The Grinding of Workpieces Exhibiting High Adhesion. Part 1: Mechanisms

1981 ◽  
Vol 103 (2) ◽  
pp. 144-155 ◽  
Author(s):  
S. Yossifon ◽  
C. Rubenstein
Keyword(s):  
Stainless Steel ◽  
Mild Steel ◽  
Large Scale ◽  
Argon Atmosphere ◽  
Grinding Wheel ◽  
Workpiece Material ◽  
Degree Of Protection ◽  
The Third ◽  
High Adhesion ◽  
First Results

Three distinct grinding mechanisms have been found to occur when 304 L stainless steel is ground by alumina wheels. The first results in the grits becoming worn by attritious wear and occurs when temperatures in the grinding zone are relatively high, the second occurs at lower grinding temperatures and results in isolated, tiny areas of workpiece material adhering to grits while the third becomes manifest at relatively low grinding temperatures and results in areas of the wheel, large in comparison to the size of a grit, being covered by adherent workpiece material. Previous proposals advanced to explain metal build-up on the grinding wheel are shown to be inadequate and the phenomenon of large-scale metal transfer to the grinding wheel is shown to be related to the ductility of the workpiece along with the degree of protection conferred by the oxide of the workpiece material. This explanation is confirmed by grinding experiments performed on a series of oxide-resistant workpieces ground in air and, in particular, by the grinding of mild steel in an argon atmosphere under which conditions large-scale transfer of workpiece material to the wheel occurred.

The Grinding of Workpiece Materials Exhibiting High Adhesion. Part 2: Forces

1981 ◽  
Vol 103 (2) ◽  
pp. 156-164 ◽  
Author(s):  
S. Yossifon ◽  
C. Rubenstein
Keyword(s):  
Surface Area ◽  
Large Scale ◽  
Metal Contact ◽  
Wheel Surface ◽  
Workpiece Material ◽  
Large Measure ◽  
Scale Adhesion ◽  
High Adhesion ◽  
Metal Metal ◽  
Force Components

Equations expressing the dependence of the force components on grinding parameters and on the fraction of the wheel surface area over which workpiece material adheres during the grinding of workpiece materials which exhibit high adhesion are derived. These are shown to express the experimentally observed relations between the force components for each of the three grinding mechanisms which occur when this class of workpiece is ground. When large scale adhesion of workpiece material to the wheel surface occurs and more than five percent of the wheel surface is occupied by transferred material, the force components arise in large measure as a result of the forces generated through this metal/metal contact.

Fabrication of Superhydrophobic Ni-SiO2 Nanocomposite Coating with Excellent Corrosion Resistance on Mild Steel

2016 ◽  
Vol 719 ◽  
pp. 14-19 ◽  
Author(s):  
Teng Fei Xiang ◽  
Shi Bing Ding ◽  
Cheng Li ◽  
Shun Li Zheng ◽  
Man Xin Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Large Scale ◽  
Steel Substrate ◽  
Corrosion Current ◽  
Nanocomposite Coating ◽  
Superhydrophobic Surfaces ◽  
Sliding Angle ◽  
High Adhesion ◽  
Potential Possibility

Superhydrophobic surfaces were fabricated on mild steel substrate by electrochemical deposition technique. The morphology of superhydrophobic coating shows a hierarchical structure, the contact angle of water on which is up to 160.1° and the sliding angle is about 1°. The corrosion resistance of as-prepared samples was measured by potentiodynamic polarization curves. The results show that the sample with superhydrophobicity provided better protection against corrosion. The corrosion potential of the sample was found a remarkable drift positively and the corrosion current density decreased sharply compared with which show high adhesion. This route may offer a potential possibility to fabricate superhydrophobic surfaces in large scale in industry and easy to generalize it to other metal materials.

Arthrodesis of the Distal Two Tarsal Joints in the Horse Using Perforated Stainless Steel Cylinders and Cancellous Bone Graft

1991 ◽  
Vol 4 (01) ◽  
pp. 21-27 ◽  
Author(s):  
R. M. Archer ◽  
R. K. Schneider
Keyword(s):  
Stainless Steel ◽  
Bone Graft ◽  
Cancellous Bone ◽  
Cancellous Bone Graft ◽  
The Third ◽  
Partial Fusion

SummaryTwo perforated stainless steel cylinders and autogenous cancellous bone were implanted into each of the distal intertarsal and tarsometatarsal joints of seven horses. In two control horses holes were drilled into each joint and autogenous cancellous bone was implanted without stainless steel cylinders. Horses which had cylinders implanted in the distal tarsal joints exhibited less lameness and were more comfortable following surgery than were the control horses. Fracture of the third tarsal, central tarsal, or third metatarsal occurred in five of the seven horses implanted with stainless steel cylinders within 45 days of surgery. Two implanted horses and two control horses were observed for five months after surgery. Partial fusion of the distal tarsal joints occurred in all four horses. Control horses were more lame than the implanted horses and developed a large bony exostosis over the medial distal tarsus.

Materials for the history of the gospel-Baptist movement in Ukraine

1996 ◽  
pp. 4-15
Author(s):  
S. Golovaschenko ◽  
Petro Kosuha
Keyword(s):  
Large Scale ◽  
Religious Studies ◽  
Theological Seminary ◽  
National Academy Of Sciences ◽  
Evangelical Christians ◽  
Evangelical Christian ◽  
First Results ◽  
History Of ◽  
Fruitful Cooperation ◽  
Academy Of Sciences

The report is based on the first results of the study "The History of the Evangelical Christians-Baptists in Ukraine", carried out in 1994-1996 by the joint efforts of the Department of Religious Studies at the Institute of Philosophy of the National Academy of Sciences of Ukraine and the Odessa Theological Seminary of Evangelical Christian Baptists. A large-scale description and research of archival sources on the history of evangelical movements in our country gave the first experience of fruitful cooperation between secular and church researchers.

Pèlerinages barrésiens

2013 ◽  
pp. 116-123
Author(s):  
Claire Bompaire-Evesque
Keyword(s):  
Large Scale ◽  
The Self ◽  
Joan Of Arc ◽  
The Third ◽  
National Importance ◽  
The Earth ◽  
Third Stage ◽  
The Dead

This article is a inquiry about how Barrès (1862-1923) handles the religious rite of pilgrimage. Barrès stages in his writings three successive forms of pilgrimage, revealing what is sacred to him at different times. The pilgrimage to a museum or to the birthplace of an artist is typical for the egotism and the humanism of the young Barrès, expressed in the Cult of the Self (1888-1891). After his conversion to nationalism, Barrès tries to unite the sons of France and to instill in them a solemn reverence for “the earth and the dead” ; for that purpose he encourages in French Amities (1903) pilgrimages to historical places of national importance (battlefields; birthplace of Joan of Arc), building what Nora later called the Realms of Memory. The third stage of Barrès’ intellectual evolution is exemplified by The Sacred Hill (1913). In this book the writer celebrates the places where “the Spirit blows”, and proves open to a large scale of spiritual forces, reaching back to paganism and forward to integrative syncretism, which aims at unifying “the entire realm of the sacred”.

Sustainable Production of Honeydew and Muskmelon in Western Mexico

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 495d-495
Author(s):  
J. Farias-Larios ◽  
A. Michel-Rosales
Keyword(s):  
Large Scale ◽  
Management Practices ◽  
Glomus Intraradices ◽  
Cultural Practices ◽  
Bare Soil ◽  
Western Mexico ◽  
First Results ◽  
Legume Cover Crop ◽  
Banana Leaves ◽  
Research Show

In Western Mexico, melon production depends on high-input systems to maximize yield and product quality. Tillage, plasticulture, fumigation with methyl bromide, and fertigation, are the principal management practices in these systems. However, at present several problems has been found: pests as sweetpotato whitefly (Bemisia tabaci Gennadius), aphids (Myzus and Aphis), leafminer (Liryomiza sativae); diseases as Fusarium, Verticilium, and Pseudoperenospora, and weeds demand high pesticide utilization and labor. There is a growing demand for alternative cultural practices, with an emphasis on reducing off-farm input labor and chemicals. Our research is based on use of organic mulches, such as: rice straw, mature maize leaves, banana leaves, sugarcane bagasse, coconut leaves, and living mulches with annual legume cover crop in melons with crop rotation, such as: Canavalia, Stilozobium, Crotalaria, and Clitoria species. Also, inoculations with mycorrhizal arbuscular fungi for honeydew and cantaloupe melon seedlings production are been assayed in greenhouse conditions for a transplant system. The use of life barriers with sorghum, marigold, and other aromatic native plants in conjunction with a colored yellow systems traps for monitoring pests is being studied as well. While that the pest control is based in commercial formulations of Beauveria bassiana for biological control. The first results of this research show that the Glomus intraradices, G. fasciculatum, G. etunicatum, and G. mosseae reached 38.5%, 33.5%, 27.0%, and 31.0% of root infection levels, respectively. Honeydew melons production with rice and corn straw mulches shows an beneficial effect with 113.30 and 111.20 kg/plot of 10 m2 compared with bare soil with 100.20 kg. The proposed system likely also lowers production cost and is applicable to small- and large-scale melon production.

Use of lime for the upgrading of existing wastewater treatment systems

1994 ◽  
Vol 29 (12) ◽  
pp. 279-282 ◽  
Author(s):  
C. Güldner ◽  
W. Hegemann ◽  
N. Peschen ◽  
K. Sölter
Keyword(s):  
Large Scale ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Chemical Precipitation ◽  
Fatty Acid Production ◽  
German States ◽  
Lime Solution ◽  
First Results ◽  
Pre Treatment

The integration of the chemical precipitation unit which would inject a lime solution into a series of mechanical-biological processes, including nitrification/denitrification, and the sludge treatment are the subject of this project. The essential target is the large-scale reconstruction of a mechanical-biological sewage treatment plant with insufficient cleaning performance in the new German states and the adjustment of the precipitation stage to the unsteady inflow of sewage. First results indicate that the pre-treatment performance could be improved by ≅ 20% and the discharge of concentrations of COD, BOD, N and P could be reduced and homogenized. In addition, experiments on hydrolysis and acidifiability of the pre-treatment sludge have been carried out on a laboratory level with the object of making sources of carbon readily available for denitrification. In the course of the experiment, inhibition of fatty acid production by calcareous primary sludge could not be detected. The characteristics of the sludge, such as draining and thickening were considerably improved by the adding of lime.

Quasar host galaxies and environments in the GAMA survey

2019 ◽  
Vol 15 (S356) ◽  
pp. 170-170
Author(s):  
Jari Kotilainen
Keyword(s):  
Galaxy Evolution ◽  
Large Scale ◽  
Group Membership ◽  
Host Galaxy ◽  
Host Galaxies ◽  
Cluster Group ◽  
First Results ◽  
Triggering Mechanisms ◽  
Mass Assembly

AbstractWe present first results from our study of the host galaxies and environments of quasars in Galaxy And Mass Assembly (GAMA), a multiwavelength photometric and spectroscopic survey for ∼300,000 galaxies over ∼300 deg2, to a limiting magnitude of r ∼ 20 mag. We use a GAIA-selected sample of ∼350 quasars at z < 0.3 in GAMA. For all the quasars, we determine all surrounding GAMA galaxies and measure their star formation (SF) rate and SF history, and the host galaxy morphology and group membership of the quasars. As a comparison sample of inactive galaxies, we use 1000 subsets of galaxies in GAMA, matched in redshift and galaxy stellar mass to the quasars. We find that quasar activity does not depend on the large-scale environment (cluster/group/void), although quasars tend to prefer satellite location in their environment. Compared to inactive galaxies, quasars are preferentially hosted in bulge-dominated galaxies and have higher SF rates, both overall and averaged over the last 10 and 100 Myr. Quasars also have shorter median SF timescales, shorter median time since the last SF burst, and higher metallicity than inactive galaxies. We discuss these results in terms of triggering mechanisms of the quasar activity and the role of quasars in galaxy evolution.

scholarly journals Preparation and Properties of Electrospun Phenylethynyl—Terminated Polyimide Nano-Fibrous Membranes with Potential Applications as Solvent-Free and High-Temperature Resistant Adhesives for Harsh Environments

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1525
Author(s):  
Hao-ran Qi ◽  
Deng-xiong Shen ◽  
Yan-jiang Jia ◽  
Yuan-cheng An ◽  
Hao Wu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Elevated Temperatures ◽  
Solvent Free ◽  
High Tech ◽  
Molecular Weights ◽  
Lap Shear ◽  
High Adhesion ◽  
Potential Applications ◽  
Fibrous Membranes

High-temperature-resistant polymeric adhesives with high servicing temperatures and high adhesion strengths are highly desired in aerospace, aviation, microelectronic and other high-tech areas. The currently used high-temperature resistant polymeric adhesives, such as polyamic acid (PAA), are usually made from the high contents of solvents in the composition, which might cause adhesion failure due to the undesirable voids caused by the evaporation of the solvents. In the current work, electrospun preimidized polyimide (PI) nano-fibrous membranes (NFMs) were proposed to be used as solvent-free or solvent-less adhesives for stainless steel adhesion. In order to enhance the adhesion reliability of the PI NFMs, thermally crosslinkable phenylethynyl end-cappers were incorporated into the PIs derived from 3,3’,4,4’-oxydiphthalic anhydride (ODPA) and 3,3-bis[4-(4-aminophenoxy)phenyl]phthalide (BAPPT). The derived phenylethynyl-terminated PETI-10K and PETI-20K with the controlled molecular weights of 10,000 g mol−1 and 20,000 g mol−1, respectively, showed good solubility in polar aprotic solvents, such as N-methyl-2-pyrrolidinone (NMP) and N,N-dimethylacetamide (DMAc). The PI NFMs were successfully fabricated by electrospinning with the PETI/DMAc solutions. The ultrafine PETI NFMs showed the average fiber diameters (dav) of 627 nm for PETI-10K 695 nm for PETI-20K, respectively. The PETI NFMs showed good thermal resistance, which is reflected in the glass transition temperatures (Tgs) above 270 °C. The PETI NFMs exhibited excellent thermoplasticity at elevated temperatures. The stainless steel adherends were successfully adhered using the PETI NFMs as the adhesives. The PI NFMs provided good adhesion to the stainless steels with the single lap shear strengths (LSS) higher than 20.0 MPa either at room temperature (25 °C) or at an elevated temperature (200 °C).

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