developed by Lillard (1993). This type of methodology has been widely used for the analyses of developed countries data. However, it has not been explored for developing countries mainly due to the lack of data. The paper will demonstrate the positive effect of union instability on fertility.

An existential-phenomenological investigation of the experience of gay men acknowledging to themselves that they are attracted to other men

There are an abundance of studies regarding the development of sexual identity and sexual orientation that have served as the foundational underpinnings for exploring sexual orientation development. To date, however, findings from these studies have failed to constitute a significant resource for understanding the gay man’s experience of acknowledging to himself that he is attracted to other men. By identifying the essential constituents of this experience, this existential phenomenological study provides a starting point for further exploration. Written narrative accounts were obtained from seven men who identified sexually as gay and a method of existential-phenomenological analysis was applied to reveal the prereflective constituents of the experience described. The analysis yielded a new perspective on the experience of gay men and their attraction to other men that has the capacity to change the way practising clinicians, educators, counsellors and future researchers treat and understand the Queer community

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region.

We present a table-top beamline providing a soft X-ray supercontinuum extending up to 370 eV from high-order harmonic generation with sub-13 fs 1300 nm driving pulses and simultaneous production of sub-5 fs pulses centered at 800 nm. Optimization of high harmonic generation in a long and dense gas medium yields a photon flux of  ~ 1.4 × 106 photons/s/1% bandwidth at 300 eV. The temporal resolution of X-ray transient absorption experiments with this beamline is measured to be 11 fs for 800 nm excitation. This dual-wavelength approach, combined with high flux and high spectral and temporal resolution soft X-ray absorption spectroscopy, is a new route to the study of ultrafast electronic dynamics in carbon-containing molecules and materials at the carbon K-edge

Implementation of a Matrix Crack Spacing Parameter in a Continuum Damage Mechanics Finite Element Model

Continuum Damage Mechanics (CDM) based progressive damage and failure analysis (PDFA) methods have demonstrated success in a variety of finite element analysis (FEA) implementations. However, the technical maturity of CDM codes has not yet been proven for the full design space of composite materials in aerospace applications. CDM-based approaches represent the presence of damage by changing the local material stiffness definitions and without updating the original mesh or element integration schemes. Without discretely representing cracks and their paths through the mesh, damage in models with CDM-based materials is often distributed in a region of partially damaged elements ahead of stress concentrations. Having a series of discrete matrix cracks represented by a softened region may affect predictions of damage propagation and, thus, structural failure. This issue can be mitigated by restricting matrix damage development to discrete, fiber-aligned rows of elements; hence CDM-based matrix cracks can be implemented to be more representative of discrete matrix cracks. This paper evaluates the effect of restricting CDM matrix crack development to discrete, fiber-aligned rows where the spacing of these rows is controlled by a user-defined crack spacing parameter. Initially, the effect of incrementally increasing matrix crack spacing in a unidirectional center notch coupon is evaluated. Then, the lessons learned from the center notch specimen are applied to open-hole compression finite element models. Results are compared to test data, and the limitations, successes, and potential of the matrix crack spacing approach are discussed

T-Cap Pull-Off and Bending Behavior for Stitched Structure

The Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) is a structural concept that was developed by The Boeing Company to address the complex structural design aspects associated with a pressurized hybrid wing body aircraft configuration. An important design feature required for assembly is the integrally stitched T-cap, which provides connectivity of the corner (orthogonal) joint between adjacent panels. A series of tests were conducted on T-cap test articles, with and without a rod stiffener penetrating the T-cap web, under tension (pull-off) and bending loads. Three designs were tested, including the baseline design used in largescale test articles. The baseline had only the manufacturing stitch row adjacent to the fillet at the base of the T-cap web. Two new designs added stitching rows to the T-cap web at either 0.5- or 1.0-inch spacing along the height of the web. Testing was conducted at NASA Langley Research Center to determine the behavior of the T-cap region resulting from the applied loading. Results show that stitching arrests the initial delamination failures so that the maximum strength capability exceeds the load at which the initial delaminations develop. However, it was seen that the added web stitching had very little effect on the initial delamination failure load, but actually decreased the initial delamination failure load for tension loading of test articles without a stiffener passing through the web. Additionally, the added web stitching only increased the maximum load capability by between 1% and 12.5%. The presence of the stiffener, however, did increase the initial and maximum loads for both tension and bending loading as compared to the stringerless baseline design. Based on the results of the few samples tested, the additional stitching in the T-cap web showed little advantage over the baseline design in terms of structural failure at the T-cap web/skin junction for the current test articles

Tension and Bending Testing of an Integral T-Cap for Stitched Composite Airframe Joints

The Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) is a structural concept that was developed by The Boeing Company to address the complex structural design aspects associated with a pressurized hybrid wing body aircraft configuration. An important design feature required for assembly is the integrally stitched T-cap, which provides connectivity of the corner (orthogonal) joint between adjacent panels. A series of tests were conducted on T-cap test articles, with and without a rod stiffener penetrating the T-cap web, under tension (pull-off) and bending loads. Three designs were tested, including the baseline design used in large-scale test articles. The baseline had only the manufacturing stitch row adjacent to the fillet at the base of the T-cap web. Two new designs added stitching rows to the T-cap web at either 0.5- or 1.0-inch spacing along the height of the web. Testing was conducted at NASA Langley Research Center to determine the behavior of the T-cap region resulting from the applied loading. Results show that stitching arrests the initial delamination failures so that the maximum strength capability exceeds the load at which the initial delaminations develop. However, it was seen that the added web stitching had very little effect on the initial delamination failure load, but actually decreased the initial delamination failure load for tension loading of test articles without a stiffener passing through the web. Additionally, the added web stitching only increased the maximum load capability by between 1% and 12.5%. The presence of the stiffener, however, did increase the initial and maximum loads for both tension and bending loading as compared to the stringerless baseline design. Based on the results of the few samples tested, the additional stitching in the T-cap web showed little advantage over the baseline design in terms of structural failure at the T-cap web/skin junction for the current test articles

A Continuum Damage Mechanics Model to Predict Kink-Band Propagation Using Deformation Gradient Tensor Decomposition

A new model is proposed that represents the kinematics of kink-band formation and propagation within the framework of a mesoscale continuum damage mechanics (CDM) model. The model uses the recently proposed deformation gradient decomposition approach to represent a kink band as a displacement jump via a cohesive interface that is embedded in an elastic bulk material. The model is capable of representing the combination of matrix failure in the frame of a misaligned fiber and instability due to shear nonlinearity. In contrast to conventional linear or bilinear strain softening laws used in most mesoscale CDM models for longitudinal compression, the constitutive response of the proposed model includes features predicted by detailed micromechanical models. These features include: 1) the rotational kinematics of the kink band, 2) an instability when the peak load is reached, and 3) a nonzero plateau stress under large strains

Financial Statement Complexity and Bank Lending

Recent studies and anecdotal evidence suggest that investors struggle to process complex financial reports. Existing theory and evidence demonstrate that banks not only have unique advantages in acquiring information, relative to equity and public debt investors, but also can impose contractual terms to mitigate information frictions. We investigate whether financial statement complexity is associated with firms' reliance on bank financing and with the terms of bank loans (i.e., the amount and rate of the loan, along with covenants and collateral). We focus on two dimensions of complexity that capture the volume and presentation of financial information: 10-K length and readability. We find that complexity is positively associated both with firms' reliance on bank financing and with banks increasing their level of screening, rationing their credit supply, and imposing tighter covenants. Our results suggest that banks continue to play their role as informed capital providers in a changing economy, characterized by growing financial statement complexity and innovations in banks' business models