batterydata/paper-abstracts huggingface dataset:
An electrochemical sensor modified with a molecularly imprinted polymer (MIP) and carboxyl-functionalized multi-walled carbon nanotubes (MWCNT-COOH) was developed for the sensitive and selective detection of diuron in river water samples. An MIP was obtained by bulk polymerization using the best monomer (methacrylic acid) selected by computational simulation. The surface characteristics of the MIP and NIP (control polymer) samples were evaluated by means of surface area and pore volume determinations, using the BET method. The adsorption efficiency of the MIP was determined in adsorption tests that revealed high adsorption, relative to the control polymer. In addition, MWCNTs functionalized with carboxyl groups were used to enhance the performance of the sensor. Electrochemical studies of diuron using the MIP and MWCNT-COOH immobilized on a carbon paste electrode were performed with wave square voltammetry (SWV). The analytical parameters pH, buffer composition, and amounts of MWCNT-COOH and MIP were investigated and optimized. Excellent results were obtained with a linear range of between 5.2×10−8 and 1.25×10−6 molL−1, detection limit of 9.0×10−9 molL−1, and sensitivity of 5.1×105 μALmol−1. The MWCNT-COOH-MIP/CPE showed an enhanced electrochemical response, with sensitivity 7.9-fold greater than for a plain carbon paste electrode (CPE). Application of the sensor using river water samples resulted in recoveries between 96.1 and 99.5% and RSD <5% (n=3), demonstrating the reliability of this device.
The main issue of Si anode is the large volume variations during alloying/dealloying processes, which severely causes the disintegration in the pre-designed conductive and mechanical networks and the interfacial contact between the current collector and Si particles; moreover, it can hardly be overcome economically. Here, the growth methodology of ultrathin graphdiyne nanosheets is scalably developed for in-situ constructing the 3D all-carbon conductive and mechanical networks and firstly enhancing the interfacial contact between current collector and Si anode via chemical bonding. Seamlessly hold by the ultrathin graphdiyne nanosheets, the disintegrations of the silicon anodes in the conductive networks and the interfacial contact are effectively retarded; as a result, the silicon electrode shows impressive enhancements in term of the capacity (2300 mA h g–1), and long-term stability for high-energy-density battery (1343 W h l–1). Such method shows great promises for realizing the commercial-level applications of Si anode.
Acoustic telemetry has been used with great success to quantify the movements of marine fishes in open habitats, however research has begun to focus on patterns of movement and habitat usage within more structurally complex habitats. To date, there has been no detailed assessment of the performance of acoustic telemetry within seagrass, which forms a crucial nursery and foraging habitat for many fish species globally. Information on the detection range of acoustic receivers within seagrass is essential to guide receiver array design, particularly positioning systems. Here, we compare detection ranges for transmitters (Vemco V7) within and above the seagrass to determine impacts on the performance of a Vemco Positioning System (VPS). We also investigate the influence of environmental conditions (i.e. wind, time of day, background noise, atmospheric pressure and depth) on detection probability.
In response to a growing consensus in the auto industry that ultracapacitors can potentially play a key role in the modern vehicle power distribution network, a task force was created at the United States Advanced Battery Consortium (USABC) to tackle issues facing the fledging industry. The task force embarked on first developing and establishing standards for performance and abuse tolerance of ultracapacitors in collaboration with the U.S. Department of Energy and National Labs. Subsequently, potential applications in the automotive industry were identified and a consensus requirement specification was drawn as a development guide for the industry.
The mechanisms whereby solid oxides can react with hydrogen and water are discussed. The potential range in which lithium-containing phases are stable in water can be calculated using the Gibbs triangle. Examples from the literature are cited. Materials with potentials above the water stability window will tend to react with water vapor in the atmosphere, absorbing protons and electrons. High potential solids can also be used to extract lithium from aqueous solutions. Experiments on the effect of the exposure of Pr6O11 to water on the insertion of lithium are reported.
Charge lost per unit surface area of a silicon electrode due to the formation of solid-electrolyte-interphase (SEI) layer during initial lithiation was quantified, and the species that constitute this layer were identified. Coin cells made with Si thin-film electrodes were subjected to a combination of galvanostatic and potentiostatic lithiation and delithiation cycles to accurately measure the capacity lost to SEI layer formation. While the planar geometry of amorphous thin films allows accurate calculation of surface area, creation of additional surface by cracking was prevented by minimizing the thickness of the Si film. The cycled electrodes were analyzed with X-ray photoelectron spectroscopy to characterize the composition of the SEI layer. The charge lost due to SEI formation measured from coin cell experiments was found to be in good agreement with the first-cycle capacity loss during the initial lithiation of a Si(100) crystal with planar geometry. The methodology presented in this work is expected to provide a useful practical tool for battery-material developers in estimating the expected capacity loss due to first cycle SEI layer formation and in choosing an appropriate particle size distribution that balances mechanical integrity and the first cycle capacity loss in large volume expansion electrodes for lithium-ion batteries.
In this work, a significant difference in Li2S phase structure, depending on the discharge rate, is reported for lithium sulfur (Li–S) batteries, and their performances are interpreted in terms of the phase structures. The production of crystalline Li2S is preferred at a low discharge rate, while the formation of amorphous Li2S is favored at a high discharge rate. The differences in the morphologies of the charged electrodes and the charging overvoltages demonstrate that the amorphous Li2S is more easily oxidized to soluble PS during charging compared to the crystalline Li2S. Impedance spectroscopic analysis reveals a faster Li ion diffusion through the amorphous Li2S discharge product is responsible for the smaller overvoltage and higher reversibility at the higher discharge rate. The slower capacity fade rate at a higher discharge rate indicates the importance of the Li2S phase structure on Li–S battery performances. The formation of amorphous Li2S is more favored with cycling, which provides a feasible explanation for widely observed capacity saturation behavior.
Atmospheric nutrient deposition has contributed to widespread changes in sensitive seminatural ecosystems throughout Europe. For an understanding of underlying processes it is important to quantify input–output flows in relation to ongoing atmospheric inputs and current management strategies. In this study we quantified losses of N, P, Ca, Mg, and K via leaching in heathland ecosystems (Lüneburger Heide, NW Germany) as a function of current deposition rates and different management measures (mowing, prescribed burning, choppering, sod-cutting) which aim to prevent shrub and tree encroachment. Leaching was only moderately related to atmospheric input rates, indicating that leaching was mostly affected by internal turnover processes. Leaching significantly increased for most of the nutrients after the application of management measures, particularly in the choppered and sod-cut plots. However, atmospheric nutrient inputs exceeded leaching outputs for most of the nutrients, even in the plots subjected to management. Despite high deposition rates (20–25 kg N ha−1 year−1), retention of atmospheric N input ranged between 74% and 92% in the control plots. In the treated plots, N retention decreased to 59–80%. However, in the study area mean N leaching in the controls has almost doubled since 1980 and currently amounts to 3.7 kg ha−1 year−1, indicating an early stage of N saturation. Our study provides evidence that leaching did not compensate for atmospheric nutrient deposition, particularly as regards N. Management, thus, will be an indispensable tool for the maintenance of the low-nutrient status as a prerequisite for the long-term preservation of heathland ecosystems.
Vehicle-to-Anything, or V2X, is a term which references technologies that use the energy in the batteries of plug-in electric vehicles (PEVs) for any purpose outside the vehicle. The purpose of this document is to provide a comprehensive and current review of concepts, recently published studies, and demonstration projects/deployments of V2X technology from around the world. While the focus will be kept on recently published studies and current technological developments, some historical perspective and important project reports from earlier periods of V2X development will be included for context. The report is broken down into sections focusing on different classes of V2X service: services to overall regional grid stability and reliability (V2G); reliability and backup energy supply services to individual homes or buildings (V2H); and studies focusing on services to commercial buildings generally inapplicable to residential houses (V2B). Attention will be paid to the operational strategy of the reviewed articles, which reflect a broad spectrum of optimization approaches and objectives.
Indium-Selenide thin-films have been prepared by the thermal-evaporation technique at a pressure of 4.5×10−6 torr and a temperature of 673–873 K. For both the as-deposited and annealed films, (i) the electrical conductivity increased with increasing temperature and (ii) the variation of activation energy follows the island structure theory. The temperature co-efficient of resistance (T.C.R.) and Hall-effect measurements indicate that the sample is a n-type carrier. The optical spectra for both types of films were obtained in the wavelength range 0.3<λ<2.5 μm, and by comparing the magnitude of transmittance spectra, it is found that the annealed films are more transparent than the as-deposited ones in the UV and visible range. The integrated transmittance and reflectance values were obtained: the high values of T lum and T sol for the annealed films suggest that indium selenide may be used in selective-surface devices.
It is now well accepted that charge transport through Li2O2 is a serious limitation in Li–O2 batteries. We report formation energies for the different charge states of Li, O and O2 vacancies in Li2O2 that could have important implications for charge transport through Li2O2. Charge transition levels are given as a function of the location of the Fermi level in Li2O2 relative to the valence band maximum (VBM). We argue that in Li–O2 discharge/charge electrochemistry, the Fermi level is pinned by LiO2 interface states at ∼0.35 eV above the VBM and this causes the vacancies to be in positively charged states (weakly violating local charge neutrality). We show by non-equilibrium Greens function calculations of charge transport through a Au|Li2O2 + VLiq |Au metal–insulator–metal structure (with VLiq a Li vacancy of charge state q), that the +1 and 0 charge state induces considerable scattering for tunneling holes. This tunneling is the previously proposed dominant mechanism of charge transport in Li–O2 batteries at practical current densities at room temperature, although we also proposed a contribution from hole polaron migration at very low currents and higher temperatures. We suggest that scattering of the tunneling holes by the positively charged vacancies (and possibly hole polarons) is the origin of the resistive loss observed in Li–O2 discharges in bulk electrolysis cells (where other forms of resistance are negligible). Thus, we argue that charged vacancies hinder charge transport through Li2O2 in Li–O2 electrochemical discharges.
Globalization of markets and new business practices are prompting high-tech firms to reconsider their competitive strategy. The increasing complexity of technologies in addition to shorter product life cycles are also forcing firms to rely on R&D as a source of strategy. More importantly, firms are inclined to evaluate their technologies from a portfolio's perspective in which a set or a sub-set of R&D projects is evaluated together, in relation to each other. Portfolio techniques can help strategic managers in evaluating whether a portfolio of products is adequate from the perspective of long-term corporate growth and profitability. Obviously, when R&D projects are evaluated relative to one another, technical capability management of such projects must be carried out concurrently. In this paper, R&D Project Portfolio Matrix is used as a tool for analyzing a portfolio of R&D projects by linking competitive advantages of a firm to benefits these projects may provide to customers. Examples of batteries for electric vehicles (EV) and hybrid electric vehicles (HEV) are provided to illustrate how such a matrix is used, and some of the implications for innovation management of such projects.
NH3 is a precursor of PM2.5 which deteriorates urban air quality, affects human health and impacts the global radiation budget. Since vehicles are important sources of NH3 in urban areas, we have satisfactorily studied the possibility of measuring NH3 emissions from gasoline and SCR-equipped diesel light-duty vehicles during real driving on-road operation using a portable FTIR. The performance of the portable FTIR resulted to be comparable to that of a laboratory-based FTIR during a series of experiments performed in the Vehicle Emission Laboratory (VELA) using the World-harmonized Light-duty Test Cycle (WLTC). Higher on-road NH3 emission factors were obtained for the gasoline vehicle than for the diesel. High NOx emissions were measured from the diesel vehicle, indicating a low efficiency of the DeNOx system, SCR. On-road NH3 emission factors were ∼2 times lower than during the laboratory tests at 23 °C for both vehiclesNH3 emissions were not observed for the diesel vehicle during cold start operation. However, NH3 cold start emissions from the gasoline vehicle were up to 2 orders of magnitude higher than during the entire road trips, ranging from 45 to 134 mg km−1. Cold start emissions are of paramount importance as they commonly take place in urban areas. Hence, future urban reductions in PM2.5 might need to take into consideration the introduction of NH3 emissions limits for passenger cars.
Graphene-based hybrid nanostructures could offer many opportunities for improved lithium storage performance. Herein, we report a facile synthesis of mesoporous CoO nanorods (CoO NRs) on a reduced graphene oxide (rGO) substrate by hydrothermal and calcination treatment. Transmission electron microscopy (TEM) investigation reveals that the CoO NRs with a diameter of 20–60nm are tightly anchored on the surface of rGO sheets. Compared to pure CoO NRs, the CoO NRs/rGO composite shows higher lithium storage capacity and superior rate capability as anode materials for Li-ion batteries. The CoO NRs/rGO composite delivers an initial discharge capacity of 1452 mAh g−1, and it can still remains 960 mAh g−1 after 50 cycles at 0.1 A g−1. After each 10 cycles at 0.1, 0.2, 0.5, and 1 A g−1, the specific capacities of the composite are about 1096, 1049, 934 and 513 mAh g−1, respectively. The enhanced electrochemical performance of the composite is closely related to its unique structure, such as 1D mesoporous morphology of CoO NRs and its tightly-contacting with rGO nanosheets, which could shorten the transport pathway for both electrons and ions, enhance the electrical conductivity and accommodate the volume expansion during prolonged cycling.
Electrochemical impedance spectra for battery electrodes are usually interpreted using models that assume isotropic active particles, having uniform current density and symmetric diffusivities. While this can be reasonable for amorphous or polycrystalline materials with randomly oriented grains, modern electrode materials increasingly consist of highly anisotropic, single-crystalline, nanoparticles, with different impedance characteristics. In this paper, analytical expressions are derived for the impedance of anisotropic particles with tensorial diffusivities and orientation-dependent surface reaction rates and capacitances. The resulting impedance spectrum contains clear signatures of the anisotropic material properties and aspect ratio, as well as statistical variations in any of these parameters.
Measuring the diagnostic accuracy (DA) of an EEG device is unconventional and complicated by imperfect interrater reliability. We sought to compare the DA of a miniature, wireless, battery-powered EEG device (“microEEG”) to a reference EEG machine in emergency department (ED) patients with altered mental status (AMS). Two hundred twenty-five ED patients with AMS underwent 3 EEGs. Two EEGs, EEG1 (Nicolet Monitor, “reference”) and EEG2 (microEEG) were recorded simultaneously with EEG cup electrodes using a signal splitter. The remaining study, EEG3, was recorded with microEEG using an electrode cap immediately before or after EEG1/EEG2. The official EEG1 interpretation was considered the gold standard (EEG1-GS). EEG1, 2, and 3 were de-identified and blindly interpreted by two independent readers. A generalized mixed linear model was used to estimate the sensitivity and specificity of these interpretations relative to EEG1-GS and to compute a diagnostic odds ratio (DOR). Seventy-nine percent of EEG1-GS were abnormal. Neither the DOR nor the κf representing interrater reliabilities differed significantly between EEG1, EEG2, and EEG3. The mean setup time was 27min for EEG1/EEG2 and 12min for EEG3. The mean electrode impedance of EEG3 recordings was 12.6kΩ (SD: 31.9kΩ). The diagnostic accuracy of microEEG was comparable to that of the reference system and was not reduced when the EEG electrodes had high and unbalanced impedances. A common practice with many scientific instruments, measurement of EEG device DA provides an independent and quantitative assessment of device performance.
Stages five and six of the TRIPP model require previously assessed laboratory preventive measures (stages three and four) to be put into place in the field and to assess their effectiveness in a real-world context. In a controlled setting like a laboratory, it is very easy to equate and control for factors such as training loads, exposure to interventions, and the like. However, when we move to a real football team, for example, it is now necessary to work within time and workload restrictions from coaches, players, and a timetable that is largely dictated by someone other than the researchers. Moreover, there are other factors that cannot also be controlled, such as the physical environment, player and coach attitudes and opinions, weather and other factors. In the case of implementing a training programme into community-level football teams through the “Preventing Australian Football Injuries through eXercise” (PAFIX) project, it was necessary that the programme incorporated exercises and principles that had been shown to work in the laboratory in both 6- and 12-week training studies into a twenty-eight week periodised programme; that covers the entire season and 8 weeks of pre-season. Firstly, this required progressions of exercises that were achievable by a wide range of player abilities, up-skilling of trainers to deliver those exercises and providing ongoing support to those trainers responsible for implementing the programmes. Secondly, a field test battery needed to be designed to provide surrogate measures of the more complicated laboratory procedures that were not possible to conduct in the field. Though a difficult task, this was achievable by using sound laboratory-based tests, evidence and findings and applying these in the field to track the changes that may occur as a result of the interventions being trialed.
We conducted a longitudinal study examining the role of phonemic awareness, phonological processing, and grammatical skills in the development of reading and spelling abilities in Greek. A battery of cognitive, linguistic, and literacy tasks was administered to 131 primary school children (65 7-year-olds and 66 9-year-olds) and was repeated in the following year (8- and 10-year-olds, respectively). Phoneme awareness, speech rate, and rapid automatized naming (RAN) were concurrent predictors of reading rate at Time 1 (T1), and speech rate was a longitudinal predictor of reading rate at Time 2 (T2) when reading at T1 was controlled. The predictors of spelling differed from those of reading; phoneme awareness and speech rate predicted concurrent attainments at T1, and phoneme awareness was a robust longitudinal predictor. Despite the differences in the degree of transparency between the Greek and English orthographies, phoneme awareness predicts variations in learning to read and spell in both languages.
A new synthetic route of LiNi0.5Mn0.5O2 was proposed (named ‘hydroxide mud method’), much more simplified synthetic method without filtering, washing and repeated heat treatment processes. By dropping LiOH to the aqueous solution of metal (Ni, Mn) nitrates, hydroxides of metals were precipitated and the resulting solution was evaporated as received (without filtering or washing of the precipitate). The dried mixture was added with ethyl alcohol (to dissolve and disperse Li salts) and processed with specially devised three-step heat treatment. Synthesized material showed no impurity phase (examined by X-ray diffraction, XRD) and high discharge capacity about 175mAh/g (3–4.6V cut-off voltage range).
Perovskite solar cells based on CH3NH3PbI3 and related materials have reached impressive efficiencies that, on a lab scale, can compete with established solar cell technologies, at least in short-term observations. Despite frequently voiced concerns about the solubility of the lead salts that make up the absorber material, several life cycle analyses have come to overall positive conclusions regarding the environmental impact of perovskite solar cell (PSC) production. Their particularly short energy payback time (EBPT) in comparison to other established PV technologies makes them truly competitive. Several studies have identified valuable components such as FTO, gold and high temperature processes as the most significant contributors to the environmental impact of PSCs. Considering these findings, we have developed a rapid dismantling process allowing the recovery of all major components, saving raw materials, energy and production time in the fabrication of recycled PSCs. We demonstrate that the performance of PSCs fabricated from recycled substrates can compete with that of devices fabricated from virgin materials.