bluuebunny/crossref_metadata_2025 huggingface dataset:
CLOUD STORAGE FACILITY AS A FLUID QUEUE CONTROLLED BY MARKOVIAN QUEUE
Authors: El-Baz A. H. , Tarabia A. M. K. , Darwiesh A. M.
Published: December 2020

Cloud storage faces many problems in the storage process which badly affect the system's efficiency. One of the most problems is insufficient buffer space in cloud storage. This means that the packets of data wait to have storage service which may lead to weakness in performance evaluation of the system. The storage process is considered a stochastic process in which we can determine the probability distribution of the buffer occupancy and the buffer content and predict the performance behavior of the system at any time. This paper modulates a cloud storage facility as a fluid queue controlled by Markovian queue. This queue has infinite buffer capacity which determined by the M/M/1/N queue with constant arrival and service rates. We obtain the analytical solution of the distribution of the buffer occupancy. Moreover, several performance measures and numerical results are given which illustrate the effectiveness of the proposed model.
Parents’ early representations of their children moderate socialization processes: Evidence from two studies
Authors: An Danming , Kochanska Grazyna
Published: December 2020

Difficult infants are commonly considered at risk for maladaptive developmental cascades, but evidence is mixed, prompting efforts to elucidate moderators of effects of difficulty. We examined features of parents’ representations of their infants – adaptive (appropriate mind-mindedness, MM) and dysfunctional (low reflective functioning, RF, hostile attributions) – as potential moderators. In Family Study (N = 102), we tested parents’ appropriate MM comments to their infants as moderating a path from infants’ observed difficulty (negative affect, unresponsiveness) to parents’ observed power assertion at ages 2–4.5 to children's observed and parent-rated (dis)regard for conduct rules at age 5.5. In father–child relationships, MM moderated that path: for fathers with low MM, the infants’ increasing difficulty was associated with fathers’ greater power assertion, which in turn was associated with children's more disregard for rules. The path was absent for fathers with average or high MM. In Children and Parents Study (N = 200), dysfunctional representations (low RF, hostile attributions) moderated the link between child objective difficulty, observed as anger in laboratory episodes, and difficulty as described by the parent. Reports of mothers with highly dysfunctional representations were unrelated to children's observed anger. Reports of mothers with average or low dysfunctional representations aligned with laboratory observations.
From Galilee Villages to the Mountains of Al-Sham: Local and Regional Musical Networks among Palestinian Arab Wedding Musicians in Northern Israel
Authors: WOOD ABIGAIL , ELIAS TAISEER , HAMMOUD LOAB , BALLAN JIRYIS MURKUS
Published: December 2020

Based on recent ethnographic work, we explore the ways in which transnational cosmopolitan music crosses, creates, and reinscribes borders as it is performed by Palestinian Arab wedding musicians in northern Israel. While Palestinian nationalism and the hard political borders between Israel and its neighbouring states frame immediate questions of identity and mobility, in describing their musical practices, musicians turn to a complex, interleaved series of geographies that highlight past and contemporary processes of musical flow. On one hand, they foreground the continuing relevance of the historic al-Sham region as an area of shared musical practice, identifying with the jabali (“mountain”) musical style of the elevated region that marks the borderlands between today’s Lebanon, Syria, and Israel. On the other hand, they embed this regional style within a series of micro- and macro-geographies, from detailed knowledge of the subtle differences in tempo and style between neighbouring Galilee villages to connections with the wider Arabic-speaking world via old and new media. While recent research on music in the Middle East has often foregrounded the role of music in constructing and reinforcing national identities, this research illustrates how transnational flows continue to shape the experience and imagination of musical borderlands in the region.
Predicting Solute Transport Through Green Stormwater Infrastructure With Unsteady Transit Time Distribution Theory
Authors: Parker E. A. , Grant S. B. , Cao Y. , Rippy M. A. , McGuire K. J. , Holden P. A. , Feraud M. , Avasarala S. , Liu H. , Hung W. C. , Rugh M. , Jay J. , Peng J. , Shao S. , Li D.
Published: December 2020

In this study, we explore the use of unsteady transit time distribution (TTD) theory to model solute transport in biofilters, a popular form of nature‐based or “green” storm water infrastructure (GSI). TTD theory has the potential to address many unresolved challenges associated with predicting pollutant fate and transport through these systems, including unsteadiness in the water balance (time‐varying inflows, outflows, and storage), unsteadiness in pollutant loading, time‐dependent reactions, and scale‐up to GSI networks and urban catchments. From a solution to the unsteady age conservation equation under uniform sampling, we derive an explicit expression for solute breakthrough during and after one or more storm events. The solution is calibrated and validated with breakthrough data from 17 simulated storms at a field‐scale biofilter test facility in Southern California, using bromide as a conservative tracer. TTD theory closely reproduces bromide breakthrough concentrations, provided that lateral exchange with the surrounding soil is accounted for. At any given time, according to theory, more than half of the water in storage is from the most recent storm, while the rest is a mixture of penultimate and earlier storms. Thus, key management endpoints, such as the pollutant treatment credit attributable to GSI, are likely to depend on the evolving age distribution of water stored and released by these systems.
CheckV assesses the quality and completeness of metagenome-assembled viral genomes
Authors: Nayfach Stephen , Camargo Antonio Pedro , Schulz Frederik , Eloe-Fadrosh Emiley , Roux Simon , Kyrpides Nikos C.
Published: December 2020

Millions of new viral sequences have been identified from metagenomes, but the quality and completeness of these sequences vary considerably. Here we present CheckV, an automated pipeline for identifying closed viral genomes, estimating the completeness of genome fragments and removing flanking host regions from integrated proviruses. CheckV estimates completeness by comparing sequences with a large database of complete viral genomes, including 76,262 identified from a systematic search of publicly available metagenomes, metatranscriptomes and metaviromes. After validation on mock datasets and comparison to existing methods, we applied CheckV to large and diverse collections of metagenome-assembled viral sequences, including IMG/VR and the Global Ocean Virome. This revealed 44,652 high-quality viral genomes (that is, >90% complete), although the vast majority of sequences were small fragments, which highlights the challenge of assembling viral genomes from short-read metagenomes. Additionally, we found that removal of host contamination substantially improved the accurate identification of auxiliary metabolic genes and interpretation of viral-encoded functions.
Laser excited super resolution thermal imaging for nondestructive inspection of internal defects
Authors: Ahmadi Samim , Lecompagnon Julien , Hirsch Philipp Daniel , Burgholzer Peter , Jung Peter , Caire Giuseppe , Ziegler Mathias
Published: December 2020

A photothermal super resolution technique is proposed for an improved inspection of internal defects. To evaluate the potential of the laser-based thermographic technique, an additively manufactured stainless steel specimen with closely spaced internal cavities is used. Four different experimental configurations in transmission, reflection, stepwise and continuous scanning are investigated. The applied image post-processing method is based on compressed sensing and makes use of the block sparsity from multiple measurement events. This concerted approach of experimental measurement strategy and numerical optimization enables the resolution of internal defects and outperforms conventional thermographic inspection techniques.
The COVID-19 pandemic masks the way people perceive faces
Authors: Freud Erez , Stajduhar Andreja , Rosenbaum R. Shayna , Avidan Galia , Ganel Tzvi
Published: December 2020

The unprecedented efforts to minimize the effects of the COVID-19 pandemic introduce a new arena for human face recognition in which faces are partially occluded with masks. Here, we tested the extent to which face masks change the way faces are perceived. To this end, we evaluated face processing abilities for masked and unmasked faces in a large online sample of adult observers (n = 496) using an adapted version of the Cambridge Face Memory Test, a validated measure of face perception abilities in humans. As expected, a substantial decrease in performance was found for masked faces. Importantly, the inclusion of masks also led to a qualitative change in the way masked faces are perceived. In particular, holistic processing, the hallmark of face perception, was disrupted for faces with masks, as suggested by a reduced inversion effect. Similar changes were found whether masks were included during the study or the test phases of the experiment. Together, we provide novel evidence for quantitative and qualitative alterations in the processing of masked faces that could have significant effects on daily activities and social interactions.
Coefficient of variation as an image-intensity metric for cytoskeleton bundling
Authors: Higaki Takumi , Akita Kae , Katoh Kaoru
Published: December 2020

The evaluation of cytoskeletal bundling is a fundamental experimental method in the field of cell biology. Although the skewness of the pixel intensity distribution derived from fluorescently-labeled cytoskeletons has been widely used as a metric to evaluate the degree of bundling in digital microscopy images, its versatility has not been fully validated. Here, we applied the coefficient of variation (CV) of intensity values as an alternative metric, and compared its performance with skewness. In synthetic images representing extremely bundled conditions, the CV successfully detected degrees of bundling that could not be distinguished by skewness. On actual microscopy images, CV was better than skewness, especially on variable-angle epifluorescence microscopic images or stimulated emission depletion and confocal microscopy images of very small areas of around 1 μm2. When blur or noise was added to synthetic images, CV was found to be robust to blur but deleteriously affected by noise, whereas skewness was robust to noise but deleteriously affected by blur. For confocal images, CV and skewness showed similar sensitivity to noise, possibly because optical blurring is often present in microscopy images. Therefore, in practical use with actual microscopy images, CV may be more appropriate than skewness, unless the image is extremely noisy.
A ratiometric nanoprobe based on carboxylated graphitic carbon nitride nanosheets and Eu3+ for the detection of tetracyclines
Authors: Ti Mengru , Li Yasi , Li Zhongqiu , Zhao Dongxu , Wu Li , Yuan Longfei , He Yujian
Published: December 2020

A convenient and rapid method that combines a fluorescent nanoprobe based on C-g-C3N4-Eu3+ with a smartphone and test paper has been developed for the in situ detection of tetracyclines.
Determination of 38 pharmaceuticals and personal care products in water by lyophilization combined with liquid chromatography-tandem mass spectrometry
Authors: Zhang Yiqing , Lin Lifeng , Li Yan , Zeng Qiaoting , Guo Shanshan , Nkinahamira François , Yu Chang-Ping , Sun Qian
Published: December 2020

A low-cost and convenient method for 38 PPCP detections in water samples was developed by lyophilization combined with LC-MS/MS.
Efficient unified synthesis of diverse bridged polycyclic scaffolds using a complexity-generating ‘stitching’ annulation approach
Authors: Rice Scott , Cox Daniel J. , Marsden Stephen P. , Nelson Adam
Published: December 2020

Regioselective and stereospecific directed C–H arylation of simple amine substrates, and cyclisation, delivered 30 diverse, three-dimensional scaffolds.
An ultra-stable hafnium phosphonate MOF platform for comparing the proton conductivity of various guest molecules/ions
Authors: Huang Yan , Zhou Fan , Feng Jianshen , Zhao Hongxia , Qi Chao , Ji Jinyan , Bao Songsong , Zheng Tao
Published: December 2020

An ultra-stable PHOS-100(Hf) is reported as an ideal MOF platform for proton conductivity test loading with various guest molecules/ions, as it has excellent chemical and thermal stability.
Photoinduced defect engineering: enhanced photocatalytic performance of 3D BiOCl nanoclusters with abundant oxygen vacancies
Authors: Shen Qi , Wang Junnuan , Xu Bo , Liu Guangning , Huo Huanyu , Sun Yiqiang , Cao Bingqiang , Li Cuncheng
Published: December 2020

Oxygen vacancies are highly important for photocatalytic performance in bismuth oxychloride, but their preparation is limited to vacuum roasting and hydrogen annealing techniques at high temperatures (200–400 °C).
Morphological characterization and electronic properties of pristine and oxygen-exposed graphene nanoribbons on Ag(110)
Authors: Barcelon Jose Eduardo , Smerieri Marco , Carraro Giovanni , Wojciechowski Pawel , Vattuone Luca , Rocca Mario , Nappini Silvia , Píš Igor , Magnano Elena , Bondino Federica , Vaghi Luca , Papagni Antonio , Savio Letizia
Published: December 2020

Graphene nanoribbons (GNRs) are at the frontier of research on graphene materials since the 1D quantum confinement of electrons allows for the opening of an energy gap.
A pair potential modeling study of F3− in neon matrices
Authors: Bader Frederik , Tremblay Jean Christophe , Paulus Beate
Published: December 2020

First-principles investigations of the trifluoride anion in a neon environment reveal a small blue-shift of the fundamental vibrational excitations.
Hidden complexity in membrane permeabilization behavior of antimicrobial polycations
Authors: Shi Shuai , Quarta Ndjali , Zhang Haodong , Lu Ziyi , Hof Martin , Šachl Radek , Liu Runhui , Hoernke Maria
Published: December 2020

There are diverse membrane permeabilization behaviors of antimicrobial polycations in zwitterionic or charged vesicles; different mechanisms may occur over time.
Carbon materials for ion-intercalation involved rechargeable battery technologies
Authors: Wang Gang , Yu Minghao , Feng Xinliang
Published: December 2020

The development of carbon electrode materials for rechargeable batteries is reviewed from the perspective of structural features, electrochemistry, and devices.
Kinetic and spectroscopic insights into the behaviour of Cu active site for NH3-SCR over zeolites with several topologies
Authors: Ohata Yusuke , Kubota Hiroe , Toyao Takashi , Shimizu Ken-ichi , Ohnishi Takeshi , Moteki Takahiko , Ogura Masaru
Published: December 2020

Zeolite topology has a great effect on the dependence of NH3-SCR rates over Cu–zeolites at 473 K on Cu density. It is revealed by the time-resolved UV-vis measurements that zeolites mainly affect the oxidation property of Cu ion by O2.
Fouling is the beginning: upcycling biopolymer-fouled substrates for fabricating high-permeance thin-film composite polyamide membranes
Authors: Dai Ruobin , Han Hongyi , Wang Tianlin , Li Jiayi , Tang Chuyang Y. , Wang Zhiwei
Published: December 2020

Upcycling fouled microfiltration membranes for fabricating new high-pressure polyamide (PA) thin-film composite membranesviainterfacial polymerization (IP) is developed.
Synthesis of hierarchical porous Prussian blue analogues in partially miscible ionic liquid/ethanol solution near the phase boundary
Authors: Song Zongren , Ma Xiaoxue , Kang Xinchen , Wu Yang , He Zhenhong , Fang Dawei
Published: December 2020

Hierarchical porous PBAs with excellent catalytic performance were controllably synthesized in a partially miscible IL/ethanol system.
Catalytic transfer hydrogenation of furfural to furfuryl alcohol using easy-to-separate core–shell magnetic zirconium hydroxide
Authors: Hou Pan , Ma Mingwei , Zhang Peng , Cao Jingjie , Liu Hui , Xu Xingliang , Yue Huijuan , Tian Ge , Feng Shouhua
Published: December 2020

A core–shell magnetic catalyst is applied for the hydrogenation of furfural and other carbonyl compounds using isopropanol as H-donor.
Copolymerization of urea and murexide for efficient photocatalytic hydrogen evolution and tetracycline degradation
Authors: Du Zhilu , Zhao Xinyu , Zhao Yingnan , Sun Huiying , Li Yingqi , Wang Xin , Qiu Tianyu , Zhao Xia , Song Tingting , Tan Huaqiao
Published: December 2020

A g-C3N4 based material modified with murexide has been prepared and used for photocatalytic hydrogen production and degradation of tetracycline.
A CHA-based DNA stochastic walker that traverses on cell membranes
Authors: Hu Yanlei , Chu Xia
Published: December 2020

Here, we introduce a catalytic hairpin assembly (CHA)-based DNA walker on cell membranes. Driven by DNA strand exchange, catalytic strands move on cell membranes and hairpin strands (H2) in the solution are loaded on cells.
Facile fabrication of self-reporting micellar and vesicular structures based on an etching-ion exchange strategy of photonic composite spheres of poly(ionic liquid)
Authors: Gao Ning , Zhou Kang , Feng Kai , Zhang Wanlin , Cui Jiecheng , Wang Peng , Tian Li , Jenkinson-Finch Mary , Li Guangtao
Published: December 2020

Micellar and vesicular photonic compartments capable of reporting the chemical environment as well as introducing user-defined functionalities were successfully constructed.
Structural complexity induced by {110} blocking of cysteine in electrochemical copper deposition on silver nanocubes
Authors: Oh Hyuncheol , Hwang Hyunsik , Song Hyunjoon
Published: December 2020

Structural complexity was induced by exclusive {110} blocking of cysteine molecules during electrochemical Cu deposition on Ag nanocubes, which was precisely analyzed by bothex situandin situspectroscopic techniques.
Role of substituents in the Hofmann–Löffler–Freytag reaction. A quantum-chemical case study on nicotine synthesis
Authors: Shkunnikova Sofia , Zipse Hendrik , Šakić Davor
Published: December 2020

The Hofmann–Löffler–Freytag (HLF) reaction can be successfully used to synthesize saturated heterocyclic nitrogen-containing nature-derived pharmaceuticals such as nicotine and its derivatives.
A colorimetric sensor array for the classification of biologically relevant tri-, di- and mono-phosphates
Authors: Zwicker Vincent E. , Sergeant Genevieve E. , New Elizabeth J. , Jolliffe Katrina A.
Published: December 2020

A cyclic tetrapeptide paired with six commercially available indicators provides a chemosensing array able to classify biological phosphate derivatives.
Synthesis and characterization of an α-Fe2O3/ZnTe heterostructure for photocatalytic degradation of Congo red, methyl orange and methylene blue
Authors: Khurram Rooha , Wang Zhan , Ehsan Muhammad Fahad , Peng Song , Shafiq Maryam , Khan Bushra
Published: December 2020

Effective generation and transportation of electron–hole pairs in the presence of light leads to efficient degradation of textile pollutants over an α-Fe2O3/ZnTe nanocomposite compared to the individual components.
Ionic transport kinetics and enhanced energy storage in the electrode/poly(N-vinyl imidazole) interface for micro-supercapacitors
Authors: Krishnan Karthik , Karuthapandi Selvakumar , Vijayaraghavan Saranyan
Published: December 2020

The ionic charge transport kinetics in the poly(N-vinylimidazole) and energy storage at the electrode/poly(N-vinylimidazole) interfaces have been systematically studied for high performance micro-supercapacitors.
Zirconium-based metal–organic framework gels for selective luminescence sensing
Authors: Sun Shujian , Wei Caifeng , Xiao Yali , Li Guangqin , Zhang Jianyong
Published: December 2020

Zr-based MOF nanomaterials are developed via a metal–organic gelation method for rapid and effective luminescence vapour-sensing.
An active and stable multifunctional catalyst with defective UiO-66 as a support for Pd over the continuous catalytic conversion of acetone and hydrogen
Authors: Hu Yingjie , Mei Yuxin , Lin Baining , Du Xuhong , Xu Fan , Xie Huasheng , Wang Kang , Zhou Yonghua
Published: December 2020

The one-pot synthesis of methyl isobutyl ketone (MIBK) and methyl isobutyl methanol (MIBC) from acetone and hydrogen is a typical cascade reaction comprised of aldol condensation-dehydration-hydrogenation.
Synthesis and structural characterization of CO2-soluble oxidizers [Bu4N]BrO3 and [Bu4N]ClO3 and their dissolution in cosolvent-modified CO2 for reservoir applications
Authors: Hull Katherine L. , Schipper Desmond E. , Oliver Allen G.
Published: December 2020

Bromate and chlorate salts were hydrophobically modified with tetrabutylammonium to yield oxidizers that are soluble in CO2-cosolvent mixtures.
Parasitic crystallization of colloidal electrolytes: growing a metastable crystal from the nucleus of a stable phase
Authors: Sanchez-Burgos Ignacio , Garaizar Adiran , Vega Carlos , Sanz Eduardo , Espinosa Jorge R.
Published: December 2020

Despite its lower stability and higher nucleation barrier, a metastable charge-disordered colloidal phase manages to parasitically crystallize from nuclei of the stable charge-ordered phase due to its enhanced kinetic crystal growth.
How a water drop removes a particle from a hydrophobic surface
Authors: Naga Abhinav , Kaltbeitzel Anke , Wong William S. Y. , Hauer Lukas , Butt Hans-Jürgen , Vollmer Doris
Published: December 2020

Possible outcomes when a particle collides with a water drop on a hydrophobic surface.
Waardenburg syndrome type II in a Chinese pedigree caused by frameshift mutation in the SOX10 gene
Authors: Li Li , Ma Jing , He Xiao-li , Zhou Yuan-tao , Zhang Yu , Chen Quan-dong , Zhang Lin , Ruan Biao , Zhang Tie-Song
Published: December 2020

Waardenburg syndrome (WS) is a congenital hereditary disease, attributed to the most common symptoms of sensorineural deafness and iris hypopigmentation. It is also known as the hearing-pigmentation deficient syndrome. Mutations on SOXl0 gene often lead to congenital deafness and has been shown to play an important role in the pathogenesis of WS. We investigated one family of five members, with four patients exhibiting the classic form of WS2, whose DNA samples were analyzed by the technique of Whole-exome sequencing (WES). From analysis of WES data, we found that both the mother and all three children in the family have a heterozygous mutation on the Sex Determining Region Y - Box 10 (SOX10) gene. The mutation was c.298_300delinsGG in exon 2 of SOX10 (NM_006941), which leads to a frameshift of nine nucleotides, hence the amino acids (p. S100Rfs*9) are altered and the protein translation may be terminated prematurely. Further flow cytometry confirmed significant down-regulation of SOX10 protein, which indicated the SOX10 gene mutation was responsible for the pathogenesis of WS2 patients. In addition, we speculated that some other mutated genes might be related to disease phenotype in this family, which might also participate in promoting the progression of WS2.
CXCL10 is a potential biomarker and associated with immune infiltration in human papillary thyroid cancer
Authors: Qin Xiao-Jing , Lin Xu , Xue Gang , Fan Hui-Li , Wang Hao-Yu , Wu Jing-Fang , Pei Da
Published: December 2020

Background: In recent years, the annual incidence of thyroid cancer (TC) has increased, with papillary thyroid cancer (PTC) identified as the most commonwinwordpathological type accounting for approximately 80% of all thyroid cancer cases. The tumor microenvironment is known to play a vital role in tumor information transmission and immune detection.

Methods: In the present study, we examined gene expression data from 518 patients with PTC. The ESTIMATE algorithm was used to calculate immune and stromal scores of PTC patients. Based on a protein–protein interaction (PPI) network, functional enrichment and overall survival analyses, C-X-C motif chemokine ligand 10 (CXCL10) was identified as a core gene. We further investigated the roles of core genes of PTC in the tumor immune microenvironment using LinkedOmics, GSEA, and TIMER tools.

Results: Immune, stromal and ESTIMATE scores were related to clinicopathological variables of patients with PTC, but not survival outcomes. Eight differentially expressed genes (DEGs) were associated with survival outcome. In addition, immunochemical staining experiments revealed lower expression of CXCL10 in PTC than paracancerous tissues. GSEA pathway enrichment analysis revealed downregulation of CXCL10 in multiple cancer pathways. CXCL10 and related genes were enriched in pathways related to adaptive immune response, cellular defense response and regulation of innate immune response.

Conclusion: The tumor microenvironment plays a critical role in development of PTC and CXCL10 may serve as a novel target of precision therapy for this patient population.
Hypertension and reproductive dysfunction: a possible role of inflammation and inflammation-associated lymphangiogenesis in gonads
Authors: Navaneethabalakrishnan Shobana , Goodlett Bethany L. , Lopez Alexandra H. , Rutkowski Joseph M. , Mitchell Brett M.
Published: December 2020

Hypertension is one of the most prevalent diseases that leads to end organ damage especially affecting the heart, kidney, brain, and eyes. Numerous studies have evaluated the association between hypertension and impaired sexual health, in both men and women. The detrimental effects of hypertension in men includes erectile dysfunction, decrease in semen volume, sperm count and motility, and abnormal sperm morphology. Similarly, hypertensive females exhibit decreased vaginal lubrication, reduced orgasm, and several complications in pregnancy leading to fetal and maternal morbidity and mortality. The adverse effect of hypertension on male and female fertility is attributed to hormonal imbalance and changes in the gonadal vasculature. However, mechanistic studies investigating the impact of hypertension on gonads in more detail on a molecular basis remain scarce. Hence, the aim of the current review is to address and summarize the effects of hypertension on reproductive health, and highlight the importance of research on the effects of hypertension on gonadal inflammation and lymphatics.
A binary‐coded symbols signal design method for ground‐based wireless navigation
Authors: Wang Yiwei , Huang Zhigang
Published: December 2020

Global navigation satellite system (GNSS) like signal has been widely used in ground‐based navigation as an augment of global navigation satellite system system. The binary‐coded symbols (BCS) spreading modulation has been successfully used in global navigation satellite system systems to pursue the frequency reuses, and it is proved to have better ranging performance if the potential ambiguity risk is avoided. In the paper, the BCS coding is designed for ground‐based transmitter with the comprehensive consideration of potential tracking accuracy, anti‐multipath performance and ambiguous acquisition probability. The binary‐coded symbol codes are obtained by optimising the corresponding performance with the condition of an acceptable false‐lock probability. In this way, a moderate performance tracking performance can be achieved when the designed binary‐coded symbol codes are adopted with the global navigation satellite system‐like signal. The performance of the proposed signal is analysed in theory and assessed by computer simulation, and the unambiguous two‐dimensional processing is given as an alternative for the proposed binary‐coded symbol signals. The result indicates the proposed binary‐coded symbol codes obtain obvious advantages over the traditional binary phase shift keying (BPSK) modulation and the existing binary‐coded symbol coding schemes when applied with ground‐based occasions.
Dynamic adaptive spectrum allocation in flexible grid optical network with multi‐path routing
Authors: Ujjwal Ujjwal , Mahala Neha , Thangaraj Jaisingh
Published: December 2020

Fragmentation is one of the major issues in elastic optical network (EON) due to its dynamic characteristics which may possibly degrade the spectrum efficiency. Several techniques have been presented in the literature to get the optimal solution of this problem while multi‐path provisioning comes out to be very compelling among them. In multi‐path provisioning enable networks, multi‐path routing and spectrum assignment (MPRSA) creates further complications due to the hardware availability and more spectrum consumption. This paper presents a novel technique termed as adaptive service provisioning (ASP) to come up with a solution of the MPRSA problem and it minimizes the spectrum fragments in the network by precisely managing the scattered spectrum slots. This technique performs the adaptive traffic demand splitting on disjoint paths in case it is unable to be served by k‐shortest routing paths based on the parameters such as hardware support, capacity available and demand. An integer linear programming (ILP) model as well as a heuristic algorithm for solving MPRSA problem in large optical networks where ILP is not compliant is developed. Numerical simulations are performed to investigate the performance of the algorithm in terms of blocking probability and spectrum utilization.
Wideband spectrum sensing based on modulated wideband converter with nested array
Authors: Li Qiuyue , Li Zhi , Li Jian
Published: December 2020

Several spectrum sensing systems based on sub‐Nyquist sampling have been extensively studied to deal with difficulties of traditional wideband spectrum sensing in cognitive radio (CR) networks. The modulated wideband converter (MWC) is an effective application and has drawn considerably more attention over the past few years. In this study, MWC with a nested array (NA) system is proposed to improve spectrum sensing performance, which is an array sensing system with sub‐Nyquist sampling. The simulations show that the connection of co‐array and MWC obtains the lower minimal system sampling rate than MWC. Second, the proposed system enables frequency and power spectrum estimation with sub‐Nyquist sampling for more sources than sensors. Finally, our alternative spectrum sensing system outperforms other conventional methods in terms of sensing accuracy and design complexity.
Deep learning‐based pilot‐assisted channel state estimator for OFDM systems
Authors: Essai Ali Mohamed Hassan
Published: December 2020

This study proposes an online deep learning‐based channel state estimator for OFDM wireless communication systems by employing the deep learning long short‐term memory (LSTM) neural networks. The proposed algorithm is a pilot‐assisted estimator type. The proposed estimator is initially offline trained using simulated data sets, and then it follows the channel statistics in an online deployment, where finally the transmitted data can be recovered. A comparative investigation is performed using three different optimisation algorithms for deep learning to evaluate the performance of the proposed estimator at each. The proposed estimator provides a superior performance in comparison to least square (LS) and minimum mean square error (MMSE) estimators when limited pilots are used, thanks to the outstanding learning and generalisation capabilities of deep learning LSTM neural networks. Also, it does not require any prior knowledge of channel statistics. So, the proposed estimator is promising for channel state estimation in OFDM communication systems.
Experimental validation of a three‐dimensional modulation format for data transmission in RGB visible light communication systems
Authors: Rios Jose L. Henao , González Neil Guerrero , Ribeiro Moisés R. N. , Silva Jair A. L.
Published: December 2020

Transmission of three‐dimensional (3D) orthogonal frequency division multiplexing (OFDM) signals over red, green and blue (RGB) visible light communication (VLC) systems is proposed and experimentally validated. The novel 3D modulation format aims to overcome the different luminous response of RGB light‐emitting diodes at the same driving current levels, that generates a correlation among the three RGB analog signals instead of considering each channel as independent from each other, as is in classical uniform wavelength division multiplexing transmissions. In the proposed scheme, real and imaginary parts of OFDM signals are sent through the red and blue channels of the VLC transmitter, respectively, while the third dimension of the OFDM symbol is transmitted through the green channel, according to a procedure that allows the maximisation of the Euclidean distance among the 3D constellation symbols. For the OFDM signal reconstruction and decoding at the receiver side, advanced digital signal processing for frame synchronisation and reconstruction of the 3D constellation diagram are implemented. Experimental results are included to validate the transmission of a 27.3 Mbps system through a VLC link of 1.5 m.
End‐to‐end delay optimisation for IEEE 802.11 string topology multi‐hop wireless networks in overhead transmission line system
Authors: Zhao Chanjuan , Sun Wei , Fang Zhao , Wang Jianping , Li Qiyue , Zhang Haiyan
Published: December 2020

The network sampling rate is important in the overhead transmission line monitoring system. A larger sampling rate can provide more available monitored data to be transmitted, which can effectively improve the response speed to emergency events of the overhead transmission line system. Considering the harsh environment of the overhead transmission line wireless network, quality‐of‐service (QoS) requirement becomes an important issue for multi‐hop transmission. Thus, in this paper, an end‐to‐end delay optimisation algorithm for string‐topology multi‐hop wireless network is proposed, by which the maximum packet arrival rate and the allowable maximum sampling rate of network can be obtained with desirable soft QoS guarantees. Based on the IEEE 802.11 standards and the basic probability theorem, a novel end‐to‐end delay performance analytical model is firstly proposed. Then, combined with the derived analytical model, an end‐to‐end delay optimisation algorithm by maximising the packet arrival rate is developed. Finally, a numerical study of a string‐topology multi‐hop network is presented to verify the effects of packet arrival rate, backoff contention window size, hop number, data packet size on the end‐to‐end delay performance.
Quantised control of delayed Markovian jump systems with partly known transition probabilities
Authors: Yang Ning , Chen Dongyan , Hu Jun
Published: December 2020

This paper is devoted to solve the quantised control problem of the continuous‐time uncertain Markovian jump systems with mixed time delays and partly known transition probabilities. For the Markov chain, the transition rates are assumed to be partly known. The involved mixed time delays comprise both time‐varying delays and distributed delays. The logarithmic quantiser is introduced in the design of the state feedback controller and the uncertainty is entered into the quantization error matrix represented by an interval matrix. Based on the generalised Itô's formula, the free‐connection weighting matrix method and the stochastic analysis theory, several novel sufficient conditions are derived to guarantee that the trivial solution of the closed‐loop system is robustly exponentially stable in the mean square. Then, the concrete expression form of the desired controller gain is obtained via the solutions to a set of linear matrix inequalities. In addition, the corresponding stability criteria are given for three special situations of Markovian jump systems. Finally, a numerical example and a practical example (the wheeled mobile manipulator) are provided to show the feasibility and availability of the proposed theoretical results.
Guaranteed cost stabilization control of discrete‐time switched systems
Authors: Du Shengli , Zhao Xudong , Qiao Junfei , Zong Guangdeng
Published: December 2020

This paper is concerned with the guaranteed cost control problem of a class of linear discrete‐time switched systems with parametric uncertainties. Both state‐based and dynamic output‐based robust stabilization problems are investigated by using mode‐dependent dwell time technique. Different from the existing results, here, the designed controllers are both mode‐dependent and quasi‐time‐dependent, which are less conservative. On the basis of the designed quasi‐time‐dependent Lyapunov functions, robust stabilization criteria are presented for the system under consideration. The solvable conditions are formulated as linear matrix inequalities, which are thus easy to be solved. Some comparative simulations are given to show the effectiveness of the proposed method.
Fixed‐time stabilisation of boundary controlled linear parabolic distributed parameter systems with space‐dependent reactivity
Authors: Bao Chunxia , Cui Baotong , Lou Xuyang , Wu Wei , Zhuang Bo
Published: December 2020

The problems of state feedback and output feedback for fixed‐time stabilisation of a linear parabolic distributed parameter system with space‐dependent reactivity are considered by means of continuous backstepping approach and Lyapunov method. First, the invertible Volterra integral transformation with time dependent gain kernel is adopted to convert the original system into a fixed‐time stable target system with time‐dependent coefficient. The well‐posedness of the resulting kernel equations is proved by the method of successive approximation. Then a state feedback controller is designed to guarantee fixed‐time stabilisation of the closed‐loop system. Moreover, a fixed‐time observer is considered to estimate the state of the original system on the basis of the measurement signal at the boundary. Based on this observer, a observer‐based output feedback controller is established to fixed‐time stabilise the closed‐loop system in a prescribed time by using separation principle. Finally, a numerical simulation is provided to verify the feasibility of the proposed theoretical results by using the modified Ablowitz‐Kruskal‐Ladik scheme.
STCC: A SDN‐oriented TCP congestion control mechanism for datacenter network
Authors: Tianfang Yu , Xuesong Qiu
Published: December 2020

Due to characteristics of high bandwidth and low latency, datacenter networks ensure tremendous data could be transmitted in an efficient way. However, in many‐to‐one transmission scenarios, high concurrency of TCP flows aggravates network congestion and causes overflows in switches, seriously impairing network performance. To solve the problem, a TCP congestion control mechanism based on software‐defined networking (STCC) is proposed. Without any modification in TCP stack, STCC monitors network performance through centralized control and global network view of SDN, employs a routing algorithm based on the minimum path bandwidth utilization rate to forward packets and uses different methods to adjust congestion windows of senders so that network congestion can be greatly mitigated. An experiment platform is built to carry out simulation tests for evaluating STCC, and the results show that under the same network conditions, STCC effectively reduces the number of retransmission timeout of senders and noticeably raises network throughput, compared with other congestion control algorithms.
Magnetic measurement of nanocrystalline alloy based on a single sheet tester
Authors: Zhang Xiwei , Li Lin , Zhang Yan , Pang Jian
Published: December 2020

Generally, for the measurement of magnetic characteristics of nanocrystalline alloy, the magnetic circuit length (lm) is assumed as a constant, and magnetic measurement under square waveform is rarely focused. This paper examines that magnetic characteristics of nanocrystalline alloy are measured under sinusoidal waveforms and square waveforms based on a single sheet tester. The factors related to lm are analysed from the tested data under sinusoidal excitations, and a novel method to determine lm is presented, which is then extended to the case under square waveforms. By combining with a power electronic inverter, the influence of power electronic topology on measurements is analysed, and the oscillation mechanism of excitation current of single sheet tester is revealed. As a result, the limitation of the H‐coil method for acquiring the magnetic field intensity H under square waveforms is pointed out, and improved magnetic circuit method is introduced. It is shown from experimental results that the proposed measurement system is useful for acquiring magnetisation characteristics of the nanocrystalline alloy.
Computer model of high-precision navigation of a small satellite constellation for remote Earth sensing tasks
Authors: Tutatchikov Valeriy , Drozd Oleg , Kapulin Denis
Published: December 2020

One of the key tasks in the formation of the small satellite constellation is to ensure its stable configuration in time. The specific of this problem lies in the fact that the task must be solved in real time with sufficiently high accuracy with significant restrictions on the power consumption of onboard satellite systems. The paper briefly discusses one possible approach of secondary signal processing and solving the navigation and ballistic tasks, which involves the joint use of code, phase measurement methods, integer phase ambiguity resolution, and inter-satellite measurements.
Adaptation to climate change in Kazakhstan using data from space monitoring of snowmelt
Authors: Zholdasbek Aknur , Kauazov Azamat
Published: December 2020

The present article is concerned with the applied aspects of applying the results of space monitoring of snow cover, in particular, it is proposed to present the results of the analysis in the form of specialized bulletins. The purpose of this publication is to present the available results of space monitoring of snow cover in Kazakhstan as an element of adaptation to climate change. A three-level system of space monitoring of snow cover is proposed, which includes three technological complexes: operational mapping of snow cover boundaries; monitoring of seasonal snow cover dynamics; analysis of long-term snow cover dynamics. A map of snow melting in Kazakhstan in 2020, the dynamics of long-term changes of snow covered area, as well as methods for analyzing the spatial- temporal distribution of snow cover and formats of special bulletins are presented. It is most appropriate to present the results of space monitoring of snow cover in a complex, maximally generalized form (product). The results of the work can be applied in the scientific, industrial and educational spheres to adapt and increase resistance.
Remote sensing data for assessing the equivalent water height (EWH) variety versus the level of forest disturbance in Central Siberia
Authors: Krasnoshchekov Konstantin , Dergunov Alexander , Ponomarev Evgenii
Published: December 2020

The forests of the permafrost zone of Central Siberia are influenced by natural and anthropogenic factors. Using remote sensing data, disturbed areas of forest cover are detected in the IR range as an anomalies of the surface temperature, which are significant for a long time (~20 years). Long-term changes in the temperature balance of the surface affect both the state of the lower soil horizons and the dynamics of the seasonally thawed layer, and, therefore, can affect the variation in the water balance and groundwater runoff. For the area of interest, a trend is shown of ~20% increase in the total area of disturbances per last two decades. A correlation analysis between large-scale thermal anomalies of the underlying surface and the series of gravimetric data on Equivalent Water Height (EWH) parameter is performed for the territory of the two river basins of the Nizhnyaya Tunguska and Podkamennaya Tunguska (Central Siberia). As a first approximation we estimated the relationship between the forest and on-ground cover disturbance and thermal anomalies of the underlying surface, which affect the seasonal dynamics of groundwater.
Comparison of different models for assessing air quality in Krasnoyarsk using satellite data
Authors: Krasnoshchekov Konstantin , Yakubailik Oleg
Published: December 2020

Methods for estimating the atmospheric pollution of Krasnoyarsk by particulate matter based on satellite data on the aerosol optical depth (AOD) are considered. Satellite data from the MODIS MAIAC algorithm with a spatial resolution of 1 km are used together with data from the ground-based PM2.5 environmental monitoring stations of the FRC KSC SB RAS research network. A comparative analysis of the relationship between the calculated values of PM2.5 obtained from AOD data and ground- based measurements of PM2.5 in the summer of 2019 is presented. Various models of the relationship between these parameters were investigated, and a high level of correlation of these values was obtained. The calculated coefficient of determination was about 0.7.
Haine et cruauté dans la relation transféro-contre-transférentielle
Authors: Jean-Dit-Pannel Romuald , Thomas François
Published: December 2020

La relation transféro-contre-transférentielle, véritable outil de travail du caregiver, du soignant, du psychiste, convie à penser la haine et la cruauté. Entre cruauté et tendresse, quelles capacités de re-co-naissances intrapsychiques et intersubjectives le soignant possède-t-il en lui afin de (re)considérer un soigné qui est lui dans un état de dépendance absolue et qui survit somatiquement et psychiquement ?

La cruauté au sein d’une clinique extrême, celle de la clinique de l’insuffisance rénale chronique, est ici précisée, illustrée. Le soigné, pleinement, et le caregiver, à moindre mesure, sont pris, réellement et fantasmatiquement, entre une cruauté hématophile, conséquente de l’oralité vampirique en hémodialyse, et une cruauté anthropophage, issue de l’oralité cannibalique dans la clinique de la greffe rénale.

Une rencontre clinique avec une insuffisante rénale transplantée et les pensées paradoxales qu’elle a fait naître chez l’un d’entre nous affinera notre propos.

Nous discuterons d’une cruauté constituante pour conclure sur le besoin chez tout soignant de penser la haine et la cruauté. Pour nous, cela permet d’être au service de la relation de soin, donc des intrications somatopsychiques, de s’en dégager pour ne pas agir, notamment par retournements actif/passif, cette haine et cette cruauté dans les soins (enjeux de bientraitance/maltraitance ou plutôt de bienveillance/malveillance dans les soins).