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Journal articles on the topic 'Generalised stiffness'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Vanhaesebrouck, An, Nicholas Granger, and Laurent Garosi. "Extreme generalised muscular stiffness in young labrador retrievers: Fig 1." Veterinary Record 170, no. 6 (2012): 161.3–162. http://dx.doi.org/10.1136/vr.e946.

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Ibe, Uzochukwu, Sameerah Rehmani, Nasheena Jiwa, and Arjet Gega. "Return of the old guard: a case of tetanus in an unvaccinated patient." BMJ Case Reports 12, no. 6 (2019): e229502. http://dx.doi.org/10.1136/bcr-2019-229502.

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A 78-year-old woman with no known medical history presented with severe neck pain that began 4 days prior to admission located in the paraspinal cervical region radiating to the shoulders, legs and back. She had associated stiffness of her neck and progression of pain to her jaw and throat with progression to generalised body spasms with lower extremity stiffness and weakness that limited her ability to walk. She quickly developed dysphagia and odynophagia with subsequent generalised spasms and profound hypoxic respiratory failure requiring nasotracheal intubation. The presumptive diagnosis of

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Civera, Marco, Stefano Grivet-Talocia, Cecilia Surace, and Luca Zanotti Fragonara. "A generalised power-law formulation for the modelling of damping and stiffness nonlinearities." Mechanical Systems and Signal Processing 153 (May 2021): 107531. http://dx.doi.org/10.1016/j.ymssp.2020.107531.

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Russillo, Andrea Francesco, Giuseppe Failla, Ada Amendola, and Raimondo Luciano. "On the Free Vibrations of Non-Classically Damped Locally Resonant Metamaterial Plates." Nanomaterials 12, no. 3 (2022): 541. http://dx.doi.org/10.3390/nano12030541.

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In this paper, the focus is on the free vibrations of locally resonant metamaterial plates with viscously damped resonators. Upon formulating a dynamic-stiffness model where the resonators are represented via pertinent reaction forces depending on the deflections of the attachment points, the complex eigenvalues are calculated by a contour-integral algorithm introduced in the literature for general nonlinear eigenvalue problems. The interest in the proposed approach is twofold. The dynamic-stiffness model involves a limited number of generalised coordinates compared to the nodal degrees of fre

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Vinjam, Maruthi Ravi, Priya Shanmugarajan, and Helen Ford. "STIFF PERSON SYNDROME PRESENTING AS ‘STIFF EYES’." Journal of Neurology, Neurosurgery & Psychiatry 86, no. 11 (2015): e4.125-e4. http://dx.doi.org/10.1136/jnnp-2015-312379.36.

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A 47-year previously fit and well lady presented with 6 weeks history of generalised lethargy, weight loss and neck pain. Her examination revealed left supra-clavicular lymph nodes. Subsequent investigations revealed left grade 2 invasive ductal carcinoma of her left breast. This was treated with local excision.She presented to hospital four weeks following her surgery with progressive double vision and unsteadiness. Her cranial nerve examination showed severly restricted pursuit and saccadic horizontal eye movements with intact vertical eye movements. She had normal strength with intact deep

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Massamba, Victoria K., Denis Talbot, Alain Milot, et al. "Association between psychosocial work-related factors at midlife and arterial stiffness at older age in a prospective cohort of 1736 white-collar workers." BMJ Open 13, no. 9 (2023): e073649. http://dx.doi.org/10.1136/bmjopen-2023-073649.

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ObjectiveArterial stiffness and exposure to psychosocial work-related factors increase the risk of developing cardiovascular disease. However, little is known about the relationship between psychosocial work-related factors and arterial stiffness. We aimed to examine this relationship.DesignProspective cohort study.SettingPublic organisations in Quebec City, Canada.ParticipantsThe study included 1736 white-collar workers (women 52%) from 19 public organisations.Primary and secondary outcome measuresAssociation between psychosocial work-related factors from the job strain and effort–reward imba

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O'hEireamhoin, S., T. Bayer, and K. J. Mulhall. "Total Hip Arthroplasty in Mucopolysaccharidosis Type IH." Case Reports in Orthopedics 2011 (2011): 1–2. http://dx.doi.org/10.1155/2011/832439.

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Children affected by mucopolysaccharidosis (MPS) type IH (Hurler Syndrome), an autosomal recessive metabolic disorder, are known to experience a range of musculoskeletal manifestations including spinal abnormalities, hand abnormalities, generalised joint stiffness, genu valgum, and hip dysplasia and avascular necrosis. Enzyme therapy, in the form of bone marrow transplantation, significantly increases life expectancy but does not prevent the development of the associated musculoskeletal disorders. We present the case of a 23-year-old woman with a diagnosis of Hurler syndrome with a satisfactor

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Guo, Pan, Wen-Hua Wu, and Jun Zhao. "Modelling of Generalised Thermoelastic Wave Propagation of Multilayer Material under Thermal Shock Behaviour." Shock and Vibration 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/8398673.

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This paper describes a time-discontinuous Galerkin finite element method (DGFEM-βc) for the generalised thermoelastic problem of multilayer materials subjected to a transient high-frequency heat source. The governing and constitutive relations are presented on the basis of the well-known Lord–Shulman (L–S) theory. A DGFEM-βc method is developed to allow the general temperature-displacement vector and its temporal gradient to be discontinuous at a fixed time t. A stiffness proportional artificial damping term is added to the final DG discretisation form to filter out the spurious numerical osci

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Kovacic, Ivana. "Generalised perturbation techniques for strongly nonlinear oscillators with a positive, zero or negative linear stiffness term." International Journal of Dynamics and Control 3, no. 2 (2015): 137–47. http://dx.doi.org/10.1007/s40435-014-0147-9.

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Muratov, Kamil, Danil Likhachev, Roman Sokolov, Anna Chekhunova, Marina Osintseva, and Alexei Vaganov. "Influence of rope fastening on the spectrum of its natural transverse vibrations." Defektoskopiâ, no. 11 (November 11, 2024): 65–77. http://dx.doi.org/10.31857/s0130308224110062.

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According to the previously developed method, which takes into account the bending stiffness of steel ropes during their transverse oscillation, the ropes of the pedestrian bridge ‘Lovers’ in the city of Tyumen were investigated. The obtained values of tension forces and bending stiffness were within the expected range. The high variation of bending stiffness values forced to pay attention to the accuracy of the initial values of rope lengths, which were obtained from the photograph. To measure the rope lengths, a method of nodal harmonic registration was proposed, but the results obtained by

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Gennaretti, M., L. Poloni, and F. Nitzsche. "‘Smart spring’ identification for hovering rotor aeroelastic-stability augmentation." Aeronautical Journal 107, no. 1071 (2003): 233–40. http://dx.doi.org/10.1017/s0001924000013300.

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Abstract This work deals with tailoring of adaptive material included at the roots of hingeless helicopter rotor blades to be used in individual blade control (IBC) strategies. Usually, IBC strategies involving the use of adaptive materials either consider adaptive material embedded in the blade structure for inducing strain deformations, or apply adaptive actuators for controlling segments of the blade (e.g. for moving trailing-edge flaps). Here, the adaptive material is used to provide augmentation of modal damping in a passive control approach, that can be conveniently tuned so as to make i

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Chen, Xudong, and Kangsheng Ye. "Free Vibration Analysis for Shells of Revolution Using an Exact Dynamic Stiffness Method." Mathematical Problems in Engineering 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/4513520.

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An exact generalised formulation for the free vibration of shells of revolution with general shaped meridians and arbitrary boundary conditions is introduced. Starting from the basic shell theories, the vibration governing equations are obtained in the Hamilton form, from which dynamic stiffness is computed using the ordinary differential equations solver COLSYS. Natural frequencies and modes are determined by employing the Wittrick-Williams (W-W) algorithm in conjunction with the recursive Newton’s method, thus expanding the applications of the abovementioned techniques from one-dimensional s

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Zhao, Xuan, Binsheng Zhang, Tony Kilpatrick, Iain Sanderson, and Dewen Liu. "Numerical Analysis on Global Serviceability Behaviours of Tall Glulam Frame Buildings to the Eurocodes and UK National Annexes." Journal of Civil Engineering and Construction 10, no. 3 (2021): 109–22. http://dx.doi.org/10.32732/jcec.2021.10.3.109.

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Glued-laminated timber (Glulam) is an innovative engineered timber product and has been widely used for constructing spatial grand timber structures and tall timber buildings due to its exceptional natural attraction, easy processing, decent fire resistance and outstanding structural performance. However, global serviceability performances of tall timber buildings constructed from Glulam products for beams, columns and bracings and CLT products for lift core and floors under wind load are not well known yet though they are crucial in structural design and global analysis. In this study, finite

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Mieczkowski, Grzegorz, Dariusz Szpica, Andrzej Borawski, Mohamed M. Awad, Ahmed Elgarayhi, and Mohammed Sallah. "Investigation of the Near-Tip Stress Field of a Notch Terminating at a Bi-Material Interface." Materials 14, no. 16 (2021): 4466. http://dx.doi.org/10.3390/ma14164466.

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The article deals with the problem of a sharp corner, the tip of which is located on the bi-material interface. The paper presents a qualitative and quantitative description of singular stress fields occurring in the tip area of such a stress concentrator. The qualitative description was obtained by solving the problem of the plane theory of elasticity with appropriately defined boundary conditions. To obtain a quantitative description, it was necessary to determine the values of generalised stress intensity factors (GSIFs). The GSIFs were determined using the developed analytical-numerical me

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Vitello, Giuseppe, Beatrice Enrica Carletti, Sergio A. Gomes, et al. "Clinical Features, MRI Findings, Treatment, and Outcomes in Dogs with Haemorrhagic Myelopathy Secondary to Steroid-Responsive Meningitis-Arteritis: Nine Cases (2017–2024)." Veterinary Sciences 12, no. 5 (2025): 476. https://doi.org/10.3390/vetsci12050476.

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This retrospective multicentre study investigated haemorrhagic myelopathy as a rare complication of steroid-responsive meningitis-arteritis (SRMA) in nine dogs. The affected dogs exhibited varied neurological deficits, including cervical hyperesthesia, generalised stiffness, ambulatory tetraparesis, and, in the most severe cases, paraplegia without nociception. MRI findings primarily localised haemorrhagic lesions to the thoracolumbar (T3-L3) region, with intradural–extramedullary haemorrhages being the most common type. Most cases responded favourably to immunosuppressive therapy with prednis

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Diala, Uchenna, Yunpeng Zhu, and Rajintha Gunawardena. "Investigative Study of the Effect of Damping and Stiffness Nonlinearities on an Electromagnetic Energy Harvester at Low-Frequency Excitations." Machines 12, no. 1 (2024): 30. http://dx.doi.org/10.3390/machines12010030.

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Ambient vibration energy is widely being harnessed as a source of electrical energy to drive low-power devices. The vibration energy harvester (VEH) of interest employs an electromagnetic transduction mechanism, whereby ambient mechanical vibration is converted to electrical energy. The limitations affecting the performance of VEHs, with an electromagnetic transduction structure, include its operational bandwidth as well as the enclosure-size constraint. In this study, an analysis and design of a nonlinear VEH system is conducted using the Output Frequency Response Function (OFRF) representati

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17

Taig, Gerard, and Gianluca Ranzi. "Generalised Beam Theory for composite beams with longitudinal and transverse partial interaction." Mathematics and Mechanics of Solids 22, no. 10 (2016): 2011–39. http://dx.doi.org/10.1177/1081286516653799.

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This paper presents a Generalised Beam Theory formulation to study the partial interaction behaviour of two-layered prismatic steel–concrete composite beams. The novelty of the proposed approach is in its capacity to handle the deformability of the shear connections at the interface between the slab and steel beam in both the longitudinal and transverse directions in the evaluation of the deformation modes. This method falls within a category of cross-sectional analyses available in the literature for which a suitable set of deformation modes, including conventional, extension and shear, is de

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Behera, A. K., and B. K. Nanda. "Dynamic Characteristics of Structures Bonded with Viscoelastic Unconstrained Layers." Transactions of the Canadian Society for Mechanical Engineering 10, no. 3 (1986): 175–82. http://dx.doi.org/10.1139/tcsme-1986-0020.

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In order to control the intensity of troublesome vibration in the modern day structures, viscoelastic materials are sometimes bonded to one or both sides of those structures. This type of unconstrained damping layer treatment is quite effective for abating structural vibration. In this paper both theoretical and experimental investigation has been made on the dynamic characteristics of such beam-like structures in order to get sufficient design data. Theoretical analysis based on the energy principle is presented in a generalised form for predicting damped and undamped natural frequencies as w

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19

Wang, Zixiao, and Konstantinos Daniel Tsavdaridis. "Optimality criteria-based minimum-weight design method for modular building systems subjected to generalised stiffness constraints: A comparative study." Engineering Structures 251 (January 2022): 113472. http://dx.doi.org/10.1016/j.engstruct.2021.113472.

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20

Henriksen, Peter, Tina Junge, Jens Bojsen-Møller, Birgit Juul-Kristensen, and Jonas Bloch Thorlund. "Supervised, Heavy Resistance Training Is Tolerated and Potentially Beneficial in Women with Knee Pain and Knee Joint Hypermobility: A Case Series." Translational Sports Medicine 2022 (December 30, 2022): 1–11. http://dx.doi.org/10.1155/2022/8367134.

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Introduction. Adults with generalised joint hypermobility including knee joint hypermobility (GJHk) report more knee joint symptoms when compared to adults without GJHk. There is no consensus on best practice for symptom management. For instance, controversy exists regarding the appropriateness and safety of heavy resistance training as an intervention for this specific group. This case series aims to describe a supervised, progressive heavy resistance training program in adults with GJHk and knee pain, the tolerability of the intervention, and the outcomes of knee pain, knee-related quality o

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Mikoliūnas, Audrius, and Rimantas Kačianauskas. "STIFFNESS CHARACTERISTICS OF GEOMETRICALLY NON-LINEAR BEAM FINITE ELEMENT/GEOMETRIŠKAI NETIESINIO LENKIAMO STRYPO BAIGTINIO ELEMENTO STANDUMO RODIKLIŲ NUSTATYMAS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 3, no. 10 (1997): 52–59. http://dx.doi.org/10.3846/13921525.1997.10531684.

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Two-dimensional geometrically non-linear beam element is considered in this paper. The explicit expressions of stiffness characteristics of element with three nodes are derived and tested. Among models of the geometrically non-linear beams, the elements with 2 nodes dominate [1–8]. Such elements produce constant axial force. The idea of more complex elements with tree nodes was suggested in [3]. In this paper geometrically non-linear flat bending beam element with 3 nodes for evaluating of axial force is investigated and nonlinear stiffness characteristics are derived. Basic relations of eleme

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Jeet, Amar, Anil Kumar Sharma, and Dheeraj Mehra. "AYURVEDIC MANAGEMENT OF RHEUMATOID ARTHRITIS WSR TO AMAVATA- A CASE REPORT." International Journal of Advanced Research 12, no. 07 (2024): 287–91. http://dx.doi.org/10.21474/ijar01/19054.

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Introduction: The Ayurveda described Mandagni as the root cause of all the diseases. The Acharyas mentioned Amavata as one of the common disorders caused by the impairment of Agni, formation of Ama and vitiation of Vata Dosha. The Ama is carried by the vitiated Vata and deposited in Shleshmasthanas producing symptoms like Angmarda, Aruchi, Alasya, Sandhiruk and Sandhishoth. On the basis of sign and symptoms Amavata can be equated to Rheumatoid Arthritis in modern era. Rheumatoid arthritis is a systemic autoimmune disease characterised by inflammatory arthritis and extra articular involvement.

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Baldry, Peter. "Fibromyalgia: A Review of Current Knowledge." Acupuncture in Medicine 10, no. 1 (1992): 13–17. http://dx.doi.org/10.1136/aim.10.1.13.

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Muscular pain in the presence of a normal ESR has laboured under a variety of names and supposed causes, often being dismissed as psychogenic in origin. It is now clear that there are two specific disorders of body musculature, each with its own defined pattern of symptoms. Fibromyalgia is a disease of unknown aetiology, predominantly affecting women, that gives generalised muscular pain, a disturbed sleep pattern, morning stiffness and fatigue. Tender spots are found at certain charecteristic sites. The Myofascial Pain Syndromes, on the other hand, can usually be related to some form of traum

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Al-Zoubi, Saif, Alameen Alsabbah, Maggie Wassouf, and Asmaa Al-Mnayyis. "Emerging non-pharmacological refractory intervention for pain relief in fibromyalgia: A case report." Scripta Medica 54, no. 2 (2023): 213–16. http://dx.doi.org/10.5937/scriptamed54-43092.

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Fibromyalgia (FM) is a common disorder characterised by widespread musculoskeletal pain often associated with fatigue, sleep, memory and mood disturbances. Females are more likely to suffer from FM and experience a reduced quality of life. This is a case report of a 21-year-old female patient diagnosed with FM whose pain was managed by a non-pharmacological method, weightlifting exercises. The patient suffered from chronic generalised muscular pain, muscle stiffness, fatigue, depression and anxiety. She was started on a tight progressive weight-lifting program to increase muscle mass. The prog

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Kumar, Ajeet, Luca Collini, Chiara Ursini, and Jeng-Ywan Jeng. "Energy Absorption and Stiffness of Thin and Thick-Walled Closed-Cell 3D-Printed Structures Fabricated from a Hyperelastic Soft Polymer." Materials 15, no. 7 (2022): 2441. http://dx.doi.org/10.3390/ma15072441.

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This study analyses the energy absorption and stiffness behaviour of 3D-printed supportless, closed-cell lattice structures. The unit cell design is bioinspired by the sea urchin morphology having organism-level biomimicry. This gives rise to an open-cell lattice structure that can be used to produce two different closed-cell structures by closing the openings with thin or thick walls, respectively. In the design phase, the focus is placed on obtaining the same relative density with all structures. The present study demonstrates that closure of the open-cell lattice structure enhances the mech

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Zhao, Xuan, Binsheng Zhang, Tony Kilpatrick, and Iain Sanderson. "Numerical Analysis on Global Serviceability Behaviours of Tall CLT Buildings to the Eurocodes and UK National Annexes." Buildings 11, no. 3 (2021): 124. http://dx.doi.org/10.3390/buildings11030124.

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Cross-laminated timber (CLT) is an innovative engineered timber product and has been widely used for constructing tall timber buildings due to its excellent structural performance and good strength with its multi-layers of boards in both perpendicular directions. However, the global serviceability performance of tall timber buildings constructed from CLT products for the lift core, walls, and floors under wind load is not well known yet, even though it is crucial in a design. In this study, the finite element software SAP2000 is used to numerically simulate the global static and dynamic servic

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Anusha, Mekala, Rithvik Ramesh, Sundar Shanmugam, et al. "Camptocormia in a young man with anti-GAD-seropositive stiff-person syndrome." BMJ Case Reports 17, no. 8 (2024): e262122. http://dx.doi.org/10.1136/bcr-2024-262122.

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Stiff-person syndrome (SPS) usually manifests as an autoimmune neuromuscular disorder characterised by pronounced and advancing rigidity, primarily affecting the trunk and proximal muscles. There are various clinical subtypes like classic SPS (truncal stiffness, generalised rigidity and muscle spasms), partial SPS (stiff-limb syndrome) and uncommon forms including progressive encephalomyelitis with rigidity and myoclonus. Camptocormia, defined as forward flexion of the spine in the upright position that disappears in the supine position, without fixed deformity, has been described only in two

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Bretag, Allan H. "Myotonic diseases since Asmus Julius Thomas Thomsen (1815–1896) and Peter Emil Becker (1908–2000)." Proceedings of the Royal Society of Victoria 127, no. 1 (2015): 59. http://dx.doi.org/10.1071/rs15005.

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Julius Thomsen first published his account of myotonia (an unusual muscle stiffness disorder) in himself and his family in 1876. By November 1971, Peter Becker was already famous for his eponymous Becker muscular dystrophy when he came to the Second International Congress on Muscle Diseases, in Perth. There, he presented an extensive study of myotonia, recognising a recessively inherited disease (now known as Becker’s recessive generalised myotonia), distinct from Thomsen’s myotonia congenita and clearly distinguishable from Steinert’s myotonic dystrophy, both dominantly inherited. Peter Becke

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Arbab, Preh, Zofishan Anwar, Raveeha Aamir, and Fareed Ahmed. "Acquired hyperkalaemia leading to periodic paralysis: an emergency department perspective." BMJ Case Reports 17, no. 5 (2024): e260151. http://dx.doi.org/10.1136/bcr-2024-260151.

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Hyperkalaemia is one of the common electrolyte imbalances dealt with in the emergency department and is caused by extracellular accumulation of potassium ions above normal limits usually greater than 5.0–5.5 mmol/L. It is found in a total of 1–10% of hospitalised patients usually associated with chronic kidney disease and heart failure. The presentation can range from being asymptomatic to deadly arrhythmias. The appearance of symptoms depends on the rate of change rather than just the numerical values. The rare presentation includes periodic paralysis characterised by the sudden onset of shor

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Yullytia, Franika Maryati, James Godwin Ross, and Sugeng Ahmad. "Seizure After Ischemic Stroke; A Diagnostic and Management Challenge in a Resource Limited Setting: A Case Report." International Journal Of Medical Science And Clinical Research Studies 03, no. 05 (2023): 970–73. https://doi.org/10.5281/zenodo.7970357.

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<strong>Background:</strong> Poststroke seizures occur in 6-8% of the adult population that suffer an ischaemic stroke. This pathological process increases metabolic stress and cell death, the extent of vascular obstruction in the brain, the mortality rate and long term morbidity. Poststroke seizures represent one of the most important complications of stroke that must be recognised and treated in a timely fashion. These are classified as either early or late depending on the time of onset after stroke.   <strong>Case Report</strong><strong>:</strong> A 51 year old woman present

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Erolu, Elif, Figen Akalın, Nilüfer Çetiner, and Berna Ç. Şaylan. "Aortic elasticity and the influence of valve morphology in children with bicuspid aortic valve." Cardiology in the Young 28, no. 11 (2018): 1338–44. http://dx.doi.org/10.1017/s1047951118001348.

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AbstractAimWe investigated dimensions and elasticity of whole aorta in patients with bicuspid aortic valve and influence of valve phenotype.MethodThe study group included 44 patients and 42 controls. Patients were divided into groups according to the type of valve opening as horizontal – fusion between right and left coronary cusps – and vertical – fusion between right–non-coronary cusps; according to age they were divided into younger (5–10 years) and older patients (11–16 years). Our study did not include valve phenotype with fusion between left and non-coronary cusps. Systolic–diastolic dia

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Osterstock, Frédéric, and Olivier Vansse. "A Tensile-Load Relaxation Test for Measuring the Stress Enhanced Corrosion Exponent of Ceramics with Open Porosity." Key Engineering Materials 280-283 (February 2007): 1751–56. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1751.

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A tensile test is proposed for evaluating the stress enhanced corrosion-coefficient of ceramics with open porosity. The analysis of load at fixed grip conditions bases on the assumption that stress corrosion results in a spread of pre-existing generalised damage seen as micro-crack starter due to open porosity. Sub-critical crack extension of microcracks departs from pores and provokes a time dependant diminution of the Young’s modulus, and of the stiffness, of the tested sample. The description derives the number and the size of pre-existing micro-cracks with respect to time. The density of m

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Marc, Edwards, Lammie Alistair, Patel Chirag, Schwarz Stefan, and Wardle Mark. "WED 243 Enhancing our knowledge of leptomeningeal disease – a case of DL-GNT." Journal of Neurology, Neurosurgery & Psychiatry 89, no. 10 (2018): A35.3—A35. http://dx.doi.org/10.1136/jnnp-2018-abn.123.

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A 57-year-old woman presented with several weeks of headache associated with neck stiffness, drowsiness and nausea. She developed diplopia with right-sided 6th nerve palsy and subsequently developed a complex ophthalmoplegia and right-sided ptosis.Repeated lumbar punctures showed high opening pressures of up to 60 cm H2O and high protein levels up to 2.48 g/L. She developed episodes of marked loss of responsiveness but EEGs showed only generalised slowing. Brain imaging was essentially normal. An MRI Spine showed an enhancing intramedullary hyperintensity T8-T10 with overlying meningeal enhanc

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Lee, Joon Kyu, Jong Cheon Lee, Jong Min Choi, and Byoung Koo Lee. "Generalized stiffness of laterally functionally graded materials and implementation to dynamic beam element." Engineering Solid Mechanics 13, no. 1 (2025): 39–52. https://doi.org/10.5267/j.esm.2024.8.004.

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This study investigates the generalized stiffness of laterally functionally graded materials (LFGMs) and applies these findings to dynamic beam elements. The generalized stiffnesses of LFGM, coupled with material and cross-sectional properties such as flexural and axial rigidity, mass per unit length, and mass-moment of inertia, are explicitly formulated. In the context of LFGM, material properties depend on an asymmetrical power law function with respect to cross-sectional depth. An example of the generalized numerical stiffness of a circular cross-section is provided for various material pro

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Atkočiūnas, J. "DISTORSION IN STRUCTURAL MECHANICS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 1, no. 1 (1995): 3–24. http://dx.doi.org/10.3846/13921525.1995.10531499.

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The behaviour of elastic perfectly plastic structures under given loadings and distorsion is examined until plastic failure (analysis problem). “Distorsion” is here for the strain which does not satisfy the compatibility equations. A distorsion can be caused by prestressing, supports displacements or lack of precision during fabrication stage (the plastic strain is the example of distorsion, too). The mathematical models for analysis problems are created by the help of extremum energy principles—principles of complementary energy and total potential energy minimum. The emphasis is put on tradi

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White, George, Fletcher Bright, Ebonie K. Rio, Ruth L. Chimenti, and Myles C. Murphy. "Do Anxiety, Depression, Fear of Movement and Fear of Achilles Rupture Correlate with Achilles Tendinopathy Pain, Symptoms or Physical Function?" Journal of Clinical Medicine 14, no. 2 (2025): 473. https://doi.org/10.3390/jcm14020473.

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Objectives: To determine if psychological factors, such as anxiety, depression, fear of movement and fear of rupture are associated with increased tendon-related disability, quantified by the Tendinopathy Severity Assessment-Achilles (TENDINS-A). Design: Cross-sectional. Setting: Online Qualtrics survey. Participants: Sixty-eight participants (54% female) with Achilles tendinopathy and a mean (standard deviation) age of 40.1 (12.6) years. Main Outcome Measures: The TENDINS-A (including subscales of pain; symptoms such as stiffness; physical function), Patient Health Questionnaire-9, General An

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Kalamkarov, A. L., and A. G. Kolpakov. "On the Analysis and Design of Fiber-Reinforced Composite Shells." Journal of Applied Mechanics 63, no. 4 (1996): 939–45. http://dx.doi.org/10.1115/1.2787250.

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Closed-form solutions based on a general homogenization composite shell model are obtained for the effective stiffness moduli of the high-stiffness fiber-reinforced angle-ply composite shell. The design problem for the fiber-reinforced shell having the required set of effective stiffnesses is formulated and solved. The set of prescribed stiffnesses for which the design problem is solvable is described, and the effective method of the design parameters calculation based on convex analysis is developed. The minimum number of reinforcing layers required for the design of the fiber-reinforced angl

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Liaghat, Behnam, Jens Bojsen-Møller, Birgit Juul-Kristensen, et al. "High-load strength training compared with standard care treatment in young adults with joint hypermobility and knee pain: study protocol for a randomised controlled trial (the HIPEr-Knee study)." BMJ Open 14, no. 10 (2024): e090812. http://dx.doi.org/10.1136/bmjopen-2024-090812.

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IntroductionPatients with generalised joint hypermobility, including knee hypermobility (GJHk), often experience knee pain and are typically managed with low-intensity strength training and/or proprioceptive training as part of standard care. However, not all patients experience satisfactory outcomes. High-load strength training may offer additional benefits, such as increased muscle cross-sectional area, neural drive and tendon stiffness, which may reduce pain and improve active knee joint stability during movement tasks and daily activities. So far, no randomised controlled trials (RCTs) hav

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Wu, Guanglei, Shaoping Bai, and Jørgen Kepler. "Stiffness characterization of a 3-PPR planar parallel manipulator with actuation compliance." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 12 (2014): 2291–302. http://dx.doi.org/10.1177/0954406214557341.

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This paper investigates the stiffness of a compliant planar parallel manipulator. Instead of establishing stiffness matrix directly for planar mechanisms, we adopt the modeling approach for spatial mechanisms, which allows us to derive two decoupled homogeneous matrices, corresponding to the translational and rotational stiffness. This is achieved by resorting to the generalized eigenvalue problem, through which the eigenscrew decomposition is implemented to yield six screw springs. The principal stiffnesses and their directions are then identified from the eigenvalue problem of the two separa

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SILVA, N. M. F., D. CAMOTIM, N. SILVESTRE, and R. DEGENHARDT. "ON THE USE OF GENERALIZED BEAM THEORY TO ASSESS THE BUCKLING AND POSTBUCKLING BEHAVIOR OF LAMINATED CFRP CYLINDRICAL STIFFENED PANELS." International Journal of Structural Stability and Dynamics 10, no. 04 (2010): 737–60. http://dx.doi.org/10.1142/s0219455410003713.

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This paper presents the numerical implementation and illustrates the application and potential of a nonlinear elastic generalised beam theory (GBT) beam finite formulation to analyze the postbuckling behavior of laminated CFRP composite thin-walled prismatic cylindrical panels. This formulation (i) is based on a novel GBT cross-section analysis approach, (ii) accounts for the presence of initial geometrical imperfections and (iii) adopts an incremental iterative solution procedure employing the Newton–Raphson method and an arclength control strategy. No stiffness degradation or ply failure is

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Ge, Zijian, Shulin Pan, Jingye Li, Dongjun Zhang, and Haoran Luo. "Estimation of weak anisotropy parameters and fracture density of asymmetric fractures in monoclinic medium." Journal of Geophysics and Engineering 17, no. 6 (2020): 1049–64. http://dx.doi.org/10.1093/jge/gxaa063.

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Abstract One of the typical anisotropic media is the monoclinic anisotropy (MA) medium, which is formed by embedding two sets of non-orthogonal fracture sets into an isotropic or vertical transverse isotropic (VTI) background medium. Weak anisotropy (WA) parameters and fracture density provide important in situ stress and high-porosity zone information. Estimation of WA parameters and fracture density of MA medium by prestack seismic amplitude inversion is important for shale reservoir characterisation. We derive the expression of generalised WA parameters in a basic reflection coefficients fo

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Alvelid, M. "Nonlinear Fluid-Structure Interaction in Propeller Aircraft Cabins." Journal of Vibration and Acoustics 119, no. 3 (1997): 363–73. http://dx.doi.org/10.1115/1.2889732.

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A procedure for studying the acoustic superharmonic response in propeller aircraft cabins subject to stationary single frequency load excitation is proposed. The harmonic balance method is used to solve the nonlinear fluid-structure interaction multi-degree-of-freedom problem at hand. In the problem studied, the structure is nonlinear while the fluid remains linear. In the solution method proposed, generalised coordinates of the assumed series expansion for the displacements are used as unknowns. Two examples, simulating an aircraft structure with a fluid cavity, are examined. The present calc

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Onundi, L.O, D.S Matawal, and A.U Elinwa. "THE INFLUENCE OF EULER CRITICAL LOAD ON THE METHOD OF INITIAL PARAMETERS FOR THE DYNAMIC ANALYSIS OF A MULTI-STOREY BUILDING SUBJECTED TO AERODYNAMIC FORCES." Continental J. Engineering Sciences 5, no. 1 (2010): 1–13. https://doi.org/10.5281/zenodo.833729.

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This research work used a combination of the method of virtual works and Euler’s critical load to determine modified stiffness, angular frequency and later the generalised flexural rigidity EI<sub>on</sub> by taking into consideration the influence of axial load and consequently the total modal mass (m ) on the model (multi-storey building). The study used these modified and assessed quantities, on the original equations governing the method of initial parameters to transform them from one hitherto recognised as suitable for the design of a beam on elastic foundation; to another one now propos

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Aquilina, Neville, and Vincent Bugeja. "Forced Diuresis and Expedient Blood Pressure Control in the Management of Quetiapine Induced Neuroleptic Malignant Syndrome: A Case Report." Open Access Macedonian Journal of Medical Sciences 6, no. 7 (2018): 1267–70. http://dx.doi.org/10.3889/oamjms.2018.160.

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BACKGROUND: This case report intends to highlight the importance of safeguarding renal function from rhabdomyolysis in neuroleptic malignant syndrome (NMS) by concomitant administration of parenteral fluids at a high rate together with high doses of parenteral loop diuretics (we utilised 6 mg bumetanide daily) and tailed over a few days, in order to preserve glomerular/renal medullary perfusion and nephron function.CASE REPORT: This case describes an elderly lady previously diagnosed with Lewy body dementia who had been started on low dose quetiapine a few days previously and presented with an

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Mutz, Julian, and Cathryn M. Lewis. "Age-related changes in physiology in individuals with lifetime bipolar disorder." BJPsych Open 7, S1 (2021): S276. http://dx.doi.org/10.1192/bjo.2021.733.

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AimsIndividuals with bipolar disorder have reduced life expectancy and may experience accelerated biological ageing. In individuals with lifetime bipolar disorder and healthy controls, we examined differences in age-related changes in physiology.MethodThe UK Biobank study recruited >500,000 participants, aged 37–73 years, between 2006–2010. Generalised additive models were used to examine associations between age and grip strength, cardiovascular function, body composition, lung function and bone mineral density. Analyses were conducted separately in males and females with bipolar disorder

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Ghafoor, Abdul, Jian S. Dai, and Joseph Duffy. "Stiffness Modeling of the Soft-Finger Contact in Robotic Grasping." Journal of Mechanical Design 126, no. 4 (2004): 646–56. http://dx.doi.org/10.1115/1.1758255.

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This paper investigates the soft-finger contact by presenting the contact with a set of line springs based on screw theory, reveals the rotational effects, and identifies the stiffness properties of the contact. An elastic model of a soft-finger contact is proposed and a generalized contact stiffness matrix is developed by applying the congruence transformation and by introducing stiffness mapping of the line springs in translational directions and rotational axes. The effective stiffnesses along these directions and axes are hence obtained and the rotational stiffnesses are revealed. This hel

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Fleischmann, Dominique, and László Könözsy. "On a Novel Approximate Solution to the Inhomogeneous Euler–Bernoulli Equation with an Application to Aeroelastics." Aerospace 8, no. 11 (2021): 356. http://dx.doi.org/10.3390/aerospace8110356.

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This paper focuses on the development of an explicit finite difference numerical method for approximating the solution of the inhomogeneous fourth-order Euler–Bernoulli beam bending equation with velocity-dependent damping and second moment of area, mass and elastic modulus distribution varying with distance along the beam. We verify the method by comparing its predictions with an exact analytical solution of the homogeneous equation, we use the generalised Richardson extrapolation to show that the method is grid convergent and we extend the application of the Lax–Richtmyer stability criteria

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Pantel, Priya, and Swati Nagpal. "AYURVEDIC PROTOCOL FOR THE MANAGEMENT OF WILSON’S DISEASE – A CASE REPORT." International Ayurvedic Medical Journal 9, no. 7 (2021): 1593–96. http://dx.doi.org/10.46607/iamj4509072021.

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Wilson’s disease (hepatolenticular degeneration) is a rare important autosomal recessive disorder caused by dys- function of the copper transporter ATP7B, which leads to snagging in copper transport by the hepatic lysosomes resulted in the deposition of copper in the brain, liver, kidney, or skeletal system. The symptoms are jaundice, Kayser-Fleischer rings, dysarthria, ataxia, and muscle spasticity etc. Current therapeutic modalities for the manage- ment of Wilson's disease include zinc, trientine, penicillamine etc. In Ayurvedic classics there is no exact correlation is available for this di

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Venketasubramanian, Narayanaswamy, Manish Taneja, and David Choy. "Transcranial Doppler in the Detection and Management of Arterial Vasospasm after Aneurysmal Subarachnoid Haemorrhage." Case Reports in Neurology 12, Suppl. 1 (2020): 110–18. http://dx.doi.org/10.1159/000504469.

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Delayed cerebral ischaemia (DCI) and cerebral infarction is a much-feared complication of aneurysmal subarachnoid haemorrhage (aSAH). It has been largely attributed to focal hypoperfusion from reversible cerebral arterial narrowing, “vasospasm,” from the effects of prolonged exposure of the arteries to perivascular blood and oxy-haemoglobin. Transcranial Doppler (TCD) provides a non-invasive method for detecting and monitoring vasospasm. We report a 38-year-old lady who developed sudden dizziness and catastrophic generalised headache with neck pain (Pain Score 10/10) while voiding her bowels.

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Liu, Lang, Shusheng Bi, and Qizi Yang. "Stiffness characteristics of inner–outer ring flexure pivots applied to the ultra-precision instruments." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 13 (2017): 2441–57. http://dx.doi.org/10.1177/0954406217721725.

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The inner-outer ring flexure pivot (IORFP), composed of three straight springs that cross each other in space, is studied in this work. First, to emphasize the study value of IORFP, qualitative comparison is applied to IORFP and some of most commonly used flexure pivots. Then an analytical model for the rotational stiffness of IORFP is developed based on the strain energy formulation of a beam flexure, and model applicability is provided as well. Analysis of stiffness, buckling load, and the nonlinear of moment–rotation relation is then carried out. Subsequently, the analytical model is verifi

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