bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ferromagnetic insulating behavior at low temperature induced by Sn doping in the ceramic SrRuO3
Authors: Liu Yanliang , Zhang Zhe , Lv Jiecheng , Qian Peihua , Cai Hongling , Wu Xiaoshan 
Published: March 2021

AbstractEffects of Sn doping at Ru site on the structural, magnetic, and transport behavior of polycrystalline SrRu1−xSnxO3 (x ≤ 0.1) have been investigated here. Substitution of Sn4+ for Ru4+ remains the same crystal symmetry with that of Sn‐free SrRuO3, while induces the Ru(Sn)O6 octahedral distortions. Samples with the low doping concentration (x ≤ 0.08) show a metallic behavior at high temperature, while a metal to insulator transition occurs at low temperature. On the other hand, an insulator behavior is detected for sample with x = 0.1, which follows Arrhenius‐type process in the temperature range of 80–140 K and Mott's variable range hopping model in the temperature range of 140–300 K. Further, we find that Sn4+ has a significant effect on the magnetic behavior of Sn doping in SrRuO3 where ferromagnetic transition temperature and magnetic moment decrease rapidly due to octahedral distortion and site dilution.
Designing effective and stable S‐scheme RGO/AgVO3/AgBr hybrid with enhanced photocatalytic performance
Authors: Abulizi Abulikemu , Zhang Tao , Kadeer Kuerbangnisha , Tursun Yalkunjan , Talifur Dilinuer 
Published: March 2021

AbstractThe low separation of photogenerated electron‐hole pairs and cycle stability has been the main bottleneck which restricts the development of photocatalytic technology for water purification. Here, RGO/AgVO3composites were fabricated by photo‐ultrasonic assisted reduction method, and AgBr nanoparticles were assembled on the surface of RGO/AgVO3via an in situ ion exchange method. A series of characterization and experimental results indicated that the introduction of RGO influenced the growth of crystal phase for AgVO3nanorods, resulting that AgVO3nanorods became thicker and shorter with the increase in RGO content. Moreover, RGO could also work as a bridge to promote the migration of electrons, leading different improvement for photocatalytic activity. Furthermore, in situ growth of AgBr on the surface of AgVO3nanorods could prevent its agglomeration and exfoliation, thus improving the photocatalytic activity and cycle stability of composites. RGO1%/AgVO3/AgBr30%exhibited excellent photocatalytic activity and stability for methylene blue (MB) degradation due to its unique structure, and its removal ratio reached at 96.2% within 50 min. Meanwhile, the separation of photogenerated electron‐hole pairs of AgVO3was markedly improved due to the introduction of RGO and AgBr. Based on the trapping experiments and theoretical calculation of band gap, a possible S‐scheme photocatalytic mechanism for improved photocatalytic activity was proposed.
Efficient red and broadband near‐infrared luminescence in Mn2+/Yb3+‐doped phosphate phosphor
Authors: Dong Langping , Zhang Liang , Xu Yonghui , Yin Shuwen , You Hongpeng 
Published: March 2021

AbstractIn this work, we report a novel phosphor LSPO:Mn2+ that exhibits red emission at about 616 nm and pleasant broad near‐infrared (NIR) emission at about 800 nm with a full width at half maximum (fwhm) of 112 nm. The structure and spectra show that the doped manganese ions occupy two kinds of Sc sites forming Mn1 and Mn2 emission centers, which are responsible for red and NIR emission, respectively. The XPS and low‐temperature fluorescence spectra reveal that both red and NIR emissions come from the Mn2+ ions. Besides, NIR luminescence is improved by doping Yb3+ in LSPO:Mn2+, leading to the broadened NIR emission range (700‐1100 nm) and enhanced luminescent thermal stability. Our results suggest that the prepared LSPO:Mn2+ and LSPO:Mn2+,Yb3+ phosphors offer the potential applications as red and NIR components in phosphor‐converted white‐light‐emitting diodes (pc‐WLED) and broadband NIR pc‐LED. Meanwhile, this work provides a new way to design novel broadband NIR phosphors.
Surface plasmon resonance‐induced Ag‐BaTiO3 composites for catalytic performance
Authors: He Zemin , Yu Ping , Wang Haiyang , Gao Jianjing , Zhao Yang , Zhang Haiquan , Zhao Yuzhen , Miao Zongcheng 
Published: March 2021

AbstractFerroelectric BaTiO3 was combined with Ag nanoparticles for piezocatalytic and photocatalytic viewpoints. Microstructural characterization (X‐ray diffraction and electron microscopy images) revealed that the Ag was successfully bounded with BaTiO3. X‐ray photoelectron spectrum also confirmed the presence of Ag. Further, its performance was examined for dye degradation under visible light (for photocatalysis) and ultrasonication (for piezocatalysis). In both the catalysis processes, there was a significant improvement in Ag‐loaded BaTiO3 sample‐based catalytic reactions. Catalytic performance was evaluated for multiple cycles and was found consistent. Scavenger tests were also performed to understand catalytic reactions.
Charge transfer band excitation of La3NbO7:Sm3+ phosphors induced abnormal thermal quenching toward high‐sensitivity thermometers
Authors: Hua Yongbin , Kim Jung‐Uk , Yu Jae Su 
Published: March 2021

AbstractDifferent luminescent behaviors of La3NbO7:Sm3+ phosphors under the excitations of charge transfer band (CTB, 250 nm) and featured absorption peak (6H5/2 → 4H7/2, 405 nm) of Sm3+ ions were demonstrated. Under the excitation wavelength of 405 nm, the optimal La3NbO7:0.1Sm3+ phosphor exhibited an orange‐red emission while the chromatic coordinate was found to be (0.609, 0.387), which also showed the excellent thermal performance, exhibiting its emission intensity of about 90.67% at 423 K with respect to 303 K. In the case of CTB excitation, the La3NbO7:0.1Sm3+ phosphor emitted an orange‐yellow region with the chromaticity coordinate of (0.540, 0.443), and the emission intensity was stronger than the above one (λex =405 nm) even though the optimized sample would be changed to the La3NbO7:0.05Sm3+ phosphor. With the increase of temperature, the obtained sample revealed an abnormal thermal quenching phenomenon between the emission peak of the host material and the emission transition of 4G5/2 → 6H9/2 under the excitation wavelength of 250 nm, which could be suggested to turn into a pair of thermal‐couple levels. Therefore, the sensing sensitivity of the obtained sample was further investigated based on the fluorescence intensity ratio theory. Eventually, the absolute and relative sensing sensitivities of the La3NbO7:0.01Sm3+ phosphor were estimated to be as high as 5.379 × 10−2 K−1 and 1.60% K−1, respectively.
Simultaneously achieved high‐energy storage density and efficiency in (K,Na)NbO3‐based lead‐free ferroelectric films
Authors: Huang Yu , Shu Liang , Zhang Suwei , Zhou Zhen , Cheng Yue‐Yu‐Shan , Peng Biaolin , Liu Lisha , Zhang Yuanyuan , Wang Xuping , Li Jing‐Feng 
Published: March 2021

AbstractWith the development of advanced electrical and electronic devices and the requirement of environmental protection, lead‐free dielectric capacitors with excellent energy storage performance have aroused great attention. However, it is a great challenge to achieve both large energy storage density and high efficiency simultaneously in dielectric capacitors. This work investigates the energy storage performance of sol‐gel‐processed (K,Na)NbO3‐based lead‐free ferroelectric films on silicon substrates with compositions of 0.95(K0.49Na0.49Li0.02)(Nb0.8Ta0.2)O3‐0.05CaZrO3‐xmol% Mn (KNN‐LT‐CZ5‐xmol% Mn). The appropriate amount of Mn‐doping facilitates the coexistence of orthorhombic and tetragonal phases, suppresses the leakage current, and considerably enhances the breakdown strengths of KNN‐LT‐CZ5 films. Consequently, large recoverable energy storage density up to 64.6 J cm−3with a high efficiency of 84.6% under an electric field of 3080 kV cm−1are achieved in KNN‐LT‐CZ5‐5 mol% Mn film. This, to the best of our knowledge, is superior to the majority of both the lead‐based and lead‐free films on silicon substrates and thus demonstrates great potentials of (K,Na)NbO3‐based lead‐free films as dielectric energy storage materials.
Enhanced luminescence and thermal stability of (Sr,Ca)AlSiN3:Eu2+ via superficial organic carbon modification
Authors: Tian Junhang , Zhuang Weidong , Liu Ronghui , Liu Yuanhong , Chen Guantong , Chen Siwei , Jiang Ze 
Published: March 2021

AbstractThe Eu2+‐activated nitride phosphors have been widely used in solid‐state lighting, but the applications in high‐power white‐light‐emitting diodes (wLEDs) field require higher thermal stability of luminescent materials. The oxidation of Eu2+ and the damage of nitride host in the Eu2+‐activated nitride phosphors are the two crucial reasons for the luminescence loss while operating. A superficial organic carbon modification is performed on the red‐emitting (Sr,Ca)AlSiN3:Eu2+ phosphor via the incorporation of organic carbon by solution mixing and thermal post‐treatment under the N2‐H2 atmosphere. After the superficial organic carbon modification, the oxidation of Eu2+ and the formation of impurity phases on the phosphor surface are effectively reduced. When the superficial organic carbon modified sample was treated in the 2 wt.% sucrose solutions, the relative brightness is strengthened by 2.15%, the thermal quenching characteristic is improved by 8.9% at 300℃, and the aging test results show an excellent thermal stability. All above indicate that the superficial organic carbon modification is a promising technique to enhance the thermal stability of analogous Eu2+‐activated nirtide phosphors.
Synthesis of ultrafine silicon carbide nanoparticles using nonthermal arc plasma at atmospheric pressure
Authors: Wang Cheng , Zhou Jiawen , Song Ming , Lu Zhongshan , Chen Xianhui , Zheng Yan , Xia Weidong 
Published: March 2021

AbstractIt remains a significant challenge for the scalable production of ultrafine silicon carbide (SiC) nanoparticles with sizes smaller than 10 nm. In this work, a novel process based on atmospheric nonthermal arc plasma was proposed for the continuous synthesis of ultrafine SiC nanoparticles. This low‐cost and scalable technique allows preparation of SiC nanoparticles with small size (5–9 nm) and narrow size distribution via hexamethyldisilane (HMDS) decomposition in an argon/hydrogen plasma environment. The as‐synthesized products were carbon‐rich β‐SiC nanoparticles with plentiful functional groups on the surface. The addition of hydrogen in plasma gas can tune the product characteristics, such as decreasing particle size, improving crystallinity, and reducing carbon and oxygen contents. Moreover, the as‐prepared β‐SiC nanoparticles had a high band gap (around 2.5 eV), and their photoluminescence peak showed an obvious blueshift relative to that of bulk β‐SiC, which was mainly attributed to the quantum confinement effect induced by their ultrafine size. According to the spectral information of arc plasma, the formation of SiC nanoparticles in the plasma was discussed.
Assessing glass‐ceramic homogeneity and nucleation self‐correlation by crystallization statistics
Authors: Ramírez Acosta María Helena , Raphael Rodrigues Lorena , Guarin Castro Edgar David , Dutra Zanotto Edgar 
Published: March 2021

AbstractIn this work, we implemented and tested a statistical method to evaluate the microstructural uniformity of partially crystallized glasses employing the aggregation index (R‐index), a parameter derived from the Poisson distribution function, which has mainly been used in Ecology studies. Since the crystal nucleation rate strongly depends on the chemical composition, the spatial crystal distribution in glass‐ceramics can be used to infer their chemical homogeneity. We also tested the hypothesis, advanced by some authors, of preferential secondary nucleation close to preexisting crystals (even in chemically homogeneous samples). To this end, we conducted a nearest‐neighbor statistical analysis of the spatial crystal distribution in partially crystallized Li2Si2O5 and Ba5Si8O21 glasses, used as model materials, by inspecting optical micrographs obtained at different magnifications. The resultant R‐indexes indicate a very high degree of homogeneity of the crystal number distribution, reflecting the uniform distribution of the chemical elements in the parent glasses. Moreover, the results for both glasses refute the suggestion that crystal nucleation is self‐correlated. These outcomes allow us to suggest the R‐index as a valuable and easily implemented tool to evaluate the chemical homogeneity of glasses that undergo internal nucleation, such as those used for glass‐ceramics.
The effects of the solution reactant concentration and temperature on the preparation of Pr3+:BaF2 transparent ceramics
Authors: Liu Xinwen , Zhou Zhiwei , Li Weiwei , Yang Yu , Mei Bingchu 
Published: March 2021

AbstractBarium fluoride (BaF2) crystals are attracting much attention as efficient inorganic scintillator promising for high‐energy physics, industrial inspection, and other fields because of the fast component of the decay time (0.6 ns) and high radiation resistance. However, two major drawbacks limit its practical application: (i) a slow decay time of ~600 ns is derived from self‐trapping excitons; (ii) the absolute light yield from the fast luminescence component is not competitive. The introducing of rare earth ions and preparation of BaF2 polycrystalline ceramics is considered to be effective measures to solve these bottlenecks. Pr3+ is extremely suitable as the activated ion of scintillation materials, which possess emission peaks located in visible band and the faster 5d–4f transition. In this work, highly sinterable Pr3+:BaF2 precursor powder was synthesized via the coprecipitation method by adjusting the reactant concentration and temperature. The morphology and microstructure of as‐synthesized powders were characterized using scanning electron microscopy (SEM) and transmittance electron microscopy analysis. The 5 at.% Pr3+:BaF2 transparent ceramic with a transmittance of 50.7% at the wavelength of 500 nm was fabricated by hot pressing the as‐prepared powders at 900°C for 4 h under the axial pressure of 50 MPa. The SEM images of ceramic cross‐section show that the residual pore is the main light scattering source. The absorption and emission spectrum of ceramic samples were discussed.
A synergistic model of stress and oxidation induced damage and failure in silicon carbide‐based ceramic matrix composites
Authors: Santhosh Unni , Ahmad Jalees , Ojard Greg , Gowayed Yasser 
Published: March 2021

AbstractA micromechanics‐based modeling approach that allows for the simultaneous consideration of deformation, damage, and oxidation associated with each constituent of silicon carbide (SiC)‐based ceramic matrix composites (CMC), including the fiber, fiber coating, and matrix, is described. Chemical kinetics models from the literature are combined with a progressive damage model. Rupture predictions of unnotched and notched stress‐hold (creep) specimens are compared with experimental measurements from a SiC/SiC CMC to assess the efficacy of the modeling approach. Techniques of improving creep rupture life are explored using the model.
Self‐propelling nanomotor made from halloysite and catalysis in Fenton‐like reaction
Authors: Wang Jian , Zhang Yan , Ning Weikun , Zhang Peiping , Jin Bo , Wang Yan , Zhang Wei , Li Wenqing , Wei Cundi , Miao Shiding 
Published: March 2021

AbstractA new class of catalytically self‐propelled nanomotors were fabricated by modifying natural clay tubes, halloysite, with randomly distributed particles of MnO2 and Fe3O4. The prepared MnO2–Fe3O4/HNTs composites were validated to be efficient Fenton catalysts in the degradation of rhodamine B (RhB). Compared to the previous preparation of rolled‐up microtubes or other template‐assisted syntheses, this strategy has its merits in utilizing clay minerals of abundance, cheap‐price, and no complex instruments needed. The nanomotors were able to be prepared on a large scale. The MnO2–Fe3O4/HNTs motors displayed powerful autonomous movement, and a high velocity of up to 380 µm s−1 was achieved in 5.0 wt. % H2O2 solution. For Fenton catalysis of RhB, the removal ratio of 94% dye molecules was obtained within 30 min, which was triply higher than other samples of the nonpropelling sample Fe3O4/HNTs. The autonomous movement provided adsorptive bubble separation, and the adsorption capacity was greatly enhanced by halloysite. These synergistic effects boosted the removal efficiency of dye molecules. The presence of magnetic MnO2–Fe3O4 made these motors move directionally in external magnetic fields and provided a facile recovery for collecting heterogeneous catalysts.
A threshold heating rate for single‐stage heat treatments in glass‐ceramics containing seed formers
Authors: Zandona Alessio , Groß Christoph B. M. , Rüdinger Bernd , Deubener Joachim 
Published: March 2021

AbstractThe development of glass‐ceramic materials is often achieved using an elementary microstructural strategy that splits the tasks of seed formation and functionality between two types of crystals. This strategy requires customized time‐temperature ceramization protocols, which have been so far implemented using empirical parameters. Here, a more fundamental approach is proposed: the extent of overlap Oe between seed formation and volume crystallization is evaluated by calorimetric and dilatometric measurements, targeting the computation of a threshold heating rate qt for effective single‐stage heat treatments. The applicability of this novel parameter is tested in TiO2‐doped lithium magnesium aluminosilicate glass‐ceramics, whose seed formation stage is thoroughly characterized by Raman spectroscopy and STEM. High‐temperature X‐ray diffraction demonstrates that insufficient seeding results in potentially weaker performances of the final products, due to large sizes and silica deficiency of the functional quartz solid solution crystals.
Registry of the Egyptian specialized hypertension clinics: Sex‐related differences in clinical characteristics and hypertension management among low socioeconomic hypertensive patients
Authors: Abdel Aal Amr , Youssef Ghada , El Faramawy Amr , El Remisy Dalia , El Deeb Heba , El Aroussy Wafaa , Ibrahim M. Mohsen 
Published: March 2021

AbstractHypertension is a major modifiable risk factor for cardiovascular disease (CVD) which is a leading cause of death in developing countries affecting both genders. Gender dissimilarity in clinical characteristics and hypertension (HTN) management among hypertensive patients has been reported in several reports before. The aim was to detect sex differences in clinical characteristics and HTN management among Egyptian hypertensive patients. Data from 4701 hypertensive patients attending 9 university located Specialized Hypertension clinic (SHC) were collected from October 2014 to September 2017. The collected data included demographics, cardiovascular risk profile, hypertension‐related history, anthropometric and blood pressure (BP) measurements, antihypertensive medications used, number of patients attending the follow‐up visits, and HTN control rate. Females represented 58.5% of the recruited patients, they were younger, with higher BMI, lower education level, and employment rate compared with males. Females had lower mean office systolic and diastolic BP than males (144.2 ± 22.6 vs. 146.5 ± 22.0 mmHg and 88.1 ± 13.0 vs. 89.9 ± 12.6 mmHg, respectively) and lower rate of uncontrolled BP (54.8% vs. 61.1% in males P < .001). Antihypertensive drugs were comparable among both sexes except for angiotensin converting enzyme inhibitors which were more prescribed in males. Compliance to antihypertensive medications was better in females (63.6% vs. 60.1% in males, P = .015). To conclude, Egyptian hypertensive females have different clinical characteristics as compared to their counterpart males with better BP control, adherence to antihypertensive medications, lower systolic and diastolic BP, and no major differences in the prescribed antihypertensive distribution.
Sulforaphane prevents angiotensin II‐induced cardiomyopathy by activation of Nrf2 through epigenetic modification
Authors: Su Xuling , Wang Shudong , Zhang Haiying , Yang Ge , Bai Yang , Liu Pinyi , Meng Lingbin , Jiang Xin , Xin Ying 
Published: April 2021

AbstractNuclear factor erythroid 2‐related factor (Nrf2) is an important regulator of cellular antioxidant defence. We previously showed that SFN prevented Ang II‐induced cardiac damage via activation of Nrf2. However, the underlying mechanism of SFN’s persistent cardiac protection remains unclear. This study aimed to explore the potential of SFN in activating cardiac Nrf2 through epigenetic mechanisms. Wild‐type mice were injected subcutaneously with Ang II, with or without SFN. Administration of chronic Ang II‐induced cardiac inflammatory factor expression, oxidative damage, fibrosis and cardiac remodelling and dysfunction, all of which were effectively improved by SFN treatment, coupled with an up‐regulation of Nrf2 and downstream genes. Bisulfite genome sequencing and chromatin immunoprecipitation (ChIP) were performed to detect the methylation level of the first 15 CpGs and histone H3 acetylation (Ac‐H3) status in the Nrf2 promoter region, respectively. The results showed that SFN reduced Ang II‐induced CpG hypermethylation and promoted Ac‐H3 accumulation in the Nrf2 promoter region, accompanied by the inhibition of global DNMT and HDAC activity, and a decreased protein expression of key DNMT and HDAC enzymes. Taken together, SFN exerts its cardioprotective effect through epigenetic modification of Nrf2, which may partially contribute to long‐term activation of cardiac Nrf2.
Recruiting and training multilingual family therapists: A content analysis of COAMFTE‐accredited marriage and family therapy program websites
Authors: Lebensohn‐Chialvo Florencia , Kalafut Meaghan J. , Hernandez Sergio Felipe , Trejo Andrea N. 
Published: March 2021

AbstractAmong U. S. Limited English Proficiency (LEP) communities, language needs and preferences create significant barriers to accessing quality healthcare and contribute to growing physical and mental health disparities. To mitigate these barriers, it is critical to recruit and train a new generation of linguistically diverse providers, including marriage and family therapists (MFTs). This study examined how Marriage and Family Therapy (MFT) program website content promotes a commitment to recruiting and training multilingual MFTs. The study sample consisted of all currently accredited programs (N = 122) and included coding for the presence or absence of (a) an explicit commitment to multiculturally and linguistically informed training, (b) specialized multilingual training and supports, and (c) multilingual faculty involved in training multilingual students or engaged in related scholarship. Results indicate that a majority of MFT programs are communicating a commitment to multiculturally informed training, but the same is not true of linguistically responsive training.