bluuebunny/crossref_metadata_2025 huggingface dataset:
Sur le seuil de la perte. Érotisation du risque et précipice mélancolique
Authors: Pelladeau Élise
Published: September 2024

En s’appuyant sur une vignette clinique, cet article s’attèle à décrire la manière dont le chagrin d’amour récapitule le traitement de la perte et la manière dont l’anticipation érotisée de son risque dans le transfert en est une forme possiblement féconde de dépassement. Éprouver ces processus psychiques en thérapie : de l’éprouvé du risque de perte au réel de la perte, à ses réactualisations en entretien, jusqu’à son retournement dans le transfert, a permis à notre patiente de se servir du regard de l’autre comme d’un point de butée, relançant alors les processus identificatoires hystériques, au service d’un deuil éprouvé dans son creux et soutenu dans le transfert.
Earth and Heaven in American Poetry: An Essay in Astrocriticism
Authors: Tabas Brad
Published: September 2024

Cet essai présente l’astrocritique, une théorie critique et une posture herméneutique visant à penser la politique culturelle de la nouvelle ère spatiale. Il se concentre particulièrement sur le thème de la musique céleste dans l’astroculture américaine, proposant des lectures de Thoreau, Lovecraft, Crase et Smith. On comprend mal la culture américaine, voire la culture anthropocène, sans parvenir à reconnaître que l’expérience américaine est alimentée par le pouvoir de l’espace. De la même manière, l’ère du Nouvel Espace reste insaisissable dans sa forme si l’on ne comprend pas le rôle de l’espace dans la culture américaine. Pour penser l’extra-terrestre, il faut s’engager dans une déconstruction critique du globe. Car penser au-delà de l’orbe exige de déterrer et de désincorporer les mots, transformant, comme nous le soutenons ici, le poète en un capteur à distance. Pourtant, aussi exorbitant qu’un tel sacrifice puisse paraître, ce n’est que par de tels moyens que nous pouvons penser notre technosphère et faire résonner les relations de pouvoir extraterritoriales qui dominent la vie sur notre planète depuis Spoutnik.
Les politiques mémorielles et l’histoire. Le boomerang algérien
Authors: Jomier Augustin
Published: September 2024

Cet article a pour objet les politiques mémorielles élaborées en France depuis 2017 concernant la colonisation de l’Algérie (1830-1962) et la guerre d’indépendance algérienne (1954-1962). Argument électoral et outil de clivage partisan, elles se voient aussi assigner le double objectif pacificateur de retisser un lien social supposément fracturé en France par ces mémoires et de contribuer à la relance des relations diplomatiques avec l’Algérie. Cet article propose un premier bilan de cette politique, des logiques qui la sous-tendent, et des acteurs qui la portent.
Comment se dessinent les carrières dans le numérique ? Un regard porté sur trois nouveaux métiers des TIC
Authors: Lutz Axelle , Ceccarelli Agnès , Chouki Mourad
Published: September 2024

Cet article interroge la façon dont se construisent les carrières dans les nouveaux métiers du numérique : chefs de projets, designers et développeurs. Il présente dans un premier temps la littérature dédiée à la notion de carrière marquant la scission entre un cadre d’étude de modèles traditionnels et de nouveaux modèles. Ces derniers, régis par des logiques différentes, impactent les entreprises. Ils constituent donc un réel enjeu organisationnel notamment en termes d’employabilité et de contrats psychologiques. Notre démarche, qualitative, s’appuie sur une enquête conduite auprès de douze professionnels du secteur numérique. L’étude exploratoire met en relief les formations, les expériences, les faits marquants régissant les parcours. Les résultats obtenus permettent de dégager un certain nombre de caractéristiques concordant avec un modèle de carrière nomade et prenant même la forme de trajectoire. Ils illustrent également comment ces parcours peuvent être choisis ou subis et comment un élément clé de ces nouvelles carrières repose sur l’employabilité. Afin d’optimiser cette dernière, les recommandations formulées préconisent une implication conjointe de l’individu et de l’organisation mais également une redéfinition du contrat psychologique. Un futur travail envisagerait la façon dont les organisations conçoivent et opèrent la gestion des carrières dans les nouveaux métiers du digital.
Damaris Masham face aux philosophes
Authors: Hutton Sarah
Published: September 2024

Cet article discute la philosophie de Damaris Masham (née Cudworth) (1658-1708), qui a dialogué avec plusieurs philosophes de son époque dans ses deux livres et ses lettres. Parmi ses interlocuteurs philosophiques figurent non seulement de grands philosophes, canoniques (John Locke, Nicolas Malebranche, Gottfried Wilhelm Leibniz), mais aussi des philosophes considérés aujourd’hui comme « mineurs » (John Norris, et Ralph Cudworth) – ainsi que, plus indirectement, Pierre Bayle et Mary Astell. La plus grande partie de mon analyse portera sur sa discussion avec Locke et Cudworth, mais j’aborde aussi son rapport à Malebranche et Norris. Je retrace son rapport avec Locke et Cudworth afin de clarifier sa position philosophique vis-à-vis de ces interlocuteurs, et d’interroger la valeur d’une histoire de la philosophie dont les paramètres ont été fixés sans prise en compte de la contribution des femmes – dans le cas présent, il s’agit de remettre en cause l’utilité de l’« empirisme » et du « rationalisme » comme catégories classificatoires.
Hommage à Michel Serres
Authors: Baudart Anne
Published: September 2024

Les textes qui rendent ici hommage à Michel Serres (1930-2019) privilégient une singularité et un itinéraire vivants de pensée et d’écriture plus qu’une analyse conceptuelle ou théorique d’aspects de son œuvre.
Chroniques à l’imparfait
Authors: Magnard Pierre
Published: September 2024

Serres, par le chemin des écoliers, au hasard des rencontres, jusqu’à ce que la convergence des occurrences finisse par tracer un parcours. Ni plus habile, ni plus chanceux qu’un autre, seulement plus disponible à l’opportunité et toujours prompt à s’étonner. Le don de l’amitié, c’est de nous faire vivre au risque de l’autre pour nous conduire au sentiment d’être nous-même si inventif que le miracle semble au coin de la rue. Telle fut notre philosophie buissonnière toujours en alerte et toujours exposée à la découverte.
Penser la mobilité sociale par le prisme de l’ambition. Trois portraits de « migrants de classe » en artiste
Authors: Sorignet Pierre-Emmanuel
Published: September 2024

Cet article traite de la dimension positive du parcours de mobilité sociale ascendante de trois danseurs, enquêtés sur la longue durée. Prendre au sérieux leur « ambition », c’est-à-dire une vision d’eux-mêmes à moyen-long terme qui les propulse dans un monde social éloigné de celui dans lequel ils ont évolué dans les premières années de leur vie, c’est comprendre les marges d’action dont ils se sont saisis au fil de leur parcours, mais aussi tenter de sociologiser les affects qu’ils ont dû mobiliser pour faire advenir cette métamorphose sociale. Les ressorts émotionnels du désir de mobilité sociale deviennent ainsi l’objet de l’investigation sociologique. Cela permet d’explorer jusque dans les plis du psychisme les variations des trajectoires d’agents sociaux eux-mêmes inscrits dans des déterminations dans lesquelles ils sont pris et la façon dont ils négocient en permanence leurs pulsions confrontées au probable. C’est alors sur la capacité d’agir et plus spécifiquement lorsqu’elle se déploie dans la pratique professionnelle qu’est focalisé l’article. Dans le cadre du travail de danseur, surmonter le réel de ses déterminations relève en propre d’une forme d’intelligence pratique par corps qui se déploie dans l’action même et dans la capacité d’inventer in situ de nouvelles formes esthétiques, au-delà d’une conceptualisation préalable.
A newfangled isolated entropic measure in probability spaces and its applications to queueing theory
Authors: Singh Vikramjeet , Sharma Sunil Kumar , Parkash Om , Sharma Retneer , Bhardwaj Shivam
Published: September 2024

It is well established that a diverse range of entropic measures, while remarkably adaptable, must inevitably be complemented by innovative approaches to enhance their effectiveness across various domains. These measures play a crucial role in fields like communication and coding theory, driving researchers to develop numerous new information measures that can be applied in a wide array of disciplines. This paper introduces a pioneering isolated entropic measure and its solicitations to queueing theory the study of dissimilarities of uncertainty. By creating the newly developed discrete entropy, we have articulated an optimization principle where the space capacity is predetermined and solitary evidence accessible is around the mean size. Additionally, we have conveyed the solicitations of "maximum entropy principle" to maximize the entropy probability distributions.
On finding a satisfactory partition in an undirected graph: algorithm design and results
Authors: Nofal Samer
Published: September 2024

A satisfactory partition is a partition of undirected-graph vertices such that the partition has only two nonempty parts, and every vertex has at least as many adjacent vertices in its part as it has in the other part. Generally, the problem of determining whether a given undirected graph has a satisfactory partition is known to be NP-complete. In this paper, we show that for a given undirected graph with $ n $ vertices, a satisfactory partition (if any exists) can be computed recursively with a recursion tree of depth of $ \mathcal{O}(\ln n) $ in expectation. Subsequently, we show that a satisfactory partition for those undirected graphs with recursion tree depth meeting the expectation can be computed in time $ \mathcal{O}(n^{3} 2^{\mathcal{O}(\ln n)}) $.
Contractual Chains
Authors: Watson Joel
Published: September 2024

This paper develops a model of private bilateral contracting, in which an exogenous network determines the pairs of players who can communicate and contract with each other. After contracting, the players interact in an underlying game with globally verifiable productive actions and externally enforced transfers. The paper investigates whether such decentralized contracting can internalize externalities that arise due to parties being unable to contract directly with others whose productive actions affect their payoffs. The contract‐formation protocol, called the “contracting institution,” is treated as a design element. The main result is positive: There is a contracting institution that supports efficient equilibria for any underlying game and connected network. A critical property is that the institution allows for sequential contract formation or revision. The equilibrium construction features
assurance contracts and
cancellation penalties.
On the Structure of Informationally Robust Optimal Mechanisms
Authors: Brooks Benjamin , Du Songzi
Published: September 2024

We study the design of optimal mechanisms when the designer is uncertain both about the form of information held by the agents and also about which equilibrium will be played. The
guarantee of a mechanism is its worst performance across all information structures and equilibria. The
potential of an information structure is its best performance across all mechanisms and equilibria. We formulate a pair of linear programs, one of which is a lower bound on the maximum guarantee across all mechanisms, and the other of which is an upper bound on the minimum potential across all information structures. In applications to public expenditure, bilateral trade, and optimal auctions, we use the bounding programs to characterize guarantee‐maximizing mechanisms and potential‐minimizing information structures and show that the max guarantee is equal to the min potential.
Exact Bias Correction for Linear Adjustment of Randomized Controlled Trials
Authors: Chang Haoge , Middleton Joel A. , Aronow P. M.
Published: September 2024

Freedman (2008a,b) showed that the linear regression estimator is biased for the analysis of randomized controlled trials under the randomization model. Under Freedman's assumptions, we derive exact closed‐form bias corrections for the linear regression estimator. We show that the limiting distribution of the bias corrected estimator is identical to the uncorrected estimator. Taken together with results from Lin (2013), our results show that Freedman's theoretical arguments against the use of regression adjustment can be resolved with minor modifications to practice.
Lifestyle Behaviors and Wealth‐Health Gaps in Germany
Authors: Mahler Lukas , Yum Minchul
Published: September 2024

We document significant gaps in wealth across health status over the life cycle in Germany—a country with a universal healthcare system and negligible out‐of‐pocket medical expenses. To investigate the underlying sources of these wealth‐health gaps, we build a heterogeneous‐agent life‐cycle model in which health and wealth evolve endogenously. In the model, agents exert efforts to lead a healthy lifestyle, which helps maintain good health status in the future. Effort choices, or lifestyle behaviors, are subject to adjustment costs to capture their habitual nature in the data. We find that our estimated model generates the great majority of the empirical wealth gaps by health and quantify the role of earnings and savings channels through which health affects these gaps. We show that variations in individual health efforts account for around a quarter of the model‐generated wealth gaps by health, illustrating their role as an amplification mechanism behind the gaps.
Random Votes to Parties and Policies in Coalition Governments
Authors: Cervellati Matteo , Gulino Giorgio , Roberti Paolo
Published: September 2024

We exploit a natural experiment involving a randomization of votes across parties within coalitions in all local elections in Italy for over a decade. A lottery on the position of party symbols in the ballot papers allows estimating the causal effect of increasing votes to parties for coalition policies. A non‐marginal random boost of votes shifts budgetary spending towards the treated party's platform, but only for issues that are salient in that party's political manifesto. We study the chains of mechanisms mapping votes into policies and link it to an increase in bargaining power within legislative majorities. Parties leverage their higher electoral support to gain the appointment of politically affiliated cabinet members. Empowering different parties also leads to the selection of cabinets with different socio‐demographic characteristics. The unintentional experiment helps shed new light on mechanisms mapping votes to parties into coalition policies.
Generative AI
Authors: Bharti Ipsa , Chauhan Kavita , Aggarwal Priyanka
Published: September 2024

Generative artificial intelligence (GenAI) is one part of the diverse AI universe adapting to the growing needs in the business world. This adaptability covers other forms including images, writing codes, and further imitating emotional quotient as well as human-level creativity by implementing a toolkit called natural language processing (NLP), a monumental toolkit that equips the computers to understand, manipulate, and generate human-like language. This chapter explores how GenAI is impacting businesses and can use it to boost productivity to gain an advantage over their competition. To understand the opportunities and challenges posed by GenAI and to offer a new view, published literature as well as official reports by companies and government were studied. It is advised that the managers incorporate AI in their strategies not as mere IT but as a fundamental part of the company. Integrating GenAI will benefit companies by increasing their value proposition. Before the edge provided by GenAI becomes less distinct, businesses should adopt it to prevent themselves from lagging.
Scoping Review on Financial Distress Prediction in India Using Modern Methods of Machine Learning
Authors: Fernandes Reynal Lavita , Tantia Veerta
Published: September 2024

Every business has its objective to attain, along with earning profits. A business needs finances and also throws up difficulties in meeting its financial requirements. If ignored, the challenges could affect the business. It is crucial for the business to keep a regular check, necessitating the right, analytical methods. A large number of works of literature have focussed on the traditional methods of predicting financial distress. Recently, a few studies evolved using modern methods. This study has a review of the literature regarding modern methods used in predicting financial distress. The present study has adopted the structure of a scoping review developed by Arksey and O'Malley and the main aim is to showcase the importance of predicting financial distress with modern methods through the machine learning approach. It also aims to highlight the drawbacks of statistical methods while predicting financial distress and covering the reasons for them.
Computational and Experimental Investigation of Camber Morphing Airfoils for Reverse Flow Drag Reduction on High-Speed Rotorcraft
Authors:   Rennselaer Polytechnic Institute, Jacobellis George , Gandhi Farhan , Rice Thomas , Amitay Michael
Published: September 2024

Through computational fluid dynamics simulations and wind tunnel tests this study examines a NACA63-218 airfoil in reverse flow at Re = 375,000, and demonstrates reduction in reverse flow drag through the introduction of reflex camber when the airfoil is pitched nose up in reverse flow. Of the three dominant sources of reverse flow drag - ram pressure on the upper surface near the trailing-edge, suction on the lower surface near the trailing-edge, and bluff body separation at the rounded nose, reflex camber influences the first two, while leaving the third mostly unaffected. The change in trailing-edge geometry reduces exposure to ram drag on the upper surface while the suction on the lower surface rotates to result in a force opposite to the direction of the free stream. Although the 2D CFD simulations (URANS with SA turbulence model) had difficulty predicting the bluff body separation at the airfoil nose well, the change in flow at the trailing-edge was well captured yielding drag reductions of around 60% for a 10° reflex camber (compared to reductions of around 50% in the wind-tunnel test). Even greater percentage reductions in drag (up to 70%) were observed with a larger 15° reflex angle for nose-up pitch angles greater than 5° in reverse flow. With simulations at a higher Reynolds number (1.5 million) showing very similar drag reductions, using reflex camber over inboard blade sections appears to have significant promise for alleviating reverse flow drag on edgewise rotors at high advance ratio.
Outwash Measurement of Joby Pre-Production Prototype
Authors:   Joby Aviation, Bain Jeremy , Nikolaev Sergei , Chavez Ricardo , Naru Ryan , Platt Yasmina , Denham James , Tanaka Hiroyuki
Published: September 2024

Joby Aviation is developing an all-electric air taxi for commercial passenger service. The aircraft takes off and lands vertically using six tilting propellers. Classified as powered lift aircraft by the Federal Aviation Administration, it has many similarities with, and important differences from, traditional helicopters. Joby Aviation partnered with the Federal Aviation Administration to measure the outwash of the Joby Aviation S4 pre-production prototype aircraft and a Robinson R44 light helicopter. The measured data shows that the Joby S4 has similar outwash magnitudes to the R44 despite being flown at approximately twice the weight. It also shows that the caution and hazard zones for outwash based on the 95% maximum velocity and PAXman analysis are very close to the aircraft and well within the established safety areas. The data shows that the outwash of the Joby S4 aircraft does not present an increased risk over traditional light helicopters.
Cohort studies using 3D-CT are needed to assess whether “home Gym-Bed” exercises are beneficial against sarcopenia
Authors: Finsterer Josef
Published: September 2024

I was interested to read the article by Quadrelli et al. on a study on the prevention of sarcopenia using daily "Home Gym Bed" training for 30 minutes per day over 10 years in a 70-year-old man who was examined using 3D CT imaging.1 It was found that muscle mass did not change over the 10 years despite ageing.1 It was concluded that whole-body exercise in bed can help preserve muscle mass and density in older people,1 and that advanced imaging techniques can quantify the effectiveness of non-pharmacological interventions against sarcopenia.1 The study is excellent, but some points should be discussed.[...]
Institutional aspects of the humanisation of medicine today
Authors: Morgante Giuseppe
Published: September 2024

Not available.
Biological Reconstruction of Acromioclavicular Joint Ligament Using Semitendinosus Autograft: A Prospective Study on Functional Outcomes and Complications
Authors: Dussa Praveen , Sagar J. H. Vidya , Yangala Thimma Reddy , Nandiraju Ravikiran , Kajani Nazim , Thakur Shankar Singh , Munawar Mohd. Tanzeel
Published: September 2024

Introduction:

The acromioclavicular (AC) joint, a crucial point of shoulder articulation, facilitates overhead and across-the-body arm movements. Athletes, especially those in high-contact or fall-prone sports, frequently experience AC joint injuries. These injuries, based on the Rockwood classification, range from type I to type VI, with treatments varying accordingly. One innovative treatment method reconstructs both ligaments using a semitendinosus autograft, aiming for an anatomical and functional restoration of the joint. This study evaluates the outcomes and complications of this method.

Methodology:

Study design: A prospective study from January 2021 to July 2022. Data source: Patients with Rockwood type III to VI AC joint ligament disruptions treated at Osmania General Hospital. Sample size: 14 patients.

Surgical Technique for Acromioclavicular Ligament Reconstruction:

Detailed steps encompassing patient positioning, graft harvesting and preparation, surgical approach, graft fixation, and postoperative care.

Results:

A total of 14 patients with AC disruptions (12 men and 2 women) treated with semitendinosus reconstruction were followed up for 24 months. Out of 14, 13 were Rockwood type III and 1 was type V ACJ dislocations. The mean patient age was 41 years (25–59 years). Functional outcome was assessed according to the constant-Murley score, according to which 7 patients had excellent, 6 had good, and 1 had an adequate outcome. We had only 1 case of surgical site infection leading to delayed rehabilitation leading to loss of abduction.

Discussion:

AC joint disruptions represent a significant percentage of shoulder injuries, especially among young, active individuals. Conservative treatments are typical for lower-grade injuries, but high-grade injuries often necessitate more invasive approaches. Our study included 14 patients, focusing on a semitendinosus autograft reconstruction. The historical Weaver–Dunn procedure, though once popular, has been phased out due to recurrence and strength issues. Our method, avoiding the controversial coracoid tunnel drilling, has shown promising results with no recorded fractures.

Conclusion:

The semitendinosus autograft method, with its biological orientation for coracoclavicular ligament reconstruction, presents fewer complications, especially in terms of coracoid fractures and reduction losses.
An isomorphism theorem for models of weak König’s lemma without primitive recursion
Authors: Fiori-Carones Marta , Kołodziejczyk Leszek Aleksander , Wong Tin Lok , Yokoyama Keita
Published: September 2024

We prove that if

(M,\mathcal{X})

and

(M,\mathcal{Y})

are countable models of the theory

\mathrm{WKL}^{*}_{0}

such that

\mathrm{I}\Sigma_{1}(A)

fails for some

A \in \mathcal{X}\cap \mathcal{Y}

, then

(M,\mathcal{X})

and

(M,\mathcal{Y})

are isomorphic. As a consequence, the analytic hierarchy collapses to

\Delta^{1}_{1}

provably in

\mathrm{WKL}^{*}_{0} + \neg \mathrm{I}\Sigma^{0}_{1}

, and

\mathrm{WKL}

is the strongest

\Pi^{1}_{2}

statement that is

\Pi^{1}_{1}

-conservative over

\mathrm{RCA}^{*}_{0} + \neg \mathrm{I}\Sigma^{0}_{1}

. Applying our results to the

\Delta^{0}_{n}

-definable sets in models of

\mathrm{RCA}^{*}_{0} + \mathrm{B}\Sigma^{0}_{n} + \neg \mathrm{I}\Sigma^{0}_{n}

that also satisfy an appropriate relativization of weak König’s lemma, we prove that for each

n \ge 1

, the set of

\Pi^{1}_{2}

sentences that are

\Pi^{1}_{1}

-conservative over

\mathrm{RCA}^{*}_{0} + \mathrm{B}\Sigma^{0}_{n} + \neg \mathrm{I}\Sigma^{0}_{n}

is computably enumerable. In contrast, we prove that the set of

\Pi^{1}_{2}

sentences that are

\Pi^{1}_{1}

-conservative over

\mathrm{RCA}^{*}_{0} + \mathrm{B}\Sigma^{0}_{n}

is

\Pi_{2}

-complete. This answers a question of Towsner. We also show that

\mathrm{RCA}_{0} + \mathrm{RT}^{2}_{2}

is

\Pi^{1}_{1}

-conservative over

\mathrm{B}\Sigma^{0}_{2}

if and only if it is conservative over

\mathrm{B}\Sigma^{0}_{2}

with respect to

\forall \Pi^{0}_{5}

sentences.
Electric Vehicle Lithium-Ion Battery Thermal Management by Numerical Simulation with PCM and Fins over Shell
Authors: Yogeshwar Dasari , Repaka Ramjee
Published: September 2024

The study aims to develop a Battery Thermal Management System (BTMS) that incorporates phase change material (PCM) and various types and quantities of fins to reduce the battery surface temperature when discharging at varied C rates. A computational model is created to study an NMC Lithium-Ion Battery (LIB) having a form factor of 21700 and a capacity of 4900 mAh. The cylindrical battery's anisotropic thermal conductivity and specific heat capacity are used to develop a precise thermal model representing its temperature distribution. The battery is placed inside the aluminum cylindrical shell, and the fins are mounted on that shell. The gap between the shells is filled with the PCM. The investigation covers several situations, such as 1C and 2C battery discharge rates, the number of fins, and fin shapes. The fins act as a network of heat sources to disperse thermal energy evenly between the LIB and the PCM. Studying the impact of various fin shapes on the BTMS performance showed small variations in battery temperature among different fin forms. The numerical study showed that the optimal Battery Thermal Management System consisting of PCM with 10 rhombus fins could keep the battery temperature within the optimum operating range of 313.15 K when the batteries are discharged at 2C rate.
Optimization of Cooling Circuit for Electric Vehicle
Authors: Anandan Ram , Thiyagarajan Rajesh , Sharma Akash , Venkataraman P
Published: September 2024

Thermal management is paramount in electric vehicles (EVs) to ensure optimal performance, battery longevity, and overall safety. This paper presents a novel approach to improving the efficiency of cooling systems in automotive passenger vehicles, focusing specifically on battery circuits and e-motor cooling. Current systems employ separate pumps, degassing tanks, valves, and numerous mechanical components, resulting in complex layouts and increased assembly efforts.

The primary challenge with the existing setup lies in its complexity and the associated drawbacks, including heat energy loss, increased weight, and space constraints. Moreover, the traditional approach necessitates a significant number of components, leading to higher system costs and maintenance requirements.

To address these challenges, this paper proposes an integrated cooling system where the pump, degassing tank, and valves are consolidated into a single housing. This streamlined design reduces the component count by approximately 30%, significantly minimizing the number of hoses and actuators. As a result, the integrated system offers several advantages, including improved efficiency, reduced weight, and space savings of approximately 30%.

The proposed approach will be further validated through experiments, evaluating the performance of the integrated cooling system under various operating conditions, this research aims to demonstrate its effectiveness in enhancing thermal management in automotive applications.
A Study to Establish an Evaluation Method for Selecting Suitable Packing Adhesives for A/C Ducts to Ensure Sustained Adhesiveness in Thermal and Condensation Conditions over the Vehicle's Lifetime
Authors: M Amala Rajesh , Sonkar Surabhi , Kumar Mukesh
Published: September 2024

The purpose of air conditioning (AC) duct packing is multifaceted, serving to prevent condensation, eliminate rattle noise, and provide thermal insulation. A critical aspect of duct packing is its adhesive quality, which is essential for maintaining the longevity and effectiveness of the packing's functions. Indeed, the challenge of achieving adequate adhesivity on AC ducting parts is significant due to the harsh operating conditions to which these components are subjected. The high temperatures and presence of condensation within the AC system can severely compromise the adhesive's ability to maintain a strong bond. Moreover, the materials used for these parts, such as HDPE, often have low surface energy, which further hinders the formation of a durable adhesive bond. The failure of the adhesive under these conditions can lead to delamination of the duct packing, which can result in customer inconvenience due to rattling noises, potential electrical failures if condensed water contacts electrical components beneath the ducting, or loss of thermal energy, thereby reducing the AC system's thermal efficiency.

This paper primarily focuses on developing an experimental methodology to identify the most appropriate adhesive for use in ducting applications. This involves a detailed examination of various adhesive types and designing suitable experiments to evaluate the adhesive bond's resilience, particularly when applied to HDPE blow-molded ducts. The methodology aims to ascertain the conditions under which the adhesive bond fails, ensuring that the selected adhesive can maintain its integrity under the rigors of operational stress and environmental factors. Additional insights gained from the study highlight the influence of surface roughness, resting time, and exposure to extreme temperatures on the lamination quality of duct packing. These findings are crucial for manufacturers to consider when selecting adhesives for AC duct systems, ensuring that the chosen solutions are robust enough to withstand the demanding conditions of automotive environments and maintain the integrity and functionality of the duct packing over time.
Design and Development of a Green Mobile Air Conditioning System for Electric Vehicles
Authors: Maurya Anurag , Venu Santosh , Kapoor Sangeet , Khan Farhan
Published: September 2024

Electric Vehicles (EVs) have rapidly grown as a means for clean mobility, as they zero down tail pipe emission of greenhouse gases. Additionally, greenhouse gases such as Hydro-Fluoro-Carbon (HFCs) based refrigerants used in Mobile Air-Conditioning (MAC) are under global scrutiny for their high Global Warming Potential (GWP). To prevent earth environment to pass the climate tipping point that will be irreversible within human capacity, actions such as rapid phase down of high GWP rated HFCs under Kigali Amendment to Montreal Protocol are enacted. India being amongst signatory nations is now working to fast track phase-down use of high GWP refrigerant and transit to low GWP refrigerant options. Nearly half of national HFCs use and emissions are for manufacture and service MAC. Vehicle OEMs supplying to markets in developing countries (e.g. European nation and non-Article 5 Parties) have already phased out HFC-134a (GWP=1400) through alternate refrigerant solutions.

The work presented here discusses a novel methodology to use sustainable low GWP refrigerant-based MACs in EVs. The existing MAC system operates through dual DX (Direct expansion) system cooling loop, one for cabin cooling requirement and another to ensure optimum cell temperature of high voltage battery. The refrigerant HFC-134a is not sustainable. To meet global commitments, alternative low GWP options such as R152a (GWP=124) can be considered. The superior thermal properties and low direct cost of R152a, makes it a suitable alternative to HFC-134a. The work also discusses development of intelligently controlled Secondary Loop-Mobile Air Conditioning (SL-MAC) system to address operational constraint with mildly flammable nature of R152a. In the proposed architecture, R152a is use as primary medium to produce refrigeration effect to cool the coolant by deploying chiller unit. The cooled coolant is then circulated in secondary loop comprising of two parallel cooling loops, to extract heat from cabin and HV battery systems. Suitable decision matrices have been consider to design the SLMAC configuration and components involved with it. Cooling performance have been compared basis the transition from DX system with HFC-134a to SLMAC system with R152a refrigerant, together with gap analysis and proposed solutions for bridging performance gaps.
A Novel Methodology to Assess the Effectiveness of Passive Cabin Cooling Technology
Authors: Deshmukh Ganesh , Kulkarni Shridhar Diliprao , Varma Mohit , Jaybhay Sambhaji , Kapoor Sangeet , Tilekar Pravin
Published: September 2024

Today, almost all passenger vehicles are equipped with Mobile Air Conditioning (MAC) systems to provide thermal comfort to occupants. To enhance cabin cooling down rate, two approaches are possible viz. increasing the MAC system capacity or reducing heat ingress into the vehicle cabin. The first approach is likely to have a negative impact on energy efficiency. The latter approach considers the deployment of alternate passive cabin cooling technologies. Among these, the deployment of uniquely developed coatings on metal, plastic and glass surfaces of the cabin is one option. The assessment of such coatings is usually done only at severe ambient conditions (>40°C), which may not be sufficient. These coatings need to be validated across all climatic seasons of the year, for assessing their effectiveness on passenger thermal comfort.

The current work along with simulation studies, takes into account additional parameters such as the ‘feeling of hotness’ when one enters a hot-soaked cabin of a typical car not parked under the shade. Further, customer touch point surface temperatures, along with a definition of their acceptance criteria based on thermal comfort considerations, have also been examined in this work.

The proposed new and novel process consists of, defining a physical validation methodology comprising of both, objective and subjective assessments on two vehicles, viz. baseline vehicle without coating and proposed vehicle with coating on multiple surfaces. The objective assessments include a set of DoEs on both the vehicles in controlled ambient conditions in a Climatic Chamber, followed by actual real-world vehicle drives and DoEs on the road. The assessment of deterioration with dust application on the coated surfaces and sensitivity analysis with the removal of the proposed coating on some of the surfaces is also examined. Finally, a jury of experts subjectively assessed the effectiveness of the coating and ranked the, ‘critical to thermal comfort’ parameters, on a ten-point scale.

This novel methodology enables the objective and subjective assessment of a proposed coating and analysis of gaps with respect to target requirements; the primary objective being to arrive at a holistic decision on implementation for series production.
PENGARUH PENDIDIKAN KESEHATAN TERHADAP PENINGKATAN PENGETAHUAN IBU PADA BAYI USIA 0-11 BULAN
Authors: Afdila Reva , Sari Harahap Lili Kartika , Matunnisa Ira
Published: September 2024

Program imunisasi diberikan kepada populasi yang dianggap rentan terjangkit penyakit menular, yaitu bayi, balita, anak-anak, wanita usia subur dan ibu hamil. Kabupaten Aceh Utara hanya mampu mencapi 62% desa UCI. Pada Puskesmas Cot Girek pada tahun 2016, capaian imunisasi lengkap pada anak usia 0-11 bulan masih sangat rendah. Capaian imunisasi HBO hanya 51,4%, BCG 66,5% Polio 1 70,5%, HIB1 60,4% Polio II 76,1%, HIB II 66%, Polio III 74,1 %, HIB III 69,6%, Polio IV 77,7% dan Campak 66,9%. Tujuan penelitian ini untuk mengetahui pengaruh pendidikan kesehatan terhadap peningkatan pengetahuan ibu pada bayi usia 0-11 bulan diwilayah kerja Puskesmas Cot Girek Kecamatan Cot Girek Kabupaten Aceh Utara. Jenis penelitian ini adalah “quasi eksperimental design” dengan rancangan One group pre-test and Post-test design. Populasi pada penelitian ini adalah seluruh ibu bayi (0-11 bulan) pada wilayah kerja Puskesmas Cot Girek yaitu sebanyak 447 orang. Tehnik sampling yang digunakan adalah rancangan klaster (cluster random sampling) dengan besaran sampel 82 orang. Terdapat perbedaan nilai mean antara pengetahuan ibu tentang imunisasi dasar lengkap pada bayi 0-11 bulan sebelum dan setelah diberikan pendidikan kesehatan yaitu sebesar -7,239. Ibu bayi 0-11 bulan agar memberikan imunisasi secara lengkap pada bayinya agar dapat melindungi bayi dari penyakit menular khususnya Penyakit Yang Dapat Dicegah Dengan Imunisasi.
PENGARUH PRENATAL GENTLE YOGA UNTUK MENGURANGI NYERI PUNGGUNG PADA IBU HAMIL
Authors: Sari Maya , Mahara Khairunnisa , Lestari Jayanti Rida
Published: September 2024

Pendahuluan : Nyeri punggung merupakan keluhan yang mayoritas dirasakan oleh ibu hamil. Di Indonesia pada tahun 2017 didapatkan bahwa 68% ibu hamil mengalami nyeri punggung dengan intensitas sedang, dan 32% ibu hamil mengalami nyeri punggung dengan intensitas ringan. Berbagai upaya dapat dilakukan untuk mengurangi keluhan nyeri punggung saat hamil, salah satunya dengan melakukan prenatal gentle yoga, karena dapat meningkatkan fleksibilitas dan keseimbangan dari otot anterior dan posterior lumbal sehingga dapat mengurangi nyeri punggung saat kehamilan. Tujuan penelitian ini mengetahui pengaruh prenatal gentle yoga terhadap nyeri punggung pada ibu hamil di Desa Matang Seulimeng Kota Langsa. Metode : metode yang digunakan dalam penelitian ini eksperimen dengan One Group Pre-Post Test Design. Populasi dalam penelitian ini seluruh ibu hamil yang mengalami nyeri punggung dengan jumlah sempel 10 orang, pengambilan sampel menggunakan teknik purposive sampling. Uji analisis yang digunakan yaitu uji Paired T - tes. Hasil : Penelitian ini menunjukkan adanya perbedaan skala nyeri sebelum dan sesudah diberikan intervensi prenatal gentle yoga. Skala nyeri sebelum intervensi prenatal gentle yoga yaitu 3-7 dan sesudah diberikan intervensi prenatal gentle yoga skala nyeri yaitu 0-3. Setelah dilakukan uji paired T- test yang hasilnya ρ value = 0,000 < ɑ (0,05) artinya ada pengaruh antara prenatal gentle yoga  dengan nyeri punggung pada ibu hamil
HUBUNGAN INTENSITAS NYERI DENGAN PEMENUHAN KEBUTUHAN ISTIRAHAT DAN TIDUR PADA PASIEN POSTOPERASI EKSTREMITAS BAWAH DI RUMAH SAKIT
Authors: Taufik  , Ikhsan Muhammad , Hermansyah  , Asniah Syamsuddin  , Ainal Mardhiah
Published: September 2024

Background Nyeri merupakan rasa sakit yang dialami oleh tubuh yang disebabkan karena adanya kerusakan jaringan  atau rangsangan lainnya yang mengganggu keseimbangan tubuh dan juga merupakan permasalahan yang sering terjadi pada pasien postoperasi fraktur dan selalu memberi dampak pada tubuh, diantaranya adalah gangguan pemenuhan kebutuhan istirahat dan tidur. Kebutuhan istirahat dan tidur yang terpenuhi dapat mengakibatkan gangguan mental, emosional dan kesehatan. Tujuan dari penelitian ini adalah untuk mengetahui hubungan intensitas nyeri dengan pemenuhan kebutuhan istirahat dan tidur pada pasien postoperasi fraktur ekstremitas bawah di Rumah Sakit. Method Penelitian ini merupakan quantitative research dengan menggunakan desain cross sectional study. Jumlah sampel yang digunakan dalam penelitian ini sebanyak 81 orang pasien posoperasi fraktur ekstremitas bawah. Instrumen penelitian menggunakan skala nyeri Numerical Rating Scale (NRS), Fatigue Assesment Scale (FAS) dan Pittsburgh Sleep Quality Index (PSQI). Data dianalisis menggunakan program SPSS versi 23 dengan  uji Chi-square. Result Hasil penelitian menunjukkan bahwa ada hubungan yang signifikan antara intensitas nyeri dengan pemenuhan kebutuhan istirahat dengan (p=0,044 ; OR=3,630) dan ada hubungan antara intensitas nyeri dengan pemenuhan kebutuhan tidur dengan (p=0,031 ; OR=3,938). Conclusions Diharapkan kepada perawat untuk dapat membantu pasien postoperasi fraktur ekstremitas bawah sehingga dapat menemukan cara untuk mengatasi intensitas nyeri, agar pemenuhan kebutuhan istirahat dan tidur pada pasien postoperasi fraktur ekstremitas bawah dapat terpenuhi.
PENGARUH MEDIA LATIHAN (BARRIER HOP DAN BOX JUMP) DAN TINGKAT PERCAYA DIRI TERHADAP KETERAMPILAN JUMP SERVICE BOLA VOLI
Authors: Syaleh Muhammad , Hendrawan Dicky , Irwandi Irwandi , BR Meliala Firda Olivia
Published: September 2024

Arah dan tujuan penelitian adalah mencari pengaruh media latihan (barrier hop dan box jump), tingkat percaya diri terhadap keterampilan jump service bola voli kemudian berikut ini adalah hal-hal yang ingin ditentukan dalam penelitian ini: 1) Apakah servis lompat mendapat manfaat dari pelatihan lompat penghalang? 2) Apakah servis lompat mendapat manfaat dari latihan lompat kotak? 3) Seberapa percaya diri diri sendiri saat bermain bola voli? kemampuan servis lompatan? Penelitian ini menggunakan metodologi penelitian “two-group pretest-posttest design”. Dalam penelitian ini, tes jump serve yang memiliki reliabilitas 0,99 dan validitas 0,989 digunakan sebagai metode penelitian. Subjek penelitian berjumlah dua puluh empat siswa. Proses analisis data menggunakan uji t dengan ambang signifikansi 5%. Berikut kesimpulan penelitian: Latihan barier hop meningkatkan servis lompat bola voli siswa lebih lanjut, hal ini ditunjukkan dengan nilai t hitung (2,133) > t tabel (1,720) dan nilai signifikansi (0,026) < dari (0,05). T hitung (8,660) > t tabel (2,201) dan nilai signifikansi (0,000) < (0,05) menunjukkan bahwa (1) latihan barier hop berpengaruh terhadap servis lompat, dan (2) latihan lompat kotak berpengaruh dengan t hitung ( 3,522) > t tabel (2,201) dan nilai signifikansi (0,005) < dari (0,05). Setelah dilakukan pengujian, perbedaannya adalah 1,75 cm.AbstractThe following are the items that this study seeks to determine: 1) Does jump serving benefit from barrier hop training? 2) Does jump serving benefit from box jump practice? 3) How confident is oneself when playing volleyball? leap serve capability? This study used the "two-group pretest-posttest design" research methodology. In this study, the jump serve test—which has a reliability of 0.99 and validity of 0.989—was employed as a research method. The research subjects comprised twenty-four students. The data analysis process employed the t test with a significance threshold of 5%. The following are the research's conclusions: (1) t count (8.660) > t table (2.201) and significance value (0.000) < (0.05) indicate that barrier hop training affects jump serves; (2) t count (3.522) > t table (2.201) and significance value (0.005) < than (0.05) indicate that the jump training box has an impact. In comparison to other training techniques, barrier hop training enhances students' volleyball jump serves, as demonstrated by the calculated t value (2.133) > t table (1.720) and the significance value (0.026) < (0.05). Following testing, there was a 1.75 centimeter discrepancy.
PENGARUH LATIHAN DRILL TERHADAP KECEPATAN RENANG GAYA BEBAS PADA SISWA SMP 18 BANDA ACEH
Authors: Munzir Munzir , Malik Abdul , Is Zulheri
Published: September 2024

Kecepatan dalam renang gaya bebas merupakan elemen vital bagi seorang perenang untuk mencapai performa terbaik. Salah satu faktor penting yang dapat mempengaruhi kecepatan renang adalah latihan drill yang tepat. Penelitian ini bertujuan untuk mengetahui pengaruh latihan drill terhadap kecepatan renang gaya bebas pada siswa SMP 18 Banda Aceh. Penelitian ini menggunakan metode pendekatan kuantitatif dengan mengunakan desain one- group pretes- postes. Sampel yang digunakan dalam penelitian@ini berjumlah 30 siswa@kelas VIII dengan tehnik penarikan sampel mengunakan teknik total sampling. Instrumen pengumpulan data adalah tes kecepatan renang gaya bebas berdasarkan komponen gerak dasar. Data pre- test  diperoleh sebelum perlakuan dan data pos-test diperoleh setelah perlakuan. Hasil penelitian menunjukkan perbedaan yang signifikan antara skor pre- test (M=67.27, SD=1.780) dan skor pos- test (M=62.13, SD=1.925). Hasil uji hipotesis menggunakan uji-t menunjukkan nilai signifikansi sebesar 0,000 (p<0.05) dengan t-hitung 30.877 lebih besar dari t-tabel 1.69726. Hal ini menunjukkan bahwa latihan drill berpengaruh positif dan signifikan terhadap peningkatan kecepatan renang gaya bebas pada siswa.
 
AbstractSpeed in freestyle swimming is a vital element for a swimmer to achieve the best performance. One of the important factors that can affect swimming speed is proper drilling. This study aims to determine the effect of drill training on freestyle swimming speed in SMP 18 Banda Aceh students. This study uses a quantitative method with a one-group pretest-posttest design. The research sample amounted to 30 grade VIII students which was determined by the total sampling technique. The data collection instrument is a freestyle swimming speed test based on basic motion components. Pretest data were obtained before treatment and posttest data were obtained after treatment. The results showed a significant difference between the pretest score (M=67.27, SD=1.780) and the posttest score (M=62.13, SD=1.925). The results of the hypothesis test using the t-test showed a significance value of 0.000 (p<0.05) with a t-count of 30.877 greater than the t-table 1.69726. This shows that drill training has a positive and significant effect on increasing freestyle swimming speed in students.
The Effectiveness of Pedestrian Crossing Bridges for Urban Areas in Indonesia Based on Crossing Times and Pedestrian Perspective
Authors: Hariani Mira Lestira , Maharani Rifqi Putri , Septiani Ayunindita Aida
Published: September 2024

The use of pedestrian bridges is often ineffective as pedestrians tend to prefer crossing directly on the roadway, even though heavy traffic conditions increase the risk of accidents. This lowers the safety level of crossers and causes traffic problems. This study aims to evaluate the efficient use of pedestrian bridges and determine public perceptions of road crossing facilities. The research was conducted using geometric assessment and road performance evaluation methods that refer to the 2023 Indonesian Road Capacity Guidelines. In addition, crossing times were analyzed based on the traffic TCT distribution histogram, as well as pedestrian perceptions of crossing facilities. The evaluation results show that the effectiveness of road services falls into category A. Based on pedestrian perceptions, 60% of respondents prefer to cross directly on the roadway, with an average TCT of 1.2 m/sec. From the results of the CSI analysis, the level of respondents' satisfaction with the condition of the pedestrian bridge is 71.373%. Based on the results of the study, the use of pedestrian bridges will be effective in the next 15 years. Recommendations proposed to increase the effectiveness of the use of pedestrian bridges and the level of pedestrian safety is the use of guardrails.