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Novel device

Enrico Ravagli, Stefano Severi
During hemodialysis (HD), blood is circulated through an extracorporeal tubing system (bloodline) made of medical-grade polymeric material. Sensors of various types that do not come into contact with blood (optical, electromagnetic, etc.) are applied directly across the bloodline for clinical purposes and for therapy customization. Thus, a detailed knowledge of the bloodline's physical properties is useful for the development of next-generation HD sensors. In this work, we performed a novel comparative analysis of the materials used by the manufacturers of the bloodlines...
March 16, 2018: Materials
Jiaye Su, Yunzhen Zhao, Chang Fang
Graphene is a versatile 2D material and attracts increasing attentions from a broad scientific community, including novel nanofluidic devices. In this work, we use molecular dynamics simulations to study the pressure driven water transport through graphene layers, focusing on the pore size homogeneity, realized by the arrangement of two pore sizes. For a given layer number, we find the water flux exhibits an excellent linear behavior with the pressure, in agreement with the prediction of Hagen-Poiseuille equation...
March 16, 2018: Nanotechnology
Changlong Liu, Lin Wang, Xiaoshuang Chen, Jing Zhou, Weiwei Tang, Wanlong Guo, Jin Wang, Wei Lu
The present work reports on a graphene-like material that is promising for photodetection applications due to its high optical absorption and layer-dependent properties. To date, only narrowband photodetectors have been realized; therefore, extending the working wavelength is becoming more imperative for applications such as high-contrast imaging and remote sensing. In this work, we developed a novel detection technique that provides enhanced performance across the infrared and terahertz bands by using an antenna-assisted top-gated black phosphorus phototransistor...
March 16, 2018: Nanoscale
Junichi Tokuda, Laurent Chauvin, Brian Ninni, Takahisa Kato, Franklin King, Kemal Tuncali, Nobuhiko Hata
Patient-mounted needle guide devices for
 percutaneous ablations are vulnerable to patient motion. The objective of this study is to develop and evaluate a software system for MRI-compatible patient-mounted needle guide device that can adaptively compensate for the displacement of the device due to the patient motion using a novel image-based automatic device-to-image registration.
 Materials and Methods. We developed a software system for an MRI-compatible patient-mounted needle guide device for percutaneous ablations...
March 16, 2018: Physics in Medicine and Biology
Stanimir Georgiev, Daniel Tanase, Peter Ewert, Christian Meierhofer, Alfred Hager, Jelena Pabst von Ohain, Andreas Eicken
BACKGROUND: To investigate the feasibility and mid-term results of percutaneous pulmonary valve implantation (PPVI) in patients with conduit free or "native" right ventricular outflow tracts (RVOT). METHODS AND RESULTS: We identified all 18 patients with conduit free or "native" right ventricular outflow tract, who were treated with percutaneous pulmonary valve implantation (PPVI) in our institution. They were divided into two groups - these in whom the central pulmonary artery was used as an anchoring point for the preparation of the landing zone (n=10) for PPVI and these, in whom a pulmonary artery branch was used for this purpose (n=8)...
May 1, 2018: International Journal of Cardiology
Chundong Wang, Likun Zhu, Liangyi Gong, Zhentang Zhao, Lei Yang, Zheli Liu, Xiaochun Cheng
With the development of the Internet-of-Things (IoT), wireless network security has more and more attention paid to it. The Sybil attack is one of the famous wireless attacks that can forge wireless devices to steal information from clients. These forged devices may constantly attack target access points to crush the wireless network. In this paper, we propose a novel Sybil attack detection based on Channel State Information (CSI). This detection algorithm can tell whether the static devices are Sybil attackers by combining a self-adaptive multiple signal classification algorithm with the Received Signal Strength Indicator (RSSI)...
March 15, 2018: Sensors
Han Sun, Xiong Zhang, Yacong Zhao, Yu Zhang, Xuefei Zhong, Zhaowen Fan
The novel human-computer interface (HCI) using bioelectrical signals as input is a valuable tool to improve the lives of people with disabilities. In this paper, surface electromyography (sEMG) signals induced by four classes of wrist movements were acquired from four sites on the lower arm with our designed system. Forty-two features were extracted from the time, frequency and time-frequency domains. Optimal channels were determined from single-channel classification performance rank. The optimal-feature selection was according to a modified entropy criteria (EC) and Fisher discrimination (FD) criteria...
March 15, 2018: Sensors
Cristina Rodríguez-Seco, Lydia Cabau, Anton Vidal-Ferran, Emilio Palomares
Over hundreds of new organic semiconductor molecules have been synthesized as hole transport materials (HTMs) for perovskite solar cells. However, to date, the well-known N2 , N2 , N2' , N2' , N7 , N7 , N7' , octakis-(4-methoxyphenyl)-9,9-spirobi-[9,9'-spirobi[9 H-fluorene]-2,2',7,7'-tetramine (spiro-OMeTAD) is still the best choice for the best perovskite device performance. Nevertheless, there is a consensus that spiro-OMeTAD by itself is not stable enough for long-term stable devices, and its market price makes its use in large-scale production costly...
March 15, 2018: Accounts of Chemical Research
Zengkai Shao, Jiangbo Zhu, Yanfeng Zhang, Yujie Chen, Siyuan Yu
Cylindrical vector vortex (CVV) beams, complex light fields that exhibit a vector nature and carry quantized orbital angular momentum (OAM) states, have been widely investigated due to their rich applications. Current technologies to generate CVV beams using individual polarization and spatial phase manipulations suffer from bulky size and low configurability. In this Letter, we propose and experimentally demonstrate an approach to generate CVV beams with a single integrated device based on a silicon nitride microring resonator and embedded top-gratings...
March 15, 2018: Optics Letters
Ginga Kato, Yoshihiro Kuroda, Kiyoshi Kiyokawa, Haruo Takemura
Most existing locomotion devices that represent the sensation of walking target a user who is actually performing a walking motion. Here, we attempted to represent the walking sensation, especially a kinesthetic sensation and advancing feeling (the sense of moving forward) while the user remains seated. To represent the walking sensation using a relatively simple device, we focused on the force rendering and its evaluation of the longitudinal friction force applied on the sole during walking. Based on the measurement of the friction force applied on the sole during actual walking, we developed a novel friction force display that can present the friction force without the influence of body weight...
April 2018: IEEE Transactions on Visualization and Computer Graphics
Theodoros T Koutserimpas, Romain Fleury
We explore the unconventional wave scattering properties of non-Hermitian systems in which amplification or damping are induced by time-periodic modulation. These non-Hermitian time-Floquet systems are capable of nonreciprocal operations in the frequency domain, which can be exploited to induce novel physical phenomena such as unidirectional wave amplification and perfect nonreciprocal response with zero or even negative insertion losses. This unique behavior is obtained by imparting a specific low-frequency time-periodic modulation to the complex coupling between lossless resonators, promoting only upward frequency conversion, and leading to nonreciprocal parametric gain...
February 23, 2018: Physical Review Letters
Michael C Lucking, Weiyu Xie, Duk-Hyun Choe, Damien West, Toh-Ming Lu, S B Zhang
Interest in two-dimensional materials has exploded in recent years. Not only are they studied due to their novel electronic properties, such as the emergent Dirac fermion in graphene, but also as a new paradigm in which stacking layers of distinct two-dimensional materials may enable different functionality or devices. Here, through first-principles theory, we reveal a large new class of two-dimensional materials which are derived from traditional III-V, II-VI, and I-VII semiconductors. It is found that in the ultrathin limit the great majority of traditional binary semiconductors studied (a series of 28 semiconductors) are not only kinetically stable in a two-dimensional double layer honeycomb structure, but more energetically stable than the truncated wurtzite or zinc-blende structures associated with three dimensional bulk...
February 23, 2018: Physical Review Letters
Pratibha Ramarao, Neha Bhagwani Topnani, Prutha N
Periodic orientation patterns occurring in nematic gels revealed by optical and scanning electron microscopy are found to be formed by spontaneous self assembly of fibrous aggregates of a low-molecular weight organogelator in an aligned thermotropic liquid crystal (LC). The self organization into the periodic structure is also reflected in a calorimetric study which shows the occurrence of three thermoreversible states viz. isotropic liquid, nematic and nematic gel. The segregation and self assembly of the fibrous aggregates leading to the pattern formation is attributed to the highly polar LC and the hydrogen bonding between gelator molecules as shown by x-ray diffraction and vibrational spectroscopy...
March 15, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Lu Dai, Ka-Di Zhu, Wenzhong Shen, Xiaojiang Huang, Li Zhang, Alain Goriely
Chiral structures play an important role in natural sciences due to their great variety and potential applications. A perversion connecting two helices with opposite chirality creates a dual-chirality helical structure. In this paper, we develop a novel model to explore quantitatively the mechanical behavior of normal, binormal and transversely isotropic helical structures with dual chirality and apply these ideas to known nanostructures. It is found that both direction and amplitude of rotation can be finely controlled by designing the cross-sectional shape...
March 15, 2018: Nanoscale
Aslam Alkadhimi, Ebrahim A Al-Awadhi
INTRODUCTION: In recent years, extensive research has introduced novel ways of reinforcing orthodontic anchorage using a variety of devices temporarily anchored in bone (miniscrews). Currently, there are numerous manufacturers with different miniscrew designs on the market. AIMS: The aim of this paper is to discuss the key design features of different miniscrew systems on the market. Furthermore, to present clinical selection criteria of miniscrews in different settings taking into account the determinant factors...
March 15, 2018: Journal of Orthodontics
Mohammed Rashid Akhtar, Jimmy Kyaw Tun, Riad Alchanan, Ounali Jaffer, Snehal Patel, Joo-Young Chun, Nicholas Bunker, Tim Fotheringham
There has been increasing use of a novel combined femoral venous sheath, catheter and retrievable self-expanding and collapsible diamond-shaped IVC filter (Angel® Catheter, BiO2 Medical), in severely injured patients who cannot receive anticoagulation. As the filter is not detached from the catheter/sheath, it should be easily retrieved. Outcomes included in large registries demonstrate a high safety profile and a 100% retrieval rate. However, at our institution-a Level 1 major UK trauma centre with 4 years of substantial experience in using this device-we've encountered three cases of device fracture and subsequent complicated retrieval dating from Dec 2016 to March 2017...
March 14, 2018: Cardiovascular and Interventional Radiology
Shoushuang Huang, Haitao Wang, Shangdai Wang, Zhangjun Hu, Ling Zhou, Zhiwen Chen, Yong Jiang, Xuefeng Qian
Designing low-cost electrocatalysts combining the features of outstanding catalytic activity, excellent electrical conductivity, and high chemical stability remains a critical challenge for the large-scale fabrication of dye-sensitized solar cells (DSSCs). Here we report the controlled synthesis of CoS2 -CoSe2 heterostructured nanocrystals encapsulated in N-doped carbon hollow nanocubes (CoS2 -CoSe2 @NC) through simultaneous sulfurization and selenization of polydopamine coated Prussian blue analogs. Benefiting from both structural and compositional characteristics, namely, the synergistic effect of CoS2 -CoSe2 heterojunctions, the conductive N-doped carbon coating and the porous structure of the nanocubes, the resultant CoS2 -CoSe2 @NC nanocubes exhibit excellent electrocatalytic activity and cycling stability toward the generation of I3 - ions in DSSCs...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Shan Wei, Zachary R Weiss, Zev Williams
Real-time sequencing of short DNA reads has a wide variety of clinical and research applications including screening for mutations, target sequences and aneuploidy. We recently demonstrated that MinION, a nanopore-based DNA sequencing device the size of a USB drive, could be used for short-read DNA sequencing. In this study, an ultra-rapid multiplex library preparation and sequencing method for the MinION is presented and applied to accurately test normal diploid and aneuploidy samples' genomic DNA in under three hours, including library preparation and sequencing...
March 14, 2018: G3: Genes—Genomes—Genetics
Pascal Desgranges, Hicham Kobeiter, Frederic Cochennec, Vania Tacher, Joseph Touma, Marek Majewski, Jean Marzelle, Éric Allaire, Jean-Pierre Becquemin
Abdominal aortic aneurysms (AAA), also called "silent killer" as they grow without symptoms until the final rupture, are the 3rd cause of cardiovascular deaths, after myocardial infarction and stroke. Surgery is the only efficient way of preventing aortic rupture. The initial technique, described by Charles Dubost in 1952 has evolved and results and provides fair long-term results: open repair (OR) is performed under general anesthesia, via a transperitoneal or a retroperitoneal approach. Laparoscopic repair aims to reduce the consequences of surgery, but its role is still debated due to limited experience and to variable results...
March 11, 2018: La Presse Médicale
Genia Dubrovsky, James C Y Dunn
PURPOSE OF REVIEW: The purpose of this review is to briefly summarize the notable structures and pathways in intestinal epithelial growth before presenting the current main areas of active research in intestinal regeneration. As a rapidly advancing field, a number of breakthroughs have recently been made related to the culture of intestinal stem cells (ISCs) and to the engineering of intestinal tissue. RECENT FINDINGS: ISCs can be derived from fibroblasts and can be cultured in hydrogels under xenogeneic-free conditions...
March 13, 2018: Current Opinion in Pediatrics
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