Deformable Models - Science topic

This study introduces a new convergence simulation procedure for representing the softening–melting behavior of reduced sinter at a higher resolution in the cohesive zone by incorporating the inner structure obtained by X-ray computed tomography. Boundary conditions for the actual sinter shape, including internal voids, were integrated into a dynam...

Generative Adversarial Networks (GANs) have gained prominence in refining model fitting tasks in computer vision, particularly in domains involving deformable models like Active Appearance Models (AAMs). This paper explores the integration of GANs to enhance the AAM fitting process, addressing challenges in optimizing nonlinear parameters associate...

This work explores the bending responses of functionally graded graphene platelet-reinforced ceramic–metal (FG-GPLRCM) plates on Kerr substrates within an integral higher-order shear deformation theory framework. The theory accurately observes zero stresses on the plate's top and bottom surfaces, satisfies boundary conditions, and obviates the requ...

Interseismic deformation in the Pacific Northwest is constrained by the horizontal crustal velocity field derived from the Global Positioning System (GPS) in addition to vertical rates derived from GPS, leveling, and tide gauge measurements. Such measurements were folded in to deformation models of fault slip rates as part of the 2023 National Seis...

Generative Adversarial Networks (GANs) have gained prominence in refining model fitting tasks in computer vision, particularly in domains involving deformable models like Active Appearance Models (AAMs). This paper explores the integration of GANs to enhance the AAM fitting process, addressing challenges in optimizing nonlinear parameters associate...

The clap-and-fling mechanism, initially discovered in insect flight, has been widely adopted in Flapping-Wing Micro Air Vehicle (FWMAV) designs to enhance their lift generation. Unlike rigid wings, artificial FWMAV wings exhibit distinct deformation characteristics due to their unique material properties and structural features. These wings rely on...

Enhanced simulation capability for the cutting process is crucial to making quick evaluations of cutting forces and temperatures, which are significant for assessing the machinability of the workpiece material and predicting tool wear. In this paper, the material flow in orthogonal cutting, including primary and secondary shear zones, is represente...

In this work, an analytical tire deformation model is created, which can be parameterized using simple measurements. The model consists of three equations which are solved to provide a shape function for the tire.This model can be used to provide excitation input for energy harvesters embedded inside the tire for example in FEM simulations. Additio...

We explore a deformation of the flat space symmetric space sigma model action. The deformed action is designed to allow a Lax connection for the equations of motion, similar to the undeformed model. For this to work, we identify a set of constraints that the deformation operator, which is incorporated into the action, must fulfil. After defining th...

Estimating accurate high-dimensional transformations remains very challenging, especially in a clinical setting. In this paper, we introduce a multiscale parameterization of deformations to enhance registration and atlas estimation in the large deformation diffeomorphic metric mapping framework. Using the Haar wavelet transform, a multiscale repres...

Background Different patterns of atrophy exist in the dementia stage of AD. However, little is known about the heterogeneity of atrophy patterns and the mechanisms that drive subsequent propagation of the disease in the preclinical stages. Method From the AMYPAD‐PNHS cohort, we included a total of 1323 non‐demented individuals, including 1094 amyl...

THIS IS A RESUBMISSION OF A PREVIOUSLY SUBMITTED ABSTRACT ALREADY ACCEPTED, NEEDED FOR FELLOWSHIP APPROVAL Background Different patterns of atrophy exist in the dementia stage of AD. However, little is known about the heterogeneity of atrophy patterns and the mechanisms that drive subsequent propagation of the disease in the preclinical stages. M...

Background Different patterns of atrophy exist in the dementia stage of AD. However, little is known about the heterogeneity of atrophy patterns and the mechanisms that drive subsequent propagation of the disease in the preclinical stages. Method From the AMYPAD‐PNHS cohort, we included a total of 1323 non‐demented individuals, including 1094 amyl...

Accurate prediction of normal contact behavior for rock joints is essential for understanding the interfacial physical properties and multi-physics coupling processes within jointed rock masses. However, the available Hertzian-based contact models generally overlook the effects of elastoplastic and full plastic deformation across the whole topograp...

We propose WS-DeepSfT, a novel deep learning-based approach to the Shape-from-Template (SfT) problem, which aims at reconstructing the 3D shape of a deformable object from a single RGB image and a template. WS-DeepSfT addresses the limitations of existing SfT techniques by combining a weakly-supervised deep neural network (DNN) for registration and...

This study examines the unruptured portion of the Pütürge segment, the least-studied section of the East Anatolian Fault System (EAFS) in southeast Türkiye, focusing on the S¸iro Valley to comprehensively understand the observed distribution in deformation. Despite the February 6, 2023 doublet earthquakes, the Pütürge segment near the S¸iro Valley...

Gait recognition is a biometric technology that identifies individuals based on the unique characteristics of their gait. With the advancement of deep learning based computer vision technology, gait recognition has significantly improved in performance and gained significant attention due to its non-invasive nature. This paper proposes a vision-bas...

Rubber composite sleepers can experience significant temperature variations in service, causing temperature-induced deformation. Real-time monitoring of this deformation is crucial for operational safety and maintenance; however, it is costly, time-consuming, and requires substantial resources and personnel. Developing temperature-dependent predict...

Modelling anchor movement in marine clay presents significant challenges. Marine clay typically exhibits strain-softening behaviour, complicating traditional continuum models due to mesh dependency issues. Additionally, the clay surrounding an anchor undergoes significant geometric changes, leading to mesh distortion when using conventional finite...

Around the periphery of the Greenland ice sheet, satellite-based observations of ground uplift record Earth’s response to past and recent unloading of Greenland’s ice mass. On the southeast coast, near the Kangerlussuaq glacier, rapid uplift exceeding 12 mm/yr cannot be explained using current layered Earth deformation models. Here we find that 3D...

In this paper, a bionic thin-walled tube structure with a ponytail stem, a fractal structure of branches, and a honeycomb structure was designed and fabricated by additive manufacturing (AM) technology using NiTi alloy as the substrate. In the quasi-static compression test, the energy absorption (EA) ability, deformation model, and shape memory eff...

В работе проведено теоретическое исследование механических свойств кристаллической структуры целекоксиба (4-[5-(4-метилфенил)-3-(трифторметил)-пиразол-1-ил]бензолсульфонамида) для полиморфной модификации III (ПГ P–1). Для этого было произведено моделирование возрастающей одноосной деформации структуры кристалла по трём осям кристаллической ячейки....

Постановка задачи. Применение композитной стержневой арматуры в бетонных конструкциях является перспективным направлением в строительной практике, однако до настоящего времени не разработано единого научно обоснованного подхода к их расчету. Целью работы является рассмотрение возможности применение деформационной модели для расчета параметров напря...

Coalbed methane drainage through surface wells has become increasingly important in high-gas mines. Surface wells are prone to different types of deformations and failures owing to mining-induced effects. In this paper, a displacement and deformation model was established for the overlying strata. Three forms of deformation and failure of the surfa...

Data-driven deformable image registration methods predominantly rely on operations that process grid-like inputs. However, applying deformable transformations to an image results in a warped space that deviates from a rigid grid structure. Consequently, data-driven approaches with sequential deformations have to apply grid resampling operations bet...

In order to ensure reliability of structures, it is necessary to study equilibrium damage accumulation which initiates softening zones in solids. It is considered appropriate to use postcritical deformation models when conducting strength analysis of structures. However, obtaining complete stress-strain curves in standard tests is difficult due to...

We investigate the trans-series structure of a quantum mechanical system originating from a Lie-algebraic K\"ahler sigma model with multiple right-handed chiral fermions, extending previous results for the standard onecomplex projective ($\cp^1$) model [1],[2] to its deformed counterpart. We identify and analyze saddle point solutions and examine t...

Surface deformation is an important tool for studying active volcanoes. Numerical deformation models can consider irregular features like crustal heterogeneity and avoid biases due to oversimplification. Dynamic elastic moduli can be derived from seismic velocities, but the static moduli apply to deformation studies since strain amplitudes and time...

In this paper, we focus on the challenges of modeling deformable 3D objects from casual videos. With the popularity of NeRF, many works extend it to dynamic scenes with a canonical NeRF and a deformation model that achieves 3D point transformation between the observation space and the canonical space. Recent works rely on linear blend skinning (LBS...

Plant zygote cells exhibit tip growth, producing a hemisphere-like tip. To understand how this hemisphere-like tip shape is formed, we revisited a viscoelastic–plastic deformation model that enabled us to simultaneously evaluate the shape, stress and strain of Arabidopsis ( Arabidopsis thaliana ) zygote cells undergoing tip growth. Altering the spa...

Optimization of fabric’s mechanical properties, such as strength and bagging deformation of worsted fabrics, is considered one of the most important cases in relation to the use of stenter machine. Because, in this machine, for providing fabric’s dimensional stability with drying and stretching operations, fundamental changes would occur in these p...

This paper discusses the applicability of a nonlinear deformation model for determining the parameters of the stress-strain state of eccentrically compressed concrete-filled steel tube elements. Adjustments to the deformation diagrams of the concrete core and the steel tube were introduced to account for the complex stress state of the materials. T...

We introduce a novel, data-driven approach for reconstructing temporally coherent 3D motion from unstructured and potentially partial observations of non-rigidly deforming shapes. Our goal is to achieve high-fidelity motion reconstructions for shapes that undergo near-isometric deformations, such as humans wearing loose clothing. The key novelty of...

The linear heating and formation of steel plates is one of the most critical technologies in shipbuilding. Excellent technology not only provides good hydrodynamics for the hull but also affects the whole hull construction cycle and cost. In the heating and formation of a steel plate, the material, size, and thickness of the steel plate; heating te...

The vibration caused by blasting excavation of rock mass frequently poses a threat to the stability of adjacent tunnels. Previous research is limited by the simplification of a rock mass as a homogeneous elastic medium, without considering the wave attenuation caused by viscoelasticity and wave separation induced by rock discontinuities, as well as...

The purpose of research is to justify a calculation method for a stay rope of composite fiber structure with a breakage in fiber continuity. Research methodology is in constructing and solving a deformation model of a composite fiber stay rope with continuity breakage of one of its fibers. The calculation method of a stress-strain state of a stay r...

The Qilian Mountains, located on the northeastern edge of the Qinghai–Tibet Plateau, are characterized by unique high-altitude and cold-climate terrain, where permafrost and seasonally frozen ground are extensively distributed. In recent years, with global warming and increasing precipitation on the Qinghai–Tibet Plateau, permafrost degradation has...

Applying polypoint transformation to a triangle mesh is a promising technique that deserves extensive exploration. Unlike traditional deformation techiques used in 3D animation that are based on spatial interpolation, polypoint transformation transforms not a set of points or mesh vertices, but a polyfiber — a set of planes that form an object of t...

This study presents an advanced quadrilateral finite element model for analyzing the free vibration behavior of functionally graded carbon nanotube-reinforced (FG-CNTRC) nanocomposite plates. The proposed element, derived from the classical four-node Q4 element, incorporates a discrete shear projection method to evaluate transverse shear deformatio...

Advancements in the quantitative investigation of fluvial topography in tectonically active regions account for the emerging numerical modelling of river profiles and their linear inversions. Applications of a geomorphic approach strive for the reconstruction of long-term tectonic deformation histories by decoding base-level fall signals transientl...

The unique building of the National Library of the Republic of Belarus includes not only urban planning, architectural, technological modern solutions, but also structural ones. One of such modern structural solutions is the use of composite (steel-concrete) structural elements. The advantages of steel-reinforced concrete structures are manifested...

Volcano deformation models contribute to hazard assessment by simulating magma system dynamics. Traditional magma reservoir pressure source shape assumptions often fail to replicate irregular, geophysically identified geometries. Uncertainties regarding the influence of reservoir geometry can limit the effectiveness of using deformation models to d...

Accurate prediction of concrete dam deformation is essential for ensuring structural safety and operational efficiency. This study presents a novel approach for monitoring and predicting concrete dam deformation using observed air temperature data, intelligent optimization, and machine learning techniques. To address the limitations of traditional...

Multi-planar tagged MRI is the gold standard for regional heart wall motion evaluation. However, accurate recovery of the 3D true heart wall motion from a set of 2D apparent motion cues is challenging, due to incomplete sampling of the true motion and difficulty in information fusion from apparent motion cues observed on multiple imaging planes. To...

Numerical investigations of capped T-ring (CTR) seals performance in reciprocating motion for landing gear shock absorber applications are presented. A lubrication model using the Elastohydrodynamic lubrication theory and deformation mechanics is developed in a multi-material contact zone, and a procedure for coupling fluid and deformation mechanic...

The accurate prediction of dam deformation is essential for ensuring safe and efficient dam operation and risk management. However, the nonlinear relationships between deformation and time-varying environmental factors pose significant challenges, often limiting the accuracy of conventional and deep learning models. To address these issues, this st...

We construct a plethora of type-II supergravity solutions featuring AdS factors in their geometries, derived from integrable deformations of coset CFTs. Specifically, we uplift the $\lambda$-deformed models of $SO(4)_k/SO(3)_k$ and $SO(5)_k/SO(4)_k$, including the non-compact version of the latter. Requiring reality for the backgrounds imposes boun...

In previous studies of the flow inside the pulmonary acinus, the deformation of acinus was limited because a relatively simple deformation methods, such as self-similar deformation, is used. However, acinus deformation may be complex and heterogeneous. The purpose of this study is to evaluate the influence of the difference in wall deformation betw...

In recent years, land subsidence has become a crucial factor affecting urban safety and sustainable development, especially inWan’an Town. To accurately monitor and analyze the land subsidence inWan’an Town, this study uses the PS-InSAR technique combined with an improved DEM for detailed research on land subsidence inWan’an Town. PS-InSAR, or Perm...

The question of the applicability of a nonlinear deformation model for the calculation of bent tubular concrete elements with round pipes is considered. A criterion for the destruction of a bent tubular concrete element without limiting concrete deformations during compression is proposed. The advantage of this failure criterion is the possibility...

We present a coarse-to-fine neural deformation model to simultaneously recover the camera pose and the 4D reconstruction of an unknown object from multiple RGB sequences in the wild. To that end, our approach does not consider any pre-built 3D template nor 3D training data as well as controlled illumination conditions, and can sort out the problem...

We present ViTaM-D, a novel visual-tactile framework for dynamic hand-object interaction reconstruction, integrating distributed tactile sensing for more accurate contact modeling. While existing methods focus primarily on visual inputs, they struggle with capturing detailed contact interactions such as object deformation. Our approach leverages di...

Numerical analyses based on deformation modelling are becoming customary in assessing tailings dam vulnerability. These methods consider the generation of excess pore pressure due to undrained shear of contractive materials, driving portions of the dam beyond the instability line, triggering the undrained softening process leading to flow liquefact...

Хохлов А.В., Гулин В.В. Влияние эволюции структуры и уровня нагрузки на свойства кривых ползучести и восстановления, порождаемых нелинейной моделью деформирования тиксотропных вязкоупругопластичных сред // Физическая мезомеханика. 2024. Т.27, №5. С.77-103. This paper continues the systematic analytical study of the properties of the previously con...

In this paper, we show that the Cutkosky cutting rules are still valid term by term in the expansion in powers of κ of the κ -deformed 1-loop correction to the propagator of the κ -deformed complex scalar field. We first present a general argument which relates each term in the expansion to a nondeformed amplitude containing additional propagators...

The traditional underactuated grippers can only passively adapt to the contour of the object, and the passive contact process may lead to the object slipping, affecting the stability of the grasping process. In this paper, an anthropomorphic modular gripper finger actuated by antagonistic wire and shape-memory alloy (SMA) springs, which can activel...

It is crucial for many applications to detect bearing damage as early as possible to allow for scheduling of maintenance with lead times that minimize operational disruption. State of the practice is the detection of spalling but damage initiates prior to spalling as subsurface and surface cracks. Such damage is much harder to detect and to model....

This paper aims to analyse the free vibrations of doubly-curved imperfect shear deformable functionally graded material microshells via a five-parameter shear deformable model. Porosity is modelled via the modified power-law rule by a logarithmic-uneven variation along the thickness. Coupled axial, transverse, and rotational motion equations for ge...

The applications of piezoelectric materials in the field of smart structures have received significant attention from both the communities of science and engineering. Numerous experimental studies have been carried out to endow smart structures with good flexibility. The flexible/stretchable piezoelectric materials are developed to fit this emergin...

Plain Language Summary Based on space geodetic observations, authors have obtained the locking state of large faults. However, the controlling mechanism that affects the lateral variation of fault locking is still poorly understood. In this study, we use a viscoelastic deformation model and GNSS data to infer the locking state of the Xiaojiang faul...

Respiratory-induced tumor motion presents a critical challenge in lung cancer radiotherapy, potentially impacting treatment precision and efficacy. This study introduces an innovative, deep learning-based approach for real-time, markerless lung tumor tracking utilizing orthogonal X-ray projection images. It incorporates three key components: (1) a...

In recent years, there has been rapid development in magnetic soft continuum robots (MSCRs). MSCRs are facilitated by the uniform dispersion of hard magnetic material particles within elastomers, serving as the actuating source. The external magnetic field interacts with the hard magnetic material to produce magnetic force and/or torque, leading to...

We propose a zero-shot text-driven 3D shape deformation system that deforms an input 3D mesh of a manufactured object to fit an input text description. To do this, our system optimizes the parameters of a deformation model to maximize an objective function based on the widely used pre-trained vision language model CLIP. We find that CLIP-based obje...

Vision foundation models trained on massive amounts of visual data have shown unprecedented reasoning and planning skills in open-world settings. A key challenge in applying them to robotic tasks is the modality gap between visual data and action data. We introduce differentiable robot rendering, a method allowing the visual appearance of a robot b...

Accurate 3D reconstruction of dynamic surgical scenes from endoscopic video is essential for robotic-assisted surgery. While recent 3D Gaussian Splatting methods have shown promise in achieving high-quality reconstructions with fast rendering speeds, their use of inverse depth loss functions compresses depth variations. This can lead to a loss of f...

The integration of biomimetic principles into the sophisticated design of honeycomb structures has gained significant traction. Inspired by the natural reinforcement mechanisms observed in tree stems, this research introduces localized thickening to the conventional honeycombs, leading to the development of variable-density honeycomb blocks. These...

Purpose The geological conditions of Longyang Reservoir are complex and it is located in strong earthquake area. In order to determine its seismic characteristics, the seismic response and residual deformation of embankment dam should be studied to provide calculation basis for dam design and construction. Design/methodology/approach Based on the...

Since 1991, the International Terrestrial Reference Frame (ITRF) includes the global time evolution of station positions (velocities) in addition to the three-dimensional Cartesian station positions at a fixed reference epoch. The orientation of the velocities refers to a kinematic model of rigid tectonic plates derived from geophysical observation...

Deformable object shape control involves the autonomous manipulation of deformable objects so that they acquire a desired target shape. This constitutes a vast challenge due to the wide variety of deformable object types and manipulation methods. The multidisciplinary nature of shape control spans fields such as deformable solid mechanics, control...

Continuum robots (CRs) have drawn increasing attention owing to their unique ability to operate in constrained environments. However, due to the deformability and compliant structures of CRs, parametric uncertainties and disturbances always exist in the CR system, which makes it a challenge to design high-performance controllers using conventional...