bluuebunny/crossref_metadata_2025 huggingface dataset:
Highly efficient all solution-processed non-doped deep-blue electroluminescent devices from oligocarbazole-end-capped spirobifluorenes
Authors: Therdkatanyuphong Pattarawadee , Kaiyasuan Chokchai , Chasing Pongsakorn , Kaewpuang Terdkait , Chawanpunyawat Thanyarat , Wongkaew Paweena , Sudyoadsuk Taweesak , Promarak Vinich
Published: September 2020

Oligocarbazole end-capped spirobifluorenes as non-doped deep-blue emissive layers in all solution-processed OLEDs exhibit one of the best all solution-processed deep-blue OLEDs reported to date.
Ruthenium(ii)-catalyzed [5 + 1] annulation reaction: a facile and efficient approach to construct 6-ethenyl phenanthridines utilizing a primary amine as a directing group
Authors: Chen Jian , Tang Baolan , Liu Xuexin , Lv Guanghui , Shi Yuesen , Huang Tianle , Xing Huimin , Guo Xiaoyu , Hai Li , Wu Yong
Published: September 2020

A ruthenium(ii)-catalyzed [5 + 1] annulation reaction between 2-arylanilines and cyclopropenones employing a free amine as a directing group has been developed.
Facile synthesis of flower-like hierarchical N-doped Nb2O5/C nanostructures with efficient photocatalytic activity under visible light
Authors: Qaraah Fahim A. , Mahyoub Samah A. , Hezam Abdo , Zhang Wei , Xiu Guangli , Munyaneza Janvier , Wu Chengzi
Published: September 2020

Flower-like hierarchical N-doped Nb2O5/C nanostructures with efficient visible light-driven photocatalytic activity synthesized via a facile hexamethylenetetramine-assisted hydrothermal route.
Reporter-recruiting bifunctional aptasensor for bioluminescent analytical assays
Authors: Davydova Anna , Krasitskaya Vasilisa , Vorobjev Pavel , Timoshenko Valentina , Tupikin Alexey , Kabilov Marsel , Frank Ludmila , Venyaminova Alya , Vorobyeva Mariya
Published: September 2020

A novel structure-switching bioluminescent 2′-F-RNA aptasensor consists of analyte-binding and obelin-recruiting modules, joined into a bi-specific aptamer construct.
A series of four novel alkaline earth metal–organic frameworks constructed of Ca(ii), Sr(ii), Ba(ii) ions and tetrahedral MTB linker: structural diversity, stability study and low/high-pressure gas adsorption properties
Authors: Almáši Miroslav , Zeleňák Vladimír , Gyepes Róbert , Zauška Ľuboš , Bourrelly Sandrine
Published: September 2020

Four novel microporous alkaline earth metal–organic frameworks (AE-MOFs) containing methanetetrabenzoate linker (MTB): UPJS-6, UPJS-7, UPJS-8 and UPJS-9 have been successfully prepared, characterized and tested as adsorbents for different gases.
Yttrium(iii) coordination polymer micro/nanospheres with single ligand and dual ligands
Authors: Ji Yanhua , Guo Qifeng , Yang Qingquan , Gao Yong , Yan Xiaojun , Liu Hongning , Zeng Zhijun
Published: September 2020

In this work, yttrium (III) coordination polymer (Y-CP) ball-flower-shaped microparticles with diameters ranging from 5 μm to 10 μm were synthesized using vanillin and asparagine as ligands under solvothermal conditions at 150 °C for 24 h.
Highly dispersed Pt nanoclusters supported on zeolite-templated carbon for the oxygen reduction reaction
Authors: Bera Raj Kumar , Park Hongjun , Ko Seung Hyeon , Ryoo Ryong
Published: September 2020

Electrochemically synthesized highly dispersed Pt nanoclusters (PtNCs) stabilized by the nanocages of zeolite-templated carbon (ZTC) exhibit excellent electrocatalytic performance toward the oxygen reduction reaction.
Carbon quantum dots derived from the extracellular polymeric substance of anaerobic ammonium oxidation granular sludge for detection of trace Mn(vii) and Cr(vi)
Authors: Liu Fengli , Li Huosheng , Liao Dandan , Xu Yanhong , Yu Mingxia , Deng Shengwen , Zhang Gaosheng , Xiao Tangfu , Long Jianyou , Zhang Hongguo , Li Yuting , Li Keke , Zhang Ping
Published: September 2020

Fluorescence detection of trace Mn(vii) or Cr(vi) by the CQDs prepared from anaerobic ammonium oxidation granular sludge.
The mechanism for CO2reduction over Fe-modified Cu(100) surfaces with thermodynamics and kinetics: a DFT study
Authors: Qiu Mei , Li Yi , Zhang Yongfan
Published: September 2020

The adsorption, activation and reduction of CO2over Fex/Cu(100) (x= 1–9) surfaces were examined by density functional theory.
Di-functional luminescent sensors based on Y3+ doped Eu3+ and Tb3+ coordination polymers: fast response and visible detection of Cr3+, Fe3+ ions in aqueous solutions and acetone
Authors: Liu Hongyan , Liu Yang , Meng Yu , Shi Xiaolei , Sun Junshan , Zhao Limin , Chen Diming , Hao Hongguo , Li Dacheng , Dou Jianmin , Han Jun
Published: September 2020

Two series of doped coordination polymers (EuxY1−x and TbxY1−x) through isomorphous substitution method utilizing Y3+ in place of partial Eu3+/Tb3+ were obtained. The doped materials could detect Fe3+, Cr3+, and acetone selectively and sensitively.
Correction: An efficient multicomponent synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles catalyzed by a magnetic nanoparticle supported Lewis acidic deep eutectic solvent
Authors: Nguyen Thanh Thi , Thi Le Ngoc-Phuong , Nguyen The Thai , Tran Phuong Hoang
Published: September 2020

Correction for ‘An efficient multicomponent synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles catalyzed by a magnetic nanoparticle supported Lewis acidic deep eutectic solvent’ by Thanh Thi Nguyen et al., RSC Adv., 2019, 9, 38148–38153, DOI: 10.1039/C9RA08074K.
Impact of the ammonia decomposition reaction over an anode on direct ammonia-fueled protonic ceramic fuel cells
Authors: Miyazaki Kazunari , Muroyama Hiroki , Matsui Toshiaki , Eguchi Koichi
Published: September 2020

The relation between the performance of direct ammonia-fueled SOFCs and the ammonia decomposition behavior over an anode was studied under various ammonia supply conditions.
Nanostructuring SnTe to improve thermoelectric properties through Zn and Sb co-doping
Authors: Kihoi Samuel Kimani , Lee Ho Seong
Published: September 2020

A complex microstructure resulting in SnTe based thermoelectric materials with improved properties in the mid temperature range.
Magnetorheology: a review
Authors: Morillas Jose R. , de Vicente Juan
Published: September 2020

Overview of magnetorheological materials, major characteristics, kinematics and modes of operation.
Residual stress distributions in amorphous solids from atomistic simulations
Authors: Ruscher Céline , Rottler Jörg
Published: September 2020

The distribution of local residual stresses that controls the properties of plastic flow in athermal amorphous solids is examined with atomistic simulations revealing that deviation from a pseudogap form appears after few percentages of deformation.
Charge regulation mechanism in end-tethered weak polyampholytes
Authors: Prusty D. , Nap R. J. , Szleifer I. , Olvera de la Cruz M.
Published: September 2020

In diblock polyampholyte brushes, the dissociation of acid and base monomers as a function of pH is simultaneously up and downregulated.
Defect engineering in photocatalysis: formation, chemistry, optoelectronics, and interface studies
Authors: Maarisetty Dileep , Baral Saroj Sundar
Published: September 2020

The potential role of defects in boosting the photocatalytic activity by tailoring optical, electronic and interface properties of semiconductor materials.
In situX-ray diffraction and X-ray absorption spectroscopy of electrocatalysts for energy conversion reactions
Authors: Chang Chia-Jui , Zhu Yanping , Wang Jiali , Chen Hsiao-Chien , Tung Ching-Wei , Chu You-Chiuan , Chen Hao Ming
Published: September 2020

This review summarizes the recent progress made in electrocatalysts with regard to oxygen evolution reaction, hydrogen evolution reaction, and CO2reduction reaction by means ofin situX-ray diffraction and X-ray absorption spectroscopy.
Improvement of the water oxidation performance of Ti, F co-modified hematite by surface modification with a Co(salen) molecular cocatalyst
Authors: Wang Ruiling , Kuwahara Yasutaka , Mori Kohsuke , Louis Catherine , Bu Yuyu , Yamashita Hiromi
Published: September 2020

A new system by combining Ti-doping and F-treatment in hematite modified with Co(salen) as a cocatalyst exhibits enhanced photoelectrochemical water oxidation performance.
Applications of nanomaterials for scavenging reactive oxygen species in the treatment of central nervous system diseases
Authors: An Zhen , Yan Jincong , Zhang Ye , Pei Renjun
Published: September 2020

Nanomaterials with excellent ROS-scavenging ability and biodistribution are considered as promising candidates in alleviating oxidative stress and restoring redox balance in CNS diseases, further facilitating the function recovery of the CNS.
Role of sialidase Neu3 and ganglioside GM3 in cardiac fibroblasts activation
Authors: Ghiroldi Andrea , Piccoli Marco , Creo Pasquale , Cirillo Federica , Rota Paola , D'Imperio Sara , Ciconte Giuseppe , Monasky Michelle M. , Micaglio Emanuele , Garatti Andrea , Aureli Massimo , Carsana Emma Veronica , Menicanti Lorenzo , Pappone Carlo , Anastasia Luigi
Published: September 2020

Cardiac fibrosis is a key physiological response to cardiac tissue injury to protect the heart from wall rupture. However, its progression increases heart stiffness, eventually causing a decrease in heart contractility. Unfortunately, to date, no efficient antifibrotic therapies are available to the clinic. This is primarily due to the complexity of the process, which involves several cell types and signaling pathways. For instance, the transforming growth factor beta (TGF-β) signaling pathway has been recognized to be vital for myofibroblasts activation and fibrosis progression. In this context, complex sphingolipids, such as ganglioside GM3, have been shown to be directly involved in TGF-β receptor 1 (TGF-R1) activation. In this work, we report that an induced up-regulation of sialidase Neu3, a glycohydrolytic enzyme involved in ganglioside cell homeostasis, can significantly reduce cardiac fibrosis in primary cultures of human cardiac fibroblasts by inhibiting the TGF-β signaling pathway, ultimately decreasing collagen I deposition. These results support the notion that modulating ganglioside GM3 cell content could represent a novel therapeutic approach for cardiac fibrosis, warranting for further investigations.
Protein kinase A negatively regulates VEGF-induced AMPK activation by phosphorylating CaMKK2 at serine 495
Authors: Spengler Katrin , Zibrova Darya , Woods Angela , Langendorf Christopher G. , Scott John W. , Carling David , Heller Regine
Published: September 2020

Activation of AMP-activated protein kinase (AMPK) in endothelial cells by vascular endothelial growth factor (VEGF) via the Ca2+/calmodulin-dependent protein kinase kinase 2 (CaMKK2) represents a pro-angiogenic pathway, whose regulation and function is incompletely understood. This study investigates whether the VEGF/AMPK pathway is regulated by cAMP-mediated signalling. We show that cAMP elevation in endothelial cells by forskolin, an activator of the adenylate cyclase, and/or 3-isobutyl-1-methylxanthine (IBMX), an inhibitor of phosphodiesterases, triggers protein kinase A (PKA)-mediated phosphorylation of CaMKK2 (serine residues S495, S511) and AMPK (S487). Phosphorylation of CaMKK2 by PKA led to an inhibition of its activity as measured in CaMKK2 immunoprecipitates of forskolin/IBMX-treated cells. This inhibition was linked to phosphorylation of S495, since it was not seen in cells expressing a non-phosphorylatable CaMKK2 S495C mutant. Phosphorylation of S511 alone in these cells was not able to inhibit CaMKK2 activity. Moreover, phosphorylation of AMPK at S487 was not sufficient to inhibit VEGF-induced AMPK activation in cells, in which PKA-mediated CaMKK2 inhibition was prevented by expression of the CaMKK2 S495C mutant. cAMP elevation in endothelial cells reduced basal and VEGF-induced acetyl-CoA carboxylase (ACC) phosphorylation at S79 even if AMPK was not inhibited. Together, this study reveals a novel regulatory mechanism of VEGF-induced AMPK activation by cAMP/PKA, which may explain, in part, inhibitory effects of PKA on angiogenic sprouting and play a role in balancing pro- and anti-angiogenic mechanisms in order to ensure functional angiogenesis.
Meta-analysis of the clinicopathological significance of miRNA-145 in breast cancer
Authors: Lv Peng , Zhang Zhenzhu , Hou Li , Zhang Yayue , Lu Lingeng , Wang Chong , Shi Fengqin
Published: September 2020

Low expression of tumor suppressor microRNA (miRNA) and high expression of carcinogenic miRNA promote the occurrence and progression of human cancer. Most studies show that miR-145 is a tumor suppressor miRNA, and is closely related to the clinicopathology of breast cancer. However, the results are still inconsistent. Therefore, we conducted a meta-analysis on the basis of eligible studies to summarize the possible correlation between miR-145 and the clinicopathology and prognosis of breast cancer. Using PubMed, Embase, Web of Science, Wanfang and CNKI, we searched all published papers written in either English or Chinese on miR-145 expression in breast cancer from 1990 to November 2019 for meta-analysis. We used standardized mean difference (SMD) to evaluate the differential expression of miR-145 in breast cancer tissues and adjacent normal tissues or normal breast tissues. We found that miR-145 expression was significantly lower in breast cancer tissues than that in adjacent normal tissues (SMD = −2.93, P<0.0001) and in healthy women (SMD = −0.52, P=0.009). miR-145 expression was lower in breast cancer patients with ER-positive (SMD = 0.65, P<0.001), HER-2-positive (SMD = −1.04, P<0.001), compared with their counterparts, respectively. In addition, breast cancer patients with low expression of miR-145 had larger tumor diameters (SMD = −1.97, P<0.001) and lymph node metastasis (SMD = −1.75, P<0.001) that are unfavorable prognostic factors. Conclusion: Low miR-145 is observed in breast cancer, which is closely related to molecular subtypes and unfavorable factors of breast cancer. These findings indicate that miR-145 is tumor suppressor miRNA, and may be a potential diagnostic and prognostic marker in breast cancer.
Dynamically important magnetic fields near the event horizon of Sgr A*
Authors:   GRAVITY Collaboration, Jiménez-Rosales A. , Dexter J. , Widmann F. , Bauböck M. , Abuter R. , Amorim A. , Berger J. P. , Bonnet H. , Brandner W. , Clénet Y. , de Zeeuw P. T. , Eckart A. , Eisenhauer F. , Förster Schreiber N. M. , Garcia P. , Gao F. , Gendron E. , Genzel R. , Gillessen S. , Habibi M. , Haubois X. , Heißel G. , Henning T. , Hippler S. , Horrobin M. , Jochum L. , Jocou L. , Kaufer A. , Kervella P. , Lacour S. , Lapeyrère V. , Le Bouquin J.-B. , Léna P. , Nowak M. , Ott T. , Paumard T. , Perraut K. , Perrin G. , Pfuhl O. , Rodríguez-Coira G. , Shangguan J. , Scheithauer S. , Stadler J. , Straub O. , Straubmeier C. , Sturm E. , Tacconi L. J. , Vincent F. , von Fellenberg S. , Waisberg I. , Wieprecht E. , Wiezorrek E. , Woillez J. , Yazici S. , Zins G.
Published: September 2020

We study the time-variable linear polarisation of Sgr A* during a bright near-infrared flare observed with the GRAVITY instrument on July 28, 2018. Motivated by the time evolution of both the observed astrometric and polarimetric signatures, we interpret the data in terms of the polarised emission of a compact region (“hotspot”) orbiting a black hole in a fixed, background magnetic field geometry. We calculated a grid of general relativistic ray-tracing models, created mock observations by simulating the instrumental response, and compared predicted polarimetric quantities directly to the measurements. We take into account an improved instrument calibration that now includes the instrument’s response as a function of time, and we explore a variety of idealised magnetic field configurations. We find that the linear polarisation angle rotates during the flare, which is consistent with previous results. The hotspot model can explain the observed evolution of the linear polarisation. In order to match the astrometric period of this flare, the near horizon magnetic field is required to have a significant poloidal component, which is associated with strong and dynamically important fields. The observed linear polarisation fraction of ≃30% is smaller than the one predicted by our model (≃50%). The emission is likely beam depolarised, indicating that the flaring emission region resolves the magnetic field structure close to the black hole.
A novel CMB polarization likelihood package for large angular scales built from combined WMAP and Planck LFI legacy maps
Authors: Natale U. , Pagano L. , Lattanzi M. , Migliaccio M. , Colombo L. P. , Gruppuso A. , Natoli P. , Polenta G.
Published: September 2020

We present a cosmic microwave background (CMB) large-scale polarization dataset obtained by combining Wilkinson Microwave Anisotropy Probe (WMAP) in the K, Q, and V bands with the Planck 70 GHz maps. We employed the legacy frequency maps released by the WMAP and Planck collaborations and performed our own Galactic foreground mitigation technique, relying on Planck 353 GHz for polarized dust and on Planck 30 GHz and WMAP K for polarized synchrotron. We derived a single, optimally noise-weighted, low residual foreground map and the accompanying noise covariance matrix. These are shown through χ2 analysis to be robust over an ample collection of Galactic masks. We used this dataset, along with the Planck legacy Commander temperature solution, to build a pixel-based low-resolution CMB likelihood package, whose robustness we tested extensively with the aid of simulations, finding an excellent level of consistency. Using this likelihood package alone, we are able to constrain the optical depth to reionization, τ = 0.069−0.012+0.011 at 68% confidence level, on 54% of the sky. Adding the Planck high-ℓ temperature and polarization legacy likelihood, the Planck lensing likelihood, and BAO observations, we find τ = 0.0714−0.0096+0.0087 in a full ΛCDM exploration. The latter bounds are slightly less constraining than those obtained by employing the Planck High Frequency Instrument’s (HFI) CMB data for large-angle polarization, which only include EE correlations. Our bounds are based on a largely independent dataset that includes TE correlations. They are generally compatible with Planck HFI, but lean towards slightly higher values for τ. We have made the low-resolution Planck and WMAP joint dataset publicly available, along with the accompanying likelihood code.
Comparison of the access level of new energy between domestic and foreign power grid
Authors: Yuan Wei , Wang Caixia , Ye Xiaoning , Li Qionghui , Xu Liang , Shi Zhiyong , Li Ziqian
Published: September 2020

In the background of energy transformation, the world has witnessed the rapid development of new energy generation, with the proportion of capacity and electricity continuously increasing. However, different countries and regions have great differences in the access level of new energy. When a high proportion of new energy is connected to the system, it is neither scientific nor reasonable to reflect the development and absorption level of new energy only by such indicators as the proportion of new energy installed and the proportion of electricity generated. This paper analyzes the development status of new energy at home and abroad, and constructs the evaluation index system of the access level of new energy in power grid. Based on the evaluation index system, the access levels of new energy in different countries and regions are compared and analysed. At last, several key issues that need to be solved to achieve the goal of high proportion of new energy access in China are put forward.
Exploration on Prediction and Early Warning Technology for Investment Completion of 10 kV And Below Power Grid Infrastructure Projects
Authors: Ma Lei , Wen Fan , Huang Jian , Pan Xia , Xu Feifei , Xu Wenjun , Shi Jinping
Published: September 2020

The external severe and complex economic situation has a great impact on the efficiency of the company’s investment implementation. The in-depth implementation of the lean investment management concept also puts forward new requirements for improving the extensive distribution network investment management mode. In addition, in recent years, the proportion of investment in distribution network projects of 10kV and below has increased, and its management mode is difficult to keep up with the new investment management requirements. Therefore, this project takes the infrastructure projects of 10kV and below as the research object, constructs the investment plan curve by studying the business rules of construction, accounting and materials, and deepens its application in the early warning of investment plan implementation based on the investment plan line, and provides an effective support tool for the investment lean management and control of distribution network.
Research on Construction Risk Evaluation of EPC Project of Transmission and Distribution Engineering Based on Design Enterprise
Authors: Zhongze Zhao , Qichen Meng , Nansheng Pang
Published: September 2020

The EPC general contracting model of power transmission and transformation projects consisting of design, procurement and construction has gradually been favored by the owners in recent years. Among the EPC general contractors, design institutes often occupy a leading position by virtue of their design advantages, but they are inferior in construction management, and there are many construction risk factors. In this paper, the potential risks in the construction phase are stripped out, combined with the characteristics of power transmission and transformation projects, the risk identification system is established, based on the gray whitening weight function, the fuzzy comprehensive evaluation method is used to evaluate the construction risk of the EPC project of the power transmission and transformation project led by the design enterprise.
Infrared image-based detection method of electrical equipment overheating area in substation
Authors: Fan Songhai , Li Tianyu , Liu Yicen , Gong Yiyu , Yu Kunjian
Published: September 2020

For the detection of overheated areas of electrical equipment, in order to accurately segment out the overheated areas and reduce the fault detection range, this paper proposes a new overheated area detection algorithm. Firstly, the Ostu algorithm is used to remove the background and segment the general area of the electrical equipment area; secondly, the active contour model is used to refine the edge of the target area to remove the redundant edge points; finally, FCM clustering algorithm is used to suppress over segmentation and accurately divide the overheated area. The experiment proves that the algorithm can accurately divide the overheated area, and has certain practical value.
Design of AR Inspection System for Protection Equipment of Intelligent Substation
Authors: Liu Yuming , Yang Shucheng , Guan Wenyan , Han Zhe , Qian Yangdong
Published: September 2020

According to the requirements of on-site inspection for protection equipment in intelligent substation, combined with spatial anchor, an AR inspection system with man in the loop and virtual reality integration is proposed based on the augmented reality technology. The overall design is carried out from multiple dimensions such as system architecture, business functions, business processes and network topology, and the technical methods and key technology implementation methods such as target recognition, spatial positioning, and near-eye display are elaborated in detail, the implementation of inspection task is verified by field application from macro and micro scales. The system realizes the enhanced display of real equipment in physical space and various equipment status, monitoring data, operation and maintenance information in virtual space, assists personnel to carry out inspection activities such as inspection route navigation, equipment location, inspection operation and process record, improves the patrol quality, efficiency and upgrade methods, it has important application value.
A review of traction battery model and parameter identification in electric vehicle
Authors: Wang Chunyang , Xing Bo , Zhou Jiaping
Published: September 2020

State estimation is a key issue of battery management system (BMS) to improve the energy utilization of traction battery in electric vehicle, which is usually achieved based on battery model. The commonly used models, equivalent circuit model (ECM) and electrochemical mechanism-based model (EMM), are reviewed in this paper. Besides, the corresponding parameter identification methods are analysed considering the target application background.
Ultra-short-time prediction technology of wind power station output based on variational mode decomposition and particle swarm optimization least squares vector machine
Authors: Shen Runjie , Hua Danqiong , Wang Yiying , Xing Ruimin , Ma Min
Published: September 2020

Wind power is developing rapidly in the context of sustainable development, and a series of problems such as wind curtailment and power curtailment have gradually emerged. The forecast of power generation output has become one of the hotspots of current research. This paper proposes a wind power plant output ultra-short-time prediction technology based on variational modal decomposition and particle swarm optimization least squares vector machine. Variational Modal Decomposition (VMD) method decomposes the historical output data of wind power plants at multiple levels. At the same time, it explores the impact of various decomposition methods such as EMD decomposition on the prediction accuracy, and uses the least squares support vector machine based on particle swarm optimization algorithm. Predictive summation is performed on each level of data separately to obtain a more accurate prediction effect, which has a certain improvement in prediction accuracy compared with traditional prediction algorithms.
Constraint Satisfied Model Predictive Control Strategy for MMC Energy Storage System Based on Super Capacitor
Authors: Yin Shi , Li Guanjun , Liu Zhong , Tao Yibin
Published: September 2020

With the continuous development of power electronics technology and the large-scale access of new energy power generation, the stable operation of the power grid is facing huge challenges. The MMC energy storage system has attracted more and more attention due to its strong ability to support the grid. However, the MMC energy storage system has a complex structure and contains many devices, and the research on high-performance control technology has always been a difficult point. In response to the above problems, this article proposes a constraint satisfaction model predictive control method for MMC energy storage system based on super capacitor. In the article, the operation mechanism of MMC energy storage system is analyzed, and the discrete domain mathematical model of MMC-ESSC is established. The article studies the prediction method of the future internal and external variables of the system, the rolling optimization mechanism and the method of establishing the objective function, and finally carries on the experiments verification. The analysis of experimental results shows that proposed control technology has high dynamic characteristics and efficiency.
Research and analysis on defect detection of semi-conductive layer of high voltage cable
Authors: Liu Sanwei , Zhang Jun , Xie Yi , Duan Jianjia , Huang Fuyong , Duan Xiaoli , Zeng Zeyu
Published: September 2020

As a component of the Internet of things, high-voltage cables are the power supply infrastructure for the modern development of cities. The operation experience shows that the high-voltage cable has been broken down many times due to the defective operation. At present, due to the limitation of detection technology, the research on detection and identification of defects in high-voltage cables is progressing slowly. Therefore, a new DR technology based on X-ray digital imaging is proposed in this paper to realize real-time detection of defects in the semi-conductive buffer layer of high-voltage cables, and intelligent detection of DR images of high-voltage cables by using image depth processing technology to realize intelligent identification of defects in the buffer layer of power cables. The results show that using the new DR technique proposed in this paper, the accurate and intuitive DR image of high-voltage cable can be obtained quickly, and the intelligent identification of defects can be realized.
Discussion of the relationship between failure and fire of valve regulated lead acid battery
Authors: Li Zhenyu , Wang Zhongjie , Wang Liang
Published: September 2020

Failure modes of the valve regulated lead acid battery will not only greatly reduce the service life, but also may start a fire. This paper reviews the relationship between battery fire and failure modes. Four failure modes influenced on the valve regulated lead acid battery were emphatically analyzed: “Sulfation of negative electrode plate”, “corrosion of the positive electrode plate”, “loss of water” and “acid leak”. The direct reasons for battery fire are thermal runaway, short circuit and hydrogen explosion, which were inducing by battery failure. A fire prevention scheme was proposed on the basis of above thesis.
Study on High Performance Control of the Machine-Side Converter of Doubly-Fed Turbines under Grid Distortion
Authors: Qi Huanruo , Zheng Ningkang , Yan Xiangyang , Kang Yilong
Published: September 2020

Two control strategies of DFIG under grid distortion are firstly summarized, namely, the control strategy of PI-R current controller based on dq reference frame and the control strategy of PI current controller based on the multiple rotating dq reference frame, and their advantages and disadvantages are analysed. On the basis of dynamic modelling of DFIG under grid distortion, in view of the defect that DFIG coupling is not considered in the control strategy of PI-R current controller based on dq reference frame, an improved control strategy considering motor coupling is proposed. In the end, the modelling and simulation of the unimproved and improved control strategies of PI-R current controller based on dq reference frame are carried out, and the simulation results verified the effectiveness of the improved control strategy.
Research on modeling of electric power transaction process based on block chain technology
Authors: Hao Qingli , Yin Guolong , Xu Pengtao , Zhang Chao , Ma Xiaozhen , Zhang Jing , Yan Yongbing , Tian Hongjie
Published: September 2020

Block chain technology is one of the optional technologies for the realization of intelligent power transactions on the residential side, and the specific transaction process is lacking research. Based on the composition of the block chain and its technical characteristics, this paper proposes a typical transaction flow for market participants in the electricity transaction under the environment of the residential side open electricity market based on block chain technology. According to the needs of power trading, the power trading using block chain technology is divided into 7 steps and abstracted separately. Finally, the power transaction based on block chain technology is analyzed, and the transaction process is further explained in combination with the case, which provides a reference for the introduction of new technologies for the design of ubiquitous power internet of things power transactions.
Optimization Design for Ocean Wave Energy Convertor
Authors: Liu Na , Tan Yimin , Mo Weiqiang , Han Huanqing , Li Lin
Published: September 2020

Establishing a theoretical model for Ocean Wave Energy Convertor in advance is a necessary step during studying the energy harvesting of ocean wave which can save the engineering cost and improve research efficiency. Since low energy conversion efficiency existed in wave energy convertor when capturing ocean wave energy, the mechanism of slotless Halbach linear generator which can optimize the magnetic field distribution of the generator is adopted as the secondary energy conversion devices to solve the problem. The magnetic vector potential theory is introduced to analysis the topology of Halbach linear generator, then expressions of the generator’s performance have been deduced. Hence, the analysis model of the Halbach linear generator has been settled. To obtain the global optimal solution, the simulated annealing algorithm has been used to slove that derived model. Then a series of linear generator’s design parameters are fixed, which include dimensions of permanent magnets and winding coils. The error of linear generator’s peak power between analytical solution results and simulation results is about 3.6%. The experiment result demonstrates that maximum output power of optimized Halbach linear generator reaches 570w.
A New Method to Experimentally Investigate Local Pressure Loss of Oil-Water Two-Phase Flow through Pore Throats
Authors: Liu Dongxu , Huang Na , Liu Lei
Published: September 2020

To investigate the resistance performance of pore throats in porous media, a new method was used to conduct experiments to indirectly measure the local pressure loss of single-phase water and oil- water two-phase flow through pore-throat structures. Four microchannels were designed and manufactured with MEMS technology. One of the four microchannels is a straight duct with no throat and each of the other three has one throat within the passage. By comparison of total pressure drops between the straight duct with no throat and the channel with a throat at the same flow rate, the local pressure loss over a pore- throat structure can be determined. In this paper, the pore-throat structure is defined as a combination of a contraction, an expansion and a throat to stimulate the pore throat in porous media. Experimental results show that local pressure loss, nonlinear with the flow rate, grows up with the decrease of throat size and the increase of oil volume fraction. Local loss coefficient, characterizing the local resistance performance of pore-throat structure, diminishes with the increase of Reynolds number. Reynolds number (in throat part) is in the range of 100-1100. A new empirical correlation of local loss coefficient is proposed for single-phase water and oil-water two-phase flow through pore-throat structure.
Numerical study of the aerodynamic characteristics around typical terrain with different temperature
Authors: Huai Xiaowei , Li Li , Guo Jun , Wu Shifeng , Jian Zhou
Published: September 2020

The distributions of near-surface meteorological elements, such as wind, are greatly affected by the terrain underneath, which makes the power structure of micro geomorphic area more vulnerable to the influence of local climate. Single hills with length are one of typical terrains in microrelief. In this paper, the circulation caused by buoyant flows and temperate within typical single hilly terrain with length is studied. The Detached Eddy Simulation (DES) is used to integrate buoyancy, turbulence and micro-terrain into a single model and it is applied to the special situation of micro-terrain climate. How the wind field is influ-enced by different surface temperature and the model surface roughness is carefully described. The results show that, different surface temperature has a very strong effect on the speedup ratio. Compared with the air temperature, the lower the terrain surface temperature is, the more obvious the speedup ratio effect is, and vice versa. For different roughness surface terrain, the speedup ratio has almost the same characteristics.
Optimization for the cathodic protection system based on numerical simulation
Authors: Zeng Weiguo , Xu Dongxiao , Wang Hao , Yang Yong , Wang Hongmei
Published: September 2020

Cathodic protection was one of important method for the corrosion prevention. With the expand of pipeline at Jingbian gas field, the cathodic protection system had been not qualified for the corrosion prevention of pipeline at Jingbian gas field. The results of survey for pipeline in 2018 years suggested that there were less-protection or over-protection for the corrosion prevention of pipeline. In this study, it was simulated by the COMSOL software to clear the regulation of current for pipeline in different cathodic protection area, and learn the overall situation of cathodic protection station in Jingbian gas field. Finally, optimizing the cathodic protection system for improving the effect by cathodic protection and ensuring the safety production.
Hypersensitivity Pneumonitis: Perspective in Diagnosis and Pathology
Authors: Xia Shijia
Published: September 2020

Hypersensitivity pneumonitis (HP) is the excessive immune response in the lung parenchyma (alveoli, terminal bronchiole, interstitium), resulting from repeated exposure to a variety of antigens. From the clinical point of view, HP can be divided into acute, subacute, or chronic forms. Only few of the exposed individuals develop HP, but workers in environments contaminated by organic dust are at a higher risk. The pathogenesis of HP is complex and still under investigation. Previous research suggests that both type III and IV hypersensitivity reactions are involved. The main treatment is the removal of antigen. Therefore, research of causative agents and pathogenesis is of outstanding importance not only for early diagnosis but also the better treatment of HP.
Effect of Huoxuejiangu Decoction on Osteoarthritis
Authors: He Zike , He Kaifei , Wang Shangzeng
Published: September 2020

Objective: To explore the clinical intervention effect of applying Huoxue Jiangu Decoction in the treatment of patients with osteoarthritis. Methods: Research work was carried out in our hospital from December 2018 to December 2019. A total of 100 patients with osteoarthritis received treatment during this period were selected and divided into two groups using random number method. One group was given sodium hyaluronate injection for treatment, which was the control group, and the other group was given Huoxuejiangu Decoction combined with sodium hyaluronate injection, which was the experimental group. The clinical treatment of the two groups of patients was compared and analyzed. Results: The patients' pain levels were compared. There was no significant difference between the groups before the intervention treatment. After treatment, the experimental group score was (3.05±0.55), which was lower than the control group, the improvement effect was more significant, and the difference between the groups was significant (P< 0.05), the experimental group had a better effect. The clinical treatment of the two groups of patients was compared and analyzed. There was no significant difference in the WOMAS index between the two groups before treatment. After treatment, the score of the experimental group was (34.33±6.98), and the improvement rate was (37.45±13.22). After treatment, the score was lower and the improvement rate was higher, which was significantly higher than the control group (P <0.05), which was significant. The treatment effective rate of the patients in the experimental group was 80.00%, and the treatment effective rate of the patients in the control group was 64.00%. When comparing, the effective rate of the experimental group was higher, and the data comparison between the groups was significantly different. Conclusion: For the patients with osteoarthritis, the application of Huoxue Jiangu Decoction has a significant clinical effect, which can reduce the patient's pain level, improve the patient's clinical symptoms, have high clinical value, and it can be promoted.
The Influence of Lactic Acid Bacteria from Xinjiang Traditional Fermented Yogurt on Antioxidation of Geniposide in vitro
Authors: Xue Rui , Wang Mei , Liu Dengqiu , Zhao Xin , Liu Bihui
Published: September 2020

To investigate the influence of lactic acid bacteria on the antioxidant effect of geniposide in vitro, seven strains of lactic acid bacteria were isolated from natural fermented yoghurt from Xinjiang, China. Lactic acid bacteria, geniposide and their mixtures were used separately to evaluate the antioxidant effect through detecting the scavenging activity of 1,1-diphenyl-2-trinitrophenylhydrazine (DPPH), Hydroxyl free radicals and 2, 2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS). The results showed that, compared with the group that geniposide separately used, the strains numbered x70-1, x70-2, x70-3, x70-4 and x70-5, combined with geniposide had more remarkable antioxidant effect, while the other two strains (numbered x43-2 and x43-3)combined with geniposide showed low oxidation resistance. These results may provide a potential method to promote antioxidant effect of geniposide.
Selective Production of Aromatic Aldehydes by Stepwise Degradation of Typical Eight Landscaping Biomass Waste: Effect of Reaction Temperature and Time
Authors: Nie Siyu , Cao Leichang
Published: September 2020

Greening waste presents considerable reuse potential owing to its simple organic composition. For greening waste, being simply regarded as ordinary garbage cannot adapt to the requirements of sustainable and harmless development. Resource reusing process is an inevitable trend. Utilization of urban landscape greening waste is of great significance for improving the ecological environment in urban and rural areas, building a harmonious city, increasing employment, and enhancing economic efficiency. This will be a far-reaching impact on China's economic and social sustainable development. In this work, eight typical landscape plants were selected as raw materials using the batch reactor. The concept of stepwise hydrothermal conversion and a real model with xylose, cellulose acetate (CA), and aromatic aldehyde as the target products were thereby constructed. In the third step of the stepwise conversion, the effect of reaction temperature and time in the oxidative degradation of cellulose acetate solid residues in NaOH solution to produce aromatic aldehyde was investigated. The optimum conditions were obtained as 175 ℃ and 90 min. The yield of aromatic aldehydes in all 16 branches and leaves of cellulose acetate all reached about 20% under the optimal conditions.
Study of Oil-Water Two-Phase Stratified Flow in Horizontal Fractures
Authors: Huang Na , Liu Dongxu , Sun Yuhan , Liu Lei
Published: September 2020

The relative permeability of oil-water two-phase flow is an important parameter in fractured petroleum reservoirs. It is widely accepted that the sum of relative permeabilities is less than 1. In this study, a series of experiments have been conducted on six rectangular fractures for oil-water two-phase flows. Analytical investigations of the effects of flow rate, aspect ratio, and fracture size on the relative permeability of oil-water two-phase are analysed. Basic fluid flow equations are combined to develop a new analytical model for water-oil two-phase flow in a horizontal fracture. The simulation results predicted by this model are in good agreement with the experimental data. The relative permeability is a function of flow ratio, viscosity ratio, aspect ratio and saturation. It increases as aspect ratio increases if the fracture depths are the same, while it decreases as aspect ratio increases if the fracture widths are identical. Both experiment and model indicate that the sum of relative permeabilities of oil and water is greater than 1 in some cases, different from the accepted view.
Novel red-emitting Lu3Te2Li3O12: Eu3+ phosphor with high color purity for n-UV WLEDs
Authors: Qu Mingyang , Zhang Xiyan , Mi Xiaoyun , Liu Quansheng , Xu Shaoqiu
Published: September 2020

In this work, a series of red emitting Lu3Te2Li3O12: Eu3+ phosphors were synthesized for the first time by high temperature solid state reaction. The structure was characterized by X-ray diffraction. The excitation spectra, emission spectra and CIE chromaticity coordinate were studied. The phosphors show strong red emission at 611 nm due to the 5D0-7F2 transition of Eu3+ ions. The optimal doping concentration of Eu3+ in LTL host is x = 0.5 due to the concentration quenching mechanism of dipole-dipole interaction. The CIE chromaticity coordinates of the LTL: 0.5Eu3++ phosphor is (0.644,0.355), and the purity of the color is up to 93.61%. The phosphor can be considered as a potential red-emitting candidate for near UV WLEDs.
Wie bewerten Versicherte unterschiedliche Ausgestaltungen der
medizinischen Rehabilitation?
Authors: Spies Maren , Kulisch Kristina , Streibelt Marco , Pohl Almut , Schulz Holger , Brütt AnnaLevke
Published: September 2020

Ziel der Studie Ziel war es, Sichtweisen von Versicherten der DRV Bund zu
verschiedenen Formen der medizinischen Rehabilitation zu erheben.

Methodik In 10 Fokusgruppen diskutierten die Teilnehmer (n = 78,
65% weiblich, M= 52,2 Jahre) die Vor- und Nachteile
verschiedener Formen der medizinischen Rehabilitation (stationär,
ambulant, berufsbegleitend, Fallmanagement). Im Mittelpunkt standen
organisatorische Rahmenbedingungen (Wohnortnähe, Zeitrahmen, Vernetzung
mit anderen Akteuren). Die Transkripte wurden zusammen mit einer
ergänzenden Online-Befragung qualitativ ausgewertet (Mayring, 2008).

Ergebnisse Die Herauslösung aus dem Alltag ist für viele
Teilnehmer Voraussetzung, um sich auf eine Rehabilitation konzentrieren zu
können. Bei der ambulanten Rehabilitation könnten sich die
wahrgenommene geringere Betreuungsintensität und Mehrfachbelastung
negativ auswirken. Die Passung zwischen Reha-Form und den Bedürfnissen
des Rehabilitanden ist laut der Befragten entscheidend.

Diskussion Die qualitative Bewertung aus Versichertenperspektive kann
genutzt werden, um die Gestaltung von Reha-Angeboten der DRV stärker an
den Bedürfnissen der Versicherten auszurichten.
Von der traditionellen Anwendung zur rationalen Phytotherapie: Phytochemische Analyse und prä-klinische Untersuchungen zur antimikrobiellen Wirkung von Blätterextrakten von Combretum collinum Fresen.
Authors: Marquardt Peter , Vissiennon Cica , Ahyi Virgile , Fester Karin
Published: September 2020

In der Zone südlich der Sahara gibt es etwa 7000 verschiedene Pflanzenarten, die ein großes Potenzial haben, zur Ernährungs- und Gesundheitsversorgung der 1,2 Milliarden Einwohner dieser Region beizutragen. Besonders in Benin, einem Staat in Westafrika, sind Heilpflanzen eine wichtige natürliche Ressource, die 80–99 % der Bevölkerung mindestens als ergänzende, wenn nicht sogar als primäre medizinische Grundversorgung nutzen. Blätter von Combretum collinum Fresen. (Combretaceae) werden in der traditionellen westafrikanischen Medizin zur Behandlung bakterieller Infektionen und zur Förderung der Wundheilung eingesetzt. Die vorliegende Untersuchung konzentriert sich auf die phytochemische Charakterisierung und die Analyse der antimikrobiellen Aktivität eines 50 % EtOH-Blattextraktes von C. collinum. Untersuchungen zur antimikrobiellen Aktivität wurden mit Agar-Well-Diffusions- und Mikrodilutionstests durchgeführt. Die phytochemische Charakterisierung erfolgte mit verschiedenen chromatographischen und spektroskopischen Methoden (HPLC, LC-MS, Flash-Chromatographie, 1 H-NMR). Die Untersuchungen bestätigten Myricetin-3-O-rhamnosid und Myricetin-3-O-glucosid als polyphenolische Hauptinhaltsstoffe des 50 % EtOH-Blattextraktes von C. collinum. Im Agar-Well-Diffusionstest zeigte der Extrakt die größten Hemmhöfe gegen S. epidermidis, MRSA und S. aureus. Im Mikrodilutionstest wies der Extrakt durchschnittliche Hemmkonzentrationen von 275,0 µg/ml für S. epidermidis und 385,5 µg/ml für MRSA auf. Der Nachweis der antibakteriellen Aktivität liefert einen deutlichen Hinweis für den möglichen Nutzen der topischen Anwendung von Extrakten aus C.-collinum-Blättern in der traditionellen westafrikanischen Medizin. Die ethnomedizinische Verwendung bietet somit eine alternative Behandlungsoption für topische Infektionen durch Staphylococcus-Arten.