Considerations on Configurable Multi-Standard Antennas for Mobile Terminals Realized in LTCC Technology

This paper is an extended version of a paper presented at the EuCAP 2009 conference [1]. We present part of a long term research project that aims on designing a (re-)configurable multi-standard antenna element for 4G (4th Generation) mobile terminals based on LTCC (Low Temperature Co-fired Ceramic) technology. The antenna itself is a coupling element [2] that efficiently excites the chassis of the mobile terminal to radiate as an entire antenna. Coupling is optimized by a reactive tuning circuit. Several of these tuning circuits are realized in a single LTCC component and can be multiplexed to the antenna by a SPnT (Single Pole n Thru) antenna switch integrated into the LTCC component. The coils and capacitor in the LTCC component are configurable on the top-layer of the component. Thus, the component is configurable according to different mobile terminal chassis configurations and multiple bands

On the influence of antenna integration on the radio link of UWB systems for consumer equipment

The design of UWB systems for consumer electronic application requires the integration of the antenna for aesthetical design reason. This paper discusses the influence of the integration on the performance of UWB antennas and the entire radio link. Investigations based on numerical simulations show that the antenna performance is drastically affected when the antenna is integrated into the chassis of an application when classical UWB antenna measures like radiation pattern, ringing or delay spread are observed. In order to investigated the impact of this degradation on the radio link between different applications like DVD player and PDA in a typical living room environment propagation modeling is performed. The research shows that the less ideal classical antenna measures have only minor influence on the entire link compared to the influence of the indoor channel

W+W−W^+W^- production at hadron colliders in NNLO QCD

Charged gauge boson pair production at the Large Hadron Collider allows detailed probes of the fundamental structure of electroweak interactions. We present precise theoretical predictions for on-shell $W^+W^-$ production that include, for the first time, QCD effects up to next-to-next-to-leading order in perturbation theory. As compared to next-to-leading order, the inclusive $W^+W^-$ cross section is enhanced by 9% at 7 TeV and 12% at 14 TeV. The residual perturbative uncertainty is at the 3% level. The severe contamination of the $W^+W^-$ cross section due to top-quark resonances is discussed in detail. Comparing different definitions of top-free $W^+W^-$ production in the four and five flavour number schemes, we demonstrate that top-quark resonances can be separated from the inclusive $W^+W^-$ cross section without significant loss of theoretical precision.Comment: 7 pages, 3 figure

Thermodynamically consistent description of the hydrodynamics of free surfaces covered by insoluble surfactants of high concentration

In this paper we propose several models that describe the dynamics of liquid films which are covered by a high concentration layer of insoluble surfactant. First, we briefly review the 'classical' hydrodynamic form of the coupled evolution equations for the film height and surfactant concentration that are well established for small concentrations. Then we re-formulate the basic model as a gradient dynamics based on an underlying free energy functional that accounts for wettability and capillarity. Based on this re-formulation in the framework of nonequilibrium thermodynamics, we propose extensions of the basic hydrodynamic model that account for (i) nonlinear equations of state, (ii) surfactant-dependent wettability, (iii) surfactant phase transitions, and (iv) substrate-mediated condensation. In passing, we discuss important differences to most of the models found in the literature.Comment: 31 pages, 2 figure

ENGAGING CLINICIANS IN A PRE-IMPLEMENTATION ASSESSMENT OF THE WOMEN & PERSON-EMPOWERED COMMUNITY ACCESS FOR REPRODUCTIVE EQUITY (WE CARE) INTERVENTION

Objectives: To assess clinicians’ perspectives on WE CARE (an emergency department (ED) family planning counseling and referral intervention that uses an online health tool and community health workers) to inform intervention design for implementation. Methods: We conducted one-on-one, semi-structured interviews with Emergency Medicine, Family Medicine, and Obstetrics & Gynecology clinicians until thematic saturation. The Consolidated Framework for Implementation Research (CFIR) informed the interview guide and was used to code all transcripts. A CFIR expert conducted an external coding audit. Results: We interviewed 30 clinicians (female (77%), ED staff (47%), white (63%), and attending physicians (43%)). WE CARE was highly acceptable. Dominant CFIR domains include: (1) Clinicians suggested Design Quality and Packaging modifications, particularly the referral processes, to promote successful implementation; (2) transportation and insurance were essential Patient Needs and Resources; (3) WE CARE was Compatible with the Value of “no missed opportunity” to help patients; (4) Compatibility with Work Processes – WE CARE posed scheduling and reimbursement challenges to clinics; (5) Clinicians expressed concerns about an ED Culture of reproductive health frustrations, resistance to change, and competing priorities. Others identified the ED “safety net” culture and long wait times as assets to the intervention; (6) WE CARE had a significant Relative Advantage over the status quo. A few clinicians identified more advantageous alternatives (e.g., WE CARE in the clinic, home, or community settings); (7) Engaging Key Stakeholders throughout the hospital was a critical implementation element. Conclusions: Clinicians contextualized several implementation constructs relevant to designing and implementing an ED family planning intervention

On the Energy Dependence of the Dipole-Proton Cross Section in Deep Inelastic Scattering

We study the dipole picture of high-energy virtual-photon-proton scattering. It is shown that different choices for the energy variable in the dipole cross section used in the literature are not related to each other by simple arguments equating the typical dipole size and the inverse photon virtuality, contrary to what is often stated. We argue that the good quality of fits to structure functions that use Bjorken-x as the energy variable - which is strictly speaking not justified in the dipole picture - can instead be understood as a consequence of the sign of scaling violations that occur for increasing Q^2 at fixed small x. We show that the dipole formula for massless quarks has the structure of a convolution. From this we obtain derivative relations between the structure function F_2 at large and small Q^2 and the dipole-proton cross section at small and large dipole size r, respectively.Comment: 27 page

Large scale analytic calculations in quantum field theories

We present a survey on the mathematical structure of zero- and single scale quantities and the associated calculation methods and function spaces in higher order perturbative calculations in relativistic renormalizable quantum field theories.Comment: 25 pages Latex, 1 style fil