Статті в журналах: "Lining plates"

1

Liang, Jun, Xian Quan Han, Bo Hu, and Yong Tan. "Canal Reach Deformation Monitoring Technology Based on Terrestrial LIDAR Scanning Technology." Advanced Materials Research 383-390 (November 2011): 4175–79. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.4175.

Повний текст джерела

Анотація:

Canal reach soil of the south to north water transfer project has a certain expansibility. Concrete lining plates is puring on the soil. After about half a year of water immersion test, a certain plastic deformation has happened on the lining plates because of the expansion in the soil. In order to monitoring the whole lining plates deformation pre and post water immersion test, point clouds is collected by Terrestrial LIDAR and total station. After constructing of triangular mesh and endowing the specific color, the two group of mesh can be overlapping displayed. Deformation area can be found easily by color distortion on superposition chart. And then deformation tendency is concluded.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Harada, Yasunori, Ken-ichiro Mori, and Seijiro Maki. "Lining of metal plates with foils using hot shot peening." Journal of Materials Processing Technology 80-81 (August 1998): 309–14. http://dx.doi.org/10.1016/s0924-0136(98)00114-9.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

You, Yiliang, Zheng Zhang, and Luoning Ma. "Cracking analysis of 316L stainless steel lining plates in alkaline environments." Engineering Failure Analysis 39 (April 2014): 34–40. http://dx.doi.org/10.1016/j.engfailanal.2014.01.006.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Si-Yong, Zhao, Lin Huai-Tao, Zeng Yao-Dong, Lu Jin-Cai, and Chang Zhe-Chuan. "The optimal mating of balls and lining plates in ball mills." Wear 178, no. 1-2 (November 1994): 79–84. http://dx.doi.org/10.1016/0043-1648(94)90131-7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Bembenek, Michał. "The Influence of the Use of Polymer Lining within the Roller Press Gravity Feeder on Briquette Quality." Polymers 12, no. 11 (October 27, 2020): 2489. http://dx.doi.org/10.3390/polym12112489.

Повний текст джерела

Анотація:

When considering the operation of roller presses for the consolidation of fine-grained materials, the main problems are disturbances in the proper flow of the material and its bridging in gravity feeders. This is especially true for small and medium capacity presses, where the hoppers for dosing the material are narrow. This article presents innovative laboratory tests of the impact of using a polymer plate lining in the gravity feeder of a roller press. Polymer materials Polyacetal C (POM C) and Ultra-High-Molecular-Weight Polyethylene (UHMW-PE) were used for the tests. The influence of the use of plates on the material flow and quality of briquettes was investigated in comparison with the case where such plates were not used. The research showed an improvement in the flow of fine-grained materials in the feeder and an increase of the briquette strength indexes, as compared to those cases when polymer linings were not used in the feeder.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Zhou, Heng, Xiaofan An, Peng Huang, Xuguang Chen, Shengjie Di, Xi Lu, and Longwei Yang. "Finite Element Analysis on Lining Structure of Diversion Tunnel in a Hydropower Station." E3S Web of Conferences 276 (2021): 02012. http://dx.doi.org/10.1051/e3sconf/202127602012.

Повний текст джерела

Анотація:

Aiming at the high internal and external water pressure tunnels built in unfavorable geological bodies, this study proposes a novel type of composite support structure in which steel plates are poured inside concrete linings. Compared with traditional structures, it has the advantages of higher tensile strength, better crack resistance, and impermeability. Taking the diversion tunnel of a hydropower station as an example, based on linear and non-linear finite element simulations, mechanical properties of the steelconcrete composite lining structure for a hydraulic tunnel in soft surrounding rocks are analyzed. On this basis, the concrete crack control under this supporting condition is verified. Research results can provide a reference for the selection of reasonable steel plate thicknesses and reinforcement types in design.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Aleksandrov, I. V., I. A. Bobukh, and N. N. Strel'nikov. "Reconstruction of Rolling-Mill Stands with the Use of Bimetallic Lining Plates." Metallurgist 47, no. 11/12 (November 2003): 506–9. http://dx.doi.org/10.1023/b:mell.0000019014.57442.93.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

YASHIRO, Kazuhide, Noriyuki OKANO, and Tsunetaka TSURU. "Repair Work for Tunnel Lining Using Basalt Plates and its Application Examples." Journal of the Japan Society of Engineering Geology 61, no. 6 (February 10, 2021): 321–25. http://dx.doi.org/10.5110/jjseg.61.321.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Hassan, Mahmood-ul, and Amna Bashir. "Effect of soft outer lining in pentafurcated duct." Canadian Journal of Physics 96, no. 2 (February 2018): 165–73. http://dx.doi.org/10.1139/cjp-2017-0045.

Повний текст джерела

Анотація:

This paper describes the diffraction of the lowest plane wave propagating out of the opening of a semi-infinite hard duct that is symmetrically placed inside an infinite soft duct. The whole system forms a pentafurcated waveguide whose solution is given by eigenfunction expansion. The same method has been used to validate the results of a trifurcated duct problem previously tackled by using the standard Wiener–Hopf technique. Some graphical results showing the influence of waveguide spacing on the reflection coefficient are presented. We compared our results with the related existing work. We observe that the accumulative value of reflection for current pentafurcated duct is 1375.1, which is the greatest among the related trifurcated and existing pentafurcated ducts. Hence the soft lining on outer plates gives better results to attenuate the unwanted noise. These problems have application in acoustics.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Li, Wang Lin, Ying Te Li, and Jian Ying Yu. "Application of New Concrete Materials in Channel Lining of the South-to-North Water Diversion Project." Advanced Materials Research 306-307 (August 2011): 942–45. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.942.

Повний текст джерела

Анотація:

Concrete lining is commonly used in large channel project to fixup soil slope and prevent channel seepage. Concrete lining is a type of thin plates structure which should have the high compression strength, crack resistance and durability. Two new high performance concrete (HPC) are used in lining project of south main channel of Yellow River-crossing project in east-route of the South-to-North Water Diversion Project. One is flyash HPC with manufactured-sand and the other is HPC with cementitious capillary crystalline waterproofing material (CCCW); meanwhile, the mix proportion of flyash HPC with manufactured-sand and HPC with CCCW are recommended. For flyash HPC with manufactured-sand, the recommendatory water-binder ratio is 0.4 and the recommendatory flyash content is 30%. For HPC with CCCW, the recommendatory water-binder ratio is 0.48 and the recommendatory CCCW content is 1.5%.With the wide application of new HPC, the compression strength, crack resistance and durability of lining concrete are improved, channel seepage discharge is reduced and a large amount of natural building materials are saved.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Chen, Hao, Hongpeng Lai, Yuliang Qiu, and Rui Chen. "Reinforcing Distressed Lining Structure of Highway Tunnel with Bonded Steel Plates: Case Study." Journal of Performance of Constructed Facilities 34, no. 1 (February 2020): 04019082. http://dx.doi.org/10.1061/(asce)cf.1943-5509.0001363.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Zhao, Huiling, Xian Liu, Yihai Bao, Yong Yuan, and Yun Bai. "Simplified nonlinear simulation of shield tunnel lining reinforced by epoxy bonded steel plates." Tunnelling and Underground Space Technology 51 (January 2016): 362–71. http://dx.doi.org/10.1016/j.tust.2015.10.004.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Colombo, Matteo, and Paolo Martinelli. "SDOF Models for RC and FRC Circular Plates under Blast Loads." Applied Mechanics and Materials 82 (July 2011): 440–45. http://dx.doi.org/10.4028/www.scientific.net/amm.82.440.

Повний текст джерела

Анотація:

This work presents simpliﬁed models, in the form of single degree of freedom (SDOF)elasto-plastic systems, for the dynamic analysis of traditional reinforced concrete (RC) and ﬁbre-reinforced concrete (FRC) circular plates under blast loads. Two cases have been examined inthis study: simply supported and resting on Winkler-type soil plates. Both cases intend toprovide a simpliﬁed tool for predicting the response respectively for specimens subjected toblast pressure wave inside shock-tube facilities and for slabs on ground under blast loads. Thesecond case also represents the loading conditions inside a new shock tube facility speciﬁcallyintended for the investigation of underground tunnel lining subjected to blast loads.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Mutafchiev, Y., and B. Georgiev. "Redescription of Desportesius brevicaudatus (Spirurida, Acuariidae) based on nematodes from Ixobrychus minutus (Aves, Ciconiiformes) from Bulgaria." Helminthologia 46, no. 2 (June 1, 2009): 90–96. http://dx.doi.org/10.2478/s11687-009-0018-7.

Повний текст джерела

Анотація:

AbstractDesportesius brevicaudatus (Dujardin, 1845) is redescribed on the basis of light-microscopy and SEM observations on specimens collected from the oesophagus and under the lining of the gizzard of Ixobrychus minutus (Ardeidae) from Bulgaria. New metrical data expand the known ranges of variation of the measurements of the body, tail, cordons, oesophagus and spicules. New information is provided on the variation of the shape of the deirids, the structure of the vagina, the complexity of the cordons, the pattern of the cuticular striation and the shape of the postdeirids. Cordons are described as consisting of a single row of serrate cuticular plates and a longitudinal cuticular ridge along the outer rims of the cuticular plates. The cuticular ridge is interpreted as homologous to the outer row of plates in the cordons of the genera Acuaria, Cheilospirura and Echinuria.

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Grinberg, V. Ya, N. I. Abramova, S. V. Zhebrunov, S. B. Chernavin, N. A. Kozlova, and A. V. Mulerova. "Tests of thermal insulation plates of the unpreheated lining of continuous casting machine tundishes." Refractories 32, no. 1-2 (January 1991): 98–99. http://dx.doi.org/10.1007/bf01295640.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Huang, Yuan Mao, and J. S. Shyr. "On Pressure Distributions of Drum Brakes." Journal of Mechanical Design 124, no. 1 (November 1, 1999): 115–20. http://dx.doi.org/10.1115/1.1427694.

Повний текст джерела

Анотація:

Based on the assumptions that there is perfect contact at the interface between the brake drum and the lining plates, the friction coefficient is constant, the thermal effect is neglected, and the brake drum is a rigid body, the pressure distributions of drum brakes were studied by using the boundary element method. The constant element is used in the two-dimensional model of the drum brake for simplicity and economy. The friction force versus the effective lift at the actuation edge and the location of the maximum pressure are compared and indicate a good correlation with existing data. The effects of the Young’s modulus of elasticity of the metal shoe, the arc lengths of the metal shoe and lining plate, the location, the thickness, the friction coefficient, the Young’s modulus of elasticity of the lining plate, and the angle of actuation force on the pressure distributions were then studied. By selecting proper values of these parameters, a drum brake can be designed to have a more uniform pressure distribution and a longer life.

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Motiwala, Momina Anis, Kamil Zafar, and Farhan Raza Khan. "Surgical and prosthodontics management of a perforating giant radicular cyst in anterior maxilla: a case report." Journal of the Pakistan Medical Association 72, no. 5 (May 10, 2022): 965–68. http://dx.doi.org/10.47391/jpma.2111.

Повний текст джерела

Анотація:

Abstract Radicular cyst is the most common type of odontogenic cyst associated with the apex of non-vital teeth. The lining of the radicular cyst usually arises from the epithelial rests of Malassez. These cyst usually persists even after the elimination of microbial load from the root canals. Surgical removal is deemed necessary for the management. For larger lesions extending to the facial or palatal cortical plates, additional regenerative procedures such as bone grafting along with collagen membrane are warranted. This case report describes the surgical and prosthetic management of a giant radicular cyst that was perforating the cortical plates in the anterior maxilla. Key words: cysts, radicular cyst; bone grafting, esthetic management, regeneration.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Pan, Hong Ke, Jiang Chun Hu, and Lin De Yang. "The Principle and Calculation Method of Carbon Fiber Reinforcement for Tunnels and Underground Structures." Applied Mechanics and Materials 94-96 (September 2011): 1247–51. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1247.

Повний текст джерела

Анотація:

There will emerge cracks or damage due to the action of rock pressure or its own shortcomings and low strength for the lining structure in tunnel or underground engineering, especially at the places of excessive bending moment and tensile stress because of bias pressure where concrete will be pull apart for the deficiency of strength even to cause leakage and durability insufficient. Conventional maintenance and reinforce methods are time-consuming and laborious, and the effect is also not ideal. It is simple, timesaving and having a significant and lasting effect to use carbon fiber reinforcement method. This paper studied structure’s failure mechanism and on the basis of that the principle of fiber-plate reinforcement from the angle of structural plastic development, then studied the improvement of structure’s mechanical character and the change of design calculation method for single section of underground structure with carbon fiber plates by using the research method of plane-strain. At the same time, the typical model of integral failure for single section was analyzed and the calculation method and formulae of bearing capacity and reinforcing steel bars were deduced, which remedied the shortfall in the design specification for concrete structure. In the end, by comparing the calculation results of structure with fiber plates and that with not fiber plates based on engineering example, the conclusion that structure’s bearing capacity and capability of resistance to deformation had obvious improvement was obtained.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Laberge, R. J. A., and J. Daniel McLaughlin. "Susceptibility of blue-winged teal, gadwall, and lesser scaup ducklings to experimental infection with Streptocara crassicauda." Canadian Journal of Zoology 69, no. 6 (June 1, 1991): 1512–15. http://dx.doi.org/10.1139/z91-211.

Повний текст джерела

Анотація:

Blue-winged teal, gadwall, and lesser scaup ducklings were exposed experimentally to identical doses of Streptocara crassicauda larvae. The heaviest infections developed in the teal. Gadwall were also highly susceptible and infection levels were generally similar to those in teal. Lesser scaup developed comparatively light infections. Lesions were restricted to the gizzard and occurred in the softer areas of the lining under the tendinous surfaces. Nematodes were generally confined to the lesions in scaup, but not in teal or gadwall. In these two species, they were also found elsewhere under the softer portions of the lining and, to a lesser extent, under the grinding plates. Teal and gadwall developed more and larger lesions because of the greater number of nematodes that established. When corrected for worm number, no difference in lesion size was found among the three species.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Zhai, Wuzhou, David Chapman, Dongming Zhang, and Hongwei Huang. "Experimental study on the effectiveness of strengthening over-deformed segmental tunnel lining by steel plates." Tunnelling and Underground Space Technology 104 (October 2020): 103530. http://dx.doi.org/10.1016/j.tust.2020.103530.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Sokur, Mykola, Volodymyr Biletskyi, Mykhailo Fyk, Oleksandr Fyk, and Igor Zaselskiy. "The study of the lining layer abrasing wear in the semi-autogenous grinding mill." E3S Web of Conferences 166 (2020): 03008. http://dx.doi.org/10.1051/e3sconf/202016603008.

Повний текст джерела

Анотація:

In this work complex investigations of the abrasing wear of lining of self-grinding mills (semiautogenous grinding mills) are carried out with the obtaining of mathematical models of wear-abrasing of elevators in terms of height, weight, volume and worn-out area. In particular, according to the location and nature of the abrasing wear processes, the liner-lifters mill self-grinding are identified in three typical groups. During 1 year, in the conditions of Ingulets GOK, the monitoring of the abrasing wear of selected groups of lifters of self-grinding mills was performed. On the basis of the experimental data calculationed in the Microsoft Office Excel program, a set of mathematical models of lifter abrasing wear was obtained in terms of height, weight, volume and worn-out area. The obtained dependencies are recommended for prediction of abrasing wear of lining and necessary frequency of replacement of inserts-lifters. In addition, the research of wear of lining made of cast iron RF–4, showed a significant reduction in their abrasing wear compared with steel 110G13L. Thus, it has been shown that the selection of liner-lifters materials can reduce the inter–repair period by 3 times or more (replacement of worn-out lifters). A comparison of the actual picture of the abrasing wear of elevators and Simulation Statics simulated result (using SolidWorks) stresses shows the convergence of the arrangement of the zones of maximum stresses and the maximum abrasing wear of the lining. Investigation of the influence of the stressed state of lining plates on the intensity of their abrasing wear – a promising direction for further research.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Sellami, Amira, Mohamed Kchaou, Reçai Kus, Jamal Fajoui, Riadh Elleuch, and Frédéric Jacquemin. "Impact of brass contents on thermal, friction and wear properties of brake linings composites." Mechanics & Industry 19, no. 1 (2018): 105. http://dx.doi.org/10.1051/meca/2016083.

Повний текст джерела

Анотація:

Automotive brake lining materials are composite materials of very complex formulation, highly heterogeneous. They help to carry out the desired combination of braking performance properties. Obviously, it requires that the friction material exhibits good complementarities and adequate combination of physico-chemical, thermal properties that act synergistically to provide the braking performance which should be adjusted by the addition of metallic fillers. The aim of this work is to study the role of one of the copper alloy particles, namely brass, on friction and wear. For this purpose, the experimental approach is based on the development of a simplified formulation. Three derived composites were developed in the laboratory by the addition 1.5 wt.%, 3 wt.% and 4.5 wt.% of brass. It is shown that addition of copper alloy particles increased thermal properties. Wear test results show that brass contributes to friction and wear mechanisms from a quantity introduced in the formulation equal to 4.5 wt.%. In fact, given its large size, it acts as primary plates serving as supports for the formation and expansion of plates necessary to enhance the stability of friction coefficient. Conversely, when adding an amount less than 4.5%, brass particles are generally all removed from the matrix implying a higher source flow of third-body wear.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

PENG, Shiguang. "Research on Strain Hardening Behavior of Light-weight Fe-24Mn-7Al-1C Cast Wear Resistant Steel for Lining Plates." Journal of Mechanical Engineering 52, no. 8 (2016): 125. http://dx.doi.org/10.3901/jme.2016.08.125.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

24

RAMÍREZ-PALMA, MARÍA TERESA, GENOVEVA HERNÁNDEZ-PADRÓN, JOSÉ MOJICA GÓMEZ, FERNANDO ROJAS-GONZÁLEZ, and VÍCTOR M. CASTAÑO. "NANOSTRUCTURED EPOXY-BASED ANTICORROSIVE COATINGS." Surface Review and Letters 27, no. 09 (February 3, 2020): 1950202. http://dx.doi.org/10.1142/s0218625x19502020.

Повний текст джерела

Анотація:

A functionalized epoxy resin (DGEBA) was synthesized from abietic acid, through the esterification and condensation reactions between the carboxyl groups of abietic acid and the basic functional groups of an epoxy resin. This method of synthesis increases the epoxy resin surface adhesion, as well as the chemical and thermal stability, for being used as a protective coating against corrosion of copper plates. Characterization analyses included FTIR and SEM of both raw and functionalized epoxy resin substrates performed. The corrosion performance of these coatings when applied onto Cu and stainless plates was tested in terms of: (i) immersion in a misty saline chamber, under accelerated corrosive conditions; (ii) Taber abrasion and (iii) hardness, adhesion and potentiodynamic polarization. The obtained results indicate the existence of a chemical bond between the epoxy ring and the carboxyl functional groups of abietic acid. This chemical bonding provided an increased adhesion as well as better chemical and thermal stabilities than those of the original resin. The corrosion resistance lining the functionalized epoxy resin films indicated that their anticorrosive efficiency was up to 30% higher than that of the functionalized resin.

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Jin, Xian Yu, Nan Guo Jin, and Xiang Lin Gu. "Damage Analysis of Waterproof Layer in Composite Tunnel Lining Based on Theory of Plate with Large Deflection." Key Engineering Materials 400-402 (October 2008): 245–50. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.245.

Повний текст джерела

Анотація:

: In order to analyze the cause of water leakage in highway tunnels, the damage property of waterproof board in composite tunnel lining with concrete matrix defects under hydraulic pressure was studied using Galerkin method for plates with large deflection. The deflection, stress and strain of waterproof boards were calculated in the conditions of rectangular and elliptic boundary due to concrete matrix defects. First strength theory was used to determine the critical load of the board and the critical depth of the defect. Investigation results showed that the maximum principal stress generates in the middle of longer side in the rectangular boundary condition and in the center in the elliptic boundary condition, the failure of the waterproof board under certain hydraulic pressure is related with the dimensions of concrete matrix defects and the dimension of the concrete matrix defect needs to be controlled in the design and construction of waterproof layer for tunnels.

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Горбунов, Михаил, Mikhail Gorbunov, Сергей Целуйко, Sergey Tseluyko, Сергей Зиновьев, Sergey Zinovev, Дмитрий Решодько, and Dmitriy Reshodko. "SCANNING CRYO-ELECTRON MICROSCOPY OF RAT LUNG AT COLD EXPOSURE." Bulletin physiology and pathology of respiration 1, no. 62 (December 15, 2016): 47–52. http://dx.doi.org/10.12737/23250.

Повний текст джерела

Анотація:

The aim of research is to investigate important structures in vivo of mucociliary conveyor of respiratory and airway parts of the lung of intact rats against general cooling by the method of scanning cryoelectron microscopy without fixation and dehydration. The rats (male) in an amount of 40 pieces were exposed to general cooling during 14 days for 3 hours per day at the temperature of -15ºC. Frozen in liquid nitrogen tracheal samples were placed on a freezing Pelzer table (-30ºC) of the consoles Deben Coolstage of scanning electron microscope Hitachi S-3400. The study was conducted at low vacuum (80Pa) using backscattered electrons detector (BSECOMP). It was found out that the epithelial lining of the trachea of rats is covered with a liquid layer consisting of viscous gel and aqueous phases masking ciliary epithelial cells. Mucous secretion of the bronchi is presented by single plates with mucus cellular elements. On the alveolar surface in the monolayer of surfactant there were discovered globular clusters of lattice surfactant. With total cooling on the surface of epithelial layer the amount of bronchial secretions increases, the structure of the mucociliary apparatus changes and tracheal mucosa surface becomes wavy and there are sometimes marked accumulations of mucus. In the epithelial lining there are identified areas with the predominance of ciliated epithelium goblet cells lacking microvilli. The secretory activity of goblet cells and type 2 alveolocytes of respiratory department is accompanied by an increased release of secretion causing a disturbance of mucociliary transport.

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Stolyarov, A. M., Ye A. Buneyeva, and M. V. Potapova. "Interrelation of CCM (Steel Billet Continuous Casting Machine) Tube Steel Casting Parameters and Hot-Rolled Plate Quality." Solid State Phenomena 316 (April 2021): 479–83. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.479.

Повний текст джерела

Анотація:

The quality of the hot-rolled plate up to 36 mm thick was estimated by the percentage of rolled products, sorted due to the presence of a surface defect "Non-metallic inclusions", and internal defects, detected by ultrasonic plate control. The analysis of the data on the total sorting of hot-rolled plates demonstrated that the amount of sorting differs significantly on the melting from which each series of tubular metal casting commenced, compared to all the other melting in the series. The sorting of the sheets rolled from the metal of the first in a series of melting proved to be 1.9 times higher than that of the metal of all other melts. The main reason (in 68% of cases) of sorting is the presence of non-metallic inclusions on the surface of the plates. The effect of sorting of hot-rolled plates on non-metallic inclusions of various parameters has been studied: the duration of the intermediate ladle-heating; the length of time from the end of the heating of the intermediate ladle, prior to the beginning of the casting; lining temperatures of the intermediate ladle before the beginning of casting; duration of filling the intermediate ladle; the filling rate of the intermediate ladle with metal; mass of metal in the intermediate ladle before the beginning of casting into the crystallizer; chemical composition of metal; overheating of the metal over the liquidus point at the beginning, middle and end of the casting. On the sorting of flat products for non-metallic inclusions, of all the parameters considered, a statistically significant effect is due only to the overheating of the metal above the liquidus point, which varies in the range from 19 to 35 ° C. In order to obtain an acceptable quality of both the surface of slabs and the surface of hot-rolled plates for non-metallic inclusions, the first in a series of melts recommends overheating of the metal in the intermediate ladle above the liquidus temperature of 30-35 ° C.

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Huang, Dan, and Wu Zhao. "The Resistance of SiC/Al Layered Composite to Ballistic Impacting." Materials Science Forum 704-705 (December 2011): 1011–16. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.1011.

Повний текст джерела

Анотація:

Ballistic impacting test has been conducted on laminated SiC/Al-Cu composite with three layers ceramic plates and metal multi-constrain, while the target sample was prepared through squeeze casting. The ballistic testing result showed that composite exhibited good structural integrity. Mass loss and length loss of projectile are 63.65% and 65.43% respectively, mainly resulted from abrasion of crushed ceramic particles and melting erosion itself. Multi-constrain of metal ensured to maximize the role of abrasion of crushed ceramic powder, in addition, the heat generated at instantaneous projectile-target contact led to partial corrosion on projectile. Subject to ballistic impacting, SiC ceramic was transgranularly fractured and crushed, metal lining was melt, deformed and destroyed, as well as the interface dissociation happened between ceramic and metal. These processes absorbed great kinetic energy of projectile, so as to stop the penetration of incident mass within the laminated structure. Layered composite failure was completed under synergistic effect of three fracture modes, including ceramic brittle fracture, interface debonding and metal fracture.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Shehi, Elona, Ked Fortuzi, Haider Ghazanfar, Shehriyar Mehershahi, and Bhavna Balar. "Apixaban Causing Hepatic Cystic Bleeding: A Rare but a Life-Threatening Complication." Case Reports in Gastroenterology 15, no. 3 (October 11, 2021): 904–9. http://dx.doi.org/10.1159/000519276.

Повний текст джерела

Анотація:

Cystic lesions of the liver are a heterogeneous group of disorders with varied etiology, prevalence, and clinical manifestations. Fibropolycystic liver disease encompasses a spectrum of related liver and biliary tract lesions caused by abnormal embryologic development of the ductal plates. These disorders include congenital hepatic fibrosis, biliary hamartomas, polycystic liver disease (PCLD), choledochal cysts, and Carolis disease. PCLD is arbitrarily defined as a liver that contains >20 cysts. Most liver cysts are incidentally found on imaging studies, and the majority of the patients with liver cysts are asymptomatic. Rarely, complications such as compression, infection, and bleeding within the cyst can occur. Under the effect of the increased pressure, the epithelial lining of the cyst undergoes necrosis and sloughing, causing injury of the fragile blood vessels, leading to intracystic bleeding. The bleeding within or from the cyst can be precipitated by anticoagulation. We present a patient with PCLD who developed intracystic bleeding after he was started on apixaban for the prevention of thromboembolism.

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Galinde, Jyotsna, Sunil Sidana, Radhika Ramaswami, and N. Srivalli. "Keratocystic Odontogenic Tumor." Journal of Contemporary Dentistry 3, no. 2 (2013): 87–91. http://dx.doi.org/10.5005/jp-journals-10031-1043.

Повний текст джерела

Анотація:

ABSTRACT In 2005, the World Health Organization renamed the lesion, previously known as an odontogenic keratocyst, as the keratocystic odontogenic tumor (KOT or KCOT). The term odontogenic keratocyst (OKC) was first used by Philipson in 1963 and its clinical and histologic features were confirmed by Browne in 1970 and 1971. In this case report, a young patient with a histology report as an orthokeratinized variety of KCOT and it was a primary lesion with amcystic lining that was thick may be due to chronic irritation because of which it could be removed in toto. Resection was not advocated as it causes morbidity, peripheral ostectomy could not be performed as the buccal and lingual cortical plates were already thinned out with areas of perforation. Thus, enucleation with Carnoy's solution was considered ideal for this case. Also, this patient has been on regular follow-up for around 8 months showed good healing with no signs of recurrence. How to cite this article Ramaswami R, Galinde J, Srivalli N, Sidana S. Keratocystic Odontogenic Tumor. J Contemp Dent 2013;3(2):87-91.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Braga, Bernardo M., and Roberto P. Tavares. "Mathematical model for prediction of hydrogen pick-up of liquid steel during filling of a continuous casting tundish." Metallurgical Research & Technology 115, no. 4 (2018): 409. http://dx.doi.org/10.1051/metal/2018009.

Повний текст джерела

Анотація:

Steels for several applications, such as steel cord for tires and heavy plates, present severe hydrogen restriction in their chemical composition. However, the hydrogen content of the liquid steel usually increases during tundish filling. This phenomenon, known as hydrogen pick-up, occurs due to direct steel contact with humidity present in the lining refractory, ladle sand and atmospheric air. The present work investigated by means of an analytical mathematical model the magnitude of hydrogen pick-up promoted by steel-air interaction. The relative importance of this mechanism was evaluated comparing the predictions with industrial data of hydrogen pick-up for a specific microalloyed steel grade. Results showed that air contamination can contribute to approximately 40% of the total hydrogen pick-up. An appropriate tundish inertization, which eliminates completely the air contamination, would be able to reduce approximately 1.5 ppm from the total hydrogen pick-up that happens during the beginning of the first heat of a sequence. As a consequence, it would be reduced more than 0.20 ppm of the total hydrogen pick-up in 36t of the steel cast.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Fletcher, K. I. G., J. Sim, N. Williams, N. Weber, F. C. Küpper, and P. van West. "Novel lineage of a green alga and Acremonium stroudii (Ascomycota) sp. nov. reported from Ascension Island." Journal of the Marine Biological Association of the United Kingdom 97, no. 4 (September 21, 2015): 669–79. http://dx.doi.org/10.1017/s0025315415001289.

Повний текст джерела

Анотація:

Environmental specimens lining seawater blowholes of Whale Point, Ascension Island in the South Atlantic Ocean were collected (August 2012) and investigated by morphological and molecular techniques. Reported here, Acremonium stroudii (Ascomycota) sp. nov., a filamentous conidia-forming fungus, was the only fungus isolated from the samples collected. Molecular analysis of the material also indicates the presence of a novel species of green algae being present, however, isolation of this alga has not been possible. Instead it appears that this specimen, which belongs to a novel lineage within the Ulvales, sister to the Dilabifilum species, encourages fungal growth in culture and has been shown to form a symbiotic relationship on low nutrition agar plates, supported by investigation through electron microscopy. As no holotype of this species could be isolated in an axenic culture it was not suitable at this point to try to define this alga, especially as no established genus could be attributed. We recommend trying to further sample areas of Ascension Island looking for other members of this green algal lineage, both investigating free-living green algae and those which are found as lichenized photobionts.

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Guseva, Rosa I., and Shu Mingoon. "PRODUCING THIN-WALLED LINING PLATES OF CARBON FIBER IN AIRCRAFT ENGINEERING: A CHANGE OF PROCESS PARAMETERS DURING MOLDING OF ITEMS MADE OF POLYMER COMPOSITE MATERIALS." Scholarly Notes of Komsomolsk-na-Amure State Technical University 1, no. 18 (June 30, 2014): 4–12. http://dx.doi.org/10.17084/2014.ii-1(18).1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Vlajkovic, Srdjan M., Peter R. Thorne, Jean Sévigny, Simon C. Robson, and Gary D. Housley. "NTPDase1 and NTPDase2 Immunolocalization in Mouse Cochlea: Implications for Regulation of P2 Receptor Signaling." Journal of Histochemistry & Cytochemistry 50, no. 11 (November 2002): 1435–41. http://dx.doi.org/10.1177/002215540205001102.

Повний текст джерела

Анотація:

Cellular, molecular, and physiological studies have demonstrated an important signaling role for ATP and related nucleotides acting via P2 receptors in the cochlea of the inner ear. Signal modulation is facilitated by ectonucleotidases, a heterologous family of surface-located enzymes involved in extracellular nucleotide hydrolysis. Our previous studies have implicated CD39/NTPDase1 and CD39L1/NTPDase2, members of the ectonucleoside triphosphate diphosphohydrolase (E-NTPDase) family, as major ATP-hydrolyzing enzymes in the tissues lining the cochlear endolymphatic and perilymphatic compartments. NTPDase1 hydrolyzes both nucleoside triphosphates and diphosphates. In contrast, NTPDase2 is a preferential nucleoside triphosphatase. This study characterizes expression of these E-NTPDases in the mouse cochlea by immunohistochemistry. NTPDase1 can be immunolocalized to the cochlear vasculature and neural tissues (primary auditory neurons in the spiral ganglion). In contrast, NTPDase2 immunolabeling was principally localized to synaptic regions of the sensory inner and outer hair cells, stereocilia and cuticular plates of the outer hair cells, supporting cells of the organ of Corti (Deiters’ cells and inner border cells), efferent nerve fibers located in the intraganglionic spiral bundle, and in the outer sulcus and root region of the spiral ligament. This differential expression of NTPDase1 and 2 in the cochlea suggests spatial regulation of P2 receptor signaling, potentially involving different nucleotide species and hydrolysis kinetics.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Bredberg, Anna, Johan Gobom, Ann-Charlotte Almstrand, Per Larsson, Kaj Blennow, Anna-Carin Olin, and Ekaterina Mirgorodskaya. "Exhaled Endogenous Particles Contain Lung Proteins." Clinical Chemistry 58, no. 2 (February 1, 2012): 431–40. http://dx.doi.org/10.1373/clinchem.2011.169235.

Повний текст джерела

Анотація:

Abstract BACKGROUND We recently developed a novel, noninvasive method for sampling nonvolatile material from the distal airways. The method is based on the collection of endogenous particles in exhaled air (PEx). The aim of this study was to characterize the protein composition of PEx and to verify that the origin of PEx is respiratory tract lining fluid (RTLF). METHOD Healthy individuals exhaled into the sampling device, which collected PEx onto a silicon plate inside a 3-stage impactor. After their extraction from the plates, PEx proteins were separated by SDS-PAGE and then analyzed by LC-MS. Proteins were identified by searching the International Protein Index human database with the Mascot search engine. RESULTS Analysis of the pooled samples identified 124 proteins. A comparison of the identified PEx proteins with published bronchoalveolar lavage (BAL) proteomic data showed a high degree of overlap, with 103 (83%) of the PEx proteins having previously been detected in BAL. The relative abundances of the proteins were estimated according to the Mascot exponentially modified protein abundance index protocol and were in agreement with the expected protein composition of RTLF. No amylase was detected, indicating the absence of saliva protein contamination with our sampling technique. CONCLUSIONS Our data strongly support that PEx originate from RTLF and reflect the composition of undiluted RTLF.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Power, J. H., I. R. Doyle, K. Davidson, and T. E. Nicholas. "Ultrastructural and protein analysis of surfactant in the Australian lungfish Neoceratodus forsteri: evidence for conservation of composition for 300 million years." Journal of Experimental Biology 202, no. 18 (September 15, 1999): 2543–50. http://dx.doi.org/10.1242/jeb.202.18.2543.

Повний текст джерела

Анотація:

The Australian lungfish Neoceratodus forsteri is the most primitive member of the lungfish family, with a surfactant lipid composition similar to the actinopterygiian fishes, which evolved 400 million years ago. We have analysed the proteins associated with surfactant isolated from lung lavage of this species, and used electron microscopy and immunohistochemistry to examine the surfactant structures and the subcellular localisation of these proteins. The epithelial lining of the gas-exchange region of the lungfish lung consists of one basic cell type, which has characteristics of both mammalian alveolar type I and type II cells and may be the common ancestor of both. It has long cytoplasmic plates containing microvilli, large osmiophilic bodies resembling mammalian lamellar bodies and a cytoplasm rich in metabolic organelles. Extracellular structures reminiscent of mammalian surfactant forms, but not including tubular myelin, were observed in the airspaces. Immunochemical analysis of the lungfish surfactant and lung tissue, using antibodies to human SP-A and SP-B, showed a similar staining pattern to human surfactant, indicating that SP-A- and SP-B-like proteins are present. Immunohistochemistry revealed that both SP-A and SP-B reactivity was present in the secretory cell osmiophilic bodies. In conclusion, our results suggest that, despite the great diversity in present day lung structures, a common cellular mechanism may have evolved to overcome fundamental problems associated with air-breathing.

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Olorunsola, R. A., D. Eruvbetine, O. M. Idowu, O. Oyekunle, and I. M. Ogunade. "Salmonella organism transmission in hatching broiler egggs." Nigerian Journal of Animal Production 41, no. 1 (January 19, 2021): 230–34. http://dx.doi.org/10.51791/njap.v41i1.2729.

Повний текст джерела

Анотація:

The vertical transmission of Salmonella organism in hatching broiler eggs were investigated in selected states in South-Western Nigeria. Hatching eggs were obtained from fifteen major hatcheries. five (hatchery A, B, C, D and E from each State [Lagos (LA), Oyo (OY) and Ogun (OG)]. A total of 300 hatchable eggs of 20 eggs from each hatchery were collected. Individual egg was broken and separated into Shell, albumin and yolk. The samples were incubated into buffer peptone water and incubated at 37°C for 24 hours. Typical colonies of salmonella grown on Xylose lysine deoxycholate agar were seen as lining black center and lightly transparent zone of reddish colour which were further cultured on nutrient agar plates for confirmatory test. The biochemical characterization was carried out using rapid kit for the identification of members of Enterobacteria family. The study revealed that Salmonella pullorum was isolated from the albumin in hatchery (OG-A) and hatchery (LA-A), Salmonella arizorae was also isolated in the Yolk from the hatchery (OG-C), Salmonella gallinarum was found in the albumin in Ogun hatchery (OG-A), however, Salmonella paratyphi A was isolated in the albumin in Oyo hatchery B (OY-B). It is evident from the study that salmonella organism reside in various fractions of the egg like albumin, shell and yolk.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Kubacka, Tomasz, and Chau Nguyen Dinh. "Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present." Acoustics 3, no. 2 (June 15, 2021): 425–41. http://dx.doi.org/10.3390/acoustics3020028.

Повний текст джерела

Анотація:

In order to determine the optimal parameters when using an ultrasonic probe to measure cavern geometry when a metal borehole pipe is present, an investigation was firstly carried out on influence of a vertical metal plates with a thickness from 1 mm to 15 mm immersed in water on transmitted and reflected ultrasonic waves. The results obtained will be used as an indicator for the measurement of underground geometry in which the ultrasonic probe is placed inside a metal pipe lining a borehole. These studies were performed both by experiment and computer simulation. The results show that the wavelength of the incident ultrasonic signals should be equal to half the thickness of the metal plate or an integer times smaller than this thickness. When the thickness of the barrier is unknown, an ultrasonic signal with linear frequency modulation (LFM) should be used. Due to the reverberation of the ultrasonic waves inside the pipe for caverns filled with water, the distance from the transducer to the cavern wall can be measured if it is longer than three times of the pipe diameter. Frequency analysis of both the reflected and the transmitted waves enables an optimal frequency of the incident ultrasonic wave to be selected, which can be used in the measurement of cavern geometry in conditions in which the ultrasonic probe is inside a metal pipe.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Pupan, Danuwat, Chakrit Suvanjumrat, and Watcharapong Chookaew. "Effect of Post-Curing Temperature and Mechanical Surface Treatment on Shear-Bond Strength of Asbestos-Free Brake Pad." Key Engineering Materials 751 (August 2017): 131–36. http://dx.doi.org/10.4028/www.scientific.net/kem.751.131.

Повний текст джерела

Анотація:

Brake pad is the combination of lining and metallic components, e.g. steel backing plate (disc brake) and aluminum brake shoe (drum brake). Shear bond strength plays a major role to provide the safety and/or drive performances. This work aimed to study the processing factors affected the bonding strength. The molding temperature couple with post-curing temperature was simultaneously analyzed in order to optimize the processing temperature. The shear bond strengths of metallic plates were continually investigated with regard to the effect of different surface treatments. The obtained results indicated that the mechanical strength was increased as the molding temperature raised in ranges of 160°C to 180°C. Conversely, the deterioration of adhesive strength was progressively presented with rising post curing temperature. In comparing different backing plate, aluminum showed the higher shear bond strength than that of steel plate. In fact, the weakened property of aluminum in nature would be easily destroyed by mechanical treatments. From the shear tested results, an increase of surface roughness was inversely changed the shear bond strength. On the other hand, the contact angle of water droplet affected directly to adhesive strength. It was suggested that an adding surface roughness, commonly used in automotive industry, was inappropriate criteria, whist geometrical surface should be taken into account for improving the shear bond strength. Moreover, the contact angle and mechanical interlocking were recommended to use as a criteria of brake pad shear strength.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Panin, Sergey V., Lyudmila A. Kornienko, Qitao Huang, Dmitry G. Buslovich, Svetlana A. Bochkareva, Vladislav O. Alexenko, Iliya L. Panov, and Filippo Berto. "Effect of Adhesion on Mechanical and Tribological Properties of Glass Fiber Composites, Based on Ultra-High Molecular Weight Polyethylene Powders with Various Initial Particle Sizes." Materials 13, no. 7 (April 1, 2020): 1602. http://dx.doi.org/10.3390/ma13071602.

Повний текст джерела

Анотація:

The aim of this study was to assess the effect of adhesion between the non-polar, ultra-high molecular weight polyethylene (UHMWPE) matrix and the glass fiber fillers of various lengths treated with the commercially available “KH-550” agent, on the mechanical and tribological properties of the UHMWPE-based composites. The motivation was to find the optimal compositions of the polymer composite, for the compression sintering manufacturing of lining plates for the protection of marine venders and construction vehicles, as well as transport equipment. It was shown that the initial powder size at equal molecular weight determined the distribution patterns of the glass fibers in the matrix, and, as a consequence, the mechanical and tribological properties of the composites. Based on the obtained experimental data and the results of the calculation by a developed computer algorithm, control parameters were determined to give practical recommendations (polymer powder size and glass fiber length), for the production of the UHMWPE-composites having specified mechanical and tribological characteristics. The “GUR4022 + 10% LGF” composite, loaded with the chopped 3 mm glass fibers treated with the “KH-550”, was recommended for severe operating conditions (high loads, including impact and abrasive wear). For mild operating conditions (including cases when the silane coupling agent could not be used), the “GUR2122 + 10% MGF” and “GUR2122 + 10% LGF” composites, based on the fine UHMWPE powder, were recommended. However, the cost and technological efficiency of the filler (flowability, dispersibility) and polymer powder processing should be taken into account, in addition to the specified mechanical and tribological properties.

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Garashchenko, A. N., A. I. Danilov, S. P. Antonov, S. V. Marchenkova, and V. V. Pavlov. "The thermal analysis of fire test results obtained for loaded cast iron tubing used to line subway tunnels, their rational fire protection and pre-set fire resistance." Pozharovzryvobezopasnost/Fire and Explosion Safety 31, no. 1 (March 16, 2022): 21–39. http://dx.doi.org/10.22227/0869-7493.2022.31.01.21-39.

Повний текст джерела

Анотація:

Introduction. The article addresses the fireproofing limit of the cast-iron tubing that lines subway tunnels. These structures have been fire tested neither in our country, nor abroad, and therefore, no fire test results have been analyzed, although this analysis is necessary to guarantee structural performance.Purpose and objective. The purpose of the study is to analyze the results of two fire experiments, including the testing of the cast iron tubing without fire proofing, and the testing of the tubing protected by a fireproof plate. The objective of the study is to choose and use a rational thermal analysis methodology.Methods. A standardized methodology was applied to test the fire resistance of loaded full-scale tubing specimens in a fire furnace, where thermocouple measurements of tested specimens were taken. The thermal analysis of these measurement results was conducted, using the methods and software for the numerical calculation of non-stationary temperature fields inside fireproof structures in one- and two-dimensional settings.Results. It has been established that the fire resistance limit of the 5.6-25-NU cast-iron tubing tested under constant static loading (150 kN) without any fire protection is 54 minutes, which corresponds to classification R 45, while the fire resistance limit of the same tubing, fireproofed by PROSASK fire panel plates, that are 25 mm thick, is, at least, 121 min (R 120). Calculations allow to prognosticate a change in the fire resistance, if account is taken of the difference between the test environment and the one of the tubing when in operation. The authors present the results of calculations for various fire protection options and show that the fire protection and fire resistance limits of the cast-iron tubing are high, if PROSASK fire plates are used. The authors also demonstrate the projectability of the fire resistance values, if the modes of exposure differ from the standard temperature mode.Conclusions. The thermal analysis of the results of two fire experiments, conducted to evaluate the fire resistance of the cast-iron tubing as the tunnel lining allows to obtain the information that is essential for the fire protection and pre-set fire resistance of critical subway structures as well as the further development of this area of experimental and theoretical research. The authors demonstrate the efficiency of thermal calculations as an instrument for the evaluation of fire protection parameters/fire resistance of tubing and the reduction in the number of costly fire tests.

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Vandevelde, Nathalie M., Paul M. Tulkens, and Françoise Van Bambeke. "Antibiotic Activity against Naive and Induced Streptococcus pneumoniae Biofilms in anIn VitroPharmacodynamic Model." Antimicrobial Agents and Chemotherapy 58, no. 3 (December 16, 2013): 1348–58. http://dx.doi.org/10.1128/aac.01858-13.

Повний текст джерела

Анотація:

ABSTRACTBiofilms play a role in the pathogenicity of pneumococcal infections. A pharmacodynamicin vitromodel of biofilm was developed that allows characterization of the activity of antibiotics against viability and biomass by using in parallel capsulated (ATCC 49619) and noncapsulated (R6) reference strains. Naive biofilms were obtained by incubating fresh planktonic cultures for 2 to 11 days in 96-well polystyrene plates. Induced biofilms were obtained using planktonic bacteria collected from the supernatant of 6-day-old naive biofilms. Biomass production was more rapid and intense in the induced model, but the levels were similar for both strains. Full concentration responses fitting sigmoidal regressions allowed calculation of maximal efficacies and relative potencies of drugs. All antibiotics tested (amoxicillin, clarithromycin, solithromycin, levofloxacin, and moxifloxacin) were more effective against young naive biofilms than against old or induced biofilms, except macrolides/ketolides, which were as effective at reducing viability in 2-day-old naive biofilms and in 11-day-old induced biofilms of R6. Macrolides/ketolides, however, were less potent than fluoroquinolones against R6 (approximately 5- to 20-fold-higher concentrations needed to reduction viability of 20%). However, at concentrations obtainable in epithelial lining fluid, the viabilities of mature or induced biofilms were reduced 15 to 45% (amoxicillin), 17 to 44% (macrolides/ketolides), and 12 to 64% (fluoroquinolones), and biomasses were reduced 5 to 45% (amoxicillin), 5 to 60% (macrolides/ketolides), and 10 to 76% (fluoroquinolones), with solithromycin and moxifloxacin being the most effective and the most potent agents (due to lower MICs) in their respective classes. This study allowed the ranking of antibiotics with respect to their potential effectiveness in biofilm-related infections, underlining the need to search for still more effective options.

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Athar, Mohammad Faraz, Md Rehan Sadique, Abdullah H. Alsabhan, and Shamshad Alam. "Ground Settlement Due to Tunneling in Cohesionless Soil." Applied Sciences 12, no. 7 (April 6, 2022): 3672. http://dx.doi.org/10.3390/app12073672.

Повний текст джерела

Анотація:

By the year 2035 it is estimated that Delhi and Mumbai will become two of the most populous cities around the globe. The massive population growth rate has led to the rise of land scarcity, urbanization, and industrialization and developments for rapid transit systems have made accordingly. Modern rapid transit systems comprise Metro rails and subways etc., and increase underground-construction activities. Nowadays, the tunnel-construction process heavily relies on massive machineries such as tunnelling-boring machines (TBM) and operations that produce great hindrance in the soil mass resulting in ground settlement at the surface. This study aimed to address these issues through small-scale laboratory experiments and further amplification to real-valued problems utilizing numerical methods. A cubic box of edge length 1 m made up of mild steel was generated to simulate a tunnelling operation and aluminum-made lining were used to simulate concrete tunnel linings. A finite element-based numerical investigation was done for a 2D elastoplastic numerical tunnel model with dimensions of 42 m × 42 m. Analysis was carried out on Optum G2 software. The analyzed variations in lining shapes of lining included circular, horseshoe, arch, elliptical, and square. Results showed that elliptical-shaped linings experienced the least ground settlement and these are recommended for places where surface settlement may cause major damage. It is also recommended that square-shaped linings should not be used in such situations due their higher settlement values.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Vikulin, V. V., M. Yu Rusin, and L. N. Rusanova. "Refractory Materials and Products Based on Natural Wollastonite for Making Ceramic Accessories to be Used in Aluminium Industry." Advances in Science and Technology 45 (October 2006): 2272–77. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2272.

Повний текст джерела

Анотація:

A new technology has been developed for making refractory products based on the naturally occurring wollastonite (calcium metasilicate) intended for the aluminum industry. The application of natural wollastonite requires no hydrothermal treatment in an autoclave, which considerably simplifies the manufacturing process and reduces its cost. A qualitative comparative analysis of natural wollastonite from different mineral deposits was made to choose an optimal modification with consideration for its availability. The articles were made by using steel-mold pressing, slip casting and vacuum forming methods. For the development of technology for manufacturing large-sized complex-shaped products the slip casting method was used and the slip basic composition was determined comprising 80% of wollastonite as a basic solid phase and 20% of plasticizers. The improvement in the thermal resistance of wollastonite-based ceramics is assured by applying special techniques, namely by addition of course-grained fillers. Thus, addition of about 15% of a course-grained fraction into the fine wollastonite-based slip improves the thermal resistance of ceramics and affords 2-3 times increase in their service life. The efficient way to increase the wollastonite-based ceramics thermal resistance is addition of inorganic fibers. With the use of an inorganic fiber, the materials have been produced with an apparent density ranging from 0.5 to 1.5 g/cm3 and an ultimate compressive strength of 0.5 to 10 MPa. The study has been made into ceramics structure comprising inorganic fibers. The developed materials are chemically inert to aluminum melt. They show no sticking, no mechanical erosion and they are thermal-resistant. With the above methods, the following products are being made on the basis of the naturally occurring wollastonite: spouts, lining plates, heat nozzles, stopper-rod devices, pipes and other articles that have been operating successfully in the aluminum industry of Russia.

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Migita, Makoto, Atsushi Fujita, Rei Ogawa, Takahiro Ueda, Yoshitaka Fukunaga, and Takashi Shimada. "Hematopoiesis in Bone Marrow Regenerated from Adipose-Derived Stromal Cells." Blood 110, no. 11 (November 16, 2007): 4108. http://dx.doi.org/10.1182/blood.v110.11.4108.4108.

Повний текст джерела

Анотація:

Abstract Background: Adipose-derived stromal cells (ASCs) are highly promising cells for tissue engineering because of their pluripotency and low donor morbidity. We have previously shown that ASCs differentiate into a variety of mesenchymal tissues including bone and bone marrow (BM) like architecture. Osteoblastic cells lining the endosteal surface are a key component of the hematopoietic niche to promote and regulate hematopoietic stem cells (HSCs). In the present study, we investigated whether ASCs derived BM can functionally support hematopoiesis. Methods: ASCs were isolated from the inguinal fat pads from C57/BL6 mice (Ly5.2) after collagenase treatment and were cultured for three passages in the culture plates. The attached cells were trypsinized and replated onto a hydoxyapatite (HA) scaffold with numerous small pores for 3 days. The scaffold with attached cells was implanted subcutaneously onto the back of C57/BL6 recipient mice. 4.0×105 Lineage negative (Lin-) Ly5.1 BM cells transduced with a lentiviral vector containing the luciferase (Luc) gene were intravenously administered into the recipient mice after lethal irradiation. After 8 weeks, the scaffolds including Luc+ cells were removed and re-transplanted to the lethally irradiated second recipient mice. Results: Excised HA scaffolds were totally covered with adipose tissues. Hematoxylin-eosin staining showed that microspores were filled with typical bone marrow architecture composed of adipocytes, vasculatures, stroma, and a variety of hematopoietic cells. In vivo bioluminescence imaging showed that Luc+ hematopoitic cells were detected in the scaffolds in the secondary transplanted mice for at least 6 months after transplantation. Bioluminescence signals were also detectable on the whole body including the head, extremities, chest, and abdomen after G-CSF injection. Conclusions: We demonstrated that BM could be regenerated by ASCs. The ASCs derived BM were capable of maintenance of hematopoietic progenitor cells in vivo. BM regeneration from non-BM cells raises new possibilities to treat various hematopoietic diseases.

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Wang, Zheng Jun, Jian Zhong Yang, Yi Yong Yang, Zheng You, and Fei Fan Chen. "Analysis the Thermal Field for the Liquid Floated Gyroscope and it's Simulation." Applied Mechanics and Materials 541-542 (March 2014): 1382–89. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.1382.

Повний текст джерела

Анотація:

In this paper, it is put forward a new kind of gyroscope and Theoretical analysis and simulation for it. it is based on the latest proposed a kind of MEMS gyroscope, the micro machine rotor of the liquid floated gyroscope in the thermal field has carried on the stress analysis and simulation. The magnetic field is a kind of drive, Gyroscope lumen is composed of stator and detecting electrode plates,it is filled with 2 # industrial white oil in the inner cavity body,2 # industrial white oil support this gyroscope of rotor . The measuring accuracy of the rotor is very high, and the rotor's drift stability is also greatly improved. But the rotor is governed by thermal field, it is still mentioned the main reason for the precision. For the generation of thermal field mainly comes from two parts: heat field and eddy heat. Comsol software is presented in this paper, the thermal field of the rotor were analyzed, and the current in the magnetic field to join 280 mA, 580 mA, 780 mA and 1800 mA, the temperature distribution for the magnetic field, the rotor's blow plate of temperature is less than the up plate of temperature; The rotor side wall is the highest temperature and its the lining is greater than the outer wall temperature; Around the rotor 2 # industrial white oil to join as the speed of 2500 rmp, 3500 rmp, 5500 rmp, 8000 rmp, because of the large flow rate, the eddy current is big, so the temperature increased. Two physical field coupling together to produce energy losses, affect the material performance, at the same time bring local vibration,this phenomenon results in the decrease of accuracy of measurement. Therefore, we need to change the rotor structure and materials to reduce the influence on measurement accuracy. At the same time for the next step, the stress analysis of rotor under the confined space for experiment platform test provide simulation data and the theoretical analysis.The sidewalls of the rotor machining into the radian of 0.05 mm.

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Shi, Lei Ming, Shun Li Feng, Zhi Hong Wang, Yi Ming Shao, and Xiao Chun Jian. "The Optimization Design and Research of CX20 Clutch Friction Plate." Advanced Materials Research 900 (February 2014): 781–86. http://dx.doi.org/10.4028/www.scientific.net/amr.900.781.

Повний текст джерела

Анотація:

With the help of the orthogonal experiment and the friction-wear mechanism by car as the research object of the clutch driven platen friction plate of Chongqing Changan CX20 auto power take-off installation, the optimization of clutch friction materials is studied.It was selected for the resin-base fiber materials of clutch driven platen to be commonly used in auto mechanical manufacture. It was analyzed for the abrasion mechanism of the clutch driven platen friction plate between the flywheel and the pressure plate,and discussed for the relationship of driven platen friction-plate heat recession-performance and the driven plate material at high temperature. The results show that the friction factor of the optimized driven platen lining materials do not change. In the process of the frequent friction heating to high temperature, the stability of the optimized driven platen lining materials is strong, the wear of those is reduced, and the optimized driven platen lining materials have good performance of high temperature-thermal recession.

Стилі APA, Harvard, Vancouver, ISO та ін.

48

MANOCHA, Sachin, Dushyant LAL, and Subramanian VENKATARAMAN. "ADMINISTRATION OF H2 BLOCKERS IN NSAID INDUCED GASTROPATHY IN RATS: effect on histopathological changes in gastric, hepatic and renal tissues." Arquivos de Gastroenterologia 53, no. 1 (March 2016): 36–43. http://dx.doi.org/10.1590/s0004-28032016000100008.

Повний текст джерела

Анотація:

ABSTRACT Background Nonsteroidal anti-inflammatory drugs induces gastric mucosal lesions because of its acidic properties. Ranitidine, an H2 receptor antagonist, has proved beneficial in patients with gastric ulcers. Objective The present study was performed to assess the effect of administering ranitidine in Nonsteroidal anti-inflammatory drugs (diclofenac, nimesulide) induced gastropathy, and their effect on the histopathology of stomach, kidney and liver. Methods Diclofenac, nimesulide, and ranitidine were administered in doses of 2, 4, and 6 mg/kg, p.o. once daily for 14 days, and their effect on gastric volume, acidity, mean ulcer number, and gastric pH. In addition, histopathological examination was also performed on sections of stomach, kidney and liver. Results Following the administration of diclofenac or nimesulide, all the gastric parameters were significantly altered as well as the histopathology of stomach, liver and kidney. In the control group, the renal sections showed normal glomeruli with no thickening of glomerular basement membrane, while in diclofenac alone, nimesulide alone, and ranitidine with nimesulide groups, the thickening of glomerular basement membrane was observed. These alterations were observed to be reversed in the ranitidine with diclofenac group. In the sections from the liver, the control group showed anastomosing plates and cords of cuboidal hepatocytes with round well stained nuclei and abundant cytoplasm. In the ranitidine with diclofenac, and ranitidine with nimesulide groups, mild dilatation of sinusoids is seen coupled with prominence of central vein. In the diclofenac alone and nimesulide alone groups, the proximal and distal convoluted tubules show mild focal tubular necrosis. In the gastric sections, the control group showed several folds forming villi, and the epithelial lining surface of the mucosa. In the ranitidine with diclofenac, and ranitidine with nimesulide groups, the duodenum showed scattered inflammatory cells composed predominantly of lymphocytes. In diclofenac alone and nimesulide alone group, the sections from the gastric areas showed partial necrosis and mild chronic inflammation respectively. Conclusion The study, therefore, has provided therapeutic rationale towards simultaneous administration of H2 receptor blocker ranitidine with diclofenac to be more beneficial as compared to ranitidine with nimesulide, to minimise the gastric intolerance of diclofenac in long term treatment of inflammatory conditions.

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Levshin, G. E. "WAYS TO IMPROVE INDUCTION CRUCIBLE FURNARES." Izvestiya. Ferrous Metallurgy 62, no. 2 (March 30, 2019): 97–102. http://dx.doi.org/10.17073/0368-0797-2019-2-97-102.

Повний текст джерела

Анотація:

Analysis of the main drawbacks caused by increased walls thickness of a lined crucible, presence of tubular copper single-layer inductor cooled from inside with standard water and absence or presence of core I-shaped magnetic circuits arranged around it forming a discrete ferromagnetic screen, was made for modern induction crucible furnaces. The first drawback is that a significant part of working electromagnetic flow Fwork is not used for effective heating, since it passes along the non-conductive lining of crucible, and not along the cage. Therefore, only 38.5 – 57.0 % of the flow Fwork is effectively used. The second drawback is increased cost and complexity of manufacturing of inductor coils from a special copper tube, which vibrate at twice the frequency, creating noise and weakening design of the furnace. Such inductors are characterized by reduced electrical efficiency and increased cost of preparation and cooling of conditioned water in systems that occupy an area several times greater than the area of furnace itself. The third drawback leads to the fact that a significant part of electromagnetic scattering flow of the Fconsupt does not participate in heating of charge and melt, but heats conductive elements of furnace, including surrounding magnetic inductor. Irrational use of total flow F, created by inductor, reduces its efficiency to almost 19 – 30 %, and the power factor cosφ to 0.03 – 0.10 and increases energy consumption. To reduce or eliminate disadvantages, three ways of improving these furnaces are proposed and justified: reducing thickness of crucible wall with its simultaneous hardening by installing a cylindrical shell between the crucible and the inductor, surrounding the inductor with an annular magnetic circuit and using a single or multiwire inductor instead of a tubular one. Combination of cylindrical shell, annular magnetic circuit, as well as the upper and lower plates of the furnace frame can form an annular closed cavity to accommodate wire inductor and circulating refrigerant, cooling the inductor and the magnetic circuit. As a result of the study, new design of induction crucible furnace with wire inductor and ring-type magnetic circuit developed at AltSTU is proposed, substantiated and patented. Based on experimental determination of effectiveness of the proposed structural elements, conclusion is made about the prospects for further research.

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Drela, Izydor, Jan Masalski, Monika Łukaczyńska, and Bogdan Szczygieł. "Properties of Rubber Lining after Sixteen Years Operation in Different Places of FGD Plant." Solid State Phenomena 227 (January 2015): 233–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.227.233.

Повний текст джерела

Анотація:

After over 16 years long service on the inner walls of a steel absorber and outlet channel in wet FGD system, the rubber lining was subjected to examinations. A series of impedance spectra for the pre-vulcanized soft rubber lining based on chlorobutyl rubber (CIIR) were recorded. Rubber lining samples taken from the absorber bottom, which had been in contact with the washer sump solution, exhibited properties similar to those of new rubber lining samples not exposed to the corrosive environment. Rubber lining samples taken from the absorber upper part and from the outlet channel showed significant damage, and so deterioration in their protective properties, in comparison with the new lining. Also the results of tensile strength and hardness tests carried out on rubber samples taken from various parts of the absorber and the outlet channel are presented.

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Lining plates"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями