↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Tyck till om SwePub Sök här!

Träfflista för sökning "LAR1:ltu ;srt2:(1990-1999)"

Search: LAR1:ltu > (1990-1999)

Result 81-90 of 6911

Sort/group result

Sort by: Hits per page:

Enumeration	Reference	Cover	Find
81.	Adolfsson, Stefan (author) Quality monitoring in pulsed GMA welding using signal processing methods 1995 Licentiate thesis (other academic/artistic)
82.	Advani, Suresh G., et al. (author) A continuum approach to determination of elastic properties of short fibre composites 1993 In: Mechanics of composite materials. - 0191-5665 .- 1573-8922. ; 29:2, s. 127-137 Journal article (peer-reviewed)
83.	Afanasieva, Rallema F, et al. (author) Comparative evaluation of the methods for determining the summary thermal insulation of special cold protective garment ensembles according to the Russian and the international standards 1999 In: Meditsina truda i promyshlennaia ekologiia. - 1026-9428. ; 12, s. 18-24 Journal article (peer-reviewed)
84.	Afanasieva, Rallema, et al. (author) Sravnitel'naia otsenka metodov opredeleniia summarnogo teplovogo soprotivleniia komplekta spetsodezhdy dlia zashchity ot kholoda, predusmostrennykh Rossiiskim i mezhdunarodnym standartami : Comparative evaluation of methods accepted by Russian and international standards to assess total resistance of special cold-proof clothing set 1999 In: Meditsina truda i promyshlennaia ekologiia. - 1026-9428. ; 12, s. 18-24 Journal article (peer-reviewed)abstract Experimental studies helped to compare methods determining and calculating total heat resistance of clothing sets accepted by Russian and international standards. Findings are that difference in the total heat resistance values calculated on humans and on dummies in relatively still air and quiet conditions is caused by measurement technique applied. Significant difference in the total heat resistance values calculated in windy conditions or during walk require further research aimed to study influence of those factors on clothes' heat resistance
85.	Agarwal, R.P., et al. (author) Selected papers of the international workshop on difference and differential inequalities, Gebze, Kocaeli, Turkey, July 3--7, 1996 1998 In: Mathematical Inequalities & Applications. - 1331-4343 .- 1848-9966. ; 1:3, s. 347-461 Journal article (peer-reviewed)
86.	Agnantiari, G., et al. (author) A Purified α-galactosidase from aspergillus niger with enhanced kinetic characteristics 1991 In: Acta Biotechnologica. - : Wiley. - 0138-4988 .- 1521-3846. ; 11:5, s. 479-484 Journal article (peer-reviewed)abstract Extracellular α-galactosidase from Aspergillus niger was purified 128-fold over the crude extract by gel filtration, ion exchange chromatography and chromatofocusing. Certain substrates and end products affected enzyme activity. Among the former p-nitrophenyl-α-galactopyranoside (PNPG) inhibited the enzyme at 1.4 mM while melibiose did not inhibit α-galactosidase at concentrations up to 50 mM. Enzymic end products such as glucose did not inhibit the enzyme at concentrations up to 100 mM while galactose exhibited a competitive inhibition with a Ki = 1.29 mM. The kinetic characteristics of the enzyme compared favourably to other microbial α-galactosidases and make it suitable for food process applications.
87.	Ahlberg, E., et al. (author) The surface oxidation of pyrite in alkaline solution 1990 In: Journal of Applied Electrochemistry. - 0021-891X .- 1572-8838. ; 20:6, s. 1033-1039 Journal article (peer-reviewed)abstract The collector-less flotation of pyrite has been studied by conventional techniques and is correlated to the electrochemical behaviour of pyrite in alkaline solution (1m NaClO4, pH 11). It was concluded that the initial oxidation of pyrite produces a hydrophobic sulphur rich surface together with hydrophilic iron hydroxide species. Also upon grinding, the surface is covered by hydrophilic species and therefore no significant flotation was obtained in the absence of a collector. However, collectorless flotation was readily obtained in an iron complexing solution like EDTA. This indicates that the remaining sulphur-rich layer is responsible for the floatability of pyrite under these conditions.
88.	Ahlenius, Elisabeth, et al. (author) Att konstruera med höghållfast stål : dimensioneringsmodeller, tillämpningar och exempel 1995 Reports (other academic/artistic)
89.	Aidanpää, Jan-Olov, et al. (author) A model for the transitional behavior of simple shear flows of disks 1992 In: Studies in Applied Mechanics. - 0922-5382. ; 31, s. 301-310 Journal article (peer-reviewed)abstract A simple one-dimensional model is suggested to simulate some aspects of the dynamics of granular shear flows. The model consists of a viscoelastic packet bouncing between two harmonically oscillating walls. The amplitude and frequency of the wall motion are related to the concentration and shear rate respectively. The dynamics of the system is studied and it is shown that periodic as well as chaotic motions are possible for different parameters and initial conditions. Results are presented in the form of time histories, power spectral densities, phase diagrams, Poincaré maps and bifurcation diagrams. Some of the characteristics present in the two-dimensional granular shear flows are present in this simple model. It is promising that such analysis can provide better understanding of the transitional behavior of the constitutive relation between the rapid shear and the quasi-static flows.
90.	Aidanpää, Jan-Olov (author) Dynamics of some vibro-impacting systems with amplitude constraints 1995 Doctoral thesis (other academic/artistic)abstract This thesis concerns the dynamics of some vibro-impacting systems with fixed or moving amplitude constraints. It is based on and includes five papers, marked A to E. Simple models of three different vibro-impacting systems with applications in the fields of impact hammers, granular flow and disk brakes in vehicles are analysed. A 2-DOF (two-degree-of-freedom) model of a threshold-limited impact hammer is studied (Paper A). The stability of a class of periodic motions is analysed. For some parameter values these periodic motions are found to be qualitatively similar to the ones observed for a corresponding 1-DOF system. At other parameter combinations, however, new kinds of periodic or chaotic motions can be observed. For low damping, phenomena resembling antiresonance for linear systems can also be observed. Granular shear flows show a transitional behaviour in the rapid flow regime as the shear speed or the concentration of the grains is varied. The motion can, for example, change from smooth and orderly to erratic and turbulent. Some aspects of this transitional behaviour in granular shear flow are studied numerically, analytically and experimentally (Papers B, C and D). Simple vibro-impacting models are suggested to get some analytical insight into the dynamics of shear layers. Results from a 1-DOF model show that for high forcing frequencies, which correspond to high shear speeds, periodic as well as chaotic motions can exist, whereas, for low forcing frequencies the vibrations are completely damped out to a stationary state (Paper B). Stability of this stationary state is studied analytically (Paper C), and experimentally (Paper D), where the motions of granular particles in a transparent shear cell are followed by using video techniques. For low shear speeds a single shear layer adjacent to the bottom boundary of the shear cell is observed. As the shear speed is increased, a transition to a random like state involving many layers is found to occur. In order to understand the phenomenon of squeal in disk brakes, a 3-DOF model is suggested to simulate the dynamics of a brake pad. The region of contact between the brake pad and the disk is described by using a coefficient of friction and distributed stiffness. The brake pad is allowed to have adjustable support locations and possibilities of impacts with its surroundings. The equilibrium state of the pad is determined by using a static analysis. The assumption is that the instability of this stationary state is a possible explanation of squeal, therefore, the stability is analysed in detail. Examples of different kinds of pad motions are presented. A rich variety of motions are found to exist including periodic, seemingly chaotic, stationary behaviour in slip, vibrations with full contact with the disk, stick-slip and impacts.

Skapa referenser, mejla, bekava och länka

Permalink

Result 81-90 of 6911

Refine your search

Type of publication: journal article (2595); conference paper (2087); reports (1055); licentiate thesis (403); doctoral thesis (292); book chapter (272); show more...; book (76); editorial collection (66); other publication (37); patent (11); editorial proceedings (9); artistic work (3); research review (3); review (2); show less...

Type of content: peer-reviewed (3851); other academic/artistic (2718); pop. science, debate, etc. (339)

Author/Editor: Forssberg, Eric (135); Shahnavaz, Houshang (96); Öberg, Sven (83); Persson, Lars-Erik (80); Jones, R. (79); Karlqvist, Lena (70); show more...; Elfgren, Lennart (66); Höglund, Erik (61); Forsling, Willis (61); Johansson, Jan (58); Öhlander, Björn (58); Lagerkvist, Anders (57); Börjesson, Per Ola (56); Magnusson, Claes (55); Ågren, Anders (54); Varna, Janis (53); Ingri, Johan (51); Zaslavsky, Arkady (50); Kaplan, Alexander (49); Sterte, Johan (49); Sunnari, Vappu (48); Sundbäck, Ulrik (47); Maligranda, Lech (46); Nordell, Bo (46); Christakopoulos, Pau ... (45); Rao, K. Hanumantha (43); Briddon, P. R. (41); Medvedev, Alexander (41); Soldatov, Alexander (40); Emborg, Mats (40); Romer, Rolf L. (40); Johansson, Örjan (40); Abrahamsson, Kenneth (39); Winkel, Jörgen (39); Talreja, Ramesh (38); Migdalas, Athanasios (38); Lexell, Jan (38); Molin, Nils-Erik (38); Berglund, Lars A. (38); Leden, Lars (38); Holmér, Ingvar (37); Tegner, Yelverton (37); Alm, Håkan (37); Lindahl, Olof (37); Stephansson, Ove (36); Euler, Norbert (36); Lindgren, Antony (36); Jonasson, Jan-Erik (35); Elming, Sten-Åke (35); Radetzki, Marian (34); show less...

University: Luleå University of Technology (6911); Lund University (71); Umeå University (70); Uppsala University (56); Mid Sweden University (37); Högskolan Dalarna (31); show more...; University of Gävle (25); Linnaeus University (24); RISE (17); Blekinge Institute of Technology (16); Linköping University (15); VTI - The Swedish National Road and Transport Research Institute (12); Royal Institute of Technology (10); Karolinska Institutet (9); Chalmers University of Technology (7); Karlstad University (5); University of Skövde (4); University of Gothenburg (3); Halmstad University (3); Stockholm University (3); Mälardalen University (2); Malmö University (2); Södertörn University (1); Swedish National Heritage Board (1); Red Cross University College (1); show less...

Language: English (5401); Swedish (1405); German (31); Finnish (27); Norwegian (11); Russian (10); show more...; French (7); Danish (3); Italian (3); Japanese (3); Chinese (3); Bulgarian (3); Spanish (2); Polish (1); Hungarian (1); show less...

Research subject (UKÄ/SCB): Engineering and Technology (4595); Natural sciences (1196); Social Sciences (356); Medical and Health Sciences (167); Humanities (56); Agricultural Sciences (20)

Year

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

Copyright © LIBRIS - National Library Systems
LIBRIS.kb.se

pil uppåt

Close

Copy and save the link in order to return to this view