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https://www.readbyqxmd.com/read/28806543/200%C3%A2-kev-cold-field-emission-source-using-carbon-cone-nanotip-application-to-scanning-transmission-electron-microscopy
#1
Shuichi Mamishin, Yudai Kubo, Robin Cours, Marc Monthioux, Florent Houdellier
We report the use of a pyrolytic carbon cone nanotip as field emission cathode inside a modern 200 kV dedicated scanning transmission electron microscope. We show an unprecedented improvement in the probe current stability while maintaining all the fundamental properties of a cold field emission source such as a small angular current density together with a high brightness. We have also studied the influence of the low extraction voltage, as enabled by the nanosized apex of the cones, on the electron optics properties of the source that prevent the formation of a virtual beam cross-over of the gun...
August 9, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28804961/gaseous-nanocarving-mediated-carbon-framework-with-spontaneous-metal-assembly-for-structure-tunable-metal-carbon-nanofibers
#2
Dae-Hyun Nam, Sungwoo Lee, Young-Joo Lee, Jun-Hyun Jo, Euijoon Yoon, Kyung-Woo Yi, Gun-Do Lee, Young-Chang Joo
Vapor phase carbon (C)-reduction-based syntheses of C nanotubes and graphene, which are highly functional solid C nanomaterials, have received extensive attention in the field of materials science. This study suggests a revolutionary method for precisely controlling the C structures by oxidizing solid C nanomaterials into gaseous products in the opposite manner of the conventional approach. This gaseous nanocarving enables the modulation of inherent metal assembly in metal/C hybrid nanomaterials because of the promoted C oxidation at the metal/C interface, which produces inner pores inside C nanomaterials...
August 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28800365/the-impact-of-the-orlando-mass-shooting-on-fear-of-victimization-and-gun-purchasing-intentions-not-what-one-might-expect
#3
Wolfgang Stroebe, N Pontus Leander, Arie W Kruglanski
Mass public shootings are typically followed by a spike in gun sales as well as calls for stricter gun control laws. What remains unclear is whether the spike in gun sales is motivated by increased threat perceptions or by concerns about gun control, or whether the sales are mainly driven by non-owners purchasing guns or gun owners adding to their collection. Two surveys of gun owners and non-owners, conducted immediately before and after the Orlando shooting, allowed us to assess its impact on threat perceptions and on gun-purchasing intentions...
2017: PloS One
https://www.readbyqxmd.com/read/28796429/comparison-of-time-to-obtain-intraosseous-versus-jugular-venous-catheterization-on-canine-cadavers
#4
Alison R Allukian, Amanda L Abelson, Jonathan Babyak, Elizabeth A Rozanski
OBJECTIVE: To compare the time required and the success rate of personnel with 4 different levels of experience to place a humeral intraosseous (IO) catheter versus a jugular venous catheter (IV) in cadaver dogs. DESIGN: Prospective study. SETTING: Veterinary university teaching hospital. INTERVENTIONS: Canine cadavers from recently euthanized dogs were obtained from the cadaver donation program between May and December 2014...
August 10, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28795038/indentation-in-the-right-ventricle-by-an-incomplete-pericardium-on-3-dimensional-reconstructed-computed-tomography
#5
Hak Ju Kim, Jae Gun Kwak
We report the case of a 17-year-old girl who presented with an indentation in the right ventricle caused by an incomplete pericardium on preoperative 3-dimensional reconstructed computed tomography. She was to undergo surgery for a partial atrioventricular septal defect and secundum atrial septal defect. Preoperative electrocardiography revealed occasional premature ventricular beats. We found the absence of the left side of the pericardium intraoperatively, and this absence caused strangulation of the diaphragmatic surface of the right ventricle...
August 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28794817/rapid-chemical-free-breaking-of-microfluidic-emulsions-with-a-hand-held-antistatic-gun
#6
Mohsen Karbaschi, Payam Shahi, Adam R Abate
Droplet microfluidics can form and process millions of picoliter droplets with speed and ease, allowing the execution of huge numbers of biological reactions for high-throughput studies. However, at the conclusion of most experiments, the emulsions must be broken to recover and analyze their contents. This is usually achieved with demulsifiers, like perfluorooctanol and chloroform, which can interfere with downstream reactions and harm cells. Here, we describe a simple approach to rapidly and efficiently break microfluidic emulsions, which requires no chemicals...
July 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28792916/penetrating-injury-from-plastic-airsoft-pellet-shows-beam-hardening-artifact-on-computer-tomography
#7
Divakar Gupta, Tina D Tailor, Courtney Francis, Kalpana Kanal, Todd Klesert
PURPOSE: To describe a case of left eye corneal perforation, cataract, hyphema, and intraocular foreign body after airsoft pellet injury. METHODS: The authors reviewed the medical history and diagnostic imaging of a 12-year-old boy injured by a pellet from an airsoft gun. Typically, plastic airsoft pellets cause blunt trauma to the globe, which can lead to visual disability from corneal abrasion or hyphema. Initial computed tomography of the left orbit showed a 6...
December 19, 2016: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28791272/laparoscopic-repair-of-a-rectal-fistula-due-to-a-benign-ovarian-dermoid-cyst
#8
Ji Hye Kim, Gun Oh Chong, Da Som Chun, Soo Yeun Park, Yoon Hee Lee, Dae Gy Hong
Ovarian dermoid cysts are one of the most common benign neoplasms in women. Rectal fistula formation due to an ovarian dermoid cyst, particularly a benign dermoid cyst, is extremely rare. A 17-year-old girl with symptoms of lower abdominal pain, passage of sebaceous materials in the stool, and hematochezia was found to have an 11-cm dermoid cyst complicated with a rectal fistula formation. Laparoscopic repair of the rectal fistula was performed successfully with bilateral ovarian cystectomies. This case presents the rare formation of a fistula between a benign dermoid cyst and the rectum and its treatment using laparoscopic repair without laparotomy...
July 2017: Obstetrics & Gynecology Science
https://www.readbyqxmd.com/read/28782022/high-thermal-conductivity-in-electrostatically-engineered-amorphous-polymers
#9
Apoorv Shanker, Chen Li, Gun-Ho Kim, David Gidley, Kevin P Pipe, Jinsang Kim
High thermal conductivity is critical for many applications of polymers (for example, packaging of light-emitting diodes), in which heat must be dissipated efficiently to maintain the functionality and reliability of a system. Whereas uniaxially extended chain morphology has been shown to significantly enhance thermal conductivity in individual polymer chains and fibers, bulk polymers with coiled and entangled chains have low thermal conductivities (0.1 to 0.4 W m(-1) K(-1)). We demonstrate that systematic ionization of a weak anionic polyelectrolyte, polyacrylic acid (PAA), resulting in extended and stiffened polymer chains with superior packing, can significantly enhance its thermal conductivity...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28781982/influence-of-cathode-geometry-on-electron-dynamics-in-an-ultrafast-electron-microscope
#10
Shaozheng Ji, Luca Piazza, Gaolong Cao, Sang Tae Park, Bryan W Reed, Daniel J Masiel, Jonas Weissenrieder
Efforts to understand matter at ever-increasing spatial and temporal resolutions have led to the development of instruments such as the ultrafast transmission electron microscope (UEM) that can capture transient processes with combined nanometer and picosecond resolutions. However, analysis by UEM is often associated with extended acquisition times, mainly due to the limitations of the electron gun. Improvements are hampered by tradeoffs in realizing combinations of the conflicting objectives for source size, emittance, and energy and temporal dispersion...
September 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28780711/percutaneous-removal-of-intravascular-pellet-following-penetrating-cardiac-trauma
#11
Joshua D Chew, George T Nicholson, Bret A Mettler, Thomas P Doyle
There is controversy regarding the management of projectile embolization, a rare complication of penetrating trauma. We present the case of a 5-year-old, 20 kg male with retrograde venous projectile embolization following traumatic injury with a pellet gun. The projectile was successfully removed utilizing a novel, percutaneous approach.
August 5, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28780436/particle-emission-rates-during-electrostatic-spray-deposition-of-tio2-nanoparticle-based-photoactive-coating
#12
Antti J Koivisto, Alexander C Ø Jensen, Kirsten I Kling, Jens Kling, Hans Christian Budtz, Ismo K Koponen, Ilse Tuinman, Tareq Hussein, Keld A Jensen, Asger Nørgaard, Marcus Levin
Here, we studied the particle release rate during Electrostatic spray deposition of anatase-(TiO2)-based photoactive coating onto tiles and wallpaper using a commercially available electrostatic spray device. Spraying was performed in a 20.3m(3) test chamber while measuring concentrations of 5.6nm to 31μm-size particles and volatile organic compounds (VOC), as well as particle deposition onto room surfaces and on the spray gun user hand. The particle emission and deposition rates were quantified using aerosol mass balance modelling...
July 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28777997/italian-nursing-students-and-professional-socialisation-response-to-the-commentary-bagnasco-a-aleo-g-timmins-f-devries-j-bressan-v-bianchi-m-and-sasso-l-the-800-pound-gorilla-and-the-smoking-gun-a-response-to-sabatino-et%C3%A2-al-2015-regarding-italian-nurse-education
#13
https://www.readbyqxmd.com/read/28776351/the-utility-of-preliminary-patient-evaluation-in-a-febrile-respiratory-infectious-disease-unit-outside-the-emergency-department
#14
Jun Sik Kang, Byung Woo Jhun, Hee Yoon, Seong Mi Lim, Eunsil Ko, Joo Hyun Park, Sung Yeon Hwang, Se Uk Lee, Tae Rim Lee, Won Chul Cha, Tae Gun Shin, Min Seob Sim, Ik Joon Jo
A febrile respiratory infectious disease unit (FRIDU) with a negative pressure ventilation system was constructed outside the emergency department (ED) of the Samsung Medical Center in 2015, to screen for patients with contagious diseases requiring isolation. We evaluated the utility of the FRIDU during 1 year of operation. We analyzed 1,562 patients who were hospitalized after FRIDU screening between August 2015 and July 2016. The level of isolation recommended during their screening at the FRIDU was compared with the level deemed appropriate given their final diagnosis...
September 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28775332/temporally-robust-eye-movements-through-task-priming-and-self-referential-stimuli
#15
Eun-Soo Jung, Dong-Gun Lee, Kyeongho Lee, Soo-Young Lee
Studies have demonstrated connections between eye movements and attention shifts. However, little is known about the general factors that contribute to the self-consistency of idiosyncratic scanpaths as a function of attention shifts over time. The present work repeatedly measured human eye movements at various time intervals that ranged from less than one hour to one year between recording sessions. With and without task context, subjects observed multiple images with multiple areas of interest, including their own sporadically interspersed facial images...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28774161/suggestions-on-improvement-of-infectious-disease-law-and-regulations
#16
Mijeong Park
Purpose: The study's perspective is through examining an enactment for the New amendment for legislation, to make proposals for a more rational and concrete basis in the interpretation and application of the Korean legal regime in global infectious disease emergency situations. Methods: The Republic of Korea reported its first laboratory-confirmed case of Middle East Respiratory Syndrome Corona Virus (MERS-CoV) on 20 May 2015. Since the first index case, Korean public health authorities enforced many public health measures that were not authorized in the law...
July 25, 2017: Epidemiology and Health
https://www.readbyqxmd.com/read/28773237/direct-synthesis-of-carbon-nanotube-field-emitters-on-metal-substrate-for-open-type-x-ray-source-in-medical-imaging
#17
Amar Prasad Gupta, Sangjun Park, Seung Jun Yeo, Jaeik Jung, Chonggil Cho, Sang Hyun Paik, Hunkuk Park, Young Chul Cho, Seung Hoon Kim, Ji Hoon Shin, Jeung Sun Ahn, Jehwang Ryu
We report the design, fabrication and characterization of a carbon nanotube enabled open-type X-ray system for medical imaging. We directly grew the carbon nanotubes used as electron emitter for electron gun on a non-polished raw metallic rectangular-rounded substrate with an area of 0.1377 cm² through a plasma enhanced chemical vapor deposition system. The stable field emission properties with triode electrodes after electrical aging treatment showed an anode emission current of 0.63 mA at a gate field of 7...
July 29, 2017: Materials
https://www.readbyqxmd.com/read/28772741/effect-of-the-fabrication-parameters-of-the-nanosphere-lithography-method-on-the-properties-of-the-deposited-au-ag-nanoparticle-arrays
#18
Jing Liu, Chaoyang Chen, Guangsong Yang, Yushan Chen, Cheng-Fu Yang
The nanosphere lithography (NSL) method can be developed to deposit the Au-Ag triangle hexagonal nanoparticle arrays for the generation of localized surface plasmon resonance. Previously, we have found that the parameters used to form the NSL masks and the physical methods required to deposit the Au-Ag thin films had large effects on the geometry properties of the nanoparticle arrays. Considering this, the different parameters used to grow the Au-Ag triangle hexagonal nanoparticle arrays were investigated. A single-layer NSL mask was formed by using self-assembly nano-scale polystyrene (PS) nanospheres with an average radius of 265 nm...
April 3, 2017: Materials
https://www.readbyqxmd.com/read/28771306/electron-donor-and-acceptor-agents-responsible-for-surface-modification-optimizing-electrochemical-performance
#19
Wail Al Zoubi, Muhammad Prisla Kamil, Haewoong Yang, Young Gun Ko
The electrochemical roles of electron donor and acceptor agents on surface reforming of magnesium alloy were investigated via plasma electrolysis. The surface modification was performed in the aluminate-based electrolyte having urea and hydrazine with inherent molecular structures which might play as electron acceptor and donor during plasma-assisted electrochemical reaction. The presence of hydrazine working as donor would promote the formation of magnesium aluminates in the oxide layer, resulting in superior compactness of the oxide layer to the case when urea working as acceptor was used since the precipitation of MgCO3 was favored in the electrolyte with urea...
August 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28771304/non-sacrificial-template-synthesis-of-magnetic-based-yolk-shell-nanostructures-for-the-removal-of-acetaminophen-in-fenton-like-systems
#20
Quoc Cuong Do, Do-Gun Kim, Seok-Oh Ko
Recently, yolk-shell structured materials with active metal cores have received considerable attention in heterogeneous Fenton-like systems, which have excellent catalytic performance. In this study, we initially attempted the non-sacrificial template synthesis of yolk-shell structured nanoparticles with magnetite cores encapsulated in a mesoporous silica shell (Fe3O4@SiO2) via a modified sol-gel process, and then evaluated their catalytic activity for acetaminophen degradation in Fenton-like systems. Secondly, copper nanoparticles were decorated on the surface of the Fe3O4@SiO2 microspheres (Fe3O4@SiO2@Cu) in order to enhance the catalytic activity...
August 3, 2017: ACS Applied Materials & Interfaces
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