A series of hybrid component based on reactive polyhedral oligomeric silsesquioxane(POSS) precusors and its reactive copolymers of PGMA were synthesized and utilized to nanobuild in epoxy. Reactive POSS and copolymer dispersed in homogenous in matrix, overcomed POSS-POSS interaction, which resulted in macroscale phase separation. The nanocomposites obtained were analyzed by Scanning electron microscopy, Transmission electron microscopy, X-ray scattering and dynamic mechanical. An analogue of POSS (denoted as POSSMOCA) was synthesized via addition reaction, which had reactive amino group bonding into epoxy network and improved the thermostability, because of the structural silicon, nitrogen and halogen. Epoxy/polyhedral oligomeric silsesquioxanes (POSS) hybrid composites were prepared from prereaction between trifunctional silanol POSS-OH and diglycidyl ether of bisphenol A (DGEBA) via silanol and the oxirane group. Reactive POSS-PGMA was polymerized via Reversible addition-fragmentation transfer polymerization. It was easy to tail the compatibility of the epoxide block copolymer with a step-growth polymerized matrix, to form nanostructure via reaction with PGMA segements. In the case of inert POSS-PMMA copolymers modified epoxy, topology of copolymer defined the final morphology and interaction between epoxy and them, because of directional hydrogen bonding and dilution effect. Tg of different epoxide conversion, obeyed of Gordon-Taylor equation and Kwei equation, k which reflected the interaction of modifier and DGEBA/MEDA and epoxy/amine oligomers, was consistent of the rheology and dynamic results.
Discrimination of the production sites of ancient pottery by using lead isotopic composition is discussed in this paper. We have determined the lead isotopic compositions of ancient pottery from the Jiahu and Xishan sites, Henan Province. Most of Jiahu pottery show 206Pb/204Pb of 18.0 to 18.4 and 208Pb/204Pb of 38.4 to 38.8, while most of Xishan pottery show 206Pb/204Pb of 18.6 to 18.8 and 208Pb/204Pb of 38.7 to 39.1. Therefore, the lead isotopes are useful in discriminating the production sites of the ancient pottery in some cases.
Objective: Chemotherapy-induced oral mucositis (CIOM) is an extremely serious complication of cancer. In China, the heat-clearing (Qingre) and detoxifying (Jiedu) traditional Chinese medicine QRJD-TCM gargle has been widely used to treat CIOM. To date, no systematic evaluation has been conducted on the clinical efficacy of QRJD-TCM gargle in treating CIOM. The objective of this systematic review and meta-analysis was to evaluate the efficacy of QRJD-TCM gargle in the treatment of CIOM. Methods: Relevant randomized controlled trials (RCTs) comparing QRJD-TCM gargle with conventional Western medicine mouthwash (CWMM) for CIOM were confirmed by systematically searching PubMed, Embase, Cochrane Library, China National Knowledge Infrastructure, Chinese Scientific Journal Database, Wanfang Database, and Sinomed until October 20, 2020. Two researchers independently assessed the risk of bias according to the Cochrane risk-of-bias criteria. Excel 2010 was used in setting up a database of extracted information, and RevMan 5.3.0 was used in analyzing included trial data. The composition of the QRJD-TCM gargle was evaluated. Results: A total of 25 articles were included in this meta-analysis. Results showed that compared with CWMM, QRJD-TCM gargle can reduce the incidence of CIOM (OR = 0.23, 95% CI [0.18, 0.29], p < 0.00001) and severity of CIOM (grade I–II: OR = 0.36, 95%CI [0.28, 0.46], p < 0.00001; grade III–IV: OR = 0.15, 95%CI [0.09, 0.28], p < 0.00001). In addition, QRJD-TCM gargle improved the effective rate of CIOM (OR = 15.91, 95% CI [7.93, 31.89], p < 0.00001). Conclusion: QRJD-TCM gargle is effective in preventing and treating CIOM. However, more standard, double-blind, and multicenter randomized controlled studies are needed to further confirm the efficacy of QRJD-TCM gargle in the prevention and treatment of CIOM.
The Otanri area in the central part of Kyeonggi massif, Korea, is composed of Precambrian gneisses that have been intruded by Jurassic to Cretaceous, felsic to mafic batholiths and stocks. U-Pb zircon ages for plutons in the Kyeonggi massif reported unpublished data. These ages are: Gongju migmatitic gneiss- 2413±21 Ma, Seongnam-Koyang migmatitic gneiss- 2417±39 Ma, Banded gneiss- 2163 Ma, Otanri gabbro- 166±1 Ma, Porphyritic granite- 165±2 Ma. On the basis of normative Qz-Or-Pl and Or-Ab-An diagrams, Gabbro plots monzogabbro region while the diorite plots in a diorite to a quartz diorite field. On the A-M-F diagram, the gabbro and diorite are a calc alkali rock series. The gabbro has high lithopile, HFS, zinc and low ferromagnesian and REE. On the the other hand diorite has high ferromagnesian, copper, REE and low lithophile. For the gabbro-diorite complex the REE characteristics of ΣREE, Eu/Sm and are 104.76 ppm to 139.59 ppm, 0.31 to 0.29 and 8.52 and 5.65 with no Eu(-) anomaly and thus indicate alkali basalt to andesitic composition. On silica diagram the plutons plot in subalkaline field. But on the alkalinity-silica diagram all plutonic rocks plot in the calc alkaline region. Based on the silica vs. trace element diagrams gabbro-diorite complex could have formed near volcanic arc or plate collision environments.
Petrographic characteristics (textural properties and modal compositions) have an intrinsic influence on the physical and mechanical (PM) properties of weakly cemented sandstones. Sixteen sandstone samples were tested to determine the PM parameters and then thin sections from those samples were used to measure the petrographic parameters. Petrographic parameters were analysed statistically to establish quantitative relationships between the petrographic characteristics and PM properties. Based on multiple linear regression (MLRA) and stepwise multiple regression analyses (SMRA), several multiple regression equations with significant petrographic variables were established for estimating the PM parameters of the sandstone. Results indicated that uniaxial compressive strength (UCS) and Young's modulus ( E ) were closely related to mean grain size (Mz) (φ-value), non-uniform coefficient (Cu), fractal dimension (F d ), Riley sphericity (Ψ p ), packing proximity (P p ), floating contacts (Fl), grain-to-grain contacts (G-G), feldspar content and organic matter content. An increased percentage of grain-to-cement contacts (G-C) and reduced percentages of grain-to-matrix contacts (G-M) and organic matter content indicated a high value of Poisson's ratio (POISS). In addition, Mz, C u , F d , Ψ p , quartz, feldspar, and organic matter contents were found to be significant parameters for density and P-wave velocity ( V p ). Furthermore, density and POISS could be predicted using the results from the MLRA and F d was a good predictor for density, V p and UCS using the results from the SMRA. Additionally, it was noted that the petrographic characteristics of roof sandstones had significant influence on the overburden pressure characteristics within the coal faces in the Shendong mining area.
This paper proposes a new genetic fuzzy approach, in which the traditional method for generating the initial population and the cross operator are improved. Our new method is tested on classifier fusion problem, and the experimental results show it outperform other classifier combination methods in the classification accuracy
At lane 20207 and lane 50207 of the 80207 working face of Sitai Mine, many small faults are exposed, and their extension is unknown, which causes great interference to safe and efficient mining and even normal production of the working face. In order to guide the rational transformation and safe and efficient production of the working face with science, Sitai Coal Mine commissioned Henan Polytechnic University to find out the extension of the exposed fault on the face and other geological anomalies by using geophysical exploration methods. According to the purpose of geophysical exploration in Sitai coal mine, combined with the geological conditions of the working face, the SUMMIT II EX type seismic channel wave exploration produced by DMT company of Germany is selected to explore the 80207 working face with the combined detection method of transmission and reflection. According to the detection results, combined with the existing hydrogeological data of Sitai mine, the relative channel wave anomaly area is delineated. The results show that the seismic channel wave exploration can provide a basis for the prevention and control of mine water disaster conveniently and effectively.
Graphite which occurs in the early Precambrian banded iron formation (BIF) (3.1x109yr) at Gongchangling, Anshan, China, can be divided into two genetic types on the basis of its modes of occurrence: biogenic and inorganic; the former occurs in garnet-mica-quartz schist and the latter in rich magnetite ore. The garnet-mica-quartz schist is located at the bottom of the formation. Its original rock is a volcanic tuff-bearing clayey siltstone. Graphite is fairly uniformly disseminated in the schist Chemical analysis of 20 samples of graphite yields an average content of 0.29±0.22%. The average δ13C value of 4 samples is -26.6 ±0.6‰ (PDB). Rich magnetite ore bodies occur in the form of lenses and layers within the banded magnetite quartzite, and wallrock alteration is also noticed. Graphitebearing rich magnetite ore is composed of magnetite, maghemite and minor graphite. Late chlorite and siderite are recognized locally. Disseminated graphite is generally distributed in scaly aggregates interstitial to the grains of magnetite, occasionally found within the grains of magnetite. It is non-uniformly distributed in the horizon of rich ore, mainly in the core. No graphite is found in the outer part of the rich ore, poor ore in the same horizon, wallrock near the rich ore and altered rock, indicating that graphite has a great bearing on the rich ore. Chemical analysis of 15 samples gives an average graphite content of 0.89±0.51%. The average δ13C value of 18 samples is-4.7 ±2.1%.(PDB). This kind of graphite seems to have been formed by the following reaction: 6 FeCO3=2Fe3O4 + 5CO2+C in the primary sedimentary siderite under the condition of amphibole-facies regional metamorphism.
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