Academic literature on the topic 'Acquired dual sensory loss'
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Journal articles on the topic "Acquired dual sensory loss"
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Hovaldt, Hanna Birkbak, Rikke Lund, Christine Marie Lehane, and Jesper Dammeyer. "Relational strain in close social relations among older adults with dual sensory loss." British Journal of Visual Impairment 37, no. 2 (March 6, 2019): 81–93. http://dx.doi.org/10.1177/0264619619833421.
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Objectives: The loss of both hearing and vision (dual sensory loss) affects communication and potentially challenges the ability to maintain healthy social relations. The aim of this study was to examine the association between severity of sensory loss and relational strain among older adults with acquired dual sensory loss. Method: Data were collected through a national cross-sectional questionnaire survey and an administrative database. A total of 302 individuals with functional dual sensory loss ⩾50 years of age participated (66% response). Relational strain was measured as the perceived experience of excessive demands, worries, and conflicts with children, other relatives, or the personal support worker. Data were analyzed by multivariate logistic regression. Results: No associations between severity of dual sensory loss and excessive demands from or worries for children, other relatives, or personal support workers were found. Participants with total blindness and profound deafness had significantly higher odds for experiencing conflicts with children (odds ratio [OR] = 3.09, 95% confidence interval [CI] = [1.02, 9.38]) and the personal support worker (OR = 4.18, 95% CI = [1.23, 4.28]) compared to participants with residuals of both senses. Discussion: Individuals with total blindness and profound deafness might require special attention in rehabilitation to support them in maintaining healthy social relations.
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Minhas, Renu, Atul Jaiswal, Serena Chan, Jessica Trevisan, Abinethaa Paramasivam, and Roxanna Spruyt-Rocks. "Prevalence of Individuals With Deafblindness and Age-Related Dual-Sensory Loss." Journal of Visual Impairment & Blindness 116, no. 1 (January 2022): 36–47. http://dx.doi.org/10.1177/0145482x211072541.
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Introduction The authors of this paper have compiled a report on the prevalence of deafblindness and dual-sensory loss based on the review of existing estimates. The purpose is to inform readers of the importance of using consistent, well-researched definitions and survey questions in future prevalence studies. Methods Articles were extracted through ProQuest and EBSCOhost, online library databases of Cambrian College and Laurentian University. Keywords search included “deafblindness,” “dual-sensory impairment,” “dual-sensory loss,” “age-related,” “congenital,” “acquired,” and “prevalence.” Additionally, the authors conducted a search with Google for research reports and Google Scholar for other relevant peer-reviewed articles. Results This review provides a current overview of prevalence estimates of deafblindness and age-related dual-sensory loss around the world, examining 19 articles or reports published over the last 20 years (2000–2020) in 18 countries, including the European Union (consisting of 8 countries). In line with the prevalence estimates by the World Federation for the Deafblind global report 2018, the review indicates an estimated 0.2–2% prevalence of dual-sensory impairment and underscores varying ranges of prevalence among populations, studies or countries, age groups, and types of deafblindness. The review highlights that the prevalence of deafblindness or dual-sensory loss was often not comparable across studies, but it is clear that the prevalence of dual-sensory impairment increases with age. The studies varied in methods (e.g., population surveys, cross-sectional, and longitudinal studies). Implication for Practitioners The review provides evidence of varying ranges of prevalence rates. Future prevalence studies may benefit from consistent definitions, standard data-collection tools to do better comparisons across countries, and identify factors that predict higher or lower prevalence rates among populations and age groups.
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Miall, R. Chris, Daria Afanasyeva, Jonathan D. Cole, and Peggy Mason. "The role of somatosensation in automatic visuo-motor control: a comparison of congenital and acquired sensory loss." Experimental Brain Research 239, no. 7 (April 28, 2021): 2043–61. http://dx.doi.org/10.1007/s00221-021-06110-y.
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AbstractStudies of chronically deafferented participants have illuminated how regaining some motor control after adult-onset loss of proprioceptive and touch input depends heavily on cognitive control. In this study we contrasted the performance of one such man, IW, with KS, a woman born without any somatosensory fibres. We postulated that her life-long absence of proprioception and touch might have allowed her to automate some simple visually-guided actions, something IW appears unable to achieve. We tested these two, and two age-matched control groups, on writing and drawing tasks performed with and without an audio-verbal echoing task that added a cognitive demand. In common with other studies of skilled action, the dual task was shown to affect visuo-motor performance in controls, with less well-controlled drawing and writing, evident as increases in path speed and reduction in curvature and trial duration. We found little evidence that IW was able to automate even the simplest drawing tasks and no evidence for automaticity in his writing. In contrast, KS showed a selective increase in speed of signature writing under the dual-task conditions, suggesting some ability to automate her most familiar writing. We also tested tracing of templates under mirror-reversed conditions, a task that imposes a powerful cognitive planning challenge. Both IW and KS showed evidence of a visuo-motor planning conflict, as did the controls, for shapes with sharp corners. Overall, IW was much faster than his controls to complete tracing shapes, consistent with an absence of visuo-proprioceptive conflict, whereas KS was slower than her controls, especially as the corners became sharper. She dramatically improved after a short period of practice while IW did not. We conclude that KS, who developed from birth without proprioception, may have some visually derived control of movement not under cognitive control, something not seen in IW. This allowed her to automate some writing and drawing actions, but impaired her initial attempts at mirror-tracing. In contrast, IW, who lost somatosensation as an adult, cannot automate these visually guided actions.
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Papsin, Blake, and Sharon Cushing. "Cochlear Implants and Children with Vestibular Impairments." Seminars in Hearing 39, no. 03 (July 20, 2018): 305–20. http://dx.doi.org/10.1055/s-0038-1666820.
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AbstractSensorineural hearing loss (SNHL) in children occurs in 1 to 3% of live births and acquired hearing loss can additionally occur. This sensory deficit has far reaching consequences that have been shown to extend beyond speech and language development. Thankfully there are many therapeutic options that exist for these children with the aim of decreasing the morbidity of their hearing impairment. Of late, focus has shifted beyond speech and language outcomes to the overall performance of children with SNHL in real-world environments. To account for their residual deficits in such environments, clinicians must understand the extent of their sensory impairments. SNHL commonly coexists with other sensory deficits such as vestibular loss. Vestibular impairment is exceedingly common in children with SNHL with nearly half of children exhibiting vestibular end-organ dysfunction. These deficits naturally lead to impairments in balance and delay in motor milestones. However, this additional sensory deficit likely leads to further impairment in the performance of these children. This article focuses on the following:1. Defining the coexistence of vestibular impairment in children with SNHL and cochlear implants.2. Describing screening methods aimed at identifying vestibular dysfunction in children with SNHL.3. Understanding the functional implications of this dual-sensory impairment.4. Exploring possible rehabilitative strategies to minimize the impact of vestibular impairment in children with SNHL
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Mao, Axiu, Endai Huang, Haiming Gan, Rebecca S. V. Parkes, Weitao Xu, and Kai Liu. "Cross-Modality Interaction Network for Equine Activity Recognition Using Imbalanced Multi-Modal Data." Sensors 21, no. 17 (August 29, 2021): 5818. http://dx.doi.org/10.3390/s21175818.
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With the recent advances in deep learning, wearable sensors have increasingly been used in automated animal activity recognition. However, there are two major challenges in improving recognition performance—multi-modal feature fusion and imbalanced data modeling. In this study, to improve classification performance for equine activities while tackling these two challenges, we developed a cross-modality interaction network (CMI-Net) involving a dual convolution neural network architecture and a cross-modality interaction module (CMIM). The CMIM adaptively recalibrated the temporal- and axis-wise features in each modality by leveraging multi-modal information to achieve deep intermodality interaction. A class-balanced (CB) focal loss was adopted to supervise the training of CMI-Net to alleviate the class imbalance problem. Motion data was acquired from six neck-attached inertial measurement units from six horses. The CMI-Net was trained and verified with leave-one-out cross-validation. The results demonstrated that our CMI-Net outperformed the existing algorithms with high precision (79.74%), recall (79.57%), F1-score (79.02%), and accuracy (93.37%). The adoption of CB focal loss improved the performance of CMI-Net, with increases of 2.76%, 4.16%, and 3.92% in precision, recall, and F1-score, respectively. In conclusion, CMI-Net and CB focal loss effectively enhanced the equine activity classification performance using imbalanced multi-modal sensor data.
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Dai, Peng, JianPing Wang, Lulu Wu, ShuPing Yan, FengTao Wang, and Linkai Niu. "Defect Diagnosis of Gear-Shaft Bearing System Based on the OWF-TSCNN Composed of Wavelet Time-Frequency Map and FFT Spectrum 1." Shock and Vibration 2022 (March 7, 2022): 1–14. http://dx.doi.org/10.1155/2022/4632540.
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In the defect diagnosis of the gear-shaft-bearing system with compound defects, the generated vibration signals are complicated. In addition, the information acquired by a single sensor is easily affected by uncertain factors, and low diagnostic accuracy is caused when traditional defect diagnosis methods are used, which cannot meet the high-precision diagnosis requirements. Therefore, a method is developed to identify the defect types and defect degrees of the gear-shaft-bearing system efficiently. In this method, the vibration signals are collected using multiple sensors, the dual-tree complex wavelet and the optimal weighting factor (OWF) methods are used for the data layer fusion, and the preprocessing is realized through wavelet transform and FFT. A learning model based on two-stream CNN composed of 1D-CNN and 2D-CNN is established, and the obtained wavelet time-frequency map and FFT spectrum are used as the input. Then, the trained features from the output of the connected layer are classified by the SVM. Compared with the OWF-1DCNN and OWF-2DCNN models, the time consumption of the OWF-TSCNN model is increased by 14.5%–26.6%, and the convergence speed of the network is decreased. However, its accuracy reaches 100% and 99.83% in the training set and test set, and the loss entropy and over-fitting rate are also greatly reduced. The feature extraction ability and generalization ability of the OWF-TSCNN model are increased, reaching 100% diagnosis accuracy on different defect types and defect degrees, which is more suitable for defect diagnosis of the gear-shaft-bearing system.
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Gao, Haoqiang, Qun Yan, Xusheng Liu, Ying Zhang, Yongtao Sun, Qian Ding, Liang Wang, Jinxin Xu, and Hao Yan. "Low-Frequency Bandgaps of the Lightweight Single-Phase Acoustic Metamaterials with Locally Resonant Archimedean Spirals." Materials 15, no. 1 (January 5, 2022): 373. http://dx.doi.org/10.3390/ma15010373.
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In order to achieve the dual needs of single-phase vibration reduction and lightweight, a square honeycomb acoustic metamaterials with local resonant Archimedean spirals (SHAMLRAS) is proposed. The independent geometry parameters of SHAMLRAS structures are acquired by changing the spiral control equation. The mechanism of low-frequency bandgap generation and the directional attenuation mechanism of in-plane elastic waves are both explored through mode shapes, dispersion surfaces, and group velocities. Meanwhile, the effect of the spiral arrangement and the adjustment of the equation parameters on the width and position of the low-frequency bandgap are discussed separately. In addition, a rational period design of the SHAMLRAS plate structure is used to analyze the filtering performance with transmission loss experiments and numerical simulations. The results show that the design of acoustic metamaterials with multiple Archimedean spirals has good local resonance properties, and forms multiple low-frequency bandgaps below 500 Hz by reasonable parameter control. The spectrograms calculated from the excitation and response data of acceleration sensors are found to be in good agreement with the band structure. The work provides effective design ideas and a low-cost solution for low-frequency noise and vibration control in the aeronautic and astronautic industries.
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Carpenter, Chris. "Automated Drilling-Fluids-Measurement Technique Improves Fluid Control, Quality." Journal of Petroleum Technology 73, no. 11 (November 1, 2021): 53–54. http://dx.doi.org/10.2118/1121-0053-jpt.
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 204041, “Automatic Drilling-Fluids Monitoring,” by Knut Taugbøl, SPE, Equinor, and Bengt Sola and Matthew Forshaw, SPE, Baker Hughes, et al., prepared for the 2021 SPE/IADC International Drilling Conference and Exhibition, originally scheduled to be held in Stavanger, 9–11 March. The paper has not been peer reviewed. The complete paper presents new units for automatic drilling-fluids measurements with emphasis on offshore drilling applications. The surveillance of fluid properties and the use of data in an onshore operations center is discussed. The authors present experiences from use of these data in enabling real-time hydraulic measurements and models for automatic drilling control and explain how these advances can improve safety in drilling operations and drilling efficiency. Introduction An operator has worked with different suppliers for several years to find and develop technology for automatic measurements of drilling-fluid properties. In the described study, methods for measuring parameters such as viscosity, fluid loss control, pH, electrical stability, particle-size distribution, and cuttings morphology and mineralogy were all fitted into a flow loop in an onshore test center. These tests, however, were all performed with prototype equipment. Since then, work has continued to optimize equipment for offshore installations, made for operating in harsh environments and requiring limited maintenance to provide continuous and reliable data quality. The fluid-measuring technique presented in this paper is based on rheology measurement through a pipe rheometer and density measurements through a Coriolis meter. This rheometer measures at ambient temperature. Dual DP is the terminology that refers to pressure measurements between two differential pressure sensors. The dual-DP pipe rheometer is set up with high-accuracy pressure transducers to measure pressure loss inside the straight section of the pipe rheometer. By varying the flow rate through pipes of different dimensions, a rheology profile at varying shear rates can be calculated. Field Implementation Installation of a unit begins with a rig survey conducted in concert with the drilling contractor to find the best location and sampling point. Fluid normally is taken from the charge manifold for the mud pumps, ensuring measurement of the fluid going into the well. The first installation in the North Sea of an automatic fluid-monitoring (AFM) unit was in 2017. This unit is still operational, sending data to an onshore support center. Fig. 1 shows such a unit installed offshore. The AFM unit has only one movable part, the monopump supplying drilling fluid through the unit. Once the dual-DP rheometer was factory-acceptance-tested in the yard, it was sent offshore to be commissioned and verified on a fixed installation in the North Sea. The related data presented in the complete paper were acquired in the field while drilling the 355-m, 8½-in. section with 1.35-SG low-equivalent-circulating-density oil-based drilling fluid, with drilling conducted at approximately 4000 m measured depth. The mud engineer onboard was requested to perform rheology checks on a viscometer at equal ambient temperature to the AFM so that the results could be compared; the AFM also measures rheology at ambient temperature.
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Bernstein, Claire Marcus. "Introduction to Dual Sensory Loss Issue." Trends in Amplification 11, no. 4 (December 2007): 217–18. http://dx.doi.org/10.1177/1084713807308343.
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Barreira, Amilton A., and Wilson Marques. "Truncal sensory loss in acquired demyelinating neuropathies." Muscle & Nerve 20, no. 5 (May 1997): 611–13. http://dx.doi.org/10.1002/(sici)1097-4598(199705)20:5<611::aid-mus12>3.0.co;2-z.
Full textDissertations / Theses on the topic "Acquired dual sensory loss"
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Dunsmore, Moira Elizabeth. "An invisible disability: navigating the enduring state of dual sensory impairment (DSI) in older age." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29262.
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Dual sensory impairment (DSI) is a combination of vision and hearing impairment or loss, which varies in severity and is particularly prevalent in older age. DSI is a unique disability that sits at the intersection of ageing and disability, a complex medical issue with profoundly social consequences that has received little attention in health policy or disability research and practice. DSI presents significant challenges to older adults, their families and those with whom they interact, and despite its growing global prevalence, is underexplored in extant literature.
This study uses grounded theory to explore the social meaning and experiences of older adults with DSI and their family carers in Australia. Multiple physical, social and emotional impacts of DSI contribute to reduced social participation and declining availability of social networks. Critically, smaller social networks reduce access to resources and support, with the spouse, or significant other, becoming the main locus of support and, by default, social engagement. Using Charmaz’s constructivist grounded theory methodology, this thesis examines the dyadic, that is, the interrelated, social experiences of two persons in a DSI context, through the narratives of both older adults with DSI and their family carers (n=23), to extend current and develop new understandings of the meaning and experiences of DSI in a social context.
Findings from this study establish that the social experience of DSI can be understood as a series of asynchronous transitions and shared experiences that occur between the older person with DSI and their family carer. These findings are conceptualised as an ‘enduring state’, which represents the interrelated and embedded actions involved in the daily life work of DSI.
This research draws attention to the hidden arduous ‘lines of work’ shared by both those with DSI and their family carers, specifically the social work of DSI. This social line of work reflects experiences of social exclusion and poor recognition of DSI at micro, meso and macro levels of society. The age of participants, their associated co morbidities and declining personal agency impact access to the limited resources, support and information available, despite significant effort on their part. Complex processes of emotional and interactional disconnection are characterised by social loss, social effort and social isolation, shaped by changing roles and asynchronous adaptation to living with DSI.
Caring in this context is often predominantly social and ‘invisible’. To reduce the social effort of their family member with DSI and to maintain their own self-identity, family carers in this context adopted a ‘conscious caring’ approach. This is conceptualised in this thesis as an approach to caring that accounts for the subtle and enduring shared impacts of DSI. The power of ‘conscious’ in this context is the level of understanding of DSI that empowers family carers to recognise the shared elements of DSI and facilitate better articulation of needs to engage others within their care network. Caring was multifactorial with key characteristics of negotiation, facilitation, guardianship and creating opportunities. These caring characteristics were dynamic and strategic in that family carers sought opportunities that were mutually beneficial. Conscious caring contextualises the capacity of family carers to access resources embedded in their social networks by bridging the gap between the dyad (close ‘bonding’ ties) and broader social networks (i.e. weaker, ‘bridging’ and more diverse networks). Social capital is a critical factor in DSI; it is defined in this thesis as the flow of resources (such as social support, health information) via social networks at a personal and interpersonal level. A reduction in both bonding and bridging networks limits personal, social and psychosocial resources and impacts the capacity of the dyad to renegotiate their roles, create and maintain their individual and shared social networks, and successfully transition to living with DSI.
This study adopts a novel approach to understanding the social experiences of DSI from the ‘ground up’, that is, from the perspectives of older adults with DSI and their family carers. The shared experiences of DSI suggest that a socially inclusive, relational and interdisciplinary approach to future service, research and practice has merit in bridging the social gap that currently exists in the care and support available to the DSI family.
Books on the topic "Acquired dual sensory loss"
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Great Britain. Department of Health., ed. Think dual sensory: Good practice guidelines for older people with dual sensory loss. London: Department of Health, 1997.
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Stoneley, Sarah, and Simon Rinald. Sensory loss. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0047.
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Sensory disturbance can either be a complete loss (anaesthesia) or a reduction (hypoaesthesia) in the ability to perceive the sensory input. Dysaesthesia is an abnormal increase in the perception of normal sensory stimuli. Hyperalgesia is an increased sensitivity to normally painful stimuli, and allodynia is the perception of usually innocuous stimuli as painful. A complete loss of sensation is likely to be due to a central nervous system problem, while a tingling/paraesthesia (large fibre) or burning/temperature (small fibre) sensation is likely due to an acquired peripheral nervous system problem. Shooting, electric-shock-like pains suggest radicular pathology, a tight-band spinal cord dysfunction. Positive sensory symptoms are usually absent in inherited neuropathies, even in the context of significant deficits on examination. This chapter describes the clinical approach to patients with sensory symptoms. Common patterns of sensory loss and their causes are described.
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Janssen, Marleen J., Timothy Scotford Hartshorne, and Walter Wittich, eds. Development, Wellbeing, and Lifelong Learning in Individuals with a Dual Sensory Loss. Frontiers Media SA, 2021. http://dx.doi.org/10.3389/978-2-88971-692-0.
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Latronico, Nicola, Simone Piva, and Victoria McCredie. Long-Term Implications of ICU-Acquired Muscle Weakness. Oxford University Press, 2014. http://dx.doi.org/10.1093/med/9780199653461.003.0024.
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Intensive care unit-acquired weakness (ICUAW) is a significant and common complication with major implications for survivors of critical illness. ICUAW is a clinical diagnosis made in the presence of generalized muscle weakness that occurs in the setting of critical illness when other causes of muscle weakness have been excluded. Critical illness polyneuropathy and myopathy are the most common causes of ICUAW. Short-term implications of ICUAW include alveolar hypoventilation and an increased risk of pulmonary aspiration, atelectasis, and pneumonia—factors which may contribute to acute respiratory failure and ICU re-admission. In the long term, ICUAW has been associated with physical disturbances, including unsteady gait, sensory loss, foot drop, and, in more severe cases, persistent quadriparesis and ventilator dependency. ICUAW appears to heavily influence the failure of ICU patients to return to baseline health status post-discharge. There is a paucity of evidenced-based therapeutic strategies to reduce the incidence of ICUAW; however, early rehabilitative therapy might represent an effective measure in improving functional status.
Book chapters on the topic "Acquired dual sensory loss"
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Heine, Chyrisse. "Dual Sensory Loss." In Encyclopedia of Geropsychology, 1–6. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-080-3_265-1.
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Heine, Chyrisse. "Dual Sensory Loss." In Encyclopedia of Geropsychology, 692–98. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-287-082-7_265.
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Cole, Jonathan. "The embodied and social self: insights on body image and body schema from neurological conditions." In Body Schema and Body Image, 229–43. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198851721.003.0014.
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In neurological illnesses, the body may present itself to perception in ways which allows insights into the concepts of body image and body schema. Three such conditions are explored. From those who live with spinal cord injury, paralysed and insentient from the neck down, aspects of the importance of the body in one’s sense of self are revealed. Some also describe a coming to terms with their altered bodies. When considering the body image, its adaptability and this reconciliation to a new normal should be considered. Studies on acquired severe sensory loss explore how conscious control, at the body image level, may partially replace the deafferented body schema. There is little evidence, however, for these subjects extending access to previously non-conscious motor schema. Lastly, some narratives from those with congenital absence of movement of facial muscles describe reduced emotional experience and felt embodiment as children. These can be developed as young adults, through shared social interactions. The importance of the social in elaboration of the body image is further implicit in a consideration of the stigma associated with facial disfigurement. Others’ responses to one’s body are crucial in developing our body image and sense of self.
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Cox, Timothy M. "The porphyrias." In Oxford Textbook of Medicine, edited by Timothy M. Cox, 2032–54. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0231.
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The porphyrias are a remarkable family of metabolic disorders characterized biochemically by overproduction of haem precursors, principally in the liver and bone marrow. The acute porphyrias are inborn errors of varying penetrance that affect enzymatic steps in a tightly regulated biosynthetic pathway for haem; nonacute acquired forms also occur in genetically predisposed individuals. Clinical presentation of acute porphyria—life-threatening neurovisceral attacks occur in four of the porphyrias: acute intermittent porphyria, variegate porphyria, hereditary coproporphyria, and Doss’ porphyria (5-aminolaevulinate dehydratase deficiency). These present with abdominal pain, psychiatric symptoms, and signs of sympathetic and hypothalamic autonomic overactivity, sometimes accompanied by convulsions and motor and sensory deficits. Diagnosis of acute porphyria—this is key to survival of an acute attack of porphyria, which can be suspected on the basis of the past history, in particular of photosensitivity or the intermittent discoloration of urine, and family history, and is confirmed by finding excess water-soluble haem precursors in urine. Management of acute porphyria—treatment of an acute porphyric attack mandates immediate withdrawal of inappropriate drugs and other precipitating factors; infusions of haem arginate or other licensed preparations of haem shorten life-threatening episodes and may be effective prophylaxis for recurrent porphyria in women with periodic attacks. The nonacute porphyrias are photosensitivity syndromes caused by excess photoactive macrocyclic porphyrins triggered especially by visible light in the blue–violet range. In the most severe form, manifestations are of severe blistering lesions on sun-exposed skin, particularly of the hands and face, with the formation of vesicles and bullae that may become infected. Healing may lead to loss of digits, scarring of the eyelids, nose, lips, and scalp, and occasionally blindness due to corneal scarring.
Conference papers on the topic "Acquired dual sensory loss"
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Abad, Angelica Maria, Xavier Esteban Mendieta, and Omar Alvarado Cando. "Haptic Glove for Braille Interpretation for People with Acquired Dual Sensory Loss (ADSL)." In 2021 IEEE International Humanitarian Technology Conference (IHTC). IEEE, 2021. http://dx.doi.org/10.1109/ihtc53077.2021.9698915.
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Seddik, Ibrahim, Firdaus Noor Din, Alaa Shbair, Ahmed Fawzy, Abdullah Manea, Mourad Benfriha, Artur Galimov, Peter Raouf, and Neil Sookram. "Enhanced Flow Profile Evaluation by Combining Acoustic Noise Log and Thermal Modeling in Complex Design Wells." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211697-ms.
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Abstract Proper hydrocarbon field management requires evaluating downhole production and injection efficiencies. This process can however be very challenging in many well configurations with behind pipe or formation flow, such as horizontal wells, wells with inflow control devices (ICDs), or in dual and triple string completions, especially when using standard logging techniques. This paper highlights how additional measurements, such as high-sensitivity spectral noise and fast-response temperature, can improve the quantitative analyses obtained with conventional production logs (PLT). Production log analysis typically provides very reliable flow profiles inside the wellbore, but much of what is going on behind the pipe or directly in the formation around the well is hidden from the PLT sensors. The downhole flow environment is more completely characterized, however, by complementing the PLT analysis with spectral noise and thermal modelling, and current technology makes this possible on a single run in the well. Several regional cases are presented to show the technology and the results from the individual analyses, demonstrating how they can be integrated to improve the understanding of the downhole panorama. The case studies presented in the paper were selected from some of the more complicated operating environments in UAE production wells and are used to demonstrate how spectral noise and temperature data can successfully complement the downhole analyses obtained from specialized production logging sensors in these high-angle wells. The noise tools used for these logs are highly sensitive instruments recording across a wideband frequency spectrum to acquire noise signatures from very small fluid movements in and around the wellbore. The addition of thermal modeling on the high-resolution temperature data improved the flow profiling in the surrounding formations. The presented cases include producer wells, along with different types of lateral completions. Objectives among the examples also vary, showing production profiling, investigation of formation fluid movement, evaluation of flow behind casing, and diagnosis of leaks in the completion. The acquisition of data sets with different types of sensors not only helped improve the dynamic downhole analyses but also enabled corroboration of the responses among the tools, ultimately increasing the reliability of the interpretations provided to the well operator in these complex conditions. The case studies presented will demonstrate how operators can benefit from the effective use of the latest generation of spectral noise tools to qualitatively identify production intervals, in combination with thermal modelling to quantitatively estimate fluid distribution, and with production log data for wellbore flow and fluid profiling. The improved understanding of the downhole fluid dynamics is used to program more informed interventions, optimizing production efficiency, and overall field and reservoir economics.
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Xia, Shi-Yu, Jiaqi Lv, Ning Xu, and Xin Geng. "Ambiguity-Induced Contrastive Learning for Instance-Dependent Partial Label Learning." In Thirty-First International Joint Conference on Artificial Intelligence {IJCAI-22}. California: International Joint Conferences on Artificial Intelligence Organization, 2022. http://dx.doi.org/10.24963/ijcai.2022/502.
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Partial label learning (PLL) learns from a typical weak supervision, where each training instance is labeled with a set of ambiguous candidate labels (CLs) instead of its exact ground-truth label. Most existing PLL works directly eliminate, rather than exploiting the label ambiguity, since they explicitly or implicitly assume that incorrect CLs are noise independent of the instance. While a more practical setting in the wild should be instance-dependent, namely, the CLs depend on both the true label and the instance itself, such that each CL may describe the instance from some sensory channel, thereby providing some noisy but really valid information about the instance. In this paper, we leverage such additional information acquired from the ambiguity and propose AmBiguity-induced contrastive LEarning (ABLE) under the framework of contrastive learning. Specifically, for each CL of an anchor, we select a group of samples currently predicted as that class as ambiguity-induced positives, based on which we synchronously learn a representor (RP) that minimizes the weighted sum of contrastive losses of all groups and a classifier (CS) that minimizes a classification loss. Although they are circularly dependent: RP requires the ambiguity-induced positives on-the-fly induced by CS, and CS needs the first half of RP as the representation extractor, ABLE still enables RP and CS to be trained simultaneously within a coherent framework. Experiments on benchmark datasets demonstrate its substantial improvements over state-of-the-art methods for learning from the instance-dependent partially labeled data.
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Schneider, C. M., D. Schrack, M. Kuerner, M. G. Rose, S. Staudacher, Y. Guendogdu, and U. Freygang. "On the Unsteady Formation of Secondary Flow Inside a Rotating Turbine Blade Passage." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94091.
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This paper addresses the unsteady formation of secondary flow structures inside a turbine rotor passage. The first stage of a two-stage low pressure turbine is investigated at a Reynolds Number of 75 000. The design represents the third and the fourth stages of an engine representative low pressure turbine. The flow field inside the rotor passage is discussed in the relative frame of reference using the streamwise vorticity. A multi-stage URANS prediction provides the time-resolved data set required. It is supported by steady and unsteady area traverse data acquired with five-hole probes and dual-film probes at rotor inlet and exit. The unsteady analysis reveals a non-classical secondary flow field inside the rotor passage of this turbine. The secondary flow field is dominated by flow structures related to the upstream nozzle guide vane. The interaction processes at hub and casing appear to be mirror images and have characteristic forms in time and space. Distinct loss zones are identified which are associated with vane-rotor interaction processes. The distribution of the measured isentropic stage efficiency at rotor exit is shown which is reduced significantly by the secondary flow structures discussed. Their impacts on the steady as well as on the unsteady angle characteristics at rotor exit are presented to address the influences on the inlet conditions of the downstream nozzle guide vane.
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Olsson, Nasrine, and Elena Maceviciute. "Information worlds of people with deafblindness." In ISIC: the Information Behaviour Conference. University of Borås, Borås, Sweden, 2020. http://dx.doi.org/10.47989/irisic2012.
Full textAbstract:
Introduction. This paper explores the information world of people with deafblindness, i.e., a diverse group of people whose vision and hearing loss are of such severity that it is hard for their impaired senses to compensate for each other. Method. An extensive interview study conducted in five European countries. It has examined the level, form and accessibility of information available to people with deafblindness. This paper draws on these interviews, and other material and observations, in providing general characteristics and the results presented here. However, the data and quotations presented in this paper are from the interviews conducted by the authors in Sweden. Analysis. The analysis of the interviews was done using the coding scheme based on the concepts of small worlds and the theory of information world looking for emerging themes. The scheme was flexible and additional themes were included into it during analysis when they emerged from the data. Results. The study found that while the lives of most people are facilitated by an abundance of information in various forms and often in taken for granted format, this is not the case for those members of the society with deafblindness who need such information the most. The means of signification and information sources are limited for people with deafblindness not only because of dual sensory impairments, but mainly because of the limited opportunities afforded outside their small worlds. Conclusions. The improvement of information infrastructures aimed at people with deafblindness will benefit the society and its democratic foundations as a whole and will strengthen the participation of people with deafblindness.