40 research outputs found
Microstructure and cutting properties of unconventional high speed steels prepared by powder metallurgy
No full textTranslated from Slovak (Report of the Inst. of Materials Research, Slovak Academy of Sciences, Kosice, 1998)Available from British Library Document Supply Centre-DSC:9023.190(VR-Trans--9200)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Fracture toughness characterisation in the ductile-to-brittle transition and upper shelf regimes using pre-cracked Charpy single-edge bend specimens
No full textFracture toughness data of pre-cracked Charpy single-edge bend, SE(B), specimens are compared with those of standard compact, C(T), specimens in the upper shelf and ductile-to-brittle transition regimes. Charpy sized SE(B) specimens provide ductile fracture toughness data, which are compatible with those of standard C(T) specimens. Statistical methods such as the exponential curve fitting method (ECF), the engineering lower bound toughness method (ELB), and the Master Curve method (MC) are used to provide meaningful lower bound cleavage fracture toughness estimates from the toughness scatter of the Charpy sized SE(B) specimens in the ductile-to-brittle transition regime. In this regime, according to the ELB and MC methods, SE(B) specimens provide cleavage toughness data, which tend to be non-conservative compared to those of standard C(T) specimens. However, analyses based on the exponential curve fitting method show good agreement between the fracture toughness estimates for the C(T) and Charpy size SE(B) specimens. At the lower bound toughness level (5% cleavage failure probability), corresponding to J=100 N/mm, the ductile-to-brittle transition curves of SE(B) specimens are reduced by 5–8 °C compared to those of standard C(T) specimens according to the MC-method. A constraint correction function for SE(B) specimens is presented that can be used to make cleavage toughness data of SE(B) specimens compatible with those of standard C(T) specimens
F222 Antiresorptive effect of transdermal estradiol on bone mass in healthy, osteoporotic and fractured postmenopausal women
No full textA Non-Karplus Effect: Evidence from Phosphorus Heterocycles and DFT Calculations of the Dependence of Vicinal Phosphorus–Hydrogen NMR Coupling Constants on Lone-Pair Conformation
No full textIn contrast to literature reports of a Karplus-type curve
that
correlates 3JPH with phosphorus–hydrogen
dihedral angle, a recently reported glycine-derived 1,3,2-oxazaphospholidine
(7c) has two hydrogen atoms on the ring with identical
PNCH dihedral angles but measured coupling constants of ∼6
and 1.5 Hz. DFT calculations were in accord with these values and
suggested that the smaller coupling constant is negative. Experimental
evidence of the opposite signs of these coupling constants was obtained
by analysis of the ABX NMR spectrum of the new glycine-derived N-p-toluenesulfonyl phosphorus heterocycle 6c. DFT calculations on 6c and on Me2NPCl2 and t-BuPCl2 were also
in accord with NMR data and allowed confirmation of unusual features
including a lone pair effect on 3JPH, the negative coupling constant, temperature-dependent chemical
shifts due to rotation about the sulfonamide S–N bond, and
vicinal phosphorus–hydrogen coupling constants over 40 Hz.
Calculation of phosphorus–hydrogen coupling constants both
as a function of PYCH dihedral angle θ (Y = O, N, C) and lone
pair-PYC dihedral angle ω shows similar θ,ω surfaces
for 3JPH with a range of 3JPH from −4.4 to +51 Hz
and demonstrates the large non-Karplus effect of lone-pair conformation
on vicinal phosphorus–hydrogen coupling constants
P-208. Transvaginal colour Doppler sonography in menopausal women who had hormone replacement therapy
No full textFracture behaviour of radiolytically oxidised reactor core graphites: a view
No full textThis paper provides a view on the fracture behaviour of polygranular graphites, used to moderate gas cooled nuclear reactors. Graphite is often cited as a classic example of a brittle material because failure, in tension, is associated with small strains. However, attempts to characterise the fracture behaviour of graphite by linear elastic fracture mechanics methods have been largely unsuccessful. Observations of graphite fracture show that elastic strain energy may be dissipated by the formation of distributed microcracks, and their formation may be responsible for nonlinearity in the rising load-displacement curve. Progressive softening behaviour may also be observed in some specimens after the peak load. This type of load-displacement behaviour is a characteristic of quasi-brittle materials. Radiolytic oxidation increases the proportion of porosity within reactor core graphite so that the microstructure becomes increasingly skeletal. Consideration is given to the fracture of radiolytically oxidised graphite to support an argument for quasi-brittle behaviour. © 2010 Institute of Materials
Favorable Female Sexual Function is Associated with Patient Satisfaction after Inflatable Penile Prosthesis Implantation
No full textAbstract
Introduction
The interrelationship between male and female sexual function suggests that partner outcomes after inflatable penile prosthesis (IPP) implantation must be assessed.
Aim
We examined predictors of patient and partner satisfaction, and the relationship between patient satisfaction and female sexual function, after IPP implantation.
Methods
We designed a questionnaire (scored 1–5) assessing satisfaction with various domains related to the IPP (e.g., overall satisfaction and satisfaction related to: length, width, ease of use, and partner perception). Scores ≥3 were classified as satisfied. The Female Sexual Function Index (FSFI) was administered to the female partners of patients that underwent an IPP.
Main Outcome Measures
Independent samples Students' t-test was used to compare various FSFI domain scores in relation to male and female satisfaction. Analysis of variance test was used to assess linear regression correlation between various continuous variables.
Results
45 men and 32 partners with a mean follow-up of 2.2 years were contacted. Overall satisfaction for men and women was 3.60 and 3.62 (out of 5), respectively. Partner FSFI scores were higher, respectively, in men with higher implant satisfaction than those with lower implant satisfaction (25.09 ± 6.79 vs. 13.67 ± 12.70, P < 0.001). Regression analysis suggests a direct correlation between FSFI scores and the degree of patient (r = 0.50, r2 = 0.23; P = 0.001) and partner (r = 0.70 r2 = 0.50; P < 0.001) satisfaction with the IPP.
Conclusion
Patient satisfaction after IPP implantation implies favorable partner sexual function compared to that of unsatisfied patients. The correlation observed suggests that patients not satisfied with their IPP are likely to have female partners at high risk for female sexual dysfunction. Further interventions may be needed to improve patient and partner sexual function, particularly unsatisfied men and their female partners.
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