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As hydrogen energy, a clean energy source, is to be developed and utilized on a large scale, the construction of long-distance hydrogen pipelines and related stations along the route is also increasing. To study the dispersion patterns of hydrogen leakage under different conditions, a three-dimensional FLACS model of the hydrogen station was established. Simulations of hydrogen leakage and dispersion were conducted under different leakage pressures, leakage apertures, and leakage temperatures in the presence of obstacles. The dispersion ranges of flammable gas clouds were compared, and the influencing factors were analyzed. The results show that obstacles cause changes in the direction of hydrogen leakage, leading to a rapid increase in the dispersion range. In scenario 7, within 7 s (8 s to 15 s), the area of the flammable gas cloud rapidly increases to 73.3% of the entire station area. The increase of leakage pressure and leakage aperture both result in a larger dispersion range of the flammable gas cloud. For low-pressure leakage at 4 MPa, the change in leakage aperture has a more significant impact, while for large aperture leakage at 100 mm, the change in leakage pressure has a more significant impact. When the leakage temperature increases from 293 K to 353 K, the thermal motion of hydrogen molecules accelerates, but the change in leakage temperature does not significantly affect the dispersion range of the gas cloud. This study can provide a reference for the prevention and control of leakage accidents in hydrogen station. [ABSTRACT FROM AUTHOR]

Copyright of Nonferrous Metals (Mineral Processing Section) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Document level event extraction faces two major challenges: argument dispersion and multiple events. Most existing work adopts the method of extracting candidate arguments sentence by sentence, which makes it difficult to model contextual information across sentences. Therefore, this paper proposed a document level event extraction model based on multi granularity readers and graph attention networks. It used multi-granularity readers to achieve multi-level semantic encoding, and used the graph attention network to capture local and global relations between entity pairs. It constructed a pruned complete graph based on entity pair similarity as a pseudo trigger to comprehensively capture events and arguments in the document. Experiments conducted on the public datasets of ChFinAnn and DuEE-Fin show that the proposed method improves the problem of argument dispersion and enhances model s event extraction performance. [ABSTRACT FROM AUTHOR]

Copyright of China Rubber Industry is the property of Editorial Office of China Rubber Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Due to the huge capacities of computing and storage resources, wide-area distributed computing environment has become important infrastructures supporting computing power and data interconnection. In wide-area distributed computing environment, matching of tasks and resources is important to improve system performance. However, the diversity of tasks and resources and the geographical dispersion of resources increase the complexity of matching problems. To solve the problems of high response delay and low matching efficiency, a dynamic bidirectional matching method of tasks and resources oriented to wide-area distributed computing environments is proposed. The matching process is simplified and the response delay is mitigated by building a unified task requirement model and resource capability model. Moreover, the task-oriented and resource-oriented matching degrees are defined to express the preference of task-perspective and resource-perspective; the two-side comprehensive matching degree of tasks and resources is defined by the trade-off of the task-oriented and resource-oriented matching degree. The two-side comprehensive matching degrees are dynamically calculated for each task group and the resources to improve the matching quality. The experimental results show that the proposed method can effectively promoting the matching quality and significantly reduce the response delay compared with the existing methods. [ABSTRACT FROM AUTHOR]

Toluene was indirectly oxidized and absorbed by micro-nano bubble gas-liquid dispersion system coupled with ceramic membrane. The effects of initial pH of the absorption liquid, toluene concentration and flow rate on the oxidation and absorption efficiencies of toluene were investigated, and the reaction mechanism was also studied. The results showed that the absorption of toluene in the neutral solution was the best, and the absorption efficiencies decreased with the increase of toluene concentration and gas flow rate. Under the optimal conditions of pH 7.00, toluene concentration 256.06 mg/cm³ and gas flow rate 150 mL/min, the absorption efficiency of toluene reached 95.98%. In addition, the degradation products and mechanism analysis showed that ⋅ OH released by micro-nano bubbles oxidized and degraded toluene to form CO2 and water, and it was absorbed in the liquid phase. [ABSTRACT FROM AUTHOR]

Copyright of China Rubber Industry is the property of Editorial Office of China Rubber Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to enhance dispersity and compatibility of the carbon nanomaterials in polar/non polar solutions and polymers, carbon nanotube and graphene were modified using ethyl acetate as a monomer by free radical polymerization. The effects of coatings on carbon nanomaterials were characterized by infrared spectra, thermogravimetric analysis, scanning electron microscope, and Raman spectrum. Through infrared spectra, the coated carbon nanomaterial exhibited a characteristic absorption peak of vinyl acetate, and a significant weight loss occurred at 170~240 °C in the thermogravimetric curves. From Raman spectrum, the ID/IG of the modified carbon nanotubes and graphene decreased from 1.730 and 1.040 to 1.090 and 0.985, respectively, indicating an increase in the degree of graphitization. The results indicate the success of vinyl acetate modified carbon nanomaterials. Dispersity and compatibility of modified carbon nanomaterials were assayed by ultraviolet spectra, discovering that the coated carbon nanomaterials exhibit excellent dispersibility and stability. The results indicated that the surfaces of carbon nanomaterials were coated by polyvinyl acetate via in-situ polymerization. The structures of carbon materials were not destroyed by coating process and their properties were kept. When the mass ratios of polyvinyl acetate to carbon materials were 1:1 and 2:1, the results of coating were excellent. Furthermore, the modified carbon nanomaterials possessed the perfect dispersity and stability. [ABSTRACT FROM AUTHOR]

ZnGaMnOx With different Zn/Ga/Mn molar ratios were prepared by the sol-gel method, and SAPO-34 nanocrystals with a size of about 250 nm and good dispersion were synthesized by the seed-assisted method. The ZnGaMnOx/SAPO-34 bifunctional catalysts were physically milled to form ZnGaMnOx/SAPO-34, and their CO2 hydrogenation performance was investigated. The effects of the oxide preparation method and the molar ratio of the three elements Zn/Ga/Mn on the catalytic performance of ZnGaMnOx/SAPO-34 were investigated. The result showed that when Zn/Ga/Mn =5: 14: 6, the CO2 conversion of ZnGaMnOx/SAPO-34 was 17.1%, the CO selectivity was 67.7% and the lower olefin selectivity was 66.2%. [ABSTRACT FROM AUTHOR]

In order to simplify the initiation structure and improve the reliability of the fuse warhead matching system, the circumferential six-line initiation method of directional warhead was proposed to replace the central initiation. Based on the theory of fluid dynamics, the impact of the detonation wave under the circumferential six-line initiation was analyzed. Numerical simulation was carried out by LS-DYNA and warhead static explosion test was performed. The results show that, compared with the central initiation, the acceleration process of the fragment under the circumferential six-line initiation is related to the circumferential position, and there is a secondary acceleration process; Mach detonation waves are generated near the symmetry plane of adjacent detonation points, with a local pressure of up to 44.2CPa and covering at the center of the warhead, and the pressure is over 100 CPa at the center. The influence of the end face sparse wave is weakened by the axial multi-point initiation, the fragment velocity is increased, and the consistency of the axial fragment velocity is obviously improved. The accuracy of the numerical simulation is verified by warhead sample test, and the dispersion velocity error of fragment is within 8.1%, the initial velocity gain of fragments in different regions can reach 4.6% to 9.9%, indicating that the circumferential six-line initiation mode is an effective way to replace the central initiation of warhead. [ABSTRACT FROM AUTHOR]

A new type phosphate-based water reducer was synthesized by using polyethylene glycol monomethyl ether as the main chain and phosphoric acid as the terminal adsorption group. IR and GPC analysis were carried out. The dispersibility, clay sensitivity, influence of cementon adsorption property and its application performance were tested. The results show that when the molecule of new phosphate-based water reducing agent PE is 30~120 minutes, it is less affected by cement hydration, exhibits strong dispersion and retention ability, and has lower clay sensitivity. When montmorillonite is present, the addition of PE to concrete has a certain improvement effect in initial dispersion and flowability, and does not cause strength loss. [ABSTRACT FROM AUTHOR]

Based on the fractional-order thermo-electric-elastic theory and the Legendre polynomial series method, a mathematical model for guided wave propagation in functionally graded hollow cylinders was established. The effects of the fractional order, the piezoelectric effect, and the radius-thickness ratio on the wave propagation, especially on its attenuation, were discussed. The numerical analysis results indicate that, the piezoelectric effect on attenuation mainly concentrates near the cutoff frequency and the mutation frequency, and causes the mutation frequency to shift forward. The fractional order has a great impact on the phase velocity and attenuation of the thermal wave mode, and has an opposite impact on the phase velocity around the crossover frequency point where the crossover mode occurs with the thermal wave velocity. But the thermal wave attenuation gradually decreases with the fractional order. Meanwhile, the 1st longitudinal mode attenuation is suppressed by the piezoelectric effect. However, the attenuation of other modes significantly increases, and the impact of the electrical open circuit is greater than that of the electrical short circuit. [ABSTRACT FROM AUTHOR]

Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to improve the efficiency of particle-based fluid surface reconstruction, this paper proposed a perspective-grid-based adaptive narrow-band surface particle extraction method. Compared with the object-space-based method, this scheme adaptively extracted the surface particles closest to the viewpoint within the frustum according to the particle density, dispersion coefficient, so that the number of surface particles and memory consumption were related to the visible surface area, rather than the entire fluid surface or simulation domain. In addition, this paper presented an adaptive thickness estimation method based on particle density by taking advantage of the arrangement of perspective grids along the view. Experiments show that this scheme effectively reduces surface particles by 40% to 76% and memory overhead by 30% to 50%,solves the problems of surface particle redundancy and holes, and quickly obtains thickness information at a lower cost. This scheme brings significant performance improvement for surface reconstruction and rendering, and can better handle the surface reconstruction and rendering of large-scale particle sets. [ABSTRACT FROM AUTHOR]

The non-covalent interactions and elastic tensors of hexanitrohexazaza-isowurtzitane (γ-CL-20), triamino-trinitro-benzene (TATB) and cyclotetramethylene tetranitramine (HMX) were calculated based on density functional theory (DFT) by adjusting different dispersion correction methods. The effect of dispersion correction interactions on the elastic tensor of HMX was investigated. The results show that the intermolecular London dispersion interaction is higher than the other intermolecular interaction for all crystals, dominating the tight stacking and structural stability. The planar hydrogen bonds in TATB molecules result in significant anisotropy in the structure, which results in significant anisotropy in the elastic tensor, while both γ-CL-20 and HMX show relatively minor anisotropic features. The removal of the dispersion correction leads to a significant reduction of elastic constants (more than 65% ) for HMX, proving that the dispersion correction makes a significant contribution to the elastic tensor of crystals when there is no hydrogen bonds in energetic molecules. The relative size of the elastic constants can qualitatively reflect the relative level of molecular sensitivity. The theoretical and experimental values of the elastic constants of energetic molecule crystals are basically consistent, which is important for the understanding of the relationship between the structure and mechanical properties of energetic materials. [ABSTRACT FROM AUTHOR]

Copyright of China Rubber Industry is the property of Editorial Office of China Rubber Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The concentration and statistical numbers of counting standard microspheres used for cell counting of the Saccharomyces cerevisiae strain (ATCC9080) were selected for analyzing the effects of microsphere aggregation. The dispersion, concentration, and statistical numbers of microspheres in Tween 20 or Tween 80 suspension for S. cerevisiae counting were evaluated. In addition, we determined the linearity between standard microsphere counting and plate counting. Our study showed that the dispersion of microspheres in 0.08% Tween 20 or 0.06% Tween 80 suspension was suitable, with a dispersion index of 3.30. For counting 105, 106, and 107 cells/mL of S. cerevisiae, the total statistical numbers of standard microspheres should not be less than 2 000, 1 500, and 1 000, respectively. In addition, the total statistical numbers of cells should not be fewer than 200, 400, and 2 600. At 105 to 107 cells/mL of S. cerevisiae, the counting results by standard microspheres were consistent with those of the plate counting (R²=0.996 9), with 106 beads/mL of standard microsphere being the most suitable concentration. Our results indicated the standard microspheres could be effectively dispersed by Tween 20 or Tween 80. Hence, microbial cells in suspension can be accurately counted by using an appropriate concentration of dispersed standard microspheres. The suitable parameters of the standard microspheres for microbial counting were identified to provide the application conditions of standard microspheres in GB/T 39730-2020. [ABSTRACT FROM AUTHOR]

Platinum dispersion is an important factor affecting the activity of catalytic reforming catalyst. The platinum dispersion of reforming catalyst is generally measured by hydrogen-oxygen adsorption method. Due to high temperature and moisture atmosphere, the platinum on the catalyst will accumulate and the chlorine components wiil be lost, which leads to the deactivation of catalyst. After carbon burning of the deactivation catalyst, it is oxidized and chlorinated to supplement the chlorine, and disperse platinum crystal particles, and restore the catalyst activity. The oxychlorination stage conditions are key factors in restoring platinum dispersion. By adjusting the reaction severity, the carbon deposition is increased from 3. 0% ~ 3. 5% to over 4.0%. Increase the temperature at the inlet of the second charring stage from 480 °C to more than 490 °C, and the bed temperature of the oxychlorination stage is increased from 480 ~490 °C to more than 510 °C. The oxygen volume fraction at the outlet of the second charring stage is reduced from 0.35% to 0.30% to improve the air distribution in the oxychlorination stage, and the oxygen volume fraction in the oxychlorination stage is remained above 5.8%. According to the catalyst circulation rate, the chlorine injection increases from 2,000 µg/g to 2,600 µg/g. The molar ratio of water to chlorine is controlled to 5 - 6. The platinum dispersion of the reforming catalyst is increased from 70% to more than 85% . [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objectives]This study aimed to clarify the formation of protein corona by nanoplastics and urease, and its effects on nanoplastics and urease. [Methods]Different nanoplastics-urease suspensions were prepared by using positively charged, negatively charged and uncharged nanoplastics and urease with concentrations of 0.05,0.20 and 0.50 mg·mL-1 as test materials. According to the adsorption amount of urease and the changes in morphological characteristics of nanoplastics, the formation of protein corona was clarified. Through the analysis of roughness, hydrate particle size, zeta potential, urease conformation, activity and other indicators, the effect of protein corona formation on the characterization of nanoplastics and urease structure and activity under different conditions was determined. [Results]Differently charged nanoplastics adsorbed urease with all concentrations to form protein corona. With the increase of urease mass concentrations, the particle size and surface roughness of the protein corona increased; the protein corona formed by positively charged nanoplastics and urease showed the most significant difference from the original nanoplastics, and the urease activity was significantly inhibited. When the urease mass concentrations was 0.05 mg·mL-1,the formation of protein corona would lead to significant changes in urease conformation, which was characterized by a significant decrease in the content of β-folded structure and a significant increase in the content of irregular structure. [Conclusions]Three nanoplastics in our experiment would form protein corona with urease, reducing their dispersion and stability to varying degrees. The strength of the effect of protein corona on nanoplastics and urease was closely related to the chargeability and urease mass concentrations of nanoplastics. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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In order to study the aeroacoustic characteristics of the new distributed tail rotor, the method used for the calculation of distributed ducted tail rotor aerodynamic and acoustic is established based on the sliding mesh method and penetrable surface. The Reynolds-averaged Navier-Stokes is used as the govern equation. The second order Roe scheme is used for spatial dispersion. The implicit LU-SGS scheme is applied to the pseudo-time marching. The S-A turbulence model is selected. The FW-H equation is used to calculate the noise. By the established method, the aerodynamic and acoustic characteristics of traditional tail rotor and distributed ducted tail rotor are calculated. The results indicated that compared with the traditional tail rotor, for the typical radiation direction, namely the tip-path-plane, the noise amplitude of distributed ducted tail rotor is reduced by 5—6 dB under the same aerodynamics, and with the decrease of rotor speed, the noise amplitude is decreased further. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ethylene glycol-based carbon black slurry is prepared by ultra-fine dispersion method, and the influence of mass ratio of dispersant to carbon black, grinding time and rotation speed on carbon black particle size is clarified by single-factor variable method. Ethylene glycol-based carbon black slurry is prepared by orthogonal experiment optimization of carbon black dispersion process, and the morphological structure and dispersion status of carbon black in ethylene glycol solution are observed. The results show that when the mass ratio of dispersant to carbon black is 1:10, the grinding time is 180 min and the rotational speed is 3500 r/min, the dispersion effect of carbon black is the best, and the average particle size is 170. 89 nm. The centrifugal stability in ethylene glycol solution is more than 90%, the heat resistance stability is more than 90%, and it has excellent storage stability. [ABSTRACT FROM AUTHOR]

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A method based on fractal dimension to characterize the agglomeration behavior of nanoparticles was developed. By analyzing the transmission electron microscope images of nano-SiO2 particles, the distribution state of SiO2 distributed in silicone rubber was observed by frozen section. The relationship between fractal dimension and oil absorption value, surface hydroxyl number, mechanical properties and so on was explored. The results show that the larger of agglomeration of nanoparticles is, the greater the fractal dimension; through the calculation of the fractal dimension of ultrathin slices of nano-SiO2 reinforced silicone rubber, it can be known that the agglomeration of nanoparticles in polymers also presents the same trend, the larger the fractal dimension, the greater the degree of agglomeration; in addition, the fractal dimension increases, the oil absorption value of nano-SiO2 get smaller, surface hydroxyl groups becomes fewer, and the tensile strength, tear strength and hardness of the silicone rubber sheet increase. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Guangxi Normal University - Natural Science Edition is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Electroplating & Finishing is the property of Electroplating & Finishing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Wetland is an important part of the ecosystem, and the investigation of wetland pollutant migration under the combined effect of submerged vegetation and bed absorption boundary can provide a reference for wetland design and maintenance. The random displacement model based on the Lagrangian method is adopted to simulate the transport process of instantaneously released pollutants in wetlands with dense rigid submerged vegetation and bed absorption boundary by setting different vegetation densities and bed absorption probabilities for the pollutants. Results indicate that the increase of the bed absorption probability accelerates the average migration velocity of the pollutant particle cloud and weakens its longitudinal dispersion, while the increase of vegetation density inhibits the bed absorption, extending the stay and greatly dispersing the distribution of the pollutants in the wetland, thereby giving full play to the comprehensive purification function of the wetland. When the absorption probability exceeds 10%, the absorption boundary of the bed can be regarded as a completely absorptive boundary. Conseqently, the use of a substrate with high absorption probability in wetland design is unnecessary. [ABSTRACT FROM AUTHOR]

Focusing on the effects of active centers and supports of polycyclic aromatic hydrocarbons hydrogenation catalysts on saturated hydrogenation of polycyclic aromatic hydrocarbons, and introduces some typical saturated hydrogenation networks of polycyclic aromatic hydrocarbons・ The development of polycyclic aromatic hydrocarbon hydrogenation catalyst is prospected・ It is pointed out that the key to improve the performance of polycyclic aromatic hydrocarbon hydrogenation catalyst is to introduce a variety of supported components, improve the particle dispersion and stability of supported components, and appropriate pore size and structure. [ABSTRACT FROM AUTHOR]