Molecular simulations, which can explain macroscopic phenomena from a microscopic molecular perspective, are currently receiving considerable attention. The key to this is how characterize structural parameters and construct realistic numerical models of molecules. In paper, 13C NMR tests were performed on ten coal samples, the macromolecular carbon skeleton structure different samples was calculated analyzed, model constructed modified using Materials Studio (MS). According principles...

Nanoparticle (NP) catalysts are ubiquitous in energy systems, chemical production, and reducing the environmental impact of many industrial processes. Under reactive environments, availability catalytically active sites on NP surface is determined by its dynamic structure. However, atomic-scale insights into how a reconstructs under reaction conditions reconstruction catalytic activity still lacking. Using operando transmission electron microscopy, we show that Pd NPs exhibit periodic...

The internal structure of metals is defined by a complex network grain boundaries (GBs) and their intersections---triple junctions (TJs). Heat or stress forces GBs to migrate, thus altering many physical properties the material, TJs play key role in this migration as they control GB edges. GB-TJ interaction strongly depends on local crystallography, so it can only be properly described at atomic scale. Although recent direct atomic-scale imaging provides some insight into dynamic behavior,...

The development of prefabricated buildings is a long-term industrial policy in China. In the frame structure, slab one critical components. However, two kinds famous slabs China need template system and sometimes particular fabrication site. paper proposed novel concrete composite slab, which adopts high-strength bolt as shear connector. Compared with traditional precast does not temporary support. conventional it has analogous rigidity. Still, require fireproof coating. It fast construction...

In recent years, with the continuous development of new energy, how to efficiently use wind energy has received more and market attention. Due cost advantages, small turbines is accelerating. Among them, design research airfoil lift vertical axis turbine matured, but because aerodynamic characteristics structure, it impossible start itself at low speed, resulting in waste speed energy. Although drag good self-starting performance, utilization efficiency high-speed state inefficient. Each its...

Hollow bimetallic nanoparticles (NPs) formed from metal oxide NP templates are widely used catalysts for hydrogen evolution and CO2 reduction reactions. Despite their importance in catalysis, the details of how these NPs form on remain unclear. Here, using situ liquid-phase transmission electron microscopy (TEM) imaging, we describe conversion Cu2O template to hollow PdCu NPs. Our observations show that a polycrystalline shell forms surface via galvanic replacement reaction while undergoes...

Abstract Background The ultimate goal of medical care is to eradicate disease and restore normality a person’s life. Quality life (QOL) concern as dermatologists researchers strive find better drug treatments. However, there have been few reports on the factors associated with QOL among Chinese people psoriasis. Methods A total 185 psoriasis were surveyed assess their sociodemographic status, disease-related information, psychosocial QOL. questionnaires included questionnaire, Athens...

Process economy and dynamic controllability are critical for DMC/MeOH separation via the PSD process. In this paper, rigorous steady-state simulations of atmospheric-pressurized process with no, partial, full heat integration have been carried out Aspen Plus Dynamics. Further investigations conducted into economic design three neat systems. Simulation results indicated that: partial provided TAC savings 39.2 36.2%, respectively, compared to that no integration; non-heat-integrated system...

In this paper, a compliant control scheme based on the optimization of contact force robot leg is proposed to improve stability whole moving process robot. Firstly, according motion state robot, change its center gravity analyzed, then stable gait determined by margin, and smooth robot’s foot trajectory realized. Finally, model established. moving, between legs ground optimized in real-time, so that composite can walk steadily uneven terrain. The 3-D scorpion was built with ADAMS software,...

To enhance the lateral stability of a certain type high-speed train under bogie's active control, characteristics inertial actuators that generate control force in system are studied, delay whole Hardware-in-the-Loop (HIL) is measured, and multi-objective optimisation for feedback parameters with or without achieved this study. A linear model bogie dynamics, two actuators, acting on front rear end beams, established optimisation. Correspondingly, nonlinear vehicle Simpack platform both...

HR3C steel was widely used in superheaters and Reheaters of Million Power Unit because its good anti-oxidation corrosion performance high endurance strength. With the increase service time, showed obvious aging embrittlement, that is, early stage service, elongation at room temperature decreased to less than 10%, which posed a threat safe operation units. Although durable strength S30432 higher 600 ℃ ~700 ℃, lower Cr content steel, limited application steel. The research on analyzed. results...

Background: Melanoma is a highly malignant skin tumor with poor prognosis. Identification of novel biomarkers might potentially reveal the underlying mechanisms melanoma progression. Methods: We demonstrated relationship between pan-cancer CLEC2B expression and samples in The Cancer Genome Atlas (TCGA) database. Next, Kaplan-Meier plot Cox regression analysis determined prognostic value melanoma. Biological pathway enrichment was screened by Gene Ontology (GO), Kyoto Encyclopedia Genes...

In this paper, the static characteristics of pneumatic muscles are studied by means theoretical modelling, numerical simulation and experimental verification. Firstly, on basis ideal mathematical model, model muscle considering elasticity friction rubber is given. Based established a using SIMULINK toolbox in MATLAB software environment, which includes parameter assignment module, elastic force module so on. The influence frictional layer output during filling simulation. Finally, mechanical...

Aviation-grade aluminum alloy is one of the most important structural materials for aircraft body structure.It material basis developing national defense industry, constructing a modern economic system, and strengthening manufacturing sector China.Aluminum alloys with high strength/toughness, specific strength/modulus, Sc addition have been developed in recent decades.At present, research on next-generation design, processing methods, new development paradigm drawing attention.The...

A new and general way to prepare porous metals with highly ordered 3D arrays of void spaces is reported here. The technique involves filling the between colloidal crystals in a array metal ion solution, removing solvent produce salt skeleton. skeleton then undergoes chemical transformation metallic framework, such as that Ni (shown Figure), pore sizes few hundred nanometers.

According to the military requirements of naval equipment support command, functional characteristics Beidou navigation and positioning system MGIS are analyzed, a design method command automation based on is proposed. This organically combines computer technology, MGIS, satellite communication technology realize digitization command. The results show that an improved solution model used solve pseudorange formula, which least squares method. It has fast iteration speed high Kalman filtering accuracy.

Applying GMA (Giant Magnetostrictive Actuator) to ball screw pre-tightening is an innovation in mechanical engineering field. Compared with conventional electrostrictive actuator, has greater output force, energy and strain, it can achieve electric-magnetic-mechanical conversion. As a core component of GMA, GM rod rod) driven by the magnetic field excitation coil produce magnetostriction, thus force (or displacement) be used for pre-tightening. The designed should about 1100N displacement...