Non-contact measurement of the thickness of a surface film using a superimposed ultrasonic standing wave

Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and received the waves that bounced off the front face. The magnitude of the reflected wave was dependent on the film thickness at the front face. Most pulse-echo ultrasonic approaches use the time-of-flight through the surface layer to determine its thickness. However, as the film becomes thinner, the reflected echoes overlap and there is often an acoustic mismatch between the solid and the surface film that reduces the signal strength. In this work, we propose the use of an ultrasonic continuously repeated chirp longitudinal wave to amplify the effect of the surface film. Multiple reflections interfere within the solid to form a superimposed standing wave whose amplitude spectrum is highly dependent on the surface film thickness thus overcoming the acoustic mismatch problem. Two bare 10 MHz piezoelectric elements were bonded to a 10 mm thick aluminium solid in a pitch-catch arrangement such that one continuously sends repeating chirp ultrasound waves and the other acts as the receiver. The transmitter was set to send a repeating chirp wave of 4 ms duration corresponding to the bandwidth of the transducer in order to maximise signal amplitude. The incident and reflected waves constructively and destructively interfere to form a superimposed standing wave within the solid. The solid/surface film to solid/air boundary condition frequency spectra ratio showed the film resonant frequency modes as minima. Using this technique epoxy coatings ranging from 70 μm to 350 μm were measured and showed a good correlation with independent measurements using a surface profilometer

A Systematic Review of Criminal Justice Initiatives to Strengthen the Criminal Investigation and Prosecution of Sexual Violence in East Africa.

Sexual violence (SV) is a widespread public health and human rights problem, with countries in East Africa having higher rates than the global average. Prosecutions of SV in East Africa are rare, and survivors face many challenges accessing medico-legal justice and services. Developing initiatives that support survivors in navigating the criminal justice system is vital, yet there is limited research on efforts to improve the criminal justice system's management and treatment of survivors. We conducted a scoping review of research on initiatives to strengthen responses toward investigating and prosecuting cases. We identified 25 academic articles and reports through a search of electronic databases and gray literature that address these initiatives in East Africa. The results reveal that seven types of initiatives have been studied: one-stop centers (OSCs), multisectoral referral networks, gender desks, community interventions, mobile applications, and specialized police and prosecution units. Upon review, we found that barriers to success include a lack of resources and facilities, a lack of trained health care, police, and judicial personnel to perform services, weak medico-legal partnerships, and stigma and impunity restricting the uptake and fair distribution of services. Overall, limited systematic evidence on the effectiveness and adaptability of initiatives exists, showing that SV interventions in East Africa remain an under-researched and under-resourced area, and need greater scientific rigor to inform practice and coordinated advocacy. This review is a call to action for policy makers and service providers working in East Africa-and for international bodies working toward achieving Sustainable Development Goals 5-to improve criminal justice initiatives

Urgent issues and prospects at the intersection of culture, memory, and witness interviews: Exploring the challenges for research and practice

Funder: UK Home Office and security and intelligence agenciesFunder: KU Leuven; Id: http://dx.doi.org/10.13039/501100004040Funder: FWO Research ProjectAbstract: The pursuit of justice increasingly relies on productive interactions between witnesses and investigators from diverse cultural backgrounds during investigative interviews. To date, the role of cultural context has largely been ignored by researchers in the field of investigative interviewing, despite repeated requests from practitioners and policymakers for evidence‐based guidance for the conduct of interviews with people from different cultures. Through examining cultural differences in human memory and communication and considering specific contextual challenges for investigative interviewing through the lens of culture, this review and associated commentaries highlight the scope for considering culture and human diversity in research on, and the practice of, investigative interviewing with victims, witnesses, and other sources. Across 11 commentaries, contributors highlight the importance of considering the role of culture in different investigative interviewing practices (e.g., rapport building, questioning techniques) and contexts (e.g., gender‐based violence, asylum seeking, child abuse), address common areas of cultural mismatch between interviewer–interviewee expectations, and identify critical future routes for research. We call for an increased focus in the investigative interviewing literature on the nature and needs of our global community and encourage constructive and collaborative discussion between researchers and practitioners from around the world to better identify specific challenges and work together towards evidence‐based solutions

Termination of the leprosy isolation policy in the US and Japan : Science, policy changes, and the garbage can model

BACKGROUND: In both the US and Japan, the patient isolation policy for leprosy /Hansen's disease (HD) was preserved along with the isolation facilities, long after it had been proven to be scientifically unnecessary. This delayed policy termination caused a deprivation of civil liberties of the involuntarily confined patients, the fostering of social stigmas attached to the disease, and an inefficient use of health resources. This article seeks to elucidate the political process which hindered timely policy changes congruent with scientific advances. METHODS: Examination of historical materials, supplemented by personal interviews. The role that science played in the process of policy making was scrutinized with particular reference to the Garbage Can model. RESULTS: From the vantage of history, science remained instrumental in all period in the sense that it was not the primary objective for which policy change was discussed or intended, nor was it the principal driving force for policy change. When the argument arose, scientific arguments were employed to justify the patient isolation policy. However, in the early post-WWII period, issues were foregrounded and agendas were set as the inadvertent result of administrative reforms. Subsequently, scientific developments were more or less ignored due to concern about adverse policy outcomes. Finally, in the 1980s and 1990s, scientific arguments were used instrumentally to argue against isolation and for the termination of residential care. CONCLUSION: Contrary to public expectations, health policy is not always rational and scientifically justified. In the process of policy making, the role of science can be limited and instrumental. Policy change may require the opening of policy windows, as a result of convergence of the problem, policy, and political streams, by effective exercise of leadership. Scientists and policymakers should be attentive enough to the political context of policies

Non-contact measurement of the thickness of a surface film using a superimposed ultrasonic standing wave

This data provides the reader with a sample of raw data and processed data which was used for the measurement of surface film thickness using a superimposed ultrasonic standing wave. The reader is advised to refer to the research article "Non-contact measurement of the thickness of a surface film using a superimposed ultrasonic standing wave" for more information on this data and how to interpret it

Non-contact measurement of the thickness of a surface film using a superimposed ultrasonic standing wave

This data provides the reader with a sample of raw data and processed data which was used for the measurement of surface film thickness using a superimposed ultrasonic standing wave. The reader is advised to refer to the research article "Non-contact measurement of the thickness of a surface film using a superimposed ultrasonic standing wave" for more information on this data and how to interpret it