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- Guidi, V., et al.
(författare)
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Tailoring of silicon crystals for relativistic-particle channeling
- 2005
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - : Elsevier BV. - 0168-583X .- 1872-9584. ; 234:1-2, s. 40-46
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Tidskriftsartikel (refereegranskat)abstract
- In the last years, the research on channeling of relativistic particles has progressed considerably. A significant contribution has been provided by the development of techniques for quality improvement of the crystals. In particular, a planar etching of the surfaces of the silicon crystals proved useful to remove the superficial layer, which is a region very rich in imperfections, in turn leading to greater channeling efficiency. Micro-fabrication techniques, borrowed from silicon technology, may also be useful: micro-indentation and deposition of tensile or compressive layers onto silicon samples allow one to impart an even curvature to the samples. In this way, different topologies may be envisaged, such as a bent crystal for deflection of protons and ions or an undulator to force coherent oscillations of positrons and electrons. © 2005 Elsevier B.V. All rights reserved.
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| 4. |
- Ekman, Jonas, et al.
(författare)
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Toward improved time domain stability and passivity for full-wave PEEC models
- 2006
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Ingår i: 2006 IEEE International Symposium on Electromagnetic Compatibility. - Piscataway, NJ : IEEE Communications Society. - 142440293X ; , s. 544-549
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Konferensbidrag (refereegranskat)abstract
- It is well known that time domain integral equation techniques may suffer from stability problems and frequency domain models may provide non-passive results. A main source of these issues is the delay of the coupled elements. In the classical Partial Element Equivalent Circuit (PEEC) method, a single delay was used for each couple of partial element which results in a delay differential equation with reduced stability and accuracy. In this paper, we consider multiple delay coefficients which can be used for both the time and frequency domain. Also, filters are introduced which remove unwanted eigenvalues or resonances in the partial element couplings. This can substantially improve the response of the frequency domain and the time domain models. Stability improvements also means passivity improvements.
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| 5. |
- Leijte, Joost A. P., et al.
(författare)
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Recurrence patterns of squamous cell carcinoma of the penis : Recommendations for follow-up based on a two-centre analysis of 700 patients
- 2008
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Ingår i: European Urology. - : Elsevier BV. - 0302-2838 .- 1873-7560. ; 54:1, s. 161-169
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Tidskriftsartikel (refereegranskat)abstract
- Background: Current follow-up recommendations for patients with penile carcinoma are based on small numbers of patients.Objectives: To give further insight into the recurrence patterns of penile carcinoma in different treatment settings and provide recommendations for follow up.Designs, Setting, and Participants: In this retrospective study, we analysed 700 patients from two referral centres for penile carcinoma for recurrences.Measurements: Recurrences were categorized as local, regional, or distant. The rate of local recurrences was compared between patients undergoing penile-preserving treatments and partial/total amputation. Regional recurrences were compared between patients surgically staged as pN0 or pN+ and clinically node-negative (cN0) patients subjected to a wait-and-see policy. The total recurrence rate, type of recurrence, time to recurrence, and survival were calculated.Results and Limitations: 205 out of 700 patients (29.3%) had a recurrence, consisting of 18.6% local, 9.3% regional, and 1.4% distant recurrences. Of the recurrences, 92.2% occurred within 5 yr after primary treatment. All regional and distant recurrences occurred within 50 and 16 mo, respectively. The local recurrence rate was 27.7% after penile-preserving therapy and 5.3% after amputation. The regional recurrence rate was 2.3% in patients staged as pN0, 19.1% in patients staged as pN+, and 9.1% in patients undergoing a wait-and-see policy. The 5-yr disease-specific survival was 92% after a local recurrence and 32.7% after a regional recurrence. All patients with a distant recurrence died within 22 mo. Although the number of analysed patients is substantial, the results do not necessarily reflect those of other centres using different techniques for the management of penile carcinoma.Conclusions: Patients undergoing penile-preserving therapy, patients surgically staged as pN+, and those undergoing a wait-and-see policy for the nodal status are at high risk of developing a recurrence. Follow-up recommendations are provided based on the risk and impact on survival of a recurrence.
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| 6. |
- Ruehli, A.E., et al.
(författare)
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Neutral delay differential equations from the PEEC circuit solution of Maxwell's equation
- 2006
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Ingår i: 6th IFAC Workshop on Time Delay Systems 2006. - Red Hook : Curran Associates, Inc.. - 9781605607573 ; , s. 217-222
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Konferensbidrag (refereegranskat)abstract
- The purpose of this paper is twofold. First, we present the Partial Element Equivalent Circuit (PEEC) formulation of Maxwell's equations. Second, the resultant system of neutral delay differential equations (NDDEs), arising from the time domain solution of PEEC models, and the stability of these are considered. In the classical PEEC model, single delay approximations were used for the partial elements describing the electric- and magnetic field couplings. It was shown that the resultant system of delay differential equations may become unstable for some time domain applications. In this paper, we present a systematic process for the stability and accuracy enhancement of the time domain PEEC model by improving the evaluation of the partial element based on the subdivision technique and by a filtering process.
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