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Copyright of Silicone Material is the property of Silicone Material 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.)

Epoxy resin/hollow glass beads-chopped basalt fiber (EP/HGM-CBF) composite foam materials with different fiber mass fractions of CBF were prepared. The effects of the solution corrosion environment on the compression properties of the specimens were investigated by immersing the composite foam material specimens in distilled water, seawater, and seawater with five times the concentration of the compounds, and the causes were analyzed by combining scanning electron microscope photographs and EDS energy spectrometry. The study shows that the moisture absorption rate of the specimen first increases and then decreases with the increase of fiber mass fraction, and the moisture absorption rate is the largest at 10% fiber mass fraction, and the moisture absorption rate is larger in distilled water than in seawater, and the increase of the particle concentration in the solution decreases the diffusion coefficient of the solution. In the solution-immersed corrosive environment, the compression properties of EP/HGM-CBF composite foams all increased with the increase of CBF mass fraction, and reached a maximum when the CBF mass fraction was 30%, and the greatest increase in compression strength and compression modulus was seawater with five times the concentration of the compounds, and the compression strength was increased by 28.4% compared with that of the specimens without CBF. The solution corrosive environment decreased the compressive mechanical properties of the specimens, and the damage forms of the composites were different in the distilled water and seawater environments; the distilled water environment was mainly physical damage such as the dissolution of resin leading to interfacial debonding, whereas the seawater environment was mainly chemical damage due to the dissolution of the interfacial structure by elemental Cl. [ABSTRACT FROM AUTHOR]

Ultra-deep wells with pressure coefficient less than 1.0 in Tarim oilfield are generally faced with lost circulation of mud in drilling the low-pressured carbonate reservoirs. These wells, with an average depth of over 6,000 m, have high risks of well control, thus, apart from drilling with no return when lost circulation is encountered, no other better means can be used to drill the wells to the designed depths, and in many cases, the wells can only be completed before drilling to the designed depths. To extend the lengths of the horizontal sections of the ultra-deep wells, researchers have developed high strength hollow micro glass beads for formulating water-based drilling fluids with density in a range of 0.93 g/cm³ to 1.07 g/cm³ . This paper describes in detail the operation process of the well Zhonggu 262-H4C in which lost circulation was encountered and a low density drilling fluid was then used to regain circulation and drilling was resumed directionally to the designed depth. In the field operation, the density of the drilling fluid was reduced to 0.98 g/cm³, and additional 373 m was drilled after the circulation, realizing the geological goal of one well to penetrate two fractured-vuggy bodies. This measure ensures that the well to be drilled to the designed depth after encountering lost circulation, setting a precedent of drilling an ultra-deep well with vertical depth over 6,000 m using low density drilling fluid formulated with hollow micro glass beads, and providing a technical reference for drilling low-pressured formations in old oilfields in China. [ABSTRACT FROM AUTHOR]

A lightweight and high-strength water-soluble core mold for composites was prepared by hot-air drying method using aqueous solution of polyvinylpyrrolidone as the adhesive and hollow glass beads, gypsum and graphite as the matrix materials. The effects of adhesive content and matrix material on the mechanical properties and dissolution rates of the water-soluble core mold were investigated. The effect of modification methods on the mechanical properties of water-soluble core molds was investigated, and the microscopic morphology of the modified water-soluble core mold was observed by scanning electron microscopy (SEM), and its modification mechanism was initially explored. The results shows that the density of water-soluble core mold is 0.46~0.58 g/cm³, and the high-temperature treatment and the compounding of glass beads with different scales of particle size are the effective means of modification. The flexural strength of the water-soluble core can reach 7.46 MPa, the compression strength reaches 7.45 MPa, and the dissolution rate is 1.11 g/min before the modification, while the flexural strength of the modified core mold can reach 13.21 MPa, the compression strength reaches 13.45 MPa, and the dissolution rate is 6.34 g/min. The comprehensive performance of the water-soluble core mold can meet the requirements of the composite molding process, and it provides a solution for the integrated molding of the hollow profiled composites. [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 Precious Metals / Guijinshu is the property of Precious Metals 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.)

The coupled level set and volume of fluid (CLSVOF) method was used to simulate the collision process of glass bead droplets with the same diameter, with the physical mechanism during the collision-separation behavior of glass bead droplets mainly studied. Based on the comparative verification with ntetradecane droplet collision experiments, the morphological changes and energy change patterns of glass bead droplets during the separation process were investigated numerically. The research shows that, the energy required for the collision and separation process of glass bead droplets mainly comes from the kinetic energy and surface energy of the droplets, and most of the kinetic energy would convert into viscous dissipation energy. Through the analysis of the changes of droplet energy and average total pressure, 4 important states of droplet collision and separation were obtained, including the radial stretching to limit, the radial contraction and axial stretching to balance, the axial stretching to limit, and the droplet bridge pinching separation. The velocity and pressure distributions of the 4 states were discussed. The results reveal that, the end pinchoff mechanism is a main cause for droplet collisional separation. The work provides a basis for enriching the theory about glass bead droplet collisions. [ABSTRACT FROM AUTHOR]

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics 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.)

Hollow glass beads (HGS) with different true densities and particle sizes were used to fill poly-addition silicone rubber to obtain low-density, low-thermal-conductivity silicone potting compound. The effects of different types of hollow glass microspheres on the density, viscosity and thermal conductivity of silicone potting adhesives were investigated. Under the condition of the same volume fraction of HGS, HGS with lower true density helps to obtain lower density silicone potting compound, but the particle size of HGS has little effect on the density of silicone potting compound. The viscosity of the silicone encapsulant also increases gradually with the increase of the particle size. For HGS with the same true density and different particle sizes, the smaller the particle size is, the viscosity of the encapsulant increases slightly. The influence of the thermal conductivity of the potting compound from the true density of HGS is not obvious, but with the same true density of HGS, the thermal conductivity of the silicone encapsulant filled with HGS with a large particle size relatively small. [ABSTRACT FROM AUTHOR]

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.)

Sand media filters are often among the common filter modes in micro-irrigation system due to its excellent fouling capacity. The sand filter intercepts impurity particles mainly through the filter layer pores. The pore structure of filter layers directly affects the effect of particle deposition and transport during filtration .The objective of this work was to to master the internal pore structure characteristics of sand filter layers composed of different granular filter media. Taking ordinary Quartz Sand(QS1), Sea Sand(SS2), ASM Modified Glass(MG3) and Glass Beads(GB4) with selected grain size1.0~1.18 mm as research objective, this study employs the advanced CT scanning technique to construct the three-dimensional(3D) structure of four filter layers. In combination with image analysis software VGStudio MAX, Image J, et al, the pore structure parameters such as porosity, pore size distribution, pore roundness value and flatness ratio of four filter layers were obtained by processing different filter layer CT slices. In order to investigate the complexity of different layer pore structure, the box-counting fractal dimensions of pore structures were calculated with fractal theory. The research results showed that the apparent porosity range of the four filter layers were 39.7%-44.6% (QS1), 38.5%-42.3%(SS2), 40.7%-45.6%(MG3), 34.8%-38.7%(GB4) and the volume porosities were 42.2%, 41.2%, 44.1%, 36.6% respectively. The pore size intervals were 75-960, 80-760, 70-1 050, 85-930 μm and the difference was not significant. The calculated pore roundness value ranges were 1.59-1.78, 1.35-1.54, 1.65-2.03, 1.20-1.36, the pore flatness ranges were 2.62-2.75, 2.05-2.20, 3.04-3.21, 1.94-2.04, the fractal dimensions Db of the four filter layers were 1.621, 1.566, 1.661 and 1.446, respectively. This study quantitatively characterized the pore structure characteristics of the filter layer, and obtained the differences of meso-pore structure of different granular filter media. The apparent porosities of the top filter layers were more higher than that of the bottom layers along the depth of the filter. The pore size distribution law was that small pores (<75 μm) accounted for the majority for all the four granular media and the pore shapes were mainly narrow and long type. With the media particle angularity increase, the distribution of the apparent porosity was more dispersed and the volume porosity was higher, the proportion of macro-pores increased accordingly and the maximum value reached 17.24% for MG3. The tendency of pore shape parameters deviation from sphericity was more obvious. The fractal box-counting dimension, which represented the complexity of pore structure, increased with the media angularity accordingly, and fractal dimension was negatively correlated with apparent porosity. The quantitative analysis of filter layers pore structure can overcome the shortage of traditional model experiment and provide a foundation for the subsequent study of particle deposition and migration in the filter layers. [ABSTRACT FROM AUTHOR]

Copyright of Advanced Engineering Science / Gongcheng Kexue Yu Jishu is the property of Advanced Engineering Science 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 Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic 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 Forensic Medicine / Fayixue Zazhi is the property of Journal of Forensic Medicine 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 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 Journal of Guangdong University of Technology is the property of Journal of Guangdong 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.)

The mixing and separating process of different-sized particles in a self-designed rotating drum were explored, where the glass beads were taken as particles. The power consumption of rotating drum under different operating parameters were measured. The results show that the particle separation is more evident when the drum is operated at high fill level, where the small particles surrounded by large particles are mostly observed. When the filling rate is low, it is unobvious for the particle separation of the similar size particles at different rotating speeds. The larger difference of the particle size, the more particle separation occurs. With the increasing rotational speed and fill level, the power consumption increases, while the power consumption is relatively less sensitive to the particle size ratio. [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.)

BACKGROUND: Increasing attention has been paid to vascular components of the adipose-derived matrix and adipose-derived stem cells in tissue engineering. Existing methods for separating the vascular components of the adipose-derived matrix mainly include enzymatic and bolus injection, both of which have fatal disadvantages. OBJECTIVE: To search for a method for preparing adipose-derived stromal vascular fractions with high efficiency, safety, and simplicity. METHODS: The group without any treatment was used as the negative control, and the enzymatic hydrolysis method served as the positive control. The enzymatic hydrolysis method, traditional bolus method, modified bolus method, glass beads method and built-in ultrasonic waves method were compared through cell volume, survival rate, cell fragments, cell viability, increment rate and detection of microbial infection. The enzymatic hydrolysis method and the common bolus injection method were commonly used in the separation of vascular component cells of the fat source matrix; the improved bolus method was a method obtained by improving on the basis of the ordinary bolus method; the glass bead method was to use the glass bead to oscillate. The shear force generated was obtained by adding glass beads to the fat granules and shaking at 2 500 r/min for 9 minutes to prepare stromal vascular fraction cells. Using the built-in ultrasonic method, adipose tissue was treated at 25 W for 36 seconds to obtain stromal vascular fraction cells through a cavitation effect. RESULTS AND CONCLUSION: (1) The size of stromal vascular fraction cells isolated by five methods showed no significant difference (P > 0.05). (2)The cell viability was lowest in the negative control group, and highest in the enzymatic hydrolysis group. The cell viability in the enzymatic hydrolysis, glass bead, and built-in ultrasonic wave groups was significantly higher than that in the modified and traditional bolus groups (P < 0.05). (3) The cell survival rate and cell proliferation rate in the enzymatic hydrolysis, glass bead, and built-in ultrasonic wave groups were significantly higher than those in the modified and traditional bolus groups (P < 0.05). (4) The cell fragmentation rate and cell apoptosis rate in the enzymatic hydrolysis, glass bead, and built-in ultrasonic wave groups were significantly lower than those in the modified and traditional bolus groups (P < 0.05). (5) These results indicate that the built-in ultrasonic method and the glass bead method are better in enriching vascular components of the adipose-derived matrix. But glass bead method adds exogenous products, so it increases the risk of pollution. Built-in ultrasonic method inserts the ultrasound probe into the adipose tissue, but as long as the ultrasound probe is thoroughly sterilized, the risk of contamination is minimized. In general, the built-in ultrasonic method and the glass bead method are superior to modified and traditional bolus methods. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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 Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu 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 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.)

The compressive properties and energy absorption properties of polypropylene(PP) composites filled with hollow glass beads(HGB) and powdered nitrile butadiene rubber(PNBR) respectively were studied by uniaxial compression tests. The energy absorption capacity of the studied materials was verified by impact toughness based on pendulum impact tests. Scanning electron microscopy was used to observe the microstructure of the fracture surfaces. It is found that HGB increases the stiffness but lowers the ductility of polypropylene,while PNBR is on the contrary. The stress response degree of PNBR/PP is the lowest as absorbing the same energy. The design stress of HGB/PP should be higher than that of PNBR/PP according to energy-absorption efficiency. The maximum value in the ideal energy-absorption efficiency curve occurs at the yield stage. Impact test results show that HGB and PNBR can improve the energy-absorption capability of polypropylene.

The retro-reflection problem of reflective fabrics containing glass beads is studied. When the refractive index of glass bead is lower, the spacer layer is suggested to be added between the glass beads and reflective layer, the reflex action of exposed retro-reflective fabric with spacer layer and enclosed retro-reflective fabric with spacer layer is analyzed. The results show that when the refraction of space layer is lower than the refraction of glass bead, the retro-reflection can be improved, and the greater the difference, the smaller the deflection angle, the better the retro-reflection performance. [ABSTRACT FROM AUTHOR]