244,044 results match your criteria high temperatures


A multi-motion bionic soft hexapod robot driven by self-sensing controlled twisted artificial muscles.

Bioinspir Biomim 2021 May 13. Epub 2021 May 13.

State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin Institute of Technology, Harbin, 150001, Heilongjiang Province, Harbin, 150001, CHINA.

Artificial muscles have unique advantages for driving bionic robots because their driving mode is similar to biological muscles. However, there is still a big gap between the existing artificial muscle and biological muscle in performance. The twisted artificial muscles (TAMs) from nylon 6,6 provides a low-cost, high integration, low hysteresis driving method. Read More

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Self-Standing combined covalent-organic-framework membranes for subzero conductivity assisted by ionic liquids.

J Colloid Interface Sci 2021 Apr 30;599:595-602. Epub 2021 Apr 30.

College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, PR China. Electronic address:

The development of proton-conducting materials in cold regions is still at the initial stage due to the challenge in breaking the subzero temperature limit, especially in covalent organic frameworks (COFs). Herein, we fabricated a series of proton-conductive COFs as self-standing, highly flexible combined membranes (ssc-COFMs) composed of a processable TpBD-Me and a conductive Tp-TG, in-situ encapsulated proton-conducting ionic liquids (PCILs) as additional proton sources into backbones. Compositions and microstructures of ssc-COFMs are monitored by XRD, FTIR, nitrogen adsorption and elemental analysis. Read More

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Effects of different frying temperatures on the aroma profiles of fried mountain pepper (Litsea cubeba (Lour.) Pers.) oils and characterization of their key odorants.

Food Chem 2021 Apr 20;357:129786. Epub 2021 Apr 20.

College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710100, China.

Fried mountain pepper (Litsea cubeba (Lour.) Pers.) oil is widely used as a traditional spice flavoring oil in Chinese home cooking. Read More

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Photoluminescence and optical temperature measurement of Mn/Er co-activated double perovskite phosphor through site-advantageous occupation.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Apr 9;259:119797. Epub 2021 Apr 9.

Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China.

Because traditional methods based on thermal coupling energy level temperature measurement have large errors, a new temperature sensing strategy is proposed to attain strong sensitivity and excellent signal resolution ability. The rare-earth and also transition metal ions with poles apart thermal quenching channels are used as dual emission centers to find a suitable host to achieve high-efficiency dual-mode emission. In this work, a string of phosphors with NaLaMgWO (NLMW) as the host, the single-doped and double-doped Mn and Er phosphors were adopted by the traditional high temperature solid-state reaction method. Read More

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Delivery of curcumin using a zein-xanthan gum nanocomplex: Fabrication, characterization, and in vitro release properties.

Colloids Surf B Biointerfaces 2021 May 10;204:111827. Epub 2021 May 10.

School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan, 316022, PR China. Electronic address:

This study aimed to use xanthan gum as a stabilizer to improve the stability of zein nanoparticles. Zein-xanthan gum composite nanoparticles were prepared via anti-solvent precipitation at pH 4.0. Read More

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Ultra long-lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes.

Angew Chem Int Ed Engl 2021 May 13. Epub 2021 May 13.

Complutense University of Madrid: Universidad Complutense de Madrid, Organic Chemistry, Avenida Complutense, Facultad de Ciencias Químicas, 28040, Madrid, SPAIN.

Suitably engineered molecular systems exhibiting triplet excited states with very long lifetimes are important for high-end applications in nonlinear optics, photocatalysis or biomedicine. We report the finding of an ultra long-lived triplet with a mean lifetime of 93 ms in aqueous phase at room temperature, measured for a globular tridecafullerene with a highly compact glycodendrimeric structure. A series of three tridecafullerenes bearing different glycodendrons and spacers to the C 60 units have been synthesized and characterized. Read More

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Super Stretchable and Durable Electroluminescent Devices Based on Double-Network Ionogels.

Adv Mater 2021 May 13:e2008849. Epub 2021 May 13.

Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center, Pusan National University, Busan, 46241, Republic of Korea.

Ionogels are good candidates for flexible electronics owing to their excellent mechanical and electrical properties, including stretchability, high conductivity, and stability. In this study, conducting ionogels comprising a double network (DN) of poly(N-isopropylacrylamide-co-N,N'-diethylacrylamide)/chitosan which are further reinforced by the ionic and covalent crosslinking of the chitosan network by tripolyphosphate and glutaraldehyde, respectively, are prepared. Based on their excellent mechanical properties and high conductivity, the developed DN ionogels are envisioned as stretchable ionic conductors for extremely stretchable alternating-current electroluminescent (ACEL) devices. Read More

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Survey of New Zealand poultry consumers handling of raw poultry and food safety awareness to provide insight into risk factors for campylobacteriosis.

J Food Prot 2021 May 13. Epub 2021 May 13.

Lincoln University.

New Zealand (NZ) has a high rate of reported campylobacteriosis cases. Cross-contamination in home kitchens during poultry handling is considered to be the main factor in campylobacteriosis transmission. The main aim of this study was to measure NZ consumers' food safety awareness and self-reported food safety practices associated with handling raw poultry. Read More

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A fast MR-thermometry method for quantitative assessment of temperature increase near an implanted wire.

PLoS One 2021 13;16(5):e0250636. Epub 2021 May 13.

IHU Liryc, Electrophysiology and Heart Modeling Institute, Fondation Bordeaux Université, Pessac-Bordeaux, France.

Purpose: To propose a MR-thermometry method and associated data processing technique to predict the maximal RF-induced temperature increase near an implanted wire for any other MRI sequence.

Methods: A dynamic single shot echo planar imaging sequence was implemented that interleaves acquisition of several slices every second and an energy deposition module with adjustable parameters. Temperature images were processed in real time and compared to invasive fiber-optic measurements to assess accuracy of the method. Read More

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Whole genome sequencing of a snailfish from the Yap Trench (~7,000 m) clarifies the molecular mechanisms underlying adaptation to the deep sea.

PLoS Genet 2021 May 13;17(5):e1009530. Epub 2021 May 13.

Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China.

Hadal environments (depths below 6,000 m) are characterized by extremely high hydrostatic pressures, low temperatures, a scarce food supply, and little light. The evolutionary adaptations that allow vertebrates to survive in this extreme environment are poorly understood. Here, we constructed a high-quality reference genome for Yap hadal snailfish (YHS), which was captured at a depth of ~7,000 m in the Yap Trench. Read More

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Phytohemagglutinin ameliorates HFD-induced obesity by increasing energy expenditure.

J Mol Endocrinol 2021 May 1. Epub 2021 May 1.

X Liu, Institute of Neuroscience and Translational Medicine, Zhoukou Normal University, Zhoukou, China.

Despite all modern advances in medicine, there are few reports of effective and safe drugs to treat obesity. Our objective was to screen anti-obesity natural compounds, and to verify whether they can reduce the body weight gain and investigate their molecular mechanisms. By using drug-screening methods, Phytohemagglutinin (PHA) was found to be the most anti-obesity candidate natural compound. Read More

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Cleavage-Resistant Protein Labeling With Hydrophilic Trityl Enables Distance Measurements .

J Phys Chem B 2021 May 13. Epub 2021 May 13.

Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.

Sensitive distance measurements in proteins using pulsed-electron spin resonance (ESR) require reduction-resistant and cleavage-resistant spin labels. Among the reduction-resistant moieties, the hydrophilic trityl core known as OX063 is promising due to its long phase-memory relaxation time (). This property leads to a sufficiently intense ESR signal for reliable distance measurements. Read More

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In Situ Recombination of Elements in Spent Lithium-Ion Batteries to Recover High-Value γ-LiAlO and LiAlO.

Environ Sci Technol 2021 May 13. Epub 2021 May 13.

School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China.

Recovering valuable materials from spent lithium-ion batteries is an important task because of the asymmetry in resource distribution, supply, and demand around the world. A lithium-ion battery is a combination system of various elements and their oxides. Current recovering technologies focus on the separation of valuable metal elements. Read More

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High Working Capacity Acetylene Storage at Ambient Temperature Enabled by a Switching Adsorbent Layered Material.

ACS Appl Mater Interfaces 2021 May 13. Epub 2021 May 13.

Bernal Institute, Department of Chemical Sciences, University of Limerick, Limerick V94 T9PX, Ireland.

Unlike most gases, acetylene storage is a challenge because of its inherent pressure sensitivity. Herein, a square lattice () coordination network [Cu(4,4'-bipyridine)(BF)] () is investigated with respect to its CH sorption behavior from 189 to 298 K. The CH sorption studies revealed that exhibits multistep isotherms that are temperature-dependent and consistent with the transformation from "closed" (nonporous) to four "open" (porous) phases induced by the CH uptake. Read More

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In Situ TEM Studies of Sodium Polysulfides Electrochemistry in High Temperature Na-S Nanobatteries.

Small 2021 May 13:e2100846. Epub 2021 May 13.

Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P. R. China.

Understanding polysulfide electrochemistry in high temperature sodium-sulfur (HT-Na-S) batteries is crucial for their practical applications. Currently the discharge capacity of commercial HT-Na-S battery achieves only one third of its theoretical capacity due to polysulfides formation, understanding of which is limited due to technical difficulty in direct imaging polysulfides. Herein, in situ transmission electron microscopy implemented with a microelectromechanical systems (MEMS) heating device is used to investigate the electrochemical reactions of HT-Na-S batteries. Read More

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The Effect of Process Variables and Binder Concentration on Tabletability of Metformin Hydrochloride and Acetaminophen Granules Produced by Twin Screw Melt Granulation with Different Polymeric Binders.

AAPS PharmSciTech 2021 May 13;22(4):154. Epub 2021 May 13.

Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA.

In twin screw melt granulation, granules are produced by passing mixtures of drug substances and polymeric binders through twin screw extruder such that temperatures are maintained below melting point of drugs but above glass transition of polymers used, whereby the polymers coat surfaces of drug particles and cause their agglomeration into granules. Since various formulation factors, such as binder type and concentration, and processing variables like extrusion temperature, screw configuration, and screw speed, can influence the granulation process, the present investigation was undertaken to study their effects on tabletability of granules produced. Three different types of polymeric binders, Klucel® EXF (hydroxypropyl cellulose), Eudragit® EPO (polyacrylate binder), and Soluplus® (polyvinyl caprolactam-co-vinyl acetate-ethylene glycol graft polymer), were used at 2, 5, and 10% concentrations. Read More

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Succinic anhydride-based chemical modification making laccase@Cu(PO) hybrid nanoflowers robust in removing bisphenol A in wastewater.

Bioprocess Biosyst Eng 2021 May 13. Epub 2021 May 13.

College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, People's Republic of China.

To prepare a robust biocatalyst and enhance the removal of bisphenol A in wastewater, succinic anhydride was reacted with laccase to obtain succinic anhydride-modified laccase (SA-laccase) and then co-crystallized with Cu(PO) to form SA-laccase@Cu(PO) hybrid nanoflowers (hNFs). The activity of SA-laccase@Cu(PO) reached 5.27 U/mg, 1. Read More

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Apparent autocatalysis due to liquefaction: thermal decomposition of ammonium 3,4,5-trinitropyrazolate.

Phys Chem Chem Phys 2021 May 13. Epub 2021 May 13.

N.N. Semenov Federal Research Center for Chemical Physic, Russian Academy of Sciences, 4 Kosygina Str., Moscow 119991, Russia.

Thermal decomposition of solids is often accompanied by autocatalysis, one of the possible causes of which is the formation of a liquid phase. The kinetic model considering the liquefaction of solid reactants under isothermal conditions was proposed by Bawn in the 1950s. The present study reports the application of the Bawn model to the thermolysis of 3,4,5-trinitropyrazole ammonium salt (ATNP) under nonisothermal conditions. Read More

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Tetrairon(II) extended metal atom chains as single-molecule magnets.

Dalton Trans 2021 May 13. Epub 2021 May 13.

Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM, I-41125 Modena, Italy.

Iron-based extended metal atom chains (EMACs) are potentially high-spin molecules with axial magnetic anisotropy and thus candidate single-molecule magnets (SMMs). We herein compare the tetrairon(ii), halide-capped complexes [Fe4(tpda)3Cl2] (1Cl) and [Fe4(tpda)3Br2] (1Br), obtained by reacting iron(ii) dihalides with [Fe2(Mes)4] and N2,N6-di(pyridin-2-yl)pyridine-2,6-diamine (H2tpda) in toluene, under strictly anhydrous and anaerobic conditions (HMes = mesitylene). Detailed structural, electrochemical and Mössbauer data are presented along with direct-current (DC) and alternating-current (AC) magnetic characterizations. Read More

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All-fiber high-voltage capacitor unbalanced current transformer.

Appl Opt 2021 May;60(13):4034-4038

According to the high-voltage and small-current characteristics for unbalanced current of high-voltage capacitors, a novel fiber optical filter unbalanced current transformer (FU-FOCT) is proposed, where an all-fiber temperature sensor based on the temperature birefringence effect of polarization-maintaining fiber is designed and integrated into an FU-FOCT for real-time temperature correction. The FU-FOCT prototype with a rated current of 1 A and a rated voltage of 258 kV is developed, and the accuracy, temperature, and frequency-response characteristics are tested. The results show that within the temperature range of ${-}{40}^\circ {\rm C} - 70^\circ {\rm C}$, the fluctuation range of the ratio error and phase error of the FU-FOCT at 1 A are ${-}{0. Read More

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Temperature sensing utilizing unclad plastic optical fiber with a balloon-like bent structure.

Appl Opt 2021 May;60(13):3895-3900

A plastic optical fiber (POF) temperature sensor with high sensitivity is experimentally demonstrated in this work. The temperature sensor is realized by a combination of macrobending and an unclad region in the fabrication of its sensor head. The POF sensor is bent into a balloon-like structure in order to introduce the effect of macrobending. Read More

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Simultaneous measurement of temperature and relative humidity based on a twisted microfiber coated with nanomaterials.

Appl Opt 2021 May;60(13):3849-3855

We propose a twisted microfiber interferometer sensor coated with boron nitride (BN) nanosheets for simultaneous measurement of relative humidity (RH) and temperature ($ T $). Sensitive material characteristics (BN nanosheets) enhance refractive index (RI) sensing sensitivity of proposed devices. A twisting process on the microfiber surely improves the evanescent field interaction with the deposited layer. Read More

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Numerical analysis of the DKDP-based high-energy optical parametric chirped pulse amplifier for a 100  PW class laser.

Appl Opt 2021 May;60(13):3842-3848

An optical parametric chirped pulse amplifier (OPCPA) based on a large-aperture DKDP crystal and pumped by a 10 kJ level Nd:glass laser can serve as the final amplifier for a 100 PW level laser. A comprehensive numerical investigation on such a high-energy OPCPA is presented in this work. The effects on the efficiency-bandwidth product induced by the deuteration level, absorption loss, temperature variation, and optimization of zero-phase-mismatch wavelength (ZPMW) are analyzed in detail. Read More

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321  W high-efficiency continuous-wave green laser produced by single-pass frequency doubling of narrow-linewidth fiber laser.

Appl Opt 2021 May;60(13):3836-3841

In this study, a high-power continuous-wave green laser for copper processing is investigated. The laser is produced by single-pass second-harmonic generation (SHG) of a narrow-linewidth fiber laser. Based on Sellmeier equations, the factors (e. Read More

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Heatwave distortion correction using an improved reference sample compensation method and multispectral digital image correlation.

Appl Opt 2021 May;60(13):3716-3723

Heatwave distortions, caused by unevenly distributed temperature and refractive index in the optical path, unavoidably occur in high-temperature digital image correlation (DIC) measurement. To eliminate these distortions, a multispectral DIC-aided reference sample compensation method is proposed. The proposed method first adheres a correcting transparent glass (decorated with fluorescent speckle patterns) onto the test specimen (sprayed with red speckle patterns). Read More

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Electrically controlled 1  ×  2 tunable switch using a phase change material embedded silicon microring.

Appl Opt 2021 May;60(13):3559-3568

Phase change material (GST) has recently emerged as a highly promising candidate for photonic device applications owing to its high optical contrast, self-holding bi-stability, and fast material response. Here, we propose and analyze a 1×2 tunable switch using a GST embedded silicon microring resonator exploiting high optical contrast during GST phase change and a high thermo-optic coefficient of amorphous phase GST. Our device exhibits high extinction ratios of 25. Read More

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High sensitivity temperature sensor based on a side-hole fiber.

Appl Opt 2021 Apr;60(12):3474-3481

This paper proposes a temperature sensor based on a side-hole fiber (SHF). The sensor is formed by single-mode fiber (SMF)-coreless fiber (CLF)-SHF-CLF-SMF fusion splicing. The SHF adopts the dislocation fusion splicing method to ensure that one air hole is exposed. Read More

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Simulation for measurement of lightning channel temperature using a dual-band high-precision lightning imaging spectrometer.

Appl Opt 2021 Apr;60(11):3192-3202

A dual-band high-precision lightning imaging spectrometer (DHLIS) is designed to capture the fine spectrum of transient lightning. DHLIS improves the theoretical spectral resolution limit to 10 and broadens the spectral range to 30-40 nm by employing double echelle gratings in the arms of a spatial heterodyne spectrometer. Four strong and three fine spectral lines are selected to retrieve the temperature of the lightning channel using the Boltzmann plot method. Read More

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Single-pixel imaging of high-temperature objects.

Appl Opt 2021 May;60(14):4095-4100

For visual measurement at high temperature, one challenge is how to reduce the radiation emitted by the high-temperature components themselves and the influence of hot gas flow on the image quality, which has a significant impact in fields such as aerospace or automotive manufacturing. Owing to the complicated optical imaging environment at high temperature, a new, to the best of our knowledge, image acquisition method of high-temperature components is proposed in combination with single-pixel imaging in this paper. A series of illumination patterns is emitted to the object, and the light waves measured by the single-pixel detector are used to reconstruct the image of the object. Read More

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Evolution of Two Types of ZnTe Magic-Size Clusters Displaying Sharp Doublets in Optical Absorption.

J Phys Chem Lett 2021 May 13:4762-4768. Epub 2021 May 13.

Engineering Research Center in Biomaterials, Sichuan University, Chengdu, 610065 Sichuan, P. R. China.

The two-pathway model proposed for colloidal semiconductor metal chalcogenide (ME) quantum dots (QDs) and magic-size clusters (MSCs) is demonstrated for ZnTe. Two new types of ZnTe MSCs have been found, which exhibit sharp optical absorption doublets peaking at 356/389 and 389/420 nm. Labeled dMSC-389 and dMSC-420, respectively, they were produced from reaction mixtures in 1-octadecene (ODE) of zinc oleate (Zn(OA)), tri--octylphosphine telluride (TeTOP), diphenylphosphine (HPPh), and acetic acid (HOAc, CHCOOH). Read More

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