bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the correlation model between the change of aircraft’s mass center and oil supply flow rates
Authors: Wu Yiting , Zou Xuan , Cui Mengyu , Wang Zhongwei 
Published: August 2021

Abstract
The change of aircraft’s mass center affects the stability and control of flight, and the change of oil mass in the fuel tanks is one of the important factors that lead to the change of the aircraft’s mass center. In this paper, in order to ensure the stability and reliability of the oil supply for engine and minimize the deviation between the aircraft’s mass center and the ideal mass center, a correlation model between the change of aircraft’s mass center and the oil supply flow rates is presented. According to the requirements of the aircraft’s mass center, the optimal oil supply flow rates of each tank can be obtained quickly, and the deviation between the predicted mass center and the ideal mass center can be minimized during flight. The calculation examples show that the maximum deviation between the predicted mass center and the ideal mass center is 0.63μm when the attitude of the aircraft is always unchanged, and it’s 13.6cm when the attitude of the aircraft is constantly adjusted, which can meet the practical requirements. Therefore, the model presented in this paper has a good applicability in solving the problem of oil supply for the mass center’s balance of aircraft.
Numerical Simulation Optimization of Mach Reflection of Near Ground Air Explosion
Authors: Fuyuan Li , Jie Ren , Jianlin Zhong , Xinxin Liu 
Published: August 2021

Abstract
In order to optimize the numerical simulation method of Mach reflection, three numerical simulation schemes of ALE method, LBE method and coupling method are compared based on the finite element analysis software LS-DYNA. The calculation results are compared with the test data of UFC 3-340-02 manual and related literature, and internal comparison is made to put forward the numerical calculation optimization scheme of Mach reflection. The results show that the calculation results of the three schemes are in good agreement with UFC 3-340-02 and test results. When only Mach reflection is considered on a single surface, LBE method is selected. The coupling method and ALE method are selected when considering the interaction of shock wave between non ground objects. When the object is completely or mostly in the Mach reflection region, the calculation time of the coupling method is only one sixth of that of the ALE method. When the effect of the object on the air flow field is strong and the area in the Mach reflection region is small, ALE method is selected.
Research on a 3-DOF Planar Cable-Driven Parallel Robot Based on Fuzzy Adaptive PD Computed Torque Control
Authors: Jiesinuer Ayibule , Shangfeng Pan , Yang Cheng 
Published: August 2021

Abstract
Cable-driven parallel robots (CDPR) with spatial configuration are widely used while ones with plannar configuration are rarely applied. Therefore, this paper studies the modeling and control characteristics of a three degree-of-freedom cable-driven planar parallel robot with great application prospects. Aiming at the shortcomings of the existing control methods towards CDPR, a new method based on fuzzy adaptive PD computing torque control is proposed which contains a reasonable optimal distribution of cable forces. To validate the method, the tracking control simulation research and analysis are carried out for the trajectory of high-order interpolation planning, the results of which show that the control method has favorable dynamic tracking accuracy and mechanical properties. Moreover, compared with the fixed-gain computed torque control, the proposed control method can overcome the influence of model inaccuracy more effectively.
Application of finite element model building and analysis in aerospace shell structure
Authors: Yulong Hu , Ke Xie , Xiaojun Yan 
Published: August 2021

Abstract
Shell parts are widely used in various aerospace products. Whether the design is reasonable will directly affect the product effect. According to the actual structure, the application of ANSYS software to the finite element modeling and analysis of shell parts can provide powerful theoretical analysis and guidance for future structural design. Taking the desulfurization tower as an example, common loads such as gravity load, internal pressure, wind load and seismic load are applied. The stress analysis, strength check and stability check of the desulfurization tower are completed, and the results meet the design requirements.
Characteristic signal based on the combination of empirical mode decomposition method and time series AR model Extraction method
Authors: Bin-Bin Li , Xiang-Dong Li , Xu-Yang Pu , Zhong-Tao Kang , Zong-Yang Li , Hui-Zhuo Zhang , Chen-Xi Chen , Yue Hu 
Published: August 2021

Abstract
In the process of signal decomposition by wavelet theory, the wavelet basis function is artificially selected based on experience, and the method based on empirical mode decomposition is decomposed according to the time scale of the signal itself. The article uses two methods to decompose a certain segmented frequency conversion signal to obtain the intrinsic modal component matrix and the wavelet decomposition coefficient matrix, then calculates the Hilbert time spectrum of the two decomposition matrices. cThe calculations shows that the false information generated by the empirical mode decomposition signal is obviouly more less. Therefore, the empirical mode decomposition method is used to decompose the bearing vibration signal, and the stationary natural mode function obtained is very suitable for establishing an autoregressive AR model to extract the power spectrum of each component for analysis. Finally, the characteristic frequencies of different states of rolling bearings are extracted, which provides support for data-driven fault diagnosis.
Surface Defects Detection of Car Door Seals Based on Improved YOLO V3
Authors: Lv Bo , Zhang Nanfeng , Lin Xintao , Zhang Yanxi , Liang Tianfen , Gao Xiangdong 
Published: August 2021

Abstract
At present, the surface defects of car door seals are generally detected by manual operation, which is inefficient and costly. This paper presents a new detection method to find the surface defects of car door seals with the application of modified YOLO V3 algorithm. Firstly, the K-means clustering algorithm was employed to analyze the number and size of the candidate box of the target detection. Then, the feature pyramid was constructed in the first module of the trunk feature extraction network. Finally, the attention mechanism SE module was added in the output part of darknet53 and two feature gold towers extraction network of the trunk feature. The improved YOLO V3 algorithm was carried out on the defect data set of automobile door seals. The results indicate that compared with the original YOLO V3 algorithm, the improved YOLO V3 mAP reaches 52.71%, increasing by 3.28%.
Three Dimensions Reconstruction of Single-spectrum Multi-X-ray Views of Contraband Based on Space Carving Method
Authors: Ding Tingting , Yuan Jinhao , Lin Xintao , Zhang Nanfeng , Zhang Yanxi , Gao Xiangdong 
Published: August 2021

Abstract
In consideration of imaging principle and sampling process of the X-ray imager, the collected images often appear blurry and noisy. We propose to add image processing in the reconstruction process to optimize the 3D reconstruction surface results of X-ray images in this paper. This paper proposes an automatic image data acquisition method to acquire images. According to the characteristics of X-ray images, an image processing method is drawn up. In this paper, the original image and the processed X-ray image are divided into two groups, and three-dimensional reconstruction is performed respectively, and the visualization effect and reconstruction time of the reconstruction result is compared. Experiments show that the running speed of the program is improved, and the visualization results show that the surface texture refinement and the reconstruction structure of the reconstruction effect after image processing have also been well optimized.
Numerical study of flow characteristics of the blade with different structures
Authors: Li Guoping , Ma Zhenlai , Chen Biwen , Chen Changsheng , Chen Laizuo , Gao Bo 
Published: August 2021

Abstract
In order to study the effect of blade structures on the induced excitation characteristics, two different structures are investigated, which are the blade with special trailing edge and the staggered blade. Firstly, based on the steady numerical simulation, the time-averaged velocity and pressure distribution are obtained at different Re numbers (5×103 and 1×104). Secondly, the unsteady numerical simulation method LES is applied to acquire the transient and complex flow field around the blade. It is found that both two blade structures significantly change the flow characteristics around the blade, especially in the wake flow region. The evident frequency is observed from the frequency spectrums. It is clear that the dominant frequency is originated from the vortex shedding, which is similar to the Karmen vortex street. Finally, the results will be useful for the design of blade with low noise purpose.
Research on Braking in a Turn and Parameter Optimization of Centre-axle trailer combination Based on TruckSim
Authors: Li Bingtao , Chang Sheng , Zhu Xianchao , Yang Meiling 
Published: August 2021

Abstract
This paper uses TruckSim dynamics simulation software to build a non-linear model of a center-axle trailer combination, conducts a braking in a turn simulation to study its braking in a turn stability, and a straight-line braking test was carried out on the train through the built-up centre-axle trailer combination braking performance test system, and the reliability of the simulation model was ensured by comparing the test and simulation results. In order to improve the braking performance of the train, a comprehensive evaluation index for evaluating the braking performance of the train is proposed by taking the structural parameters of the train as the optimization variable. The uniform test method is used to optimize the design of the variables, and the braking in a turn is performed on the high adhesion road. Simulation and analysis results show that the optimization reduces the probability of brake folding and improves braking stability.
The influence of silicon on topographical parameters and mechanical properties of the Ti-Ni-Ta-Si surface alloy synthesized on the NiTi-substrates
Authors: D’yachenko F A , Atovullaeva A A , Yakovlev E V , Meisner L L 
Published: August 2021

Abstract
This work comprises a study of the effect of silicon on the topographical parameters and mechanical properties of the Ti-Ni-Ta-Si surface alloy (SA) synthesized on the NiTi-substrates by the additive thin-film electron-beam method. It was found that the roughness of [Ti-Ni-Ta-Si]SA (~0.095 μm) has a lower value than in [Ti-Ni-Ta]SA (~0.195 μm). The values of the yield strength σ
y
in the surface layers of [Ti-Ni-Ta-Si]SA and [Ti-Ni-Ta]SA are characterized by a gradient decrease from ~4.2 GPa up to ~1.2 and ~1.7 GPa, respectively. During the indentation, evaluation of the deformation behavior (recovered elastic –ε
elast
, and superelastic – εin the surface layers of
SE
, residual plastic – ε
elast
deformation) showed, that in surface layers of [Ti-Ni-Ta-Si]SA and [Ti-Ni-Ta]SA due to an increase of ε
elast
, there was a decrease in ε
SE
up to ~35 and ~22%, respectively (for the NiTi-initial ε
SE
≈ 38%).
3D printing of sacrificial thioester elastomers using digital light processing for templating 3D organoid structures in soft biomatrices
Authors: Carberry Benjamin J , Hergert John E , Yavitt F Max , Hernandez Juan J , Speckl Kelly F , Bowman Christopher N , McLeod Robert R , Anseth Kristi S 
Published: August 2021

Abstract
Biofabrication allows for the templating of structural features in materials on cellularly-relevant size scales, enabling the generation of tissue-like structures with controlled form and function. This is particularly relevant for growing organoids, where the application of biochemical and biomechanical stimuli can be used to guide the assembly and differentiation of stem cells and form architectures similar to the parent tissue or organ. Recently, ablative laser-scanning techniques was used to create 3D overhang features in collagen hydrogels at size scales of 10–100 µm and supported the crypt-villus architecture in intestinal organoids. As a complementary method, providing advantages for high-throughput patterning, we printed thioester functionalized poly(ethylene glycol) (PEG) elastomers using digital light processing (DLP) and created sacrificial, 3D shapes that could be molded into soft (G′ < 1000 Pa) hydrogel substrates. Specifically, three-arm 1.3 kDa PEG thiol and three-arm 1.6 kDa PEG norbornene, containing internal thioester groups, were photopolymerized to yield degradable elastomers. When incubated in a solution of 300 mM 2-mercaptoethanol (pH 9.0), 1 mm thick 10 mm diameter elastomer discs degraded in <2 h. Using DLP, arrays of features with critical dimensions of 37 ± 4 µm, resolutions of 22 ± 5 µm, and overhang structures as small as 50 µm, were printed on the order of minutes. These sacrificial thioester molds with physiologically relevant features were cast-molded into Matrigel and subsequently degraded to create patterned void spaces with high fidelity. Intestinal stem cells (ISCs) cultured on the patterned Matrigel matrices formed confluent monolayers that conformed to the underlying pattern. DLP printed sacrificial thioester elastomer constructs provide a robust and rapid method to fabricate arrays of 3D organoid-sized features in soft tissue culture substrates and should enable investigations into the effect of epithelial geometry and spacing on the growth and differentiation of ISCs.
Insights into effect of first-step austempering temperature on the microstructure and properties of austempered ductile iron
Authors: Zhang Yu , Guo Erjun , Wang Liping , Zhao Sicong , Liu Xiaoyu , Yi Pengyue , Li Yan , Feng Yicheng , Song Meihui 
Published: August 2021

Abstract
Austempered ductile iron (ADI) is a revolutionary material with high strength and hardness combined with excellent ductility and toughness. The discovery of a two-step austempering process has resulted in superior combination of all the mechanical properties. Therefore, ADI has many different applications in varying fields. One notable application of ADI is in transmission components for new energy vehicles. As the automotive continues to develop, ADI transmission components with higher damping properties are required, because the damping properties of ADI affect the vibration and noise of the transmission system. However, the mechanism behind the damping of ADI, as well as a full characterisation of the damping properties, has not been thoroughly investigated in the literature. Therefore, it is necessary to reveal the influencing factors and mechanism of the damping properties of ADI. In this paper, the effect of first-step austempering temperature on the microstructure, mechanical properties, and damping properties of ADI was investigated. The results revealed that the tensile strength, yield strength, and elongation of ADI all initially increased, until reaching a global maximum value (1320 MPa, 1230 MPa, and 13.2%, respectively) when the first-step austempering temperature was 280 °C, followed by a decrease in value. Interestingly, the impact energy of ADI initially decreased before reaching a global minimum and then increasing to a maximum value of 93.5 J, when the first-step austempering temperature reached 320 °C. With increasing strain amplitude, the internal friction values (Q−1) of ADI treated with different first-step austempering temperatures all increased gradually, and the Q−1 values of ADI with first-step austempering temperatures of 240 and 260 °C were higher than those of other samples. Moreover, the damping properties of ADI varied with frequency with obvious S-K peaks and Ge peaks.
Inheriting harmony
Authors: Calosi Claudio 
Published: August 2021

AbstractSupersubstantivalism, the view that material objects are identical to their locations, has recently been defended in metaphysics and philosophy of physics. One of the most powerful arguments in its favour is the so-called argument from harmony. There is a certain harmony between material objects and their locations. Necessarily, if material object x is located at a spherical region, x is spherical. Necessarily, if material object x is located at region r, any part of x is located at a part of r. Supersubstantivalism offers a straightforward explanation of such harmony. By contrast, dualism, the view that material objects are distinct from their locations, does not offer any explanation and should regard harmony principles as unexplained coincidences. In this paper I put forward a theory, which I shall call the ‘Inheritance Theory’, that does provide a straightforward explanation of harmony on behalf of dualists.
Commonalities and Asymmetries in the Neurobiological Infrastructure for Language Production and Comprehension
Authors: Giglio Laura , Ostarek Markus , Weber Kirsten , Hagoort Peter 
Published: August 2021

Abstract
The neurobiology of sentence production has been largely understudied compared to the neurobiology of sentence comprehension, due to difficulties with experimental control and motion-related artifacts in neuroimaging. We studied the neural response to constituents of increasing size and specifically focused on the similarities and differences in the production and comprehension of the same stimuli. Participants had to either produce or listen to stimuli in a gradient of constituent size based on a visual prompt. Larger constituent sizes engaged the left inferior frontal gyrus (LIFG) and middle temporal gyrus (LMTG) extending to inferior parietal areas in both production and comprehension, confirming that the neural resources for syntactic encoding and decoding are largely overlapping. An ROI analysis in LIFG and LMTG also showed that production elicited larger responses to constituent size than comprehension and that the LMTG was more engaged in comprehension than production, while the LIFG was more engaged in production than comprehension. Finally, increasing constituent size was characterized by later BOLD peaks in comprehension but earlier peaks in production. These results show that syntactic encoding and parsing engage overlapping areas, but there are asymmetries in the engagement of the language network due to the specific requirements of production and comprehension.
Enantiomeric Separation of Indole-3-Propanamide Derivatives by Using Supercritical Fluid Chromatography on a Polysaccharide-Based Chiral Stationary Phase
Authors: Suryakoppa Kaveesha Srinivasa , Kameshwar Vivek Hamse , Appadurai Ramesh , Eranna Siddalingamurthy , Khan M H Moinuddin 
Published: August 2021

AbstractThirteen pairs of I3P enantiomers were screened using nine polysaccharide chiral stationary phases and three different mobile phases. The purification strategy for 13 pairs of I3P enantiomers were designed and optimized considering enantiomeric purity and enrichment of isomers. Out of 13 I3P derivatives which were screened using supercritical fluid chromatography, 10 derivatives displayed excellent baseline separation using a Lux Cellulose—4 column and their resolution from higher to lower order of I3P-11, 13, 4, 12, 2, 1, 9, 3, 7 and 8 derivatives whereas in case of Lux Cellulose—2 column, the moderate separation was achieved as compared to Cellulose—4 in the order I3P-5, 6 and 10 derivatives. Excellent enantiomeric separations and retentions for all 13 I3P enantiomer derivatives were obtained in Cellulose—4 and Cellulose—2 columns in presences of methanol as organic modifier without any additives except in the case of I3P 12 enantiomer. The absolute stereochemical assignment of the purified isomers was determined through an optical rotation study. Among the series of I3P derivatives, I3P-5 showed potent antioxidant activity against catalase with an IC50 value of 13.78 μM. Further molecular docking, MM/GBSA and molecular dynamics studies revealed that the I3P-5 derivatives effectively bind to catalase with a docking score of −5.41 kcal/mol. Which validated chiral docking and indicated great potential for enantiomeric separation in drug discovery and present studies (R)—enantiomer preferentially depicts good binding capacity with catalase.
Severe Sepsis: The Fragile Anatomy of Crude Mortality
Authors: Vissichelli Nicole C , Sima Adam P , Wenzel Richard P 
Published: August 2021

Abstract
Clinical trials of severe sepsis that target crude mortality are underpowered to detect mortality differences due to intervention. We discuss the importance of including subcomponents of crude mortality in study design; how the proportion of attributable mortality affects sample size requirements; and how minor changes from predicted outcomes affect interpretation.
The Indian Chronic Kidney Disease (ICKD) study: baseline characteristics
Authors: Kumar Vivek , Yadav Ashok Kumar , Sethi Jasmine , Ghosh Arpita , Sahay Manisha , Prasad Narayan , Varughese Santosh , Parameswaran Sreejith , Gopalakrishnan Natarajan , Kaur Prabhjot , Modi Gopesh K , Kamboj Kajal , Kundu Monica , Sood Vivek , Inamdar Neeraj , Jaryal Ajay , Vikrant Sanjay , Nayak Saurabh , Singh Shivendra , Gang Sishir , Baid-Agrawal Seema , Jha Vivekanand 
Published: August 2021

ABSTRACT

Background
Chronic kidney disease (CKD) is an important cause of morbidity and mortality worldwide. There is a lack of information on epidemiology and progression of CKD in low–middle income countries. The Indian Chronic Kidney Disease (ICKD) study aims to identify factors that associate with CKD progression, and development of kidney failure and cardiovascular disease (CVD) in Indian patients with CKD.

Methods
ICKD study is prospective, multicentric cohort study enrolling patients with estimated glomerular filtration rate (eGFR) 15–60 mL/min/1.73 m2, or &gt;60 mL/min/1.73 m2 with proteinuria. Clinical details and biological samples are collected at annual visits. We analysed the baseline characteristics including socio-demographic details, risk factors, disease characteristics and laboratory measurements. In addition, we compared characteristics between urban and rural participants.

Results
A total of 4056 patients have been enrolled up to 31 March 2020. The mean ± SD age was 50.3 ± 11.8 years, 67.2% were males, two-thirds of patients lived in rural areas and the median eGFR was 40 mL/min/1.73 m2. About 87% were hypertensive, 37% had diabetes, 22% had CVD, 6.7% had past history of acute kidney injury and 23% reported prior use of alternative drugs. Diabetic kidney disease, chronic interstitial nephritis (CIN) and CKD-cause unknown (CKDu) were the leading causes. Rural participants had more occupational exposure and tobacco use but lower educational status and income. CIN and unknown categories were leading causes in rural participants.

Conclusions
The ICKD study is the only large cohort study of patients with mild-to-moderate CKD in a lower middle income country. Baseline characteristics of study population reveal differences as compared with other cohorts from high-income countries.