Cost-effective catalysts for electrocatalytic water splitting play a key role in the renewable energy research. Although Pt has been regarded as best catalyst, its wide applications have impeded by high cost and scarce natural abundance. Therefore, decreasing usage electrocatalyst design is significant toward hydrogen evolution reaction (HER). Herein, flower-like nanocrystals were loaded on surface of nitrogen-doped graphene using Si nanowires sacrificial template. The experimental results...

A photoredox catalytic method was developed for the direct cyanation of alkyltrifluoroborates. This reaction provides a new and useful transformation easily available The photocatalytic can tolerate variety functional groups with mild conditions. Mechanistic investigations are consistent present following radical pathway.

Little is known about the role of timing physical activity in female reproductive disorders. These disorders include polycystic ovary syndrome (PCOS), heavy menstrual bleeding (HMB), endometriosis, infertility, and pregnancy-related This study aims to investigate associations patterns with diseases. A total 49,540 participants from UK Biobank valid accelerometer data were enrolled at baseline. Activity defined based on moderate-to-vigorous intensity (MVPA) throughout day. Participants...

Developing a bifunctional electrocatalyst with facile method, low cost, excellent performance and good stability for overall water splitting is essential the wide application of hydrogen production.

The authors present a power-efficient large-scale lensless optical traps on chip (OTOCs) as an optofluidic element for sorting of microparticles. Based the well-known Talbot self-imaging effect in Fresnel region, OTOC makes use two-dimensional microfabricated chessboardlike structure to create lattice near its emergent plane. Simultaneous trapping hundreds microparticles regular array (>200×200μm2) is proved experimentally without adopting external projection lens configuration....

Rh–Ag–Si ternary catalysts exhibit more active hydrogen evolution performance than Pt–Ag–Si based on the theoretical calculation and experimental results.

Real-time detection of driver fatigue status is great significance for road traffic safety. In this paper, a proposed novel method able to detect the driver’s around clock. The face images were captured by camera with colored lens and an infrared mounted above dashboard. landmarks labeled eye-area wassegmented. By calculating aspect ratios eyes, duration eye closure, frequency blinks PERCLOS both infrared, can be detected. Based on change light intensity detected photosensitive device,...

The authors propose a three-dimensional (3D) optical trapping of microparticles in multiple planes simultaneously based on modified self-imaging effect. Similar to the Talbot effect, effect is induced by layer trapped particles and it subsequently used as periodic grating structure generate its own pattern 3D. Based this secondary layer-by-layer silica polystyrene colloidal at different microchamber are demonstrated experimentally.

An on-chip optical trapping and sorting system composed of a microchamber microlens array (MLA) is demonstrated. The MLA focuses the incident light into multiple confocal spots to trap particles within microchamber. SiO(2)/ZrO(2) solgel material introduced in fabrication for its unique chemical characters. Moreover, order prove effectiveness system, experimental demonstration multibeam locked-in transport micropolymer implemented. may easily be integrated as microfluidic devices, offering...

Globalization makes innovation talent more important. The country's economy, technology and culture need to be driven by innovation, which the U.S. government promote STEM education a strategic. In new era background, should adapted this development form "STEM+" education. 3D printing innovative integration analysis, on one hand, can provide platform for implementation of education, other accelerate formation model. Additionally, specific curriculum scheme is given, provides reference teaching.

We propose a simple, reliable and cost-effective method for microfluidic sorting of microparticles using an optical potential landscape projected by composite microlens array (MLA). The MLA enables high power efficient approach to forming shape size the pattern. Sorting particles is demonstrated both theoretically experimentally.

One difficulty of teaching in mathematics is to present abstract mathematical concepts or laws students a simple visual way promote students' understanding and mastery. Traditionally teachers tried explain formulas by means some tools models presented software, such as Matlab, Mathematica, etc. As an integrated modern discipline, 3D printing has become more important scientific research technological developments. This paper intends explore the close relationship between technology, propose...

Modulating the morphology of Pt is an effective approach to augment active sites and mass activities for hydrogen evolution reaction (HER). Here a facile one-step method employed fabricate modified graphene nanocomposites (Pt-G) with help silicon monoxides (SiO) hydrofluoric acid. SiO introduced as reducing agent ions oxides through Si–H bonds promotes catalytic performance Pt-G. The obtained on shows nanosponge structure due secondary nucleation in situ growth SiO. When Pt-G are...

Particles optically trapped and rotated in fluidic medium by a vortex beam receive torque exerted orbital angular momentum of the beam. Size shape particles are found to affect rotation remarkably; e.g., lump is easier be set than single particle, row stuck each other will rotate faster isolated particles. Influences size arranging manner group on investigated analytically experimentally.

A composite microlens array (MLA) with two cascaded guiding axes has been fabricated to achieve a large lateral separation of an object different refractive indices or sizes. The MLA projects pattern formed by its focal spots into microchamber for optical sorting in microscopic system. This approach enables passive, high power, efficient, and continuous microfluidic without requiring complicated assembly. Separation particles angle 40° is experimentally demonstrated moderate laser power.

We demonstrate that it is possible to generate high-order optical vortices from a single phase wedge by applying an incident beam with annular intensity distribution. Various topological charges of are realized static when the position and radius illumination changed accordingly.

Carrier-free ultra-wideband impulse radars are increasingly used in target detection due to their high resolution and strong interference capabilities. This letter designs a deep residual shrinkage network achieve the multiangle intelligent vehicle recognition. First, geometric models of armored car, truck, tank established. Echo signals under excitation carrier-free (UWB) signal obtained. Second, echo from different azimuth pitch angles arranged combined into 2-D matrix so that information...