bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nanoscale Imaging of Interstitial‐Dependent Optical Confinement through Near‐Field Scanning Optical Microscopy
Authors: Kamal Hossain Mohammad 
Published: May 2022

AbstractExploitation of optical confinement in nanoscale unveils a wealth of information about the structure, optical, electronic, and chemical properties of the materials. However, realizing such confinement by optical microscopy and spectroscopic techniques have remained challenging due to fundamental formulation that is related to the diffraction theory of light. A state‐of‐art technique, known as near‐field scanning optical microscopy (NSOM) has the ability to break such diffraction limitation, as the spatial resolution depends on the near‐field probe diameter and the distance between the probe and the surface. A home‐built apertured NSOM (a‐NSOM) developed in the beginning of NSOM discovery facilitated to investigate N‐particles nano‐assemblies, where N is two or more. Through surface‐sensitive spectroscopy such as surface‐enhanced Raman scattering (SERS) and surface‐enhanced two‐photon‐induced photoluminescence (TPI‐PL), a correlated optometrology was revealed by taking snapshots of shear‐force topography, SERS and TPI‐PL simultaneously in single‐channel and multi‐channel detection system. Here in this “Personal Account” we have decorated near‐field optical confinement observed by a‐NSOM in three constructs; archetype dimer, nano‐assembly of few nanoparticles and long‐range two‐dimensional (2D) nano‐assembly. In the case of dimer, optical confinement was localized and interstitial‐dependent whereas coalescence of nearby confinements was reported in few particles nanoaggregate. In the case of 2D nano‐assembly, optical confinements were more complex because a nanoparticle was surrounded by six or more adjacent nanoparticles. FDTD simulation were carried out to support and validate the experimental observations. Such observations in nanoscale taking snapshots of nanometric topography and surface‐sensitive spectroscopic signal not only inspire us to understand optical confinements in near‐field, but also implement the concept in designing miniaturized and efficient system.
Numerical method for steady ideal 2‐D flows of finite vorticity with applications to vertical‐axis wind turbine aerodynamics
Authors: Nikiforov Ilia , Rahman Ziaur 
Published: May 2022

AbstractThis paper presents a new method for approximately modeling 2‐D ideal steady fluid flows with finite vorticity induced by actuator curves of arbitrary shape. An actuator curve is an infinitesimally thin region containing a body force density acting on the flow, while the rest of the flow is force‐free. The approach can be used for any flow satisfying this description, but, like other actuator methods, it is naturally suited for modeling turbines or propellers. We derive a weak formulation of the governing equations in the Lagrange streamfunction
and solve it using finite elements. Compared to related methods such as the actuator cylinder (AC) approach, our formulation is uniquely suited for computations involving wake–wake or wake–turbine interactions. We validate the method by computing the flow through a single Darrieus vertical‐axis wind turbine (VAWT) and comparing with previous work. To demonstrate the ability to simulate interacting actuators of arbitrary configuration, we simulate a three‐VAWT array. The turbines are modeled in a freestream, and the loading is chosen to represent ideal airfoils. The standard VAWT results are consistent with previous work, validating the method. The three‐VAWT array demonstrates a higher efficiency than the single VAWT (0.56 vs. 0.52), with differing optmal tip speed ratios for the upwind and downwind turbines (upwind: 3.9, downwind: 3.1. The optimum for a single turbine is 3.6). The flow field of the three‐VAWT array shows expected features such as an acceleration of flow between the two counter‐rotating upwind turbines.
Embracing Well-Being in Diverse Contexts: The Third Wave of Positive Psychology and African Imprint
Authors: Wissing Marié P. , Schutte Lusilda , Liversage Christelle 
Published: May 2022

AbstractFor a long time, well-being research had been driven from a Western perspective with a neglect of cultural and contextual variables. In this chapter we argue with reference to well-being research as manifested in positive psychology (PP) as a discipline, that contextual, metatheoretical and metadisciplinary perspectives need to be taken into account. Developments in PP over time are described, illustrating the importance of contexts and assumptions in understanding well-being, and how new assumptions in the third wave of PP resonate with old African wisdoms about interconnectedness as a core value in human lives. The first wave of PP focused on advocating for the positive in human functioning, many facets of well-being were differentiated in theory and empirical studies, while assuming a naturalist worldview and that findings from the West are globally applicable. The second wave showed that PP needs to take context, culture and negative facets of human life into account for understanding the nature and dynamics of well-being. The emerging third wave of PP is characterized by the acceptance of a strong relational ontology and trends towards contextualization, interconnectedness and post-disciplinarity. Harmonizing Western and African perspectives are indicated, and specifically also the understanding of well-being as harmony and harmonization. The third wave suggests a move to “well-being studies”, instead of the disciplinary bound “positive psychology studies”—a butterfly leaving its cocoon.
Increasing Perceived Weight and Resistance by Applying Vibration to Tendons During Active Arm Movements
Authors: Ushiyama Keigo , Takahashi Akifumi , Kajimoto Hiroyuki 
Published: May 2022

AbstractWe proposed to use kinesthetic illusion to achieve wearable/portable haptic devices for kinesthetic feedback in VR experiences. The kinesthetic illusion is the illusion of limb movement typically induced by vibratory stimulation. We investigated how the kinesthetic illusion affected the perceived weight and resistance of the handheld object. We designed vibration patterns that simulate constant gravity and velocity-related resistance. Two experiments were conducted to measure changes in perceiving weight and resistance when wielding cylindrical weights and hand fans. The results of the experiments indicated that the designed kinesthetic illusions enhanced these sensations; the real weight was perceived heavier, and the real resistance was perceived larger. However, we could not find the explicit difference between the two stimulation patterns, and the resistance sensation induced by the illusion differed from the actual sensation of using the hand fans.
Experiencing Touch by Technology
Authors: Weda Judith , Kolesnyk Dasha , Mader Angelika , van Erp Jan 
Published: May 2022

AbstractTouch technology can mediate social touch in situations when people cannot be physically close. Recent social touch technologies use haptic actuators capable of displaying pressure touch. We studied experience in two set-ups which use such actuators: a motorized ribbon and a McKibben sleeve. We investigated whether there is an inherent emotional and sensory experience attached to sensations produced by those set-ups. Participants were presented with pressure touches varying in rate of force change, peak force and contact area. Participants rated the sensory and emotional experience of each stimulus variation with a check-all-that-apply measure of 79 items in two sections and the Emojigrid. We found that force has a major effect on the experience of a passive pressure touch. Speed and width also played a role, but to a lesser extent and only in one of the set-ups. The results inform the design of mediated social touch applications in making the technology more congruent with the context.
Effect of Focus Direction and Agency on Tactile Perceptibility
Authors: Zook Zane A. , O’Malley Marcia K. 
Published: May 2022

AbstractPrior research has shown that the direction of a user’s focus affects the perception of tactile cues. Additionally, user agency over touch stimulation has been shown to affect tactile perception. With the development of more complicated haptic and multi-sensory devices, simple tactile cues are rarely used in isolation and the effect of focus direction and of user agency on the perception of a sequence of tactile cues is unknown. In this study, we investigate the effect of both of these variables, focus direction and agency, on the perception of a cue sequence. We found that the direction of user focus and user sense of agency over tactile stimulation both had a significant effect on the accurate perception of a cue sequence. These results are presented in consideration for developing better haptic devices that account for users’ focus on and control over these devices.
Sound Pressure Field Reconstruction for Ultrasound Phased Array by Linear Synthesis Scheme Optimization
Authors: Chen Jianyu , Suzuki Shun , Morisaki Tao , Toide Yutaro , Fujiwara Masahiro , Makino Yasutoshi , Shinoda Hiroyuki 
Published: May 2022

AbstractUltrasound phased array is a device that is usually used to provide mid air tactile sensations like three-dimensional shape haptics images by generating various specific sound fields. Forming foci for the ultrasound phased array using the linear synthesis scheme (LSS) is a straightforward technique to induce tactile feeling. The matching phase set for each focal point is calculated separately in LSS, and then they are linearly superimposed to generate multiple focal points. Due to the fact that adding an arbitrary offset to the entire phase pattern has no effect on the generated focus patterns, adjusting the offset in linear summation may result in a superior sound field. In our study, we propose that optimize the offset before linear superposition. These offsets are determined based on the number of focal points, which means it will not cause an explosive increase in computing cost with the increase of transducers. To optimize the offset of each focus pressure generated by LSS, we used a greedy algorithm with a brute-force search optimization method. The computing cost of our proposed method is dictated by the number of foci after calculating the phase sets of LSS once. We demonstrate the proposed method’s optimum performance in varied numbers of foci and transducers in this study.
Expanding Dynamic Range of Electrical Stimulation Using Anesthetic Cream
Authors: Hamazaki Takumi , Saito Taiga , Kaneko Seitaro , Kajimoto Hiroyuki 
Published: May 2022

AbstractElectrical stimulation is one of the methods to stimulate skin sensation, and can provide sensations such as vibration and pressure by changing the polarity of the stimulus. These stimuli can be combined to design a variety of tactile sensations. However, there is a major problem with electrical stimulation: As the amount of electric current is increased, itching or pain sensation is elicited. This study aims to suppress the itching and pain caused by electrical stimulation, and to present strong, clear, and stable, pressure and vibration sensations. We applied an anesthetic cream containing lidocaine, which is one of the most used local anesthetics, to reduce the induced pain and itching. Therefore, we specifically examine the applicability of lidocaine toward a desirable situation, in which pain thresholds are increased and tactile thresholds are not significantly affected. The results showed a significant relationship between the application of the cream and the dynamic range of stimulating current, and subsequently the quality of experience by human participants.
Estimation of Frictional Force Using the Thermal Images of Target Surface During Stroking
Authors: Shimomura Mitsuhiko , Fujiwara Masahiro , Makino Yasutoshi , Shinoda Hiroyuki 
Published: May 2022

AbstractWe propose a method for estimating the frictional force between a contacted surface and the human touch using thermal video images captured using an infrared thermographic camera. Because this method can estimate force remotely, its application to various situations, in which the measurement is difficult to obtain using conventional contact-based methods, is expected. Furthermore, thermal images have the advantage of measuring physical quantities directly related to frictional force. As a result of machine learning using the measured data from multiple subjects and materials, we succeeded in estimating the frictional force with a high accuracy from the information of the temperature change on the surface. In addition, we account for both the frictional and direct heat transferred between the finger and object affecting the temperature change; therefore, we attempted to improve the accuracy by extracting only frictional heat. Consequently, our method succeeded in improving the accuracy.
Spatial Resolution of Mesoscopic Shapes Presented by Airborne Ultrasound
Authors: Somei Zen , Morisaki Tao , Toide Yutaro , Fujiwara Masahiro , Makino Yasutoshi , Shinoda Hiroyuki 
Published: May 2022

AbstractThis study determined the spatial resolution of the virtual surface profile created by ultrasound haptic stimulation. We assumed the case where a finger moves along the surface of a virtual object. This object was produced by low-frequency lateral modulation that creates a pseudo static force. We defined the spatial resolution as the minimum distance required to discriminate between two virtual bumps. Several sensory channels are combined when a human feels the geometric features of a surface. This paper focuses on mesoscopic shapes, whose representative length ranges from a few millimeters to fingertip size. We considered two strategies to present mesoscopic shapes: changing either the contact position or the force strength. We measured the spatial resolutions in mesoscopic shapes created by each method, and discussed which factor is more effective to perceive mesoscopic features.
Vibrotactile Similarity Perception in Crowdsourced and Lab Studies
Authors: Abou Chahine Ramzi , Kwon Dongjae , Lim Chungman , Park Gunhyuk , Seifi Hasti 
Published: May 2022

AbstractCrowdsourcing can enable rapid data collection for haptics research, yet little is known about its validity in comparison to controlled lab experiments. Furthermore, no data exists on how different smartphone platforms impact the crowdsourcing results. To answer these questions, we conducted four vibrotactile (VT) similarity perception studies on iOS and Android smartphones in the lab and through Amazon Mechanical Turk (MTurk). Participants rated the pairwise similarities of 14 rhythmic VT patterns on their smartphones or a lab device. The similarity ratings from the lab and MTurk experiments suggested a very strong correlation for iOS devices ($$r_s= 0.9$$rs=0.9) and a lower but still strong correlation for Android phones ($$r_s= 0.68$$rs=0.68). In addition, we found a stronger correlation between the crowdsourced iOS and Android ratings ($$r_s=0.78$$rs=0.78) compared to the correlation between the iOS and Android data in the lab ($$r_s= 0.65$$rs=0.65). We provide further insights into these correlations using the perceptual spaces obtained from the four datasets. Our results provide preliminary evidence for the validity of crowdsourced VT similarity studies, especially on iOS devices.
Influence of Prior Visual Information on Exploratory Movement Direction in Texture Perception
Authors: Jeschke Michaela , Zöller Aaron C. , Drewing Knut 
Published: May 2022

AbstractWhen humans explore objects haptically, they seem to use prior as well as sensory information to adapt their exploratory behavior [1]. For texture discrimination, it was shown that participants adapted the direction of their exploratory movement to be orthogonal to the orientation of textures with a defined direction [2]. That is, they adapted the exploratory direction based on the sensory information gathered over the course of an exploration, and this behavior improved their perceptual precision. In the present study we examined if prior visual information that indicates a texture orientation produces a similar adjustment of exploratory movement direction. We expected an increase of orthogonal initial exploration movements with higher qualities of prior information. In each trial, participants explored two grating textures with equal amplitude, only differing in their spatial period. They had to report the stimulus with the higher spatial frequency. Grating stimuli were given in six different orientations relative to the observer. Prior visual information on grating orientation was given in five different qualities: 50% (excellent information), 35%, 25%, 15% and 0% (no information). We analyzed movement directions of the first, middle and last strokes over the textures of each trial. The results show an increase in the amount of initial orthogonal strokes and a decrease in variability of movement directions with higher qualities of prior visual information.
Pilot Study on Presenting Pulling Sensation by Electro-Tactile Stimulation
Authors: Nakayama Shota , Manabe Mitsuki , Ushiyama Keigo , Miyakami Masahiro , Takahashi Akifumi , Kajimoto Hiroyuki 
Published: May 2022

AbstractWhen an object that is grasped with a finger is pulled by an external force, the traction force is perceived by cutaneous receptors and proprioception in the finger. Several attempts have been made to simulate the pulling sensation by using wearable devices, including mechanical asymmetric vibration and tightening by belt. In this study, we developed a new method that uses electrical simulation to generate an illusory force sensation by simulating the activity pattern of the cutaneous receptors. We validated our method through two experiments, one based on force direction judgment and the other on force magnitude adjustment.
Literature Review
Authors: Georgiades Stavros 
Published: May 2022

AbstractCoordinating creative group work remains a major organizational challenge, especially in teams with specialists representing distinct knowledge domains. The author defines coordination as the process through which people arrange actions in ways that they believe will enable them to accomplish their goals. An increase of complex tasks, specialization and interdependencies among specialists make the question of how coordination occurs in teams of diverse experts particularly relevant to the study of organizations.
Findings
Authors: Georgiades Stavros 
Published: May 2022

AbstractThe shooting of a film involves coordination of crew members within emerging sub-teams. The author will first describe the scene shooting process, including the rehearsal process taking place just before the actual shooting, highlighting the way crew members coordinate through formal structures. The author will next discuss how a creative team subsequently turns into uncoordinated methods—in the form of informal practices—and more specifically the way an initial sub-team is formed and then develops into a revised sub-team with a different member formation and new roles and responsibilities for existing members, in order to manage job interdependencies and emerging issues, explaining how the dynamic interplay between formal coordination structures and informal coordination practices evolves and the team developmental process unfolds, before finally describing how the revised sub-team dismantles in order for the same process to develop during the shooting of the scenes to follow, emphasizing a cyclical team coordination process.
The hidden side of scalar-triplet models with spontaneous CP violation
Authors: Ferreira P. M. , Gonçalves B. L. , Joaquim F. R. 
Published: May 2022

Abstract
Scalar triplet extensions of the Standard Model provide an interesting playground for the explanation of neutrino mass suppression through the type-II seesaw mechanism. Propelled by the possible connections with leptonic CP violation, we explore under which conditions spontaneous CP violation can arise in models with extra scalar triplets. The minimal model satisfying such conditions requires adding two such triplets to the SM field content. For this model, the scalar mass spectrum in both the CP-conserving and spontaneous CP-violating scenarios is studied. In the former case, a decoupling limit for the new scalars can be achieved, while this is not the case when CP is spontaneously broken. In particular, we show that the existence of two light neutral scalars with masses below a few tenths of GeVs is unavoidable in the CP-violating case. Using matrix theory theorems, we derive upper bounds for the masses of those light scalars and briefly examine whether they can still be experimentally viable. Other interesting features of the scalar mass spectrum are discussed as, e.g., the existence of relations among the charged and neutral scalar masses.
Four-point functions with multi-cycle fields in symmetric orbifolds and the D1-D5 CFT
Authors: Lima Andre Alves , Sotkov G. M. , Stanishkov M. 
Published: May 2022

Abstract
We study SN-invariant four-point functions with two generic multi-cycle fields and two twist-2 fields, at the free orbifold point of the D1-D5 CFT. We derive the explicit factorization of these functions following from the action of the symmetric group on the composite multi-cycle fields. Apart from non-trivial symmetry factors that we compute, the function with multi-cycle operators is reduced to a sum of connected correlators in which the composite fields have, at most, two cycles. The correlators with two double-cycle and two single-cycle fields give the leading order contribution in the large-N limit. We derive explicit formulas for these functions, encompassing a large class of choices for the single- and the double-cycle fields, including generic Ramond ground states, NS chiral fields and the marginal deformation operator. We are thus able to extract important dynamical information from the short-distance OPEs: conformal dimensions, R-charges and structure constants of families of BPS and non-BPS fields present in the corresponding light-light and heavy-light channels. We also discuss properties of generic multi-cycle Q-point functions in MN/SN orbifolds, using a technology due to Pakman, Rastelli and Razamat.
The $$ \mathcal{N} $$ = 2 supersymmetric w1+∞ symmetry in the two-dimensional SYK models
Authors: Ahn Changhyun 
Published: May 2022

Abstract
We identify the rank (qsyk + 1) of the interaction of the two-dimensional $$ \mathcal{N} $$
N
= (2, 2) SYK model with the deformation parameter λ in the Bergshoeff, de Wit and Vasiliev (in 1991)’s linear W∞[λ] algebra via $$ \lambda =\frac{1}{2\left({q}_{\mathrm{syk}}+1\right)} $$
λ
=

1

2

q
syk

+
1

by using a matrix generalization. At the vanishing λ (or the infinity limit of qsyk), the $$ \mathcal{N} $$
N
= 2 supersymmetric linear $$ {W}_{\infty}^{N,N} $$

W
∞

N
,
N

[λ = 0] algebra contains the matrix version of known $$ \mathcal{N} $$
N
= 2 W∞ algebra, as a subalgebra, by realizing that the N-chiral multiplets and the N-Fermi multiplets in the above SYK models play the role of the same number of βγ and bc ghost systems in the linear $$ {W}_{\infty}^{N,N} $$

W
∞

N
,
N

[λ = 0] algebra. For the nonzero λ, we determine the complete $$ \mathcal{N} $$
N
= 2 supersymmetric linear $$ {W}_{\infty}^{N,N} $$

W
∞

N
,
N

[λ] algebra where the structure constants are given by the linear combinations of two different generalized hypergeometric functions having the λ dependence. The weight-1,$$ \frac{1}{2} $$

1
2

currents occur in the right hand sides of this algebra and their structure constants have the λ factors. We also describe the λ = $$ \frac{1}{4} $$

1
4

(or qsyk = 1) case in the truncated subalgebras by calculating the vanishing structure constants.