Read by QxMD icon Read

Fit bit

Thomas J Giardina, Andrew G Clark, Anthony C Fiumera
Female Drosophila melanogaster frequently mate with multiple males in nature as shown through parentage analysis. Although polyandry is well documented, we know little about the timing between mating events in wild Drosophila populations due to the challenge of following behaviors of individual females. In this study we used the presence of a male reproductive protein that is transferred to the female during mating (Sex Peptide, SP) to determine whether she had recently mated. We sampled females throughout the day, conducted control matings to determine the decay rate of SP within the female reproductive tract and performed computer simulations to fit the observed proportion of mated females to a non-homogenous Poisson process that defined the expected time between successive matings for a given female...
February 18, 2017: Molecular Ecology Resources
Diana Car, Sonia Conesa-Boj, Hao Zhang, Roy L M Op Het Veld, Michiel W A de Moor, Elham M T Fadaly, Önder Gül, Sebastian Kölling, Sebastien R Plissard, Vigdis Toresen, Michael T Wimmer, Kenji Watanabe, Takashi Taniguchi, Leo P Kouwenhoven, Erik P A M Bakkers
Majorana zero modes (MZMs), prime candidates for topological quantum bits, are detected as zero bias conductance peaks (ZBPs) in tunneling spectroscopy measurements. Implementation of a narrow and high tunnel barrier in the next generation of Majorana devices can help to achieve the theoretically predicted quantized height of the ZBP. We propose a material-oriented approach to engineer a sharp and narrow tunnel barrier by synthesizing a thin axial segment of GaxIn1-xSb within an InSb nanowire. By varying the precursor molar fraction and the growth time, we accurately control the composition and the length of the barriers...
February 8, 2017: Nano Letters
Shengxiong Liu, Xiuju Yang, Jianguo Cui, Zhiyong Yin
In traffic forensic identifications, it was usually unfavorable that estimated velocities of questioned vehicles derived from frame-based methods eventually turned out to be close to but a bit less than speed limits. In this paper, a novel pixel-based method was presented to estimate vehicles' relatively instantaneous velocities. First, two adjacent pixels' actual distance was acquired from the closed-circuit television (CCTV) images. Then, the instantaneous average velocity within this one frame interval time (FIT) was calculated out...
January 9, 2017: Journal of Forensic Sciences
X Fave, L Zhang, J Yang, D Mackin, F Stingo, D Followill, P Balter, A Jones, D Gomez, L Court
PURPOSE: To determine how radiomics features change during radiation therapy and whether those changes (delta-radiomics features) can improve prognostic models built with clinical factors. METHODS: 62 radiomics features, including histogram, co-occurrence, run-length, gray-tone difference, and shape features, were calculated from pretreatment and weekly intra-treatment CTs for 107 stage III NSCLC patients (5-9 images per patient). Image preprocessing for each feature was determined using the set of pretreatment images: bit-depth resample and/or a smoothing filter were tested for their impact on volume-correlation and significance of each feature in univariate cox regression models to maximize their information content...
June 2016: Medical Physics
Chao Qian, Yang Yu, Ke Tang, Yaochu Jin, Xin Yao, Zhi-Hua Zhou
In real-world optimization tasks, the objective (i.e., fitness) function evaluation is often disturbed by noise due to a wide range of uncertainties. Evolutionary algorithms are often employed in noisy optimization, where reducing the negative effect of noise is a crucial issue. Sampling is a popular strategy for dealing with noise: to estimate the fitness of a solution, it evaluates the fitness multiple (k) times independently and then uses the sample average to approximate the true fitness. Obviously, sampling can make the fitness estimation closer to the true value, but also increases the estimation cost...
December 16, 2016: Evolutionary Computation
Jie Yang, Jinlu Liu, Qi Su, Zhengyu Li, Fan Fan, Bingjie Xu, Hong Guo
We present a random number generation scheme based on measuring the phase fluctuations of a laser with a simple experimental setup. A simple model is established to analyze the randomness and the simulation result based on this model fits well with the experiment data. After the analog to digital sampling and suitable randomness extraction integrated in the field programmable gate array, the final random bits are delivered to a PC, realizing a 5.4 Gbps real time quantum random number generation. The final random bit sequences have passed all the NIST and DIEHARD tests...
November 28, 2016: Optics Express
Mohammad Upal Mahfuz, Dimitrios Makrakis, Hussein T Mouftah
Unlike normal diffusion, in anomalous diffusion, the movement of a molecule is described by the correlated random walk model where the mean square displacement of a molecule depends on the power law of time. In molecular communication (MC), there are many scenarios when the propagation of molecules cannot be described by normal diffusion process, where anomalous diffusion is a better fit. In this paper, the effects of anomalous subdiffusion on concentration-encoded molecular communication (CEMC) are investigated...
September 2016: IEEE Transactions on Nanobioscience
(no author information available yet)
: Editor's note: From its first issue in 1900 through to the present day, AJN has unparalleled archives detailing nurses' work and lives over more than a century. These articles not only chronicle nursing's growth as a profession within the context of the events of the day, but they also reveal prevailing societal attitudes about women, health care, and human rights. Today's nursing school curricula rarely include nursing's history, but it's a history worth knowing. To this end, From the AJN Archives highlights articles selected to fit today's topics and times...
November 2016: American Journal of Nursing
Tingting Wu, Alexander J Dufford, Melissa-Ann Mackie, Laura J Egan, Jin Fan
Cognitive control refers to the processes that permit selection and prioritization of information processing in different cognitive domains to reach the capacity-limited conscious mind. Although previous studies have suggested that the capacity of cognitive control itself is limited, a direct quantification of this capacity has not been attempted. In this behavioral study, we manipulated the information rate of cognitive control by parametrically varying both the uncertainty of stimul measured as information entropy and the exposure time of the stimuli...
September 23, 2016: Scientific Reports
Mohammad Mahfuz, Dimitrios Makrakis, Hussein T Mouftah
Unlike normal diffusion, in anomalous diffusion, the movement of a molecule is described by the correlated random walk model where the mean square displacement of a molecule depends on the power law of time. In molecular communication (MC), there are many scenarios when the propagation of molecules cannot be described by normal diffusion process, where anomalous diffusion is a better fit. In this paper, the effects of anomalous subdiffusion on concentration-encoded molecular communication (CEMC) are investigated...
July 7, 2016: IEEE Transactions on Nanobioscience
Nicola Prezza, Francesco Vezzi, Max Käller, Alberto Policriti
BACKGROUND: Bisulfite treatment of DNA followed by sequencing (BS-seq) has become a standard technique in epigenetic studies, providing researchers with tools for generating single-base resolution maps of whole methylomes. Aligning bisulfite-treated reads, however, is a computationally difficult task: bisulfite treatment decreases the (lexical) complexity of low-methylated genomic regions, and C-to-T mismatches may reflect cytosine unmethylation rather than SNPs or sequencing errors. Further challenges arise both during and after the alignment phase: data structures used by the aligner should be fast and should fit into main memory, and the methylation-caller output should be somehow compressed, due to its significant size...
March 2, 2016: BMC Bioinformatics
Revital Huber-Shalem, Ofer Hadar, Stanley R Rotman, Merav Huber-Lerner
Infrared (IR) imagery sequences are commonly used for detecting moving targets in the presence of evolving cloud clutter or background noise. This research focuses on slow-moving point targets that are less than one pixel in size, such as aircraft at long range from a sensor. Since transmitting IR imagery sequences to a base unit or storing them consumes considerable time and resources, a compression method that maintains the point target detection capabilities is highly desirable. In this work, we introduce a new parametric temporal compression that incorporates Gaussian fit and polynomial fit...
February 10, 2016: Applied Optics
M P Arnold, L D Burger, D Wirz, B Goepfert, M T Hirschmann
PURPOSE: The purpose was to investigate graft slippage and ultimate load to failure of a femoral press-fit fixation technique for anterior cruciate ligament (ACL) reconstruction. METHODS: Nine fresh-frozen knees were used. Standardized harvesting of the B-PT-B graft was performed. The femora were cemented into steel rods, and a tunnel was drilled outside-in into the native ACL footprint and expanded using a manual mill bit. The femoral bone block was fixed press-fit...
January 7, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Li Min Li, Sharon Johnson
UNLABELLED: The 'Time is Brain" concept has been a major focus in the World Stroke Awareness Campaign. OBJECTIVE: We describe our experience with a Hackathon (junction of hack+marathon), a 24 hour event of innovation- and technology-based project development, focused around detecting stroke. METHOD: The Hackathon was held during a Brazilian Student's union (BRASA) congress involving students from engineering and other technological disciplines...
December 2015: Arquivos de Neuro-psiquiatria
Jinwu Wei, Hongmei Feng, Zengtai Zhu, Qingfang Liu, Jianbo Wang
A short-circuited coplanar waveguide jig was proposed due to its simple structure and potential applications, which was successfully used to measure the permeability spectra of magnetic thin film. The result obtained from the coplanar waveguide (CPW) jig exhibits typical ferromagnetic resonance spectra, which can be well fitted by a trade-off equation because the measured permeability spectra have a bit of asymmetry because of the special intensity distribution of the microwave magnetic field in the CPW. In order to confirm the availability of the shorted CPW jig, a previous short-circuited microstrip line jig was used to measure the permeability spectra of the same sample...
November 2015: Review of Scientific Instruments
Rongfeng Cui, Molly Schumer, Gil G Rosenthal
UNLABELLED: We introduce a new forward-time simulator, Admix'em, that allows for rapid and realistic simulations of admixed populations with selection. Complex selection can be achieved through user-defined fitness and mating-preference probability functions. Users can specify realistic genomic landscapes and model neutral SNPs in addition to sites under selection. Admix'em is designed to simulate selection in admixed populations but can also be used as a general population simulator...
April 1, 2016: Bioinformatics
Cesar Carranza, Daniel Llamocca, Marios Pattichis
The discrete periodic radon transform (DPRT) has extensively been used in applications that involve image reconstructions from projections. Beyond classic applications, the DPRT can also be used to compute fast convolutions that avoids the use of floating-point arithmetic associated with the use of the fast Fourier transform. Unfortunately, the use of the DPRT has been limited by the need to compute a large number of additions and the need for a large number of memory accesses. This paper introduces a fast and scalable approach for computing the forward and inverse DPRT that is based on the use of: a parallel array of fixed-point adder trees; circular shift registers to remove the need for accessing external memory components when selecting the input data for the adder trees; an image block-based approach to DPRT computation that can fit the proposed architecture to available resources; and fast transpositions that are computed in one or a few clock cycles that do not depend on the size of the input image...
January 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
A Eugene DePrince, C David Sherrill
We present an algorithm for coupled-cluster through perturbative triples [CCSD(T)] based on a t1-dressed Hamiltonian and the use of density fitting (DF) or Cholesky decomposition (CD) approximations for the construction and contraction of all electron repulsion integrals (ERIs). An efficient implementation of this algorithm is then used to explore whether preoptimized density fitting basis sets [specifically, the (aug-)cc-pVXZ-RI series designed for DF-MP2 computations] are suitable for DF-CCSD(T) computations and how they compare to the CD representation of the integrals...
June 11, 2013: Journal of Chemical Theory and Computation
Chao Qian, Yang Yu, Zhi-Hua Zhou
Many optimization tasks must be handled in noisy environments, where the exact evaluation of a solution cannot be obtained, only a noisy one. For optimization of noisy tasks, evolutionary algorithms (EAs), a type of stochastic metaheuristic search algorithm, have been widely and successfully applied. Previous work mainly focuses on the empirical study and design of EAs for optimization under noisy conditions, while the theoretical understandings are largely insufficient. In this study, we firstly investigate how noisy fitness can affect the running time of EAs...
October 20, 2015: Evolutionary Computation
Chi-Wai Chow, Chung-Yen Chen, Shih-Hao Chen
Complementary Metal-Oxide-Semiconductor (CMOS) image sensors are widely used in mobile-phone and cameras. Hence, it is attractive if these image sensors can be used as the visible light communication (VLC) receivers (Rxs). However, using these CMOS image sensors are challenging. In this work, we propose and demonstrate a VLC link using mobile-phone camera with data rate higher than frame rate of the CMOS image sensor. We first discuss and analyze the features of using CMOS image sensor as VLC Rx, including the rolling shutter effect, overlapping of exposure time of each row of pixels, frame-to-frame processing time gap, and also the image sensor "blooming" effect...
October 5, 2015: Optics Express
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"