Artificial intelligence technologies such as computer vision (CV), machine learning, Internet of Things (IoT), and robotics have advanced rapidly in recent years. The new technologies provide ...non-contact measurements in three areas: indoor environmental monitoring, outdoor environ-mental monitoring, and equipment monitoring. This paper summarizes the specific applications of non-contact measurement based on infrared images and visible images in the areas of personnel skin temperature, position posture, the urban physical environment, building construction safety, and equipment operation status. At the same time, the challenges and opportunities associated with the application of CV technology are anticipated.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
A semicrystalline poly(trimethylene monothiocarbonate) (PTMMTC) has been synthesized via the selective and alternating copolymerization of carbonyl sulfide and oxetane. This reaction was catalyzed ...by (salen)CrCl accompanied by organic bases over a wide range of temperatures from 40 to 130 °C. PTMMTC is shown to exhibit similar crystallization behavior to high-density polyethylene (HDPE), i.e., being spherulite and possessing melting temperatures (T m) up to 127.5 °C and a degree of crystallinity (X c) of up to 71%. Moreover, PTMMTC has a wide processing temperature window of ca. 100 °C.
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IJS, KILJ, NUK, PNG, UL, UM
Pregnant women are generally more susceptible to viral infection. Although the impact of SARS-CoV-2 on pregnant women remains to be determined, evidence indicates that risks of adverse clinical ...outcomes are similar in pregnancy to the general population. Here we analyzed clinical symptoms and outcomes of 20 pregnant and 299 reproductive-aged non-pregnant female COVID-19 patients who were hospitalized during the same period. Laboratory measurements were compared among mild cases and healthy pregnant women. Our study found that pregnant patients showed enhanced innate immune response evident by higher neutrophils and C-reactive protein. Cytokines, chemokines, and growth factors (CCGFs) profiles from 11 pregnant and 4 non-pregnant COVID-19 patients and 10 healthy pregnant female patients, and lymphocyte subsets analysis of 7 pregnant patients and 19 non-pregnant patients, indicate suppressed cytokine storm and potential enhanced CD8+ T cell and NK cell activity in pregnant patients with COVID-19, which may be essential in contributing to the unique anti-SARS-CoV-2 response in pregnancy.
A solution‐processed fullerene‐based organic Schottky junction photovoltaic device is fabricated to produce a large open circuit voltage, 0.85–0.95 V, which is higher than that of most organic ...bulk‐heterojunction devices. A power conversion efficiency of 5% is achieved in fullerene‐derivative 6,6‐phenyl‐C71‐butyric acid methylester‐based Schottky junction devices.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
Terahertz spectroscopy is only now beginning to make its transition from initial development by physicists and engineers to broader use by chemists, materials scientists and biologists, thanks to the ...increasing availability of commercial terahertz spectrometers. With the unique insights that terahertz spectroscopy can provide into intermolecular bonding and crystalline matter, it could prove to be an invaluable addition to the chemist's analytical toolset. This
tutorial review
aims to give an introduction to terahertz spectroscopy, its techniques, equipment, current applications and potential for the chemical sciences to a broad readership.
This tutorial review aims to give an introduction to terahertz spectroscopy, its techniques, equipment, current applications and potential for the chemical sciences.
In aerospace applications, composite grids have been widely utilized to enhance the strength of large thin-shell components. Recently, a growing focus has been on the research of 3D printing ...continuous fiber-reinforced thermoplastic composites. The 3D printing method offers various advantages over traditional molding processes, including a simpler process, higher material utilization, and lower manufacturing costs. However, the use of 3D printing for manufacturing continuous fiber-reinforced composite structures presents challenges, such as a high occurrence of defects within the structure and insufficient mechanical properties. These limitations hinder its widespread application. To address these issues, this study proposes a method for treating 3D-printed composite grid structures using induction heating. Initially, the induction heating mechanism of 3D-printed composite grids was analyzed by studying the impedance at the junction, including direct contact resistance and dielectric hysteresis loss. Subsequently, the impact of induction heating treatment on internal defects was explored by observing micro morphologies. The results show that the combination of induction heating and vacuum pressure effectively reduces porosities within the 3D-printed carbon fiber composite grids. Additionally, 3D-printed composite grid-stiffened PLA structures were fabricated with induction heating, and the bending and impact tests were conducted to evaluate their mechanical properties. The results indicate that using a grid-unit size of 4 mm leads to significant increases in bending strength and modulus of the grid-stiffened structure, with improvements of 137.6% and 217.8%, respectively, compared to the neat PLA panel. This demonstrates the exceptional mechanical enhancement efficiency of the 3D-printed lightweight composite grids.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
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•Nitrohumic acid driven physicochemical changes for eco-friendly of bauxite residue.•A higher soil maturation degree was found in the nitrohumic acid treated residues.•Nitrohumic acid ...reinforces the trend change in IEP and PZC towards pedogenic.•Stable aggregates content increased in nitrohumic acid neutralized bauxite residue.
Bauxite residue exhibiting high sodicity, nutrient deficiency, and poor structure, has a very slow effect on natural vegetation. However, it presents some eco-friendly indicators through substrate improvement, which is the basis for bauxite residue to show pedogenesis and vegetation restoration. To test the effectiveness of acid organic materials toward promoting transformation into a soil-like material, bauxite residue was amended with nitrohumic acid to improve the physical and chemical properties. The pH, total alkalinity, and exchangeable sodium percentage of the treated bauxite residues decreased from 10.2, 2.7 cmol/kg, and 20.6% to 8.0, 0.4 cmol/kg, and 5.1%, respectively, whilst organic matter, available N and P increased from 1.3%, 6.7 mg/kg, and 0.8 mg/kg to 7.2%, 69.7 mg/kg, and 2.4 mg/kg, respectively. The results obtained from excitation-emission matrix spectroscopy also indicate that the nitrohumic acid treated residues have a higher fulvic acid content and present a significant amount of humified material and soil maturation. The high alkalinity of bauxite residue promotes the release of hydroxyl and phenolic hydroxyl groups from fulvic acid to combine with cations. Nitrohumic acid neutralization lowered the IEP and PZC to pH 7.83 and 7.79, and made its surface charge properties closer to the soil; the decreased zeta potential of residues resulted in the particles dispersed state tend to aggregate. And as a result, the number of 0.05–0.25 mm and > 0.25 mm aggregates in the treated bauxite residues significantly increased, the sheet-like fine particles adhere to the surface of the large particles resulted in an accumulation and a layer structure formed. Amount of Ca and Fe in the aggregates as an inorganic binder combined with organic to promote the formation of micro-aggregates; whereas the content of Na and Si, which act as a “dispersant” and “filler” decreased.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
•Active bacteria are used as the only precursor to prepare a P–Fe/NC electrocatalyst.•Superior CO selectivity with excellent Zn–CO2 battery performance is achieved.•Enhanced kinetics due to the ...presence of P is clarified.
The construction of efficient electrocatalysts is key in harnessing the electrochemical CO2 reduction reaction (CRR) to produce high-value chemicals. Herein, a typical bacterium containing metal–nitrogen (M−N) groups and with a rich phosphorus content, Shewanella oneidensis MR-1, was used as a single precursor to produce atomically dispersed iron–nitrogen–phosphorus active sites (P–Fe/NC-1000) for converting CO2 to CO. Excellent CO selectivity of nearly 100% at 390 mV overpotential was achieved with good stability, and a rechargeable Zn–CO2 battery provides a maximum power density of 1.32 mW cm−2. Kinetic isotope effect measurements revealed that the presence of P atoms accelerates water dissociation and transfers a proton to Fe centers to promote protonation of intermediates and the overall CRR process. This synthesis strategy based on the intrinsic structure of a precursor may inspire the development of other high-performance catalysts for diverse electrochemical reactions beyond the CRR .
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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