The investigation of electrocatalysis oxygen reduction reaction (ORR) on non-Pt electrodes is great interest to address the current technical bottleneck using costly and rare metal Pt in cathodes low-temperature fuel cells. present work presents a comparative study ORR carbon supported Pd B-doped (with ca. 7 at. % B doping) nanocatalysts with well-controlled particle sizes, dispersions, loadings (both 20 wt Pd). It found that Pd–B/C exhibits modestly higher electrocatalytic activity toward...

Aiming at solving the problems of low flexibility, poor internal extension, and chopstick effect in most laparoscopic surgical robots, this letter presents a flexible tendon-driven continuum manipulator with eight degrees freedom, called FIORA. The is composed three independent segments series, each segment includes 12 spherical joints made aluminum alloy backbone. driven by twelve tendons has good flexibility rigidity. compact actuation unit can meet requirements force position control for...

Crystal phase of titania support plays an important role in catalytic hydrogenation dimethyl oxalate. Optimized performance was achieved for the Cu/P25 due to intimate metal interaction.

Research on return to sport and psychological recovery in anterior cruciate ligament (ACL) revision remains scarce. The clinical efficacy of artificial ACL requires further exploration. Our objectives were (1) compare the midterm outcomes versus allogenic tendon graft (2) analyze effects employing revision. This cohort study included cases receiving from 2014 2021 Sports Medicine Department Huashan Hospital. grafts used Ligament Advanced Reinforcement System (LARS) ATT allograft. We recorded...

In order to explore the relationship between microstructure and macroscopic properties of PA510/SiO2 films, effect stretching on crystal structure orientation stretched films was studied. It could be seen from transmission electron microscopy (TEM) graphs that layered SiO2 molecules were mainly oriented toward machine direction (MD) dispersion improved by stretching. Through wide-angle X-ray scattering (WAXS) analysis, only contained a γ form. During uniaxial stretching, especially for 1 × 3...

A fractional Burgers model was proposed to investigate the creep behavior of Polyamide 6 (PA6) film. The tests at various conditions were conducted on dynamic mechanical analysis (DMA) tester, and strain-time ( ∊- t) curves deformation analyzed by derived model. results indicated that had a better performance than classical integer-order in simulating PA6 Parameters showed stress facilitated transformation from viscoelastic viscoplastic one under ambient condition. Whereas, state higher...

Abstract The crystal structure changes of PA510 films during uniaxially stretching at 80°C, 110°C, 140°C and 170°C had been investigated as a function ratio rate. stress–strain relationship curves showed that the stress gradually increased when increased. wide‐angle X‐ray diffraction results verified only one distinct equator reflection stretched was clearly identified 110°C 140°C, namely γ(100) 2θ = 20.6°. However, temperature reached 170°C, γ(004), γ(006) γ(008) form appeared in meridional...

Abstract At present, the mortality of cardiovascular and cerebrovascular diseases is getting higher higher, interventional surgery has obvious advantages over traditional surgery, robot technology also entered this field. Combined with existing research results, a set surgical system designed. The operating device uses magnetic powder brake to provide real force feedback braking torque, propulsion adopts clamping rod structure accurately clamp catheter or guide wire, signal collected by...

Ternary composites of polyamide 6 (PA6), mixed with unmaleated ethylene propylene diene terpolymer rubber (named as EPDM-M) and calcium carbonate (CaCO 3 , three different kinds surface morphology) were prepared via two-step melt blending process. The influence morphology CaCO on the impact toughness PA6/EPDM-M/CaCO was investigated. It found that Izod strength improved increasing area CaCO3. characterization by BET tester scanning electron microscope (SEM) obviously showed both...

Ternary composites of Polyamide 6 (PA6), the mixture Maleated and Unmaleated Ethylene Propylene Diene terpolymer rubber (named EPDM-M), nanoCalcium Carbonate (nanoCaCO 3 ) were prepared by one-step two-step compounding routes. The toughness was tested impact test. microstructure morphology surface etched investigated through scanning electron microscope (SEM). result shows that ternary with sandbag 270 % higher than neat PA6. SEM strongly elongated microfibrils deformation are formed in...

To study preliminarily on the relationship between properties of mixture composed Tongsaimai extract and different excipients pellet molding.The multivariate regression analysis was used to investigate correlation molding by measuring cohesion, liquid-plastic limit mixture, powder pellets. The weighted coefficients were determined analytic hierarchy process combined with criteria importance through intercriteria correlation.The results showed that seemed be a major factor, which had positive...

Objective To investigate the effect of surgical infection control during perioperative period after systemic highly effective antiretroviral therapy (HAART) in patients with acquired immunodeficiency syndrome (AIDS) complicated cataract. Methods The basic data 10 AIDS cataract before and operation collected from Beijing Ditan Hospital, Capital Medical University were analyzed, retrospectively. Results After for cases cataract, CD4+ T lymphocyte count increased to 196-745...