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Perspective: Acoustic Metamaterials in Future Engineering Perspective

Qiangbing Lu, Xin Li, Xiujuan Zhang, Minghui Lu, Yanfeng Chen

Engineering 2022, Volume 17, Issue 10, Pages 22-30 doi: 10.1016/j.eng.2022.04.020

Abstract: These interesting properties offer novel means for sound manipulation and thus have drawn a great dealdevelopments in AMMs with a focus on their future engineering, especially in the most promising fields of soundabsorption/isolation, acoustic imaging, cloaking, and so on, furthermore, we outline the opportunities

Keywords： Acoustic metamaterials Sound absorption/isolation Acoustic imaging Engineering application

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From dBA to soundscape indices: Managing our sound environment

Jian KANG

Frontiers of Engineering Management 2017, Volume 4, Issue 2, Pages 184-192 doi: 10.15302/J-FEM-2017026

Abstract: ., reduction of ‘sound level’, does not always deliver the required improvements in quality of life.The growing field of ‘soundscape studies’ is addressing this gap by considering the sound environmentsoundscape indices; and demonstrating the applicability of the soundscape indices in the management of our sound

Keywords： noise soundscape management sound environment soundscape index

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Innovative seismic retrofitting strategy of added stories isolation system

Min-Ho CHEY, J. Geoffrey CHASE, John B. MANDER, Athol J. CARR

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 1, Pages 13-23 doi: 10.1007/s11709-013-0195-9

Abstract: The seismic performance of “added stories isolation” (ASI) systems are investigated for 12-story momentThe isolation layer, as a core design strategy, is optimally designed based on optimal TMD design principleresults include the identification of differences in the number of added story by which the suggested isolation

Keywords： added stories seismic isolation tuned mass damper parametric optimization statistical method

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H_∞ control in the frequency domain for a semi-active floor isolation system

Yundong SHI, Tracy C BECKER, Masahiro KURATA, Masayoshi NAKASHIMA

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3, Pages 264-275 doi: 10.1007/s11709-013-0214-x

Abstract: A floor isolation system installed in a single floor or room in a fixed base structure is designed toWith this configuration, the input motions to the floor isolation from the ground motions are filteredThe floor isolation system should minimize the acceleration to protect equipment; however, displacementSemi-active control with an control was adopted for the floor isolation system and a new input shapingA series of shake table tests for a semi-active floor isolation system using rolling pendulum isolators

Keywords： semi-active floor isolation H_∞ control MR damper shaping filter shaking table

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Nanostructured gold films exhibiting almost complete absorption of light at visible wavelengths

Hanbin Zheng, Christine Picard, Serge Ravaine

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 2, Pages 247-251 doi: 10.1007/s11705-018-1710-2

Abstract: Nanostructured metal surfaces have been known to exhibit properties that deviate from that of the bulk material. By simply modifying the texture of a metal surface, various unique optical properties can be observed. In this paper, we present a simple two step electrochemical process combining electrodeposition and anodization to generate black gold surfaces. This process is simple, versatile and up-scalable for the production of large surfaces. The black gold films have remarkable optical behavior as they absorb more than 93% of incident light over the entire visible spectrum and also exhibit no specular reflectance. A careful analysis by scanning electron microscopy reveals that these unique optical properties are due to their randomly rough surface, as they consist in a forest of dendritic microstructures with a nanoscale roughness. This new type of black films can be fabricated to a large variety of substrates, turning them to super absorbers with potential applications in photovoltaic solar cells or highly sensitive detectors and so on.

Keywords： nanostructuration light absorption coating gold electrodeposition anodization

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Effect of light scattering on the performance of a direct absorption solar collector

Kwang Hyun WON, Bong Jae LEE

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 169-177 doi: 10.1007/s11708-018-0527-5

Abstract: The collector efficiency of a direct absorption solar collector (DASC) is very sensitive to optical propertiesof the working fluid, such as absorption and scattering coefficients.metal, however, the scattering cross-section of metallic nanoparticles could be comparable to their absorptionperformance if the scattering coefficient of nanofluid is carefully engineered depending on its value of the absorption

Keywords： direct absorption solar collector plasmonic nanofluid light scattering

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Performance analysis of solar absorption-subcooled compression hybrid refrigeration system in subtropical

Xiangyang YE,Liming LIU,Zeyu LI

Frontiers in Energy 2019, Volume 13, Issue 1, Pages 185-192 doi: 10.1007/s11708-017-0452-z

Abstract: Solar absorption-subcooled compression hybrid refrigeration system is a new type of efficient and economicalAs the condensation temperature ranges from 38°C to 50°C, the working time fraction of the absorptionThe average COP of the absorption subsystem is improved from 0.366 to 0.407.However, when the temperature of the absorption increases from 36°C to 48°C, the average COP of hybridMoreover, the working time fraction of the absorption subsystem decreases from 80% to 71.7%.

Keywords： solar absorption-subcooled compression hybrid dynamic simulation performance analysis

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Isolation and application of predatory

Ran Yu, Shiwen Zhang, Zhoukai Chen, Chuanyang Li

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0900-3

Abstract: Indigenous predatory BALO strains were successfully isolated from activated sludge. Sludge SRF and CST were significantly reduced by BALOs induced biolysis process. The increase of BALO input dosage promoted the sludge biolysis efficiency. Sludge biolysis disintegrated flocs and lysed cells for internal water release. The optimal sludge biolysis time was 24 h and no pH adjustment was needed. -and-like organisms (BALOs) are a group of ubiquitous and obligate predatory bacteria and commonly used as biocontrol agents. In this study, an efficient, environmental-friendly, and convenient BALOs encouraged municipal waste sludge biolysis pretreatment technique was developed and investigated for dewaterability enhancement of excess waste sludge. The indigenous predatory BALOs were successfully isolated from the sludge for biolysis treatment. Without any chemical addition or pH adjustment, the sludge specific resistance (SRF) and capillary suction time (CST) were significantly reduced by as high as 53.4% and 23.8%, respectively within 24 h’s treatment, which would further be lowered with the increase of BALOs input dosage. However, the continuous extension of reaction time would worsen the sludge dewaterability. The decreases of SRF and CST accompanied with the increases of sludge disintegration degree and soluble chemical oxygen demand, nitrogen, and phosphorus concentrations all emphasized the contributions of BALOs’ predation activities to sludge disturbance, cell lysis, and consequently the release of sludge intracellular water to finally effectively improve the sludge dewaterability and disposal efficiency.

Keywords： Bdellovibrio-and-like organisms (BALOs) Biolysis Activated sludge Dewaterability Predation

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Effect of fine solid particles on absorption rate of gaseous CO

LU Sumin, MA Youguang, SHEN Shuhua, ZHU Chunying

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 4, Pages 368-372 doi: 10.1007/s11705-008-0067-3

Abstract: The influence of the properties of solid particles in slurry on the absorption of CO in the slurry wasThe absorption experiments were carried out in three different slurries consisting of water, cyclohexaneThe experimental results show that the active carbon particles could enhance the absorption rate of gaseousHowever, it was observed that the active alumina and silica gel particles could enhance the absorptionThese phenomena indicate that the solid particles, which could enhance the gaseous CO absorption rate

Keywords： constant influence soybean solvent concentration

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Improving retrieval precision of NO

Jinpeng YANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 92-96 doi: 10.1007/s11465-009-0001-5

Abstract: The NO density error retrieved by the traditional method of differential optical absorption spectroscopy

Keywords： absorption structure low-frequency structure absorption cross-section NO₂ density

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From understanding to designing soundscapes

Jian KANG

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 4, Pages 403-417 doi: 10.1007/s11709-010-0091-5

Abstract: Soundscape represents a step change in the field of environmental acoustics in that it combines physical, social, and psychological approaches. Although the term soundscape was introduced in the 1960s, significant attention to it has mainly been paid in the last decade or so in the community of environmental acoustics by researchers and recently by practitioners including policy makers. This paper explores the current situation and future challenges in soundscape. Starting with a framework on research and practical needs in soundscape and a brief introduction of some recent/current networks, activities, projects, and publications, this paper then presents a systematic review of recent progress in soundscape research and practice. A short review of the soundscape research in China is also given.

Keywords： soundscape environment sound design urban landscape

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optimization of 1,3-dimethylimidazolylium dimethylphosphate-water binary mixture for a single effect absorption

Gorakshnath TAKALKAR, Ahmad K. SLEITI

Frontiers in Energy 2022, Volume 16, Issue 3, Pages 521-535 doi: 10.1007/s11708-021-0720-9

Abstract: The energy and exergy analyses of the absorption refrigeration system (ARS) using H O-[mmim][DMP] mixture

Keywords： ionic liquid driven absorption cycle H₂O-[mmim][DMP] coefficient of performance (COP) exergy

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A district heating system based on absorption heat exchange with CHP systems

Lin FU, Yan LI, Yi JIANG, Shigang ZHANG,

Frontiers in Energy 2010, Volume 4, Issue 1, Pages 77-83 doi: 10.1007/s11708-010-0022-0

Abstract: district heating systems with cogeneration, a district heating system is presented in this paper based on absorptionin the cogeneration system named Co-ah cycle, which means that the cogeneration system is based on absorption, the temperature of return water of primary heat network is reduced to about 25°C through the absorptionof the cogeneration plant, return water is heated orderly by the exhaust steam in the condenser, the absorption

Keywords： cogeneration district heating absorption heat exchange Co-ah cycle

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Novel polymorphic EST-based microsatellite marker isolation and characterization from

Manosh Kumar BISWAS,Peng CHEN,Mohamed Hamdy AMAR,Xiuxin DENG

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 1, Pages 60-65 doi: 10.15302/J-FASE-2015048

Abstract: Novel simple sequence repeat (SSR) markers were developed to evaluate their utility for genetic diversity and breeding studies of and related species. A total of 108 primer pairs were characterized by PCR amplification experiments. Among these, 61 were polymorphic and transferable to other citrus species. The number of alleles per locus ranged from 2 to 6, with an average of 2.37 alleles per locus. The expected heterozygosity and observed heterozygosity ranged from 0 to 0.83 and 0 to 1.00, respectively. These novel polymorphic SSR markers will be useful for citrus cultivar identification and evaluation as well as breeding studies.

Keywords： microsatellite polymorphism Poncirus trifoliata

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seismic response control on top of Three-Gorges ship lift towers using magnetorheological intelligent isolation

Weilian QU, Jianwei TU

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 1, Pages 32-41 doi: 10.1007/s11709-009-0003-8

Abstract: This paper proposes a roof magnetorheological (MR) intelligent isolation system to prevent the seismicthe fundamental semi-active control equation for the Three-Gorges ship lift where the MR intelligent isolationexperimental model of the ship lift was given, the vibrating table experiment of the MR intelligent isolationwhipping effect was carried out and the results of the inverse neural network control strategy and passive isolationIt was proven that the MR intelligent isolation system with proper control strategy can greatly reduce

Keywords： Three-Gorges ship lift tower whipping effect magnetorheological (MR) intelligent isolation system neural