FOLKLORE
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2006
·
IF 0
Christa A. Tuczay
This paper is a contribution to the ongoing debate about the origins of parallel motifs in The Arabian Nights and in ancient and medieval popular and learned literature about exotic lands of the East. This preliminary survey focuses on seven related motifs: the magnetic mountain, the congealed sea, flying griffins, automata and genies, the mysterious walled city, the living island, and the underground river. This paper is intended as a contribution toward a motif-Index of The Arabian Nights in order to facilitate further comparative study of the motifs involved.
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DOI
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 11
·6744-6754
·
IF 4.186
Zhihao Dong,Zhenyong Cen,Kezhen Hui,Ze Xu,Peiyao Zhao,Xiaohui Wang
With the goals of sustainable development adopted by more and more nations, the lead-free trend of multilayer ceramic actuators has become a widely recognized consensus. Sintering in a reducing atmosphere is a necessary approach for preparing lead-free ceramics co-fired with low-cost nickel internal electrodes. Herein, (1 − x )K 0.48 Na 0.52 Nb 0.96 Ta 0.04 O 3 – x Sr(Zr 0.5 Ti 0.5 )O 3 + 0.03ZrO 2 + 0.08MnO 2 (KNNT-SZT) ceramics were sintered in a reducing atmosphere using a solid-state reaction. The Sr(Zr 0.5 Ti 0.5 )O 3 (SZT) dopant decreased the Curie temperature T C and the O–T phase transition temperature. The enhanced diffuseness of the ferroelectric phase transition of KNNT-SZT ceramics is attributed to the element doping and the locally inhomogeneous microstructure. High inverse piezoelectric coefficients d 33 * of 883 and 787 pm/V were obtained for the 8- and 9-mol% SZT-doped samples, respectively. These results were attributed to the synergistic effect of ferroelectric domains with different sizes. The diffused O–T phase transition significantly improved the piezoelectric temperature stability of the 9-mol% SZT-doped sample, whose electric-field-induced strain decreased by <10% from room temperature (25°C) to 115°C. The cyclic fatigue test showed that >98% of the initial d 33 * was retained after 10 6 cycles of unipolar electrical loading. The KNNT-SZT ceramics sintered in a reducing atmosphere possessed excellent inverse piezoelectric properties and are expected to be applied in the field of multilayer ceramic piezoelectric actuators with base metal internal electrodes.
研究领域:
材料科学
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压电陶瓷
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电子材料
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陶瓷工艺
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可持续能源材料
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DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 5
·2425-2434
·
IF 6.7
Mengxi Tan,Chengye Yu,Hua Zeng,Chuanbao Liu,Wenjun Dong,Huimin Meng,Yanjing Su,Lijie Qiao,Lei Gao,Qipeng Lu,Yang Bai
Metal–organic frameworks (MOFs), as a class of semiconductor-like materials, are widely used in photocatalysis. However, the limited visible light absorption and poor charge separation efficiency are the main challenges restricting their photocatalytic performance. Herein, the type II heterojunction MIL-68(In)@ZIS was successfully fabricated by in situ growth of ZnIn2S4 (ZIS) on the surface of a representative MOF, i.e. MIL-68(In). After composition optimization, MIL-68(In)-20@ZIS shows an extraordinary photocatalytic hydrogen production efficiency of 9.09 mmol g−1 h−1 and good photochemical stability, which far exceeds those of most photocatalysts. The hierarchical loose structure of MIL-68(In)-20@ZIS is conducive to the adsorption of reactants and mass transfer. Meanwhile, a large number of tight 2D contact interfaces significantly reduce the obstruction of charge transfer, paving the way for high-perform photocatalytic hydrogen evolution. The experimental results demonstrate that the MIL-68(In)@ZIS heterojunction achieves intensive photoresponse and effective charge separation and transfer benefiting from unique charge transport paths of a type II heterojunction. This study opens an avenue toward MOF-based heterojunctions for solar energy conversion.
研究领域:
材料科学
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光催化
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可再生能源
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纳米材料
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太阳能转换
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DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
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2022
·
IF 5.443
Shuangshuang Zhao,Xuehang Wang,Narendra Kurra,Yury Gogotsi,Yu Gao
Two-dimensional (2D) niobium carbide, Nb 4 C 3 T x (T x : O, OH, and F), a representative member of the 43 MXene structural motif, has shown promising electrochemical performance in acidic electrolytes. The capacitive performance of Nb 4 C 3 T x in neutral aqueous electrolytes has been reported as moderate, but little effort has been made to improve it. In this paper, we report a method to introduce nanopores (pinholes) in Nb 4 C 3 T x MXene flakes by adjusting the etching time. The pinholes generated during the etching process improve ion diffusion pathways, which are otherwise hindered by the restacking of the 2D flakes. The “holey Nb 4 C 3 T x ” shows a 50 % improved rate capability at charge/discharge time scales of 1–2 s in 1 M Li 2 SO 4 , Na 2 SO 4 , and (NH 4 ) 2 SO 4 electrolytes. Our strategy of controlling the permeability of Nb 4 C 3 T x sheets can potentially be applied to other MXenes, providing guidance for improving the capacitance and rate capability of 2D materials.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 6
·1-7
·
IF 2.019
Wu Xueli,Qiu Jianhui,Liu Peng,Sakai Eiichi,Lei Lin
DENKA BLACK/polystyrene nanocomposites (DB/PS) were successfully prepared through a facile strategy. Some of the styrene molecules were grafted and polymerized onto the surface of the DB via the in situ free radical addition process in ionic liquid, and others self-polymerized and coated on the polystyrene grafted DB. The ionic liquid improves the grafting percentage because of its high viscosity. The electrical properties of polymer composites before and after the grafting were measured. It was found that the electrical conductivity of the DB/PS composites decreased with increasing amounts of monomer styrene and initiator 2, 2′-azobis (isobutyronitrile) (AIBN). The microstructure, morphology and thermal properties of the composites were characterized by Fourier transform-infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The results proved that the polystyrene had been successfully grafted onto the DB surface.
研究领域:
高分子化学
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纳米复合材料
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功能材料
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电学性能
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材料科学
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DOI
高影响因子
Magnetic Resonance Letters
·
2021
·
IF 0
Hui Ma,Christian M. Pedersen,Qi Zhao,Shiyu Jia,Bin Yuan,Xianglin Hou,Yingxiong Wang
Coal chemical wastewater (CCW) with the features of high toxicity and poor biodegradability is a big issue in environmental remediation, posing a great threat to aquatic ecosystems and to human beings. Such complex molecular mixtures are notoriously difficult to characterize without initial physical separation. Herein, we present the 3D diffusion ordered spectroscopy (DOSY) analysis for CCW using DOSY-COSY and DOSY-HSQC methods, the advantages of this strategy have been demonstrated in the analysis of mixtures of aliphatic oxygenates and aromatic compounds, before being implemented on a genuine CCW sample in this study. The results showed that 3D DOSY is a robust and reliable tool for providing superior resolution and virtual separation of complex pollutants, and can be used as a general approach for structural elucidation.
研究领域:
环境科学
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分析化学
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污染控制
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DOI
CARBOHYDRATE POLYMERS
·
2012
·
IF 3.628
Weiwei Lou,Hualin Zhang,Jianfeng Ma,Dafeng Zhang,Chuantong Liu,Siqian Wang,Zhennan Deng,Haihong Xu,Jinsong Liu
In this paper, the carboxymethyl chitosan/oxidized dextran hydrogel was developed and its potency application in the prevention of postoperative adhesion was investigated. The developed hydrogel showed porous and interconnected interior structure with pore size about 250 μm, which was sensitive to lysozymic solution (1.5 μg/ml) with almost complete degradation after 4 weeks of in vitro incubation. In vivo study suggested that the developed hydrogel showed the great capacity on the prevention of postoperative adhesions in rat model. According to the result of histopathological examination, it clearly showed that the mesothelial cell layer of abdominal wall and cecum were completely recovered after 7 days of surgery in 3% carboxymethyl chitosan/oxidized dextran hydrogel group, while obvious adhesion between abdominal wall and cecum was observed as treatment with saline solution or 3% carboxymethyl chitosan solution after 1 day of surgery. All these results suggested that the developed biodegradable hydrogel might have potential application in the prevention of postoperative adhesion.
研究领域:
生物材料学
·
医学
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DOI
高影响因子
JOURNAL OF SURGICAL RESEARCH
·
2009
·
IF 1.875
Ole Goertz,Stefan Baerreiter,Andrej Ring,Birger Jettkant,Tobias Hirsch,Adrien Daigeler,Hans U. Steinau,Stefan Langer
Background The breakdown of skin microcirculation and the leukocyte–endothelium interaction are assumed to play a key role in the pathophysiology of frostbite injuries. However, little is known as yet. The aim was to develop an in vivo frostbite model to monitor microcirculatory changes and angiogenesis after frostbite injury. Materials and Methods Deep partial thickness frostbite injuries were inflicted with a no-touch-technique to the ears of hairless mice ( n = 9). To this end, a gas jet of nitrogen vapor (T = –195,8 ± 2.7°C) was delivered onto an area of 1.9 mm 2 for 1,5 s. Intravital fluorescent microscopy in combination with FITC-dextran and Rhodamin 6 G as fluorescent dyes was used to assess microcirculatory changes, leukocyte behavior, and angiogenesis during the 14 d of wound healing. Results The area of no perfusion decreased significantly over the observed period, and perfusion was almost completely restored due to angiogenesis by d 14 (day 1: 1.89 [mm 2 ] ± 0.44SEM, d 14: 0.02 ± 0.01). No post-traumatic extension of the trauma could be observed. Edema formation increased significantly up to d 7. The number of adherent leukocytes showed a significant increase during the first 7 d. Functional vessel density showed a significant post-frostbite decrease to 60% of the baseline value. Conclusions This novel frostbite model provides a simple and nonetheless highly effective technique of creating locally limited reproducible frostbite injuries using a no touch technique. Tissue damage can be fully attributed to the thermal trauma, and the model allows repetitive intravital fluorescent microscopy of the microcirculation, leukocyte–endothelium interaction, and angiogenesis.
研究领域:
医学
·
生物学
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DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yiquan Fang,Huateng Li,Xiuli Wang,Mengjing Zhu,Jia Guo,Changchun Wang
Reflective display devices, especially for electrochromic photonic crystals (ECPCs), are of great interest to researchers due to their convenient control approach, wide color regulation range, fast response, and low power consumption. Herein, liquid colloidal crystals (LCCs) of SiO2 nanospheres were prepared through an evaporation-induced self-assembly method and used as a reflective unit for fabricating dynamic ECPC devices. The ECPC device exhibited brilliant controllable structural color across the visible spectrum under low voltages (<3.5 V). Based on the in situ ultra-small-angle X-ray scattering results and reflective spectra, regulatory rules of the dynamic ECPC device concerning a color tunable range, reflectance intensity, response speed, and cyclic performance were set up, and the relationship between slurry concentration, electrode spacing, and viewing angle was established. Furthermore, a dynamic mechanism was revealed for explaining the responsive behaviors of reflection spectra during the electrical modulation, which is significant for the development of ECPC devices in the future. Based on the parameter optimization and structure design of the dynamic ECPC device, a pressure-responsive electrochromic prototype device was constructed with rapid response, dynamic structural color, and good reversibility, which demonstrated its great potential in reflective display units and multifunctional sensors.
研究领域:
材料科学
·
显示技术
·
纳米科技
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DOI
高影响因子
ChemSusChem
·
2015
·Vol. 8
·期 9
·1601-1607
·
IF 7.657
Xing Tang,Zheng Li,Xianhai Zeng,Yetao Jiang,Shijie Liu,Tingzhou Lei,Yong Sun,Lu Lin
Graphical Two-faced copper: Methyl levulinate (ML) in the methanolysis products of cellulose is hydrogenated directly to γ-valerolactone (GVL) with methanol as the in situ hydrogen source over a nanocopper catalyst. The nanocopper catalyst plays a dual role in hydrogen production by methanol reforming and the subsequent hydrogenation of ML to GVL. In this work, the hydrocyclization of methyl levulinate (ML) to γ-valerolactone (GVL) was performed in MeOH over an in situ prepared nanocopper catalyst without external H 2 . This nanocopper catalyst served as a dual-functional catalyst for both hydrogen production by MeOH reforming and hydrogenation of ML. Nearly quantitative ML conversion with a GVL selectivity of 87.6 % was achieved at 240 °C in 1 h in MeOH under a nitrogen atmosphere. ML in the methanolysis products of cellulose also could be hydrogenated effectively to GVL over this nanocopper catalyst even in the presence of humins to give an ML conversion of 94.1 % and a GVL selectivity of 73.2 % at 240 °C in 4 h. The absorption behavior of humins on the surface of the nanocopper catalyst was observed, which resulted in a pronounced increase in the acidic sites of the nanocopper catalyst that facilitate ring-opening and the hydrocarboxylation/alkoxycarbonylation of GVL to byproducts.
研究领域:
生物化学
·
催化化学
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DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2020
·Vol. 85
·期 11
·3756-3763
·
IF 2.479
Lanlan Peng,Jiwang Chen,Lu Chen,Wenping Ding,Yonggui Gao,Yongning Wu,Youling L. Xiong
Cadmium (Cd) contamination in rice grain is common worldwide. This study investigated the effect of degree of milling (DM) on the reduction of Cd in cooked rice grain and porridge (rice-to-water ratios 1:1.6 and 1:10, respectively) and Cd in vitro bioaccessibility. Cd-contaminated rice grains with DMs of 20%, 15%, and 0% were cooked and then subjected to successive digestion in a gastrointestinal environment model. Simulated-digestion juices, including saliva, gastric juice, duodenal juice, and bile juice, were used. The degree of gelatinization of cooked rice was measured and the morphological characteristics of the grain were also examined. The results showed that the Cd in vitro bioaccessibility, although less than 50% in all samples, was gradually increased with an increase of DM. The detected Cd bioaccessibility was higher at half meals (reduced grain content) when compared with full meals (full grain content). As DM increased, the surface of cooked rice grain and porridge became smoother, and the amount of fiber, fat droplets, and starch granules were gradually decreased, whereas degree of gelatinization increased. The results indicate that DM affects the Cd in vitro bioaccessibility in cooked rice by altering the gelatinization of starch. Practical Application Degree of milling (DM) significantly influenced the in vitro bioaccessibility of cadmium (Cd) in cooked rice. This work may offer a potential solution to the rice grain with high Cd content because a limited DM will allow a low bioaccessibility of Cd.
研究领域:
食品安全
·
营养学
·
环境科学
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DOI
高影响因子
JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH-PART A-CURRENT ISSUES
·
2026
·
IF 2.4
Meng-Yi Chi,Cong-Ying Zhang,Xiao-Yan Gao,Jia Yu,Chun-Ying Bai,Dan-Dan Hao
The chemotherapeutic agent cisplatin for solid tumors frequently induces cancer-associated cachexia characterized by weight loss and decreased skeletal muscle mass. These adverse cisplatin-related symptoms are dose‑limiting, and the ability to counteract drug-initiated muscle atrophy in cancer-associated cachexia remains a pharmacological challenge. The aim of this study was to determine the protective efficacy of lobetyolin, a natural compound derived from Codonopsis pilosula, known to exert antioxidant, anti‑inflammatory, and anti‑apoptotic activities, against cisplatin-induced skeletal muscle wasting and subsequently elucidate a potential underlying molecular mechanism of action using a mouse model. Mice were injected with cisplatin (4 mg/kg, i.p. every other day, 4 doses in total) with concurrent oral lobetyolin (20 or 40 mg/kg daily) for 8 days. Lobetyolin inhibited cisplatin-induced reductions in body weight and grip strength, ameliorated gastrocnemius muscle atrophy, and preserved myofiber cross‑sectional area. Mechanistically, lobetyolin restored superoxide dismutase (SOD) activity and glutathione (GSH) levels while diminishing malondialdehyde (MDA) content in gastrocnemius muscle. Lobetyolin was found to activate the AKT signaling axis as evidenced by enhanced phosphorylation of AKT (Ser473) and FoxO3α (Thr32), which suppressed FoxO3α nuclear translocation and downregulated the E3 ubiquitin ligase Fbx32, thereby diminishing proteasomal protein degradation. Concurrently, lobetyolin normalized the Bax/Bcl‑2 ratio to inhibit myocyte apoptosis. These findings demonstrated that lobetyolin may be considered as a multi‑targeted therapeutic candidate to counteract oxidative injury, protein catabolism, and myocyte apoptosis initiated by cisplatin. Data suggest that lobetyolin’s potential as a safe adjunctive agent against chemotherapy‑induced muscle wasting might involve AKT/FoxO3α pathway.
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）