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https://www.readbyqxmd.com/read/29688244/retinoic-acid-and-ctcf-play-key-roles-in-inducing-the-collinear-expression-of-the-hoxa-cluster
#1
Ji Hoon Oh, Clara Yuri Kim, Ji-Yeon Lee, Myoung Hee Kim
During the development of an embryo, the initiation of the collinear expression of Hox genes is essential for the proper formation of the anteroposterior body axis. Retinoic acid (RA), a natural derivative of vitamin A, plays a role in vertebrate development by regulating Hox gene expression. CCCTC-binding factor (CTCF), an insulator protein that controls gene transcription, also regulates the expression of Hox genes by binding to the CTCF-binding sites (CBSs). It has been reported that upon RA signaling, retinoic acid response elements (RAREs) located in the Hox clusters become occupied...
April 23, 2018: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/29687916/mri-based-wireless-determination-of-the-transfer-function-of-a-linear-implant-introduction-of-the-transfer-matrix
#2
Janot P Tokaya, Alexander J E Raaijmakers, Peter R Luijten, Cornelis A T van den Berg
PURPOSE: We introduce the transfer matrix (TM) that makes MR-based wireless determination of transfer functions (TFs) possible. TFs are implant specific measures for RF-safety assessment of linear implants. The TF relates an incident tangential electric field on an implant to a scattered electric field at its tip that generally governs local heating. The TM extends this concept and relates an incident tangential electric field to a current distribution in the implant therewith characterizing the RF response along the entire implant...
April 24, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29687603/large-photothermal-effect-in-sub-40-nm-h-bn-nanostructures-patterned-via-high-resolution-ion-beam
#3
Josué J López, Antonio Ambrosio, Siyuan Dai, Chuong Huynh, David C Bell, Xiao Lin, Nicholas Rivera, Shengxi Huang, Qiong Ma, Soeren Eyhusen, Ido E Kaminer, Kenji Watanabe, Takashi Taniguchi, Jing Kong, Dimitri N Basov, Pablo Jarillo-Herrero, Marin Soljačić
The controlled nanoscale patterning of 2D materials is a promising approach for engineering the optoelectronic, thermal, and mechanical properties of these materials to achieve novel functionalities and devices. Herein, high-resolution patterning of hexagonal boron nitride (h-BN) is demonstrated via both helium and neon ion beams and an optimal dosage range for both ions that serve as a baseline for insulating 2D materials is identified. Through this nanofabrication approach, a grating with a 35 nm pitch, individual structure sizes down to 20 nm, and additional nanostructures created by patterning crystal step edges are demonstrated...
April 24, 2018: Small
https://www.readbyqxmd.com/read/29687399/the-precision-of-spatial-selection-into-the-focus-of-attention-in-working-memory
#4
Alessandra S Souza, Mirko Thalmann, Klaus Oberauer
Attention helps manage the information held in visual working memory (vWM). Perceptual attention selects the stimuli to be represented in vWM, whereas internal attention prioritizes information already in vWM. In the present study we assessed the spatial precision of perceptual and internal attention in vWM. Participants encoded eight colored dots for a local-recognition test. To manipulate attention, a cue indicated the item most likely to be tested (~65% validity). The cue appeared either before the onset of the memory array (precue) or during the retention interval (retrocue)...
April 23, 2018: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/29686477/a-field-shaking-system-to-reduce-the-screening-current-induced-field-in-the-800-mhz-hts-insert-of-the-mit-1-3-ghz-lts-hts-nmr-magnet-a-small-model-study
#5
Jiho Lee, Dongkeun Park, Philip C Michael, So Noguchi, Juan Bascuñán, Yukikazu Iwasa
In this paper, we present experimental results, of a small-model study, from which we plan to develop and apply a full-scale field-shaking system to reduce the screening current-induced field (SCF) in the 800-MHz HTS Insert (H800) of the MIT 1.3-GHz LTS/HTS NMR magnet (1.3G) currently under construction-the H800 is composed of 3 nested coils, each a stack of no-insulation (NI) REBCO double-pancakes. In 1.3G, H800 is the chief source of a large error field generated by its own SCF. To study the effectiveness of the field-shaking technique, we used two NI REBCO double-pancakes, one from Coil 2 (HCoil2) and one from Coil 3 (HCoil3) of the 3 H800 coils, and placed them in the bore of a 5-T/300-mm room-temperature bore low-temperature superconducting (LTS) background magnet...
April 2018: IEEE Transactions on Applied Superconductivity: a Publication of the IEEE Superconductivity Committee
https://www.readbyqxmd.com/read/29683448/experimental-methods-of-dust-charging-and-mobilization-on-surfaces-with-exposure-to-ultraviolet-radiation-or-plasmas
#6
Xu Wang, Joseph Schwan, Noah Hood, Hsiang-Wen Hsu, Eberhard Grün, Mihály Horányi
Electrostatic dust transport has been hypothesized to explain a number of observations of unusual planetary phenomena. Here, it is demonstrated using three recently developed experiments in which dust particles are exposed to thermal plasma with beam electrons, beam electrons only, or ultraviolet (UV) radiation only. The UV light source has a narrow bandwidth in wavelength centered at 172 nm. The beam electrons with the energy of 120 eV are created with a negatively biased hot filament. When the vacuum chamber is filled with the argon gas, a thermal plasma is created in addition to the electron beam...
April 3, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29683159/morphology-controlled-epitaxial-vanadium-dioxide-low-dimensional-structures-the-delicate-effects-on-the-phase-transition-behaviors
#7
W M Xiong, Jian Shao, Y Q Zhang, Yun Chen, X Y Zhang, W J Chen, Yue Zheng
As an important strongly correlated electron material, VO2 undergoes a metal-insulator transition (MIT) accompanied by a huge change of several orders of magnitude in conductance and transmittance. The MIT behavior can be controlled by low-dimensional structures (LDSs) and the interaction between LDSs and substrates. Consequently, fabricating the LDSs and understanding the phase transition behaviors have great significance for the investigation of fundamental properties and applications. Using the pulsed laser deposition technique, we fabricate abundant LDSs (i...
April 23, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29682865/efficacy-of-forced-air-warming-for-preventing-perioperative-hypothermia-and-related-complications-in-patients-undergoing-laparoscopic-surgery-a-randomized-controlled-trial
#8
Shu-Fen Su, Hsiao-Chi Nieh
BACKGROUND: Perioperatively, unexpected hypothermia may cause adverse surgical outcomes. However, few studies have explored the efficacy of forced-air warming in patients undergoing laparoscopic surgery. AIM/OBJECTIVE: To determine the efficacy of forced-air warming for preventing perioperative hypothermia and complications in patients undergoing laparoscopic surgery. METHODS: A total of 127 participants undergoing laparoscopic thoracic or abdominal surgery were recruited between January and November 2015...
April 23, 2018: International Journal of Nursing Practice
https://www.readbyqxmd.com/read/29682657/boron-nitride-nanosheet-nanofluids-for-enhanced-thermal-conductivity
#9
Xiao Hou, Mengjie Wang, Li Fu, Yapeng Chen, Nan Jiang, Cheng-Te Lin, Zhongwei Wang, Jinhong Yu
It is difficult for traditional cooling liquids to meet equipment requirements due to the high power and high integration they demand. Nanofluids are nanoparticle dispersions with high thermal conductivities, thus they have been proposed for heat transfer applications. Boron nitride nanosheets (BNNSs) possess high thermal conductivities and excellent insulation properties. Here, we fabricated BNNS nanofluids and investigated their effects on thermal conductivity enhancements. We find that BNNSs can effectively enhance the thermal conductivity of water...
April 23, 2018: Nanoscale
https://www.readbyqxmd.com/read/29677848/numerical-study-on-alternating-current-breakdown-mechanism-between-sphere-sphere-electrodes-in-transformer-oil-based-magnetic-nanofluids
#10
Won-Ho Lee, Jong-Chul Lee
A numerical simulation was developed for magnetic nanoparticles in a liquid dielectric to investigate the AC breakdown voltage of the magnetic nanofluids according to the volume concentration of the magnetic nanoparticles. In prior research, we found that the dielectric breakdown voltage of the transformer oil-based magnetic nanofluids was positively or negatively affected according to the amount of magnetic nanoparticles under a testing condition of dielectric fluids, and the trajectory of the magnetic nanoparticles in a fabricated chip was visualized to verify the related phenomena via measurements and computations...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677838/an-analysis-of-hole-trapping-at-grain-boundary-or-poly-si-floating-body-mosfet
#11
Taejin Jang, Myung-Hyun Baek, Hyungjin Kim, Byung-Gook Park
In this paper, we demonstrate the characteristics of the floating body effect of poly-silicon with grain boundary by SENTAURUS™ TCAD simulation. As drain voltage increases, impact ionization occurs at the drain-channel junction. And these holes created by impact ionization are deposited on the bottom of the body to change the threshold voltage. This feature, the kink effect, is also observed in fully depleted silicon on insulator because grain boundary of the poly-silicon serve as a storage to trap the holes...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677832/development-and-performance-analysis-of-carbon-nanowall-based-mass-sensor
#12
Seok Hun Kwon, Hyung Jin Kim, Won Seok Choi, Hyunil Kang
In this study, a mass sensor was fabricated using a carbon nanowalls, and its performance was analyzed. The substrate that was used to fabricate the mass sensor was a polyimide film, on which a SiO2 insulating layer and a copper electrode were deposited using an RF magnetron sputter. Thereafter, a carbon nanowalls was grown on the substrate until its size was 5 by 5 mm. The growth times of the completely grown carbon nanowalls were 20, 25, and 30 minutes, respectively. The performance of the mass sensors fabricated based on different carbon nanowalls grown for various growth times was analyzed according to the changing mass from 1 to 5 mg...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677806/carbon-coated-ordered-mesoporous-sno%C3%A2-composite-based-anode-material-for-high-performance-lithium-ion-batteries
#13
Jungwon Heo, Ying Liu, Anupriya K Haridas, Jinwoo Jeon, Xiaohui Zhao, Kwon-Koo Cho, Hyo-Jun Ahn, Younki Lee, Jou-Hyeon Ahn
Recently, tin oxide (SnO2) has received significant attention for use as an anode material for next generation lithium-ion batteries (LIBs) owing to its high theoretical capacity (782 mAh g-1), which is more than twice of that of the commercialized graphite (372 mAh g-1). Several additional advantages, such as low cost, environmental friendliness, easy fabrication and natural abundance improve its promise. Although the theoretical capacity of SnO2 is high, volume expansion during cycling causes issue with cycling stability...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677804/fabrication-of-aluminum-based-thermal-radiation-plate-for-thermoelectric-module-using-aluminum-anodic-oxidization-and-copper-electroplating
#14
Yi Taek Choi, Sung Hwa Bae, Injoon Son, Ho Sang Sohn, Kyung Tae Kim, Young-Wan Ju
In this study, electrolytic etching, anodic oxidation, and copper electroplating were applied to aluminum to produce a plate on which a copper circuit for a thermoelectric module was formed. An oxide film insulating layer was formed on the aluminum through anodic oxidation, and platinum was coated by sputtering to produce conductivity. Finally, copper electroplating was performed directly on the substrate. In this structure, the copper plating layer on the insulating layer served as a conductive layer in the circuit...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677779/highly-ordered-microscale-pyramidal-structure-arrayed-silicon-membranes-for-filter-applications
#15
Shinae Hwang, Seongjae Lee, Jaehyeon Ko, Moongyu Jang
Microscale-pyramidal-structure-arrayed patterned silicon membranes are manufactured using semiconductor processes and potassium hydroxide (KOH) etching techniques for filter applications. The silicon nitride on silicon on the insulator wafer functions as a masking layer, and the roughness of the silicon (100) plane strongly depends on the etching temperature and KOH concentration. To fabricate the membrane filter, a series of dry and wet etching using 45 wt% KOH solutions at the constant temperature of 70 °C was performed...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677752/synthesis-of-macroporous-silica-particles-by-continuous-generation-of-droplets-for-insulating-materials
#16
Young-Sang Cho, Dokyoung Lee
We report on the synthesis of porous silica particles by self-assembly routes in a continuous manner for application to thermal insulators. A continuous process was employed to produce tiny droplets containing precursor materials such as silica and organic templates for self-organization to fabricate particles with well defined pores. A rotating cylinder system or a spray drying process was adopted to form emulsions or aerosol droplets as micro-reactors for self-assembly, and the physical properties including the thermal conductivity of the resulting porous particles were compared between the two methods...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677743/mechanical-and-thermal-insulation-properties-of-porous-silica-polyurethane-composites
#17
Chunyuan Liu, Younghwan Kwon
Porous hydroxyl-terminated polybutadiene-based polyurethane (HPU) composites containing various hollow glass microspheres (HGMs) up to 75 vol.% were synthesized by one-step bulk polyaddition-type polymerization. An unfilled (non-porous) HPU sample was also prepared as a reference. The thermal conductivity of the HPU/HGM composites, which are considered as a three-phasic material composed of a bulk HPU matrix, silicate thin layer, and pores, could be predicted perfectly by the Felske model. The thermal properties, such as Tg and thermal stability, of the HPU/HGM composites were affected slightly by the addition of HGMs compared to the unfilled HPU...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677736/hole-mobility-characteristics-with-surface-roughness-on-silicon-on-insulator-substrate
#18
Hyeseon Shin, Il-Ki Han, Jae-Hyeon Ko, Moongyu Jang
Hole mobility characteristics were investigated with surface roughness and silicon-on-insulator (SOI) thickness variations to investigate the influence of surface roughness to mobility. The root mean square roughness varied between 0.16, 0.85 and 10.6 nm in 220, 100 and 40 nm thick SOI samples. Hole mobility was measured and analyzed as a function of effective field and temperature with the variations of surface roughness. The hole mobility, determined by transconductance, greatly decreased with the increase of effective field due to the increased surface roughness scattering in 40 nm thick SOI samples...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677734/photoelectric-properties-of-oleds-with-and-without-fluorinated-self-assembled-monolayer-and-by-varying-thickness-of-%C3%AE-npd
#19
Sang-Geon Park, Tatsuo Mori
In this study, we investigated the photoelectric effect and optimization of an organic light-emitting diode (OLED) depending on the presence or absence of a fluorinated self-assembled monolayer (FLSAM) and by varying the thickness of N,N'-Di (1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (α-NPD) from 0 nm to 50 nm. The large distinction in electronegativity between the carbon and the fluorine replacing hydrogen in the alkyl chain of FLSAM generates a strong dipole moment to elevate the vacuum level, resulting in a change of the work function...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677733/electrical-characterization-of-charge-polarity-in-alf%C3%A2-anti-reflection-layers-for-complementary-metal-oxide-semiconductor-image-sensors
#20
Younghwan Hyeon, Pyungho Choi, Sangsub Kim, Minsoo Kim, Jeonghyun Lee, Kiwon Lim, Soonkon Kim, Kwangjun Koo, Byoungdeog Choi
In this study, the charge polarity of aluminum fluoride (AlF3) as a function of varying thickness (tAlF3 = 20, 35, 50, 65, and 80 nm) was discussed. AlF3 films were deposited onto p-Si wafers via electron beam sputtering. Thickness dependent charge polarity and reliability issues under bias-temperature stress conditions were identified using a capacitance-voltage (C-V) characterization method. AlF3 was found to possess negative fixed charges, leading to a C-V curve shift toward the positive gate bias direction as tAlF3 was increased up to 50 nm...
September 1, 2018: Journal of Nanoscience and Nanotechnology
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