Open AccessCCS ChemistryRESEARCH ARTICLE14 Jul 2022Enormous Promotion of Photocatalytic Activity through the Use Near-Single Layer Covalent Organic Frameworks Xiaomin Ren†, Chunzhi Li†, Wanchao Kang†, He Li, Na Ta, Sheng Ye, Linyan Hu, Xiuli Wang, Can Li and Qihua Yang Ren† State Key Laboratory Catalysis, Dalian Institute Chemical Physics, Chinese Academy Sciences, 116023 University Beijing 100049 , Li† Kang† Applied Chemistry, College Chemistry Engineering, Lanzhou University, Lanzhou,...

Variation of bathymetry has a large effect on the sound propagation in deep water. An acoustic experiment is carried out South China Sea. Some different phenomena are observed for two tracks flat bottom and sloping environments. Numerical analysis based parabolic equation model RAM (range-dependent model) performed to explain causes differences. The experimental numerical results show that transmission losses (TLs) decrease down about 5 dB above slope due reflection bottom, with...

For a narrowband signal, an oscillating interference pattern is formed with target's moving when receiving at the bottom of sea. In this Letter, source observed using single vector sensor (SVS). A passive depth estimation method employing SVS proposed. This approach processes signals after adaptive line enhancing and extracts intensity, which oscillates periodically vertical azimuth. The achieved based on Fourier-transform relationship between period. simulation sea experiment verify method.

The received shock waves produced by explosive charges are often polluted bubble pulses in underwater acoustic experiments. A method based on warping operators is proposed to cancel the time-frequency domain. This applied data collected during Yellow Sea experiment November 2000. original signal first transformed into a warped operators. Then, analyzed Due different features between and domain for signal, can be easily filtered out. Furthermore, time retrieved inverse transformation....

Silicon carbide (SiC) ceramic is an ideal material for mechanical seal because of its super hardness, high strength, low friction coefficient, good thermal conductivity, and resistance to wear. However, due relatively resistivity SiC ceramic, the triboelectric charge caused by rubbing end-faces could not be released. It terrible that accumulation cause electrochemical corrosion, which would accelerate To decrease a desire improving performance seal. In this research, decreasing pressureless...

Strong dissolution generated a secondary porosity interval between 3 250–3 800 m in deep sandstones of the Shahejie Formation Gaoliu area. The porosities included intraparticle porosity, interparticle moldic and dissolved cement fractures. underground water area was fed with fresh northern Yanshan folded mountains. moved along big faults such as Baigezhuang, Xinanzhuang etc. under gravity force, then unconformities. horizon were formed by leaching ground these unconformities during shallow...

We report the structural and electrical transport properties of Fe 1– x Cu Se ( = 0, 0.02, 0.05, 0.10) single crystals grown by a chemical vapor method. Substituting for suppresses both nematicity superconductivity FeSe crystal, provokes metal–insulator transition. Our Hall measurements show that substitution also changes an electron dominance at low temperature un-doped to hole Cu-doped 0.02 0.1, reduces sign-change T R ) coefficient H ).

Abstract In the deep ocean, a vector sensor is deployed near seabed to receive direct waves from reliable acoustic path (RAP). space domain, can estimate vertical arrival azimuth of signal, which sensitive distance. frequency periodic interference pattern formed by and surface‐reflected wave decided both source depth azimuth. this work, multi‐step method for passive broadband localisation using single‐vector (SVS) proposed. At first, estimated in domain. Then ranging problem solved based on...

Abstract This paper addresses the Phanerozoic tectonic evolution of western Tarim Basin based on an integrated stratigraphic, structural and analysis. P-wave velocity data show that basin has a stable rigid basement. The experienced complex evolutionary history, this can be divided into six stages: Neoproterozoic to Early Ordovician, Middle Ordovician Devonian, Late Devonian Permian, Triassic, Jurassic Cretaceous Paleogene Quaternary. was rift in Ordovician. From consisted flexural...

The field of ocean ambient noise contains numerous information about the water column, especially sub-bottom. geoacoustics parameters sub-bottom are very important factors influencing spatial characteristics field. For different layered structures sub-bottom, bottom-loss shows critical angles according to sound speed each layer, while structure interference fringe is dependent on thickness sediment. Flux theory proposed by Harrison used in this paper. Using theory, curve can be extracted...

This paper represents the water column sound speed profiles (SSPs) by empirical orthogonal functions (EOFs) and inverts them matched field method using acoustic oceanographic data simultaneously collected in northern of South China Sea during a shallow experiment June 2009. The show evident spatial temporal variations caused internal waves. EOFs are extracted from long time temperature continuously measured sensor array. Using two-dimensional advective frozen-ocean model, simulation...

Ambient noise data measured in an experiment conducted near the sea route are analysed. It is found that at low frequency, horizontal correlation coefficients different separations oscillate much larger than predicted by classical ambient model. The theoretical analyses show observed phenomenon mainly caused windy together with discrete shipping nearby. An model proposed to include effects both sources and can be used forecast field a route.

During the Jurassic period, Gondwana Continent progressively rifted from north to south along three huge transform faults (Davie Fracture Zone (DFZ), Mozambique (MFZ) and Agulhas-Falkland (AFFZ)), forming northern, central southern continental margins Mozambique, producing a series of divergent strike-slip margins. These are crucial areas for understanding evolution as their crustal nature geometry have strongly impacted kinematic reconstruction Gondwana. Especially, debate about or oceanic...

Abstract The low frequency line spectrum noise radiated by ships has strong stability and is difficult to eliminate, which the key information required for passive signal detection. A vector coherent frequency‐domain batch adaptive enhancement method proposed address issue of insufficient detection capability traditional scalar (ALE) algorithms ship characteristic spectra in complex deep‐sea environments. This not only introduces idea processing, but also uses synchronously collected sound...

The ultramafic rock located on the northern slope of Lüliang Mountain in northwestern region North Qaidam Orogen is altered to serpentinite. occurrence disseminated chromite within serpentinite holds significant implications for understanding petrogenesis protolith. This work provides strong evidence a distinct zonal texture found rock, using petrographic microstructure and electron probe composition analysis. core characterized by high contents Cr#, with enrichment Fe3+# (Fe3+/(Cr + Al...