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Shilong Zhai, Kun Song, Changlin Ding, Yuanbo Wang, Yibao Dong, Xiaopeng Zhao
We propose a tunable acoustic metasurface using a nested structure as the microunit, which is constituted by two distinct resonators. Thanks to the coupling resonance for the microunit and by simply adjusting the rotation angle of the inner split cavity, this nested structure provides nearly 2π phase shift. The full-wave simulations demonstrate that the constructed metasurface can be tuned to reflect incident sound waves to different directions in the operation frequency region with a very narrow bandwidth, which is a key functionality for many applications such as filtering and imaging...
October 14, 2018: Materials
Xiaohan Wang, Shangchun Piao, Yahui Lei, Nansong Li
Ocean Bottom Seismometers (OBS) placed on the seafloor surface are utilized for measuring the ocean bottom seismic waves. The vibration of OBS excited by underwater noise on its surface may interfere with its measured results of seismic waves. In this particular study, an OBS was placed on the seabed, while ray acoustic theory was used to deduce the sound field distribution around the OBS. Then using this information, the analytical expression for the OBS vibration velocity was obtained in order to find various factors affecting its amplitude...
October 13, 2018: Sensors
Fábio Leitão, Eurico Moreira, Filipe Alves, Mário Lourenço, Olga Azevedo, João Gaspar, Luis A Rocha
Several devices and measurement approaches have recently been developed to perform ballistocardiogram (BCG) and seismocardiogram (SCG) measurements. The development of a wireless acquisition system (hardware and software), incorporating a novel high-resolution micro-electro-mechanical system (MEMS) accelerometer for SCG and BCG signals acquisition and data treatment is presented in this paper. A small accelerometer, with a sensitivity of up to 0.164 µs/µg and a noise density below 6.5 µg/ Hz is presented and used in a wireless acquisition system for BCG and SCG measurement applications...
October 13, 2018: Sensors
Zahra Karbalaei Mirza Shahrbabaki, Farshid Pahlevani, Narjes Gorjizadeh, Rumana Hossain, Mohammad Bagher Ghasemian, Vaibhav Gaikwad, Veena Sahajwalla
The abundant application of metallized paper and the quick growth of their wastes lead to the removal of a huge amount of valuable resources from economic cycle. In this work, for the first-time, the thermal micronizing technique has been used to directly transform the metallized paper wastes to Al-Si nano-rod and Al nano-particles for use as the input in different manufacturing sectors such as additive manufacturing or composite fabrication. Structure of metallized paper has been investigated using FT-IR analysis and first-principle plane-wave calculation...
October 12, 2018: Materials
Weibin Li, Shicheng Hu, Mingxi Deng
It is known that measurement and extraction of the tiny amplitude of second harmonic Lamb waves are the main difficulties for practical applications of the nonlinear Lamb wave technique. In this study, phase-reversal approaches and phase matching technique are combined to build up the second-harmonic generation (SHG) of Lamb waves. A specific Lamb wave mode pair, which satisfied phase matching conditions, is selected to ensure the generation of cumulative second harmonic waves. Lamb wave signals with the same frequency but in reverse phase, propagating in the given specimen, are added together to counteract the fundamental waves, and simultaneously to enhance the signals of the second harmonic generated...
October 12, 2018: Materials
Eugenio Marino-Merlo, Andrea Bulletti, Pietro Giannelli, Marco Calzolai, Lorenzo Capineri
The structural health monitoring (SHM) of critical structures is a complex task that involves the use of different sensors that are also aimed at the identification of the location of the impact point using ultrasonic sensors. For the evaluation of the impact position, reference is often made to the well-known triangulation method. This method requires the estimation of the differential time of arrival (DToA) and the group velocity of the Lamb waves propagating into a plate-like structure: the uncertainty of these two parameters is taken into consideration as main cause of localization error...
October 12, 2018: Sensors
Margarita Minou Báez-Martín, Lilia Maria Morales-Chacón, Iván García-Maeso, Bárbara Estupiñán-Díaz, María Eugenia García-Navarro, Yamila Pérez Téllez, Lourdes Lorigados-Pedre, Nelson Quintanal-Cordero, Ricardo Valdés-Llerena, Judith González González, Randis Garbey-Fernández, Ivette Cabrera-Abreu, Celia Alarcón-Calaña, Juan E Bender Del Busto, Rafael Rodríguez Rojas, Karla Batista García-Ramó, Reinaldo Galvizu Sánchez
Auditory and visual pathways may be affected as a consequence of temporal lobe epilepsy surgery because of their anatomical relationships with this structure. The purpose of this paper is to correlate the results of the auditory and visual evoked responses with the parameters of tractography of the visual pathway, and with the state of connectivity between respective thalamic nuclei and primary cortices in both systems after the surgical resection of the epileptogenic zone in drug-resistant epileptic patients...
October 12, 2018: Behavioral Sciences
Wenda Bi, Yonghui Zhao, Cong An, Shufan Hu
Ground-penetrating radar (GPR) is a kind of high-frequency electromagnetic detection technology. It is mainly used to locate targets and interfaces in underground structures. In addition to the effective signals reflected from the subsurface objects or interfaces, the GPR signals in field work also include noise and different clutters, such as antenna-coupled waves, ground clutters, and radio-frequency interference, which have similar wavelet spectral characteristics with the target signals. Clutter and noise seriously interfere with the target's response signal...
October 12, 2018: Sensors
M Sheikh Mohamed, Srivani Veeranarayanan, Toru Maekawa, D Sakthi Kumar
Cancer is a highly intelligent system of cells, that works together with the body to thrive and subsequently overwhelm the host in order for its survival. Therefore, treatment regimens should be equally competent to outsmart these cells. Unfortunately, it is not the case with current therapeutic practices, the reason why it is still one of the most deadly adversaries and an imposing challenge to healthcare practitioners and researchers alike. With rapid nanotechnological interventions in the medical arena, the amalgamation of diagnostic and therapeutic functionalities into a single platform, theranostics provides a never before experienced hope of enhancing diagnostic accuracy and therapeutic efficiency...
October 12, 2018: Advanced Drug Delivery Reviews
Cédric Lenoir, Aleksandar Jankovski, André Mouraux
Recently studies have aimed at developing transcutaneous spinal direct current stimulation (tsDCS) as a non-invasive technique to modulate spinal function in humans. Independent studies evaluating its after-effects on nociceptive or non-nociceptive somatosensory responses have reported comparable effects suggesting that tsDCS impairs axonal conduction of both the spino-thalamic and the medial lemniscus tracts. The present study aimed to better understand how tsDCS affects, in humans, the spinal transmission of nociceptive and non-nociceptive somatosensory inputs...
October 12, 2018: Neuroscience
Santiago Castro-Zaballa, Matías Cavelli, Joaquín González, Jaime Monti, Atilio Falconi, Pablo Torterolo
Mesopontine and basal forebrain cholinergic neurons are involved in the control of behavioral states and cognitive functions. Animals treated with cholinergic muscarinic receptor antagonists display a dissociated state characterized by behavioral wakefulness (W) associated with high amplitude slow oscillations and spindles in the electroencephalogram (EEG), similar to those that occur during non-REM (NREM) sleep. Oscillations in the gamma frequency band (≈ 40 Hz) of the EEG also play a critical role during W and cognition...
October 12, 2018: Behavioural Brain Research
Gang Yu, Yupeng Guang, Jingdong Li, Jiansheng Xing, Zhiming Bai
AIMS: Testicular ischemia-reperfusion (IR) injury is the primary pathophysiological consequence of testicular torsion. Low-energy shock wave (LESW) is an effective treatment for certain diseases. The present study investigated whether LESW could improve on testicular IR injury in rats and examined the involved mechanism. MAIN METHODS: Testicular reperfusion was induced in rats after 1-h ischemia. The first LESW treatment was performed 30 min prior to testicular reperfusion, and then every other day for another 3 applications...
October 12, 2018: Life Sciences
Elisabeth Kaiser, Qinghai Tian, Michael Wagner, Monika Barth, Wenying Xian, Laura Schroeder, Sandra Ruppenthal, Lars Kaestner, Ulrich Boehm, Philipp Wartenberg, Huiyan Lu, Sara M McMillin, Derek B Bone, Jürgen Wess, Peter Lipp
Aims: Signaling via Gq-coupled receptors is of profound importance in many cardiac diseases such as hypertrophy and arrhythmia. Nevertheless, owing to their widespread expression and the inability to selectively stimulate such receptors in vivo, their relevance for cardiac function is not well understood. We here use DREADD technology to understand the role of Gq-coupled signaling in vivo in cardiac function. Methods and Results: We generated a novel transgenic mouse line that expresses a Gq-coupled DREADD (Dq) in striated muscle under the control of the MCK promotor...
October 13, 2018: Cardiovascular Research
Virginia Sánchez-Jiménez, Noelia Muñoz-Fernández, Javier Ortega-Rivera
This study presents the first evaluation of Dat-e Adolescence, a dating violence prevention program aimed at adolescents in Spain. A cluster randomized control trial was used involving two groups (a control group and experimental group) and two waves (pre-test and post-test six months apart). 1,764 students from across seven state high schools in Andalucía (southern Spain) participated in the study (856 in the control group and 908 in the experimental group); 52.3% were boys (n = 918), with ages ranging from 11 to 19 years (average age = 14...
2018: PloS One
Mujaheed Shaikh, Marisa Miraldo, Anna-Theresa Renner
Waiting time for non-emergency medical care in developing countries is rarely of immediate concern to policy makers that prioritize provision of basic health services. However, waiting time as a measure of health system responsiveness is important because longer waiting times worsen health outcomes and affect utilization of services. Studies that assess socio-economic inequalities in waiting time provide evidence from developed countries such as England and the United States; evidence from developing countries is lacking...
2018: PloS One
Christopher R Beam, Emma M Collins
OBJECTIVES: This article examines whether sexual minority men and women experience greater increases in depressive symptoms and loneliness with age compared to heterosexual men and women. METHODS: Using three waves of data from sexual minority (nMen  = 87 and nWomen  = 62) and heterosexual (nMen  = 1,297 and nWomen  = 1,362) older adults in the National Social Life, Health, and Aging Project, we used latent growth curve modeling to test whether change in depressive symptoms and loneliness varies across sexual orientation and whether annual household income and family support accounted for this change...
October 15, 2018: Clinical Gerontologist
Jaclyn M Ross, Benjamin R Karney, Teresa P Nguyen, Thomas N Bradbury
Demands for change in a relationship, particularly when met by behavioral withdrawal, foreshadow declines in relationship satisfaction. Yet demands can give partners opportunities to voice concerns, and withdrawal can serve to de-escalate conflict, stabilizing satisfaction instead (e.g., Overall, Fletcher, Simpson, & Sibley, 2009). We aim to reconcile these competing possibilities by arguing that withdrawal in response to requests for change will be detrimental among couples who possess the social, educational, and economic capital needed to address these requests, whereas withdrawal in response to partner demands will be constructive among couples with fewer resources for making the requested changes...
October 15, 2018: Journal of Personality and Social Psychology
Xu Liu, Xiuyun Lin, Melissa Allen Heath, Qing Zhou, Wan Ding, Shaozheng Qin
Parents of children with oppositional defiant disorder (ODD) experience considerable stress and challenges in parenting. Based on a 2-year, 3-wave longitudinal study of children with ODD (N = 243, mean age = 9.47 years, SD = 1.53; 72.8% boys) and their parents in Mainland China, our study examined the relation between 3 dimensions of parenting stress (i.e., Parental Distress, Parent-Child Dysfunctional Interaction, and Difficult Child) and their children's ODD symptoms. Using cross-lagged panel models, we tested the bidirectional relation between parenting stress and children's ODD symptoms...
October 15, 2018: Journal of Family Psychology: JFP
Tamilyn Bakas, Debi Sampsel, Jahmeel Israel, Ameya Chamnikar, Angela Ellard, John Greer Clark, Megan Gresham Ulrich, Dieter Vanderelst
BACKGROUND AND PURPOSE: With the growth in the aging population, and shortage of primary care providers, telehealth programs are needed to optimize healthy independent living for older adults. The purpose of this study was to evaluate a nurse-led intervention program delivered through a telepresence robot to promote healthy lifestyles and address chronic illness management among older adults living independently in a retirement community. Telepresence robots provide two-way video-mediated communication with remote in-home navigation...
October 15, 2018: Journal of Nursing Scholarship
Sushant Kumar Behera, Pritam Deb
The first-order standard perturbation theory combined with ab initio projector augmented wave operator challenges the realization of the standard Sternheimer equation with linear computational efficiency. This efficiency motivates us to describe the electron-phonon interaction in a two-dimensional (2D) black phosphorous monolayer using generalized density functional perturbation theory (DFPT) with Boltzmann transport theory (BTE). Subsequently, linear response phonon dynamic behaviours in terms of conductivities, Seebeck coefficients and transport properties are studied for the thermoelectric application...
October 15, 2018: Physical Chemistry Chemical Physics: PCCP
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