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H. sinensis mycelium inhibits epithelial-mesenchymal transition by inactivating

Li Lu, Haiyan Zhu, Hailin Wang, Huaping Liang, Yayi Hou, Huan Dou

Frontiers of Medicine 2021, Volume 15, Issue 2,   Pages 313-329 doi: 10.1007/s11684-020-0737-1

Abstract: Our previous studies established the antifibrotic action of mycelium (HSM) in the lung.

Keywords： epithelial−mesenchymal transition     H. sinensis mycelium     midkine     pulmonary fibrosis    

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Nonlinear dynamic analysis for elastic robotic arms

H. KORAYEM, H. N. RAHIMI

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 219-228 doi: 10.1007/s11465-011-0218-y

Abstract:

The aim of the paper is to analyze the nonlinear dynamics of robotic arms with elastic links and joints. The main contribution of the paper is the comparative assessment of assumed modes and finite element methods as more convenient approaches for computing the nonlinear dynamic of robotic systems. Numerical simulations comprising both methods are carried out and results are discussed. Hence, advantages and disadvantages of each method are illustrated. Then, adding the joint flexibility to the system is dealt with and the obtained model is demonstrated. Finally, a brief description of the optimal motion generation is presented and the simulation is carried out to investigate the role of robot dynamic modeling in the control of robots.

Keywords： robotic arms     elastic link     elastic joint     nonlinear dynamics     optimal control    

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Influence of short chain ceramides and lipophilic penetration enhancers on the nano-structure of stratum corneum model membranes studied using neutron diffraction

Annett SCHROETER, Tanja ENGELBRECHT, Reinhard H. H. NEUBERT

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 1,   Pages 29-36 doi: 10.1007/s11705-013-1302-0

Abstract: H NMR spectroscopy was used to study the impact of the ceramides’ degree of order within the stratumThe H NMR spectroscopic measurements showed that CER[NP] based ternary model system had a higher state

Keywords： of the stratum corneum     ceramide     penetration enhancer     model membrane     neutron diffraction     2H    

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A new technique for islanding operation of distribution network connected with mini hydro

LAGHARI,H. MOKHLIS,M. KARIMI,A. H. A. BAKAR,Hasmaini MOHAMAD

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 5,   Pages 418-427 doi: 10.1631/FITEE.1400309

Abstract: An islanding operation of a distribution network is a topic of interest due to the significant penetration of distributed generation (DG) in a power system network. However, controlling the frequency of an islanded distribution system remains an unresolved issue, especially when the load exceeds the generation. This paper presents a new technique for a successful islanding operation of a distribution network connected with multiple mini hydro based DGs. The proposed technique is based on three main parts. The first part uses an islanding detection technique to detect the islanding event correctly. The second part consists of a power imbalance estimation module (PIEM), which determines the power imbalance between the generation and load demand. The third part consists of a load shedding controller, which receives the power imbalance value and performs load shedding according to load priority. The proposed technique is validated on an 11 kV existing Malaysia distribution network. The simulation results show that the proposed technique is effective in performing a successful islanding operation by shedding a significant number of loads.

Keywords： Islanding operation     Mini hydro     Distributed generation (DG)     Islanding detection     Load shedding    

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Impact of wind power generating system integration on frequency stabilization in multi-area power system with fuzzy logic controller in deregulated environment

BHATESHVAR,H. D. MATHUR,H. SIGUERDIDJANE

Frontiers in Energy 2015, Volume 9, Issue 1,   Pages 7-21 doi: 10.1007/s11708-014-0338-2

Abstract: Among the available options for renewable energy integration in existing power system, wind power is being considered as one of the suited options for future electrical power generation. The major constraint of wind power generating system (WPGS) is that it does not provide inertial support because of power electronic converters between the grid and the WPGS to facilitate frequency stabilization. The proposed control strategy suggests a substantial contribution to system inertia in terms of short-term active power support in a two area restructured power system. The control scheme uses fuzzy logic based design and takes frequency deviation as input to provide quick active power support, which balances the drop in frequency and tie-line power during transient conditions. This paper presents a comprehensive study of the wind power impact with increasing wind power penetration on frequency stabilization in restructured power system scenario. Variation of load conditions are also analyzed in simulation studies for the same power system model with the proposed control scheme. Simulation results advocates the justification of control scheme over other schemes.

Keywords： two area power system     automatic generation control     wind power generating system (WPGS)     deregulated environment     fuzzy logic controller (FLC)    

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The psychology of organizational and social sustainability

Wei-Tau LEE, Hao ZHANG, Kenneth H. FUNK II

Frontiers of Engineering Management 2019, Volume 6, Issue 3,   Pages 336-350 doi: 10.1007/s42524-019-0029-0

Abstract: This paper presents 12 dimensions of work with the aim of providing further understanding of the relationship between work and the psychological well-being of workers. Previous research has indicated that these dimensions are significant in establishing such a relationship, which is essential to creating good work. These dimensions are also influential in their effect on the psychological state of workers and are translated specifically into actionable items in the workplace. A hypothetical system model is developed to relate these dimensions to one another, to workers, and to organizations. This set of dimensions also serves as a basis for further development of work design and evaluation tools.

Keywords： work design     work dimensions     psychological factors     good work    

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An investigation into the vibration of harmonic drive systems

Masoumi, H. Alimohammadi

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 409-419 doi: 10.1007/s11465-013-0275-5

Abstract:

Harmonic drive systems are precise and specific transmission gear systems which are beneficial in terms of the high transmission ratio and almost zero backlash. These inherent and spectacular properties result in using this mechanism in robotic and space sciences where the precision and lightwieght play an important role. This paper presents a vibration analysis of harmonic drive systems using the shell theory. Equations of vibration for the flexspline and the circular spline of the system are derived and used to find the natural frequencies for both parts and, moreover, vibration response of the system under the operating condition is calculated. Also, obtained vibration equations are utilized to study the effects of different involved parameters such as the geometry of the flexspline and its gear tooth, eccentricity, and unbalancing on the vibrational behavior of the system.

Keywords： harmonic drive system     strain wave gearing mechanism     vibration analysis     natural frequencies    

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Full-band error control and crack-free surface fabrication techniques for ultra-precision fly cutting of large-aperture KDP crystals

H. ZHANG, S. F. WANG, C. H. AN, J. WANG, Q. XU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 2,   Pages 193-202 doi: 10.1007/s11465-017-0448-8

Abstract:

Large-aperture potassium dihydrogen phosphate (KDP) crystals are widely used in the laser path of inertial confinement fusion (ICF) systems. The most common method of manufacturing half-meter KDP crystals is ultra-precision fly cutting. When processing KDP crystals by ultra-precision fly cutting, the dynamic characteristics of the fly cutting machine and fluctuations in the fly cutting environment are translated into surface errors at different spatial frequency bands. These machining errors should be suppressed effectively to guarantee that KDP crystals meet the full-band machining accuracy specified in the evaluation index. In this study, the anisotropic machinability of KDP crystals and the causes of typical surface errors in ultra-precision fly cutting of the material are investigated. The structures of the fly cutting machine and existing processing parameters are optimized to improve the machined surface quality. The findings are theoretically and practically important in the development of high-energy laser systems in China.

Keywords： ultra-precision fly cutting     large-aperture KDP crystals     spatial frequency     processing error    

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Catalytic activity of manganese oxide supported on alumina in the synthesis of quinoxalines

., H. Kathyayini, N. Nagaraju

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 4,   Pages 415-421 doi: 10.1007/s11705-013-1360-3

Abstract: The products are also analysed by LC-MS and H-NMR techniques.

Keywords： alumina     manganese oxide deposited on alumina     quinoxaline synthesis    

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Advancement in materials for energy-saving lighting devices

Tak H. KIM, Wentai WANG, Qin LI

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 1,   Pages 13-26 doi: 10.1007/s11705-011-1168-y

Abstract: This review provides a comprehensive account of energy efficient lighting devices, their working principles and the advancement of these materials as an underpinning to the development of technology. Particular attention has been given to solid state lighting devices and their applications since they have attracted the most interest and are the most promising. Solid state lighting devices including white light emitting diodes (LEDs), organic LEDs (OLEDs), quantum-dot LEDs (QLEDs) and carbon-dot LEDs (CLEDs) are promising energy efficient lighting sources for displays and general lighting. However there is no universal solution that will give better performance and efficiency for all types of applications. LEDs are replacing traditional lamps for both general lighting and display applications, whereas OLEDs are finding their own special applications in various areas. QLEDs and CLEDs have advantages such as high quantum yields, narrow emission spectra, tunable emission spectra and good stability over OLEDs, so applications for these devices are being extended to new types of lighting sources. There is a great deal of research on these materials and their processing technologies and the commercial viability of these technologies appears strong.

Keywords： energy-saving lighting devices     solid state lighting devices    

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Filtration ability of hollow fiber membrane for production of magnesium ammonium phosphate crystals by reaction crystallization

H. Watamura, H. Marukawa, I. Hirasawa

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 1,   Pages 55-59 doi: 10.1007/s11705-013-1312-y

Abstract: Relationship between magnesium ammonium phosphate (MAP) crystal properties and the filtration ability of hollow fiber membrane (HFM) were investigated. Phosphorus recovery process by crystallization has a problem that it produces a large amount of fine crystals. So improvement of the crystallization process by combining with filtration was discussed. MAP crystals were obtained by batch reaction crystallization and the filtration characteristics were investigated. The filtration was evaluated by the specific filtration resistance ( ) on HFM. Filtered slurry was prepared with each suspension density and crystal size distribution. The solution was filtered at constant pressure of 0.02 MPa and the filtration time on each filtrated volume was recorded. As a result, decreases exponentially with suspension density increasing from 0.25 g/L to 0.5 g/L and decreases moderately with suspension density increasing from 0.5 g/L to 1.5 g/L. of large crystals decreases exponentially at less suspension density than of small crystals does. Also, increases as the ratio of the fractured crystals increases.

Keywords： membrane separation     crystallization     MAP    

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Review of solvent based carbon-dioxide capture technologies

MUMFORD,Yue WU,Kathryn H. SMITH,Geoffrey W. STEVENS

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 125-141 doi: 10.1007/s11705-015-1514-6

Abstract: Currently, a large proportion of global fossil fuel emissions originate from large point sources such as power generation or industrial processes. This trend is expected to continue until the year 2030 and beyond. Carbon capture and storage (CCS), a straightforward and effective carbon reduction approach, will play a significant role in reducing emissions from these sources into the future if atmospheric carbon dioxide (CO ) emissions are to be stabilized and global warming limited below a threshold of 2 °C. This review provides an update on the status of large scale integrated CCS technologies using solvent absorption for CO capture and provides an insight into the development of new solvents, including advanced amine solvents, amino acid salts, carbonate systems, aqueous ammonia, immiscible liquids and ionic liquids. These proposed new solvents aim to reduce the overall cost CO capture by improving the CO absorption rate, CO capture capacity, thereby reducing equipment size and decreasing the energy required for solvent regeneration.

Keywords： large scale     carbon dioxide     carbon capture     solvent absorption    

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Managing obsolescence of embedded hardware and software in secure and trusted systems

COLLIER, James H. LAMBERT

Frontiers of Engineering Management 2020, Volume 7, Issue 2,   Pages 172-181 doi: 10.1007/s42524-019-0032-5

Abstract: Obsolescence of integrated systems which contain hardware and software is a problem that affects multiple industries and can occur for many reasons, including technological, economic, organizational, and social factors. It is especially acute in products and systems that have long life cycles, where a high rate of technological innovation of the subcomponents result in a mismatch in life cycles between the components and the systems. While several approaches for obsolescence forecasting exist, they often require data that may not be available. This paper describes an approach using non-probabilistic scenarios coupled with decision analysis to investigate how particular scenarios influence priority setting for products and systems. Scenarios are generated from a list of emergent and future conditions related to obsolescence. The key result is an identification of the most and least disruptive scenarios to the decision maker’s priorities. An example is presented related to the selection of technologies for energy islanding, which demonstrates the methodology using six obsolescence scenarios. The paper should be of broad interest to scholars and practitioners engaged with enterprise risk management and similar challenges of large-scale systems.

Keywords： enterprise risk management     diminishing manufacturing sources and material shortages     scenario-based preferences     systems engineering     deep uncertainty     product life cycle    

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Prospects of Huygens’ Metasurfaces for Antenna Applications

Ataloglou, Ayman H. Dorrah

Engineering 2022, Volume 11, Issue 4,   Pages 21-26 doi: 10.1016/j.eng.2021.05.011

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Preparation of manganese (III) acetylacetonate nanoparticles via an environmentally benign route

Shalaby, H. Abdallah

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 3,   Pages 329-337 doi: 10.1007/s11705-013-1339-0

Abstract: With the hope of overcoming the generation of hazardous materials to human health and environment, serious and great endeavor have been made in catalyst fabrication using green chemistry technology. In this paper, the manganese (III) acetylacetonate nanoparticles with diameters of about 146 nm were prepared by a simple and environmentally benign route based on hydrolysis of KMnO followed by reaction with acetylacetone in rapid stirring rate or ultrasonication. The as-prepared samples were characterized by X-ray diffraction, energy dispersive X-ray fluorescence (EDIX), Fourier transfer infrared spectroscopy and scanning electron microscope. Various parameters were investigated, and the pure and stable crystals of manganese (III) acetylacetonate could be obtained in 98% conversion at a molar ratio 7∶1 of acetylacetone to KMnO and 75°C after 60 min. We further proposed a mathematical model, and the predicted results from model were in good agreement with experimental results.

Keywords： green chemistry     manganese (III) acetylacetonate     reaction conversion     Mathematical model    

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Title Author Date Type Operation

H. sinensis mycelium inhibits epithelial-mesenchymal transition by inactivating

Li Lu, Haiyan Zhu, Hailin Wang, Huaping Liang, Yayi Hou, Huan Dou

Journal Article

Nonlinear dynamic analysis for elastic robotic arms

H. KORAYEM, H. N. RAHIMI

Journal Article

Influence of short chain ceramides and lipophilic penetration enhancers on the nano-structure of stratum corneum model membranes studied using neutron diffraction

Annett SCHROETER, Tanja ENGELBRECHT, Reinhard H. H. NEUBERT

Journal Article

A new technique for islanding operation of distribution network connected with mini hydro

LAGHARI,H. MOKHLIS,M. KARIMI,A. H. A. BAKAR,Hasmaini MOHAMAD

Journal Article

Impact of wind power generating system integration on frequency stabilization in multi-area power system with fuzzy logic controller in deregulated environment

BHATESHVAR,H. D. MATHUR,H. SIGUERDIDJANE

Journal Article

The psychology of organizational and social sustainability

Wei-Tau LEE, Hao ZHANG, Kenneth H. FUNK II

Journal Article

An investigation into the vibration of harmonic drive systems

Masoumi, H. Alimohammadi

Journal Article

Full-band error control and crack-free surface fabrication techniques for ultra-precision fly cutting of large-aperture KDP crystals

H. ZHANG, S. F. WANG, C. H. AN, J. WANG, Q. XU

Journal Article

Catalytic activity of manganese oxide supported on alumina in the synthesis of quinoxalines

., H. Kathyayini, N. Nagaraju

Journal Article

Advancement in materials for energy-saving lighting devices

Tak H. KIM, Wentai WANG, Qin LI

Journal Article

Filtration ability of hollow fiber membrane for production of magnesium ammonium phosphate crystals by reaction crystallization

H. Watamura, H. Marukawa, I. Hirasawa

Journal Article

Review of solvent based carbon-dioxide capture technologies

MUMFORD,Yue WU,Kathryn H. SMITH,Geoffrey W. STEVENS

Journal Article

Managing obsolescence of embedded hardware and software in secure and trusted systems

COLLIER, James H. LAMBERT

Journal Article

Prospects of Huygens’ Metasurfaces for Antenna Applications

Ataloglou, Ayman H. Dorrah

Journal Article

Preparation of manganese (III) acetylacetonate nanoparticles via an environmentally benign route

Shalaby, H. Abdallah

Journal Article