An assembly robot needs to be capable of executing an assembly task robustly under various *** attain this goal,we use a task sequence tree model originally proposed for manual *** model regards an assembly task under...
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An assembly robot needs to be capable of executing an assembly task robustly under various *** attain this goal,we use a task sequence tree model originally proposed for manual *** model regards an assembly task under uncertainties as a transformation of the contact state *** concept may contain several contact states with probabilities but these are transformed through a series of task elements into the contact state concept having only the goal state at the *** transformed contact state concept can be classified according to the terminal condition of each task ***,the whole assembly task can be designed as a tree-shaped contingent strategy called a task sequence *** paper proposes a systematic approach forreconfiguring a task sequence tree model for application to a robotic assembly *** addition,by taking a 2d peg-in-hole insertion task to be performed by a robot equipped with a force sensor as an example,we confirm that the proposed approach can provide a robust motion strategy for the task and that the robot can actually execute the task robustly under bounded uncertainty according to the strategy.
Amyloid cross-seeding of different amyloid proteins is considered as a highly possible mechanism for exacerbating the transmissible pathogenesis of protein misfolding disease(PMds)and for explaining a molecular link b...
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Amyloid cross-seeding of different amyloid proteins is considered as a highly possible mechanism for exacerbating the transmissible pathogenesis of protein misfolding disease(PMds)and for explaining a molecular link between different PMds,including Alzheimerdisease(Ad)and type 2 diabetes(T2d),Ad and Parkinson disease(Pd),and Ad and prion *** them,Ad and T2d are the most prevalent PMds,affecting millions of people globally,while Ab and hIAPP are the causative peptides responsible for Ad and T2d,*** clinical and epidemiological evidences lead to a hypothesis that the cross-seeding of Ab and hIAPP is more biologically responsible for a pathological link between Ad and *** this review,we particularly focus on(i)the most recent and important findings of amyloid cross-seeding between Ab and hIAPP from in vitro,in vivo,and in silico studies,(ii)a mechanistic role of structural compatibility and sequence similarity of amyloid proteins(beyond Ab and hIAPP)in amyloid cross-seeding,and(iii)several current challenges and future research directions in this lessstudied *** of amyloid cross-seeding hopefully provides some mechanistic understanding of amyloidogenesis and inspires more efforts for the betterdesign of next-generation drugs/strategies to treat different PMds simultaneously.
The hot deformation anddynamic recrystallization (drX) behavior of austenite-based Fe-27Mn-ll.5A1- 0.95C steel with a density of 6.55 g cm-3 were investigated by compressive deformation at the temperature range of ...
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The hot deformation anddynamic recrystallization (drX) behavior of austenite-based Fe-27Mn-ll.5A1- 0.95C steel with a density of 6.55 g cm-3 were investigated by compressive deformation at the temperature range of 900-1150 ℃ and strain rate of 0.01-10 s-1. Typical drX behavior was observed under chosen deformation conditions and yield-point-elongation-like effect caused by drX of 6-ferrite. The flow stress characteristics were determined by drX of the 6-ferrite at early stage and the austenite at later stage, respectively. On the basis of hyperbolic sine function and linear fitting, the calculated thermal activation energy for the experimental steel was 294.204 kJ mo1-1. The occurrence of drX for both the austenite and the 6-ferrite was estimated and plotted by related Zener-Hollomon equations. A drX kinetic model of the steel was established by flow stress and peak strain without considering dynamic recovery and 6-ferrite drX. The effects of deformation temperature and strain rate on drX volume fraction were discussed in detail. Increasing deformation temperature or strain rate contributes to drX of both the austenite and the 6-ferrite, whereas a lower strain rate leads to the austenite grains growth and the 6-ferrite evolution, from banded to island-like structure.
In order to avoid the accuracy deterioration or tool damage caused by milling chatter, it is necessary to have an efficient andreliable diagnosis system that can on-line predict/detect the occur-rence of chatter. The...
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In order to avoid the accuracy deterioration or tool damage caused by milling chatter, it is necessary to have an efficient andreliable diagnosis system that can on-line predict/detect the occur-rence of chatter. The diagnosis/predicting system proposed is to on-line process and analysis the vi-bration signals of the milling machine measured by accelerometers. According to the analysis results, the system will be able to detect/predict the occurrence of the chatter. The diagnosis algorithm is, first, collecting both the normal signals and chatter signals from milling processes, and then, converting the signals through wavelet transform and fast Fourier transform (FFT). Since the converted chatter sig-nals exhibit different characteristics from the normal signals, through defining the characteristic val-ues, such as root-mean-square value, max value, andratio of peak value to root-mean-square value, etc, a diagnosis reference library that contains the distribution of these characteristic values is built fordiagnosis. When a diagnosis is executing, the characteristic value of the measured signals is con-trasted with the diagnosis reference. The approach index which shows the possibility of occurrence of milling chatter will, then, be calculated through the diagnosis system. Cutting experiments are con-ducted to verify the proposeddiagnosis system. The results show the success of early chatterdetecting for the system.
Graphite, the most widely used anode material in lithium-ion batteries, faces significant limitations due to sluggish lithium-ion diffusion across the conventional organic solid electrolyte interphase (SEI) during cyc...
Graphite, the most widely used anode material in lithium-ion batteries, faces significant limitations due to sluggish lithium-ion diffusion across the conventional organic solid electrolyte interphase (SEI) during cycling. In this work, we propose the incorporation of SO 3 Li-grafted graphene as an ion-conducting agent (ICA) to enhance lithium-ion transport kinetics within graphite anodes. The –SO 3 Li functional groups regulate the Li + solvation structure through anion-solvent dipole interactions, promoting the formation of a lithium fluoride (LiF)-rich SEI that ensures uniform lithium-ion flux and significantly extends battery cycle life. This SO 3 Li-grafted ICA also mitigates mechanical strain within the graphite anode during repeated cycling, improving structural integrity over long-term operation, evidenced by fiber optic sensing technology. As a result, a 3 Ah Gr||LiFePO 4 pouch cell incorporating this functionalized ion-conducting agent achieves excellent cycling performance, retaining 86.4% of its capacity after 1200 cycles at 1 C. These findings demonstrate the effectiveness of functionalized ICAs in addressing the intrinsic limitations of graphite, providing a promising strategy fordeveloping long-life lithium-ion batteries for practical energy storage applications.
In the current era of information proliferation, social media platforms frequently present multimodal data that may propagate misinformation. To address this challenge, computer vision techniques have been increasingl...
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Concrete beams should be resistant against the influence of corrosive agents, environmental degradation, and mechanical forces. For this purpose, the arrangement of reinforcement, concrete mix design, and pole dimensi...
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Umami taste enhancers play a crucial role in improving the palatability and flavor profile of food products. This study investigated the umami-enhancing properties and structure-activity relationships of butyryl-amino...
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The high-temperature performance of iron ore fmes is an important factor in optimizing ore blending in sintering. However, the application of linearregression analysis and the linear combination method in most other ...
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The high-temperature performance of iron ore fmes is an important factor in optimizing ore blending in sintering. However, the application of linearregression analysis and the linear combination method in most other studies always leads to a large deviation from the desiredresults. In this study, the fuzzy membership functions of the assimilation ability temperature and the liquid fluidity were proposed based on the fuzzy mathematics theory to construct a model for predicting the high-temperature performance of mixed iron ore. Comparisons of the prediction model and experimental results were presented. The results illustrate that the prediction model is more accurate and effective than previously developed models. In addition, fuzzy constraints for the high-temperature performance of iron ore in this research make the results of ore blending more comparable. A solution for the quantitative calculation as well as the programming of fuzzy constraints is also introduced.
Poly(ether−ether ketone)(PEEK)is a linear aromatic macromolecule,which can form semi-crystalline aggregative status,allowing PEEK materials to have strong environment tolerance and excellent physicochemical *** materi...
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Poly(ether−ether ketone)(PEEK)is a linear aromatic macromolecule,which can form semi-crystalline aggregative status,allowing PEEK materials to have strong environment tolerance and excellent physicochemical *** materials have become a promising alternative to fabricate particular membranes used in extreme *** the past few decades,many researches and evolutions have emerged in membrane fabrication with PEEK materials and its applications for treating organic solvents and their mixtures;however,there are little systematic and comprehensive literature to summarize fabrication approaches,compile applications,and elaborate PEEK property-structure *** this review,the main approaches to fabricate PEEK-based membranes are illustrated concretely,including conventional thermal-induced and non-solvent-induced phase separation,and novel chemical-induced crystallization;the representative applications in ultrafiltration,nanofiltration and membrane contactor containing organic solvents are demonstrated ***,the mechanism to tune PEEK solubility in solvents,which can be achieved by altering monomers in synthesis processes or changing membrane preparation routes,is deeply ***,the existing problems and the future prospects are also *** review provides positive guidance fordesigning and fabricating membranes using PEEK and its derivative materials for task-specific applications in harsh conditions.
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