(n.) Mineral pitch; a black, tarry substance, burning with a bright flame; Jew's pitch. It occurs as an abundant natural product in many places, as on the shores of the Dead and Caspian Seas. It is used in cements, in the construction of pavements, etc. See Asphalt.
(n.) By extension, any one of the natural hydrocarbons, including the hard, solid, brittle varieties called asphalt, the semisolid maltha and mineral tars, the oily petroleums, and even the light, volatile naphthas.
Example Sentences:
(1) Tar bitumens are classifiable as the pyrolysis products of organic materials and are applied hot.
(2) The tests of bitumen, chlorcaoutchouc, asbestos cement and polyacryl delivered results comparable to those achieved under working conditions.
(3) Did these donations have anything to do with the investigation found, Clinton’s State Department approving the Alberta Clipper , a controversial pipeline carrying large amounts of tar-sands bitumen from Alberta to Wisconsin?
(4) There is also oil company interest in shale deposits at 10 locations in Morocco, two in Egypt as well as a "bitumen belt" in Nigeria which is already suffering major environmental damage from oil spills in the delta and the flaring of excess gas.
(5) But the huge amounts of water and solvents needed to extract oil from bitumen dramatically boost greenhouse gas output and, on latest production forecasts, will increase Canada’s CO2 emissions by 56 megatonnes by 2020 .
(6) The primary task is to ascertain whether tar bitumen can be replaced as a binder in paving for roads and what safety measures are practicable.
(7) Even plastics and bitumen which were used in the sphere of drinking water showed after an exposure time of three months up to 192 ml slime per square meter.
(8) The acute toxicity of three materials derived from Athabasca Oil Sands--(1) bitumen plus naphtha, (2) untreated naphtha (0-250 degrees C) and (3) synthetic crude oil (0-500 degrees C)--was assessed in a battery of tests.
(9) The relation of carbohydrate and protein content significantly changed from 2 at the beginning to 30 after 12 months of incubation the bitumen coating test plates.
(10) Since the bitumen-derived streams do not differ substantially in carcinogenic potency from petroleum-derived materials of comparable boiling range and process history, industrial hygiene practices which limit exposures to levels comparable to those observed in the petroleum-refining industry should provide similar measures of protection.
(11) Biological monitoring of exposure to bitumen fumes during road-paving operations was carried out.
(12) The exposure of sixteen road workers to bitumen fumes was studied.
(13) Time-weighted average values of bitumen fumes were determined by personal samplers.
(14) Mineral water and bitumen fraction induced an increase of the enzyme activity by 23, 20 and 45%, respectively.
(15) Bitumen plus naphtha administered at a concentration of 1.46 mg l-1 did not cause mortality in exposed rats or mice.
(16) A 2010 analysis by Accufacts Inc., an energy consulting firm that focuses on pipelines, identified Koch's Corpus Christi plant as one of 22 Gulf Coast refineries—out of more than 50—that is now capable of refining "a significant volume of blended bitumen," the type of crude that would flow through the Keystone XL.
(17) The village's fishing creek is contaminated; the school has been looted; the mangrove forests are coated in bitumen and everyone has left, refugees from a place blighted by the exploitation of the region's most valuable asset: crude oil.
(18) If the oil finds its way into those waters, the heavy tar sands bitumen will create a submerged disaster requiring a cleanup effort far above and beyond conventional responses.
(19) The carcinogenic potential of Athabasca tar sands and six experimental liquids derived from crude bitumen was evaluated utilizing the mouse epidermal carcinogenesis model.
(20) In the laboratory technique they have been using the American PIN-DEX system of pull-out necks, modelling of buttress construction without relief and together with the construction, in addition to ceramic facet making to chemical facet-making by means of composite bitumen made by KULZER, trade mark DENTACOLOR XS, which polymerize in Ultraviolet light.
Cement
Definition:
(n.) Any substance used for making bodies adhere to each other, as mortar, glue, etc.
(n.) A kind of calcined limestone, or a calcined mixture of clay and lime, for making mortar which will harden under water.
(n.) The powder used in cementation. See Cementation, n., 2.
(n.) Bond of union; that which unites firmly, as persons in friendship, or men in society.
(n.) The layer of bone investing the root and neck of a tooth; -- called also cementum.
(n.) To unite or cause to adhere by means of a cement.
(n.) To unite firmly or closely.
(n.) To overlay or coat with cement; as, to cement a cellar bottom.
(v. i.) To become cemented or firmly united; to cohere.
Example Sentences:
(1) In this study, a potassium nitrate-polycarboxylate cement was used as a liner and was found clinically to tend to preserve pulpal vitality and significantly eliminate or decrease postoperative pain.
(2) The incidence of femur fracture in non-cemented hip arthroplasty has been reported to be between 4.1% and 27.8%.
(3) Essential characteristics of the composite bone cement included a homogeneous and uniform fiber distribution, and a minimal increase in apparent viscosity of the polymerizing cement.
(4) Two hundred and forty root canals of extracted single-rooted teeth were prepared to the same dimension, and Dentatus posts of equal size were cemented without screwing them into the dentine.
(5) Cermet cement sealings showed defects more frequently.
(6) On Monday, the day after a party congress officially cementing Putin's candidacy in the 4 March presidential election, the top stories on Inosmi concerned modernisation, the eurozone crisis and Iran.
(7) To overcome these problems we developed methotrexate bone cement (MTX-Palacos) with the aim to obtain high local concentrations of methotrexate in order to destroy remaining tumor cells and avoid systemic side effects.
(8) The component was revised in forty-five patients, revision and advancement of the trochanteric component was done in twenty-five patients, and impinging bone or cement was removed from six patients; a combination of these procedures was done in nineteen patients.
(9) No clear population trends were seen in dental disease incidence except for cemental caries which were found among Copper and Bronze Age remains.
(10) All the flies were collected from a breeding site inside an abandoned cement building.
(11) Bone cement particles promote polyethylene wear, which in turn promotes granuloma formation, bone resorption, and subsequent bone cement disintegration.
(12) In addition, hypertension, blood group, surgical approach, and choice of cemented or cementless total hip replacement did not seem to affect the incidence of deep-vein thrombosis.
(13) The use of glass-ionomer cements in clinical dentistry has expanded greatly over the last decade.
(14) This study evaluated the bond strength between glass ionomer cements and laser-etched dentin.
(15) Microscopy revealed a spectrum of tissue reactions, ranging from a seemingly direct bone-cement contact to a fibrous membrane, up to 1.5 mm thick.
(16) Forty metal femoral cups were matched with a cemented acetabulum, while with 46 the acetabular implant was cementless.
(17) Cement was pressurized into the cavity of the anatomic specimens, and the maximum interface shear strength between the cement plug and the bone was experimentally determined for each revision.
(18) No significant differences were found among any of the cements at any of the times.
(19) With equal cementing conditions and points of measurement for all crowns, the PFM crowns were found to be significantly superior to the other crown types.
(20) This study evaluated the usefulness and accuracy of preoperative planning for cemented and cementless total hip arthroplasty (THA).