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https://www.readbyqxmd.com/read/28214757/staining-in-firearm-barrels-after-experimental-contact-shots
#1
C Schyma, K Bauer, J Brünig, C Courts, B Madea
After contact shots to the head biological traces inside firearm barrels can be found. This study was conducted to simulate and to evaluate such staining. Five current handguns of four inch barrel length in the calibre .22 long rifle, 7.65mm Browning, 9mm Luger and .38 special were used to perform 24 contact shots on silicone coated, gelatine filled box models using the triple contrast method. The staining was documented by endoscopy and swabs gathered from both ends of the barrel were analysed by quantitative PCR...
February 10, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28214368/evaluation-of-deformable-image-registration-between-external-beam-radiotherapy-and-hdr-brachytherapy-for-cervical-cancer-with-a-3d-printed-deformable-pelvis-phantom
#2
Noriyuki Kadoya, Yuya Miyasaka, Yujiro Nakajima, Yoshihiro Kuroda, Kengo Ito, Mizuki Chiba, Kiyokazu Sato, Suguru Dobashi, Takaya Yamamoto, Noriyoshi Takahashi, Masaki Kubozono, Ken Takeda, Keiichi Jingu
PURPOSE: In this study, we developed a 3D-printed deformable pelvis phantom for evaluating spatial DIR accuracy. We then evaluated the spatial DIR accuracies of various DIR settings for cervical cancer. METHODS: A deformable female pelvis phantom was created based on patient CT data using 3D printing. To create the deformable uterus phantom, we first 3D printed both a model of uterus and a model of the internal cavities of the vagina and uterus. We then made a mold using the 3D printed uterus phantom...
February 18, 2017: Medical Physics
https://www.readbyqxmd.com/read/28213986/investigation-of-the-temperature-dependence-of-water-adsorption-on-silica-based-stationary-phases-in-hydrophilic-interaction-liquid-chromatography
#3
Endre Bartó, Attila Felinger, Pavel Jandera
In the present work, the adsorption of water was investigated in aqueous normal-phase liquid chromatography on Cogent Silica C and Cogent Phenyl hydride stationary phases at different temperatures by frontal analysis - using coulometric Karl Fischer titration - to compare the temperature dependence of adsorption of water from aqueous acetonitrile. The Cogent Silica-C and Cogent Phenyl Hydride columns have a silicon hydride surface (silica hydride) with less than 2% free silanol group; therefore, they do not have a strong association with water...
February 9, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28213286/investigation-of-silicon-carbon-nitride-nanocomposite-films-as-a-wear-resistant-layer-in-vitro-and-in-vivo-for-joint-replacement-applications
#4
Y Liang, D G Liu, W Q Bai, J P Tu
Silicon-contained CNx nanocomposite films were prepared using the ion beam assisted magnetron sputtering under different nitrogen gas pressure. With increase of the nitrogen pressure, silicon and nitrogen content of the CNx films drastically increase, and is saturated as the PN2 reach about 40%. Surface roughness and the contact angle are increase, while the friction coefficient decreased. The CNx film with 5.7at.% Si content possess the lowest friction coefficient of only 0.07, and exhibited the best tribological properties...
February 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28212325/a-low-g-silicon-inertial-micro-switch-with-enhanced-contact-effect-using-squeeze-film-damping
#5
Yingchun Peng, Zhiyu Wen, Dongling Li, Zhengguo Shang
Contact time is one of the most important properties for inertial micro-switches. However, it is usually less than 20 μs for the switch with rigid electrode, which is difficult for the external circuit to recognize. This issue is traditionally addressed by designing the switch with a keep-close function or flexible electrode. However, the switch with keep-close function requires an additional operation to re-open itself, causing inconvenience for some applications wherein repeated monitoring is needed. The switch with a flexible electrode is usually fabricated by electroplating technology, and it is difficult to realize low-g switches (<50 g) due to inherent fabrication errors...
February 16, 2017: Sensors
https://www.readbyqxmd.com/read/28212037/coupled-thermodynamic-and-kinetic-changes-in-the-electrochemistry-of-ferrocenyl-monolayers-induced-by-light
#6
Ying Yang, Simone Ciampi, John Justin Gooding
We report on the light-induced systematic changes to the thermodynamics and kinetics of ferrocene units attached to a n-type silicon(100) photoelectrode. Both the reaction rate, as well as the energetics of the charge transfer, are simultaneously affected by changes to the intensity of the incident light. Cyclic voltammetry shows that increases in intensity of illumination can drive the redox process toward less positive potentials, with a downhill shift in E1/2 of ca. 160 mV by increasing light intensity from 3 to 94 mW cm-2...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28212030/revisiting-silicalite-1-nucleation-in-clear-solution-by-electrochemical-impedance-spectroscopy
#7
Gert Brabants, Maxim Hubin, Erwin Konrad Reichel, Bernhard Jakoby, Eric Breynaert, Francis Taulelle, Johan A Martens, Christine E A Kirschhock
EIS was used to detect and investigate nucleation in silicalite-1 clear solutions. Whereas zeolite nucleation was previously assumed to be a step event, inducing a sharp discontinuity around a Si/OH ratio of 1, complex bulk conductivity measurements at elevated temperatures reveal a gradual decay of the conductivity with increased silicon concentrations. Inverse Laplace transformation of the complex conductivity allows to observe the chemical exchange phenomena governing nano-aggregate formation. At low temperatures, the fast exchange between dissociated ions and ion pairs leads to a gradual decay of the conductivity with increasing silicon content...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28211726/realization-of-translational-symmetry-in-trapped-cold-ion-rings
#8
Hao-Kun Li, Erik Urban, Crystal Noel, Alexander Chuang, Yang Xia, Anthony Ransford, Boerge Hemmerling, Yuan Wang, Tongcang Li, Hartmut Häffner, Xiang Zhang
We crystallize up to 15 ^{40}Ca^{+} ions in a ring with a microfabricated silicon surface Paul trap. Delocalization of the Doppler laser-cooled ions shows that the translational symmetry of the ion ring is preserved at millikelvin temperatures. By characterizing the collective motion of the ion crystals, we identify homogeneous electric fields as the dominant symmetry-breaking mechanism at this energy scale. With increasing ion numbers, such detrimental effects are reduced. We predict that, with only a ten-ion ring, uncompensated homogeneous fields will not break the translational symmetry of the rotational ground state...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211702/antimicrobial-effect-of-biocompatible-silicon-nanoparticles-activated-by-therapeutic-ultrasound
#9
Svetlana N Shevchenko, Markus Burkhardt, Eugene V Sheval, Ulyana A Natashina, Christina Große, Alexander L Nikolaev, Alexander V Gopin, Ute Neugebauer, Andrew A Kudryavtsev, Vladimir Sivakov, Liubov Andreevna Osminkina
In this study, we report on a method for suppressing of Escherichia coli (E.coli) vitality by means of therapeutic ultrasound irradiation (USI) using biocompatible silicon nanoparticles as cavitation sensitizers. Silicon nanoparticles without (SiNPs) and with polysaccharide (dextran) coating (DSiNPs) were used. Both types of nanoparticles were non-toxic to Hep 2 cells up to concentration of 2 mg/ml. The treatment of bacteria with nanoparticles and application of 1 W/cm2 USI resulted in reduction of their viability up to 35% and 72% for SiNPs and DSiNPs, respectively...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28211693/a-probabilistic-finite-state-logic-machine-realized-experimentally-on-a-single-dopant-atom
#10
Barbara Fresch, Juanita Bocquel, Sven Rogge, Raphael D Levine, Francoise Remacle
Exploiting the potential of nanoscale devices for logic processing requires the implementation of computing functionalities departing from the conventional switching paradigm. We report on the design and the experimental realisation of a probabilistic finite state machine in a single phosphorus donor atom placed in a silicon matrix electrically addressed and probed by Scanning Tunnelling Spectroscopy (STS). The single atom logic unit simulates the flow of visitors in a maze whose topology is determined by the dynamics of the electronic transport through the states of the dopant...
February 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28211262/superlight-and-superflexible-three-dimensional-semiconductor-frameworks-a-x%C3%A2-y-4-a-si-ge-x-y-c-b-n-with-tunable-optoelectronic-and-mechanical-properties-from-first-principles
#11
Xinrui Cao, Xiao-Fei Li, Zi-Zhong Zhu
Silicon carbide materials as the leading wide-bandgap semiconductor holds significant importance in semiconductor technologies. Here, diamond-like three-dimensional (3D) materials with low density but high elasticity properties have been designed from first-principles calculations. They are porous single-crystalline materials composed of sp3-hybridized Si (or Ge) and sp-type C≡C (or B≡N) linear moieties, while their stabilities are found to be comparable to the recently prepared SiC4 materials. Moreover, we find that such wide-bandgap semiconductors have strong absorption in a wide range of UV region and exhibit superlight, superflexible, and incompressible mechanical properties, and their optoelectronic and mechanical properties can be well tuned via structural modifications...
February 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28211032/depth-of-interaction-determination-in-monolithic-scintillator-with-double-side-sipm-readout
#12
Matteo Morrocchi, Giovanni Ambrosi, Maria Giuseppina Bisogni, Filippo Bosi, Marco Boretto, Piergiorgio Cerello, Maria Ionica, Ben Liu, Francesco Pennazio, Maria Antonietta Piliero, Giovanni Pirrone, Vasile Postolache, Richard Wheadon, Alberto Del Guerra
BACKGROUND: Monolithic scintillators read out by arrays of photodetectors represent a promising solution to obtain high spatial resolution and the depth of interaction (DOI) of the annihilation photon. We have recently investigated a detector geometry composed of a monolithic scintillator readout on two sides by silicon photomultiplier (SiPM) arrays, and we have proposed two parameters for the DOI determination: the difference in the number of triggered SiPMs on the two sides of the detector and the difference in the maximum collected signal on a single SiPM on each side...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28210889/correlation-between-physicochemical-properties-of-modified-clinoptilolite-and-its-performance-in-the-removal-of-ammonia-nitrogen
#13
Yingbo Dong, Hai Lin, Yinhai He
The physicochemical properties of the 24 modified clinoptilolite samples and their ammonia-nitrogen removal rates were measured to investigate the correlation between them. The modified clinoptilolites obtained by acid modification, alkali modification, salt modification, and thermal modification were used to adsorb ammonia-nitrogen. The surface area, average pore width, macropore volume, mecropore volume, micropore volume, cation exchange capacity (CEC), zeta potential, silicon-aluminum ratios, and ammonia-nitrogen removal rate of the 24 modified clinoptilolite samples were measured...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28210755/assessment-of-quinoxyfen-phototransformation-pathways-by-liquid-chromatography-coupled-to-accurate-mass-spectrometry
#14
Priscila Ferri, María Ramil, Isaac Rodríguez, Rosângela Bergamasco, Angélica Marquetotti Salcedo Vieira, Rafael Cela
Quinoxyfen has been recently identified as a priority hazardous substance in the field of the European water policy. In this work, its fate in aqueous samples and solid supports under UV and solar radiation is investigated. Diverse degradation experiments were carried out, at lab scale, using spiked aliquots of different aqueous matrices (ultrapure, treated wastewater and river water) irradiated at different wavelengths (λ = 254 nm, λ = 365 nm and solar light). Half-lives of quinoxyfen (2-26 min) depended on the wavelength and the intensity of radiation whilst the nature of the aqueous matrix did not play an important role in degradation kinetics...
February 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28210441/resin-infiltrant-for-non-cavitated-caries-lesions-evaluation-of-color-stability
#15
Matteo Ceci, Davide Rattalino, Matteo Viola, Riccardo Beltrami, Marco Chiesa, Marco Colombo, Claudio Poggio
BACKGROUND: The objective of this in vitro study was to evaluate the over time color stability of one resin infiltrant (Icon) upon exposure to staining solutions (coffee and wine) compared with one nano-hybrid sealant (Grandio Seal), one transparent fissure sealant with fluoride (Control Seal) and one nanofilled composite (Filtek Supreme XTE). MATERIAL AND METHODS: All materials were polymerized according to manufacturers' instructions into silicon rings (height 1 mm; internal diameter 6 mm; external diameter 8 mm) to obtain specimens identical in size...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28210394/efficacy-and-safety-of-a-novel-100-silicone-scar-gel-treatment-for-early-intervention-in-scar-management
#16
David J Goldberg
Objective: To evaluate the efficacy and safety of a new topical silicone gel for the early intervention in the management of scars. Design: In this 12-week, observational study, healthy subjects (n=15) with an accessible linear or hypertrophic scar were given the test product and instructed to apply twice daily. Subjects returned 14, 28, 56, and 84 days later for evaluation and recording of adverse events. Setting: Private practice of the author. Participants: Eligible subjects had a scar with a Vancouver Scar Scale total score ≥3 at baseline...
December 2016: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/28209175/effectiveness-of-topical-silicone-gel-and-pressure-garment-therapy-for-burn-scar-prevention-and-management-in-children-study-protocol-for-a-randomised-controlled-trial
#17
Jodie Wiseman, Megan Simons, Roy Kimble, Robert Ware, Steven McPhail, Zephanie Tyack
BACKGROUND: Abnormal scar development following burn injury can cause substantial physical and psychological distress to children and their families. Common burn scar prevention and management techniques include silicone therapy, pressure garment therapy, or a combination of both. Currently, no definitive, high-quality evidence is available for the effectiveness of topical silicone gel or pressure garment therapy for the prevention and management of burn scars in the paediatric population...
February 16, 2017: Trials
https://www.readbyqxmd.com/read/28209027/silicon-nanostructures-produced-by-modified-macetch-method-for-antireflective-si-surface
#18
Stepan Nichkalo, Anatoly Druzhinin, Anatoliy Evtukh, Oleg Bratus', Olga Steblova
This work pertains to the method for modification of silicon (Si) wafer morphology by metal-assisted chemical etching (MacEtch) technique suitable for fabrication of antireflective Si surfaces. For this purpose, we made different Au catalyst patterns on the surface of Si substrate. This modification allowed to obtain the close-packed Au nanodrop (ND) pattern that generates the nanowires (NWs) and the well-separated Au NDs, which induce the nanopore (NP) formation. The antireflective properties of these structures in comparison with NWs produced by the conventional Ag-MacEtch method were analysed...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28208996/stress-distribution-under-commercial-denture-liners-a-finite-element-and-clinical-analysis
#19
Rahul Shrivastava, Saurabh Chaturvedi, Ashok Kumar Verma, Mariyum Ali, Amrita Nagendra, Mudita Chaturvedi
INTRODUCTION: Previous studies have shown that 20-30% of denture users have been dissatisfied with their dentures. AIM: To evaluate the stress pattern under elastic and viscoelastic denture liners using 3-Dimensional Finite Element Analysis (FEA) and its clinical correlation using a questionnaire. MATERIALS AND METHODS: The study had both in-vitro and in-vivo phases. In in-vitro phase fabrication of a virtual parametric model of edentulous maxilla and dentures with overlying mucosa was made...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208993/preliminary-sem-observations-on-the-surface-of-elastomeric-impression-materials-after-immersion-or-ozone-disinfection
#20
Nikolas Poulis, Anthony Prombonas, Stavros Yannikakis, Thanasis Karampotsos, Martha-Spyridoula Katsarou, Nikolaos Drakoulis
INTRODUCTION: Surface integrity of dental elastomeric impression materials that are subjected to disinfection is of major importance for the quality of the final prosthetic restorations. AIM: The aim of this qualitative Scanning Electronic Microscopy (SEM) study was to reveal the effects of immersion or ozone disinfection on the surface of four dental elastomeric impression materials. MATERIALS AND METHODS: Four dental elastomeric impression material brands were used (two vinyl polysiloxane silicones, one polyether, and one vinyl polyether silicone)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
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