Instrumental Function Research Articles

RESTORATION OF THE LINGUISTIC TRADITION OF ETHNIC LIVS: ASPECTS OF MOTIVATION

Livs are one of the Baltic Finnish ethnic groups; their historical location is in the north-western part of Kurzeme and Vidzeme Regions in Latvia. According to the 2011 census in Latvia, 250 individuals defined themselves as Livs. This marks a significant rise in their population, compared to 48 individuals in the 1970s. Linguistically, Livs are Finno-Ugrians, thus differing from Latvians who represent the Indo-European speaking family. Ethnological data of the 19th and 20th century provide evidence that Livs have been predominantly bi-lingual, gradually leaving their own language in the second place and therefore natural inheritance of the language diminished as a result, until it was broken, supposedly in 2013. Nowadays we can observe a strong tendency to restore Liv culture and linguistic tradition. The present-day statistics indicate about 200 speakers of the Liv language. Field research shows that members of the Liv community recog- nise the increase of prestige and popularity of their language, nevertheless the main language experts today are researchers and those interested in ethnic identity matters. This might serve as evidence that the language tradition is revived rather than naturally inherited within the Liv community. What is the motivation to restore the language tradition in the 21st century, if the instrumental linguistic function of ethnic minorities has become clearly marginalised and only symbolic aspects have remained topical? This issue will be examined in the paper.

High-fidelity inference of local impurity profiles in C-2W using Bayesian tomography.

In C-2W (also called "Norman") [1], beam-driven field reversed configuration plasmas embedded in a magnetic mirror are produced and sustained in a steady state. A multi-chord passive Doppler spectroscopy diagnostic provides line-integrated impurity emission measurements near the center plane of the confinement vessel with fast time resolution. The high degree of plasma non-uniformity across optical sightlines can preclude direct fitting of the measured line-integrated spectra. To overcome this challenge, local impurity profiles are inferred using Bayesian tomography, a superior analysis technique based on a complete forward model of the diagnostic. The measured emission of O4+ triplet lines near 278.4nm is modeled assuming two independent populations: thermal and beam ions. Gaussian processes are used to generate and infer local profiles. The inference incorporates details of the geometrical arrangement of the diagnostic, instrument function, intensity calibration, and a noise model. Markov chain Monte Carlo (MCMC) sampling of the posterior distribution of solutions provides high-fidelity uncertainty estimates. The reconstructed O4+ impurity profiles are consistent with data from other diagnostics and show good agreement with expected physics based on previously developed models of biasing circuit and impurity transport.

Construction and Application of Waterway Engineering Design Virtual Simulation Cloud System Based on Outcome-Based Education

Hydraulic design is automatically inherent in hydraulic engineering courses, conventional teaching of the Waterway Engineering Design course tends to have limitations such as low participation, poor interactivity, disconnection between theoretical and experimental training, and restriction of experimental design by time and space. To address these needs, a virtual simulation cloud system of Waterway Engineering Design is developed based on outcome-based education. Taking real engineering projects as prototypes, this system adopts virtual reality technology and cloud platform to simulate the scene structure and instrument function with high precision. The multi-model, integrational teaching expands the experimental content, enhances the interactivity of the design process, and provides a high-quality, immersive online learning experience for students. Since its application, the Waterway Engineering Design Virtual Simulation Cloud System has received good feedback from both teachers and students. During the Covid-19 epidemic, it provided significant support for experiments and teaching of the Waterway Engineering Design course and became a pivotal supplement to the existing teaching system. The Waterway Engineering Design Virtual Simulation Cloud System adheres to the "student-centered" teaching principle, builds up students' ability for independent learning and engineering practice, and facilitates their personal development and training for excellent engineers.

Modeling and suppressing the wavefront degeneration in a CGH interferometric null test.

The computer-generated hologram (CGH) enables the ultra-high accuracy of surface measurement but causes the wavefront degeneration in the optical system. In this article, we give a high-accuracy analytical simulation of the wavefront degeneration in null test by the elliptical Gaussian model. We propose an analytical expression of instrumental transfer function (ITF) for the CGH null test without knowing the phase distribution of CGH, which gives an efficient instruction to suppress the wavefront degeneration. The ITF of the interferometric null test for a ∅3m aspheric mirror can be optimized from 0 to 0.65 at 0.4 Nyquist frequency.

Synchrotron Mössbauer source: trade-off between intensity and linewidth.

A synchrotron Mössbauer source (SMS) enables conventional (energy-domain) Mössbauer spectroscopy at synchrotron radiation facilities. In comparison with radioactive sources, SMS provides a beam of several micrometres in size, permitting studies of extremely small samples. The SMS linewidth can be narrowed at the expense of its intensity by varying the angular position and temperature of the key element of the SMS - an iron borate 57FeBO3 crystal. Here, in order to optimize the SMS performance, the angular and temperature dependencies of the SMS parameters have been studied and the optimal angular position and temperature of the crystal have been determined for highest intensity at specified source width. The results show that, when accepting broadening of the source width up to ∼6 natural widths, the intensity of the SMS at the European Synchrotron reaches more than 105 γ-quanta s-1. In the opposite extreme, the width of the source approaches the natural width with intensity decreasing toabout 103 γ-quanta s-1. These changes of intensity up to two orders of magnitude take place over a temperature range of about 0.5°C. For all temperature and angular conditions, the instrumental function of the source was derived; we also analyzed the modification of its shape when passing from the `low-width' to `high-intensity' extremes of SMS operation. Finally, we estimated the influence of the temperature instability and mosaicity of the iron borate crystal on the SMS performance.

Quasi-analytical resolution-correction of elastic neutron scattering from proteins.

Elastic neutron scattering from proteins reflects the motional amplitudes resulting from their internal collective and single-atom dynamics and is observable if the global diffusion of whole molecules is either blocked or cannot be resolved by the spectrometer under consideration. Due to finite instrumental resolution, the measured elastic scattering amplitude always contains contaminations from quasielastic neutron scattering and some model must be assumed to extract the resolution-corrected counterpart from corresponding experimental spectra. Here, we derive a quasi-analytical method for that purpose, assuming that the intermediate scattering function relaxes with a "stretched" Mittag-Leffler function, Eα(-(t/τ)α) (0 < α < 1), toward the elastic amplitude and that the instrumental resolution function has Gaussian form. The corresponding function can be integrated into a fitting procedure and allows for eliminating the elastic intensity as a fit parameter. We illustrate the method for the analysis of two proteins in solution, the intrinsically disordered Myelin Basic Protein, confirming recently published results [Hassani et al., J. Chem. Phys. 156, 025102 (2022)], and the well-folded globular protein myoglobin. We also briefly discuss the consequences of our findings for the extraction of mean square position fluctuations from elastic scans.

Redundant apodization for direct imaging of exoplanets

Context. Telescope pupil fragmentation from spiders generates specific aberrations that have been observed at various telescopes and are expected on the 30-meter class telescopes under construction. This is known as the island effect, and it induces differential pistons, tips, and tilts on the pupil petals, deforming the instrumental point spread function (PSF); it is one of the main limitations to the direct detection of exoplanets with high-contrast imaging. These petal-level aberrations can have different origins such as the low-wind effect or petaling errors in the adaptive optics reconstruction. Aims. In this paper, we propose a method for alleviating the impact of the aberrations induced by island effects on high-contrast imaging by adapting the coronagraph design in order to increase its robustness to petal-level aberrations. Methods. Following a method first developed and applied on robustness to errors due to primary mirror segmentation (e.g., segment phasing errors, missing segments), we developed and tested redundant apodized pupils (RAP): apodizers designed at the petal-scale, then duplicated and rotated to mimic the pupil petal geometry. Results. We applied this concept to the ELT architecture, made of six identical petals, to yield a 10−6 contrast in a dark region from 8 to 40λ/D. Both amplitude and phase apodizers proposed in this paper are robust to differential pistons between petals, with minimal degradation to their coronagraphic PSFs and contrast levels. In addition, they are also more robust to petal-level tip-tilt errors than classical apodizers designed for the whole pupil, with which the limit of contrast of 10−6 in the coronagraph dark zone is achieved for constraints up to 2 rad RMS of these petal-level modes. Conclusions. In this paper the RAP concept proves its robustness to island effects (low-wind effect and post-adaptive optics petaling), with an application to the ELT architecture. It can also be considered for other 8- to 30-m class ground-based units such as VLT/SPHERE, Subaru/SCExAO, GMT/GMagAO-X, and TMT/PSI.

Development of a differential photoacoustic system for the determination of the effective water diffusion and water vapor permeability coefficients in thin films

This paper focused on developing a methodology and metrology using a differential photoacoustic (PA) system to determine the effective water vapor diffusion coefficient (Deff) and the effective permeability coefficient (Π) in thin films as a piece of paper and standard polystyrene for a controlled relative humidity. The methodology proposes a new differential photoacoustic system, including the water reservoir, relative humidity, and temperature detectors. Two cells, reference/sample, were used to obtain the instrumental function to reduce the electronic and environmental noises. A method based on the study of ln[1−(S−S0)/ΔS]=t/τD and the behaviors of R2 as a function of the number of data was proposed to assess the region in which the photoacoustic signal should be processed to determine each effective coefficient. S is the amplitude of the PA signal, S0 is the initial amplitude value, ΔS is the change, t (time), and τD is the water vapor diffusion time. The effective water diffusion coefficient (Deff) for water and polystyrene was 1.90 × 10−11 m2/s and 3.09 × 10−11 m2/s, respectively. The permeability coefficient value for the piece of paper was 4.18 × 10−9 mol kg−1 cm−2 s−1 Pa−1, while for polystyrene, it was 6.80 × 10−9 mol kg−1 cm−2 s−1 Pa−1 for 70% of relative humidity. This methodology can be extended by changing the moisture content on the chamber to obtain the dependence of Deff as a function of relative humidity.

Method for Calculating the Instrument Function of a Medical Hyperspectrometer

Hyperspectral imaging technology offers great opportunities in noninvasive disease diagnostics and scientific research. Medical hyperspectrometer operation is based on the light ability to be reflected from biological tissue and depends on how strongly the tissue absorbs/reflects the light. Knowledge of the reflected and scattered light from tissues makes it possible to accurately interpret the state of health of a patient. Hyperspectrometer was considered consisting of projection lens that takes a picture of the patient's body from the finite distance, imaging spectrometer, as well as of calibrated radiation sources to illuminate the areas under study. Image decomposition into spectrum was implemented in the scheme of a classical spectrometer, which entrance slit was the exposure slit of the imaging lens. To ensure scanning, it was supposed to use displacement either of the spectrometer or of the patients under examination on a conveyor belt. A technique is proposed for determining the instrument function of a medical hyperspectrometer taking into account the scattering function influence of optical system, slit, optical radiation receiver, image displacement relative to the slit and electronics. By analyzing the instrument function, it becomes possible to implement various methods for assessing the optical image quality, such as modulation transfer function and spatial and spectral resolution, which is required for correct use of the device and image interpretation. The instrument design process involves optimization of the main circuit and design solutions according to the criterion of their influence on the instrument function and the generated image quality. An example of instrument design was considered involving optimization of the basic circuitry and design solutions

The Body of the Other: Hegel on the Relational Structure of Corporeality

What role does the body play in the subject’s formation and in interpersonal exchanges? Does the body merely perform an instrumental function, or can it claim to be a subject of freedom? Thinking of the body within the framework of intersubjectivity requires reassessing the bulk of the philosophical Western tradition. Form the first-person’s perspective endorsed by this tradition, the exteriority of the body has been reduced to a weakness of human nature. Starting from Hegel’s account of the soul-body relation, as presented in the Anthropology, as well as some interpretations of “Lordship and Bondage” on the role of the body in self-doubling (Butler, Malabou, McDowell, Stekeler-Weithofer), I argue that embodiment is a process of (inter)subjectivation. Thematizing the predicative structure of corporeality, Hegel turns the constitutive exteriority of the human body into a potentiality of openness. Hence, Hegel’s dialectic of immediacy and mediation leads to thinking of the body’s universality in opposition to a monadic conception of subjectivity.

Linguistic representation of psychotypes in the artistic discourse of W. Golding

The article is devoted to the study of specific lexical representations of psychotypes in the framework of a work of art. The relevance of this article is that linguists are concerned with studies in the field of functional linguistics and psycholinguistics, in which language is considered within the framework of an instrumental function. The aim of the work is to identify specific tokens that reflect the psychotypes of the characters. The material for the study is the lexemes from Lord of the Flies by William Golding. The meanings of selected language units convey the personal touch of Ralphs and Jacks nature. The study used contextual description and structural and semantic approach. The article describes their behavior and speech from the perspective of psychology and psycholinguistics. Ralph is a hypertim and Jack is an epileptoid. The contrast of the boys behavior indicates that the hypertim and epileptoid are not able to find a common language in the distribution of social roles. The characteristics of the psychotypes have an impact on the management of the group. Ralph manages the group in the following ways: relying on humanism, mutual understanding; he jokes to defuse the situation; he encourages the guys to save them from the outside, and tries to awaken the humaneness in the guys. Jack uses the following means of controlling the group: authoritarianism, mental intimidation, physical violence. Authoritarianism is expressed through the use of the imperative. Mental intimidation is achieved by using lexemes that reflect physical influences, insults. In addition, mental bullying occurs through body language (piercing gaze, looking down). In conclusion, the author comes to the following conclusion: psychotypes are transmitted mainly through lexemes that reflect body language; hypertim is reflected through language units with positive or neutral connotations, while epileptoid is expressed through language units with negative and neutral connotations.

Time-of-flight mass spectrometer for diagnostics of continuous plasma flow.

This paper describes a version of the time-of-flight mass spectrometer based on a modified two-field acceleration approach of Wiley and McLaren. The aim of the device is a diagnostic of continuous plasma flow. The acceleration scheme idea, the construction of the spectrometer, and results of testing in plasma flow of Gd and CeO2 generated by vacuum arc discharge are described. The instrument function of the spectrometer was measured, and its mass resolution was evaluated as ∼20. With the use of the instrument function, how to interpret the registered signal in the case of intersection of mass peaks was suggested. The presented device has a simple construction and relatively low values of applied acceleration voltages, so it has fewer requirements in manufacturability and cost.

The Term “Experience” as a Tool of Inquiry

My purpose here is to take seriously Dewey’s insistence that the term “experience” be considered from a methodological, rather than a substantive, point of view. To consider its methodological import we must examine the purpose it served in his overall account of inquiry. As a technical term, Dewey considered “experience” to serve an instrumental function of control. By this he meant that the term was to serve a purpose in aiding us in the description of concrete situations, as well as drawing attention to our use of language. Dewey eventually gave up on the term because, although it was useful up to a point, it no longer served the methodological functions for which he originally adopted it. Three issues will be considered. I will discuss the implications of Dewey’s instrumental approach for the status we should award our “conceptual apparatus,” or use of language terms; show why traditional philosophical methods, which make a priori assumptions about the nature of reality, were inadequate for the analysis of the actual conditions of living, or the individual case; and, finally, examine how the term “experience,” if its meaning were refashioned and considered as a methodological term, could do so and in that way served as a means of control within inquiry. A consideration of the third issue will help us see why the term, viewed as a tool, proved expendable.

Contents Standard Policy of Basic Education in The National Level Reviewed from The Scope of Citizenship Education Materials

In essence, education in the context of national development has an instrumental role and function, namely as a unifying nation, equalizing opportunities, and developing self-potential. The purpose of this study was to determine the national level policy on the content of national education standards in terms of the scope of Citizenship Education material. This research used library research as the research method. The results of this research indicated that content standards serve as guidelines/references/signs for teachers when providing material in learning activities. Scope of Material for Elementary School/Madrasah Ibtidaiyah/Extraordinary Elementary School/Package A/Other Equal Forms, such as applicable norms and rules, deliberation, characteristics of the family environment, and the importance of maintaining togetherness as capital in upholding unity and integrity and form of attitude and behavior to maintain unity and integrity in the school environment, and the community. Scope of Materials for Junior High Schools/Madrasah Tsanawiyah/Extraordinary Junior High Schools/Package B/Other Equal Forms, such as the chronology of changes to the 1945 Constitution of the Republic of Indonesia as a written basic law, as well as the constitution of the Indonesian state, diagrams of governance linkages the sequence of laws in force in Indonesia, the embodiment of democracy based on the values ​​of Pancasila in the Indonesian government system, the Territory of the Unitary State of the Republic of Indonesia, and the form of state, form of government, and system of government.

High-resolution X-ray Bragg diffraction in Al thermomigrated Si channels

Si(111) wafers patterned with an array of vertical 120 µm-wide Al-doped (1 × 1019 cm−3) p-channels extending through the whole wafer were studied with the X-ray double- and triple-crystal diffraction technique in Bragg geometry with copper radiation. Reciprocal space maps (RSMs) of diffraction intensity far from the channels and near them were measured, and their non-trivial shape was observed. The obtained experimental RSMs demonstrate high sensitivity to the structural distortions of the crystal in the subsurface layer owing to the influence of the surface on the elastic strain field in the channel. These features result from the small difference of the ionic radii of Si and Al, leading to the absence of misfit dislocations on the borders of the channel. Simulations of RSMs using the Takagi–Taupin dynamical diffraction theory taking into account the influence of the surface on the elastic strain field in the channel and the effect of the instrumental function were carried out. Finally, numerical RSM calculations showed that the proposed model of the surface effect on the elastic strain field in a semi-infinite crystal with a vertical Si(Al) channel can be used to retrieve the information on the concentration of aluminium in the thermomigrated Si(Al) channel from the diffraction data obtained in the Bragg geometry.

Distinguishing Gas-Phase and Nanoparticle Contributions to Small-Angle X-ray Scattering in Reacting Aerosol Flows.

We have developed a strategy for distinguishing between small-angle X-ray scattering (SAXS) from gas-phase species and newly formed nanoparticles in mixed gas- and particle-phase reacting flows. This methodology explicitly accounts for temperature-dependent scattering from gases. We measured SAXS in situ in a sooting linear laminar partially premixed co-flow ethylene/air diffusion flame. The scattering signal demonstrates a downward curvature as a function of the momentum transfer (q) at q values of 0.2-0.57 Å-1. The q-dependent curvature is consistent with the Debye equation and the independent-atom model for gas-phase scattering. This behavior can also be modeled using the Guinier approximation and could be characterized as a Guinier knee for gas-phase scattering. The Guinier functional form can be fit to the scattering signal in this q range without a priori knowledge of the gas-phase composition, enabling estimation of the gas-phase contribution to the scattering signal while accounting for changes in the gas-phase composition and temperature. We coupled the SAXS measurements with in situ temperature measurements using coherent anti-Stokes Raman spectroscopy. This approach to characterizing the gas-phase SAXS signal provides a physical basis for distinguishing among the contributions to the scattering signal from the instrument function, flame gases, and nanoparticles. The results are particularly important for the analysis of the SAXS signal in the q range associated with particles in the size range of 1-6 nm.

Improved ozone monitoring by ground-based FTIR spectrometry

Abstract. Accurate observations of atmospheric ozone (O3) are essential to monitor in detail its key role in atmospheric chemistry. The present paper examines the performance of different O3 retrieval strategies from FTIR (Fourier transform infrared) spectrometry by using the 20-year time series of the high-resolution solar spectra acquired from 1999 to 2018 at the subtropical Izaña Observatory (IZO, Spain) within NDACC (Network for the Detection of Atmospheric Composition Change). In particular, the effects of two of the most influential factors have been investigated: the inclusion of a simultaneous atmospheric temperature profile fit and the spectral O3 absorption lines used for the retrievals (the broad spectral region of 1000–1005 cm−1 and single micro-windows between 991 and 1014 cm−1). Additionally, the water vapour (H2O) interference in O3 retrievals has been evaluated, with the aim of providing an improved O3 strategy that minimises its impact and, therefore, could be applied at any NDACC FTIR station under different humidity conditions. The theoretical and experimental quality assessments of the different FTIR O3 products (total column (TC) amounts and volume mixing ratio (VMR) profiles) provide consistent results. Combining a simultaneous temperature retrieval with the optimal selection of single O3 micro-windows results in superior FTIR O3 products, with a precision of better than 0.6 %–0.7 % for O3 TCs as compared to coincident NDACC Brewer observations taken as a reference. However, this improvement can only be achieved provided the FTIR spectrometer is properly characterised and stable over time. For unstable instruments, the temperature fit is found to exhibit a strong negative influence on O3 retrievals due to the increase in the cross-interference between the temperature retrieval and instrumental performance (given by the instrumental line shape function and measurement noise), which leads to a worsening of the precision of FTIR O3 TCs of up to 2 %. This cross-interference becomes especially noticeable beyond the upper troposphere/lower stratosphere, as documented theoretically as well as experimentally by comparing FTIR O3 profiles to those measured using electrochemical concentration cell (ECC) sondes within NDACC. Consequently, it should be taken into account for the reliable monitoring of the O3 vertical distribution, especially over long-term timescales.

Climate Change Adaptation: A Study of Digital Financial Inclusion and Consumption Among Rural Residents in China

Climate change impacts agricultural production negatively. Therefore, rural residents experience large income and consumption fluctuations when dealing with climate change risks. However, little is known about whether digital financial inclusion can help rural residents improve their ability to resist climate change. This study uses the Peking University Digital Financial Inclusion Index of China and China Household Finance Survey data, together with historical temperature data from major cities, to study the impact of digital financial inclusion on Chinese rural residents’ consumption in response to climate change. The results suggest that digital financial inclusion significantly promotes rural households’ total consumption and consumption upgrades. Heterogeneity analyses also show that digital financial inclusion predominantly affects low-income households, low-asset households, and households living in China’s central and western regions. The instrumental variable and control function methods were used for robustness, and our main conclusions are robust and reliable. Although climate change reduces rural residents’ consumption and increases their risks, digital finance inclusion significantly mitigates this negative effect. The government can increase the usage depth of digital financial inclusion in rural areas by promoting the construction of digital financial inclusion facilities. The government should strive to deepen the impact of digital financial inclusion on rural household income and consumption to further improve their ability to resist climate risks.

Laser imaging nephelometer for aircraft deployment

Abstract. Validation of remote sensing retrievals of aerosol microphysical and optical properties requires in situ measurements of the same properties. We present here an improved imaging nephelometer for measuring the directionality and polarization of light (i.e., polarimetry) scattered at two wavelengths (405 and 660 nm) with high temporal resolution. The instrument was designed for airborne deployment and is capable of ground-based measurements as well. The laser imaging nephelometer (LiNeph) uses two orthogonal detectors with wide-angle lenses and linearly polarized light sources to measure both the phase function, P11(θ), and degree of linear polarization, -P12/P11(θ). In this work, we will describe the instrument function and calibration, as well as data acquisition and reduction. The instrument was first deployed aboard the NASA DC-8 during the 2019 FIREX-AQ campaign. Here, we present field measurements of smoke plumes that show that the LiNeph has sufficient resolution for 0.24 Hz polarimetric measurements at two wavelengths, 405 and 660 nm, at integrated scattering coefficients ranging from 50–8000 Mm−1.

Feasibility of performance-based and self-reported outcomes in self-managed falls prevention exercise interventions for independent older adults living in the community

BackgroundLittle is known about associations between performance-based measurements and self-reported scales, nor about ceiling effects or sensitivity to change to evaluate effects in the target population for self-managed exercise interventions. This study aimed to explore the feasibility of using performance-based outcomes for gait speed, functional leg strength and balance, and self-reported outcomes of falls-efficacy and functional ability in two self-managed falls prevention exercise interventions for community dwelling older adults.MethodsIndependent living, community-dwelling older adults (n = 67) exercised with one of two self-managed falls prevention exercise programmes, a digital programme (DP) or a paper booklet (PB) in a 4-month participant preference trial. Pre- and post-assessments, by blinded assessors, included Short Physical Performance Battery (SPPB) and 30s Chair stand test (30s CST). Participants completed self-reported questionnaires: Activities-specific and Balance Confidence scale (ABC), Iconographical Falls Efficacy Scale (Icon-FES), Late-Life Function and Disability Instrument Function Component (LLFDI-FC). In addition, improvement in balance and leg strength was also self-rated at post-assessment. Participants’ mean age was 76 ± 4 years and 72% were women.ResultsCeiling effects were evident for the balance sub-component of the SPPB, and also indicated for ABC and Icon-FES in this high functioning population. In SPPB, gait speed, 30s CST, and LLFDI-FC, 21–56% of participants did not change their scores beyond the Minimal Clinically Important Difference (MCID). At pre-assessment all performance-based tests correlated significantly with the self-reported scales, however, no such significant correlations were seen with change-scores. Improvement of performance-based functional leg strength with substantial effect sizes and significant correlations with self-reported exercise time was shown. There were no differences in outcomes between the exercise programmes except that DP users reported improved change of leg strength to a higher degree than PB users.ConclusionThe LLFDI-FC and sit-to-stand tests were feasible and sensitive to change in this specific population. The balance sub-component of SPPB and self-reported measures ABC and Icon-FES indicated ceiling effects and might not be suitable as outcome measures for use in a high functioning older population. Development and evaluation of new outcome measures are needed for self-managed fall-preventive interventions with high functioning community-dwelling older adults.