The moisture content in concrete pores is a critical parameter for most of the degradation processes suffered by concrete, such as shrinkage and related cracking. objective this paper to present formulation general distribution model young-age concrete. In modeling, both cement hydration diffusion resulted humidity variations are taken into account synchronously. effect initial water (after casting) on development considered introducing time parameter. simulation reduction produced from...

Soil organic carbon (SOC) is an essential property for soil function, fertility and sustainability of agricultural systems. It can be measured with visible near-infrared reflectance (VIS-NIR) spectroscopy efficiently based on empirical equations spectra data air/oven-dried samples. However, the spectral signal interfered by moisture content (MC) under in situ conditions, which will affect accuracy measurements calibration transfer among different areas. This study aimed to (1) quantify...

The moisture content in the concrete pores is a critical parameter for most of degradation processes suffered by concrete, example shrinkage and related cracking. In present paper, development internal relative humidity slab at an early age was investigated applying temperature combined digital sensor. experimental results show that reduced with age. general law inside can be described vapor-saturated stage 100% (Stage I) followed gradually II). length Stage I magnitude II are greatly...

Purpose Traditional chip‐level interconnection materials show many weaknesses given the development trend of microelectronic packaging technology. In order to meet needs high‐temperature for wide‐bandgap semiconductors, low‐temperature sintered nano‐silver as a novel semiconductor device‐metallized substrate material is being developed. One phenomenon that larger area would cause poor quality had been found in industry butut mechanisms were never previously studied. This paper aims address...

Despite the fact that economic data are of great significance in assessment human socioeconomic development, application this has been hindered partly due to unreliable and inefficient censuses conducted developing countries. The night-time light (NTL) imagery from Defense Meteorological Satellite Program’s Operational Linescan System (DMSP/OLS) provides one most important ways evaluate an economy with low cost high efficiency. However, little research addressed transferability estimation...

Polypropylene (PP) has raised environmental concerns particularly its depletion of fossil-fuels and contribution to climate change. To lower impacts, PP can be combined with biobased fillers such as calcium carbonate (CaCO3). The mechanical properties CaCO3 filled have not been explored in depth yet. Therefore this study examines the aesthetic, tensile, flexural, impact, (via life cycle assessment) injection moulded filler content ranging from 0% 40% at 5% increments. As percentage...

City components are important elements of a city, and their identification plays key role in digital city management. Various codes have been proposed by different departments systems over the years, however, application has partly hindered lack unified coding framework. The use code identifying component for management geospatial computation across is still problematic. In this paper, we put forward an improved based on discrete global grid system (DGGS). According to spatial location, were...

Plastic deformation can be applied to the processing or forming of semi-crystalline polymers. This work concerns drawing polypropylene (PP) sheets in order modify their thermo-mechanical properties. PP were rolled at 110°C induce molecular orientation. A stable process was carried out experimentally using a single-pass rolling technique. The influences ratio on structure, orientation, and properties investigated. original sheet opaque. had smooth surfaces showed high transparency ratios....

Structure and morphology of talcum-filled polyethylene (HDPE–talc) were studied to examine the nature beneficial effects commercial silane coupling agents. Effects additive on structures blends with various talc contents through differential scanning calorimetry (DSC) analyses. Mechanism reinforcement by flake-like filler analyzed both classical treatments a percolation model. Results suggest that for system, had changed properties filled plastics, mainly enhancement in dispersion...

Soil organic matter is an important component of soil, and its spatiotemporal dynamics great significance for precision agriculture as well global sustainable development. Visible near-infrared reflectance (VIS - NIR) spectroscopy provides efficient method to estimate the soil content (SOC) quickly effectively. In this study, quantitative relationships between VIS-NIR SOC were explored using Partial Least Square Regression (PLSR). The performances four data preprocessing methods including...

Aiming at the sealing failure of a water quality monitoring system in low-temperature environment, double rubber O-ring structure was designed, and its performance low temperatures studied. Finite element software ANSYS constructed structure, change process standard temperature installation studied by two-dimensional axisymmetric model. The results show that equivalent strain stress an increasing trend during process. With effect medium pressure, maximum contact seal ring increases from...

In order to minimize the gaps between direct laser deposition channels and improve quality performance of formed parts, process is utilized in additive manufacturing create sequential, single- double-channel layers on 304 stainless steel plates. Under premise keeping layer rate defocusing amount unchanged, this study investigates effects power, scanning speed, powder feeding morphology inclusions deposited layers. The aim determine optimal parameter values for single-layer, single-channel...

Soil water content (SWC) and soil organic carbon (SOC) are two important factors to consider when revegetation in degraded land of arid semiarid areas. Knowing the response SWC SOC vegetation restoration as well their coupling interaction is for sustainability restoration. In this study, three common plantations same recovery years were selected on China’s Loess Plateau, which included Pinus sylvestris, tabuliformis Populus simonii, evaluate interactions, then revealed influencing...

Background COVID-19 is a respiratory disease, and its symptoms may be affected by the upper airways of adolescents. Objective To investigate effect parameters adolescents’ on symptom severity. Methods This retrospective study was performed from January to March 2022 at Hospital Stomatology, Xi’an Jiaotong University, Xi’an, China. The inclusion criteria were patients who started orthodontic treatment for first time, experienced initial onset laboratory-confirmed COVID-19, received two...

Abstract The effect of processing on the structure and properties polyethersulfone (PES) has been studied. Processing at normal temperature (315° – 335°C) carried out by kneading for different times various roller rotating speeds, also successive extrusion cycles. Changes in PES appearance, melt viscosity, molecular weight, mechanical after were found. thermal stability during is from that measured analysis. A phenomenon thickening was found present authors. It seems this caused prolonged...

Owing to an efficient quenching process that ensure r-poly(vinyl chloride) be amorphous enough, crystallization of rPVC at lower temperatures has been found in samples with various processing histories. Through a modified Avrami analysis, kinetics the isothermal these low was studied, proving crystal growth studied temperature range controlled by segment mobility, which should follow WLF-type relationship. Such mechanism is unusual compared ordinary chain reptation. Also discussed were...

The entity's ID code is important for the identification information as well foundation of computer processing in spatial organization and management system. Based on GeoSOT (Geographical coordinates Subdividing grid with One dimension integral coding 2n-Tree) subdivision system, this paper puts forward a model global unique from three aspects coding, transcoding, physical storage. Experiments remote sensing image demonstrates model's advantages location topological calculation, which...