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Search Results: 1 - 10 of 3569 matches for " Jens "
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Double Quantum Entanglement to Understand Superconductivity  [PDF]
Jens Cordelair
World Journal of Condensed Matter Physics (WJCMP) , 2013, DOI: 10.4236/wjcmp.2013.34032
Abstract:

The feature of quantum entanglement in doublet and multiplet systems is briefly described and used to create a new model for the superconducting phase.

Superconductivity  [PDF]
Jens Cordelair
World Journal of Condensed Matter Physics (WJCMP) , 2014, DOI: 10.4236/wjcmp.2014.44026
Abstract: The feature of quantum entanglement is used to create a new model for the superconducting state.
Entanglement: A Modern Aspect of Nature  [PDF]
Jens Cordelair
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.53025
Abstract: The intention of this paper is to provide an easy to understand introduction to the peculiarities of entangled systems. A novel description for strong (mass entanglement) and weak (spin-or-bital and thermal entanglement) quantum entangled particles is discussed and applied to the phenomena of superconductivity, superfluidity and ultracold gases. A brief statement about how to represent the physical reality of quantum-entanglement as Quantum-Field-Theory (QFT) is noted.
Microstrip Ultra-Wideband Filter with Flexible Notch Characteristics  [PDF]
Marjan Mokhtaari, Jens Bornemann
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.31002
Abstract: A microstrip ultra-wideband (UWB) filter with unique shape, compactness, simplicity of operation and flexible notch characteristics is introduced. It is based on the fundamental and harmonic characteristics of a 50 Ohm transmission line that is grounded at both ends. The filter possesses design flexibility in the sense that it can operate as a stand-alone UWB component or include simple additional circuitry to create one or two notches within the ultra-wideband frequency range. The basic design principles are highlighted and verified using the results of two commercially available field solver packages. Individual filter structures with single and double notches are validated through measurements of a number of filter prototypes.
Broadband Feed for Low Cross-Polarization Uniplanar Tapered Slot Antennas on Low-Permittivity Substrate  [PDF]
Jan Schorer, Jens Bornemann
Wireless Engineering and Technology (WET) , 2013, DOI: 10.4236/wet.2013.41003
Abstract:

A broadband feeding technique for the uniplanar tapered slot antenna (TSA) is presented. The TSA operates at a center frequency of 6.5 GHz with a 7 GHz bandwidth (107 percent). The antenna and feed are realized with a broadband microstrip-to-slotline transition on a low permittivity high frequency substrate, Rogers RT/Duroid 5880. The input impedance of the system is designed for 50 Ω compatibility with other system components, and the cross polarization is kept below 30 dB. The developed TSA system was simulated with commercially available electromagnetic software and manufactured. Measured results validate the design process and the antenna’s performance.

Use of Mineral Liberation Analysis (MLA) in the Characterization of Lithium-Bearing Micas  [PDF]
Dirk Sandmann, Jens Gutzmer
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.16043
Abstract: The capabilities and opportunities of the application of automated mineralogy for the characterization of lithium-bearing zinnwaldite-micas are critically assessed. Samples of a crushed greisen-type ore comprising mostly of quartz, topaz and zinnwaldite (Li-rich mica) were exposed to further comminution by cone crusher and high voltage pulse power fragmentation. Product properties were analyzed by using a Mineral Liberation Analyser (MLA) and the obtained mineralogical and mineral processing relevant parameters were carefully evaluated with special focus on the characteristics of zinnwaldite. The results illustrate that both samples contain a significant quantity of very fine particles that are products of comminution. The modal mineralogy in the different sieve fractions is characterized by the accumulation of minerals of low hardness in the finest fraction and the enrichment of topaz, having a high hardness, in the somewhat larger fractions. Based on the results of mineral association data for zinnwaldite, a displacement of the muscovite-quartz ratio, in comparison to the results of modal mineralogy, was observed by indicating good quartz-zinnwaldite boundary breakage and weak muscovite-zinnwaldite breakage. Liberation as well as mineral grade recovery curves indicate that fraction 1000 to +500 μm is most suitable for beneficiation. The results of this study demonstrate that SEM-based image analysis, such as MLA, can effectively be used to investigate and evaluate phyllosilicate minerals in a fast and precise way. It is shown that the results of MLA investigations, such as modal mineralogy, are in good agreement with other analytical methods such as quantitative X-ray powder diffraction.
Outcome of Early Neurological Rehabilitation Patients Colonized with Extended-Spectrum Beta-Lactamase (ESBL) Producing Bacteria  [PDF]
Jens D. Rollnik
Open Journal of Therapy and Rehabilitation (OJTR) , 2015, DOI: 10.4236/ojtr.2015.31001
Abstract: Colonization with multidrug-resistant germs, in particular methicillin-resistant Staphylococcus aureus (MRSA) and extended-spectrum betalactamase producing bacteria (ESBL), is an emerging threat in early neurological rehabilitation. This study examined whether colonization with ESBL bacteria had deteriorating effects on neurological rehabilitation patients because of contact precautions (CP). Medical records have been carefully reviewed with respect to colonization with ESBL, outcome variables (functional independence), morbidity, and length of stay (LOS). 148/643 (23.0%) patients were ESBL positive on admission. ESBL carriers had a significantly longer LOS in early neurological rehabilitation (67.5 (42.0) vs. 25.8 (24.5), p < 0.001), worse functional status on admission (Barthel Index (BI) 13.0 (5.8) vs. 25.6 (24.1), p < 0.001), worse Glasgow Coma Scale (9.7 (3.8) vs. 12.0 (3.3), p < 0.001), worse Coma Remission Scale (9.5 (6.4) vs. 14.0 (6.8), p = 0.001), more codiagnoses (18.8 (5.1) vs. 13.3 (5.5), p < 0.001), and higher Patient Clinical Complexity Levels (PCCL). The outcome was significantly worse among ESBL positive patients (BI 28.2 (21.7) vs. 47.4 (31.0), p < 0.001; Early Rehabilitation Index -43.0 (51.7) vs. -26.0 (35.4), p < 0.001). ESBL patients had the same amount of therapy per day (136.2 (20.2) vs. 140.2 (18.7) min/day, n.s.), but the overall sum was significantly larger in the ESBL group due to longer LOS (p < 0.001). Mortality of both groups was comparable (3.8% vs. 4.1%). 54.3% of ESBL negative patients were discharged to home, but only 34.5% of ESBL colonized. 48% of ESBL positive patients were discharged to a nursing home, but only 25.1% of the ESBL free patients. Functional recovery of ESBL carriers undergoing neurological early rehabilitation is worse than that of patients without multidrug-resistant germs. Poorer outcome is not resulting from less therapy due to CP, but from functional status and higher morbidity on admission.
Current status of sentinel node biopsy in urological malignancies  [PDF]
Alexander Winter, Jens Uphoff, Jens de la Roche, Friedhelm Wawroschek
Health (Health) , 2010, DOI: 10.4236/health.2010.28126
Abstract: Like in most other malignancies the lymph node status is of outstanding prognostic relevance and an important tool for the determination of adjuvant strategies for urological tumor entities, too. Even in the era of PET/CT and MRI with iron oxid nano-particles the radiological imaging technology is strongly limited in cases of metastases smaller than 5 mm. Therefore only the operative lymph node exploration is suitable for an exact lymph node staging. The dilemma, however, is that the extended lymphadenectomy techniques feature a high morbidity and that any limitation of the dissection area results in a reduced detection rate of metastases in penile and prostate cancer. In contrast the sentinel- guided lymphadenectomy (SLND) offers a short operation time and a low morbidity without the risk of a significantly reduced detection of lymph node positive patients. As a consequence of many published papers dealing with a few thousands of patients the European Association of Urology (EAU) guidelines recommend the SLND in penile cancer (tumor stages ≥ T1G2) and as an option in prostate cancer. The latest studies of bladder, renal cell and testicular cancer promise the feasibility for these tumor entities, too. Up to which extend these thera- peutic concepts are able to replace or at least complement the default therapeutic procedures has to be shown in further studies.
Early 20th Century Climate-Driven Shift in the Dynamics of Forest Tent Caterpillar Outbreaks  [PDF]
Barry J. Cooke, Jens Roland
American Journal of Climate Change (AJCC) , 2018, DOI: 10.4236/ajcc.2018.72017
Abstract: Using tree-ring analysis, we show that the dynamics of forest tent caterpillar [Malacosoma disstria (Hbn.)] outbreaks in Alberta, Canada shifted at the turn of the 20th century from cyclic, synchronous behaviour 1850-1910 to complex, asynchronous behavior 1910-1993. This shift in dynamics coincided with the emergence in 1910 of a latitudinal gradient in outbreak stability and periodicity reflecting a similar gradient in the periodicity of winter temperatures. We postulate that the synchronizing strength of winter temperatures has diminished as a result of climate warming, and that any synchronizing strength due to inter-population migration has been superseded by regionalized patterns of periodic forcing caused by weak low-frequency variability in winter temperatures. We speculate that a decrease in polar vorticity at the start of the 20th century led to increased meridional jet stream flow and more frequent arctic weather anomalies, resulting in a loss of synchronous decadal periodicity in outbreak occurrence. These changes in insect disturbance probabilities, including rising uncertainty, have profound consequences for forest disturbance risk management.
Skein modules of links in cylinders over surfaces
Jens Lieberum
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s016117120201181x
Abstract: We define the Conway skein module 𝒞 (M) of ordered based links in a 3-manifold M. This module gives rise to 𝒞 (M)-valued invariants of usual links in M. We determine a basis of the ℤ[z]-module 𝒞 (Σ×[0,1])/Tor (𝒞 (Σ×[0,1])), where Σ is the real projective plane or a surface with boundary. For cylinders over the Möbius strip or the projective plane, we derive special properties of the Conway skein module, among them a refinement of a theorem of Hartley and Kawauchi about the Conway polynomial of strongly positive amphicheiral knots in S3. In addition, we determine the Homfly and Kauffman skein modules of Σ×[0,1] where Σ is an oriented surface with boundary.
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