Search | Engineering

Subscribe Submit

Home Journals Focus Achievement Fronts About Us 中文版

Resource Type

Journal Article 747

Conference Videos 39

Conference Information 1

Year

2024 2

2023 47

2022 69

2021 70

2020 44

2019 57

2018 52

2017 73

2016 60

2015 39

2014 21

2013 22

2012 22

2011 21

2010 24

2009 22

2008 18

2007 20

2006 17

2005 10

open ︾

Keywords

development strategy 21

2035 9

China 9

food security 6

renewable energy 6

sustainable development 6

Alzheimer’s disease 5

COVID-19 5

technology foresight 5

China Railway’s “Go Global” strategy 4

H₂S 4

concrete 4

energy revolution 4

finite element method 4

16S rRNA 3

energy transition 3

engineering science and technology 3

Saccharomyces cerevisiae 2

Additive manufacturing 2

open ︾

Search scope:

排序： Display mode:

Biosorption of Cd

Fengyu ZAN, Shouliang HUO, Beidou XI, Xiulan ZHAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1, Pages 51-58 doi: 10.1007/s11783-011-0206-9

Abstract: The biosorption of Cd and Cu onto the immobilized ( ) was investigated in this study. Adsorption kinetics, isotherms and the effect of pH were studied. The results indicated that the biosorption of Cd and Cu on the immobilized was fast at initial stage and then became slow. The maximum biosorption of heavy metal ions on immobilized were observed at pH 4 for Cd and Cu . by the pseudo-second-order model described the sorption kinetic data well according to the high correlation coefficient ( ) obtained. The biosorption isotherm was fitted well by the Langmuir model, indicating possible mono-layer biosorption of Cd and Cu on the immobilized . Moreover, the immobilized after the sorption of Cd and Cu could be regenerated and reused.

Keywords： Saccharomyces cerevisiae (S. cerevisiae) biosorption heavy metals immobilization

HTML PDF Collect

Exposure-response of Cr(III)-organic complexes to Saccharomyces cerevisiae

Nivedita CHATTERJEE, Zejiao LUO,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 2, Pages 196-202 doi: 10.1007/s11783-010-0008-5

Abstract: Hexavalent chromium [Cr(VI)] bioreduction produces soluble Cr(III)-organic complexes. The Cr(III)-organic complexes are relatively stable once they are formed, and no data about their toxicity were reported. Therefore, this study aims to investigate the bioavailability and toxicity of the soluble Cr(III)-organic complexes. L-1 wild type yeast strain was chosen as the model organism and Cr(III)-citrate was selected as the representative compound of the Cr(III)-organic complexes. The short-term chronic aquatic toxicity tests of the Cr(III)-citrate was explored by measuring growth inhibition, direct viable cell count, dry biomass, biosorption, and the amount of CO production. Cr(III)-citrate exerted a toxicity of 51mg/L with an , which was calculated from the percent growth inhibition. These toxicity data would be helpful to define the toxic potential of the organo-chromium-III compounds in the environment.

Keywords： Cr(III)-organic complexes Saccharomyces cerevisiae toxicity EC50 bioavailability

HTML PDF Collect

Assembly of biosynthetic pathways in

Lidan Ye,Xiaomei Lv,Hongwei Yu

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 1, Pages 126-132 doi: 10.1007/s11705-016-1597-8

Abstract: A robust and versatile tool for multigene pathway assembly is a key to the biosynthesis of high-value chemicals. Here we report the rapid construction of biosynthetic pathways in using a marker recyclable integrative toolbox (pUMRI) developed in our research group, which has features of ready-to-use, convenient marker recycling, arbitrary element replacement, shuttle plasmid, auxotrophic marker independence, GAL regulation, and decentralized assembly. Functional isoprenoid biosynthesis pathways containing 4–11 genes with lengths ranging from ~10 to ~22 kb were assembled using this toolbox within 1–5 rounds of reiterative recombination. In combination with GAL-regulated metabolic engineering, high production of isoprenoids (e.g., 16.3 mg?g dcw carotenoids) was achieved. These results demonstrate the wide range of application and the efficiency of the pUMRI toolbox in multigene pathway construction of .

Keywords： pathway assembly toolbox reiterative recombination S. cerevisiae biosynthesis

HTML PDF Collect

Engineering the Biosynthesis of Caffeic Acid in Saccharomyces cerevisiae with Heterologous Enzyme Combinations Article

Lanqing Liu, Hong Liu, Wei Zhang, Mingdong Yao, Bingzhi Li, Duo Liu, Yingjin Yuan

Engineering 2019, Volume 5, Issue 2, Pages 287-295 doi: 10.1016/j.eng.2018.11.029

Abstract: mdash;from several bacteria, we constructed functional 4-hydroxyphenylacetate 3-hydroxylase (4HPA3H) in Saccharomycescerevisiae to take on a role similar to that of the plant-derived cytochrome P450 enzyme and produce

Keywords： Saccharomyces cerevisiae Caffeic acid Heterologous enzyme Cytochrome P450 Synthetic biology

HTML PDF Collect

Comparative lipidomic analysis of

Bin QIAO, Hong-Chi TIAN, Ying-Jin YUAN

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4, Pages 461-469 doi: 10.1007/s11705-012-1223-3

Abstract: Variations in the composition and level of phospholipids (PLs) in yeast cells during industrial ethanol fermentation processes were analyzed. A comparative lipidomic method was used to investigate the changes in total cellular PLs during continuous and fed-batch/batch processes. The phospholipid metabolism in yeast changed during both processes, mainly due to the presence of long-chain poly unsaturated fatty acids (PUFA) that contained phosphatidyglycerol (PG), phosphatidylethanolamine (PE) and phosphatidylserine (PS). The complexity of the media affected the growth of the yeast and the membrane composition. Yeast incorporated lots of exogenous saturated and PUFAs from the feedstock during the fermentations. During the continuous fermentation, there was an increase in PLs with shorter chains as the fermentation progressed and early in process there were more long-chains. During the fed-batch/batch process, the PG species increased as the fermentation progressed. This is probably due to an inositol deficiency in the earlier part of the fermentation.

Keywords： lipidomics systems biology phospholipids stirred-tank saccharomyces cerevisiae biorefinery

HTML PDF Collect

Improving prodeoxyviolacein production via multiplex SCRaMbLE iterative cycles

Juan Wang, Bin Jia, Zexiong Xie, Yunxiang Li, Yingjin Yuan

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 4, Pages 806-814 doi: 10.1007/s11705-018-1739-2

Abstract:

The synthetic chromosome rearrangement and modification by loxP-mediated evolution (SCRaMbLE) system has been used to improve prodeoxyviolacein (PDV) production in haploid yeast containing chromosome synV. To rapidly and continuously generate genome diversification with the desired phenotype, the multiplex SCRaMbLE iterative cycle strategy has been developed for the screening of high PDV production strains. Whole-genome sequencing analysis reveals large duplications, deletions, and even the whole genome duplications. The deletion of YER151C is proved to be responsible for the increase. This study demonstrates that artificial DNA rearrangement can be used to accelerate microbial evolution and the production of biobased chemicals.

Keywords： synthetic biology genome rearrangement prodeoxyviolacein SCRaMbLE Saccharomyces cerevisiae

HTML PDF Collect

Engineering of

Ruizhao Wang,Xiaoli Gu,Mingdong Yao,Caihui Pan,Hong Liu,Wenhai Xiao,Ying Wang,Yingjin Yuan

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 1, Pages 89-99 doi: 10.1007/s11705-017-1628-0

Abstract: provides a reference to greatly enhance desired compounds accumulation by employing the key enzyme(s)

Keywords： synthetic biology astaxanthin β-carotene hydroxylase β-carotene ketolase Saccharomycescerevisiae

HTML PDF Collect

Exergy analysis and simulation of a 30MW cogeneration cycle

Nikhil Dev, Samsher, S. S. Kachhwaha, Rajesh Attri

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2, Pages 169-180 doi: 10.1007/s11465-013-0263-9

Abstract:

Cogeneration cycle is an efficient mean to recover the waste heat from the flue gases coming out of gas turbine. With the help of computer simulation, design parameters may be selected for the best performance of cogeneration cycle. In the present work a program is executed in software EES on the basis of mathematical modelling described in paper to study cogeneration cycle performance for different parameters. Results obtained are compared with the results available in literature and are found in good agreement with them. Real gas and water properties are inbuilt in the software. Results show that enthalpy of air entering the combustion chamber is higher than that of the flue gases at combustion chamber outlet. For different operative conditions, energy and exergy efficiencies follow similar trends; although, exergy efficiency values are always lower than the corresponding energy efficiency ones. From the results it is found that turbine outlet temperature (TIT) of 524°C is uniquely suited to efficient cogeneration cycle because it enables the transfer of heat from exhaust gas to the steam cycle to take place over a minimal temperature difference. This temperature range results in the maximum thermodynamic availability while operating with highest temperature and highest efficiency cogeneration cycle. Effect of cycle pressure ratio (CR), inlet air temperature (IAT) and water pressure at heat recovery steam generator (HRSG) inlet on the 30 MW cogeneration cycle is also studied.

Keywords： Cogeneration cycle air compressor HRSG gas turbine regenerator CR IAT

HTML PDF Collect

Optimization, Kinetics, and Equilibrium Studies on the Removal of Lead(II) from an Aqueous Solution Using Banana Pseudostem as an Adsorbent Article

Shridhar S. Bagali, Bychapur S. Gowrishankar, Aashis S. Roy

Engineering 2017, Volume 3, Issue 3, Pages 409-415 doi: 10.1016/J.ENG.2017.03.024

Abstract:

Natural adsorbents such as banana pseudostem can play a vital role in the removal of heavy metal elements from wastewater. Major water resources and chemical industries have been encountering difficulties in removing heavy metal elements using available conventional methods. This work demonstrates the potential to treat various effluents utilizing natural materials. A characterization of banana pseudostem powder was performed using environmental scanning electron microscopy (ESEM) and Fourier-transform infrared (FTIR) spectroscopy before and after the adsorption of lead(II). Experiments were carried out using a batch process for the removal of lead(II) from an aqueous solution. The effects of the adsorption kinetics were studied by altering various parameters such as initial pH, adsorbent dosage, initial lead ion concentration, and contact time. The results show that the point of zero charge (PZC) for the banana pseudostem powder was achieved at a pH of 5.5. The experimental data were analyzed using isotherm and kinetic models. The adsorption of lead(II) onto banana pseudostem powder was fitted using the Langmuir adsorption isotherm. The adsorption capacity was found to be 34.21 mg·g⁻¹, and the pseudo second-order kinetic model showed the best fit. The optimum conditions were found using response surface methodology. The maximum removal was found to be 89%.

Keywords： Banana pseudostem Lead Isotherm Adsorption Response surface methodology

HTML PDF Collect

Automated retrofit targeting of heat exchanger networks

Walmsley, Nathan S. Lal, Petar S. Varbanov, Jiří J. Klemeš

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 4, Pages 630-642 doi: 10.1007/s11705-018-1747-2

Abstract: refinery case study with 27 streams and 46 existing heat exchangers demonstrated the retrofit method’s

Keywords： process retrofit pinch analysis heat exchanger network heat recovery

HTML PDF Collect

Techno-economic evaluation of wind energy in southwest Nigeria

Muyiwa S. ADARAMOLA, Olarenwaju M. OYEWOLA, Olayinka S. OHUNAKIN, Rufus R. DINRIFO

Frontiers in Energy 2012, Volume 6, Issue 4, Pages 366-378 doi: 10.1007/s11708-012-0205-y

Abstract: In this study, an analysis of the wind energy potential in the southwest geo-political region of Nigeria was conducted. A 37-year (1971–2007) wind speed data set measured at 10 m height, obtained from eight meteorological stations within the region was analyzed using a 2-parameter Weibull function. Besides, a techno-economic evaluation of large wind energy conversion systems with power ratings ranging from 0.6 to 2 MW at different hub heights based on the levelized unit cost of electricity was made for the different sites considered. The result showed that electricity cost varied from 0.06997 and 0.11195 $/(kW·h) to 2.86611 and 4.58578 $/(kW·h) at limit values of turbine specific cost band intervals of 1000 and 1600 $/kW. It was further shown that Lagos, having the highest accumulated power outputs of 430.10 kW/a from DeWind D7 at 70 m hub height, is the most preferred for economically usable power generation in terms of the levelized unit cost.

Keywords： mean wind speed Weibull distributions wind turbine techno-economic analysis southwest geopolitical region Nigeria

HTML PDF Collect

Estimation of power in low velocity vertical axis wind turbine

Sampath S. S.,Sawan SHETTY,Chithirai Pon Selvan M.

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 2, Pages 211-218 doi: 10.1007/s11465-015-0338-x

Abstract:

The present work involves in the construction of a vertical axis wind turbine and the determination of power. Various different types of turbine blades are considered and the optimum blade is selected. Mechanical components of the entire setup are built to obtain maximum rotation per minute. The mechanical energy is converted into the electrical energy by coupling coaxially between the shaft and the generator. This setup produces sufficient power for consumption of household purposes which is economic and easily available.

Keywords： wind turbine shaft design power generation generator

HTML PDF Collect

Biofuels and food security

Dmitry S. STREBKOV

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 1, Pages 1-12 doi: 10.15302/J-FASE-2015052

Abstract: The major source of energy comes from fossil fuels. The current situation in the field of fuel and energy is becoming more problematic as world population continues to grow because of the limitation of fossil fuels reserve and its pressure on environment. This review aims to find economic, reliable, renewable and non-polluting energy sources to reduce high energy tariffs in Russian Federation. Biofuel is fuel derived directly from plants, or indirectly from agricultural, commercial, domestic, and/or industrial wastes. Other alternative energy sources including solar energy and electric power generation are also discussed. Over 100 Mt of biomass available for energy purposes is produced every year in Russian. One of the downsides of biomass energy is its potential threatens to food security and forage industries. An innovative approach proved that multicomponent fuel (80% diesel oil content for motor and 64% for in stove fuel) can remarkably reduce the costs. This paper proposed that the most promising energy model for future is based on direct solar energy conversion and transcontinental terawatt power transmission with the use of resonant wave-guide technology.

Keywords： fossil fuels biofuels food security electric power solar energy

HTML PDF Collect

Orderly decorated nanostructural photoelectrodes with uniform spherical TiO

Bakhshayesh,S. S. Azadfar

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 4, Pages 532-540 doi: 10.1007/s11705-015-1549-8

Abstract: This study presents a novel nanostructural electrode made of 20-nm-diameter nanoparticles, which orderly decorated with 2-µm TiO particles, deposited by a new gel process. The decorated electrode (DE) is better than the non-decorated electrode (NE) in both light scattering and light harvesting, as confirmed by diffuse reflectance spectroscopy. X-ray diffraction reveals that both electrodes have a mixture of anatase and rutile phases. The dye-sensitized solar cell based on the decorated electrode shows the highest power conversion efficiency of 7.80% as a result of less recombination demonstrated by electrochemical impedance spectroscopy. From internal power conversion efficiency measurement, the external quantum efficiency of DE cell at 530 nm is 89%, which is higher than that of NE cell (77%).

Keywords： dye-sensitized solar cell uniform particles TiO₂ gel process light harvesting

HTML PDF Collect

Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements

S. SAMANTA, S. S. NANTHAKUMAR, R. K. ANNABATTULA, X. ZHUANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3, Pages 542-556 doi: 10.1007/s11709-018-0496-0

Abstract: The aim of current work is to improve the existing inverse methodology of void-detection based on a target impedance curve, leading to quick-prediction of the parameters of single circular void. In this work, mode-shape dependent shifting phenomenon of peaks of impedance curve with change in void location has been analyzed. A number of initial guesses followed by an iterative optimization algorithm based on univariate method has been used to solve the problem. In each iteration starting from each initial guess, the difference between the computationally obtained impedance curve and the target impedance curve has been reduced. This methodology has been extended to detect single circular metallic inclusion in 2D piezoelectric cantilever beam. A good accuracy level was observed for detection of flaw radius and flaw-location along beam-length, but not the precise location along beam-width.

Keywords： piezoelectricity impedance curve mode shapes inverse problem flaw detection curve shifting