Different demographic, clinical and laboratory variables have been related to the severity mortality following SARS-CoV-2 infection. Most studies applied traditional statistical methods in some cases combined with a machine learning (ML) method. This is first study date comparatively analyze five ML select one that most closely predicts patients admitted COVID-19. The aim of this single-center observational classify, based on different types variables, adult COVID-19 at increased risk...

This letter presents a passive UHF printed loop antenna with left-handed loading. The RFID reader can work at near- and far-field operation within the European (865-868 MHz) band. frequency radiation properties be modified by employing varactor diodes. Also, in near-field region having flat magnetic distribution interrogation zone. A comparative study other conventional antennas shows that achieves stronger near H-field good impedance matching. Design details, simulated results, fabricated...

In this letter, a host coplanar waveguide (CPW) loaded with modified split-ring resonators (SRR) is presented. recent publications, it has been demonstrated that the capacitive interaction between CPW line and SRRs cause of right-handed band, which degrades selectivity response. Consequently, an open-ended microstrip stub connected to rings used modify interaction, thus effective control rejection above passband. Fortunately, these stubs only affect frequency position band. As result, quite...

This paper deals with the synthesis of fiber-optic delay line filters and is organized as follows. We show how negative coefficients can be implemented using positive structures differential detection at optoelectronic conversion. possibility implies that not only lowpass, but bandpass highpass arbitrary transfer functions may implemented. Synthesis methods for based on modified versions well-known time frequency domain techniques are presented which take into account restriction nature...

In this letter, a balanced metamaterial-inspired coplanar waveguide transmission line with enhanced bandwidth is presented. The composed of basic cell two split-ring resonators, series capacitances (interdigital capacitors), wide shunt inductances (metallic strips), and four (implemented through open-ended stubs). use resonators together metallic strips provides negative permeability permittivity, respectively. Likewise, the employment additional permits to control both left- right-handed...

A 2% bandpass filter with an out-of-band rejection in excess of 30 dB was demonstrated experimentally for operation the C-band (central frequency at 4.5 GHz). Narrow bandwidth and high were achieved by cascading three double split-ring resonators (SRRs) magnetically coupled to a coplanar waveguide (CPW) pairs shunt wires between central strip ground metal layers. This configuration, directly inspired from so-called metamaterial technology, takes advantage dispersion loaded transmission line,...

In this paper, we adapt a novel mode-matching and method-of-moments hybrid technique to efficiently analyze substrate integrated waveguide (SIW) based devices. The is formulated in terms of single equivalent current. This fact used include the emergent modal weights, i.e., scattering parameters, as unknowns system equations. case, it relatively easy develop fast frequency sweep schemes that can be highly accelerate solution an arbitrary device and, result, very efficient obtained. applied...

Discusses the implementation of reconfigurable Direct Form I discrete time fiber-optic signal processors incorporating optical amplifiers. The IIR and FIR cells using 2/spl times/2, M/spl times/N, switching matrices is considered, required design conditions to be fulfilled are pointed out in each case. Once concept established, we address several topics related relevant degradation sources, namely noise round-off errors.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...

In this paper a simple geometrical modification of the well-known split-ring resonator (SRR) topology is proposed.This consists on joining opposite sides rings by means an inductive connection.Due to modification, it possible synthesize dual composite right/left handed artificial transmission line from host coplanar waveguide (CPW).In addition, quite straightforward balanced showing wider bandwidth (around 13% for 3 GHz and 8% 6 GHz) with new SRR geometry.In fact, in order design line, one...

Systemic lupus erythematosus (SLE) is a complex autoimmune disease that affects several organs and causes variable clinical symptoms. Early diagnosis currently the most effective way to save lives of patients with SLE. But it very difficult detect in early stages disease. Because this, this study proposes machine learning system help diagnose To carry out research, extreme gradient boosting method has been implemented due its performance characteristics, as allows high performance,...

The authors propose and demonstrate experimentally a novel class of flexible fastly reconfigurable fiber optic delay line filters for microwave signal processing that incorporate electrooptic electroabsorption modulators as weighting elements.

Among the IL-6 inhibitors, tocilizumab is most widely used therapeutic option in patients with SARS-CoV-2-associated severe respiratory failure (SRF). The aim of our study was to provide evidence on predictors poor outcome COVID-19 treated tocilizumab, using machine learning (ML) techniques. We conducted a retrospective study, analyzing clinical, laboratory and sociodemographic data admitted for SRF, tocilizumab. extreme gradient boost (XGB) method had highest balanced accuracy (93.16%)....

In this study, two split ring resonator-based coplanar waveguide cells operating in C-band are studied. Particularly, the lines have been loaded with double shunt strips or series gaps. The use of allows controlling electric plasma frequency, and at same time permits one to a good excitation resonators. On other hand, employment gaps provides right-handed behaviour, contrary conventional metamaterial structures for which backward propagation is obtained. Several parametric studies show...

In this paper, a novel technique for cascading generalized scattering matrices based on Krylov's iterative solver is presented. This new fully general, since it can be applied to solve the connection of an arbitrary number networks, each one with ports, and easy implement. able compute, not only modal spectra at free ports global network, but also connected so that field inside full network computed incidence. addition, used evaluate parameters network.

Fibre optic programmable filters using amplifiers, their design principles and limitations as well applications are presented.

A strategy for efficiently and accurately designing passive devices in substrate integrated waveguide (SIW) technology is going to be developed validated with the design of several filters different topologies.

A new equivalent circuit for a coplanar waveguide loaded with split ring resonators is presented. The traditional circuits that model these devices are only able to characterize the left-handed propagation band, and their response very similar real one within limited bandwidth. In contrast, this proposed broadband portray not but also right-handed occurs at higher frequencies. Besides, of kind basic cells can be adjusted in bandwidth close decade.

The use of optical amplifiers and the optical-fiber embedded Mach-Zehnder architecture to implement reconfigurable discrete-time signal processors with direct form I structures is considered. Passive fibers waveguides are used as delay lines. 2*2 directional couplers in an layout adders tapping elements. Active (waveguides) multipliers.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

The authors consider the synthesis of arbitrary fibre-optic delay line filters using a modified Padé method. Although these are inherently positive systems, we show that with negative coefficients can be implemented by suitable decomposition their impulse response together differential photodetection scheme.

Abstract In this work, the design of a right‐/left‐handed composite transmission line implementation with passband characteristics is demonstrated on 0.13 µm silicon‐germanium bipolar CMOS (SiGe BiCMOS) technology. The proposed structure formed by shorted coplanar waveguide loaded split ring resonators (SRRs). As it will be shown, controlling geometry SRRs as well their electric coupling host line, possible to achieve balanced response widespread bandwidth at millimeter wave frequencies....

A new fully modal characterisation procedure is proposed to reduce the number of unknowns needed characterise ports an arbitrary H-plane device in rectangular waveguide, so that no equivalent currents will be involved ports. Moreover, since are ports, weights scattered modes can resulting system equations. This important fact, since, find wanted weights, a subsequent projection step not necessary anymore. The method then advantageous when compared other hybrid alternatives literature, only...

We propose and give a theoretical experimental characterization (modulus, phase, group delay) of novel, double-coupler, delay line, fiber-optic filter.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

In this paper a host microstrip line loaded with complementary split ring resonators is presented. The transmission modified in order to increase the electric coupling and therefore obtain high pass behavior. analysis performed through full-wave electromagnetic simulations, equivalent circuit responses measurement of fabricated prototype. results obtained show response conversely conventional lines where narrow band obtained. final has compact size. It due electrically small dimensions used....