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81.
Vo Ngoc Phu Vo Thi Ngoc Chau Vo Thi Ngoc Tran Nguyen Duy Dat 《Artificial Intelligence Review》2018,50(1):93-159
Emotion classification is used in many commercial applications and research applications. The semantic classification models (or sentiment classification methods) are based on the vocabulary of the emotion dictionary being studied and being used very much to this day. In this study, a Vietnamese sentiment dictionary includes Vietnamese terms (Vietnamese nouns, Vietnamese verbs, Vietnamese adjectives, etc.) which the valences (and polarities) are calculated by using Ochiai measure through Google search engine and many Vietnamese adjective phrases which the valences (and polarities) are identified based on Vietnamese language characteristics. The Vietnamese adjectives often bear emotion which values (or semantic scores) are not fixed and are changed when they appear in different contexts of these phrases. Therefore, if the Vietnamese adjectives bring sentiment and their semantic values (or their sentiment scores) are not changed in any context, then the results of the emotion classification are not high accuracy. We propose many rules based on Vietnamese language characteristics to determine the emotional values of the Vietnamese adjective phrases bearing sentiment in specific contexts. Our Vietnamese sentiment adjective dictionary is widely used in applications and researches of the Vietnamese semantic classification. 相似文献
82.
Dat T. Tran Deryn Chu Allen G. Oliver Scott R.J. Oliver 《Inorganic chemistry communications》2009,12(10):1081-1084
A three-dimensional Bi(III) based metal–organic framework was synthesized under hydrothermal conditions using the multidentate organic linker 3,5-pyridinedicarboxylate. Bismuth oxide 3,5-pyridinedicarboxylate, Bi2O2[NC5H3(CO2)2], contains embedded 1-D cationic bismuth oxide chains that propagate along the crystallographic c-axis. The oxygens of the Bi2O2 core are three-coordinate and bond strongly to the Bi atoms. Thermogravimetric analysis shows that the material possesses high thermal stability up ca. 400 °C before decomposing to phase-pure Bi2O3 at 800 °C. The structure, crystallinity, morphology and properties of the material are discussed. 相似文献
83.
Yasuo Iizuka Aya Kawamoto Kazuhiro Akita Masakazu Daté Susumu Tsubota Mitsutaka Okumura Masatake Haruta 《Catalysis Letters》2004,97(3-4):203-208
Recent X-ray photoelectron spectrometer(XPS) analysis of Au powder synthesized by evaporating high purity gold metal (> 99. 99%) in an inert gas detected impurity metals such as Ag and In at levels which far exceed those expected from the impurity levels of raw gold metal. Several samples of Au powder containing different amount of impurity metals were prepared to examine whether the activity of the Au powder for CO oxidation depends upon the impurity or not. The activity of the powder showed a strong correlation with the surface concentration of Ag. 相似文献
84.
An alternative approach to maintaining indoor air quality may be the biofiltration of air circulated within the space. A biofilter with living botanical matter as the packing medium reduced concentrations of toluene, ethylbenzene, and o-xylene concurrently present at parts per billion (volume) in indoor air. The greatest reduction in concentrations per pass was under the slowest influent air flux (0.025 m s(-1)); however, the maximum amount removed per unit time occurred under the most rapid flux (0.2 m s(-1)). There was little difference between the different compounds with removal capacities of between 1.3 and 2.4 micromol m(-3) biofilter s(-1) (between 0.5 and 0.9 g m(-3) biofilter h(-1)) depending on influent flux and temperature. Contrary to biofilters subjected to higher influent concentrations, the optimal temperatures for removal by this biofilter decreased to less than 20 degrees C at the most rapid flux for all three compounds. Microbial activity was decreased at these cooler temperatures suggesting the biofilter was not microbially limited but rather was limited by the availability of substrate. The cooler temperatures allowed greater partitioning of the VOCs into the water column which had a greater impact on removal than its reduction in microbial activity. 相似文献
85.
D. Chandra H. D. Shih F. Aqariden R. Dat S. Gutzler M. J. Bevan T. Orent 《Journal of Electronic Materials》1998,27(6):640-647
Void defects were demonstrated to form away from the substrate-epifilm interface during the molecular beam epitaxial growth
of mercury cadmium telluride on cadmium zinc telluride substrates. These were smaller in size compared to voids which nucleated
at the substrate-epifilm interface, which were also observed. Observations of void nucleation away from the substrate-epifilm
interface were related to the respective growth regimes active at the time of the void nucleation. Once nucleated, voids replicated
all the way to the surface even if the flux ratios were modified to prevent additional nucleation of voids. For a significant
number of films, void defects were observed co-located with hillocks. These voids were usually smaller than 1 μm and appeared
almost indistinguishable from unaccompanied simple voids. However, these void-hillock complexes displayed a nest of dislocation
etch pits around these defects upon dislocation etching, whereas unaccompanied voids did not. The nests could extend as much
as 25 μm from the individual void-hillock complex. The density of dislocations within the nest exceeded 5×106 cm−2, whereas the dislocation density outside of the nest could decrease to <2×105 cm−2. The void-hillock complexes formed due to fluctuations in growth parameters. Elimination of these fluctuations drastically
decreased the concentrations of these defects. 相似文献
86.
Xing Yi Ling Ruoxue Yan Sylvia Lo Dat Tien Hoang Chong Liu Melissa A. Fardy Sher Bahadar Khan Abdullah M. Asiri Salem M. Bawaked Peidong Yang 《Nano Research》2014,7(1):132-143
A novel Ag-alumina hybrid surface-enhanced Raman spectroscopy (SERS) platform has been designed for the spectroscopic detection of surface reactions in the steady state. Single crystalline and faceted silver (Ag) nanoparticles with strong light scattering were prepared in large quantity, which enables their reproducible self-assembly into large scale monolayers of Raman sensor arrays by the Langrnuir-Blodgett technique. The close packed sensor film contains high density of sub-nm gaps between sharp edges of Ag nanoparticles, which created large local electromagnetic fields that serve as "hot spots" for SERS enhancement. The SERS substrate was then coated with a thin layer of alumina by atomic layer deposition to prevent charge transfer between Ag and the reaction system. The photocatalytic water splitting reaction on a monolayer of anatase TiO2 nanoplates decorated with Pt co-catalyst nanoparticles was employed as a model reaction system. Reaction intermediates of water photooxidation were observed at the TiO2/solution interface under UV irradiation. The surface-enhanced Raman vibrations corresponding to peroxo, hydroperoxo and hydroxo surface intermediate species were observed on the TiO2 surface, suggesting that the photo-oxidation of water on these anatase TiO2 nanosheets may be initiated by a nucleophilic attack mechanism. 相似文献
87.
Nhung Hac Thi Truong Cong Doanh Doan Tien Dat Ho Thi Oanh Ha Tran Nguyen Tuyen Van Nguyen Quang Vinh Tran Mai Ha Hoang 《火与材料》2024,48(2):166-179
High fire-resistance polypropylene (PP) composites were prepared by using environment-friendly flame retardants including expandable graphite (EG), red phosphorus (RP), and magnesium hydroxide (MH). Synergism between EG, RP, and MH on the thermo-oxidation behavior and flame resistance of PP was found. The incorporation of MH and RP formed highly thermally stable mixtures of magnesium phosphates consisting of Mg3(PO4)2, Mg(PO3)2, and α-Mg2P2O7 at both amorphous and crystalline phases in the burning process. The mixture not only covered the surface of burning materials but also could reinforce the char structure of the PP/EG composites, thereby significantly enhancing the condensed phase flame retardant mechanism of the composites. Mass ratios of the flame retardants were also optimized to obtain the composite with the highest flame retardant efficiency. The result revealed that the combination of EG, RP, and MH in PP at MH/RP mass ratio of 3/2 with only a total additive content of 18 wt.% could make its limiting oxygen index (LOI) increase from 16.8% to 27.2% and the UL-94 rating was improved from none to V-0. In addition, the mechanical properties of the composites were improved via the surface treatment of MH and RP with calcium stearate and silicone oil, respectively. 相似文献
88.
89.
Zhenping Wang Nasir Ali Tien Dat Ngo Hoseong Shin Sungwon Lee Won Jong Yoo 《Advanced functional materials》2023,33(28):2301651
Even though atomically thin 2D semiconductors have shown great potential for next-generation electronics, the low carrier mobility caused by poor metal–semiconductor contacts and the inherently high density of impurity scatterings remains a critical issue. Herein, high-mobility field-effect transistors (FETs) by introducing few-layer PdSe2 flakes as channels is achieved, via directly depositing semimetal antimony (Sb) as drain–source electrodes. The formation of clean and defect-free van der Waals (vdW) stackings at the Sb–PdSe2 heterointerfaces boosts the room temperature transport characteristics, including low contact resistance down to 0.55 kΩ µm, high on-current density reaching 96 µA µm−1, and high electron mobility of 383 cm2 V−1 s−1. Furthermore, metal–insulator transition (MIT) is observed in the PdSe2 FETs with and without hexagonal boron nitride (h–BN) as buffer layers. However, the layered h–BN/PdSe2 vdW stacking eliminates the interference of interfacial disorders, and thus the corresponding device exhibits a lower MIT crossing point, larger mobility exponent of γ ∼ 1.73, significantly decreased hopping parameter of T0, and ultrahigh electron mobility of 2,184 cm2 V−1 s−1 at 10 K. These findings are expected to be significant for developing high mobility 2D-based quantum devices. 相似文献