Miracle-dz/UniFAR-FTUs huggingface dataset:
Bandwidth and Stability Improvements of Wideband Receiver Front End Using Inductorless Low Noise Amplifier

The wideband receiver front end composed of a low noise amplifier (LNA) and a bypass path is presented. A conventional current reused LNA with an inductor as a radio frequency (RF) choke is presented to provide reused DC current path. In this brief, the proposed LNA adopts the inductorless circuit topology and the current reused technique to realize compact size, stability condition and bandwidth extension. This receiver front end is fabricated in <inline-formula> <tex-math notation="LaTeX">$0.15~{\mu }{\mathrm {m}}$ </tex-math></inline-formula> depletion mode pHEMT technology. The frequency band of the receiver front end is 5-10 GHz, and the chip area is <inline-formula> <tex-math notation="LaTeX">$0.6\,\,{\times }\,\,0.5\,\,{{\mathrm {mm}}}^{2}$ </tex-math></inline-formula>. Measured results show that the LNA gain is 21.4-11.5 dB and noise figure (NF) is less than 2.7 dB over 5-10 GHz with 34.3 mW power consumption. For the bypass path, the insertion loss is 1.8-3 dB, and the input and output return loss are better than 10 dB within 5-10 GHz.
Fast Algorithm for Simulating Lipid Vesicle Deformation I: Spherical Harmonic Approximation

Lipid vesicles appear ubiquitously in biological systems. Understanding how the mechanical and intermolecular interations deform vesicle membrane is a fundamental question in biophysics. In this article we developed a fast algorithm to compute the surface configurations of lipid vesicles by introducing the surface harmonic functions to approximate the surfaces. This parameterization of the surfaces allows an analytical computation of the membrane curvature energy and its gradient for the efficient minimization of the curvature energy using a nonlinear conjugate gradient method. Our approach drastically reduces the degrees of freedom for approximating the membrane surfaces compared to the previously developed finite element and finite difference methods. Vesicle deformations with a reduced volume larger than 0.65 can be well approximated by using as small as 49 surface harmonic functions. The method thus has a great potential to reduce the computational expense of tracking multiple vesicles which deform for their interaction with external fields.
Two weight norm inequalities for the $g$ function

Given two weights $\sigma, w$ on $\mathbb R ^{n}$, the classical $g$-function satisfies the norm inequality $\lVert g (f\sigma)\rVert_{L ^2 (w)} \lesssim \lVert f\rVert_{L ^2 (\sigma)}$ if and only if the two weight Muckenhoupt $A_2$ condition holds, and a family of testing conditions holds, namely \begin{equation*} \iint_{Q (I)} (\nabla P_t (\sigma \mathbf 1_I)(x, t))^2 \; dw \, t dt \lesssim \sigma (I) \end{equation*} uniformly over all cubes $I \subset \mathbb R ^{n}$, and $Q (I)$ is the Carleson box over $I$. A corresponding characterization for the intrinsic square function of Wilson also holds.
Seiberg-Witten Geometry of Four-Dimensional $\mathcal N=2$ Quiver Gauge Theories

Seiberg-Witten geometry of mass deformed $\mathcal N=2$ superconformal ADE quiver gauge theories in four dimensions is determined. We solve the limit shape equations derived from the gauge theory and identify the space $\mathfrak M$ of vacua of the theory with the moduli space of the genus zero holomorphic (quasi)maps to the moduli space ${\rm Bun}_{\mathbf G} (\mathcal E)$ of holomorphic $G^{\mathbb C}$-bundles on a (possibly degenerate) elliptic curve $\mathcal E$ defined in terms of the microscopic gauge couplings, for the corresponding simple ADE Lie group $G$. The integrable systems $\mathfrak P$ underlying the special geometry of $\mathfrak M$ are identified. The moduli spaces of framed $G$-instantons on ${\mathbb R}^{2} \times {\mathbb T}^{2}$, of $G$-monopoles with singularities on ${\mathbb R}^{2} \times {\mathbb S}^{1}$, the Hitchin systems on curves with punctures, as well as various spin chains play an important role in our story. We also comment on the higher-dimensional theories.
Boundary value problems for second-order elliptic operators with complex coefficients

The theory of second order complex coefficient operators of the form $\mathcal{L}=\mbox{div} A(x)\nabla$ has recently been developed under the assumption of $p$-ellipticity. In particular, if the matrix $A$ is $p$-elliptic, the solutions $u$ to $\mathcal{L}u = 0$ will satisfy a higher integrability, even though they may not be continuous in the interior. Moreover, these solutions have the property that $|u|^{p/2-1}u \in W^{1,2}_{loc}$. These properties of solutions were used by Dindo\v{s}-Pipher to solve the $L^p$ Dirichlet problem for $p$-elliptic operators whose coefficients satisfy a further regularity condition, a Carleson measure condition that has often appeared in the literature in the study of real, elliptic divergence form operators. This paper contains two main results. First, we establish solvability of the Regularity boundary value problem for this class of operators, in the same range as that of the Dirichlet problem. The Regularity problem, even in the real elliptic setting, is more delicate than the Dirichlet problem because it requires estimates on derivatives of solutions. Second, the Regularity results allow us to extend the previously established range of $L^p$ solvability of the Dirichlet problem using a theorem due to Z. Shen for general bounded sublinear operators.
G-games with coalitions

This paper models games where the strategies are nodes of a graph G (we denote them as G-games) and in presence of coalition structures. The cases of one-shot and repeated games are presented. In the latter situation, coalitions are assumed to move from a strategy to another one under the constraint that they are adjacent in the graph. We introduce novel concepts of pure and mixed equilibria which are comparable with classical Nash and Berge equilibria. A Folk Theorem for G-games of repeated type is presented. Moreover, equilibria are proven to be described through suitably defined Markov Chains, hence leading to a constrained Monte Carlo Markov Chain procedure.
Faktor-Faktor yang Mempengaruhi Keputusan Penggunaan Telemedicine saat Pandemi COVID-19

Abstract – The emergency COVID-19 pandemic bring anxiety in the world and has changed cunsomer behaviour especially in decision to use technoly in health sector. Digital health care changing cunsomer behaviour from using conventional health service to digital. Health technology, telemedicine designed for long-distance communication between doctor and patient which is considered to bring effectiveness and effictiveness during COVID-19 pandemic. This research aim to exemain perceived fear, quality of information and trust to use telemedicine during corona virus plague. This study focus on Halodoc users aged 17-45 year and using a non-probablity technique sampling. 125 respondents were collected using online questionnare. Data were analyzed using multipel linear regression method. The result showed, the information quality and trust had asignificant effect on desicion to use M-health. However, Perceived fear has a negative effect on customer desicions in using M-health. Abstrak -- Keadaan darurat wabah virus COVID-19 menyebabkan kegelisahan pada masyarakat dunia dan banyak merubah perilaku konsumen terutama dalam keputusan penggunaan teknologi dibidang kesehatan. Perawatan kesehatan secara digital mengubah perilaku konsumen dari penggunaan jasa kesehatan konsenvisonal menjadi digital. Teknologi kesehatan, telemedicine yang dirancang untuk komunikasi jarak jauh antara penyedia jasa kesehatan dengan konsumen yang dinilai membawa efektivitas dan efisiensi pada saat pandemi COVID-19. Dalam hal ini peneliti menguji perceived fear, kualitas informasi dan kepercayaan terhadap keputusan penggunaan telemedicine saat pandemi COVID-19. Penelitian ini berfokus pada pengguna M-Health Halodoc dengan rentan usia 17-45 tahun menggunakan sampel non probability teknik. 125 responden dikumpulkan dengan menggunakan kuisioner online. Data dianalisis menggunakan metode regresi linear beraganda. hasil penelitian menunjukkan kualitas informasi dan kepercayaan berpengaruh signifikan terhadap keputusan penggunaan aplikasi kesehatan. Namun, perceived fear atau rasa takut berpengaruh negatif terhadap keputusan konsumen dalam menggunakan aplikasi kesehatan.
Modulational Instability and Variational Structure

We study the modulational instability of periodic traveling waves for a class of Hamiltonian systems in one spatial dimension. We examine how the Jordan block structure of the associated linearized operator bifurcates for small values of the Floquet exponent to derive a criterion governing instability to long wavelengths perturbations in terms of the kinetic and potential energies, the momentum, the mass of the underlying wave, and their derivatives. The dispersion operator of the equation is allowed to be nonlocal, for which Evans function techniques may not be applicable. We illustrate the results by discussing analytically and numerically equations of Korteweg‐de Vries type.
Electric field effect in multilayer Cr2Ge2Te6: a ferromagnetic 2D material

The emergence of two-dimensional (2D) materials has attracted a great deal of attention due to their fascinating physical properties and potential applications for future nano-electronic devices. Since the first isolation of graphene, a Dirac material, a large family of new functional 2D materials have been discovered and characterized, including insulating 2D boron nitride, semiconducting 2D transition metal dichalcogenides and black phosphorus, and superconducting 2D bismuth strontium calcium copper oxide, molybdenum disulphide and niobium selenide, etc. Here, we report the identification of ferromagnetic thin flakes of Cr2Ge2Te6 (CGT) with thickness down to a few nanometers, which provides a very important piece to the van der Waals structures consisting of various 2D materials. We further demonstrate the giant modulation of the channel resistance of 2D CGT devices via electric field effect. Our results illustrate the gate voltage tunability of 2D CGT and the potential of CGT, a ferromagnetic 2D material, as a new functional quantum material for applications in future nanoelectronics and spintronics.
Improving Distinguishability of Photoplethysmography in Emotion Recognition Using Deep Convolutional Generative Adversarial Networks

We propose an emotion recognition framework based on ResNet, bidirectional long- and short-term memory (BiLSTM) modules, and data augmentation using a ResNet deep convolutional generative adversarial network (DCGAN) with photoplethysmography (PPG) signals as input. The emotions identified in this study were classified into two classes (positive and negative) and four classes (neutral, angry, happy, and sad). The framework achieved high recognition rates of 90.34% and 86.32% in two- and four-class emotion recognition tasks, respectively, outperforming other representative methods. Moreover, we show that the ResNet DCGAN module can synthesize samples that do not just look like those in the training set, but also capture discriminative features of the different classes. The distinguishability of the classes was enhanced when these synthetic samples were added to the original samples, which in turn improved the test accuracy of the model when trained using these mixed samples. This effect was evaluated using various quantitative and qualitative methods, including the inception score (IS), Fréchet inception distance (FID), GAN quality index (GQI), linear discriminant analysis (LDA), and Mahalanobis distance (MD).
Approximation of a generalized CSBP with interaction

In this work, we consider a discrete model of population with interaction where the birth and death rates are non linear functions of the population size. After proceeding to renormalisation of the model parameters, we obtain in the limit population size evolves as a generalized continuous state branching process (CSBP) solution of the SDE Z t = x+ ∫ t 0 f(Z r )dr + √ 2c ∫ t 0 ∫ Zx r− 0 W (dr, du) + ∫ t
Connected Components of the Moduli of Elliptic K3 Surfaces

The combinatorial type of an elliptic K3 surface with a zero section is the pair of the ADE -type of singular fibers and the torsion part of the Mordell-Weil group. We determine the set of connected components of the moduli of elliptic K3 surfaces with fixed combinatorial type. Our method relies on the theory of Miranda and Morrison on the structure of a genus of even indefinite lattices, and computer-aided calculations of p-adic quadratic forms.
Challenges faced by current Galactic planetary nebula surveys

Abstract Determining the demographics of the Galactic planetary nebula (PN) population is an important goal to further our understanding of this intriguing phase of stellar evolution. The Galactic population has more than doubled in number over the last 15 years, particularly from narrowband Hα surveys along the plane. In this review I will summarise these results, with emphasis on the time interval since the last IAU Symposium. These primarily optical surveys are not without their limitations and new surveys for PNe in the infrared similarly face a number of challenges. I will discuss the need for multi-wavelength approaches to discovery and analysis. The desire to have accurate volume-limited samples of Galactic PNe at our disposal is emphasised, which will be impacted with new data from the Gaia satellite mission. We need robust surveys of PNe and their central stars, especially volume-limited surveys, in order to clarify and quantify their evolutionary pathways.
The value of service rate flexibility in an M/M/1 queue with admission control

ABSTRACT We consider a single-server queueing system with admission control and the possibility to switch dynamically between k increasing service rate values with the service cost rate being convex in the service rate. We explore the benefit due to service rate flexibility on the optimal profit and the admission thresholds, when service payment is made upon customer's admission. We formulate a Markov Decision Process model for the problem of joint admission and service control considering both discounted and average expected profit maximization and show that the optimal policy has a threshold structure for both controls. Regarding the benefit due to flexibility, we show that it is increasing in system length and that its effect on the admission policy is to increase the admission threshold. We also derive a simple approximate condition between the admission reward and the relative cost of service rate increase, so that the service rate flexibility is beneficial. We finally show that the results extend to the corresponding model where service payment is made at the end of each service completion and differences regarding the benefit due to service flexibility with respect to the original model are pursued numerically.
Asymptotic properties of the spectrum of neutral delay differential equations

Spectral properties and transition to instability in neutral delay differential equations are investigated in the limit of large delay. An approximation of the upper boundary of stability is found and compared to an analytically derived exact stability boundary. The approximate and exact stability borders agree quite well for the large time delay, and the inclusion of a time-delayed velocity feedback improves this agreement for small delays. Theoretical results are complemented by a numerically computed spectrum of the corresponding characteristic equations.
A physically inspired model of Dip d792 and d1519 of the Kepler light curve seen at KIC8462852

The star KIC 8462852 shows a very unusual and hard to comprehend light curve. The dip d7922 absorbs 16% of the starlight. The light curve is unusually smooth but the very steep edges make it hard to find a simple natural explanation by covering due to comets or other well-known planetary objects. We describe a mathematical approximation to the light curve, which is motivated by a physically meaningful event of a large stellar beam which generates an orbiting cloud. The data might fit to the science fiction idea of star lifting, a mining technology that could extract star matter. We extend the model to d1519 and d1568 using multiple beams and get an encouraging result that fits essential parts of the dips but misses other parts of the measured flux. We recommend further exploration of this concept with refined models.
Atomic Structure of Polar Surface in SrTiO3

Rearrangement of atoms due to broken translational symmetries at the surface of SrTiO$_3$ is scarcely debatable in the present day scenario. Actual concern demands to unveil the true structure and precise mechanism responsible for atomic reconstructions at a unit cell level. Here, we reveal the atomic structure of SrTiO$_3$ surface by using annular bright field imaging in spherical aberration corrected scanning transmission electron microscope. We measure structural parameters such as lattice constant, bond length, atomic displacement and subsequently we find a polarization for the top five unit cells is ~10-20 uCcm$^{-2}$. Both Sr-O and Ti-O planes reconstruct thus contribute to net dipole moment that is towards surface. Elongation of the out of plane lattice for skin layers is also witnessed. The electron energy loss spectroscopy experiment illustrates the presence of oxygen vacancies at the surface which seems to be largely responsible for the stability of surface polarization. Our study provides a sound foundation into mechanistic understanding for structure and properties of surfaces for complex oxides. These outcomes can be considered as a pragmatic boost particularly for examining other insulator-like materials as well as in bridging gap for hitherto fewer experimental investigation along with various theoretical studies.
Merger of Two Neutron Stars: Predictions from the Two-families Scenario

If only one family of “neutron stars” exists, their maximum mass must be equal to or larger than and then, only in less than about 18% of cases, the outcome of the merger of two neutron stars is a prompt collapse to a black hole, since the newly formed system can avoid the collapse at least until differential rotation is present. In the so-called two-families scenario, stars made of hadrons are stable only up to about , while the most massive compact stars are entirely made of strange quark matter. We show that in this scenario the outcome of the merger of two compact stars, entirely composed by hadrons, is a prompt collapse in at least 34% of the cases. It will therefore be easy to discriminate between the two scenarios once the gravitational waves emitted at the moment of the merger are detected. Finally, we shortly discuss the implications of GW170817−GRB 170817A.
Edge state reconstruction from strong correlations in quantum spin Hall insulators

We study the fate of helical edge states in a quantum spin Hall insulators when the whole system is exposed to strong Coulomb interactions. Using dynamical mean-field theory, we show that the dispersion relation of the edge states is strongly affected by Coulomb interactions. In fact, the formerly gapless edge modes become gapped at a critical interaction strength. Interestingly, this critical interaction strength is significantly smaller at the edge than its counterpart in the bulk. Thus, the bulk remains in a topologically nontrivial state at intermediate interaction strengths where the edge states are already gapped out. This peculiar scenario leads to the reconstruction of gapless helical states at the new boundary between the topological bulk and the trivial (Mott insulating) edge. Further increasing the interaction strength triggers the progressive localization on the new boundary, the shrinking of the quantum spin Hall region, and the migration of the helical edge states towards the center of the system. The edge state reconstruction process is eventually interrupted by the Mott localization of the whole sample. Finally, we characterize the topological properties of the system by means of a local Chern marker.
On fillings of homotopy equivalent contact structures

This paper provides a topological method for filling contact structures on the connected sums of $S^2\times S^3$. Examples of nonsymplectomorphic strong fillings of homotopy equivalent contact structures with vanishing first Chern class on $\#_k S^2\times S^3$ $(k\geq2)$ are produced.
The Abundance Distribution in the Extrasolar-Planet Host Star HD 19994

Abundances of 22 elements have been determined from a high-resolution, high signal-to-noise spectrum of HD 19994, a star recently announced as harboring an extrasolar planet. A detailed spectroscopic analysis of this star finds it to have a mass of 1.2 ± 0.1 M⊙. HD 19994 is found to be slightly enriched in "metals" relative to the Sun ([Fe/H] = +0.09 ± 0.05 and an average of all elements of [m/H] = +0.13), as are most stars known with extrasolar planets. In an investigative search for possible signatures of accretion of metal-rich gas onto the parent stars in such systems (using HD 19994 and published abundances for other stars), it is found that a small subset of stars with planets exhibits a trend of increasing [X/H] with increasing condensation temperature for a given element X. This trend may point to the accretion of chemically fractionated solid material into the outer (thin) convection zones of these solar-type stars. It is also found that this small group of stars exhibiting an accretion signature all have large planets orbiting much closer than is found, in general, for stars with planets not showing this peculiar abundance trend, suggesting a physical link between accretion and orbital separation. In addition, the stars showing evidence of fractionated accretion are, on average, of larger mass (1.2 M⊙) than stars not showing measurable evidence of this accretion (1.0 M⊙).
A Bidirectional Battery Charger for a Wide Range of Electric Vehicles

The design and operation of the modified SEPIC converter-based bidirectional battery charger for a wide range of electric vehicles (EVs) are presented in this work. The wide range of EVs includes an electric two-wheeler (e2W) and an electric car. Therefore, the design of a modified SEPIC converter is carried out to charge an e2W with a 72 V battery and an electric car with a 240 V battery. Along with satisfactory charging operation, compliance with the IEC standard is the major advantage of the presented battery charger. Furthermore, the modified SEPIC converter-based battery charger has the advantage of bidirectional operation. To verify the effectiveness of the presented battery charger grid to a vehicle (G2V) is analyzed with the ideal grid voltage. In addition, the efficacy of the charger is verified with amplitude variations in the grid voltage. Lastly, the presented charger is tested for a vehicle-to-home (V2H) operation to verify the efficacy during the bidirectional operation.