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https://www.readbyqxmd.com/read/28430499/bc8-silicon-si-iii-is-a-narrow-gap-semiconductor
#1
Haidong Zhang, Hanyu Liu, Kaya Wei, Oleksandr O Kurakevych, Yann Le Godec, Zhenxian Liu, Joshua Martin, Michael Guerrette, George S Nolas, Timothy A Strobel
Large-volume, phase-pure synthesis of BC8 silicon (Ia3[over ¯], cI16) has enabled bulk measurements of optical, electronic, and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap semiconductor with a very small energy gap and moderate carrier concentration and mobility at room temperature, based on far- and midinfrared optical spectroscopy, temperature-dependent electrical conductivity, Seebeck and heat capacity measurements...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430415/omnidirectional-harvesting-of-weak-light-using-a-graphene-quantum-dot-modified-organic-silicon-hybrid-device
#2
Meng-Lin Tsai, Dung-Sheng Tsai, Libin Tang, Lih-Juann Chen, Shu Ping Lau, Jr-Hau He
Despite great improvements in traditional inorganic photodetectors and photovoltaics, more progress is needed in the detection/collection of light at low-level conditions. Traditional photodetectors tend to suffer from high noise when operated at room temperature; therefore these devices require additional cooling systems to detect weak or dim light. Conventional solar cells also face the challenge of poor light-harvesting capabilities in hazy or cloudy weather. The real world features such varying levels of light, which makes it important to develop strategies that allow optical devices to function when conditions are less than optimal...
April 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28412289/structural-studies-of-the-endogenous-spliceosome-the-supraspliceosome
#3
REVIEW
Joseph Sperling, Ruth Sperling
Pre-mRNA splicing is executed in mammalian cell nuclei within a huge (21 MDa) and highly dynamic molecular machine - the supraspliceosome - that individually package pre-mRNA transcripts of different sizes and number of introns into complexes of a unique structure, indicating their universal nature. Detailed structural analysis of this huge and complex structure requires a stepwise approach using hybrid methods. Structural studies of the supraspliceosome by room temperature electron tomography, cryo-electron tomography, and scanning transmission electron microscope mass measurements revealed that it is composed of four native spliceosomes, each resembling an in vitro assembled spliceosome, which are connected by the pre-mRNA...
April 12, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28410289/initial-experience-with-real-time-hybrid-single-photon-emission-computed-tomography-computed-tomography-guided-percutaneous-transthoracic-needle-biopsy
#4
Qian Hua, Xiangyun Zhu, Lei Zhang, Yanjun Zhao, Ping Tang, Jianming Ni
The aim of this study was to explore a technique that uses real-time fusion image of single-photon emission computed tomography/computed tomography (SPECT/CT) to guide percutaneous transthoracic needle biopsy (PTNB) and test its feasibility and safety in patients. Twelve patients with intrathoracic lesions suspicious for malignancy underwent real-time 99m-technetium sestamibi SPECT/CT-guided PTNB. Chest SPECT/CT fusion images were used for biopsy planning and intraprocedure fusion of SPECT with guiding CT was used to adjust the puncture angle and direction...
April 13, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28402625/interplay-of-internal-structure-and-interfaces-on-the-emitting-properties-of-hybrid-zno-hierarchical-particles
#5
Monica Distaso, Giovanni Bertoni, Stefano Todisco, Sergio Marras, Vito Gallo, Liberato Manna, Wolfgang Peukert
The design of hybrid organic/inorganic nanostructures with controlled assembly drives the development of materials with new or improved properties and superior performances. In this paper the surface and internal structure of hybrid ZnO Poly-N-vinyl-pyrrolidone (ZnO/PVP) mesocrystals is investigated in details and correlated with their emitting properties. A photoluminescence study at room temperature reveals that the as-synthesized particles show a remarkable Ultraviolet (UV) emission, whereas the emission from defects in the visible is not observed...
April 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28394574/deterministic-switching-of-perpendicular-magnetic-anisotropy-by-voltage-control-of-spin-reorientation-transition-in-co-pt-3-pb-mg1-3nb2-3-o3-pbtio3-multiferroic-heterostructures
#6
Bin Peng, Ziyao Zhou, Tianxiang Nan, Guohua Dong, Mengmeng Feng, Qu Yang, Xinjun Wang, Shishun Zhao, Dan Xian, Zhuang-De Jiang, Wei Ren, Zuo-Guang Ye, Nian X Sun, Ming Liu
One of the central challenges in realizing multiferroics-based magnetoelectric memories is to switch perpendicular magnetic anisotropy (PMA) with a control voltage. In this study, we demonstrate electrical flipping of magnetization between the out-of-plane and the in-plane directions in (Co/Pt)3/(011) Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures through a voltage-controllable spin reorientation transition (SRT). The SRT onset temperature can be dramatically suppressed at least 200 K by applying an electric field, accompanied by a giant electric-field-induced effective magnetic anisotropy field (ΔHeff) up to 1100 Oe at 100 K...
April 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28393845/optimization-of-self-catalyzed-inas-nanowires-on-flexible-graphite-for-photovoltaic-infrared-photodetectors
#7
Ezekiel A Anyebe, I Sandall, Z M Jin, Ana M Sanchez, Mohana K Rajpalke, Timothy D Veal, Y C Cao, H D Li, R Harvey, Q D Zhuang
The recent discovery of flexible graphene monolayers has triggered extensive research interest for the development of III-V/graphene functional hybrid heterostructures. In order to fully exploit their enormous potential in device applications, it is essential to optimize epitaxial growth for the precise control of nanowire geometry and density. Herein, we present a comprehensive growth study of InAs nanowires on graphitic substrates by molecular beam epitaxy. Vertically well-aligned and thin InAs nanowires with high yield were obtained in a narrow growth temperature window of 420-450 °C within a restricted domain of growth rate and V/III flux ratio...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28393672/radiation-awareness-for-endovascular-abdominal-aortic-aneurysm-repair-in-the-hybrid-operating-room-an-instant-patient-risk-chart-for-daily-practice
#8
Quirina M de Ruiter, Crystel M Gijsberts, Constantijn E Hazenberg, Frans L Moll, Joost A van Herwaarden
PURPOSE: To determine which patient and C-arm characteristics are the strongest predictors of intraoperative patient radiation dose rates (DRs) during endovascular aneurysm repair (EVAR) procedures and create a patient risk chart. METHODS: A retrospective analysis was performed of 74 EVAR procedures, including 16,889 X-ray runs using fixed C-arm imaging equipment. Four multivariate log-linear mixed models (with patient as a random effect) were constructed. Mean air kerma DR (DRAK, mGy/s) and the mean dose area product DR (DRDAP, mGycm(2)/s) were the outcome variables utilized for fluoroscopy as differentiated from digital subtraction angiography (DSA)...
April 1, 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/28391020/ruptured-aneurysm-of-an-aberrant-internal-carotid-artery-successfully-treated-with-simultaneous-intervention-and-surgery-in-a-hybrid-operating-room
#9
Yoichiro Kawamura, Tetsuro Sayama, Naoki Maehara, Ataru Nishimura, Koji Iihara
BACKGROUND: Aberrant internal carotid artery (aICA) is an anatomical anomaly whereby the internal carotid artery (ICA) courses through the tympanic cavity without separation by bone. Since aICA is rare, there are no definite treatment strategies for aICA and its complications. CASE DESCRIPTION: We report a case of aICA accompanied by pseudoaneurysm formation and massive bleeding. Our case was a 31-year-old woman with a 2-year history of hearing loss, ear fullness, and pulsatile tinnitus in her left ear...
April 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28391002/paravalvular-regurgitation-after-transcatheter-aortic-valve-replacement-comparing-transthoracic-versus-transesophageal-echocardiographic-guidance
#10
Salim S Hayek, Frank E Corrigan, Jose F Condado, Shuang Lin, Sharon Howell, James P MacNamara, Shuai Zheng, Patricia Keegan, Vinod Thourani, Vasilis C Babaliaros, Stamatios Lerakis
BACKGROUND: Transcatheter aortic valve replacement (TAVR) is increasingly being performed in cardiac catheterization laboratories using transthoracic echocardiography (TTE) to guide valve deployment. The risk of paravalvular regurgitation (PVR) remains a concern. METHODS: We retrospectively reviewed 454 consecutive patients (mean age, 82 ± 8; 58% male) who underwent transfemoral TAVR at Emory Healthcare from 2007 to 2014. Two hundred thirty-four patients underwent TAVR in the cardiac catheterization laboratory with TTE guidance (TTE-TAVR; mean Society of Thoracic Surgeons score, 10%), while 220 patients underwent the procedure in the hybrid operating room with transesophageal echocardiography (TEE) guidance (TEE-TAVR; mean Society of Thoracic Surgeons score, 11%)...
April 6, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28388067/brightly-luminescent-and-color-tunable-formamidinium-lead-halide-perovskite-fapbx3-x-cl-br-i-colloidal-nanocrystals
#11
Ievgen Levchuk, Andres Osvet, Xiaofeng Tang, Marco Brandl, Jose Dario Perea, Florian Hoegl, Gebhard Josef Matt, Rainer Hock, Miroslaw Batentschuk, Christoph J Brabec
In the past few years, hybrid organic-inorganic and all-inorganic metal halide perovskite nanocrystals have become one of the most interesting materials for optoelectronic applications. Here, we report a facile and rapid room temperature synthesis of 15-25 nm formamidinium CH(NH2)2PbX3 (X=Cl, Br, I, or mixed Cl/Br and Br/I) colloidal nanocrystals by ligand-assisted re-precipitation (LARP). The cubic and platelet-like nanocrystals with their emission in the range of 415-740 nm, full width at half maximum (FWHM) of 20-44 nm and radiative lifetimes of 5-166 ns, enable band gap tuning by halide composition as well as by their thickness tailoring; they have a high photoluminescence quantum yield (up to 85%), colloidal and thermodynamic stability...
April 7, 2017: Nano Letters
https://www.readbyqxmd.com/read/28375611/phase-transition-dielectric-properties-and-ionic-transport-in-the-ch3-2nh2-pbi3-organic-inorganic-hybrid-with-2h-hexagonal-perovskite-structure
#12
A García-Fernández, J M Bermúdez-García, S Castro-García, A L Llamas-Saiz, R Artiaga, J López-Beceiro, S Hu, W Ren, A Stroppa, M Sánchez-Andújar, M A Señarís-Rodríguez
In this work, we focus on [(CH3)2NH2]PbI3, a member of the [AmineH]PbI3 series of hybrid organic-inorganic compounds, reporting a very easy mechanosynthesis route for its preparation at room temperature. We report that this [(CH3)2NH2]PbI3 compound with 2H-perovskite structure experiences a first-order transition at ≈250 K from hexagonal symmetry P63/mmc (HT phase) to monoclinic symmetry P21/c (LT phase), which involves two cooperative processes: an off-center shift of the Pb(2+) cations and an order-disorder process of the N atoms of the DMA cations...
April 4, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28370648/dna-three-way-junction-for-differentiation-of-single-nucleotide-polymorphisms-with-fluorescent-copper-nanoparticles
#13
Feifei Sun, Ying You, Jie Liu, Quanwei Song, Xiaotong Shen, Na Na, Jin Ouyang
We propose a label- and enzyme-free fluorescent sensor for the detection of single nucleotide polymorphisms (SNPs) at room temperature using novel copper nanoparticles (CuNPs) as fluorescent reporters. We construct the CuNPs using a DNA three-way junction (3WJ) template. In this assay, two complementary adenine/thymine-rich probes can hybridize with the wild-type target simultaneously to construct a 3WJ structure, serving as an efficient scaffold for the generation of CuNPs. However, the CuNPs produce weak fluorescence when the probes bind with a mutant-type target...
March 28, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28355736/-hybrid-surgery-for-complex-symptomatic-intracranial-fistulas-a-technical-note
#14
Y Q Zhang, H C Qiu, Y F Tao, M L Liu, X Ye, X L Chen, W J Jiang
Objective: To explore the efficacy of hybrid management of complex symptomatic intracranial fistulas in neurovascular hybrid operating room. Methods: From March 2014 to January 2015, 2 complex dural arteriovenous fistulas and 1 carotid cavernous fistulas were managed by hybrid surgeries in the PLA Rocket Force General Hospital.With first attempts with endovascular treatment failed, all cases were finally managed by hybrid surgery.Dural arteriovenous fistulas were approached via meningeal artery followed craniotomy...
March 21, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28355734/-application-of-hybrid-operating-room-in-the-treatment-of-spinal-dural-arteriovenous-fistulas
#15
W Wang, Y Wang, D Wang, Y Zhao, H Liu, X Y Yang, S G Zhu, F S Xiao, W Wei, T Zhu, X J Yang, J N Zhang
Objective: To explore the experience in the treatment of spinal dural arteriovenous fistulas with application of hybrid operating room. Method: A retrospective analysis was performed among 22 patients with spinal dural arteriovenous fistulas admitted to Department of Neurosurgery of Tianjin Medical University General Hospital who received operation in the hybrid operating room from March 2011 to February 2016. Modified Aminoff-Logue scores (ALS) for myelopathy was used to evaluate the spinal function.All the 22 patients were followed up 6-12 months after the operation...
March 21, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28355733/-management-of-42-complex-intracranial-aneurysms-in-hybrid-operating-room
#16
P Zhao, H X Wu, Rexiti Paerhati, Q L Liu, Y Y Wang, G Li, X G Li, D H Wang
Objective: To analyze the efficacy and methods of hybrid operation in the treatment of complex intracranial aneurysms. Methods: Fourty-two patients with complex intracranial aneurysms were treated in hybrid operation room of Qilu Hospital of Shandong University between July 2011 and October 2016. Twenty-one cases of aneurysm clipping guided by intraoperative angiography, 10 cases of aneurysm clipping assisted by endovascular therapy, and 11 cases of aneurysm occlusion assisted by bypass surgery. Results: Thirty-five patients were followed up 6-36 months...
March 21, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28350468/3d-proton-beam-writing-of-optically-active-coherent-vacancy-spins-in-silicon-carbide
#17
Hannes Kraus, Dmitrij Simin, Christian Kasper, Yoshinori Suda, Shunsuke Kawabata, Wataru Kada, Tomoya Honda, Yasuto Hijikata, Takeshi Ohshima, Vladimir Dyakonov, Georgy V Astakhov
Constructing quantum devices comprises various challenging tasks, especially when concerning their nanoscale geometry. For quantum color centers, the traditional approach is to fabricate the device structure after the non-deterministic placement of the centers. Reversing this approach, we present the controlled generation of quantum centers in silicon carbide (SiC) by focused proton beam in a non-complex manner without need for pre- or post-irradiation treatment. The generation depth and resolution can be predicted by matching the proton energy to the material's stopping power, and the amount of quantum centers at one specific sample volume is tuneable from ensembles of millions to discernible single photon emitters...
March 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/28350003/room-temperature-three-photon-pumped-ch3nh3pbbr3-perovskite-microlasers
#18
Yisheng Gao, Shuai Wang, Can Huang, Ningbo Yi, Kaiyang Wang, Shumin Xiao, Qinghai Song
Hybrid lead halide perovskites have made great strides in next-generation light-harvesting and light emitting devices. Recently, they have also shown great potentials in nonlinear optical materials. Two-photon absorption and two-photon light emission have been thoroughly studied in past two years. However, the three-photon processes are rarely explored, especially for the laser emissions. Here we synthesized high quality CH3NH3PbBr3 perovskite microstructures with solution processed precipitation method and studied their optical properties...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345532/observation-of-variable-hybridized-band-gaps-in-eu-intercalated-graphene
#19
Sijin Sung, Sooran Kim, Paengro Lee, Jingul Kim, Min-Tae Ryu, Heemin Park, Kyoo Kim, Byung Min, Jinwook Chung
We report europium (Eu)-induced changes in the π-band of graphene (G) formed on 6H-SiC(0001) surface by a combined study of photoemission measurements and density functional theory (DFT) calculations. Our photoemission data reveal that Eu intercalates upon annealing at 120 °C into the region between graphene and buffer layer (BL) to form a G/Eu/BL system, where a band gap of 0.29 eV opens at room temperature. This band gap is found to increase further to 0.48 eV upon cooling down to 60 K. Our DFT calculations suggest that the increased band gap originates from the enhanced hybridization between graphene π-Eu 4f band due to the increased magnetic ordering upon cooling...
March 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28345043/anomalous-photovoltaic-effect-in-organic-inorganic-hybrid-perovskite-solar-cells
#20
Yongbo Yuan, Tao Li, Qi Wang, Jie Xing, Alexei Gruverman, Jinsong Huang
Organic-inorganic hybrid perovskites (OIHPs) have been demonstrated to be highly successful photovoltaic materials yielding very-high-efficiency solar cells. We report the room temperature observation of an anomalous photovoltaic (APV) effect in lateral structure OIHP devices manifested by the device's open-circuit voltage (VOC) that is much larger than the bandgap of OIHPs. The persistent VOC is proportional to the electrode spacing, resembling that of ferroelectric photovoltaic devices. However, the APV effect in OIHP devices is not caused by ferroelectricity...
March 2017: Science Advances
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