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Rodrigo Moreno, Alexandre Street, José M Arroyo, Pierluigi Mancarella
Electricity grid operators and planners need to deal with both the rapidly increasing integration of renewables and an unprecedented level of uncertainty that originates from unknown generation outputs, changing commercial and regulatory frameworks aimed to foster low-carbon technologies, the evolving availability of market information on feasibility and costs of various technologies, etc. In this context, there is a significant risk of locking-in to inefficient investment planning solutions determined by current deterministic engineering practices that neither capture uncertainty nor represent the actual operation of the planned infrastructure under high penetration of renewables...
August 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Nicholas Teo, Sadhan C Jana
Water-in-oil emulsion-templating method is used in this work for fabrication of open cell aerogel foams from syndiotactic polystyrene (sPS). A surfactant-stabilized emulsion is prepared at 60 C-100 C by dispersing water in a solution of sPS in toluene. sPS gel, formed upon cooling of the emulsion to room temperature, locks the water droplets inside the gel. The gel is solvent exchanged in ethanol and then dried under supercritical condition of carbon dioxide to yield the aerogel foams. The aerogel foams show significant fraction of macropores of diameter of a few tens of micrometer, defined as macrovoids that originated from the emulsified water droplets...
October 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Zhengqian Luo, Runhua Yang, Tuanjie Du, Qiujun Ruan, Weiwei Li, Nan Chen
In this paper, we report the intermode beating mode-locking of a 2  μm Tm(3+)-doped fiber laser (TDFL) pumped by a 1565 nm continuous-wave multi-longitudinal-mode laser. Because strong intermode beating of the 1565 nm pump source induces the periodic modulation of 2 μm intracavity power, stable mode-locking of the TDFL is successfully established by precisely matching the 2 μm cavity frequency with the intermode-beating frequency of the 1565 nm pump source. The mode-locked laser, without requiring any specific mode-locking element, can stably emit the rectangular nanosecond pulses...
August 1, 2017: Applied Optics
Sajad Jahanbakht
A frequency domain algorithm is proposed for deriving all of the possible steady state modes of dual injection-locked optoelectronic oscillators (DIL-OEOs), corresponding to the detailed system parameters, such as the fiber lengths, small signal open loop gains, radio frequency filters' bandwidths, phase shifting values, and injection parameters. It is shown that some or all of the modes computed by the new approach may be unstable; these are just mathematical solutions of the steady state equations. Therefore, it is necessary to check the stability of these modes...
July 10, 2017: Applied Optics
John D Mooney, John Holmes, Lucy Gavens, Frank de Vocht, Matt Hickman, Karen Lock, Alan Brennan
BACKGROUND: The considerable challenges associated with implementing national level alcohol policies have encouraged a renewed focus on the prospects for local-level policies in the UK and elsewhere. We adopted a case study approach to identify the major characteristics and drivers of differences in the patterns of local alcohol policies and services in two contrasting local authority (LA) areas in England. METHODS: Data were collected via thirteen semi-structured interviews with key informants (including public health, licensing and trading standards) and documentary analysis, including harm reduction strategies and statements of licensing policy...
October 18, 2017: BMC Public Health
Bérangère Godde, Abdelaziz Jouaiti, Audrey Fluck, Nathalie Kyritsakas, Matteo Mauro, Mir Wais Hosseini
The design and synthesis of a novel family of molecular turnstiles T1-T5 were achieved. All five turnstiles are based on a stator and a rotor covalently interconnected. While turnstiles T1-T2 are based on a symmetric stator equipped with two coordinating pyridyl units and a rotor bearing either a pyridyl or p-dimethylaminopyridyl coordinating moiety, the two non-symmetric turnstiles T4 and T5 are based on a stator bearing only a single pyridyl unit and the same rotor as T1 and T2 mentioned above. The switching between the open (T1-T5) and the closed (T-M) states of the turnstiles by metal cations (M = Ag(+) or Pd(2+)) was investigated in solution by using 1D and 2D NMR techniques...
October 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Weida Zhu, Rui Wang, Chunfeng Zhang, Guodong Wang, Yunlong Liu, Wei Zhao, Xingcan Dai, Xiaoyong Wang, Giulio Cerullo, Steven Cundiff, Min Xiao
We introduce a novel configuration for two-dimensional electronic spectroscopy (2DES) that combines the partially collinear pump-probe geometry with active phase locking. We demonstrate the method on a solution sample of CdSe/ZnS nanocrystals by employing two non-collinear optical parametric amplifiers as the pump and probe sources. The two collinear pump pulse replicas are created using a Mach-Zehnder interferometer phase stabilized by active feedback electronics. Taking the advantage of separated paths of the two pump pulses in the interferometer, we improve the signal-to-noise ratio with double modulation of the individual pump beams...
September 4, 2017: Optics Express
Piotr Roztocki, Michael Kues, Christian Reimer, Benjamin Wetzel, Stefania Sciara, Yanbing Zhang, Alfonso Cino, Brent E Little, Sai T Chu, David J Moss, Roberto Morandotti
The on-chip generation of large and complex optical quantum states will enable low-cost and accessible advances for quantum technologies, such as secure communications and quantum computation. Integrated frequency combs are on-chip light sources with a broad spectrum of evenly-spaced frequency modes, commonly generated by four-wave mixing in optically-excited nonlinear micro-cavities, whose recent use for quantum state generation has provided a solution for scalable and multi-mode quantum light sources. Pulsed quantum frequency combs are of particular interest, since they allow the generation of single-frequency-mode photons, required for scaling state complexity towards, e...
August 7, 2017: Optics Express
Tristan E McMillan, Alan J Johnstone
The surgical treatment of proximal humerus fractures remains controversial primarily due to the high complication rate associated with the available fixation methods. In an attempt to reduce the incidence of serious complications and subsequent poor clinical outcomes, proximal humerus locking plates have become popular but even these implants cannot overcome the risk of complications, especially those associated with loss of fracture reduction and screw cut-out/migration through the humeral head. In an attempt to address these issues, we have reviewed the literature, investigating the most likely causes for these predominantly mechanical complications and propose technical solutions...
October 7, 2017: International Orthopaedics
Siamak Dawazdah Emami, Mahdi Mozdoor Dashtabi, Hui Jing Lee, Atoosa Sadat Arabanian, Hairul Azhar Abdul Rashid
This paper presents short wavelength operation of tunable thulium-doped mode-locked lasers with sweep ranges of 1702 to 1764 nm and 1788 to 1831 nm. This operation is realized by a combination of the partial amplified spontaneous emission suppression method, the bidirectional pumping mechanism and the nonlinear polarization rotation (NPR) technique. Lasing at emission bands lower than the 1800 nm wavelength in thulium-doped fiber lasers is achieved using mode confinement loss in a specially designed photonic crystal fiber (PCF)...
October 6, 2017: Scientific Reports
A R O Brito, K Nishinari, P F Saad, K R Saad, M A T Pereira, S C D Emídio, G Yazbek, G A Z Bomfim, R N Cavalcante, M Krutman, M P Teivelis, B S Pignataro, I Y I Fonseca, G Centofanti, B L F Soares
INTRODUCTION: there are only three studies comparing the efficacy of two different types of lock used in totally implantable catheters regarding occlusion or reflux dysfunction. The present study contains the largest published casuistry (862 patients) and is the only that analyzes three parameters: occlusion, reflux dysfunction and flow dysfunction. METHOD: it was a retrospective study of patients operated at a large oncology center and followed up in the outpatient clinic between 2007 and 2015...
September 22, 2017: Annals of Vascular Surgery
Hongguan Wu, Yu Li, Damir Kadirov, Shuangliang Zhao, Xiaohua Lu, Honglai Liu
The solvent-mediated interaction, or equivalently the depletion force, play a pivotal role in the processes, by which two objects in solution such as lock and key particles, antibody and antigen, macromolecule and substrate, are attracted to each other. The quantification of this interaction is important yet challenging since it depends on the microscopic solvent structure in the surrounding. Here, we report an efficient molecular approach for predicting the solvent-mediated interaction by combining the classical density functional theory with a reversible solvation thermodynamic circle...
October 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Veronica Johansson, Surjo R Soekadar, Jens Clausen
Brain-computer interfaces (BCIs) can enable communication for persons in severe paralysis including locked-in syndrome (LIS); that is, being unable to move or speak while aware. In cases of complete loss of muscle control, termed "complete locked-in syndrome," a BCI may be the only viable solution to restore communication. However, a widespread ignorance regarding quality of life in LIS, current BCIs, and their potential as an assistive technology for persons in LIS, needlessly causes a harmful situation for this cohort...
October 2017: Cambridge Quarterly of Healthcare Ethics: CQ: the International Journal of Healthcare Ethics Committees
Tittu Francis, Travis Washington, Karan Srivastava, Vasilios Moutzouros, Eric C Makhni, William Hakeos
BACKGROUND: Tension band wiring (TBW) and locked plating are common treatment options for Mayo IIA olecranon fractures. Clinical trials have shown excellent functional outcomes with both techniques. Although TBW implants are significantly less expensive than a locked olecranon plate, TBW often requires an additional operation for implant removal. To choose the most cost-effective treatment strategy, surgeons must understand how implant costs and return to the operating room influence the most cost-effective strategy...
September 15, 2017: Journal of Shoulder and Elbow Surgery
Benjamin L Micklavzina, Marjorie L Longo
Here we examine how the force on an atomic force microscope (AFM) tip varies as it approaches micellar surfactant films, and use this information to discern the film's surface structure and Young's modulus. Rows of wormlike hemimicelles were created at a graphite interface using 10 mM sodium dodecyl sulfate (SDS). We found that the repulsive force on a silicon nitride tip as it approached the surface was exponential, with a decay length of 2.0 ± 0.1 nm. The addition of Na2SO4 was found to cause a change in this behavior, with a clear split into two exponential regions at concentrations above 1 mM...
September 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Wolfgang Winnicki, Harald Herkner, Matthias Lorenz, Ammon Handisurya, Željko Kikić, Bernhard Bielesz, Benjamin Schairer, Thomas Reiter, Farsad Eskandary, Gere Sunder-Plassmann, Guerkan Sengoelge
Catheter-related infections and dysfunction are the main catheter complications causing morbidity and mortality in hemodialysis patients. However, there are no consistent data for the choice of catheter lock solutions for tunneled hemodialysis lines. In this prospective, multicenter, randomized, controlled trial, two lock regimens using three commercial catheter lock solutions were compared in 106 hemodialysis patients with a newly inserted tunneled central catheter. In the taurolidine group, TauroLock™-Hep500 was used twice per week and TauroLock™-U25,000 once a week...
September 7, 2017: Kidney International
Vivek Trikha, Prabhat Agrawal, Saubhik Das, Sahil Gaba, Arvind Kumar
PURPOSE: The optimal method for fixation of extra-articular distal humerus factures poses a management dilemma. Although various plate configurations have been proposed, anatomic shaped extra-articular distal humerus locking plates have emerged as a viable solution for these complex injuries. We assessed clinico-radiologic outcome in our retrospective case series of extra-articular distal humerus fractures managed with these plates. METHODS: Forty-five patients of extra-articular distal humerus fractures, who were operated at our level 1 trauma centre between January, 2012 and December, 2016, were identified...
September 2017: Journal of Orthopaedic Surgery
Graham E Jackson, Elumalai Pavadai, Gerd Gäde, Zaheer Timol, Niels H Andersen
The primary sequence of the red pigment-concentrating hormone (RPCH) receptor of the water flea, Daphnia pulex, was used in homology modeling to construct the first 3D model of a crustacean G-protein coupled receptor, Dappu-RPCHR. This receptor was found to belong to the class A subfamily of GPCRs with a disulfide bridge between Cys(72) and Cys(150) and an ionic lock between Arg(97) and Thr(224) and Thr(220). NMR restrained molecular dynamics was used to determine the structure of an agonist, Dappu-RPCH, in a membrane-mimicking environment...
August 22, 2017: International Journal of Biological Macromolecules
Yoram Zarai, Michael Margaliot, Tamir Tuller
In many important cellular processes, including mRNA translation, gene transcription, phosphotransfer, and intracellular transport, biological "particles" move along some kind of "tracks". The motion of these particles can be modeled as a one-dimensional movement along an ordered sequence of sites. The biological particles (e.g., ribosomes or RNAPs) have volume and cannot surpass one another. In some cases, there is a preferred direction of movement along the track, but in general the movement may be bidirectional, and furthermore the particles may attach or detach from various regions along the tracks...
2017: PloS One
Michael Grant Rhodes, Marten W de Vries
Increases in incidents involving so-called confused persons have brought attention to the potential costs of recent changes to public mental health (PMH) services in the Netherlands. Decentralized under the (Community) Participation Act (2014), local governments must find resources to compensate for reduced central funding to such services or "innovate." But innovation, even when pressure for change is intense, is difficult. This perspective paper describes experience during and after an investigation into a particularly violent incident and murder...
January 8, 2017: International Journal of Health Policy and Management
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