bluuebunny/crossref_metadata_2025 huggingface dataset:
Exploring Tourist Experience of Island Tourism Based on Text Mining: A Case Study of Jiangmen, China
Authors: Mo Rucong , Qi Huangxiong
Published: June 2023

Island tourism is an important part of the development of the marine economy. Understanding the tourist experience of island tourism is conducive to promoting the development of marine tourism. This study takes the main island tourism attractions in Jiangmen, China, as a case, and analyzes the tourist experience of island tourism through a text mining method based on the text reviews of tourists on Ctrip. The study shows that beach, hotel, attraction, seafood and seawater are the main discourse system core of tourists’ evaluation of island tourism. Tourists’ sentiment evaluation of island tourism is generally positive. Nice, convenient, clean, cheap and comfortable are the main sentiment characteristic words of tourists. The results of LDA topic model analysis show that tourists island tourism experience is mainly divided into four categories: coastal scenery, seafood cuisine, beach environment and entrance service.
Risk Assessment Method of Project Whole Process Based on Fuzzy Comprehensive Evaluation
Authors: Hu Shi , Zhang Yang , Lin Qingxin , Wan Zilong , Liu Yuluan
Published: June 2023

the whole process of risk assessment is a necessary part of the project preparation stage, which can avoid the risk factors and ensure the safety of the project. However, the existing assessment methods have the problem of weak control. Given this situation, a project whole process risk assessment method based on fuzzy comprehensive evaluation is proposed. Based on fuzzy comprehensive evaluation model, the risk weight is solved. The relevant influencing parameters are combined. The value range of the interdependence index is determined, and the calculation of risk factors is completed. Then, the standard evaluation data is fused by filtering high-risk data so as to deduce the core evaluation criteria. Complete the design of the whole process risk assessment method of the project based on a fuzzy comprehensive evaluation. The experimental results indicate that the fuzzy comprehensive evaluation model can greatly reduce the value of the key evaluation parameters, which can play a promoting role in avoiding risk factors and completing the accurate evaluation of the whole process of project risk.
Research on the investment Efficiency of Real Estate in Shanxi Province Based on DEA
Authors: Tian Fangyuan
Published: June 2023

The investment efficiency of real estate can, to some extent, reflect the development of a province's real estate industry. A good efficiency can also be conducive to economic growth and social stability. This paper uses DEA model to measure the real estate investment efficiency of 11 prefecture-level cities in Shanxi Province from 2017 to 2021, which helps to understand the current state of investment efficiency in Shanxi Province. The results found that the mean value of TE in Shanxi Province is 0.8136, the mean value of PTE is 0.9145, and the mean value of SE is 0.9369, indicating that Shanxi is inefficient and there is still room for improvement.
Research on International Competitiveness of Tylenol International Trade Co., Ltd Based on Big Data Event Analysis Model
Authors: Ying Zhou Mungia
Published: June 2023

In this era of rapid development of the global economy, competition among enterprises is becoming more and more fierce. Enterprise should compete with domestic and multinational enterprises. At present, the situation is grim for small and medium-sized enterprises. In the era of economic globalization, there are more and more opportunities for small and medium-sized enterprises to participate in international competition. As an essential pillar of China’s national economic development, whether small and mediumsized enterprises in China can gain a place on the international stage is related to promoting China’s comprehensive national strength. This paper selects Tylenol International Trade Co., Ltd. as the research object. This paper analyzes the export data of Tylenol International Trade Co., Ltd by using big data event analysis model. Event analysis model is one of the analysis models for user behavior, and it is also the core and foundation of user behavior data analysis. The user's behavior on the product is defined as an event, which is a professional description of the user's behavior. All the program feedback obtained by the user on the product can be abstracted as an event for collection.. in recent years to study its international competitiveness. It carries forward solutions to the existing problems to improve international competitiveness by optimizing the export product structure, developing the core products, establishing an effective international marketing mechanism, clarifying the positioning, and strengthening brand strategy to enhance international competitiveness.
Apply RF-LSTM to Predicting Future Share Price
Authors: Nan Haoxian
Published: June 2023

In recent years, share has become a more and more heated topic in the whole world. As one of the most significant items, the data is featured by great complexity, especially in price prediction. According to the previous relevant study, its prediction has high requirements for the model, which indicates using a single model cannot acquire relatively accurate prediction results. With regard to this problem, integrating random forest and long short-term memory is illustrated to solve that. The first step is the normalization of related share data, which is to reduce the influence caused by the discrepancy of different data. And then, random forest is used for choosing relatively optimal feature rally. In contrast to single decision tree, the application of random forest has simplified the complexity of training. After that, long short-term memory is used for forecasting the price and optimize plentiful important parameters in the model. According to test consequence, the error rate of the integrated model is decreased obviously.
Overseas Background of Executives and Corporate Innovation— Based on the Mediating Role of Financing Constraints and Internal Control
Authors: He Zhan
Published: June 2023

Firms can only adapt to new opportunities in the new era through continuous innovation, and talent is the engine that drives innovation activities. This paper selects data related to overseas executives and corporate innovation of A-share listed companies from 2005-2021 to empirically test the impact of executives' overseas background on corporate innovation. It is found that overseas executives significantly promote corporate innovation and act on corporate innovation mainly through two mediating effects of enhancing internal control and reducing financing constraints. The study further finds that the promotion of corporate innovation by executives' overseas backgrounds is more pronounced in non-state enterprises, and the promotion of corporate innovation is stronger among executives with overseas posting backgrounds and those with both overseas posting and study backgrounds. The findings of the study provide path suggestions for enterprises to implement innovation development, and also provide a theoretical basis for enterprises to select returnee talents.
Research on the Impact of El Nino Phenomenon on the Volatility of the U.S. Soybean Futures Price Yield
Authors: Guo Wei
Published: June 2023

Frequent occurrences of the EI-Nino phenomenon have made the influence of ENSO on the commodity market a hot research topic. To further investigate the connection between climate change and commodities markets and to offer a benchmark for future economic growth This study focuses on the impact of El Nio on the futures price yield of U.S. soybeans to give a new research direction for academics and investors. This research employs the GARCH-Mean model to estimate returns, then applies the event study approach and parametric tests to see whether there are significant differences in the futures price yield for U.S. soybeans. Test results indicate that EI Nino events have not had a substantial impact on the yield of U.S. soybean futures prices during the recent EI Nino phenomenon. This conclusion indicates that climate change may not be the primary factor influencing the future price of U.S. soybeans, and researchers must consider other factors. In addition, as a result of technological advancement, the government may predict that investors had already prepared for the volatility of the commodity market.
A Study on Residents' Satisfaction of "Healthy Houses" in Cities under the Background of Healthy China——Take Suzhou Industrial Park as an example
Authors: Gong Jinglan , Xu Sitian , Song Xinxi , Dai Yuyi , Zhao Juan , Shi Siyu , Wang Xinyan
Published: June 2023

This paper takes Suzhou Industrial Park as the research case, collects data through residents' questionnaires, and constructs a structural equation model to explore residents' satisfaction with "healthy house" and its influencing factors, in order to provide reference for better construction of "healthy house".The research draws the following conclusions: 1. Residents' overall satisfaction with the "health cabin" is 70.46%, which is relatively high; 2. The residents are highly satisfied with the blood pressure meter, temperature detector, opening time and frequency of the "Health House", but are less satisfied with the publicity work, lectures and propaganda activities of the "Health House"; 3. Policy factors have a positive impact on hardware environment satisfaction and hardware environment satisfaction; 4. Objective factors have a positive impact on software environment satisfaction and hardware environment satisfaction.
Research on the Impact of Environmental Regulation on the Financial Performance of Petrochemical Enterprises
Authors: Wu Mingtao , Dong Yipeng , Liu Zhengxin , yang Yong
Published: June 2023

China's government environmental protection-related departments attach great importance to the environmental pollution problems of petrochemical enterprises. The Environmental Protection Law as the core ecological regulation policy has been continuously improved to address the impact of macroenvironmental regulation on micro-individual petrochemical enterprises. The study subjects are 182 petrochemical companies from 2011-2021. The effect of different environmental regulations on the financial performance of petrochemical companies is studied empirically using a time-fixed effects model and a mediating effects model and using principal component analysis based on an agency cost perspective. The results show that environmental regulations significantly improve petrochemical firms' financial performance and suppress agency costs. Agency costs play a partial mediating role in the process of environmental regulations affecting financial performance.
Statisches vs. dynamisches Hand- und Fingerkrafttraining in der
Neurorehabilitation – eine randomisierte kontrollierte
Studie
Authors: Stähle M. , Eichmann B. , Nickels W. , Elsner B.
Published: June 2023

Problematik Durch akute und chronische neurologische Erkrankungen
entstehen 40% aller Behinderungen 1.
Die Anforderung an die Therapie in der Neurologie ist, die
größtmögliche Selbstständigkeit der Betroffenen
wiederherzustellen und ihre Lebensqualität zu verbessern 1. Studien haben gezeigt, dass ein gezieltes
Armtraining bei Menschen nach Schlaganfall die Griffkraft und Armfunktion
verbessern kann 4
5.

Methodik Es wurde eine randomisierte kontrollierte Studie mit 18 Probanden
durchgeführt. Die Probanden erhielten über einen Zeitraum von
maximal 4 Wochen 10–12 Therapieeinheiten mit statischem oder dynamischem
Handkrafttraining. Jede Therapieeinheit dauerte 30 Minuten.

Ergebnisse Die Hand- und Fingerkraft haben sich in der Kontrollgruppe
signifikant verbessert, der Unterschied zwischen beiden Gruppen ist nicht
signifikant. Der Box-and-Block-Test hat sich in der Interventions- und
Kontrollgruppe signifikant verbessert. Die Verbesserung des Box-and-Block-Tests
zwischen beiden Gruppen ist signifikant unterschiedlich. Die COPM hat sich in
Performanz und Zufriedenheit in beiden Gruppen signifikant verbessert ohne
signifikante Unterschiede zwischen den Gruppen.

Diskussion Dynamisches und statisches Hand- und Fingerkrafttraining
scheint positive Auswirkungen auf alle getesteten Parameter zu haben. Ob die
Verbesserungen statistisch relevant sind und ob eine bessere Wirksamkeit des
statischen Trainings vorliegt, sollte in weiteren Studien genauer
überprüft werden.
Training in der Therapie
Authors: Wilke Christiane , Leibfried Lukas P. , Abel Rebecca , Froböse Ingo
Published: June 2023

Das Verständnis von Gesundheit und Krankheit hat sich von einer
defizitorientierten zu einer ganzheitlichen Betrachtungsweise gewandelt. Auch
das Verständnis von Therapie entwickelte sich dadurch weiter, hin zu
einer patient*innenzentrierten Herangehensweise. Das bringt
nicht nur Chancen, sondern auch Herausforderungen mit sich. Damit aus
Herausforderungen Chancen werden, ist es hilfreich, entscheidende
Einflussfaktoren und die wichtigsten Stellschrauben für ein
erfolgreiches Training in der Therapie zu kennen.
Ultra-light axions and the S
8 tension: joint constraints from the cosmic microwave background and galaxy clustering
Authors: Rogers Keir K. , Hložek Renée , Laguë Alex , Ivanov Mikhail M. , Philcox Oliver H.E. , Cabass Giovanni , Akitsu Kazuyuki , Marsh David J.E.
Published: June 2023

We search for ultra-light axions as dark matter (DM) and dark energy particle candidates, for axion masses 10-32 eV ≤ m
a ≤ 10-24 eV, by a joint analysis of cosmic microwave background (CMB) and galaxy clustering data — and consider if axions can resolve the tension in inferred values of the matter clustering parameter S
8. We give legacy constraints from Planck 2018 CMB data, improving 2015 limits on the axion density Ωa
h
2 by up to a factor of three; CMB data from the Atacama Cosmology Telescope and the South Pole Telescope marginally weaken Planck bounds at m
a = 10-25 eV, owing to lower (and theoretically-consistent) gravitational lensing signals. We jointly infer, from Planck CMB and full-shape galaxy power spectrum and bispectrum data from the Baryon Oscillation Spectroscopic Survey (BOSS), that axions are, today, < 10% of the DM for m
a ≤ 10-26 eV and < 1% for 10-30 eV ≤ m
a ≤ 10-28 eV. BOSS data strengthen limits, in particular at higher m
a by probing high-wavenumber modes (k < 0.4h Mpc-1). BOSS alone finds a preference for axions at 2.7σ, for m
a = 10-26 eV, but Planck disfavours this result. Nonetheless, axions in a window 10-28 eV ≤ m
a ≤ 10-25 eV can improve consistency between CMB and galaxy clustering data, e.g., reducing the S
8 discrepancy from 2.7σ to 1.6σ, since these axions suppress structure growth at the 8h
-1 Mpc scales to which S
8 is sensitive. We expect improved constraints with upcoming high-resolution CMB and galaxy lensing and future galaxy clustering data, where we will further assess if axions can restore cosmic concordance.
Extraction method of nanoparticles concentration distribution from magnetic particle image and its application in thermal damage of magnetic hyperthermia
Authors: Tang 汤 Yundong 云东 , Chen 陈 Ming 鸣 , Flesch Rodolfo C.C. , Jin 金 Tao 涛
Published: June 2023

Magnetic particle imaging (MPI) technology can generate a real-time magnetic nanoparticle (MNP) distribution image for biological tissues, and its use can overcome the limitations imposed in magnetic hyperthermia treatments by the unpredictable MNP distribution after the intratumoral injection of nanofluid. However, the MNP concentration distribution is generally difficult to be extracted from MPI images. This study proposes an approach to extract the corresponding concentration value of each pixel from an MPI image by a least squares method (LSM), which is then translated as MNP concentration distribution by an interpolation function. The resulting MPI-based concentration distribution is used to evaluate the treatment effect and the results are compared with the ones of two baseline cases under the same dose: uniform distribution and MPI-based distribution considering diffusion. Additionally, the treatment effect for all these cases is affected by the blood perfusion rate, which is also investigated deeply in this study. The results demonstrate that the proposed method can be used to effectively reconstruct the concentration distribution from MPI images, and that the weighted LSM considering a quartic polynomial for interpolation provides the best results with respect to other cases considered. Furthermore, the results show that the uniformity of MNP distribution has a positive correlation with both therapeutic temperature distribution and thermal damage degree for the same dose and a critical power dissipation value in the MNPs. The MNPs uniformity inside biological tissue can be improved by the diffusion behavior after the nanofluid injection, which can ultimately reflect as an improvement of treatment effect. In addition, the blood perfusion rate considering local temperature can have a positive effect on the treatment compared to the case which considers a constant value during magnetic hyperthermia.
Analysis of Projectile Impact Resisting Characteristics of Hollow Triangular Matrix Structure
Authors: Wu Y X , Xu X Y , Zhang W F , Xu H
Published: June 2023

The numerical simulation of engineering structural elements and spatial combination form of the polarizing body using common engineering materials is carried out, and the triangular hole matrix space combination structure is proposed. The penetration depth and deflection angle of the projectile under different projectile velocities and incident positions are obtained by numerical simulation of the projectile impacting the composite structure under various working conditions. At the same time, through the comparative study of ordinary solid shell shielding structures, it is found that the higher the projectile velocity, the higher the shell shielding effectiveness of triangular hole matrix space composite structure.
Classification of Earthquake Damage of Buildings in Songyuan Area Based on Image Recognition
Authors: Chen Simin , Gao Tengda , Cheng Xuanhao , Jia Mingming
Published: June 2023

Since the emergence of human beings on the earth, various disasters have been accompanied. Among many natural disasters, the earthquake is undoubtedly one of the most threatening disasters. This project uses Res Net-50 model for deep learning and image recognition of building structural damage. Through the program to assess the local earthquake damage, given the feasible standards to facilitate a unified understanding of the earthquake situation, thereby improving the efficiency of disaster relief. Through experiments, the accuracy of the training set of the two classifications finally reached about 89.3 %, and the prediction accuracy of the test set finally reached about 71.4 %, Through the identification of post-earthquake building damage in Songyuan area, it can be learned that the accuracy of the software identification binary classification task is 73.21 %. Experiments show that taking photos can be used to predict the damage level of buildings in a certain area, and seismic damage identification can provide basis and support for post-disaster rescue and reconstruction and economic loss assessment.
Calculation and Analysis of Soil Deformation Induced by Lubrication Mud Pressure During Pipe Jacking Construction
Authors: Ye Jingliang , Chen Hao , Pan Zhichao , Yu Shoukuan
Published: June 2023

As a key step to decide the pipe jacking construction success or failure, the control of lubrication mud performance and parameters directly affects the magnitude of jacking force and deformation of surrounding soil. In order to establish soil deformation model induced by lubrication mud pressure during pipe jacking construction, based on the mechanism analysis of lubrication mud and surrounding soil, using equivalent model of cavity in the semi-infinite elastomer on internal pressure solves the deformation of soil under the effect of mud pressure, referencing image method and stress function method, which deduces the analytical formula of stress and deformation of surrounding soils caused by mud pressure. At the same time, the pattern of soil deformation is analyzed and obtained, the overlying soil vertical displacement increasing with pipes buried depth increasing and the horizontal displacement of soil on both sides pipes increasing with the depth increasing at first then decreasing.
Simplified Calculation Method of Middle Tower Effect of Multi-tower Suspension Bridge
Authors: Xu Xin , Zhang Yuan , Peng Chengming , Li Yonghui
Published: June 2023

In accordance with the “middle tower effect” design problem of multi-tower suspension bridges, the finite element method is currently used to find the reasonable range of the longitudinal stiffness of the middle tower through trial calculations. This method has disadvantages such as complex modeling and large calculation workload. Based on the principle of stiffness distribution, a simplified analysis method of the mid-tower effect of the multi-tower suspension bridge is proposed with the coordination of unbalanced force at the tower top and tower offset as the convergence target. By this method, the mid-span deflection-span ratio parameter and the anti-slip safety factor of the main cable at the saddle under the most unfavorable vehicle live load can be quickly obtained. Relying on the Oujiang River North Estuary Bridge project, the applicability of the method is verified, and the result has a slight deviation from the finite element solution, and the calculation accuracy meets the requirements. The influence of the longitudinal stiffness of the center tower and the friction coefficient between the main cable saddle slots on the middle tower effect of multi-tower suspension bridge is studied. (1) For an 800 m main span multi-tower suspension bridge, when the longitudinal stiffness of the middle tower is greater than 4 MN.m-1, the structure can basically satisfy the requirements of the vertical rigidity of the specification, and the deflection-span ratio is greater than 1/300; when the longitudinal rigidity of the middle tower is greater than 20 MN.m-1, the structure can meet the design requirements of the deflection-span ratio of 1/400. (2) When the longitudinal tower stiffness of the middle tower is 4 MN.m-1, the maximum tower deflection reaches 0.95 m; when the stiffness of the middle tower is greater than 80 MN.m-1, the maximum tower deflection of the middle tower is less than 0.3 m, but the unbalanced force at the top of the tower is greater than 27000 kN, which is unfavorable for the anti-skid requirements of the main cable at the top of the middle tower. (3) Increasing the friction coefficient of the cable saddle from 0.15 to 0.3 can effectively reduce the limiting effect of the middle tower effect on the value of the longitudinal stiffness of the bridge tower. Finally, through the response surface analysis method, based on the independent variable parameters such as the span of the main span, the number of lanes, the friction coefficient of the saddle groove, etc., the recommended formula for the longitudinal stiffness of the middle tower is given, which provides a quick solution method and check basis for the preliminary design of the middle tower of a multi-tower suspension bridge.
Key Techniques for Construction of East Anchorage of the Lingdingyang Bridge on Shenzhen-Zhongshan Link
Authors: Liao Wenlong , Li Mian
Published: June 2023

The Lingdingyang Bridge is a (580+1666+580m) two-tower three-span sea steel box girder suspension bridge. The east anchorage adopts a figure eight-shaped ground connecting wall foundation. The ground connecting wall has a diameter of 107.1m and a width of 65m. The wall thickness is 1.5m. the maximum depth of the wall is 63m, the embedded medium weathered granite depth is 5m. The overburden thickness is nearly 50m, the bedrock depth above 80Mpa is 10m, and the excavation depth of the foundation pit is 42m. The anchor body is a diamond shaped anisotropic anchor body, with a total volume of 93000 m3. The anchorage foundation adopts “locking steel pipe piles + I-shaped sheet piles + parallel wire ropes” combined island-building cofferdam, and the diameter of the island is 150m. There are 79 groove sections in the ground wall. Three-axis mixing piles are used to reinforce the joints and both sides of the groove wall before grooving. The technique of alternately forming grooves by “rotary drilling + groove milling machine” is adopted. The deep foundation pit is unearthed together with the excavation portal frame and the telescopic boom excavator, and the lining is constructed with the hanging form. After the excavation, the waterproof effect of the ground connecting wall is obvious, and the foundation pit is safe and reliable. The anchor body is constructed with a layer of 2m with a large amount of limestone powder concrete, and a 2m post pouring section is set at the same time. The maximum temperature is 65 °C, and the crack control effect is obvious.
Design, fabrication and experiment of dataset acquisition apparatus for dual imaging plane
Authors: Wu Xueyuan
Published: June 2023

Target tracking plays an important role in monitoring, security, pedestrian recognition and other fields. The imaging system of a single imaging plane is limited by hardware conditions, and sometimes is not competent for increasingly complex image processing tasks. Therefore, it is a natural choice to obtain better tracking effect by multi imaging plane cooperative system. When the target tracking network algorithm is implemented for the dual imaging plane system, the data set acquisition of image is indispensable. According to this requirement, we designed and fabricated an image data acquisition apparatus, which includes a set of optical system, two sets of imaging circuits and structural components. After the apparatus integration is completed, we acquire the image data and implement the target tracking experiment based on correlation filtering method. The experiment shows that the tracking accuracy and tracking success rate of correlation filtering algorithm are significantly improved compared with the method using single imaging plane information after using the dataset constructed by this apparatus.
Research On The Performance Test Method Of Elevator Brake
Authors: Ren Zhaolin
Published: June 2023

The elevator brake is an important part to ensure the safe operation of the elevator, and its performance directly determines the safety of the whole machine. This paper describes a brake performance test scheme and test principle, and makes reliability test through the test device for the elevator brake, recording the suction and release voltage, the response time, the brake surface temperature and the delay time of mechanical parts on both sides after a specific number of brake action. The analysis of the characteristics of brake performance changes with time is helpful to further understand the safety condition of elevator brake, and provides a reference for the related research of brake performance.
The Application of Microtremor Exploration Technology in Thick Loess Area of Lanzhou
Authors: Wang Xudong , Wang Lei
Published: June 2023

For the large thickness loess area in Lanzhou, engineering application research on excavated off-set loess using microtremor exploration technology. In this paper, by detecting the surface wave velocity structure of a single point, comparing the dispersion curve data of a single point with the borehole data, and comparing the surface wave velocity profile data with the engineering geological profile, the judgment basis of soil-rock interface and strong-medium interface is put forward. The stratigraphic structure of the loess area with large thickness is accurately divided; By analysing the relationship between the surface wave value of the borehole and the physical and mechanical indexes of the soil, the relationship curves of surface wave-porosity ratio, surface wave-density and surface wave-collapsibility coefficient are studied, and the fitting curves of each curve are obtained and the correlation is summarized. Through the research of this paper, it has certain guiding significance for the application of microtremor exploration in large thickness loess area.
Size effect on the compressive mechanical properties of pearl with “brick-mortar” structure
Authors: Qiu Tian , Liang Lihong
Published: June 2023

The size dependence of four different diameters of pearls with “brick-mortar” structure was studied by uniaxial compression experiments. The results show that the failure of pearls with different diameters under the compressive load is not complete brittleness, but has a certain toughness. The maximum failure load and compressive strength of pearls cannot be considered as constants, which have a significant size dependence. The maximum failure load increases with the increase of pearl diameter, and the compressive strength decreases with the increase of pearl diameter. In addition, the compressive strength of pearls with different diameters conforms to the Weibull statistical law. When the compression fracture probability is 50%, the compressive strength of pearls with different diameters shows a significant size effect, and pearls with smaller diameters have greater compressive strength.
Study on Fundamental Force of Extreme Wave on Complex Deepwater Jacket
Authors: Yi Jianjun , Zou Guoliang , Qin Pingshan
Published: June 2023

With the development of offshore wind power to the far-reaching sea, jacket foundation suitable for 10 ~ 60m water depth has become a development trend. The maximum waves in the far-reaching sea are generated by typhoons. The South China Sea spans the tropics and subtropics. Tropical cyclones therein are extremely active due to the features of its marine environment, like wide water-depth profile, complex topography and hydrology. Especially in recent years, under the development situation of global warming, extreme weather events have increased significantly, and strong and super typhoons have become more frequent. The extreme waves generated by them have a huge force on the jacket, affecting the safety of the project. In this paper, the relevant parameters of PMTC are calculated with the statistical method, the verified SWAN model is used to calculate the probable maximum typhoon wave, and the P-III frequency analysis on the extrapolated results of all typhoon waves are carried out by direction to obtain the design wave elements of each return period, and various extreme typhoon wave characteristic parameters were counted. Secondly, the Morison formula is used to calculate the wave force acting on the offshore fan jacket. This wave force based on different water depth and different directions is tested by physical model test. Finally, the results of model test and theoretical calculation are compared and analyzed to confirm that there is a certain correlation between the two wave forces. This empirical formula can be used to correct the calculated value of Morison formula in practical engineering design, which not only provides a simple and convenient calculation method for practical engineering design, but also provides a reference for the calculation model of the total force generalization of deep-sea complex structure foundation, which has certain theoretical value and practical significance.
Experimental Study on Flexural Behavior of the Composite Bottom Slab of the Stiffened Steel Truss
Authors: Zhang Jindan , Chen Junlin , Ye Xiaogang , Qiu Xiuli , Deng Lijiao , Su Ying
Published: June 2023

In order to study the influence of rib size on the flexural performance of the new reinforced truss concrete composite floor slab, two precast reinforced concrete floor slabs and one ordinary reinforced truss composite floor slab were designed and manufactured for flexural performance tests. The failure mode of the concrete slab under uniform load was analyzed, and the influence of rib size on the flexural capacity of the floor slab was studied. The results show that the stiffening of the steel truss composite slab can significantly improve the stiffness of the precast slab and effectively solve the problem of excessive deflection of the precast slab during construction. On the basis of the experimental study, the influence of the top chord steel bar diameter, concrete rib height and rib width on the short-term stiffness of the floor is deeply analyzed by using the finite element refined modeling. The results show that the diameter of the top chord reinforcement and the width of the concrete rib are positively related to the stiffness of the composite slab, and the height of the concrete rib has little effect on the initial stiffness of the precast slab, which mainly plays a role in the later stage.
Evaluation of Fatigue Properties of Mixed Asphalt Based on Linear Amplitude Scanning Test
Authors: Shen Shun , Liu Fuming , Su Heng , Peng Jiayuan
Published: June 2023

In order to study the effects of asphalt regenerators on the fatigue properties of mixed asphalt, linear amplitude scanning (LAS) test was designed and four types of regenerators (non-petroleum regenerators NRA and NRB, petroleum regenerators PR and bio-oil based regenerators BR) were mixed. The VECD theory analysis method was used to evaluate the miscible asphalt with different regeneration agents, different new asphalt and different old asphalt. The results showed that: In the process of asphalt regeneration, the peak value of the stress-strain curve will move to the lower right corner. The fatigue factor in the fatigue damage curve decreases slowly with the increase of the internal damage coefficient as the degree of asphalt aging increases. The stress sensitivity of SBS modified asphalt is lower than that of matrix asphalt, and the strain range of LAS test involving modified asphalt needs to be expanded. It can be seen that NRA is the best, BR is the second, NRA and PR are poor.
Influence of homogenization degree on microstructure and mechanical properties for a novel wrought superalloy
Authors: Li X X , Jia C L , Yu A
Published: June 2023

The present work aims at investigating the impact of homogenization time on microstructure and mechanical properties of a Ni-based superalloy GH4151 during hot deformation. The results showed that dense dendrite structure remained after homogenization at 1200°C for 5 h, which was similar to as-cast microstructure. Higher flow stress and cracking in 5 h-homogenized material is attributed to the integral deformation of microstructure with greater resistance and less recrystallization. Furthermore, the decrease in dense dendrite structure with increasing homogenization time helped to promote dynamic recrystallization (DRX) during deformation at 1200°C for 12h and 36 h due to increasing nucleation position. When the homogenization time increased to 60h, increase of grain size makes dislocation gather within grain and resistance increase.
Effect of cooling rates on thermoplasticity during hot deformation for a new wrought superalloy
Authors: Li X X , Jia C L , Yu A
Published: June 2023

The effect of cooling rate on thermoplasticity of ni base superalloy GH4151 during thermal deformation was studied. Several different treatments were used to obtain γ′ phases of different sizes and shapes. The hot tensile and hot compression tests were carried out, and the microstructure was studied in detail by scanning electron microscopy and transmission electron microscopy to determine the microscopic mechanism. The results show that the volume fraction of large γ’ phase increased with decreasing cooling rate. The slowly cooled material exhibits lower resistance to deformation due to more obvious softening behavior. The sample with slow cooling contains coarse γ′ phase and broaden γ-γ’ channel. The locations around broaden γ-γ’ channel were accumulated during deformation, which caused a high level of stored energy, and thus dynamic recrystallization (DRX) is promoted, and obvious softening behavior was displayed.
Experimental Study on Time - Varying Law of Resistivity of Concrete Sulphuric Acid Corrosion
Authors: Yu Yan , Lin Mingqiang , Dai Fengjuan
Published: June 2023

The change of concrete resistivity reflects the change of concrete porosity. The variation law of concrete resistivity within the age range of concrete is studied, and the effects of water binder ratio and fly ash content on concrete resistivity are studied. The change law of resistivity of concrete sulfuric acid corrosion was studied. The results show that the resistivity of concrete increases gradually with the increase of age. With the increase of water binder ratio and fly ash content, the resistivity increases with age. With the increase of sulfuric acid corrosion time, the concrete resistivity decreases gradually. With the decrease of sulfuric acid pH value, fly ash content and water binder ratio, the reduction range of concrete resistivity increases.
Mechanical Properties of Polymer Modified Concrete with Steel Fiber
Authors: Li Shuai , Liang Lihong , Li Huanyu
Published: June 2023

For the concrete used in highway, bridge and other structures, the problems such as the premature failure of the surface material and the failure of the interface between the surface course and the base course have not been solved, and the research at home and abroad mainly focuses on the strength and durability of concrete. It is also considered that polymer modified concrete and fiber reinforced concrete can improve the strength and toughness of concrete. This paper mainly studies the compressive and flexural properties of polymer modified fiber reinforced concrete. The experiment found that the mix design of styrene butadiene lotion modified steel fiber reinforced concrete proposed in this paper was reasonable, and the flexural strength at the age of 3 days reached 6.321Mpa, which was 16.9% higher than that of plain concrete; based on the plastic damage model (CDP) theory of concrete, the constitutive model of polymer modified fiber reinforced concrete is established, and the cubic concrete model is simulated under uniaxial compression, and the influence of concrete mortar with different strength substrates on the stress-strain field of uniaxial compression simulation is further analyzed.
Li2WO4 Composite Ba3Ti4Nb4O21 Microwave Dielectric Ceramics with Near-Zero Temperature Coefficient and Low-Temperature Sintering for 5G Communication Devices
Authors: Wu Xiaohui , Su Hua
Published: June 2023

In order to solve the problem of device miniaturization, it is urgent to develop high performance medium K materials. A series of (1-x) Ba3Ti4Nb4O21-x Li2WO4 ceramics (1-xBTN-xLW, x=12, 15, 17 and 20 mol%) were fabricated by soild-state reaction method. Li2WO4 as the effective sintering aids (~640°C) not only promoted ceramic densification and also decreased the temperature to 925°C. Among them, the 0.83BTN-0.17LW ceramic achieved best microwave performance with ε
r~21.85, Q×f~10534 GHz, τ
f
∼-7.78 ppm/°C. Especially, the second phase BaWO4 played major factor on microwave performance, making high K materials transfer into medium K materials and decrease the loss. More encouragingly, the temperature coefficient τ
f
was near zero. The above outstanding results signified that the 0.83BTN-0.17LW ceramic was expected to be a candidate material for LTCC miniaturized devices.
The Strength Behavior of O-Core Sandwich Pipe
Authors: An Tongtong , Redzuan Norizah , Jiang X.X. , Yuan Yongguang
Published: June 2023

Due to the characteristics of light weight, high specific strength, high specific stiffness and multi-function, sandwich structure is widely used in automotive industry, aerospace, offshore platform, construction, wind power generation and other fields. In recent years, the preparation and properties of new high-performance sandwich structures are the frontier research topics in the field of materials engineering. The research on the preparation method and mechanical properties of the sandwich pipes is favored by researchers at home and abroad. This paper, the O-core metal sandwich pipes is taken as the research object. The material is 304 stainless steel. By designing the orthogonal experiment, the sandwich pipes with 3 core pipes and 4 core pipes is prepared by laser welding. The tensile test of the sandwich pipes was carried out by Z250SNS electronic universal testing machine. At the same time, the finite element model of the sandwich pipes was established by using ANSYS finite element analysis software, and the strength of the sandwich pipes was further numerically simulated. Results show that the curves of the simulation and experiment data are in good agreement. Besides, when compare with an empty pipe, the carrying capacity of the sandwich pipe during stretching is significantly improved. The number of cores has a visible effect on the strength of the sandwich structure pipe, and the elastic limit is approximately proportional to the number of cores. In this paper, the mechanical properties of O-core metal sandwich pipe are studied, and the research method is clarified, which provides a new idea for the future research of sandwich pipe.
Spatial Damage Identification of 3D Structures based on Wavelet-Sparrow Search Algorithm
Authors: Kuang Jiaqi , Guan Deqing , Pan Xianwu
Published: June 2023

Based on the singularity principle of the wavelet transform, the continuous wavelet transform is applied to the strain mode of the damaged structure, and the data is normalised and coupled to each 3D position in space. The modal maxima of the wavelet coefficients of each layer of data are compared to identify the spatial location of the damage to the complex structure, and then the Sparrow Search Algorithm (SSA) is used to quickly and accurately identify the data and obtain the degree of damage to the structure. In this paper, the proposed method is validated by numerical finite element simulations and experiments on cantilever structures. The results of the study show that the method can be used to solve the 3D spatial damage identification problem in a simple and fast way, which can be used as a reference for structural inspection problems in practical engineering.
Estimation Rice Productivity Based on Vegetation Index Algorithm of Modis MOD13A1 Satellite (Case Study of Lengayang, Kabupaten Pesisir Selatan, SUMBAR-Indonesia)
Authors: Stiyanto E , Putra E G , Yanti D , Asmuti A , Mudrika R , Khairil W
Published: June 2023

Agriculture decision-making is increasingly being based on remote sensing technology. Crop productivity estimation was one application for satellite imagery technology. With each phenology of plant growth, the importance of satellite wave reflection and absorption produces a varied outcome. This study’s objective was to calculate rice productivity for Lengayang District in Pesisir Selatan Regency using satellite imagery. Pre-processing data, analyzing vegetation indexes until an extraction is made, and then creating a working map for field observation and validation are the processes that makeup data processing. The research was divided into numerous phases, beginning with the gathering of data, processing, observation, and data analysis. Cultivation season (CS) I began in February, CS II began in June, and CS III began in September, according to the examination of NDVI data in the Lengayang District over the course of some years. The equation 2916x4 − 8117x3 + 8180.2x2 − 3562.7x + 574.52 can be used to estimate productivity using the NDVI value technique in the Lengayang District. The results of the model reliability test were categorized as being quite satisfactory.
Determination of Shelf Life of Snakehead Fish Dispersion Products (Channa striata) Using the ASLT Method With Arrhenius Model
Authors: Rahmadani R , Bastian F , Tawali AB
Published: June 2023

Snakehead fish dispersion is one of the developments of food products that have fairly high nutritional benefits and serve as a dietary supplement to maintain endurance for adults, and help growth for children. Snakehead fish dispersion products consist of several materials that serve to improve product quality and extend shelf life. Estimation of shelf life in this study using the ASLT method of the Arrhenius model where the product is stored in three different temperatures, room temperature (28°C), temperature 35°C, and temperature 45°C. To calculate the shelf life, it is necessary to carry out several tests so that the main parameters that most influence damage to snakehead fish dispersion products can be determined. The parameters used are acidity, viscosity, and organoleptic levels including color, taste, and aroma. The results of this study point to the aroma as the main parameter because it has the smallest activation energy value compared to other parameters, namely -6672.96 cal/mol. The shelf life of snakehead fish dispersion products is calculated by the equation of reaction order 0 and obtained shelf life for a temperature of 28°C is 2.7 months, at a temperature of 35°C is 2.2 months, and storage at a temperature of 45°C is 1.5 months. The results of this study will be used as additional data in the development of snakehead fish dispersion products. And also become a reference in next research in determining the shelf life of products using the ASLT method with Arrhenius model.
Addition of cinnamon extract in making edible film of sago starch as packaging for lempok durian
Authors: Putri A S , Johan V S , Efendi R
Published: June 2023

The purpose of this study was to obtain the best concentration of cinnamon extract in making edible film of sago starch as lempok durian packaging. This research was conducted experimentally using a completely randomized design (CRD), four treatments, and four replications to obtain 16 experimental units. The treatments used were the concentration of cinnamon extract with P1 (without cinnamon extract), P2 (cinnamon extract 3%), P3 (cinnamon extract 5%), and P4 (cinnamon extract 7%). Observations were made on edible film moisture content and water vapor transmission rate. Observations made on lempok durian that had been coated with edible film with cinnamon extract were free fatty acids, descriptive aroma test, and texture. The data obtained were analyzed statistically with the Analysis Of Variance (ANOVA) test using IBM SPSS Statistics 24 software. If Fcount ≥ Ftable, then continued with Duncan’s New Multiple Range Test (DNMRT) at 5% level. The best treatment in this study was P4 (addition of 7% cinnamon extract) with the criteria of edible film water content 11.87%, water vapor transmission 7.54%. Criteria of lempok durian day 9 free fatty acids 1.55%, aroma descriptive test 1.90 (slightly rancid), and texture descriptive test 1.85 (slightly chewy). The advantage of this research is that the addition of cinnamon extract can extend the shelf life of lempok durian.
Characteristics and Antioxidant Activities of Instant Fish Ball Flour from Tuna Trimmings with Addition of Various Extracts from Natural Ingredients
Authors: Wellyalina  , Aisman  , Abdi  , Syukri Daimon
Published: June 2023

This study aims to determine the chemical characteristics and antioxidant activity of instant fish ball flour from tuna trimmings with the addition of various extracts of natural ingredients. This study used an exploratory method with 4 treatments, namely the addition of purple sweet potato extract, root tuber extract, carrot extract, butterfly pea extract and control. The results obtained were instant fish ball flour has protein content of about 19%, water content of about 8%, fat content of about 3%, ash content of about 1.5% and carbohydrate content of about 67-68% for all treatments. In addition, the fish ball flour obtained also had antioxidant activity of 8.47, 13.87, 25.27, 22.96, 17.64 ppm / 100 ppm for the control treatment, purple sweet potato, beetroot, carrot and butterfly pea, respectively. Overall the fish ball flour obtained has sufficient nutritional value and also functional value that can be used in the manufacture of fish balls.