bluuebunny/crossref_metadata_2025 huggingface dataset:
Constant-potential molecular dynamics simulation and its application in rechargeable batteries
Authors: Yu Legeng , Chen Xiang , Yao Nan , Gao Yu-Chen , Zhang Qiang
Published: May 2023

Molecular dynamics reveals structures, properties, and reactions at battery interfaces on the atomic scale. Imposing a constant electrode potential in the simulation brings the model one step closer to physical reality and battery working conditions.
Crystal growth of two-dimensional organic–inorganic hybrid perovskites and their application in photovoltaics
Authors: Zhang Yuling , Wang Ruyue , Tan Zhan'ao
Published: May 2023

Crystal growth of two-dimensional organic–inorganic hybrid perovskite has attracted much attention toward adjusting the orientation to obtain higher PCE and more lasting operational stability.
Flexible and temperature-responsive hydrogel dressing for real-time and remote wound healing monitoring
Authors: Jiang Ji , Ding Jie , Wu Xiaoyang , Zeng Mingze , Tian Yuan , Wu Kai , Wei Dan , Sun Jing , Guo Zhenzhen , Fan Hongsong
Published: May 2023

A flexible hydrogel based on PAA-g-PNIPAM/PAM-AgNWs was established as a conductive and temperature-responsive matrix. By integrating a wireless Bluetooth module, real-time and remote monitoring of wound temperature is realized for smart wound management.
Research progress of MIL-125 and its modifications in photocatalytic hydrogen evolution
Authors: He Yijun , Lv Tianping , Xiao Bin , Liu Bo , Zhou Tong , Zhang Jin , Zhang Yumin , Zhang Genlin , Liu Qingju
Published: May 2023

In this review, the structure and properties, modification methods, and research progress in the field of photocatalytic hydrogen evolution of MIL-125 are systematically summarized, and the future development of MIL-125 is predicted.
500 V breakdown voltage in β‐Ga2O3 laterally diffused metal‐oxide‐semiconductor field‐effect transistor with 108 MW/cm2 power figure of merit
Authors: Abedi Rik Nesa , Orouji Ali. A. , Madadi Dariush
Published: May 2023

The authors’ present a silicon‐on‐insulator (SOI) laterally diffused metal‐oxide‐semiconductor field‐effect transistor (LDMOSFET) with β‐Ga2O3 , which is a large bandgap semiconductor (β‐LDMOSFET), for increasing breakdown voltage (VBR) and power figure of merit. The fundamental purpose is to use a β‐Ga2O3 semiconductor instead of silicon material due to its large breakdown field. The characteristics of β‐LDMOSFET are analysed to those of standard LDMOSFET, such as VBR, ON‐resistance (RON), power figure of merit (PFOM), and radio frequency (RF) performances. The effects of RF, such as gate‐drain capacitance (CGD), gate‐source capacitance (CGS), transit frequency (fT), and maximum frequency of oscillation (fMAX) have been investigated. The β‐LDMOSFET structure outperforms performance in the VBR by increasing it to 500 versus 84.4 V in standard LDMOSFET design. The suggested β‐LDMOSFET has RON ~ 2.3 mΩ.cm−2 and increased the PFOM (VBR2/RON) to 108.6 MW/cm2. All the simulations are done with TCAD and simulation models are calibrated with the experimental data.
Research on Rural Comprehensive Energy Service Operation Based on Data-driven of Electric Power Internet of Things
Authors: Qian Yuxuan , Yang Jia , Liu Limin , Xu Yichuan , Qiao Mu
Published: May 2023

In order to promote the revolution of energy production and consumption, and build a clean, low-carbon, safe and efficient energy system, the research on rural comprehensive energy service operation based on the data drive of electric power Internet of Things was put forward. In this paper, the innovation of big data technology application concept drives the integrated energy service operation management mode, and improves the service quality and operation management efficiency. Focusing on the collaborative optimization of production and consumption, the construction and management of rural comprehensive energy services will make use of technological advantages to accurately locate customers’ needs, improve service efficiency, and benefit the concept of energy green ecological construction in rural comprehensive energy development planning to build a smart energy ecosystem.
Under the background of 100 million tons of crude oil purchase and sale contract: Countermeasures for smooth operation of the Alashankou-Dushanzi-Urumqi crude oil pipeline
Authors: Liu Dan , Deng Zhonghua , Wang Hao , Hu Xu , Chen Di , Li Linze
Published: May 2023

A 100 million ton crude oil purchases and sale contract signed between China and Russia, and the crude oil will pass through Kazakhstan and flow along the Alashankou-Dushanzi-Urumchi crude oil pipeline to western Region. As an important crude oil import channel, this paper analyzes the current situation of Alashankou-Dushanzi-Urumchi crude oil pipeline and puts forward some countermeasures. Both Russia and Kazakhstan are major crude oil exporters, with internal demand for exporting crude oil to China. There is a huge gap between domestic crude oil demand, and social and economic development depends on crude oil import. The geographical environment of the crude oil pipeline is conducive to pipeline protection. The security environment of Xinjiang has improved. The situation in Russia and Ukraine and the civil strife in Kazakhstan have limited impact on the pipeline which will have good development opportunities. Thus, this paper proposes the following management strategies. First of all, strengthen communication and coordination between upstream and downstream enterprises. Second, reduce cost and increase efficiency. Third, attach importance of the application of new technologies. Fourth, establish emergency plans and hold emergency drills for emergencies such as COVID-19 outbreak and pipeline leakage. Fifth, strengthen anti-terrorism and riot control. Sixth, strengthen corporate culture and talent team construction.
Study on Gas Drainage Technology in Goaf of Steep Seam
Authors: Shouguo Yang , Haoxin Liu , Xiaofei Zhang , Ning Xu
Published: May 2023

Aiming at the problem of gas control in the upper corner of steeply inclined coal seam, taking 3103 working face of a mine as an example, this paper determines the height range of fracture zone by combining theoretical empirical formula with on-site investigation of microseismic monitoring technology, designs the parameters of drainage borehole during production, and analyzes the gas drainage effect of long-strike borehole through on-site experiments. The results show that the average gas extraction concentration of the long borehole along the strike of 3103 working face is 53.55%, and the average gas extraction purity is 5.37 m3/min. After treatment, the gas concentration in the upper corner is about 0.4%, and the concentration in the return air roadway is about 0.3%, which ensures the control effect of gas extraction quantity.
Optimization of Lithium iron phosphate delithiation voltage for energy storage application
Authors: Xu Caili , Wu Mengqiang , Zhao Qing , Li Pengyu
Published: May 2023

Olivine-type lithium iron phosphate (LiFePO4) has become the most widely used cathode material for power batteries due to its good structural stability, stable voltage platform, low cost and high safety. The olivine-type iron phosphate material after delithiation has many lithium vacancies and strong cation binding ability, which is conducive to the large and rapid insertion of alkaline ions such as lithium, sodium and potassium. Therefore, the investigation of delithiation technology is of great significance. Electrochemical delithiation is a common method for preparing olivine-structured FePO4, which can maintain the structural stability and integrity of the material. In this work, the effect of voltage on the delithiation of LiFePO4 material was investigated by the electrochemical delithiation method in Na2SO4 as delithiation solution. The results show that 2.0 V is the best delithiation voltage, and the as-prepared FeO4 exhibits the highest specific capacity of 137.7 mAh g-1.
The Technological Innovation Capability of The New Energy Vehicle Industry
Authors: Yang Guixing
Published: May 2023

Several subsidy programs are being implemented by nations all over the world in an effort to support the growth of the new energy vehicle industry and increase its capacity for innovation. In order to assess the sector’s capacity for technical innovation, the innovation capability level of China’s new energy vehicle industry from 2012 to 2017 was computed using a network DEA model. Technology development and innovation transformation were the two stages into which the sector was split. The findings demonstrate that a mismatch between the effectiveness of the technology development stage and the effectiveness of the innovation transformation stage is the cause of innovative technology’s inability to support business operations. This mismatch also contributes to the new energy vehicle industry in China’s overall low level of innovation capability. Based on the study’s findings, significant policy suggestions are made in order to progress the new energy vehicle industry’s technological capabilities within the constraints of China’s present new energy policy.
Planning method for joint operation of integrated energy storage system considering reliability
Authors: Xu Yuanyuan
Published: May 2023

A joint operation planning method for integrated energy storage systems considering reliability is proposed. Firstly, the planning of the power exchange level of the energy storage system is achieved by calculating the optimal power exchange level of the supercapacitor, constructing a model for the optimal configuration of the two-layer energy storage, and using an algorithm for the solution of the model to optimise it. In the experiments, the joint operation planning performance of the proposed method is verified. The experimental results show that the model prediction accuracy is high when the proposed method is used for the joint planning of the integrated energy storage system, and has a more satisfactory joint operation planning performance.
Research on the Theory and Development of Carbon Emissions Trading Market under the Background of ‘Double Carbon’
Authors: Shen Futai , Wang Hua , Liu Zhiyuan , Yang Rong , Zhang Wenbo
Published: May 2023

In recent years, China’s carbon trading market has achieved good emission reduction results but it is not yet perfect. Carbon trading mechanisms are facing huge challenges. Through the analysis of the current industry carbon trading market, the problems existing affecting the process of the carbon emission trading market are deeply discussed, providing a methodology for the regional carbon trading mechanism and the implementation of the national macro carbon emission reduction targets. It puts forward three challenges to carbon trading market cognition, carbon trading subject and carbon emission reduction technology, to contribute to achieving carbon peak, carbon neutralization.
Contract decisions analysis of shared savings energy performance contracting based on Stackelberg game theory
Authors: Zhang Xun
Published: May 2023

Energy Performance Contracting is a contractual arrangement between energy users and Energy Service Companies (ESCOs) and is currently the main mechanism for implementing energy-saving retrofitting measures in existing buildings. The paper centers around the decision-making conundrum pertaining to the energy-saving sharing percentage and initial project investment within the realm of shared savings Energy Performance Contracting. By formulating a Stackelberg game-based decision-making game model, we examine the optimal contract decisions of both the energy user and the ESCO. The results of numerical experiments demonstrate that this method yields significant advantages for both energy users and ESCOs. Additionally, we observed that the employment of more sophisticated energy-saving technologies by the ESCO and a higher share of investment by the energy users result in superior energy-saving efficiency.
Flash butt welding on microstructures and mechanical properties of joints for high strength acid resistant steel
Authors: Wang Hongyan , Gao Xiuhua , Yu Chi , Li Wang , Li Tong , Du Linxiu
Published: May 2023

In this research, the 600 MPa acid resistant steel was used as flash butt welding base material, to study the effect of different upset allowance on the microstructure and mechanical properties of the joints. The results can be obtained as follows: with the increase of the upset allowance, it has a significant effect on the elongation, the ferrite content in the heat affected zone increases, and the joint strength first increases and then slowly decreases. When the upset allowance is bigger than 4mm, there are wide and large bainitic ferrites in the coarse grained zone, the joint strength deteriorates sharply. When the upset allowance is 3-4mm, the mechanical properties of the welded sample are the best, the tensile strength is 686-708MPa, the yield strength is 610-636MPa, the elongation is higher than 13.77%. The steel matrix can be strengthened effectively by forming grain refinement and dispersed granular bainite with proper upset allowance. The different hardness distributions of welded joints to display the difference of microstructure in different regions.
Extraction selection and process optimization of phenol-containing wastewater from coal chemical industry
Authors: Liu Hong , Zhang Xuehun , Zhang Siyuan , Liu Kang , Zhang Qingrui
Published: May 2023

In order to efficiently remove phenolics from coal chemical wastewater, this study utilizes molecular simulation to determine the most effective extractant. And the extraction effect is verified through simulation results. The energy of hydrogen bonding dominates the extractant’s extraction ability. The interaction between phenols the and solvent was examined using molecular simulation calculations, and it was discovered that the strong H-bond interaction between the CYC/1-PA synergistic extractant and phenols produces outstanding extraction effects. The results of the full process simulation validation showed that the CYC/1-PA synergistic extractant could properly treat the wastewater.
Simulation of co-production system based on coal partial gasification under different reactant gas atmospheres
Authors: Zhang Zeyi , Shao Yingjuan
Published: May 2023

In order to explore the comparison of coal partial gasification hydrogen-electricity cogeneration systems under different gasification agent atmospheres, based coal partial gasification, including steam cycle power generation and syngas processing for hydrogen production, a hydrogen-electric co-production system and its model of partial coal gasification and semi-coke combustion are constructed, respectively using (H2O/O2) and (CO2/O2) as gasification reactant gas. The effects of oxygen-coal ratio and carbon conversion on exergy efficiency and syngas composition under different gasification reaction gas atmospheres were studied by Aspen Plus simulation. The exergy efficiency under different gasification agent atmospheres increases first and then decreases with the increase of oxygen-coal ratio and carbon conversion rate. Using (CO2/O2) as gasification agent has higher exergy efficiency. The composition of syngas changes little under different oxygen-coal ratios, while the overall content of H2, CO and CH4in syngas will increase with the increase of carbon conversion rate, but the growth rate will continue to decline.
Quality and Application Capability Analysis of Production Data ‘Source’ Based on Ubiquitous Power Internet of Things
Authors: Xun Hua , Kou Zheng , Han Jianchun
Published: May 2023

Under the background of digital power grid, in order to deepen the digital application ability of Inner Mongolia power grid, the quality and application ability analysis of production data ' source ' based on pan is carried out to control risk, reduce crisis and realize the credible availability of data. In order to fully grasp the quality of the ' source ' of power grid production data used for interaction, the data of equipment account, technical parameters, maintenance record, test record and defect information in the production management information system are selected, and the quality analysis based on the integrity, correctness and consistency of the data used for interaction is carried out. It is found that there are problems of data ' source ' information error, missing and garbage data. In view of these problems, the decision of data management is put forward, and the suggestions for intelligent operation and inspection management and control of data are put forward, so as to improve the application ability of data and realize the value of data.
Layout Scheme Comparison of the Switching Station of Guoduo Hydroelectric Project Based on AHP-TOPSIS
Authors: Wen Hao , Shi Liu , Wang Yakun , Ni Ting
Published: May 2023

The combination of AHP and TOPSIS can make the evaluation method easy to operate, and improve the objectivity and accuracy of the results. The mathematical model for the switching station scheme optimization was set up to choose an appropriate layout for the Guoduo hydropower station. Through the field survey and literature review, the expert questionnaire was finished. The weights of the index were calculated using the AHP method. Then the improved TOPSIS was employed for the index standardization and the sequencing calculation. The final option of layout 2 was obtained.
Feasibility Study on A Novel Waste Heat Recovery Process of Industrial Waste Salt Based on High Temperature Melting Dry Method
Authors: Zhao Xi , Zhang Shiyi , Ma Haoran , Xie Huaqing , Guo Rui
Published: May 2023

Industrial waste salt is mainly produced by industrial production processes of pesticides, drug synthesis, printing and dyeing, as well as solid-liquid separations, concentration and crystallization of solution, and sewage treatment, etc. At the present stage, the annual output of waste salt in China has exceeded 2.0×107 tons and the high-temperature melting method is considered to be a promising treatment method, but there are problems such as molten salt adhesion and agglomeration, unused high-temperature sensible heat, and waste of water resources. A novel process for waste heat recovery by high temperature melting dry method is proposed in this paper, using a combination of centrifugal granulation and waste heat recovery to dispose high-temperature molten salt and effectively recover heat. Through thermal equilibrium analysis and calculation, the waste heat recovering efficiency of the waste heat recovery using the novel process can reach up to 98%. Taking the annual treatment of 100,000 tons of waste salt as an example, the benefits of effective heat recovery converted to standard coal could be approximately 5 billion. While efficiently utilizing waste heat resources, the novel process brings considerable economic benefits to enterprises, has good industrial application prospects, and helps to advance the process of national hazardous waste solid waste treatment.
Modeling optimization for a typical VOCs thermal conversion process
Authors: Zhuo Wencai , Dai Baiqian , Zhang Kaibing , Yu Yunpeng , Zhang Zhicheng , Zhou Hailiang , Zhou Bin
Published: May 2023

Aiming at the current environmental problems, the thermal oxidation treatment for industrial VOCs emission is a common and effective measure. This paper studies on the optimization effect of one optimization method for direct VOCs thermal oxidation of a color aluminum spraying production line based on Aspen-Plus. According to the direct VOCs thermal oxidation process with a 30000 m³/h circulating air volume, propose the flue gas reflux and coating room drainage technology. Use the second law of thermodynamics, and the exergy flow analysis shows the methane consumption could be reduced 12%. Carbon emissions also decreased significantly, with 3.42% reduction. These findings are practical for industrial production cost saving and environmental protection problems solving.
Drying Characteristics and Odor Concentration in Tail Gas in Vacuum Drying of Municipal Sewage Sludge
Authors: Sun Xiaofeng , Ge Shifu , Yu Yang , Zhu Qixiang
Published: May 2023

As one of the most common solid wastes, municipal sewage sludge needs to be dried before its disposal and resource reuse. In this study, the effects of vacuum degree, heat source temperature and sludge thickness on drying rate and odor concentration in tail gas were studied through orthogonal experiments carried out on the lab-scale vacuum heat-conductive sludge drying device; The effects of heat source temperature on drying rate and odor concentration in tail gas were studied through comparative experiments of atmospheric state and vacuum state (-0.08MPa). The results show that the sludge thickness is the main factor affecting the sludge static drying rate, and the vacuum degree is the main factor affecting the odor concentration in the tail gas of sludge static drying. Under vacuum state (-0.08MPa), sludge can be dried efficiently while using low-grade heat source. In addition, while maintaining a high drying rate, the odor concentration in the tail gas will also be significantly reduced by reducing the generation of volatile sulphur compounds (VSCs).
First-principles study of the thermal transport properties of superconducting NbN
Authors: Liu Sen , Zhang Xiaoliang , Tang Dawei
Published: May 2023

We investigate the thermal transport properties of NbN by considering three-phonon scattering (3ph), four-phonon scattering (4ph), electron-phonon (ep) scattering, and isotope (iso) scattering. By considering 4ph scattering, we find that 4ph scattering has less effect on the lattice thermal conductivity (κph) within 3-9 THz, while ep scattering has a greater effect on κph which is close to 3ph scattering in this frequency range. When the pressure is increased to 15 GPa, the κph by 148%, which is due to the decrease of the scattering phase space resulting in an increase of phonon relaxation time. We find that the κph of NbN is close to 100 W/mK, which is a potential high thermal conductivity material.
Research on EMC test standard of fuel cell system for standardization development of automobile industry
Authors: Du Lifeng , Yang Yanmei
Published: May 2023

This paper introduces the vehicle fuel cell system and EMC test methods, and systematically analyses the research progress of EMC test standards for the automotive industry and fuel cell system. Taking the air compressor controller of the fuel cell system as an example, this study puts forward a method for formulating the electromagnetic compatibility test standard of the vehicle fuel cell system, and gives suggestions for formulating the relevant series of standards.
Measures to expand the application range of ammonia refrigerant
Authors: Shen Xueming , Feng Xiumin , Gao Enyuan , Zhang Zhongbin
Published: May 2023

To cope with the climate issue, China has clearly stated the goal of carbon peaking and carbon neutrality. Most of the refrigerants currently used are HCFCs and HFCs refrigerants. These refrigerants have high COP and GWP values and can cause a severe impact on the environment. Ammonia refrigerant is an environmentally friendly natural refrigerant, ODP and COP value are zero, and the cost is low, with significant environmental and operational advantages, large unit cooling capacity, moderate condensing temperature, good thermal conductivity, suitable for refrigerator and cold storage refrigeration, but at the same time ammonia is a toxic gas with a strong pungent odor. Studying measures to expand the application range of ammonia refrigerants is conducive to correctly understanding and using ammonia refrigerants and giving full play to the refrigeration potential of ammonia refrigerants. Promoting the utilization of ammonia, a clean energy, and achieve the purpose of environmental protection.
Research progress of Cu/Fe-MOF composites applied in water treatment process
Authors: Du Zhehua
Published: May 2023

With a rapid growth of industry and agriculture, the problem of increasing levels of industrial by-products, organic dyes, drugs and personal care products, pesticides, and insecticides contaminants in the water environment needs to be addressed urgently. Cu-based organic framework material (Cu-MOF) is non-toxic, stable, easy to introduce functional groups and easy to assemble. Fe-based organic framework material (Fe-MOF) is strong in reactivity, fast in electron transfer capability, mostly magnetic and easy to recover, thus the combination of the two composite materials can take advantages of the both. The high efficiency water treatment material with green environmental protection and no secondary pollution was prepared, which had broad application prospect in the field of water treatment. In this paper, the construction and application process of Cu-MOF, Fe-MOF, Cu/Fe-MOF and Cu/Fe-MOF derivatives were reviewed, and the further development of these materials in the field of water treatment was prospected.
Comprehensive evaluation of coal-bearing tight sandstone reservoir logging in the Benxi Formation, east-central Ordos Basin
Authors: Ma Tianlu , Li Xinhu
Published: May 2023

The tight sandstone reservoirs of the Benxi Formation are characterized by low pore and low permeability inhomogeneity, etc. It is important to conduct a comprehensive evaluation study on the characteristics and logging of the tight sandstone reservoirs of the Benxi Formation for exploration and development. The study focuses on the application of imaging logging data such as nuclear magnetic resonance (NMR) and array acoustic wave, combined with conventional logging, to carry out the characterization and comprehensive logging evaluation of coal-bearing tight sandstone reservoirs. The study shows that the rock types of tight sandstone of Benxi Formation include quartz sandstone and rock chip quartz sandstone; the porosity is mainly distributed in (1.5%~4.5%) and the permeability is mainly distributed in (0.01mD~0.3mD). The porosity was solved by NMR logging; the permeability was solved by SDR calculation model; the water content saturation was solved by Indonesian equation considering the influence of mud; and the mud content of logging curve was solved by CGR, all of which achieved good agreement with the results of assay analysis. Various methods were used to discriminate the gas content of the reservoir. The rock brittleness indices calculated using sonic imaging and lithology scanning logs are consistent with each other.
Crystal structure and properties of anhydrous 5-nitroaminotetrazole
Authors: Zhao Chaofeng , Li Shenghua , Pang Siping
Published: May 2023

5-Nitraminotetrazole (5-NAT) is a high-energy and green explosive material that has attracted extensive attention due to its short synthesis steps and decomposition products consisting mainly of nitrogen and water. However, the presence of a crystal water molecule in the current crystal structure of 5-nitroaminotetrazole significantly affects its detonation performance and mechanical sensitivity. In this study, we report the successful synthesis of an anhydrous crystal form of 5-NAT through slow volatilization of an ethyl acetate solution under dry conditions. The anhydrous crystal form of 5-NAT exhibited increased density and detonation velocity compared to the monohydrate crystal form. Furthermore, quantum chemical analysis showed that the anhydrous crystal form exhibited increased sensitivity to external force stimulation due to stronger oxygen-oxygen and nitrogen-oxygen repulsion. In conclusion, the anhydrous crystal form of 5-NAT shows promise as a high-energy and green primary explosive.
Effect of V on the microstructure and mechanical property of Al-Mg-Si alloy by adding Al3V phase
Authors: Liu Xiaorang , Meng Yi
Published: May 2023

The effect of V microalloying on the microstructure and mechanical properties of Al-Mg-Si wrought aluminum alloy by adding the Al-4V (wt.%) master alloy containing the single type of Al3V phases was studied by optical microscope, scanning electron microscope and energy spectrum analysis. The results showed that adding V into the Al-1.6Mg-1.2Si (wt.%) alloy by means of Al3V phases significantly refined the as-cast alloy structure and reduced the grain size by 3.30%. During homogenization heat treatment, dispersed spherical V-containing phase precipitated from the matrix and strongly inhibited the recrystallization grain growth during the T6 heat treatment. The mechanical properties of T6 alloy was improved significantly when the minor V was added by means of Al3V phases, with the tensile strength (UTS) and yield strength (YS) increased by 1.21% and 2.42% respectively while elongation (EL) increased significantly by 130%.
Research progress on low-concentration methane oxidation using palladium-based catalysts
Authors: Du Zhehua
Published: May 2023

There is low concentration (0.05% to 0.5%) of CH4 leakage in marine natural gas engine exhaust. It is difficult to capture and utilize low concentration CH4 because of its stable chemical structure and high ignition temperature. Catalytic oxidation is the main method to remove low concentration CH4 from tail gas. The noble metal palladium (Pd) is the best catalytic material for the complete oxidation of low concentration CH4. In this paper, the main research progress of Pd-based catalysts is reviewed for their low-temperature activity, reliability and development cost. Initially, the impact of Pd particle dimensions and valence distribution, Pd dispersion, carrier identity and strong metal-carrier interaction (SMSI) on the catalyst's methane oxidation activity was elucidated. Then, the mechanism of methane oxidation on the surface of Pdbased catalysts is summarized; In addition, the deactivation mechanisms of Pd-based catalysts, such as high temperature sintering, water poisoning and sulphur poisoning, are described in detail. In conclusion, the major hurdles encountered in achieving full oxidation of methane at low concentrations are outlined, along with the future development direction for methane oxidation catalysts. Additionally, strategies to enhance the performance of Pd-based catalysts are briefly suggested. The modified Text maintains a clear, professional, and concise style with minimal changes.
Does Antenatal MgSO4 Administration to the Mother in the Event of Imminent Premature Birth Reduce the Occurrence of Infantile Cerebral Palsy in the Child? –
An Umbrella Review
Authors: Binder Charlotte , Schmid Pauline , Abele Harald , Graf Joachim
Published: May 2023

Introduction Premature births have a significantly increased risk of developing cerebral palsy. This clinical picture involves great restrictions and impairments in the lives of
the children and their families. Its prevention is therefore of great importance. One method of neuroprotection to reduce the rate of infantile cerebral palsy is the antenatal
administration of magnesium sulfate to the mother. The aim of this paper is to present the current state of research of existing reviews and meta-analyses on the topic and to review the
evidence for this intervention.

Material and Methods A literature search was conducted within the framework of an umbrella review in the electronic database PubMed in February 2022 to identify all relevant
publications on the topic. The search was structured using the PRISMA statement. The important methodological characteristics and the results of the studies were then extracted. In
addition, a quality assessment of the studies was performed using the AMSTAR score.

Results Two systematic reviews with meta-analysis, one systematic review, and one individual participant data meta-analysis were included in this study. The total number of
subjects was n = 6178. The publications conclude that the antenatal administration of magnesium sulfate to the mother significantly reduces the risk of cerebral palsy in preterm infants.
Due to the high quality of 3 of the 4 studies, a high level of evidence can be assumed.

Conclusion The evidence for antenatal magnesium sulfate administration for the prophylaxis of cerebral palsy in preterm infants is high. However, further research is needed to
determine which doses of magnesium and up to which gestational age the administration is useful.
The Use of Intracardiac Echocardiography in Transjugular Intrahepatic Portosystemic Shunt Procedure
Authors: Bayona Molano Maria del Pilar , Rice Samuel
Published: May 2023

Transjugular intrahepatic portosystemic shunt (TIPS) is a complex intervention with a steep learning curve that requires centers of expertise to improve technical success and reduce complications. Portal venous access is the most challenging step of the procedure and requires planning and image guidance strategies to prevent vascular or bile duct injury and further complications. Intracardiac echocardiography (ICE) has been reported to be a safe and accurate tool that provides images of the portal vein anatomy in real time. The use of ICE has become the standard of care in several centers. It is now frequently used to target the portal vein in complex TIPS procedures. This review article describes some technical aspects and indications of ICE-guided TIPS.
Smaller Diameter and Adjustable Diameter Transjugular Intrahepatic Portosystemic Shunts
Authors: Gupta Aakash N. , Sze Daniel Y. , Rigas Diamanto Amanda
Published: May 2023

Complications of overshunting, including hepatic encephalopathy and hepatic insufficiency, remain prevalent following transjugular intrahepatic portosystemic shunt (TIPS) creation. Smaller diameter TIPS may reduce the risk of overshunting, but the use of smaller stents must be weighed against the risk of undershunting and persistent or recurrent hemorrhage, ascites, and other complications of portal hypertension. This article explores the question of optimal shunt diameter by examining outcomes for smaller diameter TIPS stent-grafts (<10 mm), underdilated stent-grafts, and variable diameter stent-grafts.
Possible Triggers of Supraventricular Tachycardia in a Toddler Rescued from a Garage Fire: A Case Report
Authors: Shaw Susanna , Rafaat Karim , Frugoni Brian
Published: May 2023

We describe the case of a previously healthy toddler with the finding of supraventricular tachycardia after being rescued from a garage fire. The patient's initial presentation was concerning for inhalational injury and a 2% total body surface area burn to the forehead. Additionally, the patient was noted to be extremely agitated in the trauma bay. Given the patient's agitation and the mysterious circumstances surrounding the fire, a urine toxicology was performed shortly after admission and was positive for cocaine. Passive cocaine inhalation, possibly during the fire, is a likely explanation for the child's arrhythmia.
UK mutual funds: performance persistence and portfolio size
Authors: Cuthbertson Keith , Nitzsche Dirk , O’Sullivan Niall
Published: May 2023

We re-examine performance persistence amongst UK mutual funds. Specifically, we investigate performance persistence amongst small portfolios of past high-performing funds. In contrast to the more common analysis of decile portfolios of funds, we focus on persistence in the more extreme positive tail of the cross section of fund performance. This paper contributes to the smaller literature on UK rather than US mutual fund performance. We investigate fund persistence based on practitioner index models as well as academic factor models, focusing on small portfolios of funds using inference based on nonparametric persistence test statistics as well as conventional t tests. We provide strong evidence of positive persistence amongst small-size portfolios of (past) high-performing funds that is robust to alternative formation and holding periods and alternative performance models. We also document some sensitivity in inferences on positive persistence when using nonparametric versus conventional tests.
International taxation and the organizational form of foreign direct investment
Authors: Amberger Harald J. , Kohlhase Saskia
Published: May 2023

We investigate the relation between international taxation and the organizational form of foreign direct investment (FDI). Using micro-level data on inbound FDI relations in Germany, we find that a higher tax burden on income earned in a corporate subsidiary increases the probability that a multinational corporation (MNC) conducts foreign investment through a non-corporate flow-through. This effect is economically meaningful and varies with the relative importance of tax-motivated income shifting, a subsidiary’s non-tax benefits of limited liability and legal independence, and an MNC’s local knowledge. Moreover, we examine potential real effects of organizational form choices and document that affiliates established as flow-throughs exhibit a lower loss propensity and are less profitable than affiliates established as subsidiaries. Taken together, our findings inform policy makers about the potential response of MNCs to tax-law changes and suggest that the chosen organizational form can shape the future characteristics of investments abroad.
Generating ultrashort visible light pulses based on multidimensional solitary states in gas-filled hollow core fiber
Authors: Kumar Mayank , Arshadipirlar Maghsoud , Safaei Reza , Ibrahim Heide , Légaré François
Published: May 2023

Multidimensional solitary states (MDSS) are self-sustaining light wave packets confined in multiple dimensions in multimode fibers. In this work, we experimentally demonstrate the generation of MDSS, driven by a few hundreds of femtoseconds (fs) of long frequency doubled pulses from a Titanium:Sapphire chirped pulsed amplifier in a nitrous oxide-filled hollow core fiber (HCF). The MDSS output, resulting from intermodal interactions in a Raman-active gas-filled large core diameter HCF, features a broadband, red-shifted spectrum in the visible spectral region with a characteristic negative quadratic spectral phase. Therefore, the output with broadband spectra and negative chirp results in the generation of sub-30 fs pulses upon propagation through glass windows and a spectral filter. Backed with experimental observations and multidimensional simulations, we demonstrate that the sign of the frequency chirp of input pulses influences the spectral broadening in the HCF in the high gas-dispersion regime. We observed that the MDSS red-shifted pulses have a clean spatial profile. Therefore, the experimental requirements on the input beam size and quality to achieve a clean MDSS beam profile at the output of large core HCFs can be relaxed. Hence, this work extends the validation of the MDSS phenomenon toward the ultraviolet-visible region of the electromagnetic spectrum, thus providing an alternate source with a clean spatial beam profile for various applications in the field of ultrafast spectroscopy.
Beltrami fields in partially ionized magnetized dusty plasma
Authors: Ahmed Faheem , Iqbal M. , Shazad Usman
Published: May 2023

The relaxed state of a magnetized four-component partially ionized dusty (PID) plasma is explored. PID plasma is composed of inertial electrons, positive ions, neutrals, and static negatively charged dust particles. When the neutrals are dragged along with the ions, the steady-state solution of vortex dynamic equations for inertial electron and ion species yields a triple Beltrami relaxed state, which is a linear combination of three single force-free fields and is characterized by three self-organized structures. The impact of plasma parameters such as Beltrami parameters and neutral (degree of ionization) and dust species densities on the nature of the relaxed state is investigated. Furthermore, the role of scale separation and its implication in space plasma are also presented. The present research will aid in elucidating the role of neutral and dust species in space, astrophysical, and laboratory plasmas.
Spectrally tunable ultrashort monochromatized extreme ultraviolet pulses at 100 kHz
Authors: Csizmadia Tamás , Filus Zoltán , Grósz Tímea , Ye Peng , Gulyás Oldal Lénárd , De Marco Massimo , Jójárt Péter , Seres Imre , Bengery Zsolt , Gilicze Barnabás , Lucchini Matteo , Nisoli Mauro , Frassetto Fabio , Samparisi Fabio , Poletto Luca , Varjú Katalin , Kahaly Subhendu , Major Balázs
Published: May 2023

We present the experimental realization of spectrally tunable, ultrashort, quasi-monochromatic extreme ultraviolet (XUV) pulses generated at 100 kHz repetition rate in a user-oriented gas high harmonic generation beamline of the Extreme Light Infrastructure—Attosecond Light Pulse Source facility. Versatile spectral and temporal shaping of the XUV pulses is accomplished with a double-grating, time-delay compensated monochromator accommodating the two composing stages in a novel, asymmetrical geometry. This configuration supports the achievement of high monochromatic XUV flux (2.8 ± 0.9 × 1010 photons/s at 39.7 eV selected with 700 meV full width at half maximum bandwidth) combined with ultrashort pulse duration (4.0 ± 0.2 fs using 12.1 ± 0.6 fs driving pulses) and small spot size (sub-100 µm). Focusability, spectral bandwidth, and overall photon flux of the produced radiation were investigated, covering a wide range of instrumental configurations. Moreover, complete temporal (intensity and phase) characterization of the few-femtosecond monochromatic XUV pulses—a goal that is difficult to achieve by conventional reconstruction techniques—has been realized using a ptychographic algorithm on experimentally recorded XUV-infrared pump–probe traces. The presented results contribute to in situ, time-resolved experiments, accessing direct information on the electronic structure dynamics of novel target materials.
Alkaloids from the entheogenic plant Peganum harmala
Authors: Anstis Daniel G. , Liyu Jessica , Davison Emma K. , Sperry Jonathan
Published: May 2023

Entheogenic natural products (e.g., psylocybin and dimethyltryptamine) are emerging as effective therapeutics to treat debilitating mood disorders that are unresponsive to conventional treatment. The detailed evaluation of psychotropic plants will conceivably lead to the discovery of structurally distinct entheogens that may offer improved or complementary medicinal properties to the classic entheogens. The plant Peganum harmala has a rich history in traditional medicine, with consumption inducing a host of central nervous system (CNS) symptoms, including hallucinations. Given alkaloids are uniquely capable of altering the CNS physiology owing to their ability to cross the blood–brain barrier, the natural product(s) responsible for the entheogenic properties are likely hidden in its structurally diverse alkaloid profile. Herein, an overview of the 160 alkaloids isolated from P. harmala is provided. Remarkably, bioactivity data is scarce, limited to inhibition of monoamine oxidases and cholinesterases in a few cases, with the majority having no reported bioactivity at all. As none of the classic entheogens have been detected in P. harmala, this collection of alkaloids provides a useful reference point in the search of structurally unique entheogens.
Research on the inverse kinematic algorithm of the robot arm of the minecart
Authors: Jiang Zhihong , Yu Zhijian , Zhang Xiaoyang
Published: May 2023

A reverse kinematics solution algorithm for the robot arm of the minecart is proposed based on the structure and motion characteristics of the robot arm, the geometric method is combined with the algebra method, and the trajectory of each joint point on the mechanical arm is calculated inversely by using the motion trajectory of the roller on the mining wheel to reverse-calculate the trajectory of each joint point on the mechanical arm, and the joint angle of the mechanical arm is obtained according to the trajectory of each joint point. The results are compared and analyzed through the Robots Toolbox toolbox in Matlab to verify the correctness and validity of the inverse calculation results. It lays a foundation for future research on key issues such as path planning and trajectory tracking control of the robot arm of the minecart.
Numerical Simulation on Water Jet Oil Cleaning inside Pressure Gauges
Authors: Ye Jiaxing
Published: May 2023

Pressure measuring instruments in the process of use, the accumulation of oil and dust will produce irreversible harm to the pressure instrument. High-pressure water jet cleaning technology to clean the oil can clean off most of the dirt. Now, based on the VOF multiphase flow model, the k-ε turbulence model is simulated for the jet flow rate, and the efficiency of oil flushing by different velocities and different frequency jets is quantitatively studied by numerical simulation for different working conditions. With the increase in speed, the higher the efficiency of oil cleaning; when the pulsating jet input is used, the frequency and cleaning efficiency are not proportional. The pulsating jet has more advantages in cleaning efficiency compared to the constant flow.
Numerical simulation of flow velocity measurement in mono/cross sound roads by time difference method
Authors: Ye Jiaxing
Published: May 2023

This paper mainly focuses on the numerical simulation research of the time-difference method ultrasonic flowmeter. The time-difference method is used to measure the flow rate of fluid in the main flow pipeline, and the calculation time-difference and numerical simulation time-difference are compared under several conditions of mono-and cross-sound circuit respectively, which verifies the reliability of numerical simulation time-difference. The comparison between the time difference measured by mono and cross channels verifies that increasing the measurement sound path can improve the measurement accuracy. At the same time, the measurement accuracy of mono-path and cross-path under different conditions is compared, and it is found that the cross-path is more suitable for the measurement of fast flow rate, and its measurement accuracy increases with the increase of flow rate.
Study on Temperature Measurement Model of Rare Earth Metal Electrolysis Based on Infrared Image
Authors: Zang XiaoLong , Tao LiKe , Qin Yun , Hu Zhenguang
Published: May 2023

The temperature of rare earth electrolysis plays an important role in the process of electrolysis control. It is the main parameter to control the efficiency of electrolysis. In production practice, most of the process parameters are controlled by the artificial thermocouple temperature measurement method. This extensive technical management method greatly affects the accuracy of production control. And the traditional thermocouple temperature measurement is artificial and slow, not timely, short life, and has other issues. Therefore, it is extremely urgent to explore a continuous and safe surface temperature measurement method to achieve precise control of process parameters. Therefore, based on the principle of infrared temperature measurement, this paper introduces the theory of infrared temperature measurement, uses Matlab software to extract the average gray value of the infrared image, and obtains the infrared temperature measurement model by least square method and bp neural network for temperature and gray fitting curve. At the same time, the experimental data are measured, and the model is verified. This method provides a reference for online temperature measurement of electrolytic molten metal.
Modeling on flexible variable topology mechanism based on the Kane method
Authors: Liu Peng , Fan Fengchen , Geng Ruihai , Gao Zhihui
Published: May 2023

In recent years, with the development of space science and technology and the deepening of space exploration, a new type of institution with variable topology, variable topology, with its flexibility to adapt to the environment and diversity of tasks, has become an important development direction of multi-purpose and highly integrated complex space institutions in our country. Therefore, it is very important to study the dynamic problems of this kind of flexible variable topology mechanism and explore the methods and means to improve the dynamic performance, which meets the major requirements of the development of Chinese space science and technology. In this paper, a rigid-flexible coupling manipulator system that can realize the conversion of single and two degrees of freedom is studied. The full-structure nonlinear dynamics model of the manipulator is established by using the Kane method.