Mohr effect

While it is well established that the rupture stress of both brittle and ductile materials is increased significantly by the presence of compressive stress (known as the Mohr effect), it is generally believed that a similar relationship for flow stress does not hold. However, an explanation for this paradox with considerable supporting experimental data is presented below. The fact that this discussion is limited to steady-state chip formation rules out the possibility of periodic gross cracks being involved. However, the role of microcracks is a possibility consistent with steady-state chip formation and the influence of compressive stress on the flow stress in shear. A discussion of the role microcracks can play in steady-state chip formation will follow in the next section. Hydrostatic stress plays no role in the plastic flow of metals if they have no porosity. Yielding then occurs when the von Mises criterion reaches a critical value. Merchant [7, pp. 267-275] has indicated that Barrett [10]... 

Mohr, m. Old Chem.) black, ethiopa watered fabric, moir6 watered effect, moir6 Moor negro. — mineralischer —, — Mineralmohr. MShre, /. carrot. 

Either the Mohr titration or the adsorption indicator method may be used for the determination of chlorides in neutral solution by titration with standard 0.1M silver nitrate. If the solution is acid, neutralisation may be effected with chloride-free calcium carbonate, sodium tetraborate, or sodium hydrogencarbonate. Mineral acid may also be removed by neutralising most ofthe acid with ammonia solution and then adding an excess of ammonium acetate. Titration of the neutral solution, prepared with calcium carbonate, by the adsorption indicator method is rendered easier by the addition of 5 mL of 2 per cent dextrin solution this offsets the coagulating effect of the calcium ion. If the solution is basic, it may be neutralised with chloride-free nitric acid, using phenolphthalein as indicator. 

Van Soeren, M., Mohr, T., Kjaer, M. and Graham, T., Acute effects of caffeine ingestion at rest in humans with impaired epinephrine responses. J Appl Physiol 80(3), 999 1005, 1996. 

H. He, H. Li, G. Mohr, B. Kovacs, T. Wemer, and O. S.Wolfbeis, Novel type of ion-selective fluorosensor based on the inner filter effect An optrode for potassium, Anal. Chem, 65, 123-127... 

See, e.g., J. Sucher, a Relativistic, Quantum Electrodynamic, and Weak Interaction Effects in Atoms, ed. W. Johnson, P. Mohr, andJ. Sucher (American Institute of Physics, NewYork, 1989), p. 28. 

P.J. Mohr, in Relativistic, quantum electrodynamic and weak interaction effects in atoms, edited by W.R. Johnson, P.J. Mohr, and J. Sucher (AIP, New York, 1989), p.47. 

Mohr U, Haas H, Hilfrich J The carcinogenic effects of dimethylnitrosamine and nitrosomethylurea in European hamsters Cricetus cricetus L). Br J Cancer 29 359-364, 1974... 

Reznik G, Mohr U, Kruger FW Carcinogenic effects of di-n-propylnitrosamine, P-hydrox-ypropyl- -propylnitrosamine and methyl- -propylnitrosamine on Sprague-Dawley rats. J Natl Cancer Inst 54(4) 937-943, 1975... 

Altmann HJ, Grunow W, Mohr U, et al. 1986. Effects of BHA and related phenols on the forestomach of rats. Food and Chemical Toxicology 24(10/11) 1183-1188. 

The synthesis of the module is provided in Scheme 10.5 (Kushner et al. 2007). Double alkylation of ethyl acetoacetate followed by guanidine condensation afforded alkenyl-pyrimidone intermediate 24 (Kushner et al. 2007). Isocyanate 25 was coupled to pyrimidone 24 to yield 26. Upon dimerization in DCM, RCM effectively cyclized the two UPy units (Mohr et al. 1997 Week et al. 1999). A one-pot reduction and deprotection through hydrogenation using Pearlman s catalyst gave diol module 27. Finally, capping 27 with 2-isocyanatoethyl methacrylate at both ends provided the UPy sacrificial cross-linker 28, which was thoroughly characterized by H- and C-NMR, Fourier transform IR (FTIR), and mass spectrometry. 

Mohr, U., H. Reznik-Schuller, G. Reznik, G. Grimmer, and J. Mis-feld, Investigations on the Carcinogenic Burden by Air Pollution in Man. XIV. Effects of Automobile Exhaust Condensate on the Syrian Golden Hamster Lung, Zentralbl. Bacteriol. Parasitenkd. Infectionshr. Hyg. Abt. Orig. Reihe. B, 163, 425-432 (1976). 

For the light molecules He and H2 at low temperatures (below about 50°C.) the classical theory of transport phenomena cannot be applied because of the importance of quantum effects. The Chapman-Enskog theory has been extended to take into account quantum effects independently by Uehling and Uhlenbeck (Ul, U2) and by Massey and Mohr (M7). The theory for mixtures was developed by Hellund and Uehling (H3). It is possible to distinguish between two kinds of quantum effects— diffraction effects and statistics effects the latter are not important until one reaches temperatures below about 1°K. Recently Cohen, Offerhaus, and de Boer (C4) made calculations of the self-diffusion, binary-diffusion, and thermal-diffusion coefficients of the isotopes of helium. As yet no experimental measurements of these properties are available. 

Working, P.K., Bentley, K.S., Hurtt, M.E. Mohr, K.L. (1987) Comparison of the dominant lethal effects of acrylonitrile and acrylamide in male Fischer 344 rats. Mutagenesis, 2, 215-220 Worthing, C.R. Hance, R.J., eds (1991) The Pesticide Marmal, Farnham, Surrey, British Crop... 

Steinhoff, D. Mohr, U. (1988) The question of carcinogenic effects of hydrazine. Exp. Pathol.,... 

It has been known for many years that the human brain is dependent for its norman functioning on a regular input of sensory stimuli. Sensory deprivation leads to hallucinations and finally to mental breakdown. The use of these sensory deprivation techniques by British forces in Northern Ireland(Ref 7) was the subject of an official investigation (Ref 4). This commission concluded that physical torture had not been used. But a commission set up by Amnesty International concluded that the technique clearly amounted to brutality and was dangerous both to the immediate mental health of the individual subjected to this treatment and to the long-term health of some subjects (Ref S) See also under Sound as a Weapon in Vol 9 Refs 1)G.C. Mohr etal, Effects of Low Frequency and Infiasonic Noise on Men , Aero-spaceMedicine 36 (1965), 817-824 2) R. 

Mohr s White Fire, which is very effective and scarcely ever misses fire, is composed of 24 parts of saltpetre, 7 of sulphur, and 1 of fine charcoal. The charcoal increases the inflammability of the mixture and shortens the length of time during which the light burns, but adds to its intensity. It is not permissible to use a larger amount of cnar coal than that given, as the composition, would then approach thatof gunpowder. 

McConnell EE, Chevalier HJ, Hesterberg TW, et al. 1994. Comparison of the effects of chrysotile and crocidolite asbestos in rats after inhalation for 24 months. In Mohr U, Dungworth DL, Mauderly JL, et al., ed. Toxic and carcinogenic effects of solid particles in the respiratory tract. Washington, DC ILSI Press, 461-467. 

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