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Search Results: 1 - 10 of 8952 matches for " Ben JAM Bottema "
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Teachers' ideas versus experts' descriptions of 'the good teacher' in postgraduate medical education: implications for implementation. A qualitative study
Thea CM van Roermund, Fred Tromp, Albert JJA Scherpbier, Ben JAM Bottema, Herman J Bueving
BMC Medical Education , 2011, DOI: 10.1186/1472-6920-11-42
Abstract: Recently, a new competency-based description of the good teacher was developed and introduced in all the Departments of Postgraduate Medical Education for Family Physicians in the Netherlands. We compared the views reflected in the new description with the views of teachers who were required to adopt the new framework.Qualitative study. We interviewed teachers in two Departments of Postgraduate Medical Education for Family Physicians in the Netherlands. The transcripts of the interviews were analysed independently by two researchers, who coded and categorised relevant fragments until consensus was reached on six themes. We investigated to what extent these themes matched the new description.Comparing the teachers' views with the concepts described in the new competency-based framework is like looking into two mirrors that reflect clearly dissimilar images. At least two of the themes we found are important in relation to the implementation of new educational methods: the teachers' identification and organisational culture. The latter plays an important role in the development of teachers' ideas about good teaching.The main finding of this study is the key role played by the teachers' feelings regarding their professional identity and by the local teaching culture in shaping teachers' views and expectations regarding their work. This suggests that in implementing a new teaching framework and in faculty development programmes, careful attention should be paid to teachers' existing identification model and the culture that fostered it.In times of change in medical education, teachers are often asked to adapt to a new concept of what being a good teacher includes [1,2]. These new concepts represent what is considered to be best educational practice and are often developed by experts outside the departments where the changes are to be implemented. The concepts are based on an analysis of the teachers' tasks and/or educational theory and operationalized in competency profi
Incorporating and evaluating an integrated gender-specific medicine curriculum: a survey study in Dutch GP training
Patrick W Dielissen, Ben JAM Bottema, Petra Verdonk, Toine LM Lagro-Janssen
BMC Medical Education , 2009, DOI: 10.1186/1472-6920-9-58
Abstract: The programme is designed for GP registrars throughout the 3-year GP training. The modules emphasize interaction, application, and clinically integrated learning and teaching methods in peer groups. In 2005 - 2008, after completion of each tutorial, GP registrars were asked to fill in a questionnaire on a 5-point Likert scale to assess the programme's methods and content. GP registrars were also asked to identify two learning points related to the programme.The teaching programme consists of five 3-hour modules that include gender themes related to and frequently seen by GPs such as in doctor-patient communication and cardiovascular disease. GP registrars evaluated the training course positively. The written learning points suggest that GP registrars have increased their awareness of why attention to gender-specific information is relevant.In summary, gender-specific medicine training has been successfully integrated into an existing GP training curriculum. The modules and teaching methods are transferable to other training institutes for postgraduate training. The evaluation of the teaching programme shows a positive impact on GP registrars' gender awareness.Gender-specific medicine (GSM) studies the relationship between gender and health. It is concerned with the promotion of equal opportunity and fair treatment of men and women and aims to redress current gender disparities or gender bias in the healthcare system. Both genders will benefit when GPs deliver healthcare based on education on the role of sex and gender in health and illness. [1]Various studies have revealed the importance of considering sex and gender issues when providing patient care in general practice. For instance, gender has implications in the presentation of chronic obstructive pulmonary disease (COPD). Women with COPD show higher levels of anxiety and depression and worse symptom-related quality of life than their male counterparts[2,3] A healthcare view focused on men is not unusual in medi
Dark and luminous matter in the NGC 3992 group of galaxies, II. The dwarf companions UGC 6923, UGC 6940, UGC 6969, and the Tully-Fisher relation
Roelof Bottema
Physics , 2002, DOI: 10.1051/0004-6361:20020541
Abstract: Detailed neutral hydrogen observations have been obtained of the large barred spiral galaxy NGC 3992 and its three small companion spiral galaxies, UGC 6923, UGC 6940, and UGC 6969. Contrary to the large galaxy, for the companions the HI distribution ends quite abruptly at the optical edges. Velocity fields have been constructed from which rotation curves have been derived. Assuming a reasonable M/L ratio, a decomposition of these rotation curves generates nearly equal dark matter halos. When comparing the position-velocity diagrams of the two brightest galaxies, UGC 6923 and UGC 6969, it is obvious that the rotation curve of the latter has a shape closer to solid body than the former, yet the same maximum rotational level is reached. This is likely generated by the equal dark matter halos in combination with UGC 6923 being a factor five more luminous than UGC 6969 and so its luminous matter gives a higher contribution to the rotation in the inner regions. An NFW-CDMLambda dark halo is consistent with the observed rotation curve of UGC 6923 but not consistent with the rotation curve of UGC 6969. If the NGC 3992 group is part of the Ursa Major cluster, then the I-band M/L ratio of NGC 3992 has to be at least 1.35 times as large as that of the average spiral galaxy in the cluster. On the other hand, equal M/L ratios can be achieved when the NGC 3992 group is placed more than 3 Mpc behind the cluster. Both possibilities can explain why NGC 3992 appears to be 0.43 magnitudes too faint for its rotation.
Simulations of Normal Spiral Galaxies
Roelof Bottema
Physics , 2003, DOI: 10.1046/j.1365-8711.2003.06613.x
Abstract: Results are presented of numerical simulations of normal isolated late type spiral galaxies. Specifically the galaxy NGC 628 is used as a template. The method employs a TREESPH code including stellar particles, gas particles, cooling and heating of the gas, star formation according to a Jeans criterion, and Supernova feedback. A regular spiral disc can be generated as an equilibrium situation of two opposing actions. On the one hand cooling and dissipation of the gas, on the other hand gas heating by the FUV field of young stars and SN mechanical forcing. The disc exhibits small and medium scale spiral structure of which the multiplicity increases as a function of radius. The theory of swing amplification can explain, both qualitatively and quantitatively, the emerging spiral structure. In addition, swing amplification predicts that the existence of a grand design m=2 spiral is only possible if the disc is massive. The simulations show that the galaxy is then unstable to bar formation. A general criterion is derived for the transition between bar stable and unstable, depending on disc mass contribution and on disc thickness. It seems that bar stability hardly depends on the presence of gas. A detailed quantitative analysis is made of the emerging spiral structure and a comparison is made with observations. That demonstrates that the structure of the numerical isolated galaxies is not as strong and has a larger multiplicity compared to the structure of some exemplary real galaxies. It is argued that a grand design can only be generated by a central bar or by tidal forces resulting from an encounter with another galaxy.
The maximum rotation of a galactic disc
Roelof Bottema
Physics , 1997,
Abstract: The observed stellar velocity dispersions of galactic discs show that the maximum rotation of a disc is on average 63% of the observed maximum rotation. This criterion can, however, not be applied to small or low surface brightness (LSB) galaxies because such systems show, in general, a continuously rising rotation curve until the outermost measured radial position. That is why a general relation has been derived, giving the maximum rotation for a disc depending on the luminosity, surface brightness, and colour of the disc. As a physical basis of this relation serves an adopted fixed mass-to-light ratio as a function of colour. That functionality is consistent with results from population synthesis models and its absolute value is determined from the observed stellar velocity dispersions. The derived maximum disc rotation is compared with a number of observed maximum rotations, clearly demonstrating the need for appreciable amounts of dark matter in the disc region and even more so for LSB galaxies. Matters have been illustrated for two examples; the galaxy NGC 6503 and LSB galaxy NGC 1560.
The kinematics of the bulge and the disc of NGC 7331
Roelof Bottema
Physics , 1999,
Abstract: Presented are spectroscopic emission and absorption line observations along the major axis of the Sb galaxy NGC 7331. The kinematics of the ionized gas and the stars appears to be regular, but contrary to what one might expect, the emission line gas rotates slower than the stars in the inner regions. This may be caused by an inner inclined and warped gas layer. In the bulge region the absorption line profiles have a shallow extension towards the systemic velocity, but no counterrotation is observed which is contrary to previous claims. These claims might have been based on a wrong interpretation of the employed analysis method. A kinematical model has been made in order to explain the observed sizes and shapes of the absorption line profiles. It appeared necessary to combine a rapidly rotating disc having a radially decreasing velocity dispersion with a slowly rotating constant dispersion bulge. Then, simultaneously, the observed stellar radial velocities, the velocity dispersions and the observed asymmetry of the line profile could be explained satisfactorily. An even better fit to the data can be achieved when the disc is relatively thinner and colder inside the bulge region. For the disc a M/L ratio of 1.6 +/- 0.7 is derived in the I band. On the other hand, a rotation curve fit gives a M/L ratio of 6.8 +/- 1 for the bulge. An analysis of a sample of galactic discs and bulges shows that on average the mass-to-light ratio of the bulge is three times as large as the mass-to-light ratio of the disc in the I band. For the B-band this ratio goes up to 7.2.
Variants colorés chez le Mouton Néerlandais des Landes de bruyère (Heideschaap)
JJ Lauvergne, S Bottema
Genetics Selection Evolution , 1979, DOI: 10.1186/1297-9686-11-1-1
Comparison of methods to extend part lactation records
JAM von Arendonk
Genetics Selection Evolution , 1982, DOI: 10.1186/1297-9686-14-1-118b
Numerical and experimental investigation of bolted joints
JE Jam, NO Ghaziani
International Journal of Engineering, Science and Technology , 2011,
Abstract: In this study, the behavior and the damage caused in the bolt joints in sandwich structures with laminates made of glass fiber and foam core is investigated. Many investigators have studied the strength of mechanically bolted joints in composite structures but there is less in sandwich structures. It is performed on a fully composite airplane at the connection area of the wing to the fuselage and the landing gear. The area around the joint is surrounded by the laminates from glass layers (solid laminate) and its thickness is equal to whole thickness of sandwich panel. Different states of connection between the solid laminates, where the bolt connection is imbedded are studied. Also, the foam core around the connection is studied and the dependence of the magnitude of damage on various parameters like the connection angle, size, and the general shape of the solid laminate on buckling is evaluated. For considering the bolted joint performance, a three dimensional finite element model has been developed by ANSYS commercial code. Two proposed circular and squared shape of solid laminate has been considered. The results indicate that the squared shape as compared circular design will decrease the damage significantly. The best solid laminate interface angle (θ) which decreases the damage obtains 45o and solid laminate length is not effective in damage value. Eventually, the effect of these parameters on the local buckling due to the concentrated loading applied to the bolt connection in the sandwich structure is investigated. For confirming the analytical outcomes some experimental models were performed. For testing the analytical results a fixture has been designed. The results of the tests show that the results of the finite element analysis and those of the experimental results are closely related.
Ultra-Wideband Shorted Patch Antennas FED by Folded-Patch with Multi Resonances
Hossein Malekpoor;Shahrokh Jam
PIER B , 2012, DOI: 10.2528/PIERB12081607
Abstract: Novel designs of probe-fed broadband shorted patch antennas for ultrawideband (UWB) applications are presented in this paper. In these designs, unequal resonance arms fed by a folded patch produce multi resonances to broaden the impedance bandwidth. In the first design, the antenna consists of an asymmetric Eshaped patch, a folded-patch feed and shorting pins. This antenna is achieved by four adjacent resonances with the measured -10 dB impedance bandwidth of 76.18%. The pins are utilized to miniaturize the size of the patch. By introducing a folded ramp-shaped feed in the similar structure with the first design, a wider bandwidth with the five resonances is obtained. This improved design introduces an antenna with an impedance bandwidth of more than 110% and a considerable size reduction compared to the first antenna. The antennas present resonance tuning ability within the impedance bandwidth by varying the length of unequal arms. In addition, parametric studies are performed by investigating the effects of different key parameters on obtaining optimal designs of the proposed antennas.
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