Relevant bibliographies by topics / Tightness test

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Tightness test'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Tightness test"

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Zhang, Tao Tao, and Fei Wang. "The Air Tightness Test Method of the High Speed Train." Applied Mechanics and Materials 229-231 (November 2012): 482–86. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.482.

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The tightness of interior space in condition of a high speed train with its side door, side window closed called train air-tightness. The paper introduces the air tightness of the high speed train and the basic methods for air tightness testing. It also applies a constant pressure leak model to test and points out that the importance of air tightness for high speed train.
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Agnihotri, Dhara Santosh, Anjali R. Bhise, and Krutarth Purnendu Shah. "Validity & Reliability of Vonfidans (Het’s Device to Instantly Test Vaginal Tightness) to Test the Vaginal Tightness." Galore International Journal of Health Sciences and Research 8, no. 4 (2023): 23–30. http://dx.doi.org/10.52403/gijhsr.20230403.

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Vaginal laxity is a very common issue faced by many females. Looseness in the vagina is explained as laxity. Vaginal laxity can result into pelvic floor dysfunctions like urine leakage, pelvic organ prolapse, sexual dysfunction, reduced vaginal sensations, low back pain etc. Pregnancy and childbirth can be considered as the most common cause for developing vaginal laxity. In spite being so common condition, vaginal laxity is very less discussed and reported issue. By far there is no tool to test the vaginal tightness (strength of pelvic floor muscles). This study was aimed to measure the valid
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Narkhede, Devesh, Mayur Ajmera, and Quazi Ibtesaam Huma. "Prevalence of Hamstring Tightness in Nursing Students Using 90-90 SLR Test: A Cross-Sectional Study." International Journal of Physiotherapy and Research 12, no. 3 (2024): 4738–42. http://dx.doi.org/10.16965/ijpr.2024.117.

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Background: Flexibility is a range of movement available at a joint. Tightness of muscle is caused by a decline in the ability of muscle to disfigure. Hamstring tightness can lead to low back pain, bad posture, imbalances of muscles and knee pain. According to previously performed studies, prolonged sitting can be a factor that leads to hamstring tightness; therefore, we selected nursing students as a participant in the study who have a daily sitting time of 6-8 hours. Hence objective of the study is to find out the prevalence of hamstring tightness among nursing students. Aim: The study's aim
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Deshmukh, Aishwarya, Archana Nagargoje, and Abhijit Diwate. "PREVALENCE OF HAMSTRING AND ILIOTIBIAL BAND TIGHTNESS IN NONSPECIFIC LOW BACK PAIN PATIENTS." VIMS JOURNAL OF PHYSICAL THERAPY 2, no. 1 (2020): 28–32. http://dx.doi.org/10.46858/vimsjpt.2106.

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Background- An observational study was conducted on 60 college going students experiencing nonspecific low back pain of mild to moderate range[ on VAS 2-5]. METHOD- Assessment of hamstring and IT band tightness was done by using 90-90 hamstring test and Ober’s test respectively. Participant were checked for tightness and marked whether tightness present or not RESULT- Analysis of outcomes was done by the mean and standard deviation. The result showed that, 58.33% male and 95.85% has female has hamstring muscle tightness. 16.66% Male and 22.91% female has of IT band tightness. 85% population [b
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Wiyanto, Nihla Vadia Haya, Achmad Fariz, Puspo Wardoyo, and Angria Pradita. "LATIHAN NORDIC HAMSTRING CURLS PADA PASIEN ATLET SEPAK BOLA DENGAN GANGGUAN HAMSTRING TIGHTNESS DI POLI REHABILITASI MEDIK RSU UNIVERSITAS MUHAMMADIYAH MALANG." Jurnal Ilmiah Keperawatan (Scientific Journal of Nursing) 10, no. 1 (2024): 102–8. http://dx.doi.org/10.33023/jikep.v10i1.1884.

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Pendahuluan: Keluhan yang paling sering terjadi pada atlet sepak bola adalah hamstring tightness. Hamstring tightness merupakan suatu kondisi dimana otot Hamstring mengalami penurunan fleksibilitas dan elastisitas sehingga cenderung memendek untuk sementara waktu. Sebenarnya kondisi ini bukanlah penyakit, namun dapat sangat mengganggu aktivitas sehari-hari. Hamstring tightness merupakan suatu sinyal bahwa otot sudah terlalu banyak digunakan. Pada umumnya Hamstring tightness disebabkan oleh olahraga atau aktivitas fisik lainnya yang dilakukan secara intens. Tujuan : Penelitian ini bertujuan unt
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Tariq, Zaina, Hamna Zahoor, Rahat Ayub, Anam Abbas, Rahat Afzal, and Wadha Ijaz Kamran. "Association of Isolated Gastrocnemius Tightness in Patients with Heel Pain." Journal of Health and Rehabilitation Research 4, no. 1 (2024): 734–38. http://dx.doi.org/10.61919/jhrr.v4i1.484.

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Background: Heel pain is a common musculoskeletal complaint among adults, significantly impacting quality of life. Recent studies suggest a strong association between isolated gastrocnemius tightness and heel pain, although comprehensive research in diverse populations remains scarce. Understanding the relationship between gastrocnemius tightness and heel pain is crucial for developing effective treatment strategies. Objective: This study aimed to investigate the association of isolated gastrocnemius tightness with heel pain in a Pakistani adult population, focusing on the prevalence of gastro
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Panchal, Shruti, Dharaben Patel, Ambica Mall, and Threety Pruchhak. "Effects of Sub-Occipital Muscles Inhibition and Self Stretch on Calf and Hamstring Muscle Tightness: One Time Comparative Study." Parul University Journal of Health Sciences and Research 2, no. 2 (2024): 14–22. http://dx.doi.org/10.62373/pujhsr.2023.122.

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Background: Muscle tightness is the most limiting factor for restricted ROM and decreased joint flexibility. Hamstring and calf muscles are more prone to getting tight, which causes musculoskeletal problems. This study focused on checking the effects of various therapeutic techniques, including the sub-occipital muscle inhibition technique and self-stretching technique, on hamstring and calf muscle flexibility in subjects with tight muscle groups. Objectives: To determine the effects of sub-occipital muscle inhibition and self-stretch on calf and hamstring muscle tightness. Methodology: A tota
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Muhammad, Atta, Muhammad Rizwan Rana, Tooba Amin, Christina Angela, Felicianus Anthony Pereira, and Mazhar Ali Bhutto. "Prevalence of Piriformis Muscle Tightness among Undergraduate Medical Students." Pakistan Journal of Medical and Health Sciences 16, no. 2 (2022): 964–66. http://dx.doi.org/10.53350/pjmhs22162964.

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Objectives: To determine the prevalence of piriformis muscle tightness among allied health students, and its relationship with age, gender and year of study. Methods: A cross sectional study was conducted. A sample size of 259 was calculated using Open Epi v3.01. Allied health students from physical therapy, occupational therapy and prosthetics & orthotics programs participated in this study, which lasted 4 months. After obtaining informed consent, data was collected through a self-developed questionnaire. Piriformis muscle tightness, and symptom recurrence, was determined using the FAIR t
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Smith, Peter B. "Cultural Values Versus Cultural Norms as Predictors of Differences in Helping Behaviors and in Emotion Regulation: A Preliminary Nation-Level Test Related to the Leung-Morris Model." Management and Organization Review 13, no. 4 (2017): 739–66. http://dx.doi.org/10.1017/mor.2017.51.

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ABSTRACTLeung and Morris (2015) propose conditions under which values, norms, and schemata drive cultural differences in behavior. They build on past theories about dimensions of situational strength to propose that personal values drive behavior more in weak situations and perceived norms drive behavior more in strong situations. Drawing on this analysis as well as two recent models of cultural tightness-looseness, country-level effects are predicted on the assumption that tighter cultures more frequently create strong situations and looser cultures more frequently create weak situations. Usi
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Khalil, Elaaf, Ruhma Tariq, Hafiz Muhammad Arsalan, Amna Khalid, Sultan Ayaz, and Hassan Javed. "Prevalence of hamstrings tightness and its impact on lower extremity function in asymptomatic individuals with prolonged standing hours Authors." International Journal of Natural Medicine and Health Sciences 1, no. 4 (2022): 27–30. http://dx.doi.org/10.52461/ijnms.v1i4.1040.

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Background: Hamstrings undergo adaptive shortening. It is common in healthy individuals to have a sedentary lifestyle affecting males (91.8%) more than females (78.7%). Hamstring tightness can interrupt ADL’s predisposing the person to further health problems i.e. plantar fasciitis, sacroiliac joint pain, decreased lumbar lordosis, knee pain, quadriceps malfunction, postural disturbances, overstretched lumbar ligaments, reduced muscle strength. Aims and Objectives: To analyze the prevalence of hamstring tightness and its effects on lower extremity function in individuals with prolonged standin
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Dissertations / Theses on the topic "Tightness test"

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Réveillère, Arnaud. "The development of the concern for tightness in the salt cavern industries, of accurate tightness test techniques and of the concept of Mechanical Integrity Tes." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS564.

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Les cavités salines ont été initialement un sous-produit de l'extraction industrielle de sel. Dans les années 40, elles ont commencé à être utilisées pour y stocker des hydrocarbures. Il y a aujourd'hui 2000 cavités salines dans le monde stockant des fluides liquides, gazeux ou supercritiques. La nécessité de tester l'étanchéité des cavités de stockage est venue avec leur développement. Une grande diversité de techniques a été proposée, variant dans le temps, selon les sociétés et les pays. Par ailleurs, plusieurs critères d'acceptation de ces tests ont été, et sont encore, utilisés. Si les pr
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Šťastný, Daniel. "Zkouška těsnosti vysokotlaké části čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230967.

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This essay discusses actual situation and method for high pressure pump part testing. Here are possibilities for moving of high pressure leakage test on test benches used for pump functional test. Savings and costs plus return on investment are calculated for testing process change.
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Vašek, Richard. "Návrh zařízení pro zkoušení těsnosti plastových přírub." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230893.

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The main diploma thesis‘s target is to propose applicable industrial method for the industrial leak testing with high definition. The result is to compare available methods and to propose the suitable one. The final target of the diploma thesis is definition of the defined method that will be able to detect leaks required by customer and fulfil internal requirements of the Robert Bosch ltd. Company.
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Kermes, Adam. "Vliv volby vstupních parametrů zařízení Blowerdoor testu na výslednou hodnotu průvzdušnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225752.

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The thesis examines the influence of choice of input parameters Blowerdoor test equipment on the final value of air permeability. Measurements have been performed on a set of four experimental buildings and one room.
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Julinová, Patricie. "Návrh opatření pro snížení energetické náročnosti prodejny potravin." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240210.

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The master thesis deals with measures to reduce energy performance of grocery store building. Model of the grocery store is evaluated according to a recommended energy values specified by Czech standards and according to the real values of the actual consumption. These values are compared. Final building analysis for a proposal measures to reduce energy consumption is based on the invoices of the real consumption and on the experimental assignments. Experimental measurements are the Blower door test of the tightness of the building envelope, the measures with the thermovision camera and the me
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Lima, Andreia Bastos Pires de. "Study of the tightness of the metallization used on top of a thin film capacitor cell." Master's thesis, 2015. http://hdl.handle.net/1822/39556.

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Dissertação de mestrado integrado em Engenharia de Materiais<br>Vishay Intertechnology Inc. is a worldwide company in electronic components sector. It is a manufacturer of discrete semiconductors and passive electronic components. Vishay Electrónica Portugal Lda in Vila Nova de Famalicão produces film capacitors, which are the main focus of this work. Film capacitors are applied on several electronic equipments and the reliability of the capacitors has a major impact on the operational reliability and maintenance costs of the whole system. To test the capacitors reliability it is used bia
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Books on the topic "Tightness test"

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Hebestreit, Helge, Susi Kriemler, and Thomas Radtke. Exercise, physical activity, and asthma. Edited by Neil Armstrong and Willem van Mechelen. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198757672.003.0024.

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The incidence of asthma in children varies among countries and can be estimated to range between 5% and 20%. Exercise-induced asthma (EIA) is common in patients with asthma but can also occur in some children without asthma. Typical symptoms of EIA include cough, chest tightness, and shortness of breath shortly after exercise. The pathophysiology of EIA is not completely understood, but it has been shown that airway cooling and drying with increased ventilation during exercise and airway re-warming after exercise play a pivotal role. In addition, a lack of physical activity may also contribute
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Tarsia, Paolo. Dyspnoea in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0083.

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Dyspnoea may be defined as a subjective experience of discomfort associated with breathing. Breathing discomfort arises as a result of complex interactions between signals relayed from the upper airways, the chest wall, the lungs, and the central nervous system. Integration of this information with higher brain centres provides further processing. The final aspects of the sensation of dyspnoea are influenced by contextual, environmental, behavioural, and cognitive factors. At least three qualitatively distinct sensations have been employed to describe discomfort in breathing—air hunger, increa
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Buchanan, Elaine, and Chris Lavy. Low back pain. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0064.

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Low back pain (LBP) is pain arising from the structures of the lumbar spine, including joints, discs, connective tissue, and nerves. Symptoms include pain and, muscle tightness or stiffness, with or without referral of pain to the legs. Most (95%) of LBP is managed in primary care; the rest is managed in secondary care. LBP affects nearly everyone at some point in their life and has an annual prevalence of around 40%. It is less common in children but from age 16 onwards the point prevalence for all age groups is around 25%. Many experience milder persisting symptoms interspersed with exacerba
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Kelly, Evelyn B. What You Need to Know about Asthma. ABC-CLIO, LLC, 2022. http://dx.doi.org/10.5040/9798216034735.

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While some individuals with asthma consider the condition only a minor nuisance, for others it significantly interferes with daily activities and may even be life-threatening. This book offers readers a broad introduction to this common respiratory issue. Asthma is a respiratory condition marked by spasms, swelling, and excess mucus production in the bronchial passages of the lungs. This triggers coughing, wheezing, chest tightness, and shortness of breath. While asthma can usually be managed with medications and avoidance of certain triggers, it's a serious—potentially deadly—chronic disease.
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Book chapters on the topic "Tightness test"

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Aoki, Kenji. "Air-tightness Test." In Storage of LPG in Large Rock Caverns. CRC Press, 2023. http://dx.doi.org/10.1201/9780367822163-6.

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Chen, JiaZhao, WenTao Yu, and Liang Qi. "A Method to Raise Test Efficiency of SRM Gas-Tightness." In Advances in Intelligent and Soft Computing. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25986-9_75.

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Nagy, András. "Strength Test and Dimensioning on Leak Tightness of Flange Joints." In Foundations of Engineering Mechanics. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-31226-7_7.

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Yu, Yang, Min Zhao, and Yongheng Yang. "The Pressure Detection and Control for Gas Tightness Test of Metal Capillary Tube." In Informatics in Control, Automation and Robotics. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25992-0_33.

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Liu, Heng, Weiwen Xu, Hongtao Xu, and Xuemiao Xiang. "Numerical Analysis of Bearing Capacity of Basic Stress Unit Frame of Socket-Type Wheel Buckle Formwork Support Frame Body." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_12.

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AbstractSocket-and-socket wheel-buckle steel pipe formwork support frame is a new formwork support system, with fixed component specifications and fast erection speed, which can significantly improve the construction efficiency. Its application performance is different from that of fastener-type, bowl-buckle-type and plate-buckle-type, and there are not enough experimental and numerical analysis results to consult. Therefore, based on the bearing capacity test of the basic bearing units of socket-type wheel-buckle steel pipe formwork support, the finite element software ANSYS is used to conduc
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Klotzbach, Annett, Mosarouf Hossain, Dieter Luong, and Philipp Götze. "Fabrication of Media-Tight Connections Between Metal and Plastics Using HyJOIN® Technology." In Zukunftstechnologien für den multifunktionalen Leichtbau. Springer Fachmedien Wiesbaden, 2024. https://doi.org/10.1007/978-3-658-45889-8_3.

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AbstractThermal direct joining with hyJOIN® enables quick and reliable connections between metal and plastics without any additional material like screws, rivets or adhesives. Due to its reversibility, it facilitates the implementation of new repair and recycling strategies while at the same time minimizing the consumption of resources.During joining the parts are pressed together. At the same time, electromagnetically induced eddy currents heat the metal. The plastics softens in the contact area and binds to the metal surface during cooling. As plastics often adhere poorly to metal, the surfa
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Cosaert, Annelies, Geert Bauwens, and Estelle De Bruyn. "Enhance Performance and Reduce Energy Use in Storage Areas: Two Belgian Case Studies." In Springer Proceedings in Archaeology and Heritage. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-85655-6_17.

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Abstract Resilient Storage is a project that focuses on designing a protocol for Belgian museums to implement short term energy-savings strategies, decrease CO2 emissions and improve preservation conditions. Cultural institutions’ mandate to optimally preserve their collections often encourages them to invest in Heating, Ventilation and Air-Conditioning (HVAC) systems to strictly control the indoor climate in their collection storage. These HVAC systems induce high operating costs and energy use. Today’s context calls for a combined strategy, one that reduces an institution’s environmental imp
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Vignaud, J.-C., P. Digat, and H. Nowak. "Water And Steam Tightness Tests of Expanded Graphite Static Gaskets for Nuclear Power Plant Steam Generators." In Fluid Sealing. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2412-6_10.

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Laudner, Kevin. "What Are the Best Clinical Tests for Measuring Posterior Shoulder Tightness, and How Should Results Be Used to Make Treatment Decisions?" In Quick Questions in the Shoulder. Routledge, 2024. http://dx.doi.org/10.4324/9781003526148-11.

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Perlongo, Alessandro, Nicolas Goujard, Mahsa Mozayan, and Farid Benboudjema. "Development of a Thermo-Hydro-Mechanical Model of the Containment Vessel Vercors to Study Its Aging and Leak Tightness, Based on Specimen Tests and In Situ Measurements." In RILEM Bookseries. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07746-3_29.

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Conference papers on the topic "Tightness test"

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Milewski, Peter, Mark Kuschel, Jens Lander, Karsten Pohlink, and Berthold Suermann. "Verification of various gas-tightness test methods for zero emission transmission products with clean air gas insulation." In 2024 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2024. http://dx.doi.org/10.1109/ichve61955.2024.10676238.

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Mitchell, W. A., G. A. Small, M. A. Reinsalu, Grace Dearborn, and D. O. Veil. "The Use of Novel Monitoring and Control Technology in Cooling Water Systems to Lower Operating Costs." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95263.

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Abstract Cooling water treatment control is accomplished by a number of methods, including mass balance, timer control and control by measurement of an inert component of the cooling water product. A new on-line analyzer achieves product control by measurement of active treatment chemistry. The new analyzer utilizes an on-line ultraviolet-visible spectrophotometer containing no moving parts. Coupled with a chemometrics software package, the instrumentation accurately predicts active product chemistry. Data from frequent determinations of active product level is processed to control product che
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Buchheim, Gerrit M., and David E. Moore. "Failures with Duplex Stainless Steels (DSS) in Hydroprocessing REACs- Update on Latest API Survey." In MECC 2023. AMPP, 2023. https://doi.org/10.5006/mecc2023-20094.

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Abstract Although Duplex Stainless Steel (DSS) Reactor Effluent Air Coolers (REACs) have in some cases been successfully in service for more than 30 years, several cracking failures of DSS REACs and associated piping have occurred, with many cases reported starting in about 2000. Most failures reported have been due to SSC that initiated at high ferrite regions associated with welds. A method for assessing the risk of SSC in DSS REACs has been presented in this paper. It requires consideration of the effectiveness of ferrite control during fabrication, operating environmental severity and in-s
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Bazergui, Andre, Luc Marchand, and James R. Payne. "The Aged Hot Tightness Test for Gaskets." In SAE International Congress and Exposition. SAE International, 1989. http://dx.doi.org/10.4271/890273.

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Schaaf, Manfred, Thomas Klenk, Ralf Vogel, and Jaroslav Bartonicek. "Tightness Characteristics of Packings." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71471.

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The demands on industry to reduce fugitive emissions are increasing, steadily /1/, /2/. On this background it is necessary to improve function and tightness of tightening joints like flanged joints and stuffing box packings. Function and tightness can only be guaranteed if the entire chain of parameters involved is taken in to account (design criteria, gasket factors, calculation, mounting procedure). On the field of flanged joints there are standardization projects on the way that address the topics of the new regulatory demands. Only few work is done regarding stuffing box packings, however.
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Zhao, Xueqian, and Zhonghai Lu. "Empowering study of delay bound tightness with simulated annealing." In Design Automation and Test in Europe. IEEE Conference Publications, 2014. http://dx.doi.org/10.7873/date.2014.263.

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Zhao, Xueqian, and Zhonghai Lu. "Empowering study of delay bound tightness with simulated annealing." In Design Automation and Test in Europe. IEEE Conference Publications, 2014. http://dx.doi.org/10.7873/date2014.263.

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Kobayashi, Takashi, Kiichi Masui, Kengou Nishiura, and Hideshi Shibata. "Method to Estimate the Bolt Loads to Satisfy Tightness Criteria for Gasketed Bolted Flanged Connections." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25614.

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With the recent increase of a safety and environmental concern, the tightness of gasketed flanged connections becomes an important issue. In estimating the tightness of gasketed flanged connections, the sealing behavior of gaskets must be known. Currently, methods to test the sealing behaviors have been established in the North America, Europe and Japan. However, the relationships between the gasket data and the tightness of gasketed flanged connections have not been examined systematically. This paper consists of two parts: gasket data concerning sealing behavior and tightness of gasketed fla
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Kobayashi, Takashi, Kiichi Masui, and Wong Teck Soon. "The Relationship Between Sealing Behavior of Gaskets and the Leak Tightness of Gasketed Bolted Flanged Connections." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77633.

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With the recent increase of a safety and environmental concern, the tightness of gasketed flanged connections becomes an important issue. In estimating the tightness of gasketed flanged connections, the sealing behavior of gaskets must be known. Currently, methods to test the sealing behaviors have been established in the North America, Europe and Japan. However, the relationships between the gasket data and the tightness of gasketed flanged connections have not been examined systematically. This paper consists of two parts: gasket data concerning sealing behavior and tightness of gasketed fla
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Yan, Feng, Qing Miao, Xiangdong Xue, Yubin Wang, Daquan Li, and Jingnan Zhang. "Research on Leak Test for Long Distance Gas Pipline." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90068.

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The main purpose of pre-service leak test is to prove the tightness of the pipeline system. It plays an important role to guarantee the safety operating of pipeline. However, the duration of leak test is different in different countries. If the duration of tightness test is longer, the tightness level can be sufficiently detected, which is benefit for pipeline safe operating, but the cost and the time of project must be extended; if the duration of tightness test is shorter, the defect of pipeline can not be fully exposed, which may be left hidden trouble for pipeline safe operating. Meanwhile
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