Hui Zhang, Zhenwei Yang and Xingtao Zhang
In this paper, wool fibers are modified with titanate tetrabutyl by coating and grafting titanium dioxide (TiO2) nanoparticles under low temperature hydrothermal conditions. Field…
Abstract
In this paper, wool fibers are modified with titanate tetrabutyl by coating and grafting titanium dioxide (TiO2) nanoparticles under low temperature hydrothermal conditions. Field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis and diffuse reflectance spectroscopy are used as the characterization techniques. It is found that anatase TiO2 nanocrystals with crystal sizes smaller than 10 nm can be synthesized and simultaneously grafted onto fiber surfaces. In comparison with pristine wool fibers, the thermal stability for the TiO2-coated wool fibers is slightly changed. The ability to block ultraviolet radiation is improved. The volume density is slightly increased. The tensile properties are enhanced, while the crimp properties worsened. A photocatalytic degradation process of methylene blue dye and a decoloration rocess of chlorophyll are developed.
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Jinsong Zhang, Xinlong Wang, Chen Yang, Mingkang Sun and Zhenwei Huang
This study aims to investigate the noise-inducing characteristics during the start-up process of a mixed-flow pump and the impact of different start-up schemes on pump noise.
Abstract
Purpose
This study aims to investigate the noise-inducing characteristics during the start-up process of a mixed-flow pump and the impact of different start-up schemes on pump noise.
Design/methodology/approach
This study conducted numerical simulations on the mixed-flow pump under different start-up schemes and investigated the flow characteristics and noise distribution under these schemes.
Findings
The results reveal that the dipole noise is mainly caused by pressure fluctuations, while the quadrupole noise is mainly generated by the generation, development and breakdown of vortices. Additionally, the noise evolution characteristics during the start-up process of the mixed-flow pump can be divided into the initial stage, stable growth stage, impulse stage and stable operation stage.
Originality/value
The findings of this study can provide a theoretical basis for the selection of start-up schemes for mixed-flow pumps, reducing flow noise and improving the operational stability of mixed-flow pumps.
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Zhenwei Li, Zhixun Wen, Cheng Wang, Ying Dai and Peng Fei He
This paper aims to provide SIF calculation method for engineering application.
Abstract
Purpose
This paper aims to provide SIF calculation method for engineering application.
Design/methodology/approach
In this paper, the stress intensity factors (SIFs) calculation method is applied to the anisotropic Ni-based single crystal film cooling holes (FCHs) structure.
Findings
Based on contour integral, the anisotropic SIFs analysis finite element method (FEM) in Ni-based single crystal is proposed. The applicability and mesh independence of the method is assessed by comparing the calculated SIFs using mode of plate with an edge crack. Anisotropic SIFs can be calculated with excellent accuracy using the finite element contour integral approach. Then, the effect of crystal orientation and FCHs interference on the anisotropic SIFs is clarified. The SIFs of FCH edge crack in the [011] orientated Ni-based single crystal increases faster than the other two orientations. And the SIF of horizontal interference FCHs edge crack is also larger than that of the inclined interference one.
Originality/value
The SIFs of the FCH edge crack in the turbine air-cooled blade are innovatively computed using the sub-model method. Both the Mode I and II SIFs of FCHs edge crack in blade increase with crack growing.
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Jinsong Zhang, Wenqian Xi, Shuopeng Li, Hewei Liu and Zhenwei Huang
For underwater hydraulic machinery, the unique structure significantly enhances the three-dimensional non-uniformity of turbulence within the flow domain and high Reynolds number…
Abstract
Purpose
For underwater hydraulic machinery, the unique structure significantly enhances the three-dimensional non-uniformity of turbulence within the flow domain and high Reynolds number turbulence introduces complex effects on the machinery. Therefore, studying the turbulent flow characteristics in underwater hydraulic machinery is crucial for system stability.
Design/methodology/approach
This paper conducts a numerical analysis on a specific type of underwater hydraulic machinery. A numerical calculation model is established under stable inflow conditions to analyze the flow trends and pressure changes at different flow speeds. Subsequently, structural modifications are made to the underwater hydraulic machinery, and the characteristics of the velocity field, pressure field and vorticity distribution under different model parameters are analyzed.
Findings
The results indicate that changes in internal structure have a certain impact on flow characteristics. When the structural changes are significant, the fluid flow becomes more complex and pressure fluctuations become more intense. The research findings provide a scientific basis and theoretical guidance for the structural design of underwater hydraulic machinery and have significant research implications for controlling fluid-induced noise.
Originality/value
Affected by the inherent structural characteristics of the flow channel structure, the flow direction of the high-speed water flow changes drastically in the flow channel, so it is of great significance to study its flow characteristics for the stability of the system.
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Xing Ai, Shuaishuai Wang, Fenghua Luo, Haiqing Pei and Zhenwei Li
The purpose of this study is to describe the mechanism of single-crystal high-temperature creep deformation, predict the creep life more accurately and study the creep…
Abstract
Purpose
The purpose of this study is to describe the mechanism of single-crystal high-temperature creep deformation, predict the creep life more accurately and study the creep constitutive and lifetime models with microstructure evolution.
Design/methodology/approach
The mechanical properties of nickel-based single-crystal superalloy are closely related to the γ' phase. Creep tests under four different temperature and stress conditions were carried out. The relationship between creep temperature, stress and life is fitted by numerical method, and the creep activation energy is obtained. The creep fracture surface, morphology and evolution of strengthening phase (γ') and matrix phase (γ) during different creep periods were observed by scanning electron microscope. With the increase of creep temperature, the rafting time is advanced. The detailed morphology and evolution of dislocations were observed by transmission electron microscope (TEM).
Findings
With the increase of creep temperature, the rafting time is advanced. The detailed morphology and evolution of dislocations were observed by TEM. Dislocations are mainly concentrated in the γ channel phase, especially at high temperature and low stress.
Originality/value
A creep constitutive model based on the evolution of γ' phase size and γ channel width was proposed. Compared with the experimental results, the predicted creep life is within 1.4 times error dispersion band.
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This paper aims to comment upon the governance systems of state‐owned enterprises in Shanghai and to consider the adequacy or otherwise of those governance structures.
Abstract
Purpose
This paper aims to comment upon the governance systems of state‐owned enterprises in Shanghai and to consider the adequacy or otherwise of those governance structures.
Design/methodology/approach
The paper presents a study of existing governance arrangements and structures and considers areas for possible reform.
Findings
A sound corporate governance system is of great significance not only to the healthy development of enterprises but also for the enterprises to survive when they face the economic crisis. With the continuous spread of the world economic crisis, how to improve the corporate governance of state‐owned enterprises in Shanghai so that they can pass the financial crisis period safely has become one urgent and critical issue.
Originality/value
The study presents detail and reform areas for further reflection.
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Iwin Thanakumar Joseph S., Sasikala J. and Sujitha Juliet D.
The purpose of this paper is to study various ship detection methodologies. The accuracy of ship detection using satellite images still suffers from disturbances due to cluttered…
Abstract
Purpose
The purpose of this paper is to study various ship detection methodologies. The accuracy of ship detection using satellite images still suffers from disturbances due to cluttered scenes and varying ship sizes. The suitability of the techniques for various applications is explained in this survey.
Design/methodology/approach
A list of data on the subject was gathered and processed into tables. The test outcomes were then discussed to determine the most effective ship detection technique under various complex environments.
Findings
In this work, the advantages and disadvantages of different classification techniques of ship detection are highlighted. The suitability of the techniques for various applications is also explained in this survey. Several hybrid approaches can be developed in order to increase the accuracy of ship detection system. This survey also aids in highlighting the significant contributions of satellite images to effective ship detection system.
Originality/value
In this paper, studying various ship detection methodologies is given specific attention. A survey on ship detection and recognition is clarified with the detailed comparative analysis of various classifier techniques.
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Ou Bai, Xiaohua Yang, Keith O. Hunter and Bingwen Wang
This paper aims to first, identify the external and internal factors that a company needs to analyze when formulating its digital platform strategy. Based on the framework of…
Abstract
Learning outcomes
This paper aims to first, identify the external and internal factors that a company needs to analyze when formulating its digital platform strategy. Based on the framework of PESTNPG (political economic social and culture technological population and globalization) and internal analysis a company should analyze both internal and external factors to formulate its digital platform strategy. For companies from emerging markets the institutional-based market created by national or local governments is important for digital platform strategy. Second dynamic capability theory and its linkages to digital platform strategy. The dynamic capabilities view is considered as a primary theoretical lens in the strategy literature to analyze a company’s strategies to achieve sustainable competitive advantages. To carry out a successful digital platform strategy companies need to build strong dynamic capabilities to capture or create opportunities and reconfigure their resources simultaneously. Third the advantages and disadvantages of different digital platform strategies (i.e. an independent digital platform and online–offline integration platform) and the possible consequences and risks of different strategies. It is important to evaluate different types of digital platform strategies that require different capabilities in terms of business structure product structure revenue structure organizational structure and technology architecture. A company needs to link these capabilities to a digital platform strategy to enable the integration (or separation) of online business with offline business. It also increases the accuracy and efficiency of online business. Fourth key points of digital platform strategy implementation. Companies need to identify key profit models for their digital platform to promote business growth and financial returns. It is equally important to increase customer value by leveraging its digital exhibition platform and to learn to use digital technology to foster organizational dematerialization.
Case overview/Synopsis
Zhejiang Meorient Commerce & Exhibition Inc. (hereinafter referred to as “Meorient”) was a leading company in the exhibition industry in China. The unexpected outbreak of COVID-19 plunged Meorient into a state of emergency that forced it to fight for survival. Further, China had launched a national strategy of Digital China, which created new market opportunities for Meorient. As a result, Meorient gradually developed and launched its digital exhibition services in 2015. Meorient suffered significant losses in 2020 due to COVID-19 and had to formulate a new strategy based on a digital exhibition platform in 2021. Chairman Pan Jianjun had two options. One was a purely digital platform strategy without the original offline exhibition business. The other one was an online and offline integration strategy. Which option was the best way forward for Meorient? Pan had to make a choice. Some of the top management team members believed Meorient should completely transform into a digital platform company and provide comprehensive online digital exhibition services. Over the previous 20 years, Meorient had accumulated a large amount of data from domestic and foreign exhibitors and professional buyers and had gradually developed a digital exhibition platform. It was one of the companies that pioneered digital transformation within China’s exhibition industry. More conservative thinking held that Meorient's strategy should focus more narrowly on the integration of online and offline exhibition businesses. Toward the post-pandemic era, China’s national strategy of “Digital China” accelerated the development of digital infrastructures. During such critical transitional period, Meorient had to choose wisely if it was to sustain its profits or even survive.
Complexity academic level
The case is aimed at students in undergraduate, MBA, short course executive, EMBA or other executive education programs, especially where digital transformation is featured subject matter.
Supplementary materials
Teaching notes are available for educators only.
Subject code
CSS 11: Strategy
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Guoyang Wan, Fudong Li, Bingyou Liu, Shoujun Bai, Guofeng Wang and Kaisheng Xing
This paper aims to study six degrees-of-freedom (6DOF) pose measurement of reflective metal casts by machine vision, analyze the problems existing in the positioning of metal…
Abstract
Purpose
This paper aims to study six degrees-of-freedom (6DOF) pose measurement of reflective metal casts by machine vision, analyze the problems existing in the positioning of metal casts by stereo vision sensor in unstructured environment and put forward the visual positioning and grasping strategy that can be used in industrial robot cell.
Design/methodology/approach
A multikeypoints detection network Binocular Attention Hourglass Net is constructed, which can complete the two-dimensional positioning of the left and right cameras of the stereo vision system at the same time and provide reconstruction information for three-dimensional pose measurement. Generate adversarial networks is introduced to enhance the image of local feature area of object surface, and the three-dimensional pose measurement of object is completed by combining RANSAC ellipse fitting algorithm and triangulation method.
Findings
The proposed method realizes the high-precision 6DOF positioning and grasping of reflective metal casts by industrial robots; it has been applied in many fields and solves the problem of difficult visual measurement of reflective casts. The experimental results show that the system exhibits superior recognition performance, which meets the requirements of the grasping task.
Research limitations/implications
Because of the chosen research approach, the research results may lack generalizability. The proposed method is more suitable for objects with plane positioning features.
Originality/value
This paper realizes the 6DOF pose measurement of reflective casts by vision system, and solves the problem of positioning and grasping such objects by industrial robot.
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Thi-Thao-Nguyen Nguyen, Sy Tien Do, Viet Thanh Nguyen and Thu Anh Nguyen
This study aims to identify the enabling factors for Building Information Modeling (BIM) adoption in Vietnamese construction enterprises and uncover their interrelationships. This…
Abstract
Purpose
This study aims to identify the enabling factors for Building Information Modeling (BIM) adoption in Vietnamese construction enterprises and uncover their interrelationships. This will help stakeholders focus on controlling and allocating resources (time, personnel, and costs) appropriately to adopt BIM and differentiate themselves from fierce competition in the architectural, engineering, construction and operations (AECO) industry.
Design/methodology/approach
This study first identifies and evaluates 32 enabling factors for applying BIM in the Vietnamese construction industry according to the TOE extended framework. Afterwards, a hybrid questionnaire survey using a convenient sampling method is conducted to capture stakeholders' views. The exploratory factor analysis (EFA) and the partial least squares structural equation modelling (PLS-SEM) technique are then applied to identify the constructs of the enabling factors and their interrelationships.
Findings
The study extracts six constructs that could have a significant impact on the adoption of BIM in construction enterprises, namely: technical feasibility (TF), human resources and management (HRM), company business vision (CBV), political environment (PE), economic viability (EV), and legal aspects (LA). Based on eleven proposed hypotheses, the analysis results confirm nine hypotheses and show that the HRM, TF, and CBV have the strongest effects on managers in evaluating the factors for BIM.
Originality/value
The results of the study fill the gap in knowledge by discovering the interrelationships among the enabling factors for BIM adoption in construction enterprises. The results might support the construction enterprises and their stakeholders in increasing the application of BIM, and digital transformation in construction industry.