Three-dimensional surface reconstruction for cartridge cases using photometric stereo

In forensic science, automated firearms identification is an important and yet unsolved problem. On the way to the solution, one of the most important phases is data acquisition. To be able to identify firearms in a reliable way, all the striated and impressed marks on metallic surfaces of cartridge cases should be visible. But two-dimensional images of cartridge cases are very sensitive to the type and direction of the light source(s). Depending on illumination conditions, the images of marks change drastically and sometimes they simply disappear. But, if the three-dimensional (3D) topography of the surface is obtained, the geometry of the marks, which is independent of the illumination, is available. Thus, by providing illumination independent features that can be used for automated matching, 3D data have the potential to make automated matching much reliable. In the literature on data acquisition for automated firearms identification, a few different ways of three-dimensional surface extraction are described, like laser interferometry or laser profilometry. This study presents a real life application of another method, photometric stereo, for the acquisition of 3D topographic data for cartridge cases, which is the one used in BALISTIKA Ballistics Image Analysis and Recognition System. In order to construct 3D topographic data, first of all, two-dimensional images were acquired using a specially designed set-up. After the images were calibrated radiometrically, photometric stereo method was applied. In order to minimize the low-frequency errors in the final surface, a surface-fitting algorithm was used. The method uses low-cost equipment and image acquisition is not time-consuming. Results were compared to interferometric measurement values for error assessment.     

Unnecessary bleeding,unnecessary suffering: normalcy and necessity of menstruation in promoting NovaSure®

NovaSure® is an endometrial ablation procedure that destroys the inner lining of uterus to stop heavy bleeding. It is performed mostly on women entering menopause who are experiencing irregular and heavy bleeding. In this article, this biotechnology, promoted for women approaching the end of their reproductive life, is analyzed. The analysis is informed by a feminist science studies and medical anthropology background. The discourse of ‘normal’ menstruation and representations of menstruation in the promotional materials for NovaSure® are explored through a textual analysis of the NovaSure® website and patient brochure. The themes in the materials analyzed include the idea of getting back to life, ‘normal’ bleeding, and having a choice among different medical procedures and interventions. The possibility of getting rid of embarrassment that accompanies heavy bleeding is also emphasized. It will be argued that NovaSure® contributes to the redefinition of what is ‘natural’ and ‘necessary’ by combining the ‘unnecessary period’ idea of pills such as Seasonale®, which is aimed toward women in their reproductive years, with the ‘unnecessary suffering’ idea related to menopausal complaints. While advertising the procedure, NovaSure® promotional materials co-construct the ideal user for the technology and reproduce the taboos and embarrassment that accompany menstruation.     

Electronic Voting in Belgium: A Legitimised Choice?

Computer voting was introduced in Belgium in 1994. Paradoxically, no action had been taken to ascertain the opinion of electors confronted with this original method of voting. This article verifies the social and empirical dimensions of legitimacy of this new method through several empirical indicators used in a survey conducted on the occasion of the federal elections of 18 May 2003: (a) how easy/difficult it was for electors to vote on a computer; (b) to what extent they trust voting on a computer; (c) if they have a philosophical/social opposition to voting on a computer.     

Nitrate and Nitrite Determination in Gunshot Residue Samples by Capillary Electrophoresis in Acidic Run Buffer,

Simultaneous determination of nitrate and nitrite in gunshot residue has been conducted by capillary electrophoresis using an acidic run buffer (pH 3.5). In previously developed capillary electrophoretic methods, alkaline pH separation buffers were used where nitrite and nitrate possess similar electrophoretic mobility. In this study, the electroosmotic flow has been reversed by using low pH running buffer without any additives. As a result of reversing the electroosmotic flow, very fast analysis has been actualized, well‐defined and separated ion peaks emerge in less than 4 min. Besides, the limit of detection was improved by employing large volume sample stacking. Limit of detection values were 6.7 and 4.3 μM for nitrate and nitrite, respectively. In traditional procedure, mechanical agitation is employed for extraction, while in this work the extraction efficiency of ultrasound mixing for 30 min was found sufficient. The proposed method was successfully applied to authentic gunshot residue samples.