Audible squeaking has put the reputation of ceramic bearings for total hip replacements into question. Inter-articular friction induces vibrations in the ceramic head which are transferred through the head-taper interface to the femoral stem. If excited to sufficient amplitudes, squeaking can be emitted by the stem. Hence, the damping and amplification properties of this interface have a crucial influence on stem vibrations.The aim of this study was to determine the vibration transfer behavior between the head and the taper of a femoral stem and its dependence on the assembly force, in order to assess its influence on the development of audible squeaking.A ceramic head was assembled on a titanium femoral stem taper with high and low forces. Frequency response functions characterizing the head-stem interface were determined experimentally.The interface demonstrated negligible influence on vibration transfer in the squeaking frequency range (1-5 kHz). However its damping effect in lower and higher frequency ranges was significant and some areas of amplification were also found.Although squeaking vibration was not influenced by the particular interface studied, the method established can be utilized to trace taper designs with dynamic properties that decrease the susceptibility to squeaking. (C) 2013 IPEM. Published by Elsevier Ltd. All rights reserved.

It is well known that ball joints may be subject to friction induced oscillations. In the present analysis the stability behavior of a ball joint model with Coulomb and Stribeck-type friction is studied and the post bifurcation behavior of the resulting limit cycles is determined.The bifurcating limit cycles can be followed for both types of friction, and velocity dependent friction is not necessary to yield vibrations, as was proposed in the literature before. The linear instability is found to be of the whirl or flutter type.The results suggest that, depending on the ball joint and friction parameters, a complicated variety of nonlinear periodic solutions exists. It is shown that the previously often used approach of computing parameter values where stable sliding turns unstable can not even serve as a first rough indicator for the existence of friction induced oscillations. Instead, existence areas for stable/unstable sliding and coexisting stable limit cycles give a far better impression of the system characteristics, and can even give hints on measures that can help to eliminate friction whirl vibrations from ball joints. The analysis yields that a low friction coefficient, low loads and high system or interface damping seem promising to calm squeaking joints, as is physically plausible. Furthermore, the combination of the momentary speed of rotation and the relative component kinematics has a huge impact on the existence of limit cycles hence the human gait is likely to influence the occurrence of squeaking in total hip arthroplasty. (C) 2013 Elsevier Masson SAS. All rights reserved.

BACKGROUND:elastic deformation of press-fitted acetabular cups during implantation provides primary stability. Excessive deformation can lead to chipping or improper seating of ceramic inlays and is dictated by cup stiffness, which also affects its vibrational characteristics. Purpose was to investigate the influence of cup design on deformation during press-fitting and on vibration properties. METHODS:deformation of ten acetabular cups (with and without ceramic inlay) was tested for radial loads clinically occurring during press-fitting (0-2000N). Eigenfrequencies were measured using experimental modal analysis and related to mass and stiffness. FINDINGS:the first eigenfrequency of the shells varied greatly (4-9kHz); insertion of inlays caused an increase (16-33 kHz). The range of shell stiffness was high (2.7-48.4kN/mm), increasing due to inlay insertion (124.7-376.2kN/mm). Stiffness and mass were sufficient predictors for eigenfrequencies (p<0.001,R²=0.94). INTERPRETATION:the cups investigated represent a large stiffness range. Lower cup stiffness can increase primary stability but jeopardize inlay seating, and a suitable balance must be achieved by the designer. Eigenfrequencies also decrease with decreasing stiffness but were all found to lie considerably above clinically observed squeaking frequencies, indicating that these cup designs play no predominant role in the squeaking phenomenon. The observed relation between eigenfrequencies and the quotient of stiffness and mass might be used in the development of new thin walled cup designs so that their contribution to system vibrations is prevented. Presently, surgeons should be aware of the deformation characteristics of cups in order to select a suitable press-fit magnitude.

Squeaking is reported for ceramic-on-ceramic hip arthroplasty, and risk factors leading to this phenomenon have been investigated empirically in the past, this way giving hints to when this phenomenon occurs. The aim of this study is to present an experimentally validated explanation for the dynamical mechanism underlying the squeak, i.e. a description of what happens when noise is generated. First the kinematics of the ceramic bearing couple in relative motion are reconsidered. The relative motion at the contact zone can be understood as superposition of relative rotation and translation. The relative weight of both components depends substantially on the instantaneous load vector, which primarily determines the position of the contact area, and the instantaneous relative rotation vector. For the investigated gait scenarios, both load vector and rotation axis vary strongly during the gait cycle. Second, experimental vibration analysis during squeak is performed. A pronounced micrometer scale elliptical motion of the ball inside the liner is found. It is shown that the rotational component of the relative kinematics during gait indeed leads to friction induced vibrations. We show that a generic whirl type friction induced flutter instability, also known from similar (non bio-) mechanical systems, is the root cause of the emitted squeaking noise. Based on the identified mechanism, the role of THA system parameters (materials, design), patient risk factors, as well as the role of the gait cycle, will have to be reconsidered and linked in the future to develop effective measures against squeaking.

Squeaking of hip replacements with ceramic-on-ceramic bearings has put the use of this material into question despite its superior wear behavior. Squeaking has been related to implant design. The purpose of this study was to determine the influence of particular acetabular cup and femoral stem designs on the incidence of squeaking and its characteristics. The dynamic behavior of the stem, head and stem assembled with head was investigated by determining their eigenfrequencies using experimental and numerical modal analysis. Four different stem and three different cup designs were investigated. Operational system vibrations resulting in audible squeaking were reproduced in a hip simulator and related to the respective component eigenfrequencies. The applied joint load and bearing clearance were varied in the clinically relevant range. Stems with lower eigenfrequencies were related to lower squeaking frequencies and increased acoustic pressure (loudness), and therefore to a higher susceptibility to squeaking. Higher load increased the squeaking frequency, while the acoustic pressure remained unchanged. No influence of the clearance or the cup design was found. Stem design was found to have an important influence on squeaking characteristics and its incidence, confirming and explaining similar clinical observations. Cup design itself was found to have no major influence on the dynamic behavior of the system but plays an important indirect role in influencing the magnitude of friction: Squeaking only occurs if the friction in the joint articulation is sufficient to excite vibrations to audible magnitudes. If friction is low, no squeaking occurs with any of the designs investigated.

Hip endoprosthesis systems are analyzed with respect to their susceptibility to self-excited vibrations and sound or noise generation. Experimental studies reveal that certain configurations can become unstable causing exponentially growing regular high-frequency oscillations that asymptotically approach a limit-cycle with considerable amplitude. Ultimately the vibrations do also lead to the emission of sound that is perceived as squeaking or squeal. To identify dominant influence factors and critical parameters, stability analyses were conducted on the basis of finite-element modeling. The resulting numerical approach, based on the determination of complex eigenvalues and eigenvectors, is shown to be an effective tool to analyze and show differences between endoprosthesis designs with respect to their susceptibility to develop squeaking phenomenons.

A hip replacement system is analysed with respect to its susceptibility to friction induced vibrations under laboratory conditions and in a pseudo‐in vivo setup. The method of complex eigenvalue extraction within the framework of finite‐element modelling and analysis is used to identify the geometric properties and system parameters that might lead to unstable sliding states. The approach presented reveals negatively damped eigenmodes for both the pseudoin vivo setup and the not‐implanted system under laboratory conditions without boundary conditions (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

A bioactive and bioresorbable scaffold fabricated from medical grade poly (epsilon-caprolactone) and incorporating 20% beta-tricalcium phosphate (mPCL–TCP) was recently developed for bone regeneration at load bearing sites. In the present study, we aimed to evaluate bone ingrowth into mPCL–TCP in a large animal model of lumbar interbody fusion. Six pigs underwent a 2-level (L3/4; L5/6) anterior lumbar interbody fusion (ALIF) implanted with mPCL–TCP + 0.6 mg rhBMP-2 as treatment group while four other pigs implanted with autogenous bone graft served as control. Computed tomographic scanning and histology revealed complete defect bridging in all (100%) specimen from the treatment group as early as 3 months. Histological evidence of continuing bone remodeling and maturation was observed at 6 months. In the control group, only partial bridging was observed at 3 months and only 50% of segments in this group showed complete defect bridging at 6 months. Furthermore, 25% of segments in the control group showed evidence of graft fracture, resorption and pseudoarthrosis. In contrast, no evidence of graft fractures, pseudoarthrosis or foreign body reaction was observed in the treatment group. These results reveal that mPCL–TCP scaffolds could act as bone graft substitutes by providing a suitable environment for bone regeneration in a dynamic load bearing setting such as in a porcine model of interbody spine fusion.

Zeitschrift für ChemieVolume 27, Issue 3 p. 103-103 Kurze Originalmitteilungen Ein einfaches Modell zur Bestimmung der Lösungsmittelrelaxation und Solvatationsenergie in angeregten Molekülzuständen Rainer Thieme, Rainer Thieme Karl-Marx-Universität, Sektionen Chemie, Leipzig, DDR-7010Search for more papers by this authorCornelius Weiss, Cornelius Weiss Karl-Marx-Universität, Sektionen Chemie, Leipzig, DDR-7010Search for more papers by this authorHans-Jörg Hofmann, Hans-Jörg Hofmann Karl-Marx-Universität, Biowissenschaften, Leipzig, DDR-7010Search for more papers by this authorGustav Peinel, Gustav Peinel Karl-Marx-Universität, Physik, Leipzig, DDR-7010Search for more papers by this authorAchim Mehlhorn, Achim Mehlhorn Technische Universität Dresden, Sektion Chemie, Dresden, DDR-8027 (4)Search for more papers by this author Rainer Thieme, Rainer Thieme Karl-Marx-Universität, Sektionen Chemie, Leipzig, DDR-7010Search for more papers by this authorCornelius Weiss, Cornelius Weiss Karl-Marx-Universität, Sektionen Chemie, Leipzig, DDR-7010Search for more papers by this authorHans-Jörg Hofmann, Hans-Jörg Hofmann Karl-Marx-Universität, Biowissenschaften, Leipzig, DDR-7010Search for more papers by this authorGustav Peinel, Gustav Peinel Karl-Marx-Universität, Physik, Leipzig, DDR-7010Search for more papers by this authorAchim Mehlhorn, Achim Mehlhorn Technische Universität Dresden, Sektion Chemie, Dresden, DDR-8027 (4)Search for more papers by this author First published: März 1987 https://doi.org/10.1002/zfch.19870270311AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume27, Issue3März 1987Pages 103-103 RelatedInformation

Journal für Praktische ChemieVolume 328, Issue 5-6 p. 937-940 Arbeitsvorschriften und Meßergebnisse Untersuchungen zur photochemischen Ausbleichung von tautomeriefähigen Azofarbstoffen. VII. Quantenchemische Berechnungen zur Ausbleichung von Hydrazonen Investigations of the Photofading of Tautomeric Azo Dyes. VII. Quantumchemical Calculations for the Fading Behaviour of Hydrazones Dr. H. Mustroph, Corresponding Author Dr. H. Mustroph VEB Filmfabrik Wolfen, Direktorat Forschung und Entwicklung, DDR-4440 Wolfen 1VEB Filmfabrik Wolfen, Direktorat Forschung und Entwicklung, DDR-4440 Wolfen 1Search for more papers by this authorDr. sc. C. Weiss, Dr. sc. C. Weiss Karl-Marx-Universität Leipzig, Sektion Chemie, DDR-7010 Leipzig, Talstraße 35Search for more papers by this author Dr. H. Mustroph, Corresponding Author Dr. H. Mustroph VEB Filmfabrik Wolfen, Direktorat Forschung und Entwicklung, DDR-4440 Wolfen 1VEB Filmfabrik Wolfen, Direktorat Forschung und Entwicklung, DDR-4440 Wolfen 1Search for more papers by this authorDr. sc. C. Weiss, Dr. sc. C. Weiss Karl-Marx-Universität Leipzig, Sektion Chemie, DDR-7010 Leipzig, Talstraße 35Search for more papers by this author First published: 1986 https://doi.org/10.1002/prac.19863280539Citations: 4AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume328, Issue5-61986Pages 937-940 RelatedInformation

Using the Huron-Claverie solvation model the conformations of 1-methyl-1,4-dihydronicotinamide (II) and corresponding quaternary ion III have been investigated by the semiempirical NDDO method. The calculated data show that anti-conformers IIb and IIIb should be more stabilized by polar solvents than syn-conformers IIa and IIIa, respectively, mainly due to electrostatic contributions within solvation energy.

Zeitschrift für ChemieVolume 23, Issue 2 p. 61-62 Kurze Originalmitteilungen Quantenchemische Berechnungen zur Interpretation des photochemischen Ausbleichmechanismus von 1-Phenylazonaphth-2-olen† Heinz Mustroph, Heinz Mustroph Fotochemisches Kombinat, VEB Filmfabrik Wolfen, Direktorat F/E, 4440 Wolfen 1Search for more papers by this authorCornelius Weiss, Cornelius Weiss Karl-Marx-Universität, Sektion Chemie, 7010 Leipzig, Liebigstraße 18Search for more papers by this author Heinz Mustroph, Heinz Mustroph Fotochemisches Kombinat, VEB Filmfabrik Wolfen, Direktorat F/E, 4440 Wolfen 1Search for more papers by this authorCornelius Weiss, Cornelius Weiss Karl-Marx-Universität, Sektion Chemie, 7010 Leipzig, Liebigstraße 18Search for more papers by this author First published: Februar 1983 https://doi.org/10.1002/zfch.19830230214Citations: 5 † IV. Mitteilung über das Ausbleichverhalten von tautomeriefähigen Azofarbstoffen; III. Mitteilung s. Haeßner, R.; Epperlein, J.: J. Signal AM 10 (1982) 373. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume23, Issue2Februar 1983Pages 61-62 RelatedInformation

Zeitschrift für ChemieVolume 22, Issue 10 p. 381-382 Kurze Originalmitteilungen Eine quantenchemische Bestätigung der Konfiguration des Pentamethinmerocyanins† Rainer Thieme, Rainer Thieme Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstraße 18Search for more papers by this authorFritz Dietz, Fritz Dietz Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstraße 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstraße 18Search for more papers by this author Rainer Thieme, Rainer Thieme Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstraße 18Search for more papers by this authorFritz Dietz, Fritz Dietz Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstraße 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstraße 18Search for more papers by this author First published: Oktober 1982 https://doi.org/10.1002/zfch.19820221009Citations: 1 † 8. Mitteilung über die theoretische Beschreibung von Solvatationseinflüssen, 7. Mitteilung s. Dietz, F.; Förster, W.; Thieme, R.; Weiss, C.: Z. Chem. 22 (1982) 144 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume22, Issue10Oktober 1982Pages 381-382 RelatedInformation

Zeitschrift für ChemieVolume 22, Issue 4 p. 144-145 Kurze Originalmitteilungen Quantenchemische Rechnungen zum Lösungsmitteleinfluß auf die behinderte Rotation der Dimethylaminogruppe in Merocyaninen† Fritz Dietz, Fritz Dietz Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorWilfried Förster, Wilfried Förster Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorBainer Thieme, Bainer Thieme Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author Fritz Dietz, Fritz Dietz Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorWilfried Förster, Wilfried Förster Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorBainer Thieme, Bainer Thieme Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität Leipzig, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author First published: April 1982 https://doi.org/10.1002/zfch.19820220414Citations: 2 † 7. Mitteilung-über die theoretische Beschreibung von Solvatationseinflüssen, 6. Mitteilung s. Krebs, C.; Hofmann, H.-J.; Weiss, C.; Weller, T.; Claverie, P.: Z. Chem. 21 (1980) 227 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume22, Issue4April 1982Pages 144-145 RelatedInformation

Zeitschrift für ChemieVolume 21, Issue 6 p. 227-228 Kurze Originalmitteilungen Zum Lösungsmitteleinfluß auf die Konformation von heteroeyclischen Aldehyden† Christine Krebs, Christine Krebs Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorHans-Jörg Hofmann, Hans-Jörg Hofmann Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorThilo Weller, Thilo Weller Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorPierre Claverie, Pierre Claverie Laboratoire de Chimie Quantique, Institut de Biologie Physico-Chimique, France — 75005 ParisSearch for more papers by this author Christine Krebs, Christine Krebs Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorHans-Jörg Hofmann, Hans-Jörg Hofmann Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorThilo Weller, Thilo Weller Sektion Chemie der Karl-Marx-Universität. DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorPierre Claverie, Pierre Claverie Laboratoire de Chimie Quantique, Institut de Biologie Physico-Chimique, France — 75005 ParisSearch for more papers by this author First published: Juni 1981 https://doi.org/10.1002/zfch.19810210617Citations: 2 † 6. Mitteilung über theoretische Beschreibung von Solvatations-einflüssen, 5. Mitteilung s. Krebs, C.; Förster, W.; Weiss, C.; Hofmann, H.-J.: J. prakt. Chem., im Druck AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Literatur 1 Mönnig, F; Dreizler, H; Rudolph, H. D.: Z. Naturforsch. 20 a (1965) 1323 Web of Science®Google Scholar 2 Mönnig, F; Dreizler, H; Rudolph, H. D.: Z. Naturforsch. 21a (1966) 1633 Google Scholar 3 Miller, F. A.: Fateley, W. G.; Witkowski, R. E.: Spectro-chim. Acta [London] 23A (1967) 891 10.1016/0584-8539(67)80016-3 Web of Science®Google Scholar 4 Drakenberg, T.: J. chem. Soc., Perkin Trans. II 1976 147 Google Scholar 5 Lunazzi, L; Macciantelli, D; Cerioni, G.: J. chem. Soc., Perkin Trans. II 1976 1791 Google Scholar 6 Abraham, R. J; Siverns, T. M.: Tetrahedron [London] 28 (1972) 3015 10.1016/0040-4020(72)80016-4 CASWeb of Science®Google Scholar 7 Danchura, W; Schaefer, T; Rowbotham, J. B; Wood, D. B.: Canad. J. Chem. 52 (1974) 3986 10.1139/v74-595 CASWeb of Science®Google Scholar 8 Hofmann, H.-J; Förster, W; Mikutta, B; Weiss, C.: Wiss. Z. Karl-Marx-Univ. Leipzig, math.-naturwiss. R., 28 (H. 6) (1979) 617 Google Scholar 9 Birnstock, F; Hofmann, H.-J; Köhkr, H.-J.: Theoret. Chim. Acta [Berlin] 42 (1976) 311 10.1007/BF00548473 CASWeb of Science®Google Scholar 10 Förster, W.: Leipzig, Univ., Dissertation 1980 Google Scholar 11 Klopman, G.: Chem. Physics Letters 1 (1967) 200 10.1016/0009-2614(67)85048-6 CASWeb of Science®Google Scholar 12 Germer, H. A.: Theoret. Chim. Acta [Berlin] 84 (1974) 145, 10.1007/BF00551365 Web of Science®Google Scholar Theoret. Chim. Acta [Berlin] 35 (1974) 273 10.1007/BF00546913 CASWeb of Science®Google Scholar 13 Onsager, L.: J. Amer. chem. Soc. 58 (1936) 1486 10.1021/ja01299a050 CASWeb of Science®Google Scholar 14 Kirkwood, J. G.: J. chem. Physics 2 (1934) 351 10.1063/1.1749489 CASGoogle Scholar 15 Huron, M.-J; Claverie, P.: J. physic. Chem. 76 (1972) 2123 10.1021/j100659a011 CASWeb of Science®Google Scholar 16 Huron, M.-J; Claverie, P.: J. physic. Chem. 78 (1974) 1853, 1862 10.1021/j100611a018 CASWeb of Science®Google Scholar 17 Claverie, P; Daudey, J. P; Langlet, J; Pullman, B; Piazzola, D; Huron, M.-J.: J. physic. Chem. 82 (1978) 405 10.1021/j100493a008 CASWeb of Science®Google Scholar 18 Pierotti, R. A.: J. physic. Chem. 67 (1963) 1840, 10.1021/j100803a024 CASWeb of Science®Google Scholar J. physic. Chem. 69 (1965) 281 10.1021/j100885a043 CASWeb of Science®Google Scholar Citing Literature Volume21, Issue6Juni 1981Pages 227-228 ReferencesRelatedInformation

Zeitschrift für ChemieVolume 21, Issue 11 p. 418-419 Kurze Originalmitteilungen Kritische Analyse genäherter LCAO-MO-Methoden;† Zum Einfluß der Geometrieoptimierung auf die Ergebnisse semiempirischer MO-Berechnungen Peter Birner, Peter Birner Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr 18Search for more papers by this authorDielmar Heidrich, Dielmar Heidrich Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr 18Search for more papers by this author Peter Birner, Peter Birner Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr 18Search for more papers by this authorDielmar Heidrich, Dielmar Heidrich Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr 18Search for more papers by this author First published: November 1981 https://doi.org/10.1002/zfch.19810211123Citations: 1 † III. Mitteilung, II. Mitteilung: vgl. [1] AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume21, Issue11November 1981Pages 418-419 RelatedInformation

Zeitschrift für ChemieVolume 20, Issue 12 p. 455-456 Kurze Originalmitteilung MNDO-Berechnungen der Nullpunktsenergien und der temperaturabhängigen Beiträge zur Freien Reaktionsenthalpie von Protonenübertragungsreaktionen† Gisela Boeck, Gisela Boeck Sektion Chemie der Wilhelm-Pieck-Universität, DDR-2500 Rostock, Buchbinderstr. 9Search for more papers by this authorHans-Joachim Köhler, Hans-Joachim Köhler Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author Gisela Boeck, Gisela Boeck Sektion Chemie der Wilhelm-Pieck-Universität, DDR-2500 Rostock, Buchbinderstr. 9Search for more papers by this authorHans-Joachim Köhler, Hans-Joachim Köhler Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author First published: Dezember 1980 https://doi.org/10.1002/zfch.19800201226Citations: 1 † 3. Mitteilung über die theoretische Behandlung von Protonenübertragungsreaktionen, 1. und 2. Mitteilung vgl. [1], [2] AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article.Citing Literature Volume20, Issue12Dezember 1980Pages 455-456 RelatedInformation

Zeitschrift für ChemieVolume 20, Issue 11 p. 426-426 Kurze Originalmitteilung MINDO/3- und MNDO-Berechnungen von Isotopenaustauschgleichgewichten Gisela Boeck, Gisela Boeck Sektion Chemie der Wilhelm-Pieck-Universität, DDR-2500 Rostock, Buchbinderstr. 9Search for more papers by this authorHans-Joachim Köhler, Hans-Joachim Köhler Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author Gisela Boeck, Gisela Boeck Sektion Chemie der Wilhelm-Pieck-Universität, DDR-2500 Rostock, Buchbinderstr. 9Search for more papers by this authorHans-Joachim Köhler, Hans-Joachim Köhler Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author First published: November 1980 https://doi.org/10.1002/zfch.19800201122Citations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume20, Issue11November 1980Pages 426-426 RelatedInformation

Zeitschrift für ChemieVolume 20, Issue 3 p. 115-116 Kurze Originalmitteilungen Modellrechnungen zum Lösungsmitteleinfluß auf Protonentransferreaktionen† Wilfried Förster, Wilfried Förster Sektion Chemie der Karl-Marx-Universität Leipzig, Arbeitsgruppe Quantenchemie, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorDietmar Nicht, Dietmar Nicht Sektion Chemie der Karl-Marx-Universität Leipzig, Arbeitsgruppe Quantenchemie, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität Leipzig, Arbeitsgruppe Quantenchemie, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author Wilfried Förster, Wilfried Förster Sektion Chemie der Karl-Marx-Universität Leipzig, Arbeitsgruppe Quantenchemie, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorDietmar Nicht, Dietmar Nicht Sektion Chemie der Karl-Marx-Universität Leipzig, Arbeitsgruppe Quantenchemie, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this authorCornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität Leipzig, Arbeitsgruppe Quantenchemie, DDR-7010 Leipzig, Liebigstr. 18Search for more papers by this author First published: März 1980 https://doi.org/10.1002/zfch.19800200329Citations: 2 † 4. Mitteilung über die theoretische Beschreibung von Solvatationseinflüssen, 3. Mitteilung vgl. [1] AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume20, Issue3März 1980Pages 115-116 RelatedInformation

Zeitschrift für ChemieVolume 19, Issue 3 p. 111-112 Kurze Originalmitteilungen NDDO-Berechnungen zur Basizität der Azine Cornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität LeipzigSearch for more papers by this authorPeter Birner, Peter Birner Sektion Chemie der Karl-Marx-Universität LeipzigSearch for more papers by this authorBarbara Will, Barbara Will Sektion Chemie der Karl-Marx-Universität LeipzigSearch for more papers by this author Cornelius Weiss, Cornelius Weiss Sektion Chemie der Karl-Marx-Universität LeipzigSearch for more papers by this authorPeter Birner, Peter Birner Sektion Chemie der Karl-Marx-Universität LeipzigSearch for more papers by this authorBarbara Will, Barbara Will Sektion Chemie der Karl-Marx-Universität LeipzigSearch for more papers by this author First published: März 1979 https://doi.org/10.1002/zfch.19790190320Citations: 2AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article.Citing Literature Volume19, Issue3März 1979Pages 111-112 RelatedInformation