10 research outputs found
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EXPLORING IN718 ALLOY PRODUCTION WITH BI-DIRECTIONAL RASTER AND STOCHASTIC SPOT MELTING TECHNIQUES USING AN OPEN-SOURCE ELECTRON MELTING SYSTEM
This study compares the fabrication of IN718 alloy using bi-directional raster and stochastic spot melting
techniques with the open-source FreemeltOne Electron Beam Melting (EBM) system. The research aimed to
produce dense parts using both scanning strategies, employing custom Python code for raster melt beam path
generation and PixelMelt software for stochastic spot melting path generation. After optimizing process
parameters, 10mm height builds for each scanning strategy were fabricated, and their microstructure, hardness,
and density were analyzed using optical microscopy and SEM, Vickers microhardness scale, and a pycnometer.
The findings reveal valuable insights into the effects of scanning strategies on the microstructure, hardness, and
density of IN718 alloy components, advancing additive manufacturing knowledge.Mechanical Engineerin
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Fatigue Endurance Investigation of Post-processed Surfaces of LPBF Ti-6Al-4V under Flexural Stress
Numerous research works can be found focusing on fatigue properties of AM components,
however most of this literature is focused on uniaxial testing. Because the very few actual
components under uniaxial loading conditions found in any application, it is also important to
investigate fatigue performance under loads that produce combined stresses, such as bending. This
project investigates the fatigue endurance of LPBF Ti-6Al-4V specimens subjected to four
different surface finishing prost-processes (milled, ground, polished and abrasive media). The test
consisted of a force-controlled cyclic load applied on the specimen in a 4-point bending setup until
fracture. The study incorporated mechanical and optical techniques to measure and quantify the
characteristic surface roughness of the post-processes. Additionally, failure mechanisms are
discussed on fractographs. The data analyses suggested that internal defects commonly present in
additively manufactured parts had a more significant impact on the fatigue life than surface
roughness of post-processed parts.Mechanical Engineerin
Media use, anti-Americanism and international support for the Iraq War
This study investigates the impact of pre-war news coverage on international support for President Bush's decision to invade Iraq in 2003. The study is based on a survey conducted one week prior to the start of the Iraq War among 1787 university students from six countries in Europe, Asia and the Middle East. The findings indicate that exposure to pre-war news coverage was associated with more positive attitudes toward Iraq and higher levels of fear related to the possible consequences of a war. Stronger international support for a US invasion correlated with more positive attitudes toward Iraq, less fear about a possible war and lower levels of anti-Americanism. Copyright © 2006 Sage Publications
Implementasi Konsep Context Awareness Pada Aplikasi Pengingat Ibadah Sunnah Di Platform Android
Penggunaan aplikasi yang terpasang pada smartphone khususnya Android saat ini sangat banyak digunakan oleh seorang muslim atau muslimah untuk menunjang kegiatan beribadah. Salah satunya, aplikasi pengingat untuk melaksanakan ibadah. Tetapi, kebanyakan aplikasi pengingat diperuntukan hanya untuk ibadah yang bersifat wajib sedangkan untuk kegiatan ibadah sunnah masih terbilang sedikit. Kekurangan lain adalah aplikasi tidak mampu memberikan pengingat untuk pengguna secara otomatis yang disesuaikan terhadap lokasi, waktu, dan aktivitas pengguna apakah telah melaksanakan ibadah atau belum. Untuk itu diperlukan konsep context-aware yang diharapkan mampu mengoptimalkan fungsi pengingat sehingga aplikasi dapat memberikan pengingat sesuai dengan aktivitas pengguna. Dengan memanfaatkan informasi konteks berupa lokasi, waktu, identitas dan aktivitas dari pengguna melalui sensor-sensor yang ada pada smartphone, aplikasi dapat mengetahui apakah pengguna telah melaksanakan ibadah atau belum. Sensor-sensor yang bisa dimanfaatkan antara lain GPS sensor, proximity sensor, light sensor dan accelerometer sensor. Tingkat efisiensi penggunaan aplikasi diuji menggunakan pengujian usabilitas dan didapatkan hasil skor SUS sebesar 74 yang termasuk ke dalam kualifikasi baik dan berhasil, kemudian dalam pengujian kompatibilitas dihasilkan aplikasi pengingat ibadah sunnah dapat berjalan dengan lancar dan tidak terjadi error pada sistem operasi Android versi Lollipop, Marshmallow, Nougat, dan Oreo
Pesudomance sp. Bacteria Associated with Marine Sponge as a Promising and Sustainable Source of Bioactive Molecules
Impact of COVID-19 on Cardiovascular Testing in the United States Versus the Rest of the World
Objectives: This study sought to quantify and compare the decline in volumes of cardiovascular procedures between the United States and non-U.S. institutions during the early phase of the coronavirus disease-2019 (COVID-19) pandemic. Background: The COVID-19 pandemic has disrupted the care of many non-COVID-19 illnesses. Reductions in diagnostic cardiovascular testing around the world have led to concerns over the implications of reduced testing for cardiovascular disease (CVD) morbidity and mortality. Methods: Data were submitted to the INCAPS-COVID (International Atomic Energy Agency Non-Invasive Cardiology Protocols Study of COVID-19), a multinational registry comprising 909 institutions in 108 countries (including 155 facilities in 40 U.S. states), assessing the impact of the COVID-19 pandemic on volumes of diagnostic cardiovascular procedures. Data were obtained for April 2020 and compared with volumes of baseline procedures from March 2019. We compared laboratory characteristics, practices, and procedure volumes between U.S. and non-U.S. facilities and between U.S. geographic regions and identified factors associated with volume reduction in the United States. Results: Reductions in the volumes of procedures in the United States were similar to those in non-U.S. facilities (68% vs. 63%, respectively; p = 0.237), although U.S. facilities reported greater reductions in invasive coronary angiography (69% vs. 53%, respectively; p < 0.001). Significantly more U.S. facilities reported increased use of telehealth and patient screening measures than non-U.S. facilities, such as temperature checks, symptom screenings, and COVID-19 testing. Reductions in volumes of procedures differed between U.S. regions, with larger declines observed in the Northeast (76%) and Midwest (74%) than in the South (62%) and West (44%). Prevalence of COVID-19, staff redeployments, outpatient centers, and urban centers were associated with greater reductions in volume in U.S. facilities in a multivariable analysis. Conclusions: We observed marked reductions in U.S. cardiovascular testing in the early phase of the pandemic and significant variability between U.S. regions. The association between reductions of volumes and COVID-19 prevalence in the United States highlighted the need for proactive efforts to maintain access to cardiovascular testing in areas most affected by outbreaks of COVID-19 infection