Vaterite crystals with a spherical shape were successfully obtained by the addition of aspartic acid (Asp) in calcium hydroxide (Ca(OH)2)–carbon dioxide reaction system. Crystalline products characterized X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, Raman thermogravimetric analysis, and differential calorimetry (TG-DSC). The experimental results indicate that Asp can inhibit growth calcite but promote formation vaterite, vaterite...

SUMMARY Launched on 2022 December 16, the Surface Water and Ocean Topography (SWOT) satellite, using synthetic aperture radar interferometric techniques, measures sea surface heights (SSHs) across two 50-km-wide swaths, offering high-resolution accurate 2-D SSH observations. This study explores efficiency of SWOT in seamount detection employing vertical gravity gradient (VGG) derived from simulated data. Simulated circular elliptical seamounts (height: 900–1500 m) are integrated within South...

Shale gas has become one of the primary energy resources during past few years, and its impact been profound in many countries. Hydraulic fracturing treatments are required for development shale reservoirs, consequent hydraulic fractures usually connect with original small-scale natural forming complex fracture networks these reservoirs. Therefore, a model numerical simulation, which is capable accurately modeling naturally hydraulically fractured essential optimization management such In...

Unmanned aerial vehicle (UAV)-enabled mobile edge computing (MEC) has recently emerged to provide data processing and caching in the infrastructure-less areas. However, limited battery capacity of UAV constrains its endurance time, makes energy efficiency one top priorities implementing UAV-enabled MEC architecture. In this backdrop, we aim minimize UAV’s consumption by jointly optimizing trajectory resource allocation, task decision bits scheduling users considering fairness. The...

Based on the analysis of current problems faced by application-oriented undergraduate teaching big data, this paper puts forward a “four-integration, three-level, one-center” talent training model production-education integration. After several years in-depth cooperation between university and enterprise integration production education, quality training, student employment rate teachers’ engineering practice ability data major in our school have been greatly improved, results well promoted...

Abstract This paper presents the spatiotemporal distributions of tropical tropopause layer (TTL) Kelvin wave (KW) amplitudes by using global navigation satellite sstem (GNSS) radio occultation (RO) data sets 2007–2020. The results show that longitudinal variations TTL KWs during different seasons are primarily driven zonal winds rather than static stability. Investigations on annual reveal below tropopause, reach maxima June, July, and August (JJA) minima December, January, February (DJF)...

About 10 yr of TOPEX/Poseidon (T/P) altimetry data have been used to compute time series lake levels at six inland lakes in China. To verify our T/P processing strategy, the T/P-derived Bosten Lake (west China) and Huron (north America) were compared with gauge records: good agreement is found between results. Wavelet spectra indicate annual interannual variations these levels, which are also sensitive climate variability. At timescale, Hulun China), Ngangzi (east Tibet) correlated...

Surface-enhanced Raman spectroscopy (SERS) has received renewed interest in recent years fields such as trace analysis, biorelated diagnosis, and living cell study. However, the interference of impurities left on surface from preparation process substrates or adsorbed ambient environment limits to some extent application SERS for analysis unknown samples. In present paper, we propose a method prepare clean by combined chemical adsorption iodide Au remove electrochemical oxidation obtain...

To seek new potential materials for hydrogen storage, an arc-discharge method was employed to prepare nanosized nickel(or cobalt)/graphite composites, in which the nickel (or cobalt) particles were highly dispersed a carbon matrix with particle size between 20 and 70 nm 5−20 nm). Quantitative TPD measurements showed that at about 500 °C 30−50 atm these composites could uptake up 2.8 wt % H2, can be released 1 atm. The addition of Ni Co) C found largely enhance H2 adsorption, optimal amount...

A new approach based on energy conservation principle for satellite gravimetry mission has been developed and yields more accurate estimation of in situ geopotential difference observables using K-band ranging (KBR) measurements from the Gravity Recovery Climate Experiment (GRACE) twin-satellite mission. This preserves gravity information sensed by KBR range-rate reduces orbit error as compared to previous balance methods. Results analysis 11 yr GRACE data indicated that resulting estimates...

Abstract The S4max data retrieved from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) radio occultation (RO) measurements during 2007 to 2015 is adopted investigate global distribution seasonal variation of sporadic E (Es) layers in present work. long-term short-term Es occurrence maps are presented spatial temporal distributions rates (ORs) further confirmed studied. International Geomagnetic Reference Field model (IGRF12) used calculate horizontal...

Abstract This paper presents our work on developing a platform for high performance reservoir simulations, which is developed to support the implementation of various simulators distributed-memory parallel systems. employs MPI (Message Passing Interface) communications and OpenMP shared-memory computation. It provides structured grids due its simplicity cell-centered data each grid cell. The has distributed matrix vector module map module. connects linear system modules. Commonly-used Krylov...

Abstract The Global Positioning System (GPS) radio occultation (RO) data provided by the Fengyun-3C (FY-3C) mission during January 2015 to December 2019 are used detect existence of sporadic E (Es) layers over globe, based on which spatial and temporal distributions Es occurrence rates (ORs) presented analyzed. results compared with morphology obtained using RO from Constellation Observing for Meteorology, Ionosphere, Climate (COSMIC) mission. It is found that seasonal variation patterns ORs...

Since the flight of Unmanned Aerial Vehicle (UAV) greatly consumes limited on-board energy and affects ability to afford computation services, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">it is urgent challenging minimize UAV’s endurance time while satisfying varieties constraints from UAVs users, such as budgets, cache capacities, resources, latency requirements.</i> In this paper, are endowed with capability temporarily buffer some...