Miracle-dz/UniFAR-FTUs huggingface dataset:
Dual-Beam Rectenna Based on a Short Series-Coupled Patch Array

The multibeam multiport antenna is a promising solution for effectively harvesting wireless low-density power in a wide angle range. The traveling-wave series-fed patch array antenna without the requirement of additional beamforming circuits is a good option. However, its application is limited by its large length or low radiation efficiency. In this work, a periodic circuit model consisting of coupled resonators is proposed and analyzed for enhancing the radiation attenuation. A series-coupled patch array based on the model is then designed. It presents a much shorter configuration and could be well applied in a scenario where a tradeoff between size and gain exists. The dc combining method that accumulates currents of rectifying branches corresponding to multiple beams is adopted in the rectifier design. The rectenna exhibits an enhanced spatial or angular coverage with a simple configuration. In the measurement, the output dc power can be more than 0.5–<inline-formula> <tex-math notation="LaTeX">$32~\mu \text{W}$ </tex-math></inline-formula> in an angle range of 90° in the H-plane and reach a maximum value of 1.1–<inline-formula> <tex-math notation="LaTeX">$50.3~\mu \text{W}$ </tex-math></inline-formula> and a maximum efficiency of 19.5%–44.6% when the power density ranges from 0.05 to <inline-formula> <tex-math notation="LaTeX">$1~\mu \text{W}/$ </tex-math></inline-formula>cm<sup>2</sup> at 2.45 GHz.
Blind AoA Estimation With Hybrid Antenna Arrays

Angle-of-arrival (AoA) information is vital for beamforming which is used to combat severe propagation loss in millimetre wave communications. Although blind AoA estimation has been extensively studied for digital array, few results were reported for hybrid array. Well known subspace-based methods such as MUSIC and ESPRIT have been successfully developed. However, their efficacy is reduced in hybrid array due to the loss of spatial degrees of freedom (DoFs). In this article, we propose a method to solve the problem. The proposed algorithm uses an augmented beamspace approach and a precoding scheme such that the lost spatial DoFs can be recovered. As a result, MUSIC and ESPRIT can be used with full capacity. Theoretical analysis is conducted to obtain lower bounds of the estimation-error variances. Simulations with an OFDM system show that the proposed method can achieve satisfactory performance and the theoretical bounds are tight.
On macroeconomic determinants of co-movements among international stock markets: evidence from DCC-MIDAS approach

This study aims to examine the macro-financial dynamics of the time-varying co-movements between the daily stock market returns of G7 and BRICS-T countries using a two-step procedure. Firstly, we decompose the dynamic conditional correlations between the daily stock market returns into the short-term (daily) and the long-term (quarterly) components using the DCC-MIDAS (Dynamic Conditional Correlation-Mixed Data Sampling) method for the period from 2002 to 2018. Then, we estimate the relationship between the quarterly DCC-MIDAS correlations and quarterly macroeconomic variables that represent the economic-financial proximity between country pairs using the System GMM (Generalized Method of Moments) method. Empirical results suggest that the most important factors which explain the long-term dynamic conditional correlations between the stock market returns of G7 and BRICS-T countries are the differences in GDP growth rates, five-year CDS risk premiums, and EPU (Economy Policy Uncertainty) indices between the country pairs.
Conceptual density functional theory based electronic structure principles

In this review article, we intend to highlight the basic electronic structure principles and various reactivity descriptors as defined within the premise of conceptual density functional theory (CDFT). Over the past several decades, CDFT has proven its worth in providing valuable insights into various static as well as time-dependent physicochemical problems. Herein, having briefly outlined the basics of CDFT, we describe various situations where CDFT based reactivity theory could be employed in order to gain insights into the underlying mechanism of several chemical processes.
Liquid-crystal ordering of photo-switchable molecules on a surface

Photo-switchable molecules are chemical compounds that undergo configurational changes upon photon absorption. In particular, azobenzene-based photo switches possess two isomeric stable states: an elongated rod-like trans state and a bent-shaped cis isomer. In this work we consider model molecules whose shape resembles that of azobenzene-based molecules and investigate their liquid-crystal assembly in two dimensions, mainly using computer simulations. The first part of our study, motivated by the recent interest in the self-assembly of complex structures in two-dimensional systems, consists in examining the influence of different molecular geometries on the stability of several spontaneously ordered phases. We perform extensive Monte Carlo simulations of a two-dimensional bent hard-needle model in both its chiral zig-zag and its achiral bow-shape configurations and present their phase diagrams. We find evidence for a variety of stable phases: isotropic, quasinematic, smectic-C, anti-ferromorphic smectic-A, and modulated-nematic. This last phase consists of layers formed by supramolecular arches. They create a modulation of the molecular polarity whose period is sensitively controlled by molecular geometry. We identify transition densities using correlation functions together with appropriately defined order parameters and compare them with predictions from Onsager theory. The contribution of the molecular excluded area to Onsager theory and simple liquid crystal phase morphology is discussed. We demonstrate the isotropic–quasi-nematic transition to be consistent with a Kosterlitz-Thouless disclination unbinding scenario. The second part of our study is motivated by the growing interest in monolayers of photo-switchable molecules. They can be used as glassy systems with light-controllable dynamics. Recent experiments have demonstrated that, in a dense monolayer of photoswitchable dye Methyl-Red molecules, the relaxation of an initial birefringence follows a power-law decay, typical for glass-like dynamics. The slow relaxation can efficiently be controlled and accelerated by illuminating the monolayer with circularly polarized light, which induces trans-cis isomerization cycles. To elucidate the microscopic mechanism, we develop a two-dimensional molecular model in which the trans and cis isomers are represented by straight and bent needles, respectively. As in the experimental system, the needles are allowed to rotate and to form overlaps but they cannot translate. The out-of-equilibrium rotational dynamics of the needles is generated using kinetic Monte Carlo simulations. We demonstrate that, in a regime of high density and low temperature, the power-law relaxation can be traced to the formation of spatio-temporal correlations in the rotational dynamics. These correlations correspond to the presence of transient domains of fastand slowly-rotating molecules, i.e., dynamic heterogeneity. We also show that the nearly isotropic cis isomers can prevent dynamic heterogeneities from forming in the monolayer and that the relaxation then becomes exponential.
Designing an Artificial Golgi reactor to achieve targeted glycosylation of monoclonal antibodies

The therapeutic efficacy of monoclonal antibodies (mAbs) is dependent on their glycosylation patterns. As the largest group of currently approved biopharmaceuticals, the microheterogeneity in mAb oligosaccharide profiles deriving from mammalian cell production is a challenge to the biopharmaceutical industry. Disengaging the glycosylation process from the cell may offer significant enhancement of product quality and allow better control and reproducibility in line with the Quality-by-Design paradigm. Three potential designs of an Artificial Golgi reactor implementing targeted sequential glycosylation of mAbs are proposed including a (1) microcapillary film reactor, (2) packed bed reactor with nonporous pellets, and (3) packed bed reactor with porous pellets. Detailed mathematical models are developed to predict their performance for a range of design and operational parameters. While all three reactor designs can achieve desired conversion levels, the choice of a particular one depends on the required throughput and the associated cost of enzymes and co-substrates. © 2016 The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers AIChE J, 62: 2959–2973, 2016
The magnitude and determinants of antepartum depression among women attending antenatal clinic at a tertiary hospital, in Mwanza Tanzania: a cross-sectional study

Introduction there is an increased vulnerability for the development of common mental disorders during the peripartum period as evidenced in depressive disorder. Methods a cross sectional study was used to determine the prevalence and risk factors associated with depression among pregnant women attending antenatal clinic (ANC) at Bugando Medical Centre (BMC), a tertiary level hospital in Mwanza Tanzania. A total of 380 pregnant women were recruited and interviewed by using Edinburg Postnatal Depression Scale. The sample size was randomly selected from the clinic. Results the mean age of the participants was 30.35 years, with minimum and maximum age of 20 years and 47 years respectively with 89.74% of the participants being married. Almost half of the participants, 53.68% were on the third trimester, with about two-third of the participants, 76.84% reports to have planned for their current pregnancies. The overall prevalence of depression was 15% with middle age of the partner (31-40 years), been married, high level of education, partner and family support were found to be statistically protective for depression while polygamy and partner violence were statistically risk factor for depression. Conclusion the results showed high prevalence of antepartum depression which emphasizes the importance of earlier screening, detection and intervention to reduce the burden of morbidity and disability.
Numerische Untersuchungen zur Stabilität nicht-vorgemischter, doppelt-verdrallter Flammen

Die Stabilitat nicht-vorgemischter, doppelt-verdrallter Flammen wurde in der vorliegenden Arbeit mittels numerischer Methoden am Beispiel eines Gasturbinen-Modellbrenners untersucht. Die Ergebnisse der Simulationen erlauben es, den Mechanismus der Stabilisierung abzuleiten, und zeigen, dass die uberlegene Zundstabilitat der Gegendrallflamme aus einem wesentlich inhomogeneren Mischungsfeld mit einer stark vergroserten Zone nahestochiometrischer Gemischzusammensetzungen resultiert.
Anti- Forensics: The Tampering of Videos

In the context of forensic investigations, the traditional understanding of evidence is changing nowadays where most prosecutors, lawyers and judges heavily rely on multimedia substantiations. However, the evolution of easy-to-use media manipulating tools, made it very easy for almost any (technical) person to alter the content of a digital media (e.g. digital image, audio or video) without leaving any traces that can be detectable by human's basic perceptions. Therefore, the validity of the digital media can no longer be guaranteed which in turn leads to a serious problem regarding digital crime investigation. As there are tools which can tamper media, there are also ones that can do the reverse: detect the tampering. This paper sheds the light on the available anti-forensics tools. Experiments were done using some of these tools to detect tampered media – more specifically video tampering. Our experiments showed the efficiency of these tools by differentiating between original and altered evidences.
An Active Leakage Canceller Adopting Switched-Capacitor Digital Power Amplifier for UHF-RFID Transceiver

A low-noise active leakage canceller (ALC) for radio frequency identification (RFID) transceiver is reported. The proposed ALC suppresses the strong transmitter (TX) leakage at the receiver (RX) input through continuous leakage tracking by employing an I/Q harmonic rejection switched-capacitor digital power amplifier (I/Q HR SC DPA). Compared to the analog feedback loop-based ALC, the proposed ALC minimizes the noise figure (NF) degradation in the RX and eliminates the large-size passive components in the analog low pass filter, which leads to high RX sensitivity and small chip area. Implemented in a 55-nm CMOS, the proposed ALC suppresses −10 dBm TX leakage down to −47.2 dBm while degrading the RX NF by 0.4 dB at the offset frequency of 640 kHz.
Comparison of phenolic and chromatic characteristics of dry red wines made from native Chinese grape species and vitis vinifera

ABSTRACT The phenolic and chromatic characteristics of dry red wines made from native Chinese species (Vitis amurensis and its hybrids, and V. davidii) and V. vinifera were evaluated by high-performance liquid chromatography/triple-quadrupole tandem mass spectrometry and spectrophotometer, respectively. V. amurensis and its hybrids wines had higher phenolic percentage of non-coumaroylated 3, 5-O-diglucosidic anthocyanins, V. davidii wines had higher phenolic percentage of coumaroylated 3, 5-O-diglucosidic anthocyanins, kaempferol-3-O-glucoside, and quercetin-3-O-rhamnoside, V. vinifera wines had higher phenolic percentage offlavan-3-ols and 3-O-monoglucosidic anthocyanins. Wines of native Chinese species had relatively higher blue % value and lower red % value. By the use of principal component analysis and Pearson correlation analysis, specific phenolic compounds could be recognized as phenolic fingerprints of different wines, which not only play an important role in wine differentiation, but also explain their chromatic differences.
Studying spatio-energetic dynamics in light harvesting complex II using two-dimensional electronic-vibrational spectroscopy

We present two-dimensional electronic-vibrational spectra of the chlorophyll (Chl) binding protein light harvesting complex II (LHCII) from spinach, and of isolated Chl a and Chl b. We show how energy transfer from Chl b to Chl a and subsequent relaxation can be directly observed in LHCII using this multidimensional technique.
Monitoring apoptosis of TK-GFP-expressing ACC-M cells induced by ACV using FRET technique

Apoptosis is an evolutionary conserved cellular process that plays an important role during development, but it is also involved in tissue homeostasis and in many diseases. To study the characteristics of suicide gene system of the herpes simplex virus thymidine kinase (HSV-tk) gene in tumor cells and explore the apoptosis phenomena in this system and its effect on the human adenoid cystic carcinoma line ACC-M cell, we detected apoptosis of CD3- (ECFP-CRS-DsRed) and TK-GFP-expressing ACC-M (ACC-M-TK-GFP-CD3) cells induced by acyclovir (ACV) using fluorescence resonance energy transfer (FRET) technique. CD3 is a FRET-based indicator for activity of caspase-3, which is composed of an enhanced cyan fluorescent protein, a caspase-3 sensitive linker, and a red fluorescent protein from Discosoma with efficient maturation property. FRET from ECFP to DsRed could be detected in normal ACC-M-TK-GFP-CD3 cells, and the FRET efficient was remarkably decreased and then disappeared during the cells apoptosis induced by ACV. It was due to the activated caspase-3 cleaved the CD3 fusion protein. In this study, the results suggested that the AVC-induced apoptosis of ACC-M-TK-GFP-CD3 cells was through caspase-3 pathway.
Intersubjective principle of innovative development of regions management

Sustainable development of regions should ultimately lead to the renewal and expansion of consumer goods. Their quality influence the growth of living standard. In modern society, the main emphasis is placed on the emergence of innovations in the production process. In this regard, innovative development is seen as a means to make profit. At the same time, the connection with the broad interests of consumers is lost. Attention is turned to the increasing of the ability of goods to perform the purpose they were created for. Comprehensive formulation of tasks for business on the part of consumers should become the primary source for the goods design and the direction of technological development of production. In this regard, a new understanding of innovative idea as a result of the joint resolution of a problem situation by actors who are aware of themselves within the problem situation is proposed. The formation of territorial consumer cooperatives of the new type as a means of realizing a subject-oriented approach to innovative development is proposed.
A scientometric review of research on traffic forecasting in transportation

Research on trafﬁc forecasting in transportation has received worldwide concern over the past three decades. While there are comprehensive review studies on trafﬁc forecasting, few of them explore the research advancement in this ﬁeld from a visual perspective. With the help of CiteSpace and VOSviewer, this study uses scientometric review to identify the evolution and emerging trends of the research in the ﬁeld. Totally, 1536 bibliographic records with references are extracted from Web of Science and used as the datasets to form the author network, institutional network, keyword network, and co-citation network. The visualization of the results characterizes the research progress in the ﬁeld. It can be found that Eleni I. Vlahogianni receives the highest citation frequency, China and the United States contribute most of the journal articles. Some inﬂuential institutions and articles are also identiﬁed. With the author keyword network, the words “recurrent neural network”, “convolutional neural network”, “spatio-temporal correlation”, “trafﬁc pattern”, and “feature selection” are identiﬁed as the emerging trends. Also, the document citation bursts reveal that the applications of combined models and the study of trafﬁc ﬂow forecasting in atypical situations are becoming the emerging trends. This study provides a valuable reference for the research community in this ﬁeld.
Exact solutions of the combined Hirota-LPD equation with variable coefficients

In this paper, we construct exact families of traveling wave (periodic wave, singular wave, singular periodic wave, singular-solitary wave and shock wave) solutions of a well-known equation of nonlinear PDE, the variable coefficients combined HirotaLakshmanan-Porsezian-Daniel (Hirota-LPD) equation with the fourth nonlinearity, which describes an important development, and application of soliton dispersion management experiment in nonlinear optics is considered, and as an achievement, a series of exact traveling wave solutions for the aforementioned equation is formally extracted. This nonlinear equation is solved by using the extended trial equation method (ETEM) and the improved tan(ϕ/2)-expansion method (ITEM). Meanwhile, the mechanical features of some families are explained through offering the physical descriptions. Analytical treatment to find the nonautonomous rogue waves are investigated for the combined Hirota-LPD equation.
Response of Betula luminifera leaf litter decomposition to simulated nitrogen deposition in the Rainy Area of West China

Aims Our objective was to determine the effect of simulated increased nitrogen (N) deposition on decomposi- tion of Betula luminifera leaf litter, under a high wet-nitrogen deposition background. Methods From January 2008 to February 2009, a field experiment of simulated N deposition was conducted in a B. luminifera plantation in the Rainy Area of West China. The levels of nitrogen deposition were control (CK), low, medium and high N (0, 5, 15 and 30 g N·m -2 ·a -1 , respectively). A field experiment using the litterbag method was conducted on the decomposition of leaf litter of B. luminifera. In the end of each month, NH4NO3 was added into N-treated plots. Important findings Despite the high background N deposition, there were significant effects of simulated in- creased N deposition on B. luminifera leaf litter. N treatments significantly slowed the decomposition of B. lumi- nifera leaf litter through inhibiting the decay of lignin and cellulose. The time of 95% mass loss (T95%) of B. lumi- nifera leaf litter was increased by 1.14-1.96 a from 2.65 a (T95% of CK) caused by simulated N deposition. Simu- lated N deposition significantly increased the remaining amount of carbon, N, phosphorus, potassium, and mag- nesium after one year of decomposition. However, calcium release rate was stimulated by simulated N deposition in all three N treatments. The initial chemical characteristics of litter determined the response direction of litter decomposition to simulated N deposition, as well as the nutrient release pattern during litter decomposition.
Stability analysis of connected vehicles with V2V communication and time delays: CTCR method via Bézout’s resultant

This paper is focused on the distributed control of connected vehicles via vehicle-to-vehicle (V2V) communication. A mixed predecessor following topology with a virtual leader under constant time headway policy is analysed in case of communication and input delays. The longitudinal dynamics of each vehicle in the platoon is represented by a third-order linear model. Unavoidable communication and input delays are introduced into the platoon structure which converts the characteristic equation of the system into a transcendental type. The stability regions of the system in delay space are obtained by utilizing the cluster treatment of characteristic root (CTCR) method in the case of single and multiple time delays. A new Bézout resultant matrix-based approach is proposed to determine the kernel and offspring hypersurfaces of the CTCR method. The determination of these kernel and offspring hypersurfaces becomes computational costly as the number of vehicles increases in the platoon due to the increasing degree of characteristic equation. However, the proposed method reduces the dimensions of the coefficient matrix which is created by using the characteristic equation. It is concluded that the proposed method confirms the internal stability of the connected vehicles with both generic information flow topologies and formation between vehicles under single and multiple time delays. Thereafter, a local string stability definition is proposed in terms of spacing errors. Sufficient conditions to obtain string stability under mixed predecessor following topology for the existence and nonexistence of time delay are given. Finally, several simulation studies with different scenarios are conducted to display the effectiveness of the proposed model and method for internal and string stabilities.
Ab-Initio Calculations on Borate Systems

This paper is part of an ongoing effort aimed at modeling the srtucture of liquid and vitreous B2O3 within a first-principles framework. Using density-functional theory, pseudoatomic orbitals basis sets and pseudopotentials, we carried out a series of calculations on known borate systems, namely boric acid B(OH)3 and the two polymorphic B2O3 crstals. The obtained results show that rather small basis sizes ccan compete with the much more expensive planewave ones. This paves the way for an efficient description of the disordered phases using ab-initio molecular dynamics simulations.
A New Passive Lossless Snubber

Galvanically isolated photovoltaic (PV) microinverters based on single-stage flyback topology have advantages: simplicity, better reliability, and low cost. But isolated flyback topology comes with voltage stresses on semiconductor switches caused by transformer leakage inductance. An improved regenerative snubber has been proposed to meet the ever-growing demand for higher efficiency of PV microinverters. The proposed topology is the inductor-capacitor-diode (LCD) snubber with flying capacitor modified to reduce circulating currents. Theoretical analysis reveals a number of advantages. Experimental results are presented to verify the performance.