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Last Updated: 21 August 2022

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Wave-Current Blockage: Reduced Forces for the Re-Assessment of Ageing Space-Frame Offshore Structures

Abstract This paper summarizes extensive study on the accurate estimation of extreme loads from waves and current on space-frame offshore structures. This is a minor change to the original Morison equation, which forecasts forces using the undisturbed open ocean flow properties. Unsteady big waves on top of a steady current creates more blockage, which can be described as wave-current blockage. This paper introduces a numerical Computation Fluid Dynamics simulation of a porous block with embedded Morison drag and inertia stresses distributed over the space-frame's enclosed volume as a global representation. The standard Morison equation is used at a local member level, but not on the local level. This new technology can be useful in determining the overall structural load resistance and stability of extreme wave and current conditions, when survivability is in question. These experiments were conducted on both a jacket and the same model that were restrained on springs to simulate structural dynamics. To recreate the complete total force-time histories on the jacket model, you'll need a single pair of values of Morison drag and inertia coefficients for a jacket structure under all types of wave and current conditions. Different Morison drag coefficients are usually used in order to fit the measured peak forces in a variety of situations in comparison to the current industry standard, whereby different Morison drag coefficients are required. For the static tests, we find that the Morison equation for space-frame structures is accurate for dynamically sensitive structures.

Source link: https://doi.org/10.4043/29036-ms


Detection of Space-Time Disease Clusters Using A Matrix Factorization Method

In order to develop disease control and epidemiology, space-time cluster detection has significant applications in public health management and epidemiology to develop disease control protocols and determine the source of a specific disease outbreak in a region. This paper developed a new way to locate the earliest space-time clusters with no limitations on cluster size or size, and it was also illustrated more distinctly on the heat map.

Source link: https://doi.org/10.52700/scir.v4i1.78


Occipital and external acoustic meatus to axis angle: a useful predictor of oropharyngeal space in rheumatoid arthritis patients with atlantoaxial subluxation

However, O-C2a is unreliable in atlantoaxial subluxation because it does not reflect the translational movement of the cranium to C2, which is another factor affecting oropharyngeal area in patients with rheumatoid arthritis with reduced AAS. The authors previously argued that the occipital and external acoustic meatus would axis angle as a novel, useful, and accurate predictor of the anterior-posterior narrowest oropharyngeal airway space distance in healthy individuals. In AAS patients with AAS, the aim of the current study was to clarify the reliability of O-EAa as an indicator of oropharyngeal airway space. Patients were divided into 2 groups according to the presence of AAS and mobility: group N, patients without AAS; and group R, patients with reduced AAS during dynamic cervical mobility. Group N had a significantly lower AADI and O-EAa than group R, with only the extension position in sight.

Source link: https://doi.org/10.3171/2019.3.spine181390


Updating superficial siderosis of the central nervous system: bleeding of a dorsal osteophyte into the subarachnoid space from a perforating artery

The central nervous system's metabolic siderosis is unusual and often undiagnized disorder that results from recurrent and persistent bleeding into the subarachnoid space. The most effective treatment is still the diagnosis and surgical resolution of bleeding, but the source of bleeding is often not apparent. An association of chronic bleeding in the CNS and dural abnormalities in the spine has recently been proposed. The present case concerns a 48-year-old man who presented with persistent signs of mild hearing loss and mild gait ataxia for a long time. A small calcific osteophyte was discovered in T8's anterior epidural space, which is approximately 3,000 years old. MRI and CT revealed a small calcific osteophyte in the anterior epidural space of T8'u20139. The patient underwent surgical removal of the bone spur and dural tear repair, according to the patient. In SSCNS' latest research, a pervasive artery on an osteophyte bleeding into a subarachnoid space has never been described.

Source link: https://doi.org/10.3171/2018.7.spine18300


Efficient estimation of boundary integrals for path-space differentiable rendering

Boundary integrals are unique to physics-based differiable rendering and are essential for distinguishing with respect to object geometry. The boundary components are themselves path integrals under the differential path integral framework, which has allowed the development of advanced differentiable rendering algorithms. Historically, although the mathematical formulation of boundary path integrals has been established, accurate estimation of these integrals remains difficult. We introduce a new method to accurately estimate boundary path integrals in this paper. In addition, multiple importance samplings can be used to combine multiple guided samplings.

Source link: https://doi.org/10.1145/3528223.3530080


Dynamic optimal space partitioning for redirected walking in multi-user environment

The space subdivision scheme divides a shared physical space into sub-spaces and assigns a sub-space to each user in multi-user Redirected Walking. We recommend Optimal Space Partitioning, a space subdivision system that dynamically divides the shared physical space in real time to address this challenge in this report. By minimizing the number of reset counts, we show that OSP provides a greater sense of immersion to users, while also preserving the benefits of the existing space subdivision scheme: completely eliminating the possibility of any user collisions before.

Source link: https://doi.org/10.1145/3528223.3530113


3-D data-space joint inversion of gravity and magnetic data using a correlation-analysis constraint

We present an effective software for 3D correlation analysis joint inversion of gravity and magnetic data with high accuracy and low computation effort in this paper. Firstly, since the number of observed field measurements for joint inversion of gravity and magnetic measurements in model space is smaller than the number of inverted parameters, the calculation of the correlation-analysis for joint inversion of gravity and magnetic data in model space is converted into equivalent results in data space, which can reduce the number of the calculation domain, increase the computation accuracy, and minimize the non-uniqueness.

Source link: https://doi.org/10.4401/ag-8750


Edentulous ridge space closure after bone augmentation using different graft materials: A report of two cases

Abstract Post-extraction alveolar ridge resorption is a common sequelae when missing mandibular molar spaces are not addressed in a timely manner. Two cases were reported in the present article, in which different bone augmentation graft materials were used and treatment duration and post-orthodontic alveolar ridge characteristics were compared, two cases were reported. Both autogenous bone graft and allograft ridge augmentation techniques aided in the successful molar protraction through the resorbed mandibular alveolar ridge, as well as avoiding periodontal attachment loss.

Source link: https://doi.org/10.21307/aoj-2022.002


Interlabial gap and freeway space at rest position: a cephalometric study

Objectives of this paper The aim of this prospective study was to determine the cephalometric shifts from MIP to RP according to the amount of ILG and FWS, as well as gender, age, and skeletal structure, as well as skeletal pattern, as well as the number of interlabial gaps and freeway space at rest position, according to gender, age, and skeletal structure, as well as skeletal structure, and skeletal structure, as well as how to determine the cephalometric measurements at maximum interl In Class III than in Class I and Class II cases, the FWS was noticeably higher in Class III than in Class I and Class II cases. As overjet and upper lip to the aesthetic line increased at MIP, the ILG at RP increased. The lip-compete group had the highest frequency distribution in the small ILG and FWS groups, while smile line frequency distribution showed no correlation with the level of ILG and FWS. Conclusions Taking cephalometric measurements at RP would be able to analyze the ILG and FWS more accurately and help ensure a more accurate diagnosis and treatment strategy.

Source link: https://doi.org/10.21307/aoj-2021.027

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions