bluuebunny/crossref_metadata_2025_split huggingface dataset:
An integral sliding‐mode parallel control approach for general nonlinear systems via piecewise affine linear models
Authors: Zhang Chunyang , Gao Qing , Deng Yue , Qiu Jianbin 
Published: February 2023

AbstractThe fundamental problem of stabilizing a general nonaffine continuous‐time nonlinear system is investigated via piecewise affine linear models (PALMs) in this article. A novel integral sliding‐mode parallel control (ISMPC) approach is developed, where an uncertain piecewise affine system (PWA) is constructed to model a nonaffine continuous‐time nonlinear system equivalently on a compact region containing the origin. A piecewise sliding‐mode parallel controller is designed to globally stabilize the PALM and, consequently, to semiglobally stabilize the original nonlinear system. The proposed scheme enjoys three favorable features: (i) some restrictions on the system input channel are eliminated, thus the developed method is more relaxed compared with the published approaches; (ii) it is convenient to be used to deal with both matched and unmatched uncertainties of the system; and (iii) the proposed piecewise parallel controller generates smooth control signals even around the boundaries between different subspaces, which makes the developed control strategy more implementable and reliable. Moreover, we provide discussions about the universality analysis of the developed control strategy for two kinds of typical nonlinear systems. Simulation results from two numerical examples further demonstrate the performance of the developed control approach.
Structural, Spectral, and Electrochemical Investigations of a Nitrogen‐Doped N‐rGO/MgCo2O4 Nanocomposite for Supercapacitor Applications
Authors: Vignesh Gopal , Ranjithkumar Raju , Devendran Pazhanivel , Nallaperumal Nallamuthu , Sudhahar Sakkarapani , Kumar Muthusamy Krishna 
Published: February 2023

AbstractThe hybrid nitrogen doped N‐rGO/MgCo2O4 nanocomposite was studied for supercapacitor electrodes. Hydrothermal and reflux process was adopted for N‐rGO and for nanocomposite respectively. GO/MgCo2O4, MgCo2O4 physical and chemical properties were used to compare to understand the enhancements made by nitrogen doping. Phase purity of N‐rGO/MgCo2O4, GO/MgCo2O4 nanocomposites and MgCo2O4 were studied. Raman and FTIR spectra were used to confirm the reduction of graphene oxide, nitrogen doping inN‐rGO and its nanocomposites. SEM and EDX analysis revealed the morphology and the elements in the synthesized nanomaterials. The electrochemical performance of all the nanocomposites were studied in 1 M KOH electrolyte. Cyclic voltammetry, charge‐discharge, impedance spectra, cyclic stability of N‐rGO/MgCo2O4, GO/MgCo2O4, MgCo2O4 results have been discussed. The energy and power density have been compared. N‐rGO//N‐rGO/MgCo2O4 asymmetric supercapacitor device was fabricated and studied. It exhibits an energy, power density of 3750 Wh Kg−1, 28.3 W Kg−1 and the results have been presented.
TaCl5‐Catalyzed Amidation of Carboxylic Acids with Amines
Authors: Gabdullin Azat M. , Kadikova Rita N. , Mozgovoj Oleg S. , Ramazanov Ilfir R. 
Published: February 2023

AbstractThe reaction of alkyl‐ and aryl‐substituted carboxylic acids with primary and secondary amines under the action of 0.2 equiv. TaCl5 leads to selective formation of carboxylic acid amides of various structures. TaCl5‐catalyzed formation of amides was demonstrated to proceed equally selectively both in toluene and methylene chloride, hexane, diethyl ether and 1,4‐dioxane solutions.
Synthesis of Selagibenzophenone A and Its Derivatives for Evaluation of Their Antiproliferative, RORγ Inverse Agonistic, and Antimicrobial Effect**
Authors: Lapinskaite Ringaile , Atalay Hazal Nazlıcan , Malatinec Štefan , Donmez Serhat , Cinar Zeynep Ozlem , Schwarz Patrik F. , Perhal Alexander F. , Císařová Ivana , Labanauskas Linas , Karpiński Tomasz M. , Dirsch Verena M. , Tumer Tugba Boyunegmez , Rycek Lukas 
Published: February 2023

AbstractWe report a modular synthetic approach towards novel derivatives of the naturally occurring arylated benzophenone selagibenzophenone A. The initial strategy for the construction of the carbon framework of the derivatives relied on the Suzuki reaction of 2,4,6‐tribromobenzonitrile, and the addition of the aryl lithium species to nitrile to generate imine. However, the formed imines showed remarkable stability toward hydrolysis. Therefore, Suzuki cross‐coupling was carried out with 2,4,6‐tribromobenzaldehyde and the subsequent addition of organometallic species to the aldehyde. Oxidation of the resulting alcohol ensured the access to desired ketones. The importance of the developed modular strategy is underlined by the discovery of several derivatives with selective cytotoxic effects and potential anti‐inflammatory activity superior to the effect of the natural product.
Alkylboronate β‐Phenylglucoside versus Phenylboronate β‐Alkylglucoside Organogelators
Authors: Ludwig Andreas D. , Gorbunova Viktoriia , Saint‐Jalmes Arnaud , Berrée Fabienne , Lemiègre Loïc 
Published: February 2023

AbstractLow molecular weight organogelators provide useful materials which have already found applications in various fields. Recently, phenylboronate alkylglucosides have become new members of this type of organogelators providing water‐sensitive gels. This work is focused on the impact of the position of alkyl and phenyl moieties within this type of structures. Thus, alkylboronate phenylglucoside and alkylboronate alkylglucoside counterparts were synthesized and studied. Organogels obtained in toluene and ethyl myristate were characterized by rheology and electron microscopy. In addition, we also determined the disruption rates of such organogels upon addition of a small amount of water. Alkylboronate alkylglucosides did not induce gelation of the tested solvents but all derivatives bearing a phenyl ring either on the boronate function or on the glucoside unit came out as good organogelators. However, alkylboronates were found to have higher water sensitivities than phenyl counterparts. Thus, this work has enlarged the scope of glucoside‐boronate organogelators and their water sensitivity which can represent useful materials in drug delivery systems for example.
Fully‐Solution‐Processed Enhancement‐Mode Complementary Metal‐Oxide‐Semiconductor Carbon Nanotube Thin Film Transistors Based on BiI3‐Doped Crosslinked Poly(4‐Vinylphenol) Dielectrics for Ultralow‐Power Flexible Electronics
Authors: Li Min , Fang Yuxiao , Shao Shuangshuang , Wang Xin , Chen Zhaofeng , Li Jiaqi , Gu Weibing , Yang Wenming , Xu Wanzhen , Wang Hua , Zhao Jianwen 
Published: February 2023

AbstractThe threshold voltage (Vth) adjustment of complementary metal‐oxide‐semiconductor (CMOS) thin film transistors (TFTs) is one of the research hotspots due to its key role in energy consumption control of CMOS circuits. Here, ultralow‐power flexible CMOS circuits based on well‐matched enhancement‐mode (E‐mode) CMOS single‐walled carbon nanotube (SWCNT) TFTs are successfully achieved through tuning the work function of gate electrodes, electron doping, and printing techniques. E‐mode P‐type CMOS SWCNT TFTs with the full‐solution procedure are first obtained through decreasing the work function of Ag gate electrodes directly caused by the deposition of bismuth iodide (BiI3)‐doped solid‐state electrolyte dielectrics. After synthetic optimization of dielectric compositions and semiconductor printing process, the flexible printed E‐mode SWCNT TFTs show the high Ion/Ioff ratios of ≈106, small subthreshold swing (SS) of 70–85 mV dec−1, low operating voltages of ≈0.5 to −1.5 V, good stability and excellent mechanical flexibility during 10 000 bending cycles. E‐mode N‐type SWCNT TFTs are then selectively achieved via printing the polarity conversion ink (2‐Amino‐2‐methyl‐1‐propanol (AMP) as electron doping agent) in P‐ type TFT channels. Last, printed SWCNT CMOS inverters are successfully constructed with full rail‐to‐rail output characteristics and the record unit static power consumption of 6.75 fW µm−1 at VDD of 0.2 V.
Soil hydraulic conductivity in the state of nonequilibrium
Authors: Vogel Hans‐Jörg , Gerke Horst H. , Mietrach Robert , Zahl René , Wöhling Thomas 
Published: February 2023

AbstractHydraulic nonequilibrium in soil during water infiltration and drainage is a well‐known phenomenon. During infiltration, water initially invades easily accessible pores before it slowly redistributes towards some state of energetic minimum. In analogy, during drainage, easily drainable pores are emptied more rapidly than those blocked by bottlenecks. The consequence is that the water content is lagging behind the water potential and both state variables do not follow a unique water retention curve as typically assumed when applying Richards equation. Current models that account for nonequilibrium allow for the required decoupling of water content and water potential; however, they do not consider the consequences for the hydraulic conductivity. In this contribution, we present a physically based approach to estimate hydraulic conductivity during nonequilibrium, which depends on both water content and water potential during nonequilibrium conditions. This approach of a dynamic hydraulic conductivity function is demonstrated for an infiltration process into relatively dry soil and for a stepwise drainage and rewetting with decreasing and increasing water fluxes (i.e., multistep flux experiment). The new approach reproduces well‐known phenomena such as pressure overshoot and preferential flow across infiltration fronts using a unified concept for hydraulic conductivity. This was not possible with existing models assuming some fixed unsaturated conductivity function depending on either water content or water potential.
How cells sense and integrate information from different sources
Authors: Ullo Maria F. , Case Lindsay B. 
Published: February 2023

AbstractCell signaling is a fundamental cellular process that enables cells to sense and respond to information in their surroundings. At the molecular level, signaling is primarily carried out by transmembrane protein receptors that can initiate complex downstream signal transduction cascades to alter cellular behavior. In the human body, different cells can be exposed to a wide variety of environmental conditions, and cells express diverse classes of receptors capable of sensing and integrating different signals. Furthermore, different receptors and signaling pathways can crosstalk with each other to calibrate the cellular response. Crosstalk occurs through multiple mechanisms at different levels of signaling pathways. In this review, we discuss how cells sense and integrate different chemical, mechanical, and spatial signals as well as the mechanisms of crosstalk between pathways. To illustrate these concepts, we use a few well‐studied signaling pathways, including receptor tyrosine kinases and integrin receptors. Finally, we discuss the implications of dysregulated cellular sensing on driving diseases such as cancer.This article is categorized under:
Cancer > Molecular and Cellular Physiology
Metabolic Diseases > Molecular and Cellular Physiology
Study on Frost Resistance of Steel-PVA Hybrid Fiber Concrete
Authors: Niu Ditao , Gong Siyu , Guo Bingbing , Cao Zhiyuan , Wang Yan 
Published: February 2023

AbstractFreeze–thaw damage in cold areas is an important reason for the deterioration of durability of concrete structures, and the addition of fiber can effectively improve the frost resistance of concrete. To study the effect of steel fiber and polyvinyl alcohol (PVA) fiber on the frost resistance of concrete, an orthogonal experimental method was applied to analyze the frost resistance of steel-PVA hybrid fiber concrete. The effect of the steel fiber content, PVA fiber content, and steel fiber types were investigated on the mass-loss rate and relative dynamic elastic modulus of fiber concrete, to explore the mechanism of high frost resistance of it. The results show that steel fiber content has a significant effect on the mass-loss rate and relative dynamic elastic modulus of fiber concrete. The influence of PVA fiber content on the relative dynamic elastic modulus is relatively great, and the influence of steel fiber types of the mass-loss rate is the same. The frost resistance of concrete can be improved by adding hybrid fiber in concrete. When 1.0% End-hook steel fibers and 0.3% PVA fibers are added, the concrete specimen has the best frost resistance.
Experimental and Numerical Investigation of Weak-Axis Connected Steel Plate Shear Wall with Non-slotted and Partially Slotted Infill Plates
Authors: Hao Jiping , Wu Xinghuang , Tian Weifeng , Li Shenghui , Wang Rong 
Published: February 2023

AbstractAll Components with H-shaped section are widely used in steel structures, in which the connection of beam section to column flange (i.e. weak-axis connection) is inevitable. In order to study the mechanical properties of weak-axis connected steel plate shear walls, a 1/3 scaled steel plate wall specimen was designed and subjected to a cyclic test to investigate the properties of stiffness, strength, ductility and energy dissipation. On the basis of this, the partially slotted steel plate shear wall was proposed. The FE model of the test specimen was developed and verified with the test results by FE software Abaqus. Subsequently, the FE model of the partially slotted steel plate wall was developed to study mechanical properties by comparing it with the test specimen. The analysis results show that the partially slotted infill plate can fully play the tension field and avoid the beam’s in-span bending, which effectively improves the structural ductility and energy consumption. Although the partially slotted infill plate will weaken the lateral resistance, the partially slotted SPSW still accounts for 75% of that one without slots in lateral bearing capacity. Additionally, the ductility of this partially slotted one is up to 5.79, and its equivalent viscous damping ratio reaches 30%.
Full-Permeability Analysis of Normal Amplitude and Variable Amplitude Fracture of M24 High Strength Bolts
Authors: Xing Rong , Zhang Junjie , Lei Honggang 
Published: February 2023

AbstractFatigue problem on high strength bolts have already become more and more important in morden times and it is essential that we do research on bolt fatigue mechanism by the fatigue fracture analysis of the failed bolt because of fatigue. Through detailed analysis of constant amplitude stress and variable amplitude stress on M24 high strength large hexagonal head bolts, it is concluded that there are three common failure mode among all bolts’ fatigue failure. Fatigue failure characteristics and fracture developing status of source region, transient broken zone and extension zone were obtained, and it provides a important basis for the study on fatigue performance and life estimation of high strength bolt connection, and meanwhile it also expands the application range of bolt joint of prefabricated steel structure.
Finite Element Analysis of Anchor Length Detection Method Based on Parallel Seismic Methods
Authors: Hu Yi , Cao Hong Lin , Liu Qiang , Li Xian 
Published: February 2023

AbstractAs an important component of the tunnel support structure, the effective length and compactness of the anchors have a direct impact on the load-bearing capacity and safety. Anchor reinforcement is characterised by rapid construction and concealment. Traditional tension tests are difficult to meet the current requirements for quality control in engineering construction. In recent years, elastic wave anchor non-destructive technology has gradually emerged and achieved certain results, but still cannot solve the identification of anchor lengths in long anchor rods and complex surrounding rock conditions. In this study, the theory of parallel seismic methods is applied to the verification of anchor length by drawing on the technical means of pile foundation detection. The feasibility of the implementation of the method is verified by simulating the anchor-anchor solid-surrounding rock elastic wave conduction system using ABAQUS to analyse the anchor length detection process.
Numerical Simulation of Rockburst Characteristics of Tunnel Surrounding Rock Under Dilatancy Effect
Authors: Yu Jian-qiang , Li Qi , Wang Yong-lu , Tao Shuai 
Published: February 2023

AbstractRockburst is one of the most intense reactions in various instability phenomena of underground cavern surrounding rock, which seriously threatens the safety of underground engineering construction personnel and equipment. Based on Mohr–Coulomb strain softening model, the non-associated flow rule is adopted for plastic flow after material yield. By implanting Gu Ming-cheng and Tao Zhen-yu rockburst criterion in the software, the effects of different dilatancy angles on rockburst grade and circumferential stress distribution of surrounding rock of circular tunnel are simulated. The calculation results show that the larger the dilatancy angle is, the more difficult the rock burst pit is to form. The elements of serious rockburst are mainly concentrated in the wall of the tunnel, and the shear bands formed in the high value area of shear strain increment are short. When the dilatancy angle is small, the circumferential stress reaches the maximum at the interface of elastic-plastic zone. With the increase of dilatancy angle, the number of elements entering the plastic state and occurring medium and severe rockburst increases first and then decreases, while the number of elements occurring slight rockburst decreases monotonously. Different dilatancy angles have significant effects on the number of elements occurring rockburst at all levels.
Analysis of the Influence of Foundation Pit Excavation on the Surrounding Surface Settlement and Retaining Structure
Authors: Shou LingChao , Zhao HeQuan , Sun XiaoBo , Pang Jin , Bao Ting , Wang LiFeng 
Published: February 2023

AbstractThis paper analyzes the foundation pit of Gen Shan East Road through tunnels under the river. The results show: When digging to the bottom, the maximum horizontal displacement of the wall is located at 2 ~ 4 m above the bottom of the pit, and the maximum value is 0.57‰ ~ 0.64‰H. The surface subsidence is mainly of groove type. The maximum surface settlement is 0.107%H. The mean value of the maximum surface settlement is about 0.91 times the maximum horizontal displacement of the wall, and the maximum surface settlement is between 0.58 and 1.91 times the maximum horizontal displacement of the wall.
Numerical Simulation with FLAC3D on Excavation Process of Underground Powerhouse of Kaluma Hydropower Station
Authors: Liu An , Li Hua , Lu Fei , Niu Meifeng 
Published: February 2023

AbstractThe dam site of Kaluma Hydropower Station is located on the Nile River in northern Uganda. It is a diversion power station with a total installed capacity of 600 MW. The gneissic fissures and medium dip fissures in the plant area not only reduce the strength of the rock mass, but also easy to form adverse combinations and cuts, which adversely affecting the stability of the cavern. Therefore, surrounding rock deformation and block instability are the key factors affecting the stability of underground caverns. Based on the field investigation data, according to the research of geological prototypes such as rock mass structural plane investigation and quality classification, this paper uses the finite element numerical analysis software FLAC3D to establish and calculate the numerical model, adjusts the boundary conditions of the model through parameter inversion, and then calculates the stress and strain of each part of the rock mass, so as to evaluate the excavation stability of underground powerhouse construction. The actual situation of construction and excavation verifies the accuracy of numerical analysis and calculation.
Measurement of Velocity and Particle Size in Shock Wave Area Generated by Experimental Granular Flow Impacting on a Cylinder Based on Image Processing Methods
Authors: Xu Jing , Wang Jian , Wang Dongpo , Chen Zheng 
Published: February 2023

AbstractThe measurement of flow velocity and particle size remains an important issue in granular -flow dynamics and can provide important basis to better understand the physics in granular material, particularly when it impacts on a structure. In this study, laboratory chute experiments were performed with quartz-glass particle materials to investigate the characteristics of granular shock developed upstream of a cylinder generated by granular flow impacts. A time series of flow images recorded by a camera has been analyzed and processed using the digital image processing methods such as the gray processing, the image binarization, the image corrosion and expansion, and the generative adversarial networks, with a goal of obtaining flow velocity and particle size in the granular shock area. The experimental results reveal that the granular-flow velocity grows with increasing slope angle. The granular shock thickness shows a general increase with the growing number of particles in the shock area, and the number of particles demonstrates an inversely proportional to increasing Froude number, providing a potential method for determining the particle size of dense granular flow. The findings of this study could help to better understand the shock dynamics of granular flow impacting on an obstacle.
Research on Mechanical Properties of Steel Shell Concrete Immersed Tube Shear Connectors
Authors: Xu Guoping , Huang Qingfei , Song Shenyou , Ji Hai , Deng Bin , Song Tian 
Published: February 2023

AbstractStructural designs of shear connector in immersed tunnel is one of the most significant key technical problems in tunnel designing. According to investigations conducted in Shenzhong Link project, this paper combined numerical simulation methods and experimental verifications and to research effects of shear connector void, stress state, and opening holes on performances of steel–concrete connectors, and also discussed differences of shear slip curves under the influence of factors above, as well as impacts on bearing capacities and stiffnesses of connectors. Through numerical simulations of void and non-void connectors by finite element method, patterns of concrete stress, connector behaviors under tension and compression and shear stresses were analyzed respectively. Additionally, reductions of bearing capacity and stiffness caused by voids and openings which were controlled as variables were discussed. Furthermore, a calculation formula of shear connector bearing capacity is proposed which is in consistent with experimental verifications with considerations of void, stress state and opening. Researches in this paper could provide knowledge for reasonable structural designs of structural connectors in future immersed tunnel engineering construction.
Research on Dam Deformation Monitoring Model Based on BP + SVM Optimal Weighted Combination
Authors: Li Shuangping , Li Yonghua , Zheng Min , Geng Jun , Liu Zuqiang , Shi Bo 
Published: February 2023

AbstractIt is an important means to ensure the safe operation of dam to establish accurate and effective deformation monitoring data analysis and prediction model. In view of the complex conditions in dam safety monitoring, there are many unknown or uncertain factors, and they are difficult to have a single model to apply all problems. The optimal weighted combination method is constructed by combining neural network model and support vector machine model, which is used in the deformation monitoring analysis of concrete dam. The research shows that the prediction results of the optimal weighted combination model are highly consistent with the measured results, and have certain feasibility and practicability in the dam deformation monitoring work.