bluuebunny/crossref_metadata_2025 huggingface dataset:
Using the Transient Response of WO3 Nanoneedles under Pulsed UV Light in the Detection of NH3 and NO2
Authors: Gonzalez Oriol , Welearegay Tesfalem G. , Vilanova Xavier , Llobet Eduard
Published: April 2018

Here we report on the use of pulsed UV light for activating the gas sensing response of metal oxides. Under pulsed UV light, the resistance of metal oxides presents a ripple due to light-induced transient adsorption and desorption phenomena. This methodology has been applied to tungsten oxide nanoneedle gas sensors operated either at room temperature or under mild heating (50 °C or 100 °C). It has been found that by analyzing the rate of resistance change caused by pulsed UV light, a fast determination of gas concentration is achieved (ten-fold improvement in response time). The technique is useful for detecting both oxidizing (NO2) and reducing (NH3) gases, even in the presence of different levels of ambient humidity. Room temperature operated sensors under pulsed UV light show good response towards ammonia and nitrogen dioxide at low power consumption levels. Increasing their operating temperature to 50 °C or 100 °C has the effect of further increasing sensitivity.
Plasmonic Multichannel Refractive Index Sensor Based on Subwavelength Tangent-Ring Metal–Insulator–Metal Waveguide
Authors: Guo Zicong , Wen Kunhua , Hu Qinyang , Lai Wenhui , Lin Jiyan , Fang Yihong
Published: April 2018

In this paper, a multichannel refractive index sensor based on a subwavelength metal–insulator–metal (MIM) waveguide coupled with tangent-ring resonators is proposed. When two tangent-ring resonators were placed above the MIM waveguide, Fano resonance with asymmetrical line shape appeared in the transmission spectrum due to the interference between the light–dark resonant modes. The sensitivity and figure of merit were as high as 880 nm/RIU and 964, respectively. Through adding more tangent-ring resonators, multiple Fano resonances with ultrasharp peaks/dips were achieved in the wavelength range of 800–2000 nm. Besides, negative group delays were also observed in the Fano resonant dips. Two-dimensional finite-difference time-domain (FDTD) method was used to simulate and analyze the performances of the proposed structures. These kinds of multiring structures can find important applications in the on-chip optical sensing and optical communication areas.
Comparing Building and Neighborhood-Scale Variability of CO2 and O3 to Inform Deployment Considerations for Low-Cost Sensor System Use
Authors: Collier-Oxandale Ashley , Coffey Evan , Thorson Jacob , Johnston Jill , Hannigan Michael
Published: April 2018

The increased use of low-cost air quality sensor systems, particularly by communities, calls for the further development of best-practices to ensure these systems collect usable data. One area identified as requiring more attention is that of deployment logistics, that is, how to select deployment sites and how to strategically place sensors at these sites. Given that sensors are often placed at homes and businesses, ideal placement is not always possible. Considerations such as convenience, access, aesthetics, and safety are also important. To explore this issue, we placed multiple sensor systems at an existing field site allowing us to examine both neighborhood-level and building-level variability during a concurrent period for CO2 (a primary pollutant) and O3 (a secondary pollutant). In line with previous studies, we found that local and transported emissions as well as thermal differences in sensor systems drive variability, particularly for high-time resolution data. While this level of variability is unlikely to affect data on larger averaging scales, this variability could impact analysis if the user is interested in high-time resolution or examining local sources. However, with thoughtful placement and thorough documentation, high-time resolution data at the neighborhood level has the potential to provide us with entirely new information on local air quality trends and emissions.
Cooperative Monocular-Based SLAM for Multi-UAV Systems in GPS-Denied Environments
Authors: Trujillo Juan-Carlos , Munguia Rodrigo , Guerra Edmundo , Grau Antoni
Published: April 2018

This work presents a cooperative monocular-based SLAM approach for multi-UAV systems that can operate in GPS-denied environments. The main contribution of the work is to show that, using visual information obtained from monocular cameras mounted onboard aerial vehicles flying in formation, the observability properties of the whole system are improved. This fact is especially notorious when compared with other related visual SLAM configurations. In order to improve the observability properties, some measurements of the relative distance between the UAVs are included in the system. These relative distances are also obtained from visual information. The proposed approach is theoretically validated by means of a nonlinear observability analysis. Furthermore, an extensive set of computer simulations is presented in order to validate the proposed approach. The numerical simulation results show that the proposed system is able to provide a good position and orientation estimation of the aerial vehicles flying in formation.
An Improved BeiDou-2 Satellite-Induced Code Bias Estimation Method
Authors: Fu Jingyang , Li Guangyun , Wang Li
Published: April 2018

Different from GPS, GLONASS, GALILEO and BeiDou-3, it is confirmed that the code multipath bias (CMB), which originate from the satellite end and can be over 1 m, are commonly found in the code observations of BeiDou-2 (BDS) IGSO and MEO satellites. In order to mitigate their adverse effects on absolute precise applications which use the code measurements, we propose in this paper an improved correction model to estimate the CMB. Different from the traditional model which considering the correction values are orbit-type dependent (estimating two sets of values for IGSO and MEO, respectively) and modeling the CMB as a piecewise linear function with a elevation node separation of 10°, we estimate the corrections for each BDS IGSO + MEO satellite on one hand, and a denser elevation node separation of 5° is used to model the CMB variations on the other hand. Currently, the institutions such as IGS-MGEX operate over 120 stations which providing the daily BDS observations. These large amounts of data provide adequate support to refine the CMB estimation satellite by satellite in our improved model. One month BDS observations from MGEX are used for assessing the performance of the improved CMB model by means of precise point positioning (PPP). Experimental results show that for the satellites on the same orbit type, obvious differences can be found in the CMB at the same node and frequency. Results show that the new correction model can improve the wide-lane (WL) ambiguity usage rate for WL fractional cycle bias estimation, shorten the WL and narrow-lane (NL) time to first fix (TTFF) in PPP ambiguity resolution (AR) as well as improve the PPP positioning accuracy. With our improved correction model, the usage of WL ambiguity is increased from 94.1% to 96.0%, the WL and NL TTFF of PPP AR is shorten from 10.6 to 9.3 min, 67.9 to 63.3 min, respectively, compared with the traditional correction model. In addition, both the traditional and improved CMB model have a better performance in these aspects compared with the model which does not account for the CMB correction.
Feasibility Study on S-Band Microwave Radiation and 3D-Thermal Infrared Imaging Sensor-Aided Recognition of Polymer Materials from End-of-Life Vehicles
Authors: Huang Jiu , Zhu Zhuangzhuang , Tian Chuyuan , Bian Zhengfu
Published: April 2018

With the increase the worldwide consumption of vehicles, end-of-life vehicles (ELVs) have kept rapidly increasing in the last two decades. Metallic parts and materials of ELVs can be easily reused and recycled, but the automobile shredder residues (ASRs), of which elastomer and plastic materials make up the vast majority, are difficult to recycle. ASRs are classified as hazardous materials in the main industrial countries, and are required to be materially recycled up to 85–95% by mass until 2020. However, there is neither sufficient theoretical nor practical experience for sorting ASR polymers. In this research, we provide a novel method by using S-Band microwave irradiation together with 3D scanning as well as infrared thermal imaging sensors for the recognition and sorting of typical plastics and elastomers from the ASR mixture. In this study, an industrial magnetron array with 2.45 GHz irradiation was utilized as the microwave source. Seven kinds of ELV polymer (PVC, ABS, PP, EPDM, NBR, CR, and SBR) crushed scrap residues were tested. After specific power microwave irradiation for a certain time, the tested polymer materials were heated up to different extents corresponding to their respective sensitivities to microwave irradiation. Due to the variations in polymer chemical structure and additive agents, polymers have different sensitivities to microwave radiation, which leads to differences in temperature rises. The differences of temperature increase were obtained by a thermal infrared sensor, and the position and geometrical features of the tested scraps were acquired by a 3D imaging sensor. With this information, the scrap material could be recognized and then sorted. The results showed that this method was effective when the tested polymer materials were heated up to more than 30 °C. For full recognition of the tested polymer scraps, the minimum temperature variations of 5 °C and 10.5 °C for plastics and elastomers were needed, respectively. The sorting efficiency was independent of particle sizes but depended on the power and time of the microwave irradiation. Generally, more than 75% (mass) of the tested polymer materials could be successfully recognized and sorted under an irradiation power of 3 kW. Plastics were much more insensitive to microwave irradiation than elastomers. With this method, the tested mixture of the plastic group (PVC, ABS, PP) and the mixture of elastomer group (EPDM, NBR, CR, and SBR) could be fully separated with an efficiency of 100%.
Colorimetric Humidity Sensor Using Inverse Opal Photonic Gel in Hydrophilic Ionic Liquid
Authors: Kim Seulki , Han Sung Gu , Koh Young Gook , Lee Hyunjung , Lee Wonmok
Published: April 2018

We demonstrate a fast response colorimetric humidity sensor using a crosslinked poly(2-hydroxyethyl methacrylate) (PHEMA) in the form of inverse opal photonic gel (IOPG) soaked in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM+][BF4−]), a non-volatile hydrophilic room temperature ionic liquid (IL). An evaporative colloidal assembly enabled the fabrication of highly crystalline opal template, and a subsequent photopolymerization of PHEMA followed by solvent-etching and final soaking in IL produced a humidity-responsive IOPG showing highly reflective structural color by Bragg diffraction. Three IOPG sensors with different crosslinking density were fabricated on a single chip, where a lightly crosslinked IOPG exhibited the color change response over entire visible spectrum with respect to the humidity changes from 0 to 80% RH. As the water content increased in IL, thermodynamic interactions between PHEMA and [BMIM+][BF4−] became more favorable, to show a red-shifted structural color owing to a longitudinal swelling of IOPG. Highly porous IO structure enabled fast humidity-sensing kinetics with the response times of ~1 min for both swelling and deswelling. Temperature-dependent swelling of PHEMA in [BMIM+][BF4−] revealed that the current system follows an upper critical solution temperature (UCST) behavior with the diffraction wavelength change as small as 1% at the temperature changes from 10 °C to 30 °C.
A Review on Bacteriorhodopsin-Based Bioelectronic Devices
Authors: Li Yu-Tao , Tian Ye , Tian He , Tu Tao , Gou Guang-Yang , Wang Qian , Qiao Yan-Cong , Yang Yi , Ren Tian-Ling
Published: April 2018

Bacteriorhodopsin protein extracted from Halobacterium salinarum is widely used in many biohybrid electronic devices and forms a research subject known as bioelectronics, which merges biology with electronic technique. The specific molecule structure and components of bR lead to its unique photocycle characteristic, which consists of several intermediates (bR, K, L, M, N, and O) and results in proton pump function. In this review, working principles and properties of bacteriorhodopsin are briefly introduced, as well as bR layer preparation method. After that, different bR-based devices divided into photochemical and photoelectric applications are shown. Finally, outlook and conclusions are drawn to inspire new design of high-performance bR-based biohybrid electronic devices.
An Assessment of the Wind Power Generation Potential of Built Environment Wind Turbine (BEWT) Systems in Fort Beaufort, South Africa
Authors: Manyeredzi Terrence , Makaka Golden
Published: April 2018

The physical and economic sustainability of using built environment wind turbine (BEWT) systems depends on the wind resource potential of the candidate site. Therefore, it is crucial to carry out a wind resource assessment prior to the deployment of the BEWT. The assessment results can be used as a referral tool for predicting the performance and lifespan of the BEWT in the given built environment. To date, there is limited research output on BEWTs in South Africa, with available literature showing a bias towards utility-scale or conventional ground-based wind energy systems. This study aimed to assess the wind power generation potential of BEWT systems in Fort Beaufort using the Weibull distribution function. The results show that Fort Beaufort wind patterns can be classified as fairly good and that BEWTs can best be deployed at 15   m for a fairer power output as roof height wind speeds require BEWTs of very low cut-in speeds of at most 1.2   ms − 1 .
Smart Automation, Customer Experience and Customer Engagement in Electric Vehicles
Authors: Ullah Asad , Aimin Wang , Ahmed Mansoora
Published: April 2018

A major challenge to cleaner and more sustainable transportation is the lack of adoptability of electric vehicles (EVs) by customers. Therefore, most of the vehicles we see on the road use fossil fuel instead of sustainable green energy sources. One way to improve customer acceptance is to market EVs as a socially desirable product, rather than only environmentally friendly. The silver lining to promote is the potential of information and communications technology (ICT) features in EVs, which can lead to a deeper connection between the EVs and their users. These engaging technologies can bring customers closer to the company, resulting in generating big data, which can lead to even deeper insights into customer preferences. Because the technology of vehicle connectivity and automation is just taking off, it is important to understand how these technologies in EVs can enhance customer experiences and result in sustainable customer engagement. Unfortunately, this important research area remains neglected. This research, therefore, is focused on building a conceptual framework for understanding the influence of electric vehicle (EV) automation and connectivity on customer experience, and ultimately, customer engagement.
Performance Sustainability and Integrated Reporting: Empirical Evidence from Mandatory and Voluntary Adoption Contexts
Authors: Loprevite Salvatore , Ricca Bruno , Rupo Daniela
Published: April 2018

This paper looks at the topic of regulation of integrated reporting for listed companies, with the aim of contributing to the debate on the usefulness of introducing a mandatory regime, both from the perspective of integrated performance sustainability of companies and from that of relevance of information for providers of financial capital. The study is based on empirical research carried out on a sample composed of companies operating in territories where the adoption of integrated reporting is voluntary (Europe) and those operating in a country where adoption is mandatory (South Africa). The research shows that (a) in voluntary regimes, levels of integrated performance achieved by companies are higher; (b) mandatory regulation produces positive effects on integrated performance levels in the medium term; (c) integrated performance indicators are value-relevant, though having different levels of relevance under the two regimes examined.
Talking about Climate Change Mitigation: People’s Views on Different Levels of Action
Authors: Becker Sarah , Sparks Paul
Published: April 2018

Previous research has examined public views on climate change and pro-environmental behavior; however, there has been little focus on in-depth qualitative examination of views on mitigation strategies carried out by different social actors. This paper examines how people discuss strategies to mitigate climate change and the relative responsibilities of individuals, the UK government, and corporations. Twenty people were interviewed about what they thought should be done to reduce the degree of climate change. Three main themes in their responses are identified: (1) representations of climate change; (2) responsibility for action; and (3) opposing environmental and economic interests. Overall, there was support for a variety of climate change mitigation strategies. There was some emphasis on individual behavior change combined with suggestions about greater information provision and the importance of personal choice. Although some participants criticized economic and profit-oriented structures, there was a strong sense among participants that change in this regard was unlikely. An expansion of examples of alternative strategies to address climate change could contribute towards transcending individualized approaches and accentuate perceptions of possibilities for significant social change.
Spatial Changes of Urban Heat Island Formation in the Colombo District, Sri Lanka: Implications for Sustainability Planning
Authors: Ranagalage Manjula , Estoque Ronald C. , Zhang Xinmin , Murayama Yuji
Published: April 2018

The formation of surface urban heat islands (SUHIs) can cause significant adverse impacts on the quality of living in urban areas. Monitoring the spatial patterns and trajectories of UHI formations could be helpful to urban planners in crafting appropriate mitigation and adaptation measures. This study examined the spatial pattern of SUHI formation in the Colombo District (Sri Lanka), based on land surface temperature (LST), a normalized difference vegetation index (NDVI), a normalized difference built-up index (NDBI), and population density (PD) using a geospatial-based hot and cold spot analysis tool. Here, ‘hot spots’ refers to areas with significant spatial clustering of high variable values, while ‘cold spots’ refers to areas with significant spatial clustering of low variable values. The results indicated that between 1997 and 2017, 32.7% of the 557 divisions in the Colombo District persisted as hot spots. These hot spots were characterized by a significant clustering of high composite index values resulting from the four variables (LST, NDVI (inverted), NDBI, and PD). This study also identified newly emerging hot spots, which accounted for 49 divisions (8.8%). Large clusters of hot spots between both time points were found on the western side of the district, while cold spots were found on the eastern side of the district. The areas identified as hot spots are the more urbanized parts of the district. The emerging hot spots were in areas that had undergone landscape changes due to urbanization. Such areas are found between the persistent hot spots (western parts of the district) and persistent cold spots (eastern parts of the district). Generally, the spatial pattern of the emerging hot spots followed the pattern of urbanization in the district, which had been expanding from west to east. Overall, the findings of this study could be used as a reference in the context of sustainable landscape and urban planning for the Colombo District.
Towards Spatial Composite Indicators: A Case Study on Sardinian Landscape
Authors: Trogu Daniele , Campagna Michele
Published: April 2018

Composite Indicators (CIs) recently earned popularity as decision-support tool in policy-making for their ability to give concise measures of complex phenomena. Despite growing diffusion of the use of CI in policy-making, current research has barely addressed the issue of the spatial dimension of input data and of final indicator scores. Nowadays the spatial dimension of data plays a crucial role in analysis, thanks to recent developments in spatial data infrastructures which has enabled seamless access to a large amount of geographic information. In addition, recent developments in spatial statistical techniques are facilitating the understanding of the presence of spatial effects among data, spatial dependence and spatial heterogeneity. These advances are improving our ability to understand the spatial dimension of information, which is crucial to obtain a more robust representation of the territorial reality and insights of territorial dynamics in order to inform decisions in spatial planning and policy-making. This paper proposes an original method for the integration of spatial multivariate analysis and the use of spatial data to extend existing state of the art methods for CIs, as a step towards the construction of Spatial Composite Indicators. The method was successfully tested on a landscape planning case study.
Strongyloides stercoralis Hyperinfection in an HIV-Infected Patient Successfully Treated with Subcutaneous Ivermectin
Authors: Grossi Paolo Antonio , Lombardi Domenico , Petrolo Alessia , Rovelli Cristina , Di Rosa Zaira , Perriccioli Giorgio , Rossi Agostino , Minoja Giulio , Scaglione Francesco , Dalla Gasperina Daniela
Published: April 2018

A 39-year-old Ethiopian HIV-positive man with peripheral T-cell lymphoma developed Strongyloides stercoralis hyperinfection. The patient was initially treated with oral ivermectin for three weeks without response, most likely due to malabsorption because of concomitant paralytic ileus. Given the persistence of larvae in the body fluids, the worsening respiratory status and clinical malabsorption, veterinary parenteral formulation of ivermectin was administered. The very high plasma concentration of ivermectin achieved in the patient after parenteral administration led to a rapid improvement in his clinical condition and rapid disappearance of the parasite from biological samples, without any adverse reaction.
Mutation of CD2AP and SH3KBP1 Binding Motif in Alphavirus nsP3 Hypervariable Domain Results in Attenuated Virus
Authors: Mutso Margit , Morro Ainhoa Moliner , Smedberg Cecilia , Kasvandik Sergo , Aquilimeba Muriel , Teppor Mona , Tarve Liisi , Lulla Aleksei , Lulla Valeria , Saul Sirle , Thaa Bastian , McInerney Gerald M , Merits Andres , Varjak Margus
Published: April 2018

Infection by Chikungunya virus (CHIKV) of the Old World alphaviruses (family Togaviridae) in humans can cause arthritis and arthralgia. The virus encodes four non-structural proteins (nsP) (nsP1, nsp2, nsP3 and nsP4) that act as subunits of the virus replicase. These proteins also interact with numerous host proteins and some crucial interactions are mediated by the unstructured C-terminal hypervariable domain (HVD) of nsP3. In this study, a human cell line expressing EGFP tagged with CHIKV nsP3 HVD was established. Using quantitative proteomics, it was found that CHIKV nsP3 HVD can bind cytoskeletal proteins, including CD2AP, SH3KBP1, CAPZA1, CAPZA2 and CAPZB. The interaction with CD2AP was found to be most evident; its binding site was mapped to the second SH3 ligand-like element in nsP3 HVD. Further assessment indicated that CD2AP can bind to nsP3 HVDs of many different New and Old World alphaviruses. Mutation of the short binding element hampered the ability of the virus to establish infection. The mutation also abolished ability of CD2AP to co-localise with nsP3 and replication complexes of CHIKV; the same was observed for Semliki Forest virus (SFV) harbouring a similar mutation. Similar to CD2AP, its homolog SH3KBP1 also bound the identified motif in CHIKV and SFV nsP3.
Design Flood Estimation Methods for Cascade Reservoirs Based on Copulas
Authors: Guo Shenglian , Muhammad Rizwan , Liu Zhangjun , Xiong Feng , Yin Jiabo
Published: April 2018

Reservoirs operation alters the natural flow regime at downstream site and thus has a great impact on the design flood values. The general framework of flood regional composition and Equivalent Frequency Regional Composition (EFRC) method are currently used to calculate design floods at downstream site while considering the impact of the upstream reservoirs. However, this EFRC method deems perfect correlation between peak floods that occurred at one sub-basin and downstream site, which implicitly assumes that the rainfall and the land surface process are uniformly distributed for various sub-basins. In this study, the Conditional Expectation Regional Composition (CERC) method and Most Likely Regional Composition (MLRC) method based on copula function are proposed and developed under the flood regional composition framework. The proposed methods (i.e., CERC and MLRC) are tested and compared with the EFRC method in the Shuibuya-Geheyan-Gaobazhou cascade reservoirs located at Qingjiang River basin, a tributary of Yangtze River in China. Design flood values of the Gaobazhou reservoir site are estimated under the impact of upstream cascade reservoirs, respectively. Results show that design peak discharges at the Gaobazhou dam site have been significantly reduced due to the impact of upstream reservoir regulation. The EFRC method, not taking the actual dependence of floods occurred at various sub-basins into account; as a consequence, it yields an under-or overestimation of the risk that is associated with a given event in hydrological design. The proposed methods with stronger statistical basis can better capture the actual spatial correlation of flood events occurred at various sub-basins, and the estimated design flood values are more reasonable than the currently used EFRC method. The MLRC method is recommended for design flood estimation in the cascade reservoirs since its composition is unique and easy to implement.
Sub-Seasonal Snowpack Trends in the Rocky Mountain National Park Area, Colorado, USA
Authors: Fassnacht Steven R. , Venable Niah B.H. , McGrath Daniel , Patterson Glenn G.
Published: April 2018

We present a detailed study of the snowpack trends in the Rocky Mountain National Park (RMNP) using snow telemetry and snow course data at a monthly resolution. We examine the past 35 years (1981 to 2016) to explore monthly patterns over 36 locations and used some additional data to help interpret the changes. The analysis is at a finer spatial and temporal scale than previous studies that focused more on aggregate- or regional-scale changes. The trends in the first of the month’s snow water equivalent (SWE) varied more than the change in the monthly SWE, monthly precipitation or mean temperature. There was greater variability in SWE trends on the west side of the study area, and on average the declines in the west were greater. At higher elevations, there was more of a decline in the SWE. Changes in the climate were much less in winter than in summer. Per decade, the average decline in the winter precipitation was 4 mm and temperatures warmed by 0.29 °C, while the summer precipitation declined by 9 mm and temperatures rose by 0.66 °C. In general, November and March became warmer and drier, yielding a decline of the SWE on December 1st and April 1st, while December through February and May became wetter. February and May became cooler.
Ag2WO4 nanorods decorated with AgI nanoparticles: Novel and efficient visible-light-driven photocatalysts for the degradation of water pollutants
Authors: Li Shijie , Hu Shiwei , Jiang Wei , Liu Yanping , Liu Yu , Zhou Yingtang , Mo Liuye , Liu Jianshe
Published: April 2018

To develop efficient and stable visible-light-driven (VLD) photocatalysts for pollutant degradation, we synthesized novel heterojunction photocatalysts comprised of AgI nanoparticle-decorated Ag2WO4 nanorods via a facile method. Various characterization techniques, including XRD, SEM, TEM, EDX, and UV–vis DRS were used to investigate the morphology and optical properties of the as-prepared AgI/Ag2WO4 catalyst. With AgI acting as the cocatalyst, the resulting AgI/Ag2WO4 heterostructure shows excellent performance in degrading toxic, stable pollutants such as rhodamine B (RhB), methyl orange (MO) and para-chlorophenol (4-CP). The high performance is attributed to the enhanced visible-light absorption properties and the promoted separation efficiency of charge carriers through the formation of the heterojunction between AgI and Ag2WO4. Additionally, AgI/Ag2WO4 exhibits durable stability. The active species trapping experiment reveals that active species (O2•− and h+) dominantly contribute to RhB degradation. The AgI/Ag2WO4 heterojunction photocatalyst characterized in this work holds great potential for remedying environmental issues due to its simple preparation method and excellent photocatalytic performance.
Mechanochemistry of nucleosides, nucleotides and related materials
Authors: Eguaogie Olga , Vyle Joseph S , Conlon Patrick F , Gîlea Manuela A , Liang Yipei
Published: April 2018

The application of mechanical force to induce the formation and cleavage of covalent bonds is a rapidly developing field within organic chemistry which has particular value in reducing or eliminating solvent usage, enhancing reaction rates and also in enabling the preparation of products which are otherwise inaccessible under solution-phase conditions. Mechanochemistry has also found recent attention in materials chemistry and API formulation during which rearrangement of non-covalent interactions give rise to functional products. However, this has been known to nucleic acids science almost since its inception in the late nineteenth century when Miescher exploited grinding to facilitate disaggregation of DNA from tightly bound proteins through selective denaturation of the latter. Despite the wide application of ball milling to amino acid chemistry, there have been limited reports of mechanochemical transformations involving nucleoside or nucleotide substrates on preparative scales. A survey of these reactions is provided, the majority of which have used a mixer ball mill and display an almost universal requirement for liquid to be present within the grinding vessel. Mechanochemistry of charged nucleotide substrates, in particular, provides considerable benefits both in terms of efficiency (reducing total processing times from weeks to hours) and by minimising exposure to aqueous conditions, access to previously elusive materials. In the absence of large quantities of solvent and heating, side-reactions can be reduced or eliminated. The central contribution of mechanochemistry (and specifically, ball milling) to the isolation of biologically active materials derived from nuclei by grinding will also be outlined. Finally non-covalent associative processes involving nucleic acids and related materials using mechanochemistry will be described: specifically, solid solutions, cocrystals, polymorph transitions, carbon nanotube dissolution and inclusion complex formation.
Phase-dependent Photometric and Spectroscopic Characterization of the MASTER-Net Optical Transient J212444.87+321738.3: An Oxygen-rich Mira
Authors: Ghosh Supriyo , Mondal Soumen , Das Ramkrishna , Banerjee D. P. K. , Ashok N. M. , Hambsch Franz-Josef , Dutta Somnath
Published: April 2018

We describe the time-dependent properties of a new spectroscopically confirmed Mira variable, which was discovered in 2013 as MASTER-Net Optical Transient J212444.87+321738.3 toward the Cygnus constellation. We have performed long-term optical/near-infrared (NIR) photometric and spectroscopic observations to characterize the object. From the optical/NIR light curves, we estimate a variability period of 465 ± 30 days. The wavelength-dependent amplitudes of the observed light curves range from ΔI ∼ 4 mag to ΔK ∼ 1.5 mag. The (J − K) color index varies from 1.78 to 2.62 mag over phases. Interestingly, a phase lag of ∼60 days between optical and NIR light curves is also seen, as in other Miras. Our optical/NIR spectra show molecular features of TiO, VO, CO, and strong water bands that are a typical signature of oxygen-rich Mira. We rule out S- or C-type as ZrO bands at 1.03 and 1.06 μm and C2 band at 1.77 μm are absent. We estimate the effective temperature of the object from the Spectral Energy Distribution, and distance and luminosity from standard Period–Luminosity relations. The optical/NIR spectra display time-dependent atomic and molecular features (e.g., TiO, Na i, Ca i, H2O, CO), as commonly observed in Miras. Such spectroscopic observations are useful for studying pulsation variability in Miras.
The Absolute Reflectance and New Calibration Site of the Moon
Authors: Wu Yunzhao , Wang Zhenchao , Cai Wei , Lu Yu
Published: April 2018

How bright the Moon is forms a simple but fundamental and important question. Although numerous efforts have been made to answer this question such as use of sophisticated electro-optical measurements and suggestions for calibration sites, the answer is still debated. An in situ measurement with a calibration panel on the surface of the Moon is crucial for obtaining the accurate absolute reflectance and resolving the debate. China’s Chang’E-3 (CE-3) “Yutu” rover accomplished this type of measurement using the Visible-Near Infrared Spectrometer (VNIS). The measurements of the VNIS, which were at large emission and phase angles, complement existing measurements for the range of photometric geometry. The in situ reflectance shows that the CE-3 landing site is very dark with an average reflectance of 3.86% in the visible bands. The results are compared with recent mission instruments: the Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC), the Spectral Profiler (SP) on board the SELENE, the Moon Mineralogy Mapper (M3) on board the Chandrayaan-1, and the Chang’E-1 Interference Imaging Spectrometer (IIM). The differences in the measurements of these instruments are very large and indicate inherent differences in their absolute calibration. The M3 and IIM measurements are smaller than LROC WAC and SP, and the VNIS measurement falls between these two pairs. When using the Moon as a radiance source for the on-orbit calibration of spacecraft instruments, one should be cautious about the data. We propose that the CE-3 landing site, a young and homogeneous surface, should serve as the new calibration site.
The Near-infrared Tip of the Red Giant Branch. II. An Absolute Calibration in the Large Magellanic Cloud
Authors: Hoyt Taylor J. , Freedman Wendy L. , Madore Barry F. , Seibert Mark , Beaton Rachael L. , Hatt Dylan , Jang In Sung , Lee Myung Gyoon , Monson Andrew J. , Rich Jeffrey A.
Published: April 2018

We present a new empirical JHK absolute calibration of the tip of the red giant branch (TRGB) in the Large Magellanic Cloud (LMC). We use published data from the extensive Near-Infrared Synoptic Survey containing 3.5 million stars, 65,000 of which are red giants that fall within one magnitude of the TRGB. Adopting the TRGB slopes from a companion study of the isolated dwarf galaxy IC 1613, as well as an LMC distance modulus of μ
0 = 18.49 mag from (geometric) detached eclipsing binaries, we derive absolute JHK zero points for the near-infrared TRGB. For a comparison with measurements in the bar alone, we apply the calibrated JHK TRGB to a 500 deg2 area of the 2MASS survey. The TRGB reveals the 3D structure of the LMC with a tilt in the direction perpendicular to the major axis of the bar, which is in agreement with previous studies.
An Empirical Study of Contamination in Deep, Rapid, and Wide-field Optical Follow-up of Gravitational Wave Events
Authors: Cowperthwaite P. S. , Berger E. , Rest A. , Chornock R. , Scolnic D. M. , Williams P. K. G. , Fong W. , Drout M. R. , Foley R. J. , Margutti R. , Lunnan R. , Metzger B. D. , Quataert E.
Published: April 2018

We present an empirical study of contamination in wide-field optical follow-up searches of gravitational wave sources from Advanced LIGO/Virgo using dedicated observations with the Dark Energy Camera. Our search covered ∼56 deg2, with two visits per night, in the i and z bands, followed by an additional set of griz images three weeks later to serve as reference images for subtraction. We achieve 5σ point-source limiting magnitudes of i ≈ 23.5 and z ≈ 22.4 mag in the coadded single-epoch images. We conduct a search for transient objects that mimic the i − z color behavior of both red (i−z > 0.5 mag) and blue (i−z < 0 mag) kilonova emission, finding 11 and 10 contaminants, respectively. Independent of color, we identify 48 transients of interest. Additionally, we leverage the rapid cadence of our observations to search for sources with characteristic timescales of ≈1 day and ≈3 hr, finding no potential contaminants. We assess the efficiency of our search with injected point sources, finding that we are 90% (60%) efficient when searching for red (blue) kilonova-like sources to a limiting magnitude of i ≲ 22.5 mag. Using our efficiencies, we derive sky rates for kilonova contaminants of

deg−2 and

deg−2. The total contamination rate is

deg−2. We compare our results to previous optical follow-up efforts and comment on the outlook for gravitational wave follow-up searches as additional detectors (e.g., KAGRA, LIGO India) come online in the next decade.
Upper Limits on the Presence of Central Massive Black Holes in Two Ultra-compact Dwarf Galaxies in Centaurus A
Authors: Voggel Karina T. , Seth Anil C. , Neumayer Nadine , Mieske Steffen , Chilingarian Igor , Ahn Christopher , Baumgardt Holger , Hilker Michael , Nguyen Dieu D. , Romanowsky Aaron J. , Walsh Jonelle L. , Brok Mark den , Strader Jay
Published: April 2018

The recent discovery of massive black holes (BHs) in the centers of high-mass ultra-compact dwarf galaxies (UCDs) suggests that at least some are the stripped nuclear star clusters of dwarf galaxies. We present the first study that investigates whether such massive BHs, and therefore stripped nuclei, also exist in low-mass (M < 107
M
⊙) UCDs. We constrain the BH masses of two UCDs located in Centaurus A (UCD 320 and UCD 330) using Jeans modeling of the resolved stellar kinematics from adaptive optics data obtained with the SINFONI integral field spectrograph at the Very Large Telescope (VLT/SINFONI). No massive BHs are found in either UCD. We find a 3σ upper limit on the central BH mass in UCD 330 of M
• < 1.0 × 105
M
⊙, which corresponds to 1.7% of the total mass. This excludes a high-mass fraction BH and would only allow low-mass BHs similar to those claimed to be detected in Local Group globular clusters. For UCD 320, poorer data quality results in a less constraining 3σ upper limit of M
• < 1 × 106
M
⊙, which is equal to 37.7% of the total mass. The dynamical mass-to-light ratios of UCD 320 and UCD 330 are not inflated compared to predictions from stellar population models. The non-detection of BHs in these low-mass UCDs is consistent with the idea that elevated dynamical mass-to-light ratios do indicate the presence of a substantial BH. Although no massive BHs are detected, these systems could still be stripped nuclei. The strong rotation (v/σ of 0.3–0.4) in both UCDs and the two-component light profile in UCD 330 support the idea that these UCDs may be stripped nuclei of low-mass galaxies whose BH occupation fraction is not yet known.
Strategies for Integrating Global Awareness and Engagement Into Clinical Practice
Authors: Phillips Janet M. , Young Judith A.
Published: April 2018

Nurse educators are faced with the challenge of educating learners about global health for clinical practice, particularly as cultural diversity increases in their own communities. This third article in the four-part Teaching Tips series focuses on active teaching–learning strategies for global health awareness and engagement in clinical practice using interprofessional education global health competencies and evidence-based interactive teaching strategies. Tips and topic ideas are offered for integrating global awareness and engagement in both the academic and practice settings to prepare today's nurses for systems-based culturally competent care in clinical practice.

J Contin Nurs Educ.
2018;49(5):203–205.
Nurses' Perceptions and Practices Related to Alarm Management: A Quality Improvement Initiative
Authors: Cameron Hannah L. , Little Barbara
Published: April 2018

Background:

The purpose of this quality improvement project was to develop, implement, and assess the effects of an alarm management policy and educational program on nurses' perceptions and practices of alarm management in an acute care hospital.

Method:

Nurses from an acute care hospital in the southeastern United States attended a mandatory alarm management education program. The hospital implemented the evidence-based alarm management education to achieve the NPSG.06.01.01: Alarm Management. Pre- and posttests were administered to evaluate the education and the changes in nurses' perceptions and practices of clinical alarms.

Results:

A total of 417 nurses received the educational intervention. All participants completed the pretest, and 215 (51%) completed the voluntary posttest. Significant improvements were made in alarm perceptions and practices. Nurses suggested unit-specific alarm education, improved staffing, and updated equipment.

Conclusion:

Findings support the benefits of continued education in alarm management for nurses. Bedside nurses are a critical member of a multidisciplinary alarm management team because they are at the forefront of patient safety and most at risk for experiencing alarm fatigue.

J Contin Educ Nurs.
2018;49(5):207–215.
Preceptors' Perception of Role Competency
Authors: L'Ecuyer Kristine M. , Hyde Matthew J. , Shatto Bobbi J.
Published: April 2018

Background:

Many variables contribute to the success of nursing students and new nurses in their transition to practice. Clinical orientation and training usually falls to staff nurse preceptors. Inherent in this dynamic is the assumption that staff nurses are prepared and able to assume this responsibility. Ideal characteristics and attributes of preceptor competency have not been conclusively defined.

Method:

This qualitative study explored the defining attributes of preceptor role competency as described by preceptors who attended one of 44 continuing education preceptor academies over 9 years in Missouri.

Results:

Analysis revealed that communication, expertise, flexibility, evaluation skills, and patience are among the most important competencies of nurse preceptors.

Conclusion:

Understanding role expectations would benefit both preceptors and nurse educators who select, train, and support nurse preceptors. Identification of essential preceptor competencies can inform preceptor preparation courses and identify needs for continuing education of preceptors.

J Contin Educ Nurs.
2018;49(5):233–240.
Seasonality of planktonic crustacean decapod larvae in the subtropical waters of Gran Canaria Island, NE Atlantic
Authors: Landeira José M. , Lozano-Soldevilla Fernando
Published: April 2018

A monitoring programme was established to collect plankton samples and information of environmental variables over the shelf off the island of Gran Canaria during 2005 and 2006. It produced a detailed snapshot of the composition and seasonal assemblages of the decapod larvae community in this locality, in the subtropical waters of the Canary Islands (NE Atlantic), where information about crustacean phenology has been poorly studied. The larval community was mainly composed of benthic taxa, but the contribution of pelagic taxa was also significant. Infraorders Anomura (33.4%) and Caridea (32.8%) accounted for more than half the total collected larvae. High diversity, relatively low larval abundance throughout the year and weak seasonality characterized the annual cycle. However, in relation to the temporal dynamics of temperature, two distinct larval assemblages (cold and warm) were identified that correspond to periods of mixing and stratification of the water column. The results also indicate that larval release times and durations in the subtropical waters are earlier and longer than at other higher latitudes in the NE Atlantic. We detected the presence of larvae of six species that have not yet been reported from the Canary Islands (Pandalina brevirostris, Processa edulis, Necallianasa truncata, Parapenaeus longirostris, Crangon crangon, Nematopagurus longicornis). Finally, this study provides a baseline for future comparisons with respect to fishery pressure and climate variability in this subtropical region.
Enfants délaissés : mères sans-papiers. Pour une critique nécessaire de l’article 30 du projet de loi sur l’asile et l’immigration (second épisode)
Authors: Carayon Lisa
Published: April 2018

Dans un article précédent1, nous avons proposé une première analyse critique de l’article 30 du projet de loi asile et immigration présenté par le gouvernement et actuellement discuté au Parlement2. Nous avons montré comment ce projet, visant à contrôler l’établissement de la filiation des enfants dont l’un des deux parents est de nationalité étrangère, risque de priver certains enfants de leur filiation paternelle. Mais cet article 30 ne se limite pas à complexifier la procédure de reconnaissance d’un enfant, il modifie également les conditions que doivent remplir les parents étrangers d’enfants français pour obtenir un titre de séjour.
Mathematical Modeling of Human Capital Evolution at Micro and Macroeconomic Level
Authors: Simion Dalia , Berceanu Dorel
Published: April 2018

Knowledge of human potential and especially labor resources implies a system of indicators, a quantitative and qualitative analysis that is complex and truthful at all levels. Human resources are changing in size and features in an organization. We intend to represent the human resources of an organization and the changes they undergo by using mathematical modeling, differential equations and even default probabilities.
Multi-Criteria Decision-Making Tools for Selection Photovoltaic Modules
Authors: Demian Gabriela , Demian Mihai , Radu Stefan , Dubovan Sandu
Published: April 2018

This paper presents aplying a multi-criteria decision methods to evaluate an optimum photovoltaic module for the construction of a solar park. In this work, seven number of alternative of photovoltaic modules and four criteria for selection is used for the optimal solution. The result from the research demonstrate which of the analyzed PV modules is the most convenient to be used for construction of a solar park.
Transdisciplinarity - A New Vision in Forming Specialists in the Field of Environmental Engineering - Case Study
Authors: Ghermec Olimpia , Gavrilescu Elena , Ghermec Christian
Published: April 2018

The complexity of industrial activities, the requests regarding the integrated pollution prevention and control, the development of the eco-design, the growth of the environmental performance and of the energetic efficiency, all of these need specialists trained in Universities, in the field of environmental engineering. The field of study of Environmental Engineering is considered both multidisciplinary and interdisciplinary. In the paper it is shown the necessity of a new approach of this field through transdisciplinarity. The case study refers to the relation between transdisciplinarity and the systems of renewable energy.