Theoretical and experimental studies of the dissociation dynamics of methaniminium cation, CH2NH2+→CHNH++H2: Reaction path bifurcation

2001 ◽  
Vol 114 (14) ◽  
pp. 6051-6057 ◽  
Author(s):  
Tae Hoon Choi ◽  
Sang Tae Park ◽  
Myung Soo Kim
Keyword(s):  
Reaction Path ◽  
Experimental Studies ◽  
Dissociation Dynamics ◽  
Reaction Path Bifurcation ◽  
Path Bifurcation

scholarly journals Reaction Path Bifurcation in an Electrocyclic Reaction: Ring-Opening of the Cyclopropyl Radical

2015 ◽  
Vol 119 (25) ◽  
pp. 6611-6630 ◽  
Author(s):  
Zeb C. Kramer ◽  
Barry K. Carpenter ◽  
Gregory S. Ezra ◽  
Stephen Wiggins
Keyword(s):  
Ring Opening ◽  
Reaction Path ◽  
Electrocyclic Reaction ◽  
Reaction Path Bifurcation ◽  
Path Bifurcation

The Unimolecular Loss of HF by Simple Inorganic Ions: A Computational Dynamic Reaction Path Study

2000 ◽  
Vol 6 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Massimiliano Aschi ◽  
Felice Grandinetti
Keyword(s):  
Potential Energy Surfaces ◽  
Degrees Of Freedom ◽  
Reaction Path ◽  
Experimental Studies ◽  
Inorganic Ions ◽  
Translational Energy ◽  
Classical Dynamics ◽  
Dynamic Reaction ◽  
Accurate Analysis ◽  
Hartree Fock

The metastable dissociations of a series of simple inorganic gaseous ions of general formula (H,F,M)+, including NF3H+ (M = NF2), N2F2H+ (M = FN2), F2NOH2+ (M = FNOH) and FNOH+ (M = NO) have been investigated using classical dynamics in order to rationalise their mass-analysed ion kinetic energy (MIKE) spectra which, from earlier experimental studies, showed the systematic loss of neutral hydrofluoric acid, HF, accompanied by a fairly large release of translational energy ( T). All the simulations were initiated in correspondence of the transition structures involved in the above decompositions and expanded on the related Hartree–Fock potential energy surfaces, calculated “on the fly” during the evolution of the trajectories according to the Dynamic Reaction Path methodology. The initial associated momenta were deduced by performing a standard kinetic analysis of the above dissociations taking into account the specific features of the MIKE experiments. For all the above ions, the resulting computed Ts are in reasonable agreement with the experimental values. In addition, from a more accurate analysis of the trajectories, it could be possible to appreciate qualitatively both the specific role of the internal degrees of freedom of the decomposing ions and the dynamic and energetic influence of the HF–M+ ion–neutral complex located between the dissociation products and the tight transition structure involved in the above decompositions.

Use of 2½ D imaging in analysis of NiTi martensite

1978 ◽  
Vol 36 (1) ◽  
pp. 610-611
Author(s):  
G. M. Michal
Keyword(s):  
Memory Effect ◽  
Monoclinic Phase ◽  
Reaction Path ◽  
Structural Characteristics ◽  
Salient Feature ◽  
Martensite Phase ◽  
Orientation Relationships ◽  
Low Symmetry ◽  
Hydride Phases ◽  
Unusual Shape

Several TEM investigations have attempted to correlate the structural characteristics to the unusual shape memory effect in NiTi, the consensus being the essence of the memory effect is ostensible manifest in the structure of NiTi transforming martensitic- ally from a B2 ordered lattice to a low temperature monoclinic phase. Commensurate with the low symmetry of the martensite phase, many variants may form from the B2 lattice explaining the very complex transformed microstructure. The microstructure may also be complicated by the enhanced formation of oxide or hydride phases and precipitation of intermetallic compounds by electron beam exposure. Variants are typically found in selfaccommodation groups with members of a group internally twinned and the twins themselves are often observed to be internally twinned. Often the most salient feature of a group of variants is their close clustering around a given orientation. Analysis of such orientation relationships may be a key to determining the nature of the reaction path that gives the transformation its apparently perfect reversibility.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

Effects of Attachment Styles on the Experience of Equity in Heterosexual Couples Relationships

2003 ◽  
Vol 50 (4) ◽  
pp. 298-310 ◽  
Author(s):  
Ina Grau ◽  
Jörg Doll
Keyword(s):  
Attachment Theory ◽  
Attachment Style ◽  
Intimate Relationships ◽  
Attachment Styles ◽  
Experimental Studies ◽  
The Other ◽  
Heterosexual Couples ◽  
Secure Attachment ◽  
Dependent Variables ◽  
Equity Ratio

Abstract. Employing one correlational and two experimental studies, this paper examines the influence of attachment styles (secure, anxious, avoidant) on a person’s experience of equity in intimate relationships. While one experimental study employed a priming technique to stimulate the different attachment styles, the other involved vignettes describing fictitious characters with typical attachment styles. As the specific hypotheses about the single equity components have been developed on the basis of the attachment theory, the equity ratio itself and the four equity components (own outcome, own input, partner’s outcome, partner’s input) are analyzed as dependent variables. While partners with a secure attachment style tend to describe their relationship as equitable (i.e., they give and take extensively), partners who feel anxious about their relationship generally see themselves as being in an inequitable, disadvantaged position (i.e., they receive little from their partner). The hypothesis that avoidant partners would feel advantaged as they were less committed was only supported by the correlational study. Against expectations, the results of both experiments indicate that avoidant partners generally see themselves (or see avoidant vignettes) as being treated equitably, but that there is less emotional exchange than is the case with secure partners. Avoidant partners give and take less than secure ones.

Exneriana – II – The Scientific Legacy of John E. Exner, Jr. 1Part of this paper was presented at the XIXth International Congress of Rorschach and Projective Methods, July 22–26, 2008, Louvain, Belgium.

2008 ◽  
Vol 29 (2) ◽  
pp. 81-107 ◽  
Author(s):  
Anne Andronikof
Keyword(s):  
Clinical Studies ◽  
Experimental Studies ◽  
Scientific Work ◽  
International Congress ◽  
Response Process ◽  
Scientific Legacy ◽  
Projective Test ◽  
Projective Methods ◽  
Comprehensive Picture ◽  
Complex Mechanisms

Based on an analysis of John Exner’s peer-reviewed published work from 1959 to 2007, plus a brief comment for an editorial in Rorschachiana, the author draws a comprehensive picture of the scientific work of this outstanding personality. The article is divided into three sections: (1) the experimental studies on the Rorschach, (2) the clinical studies using the Rorschach, and (3) Exner’s “testament,” which we draw from the last paper he saw published before his death (Exner, 2001/2002). The experimental studies were aimed at better understanding the nature of the test, in particular the respective roles of perception and projection in the response process. These fundamental studies led to a deeper understanding of the complex mechanisms involved in the Rorschach responses and introduced some hypotheses about the intentions of the author of the test. The latter were subsequently confirmed by the preparatory sketches and documents of Hermann Rorschach, which today can be seen at the H. Rorschach Archives and Museum in Bern (Switzerland). Exner’s research has evidenced the notion that the Rorschach is a perceptive-cognitive-projective test.

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