Densities and viscosities of water (1) + 1-butyl-3-methylimidazolium tetrafluoroborate (2) were measured over the entire mole fraction range from (303.15 to 353.15) K. From these data, excess molar volumes (VE), viscosity deviations (Δη) calculated. The VE Δη fitted Redlich−Kister equation using a multiparametric nonlinear regression method. Estimated coefficients standard deviation calculated experimental data are also presented. results show that densities dependent strongly on content....

Travel time uncertainty has significant impacts on individual activity-travel scheduling, but at present these have not been considered in most accessibility studies. In this paper, an evaluation framework is proposed for urban areas with uncertain travel times. A reliable space-time service region (RSTR) model introduced to represent the of a facility under uncertainty. Based RSTR model, four place-based measures are evaluate services by incorporating effects reliability. To demonstrate...

A compound resonant cavity-type single longitudinal mode erbium-doped fiber laser is proposed and verified in this paper. We use a four-cavity to expand the spacing of homemade grating F-P filter saturable absorber narrow gain spectral bandwidth, enabling operate single-frequency state. Through theoretical analysis experimental verification important roles main constructed parts, center wavelength output 1550.06 nm obtained, optical signal-to-noise ratio 65 dB. In 50 minute period,...

Purpose Electronic learning (e‐learning) has gradually become an important part of university education. There is a trend among universities in Taiwan to offer more and e‐learning courses. The effectiveness teaching or system can be quantified by multi‐criteria measures. purpose this study was evaluate the measures linguistic preferences. Design/methodology/approach A generalized quantitative evaluation model that considers both interdependence fuzziness subjective perception currently...

Clustering the trajectories of vehicles moving on road networks is a key data mining technique for understanding human mobility patterns, as well their interactions with urban environments. The development efficient and scalable trajectory clustering algorithms, however, still faces challenges because computational costs when measuring similarities among large number network-constrained trajectories. To address this problem, novel framework based well-developed Density-Based Spatial...

How to identify key nodes is a challenging and significant research issue in complex networks. Some existing evaluation indicators of node importance have the disadvantages limited application scope one-sided results. This paper takes advantage multiple centrality measures comprehensively, by regarding identification as multi-attribute decision making (MADM) problem. Firstly, new local (NLC) measure put forward through considering multi-layer neighbor clustering coefficients. Secondly,...

Combining the ideas and advantages of intuitionistic fuzzy set (IFS) hesitant (HFS), dual (DHFS) could express uncertain complex information given by decision makers (DMs) in a more flexible manner. By virtue existing measure methods, elements DHFSs should be equal length thus some values must added into shorter according to risk preference DMs. The extension will increase subjectivity decision-making extent, different methods may produce results. In order address this issue, we first...

The research reported in this article began as a staff development project which teachers of Grades 3–11 produced multimedia projects, conducted similar their own classes, and showed students’ projects at conference. Researchers acted participant observers, providing technical support the students carried out projects. Research questions focused on attitudes toward science gender differences expertise, process taking responsibility for learning. Data qualitative study represented 3 points...

The Space-time prism (STP) is a key concept in time geography for analyzing human activity-travel behavior under various constraints. Most existing time-geographic studies use straightforward algorithm to construct STPs road networks by using two one-to-all shortest path searches. However, this can introduce considerable computational overhead, given the fact that accessible links STP are generally small portion of whole network. To address issue, an efficient geo-computational algorithm,...

The application of the continuous ejection technique to observe unimolecular dissociation metastable organometallic ions in a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer is demonstrated. A radio-frequency voltage continuously applied at frequency corresponding exact adduct ion, [MC6H6+]* (M = Cr and Mn), formed reactions Cr+ Mn+ with C6H6. By monitoring initial metal intensity as function time, lifetimes rate constants are obtained. bond energies D0(Cr+−C6H6) 1.75 ±...

The gas-phase reactions of Fe(CH2O)+ and Fe(CH2S)+ with a series aliphatic alkanes were studied by Fourier transform ion cyclotron resonance (FTICR) mass spectrometry. Like bare Fe+, C−C insertion, particularly terminal is predominant for the Fe(CH2O)+, while C−H insertion preferred Fe(CH2S)+. About 90% reaction products are formed small alkane loss. For Fe(CH2S)+, after initial proposed mechanism includes hydrogen transfer to sulfur, followed migratory methylene into metal−alkyl bond...

Let W be a string of length n over an alphabet Σ, k positive integer, and set length-k substrings W. The ETFS problem asks us to construct X_{ED} such that: (i) no occurs in X_{ED}; (ii) the order all other Σ is same (iii) has minimal edit distance When represents individual’s data confidential substrings, algorithms solving can applied for utility-preserving sanitization [Bernardini et al., ECML PKDD 2019]. Our first result here algorithm solve (kn²) time, which improves on state art arXiv...

String data are often disseminated to support applications such as location-based service provision or DNA sequence analysis. This dissemination, however, may expose sensitive patterns that model confidential knowledge (e.g., trips mental health clinics from a string representing user’s location history). In this article, we consider the problem of sanitizing by concealing occurrences patterns, while maintaining utility, in two settings relevant many common processing tasks. first setting,...