Experimental investigation of small-signal frequency characteristics of a bypass voltage converter

In this state we showed results of researches small-signal frequency characteristics of a bypass voltage converte

A Local Strategy to Decide the Alperin and Dade Conjectures

AbstractWe present a new strategy which exploits both the maximal andp-local subgroup structure of a given finite simple group in order to decide the Alperin and Dade conjectures for this group. We demonstrate the computational effectiveness of this approach by using it to verify these conjectures for the Conway simple group Co2

The inductive blockwise Alperin weight condition for the Chevalley groups F4(q)F_4(q)

We verify the inductive blockwise Alperin weight condition in odd characteristic $\ell$ for the finite exceptional Chevalley groups $F_4(q)$ for $q$ not divisible by $\ell$.Comment: 151 pages, extensive appendix with table

Trade-offs between growth, storage and defense in plants under carbon limitation

The fate of C, i.e. C allocation, plays a fundamental role in growth, survival and reproduction of organisms, particularly sessile organisms like plants that cannot escape harsh environmental conditions thus have to deal with stress with locally limited resources. Rapidly changing climate in recent years, for example drought and heat-enhanced insect outbreaks, and elevated atmospheric CO2 concentrations as well as rising air temperature, have sparked our interest in understanding, among others, how plants allocate C into growth, nonstructural carbohydrates (NSC) storage, secondary metabolites (SM) and biogenic volatile organic compounds (BVOC). By reducing CO2 thus forcing plants into a severe resource trade-off, I provide empirical evidence for the allocation priorities and the underlying control mechanisms. ..

A thermal bonding method for manufacturing Micromegas detectors

For manufacturing Micromegas detectors, the "bulk" method based on photoetching, was successfully developed and widely used in nuclear and particle physics experiments. However, the complexity of the method requires a considerable number of advanced instruments and processing, limiting the accessibility of this method for production of Micromegas detectors. In view of these limitations with the bulk method, a new method based on thermal bonding technique (TBM) has been developed to manufacture Micromegas detectors in a much simplified and efficient way without etching. This paper describes the TBM in detail and presents performance of the Micromegas detectors built with the TBM. The effectiveness of this method was investigated by testing Micromegas detector prototypes built with the method. Both X-rays and electron beams were used to characterize the prototypes in a gas mixture of argon and CO2 (7%). A typical energy resolution of ~16% (full width at half maximum, FWHM) and an absolute gain greater than 10^4 were obtained with 5.9 keV X-rays. Detection efficiency greater than 98% and a spatial resolution of ~65 {\mu}m were achieved using a 5 GeV electron beam at the DESY test-beam facility. The gas gain of a Micromegas detector could reach up to 10^5 with a uniformity of better than 10% when the size of the avalanche gap was optimized thanks to the flexibility of the TBM in defining the gap. Additionally, the TBM facilitates the exploration of new detector structures based on Micromegas owing to the much-simplified operation with the method.Comment: 15 pages, 17 figure

Elementary abelian subgroups: from algebraic groups to finite groups

We describe a new approach for classifying conjugacy classes of elementary abelian subgroups in simple algebraic groups over an algebraically closed field, and understanding the normaliser and centraliser structure of these. For toral subgroups, we give an effective classification algorithm. For non-toral elementary abelian subgroups, we focus on algebraic groups of exceptional type with a view to future applications, and in this case we provide tables explicitly describing the subgroups and their local structure. We then describe how to transfer results to the corresponding finite groups of Lie type using the Lang-Steinberg Theorem; this will be used in forthcoming work to complete the classification of elementary abelian p-subgroups for torsion primes p in finite groups of exceptional Lie type. Such classification results are important for determining the maximal p-local subgroups and p-radical subgroups, both of which play a crucial role in modular representation theory