bluuebunny/crossref_metadata_2025 huggingface dataset:
Discovery of potential inhibitors against New Delhi metallo-β-lactamase-1 from natural compounds: in silico-based methods
Authors: Salari-jazi Azhar , Mahnam Karim , Sadeghi Parisa , Damavandi Mohamad Sadegh , Faghri Jamshid
Published: January 2021

New Delhi metallo-β-lactamase variants and different types of metallo-β-lactamases have attracted enormous consideration for hydrolyzing almost all β-lactam antibiotics, which leads to multi drug resistance bacteria. Metallo-β-lactamases genes have disseminated in hospitals and all parts of the world and became a public health concern. There is no inhibitor for New Delhi metallo-β-lactamase-1 and other metallo-β-lactamases classes, so metallo-β-lactamases inhibitor drugs became an urgent need. In this study, multi-steps virtual screening was done over the NPASS database with 35,032 natural compounds. At first Captopril was extracted from 4EXS PDB code and use as a template for the first structural screening and 500 compounds obtained as hit compounds by molecular docking. Then the best ligand, i.e. NPC120633 was used as templet and 800 similar compounds were obtained. As a final point, ten compounds i.e. NPC171932, NPC100251, NPC18185, NPC98583, NPC112380, NPC471403, NPC471404, NPC472454, NPC473010 and NPC300657 had proper docking scores, and a 50 ns molecular dynamics simulation was performed for calculation binding free energy of each compound with New Delhi metallo-β-lactamase. Protein sequence alignment, 3D conformational alignment, pharmacophore modeling on all New Delhi metallo-β-lactamase variants and all types of metallo-β-lactamases were done. Quantum chemical perspective based on the fragment molecular orbital (FMO) method was performed to discover conserved and crucial residues in the catalytic activity of metallo-β-lactamases. These residues had similar 3D coordinates of spatial location in the 3D conformational alignment. So it is posibble that all types of metallo-β-lactamases can inhibit by these ten compounds. Therefore, these compounds were proper to mostly inhibit all metallo-β-lactamases in experimental studies.
Leachates from plants recently infected by root-feeding nematodes cause increased biomass allocation to roots in neighbouring plants
Authors: Zhang Peihua , Bonte Dries , De Deyn Gerlinde B. , Vandegehuchte Martijn L.
Published: January 2021

Plants can adjust defence strategies in response to signals from neighbouring plants attacked by aboveground herbivores. Whether similar responses exist to belowground herbivory remains less studied, particularly regarding the spatiotemporal dynamics of such belowground signalling. We grew the grass Agrostis stolonifera with or without root-feeding nematodes (Meloidogyne minor). Leachates were extracted at different distances from these plants and at different times after inoculation. The leachates were applied to receiver A. stolonifera plants, of which root, shoot, and total biomass, root/shoot ratio, shoot height, shoot branch number, maximum rooting depth and root number were measured 3 weeks after leachate application. Receiver plants allocated significantly more biomass to roots when treated with leachates from nematode-inoculated plants at early infection stages. However, receiver plants’ root/shoot ratio was similar when receiving leachates collected at later stages from nematode-infected or control plants. Overall, early-collected leachates reduced growth of receiver plants significantly. Plants recently infected by root-feeding nematodes can thus induce increased root proliferation of neighbouring plants through root-derived compounds. Possible explanations for this response include a better tolerance of anticipated root damage by nematodes or the ability to grow roots away from the nematode-infected soil. Further investigations are still needed to identify the exact mechanisms.
Thin-film synthesis of superconductor-on-insulator A15 vanadium silicide
Authors: Zhang Wenrui , Bollinger Anthony T. , Li Ruoshui , Kisslinger Kim , Tong Xiao , Liu Mingzhao , Black Charles T.
Published: January 2021

We present a new method for thin-film synthesis of the superconducting A15 phase of vanadium silicide with critical temperature higher than 13 K. Interdiffusion between a metallic vanadium film and the underlying silicon device layer in a silicon-on-insulator substrate, at temperatures between 650 and 750 °C, favors formation of the vanadium-rich A15 phase by limiting the supply of available silicon for the reaction. Energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction verify the stoichiometry and structure of the synthesized thin films. We measure superconducting critical currents of more than 106 amperes per square centimeter at low temperature in micron-scale bars fabricated from the material, and an upper critical magnetic field of 20 T, from which we deduce a superconducting coherence length of 4 nm, consistent with previously reported bulk values. The relatively high critical temperature of A15 vanadium silicide is an appealing property for use in silicon-compatible quantum devices and circuits.
Lipid indices as simple and clinically useful surrogate markers for insulin resistance in the U.S. population
Authors: Lee Juncheol , Kim Bongyoung , Kim Wonhee , Ahn Chiwon , Choi Hyun Young , Kim Jae Guk , Kim Jihoon , Shin Hyungoo , Kang Jun Goo , Moon Shinje
Published: January 2021

This study aimed to compare the accuracy of novel lipid indices, including the visceral adiposity index (VAI), lipid accumulation product (LAP), triglycerides and glucose (TyG) index, TyG-body mass index (TyG-BMI), and TyG-waist circumference (TyG-WC), in identifying insulin resistance and establish valid cutoff values. This cross-sectional study used the data of 11,378 adults, derived from the United States National Health and Nutrition Examination Survey (1999–2016). Insulin resistance was defined as a homeostasis model assessment-insulin resistance value above the 75th percentile for each sex and race/ethnicities. The area under the curves (AUCs) were as follows: VAI, 0.735; LAP, 0.796; TyG index, 0.723; TyG-BMI, 0.823, and; TyG-WC, 0.822. The AUCs for TyG-BMI and TyG-WC were significantly higher than those for VAI, LAP, and TyG index (vs. TyG-BMI, p < 0.001; vs. TyG-WC, p < 0.001). The cutoff values were as follows: VAI: men 1.65, women 1.65; LAP: men 42.5, women 42.5; TyG index: men 4.665, women 4.575; TyG-BMI: men 135.5, women 135.5; and TyG-WC: men 461.5, women 440.5. Given that lipid indices can be easily calculated with routine laboratory tests, these values may be useful markers for insulin resistance risk assessments in clinical settings.
Transition and identification of pathological states in p53 dynamics for therapeutic intervention
Authors: Jangid Amit , Malik Md. Zubbair , Ramaswamy Ram , Singh R. K. Brojen
Published: January 2021

We study a minimal model of the stress-driven p53 regulatory network that includes competition between active and mutant forms of the tumor-suppressor gene p53. Depending on the nature and level of the external stress signal, four distinct dynamical states of p53 are observed. These states can be distinguished by different dynamical properties which associate to active, apoptotic, pre-malignant and cancer states. Transitions between any two states, active, apoptotic, and cancer, are found to be unidirectional and irreversible if the stress signal is either oscillatory or constant. When the signal decays exponentially, the apoptotic state vanishes, and for low stress the pre-malignant state is bounded by two critical points, allowing the system to transition reversibly from the active to the pre-malignant state. For significantly large stress, the range of the pre-malignant state expands, and the system moves to irreversible cancerous state, which is a stable attractor. This suggests that identification of the pre-malignant state may be important both for therapeutic intervention as well as for drug delivery.
Author Correction: Crystal structure of Type IX secretion system PorE C-terminal domain from Porphyromonas gingivalis in complex with a peptidoglycan fragment
Authors: Trinh Nhung Thi Trang , Tran Hieu Quang , Van Dong Quyen , Cambillau Christian , Roussel Alain , Leone Philippe
Published: January 2021

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
A label-free immunosensor for the detection of a new lung cancer biomarker, GM2 activator protein, using a phosphomolybdic acid/polyethyleneimine coated gold nanoparticle composite
Authors: Kuntamung Kulrisa , Sangthong Padchanee , Jakmunee Jaroon , Ounnunkad Kontad
Published: January 2021

A novel electrochemical immunosensor for the detection of a new lung cancer biomarker based on a polyoxometalate-adsorbed poly(ethylenimine)-coated gold nanoparticle modified electrode.
Total structural determination of alloyed Au15.37Cu16.63(S-Adm)20 nanoclusters with double superatomic chains
Authors: Tang Li , Deng Shiyao , Wang Shuxin , Pei Yong , Zhu Manzhou
Published: January 2021

We report the first nanotube-like Au–Cu alloy nanocluster, which is formed by the assembly of two superatomic chains.
AIEgen modulated per-functionalized flower-like IRMOF-3 frameworks with tunable light emission and excellent sensing properties
Authors: Li Xujie , Xie Siqi , Hu Yuanzhuo , Xiang Jun , Wang Lumin , Li Ruili , Chen Miao , Wang Fangbin , Liu Qi , Chen Xiaoqing
Published: January 2021

A series of functional IRMOF-3 frameworks with solid-state luminescence and tuneable light emission (from 490 to 608 nm) have been synthesized by per-functionalizing AIE-active Schiff-bases with zinc.
Solvent-assisted synthesis of dendritic cerium hexacyanocobaltate and derived porous dendritic Co3O4/CeO2 as supercapacitor electrode materials
Authors: Xie Hongtao , Geng Qin , Liu Xiaoyue , Xu Xia , Wang Fei , Mao LiMin , Mao Jian
Published: January 2021

Here, we report a solvent-mediated synthetic route for preparing cerium hexacyanocobaltate with a dendritic shape. The porous dendritic Co3O4/CeO2 was prepared after annealing at 500 °C, served as a supercapacitor electrode.
A theoretical study on the role of ammonium ions in the double-layered V2O5 electrode
Authors: Qu Zilin , Zhou Bo , Li Bo , Song Qi , Cao Yong Hua , Jiang Zhenyi
Published: January 2021

Theoretical studies confirm that the NH4+ can migrate in double-layered V2O5 with a lower energy barrier by forming the hydrated [NH4·nH2O]+ ions. NH4+ can be used as a good pillar and it facilitates the diffusion of Li+, Zn2+, Na+ and Mg2+ ions.
Nucleophilic degradation of diazinon in thermoreversible polymer–polymer aqueous biphasic systems
Authors: Millan Daniela , Almeida Mafalda R. , Rufino Ana F. C. S. , Coutinho João A. P. , Freire Mara G.
Published: January 2021

Polymer–polymer aqueous two-phase systems involve thermoreversible reaction–separation processes in the nucleophilic degradation of diazinon and further separation of the reaction products.
Microsolvation of Zn cations: infrared multiple photon dissociation spectroscopy of Zn+(H2O)n (n = 2–35)
Authors: Cunningham Ethan M. , Taxer Thomas , Heller Jakob , Ončák Milan , van der Linde Christian , Beyer Martin K.
Published: January 2021

The structures, along with solvation evolution, of size-selected Zn+(H2O)n (n = 2–35) complexes have been determined by combining infrared multiple photon photodissociation (IRMPD) spectroscopy and density functional theory.
New advances in using Raman spectroscopy for the characterization of catalysts and catalytic reactions
Authors: Hess Christian
Published: January 2021

Besides new methods this review highlights developments in signal enhancement, the types of information available from Raman spectra and their theoretical description, the application to working catalysts (operando), as well as future directions.
Facile and direct halogenation of 1,2,3-triazoles promoted by a KX–oxone system under transition metal free conditions
Authors: Rai Vishakha , Sorabad Ganesh Shivayogappa , Maddani Mahagundappa Rachappa
Published: January 2021

A convenient and efficient oxidative halogenation of 4-aryl 1,2,3-triazoles is realized at ambient temperature under transition metal free conditions.
A competitive effect of acceptor substitutions on the opto-electronic features of triphenylamine cored di α-cyanostilbene derivatives
Authors: Kumari Beena , Paramasivam Mahalingavelar , Mukherjee Tarushyam , Khandelwal Shikha , Dutta Arnab , Kanvah Sriram
Published: January 2021

Acceptor strength regulates the ICT mechanism via AIE or ACQ processes.
Laser nanobubbles induce immunogenic cell death in breast cancer
Authors: Nguyen Hieu T. M. , Katta Nitesh , Widman Jessica A. , Takematsu Eri , Feng Xu , Torres-Hurtado Susana A. , Betancourt Tania , Baker Aaron B. , Suggs Laura J. , Milner Thomas E. , Tunnell James W.
Published: January 2021

Laser nanobubbles induce dendritic cell activation in breast cancer cells.
Confined water radiolysis in aluminosilicate nanotubes: the importance of charge separation effects
Authors: Pignié Marie-Claire , Shcherbakov Viacheslav , Charpentier Thibault , Moskura Mélanie , Carteret Cédric , Denisov Sergey , Mostafavi Mehran , Thill Antoine , Le Caër Sophie
Published: January 2021

We demonstrate in this work the spontaneous curvature-induced charge separation in inorganic aluminosilicate nanotubes, making them very interesting potential co-photocatalysts.
Live-cell imaging of the nucleolus and mapping mitochondrial viscosity with a dual function fluorescent probe
Authors: Mukherjee Tarushyam , Soppina Virupakshi , Ludovic Richert , Mély Yves , Klymchenko Andrey S. , Collot Mayeul , Kanvah Sriram
Published: January 2021

One probe but two targets: viscous mitochondria to nucleolar staining.
Copper–ligand clusters dictate size of cyclized peptide formed during alkyne–azide cycloaddition on solid support
Authors: Kandler Rene , Das Samir , Nag Arundhati
Published: January 2021

We report the heterogeneous controlled formation of monomeric cyclic peptides by CuAAC reaction using cooper–piperidine complexes.
Chemisorption of hydrogen sulfide over copper-based metal–organic frameworks: methanol and UV-assisted regeneration
Authors: Gupta Nishesh Kumar , Kim Suho , Bae Jiyeol , Kim Kwang Soo
Published: January 2021

H2S adsorption and regeneration of Cu-based MOFs.
Is Cu instability during the CO2 reduction reaction governed by the applied potential or the local CO concentration?
Authors: Wilde Patrick , O'Mara Peter B. , Junqueira João R. C. , Tarnev Tsvetan , Benedetti Tania M. , Andronescu Corina , Chen Yen-Ting , Tilley Richard D. , Schuhmann Wolfgang , Gooding J. Justin
Published: January 2021

The stability of bimetallic AgCu and PdCu catalysts for electrochemical CO2RR is investigated using the combination of operando and ex situ TEM. The local CO concentration is identified as the main link between activity, stability and selectivity.
Characterization and reactivity study of non-heme high-valent iron–hydroxo complexes
Authors: Keshari Kritika , Bera Moumita , Velasco Lucía , Munshi Sandip , Gupta Geetika , Moonshiram Dooshaye , Paria Sayantan
Published: January 2021

One-electron oxidation of an FeIII–OH complex (1) results in the formation of a FeIII–OH ligand radical complex (2). Its reaction with (C6H5)3C˙ results in the formation of (C6H5)3COH, which is a functional mimic of compound II of cytochrome P450.
Correction: Hydrogen production from natural gas and biomethane with carbon capture and storage – A techno-environmental analysis
Authors: Antonini Cristina , Treyer Karin , Streb Anne , van der Spek Mijndert , Bauer Christian , Mazzotti Marco
Published: January 2021

Correction for ‘Hydrogen production from natural gas and biomethane with carbon capture and storage – A techno-environmental analysis’ by Cristina Antonini et al., Sustainable Energy Fuels, 2020, 4, 2967–2986, DOI: 10.1039/D0SE00222D.
Self-diffusion scalings in dense granular flows
Authors: Artoni Riccardo , Larcher Michele , Jenkins James T. , Richard Patrick
Published: January 2021

The self-diffusivity tensor in homogeneously sheared dense granular flows is anisotropic. We show how its components depend on solid fraction, restitution coefficient, shear rate, and granular temperature.
Critical Casimir interactions of colloids in micellar critical solutions
Authors: Helden Laurent , Knippenberg Timo , Tian Li , Archambault Aubin , Ginot Felix , Bechinger Clemens
Published: January 2021

We study the temperature-dependence of critical Casimir interactions in a critical micellar solution of the nonionic surfactant C12E5 dissolved in water.
A thermally robust and strongly oxidizing surface of WO3hydrate nanowires for electrical aldehyde sensing with long-term stability
Authors: Zhang Guozhu , Hosomi Takuro , Mizukami Wataru , Liu Jiangyang , Nagashima Kazuki , Takahashi Tsunaki , Kanai Masaki , Sugiyama Takeharu , Yasui Takao , Aoki Yuriko , Baba Yoshinobu , Ho Johnny C. , Yanagida Takeshi
Published: January 2021

Thermally robust and strongly oxidizing surface is created by a simple strong acid treatment on WO3hydrate nanowires, which enables integrated nanosensors to operate with a superior sensing performance to aldehyde molecules with long-term stability.
Carbon dots derived fromFusobacterium nucleatumfor intracellular determination of Fe3+and bioimaging bothin vitroandin vivo
Authors: Liu Lijuan , Zhang Shengting , Zheng Xiaodan , Li Hongmei , Chen Qi , Qin Kunhao , Ding Yafang , Wei Yunlin
Published: January 2021

Fusobacterium nucleatumhas been employed for the first time to synthesize fluorescent carbon dots which could be applied for the determination of Fe3+ions in living cells and bioimagingin vitroandin vivowith excellent biocompatibility.
Preyssler-type polyoxometalate-based crystalline materials for the electrochemical detection of H2O2
Authors: Zhu HaoTian , Tang WenSi , Ma YuanYuan , Wang YongHui , Tan HuaQiao , Li YangGuang
Published: January 2021

Four Preyssler-type polyoxometalate-based organic–inorganic hybrid materials were synthesized as non-enzymatic H2O2 electrochemical sensors, with high sensitivity and low detection limit.
A multifunctional benzothiadiazole-based fluorescence sensor for Al3+, Cr3+ and Fe3+
Authors: Yao Shu-Li , Xiong Yu-Chen , Tian Xue-Mei , Liu Sui-Jun , Xu Hui , Zheng Teng-Fei , Chen Jing-Lin , Wen He-Rui
Published: January 2021

A benzothiadiazole-based ZnII MOF (JXUST-3) has been synthesized, which is a good multifunctional chemosensor for the detection of Al3+, Cr3+ and Fe3+.
The relentless variability of Mrk 421 from the TeV to the radio
Authors: Arbet-Engels A. , Baack D. , Balbo M. , Biland A. , Blank M. , Bretz T. , Bruegge K. , Bulinski M. , Buss J. , Doerr M. , Dorner D. , Elsaesser D. , Hildebrand D. , Mannheim K. , Mueller S. A. , Neise D. , Noethe M. , Paravac A. , Rhode W. , Schleicher B. , Sedlaczek K. , Shukla A. , Sliusar V. , Walter R. , von Willert E.
Published: January 2021

Context.The origin of theγ-ray emission of the blazarMrk 421is still a matter of debate.

Aims.We used 5.5 years of unbiased observing campaign data, obtained using the FACT telescope and theFermi-LAT detector at TeV and GeV energies, the longest and densest so far, together with contemporaneous multi-wavelength observations, to characterise the variability ofMrk 421and to constrain the underlying physical mechanisms.

Methods.We studied and correlated light curves obtained by ten different instruments and found two significant results.

Results.The TeV and X-ray light curves are very well correlated with a lag of < 0.6 days. The GeV and radio (15 Ghz band) light curves are widely and strongly correlated. Variations of the GeV light curve lead those in the radio.

Conclusions.Lepto-hadronic and purely hadronic models in the frame of shock acceleration predict proton acceleration or cooling timescales that are ruled out by the short variability timescales and delays observed in Mrk 421. Instead the observations match the predictions of leptonic models.
Spicules and downflows in the solar chromosphere
Authors: Bose Souvik , Joshi Jayant , Henriques Vasco M. J. , van der Voort Luc Rouppe
Published: January 2021

Context. High-speed downflows have been observed in the solar transition region (TR) and lower corona for many decades. Despite their abundance, it has been hard to find signatures of such downflows in the solar chromosphere.

Aims. In this work, we target an enhanced network region which shows ample occurrences of rapid spicular downflows in the Hα spectral line, which could potentially be linked to high-speed TR downflowing counterparts.

Methods. We used the k-means algorithm to classify the spectral profiles of on-disk spicules in Hα and Ca II K data observed from the Swedish 1 m Solar Telescope and employed an automated detection method based on advanced morphological image processing operations to detect such downflowing features, in conjunction with rapid blue-shifted and red-shifted excursions (RBEs and RREs).

Results. We report the existence of a new category of RREs (termed as downflowing RRE) for the first time that, contrary to earlier interpretation, are associated with chromospheric field aligned downflows moving toward the strong magnetic field regions. Statistical analysis performed on nearly 20 000 RBEs and 15 000 RREs (including the downflowing counterparts), which were detected in our 97 min long dataset, shows that the downflowing RREs are very similar to RBEs and RREs except for their oppositely directed plane-of-sky motion. Furthermore, we also find that RBEs, RREs, and downflowing RREs can be represented by a wide range of spectral profiles with varying Doppler offsets, and Hα line core widths, both along and perpendicular to the spicule axis, that causes them to be associated with multiple substructures which evolve together.

Conclusions. We speculate that these rapid plasma downflows could well be the chromospheric counterparts of the commonly observed TR downflows.
Research on load transfer based on power supply unit of distribution network
Authors: Wu Tianchen , Han Jun , Cai Chao , Fan Anjie
Published: January 2021

In this paper, the medium voltage distribution network is used as the research object, and the NSGA-II algorithm is used to realize efficient search of load transfer routes. The distribution network topology is formed by the CIM information model, and the load groups carried by each section of the line are calculated. By simulating a fault, determine the power outage area, search for the load transfer path of the adjacent non-faulted power loss area, and combine different load sections to perform power flow calculation, verify whether the equipment load on the transfer channel exceeds the limit, and determine whether the transfer path is effective. The entire optimization process utilizes the fast non-dominated sorting and crowding comparison operators of the NSGA-II algorithm. While maintaining the diversity of the optimal population, through the elite strategy, the sampling space is expanded, so that the optimal process is more evenly distributed in the solution space.
Experimental study of a piezoelectric cantilever beam under droplet impact
Authors: Hao Guannan , Li Zengliang , Dong Xiangwei
Published: January 2021

The dynamic response of a piezoelectric cantilever beam under droplet impact is investigated by conducting impact tests. Both droplet dynamic behaviours and voltage output can be acquired simultaneously by means of high-speed camera capturing technique. The surface wettability and the macrotextures affect the voltage generation in different ways. For all droplet sizes, both the super-hydrophobic-treated and untreated surfaces of the cantilever beam can generate the same magnitude of peak voltage. However, at lower impact velocity, the voltage generated from the untreated surface is slightly higher than the treated surface due to different impact mechanisms upon droplet-substrate interactions. For higher impact velocity, large-scaled droplets can experience splash and water spilling phenomena on the treated and untreated surface respectively, leading to mechanical energy loss of the system. But the treated surface shows a better performance. With the presence of a single macrotexture on the treated surface, there is a critical impact velocity which determines the transition of voltage output. For small-scaled droplets, the surface with the presence of a single macrotexture outperforms only with velocities over the critical value. For larger droplet size, the same trend can be obtained but the effect of the macrotexture is less significant. These outcomes from impact experiments may lay a foundation for future study of exploring new surfaces for piezoelectric energy harvesting devices in the aim of improving the raindrop energy recovery efficiency.
Comprehensive Control Method of Gas in Upper Corner of High Strength Fully Mechanized Coal Mine
Authors: Duan Huijun , Hao Shijun , Peng Xu
Published: January 2021

Based on the problem of large gas emission and serious gas accumulation in upper corner of the intensive fully mechanized caving face, taking the fully mechanized caving face of Wangjialing Coal Mine in Hedong Mine as the research object, the main gas emission sources of the extremely intensive mining face with low permeability and low gas content were studied. The methods of gas extraction by inserting (burying) pipe in upper corner and directional drilling in upper corner were adopted and carried out. The application of engineering practice and comparative test of effect are carried out. The results show that the maximum extraction purity is 2.8 m³/min, the maximum gas concentration is 0.8% in upper corner, 3.11 m³/min in the high directional borehole and 0.71% in upper corner. After combined extraction, the total extraction purity is 1.33~7.93 m³/min and the fluctuation range of gas concentration in upper corner is reduced to 0.31~0.61% safe point. The effect of gas prevention and control in working face is remarkable.
Research on the Influence of Distributed Generation on Voltage in Rural Distribution Network
Authors: Zeyuan Shen , Wei Song , Haibo Zhao , Chunhui Li , Zebo Shen , Ende Hu , Yahong Xing , Miao Wang , Wei Gao
Published: January 2021

With the development of photovoltaic projects for poverty alleviation, large number of distributed photovoltaic power plant is incorporated rural grid. On the one hand, photovoltaic poverty project can increase the income of farmers, on the other hand, it can improve the low voltage problem of rural distribution network. While photovoltaic power plant incorporating makes the distribution network from traditional radial network become active network, and causes a change of voltage distribution in feeder. Rural grid distribution network is the weakest link in the entire grid. So that it is necessary to analyse the influence factors of voltage distribution and the interconnection principles of photovoltaic power station. In this paper, through the modeling and simulation of distributed photovoltaic access to rural distribution network, analyses the law of the capacity and access location of photovoltaic power integration in the distribution network, and summarizes the interconnection requirements of the photovoltaic power station. The results show that only reasonable and proper use the distributed photovoltaic power plant, can play the role of voltage support and solve the problem of low voltage in rural distribution network.
Thermal Simulation of Power Lithium-ion Battery Module
Authors: Zeng Fancong , Zuo Zhijiang , Li Han , Pan Libo
Published: January 2021

Thermal management of power lithium-ion battery modules is very important to avoid thermal problems such as overheating and out of control, the study of thermal behavior of battery modules can provide guidance for the design and optimization of modules and thermal management. In this paper, a 3d thermal model of the power lithium-ion battery module is established based on STARCCM+ by using computational fluid dynamics (CFD) method, and a grid independence simulation test is used to determine the number of grids, the temperature distribution is analyzed under the condition of 1C charge current. The research results show that the internal temperature rises gradually with the charge going on, the temperature distribution of the cells is basically symmetrical. When the heat transfer coefficient is 5W/(m2⋅K) and the natural convective air inlet temperature is 300K, the module temperature uniformity is good. But because of the maximum temperature slightly higher than the temperature of thermal runaway, additional cooling methods need to be considered to cool the battery.
Responses and Thoughts of Transportation Construction Projects in the Reform of Environmental Review and Approval System in the New Situation
Authors: Yao Haibo , Yao Bing , Wu Shihong , Han Jian
Published: January 2021

The Ministry of Ecology and Environment has promoted the reform of the environmental impact assessment approval system for construction projects. It has formulated and implemented a positive list of environmental assessment approvals, simplified and optimized the environmental assessment approval process, improved approval efficiency, and effectively guaranteed the smooth development of various construction projects. The long-term implementation mechanism in the future points out the direction; through the study of the reform of the environmental review and approval system under the new situation, the corresponding suggestions for the construction unit and technical unit of the transportation construction project are put forward.
Anti-cracking Technology and Application of Fiber Reinforced Concrete on Bridge Deck Pavement
Authors: Pang Li guo , Yu Lei , Chai Ming ming , Zhang Biao zhi
Published: January 2021

In order to make the bridge deck pavement not easy cracking, the anti-cracking technology is put into effect on a certain bridge. The cementing material is selected after analyzing the theory that how fiber can enhance the concrete anti-cracking performance. The proper fiber is selected by testing and comparing the dispersibility and hydroscopicity of three kinds of fibers. The proper content of fiber is found by test and comparing different fiber contents in the same mix proportion concrete. The fiber is sent into the in forced-mixing concrete plant by spreading the fiber on the crawler belt. The construction technology including slab treatment, transport, pave, vibrate and curing is put forward. After 1 year observing, there is no any cracking on the bridge deck pavement. The life of bridge is increased. The cost of maintain is decreased. The goal of anti-cracking has been achieved.
Thermal stress damage effect of matrix modified CFRP subjected to lightning
Authors: Bin LI , Fei CHANG , Xiaolong WEI , Yao XIAO , Weifeng HE , Yueke Ming , Zhangzhi DONG
Published: January 2021

Aiming at the carbon fiber reinforced plastics (CFRP) of poor electrical conductivity which will lead to thermal stress damage due to intense Joule effect under lightning strikes, electro-thermal-structure coupling models of CFRP lightning strikes were established. By analyzing the thermal strain, thermal stress and status of the modified and unmodified CFRP, their thermal expansion characteristics were compared. Compared with the unmodified CFRP, the thermal strain peak value of the modified CFRP is respectively increased by 36.33%, 53.92%, 66.62%, and the thermal stress peak value of them is respectively reduced by 22.63%, 26.53%, and 9.45% in the absence of dielectric breakdown. But in the breakdown state, both specimens appear complete delamination damage, the protective effect of matrix modification becomes invalid. The thermal stress damage is found having little effect on the damage morphology of the specimens after lightning strikes by comparing their CT images.
A Review on the Properties of Biomass Active Mixed Materials for Concrete
Authors: Bin Yang , Bo Ma , Zhixuan Zhang
Published: January 2021

Experiment shows that wheat straw ash has rich biomass activity. Many scholars have shown that the strength, durability, freezing and thawing resistance of concrete have changed greatly after the wheat straw ash material is mixed into concrete as an active mixed material. This paper reviews and looks forward to the future development direction.
Design, simulation and experimental verification of heat transfer structure in thermoelectric cooling helmets
Authors: Tian Zhaoshen , Xu Ju
Published: January 2021

In order to solve the problem of sunstroke for helmet wearing person under strong sunshine or close hot environments due to the high temperature between the person’s head and the helmet, a thermoelectric cooling helmet is proposed. However, due to the curve nature of the head, the even temperature distribution inside the helmet is normally a big challenge, we propose a thermoelectric cooling helmet using thermoelectric cooler (TEC) combining a new heat transfer design scheme. In this design, using hydrogel with very high percentage of water filled in soft package attached on high thermal conductive thin fins is applied to establish a heat transfer channel between the head and the cold surface of the thermoelectric cooler. The control of the cold surface temperature of the thermoelectric cooler element and the rapid heat transfer of the high thermal conductive thin fins provide precise control of the internal temperature of the helmet, while enhancing the comfort of the helmet by utilizing the softness of the hydrogel. The heat transfer structure of this combination of high thermal conductive thin fins and hydrogel is a very important guide for the heat dissipation of other curved heat generating objects.
An adjustable parameter water hammer wave hose testbench
Authors: Wang Zhe , Xia Bensong , Jing Xiajie , Xing Keli
Published: January 2021

In this paper, based on the servo valve controlled pressure cylinder, a scheme of hydraulic pipeline adjustable parameters water hammer wave test system is proposed. By changing the quality of pressure cylinder piston rod and controlling the opening of servo valve, the overshoot, pressure rise rate and oscillation of water hammer wave can be controlled. On this basis, based on AMESim simulation software, the paper studies the influence of different parameters of pressure cylinder and servo valve on water hammer wave, which provides the basis for the selection of main components. Finally, the experimental research is carried out on the designed system, and the results are consistent with the simulation results. The generated water hammer wave meets the requirements of the test standard, which proves that the hydraulic adjustable parameters water hammer test system developed in this paper is successful and feasible.
Configuration method of PSS lead-lag compensator parameters
Authors: Zhu Yingfeng , Zhang Yongming , Xie Xiaosu , Yang Dong , Gao Song , Zhang Weichao , Yuan Xunkui
Published: January 2021

Power System Stabilizer (PSS) is an important measure to increase damping and suppress low frequency oscillations of power system. During PSS test, the time constant of lead-lag compensator need to be configured, considering the inefficiency and optimization problem when configuring parameters empirically, this paper proposes automatic configuration method of PSS parameters based on Matlab, by setting the expected phase value at each frequency and constructing the objective function with the sum of phase differences square, the automatic calculation of PSS parameters under specific phase requirements at each frequency can be realized, the detailed steps of this method are given, and the method is verified during the PSS test of an 300Mw thermal-power generating unit finally.
Design and Application of Automatic Monitoring System of Water Environment Using GIS
Authors: Li Deng , Fengjiao Hu , Jingxing Chen
Published: January 2021

in order to achieve more effective management and monitoring of water environment, an automatic monitoring system is designed for the water environment of Heihe River Basin in Zhangye through GIS (geographic information system). The EFDC (environmental fluid dynamics code) model is used to establish the automatic monitoring model of water environment, and the annual average data of permanganate index of Yingluoxia, Gaoya hydrological station, and Liubaqiao in Heihe River Basin from 2015 to 2019 are used to fit and verify the water quality model. The trend suggests that the simulated data of the three observation points are close to the measured data. The fitting degree reveals that the R index of fitting curve of Liubaqiao is 0.793, while that of Yingluoxia, and Gaoya hydrological station is higher than 0.8, with good fitting degree. The average relative error between the simulated value and the measured value of permanganate index (mg/L) is small, the change trend is basically consistent, and the prediction error is small. The model is successfully established and applied to the automatic monitoring and early warning system of total phosphorus index.
Numerical simulation of slope stability of the abandoned dreg site
Authors: Wang Xiao , Deng Zhigang , Ni Dong , Zhang Dong , Zhao Jing
Published: January 2021

A mathematical model of No. 1 abandoned dreg site of the newly-built highway from Xiangle village, Pingyao County to Hougou village, Qinyuan County was developed using GeoStudio software. The stability of the abandoned dreg site was simulated and analyzed under rainstorm. As a result, the influence of rainfall infiltration on slope seepage field is not limited to the rainfall process. The slope stability coefficient decreases significantly during the rainfall and the decreases slightly after the rainfall stopped due to continuous rainwater seepage. The minimum safety coefficient is 2.292 at 24h, greater than the allowable value, which demonstrates that the slope is stable.
Optimization of SLS forming parameters in the dimensional accuracy of formed parts
Authors: ZHU Hong , HOU Gaoyan
Published: January 2021

In selective laser sintering powder forming, the performance and dimensional accuracy of the formed part are affected by the process parameters. Different materials have different process parameters, and there is still no reference standard for PA materials. To solve this problem, in response to this problem, PA2200 material was selected, and the influence of scanning interval and scanning speed on the dimensional accuracy of the formed part was analyzed. Through theoretical analysis and experiments, the optimal process parameters were obtained. The best combination of parameters is a scanning speed of 4000mm/s, a scanning interval of 0.5mm, and the size of the molded part has a X-axis deviation -0.35%, a Y-axis deviation -0.4%, and a Z-axis deviation -0.25%.
Influence of steam heat transfer tube damage characteristics on burst pressure
Authors: Peng Zhizhen , Ren Shangkun
Published: January 2021

The corrosion damage and leakage of heat transfer tube of steam generator were important factors of nuclear power accident, which is closely related to the national nuclear power production safety and people's life and property. The influence of the size change of cylindrical defect on burst pressure of inconel690 alloy heat transfer tube was studied by finite element simulation and experimental measurement. According to the simulation and test data, the relationship between burst pressure and damage parameter is established. The results show that for cylindrical defects with small depth, there is an extreme point of cylinder damage diameter b which makes the damage maximum, which makes the burst pressure at a minimum. The research results can provide reference for accurate evaluation of residual life of heat transfer tubes.
Comparative Study on Performance of Renewable Energy Building Energy Supply System
Authors: Xiufang Jiang , Rongdan Diao , Li Zeng , Ying Zhang , Xinrong Lei
Published: January 2021

The air source heat pump water system test bench and the compact all-glass vacuum tube solar water heating system test bench are (were) built on the roof of two adjacent teacher’s apartment buildings with the same structure, shape and material were constructed to study the performance of energy supply systems for different types of renewable energy buildings. The energy supply system performance and the performance parameters are comprehensively and systematically analyzed in the same environment conditions of the same period. The results show that the weight coefficients of the performance parameters of the two energy supply systems are equal by means of extension theory analysis. At the last, the comprehensive correlation degree Kj(1) of water outlet temperature on the performance of renewable energy power supply system is 2.07, the comprehensive correlation degree Kj(2) of water inlet temperature is 2.04, the comprehensive correlation degree Kj(3) of air temperature is 2.14, the comprehensive correlation degree Kj(4) of solar radiation is 4.97, and the comprehensive correlation degree Kj(5) of sunshine hours is 3.78.
Hydrogen energy system for renewable energy consumption
Authors: Jie SONG , Yuting ZHU , Danxi LIANG , Qing CHENG , Dawei YAO , Weihan BAO
Published: January 2021

As a kind of high-quality secondary energy, hydrogen has great potential of application in energy storage and utilization and contributes to consumption of renewable energy in electric power systems. To further increase the proportion of renewable energy in primary energy consumption, this article introduces a hydrogen energy system for renewable energy consumption. In this article, significance and necessity of developing hydrogen energy system are elaborated, the overall structure of hydrogen energy system is presented, key technologies involved with hydrogen system are listed, economical efficiency of hydrogen energy system is analyzed, and development of hydrogen energy system in the future is forecasted.
Theoretical study of electrode materials for sodium ion batteries based on Graphether/Graphene heterostructure
Authors: Li Lei , Liu Chun-Sheng
Published: January 2021

The graphether/graphene vdW heterostructure has been systematically studied as an electrode material for sodium batteries based on density functional theory. We predict that the graphether/graphene heterostructure exhibits low diffusion barrier and large capacity. All these calculation results suggest that the graphether/graphene heterostructure can be used as a future commercial anode material for sodium ion batteries.
Study on aging of lignin modified asphalt under thermogravimetric conditions
Authors: Fu Xin , He Mao , Liu Yuancai
Published: January 2021

In order to study the aging process of lignin-modified asphalt and explore the effect of lignin on the anti-aging performance of base asphalt, 4 sets of lignin-modified asphalt were prepared under different base asphalt, different dosage, temperature and time. Based on the thermal oxidation test (TFOT), dynamic shear rheological test (DSR), thermogravimetric test (TG), and infrared spectroscopy micro-performance test (FTIR), the high-temperature rheological properties and performance of aging lignin-based asphalt with different content were investigated. The changing law of the chemical properties of functional groups. The results show that the addition of lignin to the base asphalt sample increases the complex shear modulus G* and decreases the phase angle δ compared to the base asphalt sample prepared by the same sample preparation process. In the same sample, with the continuous increase of the test temperature, the complex shear modulus G* of the matrix asphalt before or after aging and the modified asphalt with different content of lignin showed a downward trend. The modification mechanism of lignin on asphalt is essentially that lignin decomposes and reacts with oxygen in the process of thermal oxidative aging, which delays the oxidation reaction of asphalt during aging, so as to achieve the anti-aging effect of asphalt.
Natural lead-enriched biochar modifies TiO2 photocatalytic activation of sodium persulfate to degrade 2,4-dichlorophenol
Authors: Lu Xiangxin , Tan Wenbing , Xi Beidou , Zhao Xiuyun
Published: January 2021

Due to the rapid development of the modern chemical industry, a large amount of chlorophenol pollutants remain in the environment. It poses a serious threat to the ecological environment and human health. Advanced oxidation technologies (AOPs) have the characteristics of mild reaction conditions and strong oxidation capacity, and are currently recognized as safe and effective pollutant treatment technologies. In this study, natural lead-rich biochar materials were used to activate sodium persulfate to degrade 2,4-dichlorophenol, and natural lead-rich biochar modified TiO2 photocatalytically degraded 2,4-dichlorophenol. Then, using natural lead-rich metal biochar/TiO2 material, photocatalysis combined with active sodium persulfate to degrade 2,4-dichlorophenol. The experimental results show that the combination of photocatalysis and activated sodium persulfate reaction can completely degrade 100 mg/L 2,4-dichlorophenol under UV light for 3 h, and the degradation efficiency is much higher than the sum of the two separate reactions. Quenching experiments show that SO4- • radicals play the most important role in the three free radicals (SO4- •, •OH and •O2- ) in the advanced oxidation combination system. Finally, the reaction mechanism of the two advanced oxidation combined systems are speculated.
Research on the Oretical Innovation and Design Method of the Integration of Highway and Toruism
Authors: Xing Yang , Sheng Yangzhi
Published: January 2021

Highway is an important carrier for the integration of transportation and tourism. At present, there are still some problems in the integration of highway transportation and tourism, such as unclear connotation, unclear thinking, inadequate understanding and incomplete measures. In order to better promote the integration development of Expressway and tourism t solve the problems encountered in the practice of various places, the advantages and disadvantages of the integration of Expressway and tourism are analyzed on the basis of a comprehensive review of the current development situation and needs of tourism and transportation industry. According to the basic characteristics of expressway, this paper innovatively puts forward the basic connotation, main characteristics, main contents and construction significance of expressway traffic integration. According to the requirements of the integration and development of tourism and transportation, this paper probes into the point-axis theory, circle theory and tourism flow theory related to tourism and transportation, and puts forward the application value of each theory in the field of tourism and transportation. Under the guidance of relevant theories, the main ideas of highway traffic integration, the basic elements and key design points of highway traffic integration are put forward. Comparing with the traditional expressway, the paper puts forward the main points of the route design of the tourist expressway, the main points of the interchange design of the tourist expressway which is different from the traditional expressway kilometers, the three types of the service area of the tourist expressway, and the four innovative design modes of the tourist Expressway sightseeing and recreation area. Combining with the relevant theories of tourism flow, this paper innovatively puts forward the traffic volume forecasting method of tourism expressway. Finally, from the land, capital and construction mode, the paper puts forward the guarantee measures of highway traffic integration.
Analysis of The Impact of Highway Construction Related to Social and Environment
Authors: Xiaofeng Luo , Siwei Liu , yue Yuan
Published: January 2021

According to the development practice of transportation construction in my country and related literature records, the existing domestic and foreign research on the promotion of transportation construction on the social and economic development and the negative impact on the ecological environment is analyzed, and it is provided a valid reference to exploring the ideas of green transportation construction and establishing a green road evaluation index system.