bluuebunny/crossref_metadata_2025 huggingface dataset:
Striatal dopaminergic alterations in individuals with copy number variants at the 22q11.2 genetic locus and their implications for psychosis risk: a [18F]-DOPA PET study
Authors: Rogdaki Maria , Devroye Céline , Ciampoli Mariasole , Veronese Mattia , Ashok Abhishekh H. , McCutcheon Robert A. , Jauhar Sameer , Bonoldi Ilaria , Gudbrandsen Maria , Daly Eileen , van Amelsvoort Therese , Van Den Bree Marianne , Owen Michael J. , Turkheimer Federico , Papaleo Francesco , Howes Oliver D.
Published: May 2021

Dopaminergic dysregulation is one of the leading hypotheses for the pathoetiology underlying psychotic disorders such as schizophrenia. Molecular imaging studies have shown increased striatal dopamine synthesis capacity (DSC) in schizophrenia and people in the prodrome of psychosis. However, it is unclear if genetic risk for psychosis is associated with altered DSC. To investigate this, we recruited healthy controls and two antipsychotic naive groups of individuals with copy number variants, one with a genetic deletion at chromosome 22q11.2, and the other with a duplication at the same locus, who are at increased and decreased risk for psychosis, respectively. Fifty-nine individuals (21 with 22q11.2 deletion, 12 with the reciprocal duplication and 26 healthy controls) received clinical measures and [18F]-DOPA PET imaging to index striatal Kicer. There was an inverse linear effect of copy number variant number on striatal Kicer value (B = −1.2 × 10−3, SE = 2 × 10−4, p < 0.001), with controls showing levels intermediate between the two variant groups. Striatal Kicer was significantly higher in the 22q11.2 deletion group compared to the healthy control (p < 0.001, Cohen’s d = 1.44) and 22q11.2 duplication (p < 0.001, Cohen’s d = 2) groups. Moreover, Kicer was positively correlated with the severity of psychosis-risk symptoms (B = 730.5, SE = 310.2, p < 0.05) and increased over time in the subject who went on to develop psychosis, but was not associated with anxiety or depressive symptoms. Our findings suggest that genetic risk for psychosis is associated with dopaminergic dysfunction and identify dopamine synthesis as a potential target for treatment or prevention of psychosis in 22q11.2 deletion carriers.
Loss of CEP70 function affects acrosome biogenesis and flagella formation during spermiogenesis
Authors: Liu Qiang , Guo Qianying , Guo Wei , Song Shi , Wang Nan , Chen Xi , Sun Andi , Yan Liying , Qiao Jie
Published: May 2021

The spermatogenesis process is complex and delicate, and any error in a step may cause spermatogenesis arrest and even male infertility. According to our previous transcriptomic data,CEP70is highly expressed throughout various stages of human spermatogenesis, especially during the meiosis and deformation stages. CEP70 is present in sperm tails and that it exists in centrosomes as revealed by human centrosome proteomics. However, the specific mechanism of this protein in spermatogenesis is still unknown. In this study, we found a heterozygous site of the same mutation onCEP70through mutation screening of patients with clinical azoospermia. To further verify, we deleted CEP70 in mice and found that it caused abnormal spermatogenesis, leading to male sterility. We found that the knockout of CEP70 did not affect the prophase of meiosis I, but led to male germ-cell apoptosis and abnormal spermiogenesis. By transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analysis, we found that the deletion of CEP70 resulted in the abnormal formation of flagella and acrosomes during spermiogenesis. Tandem mass tag (TMT)-labeled quantitative proteomic analysis revealed that the absence of CEP70 led to a significant decrease in the proteins associated with the formation of the flagella, head, and acrosome of sperm, and the microtubule cytoskeleton. Taken together, our results show that CEP70 is essential for acrosome biogenesis and flagella formation during spermiogenesis.
The genome of Nautilus pompilius illuminates eye evolution and biomineralization
Authors: Zhang Yang , Mao Fan , Mu Huawei , Huang Minwei , Bao Yongbo , Wang Lili , Wong Nai-Kei , Xiao Shu , Dai He , Xiang Zhiming , Ma Mingli , Xiong Yuanyan , Zhang Ziwei , Zhang Lvping , Song Xiaoyuan , Wang Fan , Mu Xiyu , Li Jun , Ma Haitao , Zhang Yuehuan , Zheng Hongkun , Simakov Oleg , Yu Ziniu
Published: May 2021

Nautilus is the sole surviving externally shelled cephalopod from the Palaeozoic. It is unique within cephalopod genealogy and critical to understanding the evolutionary novelties of cephalopods. Here, we present a complete Nautilus pompilius genome as a fundamental genomic reference on cephalopod innovations, such as the pinhole eye and biomineralization. Nautilus shows a compact, minimalist genome with few encoding genes and slow evolutionary rates in both non-coding and coding regions among known cephalopods. Importantly, multiple genomic innovations including gene losses, independent contraction and expansion of specific gene families and their associated regulatory networks likely moulded the evolution of the nautilus pinhole eye. The conserved molluscan biomineralization toolkit and lineage-specific repetitive low-complexity domains are essential to the construction of the nautilus shell. The nautilus genome constitutes a valuable resource for reconstructing the evolutionary scenarios and genomic innovations that shape the extant cephalopods.
Real-world rogue wave probabilities
Authors: Häfner Dion , Gemmrich Johannes , Jochum Markus
Published: May 2021

Rogue waves are dangerous ocean waves at least twice as high as the surrounding waves. Despite an abundance of studies conducting simulations or wave tank experiments, there is so far no reliable forecast for them. In this study, we use data mining and interpretable machine learning to analyze large amounts of observational data instead (more than 1 billion waves). This reveals how rogue wave occurrence depends on the sea state. We find that traditionally favored parameters such as surface elevation kurtosis, steepness, and Benjamin–Feir index are weak predictors for real-world rogue wave risk. In the studied regime, kurtosis is only informative within a single wave group, and is not useful for forecasting. Instead, crest-trough correlation is the dominating parameter in all studied conditions, water depths, and locations, explaining about a factor of 10 in rogue wave risk variation. For rogue crests, where bandwidth effects are unimportant, we find that skewness, steepness, and Ursell number are the strongest predictors, in line with second-order theory. Our results suggest that linear superposition in bandwidth-limited seas is the main pathway to “everyday” rogue waves, with nonlinear contributions providing a minor correction. This casts some doubt whether the common rogue wave definition as any wave exceeding a certain height threshold is meaningful in practice.
Radiation-free interlocking intramedullary nailing of three-hundred and seventy long bone fractures in Ogbomoso, Nigeria
Authors: Adesina Stephen Adesope , Eyesan Samuel Uwale , Ikem Innocent Chiedu , Anipole Olalekan Akeem , Amole Isaac Olusayo , Akinwumi Akinsola Idowu , Bamigboye Philip Oluyemi , Durodola Adewumi Ojeniyi
Published: May 2021

Long bone fracture care in developing countries remains largely different from that of the developed world where closed reduction and internal fixation with locked intramedullary nail is the standard treatment. This study in a developing country presents the pattern and outcome of treatment of 370 long bone fractures using the SIGN nail over a five-year period in order to underline the wide array of patients and fractures treatable with the nail. Using a prospective descriptive approach, all the 342 patients with 370 fractures of the humerus, femur and tibia treated from July 2014 to June 2019 were studied. The fractures were reduced without image intensifier or fracture table and fixed with the SIGN nail. Post-discharge, the patients were followed up at the out-patient clinic. The mean age of the patients was 43.45 years with a range of 10–99 years. Sixty-six percent were males who were mostly injured in motorcycle accidents. Femur, tibia and humerus fractures accounted for 59.7%, 28.4% and 11.9% respectively. Eighty-six percent were diaphyseal fractures, 73% were fresh and the main previous treatment was traditional bone setting. Deep infection occurred in 4.9%, 66.0% achieved knee flexion > 90° by sixth week, the majority achieved full weight bearing and could squat and smile by 12th week. The SIGN nail is versatile, useful for treating a wide range of fractures in most age groups particularly in developing countries where orthopaedic fractures are prevalent but the more sophisticated facilities are lacking or poorly maintained.
A synthetic RNA editing factor edits its target site in chloroplasts and bacteria
Authors: Royan Santana , Gutmann Bernard , Colas des Francs-Small Catherine , Honkanen Suvi , Schmidberger Jason , Soet Ashley , Sun Yueming Kelly , Vincis Pereira Sanglard Lilian , Bond Charles S. , Small Ian
Published: May 2021

Members of the pentatricopeptide repeat (PPR) protein family act as specificity factors in C-to-U RNA editing. The expansion of the PPR superfamily in plants provides the sequence variation required for design of consensus-based RNA-binding proteins. We used this approach to design a synthetic RNA editing factor to target one of the sites in the Arabidopsis chloroplast transcriptome recognised by the natural editing factor CHLOROPLAST BIOGENESIS 19 (CLB19). We show that our synthetic editing factor specifically recognises the target sequence in in vitro binding assays. The designed factor is equally specific for the target rpoA site when expressed in chloroplasts and in the bacterium E. coli. This study serves as a successful pilot into the design and application of programmable RNA editing factors based on plant PPR proteins.
Mechanistic insights into synergy between nalidixic acid and tetracycline against clinical isolates of Acinetobacter baumannii and Escherichia coli
Authors: Gaurav Amit , Gupta Varsha , Shrivastava Sandeep K. , Pathania Ranjana
Published: May 2021

The increasing prevalence of antimicrobial resistance has become a global health problem. Acinetobacter baumannii is an important nosocomial pathogen due to its capacity to persist in the hospital environment. It has a high mortality rate and few treatment options. Antibiotic combinations can help to fight multi-drug resistant (MDR) bacterial infections, but they are rarely used in the clinics and mostly unexplored. The interaction between bacteriostatic and bactericidal antibiotics are mostly reported as antagonism based on the results obtained in the susceptible model laboratory strain Escherichia coli. However, in the present study, we report a synergistic interaction between nalidixic acid and tetracycline against clinical multi-drug resistant A. baumannii and E. coli. Here we provide mechanistic insight into this dichotomy. The synergistic combination was studied by checkerboard assay and time-kill curve analysis. We also elucidate the mechanism behind this synergy using several techniques such as fluorescence spectroscopy, flow cytometry, fluorescence microscopy, morphometric analysis, and real-time polymerase chain reaction. Nalidixic acid and tetracycline combination displayed synergy against most of the MDR clinical isolates of A. baumannii and E. coli but not against susceptible isolates. Finally, we demonstrate that this combination is also effective in vivo in an A. baumannii/Caenorhabditis elegans infection model (p < 0.001)
Emergence of lanes and turbulent-like motion in active spinner fluid
Authors: Reeves Cody J. , Aranson Igor S. , Vlahovska Petia M.
Published: May 2021

Assemblies of self-rotating particles are gaining interest as a novel realization of active matter with unique collective behaviors such as edge currents and non-trivial dynamic states. Here, we develop a continuum model for a system of fluid-embedded spinners by coarse-graining the equations of motion of the discrete particles. We apply the model to explore mixtures of clockwise and counterclockwise rotating spinners. We find that the dynamics is sensitive to fluid inertia; in the inertialess system, after transient turbulent-like motion the spinners segregate and form steady traffic lanes. At small but finite Reynolds number instead, the turbulent-like motion persists and the system exhibits a chirality breaking transition leading to a single rotation sense state. Our results shed light on the dynamic behavior of non-equilibrium materials exemplified by active spinners.
High shear spheroidal topological fluid flow induced coating of polystyrene beads with C60 spicules
Authors: Jellicoe Matt , Vimalanathan Kasturi , R. Gascooke Jason , Luo Xuan , Raston Colin L.
Published: May 2021

The manipulation of topological fluid flow to fabricate spicular C60 coated polystyrene beads under shear stress in the vortex fluidic device (VFD).
The molecular structure of the surface of water–ethanol mixtures
Authors: Kirschner Johannes , Gomes Anderson H. A. , Marinho Ricardo R. T. , Björneholm Olle , Ågren Hans , Carravetta Vincenzo , Ottosson Niklas , Brito Arnaldo Naves de , Bakker Huib J.
Published: May 2021

A combination of two surface-specific spectroscopy techniques was used to gain unique insights in the molecular-scale properties of the surface of water–ethanol mixtures over a wide range of compositions.
Photon management to reduce energy loss in perovskite solar cells
Authors: Chen Cong , Zheng Shijian , Song Hongwei
Published: May 2021

We systematically and hierarchically reviewed all of the photon management strategies to overcome the energy loss in perovskite solar cells and hope to guide researchers to achieve efficient light-harvesting in semiconductor optoelectronic devices.
Taylor dispersion analysis in fused silica capillaries: a tutorial review
Authors: Moser Meagan R. , Baker Christopher A.
Published: May 2021

Observations of band broadening under well-controlled laminar flow enable absolute, calibration-free determinations of diffusion coefficient.
Microscopic insights into long-range 1D ordering in a dense semi-disordered molecular overlayer
Authors: Hannagan Ryan T. , Onyango Isaac , Larson Amanda , McEwen Jean-Sabin , Sykes E. Charles H.
Published: May 2021

The formation of a two-phase surface molecular overlayer that transitions from isolated propene molecules to a highly ordered 1D chain structure on Cu(111) is elucidated through combined high-resolution STM imaging and DFT-based calculations.
Ring size and nothing else matters: unusual regioselectivity of alkyne hydration by NHC gold(i) complexes
Authors: Rzhevskiy Sergey A. , Philippova Anna N. , Chesnokov Gleb A. , Ageshina Alexandra A. , Minaeva Lidiya I. , Topchiy Maxim A. , Nechaev Mikhail S. , Asachenko Andrey F.
Published: May 2021

We have found that expanded-ring NHC gold(i) complexes efficiently and regioselectively catalyze the hydration of alkylarylacetylenes in an anti-Markovnikov fashion due to steric repulsion build-up in the transition state, giving benzylalkyl ketones.
2D self-assembly and electronic characterization of oxygen–boron–oxygen-doped chiral graphene nanoribbons
Authors: Jin Lei , Bilbao Nerea , Lv Yang , Wang Xiao-Ye , Soltani Paniz , Mali Kunal S. , Narita Akimitsu , De Feyter Steven , Müllen Klaus , Chen Zongping
Published: May 2021

Chemical vapor deposition synthesis of atomically precise oxygen–boron–oxygen-doped chiral graphene nanoribbons and their well-organized 2D self-assembly.
Sunlight assisted SCSC dimerization of a 1D coordination polymer impacts the selectivity of Pd(ii) sensing in water
Authors: Mir Mohammad Hedayetullah , Bera Sambhunath , Khan Samim , Maity Suvendu , Sinha Chittaranjan , Dutta Basudeb
Published: May 2021

This study highlights the switching of the luminescence detection limit of Pd(ii) in aqueous medium by structural transformation of a 1D CP to a 2D CP in a green process using solar radiation.
A computationally designed β-amino acid-containing miniprotein
Authors: Bejger Magdalena , Fortuna Paulina , Drewniak-Świtalska Magda , Plewka Jacek , Rypniewski Wojciech , Berlicki Łukasz
Published: May 2021

A new constrained β-amino acid-containing miniprotein with tertiary and quaternary structures, which were stabilized mainly by hydrophobic interactions, is described.
An electrically driven single microribbon based near-infrared exciton–polariton light-emitting diode
Authors: Zhang Fupeng , Tang Kai , Wan Peng , Kan Caixia , Jiang Mingming
Published: May 2021

An electrically driven exciton–polariton NIR-LED involving an n-ZnO:Ga microribbon/p-GaAs heterojunction was achieved. The Rabi splitting is measured to be 109 meV.
ZnO@ZIF-8 core–shell heterostructures with improved photocatalytic activity
Authors: Chen Mei-Hua , Lu Qian-Ying , Li Yi-Ming , Chu Ming-Ming , Cao Xue-Bo
Published: May 2021

ZnO@ZIF-8 heterostructures with ZnO as the core and ZIF-8 as the shell were successfully fabricated and completely degraded methylene blue in ∼4.5 min under solar light irradiation.
Two-dimensional ZrC2 as a novel anode material with high capacity for sodium ion battery
Authors: Zhang Fei , Jing Tao , Cai Shaohong , Deng Mingsen , Liang Dongmei , Qi Xiaosi
Published: May 2021

A ZrC2 monolayer is an ideal candidate for high-performance anode materials for sodium ion batteries (SIBs).
Silicon/graphite composite anode with constrained swelling and a stable solid electrolyte interphase enabled by spent graphite
Authors: Xu Qi , Wang Qianwen , Chen Dequan , Zhong Yanjun , Wu Zhenguo , Song Yang , Wang Gongke , Liu Yuxia , Zhong Benhe , Guo Xiaodong
Published: May 2021

A silicon/graphite composite anode with constrained swelling and a stable SEI was developed, utilizing the intrinsic merits of the spent graphite.
Transfer learning improves the prediction performance of a LIBS model for metals with an irregular surface by effectively correcting the physical matrix effect
Authors: Shabbir Sahar , Zhang Yuqing , Sun Chen , Yue Zengqi , Xu Weijie , Zou Long , Chen Fengye , Yu Jin
Published: May 2021

Transfer learning allows the effective corrections of both chemical and physical matrix effects in such a way that metals with irregular surfaces can be directly analyzed by LIBS for an accurate elemental determination.
Machine learning assisted fast prediction of inertial lift in microchannels
Authors: Su Jinghong , Chen Xiaodong , Zhu Yongzheng , Hu Guoqing
Published: May 2021

A machine learning assisted algorithm was proposed to quickly obtain the inertial lift forces, allowing researchers to expedite the development of inertial microfluidic devices for particle manipulation without computationally costly simulations.
An environmental pollutant to an efficient solar vapor generator: an eco-friendly method for freshwater production
Authors: Wani Tawseef Ahmad , Garg Parul , Bera Ashok
Published: May 2021

The solar-driven water evaporation technique has shown enormous potential for freshwater generation. Solar vapor generator made of carbonized coconut husk shows an evaporation rate of 3.6 kg m−2h−1with the ability to purify seawater and sewage.
Synthesis and theoretical calculations of metal-antibiotic chelation with thiamphenicol:in vitroDNA and HSA binding, molecular docking, and cytotoxicity studies
Authors: Sharfalddin Abeer A. , Emwas Abdul-Hamid , Jaremko Mariusz , Hussien Mostafa A.
Published: May 2021

New metal complexes showed the magic of the bivalent metal which have higher bioactivity than free ligand.
Structural and electronic properties of FeCl3 and CrO3 interacting with GaP nanotubes from DFT calculations
Authors: Caetano Caio Vinícius , Guerini Silvete , Silva Augusto César Azevedo , de Jesus Gomes Varela Júnior Jaldyr
Published: May 2021

Transition from semiconducting to metallic state in gallium phosphide nanotubes.
Development of low bandgap polymers for red and near-infrared fullerene-free organic photodetectors
Authors: Jeong WonJo , Kang Jinhyeon , Jeong Moon-Ki , Won Jong Ho , Jung In Hwan
Published: May 2021

Two low bandgap donor polymers, PDTPTT and PCPDTTT, were synthesized and their photodetecting properties were investigated under a 680 nm red LED.
Assembling triazolated calix[4]semitubes by means of copper(i)-catalyzed azide–alkyne cycloaddition
Authors: Gorbunov Alexander , Ozerov Nikolay , Malakhova Maria , Eshtukov Artur , Cheshkov Dmitry , Bezzubov Stanislav , Kovalev Vladimir , Vatsouro Ivan
Published: May 2021

Calix[4]arene-based bis(alkynes) and bis(azides) react with each other under thoroughly tuned CuAAC conditions and produce diverse biscalixarene semitube assemblies linked by two triazole units, which are capable of binding transition metal cations.
Guanidine functionalized core–shell structured magnetic cobalt-ferrite: an efficient nanocatalyst for sonochemical synthesis of spirooxindoles in water
Authors: Dadaei Mahla , Naeimi Hossein
Published: May 2021

The core/shell nanoparticles have a wide range of applications in the science of chemistry and biomedical. The core-shell material can be different and modified by changing the ingredients or the ratio of core to the shell.
A highly efficient rod-like-CeO2-supported palladium catalyst for the oxidative carbonylation of glycerol to glycerol carbonate
Authors: Wang Ziyan , Guo Shuo , Wang Zhimiao , Li Fang , Xue Wei , Wang Yanji
Published: May 2021

Pd/CeO2-r was prepared by a two-step hydrothermal-impregnation method for oxidative carbonylation of glycerol. It exhibited high activity, and glycerol conversion was 93% and glycerol carbonate selectivity was 98% with a TOF of 1240 h−1 under optimized conditions.
Intrinsic photogeneration of long-lived charges in a donor-orthogonal acceptor conjugated polymer
Authors: Shaikh Jordan , Congrave Daniel G. , Forster Alex , Minotto Alessandro , Cacialli Franco , Hele Timothy J. H. , Penfold Thomas J. , Bronstein Hugo , Clarke Tracey M.
Published: May 2021

The spatial separation ofPCPDT-sFCN's donor and orthogonal acceptor motifs allows efficient photogeneration of extraordinarily long-lived charge carriers in the pristine polymer, providing an important step towards single-material optoelectronics.
Supramolecular agents for combination of photodynamic therapy and other treatments
Authors: Kwon Nahyun , Kim Heejeong , Li Xingshu , Yoon Juyoung
Published: May 2021

This review provides a summary of important research progress on supramolecular systems that can be used to combine photodynamic therapy (PDT) with photothermal therapy, chemotherapy, and immunotherapy to compensate for the shortcomings of PDT.
“Anti-electrostatic” halogen bonding in solution
Authors: Loy Cody , Holthoff Jana M. , Weiss Robert , Huber Stefan M. , Rosokha Sergiy V.
Published: May 2021

Spontaneous formation of “anti-electrostatic” complexes in solution demonstrates that halogen bonding can be sufficiently strong to overcome anion–anion repulsion when the latter is attenuated by the polar medium.
Modification of gold nanoparticles with a hole-transferring cocatalyst: a new strategy for plasmonic water splitting under irradiation of visible light
Authors: Fudo Eri , Tanaka Atsuhiro , Iguchi Shoji , Kominami Hiroshi
Published: May 2021

The Cr(OH)3/Au/TiO2 plasmonic photocatalyst exhibited reaction rates larger than those of reactions over Au/TiO2 towards both water oxidation and water splitting under irradiation of visible light, in which Cr(OH)3 effectively works as the hole transfer cocatalyst.
2D-structured V-doped Ni(Co,Fe) phosphides with enhanced charge transfer and reactive sites for highly efficient overall water splitting electrocatalysts
Authors: Jeung Yongjae , Jung Hyeonjung , Kim Dokyoung , Roh Hyogyun , Lim Chaeeun , Han Jeong Woo , Yong Kijung
Published: May 2021

2D Ni-based transition metal phosphide catalysts could exhibit improved overall water splitting performance through vanadium doping which increases the electrical conductivity and controls catalyst's adsorption energy with water.
Targeted perfusion adsorption for hyperphosphatemia using mixed matrix microspheres (MMMs) encapsulated NH2-MIL-101(Fe)
Authors: Chen Wenhui , Han Qiu , Liu Yang , Wang Yiwen , Liu Fu
Published: May 2021

A microporous surface and finger-like pores promote mass transfer, and NH2-MIL-101(Fe) wrapped in sponge-like pores inside mixed matrix microspheres (MMMs) can capture phosphate, thereby achieving good adsorption capacity of the MMMs for phosphorus in the blood.
SnS2/MXene derived TiO2 hybrid for ultra-fast room temperature NO2 gas sensing
Authors: Chen Tianding , Yan Wenhao , Wang Ying , Li Jinli , Hu Haibo , Ho Derek
Published: May 2021

MXene derived TiO2 provides a unique platform on which SnS2 can be decorated, achieving heterojunctions and significantly enlarged surface area, both contributing to enhanced gas sensing.
Impact of electric vehicle charging – An agent‐based approach
Authors: Plagowski Patrick , Saprykin Aleksandr , Chokani Ndaona , Shokrollah‐Abhari Reza
Published: May 2021

Several European countries have launched programs to increase the market penetration of battery electric vehicles (BEV). Similarly, politicians in Switzerland have targeted a 15% BEV share of new car registrations by 2022. As each electric car increases the power demand, new challenges are posed to the operation of existing distribution grid infrastructure. Here, a new bottom‐up physical approach is presented that couples agent‐based traffic simulations through an unsteady vehicle power consumption model with distribution grid power flow simulations. The impacts on hourly powerline loads from charging a car fleet with an 8.5% BEV share are quantified in the real distribution grid for the canton of Zurich. The grid is composed of 12,000 buses and 9,800 powerlines, providing power to 398,000 individual customers. Results indicate that the risk of overloaded powerlines is highest in low‐level distribution grids. In our most critical future scenario, with simultaneous 8.5% BEV charging at 8 pm with 11 kW, peak line loads reach up to 132% of rated capacity. Hence, in a potential energy transition towards a decarbonised future, each individual distribution grid could face critical loads at specific temporal and spatial bottlenecks. Thus, grids should be assessed individually to limit uncertainties and risks of critical power system situations.
Bi-objective optimal control of some PDEs: Nash equilibria and quasi-equilibria
Authors: Fernández-Cara E. , Marín-Gayte I.
Published: May 2021

This paper deals with the solution of some multi-objective optimal control problems for several PDEs: linear and semilinear elliptic equations and stationary Navier-Stokes systems. Specifically, we look for Nash equilibria associated with standard cost functionals. For linear and semilinear elliptic equations, we prove the existence of equilibria and we deduce related optimality systems. For stationary Navier-Stokes equations, we prove the existence of Nash quasi-equilibria, i.e. solutions to the optimality system. In all cases, we present some iterative algorithms and, in some of them, we establish convergence results. For the existence and characterization of Nash quasi-equilibria in the Navier-Stokes case, we use the formalism of Dubovitskii and Milyutin. In this context, we also present a finite element approximation and we illustrate the techniques with numerical experiments.
Study on the Feature Space Detection Method of DC Arc Fault for Photovoltaic system
Authors: Sun Liling , Wu Han , Lu Xiangdong
Published: May 2021

An arc fault on the DC side of the photovoltaic system is a potential safety hazard and is difficult to detect due to the complexity of photovoltaic systems. The detection method of series arc fault in photovoltaic systems is investigated here. The DC arc fault test platform for a photovoltaic system is established to collect the current signal under normal and fault conditions. In this study, the time domain characteristics, frequency domain characteristics, and time-frequency domain characteristics are compared by analysing the current data from the photovoltaic system in before and after fault states: corresponding feature vectors are used to construct the arc fault feature space of the system, and according to the position of the current signal in the feature space the fault is detected, so as to realise effective arc fault feature information. Then the method of establishing the arc fault feature space is introduced and key parameters of the feature space are determined. Finally, the anti-interference ability of arc fault feature space detection is verified. The results showed that the detection method is both feasible and accurate.
Description and analysis of typical adjustment scenarios of regional energy system from the perspective of energy network theory
Authors: Zhang Ran , Li Qifen , Yang Yongwen , Song Lifei
Published: May 2021

The district energy system has realized the effective consumption of new energy and the cascade utilization of energy, and has been widely used in the continuous and in-depth advancement of China's urbanization process. The district energy system is an organic combination of source-grid-load, and in practical applications, its components are usually in a dynamic change process, which has a certain impact on the matching of supply and demand of the district energy system. This article first puts forward the concept of district energy network, and then describes the typical adjustment scenarios of its energy supply nodes, energy consumption nodes and energy pipe network side respectively, and allocates energy resources of the district energy network according to various typical adjustment scenarios of the district energy network. The impact of the strategy is analysed to provide a reference for the economic construction of the regional energy system and the rational and efficient use of energy.
Research on Image Recognition of Electrical Equipment based on Deconvolution Feature Extraction
Authors: Li Zhe , Su Haifeng
Published: May 2021

Based on machine learning technology and combining the operation of machine learning from the idea of neural network, this paper focuses on the classification and recognition of image data of transformers, circuit breakers and isolation switches in substations. Firstly, the image enhancement is carried out on the basis of the original image, which simulates the possible scenes in reality. Secondly, using the dual-mode a deconvolutional network to capture significant features from in-depth visible and infrared images. Furthermore, all these features are subjected to the program to conduct transfer learning and weighted fusion. The dual-mode deconvolutional network (DMDN) extracts and highlights the features of the electrical equipment. Compared to traditional model, the recognition accuracy of the improved model is reached at 99.17%.
Experimental Study on Thermal and Catalytic Decomposition of a Dual-Mode Ionic Liquid Propellant
Authors: Gao He , Li Shaolong , Yao Zhaopu , Li Shuiqing
Published: May 2021

With the increasing of space activities and people’s awareness of environmental protection, it is necessary to develop a new non-toxic space propulsion system with high performance. Hydroxylammonium nitrate (HAN)/1-ethyl-3-methyl-imidazolium ethylsulfate([Emim][EtSO4]) blend ionic liquid propellant is a potential replacement with non-toxic and high-performance characteristics for hydrazine type liquid propellants, which can be used in both chemical and electrical propulsion system. This paper introduced the thermogravimetric experimental analysis (TGA-DSC) results of HAN/[Emim][EtSO4] ionic liquid propellant with the thermal decomposition and catalytic decomposition process. Its mass-loss process and exothermic process under different reaction conditions at a heating rate of 5K/min~15K/min were studied. Generally, the mass-loss results showed that there were four characteristic stages during the decomposition process of the HAN/[Emim][EtSO4] ionic liquids, which were the evaporation of the water solvent, decomposition of the HAN component, further decomposition of the [Emim][EtSO4], and slow loss of the residual substances. At the same time, two exothermic peaks were observed, which respectively corresponded to the decomposition of HAN and the further decomposition of [Emim][EtSO4]. Using catalyst can significantly reduce the decomposition temperature of the propellant and the residual mass. The contents in this paper proved that this propellant had a good application prospect within the catalytic ignition aerospace thruster.
Research on Application of Machine Vision in Robots for Live-Power Lines
Authors: Wu Han , Huang Jianye , Lin Shuang , Liu Bingqian , Fan Yuanliang , Chen Haigen
Published: May 2021

The electric fire-exchanging operation is basically used to implement operation such as Wire stripping, drainage wire through the fastening wire clip, clamp bolt fastening, etc. Manual operation is time-consuming and laborious and has very high safety risks, so the automatic electrified ignition robot emerges as The Times require; The automatic operation method should accurately identify the position of wire and drainage line, so as to guide the robot to move and carry out the corresponding operation. Based on this, an intelligent binocular vision guidance method is proposed in this paper. The image data in the working space is collected by the binocular camera in real time, the wire is identified by the image segmentation technology, the wire is separated from the background, and the spatial pose of the wire is solved by the PNP and binocular stereo vision technology. Through YOLOV5 target detection, the position identification and positioning of the thread and clamp of the drainage line are realized, and the automatic fire ignition operation is finally guided by the manipulator. Experiments show that this method has the advantages of high accuracy, good stability and fast speed.
Experimental investigation of AC two-channel gliding arcs discharge plasma driven kerosene cracking
Authors: Zhang Kai , Jin Di , Huang Shengfang , Zhang Wei , Yang Chan
Published: May 2021

To improve the ignition and combustion performance of aviation kerosene, two-channel gliding arcs plasma was adopted to crack kerosene into active components, such as gaseous light hydrocarbons and H2. The influence of carrier gas flow rate on discharge characteristics and cracking effects were investigated. Experimental results indicate that, compared to single channel discharge, the power of two-channel gliding arcs discharge is greater while the arcs cover twice as much area as that of single channel discharge. The cracking rate of two-channel discharge plasma is greater than that of single channel discharge while it shows an upward trend with greater carrier gas flow rate. Among the main components of cracking gas, the molar percentage of hydrogen is the highest and exceeds 50%. Greater carrier gas flow rate would result in lower molar percentage of hydrogen. Interestingly, the ethyl group prefers to form C2H2 as the carrier gas flow rate increases in the two-channel gliding arcs discharge while the molar percentage of C2H2 and C2H4 changes inconspicuously in the single channel discharge.
Design of Campus Financial Risk Prevention and Control Platform under the Background of Big Data
Authors: Li Sijin
Published: May 2021

With the continuous development of information technology and the gradual rise of the Internet financial industry, the incidence of campus fraud is higher and higher, and the financial fraud against college students has gradually attracted widespread attention. In order to study the risk prevention and control factors of College Students’ financial fraud under the background of big data, an information platform is established to release risk information in real time and analyze the risk factors of College Students’ financial fraud. The Internet, big data and campus financial risk prevention and control are combined to improve the financial environment of university campus, improve the prevention awareness of college students, and reduce unnecessary losses.
Reconfiguration Performance of the Urban Power Distribution System Based on the Genetic-Ant Colony Fusion Algorithm
Authors: Bai Longju
Published: May 2021

This study aims to enhance the reliability of the urban power grid system and decrease the economic loss due to power network faults. Based on the analysis of the traditional algorithms for restructuring the urban distribution system after faults, this study proposes an upgraded genetic algorithm (GA) and ant colony algorithm (ACA) and combines these two to overcome the limitations of the local optimum of GAs and low convergence speed of ACAs. Taking the IEEE33-node system as the research object, the network loss, maximum recovery of the power-loss load, and the number of switching operations as the objective function, the impact of different algorithms on the restoration and reconfiguration of the distribution system was examined according to MATLAB system simulation and the optimal algorithm for the reconfiguration of the urban distribution system failure recovery. The experimental results revealed that compared with the current distribution system reconfiguration algorithm, the genetic-ant colony algorithm (GACA) has higher algorithm time efficiency and solution accuracy and can markedly decrease the recovery time and improve the impact of the distribution system in a short period. Overall, the proposed GACA is an efficient self-healing algorithm of urban distribution systems and useful for augmenting the reliability of the urban power system.
Research on the Construction of Multi-dimensional Power Grid Enterprise Asset Health Evaluation Index System
Authors: Cheng Jia Xu , Wang Guan Ran , Liu Jin
Published: May 2021

Most power grid companies are asset-intensive and technology-intensive companies. Therefore, the quality and health of assets and equipment are crucial to the sustainability of the development of power grid companies and the safety of power grid development. To power grid companies through multiple dimensions Decompose the evaluation index of asset health, find the key factors affecting the asset health evaluation of power grid enterprises, and find a way to solve the problem for the subsequent improvement of the health of power grid enterprises’ assets. This paper describes the SMART criteria for asset health assessment, combining the principles of index selection and index grading, and clarifies the principles of constructing the evaluation index system. On this basis, from the three dimensions of physical, economic and social, and considering the internal and external power grid enterprises, a multi-dimensional asset health evaluation index system has been established.
Supply Chain Decisions of Fresh Products for Competitive Suppliers with Traceability Technology
Authors: Zheng Qi , Xiao Qian , Zhao Peiting
Published: May 2021

This paper focuses on the impact of traceability technology adoption on supply chain coordination. We consider a fresh product supply chain consisting of two suppliers and one retailer with centralized and decentralized decision-making. Considering the factors of the tag cost of traceability technology and the freshness of the product, two scenarios-with and without traceability technology are analyzed. The mathematical model is applied to investigate the impact of applying traceability technology on decision-making and profit of supply chain when two suppliers compete. The results show that: (1) the fresh product supply chain with the traceability technology is more profitable than the case that without the traceability technology; (2) when the tag cost of the traceability technology is within the threshold, the supplier’s profit decreases with the increase of the tag cost, and it is always greater than the corresponding profit when comparing with the case that without adopting the traceability technology; (3) if the tag cost of the traceability technology is too high, the retailer can use cost sharing or bargaining with the supplier to encourage him to implement the technology.
Evaluation of crowdsourcing logistics service quality based on entropy weight method and analytic hierarchy process
Authors: Fu Mian , Wang Dan Dan
Published: May 2021

Crowdsourcing logistics mode is the product of sharing economy by integrating idle resources to reduce the operating cost and improve the efficiency of enterprises. Taking the service quality of crowdsourcing logistics as the research object, this paper analyzes the key influencing factors of the service quality of crowdsourcing logistics, and constructs a crowdsourcing logistics service quality evaluation index system with 4 first level indicators and 15 second level indicators. At the same time, by using AHP and entropy weight method, The paper select dada and Renren express to evaluate their service quality. Through the case analysis of the two express companies’ service quality, the paper draw the conclusion that safety is still the most concerned factor in the evaluation of crowdsourcing logistics service quality at this stage.
Team Mindfulness and Employee Moral Efficacy: The Moderating Effect of Team Bottom-Line Mentality
Authors: Li Yang , Ren Han
Published: May 2021

Different from the previous studies that mainly focused on the mindfulness at the individual level, this research explores the effect of team mindfulness on employee moral efficacy, and considers the influence of the interaction between team bottom-line mentality (BLM) and team mindfulness on employees’ moral efficacy. Results from three-wave surveys of 275 employees indicated that: the team BLM will weaken the positive relationship between team mindfulness and employees’ moral effectiveness. This research advances the current understandings of the influencing process between team mindfulness and employees’ moral efficacy by identifying the moderating role of team BLM, and casts the spotlight on the impact mechanism among team mindfulness, team BLM, and employees’ moral efficacy at the team level. Theoretical and practical implications are also discussed.
Niche analysis of dominant species in alpine desert grassland communities in Qaidam Basin
Authors: Sun Jiancai , Li Yonghui , Deng Deting , Yang Sha , Wu Yukun , Shi Huilan
Published: May 2021

Community dominant plants and their ecological niche research is the focus of community ecology research. To explore the niche characteristics of desert dominant plants and the relationship between them and soil factors in Qaidam Basin, and to provide a basis for the construction of desert plant communities and the sustainable management of natural resources in Qaidam Basin. Taking 13 desert plant communities in Qaidam Basin, Qinghai Province as the research objects, this paper analyzed the characteristics of desert plant communities and dominant species based on soil physical and chemical properties, and calculated the niche width and niche overlap of dominant plants. The dominant plants are, Haloxylon ammodendron, Tamarix chinensis, Achnatherum splendens, Poacynum hendersonii, Reaumuria songonica, Phragmites australiss, Sympegma regelii, and Ajania Tenuifolia, Artemisia sphaerocephala, Ceratoides latens, Pearl russianthistle, Scirpustriquter. There were different degree of niche overlap among species in the community. In addition, CCA sequencing showed that different species had different requirements on the environment, and the distribution of dominant species was mainly affected by soil total nitrogen and soil organic matter.
Sustainability Evaluation and Analysis of Poverty Alleviation Projects based on Farmer Cooperatives Taking Lianghe County, Yunnan Province as an example
Authors: Shao Huimin , Li Shuang , Wang Shuzhi , Wang Yujiao
Published: May 2021

Farmer cooperatives play a huge role in anti-poverty practice, and the results are remarkable. However, there is still room for improvement in the research on the sustainability of poverty alleviation projects of farmers’ cooperatives. To this end, the author uses questionnaire surveys, factor analysis and other research methods on the basis of existing research results to analyze the sustainability evaluation dimensions of farmer cooperatives poverty alleviation projects, and builds an evaluation index system. Taking 28 farmer cooperatives poverty alleviation projects in Lianghe County as an example. An empirical analysis of sustainability was carried out, and the following conclusions were drawn: ①The four common factors of the sustainability evaluation system have greater room for improvement; ②Cooperatives with poor information technology factors have relatively poor comprehensive scores for the sustainability of poverty alleviation projects. The research results not only help farmers create more material wealth, but also help realize the strategy of rural revitalization. At the same time, it may enrich the theoretical connotation of anti-poverty, and make corresponding theoretical contributions to the theory of rural revitalization and sustainable development.
Using AI to Implement O2O Home Health Care Program
Authors: Chang Shih-Feng , Du Wei-Fen , Wang Jin , Lin Ma-Yan , Peng Du
Published: May 2021

With the continuous growth of China’s elderly population, the demand for elderly care services has increased dramatically. Due to the influence of Chinese people’s cultural concept of elderly care, most of the elderly are more inclined to home-based care, enjoy the happiness of children and grandchildren, and enjoy family happiness. At present, there are some problems in home-based health care services, such as lack of professional talents and single service mode. This entrepreneurial project which is proposed by Wish Magic has grasped the pain points of China’s elderly care problems, and brought about some problems. Efforts should be made to build a sharing platform for elderly care services, attract professionals to provide professional services for the elderly, and hold diversified activities to meet the material and spiritual needs of the elderly. The planned market strategy of the project is divided into three steps. Firstly, the project will be carried out in the first and second tier cities, and then expanded to the third tier cities. Later, the market will be expanded to the fourth tier cities. At the same time, the project will cooperate with government departments to strive for government funding and policy support, and provide accurate services in combination with online and offline ways, so as to meet the diversified pension needs of the elderly.
Research on the Application of Contactless Intelligent Express Cabinet
Authors: Lu Hongxia
Published: May 2021

Because of the COVID-19 epidemic situation, the advantages of intelligent express cabinet stand out, compared with the traditional terminal distribution. It can not only solve the problem of terminal delivery difficulty but also that of the user privacy assurance, in which the contactless delivery becomes deeply popular because cross-infection is avoided. This paper studies the domestic present situation of the application of intelligent express cabinet and the existing problems, according to the data of 207 copies of questionnaires, analyses the consumer cognition and attitude towards intelligent express cabinet. In order to expand the application market of intelligent express cabinets, the paper puts forward measures such as integrating resources, improving the utilization rate, investigating the needs, reasonable layout, integrating community services, and enriching the profit model.