A new kind of high-performance asymmetric supercapacitor is designed with pyrolyzed bacterial cellulose (p-BC)-coated MnO2 as a positive electrode material and nitrogen-doped p-BC negative via an easy, efficient, large-scale, green fabrication approach. The optimal device possesses excellent supercapacitive behavior quite high energy power density. Nowadays, supercapacitors have drawn extensive attention because they can instantaneously transport higher within very short period than...

Recently, heteroatom‐doped three‐dimensional (3D) nanostructured carbon materials have attracted immense interest because of their great potential in various applications. Hence, it is highly desirable to exploit a simple, renewable, scalable, multifunctional, and general strategy engineer 3D nanomaterials. Herein, eco‐friendly, general, effective way fabricate nanofiber networks on large scale reported. Using this method, P‐doped, N,P‐co‐doped, B,P‐co‐doped are successfully fabricated by...

To meet the pressing demands for portable and flexible equipment in contemporary society, it is strongly required to develop next-generation inexpensive, flexible, lightweight, sustainable supercapacitor systems with large power densities, long cycle life, good operational safety. Here, we fabricate a all-solid-state device nitrogen-doped pyrolyzed bacterial cellulose (p-BC–N) as electrode material via low-cost, eco-friendly, low-temperature, scalable fabrication hydrothermal synthesis. The...

Although generally considered competitive, the alkenylation and carbonyl olefination routes to alkenes are also complementary. In this Account, we focus on these approaches for synthesis of regio- stereodefined di- trisubstituted a few examples tetrasubstituted alkenes. We discuss subset dienes oligoenes that conjugated. Pd-catalyzed cross-coupling using alkenyl metals containing Zn, Al, Zr, B (Negishi coupling Suzuki coupling) or halides related electrophiles provides method with widest...

Hard carbons attract myriad interest as anode materials for high-energy rechargeable batteries due to their low costs and high theoretical capacities; practically, they deliver unsatisfactory performance intrinsically disordered microarchitecture. Here we report a facile ion-catalyzed synthesis of phenol–formaldehyde resin-based hard-carbon aerogel that takes advantage the chelation effect phenol Fe3+, which consists three-dimensionally interconnected carbon network embedded with...

The zero-phonon transition rate of a nitrogen-vacancy center is enhanced by factor ∼70 coupling to photonic crystal resonator fabricated in monocrystalline diamond using standard semiconductor fabrication techniques. Photon correlation measurements on the spectrally filtered line show antibunching, signature that collected photoluminescence emitted primarily single center. linewidth coupled and spectral diffusion are characterized high-resolution excitation spectroscopy.

The mechanical properties of skin are important tissue parameters that useful for understanding patho-physiology, which can aid disease diagnosis and treatment. This paper presents an innovative method employs phase-sensitive spectral-domain optical coherence tomography (PhS-OCT) to characterize the biomechanical by measuring surface waves induced short impulses from a home-made shaker. Experiments carried out on single double-layer agar–agar phantoms, different concentrations thickness, in...

Optical interconnects have been recognized as the most promising solution to accelerate data transmission in artificial intelligence era. Benefiting from their cost-effectiveness, compact dimensions, and wavelength multiplexing capability, silicon microring resonator modulators emerge a compelling scalable means for optical modulation. However, inherent trade-off between bandwidth modulation efficiency hinders device performance. Here we demonstrate dense division modulator array on chip...

The dynamic shear modulus G and its degradation tendency G/Gmax are essential parameters for characterizing the properties of soil. Coastal facilities constructed on calcareous sand foundations subjected to multiple types cyclic loadings. To investigate effects uniformity coefficient Cu, effective confining pressure σ0′, relative density Dr, median grain size d50 rule sand, a set resonant column tests is conducted with different grain-size-distribution curves. experimental results clearly...

Photodetectors fabricated on microstructured silicon are reported. The photodetectors exhibited high photoresponse; at 3V bias, the responsivities were 92A∕W 850nm and 119A∕W 960nm. At wavelengths longer than 1.1μm, still showed strong photoresponse. A generation-recombination gain mechanism has been proposed to explain photoresponse of these photodiodes. From measurements noise current density, calculated was approximately 1200 bias.

We explored susceptibility to injury after global ischemia in SV-129 and C57Black/6 mice, two commonly used-background strains genetically engineered mice.Mice (n = 84) were subjected 15, 30, or 75 minutes of bilateral common carotid artery (BCCA) occlusion followed by reperfusion for 72 hours. BCCA was performed under halothane chloral hydrate anesthesia, one experiment, mean arterial blood pressure regional cerebral flow (laser Doppler flowmetry) matched controlled exsanguination. Baseline...

Silicon-germanium (Si–Ge)-based avalanche photodiodes (APDs) have shown a significant improvement in receiver sensitivity compared to their III–V counterparts due the superior impact ionization property of silicon. However, conventional Si–Ge APDs typically operate at high voltages and low speed, limiting application this technology data communication. In paper, we present waveguide photodiode using thin silicon multiplication region with breakdown voltage −10  V, speed 25 GHz,...

We report electrical tuning by the Stark effect of excited-state structure single nitrogen-vacancy (NV) centers located $\ensuremath{\lesssim}100\text{ }\text{ }\mathrm{nm}$ from diamond surface. The zero-phonon line (ZPL) emission frequency is controllably varied over a range 300 GHz. Using high-resolution spectroscopy, we observe strengths both cycling and spin-altering transitions. Under resonant excitation, apply dynamic feedback to stabilize ZPL frequency. transition locked several...

We describe theoretical and experimental investigations of motion artifacts that can arise in the detection shear wave propagating within tissue with phase-sensitive optical coherence tomography. find artifact is a combined product sample surface refractive index difference between air, which cannot be neglected when estimating tissue. A method compensating demonstrated, results emphasize need for compensation measuring mechanical response elastography or other biomedical applications.

We report on a noninvasive and noncontact all-optical method to measure the elasticity of cornea. use pulsed laser excite surface acoustic waves (SAW) that propagate corneal surface, then phase-sensitive optical coherence tomography system remotely record SAWs from which is estimated. In addition, able provide real-time tomographic images cornea being examined, an important consideration for clinical studies. While precisely maintaining range intraocular pressures (IOP), series measurements...

We report on a quantitative elastography technique achieved by combining phase-sensitive optical coherence tomography (PhS-OCT) with the surface acoustic wave (SAW) method. Different from traditional elastography, is impulse-stimulated SAW, rather than shear waves. PhS-OCT serves not only as detector to measure SAW signals but also means provide cross-sectional image of sample. The experimental results indicate that combination feasible heterogeneous tissue samples.

Direct methanol/ethanol alkaline fuel cells (DMAFCs/DEAFCs) represent an attractive mobile power generation technology. The oxidation reaction (MOR/EOR) often requires high-performance yet expensive Pt-based catalysts that may be easily poisoned. Herein, we report the development of PtCuNi tetrahedra electrocatalysts with optimized specific activity and mass for MOR EOR. Our synthetic structural characterizations show these have Cu-rich core PtNi-rich shell tunable surface composition....

We propose an integrated method combining low-frequency mechanics with optical imaging to map the shear modulus within biological tissue. Induced wave propagating in tissue is tracked space and time using phase-sensitive coherence tomography (PhS-OCT). Local estimates of shear-wave speed obtained from tracking results can image local modulus. A PhS-OCT system remotely records depth-resolved, dynamic mechanical waves at equivalent frame rate ∼47 kHz high spatial resolution. The proposed was...

A controllable and facile strategy is established for constructing metal-organic frameworks-based (MOF-based) hollow composites via a protein-induced soft-templating pathway. Using metal-sodium deoxycholate hydrogel as soft-template, nanotubes are gained while the protein absent. With presence of protein, nanospheres structure prepared by changing amount protein. To verify universality proposed pathway, two kinds proteins (

Cancer is one of the devastating diseases in world. The development nanocarrier provides a promising perspective for improving cancer therapeutic efficacy. However, issues with potential toxicity, quantity production, and excessive costs limit their further applications clinical practice.Herein, we proposed obtained from aloe stability leak-proofness. We isolated nanovesicles gel rind (gADNVs rADNVs) higher quality yield by controlling final centrifugation time within 20 min, modulating...