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https://www.readbyqxmd.com/read/28438001/noise-reduction-in-third-order-cross-correlation-by-angle-optimization-of-the-interacting-beams
#1
V A Schanz, F Wagner, M Roth, V Bagnoud
We report on a novel technique to reduce the noise level in scanning third order cross-correlation. Large angles between the interacting beams combined with adapted crystal parameters lead to a significant decrease of noise photon generation while maintaining efficient generation of the third order signal. An enhanced scanning cross-correlator was developed based on the new technique proposed. In tests at the PHELIX laser facility this novel correlator performed within a dynamic range of 12.5 orders of magnitude...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437985/scattering-of-surface-plasmon-polaritons-at-a-planar-interface-by-an-embedded-dielectric-nanocube
#2
Seojun Lee, Hyungchae Kim, Jongcheon Lee, Changsoon Kim
We investigate scattering of surface plasmon polaritons (SPPs) at a planar metal-dielectric interface by a dielectric nanocube embedded in the metal layer using finite element method-based simulations. The scattering characteristics of the embedded nanocube, such as the scattering and absorption cross sections, far-field scattering patterns, reflectance, and transmittance, are calculated as functions of the wavelength of the incident SPP waves in the visible range. The main features of the characteristics are explained in connection with the excitation of plasmonic eigenmodes of the embedded nanocube...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437968/vortex-energy-flows-generated-by-core-shell-nanospheres
#3
Shih-Wen Chen, Jia-Han Li
Investigated in this paper is the interaction of light and the nanospheres composed by a dielectric core with a gold-shell cladding that causes the optical vortices inside the core and the whirlpools around the shell. Different radius ratios, dimensions and the dielectric functions of nanospheres were studied using the finite-difference time-domain method. It was found that optical vortices were most likely to occur in the regions of increased absorption cross section and reduced scattering cross section. Two optical vortices of the opposite polarity, each centered in one of the particles of a dimer are created by a nanoshell dimer...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437966/energy-scaling-and-extended-tunability-of-terahertz-wave-parametric-oscillator-with-mgo-doped-near-stoichiometric-linbo-sub-3-sub-crystal
#4
Yuye Wang, Longhuang Tang, Degang Xu, Chao Yan, Yixin He, Jia Shi, Dexian Yan, Hongxiang Liu, Meitong Nie, Jiachen Feng, Jianquan Yao
A widely tunable, high-energy terahertz wave parametric oscillator based on 1 mol. % MgO-doped near-stoichiometric LiNbO<sub>3</sub> crystal has been demonstrated with 1064 nm nanosecond pulsed laser pumping. The tunable range of 1.16 to 4.64 THz was achieved. The maximum THz wave output energy of 17.49 μJ was obtained at 1.88 THz under the pump energy of 165 mJ/pulse, corresponding to the THz wave conversion efficiency of 1.06 × 10<sup>-4</sup> and the photon conversion efficiency of 1...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437952/real-time-observation-of-round-trip-resolved-spectral-dynamics-in-a-stabilized-fs-fiber-laser
#5
Bowen Li, Ying Yu, Xiaoming Wei, Yiqing Xu, Kevin K Tsia, Kenneth K Y Wong
Fiber-stretcher based phase-lock loop (PLL) is a mature technique in fiber mode-locked lasers for repetition-rate stabilization. However, undesired side effects may be induced if not properly handled, which is easily overlooked owing to the lack of single-shot spectral analyzers. Thanks to the ultrafast spectral analyzing capability of optical time-stretch, an intriguing spectral dynamics is observed in a repetition-rate-stabilized nonlinear polarization rotation (NPR) mode-locked laser. Under the dynamic state, the optical spectra of pulses undergo dramatic evolution in every round trip while the pulse energy is relatively constant...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437914/a-sagnac-fourier-spectrometer
#6
Matthias Lenzner, Jean-Claude Diels
A spectrometer based on a Sagnac interferometer, where one of the mirrors is replaced by a transmission grating, is introduced. Since the action of a transmission grating is reversible, both directions experience the same diffraction at a given wavelength. At the output, the crossed wavefronts are imaged onto a camera, where their Fizeau fringe pattern is recorded. Each spectral element produces a unique spatial frequency, hence the Fourier transform of the recorded interferogram contains the spectrum. Since the grating is tuned to place zero spatial frequency at a selected wavelength, the adjoining spectrum is heterodyned with respect to this wavelength...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437903/real-time-broadband-radio-frequency-spectrum-analyzer-based-on-parametric-spectro-temporal-analyzer-pasta
#7
Liao Chen, Yuhua Duan, Haidong Zhou, Xi Zhou, Chi Zhang, Xinliang Zhang
A real-time broadband radio frequency (RF) spectrum analyzer is proposed and experimentally demonstrated to rapidly measure the RF spectrum of broadband optical signal. Cross phase modulation in the highly-nonlinear fiber is used to convert the RF spectrum carried by the pump to the optical spectrum of the probe signal, then the optical spectrum is real-time analyzed with the parametric spectro-temporal analyzer (PASTA) technology. The system performances are investigated in detail, including bandwidth, resolution, frame rate, and dynamic range...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437854/is-there-sufficient-evidence-for-a-causal-association-between-antiretroviral-therapy-and-diabetes-in-hiv-infected-patients-a-meta-analysis
#8
REVIEW
Chidozie U Nduka, Saverio Stranges, Peter K Kimani, Ahmed M Sarki, Olalekan A Uthman
BACKGROUND: The association of antiretroviral therapy (ART) with diabetes is inconsistent and varies widely across primary epidemiological studies. A comprehensive and more precise estimate of this association is fundamental to establishing a plausible causal link between ART and diabetes. METHODS: We identified epidemiological studies that compared mean fasting plasma glucose (FPG) concentrations and proportions of diabetes and metabolic syndrome between HIV-infected patients naïve and exposed to ART...
April 24, 2017: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/28437846/pain-sensitization-is-associated-with-disease-activity-in-rheumatoid-arthritis-patients-a-cross-sectional-study
#9
Yvonne C Lee, Clifton O Bingham, Robert R Edwards, Wendy Marder, Phillips Kristine, Marcy B Bolster, Daniel J Clauw, Larry W Moreland, Bing Lu, Alyssa Wohlfahrt, Zhi Zhang, Tuhina Neogi
OBJECTIVE: Pain sensitization may contribute to pain severity in rheumatoid arthritis (RA), impacting assessment of disease activity. We examined whether pain processing mechanisms were associated with disease activity among RA patients with active disease. METHODS: This study includes 139 subjects enrolled in the Central Pain in Rheumatoid Arthritis cohort. Subjects underwent quantitative sensory testing (QST), including assessment of pressure pain thresholds (PPTs) at multiple sites, conditioned pain modulation, and temporal summation...
April 24, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28437836/nurses-attitudes-toward-the-single-checking-of-medications
#10
Rachel Cross, Paul N Bennett, Cherene Ockerby, Wei Chun Wang, Judy Currey
BACKGROUND AND AIM: The policy of single over double checking of medications has been adopted by many health services; however, nurses' attitudes toward single-checking medications remains unclear. The aim of this study was to explore the attitudes of nurses who single check and administer medications in a setting where single checking has been in place for over a decade. METHODS: A cross-sectional survey design using the validated Single Checking Administration Medication Scale-II to registered nurses (n = 299) working in one metropolitan teaching hospital in Victoria, Australia...
April 24, 2017: Worldviews on Evidence-based Nursing
https://www.readbyqxmd.com/read/28437788/high-prevalence-of-polycystic-ovary-syndrome-in-type-1-diabetes-mellitus-adolescents-is-there-a-difference-depending-on-the-nih-and-rotterdam-criteria
#11
Kanetee Busiah, Ana Colmenares, Maud Bidet, Nadia Tubiana-Rufi, Claire Levy-Marchal, Christine Delcroix, Paul Jacquin, Delphine Martin, Lila Benadjaoud, Evelyne Jacqz-Aigrain, Kathleen Laborde, Jean-Jacques Robert, Dinane Samara-Boustani, Michel Polak
BACKGROUND: Polycystic ovary syndrome (PCOS) is more frequently observed in type 1 diabetes mellitus (T1DM) adult women than in nondiabetic women. No such prevalence has yet been studied in adolescent girls with T1DM. AIM: The aim of this study was to evaluate the prevalence of PCOS in adolescent girls with T1DM and to determine the clinical and hormonal features associated with the disorder. METHODS: A cross-sectional study of 53 adolescent girls (gynecological age >2 years) referred for routine evaluation for T1DM was conducted...
April 24, 2017: Hormone Research in Pædiatrics
https://www.readbyqxmd.com/read/28437765/suicidality-associated-with-ptsd-depression-and-disaster-recovery-status-among-adult-survivors-8-years-after-the-2008-wenchuan-earthquake-in-china
#12
Jing Guo, Huan He, Mingqi Fu, Ziqiang Han, Zhiyong Qu, Xiaohua Wang, Liding Guan
It has been eight years since the Wenchuan earthquake. We don't know how the lives of those affected by the disaster may remain blighted by its effects, or how many remain thus affected. The aim of the present study was to examine the relationship of disaster exposure, PTSD, depression and suicidal behaviors, using data from a cross-sectional survey conducted in earthquake-affected areas of China. 1369 participants were recruited from two different sites that were severely affected by the Wenchuan earthquake...
April 12, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28437763/depression-and-insomnia-as-mediators-of-the-relationship-between-distress-and-quality-of-life-in-cancer-patients
#13
Kyeong Min Cha, Young Ki Chung, Ki Young Lim, Jae Sung Noh, Mison Chun, So Yeon Hyun, Dae Ryong Kang, Min Jung Oh, Nam Hee Kim
BACKGROUND: Distress in cancer patients leads to poorer quality of life (QOL) and negatively impacts survival. For efficient management of a patient's disease course, the interrelationships among distress, depression, insomnia, and QOL must be understood. This study aimed to investigate whether depression and insomnia mediate the relationship between distress and QOL in cancer patients. METHODS: Cancer patients referred to a specialized psycho-oncology clinic (n=208) participated in this study...
April 17, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28437762/public-attitudes-toward-depression-and-help-seeking-impact-of-the-ospi-europe-depression-awareness-campaign-in-four-european-regions
#14
Elisabeth Kohls, Evelien Coppens, Juliane Hug, Eline Wittevrongel, Chantal Van Audenhove, Nicole Koburger, Ella Arensman, András Székely, Ricardo Gusmão, Ulrich Hegerl
BACKGROUND: Public attitudes toward depression and help-seeking behaviour are important factors influencing depressed people to obtain professional help and adequate treatment. OSPI-Europe is a multi-level suicide prevention programme including a public awareness campaign. It was implemented in four regions of four European countries (Germany, Hungary, Ireland and Portugal). This paper reports the results of the evaluation of the campaign, including its visibility and effects of the campaign on stigma associated with depression and help-seeking behaviour...
April 8, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28437761/negative-appraisals-and-fear-extinction-are-independently-related-to-ptsd-symptoms
#15
Daniel V Zuj, Matthew A Palmer, Kate E Gray, Chia-Ming K Hsu, Emma L Nicholson, Gin S Malhi, Richard A Bryant, Kim L Felmingham
BACKGROUND: Considerable research has revealed impaired fear extinction to be a significant predictor of PTSD. Fear extinction is also considered the primary mechanism of exposure therapy, and a critical factor in PTSD recovery. The cognitive theory of PTSD proposes that symptoms persist due to excessive negative appraisals about the trauma and its sequelae. Research has not yet examined the relationship between fear extinction and negative appraisals in PTSD. METHODS: A cross-sectional sample of participants with PTSD (n =21), and trauma-exposed controls (n =33) underwent a standardized differential fear conditioning and extinction paradigm, with skin conductance response (SCR) amplitude serving as the index of conditioned responses...
April 17, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28437760/the-effects-of-object-height-and-visual-information-on-the-control-of-obstacle-crossing-during-locomotion-in-healthy-older-adults
#16
Sho Kunimune, Shuichi Okada
In order to safely avoid obstacles, humans must rely on visual information regarding the position and shape of the object obtained in advance. The present study aimed to reveal the duration of obstacle visibility necessary for appropriate visuomotor control during obstacle avoidance in healthy older adults. Participants included 13 healthy young women (mean age: 21.5±1.4years) and 15 healthy older women (mean age: 68.5±3.5years) who were instructed to cross over an obstacle along a pressure-sensitive pathway at a self-selected pace while wearing liquid crystal shutter goggles...
April 13, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28437730/the-practice-of-prosecuting-child-maltreatment-results-of-an-online-survey-of-prosecutors
#17
Theodore P Cross, Debra Whitcomb
Despite efforts by advocates, practitioners, and legislators to alleviate the burden on child maltreatment victims in the criminal justice system, many challenges remain for prosecutors as they seek to hold offenders accountable while minimizing the emotional impact on children. More than 200 state and local prosecutors in 37 states responded to an online survey to share their perspectives on current challenges, procedures to support children in the adjudication process, and the impact of the U.S. Supreme Court opinion in Crawford v...
April 21, 2017: Child Abuse & Neglect
https://www.readbyqxmd.com/read/28437701/a-high-performance-and-highly-controllable-core-shell-imprinted-sensor-based-on-the-surface-enhanced-raman-scattering-for-detection-of-r6g-in-water
#18
Hongji Li, Jiaqi Jiang, Zirun Wang, Xiaonan Wang, Xiqing Liu, Yongsheng Yan, Chunxiang Li
A novel, sensitive sensor material combined the technique of surface enhance Raman scattering (SERS) and molecular imprinting was prepared. It was used the amino-functionalized SiO2 nanospheres as the supporting materials and anchored Ag nanoparticles on the surface by the function of coordination between Ag(+) and NH2(-). Then, it was used that the Rhodamine 6G (R6G) as the template, acrylamide (AM) as functional monomer, ethyleneglycol dimethacrylate (EGDMA) as cross-linker, 2,2'-azobis(2-methylpropionitrile) (AIBN) as initiator to prepare the core-shell molecular imprinted polymers...
April 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28437694/the-benefits-of-paid-maternity-leave-for-mothers-post-partum-health-and-wellbeing-evidence-from-an-australian-evaluation
#19
Belinda Hewitt, Lyndall Strazdins, Bill Martin
This paper investigates the health effects of the introduction of a near universal paid parental leave (PPL) scheme in Australia, representing a natural social policy experiment. Along with gender equity and workforce engagement, a goal of the scheme (18 weeks leave at the minimum wage rate) was to enhance the health and wellbeing of mothers and babies. Although there is evidence that leave, especially paid leave, can benefit mothers' health post-partum, the potential health benefits of implementing a nationwide scheme have rarely been investigated...
April 14, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28437688/application-of-near-infrared-spectroscopy-for-the-rapid-quality-assessment-of-radix-paeoniae-rubra
#20
Hao Zhan, Jing Fang, Liying Tang, Hongjun Yang, Hua Li, Zhuju Wang, Bin Yang, Hongwei Wu, Meihong Fu
Near-infrared (NIR) spectroscopy with multivariate analysis was used to quantify gallic acid, catechin, albiflorin, and paeoniflorin in Radix Paeoniae Rubra, and the feasibility to classify the samples originating from different areas was investigated. A new high-performance liquid chromatography method was developed and validated to analyze gallic acid, catechin, albiflorin, and paeoniflorin in Radix Paeoniae Rubra as the reference. Partial least squares (PLS), principal component regression (PCR), and stepwise multivariate linear regression (SMLR) were performed to calibrate the regression model...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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