Multi-hop question answering over knowledge graph (KGQA) aims to find the answer entities that are multiple hops away from the entities in the question called seed entities in the knowledge graph. The main methods inc...
详细信息
Multi-hop question answering over knowledge graph (KGQA) aims to find the answer entities that are multiple hops away from the entities in the question called seed entities in the knowledge graph. The main methods include rule and template based methods and deep learning based methods. At present, deep learning based methods is in the mainstream, with the advantages of good portability and high utilization of knowledge graph information. A significant challenge is the lack of information on intermediate entities along the reasoning path. However, most deep learning models are unable to learn the correct reasoning path. To address this challenge, we propose a multi-path reasoning model, which selects the correct reasoning path by constraining the consistency of multiple paths from the seed entity to the answer entity. Then, a teacher-student network is adopted for model compression, where the teacher model relies on the proposed multi-path reasoning model. To demonstrate our model’s effectiveness on the KGQA task, we compared our model with four baselines on two benchmark datasets. The experimental results revealed that the Hits@1 values of the model reached 77.8% and 60.2% on WebQuestionsSP and Complex WebQuestions 1.1 datasets, respectively.
SiC-reinforced aluminum matrix(SiCp/Al)composite is widely utilized in the aerospace,automotive,and electronics industries due to the combination of ceramic hardness and metal ***,the significant disparity in properti...
详细信息
SiC-reinforced aluminum matrix(SiCp/Al)composite is widely utilized in the aerospace,automotive,and electronics industries due to the combination of ceramic hardness and metal ***,the significant disparity in properties between SiC particles and the aluminum matrix results in severe tool wear and diminished surface quality during conventional *** study proposes an environmentally friendly and clean dry electrical discharge assisted grinding process as an efficient and low-damage machining method for SiCp/*** experimental platform was set up to study the impact of grinding and discharge process parameters on surface *** study compared the chip formation mechanism and surface quality between dry electrical discharge assisted grinding and conventional grinding,revealing relationships between surface roughness,grinding force,grinding temperature,and related *** results indicate that the proposed grinding method leads to smaller chip sizes,lower grinding forces and temperatures,and an average reduction of 19.2%in surface roughness compared to conventional *** axial,tangential,and normal grinding forces were reduced by roughly 10.5%,37.8%,and 23.0%,*** optimized process parameters were determined to be N=2500 r/min,vf=30 mm/min,a=10μm,E=15 V,f=5000 Hz,dc=80%,resulting in a surface roughness of 0.161μm.
Torque sensors are essential components of robotic joints. In the past, structure optimization of force-sensing elements has been the common approach to improve the performance of the torque sensors. In this work, we ...
详细信息
Torque sensors are essential components of robotic joints. In the past, structure optimization of force-sensing elements has been the common approach to improve the performance of the torque sensors. In this work, we demonstrate a torque sensor with bulk metallic glasses as a force-sensing element. Compared with the sensors made of stainless steel and aluminum alloy, the use of bulk metallic glass as a force-sensing element significantly improves sensor sensitivity, linearity, repeatability, hysteresis, and measuring range. Our work not only opens up a new avenue for the application of bulk metallic glasses, but also provides opportunities for enhancing the performance of force/torque sensors through materials optimization.
Three-dimensional(3D)grid porous electrodes introduce vertically aligned pores as a convenient path for the transport of lithium-ions(Li-ions),thereby reducing the total transport distance of Li-ions and improving the...
详细信息
Three-dimensional(3D)grid porous electrodes introduce vertically aligned pores as a convenient path for the transport of lithium-ions(Li-ions),thereby reducing the total transport distance of Li-ions and improving the reaction *** there have been other studies focusing on 3D electrodes fabricated by 3D printing,there still exists a gap between electrode design and their electrochemical *** this study,we try to bridge this gap through a comprehensive investigation on the effects of various electrode parameters including the electrode porosity,active material particle diameter,electrode electronic conductivity,electrode thickness,line width,and pore size on the electrochemical *** numerical simulations and experimental investigations are conducted to systematically examine these effects.3D grid porous Li_(4)Ti_(5)O_(12)(LTO)thick electrodes are fabricated by low temperature direct writing technology and the electrodes with the thickness of 1085μm and areal mass loading of 39.44 mg·cm^(−2) are *** electrodes display impressive electrochemical performance with the areal capacity of 5.88 mAh·cm^(−2)@1.0 C,areal energy density of 28.95 J·cm^(−2)@1.0 C,and areal power density of 8.04 mW·cm^(−2)@1.0 *** study can provide design guidelines for obtaining 3D grid porous electrodes with superior electrochemical performance.
Rotational energy is a type of common energy source that can be harvested for supplying low-powered electronic *** paper proposes and investigates a novel cam-like dielectric elastomer generator(CDEG)for high-performa...
详细信息
Rotational energy is a type of common energy source that can be harvested for supplying low-powered electronic *** paper proposes and investigates a novel cam-like dielectric elastomer generator(CDEG)for high-performance rotational energy harvesting.A mushroom-head clamp is designed to form a type of advanced conical dielectric elastomer membranes(DEMs).Moreover,a type of multi-protrusion cam mechanism is designed in the CDEG to effectively convert any external rotational excitation into a linear reciprocating motion,which can be further converted into electricity through the ***,the operating principle of the system under external rotational excitation is analyzed theoretically by deducing the deformation condition of the DEMs and the electrical output of the ***,the prototype is fabricated,and the rotational-to-linear motion conversion rule of its cam-like mechanism and the DEM capacitance calculation approach are *** experimental results show that adequate charging time and discharging time of the DEMs,which can be realized through the proposed cam-like mechanisms,are beneficial to the energy harvesting(EH)performance of the ***,with the validated theoretical model,numerical simulations are conducted to further study the system dynamics and the influences of important system parameters on the EH performance to provide a guideline for system ***,the genetic algorithm is adopted to obtain the optimal system parameters and the corresponding electrical output of the proposed CDEG,demonstrating its superior output power at ultralow rotational frequencies compared with other typical rotational energy harvesters in the literature.
Metallic glasses(MGs)possess exceptional properties,but their properties consistently deteriorate over time,thereby resulting in increased complexity in *** thus poses a formidable challenge to the forming of long-ter...
详细信息
Metallic glasses(MGs)possess exceptional properties,but their properties consistently deteriorate over time,thereby resulting in increased complexity in *** thus poses a formidable challenge to the forming of long-term aged ***,we report ultrasonic vibration(UV)loading can lead to large plas-ticity and strong rejuvenation in significantly aged MGs within 1 s.A large UV-induced plasticity(UVIP)of 80%height reduction can be achieved in LaNiAl MG samples aged at 85%of its glass transition tem-perature(0.85 T_(g))for a duration of up to 1 *** energy threshold required for UVIP monotonously increases with aging *** the UV loading process,the aged samples show strong rejuvenation,with the relaxation enthalpy even surpassing that of as-cast *** findings suggest that UV loading is an effective technique for forming and rejuvenating aged MGs simultaneously,providing an alterna-tive avenue to explore the interplay between the property and microstructures as well as expanding the application prospects of MGs.
Multi-hop question answering over knowledge graph(KGQA) aims to find the answer entities that are multiple hops away from the entities in the question called seed entities in the knowledge graph. The main methods incl...
Multi-hop question answering over knowledge graph(KGQA) aims to find the answer entities that are multiple hops away from the entities in the question called seed entities in the knowledge graph. The main methods include rule and template based methods and deep learning based methods. At present, deep learning based methods is in the mainstream, with the advantages of good portability and high utilization of knowledge graph information. A significant challenge is the lack of information on intermediate entities along the reasoning path. However, most deep learning models are unable to learn the correct reasoning path. To address this challenge, we propose a multi-path reasoning model, which selects the correct reasoning path by constraining the consistency of multiple paths from the seed entity to the answer entity. Then, a teacher-student network is adopted for model compression, where the teacher model relies on the proposed multi-path reasoning model. To demonstrate our model's effectiveness on the KGQA task, we compared our model with four baselines on two benchmark datasets. The experimental results revealed that the Hits@1 values of the model reached 77.8% and 60.2% on Web Questions SP and Complex Web Questions 1.1 datasets,respectively.
Carbon films with two different kinds of sp^(2) nanocrystallited structure were investigated to study the stick–slip friction with the in-situ and ex-situ ***-situ transmission electron microscope(TEM)observation and...
详细信息
Carbon films with two different kinds of sp^(2) nanocrystallited structure were investigated to study the stick–slip friction with the in-situ and ex-situ ***-situ transmission electron microscope(TEM)observation and nanofriction tests revealed that the origins of stick and slip varied with shear stress and film *** the stick stage,shear stress gradually increased with the contact strengthened until reached the shear strength to break the interfacial adhesion;at the slip stage,the shear stress decreased and accompanied with film *** the sliding process,adhesive deformation resulted in the large stick–slip step while ploughing deformation led to a smoother ***-situ nanofriction tests on a series of sp^(2) nanocrystallited carbon films with different irradiation energies showed the expected sliding behavior with the in-situ *** study first clarified the mechanism of stick–slip friction with the in-situ TEM observation,which plays the important role for the micro and nano application of sp2 nanocrystallited carbon films.
With the rapid advancement of information technology, the modern battlefield is characterized by a highly complex electromagnetic environment. Radar radiation sources exhibit wide-ranging parameter variations and stro...
详细信息
Formation control of fixed-wing aerial vehicles is an important yet rarely addressed problem because of their complex dynamics and various motion constraints,such as nonholonomic and velocity *** guidance-route-based ...
详细信息
Formation control of fixed-wing aerial vehicles is an important yet rarely addressed problem because of their complex dynamics and various motion constraints,such as nonholonomic and velocity *** guidance-route-based strategy has been demonstrated to be applicable to fixed-wing ***,it requires a global coordinator and there exists control lag,due to its own *** this reason,this paper presents a fully distributed guidance-route-based formation approach to address the aforementioned ***,a hop-count scheme is introduced to achieve distributed implementation,in which each aircraft chooses a neighbor with the minimum hop-count as a reference to generate its guidance route using only local ***,the model predictive control algorithm is employed to eliminate the control lag and achieve precise formation shape *** addition,the stall protection and collision avoidance are also ***,three numerical simulations demonstrate that our proposed approach can implement precise formation shape control of fixed-wing aircraft in a fully distributed manner.
暂无评论