bluuebunny/crossref_metadata_2025_split huggingface dataset:
Primary site surgical resection in cM1 oral cavity squamous cell carcinoma
Authors: Patel Aman M. , Haleem Afash , Revercomb Lucy , Brant Jason A. , Rajasekaran Karthik , Sun Lova L. , Brody Robert M. , Carey Ryan M. 
Published: September 2024

AbstractObjectiveTo investigate primary site surgical resection and overall survival (OS) in clinically distantly metastatic (cM1) oral cavity squamous cell carcinoma (OCSCC).MethodsThe 2006–2018 National Cancer Database was queried for patients presenting with cM1 OCSCC who underwent chemotherapy. Binary logistic, Kaplan–Meier, and multivariable Cox proportional hazards regression models were implemented.ResultsOf 278 patients satisfying inclusion criteria, 139 (50.0%) underwent chemotherapy alone, 80 (28.8%) underwent chemoradiotherapy, 25 (9.0%) underwent surgical resection + adjuvant chemotherapy, and 34 (12.2%) underwent surgical resection + adjuvant chemoradiotherapy; 5‐year OS was 9.4%, 15.2%, 8.3%, and 23.8%, respectively (p < .001). Compared with those not undergoing surgical resection, patients undergoing surgical resection underwent radiotherapy more frequently (57.6% vs. 36.5%) but multiple‐agent chemotherapy less frequently (40.7% vs. 74.4%) (p < .005). Twenty‐one (36.2%) patients undergoing surgical resection had positive surgical margins. Academic facility (adjusted odds ratio [aOR] 3.19, 95% CI 1.54–6.62) and Charlson‐Deyo comorbidity score ≥1 (aOR 2.82, 95% CI 1.25–6.32, p < .025) were associated with increased odds of undergoing surgical resection. Compared with chemotherapy alone, chemoradiotherapy (adjusted hazard ratio [aHR] 0.56, 95% CI 0.38–0.83) and surgical resection + adjuvant chemoradiotherapy (aHR 0.37, 95% CI 0.21–0.66) were associated with higher OS (p < .005). Immunotherapy (aHR 0.48, 95% CI 0.28–0.81, p = .006) was also independently associated with higher OS.ConclusionA minority of patients with cM1 OCSCC underwent primary site surgical resection. Despite the high rate of positive surgical margins, surgical resection + adjuvant chemoradiotherapy was associated with higher OS than chemotherapy alone, chemoradiotherapy, or surgical resection + adjuvant chemotherapy. Definitive local therapy may benefit select patients with cM1 OCSCC.Level of evidence: 4.
Health literacy and diabetes information preferences among Chinese immigrants: An Australian cross‐sectional study
Authors: Lin Shanshan , Muscat Danielle , Ayre Julie 
Published: September 2024

AbstractAimExplore Australian‐Chinese immigrants' health literacy and preferences and engagement with translated diabetes self‐management patient education materials.DesignThe cross‐sectional survey was conducted with Australian‐Chinese immigrants at risk or with type 2 diabetes recruited via health services, and diabetes and community organisations.MethodsThe survey had three parts: (1) diabetes screening; (2) sociodemographic information, clinical characteristics and preferences for translated materials; and (3) Functional, Communicative and Critical Health Literacy (FCCHL) Scale.ResultsOf 381 participants, 54.3% reported diabetes (n = 207), the remainder pre‐diabetes or at risk (45.7%, n = 174); 34.1% male; mean age 64.1 years. Average total health literacy (FCCHL) scores were 35.3/56 (SD = 8.7). Participants with greater English proficiency reported higher health literacy (p < 0.001). This pattern also existed for functional (p < 0.001), communicative (p = 0.007) and critical (p = 0.041) health literacy subdomains. Health literacy scores did not differ significantly based on years of residence in Australia (all p > 0.05). Although the majority of participants (75.6%, N = 288) were willing to receive translated diabetes information, only a small proportion (19.7%, N = 75) reporting receiving such materials.ConclusionThere is a clear need for co‐designed diabetes patient education materials that meet the needs and adequately reach Australian‐Chinese immigrants. In particular, these materials must support people with limited English‐language proficiency.Implications for Nursing PracticeThis study highlights important considerations for nurses seeking to improve diabetes care for Chinese immigrants when incorporating patient education materials as part of their nursing education.
Compactness results for a Dirichlet energy of nonlocal gradient with applications
Authors: Han Zhaolong , Mengesha Tadele , Tian Xiaochuan 
Published: September 2024

AbstractWe prove two compactness results for function spaces with finite Dirichlet energy of half‐space nonlocal gradients. In each of these results, we provide sufficient conditions on a sequence of kernel functions that guarantee the asymptotic compact embedding of the associated nonlocal function spaces into the class of square‐integrable functions. Moreover, we will demonstrate that the sequence of nonlocal function spaces converges in an appropriate sense to a limiting function space. As an application, we prove uniform Poincaré‐type inequalities for sequence of half‐space gradient operators. We also apply the compactness result to demonstrate the convergence of appropriately parameterized nonlocal heterogeneous anisotropic diffusion problems. We will construct asymptotically compatible schemes for these type of problems. Another application concerns the convergence and robust discretization of a nonlocal optimal control problem.
SBFEM with perturbation method for solving the Reynolds equation
Authors: Pfeil Simon , Song Chongmin , Woschke Elmar 
Published: September 2024

AbstractRotordynamic simulations with nonlinear hydrodynamic bearing forces require a solution of the Reynolds equation at every time step. As a computationally efficient alternative to the standard numerical methods, a semi‐analytical solution based on the scaled boundary finite element method (SBFEM) was developed recently. Through a discretization of the hydrodynamic pressure (dependent variable) along the circumferential but not the axial coordinate, the partial differential equation is transformed into a system of ordinary differential equations. This system of differential equations is referred to as SBFEM equation and can be solved exactly if the influence of shaft tilting is neglected. In common numerical models, this influence can be taken into account without difficulties, but as far as this semi‐analytical approach is concerned, shaft tilting complicates the equations substantially. Therefore, previous studies on the SBFEM solution of the Reynolds equation were conducted without consideration of this effect. The formulation presented in the work at hand no longer requires this simplification. The terms representing the influence of shaft tilting in the SBFEM equation are handled by the perturbation method. The pressure field is expressed by a series expansion, where the solution of order correlates to the power of a perturbation parameter chosen proportional to the tilting angle. The differential equation governing the solution contains lower‐order solutions on its right‐hand side, implying a recursive computation of the series from lowest to highest order. A universal expression for the general solution is formulated, where only the coefficients and the maximum power of the axial coordinate differ for every . This allows the implementation of a general algorithm with no inherent limitation regarding the maximum order of perturbation. For verification, the pressure fields computed by the proposed method are compared to a numerical reference solution, showing that the series converges to the correct result for the investigated set of parameters.
Comparing frequentist and Bayesian uncertainty quantification in two‐step constitutive model calibration
Authors: Tröger Jendrik‐Alexander , Römer Ulrich , Hartmann Stefan 
Published: September 2024

AbstractThe calibration of constitutive models using experimental observations is a well‐established task in computational solid mechanics. Especially for complex constitutive models, multistep calibrations are regularly applied. While this approach is advantageous for reducing the complexity of the calibration problem, the quantification of parameter uncertainties becomes more challenging. In this study, we perform two‐step statistical parameter inference for an elasto‐plastic constitutive model utilizing a frequentist approach and Bayesian inference. The uncertainties are quantified by different methods, in particular, we compare an asymptotic normality analysis and Gaussian error propagation in the frequentist setting with sampling‐based Bayesian inference. Although frequentist and Bayesian parameter inference differ significantly in the way parameters are calibrated, both methods yield similar estimates. Additionally, the uncertainties quantified by asymptotic normality considerations and Gaussian error propagation are quite similar. However, the uncertainties of the elasticity parameters in the frequentist approach are found to be significantly smaller compared to Bayesian inference, due to the underlying approximations in the frequentist setting. Thus, uncertainties can be estimated in both settings, but it is crucial to be aware of the inherent assumptions and simplifications when interpreting the results.
Locally different models in a checkerboard pattern with mesh adaptation and error control for multiple quantities of interest
Authors: Endtmayer Bernhard 
Published: September 2024

AbstractIn this work, we apply multi‐goal oriented error estimation to the finite element method. In particular, we use the dual weighted residual method and apply it to a model problem. This model problem consist of locally different coercive partial differential equations in a checkerboard pattern, where the solution is continuous across the interface. In addition to the error estimation, the error can be localized using a partition of unity technique. The resulting adaptive algorithm is substantiated with a numerical example.
Implementation of a finite element framework coupling chemo‐mechanics and the Gurson‐Tvergaard‐Needleman model
Authors: Patil Siddhi Avinash , Prüger Stefan , Roth Stephan , Seupel Andreas , Kiefer Bjoern 
Published: September 2024

AbstractHydrogen embrittlement in ductile metals, such as steel, is a significant concern, for instance, in the safety assessment of existing pipeline infrastructure intended for hydrogen transport. The ductile damage mechanism in steels is characterized by the nucleation, growth, and coalescence of microvoids, which is further enhanced by the presence of hydrogen. This leads to material damage and premature failure in components. Mechanisms contributing to hydrogen‐induced reduction of strength in steels include hydrogen‐enhanced decohesion (HEDE), hydrogen‐enhanced local plasticity (HELP), and hydrogen‐enhanced strain‐induced vacancies (HESIV). The HEDE mechanism leads to a principal stress‐controlled brittle failure mode. Conversely, the HELP and the HESIV mechanisms, which are dominated by plastic deformation, alter the ductile damage behavior as they lead to accelerated void growth and coalescence. Furthermore, interstitial diffusion of hydrogen leading to lattice expansion, commonly referred to as swelling, also contributes to hydrogen‐induced embrittlement. Hydrogen embrittlement is therefore a stress‐diffusion process that involves chemo‐mechanical coupling, where hydrogen atoms primarily diffuse toward areas with high hydrostatic stress. In this regard, we propose a framework using the finite element method and combining coupled chemo‐mechanics and the well‐known Gurson‐Tvergaard‐Needleman (GTN) damage model. The framework is motivated by mixed rate‐type potentials, that account for the influence of hydrogen concentration on the damage behavior. An additional dependence of the fracture strain and evolution of the void volume fraction on hydrogen is included. A comparison of the fully‐coupled model to simplified versions is conducted to individually assess the role of hydrogen concentration on damage evolution and the stress state on diffusion.
Inductive mode selective damping of structural vibrations
Authors: Rosenboom Mitja , Hetzler Hartmut 
Published: September 2024

AbstractStructural vibrations pose significant challenges in various engineering applications and require effective damping strategies to improve the overall performance and longevity of systems. While some oscillations can significantly reduce the longevity of systems, others might contribute positively to the overall system performance. Thus, this contribution presents a novel method of an inductive damping concept, that targets only specific vibrational modes based on their mode shapes. By analyzing the used inductive damping element in the context of a single degree of freedom oscillator, it is shown, that it functions as an ideal viscous damper only if the dynamics of the electric part of the system are neglected. The concept of mode selective damping is presented, using two of these damping elements in an oscillator chain with three masses. By altering the wiring configurations connecting the two damping elements in the electrical domain, the damping behavior can be manipulated to selectively damp only specific modes according to their mode shapes.
Sound absorption properties and mechanism of multi‐layer micro‐perforated nanofiber membrane
Authors: Shao Xiaofei , Yan Xiong 
Published: September 2024

AbstractAiming at achieving low‐frequency and broadband sound absorption under the premise of light and thin layers, in this paper, polyvinyl butyral (PVB) nanofiber membranes were micro‐perforated and then combined sequentially to prepare multi‐layer micro‐perforated nanofiber membrane (MPNM) for acoustic noise reduction. It was demonstrated that the multi‐layer MPNM exhibited a high absorption (constantly over 50%) in the frequency of 480–2500 Hz. In addition, the established theoretical model of the sound absorbing coefficient can accurately predict the sound absorption performance of the structure with different layers, which can provide a theoretical foundation for the design of the structure of the nanofibrous membrane acoustic absorber. Based on the proposed acoustic model, the relationships between the absorption properties and the parameters were investigated, and it was found that the effective acoustic absorption frequency range and acoustic absorption coefficient curve of the multi‐layer MPNM were closely related to the size and arrangement of hole diameter, perforation rate, fiber membrane thickness, and cavity depth. Optimization of the structural parameters utilizing algorithms can achieve superior sound absorption performance, with an average absorption coefficient of 0.81 in the frequency of 100–2500 Hz. This study provides a theoretical and experimental basis for the development of low‐frequency sound‐absorbing materials and is of great significance for optimizing the acoustic performance of nanofiber membranes and expanding their applications in various acoustic engineering applications.
Understanding the compaction behavior of uncured thermoset prepreg: Experimental investigation and theoretical analyses
Authors: Yan Lei , Gong Bowen , Wang Shuyi , Cheng Baofa , Sun Cheng , Ouyang Wenting , Wang Huan , Peng Hua‐Xin 
Published: September 2024

AbstractThe deformation behavior of uncured thermoset prepreg during hot compaction process was investigated by dividing the whole compaction process into an initial compression stage and the subsequent creep stage. At the compression stage, there existed a strain‐softening phenomenon in the temperature range of 50–90°C, indicating different deformation behavior that is mainly determined by the viscosity of prepreg. Following an appraisal of advantages and limitations of existing compaction models, a combination model consisted of a modified power‐law model including the influence of temperature and the generalized Kelvin‐Voigt model was proposed to describe the deformation behavior of prepreg during compression and creep stage, respectively. Finally, a discussion on the compaction mechanism was conducted to offer some insights into the deformation process.Highlights
Strain‐softening phenomenon occurred during the compaction of uncured prepreg.
Proposed combination model captures the deformation of uncured prepreg well.
The percolation mechanism dominates prepreg deformation during compaction.
The squeeze flow mechanism causes limited thickness reduction of prepreg.
Progressive damage and stiffness degradation assessments of double‐lap CFRP/Ti interference fit bolted joints under quasi‐static tensile load
Authors: Zuo Yangjie , Wang Zhiguo , Jiao Yunlei , Pei Xin 
Published: September 2024

AbstractMatrix crack propagation and stiffness degradation behaviors of the carbon fiber reinforced polymer/titanium alloy (CFRP/Ti) bolted joint were characterized by a synergistic damage mechanics approach. The parametric study including pre‐tightening torques and interference fit sizes was conducted. The results showed that the joint stiffness degradation exhibited characteristics of local stiffness degradation due to local stress concentration. Stiffness degradation in different plies was caused by matrix crack damage occurring in different directions. The pre‐tightening torque significantly increased the joint stiffness and restrain matrix crack progression, effectively inhibiting the stiffness degradation of the joint. Moreover, the low interference fit level delayed the crack initiation in −45° ply and 45° ply and the crack propagation of the laminate, while promoted the crack initiation in 90° ply. The stiffness degradation of the laminate could be significantly reduced by interference fit.Highlights
Matrix crack propagation and stiffness degradation behaviors of the CFRP laminate were characterized by a synergistic damage mechanics method.
A FE model of the CFRP/Ti double‐lap interference fit bolted joint was established.
Influences of pre‐tightening torques on both matrix crack initiation and propagation were investigated.
The optimum interference fit size of the matrix damage strengthening was 0.20%–0.60%.
Direct printing of carbon fiber reinforced thermoplastic plastic on metal sheets via fused deposition modeling assisted by laser texturing
Authors: Wang Shijia , Liu Yifan , Qin Chunlin , Su Jianhui , Deng Yunhua , Song Wei , Chen Bo , Song Xiaoguo , Tan Caiwang 
Published: September 2024

AbstractPrinting polymers on metal surfaces using fused deposition modeling could enhance the versatility of hybrid structures. However, the differences between metals and plastics prevented the effective spreading of molten plastic on metal surfaces, challenging reliable plastic printing on metal substrates. This study employed a nanosecond laser to fabricate laser‐textured grids of varying widths (0.2–0.5 mm) on a 6061 aluminum alloy (6061Al) surface. Carbon fiber reinforced thermoplastic plastic (CFRTP) was printed on 6061Al surface in different printing directions (0°, 45°, and 90°). The influence of laser texturing and printing direction on joint performance was evaluated. The findings indicated the laser‐texturing increased 6061Al surface roughness, enhancing wettability of CFRTP on 6061Al surface. The 45° printing direction provided the best wetting, resulting in a tensile‐shear force of 1631.7 N, 218% higher than at 90°. Optimal performance was achieved with a 0.5‐mm texture width, increasing tensile‐shear force by 180% compared to 0.2 mm and 67% compared to 0.6 mm. Interfacial stress concentration decreased and then increased with the increase of laser‐textured width and the 45° printing direction provided the longest print path and best resin spreading. This research presented a novel approach to metal‐polymer joining, with significant implications for advanced lightweight hybrid structures.Highlights
Printing carbon fiber reinforced thermoplastic plastic (CFRTP) on 6061 aluminum alloy (6061Al) surface was achieved by fused deposition modeling via laser texturing.
The print direction affected the wetting and spreading space of the molten resin.
Pinning effect of printed CFRTP/6061Al by laser texturing was studied.
The spreading and wetting of resin determined the mechanical properties.
Molecular dynamics simulations of the micro mechanism of functionalized SiO2 nanoparticles and carbon nanotubes modified epoxy resin adhesives
Authors: Li You , Li Hongyi , Song Chengjun , Zhu Ziming , Ma Xiaowan 
Published: September 2024

AbstractThe bonding interface of carbon‐fiber‐reinforced polymer (CFRP)‐reinforced steel structure is a weak part, and nanomaterial‐modified adhesives are expected to improve its comprehensive performance. This paper investigates the micro‐modification mechanisms of nanomaterials on epoxy resin adhesives using molecular dynamics simulation method. It explores how the functionalized nano SiO2 and carbon nanotubes affects the thermal and mechanical properties of the epoxy resin adhesive. The models established using Materials Studio software include the pure epoxy resin adhesive model (EP) with varying degrees of crosslinking, the functionalized nano‐SiO2‐modified epoxy resin adhesive model (EP + SiO2/OH), the single‐walled carbon nanotube‐modified epoxy resin adhesive model (EP + SWNT), and the synergistic enhancements model of the epoxy resin adhesive with nano‐SiO2 and carbon nanotubes (EP + SWNT + SiO2/OH). Based on the aforementioned models, the Forcite module is used to calculate the free volume, glass transition temperature and mechanical properties of the adhesive. The results show that the degree of crosslinking effects significantly the mechanical performance of epoxy resin adhesive. A high degree of crosslinking restricts the movement of the molecular chain, enhancing the strength of the epoxy resin adhesive. Furthermore, the trend of the mechanical and thermal properties of the four models remains constant with the rise of temperature, and the properties decrease most significantly in the range of the glass transition temperature. Moreover, the epoxy resin adhesive doped with nanomaterials exhibits varying degrees of enhancement in mechanical and thermal properties. The epoxy resin adhesive reinforced with functionalized nano‐SiO2 and carbon nanotubes exhibits better properties compared to those with a single nanomaterial.Highlights
The micro‐modification mechanism is revealed for nanomaterial modified epoxy resin adhesive.
The degree of crosslinking effects significantly the mechanical performance of epoxy resin adhesive.
The epoxy resin adhesive doped with nanomaterials exhibits varying degrees of enhancement in mechanical and thermal properties.