bluuebunny/crossref_metadata_2025 huggingface dataset:
Utility of pre-operative abdominal ultrasound to predict conversion to open cholecystectomy
Authors: Sharma Reetesh , Dumbre Ramesh , Fernandese Arun , Phalgune Deepak
Published: September 2021

Background: Many factors like unclear Calot triangle anatomy, intensely inflamed and thick gallbladder, dense adhesions in the operative area, obscure biliary tree anatomy, local inflammation like pancreatitis contribute to the conversion of laparoscopic cholecystectomy to open cholecystectomy. The aim of the present study was to find the utility of abdomen sonography parameters that predict the conversion from laparoscopic to open cholecystectomy.Methods: Ninety patients aged between 20 and 75 years with the diagnosis of cholelithiasis/cholecystitis were included in this observational study. Every patient underwent ultrasonography (USG). The USG findings such as gallbladder wall thickness, presence or absence of stones, number of calculi, size of the calculi, presence of abdominal adhesions, size of the common bile duct was recorded. If feasible, laparoscopic cholecystectomy was done. If not, the procedure was converted to open cholecystectomy. Association of USG findings was correlated with conversion to open cholecystectomy. The comparison of the qualitative variables was done using Fisher’s exact test. Results: Of 90 patients, 7 (7.8%) had a conversion to open cholecystectomy. There was no statistically significant difference of USG parameters studied such as gallbladder wall thickness >4 mm, pericholecystic fluid collection, common bile duct diameter >7 mm, presence of calculus, number of calculi, size of calculus >6 mm and adhesions/fibrosis in patients who required conversion to open cholecystectomy and who were operated laparoscopically.Conclusions: Pre-operative USG parameters did not predict conversion to open cholecystectomy.
Obstruction at the level of foramen of monro causing obstructive hydrocephalus
Authors: Kashyap Dushyant , Chug Ashish , Punia Prashant , Gotecha Sarang , Ranade Deepak , More Bhagirath , Chhabra Shobhit , Raghu Vybhav
Published: September 2021

Background: The foramen of monro is also known by the name of interventricular foramen. The study was conducted to determine the etiology, clinical picture, radiological features, and different modalities of management and related complications.Methods: A prospective study of 30 cases with diagnosis of hydrocephalus due to obstruction at the interventricular foramen. Lesions at the foramen of monro were addressed either by open craniotomy approach or neuroendoscopy approach. For open craniotomy transcortical or interhemispheric approach was preferred and Karl Storz’s LOTTA system was used for all the neuroendoscopic procedures.Results: Craniopharyngioma and colloid cysts were the most common pathology in children and adults respectively. Endoscopic approach was particularly helpful in decreasing the convalescence period and postoperative complications. Wound site CSF leak is the most commonly faced complications. In our study, out of 30 patients, males accounted for 23 (77%) cases and females for 7 (23%) cases. Majority were in the age group of 20-40 years. The most common presenting complaints of patients having foramen of monro obstruction with hydrocephalus were headache and vomiting. Gadolinium enhanced contrast MRI of brain was the investigation of choice for diagnosing these lesions.Conclusions: Endoscopic approach can be offered as a first line of treatment as a part of standard treatment in all patients having foramen of monro obstruction. It obviates the need for multiple shunt procedures. Although small solid lesions less than 3 cm in size can be addressed by endoscopic approach, the learning curve required for endoscopic approach to deal with solid lesions is very steep.
D-shape asymmetric excision with primary closure versus limberg flap surgery for sacrococcygeal pilonidal sinus
Authors: Rajendra Naveen , Karigowda Venugopal , Raju Girish Honnavara , Suresh Nitish
Published: September 2021

Background: Treatment of sacrococcygeal pilonidal disease with off-midline closure after excision has been suggested to improve surgical outcomes. The aim of this study was to compare the short-term outcomes in patients with sacrococcygeal pilonidal disease, who underwent D shaped asymmetrical excision with flap reconstruction and Limberg flap reconstruction.Methods: An analysis of 50 patients was done; 25 were treated with D shaped asymmetrical excision with flap reconstruction and 25 with Limberg flap reconstruction procedure from September 2015 to Feb 2017 and were followed up for six months to 1 year.Results: There were significant difference between group 1 and group 2 with respect to operation time (mean: 40.20±3.19 min and 49.24±3.76 min, p<0.001), blood loss (mean: 45.64±2.93 mland 61.04±3.34 ml, p<0.001). Visual analog scale score was evaluated on postoperative day 15 and 30. On postoperative day 15, VAS score was 2.52±0.77 in group 1 and 3.12±0.97 in group 2. On day 30, VAS score was 1.56±0.77 in group 1 and 2.16±0.94 in group 2, and the differences were statistically significant. The complications were lesser I patients with D shaped asymmetric excision when compared to Limberg flap.Conclusions: The D-shape procedure is an easier and safer treatment option when compared to Limberg flap for the surgical treatment of sacrococcygeal pilonidal sinus disease owing to the associated low complication rate, short duration to return to normal activity, faster healing, and a high patient satisfaction rate and an easier learning curve.
A prospective study of post-operative surgical site infections after abdominal surgeries
Authors: Jain Sanjay , Shivhare Rahul , Pardhan Shoranki , Chaurasiya Deepti
Published: September 2021

Background: Surgical site infections have plagued surgeons since time immemorial. There is significant morbidity and mortality associated with surgical site infections. In this study we tried to identify the incidence, various patient and procedure related factors, which could have led to SSIs, the various organism associated with the SSIs and their pattern of sensitivity and resistance to various antibiotics.Methods: This study was conducted in the department of general surgery, Gandhi medical college and Hamidia hospital Bhopal. In this prospective study, we included all patients more than 12 years of age undergoing abdominal surgeries between 2018-2020. Patient data was recorded in a case recording form and all patients were examined post-operatively for soakage along with culture and antibiotic testing.Results: A total of 299 patients were included. Overall incidence of SSI was 23.07%, elective surgeries showed 19.5% incidence and elective showed 26.08% incidence. Higher incidence of SSI was found in, male patients (25.9%), contaminated and dirty surgeries, higher ASA scores, smokers, alcoholics diabetics, anaemics, and malnourished patients. E. coli and klebsiella were the most common organisms isolated in both elective and emergency setting. Organisms isolated were highly sensitive to colistin, meropenem, imipenem, gentamicin and amikacin. Amoxycillin, ceftriaxone, doxycycline were fairly resistant in the current study.Conclusions: Modifiable risk factors like smoking, alcoholism, anaemia, malnourishment, contaminated wound class and emergency surgeries should be addressed systematically along with judicious use of antibiotics and tailoring then according to culture profile whenever possible is needed to reduce SSI rate.
Jejuno-Ileal tumors: a retrospective study
Authors: Thakur Mohim , Vats Ravinder , Goel Deep , Bhalla Virandera P.
Published: September 2021

Background: Primary tumors of the jejunum and ileum are rare and this segment of gastrointestinal tract is relatively inaccessible to conventional endoscopy, leading to a delay in diagnosis. Due to its rarity, data of primary jejunoileal tumors is still scarce, especially in India where diagnostic modalities like capsule endoscopy is not widely available. Herein we aim to discuss the clinico-radiologic findings, pathology and surgical management of such tumors. Methods: Of the total 51 small bowel resections done in our institute during the period from year 2012 to 2015, 14 patients were identified who were diagnosed with jejunoileal benign/malignant jejunoileal tumors. Records were analysed with respect to patient demographic data, clinical features, radiologic findings, surgical management, histopathology and postoperative outcomes.Results: Jejunoileal tumors are more common in males (77%) and first presentation was intestinal obstruction (50%) in majority of patients. A definite preoperative diagnosis based on radiologic/endoscopic means was possible in six patients (46%). Patients were operated and laparoscopic group showed superior outcomes in terms of postoperative complications. Conclusions: Jejunoileal tumors are an infrequent finding in surgical practice. In our study malignant tumors were more common in proximal small bowel. Computed tomography (CT) enterography can detect small bowel lesions with low sensitivity but allows evaluation of lymphadenopathy/distant metastasis. Laparoscopic resection allows initial staging and has the advantage of early recovery, less wound infection rates and better cosmesis.
Type I second branchial cleft cyst in an adult patient
Authors: Tambat Ramesh M. , Golasangi Nitish A. , B. Siddesh G. , P. Suhas , Shrestha Yogendra , Moktan Jeet B.
Published: September 2021

Branchial cleft anomalies are rare diseases of head and neck region. Second branchial cleft anomalies represent more than 95% of all branchial cleft anomalies. Second branchial cleft cyst is a benign developmental cyst due to the incomplete obliteration of pharyngeal cleft. A 46-year-old female patient reported to hospital with a complaint of swelling over the left side of the neck since 4 to 5 months. On clinical examination, swelling was seen below and behind the angle of mandible on the left side. The patient was evaluated using ultrasound and contrast enhanced computerized tomography (CECT) of neck which revealed second left bronchial cleft cyst/enlarged cystic lymph-node. Fine needle aspiration cytology of the swelling showed features of cystic lesion. Type-I branchial cleft cyst is a rare condition with a significant risk of misdiagnosis. To avert misdiagnosis and surgical complications, thorough investigation must be performed prior to surgical intervention.
Prevalence of hypothyroidism among patients with obstructive sleep apnea: A study in a tertiary care center
Authors: Sowjanya D.S , Ravindranath M
Published: September 2021

Obstructive sleep apnea is a common disorder wherein there are recurrent episodes of sleep disordered breathing resulting in disrupted sleep and other sequelae. The symptoms of hypothyroidism are very similar to OSA, a number of studies have been performed to analyze their association with conflicting results.

A questionnaire based on the Wisconsin Sleep Apnea questionnaire for quality of sleep, sleep pattern, symptoms during sleep, snoring were asked to 118 patients included in the study. The day time sleep patterns were assessed by the Epworth Sleepiness scale. Polysomnography testing, Saturated oxygen levels, sleep efficiency and arousal index were also done for all the patients. Blood was collected for the detection of thyroid hormones.

There were 82 (69.5%) males and 36 (30.5%) females on the present study out of 118 patients. The mean age of the patients under study was 53.91 ± 4.69 years, the weight was 89.48 ± 12.83 kgs and the BMI was 34.86 ± 6.11. Amongst the patients with OSA and hypothyroid, the apnea hypoapnea index was 66.22 ± 18.31 episodes per hour, and Epworth sleepiness scale was 15.18 ± 5.26 while in patients with OSA and without hypothyroid, it was 24.17 ± 6.29 and 8.25 ± 5.82 respectively.

Our study shows a significant association between OSA and hypothyroidism among patients, thus having a considerable implications in managing the thyroid condition of the patients.
Enhancing the Intercultural Competence of College Students: A Consideration of Applied Teaching Techniques
Authors: Haas Brian W.
Published: September 2021

Many higher education instructions have set forth explicit objectives to improve college students’ intercultural sensitivity and communication. However, there currently exits considerable heterogeneity in terms of the extent and methods that higher education institutions undertake in order to achieve these important goals. This praxis essay provides a framework to understand the process of intercultural learning in college students, the core features of academic cultural psychology, and makes specific recommendations for effective and innovative ways to teach a cultural psychology course to a broad range of undergraduate students. Specific teaching techniques are offered to target specific intercultural learning areas.
The Holistic Analysis of Multicultural Teaching Framework: Capturing Teachers’ Pauses and their Hybrid and Fluid Multicultural Practices
Authors: Freire Juan A. , Valdez Verónica E.
Published: September 2021

James Banks’s framework for determining the levels of integration of multicultural content in teachers’ pedagogy has long been a tool used by researchers worldwide. This article introduces the Holistic Analysis of Multicultural Teaching Framework that rethinks Banks’s framework to allow research analysis to capture the hybrid and fluid aspects of teachers’ multicultural practices as well as the pauses in their practices over time. Data from a study on U.S. dual language teachers’ classroom implementation of multicultural practices serves to illustrate the utility of the Holistic Analysis framework in analyzing teachers’ multicultural practices. Implications for teacher educators and researchers are discussed.
El silenciamiento como posibilidad de un lenguaje filosófico en los Aportes a la filosofía de Martin Heidegger
Authors: Córdoba Ospina Gerardo
Published: September 2021

El presente texto aborda el parágrafo 36 de los Aportes a la filosofía de Martin Heidegger, para desde este exponer una vía de comprensión de esta obra en torno al lenguaje filosófico-poético, vía que llevaría a considerar el pensamiento del filósofo como una posibilidad de un proyecto pensante que no asumiría el lenguaje como mero medio de enunciación del ente, como instrumento de la razón, sino que lo piense como modo de darse el Ser mismo. En este sentido, se piensa al lenguaje como silenciamiento (Erschweigung) y, al pensarlo de esta manera, se presenta como modo en el que el ente se decide y el hombre se ajusta a su esencia. El texto toma como reflexión la inflexión hecha por Heidegger con respecto al pensar y al poetizar como ámbitos en los que el lenguaje se da como posibilidad de escucha, pero también de dicción. En esta última se juega el todo del ente, como se mencionará al final, al considerar algunas palabras de Nietzsche, que el mismo Heidegger piensa.
El tábano y el parricida. Notas sobre la asunción del nombre propio en la formación filosófica universitaria
Authors: Prósperi Germán Osvaldo
Published: September 2021

El objetivo de este artículo consiste en mostrar que no basta con cuestionar las opiniones establecidas y con argumentar dialécticamente para adoptar una actitud filosófica; es preciso además matar al Padre, es decir asumir un nombre propio, un lugar de enunciación que conlleva una colisión más o menos polémica con los pensadores con quienes dialogamos. Si Sócrates representa la figura del tábano que cuestiona y persuade, el Extranjero del Sofista representa la figura del parricida. Sostendré entonces que la actitud filosófica solo puede explicarse en toda su amplitud y profundidad a partir de estas dos figuras. Asimismo, mostraré que la institución académica tiende a privilegiar la figura del tábano en detrimento de la figura del parricida.
Intolerancia en las sociedades contemporáneas: una mirada al problema religioso desde una postura feuerbachiana
Authors: Valero Sánchez Gerardo José
Published: September 2021

El siguiente texto se circunscribe en el ámbito de la filosofía de la religión; tiene como objeto central analizar la alienación del hombre dentro del fenómeno religioso (particularmente en las religiones monoteístas) y cómo esta origina intolerancia social en las sociedad contemporáneas entre hombres que no comparten las mismas creencias;  esta postura ha causado momentos de violencia extrema a lo largo de la historia humana y otra tanta en la actualidad como el conflicto en el Medio Oriente – Judíos y Musulmanes. Para tal empresa tomaremos como referencia la crítica a la religión expuesta por el pensador alemán del siglo  XIX Ludwig Feuerbach en su obra principal: La esencia del cristianismo (Das Wesen des Christentums), complementándolo con otros críticos religiosos (Voltaire, Kirsch, Freud, etc.). Por último, expondremos el ateísmo humanista de Feuerbach como alternativa para la superación de la intolerancia social.
Reseña. La navaja de Ockham, una lectura lírica y filosófica
Authors: Duque Naranjo Nicolás
Published: September 2021

Reseña del libro En el principio existía el axioma de no contradicción (Hacia Guillermo de Ockham por la Literatura y la Filosofía) Andrés Felipe López (2019). Madrid: Editorial Verbum, S.L. 140 pp.
Preguntas orientadoras para la síntesis de catalizadores y su uso en reacciones de oxidación catalítica selectiva
Authors: Cortés-Ortiz William Giovanni , Guerrero-Fajardo Carlos
Published: September 2021

En el presente documento se presenta una breve historia de la catálisis, así como de los procesos de oxidación selectiva de hidrocarburos. Por otra parte, se mencionan los conceptos básicos involucrados en la catálisis heterogénea haciendo énfasis en el papel de los materiales catalíticos en procesos químicos de oxidación y planteando una serie de preguntas orientadoras que se deben seguir al momento de abordar un proceso catalizado por materiales sólidos. De la misma manera, se muestra los métodos de síntesis de catalizadores denominados en la literatura como sol-gel e impregnación, identificando la influencia de cada etapa de preparación con las propiedades físicas y químicas de los materiales. Finalmente, se presenta un caso de estudio aplicado a la oxidación catalítica selectiva de metano y metanol empleando materiales catalíticos de hierro, molibdeno y vanadio sintetizados por el método sol-gel.
Temperature-Dependent Thermal Conductivity Measurement System for Various Heat Transfer Fluids
Authors: Anggraini Yunita , Silalahi Alfriska O. , Sutjahja Inge Magdalena , Kurnia Daniel , Viridi Sparisoma , Wonorahardjo Surjamanto
Published: September 2021

Accurate measurement of the thermal conductivity of a heat transfer fluid (HTF) is important for optimizing the performance of a thermal energy storage system. Herein, we develop a system to measure the thermal conductivity of an HTF during temperature variation, and the system was checked to measure several samples comprising water, lauric acid, stearic acid, oleic acid, and coconut oil. The thermal conductivity was measured using a KS-1 sensor of a KD2 Pro analyzer. In the study, a static heat conducting medium was used to control the temperature of the fluid, instead of the commonly used flowing water bath. The measured thermal conductivities of water (298 to 318 K) and lauric acid (323 to 373 K), stearic acid (358 to 372 K), oleic acid (334 to 372 K), and coconut oil (298 to 363 K) were compared to data from previous studies and fitted to available models. The accuracy of the data is further analyzed by relating the number of C and H atoms in the fatty acid, and the fatty acid content in coconut oil.
CBRN Events and Crisis Communication: Analysis of Training Needs and Development of Curriculum for Communication Personnel
Authors: Choudary Saman , Asghar Muhammad Usman , Ibrahim Ahmed Gamal
Published: September 2021

Crisis communication is one of the key components of chemical, biological, radiological and nuclear (CBRN) events management and the successful management of a CBRN event depends on the execution of effective and timely crisis communication mechanisms, institutionalized in the response network. A CBRN event in form of an accident, incident or terrorism attack presents a unique environment and challenges for communication, which requires a specialized communication response, based on well-tailored education and training of the communication personnel. This calls for development of an objective and comprehensive approach towards crisis communication, indoctrinated and designed in a well-defined curriculum based on theoretical scholarship and operational training. Therefore, the aim of this study was to determine and address the needs for CBRN related crisis communication and to develop a CBRN training curriculum for communication personnel. This research was pursued by means of needs assessment method involving an online survey targeted towards specific set of stakeholders involved within the field of CBRN defense and crisis communication. Situational awareness, knowledge about risks, operational information, and training in terms of understanding the origin of CBRN events, chain of response network, message formulation, conducting interviews, and employment of communication techniques while reporting on specific CBRN scenarios have been identified as specific training needs. On the basis of the findings of the survey, the training curriculum has been developed and suggested, which will contribute to the sufficient communication training of communication personnel, leading to development of extensive communication competencies and skills in the field of CBRN defense, benefiting the nation-states.
A General Multi-Risk Assessment Method for Natural Disasters and CBRNe Attacks
Authors: Carbonelli Marco , Gratta Laura
Published: September 2021

This work is the result of a research activity started in 2012 to deploy a method for risk assessment to be applied by the Italian Civil Protection and Civil Defence to protect critical infrastructures. The here presented Multi-Risk Assessment Method (MRAM), illustrates the complete approach, provided by this research activity, suitable to estimate both impact and risk in qualitative, semi-quantitative and quantitative fashion for catastrophic or calamitous events, including terrorist non-conventional CBRNe attacks. In the paper a vulnerability reduction assessment methodology is also hinted with an analysis of the relation of MRAM with the USA RAMCAP approach adopted by Department of Homeland Security. The MRAM provides a method for risk assessment, and was also recently implemented in forecasting software tools by some Italian local administrations.
Being a Gynecologist Doctor Specialized in IVF, a Mother and a Woman at the Time of COVID-19
Authors: Ferrero Susanna
Published: September 2021

The COVID-19 pandemic is affecting people around the world with terrible impacts on health, economy, social and psychological aspects and so on, but in this paper, I would like to focus attention on how this situation is worsening the female world. Although men have been shown to have a higher risk factor due to the presence of testosterone, women are severely affected due to: Health Impact • Reduction of life expectancy in terms of delay on necessary oncological checks and consequent progression of related pathologies; • Delay/Stop in taking up the battle against the infertility which can result in potential depression; • A significant increase in fears for both, the woman herself and the incoming creature. Social Impact: The ability to resilience and manages critical situations have always been a female peculiarity but we cannot fail to consider objective data such as: • Reduced chances to save the job position after a severe economic crisis; • Enormous stress for the dual role of mother and worker aggravated by the distance learning (DAD) In this work I will bring to the attention my experience in this emergency period as a gynaecologist doctor specialized in In Vitro Fertilization (IVF); as a mother and as a woman living this situation in the Italian Society.
The Detection of Brain Tumors Using Chan-Vese Active Contour Without Edges Method in Magnetic Resonance (MR) Images
Authors: Mütevelli Makbule Hilal , Ergin Semih
Published: September 2021

Accurate and automatic detections of brain tumors are vital. The aim of this study is to detect brain tumors in Magnetic Resonance (MR) images and to classify these tumors with a high degree of accuracy. After removing skull, the suspicious regions including tumors in the MR images were detected by using K-means clustering, K-means clustering in Lab color space, and the Chan-Vese without edges algorithm. At this stage, a performance evaluation of these three different methods was investigated, and it was seen that the best result was obtained in the Chan-Vese active contour without edges algorithm. For the classification stage, various features such as shape-based features, gray level co-occurrence matrix features, histogram of oriented gradients features, local binary pattern features, and statistical features were extracted from the detected suspicious regions. Finally, the suspicious regions were classified by k-nearest neighbor (k-NN), Fisher’s linear discriminant analysis (FLDA), random forest, decision tree, support vector machines (SVM), logistic linear classifier (LLC), and Naive Bayes classification methods. As a result of this study, it was determined that the FLDA classifier provided the best results with 93.01% accuracy, 93.46% sensitivity, and 96.50% specificity rates in classification for benign tumors, malignant tumors, and healthy (without tumor) cases.
Three-Dimensional Image Quality Evaluation and Optimization Based on Convolutional Neural Network
Authors: Luo Xiujuan
Published: September 2021

Currently, three-dimensional (3D) imaging has been successfully applied in medical health, movie viewing, games, and military. To make 3D images more pleasant to the eyes, the accurate judgement of image quality becomes the key step in content preparation, compression, and transmission in 3D imaging. However, there is not yet a satisfactory evaluation method that objectively assesses the quality of 3D images. To solve the problem, this paper explores the evaluation and optimization of 3D image quality based on convolutional neural network (CNN). Specifically, a 3D image quality evaluation model was constructed, and a 3D image quality evaluation algorithm was proposed based on global and local features. Next, the authors expounded on the preprocessing steps of salient regions in images, depicted the fusion process between global and local quality evaluations, and provided the way to process 3D image samples and acquire contrast-distorted images. The proposed algorithm was proved effective through experiments.
Accurate and Efficient Differentiation Between Normal and Epileptic Seizure of Eyes Using 13 Layer Convolution Neural Network
Authors: Brahmaiah Veeramosu Priyanka , Sai Yarlagadda Padma , Prasad Mahendra N. Giri
Published: September 2021

Epileptic seizure is one which affects the normal brain activities of human being and considered to be a risky disease. The eye ball movement signals pattern plays a significant role in determining the epileptic seizure in precise manner. In addition to it, EOG signals has its influence in detecting epileptic seizure through assessment of eye ball movement signals precisely. Detecting Epilepsy using genetical based Convolutional Neural Network plays a major role in the previous research works. Conversely, the existence of background noise on eye ball signals may impact on the outcome failure. Noise aware Epileptic Seizure Detection using Thirteen Layer Convolution Neural Network (NESD-TLCNN) is adopted in this research to mitigate this issue and thereby ensuring the prediction rate more precisely. Furthermore, Hybrid Dynamic Time Wrapping based Hidden Markov Model (HDWT-HMM) is greatly utilized for primary background noise detection and removal by estimating the noise depending on distance metric. Once after the completion of noise estimation, perfect detection of epileptic seizure is accomplished using feature extraction. The peculiar features involved are saccade, fixation and blink features. Subsequently, Particle swarm optimization (PSO) technique is also involved in this research for optimal feature selection. Thirteen Layer Convolution Neural Network (TLCNN) is applied at last for learning and differentiation of epileptic seizure from the normal eyes. This research is being carried out in MATLAB platform which also reveals that the anticipated methodology produces improved outcomes when contrasted with the existing research work.
Çalışmaya Tutkunluğun İş ve Yaşam Tatmini Üzerindeki Etkisini Belirlemeye Yönelik Tekstil Sektörü Çalışanları Üzerinde Bir Araştırma
Authors: Bekiroğlu Çiğdem , Sırkıntıoğlu Yıldırım Şükran
Published: September 2021

Bu araştırmanın amacı çalışmaya tutkunluğun iş ve yaşam tatmini üzerine etkisinin irdelenmesidir. Bu amaç doğrultusunda araştırma Kastamonu ilinde yer alan bir tekstil firmasındaki çalışanlardan oluşan 303 kişi üzerinde anket yoluyla gerçekleştirilmiştir. Elde edilen veriye SPSS 25.0 programı kullanılarak faktör analizi uygulanmış ardından korelasyon ve regresyon analizi ile hipotezler test edilmiştir. Yapılan analizler sonucunda, çalışmaya tutkunluğun iş ve yaşam tatminini etkilediği sonucuna ulaşılmıştır. Bu bağlamda çalışmaya tutkunluğun alt boyutları olan canlılık, adanmışlık ve odaklanma boyutlarından canlılık boyutunun, iş tatmini üzerinde anlamlı bir etkisi görülmezken, adanmışlık ve odaklanma boyutlarının pozitif yönde anlamlı bir etkisi olduğu görülmektedir. Çalışmaya tutkunluğun alt boyutları ve yaşam tatmini üzerine etkisi incelendiğinde ise, odaklanma boyutunun yaşam tatmini üzerinde anlamlı bir etkisi görülmezken, canlılık ve adanmışlık boyutlarının pozitif yönde anlamlı bir etkisi olduğu görülmektedir. Ayrıca iş ve yaşam tatmini arasında da pozitif yönde anlamlı bir ilişki olduğu tespit edilmiştir.
Multilevel Identification Sources as Predictors of Deviant Workplace Behaviors
Authors: Aydın Esra , Basım Nejat
Published: September 2021

The purpose of the study is to explore the effects of multilevel identification sources on negative and positive deviant workplace behavior within the theoretical framework of social exchange and social identity theories. Data were collected from a survey of 425 participants working in different sectors in Turkey. Structural equation modeling was used to test the research model. Results showed that organizational identification is negatively associated with negative deviant workplace behavior and positively associated with positive deviant workplace behavior. In addition, it was found that organizational identification is more related to the organizational dimension of negative and positive deviant workplace behavior; on the other hand, relational identification is more related to the interpersonal dimension of negative and positive deviant workplace behavior within the target similarity model. However, no significant relationship between occupational identification and negative deviant workplace behavior was found.
İş Zanaatkârlılığının Bağlamsal Performans Üzerindeki Etkisinde Algılanan Aşırı Nitelikliliğin Düzenleyici Etkisi
Authors: Yıldız Bora , Gizlier Ömer , Bekmezci Mustafa
Published: September 2021

Bu çalışmada, iş zanaatkârlılığının bağlamsal performans üzerindeki etkisi ve bu ilişkide aşırı nitelikliliğin düzenleyici etkisi Kişi-Çevre Uyumu Teorisi kapsamında incelenmiştir. İlgili yazın incelendiğinde, bağlamsal performansın öncüllerini belirlemeye yönelik pek çok araştırma olmasına rağmen, iş zanaatkârlılığının bağlamsal performans üzerindeki etkisi ve bu ilişkide aşırı niteliklilik algısı gibi durumsal faktörlerin nasıl rol oynadığı hala belirsizdir. Bu bağlamda bu araştırmanın amacı iş zanaatkârlılığının bağlamsal performans üzerindeki etkisini ve algılananın aşırı nitelikliliğin bu ilişki üzerindeki durumsal etkisini incelemektir. Araştırma 2017 yılının ikinci çeyreğinde İstanbul’da kolayda örnekleme yöntemi ve anket tekniğiyle ulaşılan 232 beyaz yakalı kamu ve özel sektör çalışanı üzerinde uygulanmıştır. Toplanan veriler SPSS programı kullanılarak nicel analiz yöntemleri ile analiz edilmiştir. Elde dilen bulgular iş zanaatkârlılığının bağlamsal performansın istatistiksel açıdan anlamlı ve pozitif bir yordayıcısı olduğunu göstermiştir. Buna ek olarak algılanan aşırı nitelikliliğin bu ilişki üzerindeki düzenleyici etkisi istatistiksel açıdan anlamlıdır. Araştırma sonucunda yöneticiler ve uygulayıcılar için çeşitli öneriler sunulmuştur.
İş Biçimlendirme (Job Crafting) Ölçeği’nin Türkçeye Uyarlanması
Authors: Çetin Fatih , Güner Gamze , Basım Nejat
Published: September 2021

Bu çalışmanın amacı, iş talepleri kaynakları modeli çerçevesinde Tims, Bakke & Derks (2012) tarafından geliştirilen İş Biçimlendirme (Job Crafting) Ölçeği’nin Türkçeye çeviri ve uyarlamasını yapmaktır. İş biçimlendirme bu anlayışla; yapısal iş kaynaklarını artırma, engelleyici iş taleplerini azaltma, sosyal iş kaynaklarını artırma ve zorlu iş taleplerini artırma olmak üzere dört boyutla ölçülmektedir. Araştırmanın örneklemi 371 çalışandan anket yöntemiyle toplanan verilerden oluşmaktadır. Ölçek varyans yapısı ve kovaryans ilişkileri dikkate alınarak yapı geçerliliği ve eş zaman geçerliliğiyle test edilmiştir. Güvenilirlik için soruların iç tutarlılık testleri yapılmış ayrıca ölçeğin cinsiyet açısından farksızlığı hesaplanmıştır. Yapılan tüm analizler sonucunda ölçeğin geçerli ve güvenilir olduğuna ilişkin yeterli kanıtlara ulaşılmıştır.
Effect of Gust Wind on Flow over a Wall-Mounted Fence
Authors: Bhamitipadi Suresh Dhanush , Aju Emmanuvel Joseph , Zaksek Matthew John , Leffingwell Melissa Marie , Jin Yaqing
Published: September 2021

In this work, the characteristics of incoming and wake flows downstream of wall-mounted fences under wind gust were explored with wind tunnel experiments. A time-resolved particle image velocimetry was used to capture the flow dynamics across two different fence heights. The results show that during the gust period, the wake presents distinct meandering and strong flow mixing. The Probability Density Function distribution of flow velocities indicates that the mixing effect increases with the streamwise distances. Specifically, for locations above the fence top tip, the growth of streamwise distance decreases the footprint of wind gust. However, for locations lower than the fence top tip, the local wind flows exhibit stronger variations before and after wind gust with the growth of downstream distance. Overall, at the same relative streamwise and spanwise locations downstream of fences within the wake region, the higher fence better suppresses the influence of gust wind.
Simultaneous Particle Tracking and Temperature Measurements during Additive Manufacturing using a High-speed Spectral Plenoptic Camera
Authors: Kelly Dustin , Fischer Ralf , Goldman Ari , Morris Sarah , Prorok Bart , Thurow Brian
Published: September 2021

In this work, a high-speed spectral plenoptic camera was used for three-dimensional (3D) simultaneous particle tracking and pyrometry measurements of hot spatter particles ejected during the metal additive manufacturing process. Additive manufacturing (AM) has an increasing role in the aerospace, energy, medical and automotive industry (DebRoy et al., 2018). While this new technology enables the production of highly advanced parts, research on the fundamental mechanisms governing the laser-matter interactions are an ongoing challenge because of the spatial and temporal resolution inherent to the AM process. One challenge is the characterization of spatter particles ejected from the melt pool, as these particles can be incorporated into the final part affecting the mechanical properties (Deng et al., 2020). One potential solution for simultaneously measuring velocity and temperature of the spatter particles is the spectral plenoptic camera.
Stereo PIV measurements of oscillatory plasma forcing in the cross-plane of a channel flow
Authors: Hehner Marc T. , Von Deyn Lars H. , Serpieri Jacopo , Pasch Saskia , Reinheimer Timo , Gatti Davide , Frohnapfel Bettina , Kriegseis Jochen
Published: September 2021

The present work describes an experimental investigation that applies stereo particle image velocimetry in a cross-plane of a turbulent channel flow that is additionally perturbed by spanwise oscillatory body forces, induced by a plasma actuator and designed to mimic the effect of spanwise wall oscillations. The experiment is aimed at retrieving the forcing-correlated scales and the turbulent flow stochastic fluctuations for the measured cross-plane. The first are macroscopic scales and require a larger investigation domain while the latter benefit of a higher resolution. Furthermore, the extended flow-field dynamic range posed a challenge on the experiment design, finally leading to an optimal tradeoff. The results of the unactuated flow compare well to the direct numerical simulations of Hoyas and Jimenez ́ (2008), while the actuated case demonstrates strong near-wall momentum addition and spanwise modulation of the streamwise flow component.
First challenge on Lagrangian Particle Tracking and Data Assimilation: datasets description and planned evolution to an open online benchmark
Authors: Leclaire Benjamin , Mary Ivan , Liauzun Cédric , Péron Stéphanie , Sciacchitano Andrea , Schröder Andreas , Cornic Philippe , Champagnat Frédéric
Published: September 2021

In the last decade, Lagrangian Particle Tracking (LPT) has emerged as one of the leading measurement techniques for the quantitative determination of fluid flows in three-dimensional domains (see e.g. Schanz et al., 2016), due to its accuracy in reconstructing particles velocities and material accelerations. Due to the scattered nature of the obtained result, at the particles positions only, significant research efforts have also been placed in the development of dedicated Data Assimilation (DA) techniques, aiming at finally reconstructing full 3D velocity and pressure fields on regular Cartesian grids (see, e.g., Schneiders et al. 2016).
Enhanced data assimilation of 4D LPT with physics informed neural networks
Authors: Han Jeongmin , Kim Dong , Shin Hyungmin , Kim Kyung Chun
Published: September 2021

According to recent trend of explosive growth of computation power and accumulated data, demand for the deep learning application in various research fields is increasing. As following this trend, remarkable achievements are presented in the experimental fluid mechanics field. One of the most outstanding research is Physics Informed Neural Networks (PINN) Raissi et al. (2020). Physical knowledge, which has been accumulated by humans, is imposed on the neural networks. PINN was used the automatic differentiation for implementing the governing equations as a physical constraint. By utilizing this concept, physical constraints make neural networks finding physical meaning of phenomena instead of simply fitting to the label data.
Using differential phase for 3D localization of tracer particles in digital inline holographic microscopy PIV/PTV (DIHM-PIV/PTV)
Authors: Ahmed Asif , Sun Bihai , Cadarso Victor J. , Soria Julio
Published: September 2021

Digital inline holographic microscopy PIV/PTV (DIHM-PIV/PTV) has the ability to provide 4-dimensional (4D), i.e. time-resolved, 3-component 3-dimensional (3C-3D) flow measurement with high spatial and temporal resolution, compact optical setup and minimal calibration Sun et al. (2020) compared to most other volumetric techniques such as tomo-PIV, defocusing PIV, etc. Despite all these advantages DIHMPIV/PTV has not yet developed into a standard laboratory tool due to some major limitations such as the extended depth-of-focus (DOF) problem and the virtual image effect which cause artefacts in the standard reconstruction volume limiting the seeding concentration and thus the achievable velocity spatial resolution. In order to mitigate the above-mentioned limitations we present a novel particle localization and extraction methodology which allows the minimization of these artefacts from the standard reconstruction and perform PIV/PTV analysis on the particle volume fields only. The proposed algorithm is based on the differential phase, which is the axial phase shift of the object wave compared to the reference plane wave propagation.
LaPIV using multigrid warping and proxy regularization
Authors: Yang Yin , Heitz Dominique
Published: September 2021

The Lagrangian Particle Image Velocimetry (LAPIV) method was firstly proposed in Yang et al. (2019) as a prototype approach to achieve the goal of accurate and efficient reconstruction of 3D Eulerian velocity field of fluid flow from multi-view particle images. After validating against synthetic datasets, the prototype has already shown significant advantages in revealing more small scale flow structures than other stateof-the-art Eulerian velocity estimation methods, such as TomoPIV (Scarano, 2013) and VIC# (Jeon et al., 2019). However, at this early stage, LAPIV can not be easily applied to other datasets. In the current work, we focus on extending LAPIV to operational search by incorporating several essential and wellestablished paradigms: multi-resolution, warping, and proxy regularization. Recent approaches, Lasinger et al. (2019) and Cornic et al. (2020), function in the same vein as LAPIV, aiming at reconstructs the dense Eulerian volumetric flow directly from multi-view particle-seeded images Another pipeline consists of firstly reconstructing the Lagrangian flow using the Lagrangian Particle Tracking (LPT), then optimally interpolating the Lagrangian flow to Eulerian grids, taking into account the Eulerian dynamics constraints as in Flowfit (Gesemann, 2020) and VIC# (Jeon et al., 2019). If Eulerian flow is required, LAPIV is the preferred approach due to its simplicity and ability to utilize the original rich image features.
Uncertainty propagation and truncation errors in LPT kinematics
Authors: Chatellier Ludovic
Published: September 2021

Lagrangian Particle Tracking (LPT) has become a near-standard approach for performing accurate 3D flow measurements, thanks notably to the technical breakthroughs brought by the Iterative Particle Reconstruction (IPR: Wieneke, 2013) and Shake-the-Box (STB: Schanz et.al, 2016) procedures. These decisive progresses have triggered a number of studies relative to the eduction of flow kinematics and dynamics based on particle trajectory analyses. Novara & Scarano (2013), and others, focused on polynomial approximations of the trajectories, which analytically provide the material derivatives used to estimate pressure gradients. In particular, approximations based on second order polynomials fits of a small number of particle positions are used in commercially available softwares and among research teams as a straightforward solution to obtain the first and second order derivatives with a limited effect of the measurement noise. Additionally the analyses conducted during the 2020 LPT challenge (Leclaire, 2020 ; Sciacchitano, 2020) have addressed the performance of methodologies used by different groups with respect to second order trajectory fits for both multi-pulse and four-pulse (Novara et. al, 2016) LPT cases. On more advanced theoretical grounds, Geseman et. al (2016) have proposed the trackfit approach using penalized B-splines with considerations on the time-varying acceleration rate (i.e. jolt or jerk) and spectral content of noisy particle tracks
Experimentally obtained velocity and pressure fields of an open channel flow around a cylinder using RIM-SPIV
Authors: Reeder William Jeffery , Moreto Jose Roberto , Liu Xiaofeng , Tonina Daniele
Published: September 2021

The quantification of velocity and pressure fields over streambeds is important for predicting sediment mobility and water exchange between stream and sediment interstitial spaces (Schmeeckle and Nelson, 2003; Tonina and Buffington, 2009). The latter is typically referred as hyporheic flow, which consists of surface water that flows through the streambed sediment pores (Tonina and Buffington, 2009). These fluxes are mainly driven by pressure gradients at the water sediment interface. In this paper, we report an experimental investigation of the time-averaged velocity and pressure field, quantified in a set of laboratory experiments using stereo PIV (Particle Image Velocimetry) with a non-toxic index-matched fluid, for an open channel flow around a barely submerged vertical cylinder as a model for plant stalk over a plane bed of coarse granular sediment, mimicking a stream gravel bed. This is the first time that such a velocity and pressure field is characterized experimentally for a free surface flow with irregular floor contour.
TrackAER: Real-Time Event-Based Particle Tracking
Authors: Rusch Alexander , Roesgen Thomas
Published: September 2021

Event-based cameras (Lichtsteiner et al., 2008; Posch et al., 2010; Gallego et al., 2020) operate fundamentally different from frame-based cameras: Each pixel of the sensor array reacts asynchronously to relative brightness changes creating a sequential stream of events in address-event representation (AER). Each event is defined by a microsecond-accurate time stamp, the pixel position and a binary polarity indicating a relative increase or decrease of light intensity. Thus, event-based cameras only sense changes in a scenery while effectively suppressing static, redundant information. This renders the camera technology promising also for flow diagnostics. In established approaches like PIV or PTV vast amounts of data are generated, only for a large part of redundant information to be eliminated in data post-processing. In contrast, eventbased cameras effectively compress the data stream already at the source. To make full use of this potential, new data processing algorithms are needed since event-based cameras do not generate conventional framebased data. This work utilizes an event-based camera to identify and track flow tracers such as helium-filled soap bubbles (HFSBs) with real-time visual feedback in measurement volumes of the order of several cubic meters.
Main results of the first Lagrangian Particle Tracking Challenge
Authors: Sciacchitano Andrea , Leclaire Benjamin , Schroeder Andreas
Published: September 2021

This work presents the main results of the first Lagrangian Particle Tracking challenge, conducted within the framework of the European Union’s Horizon 2020 project HOMER (Holistic Optical Metrology for Aero-Elastic Research), grant agreement number 769237. The challenge, jointly organised by the research groups of DLR, ONERA and TU Delft, considered a synthetic experiment reproducing the wall-bounded flow in the wake of a cylinder which was simulated by LES. The participants received the calibration images and sets of particle images acquired by four virtual cameras, and were asked to produce as output the particles positions, velocities and accelerations (when possible) at a specific time instant. Four different image acquisition strategies were addressed, namely two-pulse (TP), four-pulse (FP) and time-resolved (TR) acquisitions, each with varying tracer particle concentrations (or number of particles per pixel, ppp). The participants’ outputs were analysed in terms of percentages of correctly reconstructed particles, missed particles, ghost particles, correct tracks and wrong tracks, as well as in terms of position, velocity and acceleration errors, along with their distributions. The analysis of the results showed that the best-performing algorithms allow for a correct reconstruction of more than 99% of the tracer particles with positional errors below 0.1 pixels even at ppp values exceeding 0.15, whereas other algorithms are more prone to the presence of ghost particles already for ppp < 0.1. While the velocity errors remained contained within a small percentage of the bulk velocity, acceleration errors as large as 50% of the actual acceleration magnitude were retrieved.