bluuebunny/crossref_metadata_2025 huggingface dataset:
Stories from Cancer Camp: Tales of Glitter and Gratitude
Authors: Laing Catherine M. , Moules Nancy J.
Published: July 2024

Each year in Canada, approximately 1400 children and adolescents under the age of 20 are diagnosed with cancer.Â  It is well recognized that childhood cancer affects the entire family, and innumerable challenges accompany this diagnosis. In recognition of the challenges that accompany this disease, cancer camps started in the 1970s to help children and their families escape the rigidity and severity of cancer treatment. Very little is known about how camps affect these families, and to that end, a philosophical hermeneutic study was conducted to understand the meaning of childrenâ€™s cancer camps for the child with cancer and the family. Â Six families were interviewed to bring understanding to this topic, and while the research included findings related to the concept of play, fit and acceptance, grief, and community, this paper will detail the finding related to storytelling and the reshaping of experiences that happens by virtue of being at camp.Â
Some Introductory Words For Two Little Earth Cousins
Authors: Jardine David W
Published: July 2024

This article is an introduction to the subsequent one by Jodi Latremouille's "My Treasured Relation." It demonstrates that hermeneutic work is always about the application of particular cases to universals, demanding of universals to listen to the difference that the case portends.
Conducting Hermeneutic Research: The Address of the Topic
Authors: Moules Nancy J , Field Jim C. , McCaffrey Graham P. , Laing Catherine M.
Published: July 2024

The conduct of research as guided by philosophical tenets of hermeneutics, in particular the hermeneutics of Hans-Georg Gadamer, is a complex and sophisticated endeavor. In this paper, we offer that one of the things that guides the inquiry is the topic and that most often topics for discovery arrive with the experience of an address. We discuss the notion of the address of the topic, how a researcher discerns a topic to be studied and, from this address, develops appropriate research questions that help to inform how the study will be conducted.
The Process of Speech-acting Specifies Methods for Grasping Meaning. Ten Operations. A Contribution to Hermeneutics
Authors: Gran Thorvald
Published: July 2024

How does speech-acting theory explain thegeneration of meaning and meaningful collective action? What place does firstperson subjective experience have in the theory? What are some of themethodological implications of the theory?Â The purpose here is to outline the Searlean theory of meaning formationand to draw some directions for research into meaning formation andorganization from that outline. Searle assumes a deep intentionality, adirectedness towards the world of all the human capacities. Searle asks: how dohumans from external inputs from the world and through language produceknowledge of the world and organized projects that implemented change theworld. Reasoning implies meaning. Reasons to act identify conditions of success= a meaningful act. Research directions (10) are drawn from elements of the speech act theory: the locutionary process, status assignments and meanings,willfulness, types of speech acts, decision-making and organization.
A Hermeneutics of Practice: Philosophical Hermeneutics and the Epistemology of Participation
Authors: Davey J.R. Nicholas
Published: July 2024

Gadamerâ€™s â€œPhilosophical Hermeneuticsâ€ leaves several unresolved questions inviting further development. (1) If scientific methodology is no longer the counter-balance to questions of procedure in the humanities, what can hermeneutics offer the sciences in grappling with the absence of certainty? (2) Why does Gadamer not develop the notion that understanding is a type of movement? What is understandingâ€™s seemingly perpetual disquiet? (3) Gadamerâ€™s case that understanding is an event is part of his rejection of the Kantian thesis that â€œknowingâ€ is grounded in subjective consciousness. The question of how such events are generated is unresolved. Placing the event of understanding in a linguistic horizon establishes its ontological pre-requisite but offers no insight into the mechanisms that have to be in place to facilitate its emergence. This paper will suggest that the notion of practice (itself a philosophical theme not extensively discussed in Gadamer) offers three possible answers to these questions. (1) Practice evolves notions of certitude other than those that are strictly epistemological. (2) Practice is often driven by a quest for completion (Vollzug) which proves instrumentally disruptive and a means to new insight. The drive for completion is a candidate for generating understandingâ€™s disquiet. (3) Practice facilitates not so much a fusion but a collision of horizons capable of generating unexpected transformations of understanding. All three answers suggest the development of philosophical hermeneutics into what will be termed a participatory hermeneutics. Â
Encountering the Great Problems in the Street: Enacting Hermeneutic Philosophy as Research in Practice Disciplines
Authors: McCaffrey Graham , Moules Nancy J
Published: July 2024

In this paper, we speak to tenets of Gadamerian hermeneutic philosophy that “guide” our hermeneutic inquiry in research that seeks to understand the complexity of human experiences. In our conduct of hermeneutic research, we grapple with “great problems” and encounter the human difficulty of topics such as childhood cancer, grief, mental illness, education and schools, arts and humanities, and other topics that show up in practice professions of nursing, teaching, social work, or psychology.
The Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. Part One: A Strange and Earnest Client
Authors: Williamson W. John
Published: July 2024

Max Hunter, a West Coast private detective, receives a call from John Williamson, a special education teacher / coordinator requesting his help to find the educational category of slow learners. He journeys to Calgary and visits Williamson in his school. After some discussion Max agrees to take the case. Max meets an informant with a surprising connection to the case, and finds some key clues, as well as peril, during a visit to the public library.
The Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. Part Two: Cells of Categorical Confinement
Authors: Williamson W. John
Published: July 2024

This follows the events described in Part One of this narrative. Max Hunter, a West Coast private detective, still conducting an investigation to find the educational category of slow learners at the behest of his client John Williamson, meets his client to discuss the next steps in the investigation. Max engages in some incognito detective work in educational settings and then encounters an injurious interruption to his casework. He then resumes his work, now as a wounded operative, by investigating the history of disability categorization with the help of two prominent critical theorists.
Invited Guest Editorial: Just Saying: For H/heaven’s Sake… Here’s Hoping --- “All Hell Could Break Loose!”
Authors: Paul Jim
Published: July 2024

If you have been reading, to date, in the Journal of Applied Hermeneutics, Dr. John Williamson’s PhD thesis-come-novel serialized, then you have read, more or less, four texts: Guest Editorial: Preface to “A Strange and Earnest Client” Part One of the Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery by W. John Williamson [January 11, 2016];The Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. Part One: A Strange and Earnest Client [January 11, 2016];Invited Guest Editorial. Lives Worthy of Life: The Everyday Resistance of Disabled People by Nick Hodge [February 22, 2016], andThe Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. Part Two: Cells of Categorical Confinement [February 22, 2016].           My name is Jim Paul. I am the Invited Guest Editorial provider for the third installment of John’s work titled - Part Three: All Hell Could Break Loose.
The Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. Part Four: Quaint Notions of Justice
Authors: Williamson W. John
Published: July 2024

These chapters follow the events described in Parts One to Three of this narrative. Max Hunter, a private detective, is still on the trail of “slow learners,” a category of students his client, educator John Williamson, claims are continually getting “lost” in Alberta’s school system. Max encounters philosophers, fellow educators, and even students labeled as slow learners, all of whom have suggestions for finding these students in ways that attend to them as learners while resisting the rigidity of their labelling. He also encounters an agent of a sinister operation who works to ensure that slow learners stay lost, and who intends to make Max disappear too.
Invited Guest Editorial: Quaint Memories of Puzzling Through Mysteries
Authors: Field James Colin
Published: July 2024

The incompleteness of meaning and the finitude of understanding suggest that the subject matters (die Sache) of understanding are mysteries rather than problems. Mysteries are not subject to the methodological solutions problems are. A problem denotes a difficulty demanding a solution. Mysteries however can only be understood more deeply. They are not to be explained away but are to be discerned as an ever-present limit to our understanding. They invoke an apprehension of a radical limitlessness (Davey, 2006, p. 29).I had the good fortune of supervising John’s thesis—a mysterious venture to be sure, because when we started, neither the path nor the destination were clear. In this editiorial I preface John's latest installment of his serialization of The Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. Part Four: Quaint Notions of Justice.
Editorial: Following Good Leads
Authors: Moules Nancy J
Published: July 2024

This is the fifth and final editorial to accompany the last installment of John Williamson's The Case of the Disappearing/Appearing Slow Learner: An Interpretive Mystery. In this editorial, I talk about the intention of publishing Williamson's work in this way as a unique example of applied hermeneutic research. I also discuss what the work teaches us in hermeneutic research: the importance of following good leads.
Synergistic Research in Medical Education: Some Philosophical Reflections
Authors: Hovey Richard B , Rodríguez Charo , Jordan Steven , Morck Angela
Published: July 2024

In this paper, we present and discuss the “synergistic research approach,” from quantitative and qualitative through mixed methods, as a term that refers to an academic endeavour in which researchers are not only committed to comprehensiveness and rigor, but also – and importantly – to excellence in peer processes that further enhance knowledge generation by emphasizing the philosophical underpinnings thereof. We outline the hermeneutic wager, which provides the philosophical grounds for synergistic research, and explain the reasons why we consider this perspective to be of particular interest in the health profession education field of inquiry.
Secrets in the Open: An Exercise in Interpretive Writing
Authors: Blackman Galicia Solon
Published: July 2024

In this paper I present an exemplar of interpretive writing based on my engagement with the movie, My Life as a Dog. The film is a series of vignettes about Ingemar, a young boy, who is processing the events which arise from the difficulties wrought by his mother’s illness. This is not the typical coming of age film where the child becomes an adult through the initiation into life’s painful circumstances. The film ends with the character still in his boyhood. Nevertheless, the intermittent voice-over conveys the impression that Ingemar is narrating in retrospect, in a build up to his emergence from a state of innocence to awareness, and acceptance of pain and loss. I attended to the principles of hermeneutic practice outlined by several scholars to frame my understanding of what it means to enter the hermeneutic circle to explore the topic which addressed me: Secrecy.
The Symbolism of Evil in the Big Book of AA
Authors: Latvanen Kari
Published: July 2024

Alcoholics Anonymous (AA) describes itself as a “fellowship of men and women who share their experience, strength and hope with each other that they may solve their common problem and help others to recover from alcoholism” (Alcoholics Anonymous, 2010). The fellowship has millions of members all around the world and the number of independent AA groups is counted in tens of thousands. In this article, I try to understand the recovery from alcoholism in the fellowship of AA as a meaning giving process where the alcoholic is invited to interpret the founding text of AA, Alcoholics Anonymous: The Story of How More Than One Hundred Men Have Recovered from Alcoholism, and to appropriate the world that it opens in front of him. I focus on interpreting the symbolic language with which the Big Book of AA speaks of evil. I also explain how this symbolic language is related to recovery – i.e., how the alcoholic may find in the pages of the Big Book commonly shared symbols of stain, sin, and guilt which express his blind experience of evil.
Invited Guest Editorial: Nursing as Interpretation
Authors: McCaffrey Graham
Published: July 2024

In this editorial, the context of a graduate class on hermeneutic research is described. Two papers were selected from the class that represent one of the course assignments that requires students to write a written response to the statement: "Nursing is an interpretive practice." The papers that correspond to this editorial are discussed and an interpretation of the master's students' efforts to take up the statement brings us back to the intent of the course.
Knowing People and Interpretive Practice
Authors: Turcato Whitney C , McCaffrey Graham , Moules Nancy J
Published: July 2024

This paper is my response to the statement “All nursing is interpretive.” Using an exemplar from my experience as an outreach nurse with the homeless population, I provide my perspective on how nursing is not only interpretive, but how interpretation is an integral component of nursing practice across practice settings. It is demonstrated that interpretation not only helps us to know people, but can also help us navigate our settings and at times keep us safe. It is written in the first person from the perspective of the first author.
Effect Of Wavy Structure Of Liquid Film On Flow Characteristics Of Impingement Jet Flowing On Fuel Liquid Film
Authors: Zama Yoshio , Eriguchi Hiroyasu , Furuhata Tomohiko
Published: July 2024

In recent years, diesel engines have been downsized in order to improve combustion efficiency by using high-pressure injection to atomize the fuel and to increase fuel economy. As a result, the diesel spray flame inevitably impinges on the combustion chamber wall, resulting in heat loss due to heat transfer between the flame and the wall. According to Newton's cooling law, the heat transferred from the flame to the wall is proportional to the heat transfer coefficient, which is closely related to the flow of the spray flame. However, there are few reports on the flow of a spray flame impinging on a wall. The flow characteristics of a non-vaporized spray impinging on a wall surface, assuming that the flow of a spray flame impinging on a wall surface is equivalent to that of a non-vaporized spray. The fuel film formed on the wall affected on the flow characteristics of the spray. When the spray flame impinges on the wall in the engine cylinder, no liquid film is formed on the wall. Still, during cold start, a liquid fuel film may form on the piston wall due to the low temperature in the engine cylinder, resulting in HC and soot emissions. As a result, the spray may flow over the formed film. Therefore, it is necessary to investigate the flow characteristics of the spray flowing over the fuel film. In this study, the experiments using an impingement gas jet were conducted on a wall surface with a fuel film, and the velocity field of the jet after impingement of the wall surface was measured by the time-series PIV. In addition, the thickness of the wavy liquid film formed by the gas jet impingement was measured by using the laser-induced fluorescence (LIF) method, discussing the relationship between the velocity of the jet after wall impingement and the characteristics of the wavy liquid film.
Linear Photodiode Arrays For Time-Domain FLEET Velocimetry In Hypersonic Flows
Authors: Carter Douglas W. , Beresh Steven J.
Published: July 2024

Linear photodiode arrays are applied to Femtosecond Laser Electronic Excitation Tagging (FLEET) to determine the stream-wise velocity of flow at Mach 8 in the Sandia Hypersonic Wind Tunnel (HWT). Incident light emitted by nitrogen gas upon FLEET excitation is collected by intensifying optics that amplify and transmit the light to the photodiode elements as the gas advects downstream. Two photodiode array configurations are considered: one aligned with the flow direction and one that is perpendicular to it. Conventional FLEET using a CMOS image sensor is also performed for quantitative comparison. The configurations are tested for purely free-stream cases as well as the wake of a seven-degree half-angle cone model at various Reynolds number. The influence of the bi-exponential decay of the FLEET line and the transfer function imposed by the intensifying optics are identified as key considerations on the time-domain method accuracy. Overcoming these effects leads to promising application spaces due to the compact nature of photodiodes and low data overhead.
Reconstruction Of Time-Averaged 3D Pressure Fields In The Wake Of An Ahmed Body With Pressure From PIV
Authors: Ladwig Marc , Gericke Timo , Huettig Steffen , Lindken Ralph
Published: July 2024

In this contribution, we present and compare time-averaged pressure fields reconstructed from scanned stereoscopic 2D3C-PIV data and volumetric 3D-PTV data (Shake-The-Box) with classic pointwise surface pressure tap measurements. Measurements were conducted in the near-wake region of an one-quarter scaled Ahmed body (Ahmed 1984) with 25° slant angle at height-based Reynolds numbers of Re = 5.06 · 10^4 and 1.13 · 10^5, respectively, i.e. free-stream velocities of 10.5 m/s and 23.5 m/s. The measurements are a continuation of previous measurements (Gericke et al. 2023, Ladwig et al. 2023) with a focus on the more complex flow topology concerning the wake flow structure. Measurements were conducted in a low-speed wind tunnel of Göttinger design with a semi-closed test section at Bochum University of Applied Sciences. The investigated flow field in the near wake region is dominantly characterized by a strongly three-dimensional flow field based on a mutually influenced vortex system in the wake, which challenges the utilized pressure reconstruction algorithm based on the Reynolds-averaged Navier-Stokes equations. The present study addresses challenges in pressure reconstruction due to the presence of highly transient rotational and shearing flow in the context of a practical application. The results show good agreement between reconstructed PIV/PTV-based pressure fields and reference pressure measurements using classic wall pressure measurements. The global characteristics of the pressure distributions are correctly reproduced. The agreement is particularly good in areas of unidirectional flow and local smaller velocity gradients. In shear zones as well as separation and, e.g., recirculation areas, larger deviations are clearly visible, as the velocity gradients present near the surface are not sufficiently captured at all.
Simultaneous Two-Colour Two-Dye Thermometry PLIF And PIV To Determine The Nusselt Number In Steady And Oscillatory Poiseuille-Rayleigh-Bénard Convection
Authors: Kashanj Sina , Nobes David
Published: July 2024

In a flow field driven by natural or mixed convection, the measurement of heat transfer and hence the Nusselt number, requires simultaneous measurement of the vertical component of velocity and the vertical temperature gradient. The spatiotemporal nature of the formation of large-scale circulating structures, their interaction with the cross flow and its impact on heat transport, temperature distribution and wall shear stress also can be identified by simultaneous velocimetry and thermometry. An optical measurement system has been developed to apply a high sensetive ((~7 %)⁄℃) two-colour two-dye planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) to identify the flow and temperature organization and measure the heat transfer and wall shear stress. The system is to be used to investigate a Poiseuille-Rayleigh-Bénard convection system designed and fabricated to operate in both continuous and oscillatory conditions. The aim is to allow investigation of the influence and effect of large-scale flow structures and thermal plumes on heat and flow transport properties.
Aerosol Structure Measured By Double Field Of View Digital Sideband Holography
Authors: Torres Ana María López , Salazar Julia Lobera Salazar , Gimeno Nieves Andrés , Seruendo Eva María Roche , Milla Francisco José torcal , Díaz Virginia Palero
Published: July 2024

Digital sideband in-line holography is a technique, based in classical digital in-line holography, that allows the measurement of the position and velocity of the particles in a three dimensional fluid flow. The great advantage of this technique is its very simple set-up, which basically requires a camera, a lens and a frequency filter to record the holograms. The sideband configuration removes the twin image and prevents the recording of unwanted frequencies that causes aliasing, therefore increasing the Signal-to-Noise Ratio. In this work it has been applied for the quantitative characterization of a three-dimensional aerosol, where droplet velocity and position have been measured. The field of view that can be recorded with magnification M≈1 has been doubled by illuminating two volumes with the same beam that crosses the aerosol twice before reaching the camera sensor. These two fluid volumes are analyzed independently while keeping a high spatial resolution in the axial component.
SLIPI Polarization Ratio Combined With Light Transmission Imaging To Deduce Droplet Sizing And Liquid Volume Fraction In Optically Dense Sprays
Authors: Stiti Mehdi , Garcia Sebastien , Alfred J , Berrocal Edouard
Published: July 2024

This paper addresses challenges in spray diagnostics, focusing on scenarios with high optical depths. Traditional laserbased techniques for droplet size measurements face issues related to light scattering and absorption. SLIPI polarization ratio method is used there in order to characterize the droplet diameter without the addition of dyes. The potential of the method for measurement of the Sauter Mean Diameter as well as the surface mean diameter is investigated using Phase Doppler measurement. The combinations of SLIPI polarization method and SLIPI transmission measurement in 3D allows for an estimation of the liquid volume fraction.
Cross-Plane PIV For The Characterization Of Low Viscosity Viscoelastic Fluids
Authors: Weiss Lukas , Rüppel B , Weiss Tatiana , Wensing Michael
Published: July 2024

"Thermal management of electric high-power devices is more important than ever. The electrification of the transport sector and increasing High-Performance-Computing (HPC) are the main driving forces for the increasing demands. Therefore, immersion cooling concepts arise, where the cooling liquid is in direct contact with the heat source, e.g., the CPU of a computer or the cell of a battery module. The main advantage is to eliminate the heat conduction through a cooling plate or heat pipes in the heat transfer path, which increases cooling efficiency. The downside is that the cooling system could get very bulky, which is not very critical in huge HPC centers but is a showstopper for mobile applications. The project IBAT investigates radically new dielectric cooling fluids, funded by the EU program Horizon 2020. These oil-based synthetic liquids are of very low viscosity. This allows very small gaps between battery cells, resulting in a compact battery module design. Naturally appearing vortices at the cell edges quickly dissolve due to the low-viscosity liquids. A stable boundary layer forms on the cell surface, diminishing the heat transfer. To counteract this phenomenon, linear vortex generators (LVGs) could be applied to the cell surface. The downside of this solution is increased flow resistance and, thus, higher pumping losses in the cooling circuit, partly canceling out the advantages of the low-viscosity liquids. The more sophisticated solution to the breakup of the thermal boundary layer is to stabilize the natural vortices. This is achieved by adding long polymer chains to the fluids, which give them viscoelastic properties. The initial results are very promising but show that the fluid properties must be tailored to the specific geometry. The catch is that the viscoelastic fluid properties of such low-viscosity fluids cannot be measured with conventional rheometers. A workaround is provided by optical flow analytics in benchmark geometries. One method is the observation of cross-plane vortices in a 180° bend with a circular cross-section. The authors describe and discuss the challenges and uncertainties of cross-plane PIV for such experiments.
"
Splashing Morphology And Crown Dynamics Of Single Droplets Impinging Heated Liquid Films
Authors: Vasconcelos Daniel , Silva André , Barata Jorge
Published: July 2024

The phenomena of droplet impact can be encountered in modern applications, including heat exchangers, electronic cooling devices, and internal combustion engines. The underlying mechanisms of two-phase flows, coupled with heat and mass transfer processes, such as evaporation, condensation, and boiling, increase the complexity of physical systems. This requires a thorough investigation of interfacial dynamics associated with temperature gradients and mass transfer phenomena. However, existing studies in the literature mainly focus on droplets impacting liquid films under ambient conditions, neglecting thermal effects. Therefore, the main objective of this work is to evaluate the influence of the liquid film temperature on the droplet impact outcomes, namely splashing and crown dynamics. An experimental facility was designed and adapted to account for both ambient and non-isothermal conditions. The droplet is released from a hypodermic needle until impacting onto the liquid film. The impact surface is positioned above an aluminum block, which acts as a heat source, heating the liquid film by conduction. Water, n-decane, and n-heptane are the fluids considered for the experiments. Study cases include varying the droplet impact velocity and liquid film temperature, encompassing both spreading and splashing regimes for isothermal and non-isothermal conditions. Experimental results show that an increase in the liquid film temperature induces the transition from spreading to splashing regimes across all fluids. Qualitatively, this translates from smooth to irregular crowns due to the formation of cusps in the crown rim. These structures are the main source of secondary atomization, which is promoted by increasing the liquid film temperature. Transitional regimes may display several irregularities, in which splashing is visualized at non-isothermal conditions, followed by the reduction/suppression of the splashing occurrence for higher liquid film temperatures. These require further attention in order to fully comprehend fluid and heat flow, such as Marangoni stresses and local evaporation.
Experimental Investigation Of Open Channel Flow Around A Hemisphere At Different Relative Depths Using 3D-PTV
Authors: Nilsson Dan , Andersson Anders , Larsson Sofia , Andersson Robin , Billstein Mats , Lillberg Eric
Published: July 2024

In regulated rivers and small streams, the presence of large roughness elements like boulders and concrete structures significantly impacts the local flow field and creates complex hydraulic conditions important for aquatic habitats. This study focuses on investigating and analyzing the complex three-dimensional flow field around an idealized stone (represented as a hemisphere) to understand how the flow field changes for different relative depths i.e. water depth relative to boulder height, and flow rates. Time-resolved 3D Particle Tracking Velocimetry was employed in laboratory experiments conducted in an open-channel flume, to mimic varying river conditions and their impact on flow characteristics. Results reveal that the relative depth significantly influences the flow structure behind the hemisphere, impacting recirculation zones and wake characteristics. The flow field behind the hemisphere was found to be more sensitive to changes in relative depth than bulk velocity. The study also highlights the larger regions of lower streamwise velocity that occurred downstream of the hemisphere caused by the lower submergences combined with a higher magnitude of the downward vertical velocity. Furthermore, this study demonstrates the capability of the measurement technique and the time-resolved 3D Particle Tracking Velocimetry system used to effectively capture the complex flow dynamics around the boulder. This approach allowed for detailed visualization and quantification of flow parameters such as streamwise and vertical velocities within the wake region, which are important factors for aquatic habitats. Understanding the underlying flow dynamics around an idealized stone at low relative depths could yield insights into ecohydraulic engineering and ecological restoration in shallow streams. This can contribute to advancing our understanding of riverine flow dynamics and their ecological implications.
Pressure And Noise Estimation Of Tandem Cylinder Flow Based On PIV
Authors: Chen Langsheng , Ye Qingqing
Published: July 2024

The present work proposes an optimized method for pressure reconstruction and far-field noise prediction for tandem cylinder flow based on time-resolved planar particle image velocimetry (PIV). Proper orthogonal decomposition (POD) low-order reconstruction is applied to mitigate the incoherent noise introduced during PIV measurement and processing and enhances the identification of dynamic characteristics of relative structures within the flow field. As a result, PIV-based pressure reconstruction through solving the Poisson equation encompasses fewer errors arising from contaminated boundary conditions and Poisson source terms, thereby mitigating the propagation of errors into pressure. The time-marching algorithm accelerates the convergence and stabilizes the iterative progress while solving the Poisson equation, leading a considerable computation savings for cases with multiple snapshots like aeroacoustics relative investigation. The reconstructed wall pressure is compared with the reference pressure fluctuation signal simultaneously measured, yielding good agreement. Finally, the far-field noise was predicted through Curle’s analogy based on reconstructed wall pressure, considering the spanwise correction derived through an additional spanwise planar PIV. The predicted far-field noise agrees well with the reference microphone measurement. The overall assessment demonstrates that the employment of POD low-order reconstruction and time-marching algorithm significantly improve the speed and accuracy for estimating pressure field and far-field noise.
Resolving Flow Structures Inside Three Dimensional Packed Beds With Gas Flow By Ray Tracing Particle Image Velocimetry
Authors: Velten Christin , Ebert Mirko , Lessig Christian , Zähringer Katharina
Published: July 2024

Two different configurations are investigated in this study by ray tracing Particle Image Velocimetry to access the interior of different spherical packing structures. Configuration 1 consists of a regular bidisperse packed bed of 10mm and 40mm spheres based on a body-centered cubic arrangement. Ray tracing Particle Image Velocimetry was performed behind two spheres in the 40mm layer for particle Reynolds numbers from 200 to 700. The averaged velocity flow fields show the jet structures according to the pores between the underlying smaller spheres and the influence of the large spheres. Since ray-tracing Particle Image Velocimetry suffers from experimental and numerical limitations, planar 2D Particle Image Velocimetry measurements are performed to obtain spatially highly resolved validation data in the optically accessible void pores. These measurements were performed at different height positions in the bed showcasing that similar flow fields appear in the different pores. Configuration 2 deals with the jet flow (Re=5900) around an individual sphere, part of a body-centred cubic arrangement of d=40mm spheres. The emphasis lays on the temporally resolved snapshot data of the turbulent jet flow obtained by ray tracing Particle Image velocimetry. Data obtained from both configurations is used for a comprehensive discussion of the chances and challenges of ray tracing Particle Image Velocimetry. Limitations appear on the experimental side, like generation of depth of field, illumination and reflections, sufficient measurement signal, and accuracy of the geometry, but also on the numerical side, like the reproduction of the geometry, material properties, and real-world conditions. Since all these phenomena are interlinked, performing the ray tracing method in more complex systems is questionable.
One-Shot Omnidirectional Pressure Integration Through Matrix Inversion
Authors: Zigunov Fernando , Charonko John
Published: July 2024

In this work, we present a method to perform 2D and 3D omnidirectional pressure integration from velocity measurements with a single-iteration matrix inversion approach. This work builds upon our previous work, where the rotating parallel ray approach was extended to the limit of infinite rays by taking continuous projection integrals of the ray paths and recasting the problem as an iterative matrix inversion problem. This iterative matrix equation is now ``fast-forwarded'' to the ``infinity'' iteration, leading to a different matrix equation that can be solved in a single iteration, thereby presenting the same computational complexity as the Poisson equation. We observe computational speedups of $\sim10^6$ when compared to brute-force omnidirectional integration methods, enabling the treatment of grids of $\sim 10^9$ points and potentially even larger in a desktop setup at the time of publication. Further examination of the boundary conditions of our one-shot method shows that omnidirectional pressure integration implements a new type of boundary condition, which treats the boundary points as interior points to the extent that information is available.
Spatial And Temporal Modes On A Generic Tandem Configuration In Transonic Shock Buffet
Authors: Schauerte Christopher Julian , Schreyer Anne-Marie
Published: July 2024

Certain combinations of upstream flow conditions in transonic flight may incite a highly unsteady shock-wave/boundary-layer interaction, often referred to as transonic buffet. The coupling of periodic shock motion and intermittent separation is seen to convey a characteristic unsteadiness in the evolution of the turbulent wake. This article uses high-speed focusing Schlieren and PIV measurements at high spatial resolution to characterize the temporal and spectral modes governing the flow past a generic 2D tandem configuration. This interaction, consisting of an OAT15A supercritical airfoil as the main wing and a NACA 64A-110 profile representing the tailplane, is investigated at chord-based Reynolds numbers of 2 million and 1 million, respectively and compared against fully-established shock buffet conditions in an isolated airfoil scenario operated at identical inflow conditions. The strongest buffet is observed in both configurations for a Mach number of 0.72 and an angle of attack of 5 deg, occurring at frequencies of 112 Hz and 103 Hz. Despite an equally periodic nature of the buffet unsteadiness, both shock amplitude and frequency are seen to decrease slightly in the tandem interaction. Global spectral analysis performed on the entire field of view identifies the buffet instability as the governing mode in both flow scenarios, imposing its unsteadiness even far downstream of its origin, allowing the extraction. of relevant sensor locations for a subsequent localized assessment of the involved time scales. Except for the buffet mode, complementing DMD analyses reveal a strong influence of a vortex-shedding mode throughout the entire buffet cycle. Mode shapes and associated frequencies furthermore suggest an intermittent low-frequency/large wavelength and high-frequency/low wavelength behavior, involving leading contributions between 2000 Hz and 4000 Hz.
Point Spread Function And Spatial Resolution Analysis Of Multi-Focus Plenoptic Cameras
Authors: Schleuniger Pierre , Brunel Marc , Blaisot Jean-Bernard
Published: July 2024

With the recent development of plenoptic cameras, light field imaging has become a reliable solution for 3D metrology. Plenoptic cameras allow recovering the 3D information of a scene with a single acquisition and only one camera. These advantages make light field imaging particularly interesting for the metrology of two-phase flows. The measurement depth of a back-light imaging setup can be determined by the calibration of the Point Spread function (PSF) of the optical system. This study provides a method adapted to multi-focus plenoptic cameras to measure the PSF width from reconstructed images. We used a calibration target composed of multiple calibrated opaque disks and a diffuse backlight illumination set-up. The PSF width is estimated by measuring the grayscale gradient at the interface of the images of the disks. Coupled with the depth information provided by the plenoptic camera, we obtained the evolution of the PSF at different depth planes. The information on the PSF enables us to obtain the focus criterion, which sets the limits of the measurement volume. The spatial resolution of the reconstructed images is obtained from the PSF. The results obtained for the resolution as a function of virtual depth are consistent with results from previous studies.
Visualization Of Freestream Vortices In The NASA Langley 4-Foot Supersonic Unitary Plan Wind Tunnel
Authors: Burns Ross A. , Fahringer Timothy W. , Danehy Paul M.
Published: July 2024

Streamwise vortices present in the freestream of the NASA Langley 4-Foot Supersonic Unitary Plan Wind Tunnel have been observed experimentally for the first time. A high-energy, burst-mode laser system was used to conduct time-resolved planar laser Mie scattering in the freestream of this facility. The freestream of the facility was observed over Mach numbers ranging from 2.4 to 4.6 and (unit) Reynolds number between 3.3 × 106 to 14.8 × 106 1/m. Apparent vortical structures were observed in the tunnel freestream at Mach numbers ≤ 3, with little difference observed for varying the Reynolds number. With further increasing Mach number, protrusive and oscillatory vertical ‘sprite’ structures were observed emanating from the tunnel floor boundary layer. Neither of these structural phenomena has been observed before experimentally in the facility and acts to confirm and inform predictions made in computational fluid dynamic simulations of the facility.
THE INFLUENCE OF CSR DISCLOSURE, ENVIRONMENTAL PERFORMANCE, AND INTERNAL CORPORATE GOVERNANCE ON THE ACHIEVEMENT OF SUSTAINABLE DEVELOPMENT GOALS
Authors: Farda Agustin Aulia , Saraswati Erwin
Published: July 2024

Sustainable Development Goals (SDGs) require the involvement of various roles to support their achievement, especially from the business world. The research is aimed at examining the influence of CSR disclosure, environmental performance and Internal Corporate Governance on achieving the SDGs. The sample selected was 99 basic industrial and chemical companies listed on the Indonesia Stock Exchange (BEI) in the 2018-2022 period using the purposive sampling method. Data analysis uses unbalanced panel data regression analysis with the Eviews 12 application. The results of this research show that CSR disclosure in quantity and quality, environmental performance, and CEO non-duality, which are indicators of Internal Corporate Governance, have a significant effect on achieving the SDGs. On the other hand, other indicators of Internal Corporate Governance, namely board independence and board presence and the control variables of this research, namely size and leverage, do not have a significant effect on achieving the SDGs. Even though there is an influence between CSR disclosure, environmental performance and Internal Corporate Governance on the achievement of the SDGs, there are several factors that cause the influence of Internal Corporate Governance to not be maximized
Transcription factor 7 like 2 gene polymorphism and advanced glycation end products as risk factors for diabetic nephropathy
Authors: Abdel Razzak Ghadeer ,   Department of Clinical Pathology, Faculty of Medicine, Assiut University, Assiut, Egypt.
Published: July 2024

Diabetic nephropathy (DN) is the most serious and prevalent complication, being a major contributing factor to end-stage renal disease, that can lead to death in diabetic patients. The main pathologic changes of DN are the accumulation of advanced glycation end products and growth factors. Genetic variations may have an impact on the initiation and development of DN. Transcription factor 7 like 2 (TCF7L2) gene may contribute to the etiology of DN in combination with other genes. We aimed to determine whether the genotype distribution of single nucleotide polymorphism rs7903146 of TCF7L2 gene and level of advanced glycation end products (AGEs) could be risk factors for DN. The study included 54 diabetic patients, classified as 36 diabetic patients with nephropathy and 18 diabetic patients without nephropathy. The frequency of genotypes of SNP rs7903146 of TCF7L2 gene in diabetic patients without nephropathy was CC: 50%, CT: 33.3% and TT: 16.7%, while in diabetic patients with nephropathy was CC: 16.7%, CT: 69.4% and TT: 13.9%. In diabetic patients with nephropathy, risk allele carrier genotypes (CT+TT) represented 83.3% compared to 50% in diabetic patients without nephropathy. The frequency of allele distributions of SNP rs7903146 C/T of TCF7L2 gene in diabetic patients without nephropathy was C allele: 66.7% and T allele: 33.3%, while in diabetic patients with nephropathy was C allele: 51.4% and T allele: 48.6%. The T allele of SNP rs7903146 C/T of TCF7L2 gene was predominant in diabetic patients with nephropathy. Also, AGEs were significantly elevated in diabetic patients with nephropathy. In conclusion, the T allele of SNP rs7903146 C/T of TCF7L2 gene and risk allele carrier genotypes (CT+TT) were associated with the susceptibility to development of nephropathy in type 2 diabetes mellitus patients. AGEs could be a good biomarker in monitoring progression of DN disease.
Association of IL-13 rs20541, FOXP3 rs3761548 genes polymorphisms and serum level of IL-13 with allergic asthma in Egyptian patients
Authors: Fahmy Yasmin ,   Department of Microbiology & Immunology, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
Published: July 2024

The interleukin 13 (IL-13) gene single nucleotide polymorphisms (SNPs) are frequently linked to increased vulnerability to allergic asthma. Forkhead box protein P3 (FOXP3) is an important molecule in the formation of regulatory T cells (Treg). The genetic variants that alter FOXP3 function may have a role in the development of asthma and other allergic disorders. We aimed to determine the association of IL-13 rs20541, FOXP3 rs3761548 genes SNPs and serum levels of IL-13 with allergic asthma patients. In this case–control study, 41 Egyptian patients with allergic asthma were included. Age and gender matched. 41 normal volunteers were considered the controls. All subjects were examined for IL-13 rs20541 and FOXP3 rs3761548 SNPs by the polymerase chain reaction /restriction fragment length polymorphism technique. The serum level of IL-13 was assessed by the enzyme linked immunosorbent assay (ELISA). AA genotype at IL-13 rs20541 SNP was statistically significantly different between the studied groups (p= 0.042). Also, a statistically significant difference was detected when compared AA genotype to GG genotype as AA genotype was three times at risk for asthma (p1=0.031) (OR=3.95) and A allele increased the risk of asthma by about 3 times (OR=3.2). AA genotype at FOXP3 rs3761548 SNP was statistically significantly different between the studied groups (p=0.013). Also, a statistically significant difference was detected when compared AA genotype to CC genotype as AA genotype was 7 times at risk for asthma (p1=0.003) (OR=7.04) and A allele increased the risk of asthma by about 3 times (p<0.001) (OR=3.07). The serum level of IL-13 was statistically significant different between both groups (p<0.001). We can conclude that IL-13 could be a useful tool for predicting allergic asthma. Patients with AA genotype of IL-13 rs20541 and AA genotype of FOXP3 rs3761548 have a higher risk for developing allergic asthma.
Helicobacter pylori present in caries sample among dental caries patients
Authors: Ahmad Zainab ,   Department of Microbiology, College of Dentistry, University of Babylon, Hilla, Iraq.
Published: July 2024

Helicobacter pylori is Gram negative bacteria, the reason for causing peptic ulcer. There is suggestion between the presence of H. pylori in oral cavity and gastritis. The present study aimed to detect H. pylori in dental caries samples. The study included 29 dental caries patients from both sexes (13 males and 16 females), with different age groups (children and adult), and nine apparently healthy subject as a control group (2 males & 7 females). Dental caries samples were collected and investigated for this study from patients with dental caries who visited the Dental Faculty in the College of Dentistry, University of Babylon, Iraq. H. pylori antigen was detected using an enzyme linked immunosorbent assay (ELISA) technique. Of the 29 dental caries patients, 19 (65.51%) patients were positive for H. pylori antigen test. Most of them were in the age group 20-30 (9 patients) & 30-40 (8 patients). The age groups (10-20) & (40-50) years shows 100% positivity for H. pylori antigen. Also, result was recorded significant higher difference's between H. pylori positive antigen between dental caries patients and H. pylori positive antigen among control group. (t=2.697,df=5, p≤ 0.05). Pearson correlation recorded significantly higher association between the presence of H. pylori antigen and the dental caries infection among test group (r=1, p≤ 0.000), 4 (44.5%) of the 9 control subjects, without dental caries, were positive for H. pylori antigen test. In summary, the H. pylori positive antigen test was recorded in both dental caries patients (65.51%) and in the control group (62.5 %). In conclusion, H. pylori antigen was present in dental caries patients. This could indicate that the bacteria H. pylori present in dental caries samples may contribute to caries processes.