bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mining social networks to improve suicide prevention: A scoping review
Authors: Lopez‐Castroman Jorge , Moulahi Bilel , Azé Jérôme , Bringay Sandra , Deninotti Julie , Guillaume Sebastien , Baca‐Garcia Enrique 
Published: February 2019

AbstractAttention about the risks of online social networks (SNs) has been called upon reports describing their use to express emotional distress and suicidal ideation or plans. On the Internet, cyberbullying, suicide pacts, Internet addiction, and “extreme” communities seem to increase suicidal behavior (SB). In this study, the scientific literature about SBs and SNs was narratively reviewed. Some authors focus on detecting at‐risk populations through data mining, identification of risks factors, and web activity patterns. Others describe prevention practices on the Internet, such as websites, screening, and applications. Targeted interventions through SNs are also contemplated when suicidal ideation is present. Multiple predictive models should be defined, implemented, tested, and combined in order to deal with the risk of SB through an effective decision support system. This endeavor might require a reorganization of care for SNs users presenting suicidal ideation.
Determination of trace amounts of aromatic amines after magnetic solid‐phase extraction using silver‐modified Fe3O4/graphene nanocomposite
Authors: Alasl Mohammad Reza Kashefi , Sohrabi Mahmoud Reza , Davallo Mehran 
Published: February 2019

AbstractIn this work, a fast and simple magnetic dispersive solid phase extraction methodology was developed utilizing Ag@magnetite nanoparticles@graphene nanocomposite as an efficient magnetic nanosorbent for preconcentration and determine of five aromatic amines in water samples. The sorbent was characterized by diverse characterization techniques. After the extraction, high‐performance liquid chromatography with UV detection was utilized to analysis the aromatic amines. The effects of different factors on the extraction process were studied thoroughly via design of experiment and desirability function. Detection limits and linear dynamic ranges were obtained in the range of 0.10–0.20 and 0.3–300 μg/L, respectively. The relative standard deviations (n = 5) were in the range of 4.3–6.5%. Eventually, the method was employed for determination of target aromatic amines in various water samples.
Greater sage‐grouse response to bentonite mining
Authors: Pratt Aaron C. , Beck Jeffrey L. 
Published: February 2019

ABSTRACTThe greater sage‐grouse (Centrocercus urophasianus; sage‐grouse) has undergone range contraction and population decline because of anthropogenic land surface disturbances; yet, there is little information on the effects of mining on sage‐grouse populations. In the Bighorn Basin of Montana and Wyoming, USA, bentonite mining is a growing source of surface disturbance that contributes to loss of sagebrush (Artemisiaspp.) habitat. We evaluated the response of sage‐grouse to active and reclaimed bentonite mining, relative to nesting, brood‐rearing, adult breeding, and adult winter habitat, through resource selection and habitat‐specific mortality risk analyses, based on female sage‐grouse (n = 321) monitored with telemetry from 2011–2015. A greater proportion of our monitored sample was exposed to mining disturbance during winter (65%) than during other seasons (range = 25%–34%). We observed avoidance of all mining disturbance for selection of nesting habitat (n = 378 nests), adult breeding habitat (n = 1,978 locations), and adult winter habitat (n = 1,365 locations). Evidence was inconclusive for avoidance of mining for brood‐rearing habitat (n = 754 locations). We also observed increased adult breeding season mortality risk (n = 62 mortality events;n = 285 female sage‐grouse) associated with active mining disturbance but observed no effect on nest success (n = 207 mortality events;n = 378 nests). Evidence was inconclusive for increased mortality risk associated with broods (n = 48 mortality events;n = 157 broods) and adults during winter (n = 31 mortality events;n = 220 female sage‐grouse). Stakeholders in the Bighorn Basin should be flexible and proactive to minimize the negative effects of bentonite mining on sage‐grouse habitat use and demographic rates. Stakeholders should prioritize the conservation of winter habitats because of the influence on a greater proportion of the population and because of the lower regulatory priority given to winter habitat and they should strive to perfect mining reclamation to return disturbed sites back to pre‐disturbance conditions to minimize long‐term effects of the mines on sage‐grouse. © 2019 The Wildlife Society.
Slow Cooling of High‐Energy C Excitons Is Limited by Intervalley‐Transfer in Monolayer MoS2
Authors: Li Yuanzheng , Shi Jia , Chen Heyu , Mi Yang , Du Wenna , Sui Xinyu , Jiang Chuanxiu , Liu Weizhen , Xu Haiyang , Liu Xinfeng 
Published: February 2019

AbstractHigh‐energy C exciton in 2D transition metal dichalcogenides with strong photon absorption can be utilized prospectively in light‐harvesting and opto‐electric devices. Here, a detailed study on C exciton dynamics in monolayer MoS2 is presented by femtosecond transient absorption (TA) spectroscopy. In the experiment, the C exciton with unique parallel band structure exhibits a slow process within tens of picoseconds (≈10–50 ps) as well as a fast process within several picoseconds (≈1–6 ps) instead of previous reported ultrafast cooling (<500 fs) process. From TA spectroscopy, the experimental results confirmed that the relatively slow cooling of C exciton is mainly limited by the rates of intervalley transfer rather than Pauli blocking effect from band‐edge excitons. The timescale of intervalley transfer is longer than that of intraband relaxation of C exciton, therefore, leading to the slow cooling of C exciton. Moreover, intervalley transfer time are estimated with two processes of 5.1 ± 0.6 ps and 69.5 ± 8 ps when the pump fluence is ≈127 µJ cm−2. This work provides further understanding of the ultrafast dynamics of C exciton in monolayer MoS2 and opens new opportunities for opto‐electric related applications.
On Ricci negative solvmanifolds and their nilradicals
Authors: Deré Jonas , Lauret Jorge 
Published: February 2019

AbstractIn the homogeneous case, the only curvature behavior which is still far from being understood is Ricci negative. In this paper, we study which nilpotent Lie algebras admit a Ricci negative solvable extension. Different unexpected behaviors were found. On the other hand, given a nilpotent Lie algebra, we consider the space of all the derivations such that the corresponding solvable extension has a metric with negative Ricci curvature. Using the nice convexity properties of the moment map for the variety of nilpotent Lie algebras, we obtain a useful characterization of such derivations and some applications.
Amelioration of Dystonic Opisthotonus in Pantothenate Kinase‐Associated Neurodegeneration Syndrome with Absent “Eye‐of‐the‐Tiger” Sign Following Bilateral Pallidal Deep Brain Stimulation
Authors: Mohd Fauzi Nor Amelia , Mohamed Ibrahim Norlinah , Mohamed Mukari Shahizon Azura , Jegan Thanabalan , Abdul Aziz Zariah 
Published: February 2019

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Exome sequencing in 51 early onset non‐familial CRC cases
Authors: Thutkawkorapin Jessada , Lindblom Annika , Tham Emma 
Published: February 2019

AbstractBackgroundColorectal cancer (CRC) cases with an age of onset <40 years suggests a germline genetic cause. In total, 51 simplex cases were included to test the hypothesis of CRC as a mendelian trait caused by either heterozygous autosomal dominant or bi‐allelic autosomal recessive pathogenic variants.MethodsThe cohort was whole exome sequenced (WES) at 100× coverage. Both a dominant‐ and recessive model were used for searching predisposing genetic factors. In addition, we assayed recessive variants of potential moderate risk that were enriched in our young‐onset CRC cohort. Variants were filtered using a candidate cancer gene list or by selecting variants more likely to be pathogenic based on variant type (e.g., loss‐of‐function) or allele frequency.ResultsWe identified one pathogenic variant in PTEN in a patient subsequently confirmed to have a hereditary hamartoma tumor syndrome (Cowden syndrome) and one patient with a pathogenic heterozygous variant in PMS2 that was originally not identified by WES due to low quality reads resulting from pseudogenes. In addition, we identified three heterozygous candidate missense variants in known cancer susceptibility genes (BMPR1A, BRIP1, and SRC), three truncating variants in possibly novel cancer genes (CLSPN, SEC24B, SSH2) and four candidate missense variants in ACACA, NR2C2, INPP4A, and DIDO1. We also identify five possible autosomal recessive candidate genes: ATP10B, PKHD1, UGGT2, MYH13, TFF3.ConclusionTwo clear pathogenic variants were identified in patients that had not been identified clinically. Thus, the chance of detecting a hereditary cancer syndrome in patients with CRC at young age but without family history is 2/51 (4%) and therefore the clinical benefit of genetic testing in this patient group is low. Of note, using stringent filtering, we have identified a total of ten candidate heterozygous variants and five possibly biallelic autosomal recessive candidate genes that warrant further study.
Effects of MTNR1B genetic variants on the risk of type 2 diabetes mellitus: A meta‐analysis
Authors: Shen Ling‐long , Jin Yin 
Published: February 2019

AbstractBackgroundWhether melatonin receptor 1B (MTNR1B) variants are associated with type 2 diabetes mellitus (T2DM) remains unclear. Therefore, we performed this meta‐analysis to better explore correlations between MTNR1B variants and T2DM.MethodsLiterature research was performed in PubMed, Medline, and Embase. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated.ResultsTotally 21 studies were enrolled to analyses. Pooled overall analyses showed that MTNR1B rs10830963 variant was significantly correlated with the susceptibility to T2DM (allele model: p = 0.02, OR = 0.97, 95% CI 0.95–1.00). Further subgroup analyses by ethnicity of participants revealed that rs10830963 variant was significantly correlated with the susceptibility to T2DM in South Asians, but not in Caucasians or East Asians. No any other positive results were found in overall and subgroup analyses.ConclusionsOur findings indicated that MTNR1B rs10830963 variant might serve as a genetic biomarker of T2DM, especially in South Asians.
Gracilis musculotendinous free flap for lower extremity reconstruction after surgical removal of malignant tumors: A report of five cases
Authors: Pedreira Rachel , Calotta Nicholas A. , Deune E. Gene 
Published: February 2019

BackgroundLower extremity reconstruction is challenging because of the need to restore form and function. Despite the many options for soft‐tissue coverage, little research has addressed combined tendon and soft‐tissue reconstitution. We present a series of patients undergoing lower extremity tendon reconstruction and wound coverage with a single free gracilis flap and its tendon.MethodsWe studied five patients (age range, 51–81 years) undergoing lower limb reconstruction for defects involving soft tissue and tendon between 1998 and 2016 in the senior author's practice. Wounds (all in the foot and ankle region) were caused by sarcoma (n = 4) and Merkel cell carcinoma (n = 1) and ranged from 6.5–10 × 8–12 cm. Donor tendons, 2–18 cm long, were used to reconstruct the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and extensor retinaculum. Patient characteristics and outcomes were reviewed retrospectively.ResultsReconstructions used a gracilis muscle free flap and its tendon. Flap sizes ranged 5–6.5 × 11–14 cm. Complications were one case of cellulitis and one case of reoperation for flap thinning and tenolysis. All patients had at least 7 months of follow‐up (mean: 37 months; range: 7–104 months). At latest follow‐up, all patients were ambulatory. On average, patients resumed assisted ambulation 27 days postoperatively and unassisted ambulation 62 days postoperatively.ConclusionsFor complex wounds with soft‐tissue and tendinous defects, the gracilis muscle free flap may be a reconstructive option. We recommend it be considered as a single‐donor incision option for lower extremity reconstruction.
Nanoplasmonic concurrent dual band antennas using metal‐insulator‐metal step impedance resonators
Authors: Chityala Ravi Kiran 
Published: February 2019

AbstractNanoplasmonic antennas are the one of the major elements in the recognition of upcoming nanoscale wireless communication systems. In this paper, the design and analysis of two multiband antennas operating at optical bands O and L bands, using metal‐insulator‐metal (MIM) slot waveguide based step impedance resonators (SIRs) and coplanar waveguide (CPW) fed line has been investigated. The simulation results of the two antennas (A) and (B) are obtained by using full wave simulation software (CST Microwave Studio Suite) with the return loss −20 dB and −30.79 dB at desired optical bands. The antenna (A) has a gain of 8 dBi and 7.48 dBi at 1275 nm and 1616 nm wavelengths, similarly antenna (B) has a gain of 8.46 dBi and 6.23 dBi at 1294 nm and 1613 nm wavelengths. The radiation pattern of the simulated results shows the omnidirectional pattern at desired wavelengths, which is very useful for nanoscale wireless communication systems.
A comparative study of high‐power low‐pass filters for satellite communications
Authors: Ala Ramin , Ahmadi Behzad 
Published: February 2019

AbstractTwo different types of low‐pass filters, including the waffle‐iron and the tapered corrugated waveguide filter, are designed at the same frequency band to provide an in‐depth vision of their superiorities and applications. The wide‐band nature of these structures finds applications in satellite communications which needs low‐loss filters. Both filters are built and measurements are performed. Multipaction simulations are also performed. Good agreement is observed between simulation and measurement results. Specifications of them such as size, spurious‐free region, power handling, and multipactor are presented in the comparative data and examinations.
An X‐band single‐pull class A/B power amplifier in 0.18 μm CMOS
Authors: Trinh Van‐Son , Park Jung‐Dong 
Published: February 2019

AbstractWe report a compact single‐pull X‐band power amplifier (PA) operating at the class AB utilizing on‐chip transformers in 0.18‐μm 1P6M CMOS technology. Designed X‐band PA includes the interstage matching network and the output power combiner by utilizing on‐chip transformers to achieve small area occupation with improved power added efficiency (PAE). A series RC network is employed between gate and drain of the MOS to provide stable operation with improved bandwidth. The designed PA measures the saturated output power of 18 dBm while the achieved power gain is 19.2 dB at 8 GHz. The output 1‐dB gain compression point (OP1dB) is 14.9 dBm, and the peak PAE is measured to be 22.6% under the supply of 1.8 V. The core chip size is 0.43 mm2 excluding the pads.
A solar‐powered 2.4 GHz injection‐locked oscillator for RF amplification
Authors: Wu Jian‐Ming , Yang Zong‐Ying , Ke Sian‐Wei 
Published: February 2019

AbstractA 2.4 GHz solar‐powered injection‐locked oscillator (ILO) is developed to boost harvested low‐power radiofrequency (RF) signals for energy harvesting applications. This work proposes a solar‐powered ILO with self‐powering that has a high power efficiency. A solar panel with a regulator circuit directly converts solar power into the electrical power of the ILO. The presented ILO design is based on a single‐ended Clapp oscillator. A direct injection method is used to reduce the power that is consumed by the ILO. The ILO is designed and implemented using Agilent's GaAs HEMT ATF55143. Measurements of the solar‐powered ILO are made and its amplification, or gain, performance is studied; the gain is 18.7 dB. The supply voltage that is applied to the ILO is 1.5 V and the power consumption (PDC) is 1.5 mW.
A planar end‐fire circularly polarized complementary Yagi antenna
Authors: Dong Gaoya , Wang Weimin , Liu Yuanan 
Published: February 2019

AbstractA novel end‐fire circularly polarized (CP) antenna is presented by integrating a vertically polarized magnetic Yagi array, a horizontally polarized electric Yagi array, various lengths of the directors and common driven elements. Slots with nine Jesus crosses are etched on the common driven elements to extend the impedance matching bandwidth of magnetic Yagi array, while various length of directors are employed to obtain wide axial ratio (AR) bandwidth. The designed CP antenna is both numerically and experimentally validated, and experimental results agree well with electromagnetic simulated results. The fractional impedance bandwidth for ∣S
11∣ < 10 dB is up to 20.7%, and AR bandwidth of less than 3 dB is up to 16.0% in fraction.
Microstrip quad‐channel diplexer using quad‐mode square ring resonators
Authors: Zhang Jinli , Pang Doudou , Wang Wei , He Ming , Chen Haihua , Ji Lu 
Published: February 2019

AbstractA new compact microstrip quad‐channel diplexer using quad‐mode square ring resonators (QMSRRs) is proposed. The quad‐channel diplexer is composed of two QMSRRs. A structure consists of two QMSRRs together with one common input and two output coupling lines is proposed, which can remove the matching network and therefore reduce the absolute size of the diplexer. The proposed QMSRR has two transmission zeros at the frequencies between the four resonant frequencies, which can be controlled by changing the length and impedance ratio of the QMSRR. Simulation and measurement results show that the resultant diplexer is of a small circuit size and a high isolation.
Onion‐bulb patterns predict acquired or inherited demyelinating polyneuropathy
Authors: Tracy Jennifer A. , Dyck Peter J. , Klein Christopher J. , Engelstad JaNean K. , Meyer Jane E. , Dyck P. James B. 
Published: February 2019

ABSTRACTIntroductionOnion‐bulbs (OB) are concentrically layered Schwann‐cell processes, surrounding nerve fibers, occurring in both inherited and acquired demyelinating polyneuropathies. We investigated whether OB patterns (generalized, mixed, or focal) correlate with acquired or inherited neuropathies.MethodsOne hundred thirty‐one OB‐rich nerve biopsies were graded for OB pattern and inflammation without knowledge of clinical history. We classified inherited (n = 49) or acquired (n = 82) neuropathies based solely on clinical history.ResultsFifty‐one biopsies had generalized (34 inherited vs. 17 acquired, P < 0.001), 54 mixed (48 acquired vs. 6 inherited, P < 0.001), and 26 focal/multifocal (inherited [n = 9], acquired [n = 17]) OB. Inflammation occurred more frequently in acquired (n = 54) than inherited (n = 14) neuropathy (P = 0.004).DiscussionGeneralized OB correlates with inherited neuropathy; mixed OB with acquired. Inflammation occurs more in acquired neuropathy cases. OB patterns are best explained by ubiquitous Schwann‐cell involvement in inherited and multifocal Schwann‐cell involvement in acquired neuropathies and predict the electrophysiology of uniform demyelination in inherited and unequal demyelination in acquired neuropathies. Muscle Nerve 59:665–670, 2019
Numerical and theoretical research on stress distribution in the loosening zone of the trapdoor problem
Authors: Liang Luju , Xu Changjie 
Published: February 2019

SummaryThe traditional theory of soil arching effect was developed on the assumption that stress distribution in the loosening zone is uniform. However, because of the deflection of principal stress' direction, the stress distribution in the loosening zone is actually ununiform. For the evaluation of principal stress axis deflection and stress redistribution, a discrete element method numerical model of trapdoor problem is established for the simulation of soil arching effect. Based on the numerical results, an arc shape of major principal stress trajectory and uniform horizontal stress distribution at the same depth of the loosening zone are adopted. An analytical model is raised to estimate the average loosening earth pressure acting on the trapdoor and stress distribution in the loosening zone at a limit state. In addition, comparison studies are carried out between the predictions of the proposed solutions and discrete element method numerical results as well as available model test results, thereby validating the accuracy of the proposed theoretical model. Both numerical and theoretical results indicate that the vertical stress distribution in the loosening zone is obviously ununiform. The load acting in the middle of loosening zone is transferred toward two sides so that the vertical stress distribution in loosening zone is concave.
Electrical properties, cyclic voltammetry, and anticancer activities of N‐(4‐(2‐hydrazinyl‐2‐oxoethoxy)phenyl) acetamide complexes
Authors: Morsi Reham M.M. , Mandour Howida S. , Fathi Ahlam M. , Awad Hanem M. 
Published: February 2019

AbstractA series of Cu (II), Mn (II), Co (II), Zn (II), Cr (III), and VO (IV) complexes with N‐(4‐(2‐hydrazinyl‐2‐oxoethoxy)phenyl) acetamide (HL) were synthesized. The electrical properties of HL and its Cu (II), Co (II), Zn (II), and Cr (III) complexes were measured in the 298 to 373 K temperature range. The activation energy of each of these metal complexes was estimated. The conductivities of the metal complexes with HL increase with increasing temperature, revealing their semiconducting nature and potential for use in electronic devices. The complexes exhibited higher conductivities than HL itself. The kinetic parameters of these complexes, such as their stability constants (Kc values) and Gibbs free energies (∆G°), were investigated by using cyclic voltammetry. These parameters indicated that the prepared compounds exhibited better stability and adsorption properties than paracetamol (PA), which is the parent compound of these species. The complexes were more cytotoxic than the ligand towards MCF‐7 human breast cancer cells.