bluuebunny/crossref_metadata_2025 huggingface dataset:
SPOP–PTEN–SUFU axis promotes progression of clear cell renal cell carcinoma via activating SHH and WNT pathway
Authors: Han Bo’ang , Sun Zhen , Yu Tingting , Wang Yu , Kuang Lun , Li Tianyuan , Cai Jing , Cao Qing , Xu Yuan , Gao Binbin , Cheng Steven Y. , Yue Shen , Liu Chen
Published: May 2021

Although E3 ligase Speckle type BTB/POZ protein (SPOP) promotes tumorigenesis by acting as a key regulatory hub in clear cell renal cell carcinoma (ccRCC), the detailed molecular mechanism remains unclear. Here, we demonstrate that a well-known tumor suppressor, Suppressor of Fused (SUFU), is downregulated by SPOP. Interestingly, this downregulation depends on cullin-3(Cul3)-SPOP E3 ligase, but SUFU is not a direct substrate of SPOP. Phosphatase and tensin homolog (PTEN), a ubiquitinated substrate of SPOP, is involved in SPOP-mediated SUFU reduction. Importantly, inhibition of SUFU leads to elevated SHH and WNT signaling, consequently rescuing the reduced proliferation, migration, and invasion abilities of ccRCC cells caused by SPOP-knockdown. Moreover, combinatorial treatment with SHH and WNT inhibitors shows more effective for suppressing ccRCC cell proliferation and aggressiveness. These findings demonstrate that a novel SPOP–PTEN–SUFU axis promotes ccRCC carcinogenesis by activating SHH and WNT pathway, providing a new treatment strategy for ccRCC.
Strong spin-orbit coupling inducing Autler-Townes effect in lead halide perovskite nanocrystals
Authors: Yumoto Go , Hirori Hideki , Sekiguchi Fumiya , Sato Ryota , Saruyama Masaki , Teranishi Toshiharu , Kanemitsu Yoshihiko
Published: May 2021

Manipulation of excitons via coherent light-matter interaction is a promising approach for quantum state engineering and ultrafast optical modulation. Various excitation pathways in the excitonic multilevel systems provide controllability more efficient than that in the two-level system. However, these control schemes have been restricted to limited control-light wavelengths and cryogenic temperatures. Here, we report that lead halide perovskites can lift these restrictions owing to their multiband structure induced by strong spin-orbit coupling. Using CsPbBr3 perovskite nanocrystals, we observe an anomalous enhancement of the exciton energy shift at room temperature with increasing control-light wavelength from the visible to near-infrared region. The enhancement occurs because the interconduction band transitions between spin-orbit split states have large dipole moments and induce a crossover from the two-level optical Stark effect to the three-level Autler-Townes effect. Our finding establishes a basis for efficient coherent optical manipulation of excitons utilizing energy states with large spin-orbit splitting.
Analogical discovery of disordered perovskite oxides by crystal structure information hidden in unsupervised material fingerprints
Authors: Ihalage Achintha , Hao Yang
Published: May 2021

Compositional disorder induces myriad captivating phenomena in perovskites. Target-driven discovery of perovskite solid solutions has been a great challenge due to the analytical complexity introduced by disorder. Here, we demonstrate that an unsupervised deep learning strategy can find fingerprints of disordered materials that embed perovskite formability and underlying crystal structure information by learning only from the chemical composition, manifested in $$({{\rm{A}}}_{1-{\rm{x}}}{{\rm{A}}^{\prime} }_{{\rm{x}}}){{\rm{BO}}}_{3}$$

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formulae. This phenomenon can be capitalized to predict the crystal symmetry of experimental compositions, outperforming several supervised machine learning (ML) algorithms. The educated nature of material fingerprints has led to the conception of analogical materials discovery that facilitates inverse exploration of promising perovskites based on similarity investigation with known materials. The search space of unstudied perovskites is screened from ~600,000 feasible compounds using experimental data powered ML models and automated web mining tools at a 94% success rate. This concept further provides insights on possible phase transitions and computational modelling of complex compositions. The proposed quantitative analysis of materials analogies is expected to bridge the gap between the existing materials literature and the undiscovered terrain.
A deep convolutional neural network for real-time full profile analysis of big powder diffraction data
Authors: Dong Hongyang , Butler Keith T. , Matras Dorota , Price Stephen W. T. , Odarchenko Yaroslav , Khatry Rahul , Thompson Andrew , Middelkoop Vesna , Jacques Simon D. M. , Beale Andrew M. , Vamvakeros Antonis
Published: May 2021

We present Parameter Quantification Network (PQ-Net), a regression deep convolutional neural network providing quantitative analysis of powder X-ray diffraction patterns from multi-phase systems. The network is tested against simulated and experimental datasets of increasing complexity with the last one being an X-ray diffraction computed tomography dataset of a multi-phase Ni-Pd/CeO2-ZrO2/Al2O3 catalytic material system consisting of ca. 20,000 diffraction patterns. It is shown that the network predicts accurate scale factor, lattice parameter and crystallite size maps for all phases, which are comparable to those obtained through full profile analysis using the Rietveld method, also providing a reliable uncertainty measure on the results. The main advantage of PQ-Net is its ability to yield these results orders of magnitude faster showing its potential as a tool for real-time diffraction data analysis during in situ/operando experiments.
Environment-assisted bosonic quantum communications
Authors: Pirandola Stefano , Ottaviani Carlo , Jacobsen Christian S. , Spedalieri Gaetana , Braunstein Samuel L. , Gehring Tobias , Andersen Ulrik L.
Published: May 2021

We consider a quantum relay that is used by two parties to perform several continuous-variable protocols of quantum communication, from entanglement distribution (swapping and distillation) to quantum teleportation, and quantum key distribution. The theory of these protocols is suitably extended to a non-Markovian model of decoherence characterized by correlated Gaussian noise in the bosonic environment. In the worst-case scenario where bipartite entanglement is completely lost at the relay, we show that the various protocols can be reactivated by the assistance of classical (separable) correlations in the environment. In fact, above a critical amount, these correlations are able to guarantee the distribution of a weaker form of entanglement (quadripartite), which can be localized by the relay into a stronger form (bipartite) that is exploitable by the parties. Our findings are confirmed by a proof-of-principle experiment where we show, for the first time, that memory effects in the environment can drastically enhance the performance of a quantum relay, well beyond the single-repeater bound for quantum and private communications.
Gate-tuned anomalous Hall effect driven by Rashba splitting in intermixed LaAlO3/GdTiO3/SrTiO3
Authors: Lebedev N. , Stehno M. , Rana A. , Reith P. , Gauquelin N. , Verbeeck J. , Hilgenkamp H. , Brinkman A. , Aarts J.
Published: May 2021

The Anomalous Hall Effect (AHE) is an important quantity in determining the properties and understanding the behaviour of the two-dimensional electron system forming at the interface of SrTiO3-based oxide heterostructures. The occurrence of AHE is often interpreted as a signature of ferromagnetism, but it is becoming more and more clear that also paramagnets may contribute to AHE. We studied the influence of magnetic ions by measuring intermixed LaAlO3/GdTiO3/SrTiO3 at temperatures below 10 K. We find that, as function of gate voltage, the system undergoes a Lifshitz transition while at the same time an onset of AHE is observed. However, we do not observe clear signs of ferromagnetism. We argue the AHE to be due to the change in Rashba spin-orbit coupling at the Lifshitz transition and conclude that also paramagnetic moments which are easily polarizable at low temperatures and high magnetic fields lead to the presence of AHE, which needs to be taken into account when extracting carrier densities and mobilities.
Unconventional effects of long-term storage of microwave-modified chicken egg white lysozyme preparations
Authors: Leśnierowski Grzegorz , Yang Tianyu , Cegielska-Radziejewska Renata
Published: May 2021

Thermal modification is an effective method that induces significant expansion of the antimicrobial properties and other valuable properties of chicken egg white lysozyme. In our latest research, a new innovative method of enzyme modification was developed, in which microwave radiation was used as an energy source to process liquid lysozyme concentrate (LLC). After modification, high-quality preparations were obtained. However, long-term storage in a concentrated form initiated various processes that caused darkening over time and could also lead to other significant changes to their structure and, consequently, to their functional properties. This necessitated multidirectional research to explain this phenomenon. This paper presents the results of research aimed at assessing the physicochemical changes in the properties of microwave-modified lysozyme in the form of a liquid concentrate after long-term storage under refrigeration conditions. The assessment also considered the conditions under the acidity of the modifying medium and the duration of the microwave modification. The analysis showed that the values of the basic parameters determining the quality and usefulness of the modified enzyme significantly improved during long-term storage of the preparations. The greatest changes were observed in the preparations modified for the longest time and in the most acidic environment (process time 260 s, pH 2.0), the number of oligomers under these conditions increased by 18% after 12 months of holding, and the surface hydrophobicity increased by as much as 31%. In addition, microbiological tests showed that the preparations of microwave-modified lysozyme had an effect on gram-positive bacteria as well as on gram-negative, and this effect was significantly enhanced after 12 months. The results confirm that LLC modification with microwave radiation is a highly efficient method to prepare high-quality and high utility potential lysozyme. Notably, an interesting and important phenomenon was the observation of the unconventional behaviour of the preparations during their long-term storage, which increased their utility potential significantly.
Flow cytometry detection of sustained humoral immune response (IgG + IgA) against native spike glycoprotein in asymptomatic/mild SARS-CoV-2 infection
Authors: Piñero Paula , Marco De La Calle Francisco M , Horndler Lydia , Alarcón Balbino , Uribe Barrientos Marisol , Sarmiento Héctor , Tarín Fabián
Published: May 2021

SARS-CoV-2 is the virus that causes the disease called COVID-19, which has caused the worst pandemic of the century. Both, to know the immunological status of general population and to evaluate the efficacy of the vaccination process that is taking place around the world, serological tests represent a key tool. Classic serological tests, based on colorimetric techniques, such as ELISA or CLIA, continue to be the most widely used option. However, a real improvement in results is still needed. We developed a highly sensitive and specific FCM assay that allows the detection of IgG and IgA antibodies, directed against the native and functional S-protein of SARS-CoV-2 exposed on the membrane of a transfected cell line, up to 8 months after infection.
Realising and compressing quantum circuits with quantum reservoir computing
Authors: Ghosh Sanjib , Krisnanda Tanjung , Paterek Tomasz , Liew Timothy C. H.
Published: May 2021

Quantum computers require precise control over parameters and careful engineering of the underlying physical system. In contrast, neural networks have evolved to tolerate imprecision and inhomogeneity. Here, using a reservoir computing architecture we show how a random network of quantum nodes can be used as a robust hardware for quantum computing. Our network architecture induces quantum operations by optimising only a single layer of quantum nodes, a key advantage over the traditional neural networks where many layers of neurons have to be optimised. We demonstrate how a single network can induce different quantum gates, including a universal gate set. Moreover, in the few-qubit regime, we show that sequences of multiple quantum gates in quantum circuits can be compressed with a single operation, potentially reducing the operation time and complexity. As the key resource is a random network of nodes, with no specific topology or structure, this architecture is a hardware friendly alternative paradigm for quantum computation.
Protein corona profile of graphene oxide allows detection of glioblastoma multiforme using a simple one-dimensional gel electrophoresis technique: a proof-of-concept study
Authors: Di Santo Riccardo , Quagliarini Erica , Digiacomo Luca , Pozzi Daniela , Di Carlo Angelina , Caputo Damiano , Cerrato Andrea , Montone Carmela Maria , Mahmoudi Morteza , Caracciolo Giulio
Published: May 2021

Protein Corona-based blood test for the detection of glioblastoma multiforme.
Oxygen vacancy-dependent photocatalytic activity of well-defined Bi2Sn2O7−x hollow nanocubes for NOx removal
Authors: Lu Yanfeng , Chen Meijuan , Huang Tingting , Huang Yu , Cao Jun-ji , Li Haiwei , Ho Wingkei , Lee Shun Cheng
Published: May 2021

Bi2Sn2O7−x with Sn-/Bi-adjacent oxygen vacancy were designed and applied for photocatalytic removal of rarefied NO. DFT and experiments provided a straightforward and clear understanding of the structure-performance relationship of oxygen vacancies.
Reply to the Comment on “FeS colloids – formation and mobilization pathways in natural waters” by S. Peiffer, D0EN00967A
Authors: Noël Vincent , Kumar Naresh , Boye Kristin , Lezama-Pacheco Juan S. , Brown Gordon E. , Bargar John R.
Published: May 2021

In this response to the comment by S. Peiffer, Environ. Sci.: Nano, 2021, we show that detailed examination of the Fe speciation provides clear evidence of the Fe–S-colloid stability and composition.
Optical study of electron and acoustic phonon confinement in ultrathin-body germanium-on-insulator nanolayers
Authors: Poborchii Vladimir , Groenen Jesse , Geshev Pavel I. , Hattori Junichi , Chang Wen Hsin , Ishii Hiroyuki , Irisawa Toshifumi , Maeda Tatsuro
Published: May 2021

Ge-on-insulator (GeOI) acoustic phonon frequencies andE1electron band gapvs.GeOI thickness (T) show agreement with confinement theories atT> 5 nm and disagree atT< 5 nm. Al2O3coating improves agreement atT< 5 nm due to interface disorder reduction.
Self-assembly behavior of oligo(ethylene glycol) substituted polycaprolactone homopolymers
Authors: Calubaquib Erika L. , Soltantabar Pooneh , Wang Hanghang , Shin Heejin , Flores Alfonso , Biewer Michael C. , Stefan Mihaela C.
Published: May 2021

In this work, non-ionic amphiphilic oligo(ethylene glycol)-substituted polycaprolactone homopolymers readily self-assembled to form micelles in a polar environment, which allowed the encapsulation of a hydrophobic molecule.
Measures of Psychological Impacts of Stuttering in Young School-Age Children: A Systematic Review
Authors: Jones Monique L. , Menzies Ross G. , Onslow Mark , Lowe Robyn , O'Brian Sue , Packman Ann
Published: May 2021

Purpose

Recent research has shown that some school-age children who stutter may have speech-related anxiety. Given this, speech-language pathologists require robust measures to assess the psychological effects of stuttering during the school-age years. Accordingly, this systematic review aimed to explore available measures for assessing the psychological impacts of stuttering in young school-age children and to examine their measurement properties.

Method

The systematic search protocol was registered with PROSPERO (ID: 163181). Seven online databases, in addition to manual searching and screening of reference lists, were used to identify appropriate measures for the population of children who stutter aged 7–12 years. The first two authors independently assessed the measures using the quality appraisal tool described by Terwee et al. (2007).

Results

Despite the comprehensive search strategy, only six measures were identified for quality appraisal. No assessment tool was found to possess adequate measurement properties for the eight assessed domains: content validity, internal consistency, construct validity, reproducibility, reliability, responsiveness, floor and ceiling effects, and interpretability. No measure had clear evidence of responsiveness to clinical change. Based on the criterion defined by the Terwee et al. (2007) appraisal tool, the Communication Attitude Test and the Overall Assessment of the Speaker's Experience of Stuttering for School-Age Children received the highest number of ratings in support of their measurement properties.

Conclusions

The results highlight a lack of available measures in this domain and poor practices in developing and testing measurement instruments. To ensure that clinicians and researchers are equipped with sound measures to meet the mental health needs of this vulnerable population, further research to establish resources is needed.
The sensorless control strategy of UAV rotor motor in full speed range
Authors: Ma Siyuan , Yu Xiang , Guo Yunjun , Ran Rong
Published: May 2021

UAV (Unmanned Aerial Vehicle) has broad application prospects in various fields. In order to meet the needs of stability and efficiency during flight, a surface-mounted permanent magnet synchronous motor is used as its rotor motor, and a position sensorless control technology is used to control the rotor motor with high efficiency and high dynamic response. This paper proposes a position sensorless control strategy in the full speed range for the actual application requirements of UAV. In low speed ange, I/F control strategy with speed-open-loop and current-closed-loop is. In medium and high speed range, a sliding mode observer is adopted to provide estimated rotor position and speed. To achieve smooth switching from I/F control stage to speed closed-loop stage, a switching algorithm is proposed. The feasibility of the proposed hybrid control strategy is verified by simulation results.
Wind Turbine System based Virtual Synchronous Generator Control for Microgrid Frequency Regulation
Authors: Rehman Haseeb Ur , Yan Xiangwu , Jan Mishkat Ullah , Abdelbaky Mohamed Abdelkarim , Iqbal Sheeraz , Egamnazarova Tamara , Ali Rizvi Syed Asad Abbas
Published: May 2021

The power system is dominated by the renewable energy resources since last two decades. The main cause behind this enormous deployment of RES is to combat the global warming and to decrease dependency on fossil fuels. Wind energy is one of the abundant available sources of energy throughout the world. However, the huge deployment of wind energy in the power system cause vulnerability to the system. The main cause is the lack of system inertia in RES which cannot effectively respond during the power imbalance condition. To counter this effect, the virtual synchronous generators are deployed in the RES based power system. The VSG mimics the synchronous generator features and therefore it possesses the ability to provide the inertial support to system. In this paper, a wind base multiple VSG system is proposed to counter the frequency irregularities of the system. Furthermore, a comparison with classical droop control is done based on load variation. Moreover, the genetic algorithm is used to optimize the values of damping and inertia of the VSG. The performance of the proposed system is validated in MATLAB/Simulink 2019.
Optimization design of heat pipe heat exchanger using response surface methodology
Authors: Pu Shuai , Huang Wei
Published: May 2021

In this paper, Optimization design of heat pipe heat exchanger (HPHX) is processed utilizing the Response Surface Methodology (RSM). The response surface model was built by regressive analysis using Latin hypercube experimental design method and numerical simulation. Through response surface analysis, it is found that the two input variables affecting the performance of HPHX are the heat pipe pitch and the Inlet and outlet distance. Moreover, the maximum value of the overall performance factor on the response surface is searched using genetic algorithm, and the optimal values of four input variables are obtained.
Predicted influence of overhead transmission lines on land-use transfer: A case study on landscape and famous scenery
Authors: Chen Xi , Gao Ying , Peng Fengjiao , Hang Cuicui , Cai Yong , Wang Bo
Published: May 2021

Taking Baihetan—Jiangsu ±800kV UHVDC power transmission project as an example, the influence of tower foundation on land-use types and functions were predicted using ArcGIS platform and eCognition Developer. Through the construction of land-use transfer matrix analysis, the change of land-use transfer situation and structure were discussed. Our results showed that the forest transfer intensities (RT) of Tangya River Scenic spot and Three Gorges Scenic area were 0.64 and 1.49 respectively, the RT of bushes and grasses in Tangya River Scenic spot and Three Gorges Scenic area were 1.01 and 0.37. The RT of forest, bushes and grasses were both not high. The permanent occupation area of project was all transferred into building land, the construction land dynamics degrees (KT) of Tangya River Scenic spot and Three Gorges Scenic area were +0.40% and +0.031% respectively, which were both low. Thus we drew a conclusion that the project construction would have a slight impact on land use pattern and function and would not affect the overall ecological function and structure of landscape and famous scenery.
Design of New energy ship power safety monitoring system based on Internet of things
Authors: Wang Yixue , Wang Zhuoer , Peng Qiang
Published: May 2021

With the current technology of ship power battery and alternative fuel power system gradually mature, many countries have issued relevant policies to emphasize the promotion of ship new energy, while the current domestic ship related active safety system is still in the state of low automation, low intelligence and low integration. In this regard, the project introduces artificial intelligence algorithm to design a set of new energy ship power module monitoring system for fuel cell ships and pure electric ships, which can be used for marine power battery output management and safety monitoring, mainly including hydrogen fuel cell safety monitoring system, power battery (buffer cell) safety monitoring system and power integrated safety monitoring system. This work combines embedded technology with Internet of things technology and artificial intelligence algorithm to solve the safety management problem of new energy ship power system. If it is applied to the actual ship, obvious social and economic benefits can be achieved.
Influence of Hydro Turbine Supervision and Control System on Frequency Characteristics of High Proportion Hydropower System
Authors: Wang Guanhong , Geng Zhichen , Ai Dongping , Wei Wei , Li Ying , Li Gan , Jin Liming , Li Wenfeng , Tang Yong
Published: May 2021

With the construction of interconnected power grid and the rapid development of clean energy, the frequency problem of power system is becoming increasingly prominent. The problem of ultra-low frequency oscillation affects the stability of system frequency. In order to analyze the frequency regulation characteristics of the system, it is necessary to study the local active power control link and stability calculation model of the hydropower plant computer monitoring system. In this paper, the influence of the local active power control link of the monitoring system on the system frequency small signal stability is studied, and the model is built in the simulation program. Through the simulation of 4-machine-2 regional power grid, the influence characteristics of local active power control on frequency dynamic damping level are verified. In the example of large power grid, the coordination between the local active power control of the monitoring system and the speed regulation system of hydropower units is comprehensively considered, the suggestion of coordination of multi-level frequency modulation resources to system frequency regulation is put forward.
Research on technology of 1550nm all-fiber continuous wave coherent Doppler wind lidar
Authors: Tang Zheng , Feng Wei , Wang Mengfan , Yu Benli , Tu Guojie
Published: May 2021

In order to obtain the telemetry data of wind field 80 m ahead of the wind turbine, an all-fiber continuous wave coherent Doppler lidar (CW-CDL) system is demonstrated in this paper. The CW-CDL of all-fiber structure has advantages of the compact structure, good stability and low cost. However, there is inherent crosstalk in the optical circulator of the optical fiber module, the crosstalk light and the reference light enter the photon detector together to produce phase induced intensity noise (PIIN). Aiming to effectively solve the noise, we proposed a polarization control method by combining a polarization beam splitter and a quarter wave plate to reduce the PIIN in the system. The wind speed Doppler signal at 80 meters is obtained on a sunny day, and the typical signal-to-noise ratio can reach 21.7 dB.
Flow field optimizing study of low temperature economizer in a coal-fired boiler
Authors: Deng Xiaochuan , Sun Fengchang , Bai Zhonghua , Yu Zongze , Wu Jiahua , Yu Dongyang , Wang zheng
Published: May 2021

The complex structure of double inlet gas flue has a significant influence on gas flow field distribution in a 1000MW coal-fired boiler’s low temperature economizer. In order to optimize gas flow field of the low temperature economizer with double inlet gas flues and reduce its failure rate, this paper presents a flow field simulation of the low temperature economizer based on the computational fluid dynamics (CFD). This numerical simulation was operated by using porous media model instead of the complex structure inside heat exchanger and the standard k-epsilon model. Velocity contours of a same vertical cross-section inside of inlet gas flue of the heat exchange zone in different numerical simulations were evaluated by the evaluation standard of RSM. The results of numerical simulation show that the main reasons for uneven distribution of flow field in economizer and its inlet gas flues are unequal diameter of flue elbow and straight flue, unreasonable setting of guide plate and diffusion flue elbow. After making structural optimization of the low temperature economizer such as equalizing elbow to the straight flue diameter and setting the guide plate reasonably, the flow field in the low temperature economizer and its flues are obviously improved.
Research on technology of data link fusion about UAV used on inspection for Power transmission line
Authors: Mei Cui Zhi , Du Huang Zhi
Published: May 2021

UAV is so small and flexible that plays an important role in inspection for Power transmission line, especially at the voltage of 110kV, 220kV, 500kV and so on. Coupled with the development of UAV autonomous intelligent inspection technology, the personnel who should inspect the Power transmission line need not to across mountains or climb up to the power transmission towers to inspect the insulators and other equipment manually, so it has been widely used in the inspection for Power transmission line. The stable controlling of UAV flight is and the data link fusion is the basic guarantee of multiple UAV cluster operation. this paper bases on the mode of cluster operation and analyzing the technology of data link fusion, then puts forward single to multiple mode of Data fusion in RTK, which provides an important reference for the research of multiple UAV cluster operation about inspection.
Development of dye sensitized solar cells
Authors: Chen Mengdan
Published: May 2021

With the development of society, the demand for energy is increasing significantly, and the environmental problems are becoming more and more serious. Therefore, it is urgent to find efficient and clean new energy. Among the many new energy sources, solar energy has been favoured most for its universality, harmlessness and low cost. In 1991, the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs) has been greatly improved, which has attracted the attention. In recent 30 years, the researches on DSSCs have been increasing and expanding. Dye sensitizer is the most important component of DSSC, and also a key issue of researchers. This paper aims to summarize the types, structures and development trends of dye sensitizers, and provide inspiration for us to design and evaluate new dye sensitizers.
The Inertial Energy Control Strategy of the Cascade H-Bridge Module applied in Photovoltaic System
Authors: Zhao Chenghan , Li Xiang , Xie Da , Pan Mingjie
Published: May 2021

This paper put forward the inertial control strategy based on the control of charge and discharge of supercapacitor and the trigger angle of H-bridge which integrates photovoltaic (PV) system. The whole cascade H-bridge structure is composed of traditional photovoltaic module, Boost/Buck circuit, supercapacitor (SC), and H-bridge circuit. First, the charging state and the inertial energy power support of the SC are analysed. Then the control strategy of the cascade H-bridge is proposed. To verify the efficiency of the control strategy, a cascade chain consists of 12 H-bridge unit was built in EMTP simulation software. Finally the simulation results prove that the newly developed SC-integrated cascade module can do inertial energy support well, which is important to the coordination between the power system and solar energy.
Current Status and Prospects of Reliability Test Research on Special Computers
Authors: Li Chao
Published: May 2021

Special computers are widely used in aerospace, ships, weapons and other fields. More and more attention is paid to the reliability of special computers. Although my country started late in this regard, it has achieved some results after continuous exploration by a large number of scientific research institutions, and has gradually kept up with the pace of research in developed countries. This article first summarizes the research status and importance of accelerated life test in reliability test research, and analyzes the key technology and development of reliability test of special computer. Reliability analysis can solve the failure problems that cannot be explained by traditional quality analysis methods, and will surely make remarkable achievements in the future industrial development. The summary of this article will provide theoretical reference for subsequent related research.
Analysis of Annular Pressure Generation Mechanism and Research on Safety Evaluation
Authors: Zhang Yingying , Rong Wei , Xie Weiyi , Liu Qilun , Chen Xixi , Liu Liangwen , Zhang Xu
Published: May 2021

With the rapid increase of seasonal heating gas consumption in winter in the Beijing-Tianjin-Hebei region, the existing gas storage scale and injection and production well network in the central Hebei region can hardly meet the demand of storage capacity utilization and gas recovery. Therefore, the effective utilization of old Wells has become the goal of gas storage construction. However, the old Wells that have been put back into production are mostly converted from depleted reservoirs, which have different degrees of annular pressure problems. Through investigation and investigation, it is found that there are many factors causing annular zoning pressure. By analyzing the properties of Wells with high sulfur content and high temperature and pressure, this paper studies the mechanism of causing annular zoning pressure, and puts forward the safety management method, so as to make the safety evaluation of annular zoning pressure more comprehensive.
Research on maintenance tools of wire clamps for live working on Ultra High Voltage transmission lines
Authors: Wang Zhigang , Mei Wenjian , Yang Qi , Qiao Mingming , Chen Jianping , Li Peng
Published: May 2021

Aiming at the problem that the suspension clamp is difficult to be quickly replaced due to the heavy load of the suspension clamp when replacing the transmission line wire suspension clamp in the UHV live operation, this paper develops an auxiliary device for realizing the rapid replacement of the conductor suspension clamp. Through the design of fixtures suitable for the installation of UHV wires and connecting plates, the load transfer of the suspension clamp can be quickly realized, and the suspension clamp can be separated and replaced under the condition of no force. The device is flexible and light, and effectively improves the live working personnel work efficiency.
Unmanned Wing-in-Ground-Effect Ship Design with Optimized Propulsion Mode
Authors: Zeng Han , Zhang Yan
Published: May 2021

In order to solve the existing deficiencies of the unmanned WIG ship, a new type of unmanned WIG ship with the optimized propulsion unit was designed, where the lift-type water-air amphibious double-ducted-fan propulsion unit increased the drainage and navigation speed of the unmanned WIG ship by a large margin, and the load at the junction between the propulsion unit and ship body was reduced to a great extent. Through simulation and theoretical analysis, it is verified that the unmanned WIG ship with the optimized propulsion mode can further accelerate the drainage and navigation speed of the unmanned WIG ship and reduce the load at the junction between the propulsion unit and ship body during the navigation in water, so its operating performance and safety are both strengthened. Therefore, this newly developed unmanned WIG ship can deliver good social and economic benefits.
Pulse laser surface modification of poly-ether-ether-ketone for surface metallization
Authors: Wang Nan , Li Jia-Feng , Bai Jing-Ying , Wang Xu-Guang , Zhang Li-Gong
Published: May 2021

In order to broaden the application range, PEEK has been modified by 1064nm-wavelength pulse laser, then deposited with Ni-P alloys by electroless plating. The properties of metal layers on PEEK were characterized by SEM, resistance tester and metallographic microscope, respectively. When the laser energy density is relatively low (Q<60J·cm-2), there is mainly photothermal effect on the PEEK with laser, and the surface of the substrate presents periodic undulating groove structure with a small number of holes. When the laser energy density is rather higher (Q≥60J·cm-2), there are simultaneously enhanced photothermal effect and partial photochemical effect. As a result, the surface of PEEK is uniformly covered with melted layer or re-solidified product after melting. Besides, the nickel coatings on the PEEK have been dense, uniform and in good adhesion with the substrate for the sample after laser treatments (Q>10J·cm-2), of which the surface resistance of the coating is less than 20 mΩ. In this paper, the interaction mechanism of the pulse laser on PEEK has been studied and the metals on the PEEK have been prepared under the laser-induced effect, which provides technical support for the future application of PEEK in aviation with aerospace fields, such as, radar and antenna.
The effectiveness of waste oyster shells (WOS) as major fine aggregate replacement in concrete
Authors: Cai Xinglu , Liu Ruiwen , Fan Junhao , Liao Yingdi
Published: May 2021

Over-exploitation of natural river sand and waste oyster shells (WOS) dumped randomly will cause serious environmental issues. Thus, a drive to using crushed WOS as fine aggregates to substitute river sand in concrete production has been initiated. This paper conducted experimental research to study the possibility of employing the crushed WOS as 100% fine aggregates in concrete. The workability, compressive strength and its size-effect, and sustainability performance of the concrete mixtures were investigated. The results indicated that, under the same water-cement ratio, the WOS concrete showed a great improvement in strength properties while a decline was found in slump tests, compared to the control concrete. Besides, the use of the crushed WOS in concrete production resulted in a modification in both eco-efficiency and cost-efficiency.
Performance analysis of solid oxide fuel cell and micro gas turbine top-level cycle
Authors: Peng Qiao Run , Chao Liang Qian , Neng He Jun , Fan Yang
Published: May 2021

First, a simulation model of the SOFC-MGT top-level combined cycle was established through Matlab/Simulink, and then the effect of different methane flow rates on the performance of the stack and the SOFC-MGT system was analyzed. The research results show that with the increase of methane flow, the power of the stack and SOFC-MGT system gradually increases, but the efficiency of the SOFC-MGT system gradually decreases with the increase of methane flow.
Distributionally Robust Stochastic Optimal Power Flow Considering N-1 Security Constraints with renewable
Authors: Ni Shiyuan , Wu Guilian , Wang Zehao , Lin Yi , Yao Defei , Zhang Ruosi
Published: May 2021

This paper proposes a data-driven stochastic optimal power flow model considering the uncertainties of renewable energy sources. The proposed model also focuses on the constraints of reactive voltage, aiming at improving the safety of voltage amplitude and reactive power output at each bus. Using data-driven linearization techniques, we simplified the calculation of system. In addition, Wasserstein ambiguity set was used to describe the uncertainties of renewable energy prediction error distribution, and a robust stochastic optimal power flow model considering N-1 security constraints is established. The simulation results on IEEE-39 system showed the accuracy and effectiveness of the distributionally robust optimization model and the reactive voltage constraint model provided a more stable operation schedule.
Research on compressive strength of hybrid fiber reinforced concrete based on orthogonal design
Authors: He Tu-Sheng , Xie Meng-Qian , Liu Yang , Zhao San-Yin , Li Zai-Bo
Published: May 2021

The influence of steel fiber and polypropylene fiber mixed on compressive strength of high performance concrete (HPC) was studied. The steel fiber content (0.5%, 1.0%, 1.5%, 2.0%) (volume fraction, the same below), polypropylene fiber content (0.05%, 0.1%, 0.15%, 0.2%) and length (5mm, 6.5mm, 12mm, 18mm) were studied by L16 (45) orthogonal test for 28d ages, the range analysis and variance analysis of the test results are carried out, and the prediction model of compressive strength of hybrid fiber reinforced concrete was established. The results show that: The significant influence factor of concrete compressive strength is the volume fraction of polypropylene fiber, while the length of polypropylene fiber and the volume fraction of steel fiber are not significant; the concrete compressive strength with polypropylene fiber shows negative hybrid effect; The prediction model of compressive strength of hybrid fiber reinforced concrete has high accuracy, and the average relative errors is 2.96%.
Progress in Photocatalytic Degradation of Organic Wastewater by Graphene Binary Composites
Authors: Wang Xue-Qin , He Qin
Published: May 2021

Graphene composites not only have most advantages of graphene, but also have the characteristics of easy regulation, morphology and so on. Among many applications, graphene composite photocatalytic degradation of organic wastewater is one of the most likely graphene technologies. At present, the most studied graphene complexes include graphene monophyletic complex, graphene binary complex and graphene ternary complex. In this paper, the preparation of graphene binary complex and the research status of photocatalytic degradation of organic wastewater are summarized, and the existing problems are analyzed in order to provide a reference for the further research and application of graphene complex photocatalytic degradation of organic wastewater.
Screening of Metal Modified HKUST-1 to Enhance Mercury Removal Efficiency
Authors: Zhang Mingjie , Li Hongzhe , Yang Gang , Yu Jiahui , Chen Yipei
Published: May 2021

In this work, HKUST-1 and different metal modified HKUST-1 materials were investigated in Hg0 removal performance under air condition. Results showed that the pristine HKUST-1 only has a mercury removal rate of around 20%. After metal modification of HKUST-1, the removal efficiency was significantly improved. Among different modification materials employed in this study, HKUST-1 modified by manganese chloride exhibited the highest Hg0 removal efficiency of 95% at 250 oC. This value is relatively high compared with most previously reported catalysts. In addition, this study reveals that the enhanced Hg0 removal efficiency results from the increase of Brønsted acid sites on the sample surface, which is vital to Hg0 removal. Furthermore, it is found that SO2 produced little toxicity to Mn(Cl)/HKUST-1 in the presence of O2. This is beneficial to remove Hg0 in the industrial flue gas, where SO2 is a common component. Therefore, Mn(Cl)/HKUST-1 synthesized here is a promising catalyst for Hg0 removal.
Influence of magnetic field and working voltage on the tripping performance in spherical cylindrical ECP
Authors: Zhang Jianping , Ren Baodong
Published: May 2021

In order to further improve the trapping effect of fine particles, a new electrostatic cyclone precipitator (ECP) with magnetic confinement was proposed, the overall efficiencies of fine particles under different operating conditions were numerically simulated, and the influence of working voltage on the dust-removal effect of fine particles with and without magnetic field were discussed. The results show that increasing working voltage or magnetic induction intensity improves the trapping performance of spherical cylindrical magnetically confinement ECP, and the lifting effect gradually weakens while increasing the same amplitude. The results can offer technical reference for the optimization design of greatly improving the ECP dust-removal performance.
Experimental Study on Electrochemical Softening for Cooling Circulating Water in Converter Station
Authors: Zhu Xia , Liu Xiaoyu , Tian Ying , Li Zhengkun , Ren Zhenhua , Wang Juan , Liu Sufei , Wang Can , Du Shuai
Published: May 2021

In this study, the electrochemical softening method was used to treat the simulated drainage of the converter station, and the treatment effect under different water inlet conditions was investigated. The results show that the hardness removal rate is from 10% to 80% when the residence time is from 0.5h to 4h, and the longer the residence time is, the higher the removal rate is. The maximum scale removal capacity reached 2.67g/h/m2 when residence time was 1h. Through the formula fitting of several groups of tests, it is concluded that the removal effect can be expressed by the formula C0/C=0.9627e(17.73at/V) under different water intake (residence time).
Finite element analysis of flexural behavior of textile reinforced concrete slab
Authors: Xu Mingqiu , Shao Jianhua , Tang Baijian , Li Hongming
Published: May 2021

Order to investigate the failure effect of textile reinforced concrete (TRC) plate under bending load, the corresponding finite element model is established. By comparing the numerical simulation results with the experimental results, the rationality and feasibility of the finite element model are verified, and then the crack extension of TRC and the ultimate strain of carbon textile are analyzed. The failure mode of the slab under bending load is obtained, and it is found that the carbon textile concrete slab has better reinforcement effect, which greatly improves the safety performance of concrete members.
Laboratory experimental study on red mud geopolymer used as road subgrade materials
Authors: Qin Lusheng , Nie Qingke , Zhang Haiqing , Jia Xiangxin , Zhang Chuanchuan
Published: May 2021

Red mud is a strong alkaline waste discharged from the process of alumina extraction, which is harmful to the environment and its utilization rate is always low. One of the effective ways to utilize red mud is used as road subgrade material. In this paper, the industrial wastes including red mud, fly ash, slag, and desulfurized gypsum are used as basic raw materials to prepare subgrade filling materials. A series of laboratory tests, such as compaction test, California Bearing Ratio (CBR) test (soaked and non-soaked conditions) and permeability test, are carried out. The physical and mechanical properties, such as maximum dry density, optimum moisture content, CBR value, expansion, permeability coefficient and soaked strength loss rate, of the mixtures with different proportions, were studied. The results can provide reference for the selection of the best proportion scheme and promote the utilization of red mud in subgrade engineering.
Finite Element Analysis of Bearing Capacity of Reinforced Concrete Pipe Strengthened by TRC
Authors: Zhao Xinming , Kan Cheng , Ye Yuxiao , Hu Shaowei , Zhou Baibing
Published: May 2021

A non-linear 3D finite element model was established to simulate the three edge-bearing test of TRC reinforced concrete pipe. The pipe load-displacement curve, cracking load, and ultimate load simulation values are in good agreement with the test values. Subsequently, a parametric study was conducted. The effects of reinforcement layer bonding mode, mesh size of concrete element, mesh distribution rate and concrete compressive strength on the performance of reinforced concrete pipeline strengthened by TRC were considered. It provides a basis for the design of TRC reinforced concrete pipes.
Efficient adhesion of bubble on superhydrophobic tapered groove surface
Authors: Tang Jianfeng , Liu Cong , Feng Shile , Liu Yahua
Published: May 2021

Efficient adhesion of gas bubbles in aqueous environments has great application potentials in various gas-related processes, especially in wastewater treatment. In previous research, much attention has been paid to the design of underwater bubbles transport platforms, however, the bubble adhesion abilities of them are explored insufficiently. Herein, we investigated the bubble adhesion abilities of the superhydrophobic V-shaped pattern (SVP) and a designed superhydrophobic tapered groove (STG). It is revealed that the STG exhibits efficient bubble adhesion abilities compared with the SVP, including bubble retention time (t), adhesion volume and holding efficiency (η). In addition, the STG can retain stable adhesion abilities after several adhesion cycles. We believe that these results provide an alternative approach for subaqueous bubble practical applications.
Stability Analysis of High-Pile and high-pier Considering Initial Pier Deviation
Authors: Zhu Mei-Liang , Zhang Li-Qing , Ma Ye , Jiang Shun-Kun
Published: May 2021

Based on the high-pile and high-pier bridge of Qianhuang Expressway, eigenvalue buckling analysis is carried out by establishing three-dimensional finite element models of three different bridge types and high-pier types, and the corresponding structural nonlinear buckling loads under different initial pier deviations are calculated. The calculation results show that the nonlinear buckling loads of three high-pier types are less than elastic buckling loads. The stability of column high-pile and high-pier of continuous bridge is better than that of simple supported bridge, and the stability of plate high-pier is better than that of other two high-piers. In addition, the corresponding buckling load decreases with the increase of the initial horizontal displacement, indicating that the pier top offset of the high-pile and high-pier bridge is not conducive to the stability of the structure.