Discover insights from thousands of peer-reviewed papers on microbial electrochemical systems
Benjamin Korth, Thomas Maskow, Cristian Picioreanu et al.
Energy & Environmental Science · 2015
Microbes shoveling electrons heat up: combining calorimetry with microbial electrochemistry allows deciphering heat fluxes of electroactive microorganisms.
Federico Poli, Jacopo Seri, Carlo Santoro et al.
ChemElectroChem · 2020
Abstract Invited for this month's cover picture is the group of Dr. Francesca Soavi (Laboratory of Electrochemistry of Materials for Energetics, Department of Chemistry “Giacomo Ciamician”, University of Bologna). The cover picture shows a microbial fuel cell connected in parallel with a supercapacitor. Read the full text of the Article at 10.1002/celc.201901876 .
Long Zhang, Ray H. Baughman, Yongsheng Chen
ECS Meeting Abstracts · 2019
Low energy density of energy storage devices such as supercapacitors 1-5 and thermocells 6 has always been a problem to be solved urgently, which is due to the low specific surface area and low density of the electrode materials. The graphene based materials with high surface area have successfully increased the energy density of energy storage devices, but the density of graphene materials is still low, which leads to low energy density based on the weight of the whole devices. Currently most efforts have been focused on increasing the specific surface area of graphene materials, instead of increasing the density of graphene. Herein, we have successfully synthesized graphene based materials with both high specific surface area and density. Phenolic precursors were in-situ polymerized on the surface of graphene 3D network through the hydrothermal reaction. The mass ratio between the phenolic precursors and graphene oxide was varied from 1:4 to 1:100. The results indicated that when the mass ratio between the phenolic resin precursor and graphene oxide is 1:16, graphene based 3D cross-linked nano-composites with high density can be realized. The corresponding specific surface area is 700 m 2 /g and the density is 0.55 g/cm 3 ; Chemical activation by using activation agents to the as-prepared products was performed for the further increasing of the surface area. Different activation agents such as potassium hydroxide, sodium hydroxide and potassium carbonate were used, in which the chemical activation effect is the best for potassium hydroxide is the best. The optimal mass ratio between potassium hydroxide and Intermediate products ratio is 4:1, while the optimized activation temperature is 900 o C. The optimized graphene based materials have the specific surface area up to 3000 m 2 /g and the density about 0.5 g/cm 3 , which was used as the electrode materials for supercapacitors and thermocells 3,6 . Supercapacitors based on our materials exhibited a high energy density of 90 wh/kg in organic electrolyte, which is much higher than 54 wh/kg for supercapacitors based on the commercial activated carbon. Thermocells based on our materials achieved a output power of 12 W/m 2 , which is also much higher than 2 W/m 2 for thermocells based on the traditional carbon materials. This project provides a key material for energy storage devices to achieve high energy density and output power. Furthermore, it will strongly promote the research and development of supercapacitors and thermocells for their application in the area of small ignition device and harvesting the low-grade and wasted thermal energy. Reference: (1) Long Zhang ; Xi Yang; Fan Zhang; Guankui Long; Tengfei Zhang; Kai Leng; Yawei Zhang; Yi Huang; Yanfeng Ma; Mingtao Zhang; Yongsheng Chen*. Controlling the effective surface area and pore size distribution of sp(2) carbon materials and their impact on the capacitance performance of these materials. J Am Chem Soc 2013 , 135 , 5921-5929. (2) Fang Yang; Duo Tang; Tengfei Zhang; Wenzhi Qin; Yongsheng Chen; Liang Wang; Jun Wang; Haibin Zhang; Yi Li; Long Zhang* . A free-standing laser energy converter based on energetic graphene oxide for enhanced photothermic ignition. J Mater Chem A 2018 , 6 , 13761-13768. (3) Long Zhang ; Fan Zhang; Xi Yang; Guankui Long; Yingpeng Wu; Tengfei Zhang; Kai Leng; Yi Huang; Yanfeng Ma; Ao Yu; Yongsheng Chen*. Porous 3D graphene based bulk materials with exceptional high surface area and excellent conductivity for supercapacitors. Sci Rep 2013 , 3 , 1408. (4) Long Zhang ; Fan Zhang; Xi Yang; Kai Leng; Yi Huang; Yongsheng Chen*. High-performance supercapacitor electrode materials prepared from various pollens. Small 2013 , 9 , 1342-1347. (5) Long Zhang ; Jiajie Liang; Yi Huang; Yanfeng Ma; Yan Wang; Yongsheng Chen*. Size-controlled synthesis of graphene oxide sheets on a large scale using chemical exfoliation. Carbon 2009 , 47 , 3365-3368. (6) Long Zhang ; Taewoo Kim; Na Li; Tae June Kang; Jun Chen; Jennifer M. Pringle; Mei Zhang; Ali H. Kazim; Shaoli Fang; Carter Haines; Danah Al-Masri; Baratunde A. Cola; Joselito M. Razal; Jiangtao Di; Stephen Beirne; Douglas R. MacFarlane; Anuncia Gonzalez-Martin; Sibi Mathew; Yong Hyup Kim; Gordon Wallace; Ray H. Baughman*. High Power Density Electrochemical Thermocells for Inexpensively Harvesting Low-Grade Thermal Energy. Adv Mater 2017 , 1605652-n/a. Figure 1
Mario Vukotić, Damijan Miljavec
IET Electric Power Applications · 2015
This study presents a novel approach to the design process of a permanent‐magnet flux‐modulated machine by simultaneously focusing on the machine major advantage and disadvantage, that is, the high torque density and low power factor. The machine can be designed with a high power factor while retaining the high torque density. To do so, they both need to be described precisely. The torque equation is improved by considering the stator‐winding leakage flux. It determines the relation between the geometric parameters and the torque more accurately. The power‐factor equation is derived from the electric equivalent circuit representing the simplest description of the machine. The machine geometry optimised with the design of experiments via Taguchi methods assures the best possible performance within the set limitations. It is shown that using the proposed design process makes the permanent‐magnet flux‐modulated machine more appropriate than the classical synchronous machine for the direct drive applications requiring a high torque density, low weight and high efficiency.
Agus Sunandar, Dharsono Dharsono
ARTISTIC : International Journal of Creation and Innovation · 2020
Malang Flower Carnaval (MFC) which has worldwide, the results of the creation of these activities have been staged in various countries in the world. MFC has successfully entered the COE (Calender of Event) of the Indonesian Ministry of Tourism 3 times. The existence of this event supports and strengthens the predicate of Malang City as a Creative City in Indonesia. This success is interesting to do a study of how the fashion creativity that has been created from the MFC. This study uses a qualitative approach specifically Roland Barthes's fashion function theory and Edmund Burke Feldman's function theory of art. The results of the study showed that the creativity of the carnival dress appeared in the visualization of the shape of hair such as temples, gold ornaments, ornamental elements, and body gestures that symbolized the beauty of local dance. In addition, the carnival costumes can be a representation of local culture as an idea of creation. Implementation of a fashion carnival can encourage community creativity which ultimately increases public welfare.
Muhammad Iskandar, Sonson Nurusholih
Balong International Journal of Design · 2019
Character figures are vital elements in a narrative story, especially with the presence of the characters in the story. Without the presence of characters with strong characterizations, a story in a comic will not be interesting to be read. This research will focus on how to design a comic character using the morphological forced connection transformation method. The final result of the research is a form of comic characters with a combined form of humans and animals where the process of making these characters can be a foothold for illustrators who want to make a character of a kind. This research method uses a qualitative descriptive method, with data collection methods carried out through a variety of literature studies, as well as tracing documentation data. The Matrix Manga Theory from Hiroyoshi Tsukamoto was used to give personality figures, the fundamental theory of Human Drawing from Andrew Loomis as a foothold to make anatomy. The final results of the study will be (1) New characters combined figures of humans and animals (2) drawing method to create characters using the morphological forced connection method.
David J. Nagel, Alex E. Moser
Journal of Condensed Matter Nuclear Science · 2016
The rapid release of energy from Lattice Enabled (or Low Energy) Nuclear Reactions is of interest for three reasons. First, it constrains and challenges theories about the mechanism(s) active in producing LENR. Next, it might heavily influence the design of heat and electrical generators based on LENR, since they have to be safe for use by a wide variety of people. Finally, there has long been interest in whether or not LENR could be used to augment existing weapons or produce to entirely new weapons. This paper first reviews reports in the literature of meltdowns or explosions that might have been caused by LENR. Then, each of the three areas cited above is examined. It is clear that reported high energy or high power events will heavily impact theories about LENR and the development of safe products. It is unclear now if LENR will be weaponized in any form. Control of the initiation of explosive LENR events is obviously necessary for that possibility.
Ponnusamy Senthil Kumar, G. Janet Joshiba
Diffusion Foundations · 2019
The discovery of carbon nanotubes is one of the remarkable achievement in the field of material science and it is a great advancement of Nanotechnology. A carbon nanotube is an expedient material used in several domains and paves way for the welfare of humans in many ways. Carbon nanotubes are nanosized tubes made from graphitic carbons and it is well known for its exclusive physical and chemical properties. The market demand for the nanotubes has increased progressively due to its size dependent, structure and mechanical properties. The carbon nanotubes possess high tensile strength and it is also found to be the durable fibre ever known. It is also found to possess exceptional electrical properties. The carbon nanotube composites have an excellent young’s modulus and higher tensile strength same as graphite carbon. This review plots the properties of carbon nanotubes and portrays the planning and properties of carbon nanotube composites. The wide application of carbon nanotube composites is also explained.
Ali Hasani
Nanoscience & Nanotechnology-Asia · 2020
By far the most important members of carbon-based materials family, are graphene, Carbon Nanotube (CNT) and Carbon Nanohorn (CNH). Thanks to their outstanding features and effective applications, have been broadly researched in recent times. Numerous ways have been proposed to synthesize graphene, CNT and CNH. This paper presents an overview of approaches to graphene, CNT and CNH synthesis, properties and applications. Most of the ways to create graphene is related to Hummer's method. Thanks to the exclusive electrical and thermal properties of graphene, it has been applied to build batteries, gas and vapor sensors, and elimination of numerous pollutants from water. Also, this review involves the conventional definition of the carbon nanotubes growth mechanism. Undoubtedly, an expert interpretation of nanotube growth at the atomic scale is one of the major challenges to improve nanotubes bulk synthesis procedure. In fact, a controlled growth may lead to get the ideal form of nanotube. Moreover, carbon nanohorn is a new member of single-graphene tubules family with a diameter of 3-6 nm and a length 35-45 nm. According to the latest reports, a new fluid including carbon nanohorns and ethylene glycol can be used for solar energy applications. Carbon nanohorns have an important role in increasing sunlight absorption as for the pure base fluid. Nanohorn spectral characteristics are far more interesting than those of amorphous carbon for the exclusive application. They can be used in important industries such as gas sensors, drug delivery, detecting some food borne contaminants.
Amir Navidfar, Taher Azdast, Ayub Karimzad Ghavidel
Journal of Applied Polymer Science · 2016
ABSTRACT In this work, multi‐walled carbon nanotubes (MWCNT) and poly(methyl methacrylate) (PMMA) pellets were compounded via corotating twin‐screw extruder. The produced MWCNT/PMMA nanocomposite pellets were injection molded. The effect of MWCNT concentration, injection melt temperature and holding pressure on mechanical properties of the nanocomposites were investigated. To examine the mechanical properties of the MWCNT/PMMA nanocomposites, tensile test, charpy impact test, and Rockwell hardness are considered as the outputs. Design of experiments (DoE) is done by full factorial method. The morphology of the nanocomposites was performed using scanning electron microscopy (SEM). The results revealed when MWCNT concentration are increased from 0 to 1.5 wt %, tensile strength and elongation at break were reduced about 30 and 40%, respectively, but a slight increase in hardness was observed. In addition, highest impact strength belongs to the nanocomposite with 1 wt % MWCNT. This study also shows that processing condition significantly influence on mechanical behavior of the injection molded nanocomposite. In maximum holding pressure (100 bar), the nanocomposites show highest tensile strength, elongation, impact strength and hardness. According to findings, melt temperature has a trifle effect on elongation, but it has a remarkable influence on tensile strength. In the case of impact strength, higher melt temperature is favorable. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43738.
Kyle Rego, Vincent Meunier
AIP Advances · 2019
The structural and mechanical properties of carbon nanotube knots are investigated using molecular dynamics simulations. Using parametric representations of mathematical (harmonic) knots, a method is provided for calculating the initial atomic coordinates of carbon nanotubes in the shape of arbitrary knots for use in molecular dynamics simulations. A computational stress-strain testing scheme is implemented and applied to (5, 5) knotted carbon nanotubes to determine their tensile strength, plastic limit, and relative knot strength. Stress-strain curves are given for (5, 5) carbon nanotube stopper knots. It is determined that a carbon nanotube’s tensile strength is reduced to at most 1/3 of its original strength when tied into a knot. It is also shown that it is possible to form tight and stable carbon nanotube knots by subjecting the knots to stress beyond the plastic limit. In contrast, loose knots stabilized by noncovalent interactions are not dynamically stable and spontaneously untie. To help understand the stability of loose carbon nanotube knots, the relationship between bending strain energy and curvature is studied using carbon tori. Our study demonstrates the possibility to tie carbon nanotubes into various stable knots and provides a general framework for the study of other macromolecular knots relevant to potentially useful nanotechnology.
Muhammad Mansoor, Shaheed Khan, Amjad Ali et al.
Journal of Composite Materials · 2019
Demand of special combination of different properties of the materials instigated the development of metal matrix composite. The carbon nanotubes being renowned for their excellent physical and mechanical properties are one of the major choices as strengthen material for metal matrix composites. To benefit their properties, the carbon nanotubes should be thoroughly dispersed and have wetting with the matrix. In the present study, a precursor of aluminum-carbon nanotubes was prepared by coating the nanotubes with titanium and used to fabricate the composite by induction melting. The precursor provided easy wetting, while induction melting facilitated dispersion of the nanotubes readily. Consequently, the composite exhibited noticeable augmentations in yield and tensile strength from 64 to 193 MPa and 81 to 227 MPa, respectively.
Jie Chen, Wen Wang, Sheng Zhang
AIP Advances · 2020
Carbon nanotube (CNT) films showing excellent mechanical and frictional performances are one of the most competitive candidates for fabricating functional surfaces; in particular, the bulk form of the forest-like vertical aligned CNT (VACNT) film and CNT sponge are idea candidates for making a flexible solid lubricant surface due to the fact that their porous network has a high potential to experience large deformation. In this article, the frictional behavior of the VACNT and CNT sponge against a millimeter scale copper sphere has been studied under various conditions within a home-built system. Due to the intrinsic mechanical instability of VACNTs, a higher friction state than the CNT sponge has been observed, and beyond that, VACNTs typically show a run-in process as a function of sliding circle caused by the formation and rearrangement of quasi-periodic cracks; on the contrary, the friction of the CNT sponge is very stable. In addition, we have pinpointed the effects of sliding velocity, relative humidity, and temperature on friction. The sliding friction was observed to be independent of the velocity and temperature; however, due to the increase in capillary force, friction increases with the increase in relative humidity.
Seisuke Ata, Chandramouli Subramaniam, Ayumi Nishizawa et al.
Advanced Engineering Materials · 2016
Thermal management of personal computer and other devices are critical issue for stable operation. Especially, soft and high thermal conductive materials are widely required for thermal transfer from heat source to heat sink. In this study, we prepared high thermal conductive composite with long single wall carbon nanotube, pitch‐derived carbon fiber and fluorinated rubber. Thermal conductivity of the composites is up to 80 W mK −1 which is higher than that of iron or brass. Furthermore, origin of the high thermal conductivity of the composites is investigated by using Weidman–Franz low. Carbon nanotubes enhance phonon thermal transfer between carbon fiber to carbon fiber.
Andrew John Ferguson, Jeffrey L. Blackburn
ECS Meeting Abstracts · 2019
While the unique chemical and physical structure of semiconducting single-walled carbon nanotubes (s-SWCNTs) were identified decades ago, marking these nanoscale materials as promising candidates for constituents in a variety of optical and electronic applications, the ability to generate high-purity samples has hampered efforts to validate these expectations. The intervening years have played witness to a number of elegant enrichment strategies aimed at extracting tailored semiconducting SWCNT species from the raw soot, from the use of subtly tunable surfactant interactions to the exploitation of specific DNA sequences. In contrast, we employ an enrichment approach based on conjugated polymers, typically derived from the fluorene moiety, since they show great promise with regards to their high selectivity and viability for scalable manufacturing approaches. As alluded to above, these fluorene-based (co-)polymers confer solubility on the s-SWCNT species, allowing for the preparation of highly enriched s-SWCNT dispersions that can be deposited using a variety of solution-processing approaches. Unfortunately, the strong van de Waals forces between the π-electron systems of the polymer and SWCNT that enable the selective extraction of semiconducting SWCNTs with high purity also make removal of the polymer difficult. Since these polymers typically have a wide bandgap they can act as an insulating coating on the surface of the individual SWCNTs within functional networks, inhibiting the transport of energy in the form of excitons and/or charge carriers. Here we demonstrate approaches that allow us to replace the strongly-bound polymers with derivatives that can be removed using simple solution-based chemical strategies, resulting in networks with modified energy transport properties. We show that removal of the polymer results in a significant enhancement of the charge carrier mobility and electrical conductivity in doped s-SWCNT networks. Finally, we extend the approach to samples strongly enriched in a single chiral s-SWCNT species, which allows us to employ transient spectroscopic techniques to probe exciton transport within the s-SWCNT network with high spectral fidelity. We show that the efficiency of exciton transport is subtly dependent on the complex interplay between polymer removal and carbon nanotube bundling. Our studies highlight a methodology by which high-performance s-SWCNT thin films can be prepared and discuss the implications of our findings on the potential to realize their promise for electronic and optoelectronic applications.
Unknown Author
East European Journal of Physics · 2019
Low power consumption, small device size and better controlled onto the charge carriers are the factors, that made Single-electron transistor (SET) a suitable candidate for molecular electronics; yet there are some improvements that can be done in order to use it practically. The single electron transistor (SET) operates through the tunnelling of electron via two tunnel junctions. Choosing a suitable island material plays a key role in the tunnelling of electron through the tunnel junctions. In the present work, the First principle calculations of carbon-nanotube and boron-nanotube based Single-Electron Transistors have been performed. The three types of configurations of nanotubes i.e. zigzag (5,0), armchair (3,3) and chiral (4,2), of the smallest possible diameter (approximately 4A ),have been used. The calculations have been carried out using Atomistic toolkit (ATK-VNL) simulation package which is a density functional theory (DFT) based package. In the present work, local density approximations (LDA) as well as generalized gradient approximation(GGA) have been used to demonstrate the properties of nanotubes-based SET. These approaches have been implemented for a nanotube that is lying just above the gate dielectric. On the either side of the dielectric the electrodes are present, source in the left and drain in the right. The metallic electrodes made of gold (W=5.28eV) and the dielectric material of the dielectric constant have been used. The charging energies and additional energies of both types of nanotubes-based SET in the isolated as well as in the electrostatic environment have been calculated using the approximations. The calculated values of the charging energies in the electrostatic environment have been found to be less than the charging energies in isolated configuration that shows the renormalization of molecular energy levels. Variations of total energies against gate voltages and Charge stability diagrams (CSD) have been discussed.
Marcelinus Christwardana, Linda Aliffia Yoshi
Reaktor · 2020
Experiments were conducted to study the correlation between current density and dissolved oxygen (DO) and to develop a model for estimating the value of current density in yeast MFC based DO biosensors. A curve between current density and DO was made, and data analysis was performed using free-online data fitting, namely zunzun.com. One linear regression and nine different exponential models are used as an approach to determine the correlation between current density and DO. The higher DO, the current density will increase rapidly. The most suitable model was chosen to describe the correlation between the current density and the DO. The coefficient of determination (R2), the sum of square absolute (SSQABS), and root mean square error (RMSE) are used to determine goodness or quality of fit. The exponential model shows a better fit to illustrate the correlation between current density and DO, with R2, SSQABS, and RMSE values were 0.9975, 0.4745 and 0.3444, respectively.
Mufid Ainun, Linda Suyati
Jurnal Kimia Sains dan Aplikasi · 2018
Study on bioelectrisity various carbon sources on the circuit series Microbial Fuel Cell using Lactobacillus plantarum has been conducted. This study aims to determine the electrical energy generated by various types of substrates in MFC and determe the effect of a series circuit of the electrical energy produced using Lactobacillus plantarum. The research stage consisted of preparation stages MFC components, electrical power measurements on variations in the type of substrate, and the measurement of electrical power in series circuit variation. Electrical power measurements were performed on a variety of substrate types by comparing the electrical power generated by the fructose, lactose and starch substrates while the electric power measurements with series variations are used in single series, series 2 and series 3. The results of the maximum electrical power measurement on the variation of fructose, lactose and starch substrate in MFC system using Lactobacillus plantarum were obtained respectively 10,26 mW; 63 mW and 27.47 mW. The maximum electric power generated in the MFC system uses Lactobacillus plantarum in a single circuit, series 2, series 3 series with lactose substrate obtained respectively of 63 mW, 164.74 mW and 290.51 mW. The measurement of electrical power showed that the lactose substrate produces a greater power than the other substrates. Series circuit capable of increasing electrical power in MFC system.
Zhuangzhuang Liu, Lei Zhou, Qi Chen et al.
Electroanalysis · 2016
Abstract The modifications of electrodes using graphene and graphene composites in microbial fuel cells (MFCs) and microbial electrolysis cells (MECs) have been widely applied for enhancing the electrochemical catalytic activity and performance of MFCs and MECs. Graphene as one of advanced materials has shown outstanding features for promoting practical applications of MFCs. This review summarizes the modification methods and characterization methods of graphene and related graphene composites on electrode surfaces in MFCs and MECs. The performance improvements of MFCs and MECs by various graphene related composites have been reviewed, which will provide an efficient guide for selecting suitable graphene material to modify electrodes in MFCs and MECs for improving their performance.
Muhammad Sohaib, Adeel Ahmed, Imran Aslam et al.
Current Graphene Science · 2019
Herein, the recent development and future perspectives of nanophotocatalysis has been discussed for the sustainable and green energy generation through microbial fuel cell (MFC). The artificial photosynthesis and biomass energy production methods have reviewed comprehensively. Further, the fabrication, fundamental aspects and purposes of MFC have been discussed to clearly elaborate the concept of energy production. A lot of effort have been done to convert light energy to biomass energy artificially which is then converted into electric or mechanical energy for further use. Recent age is facing plenty of challenges to convert the light energy to bioenergy.
Akihiro Kusuda, Xiu‐Hua Xu, Xin Wang et al.
ChemInform · 2011
Abstract Solkane® 365 mfc is proved to be an environmentally benign alternative solvent for the homocoupling reaction of terminal alkynes (I) under air to afford 1,3‐diynes (II) in high yields.
Tomasz Pajchrowski
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering · 2011
Purpose The purpose of the paper is to find a speed control structure with two degrees of freedom robust against drive parameters variations. Application of structure model following control (MFC) and fuzzy technique in the controller of PI type creates proper non‐linear characteristics, which ensures controller robustness. Design/methodology/approach The use of proper structure with two degrees of freedom and non‐linear characteristic introduced by fuzzy technique ensures the robustness of the speed control system. The paper proposes a novel approach to MFC synthesis to be performed in two stages. The first stage consists in the set value of P type controller of model and the process controller simultaneously should be designing by fuzzy technique. At the second stage of the synthesis consist in tuning parameters of process fuzzy controller by the swarm of particles method (particle swarm optimization) on the basis of a defined quality index formulated in the paper. The synthesis is performed using simulation techniques and subsequently the behavior of a laboratory speed control system is validated in the experimental setup. The control algorithms of the system are performed by a microprocessor floating point DSP control system. Findings Use of proper structure with two degrees of freedom of the non‐linear fuzzy controller guarantees expected robustness and improves the dynamics of speed control significantly. Research limitations/implications The proposed structure of MFC was tested on a single machine under well‐defined conditions. Further investigations are required before any industrial applications. Practical implications The proposed controller synthesis and its results may be very helpful in robotic system where changing of system parameters is characteristic for many industrial robots and manipulators. Originality/value The paper proposes an original method of synthesis of robust system with two degrees of freedom system validated by simulation and experimental investigations.
Yong Li, Ying Lan Jia, Qi Han Zhang et al.
Advanced Materials Research · 2013
To overcome the shorting of inorganic gelatinous such as cement in plugging jobs, MFC-GM plugging agent is developed. MFC-GM is composed of 20% network building material, 70% gelatinous material, 9% activators, and 1% technologic behavior regulator and is used in aqueous slurries with water to cement ratio 1:1.4-1.8. The results of laboratory performance properties evaluation show that the depth of MFC-GM slurries squeezed into sandpack is far less, and the plugging strength of MFC-GM is, about 25MPa, far higher than G grade oilwell cement. This phenomenon is explained in terms of the functions of ingredients and the structure. MFC-GM can be used for plugging perforations and water producing zones, processing following characteristics: plugging radius is less than 0.8m and adjustable; initial setting time in rang 2-6 hours adjustably. MFC-GM plugging agent can meet the needs of unconsolidated sand gas reservoirs and improve plugging effect of gas well water-flooded layer and leakage zone.
Heng Yang Liu, Ling Lu
Advanced Materials Research · 2011
This article first introduce the importance of C++ language in the course of object-oriented, and the teaching mode before. Aim at the problems in the past mode of C++ teaching, the author analyses the problems in essence. And then, the author proposes a new method that is combination of MFC in C++ language teaching. Because of the MFC's inherent characteristics and the MFC are packaged by C++ language grammar. The instruction overcome many problems that exists in the last C++ language teaching, such as dull, lacks vividness and the lack of achievement. At the same time, the author has successfully applied for this instruction mode in his own teaching process.
Galina Rodionova, Solenne Roudot, Øyvind Eriksen et al.
BioResources · 2012
Microfibrillated cellulose (MFC), TEMPO-pretreated MFC, and hybrid polymer/MFC mix were used for the production of layered films with interesting properties for application in food packaging. The series of samples were prepared from MFC (base layers) using a dispersion-casting method. The same procedure as well as a bar coating technique was applied to form top layers of different basis weights. The barrier properties and formation of the layered films were investigated in relationship to the preparation procedures, combination of layers, and areal weight (basis weight). Characterization was done with respect to oxygen transmission rates (OTR), water vapor transmission rates (WVTR), tensile properties, and contact angles (CA) with water. The produced layered films yielded OTR values of 4 mL m-2 day-1 and fulfilled oxygen barrier requirements for a modified atmosphere packaging (MAP). Hornification of the MFC films, however, occurred during drying, which may result in a loss of the film’s beneficial properties.
Jun Cheol Jeon, Jung Woo Sohn, Seung Bok Choi
Advanced Materials Research · 2011
In this paper, identification of dynamic sensing characteristics of MFC(macro fiber composite) and PVDF(polyvinylidene fluoride) are carried out via experimental investigation. A clamped aluminum beam structure is prepared and experimental setup for beam vibration test is established with shaker system. MFC and PVDF are attached on the top and bottom surface of the beam structure, respectively and connected to data acquisition system. In order to verify the operating bandwidth, frequency responses of the smart beam structure are obtained from 0Hz to 5kHz under sine sweep excitation. For the identification of dynamic sensing characteristics, experiments for linearity and durability are conducted. It is observed that both MFC and PVDF have excellent sensing performance in measuring dynamic response and monitoring structural vibration.
Arpita Nandy, Vikash Kumar, Moumita Khamrai et al.
RSC Advances · 2014
Schematic representation of the series of events occurring in a MFC run with vermicompost soil.
He Rui Li, Kai Ting Wen
Advanced Materials Research · 2013
In this paper, MFC mappings is introduced and Ky Fan matching theorems for MFC mappings with transfer compactly open values are established in noncompact complete FC-metric spaces. As applications, a Fan-Browder type coincidence theorem and a minimax inequality are obtained. Our results unify, improve and generalize some known results in recent literature.
Mohamed Shaik Dawood, L. Iannucci, E. Greenhalgh et al.
Applied Mechanics and Materials · 2012
The potential use of MFC actuator as a tool for reducing low velocity impact induced delamination has been investigated using LS-DYNA explicit finite element code. An induced strain piezoelectric actuation model was implemented into LS-DYNA through its user defined material subroutine to simulate the piezoelectric effects while a cohesive based damage model was used to predict delamination. The numerical study confirmed that delamination could be reduced but the MFC required very high actuation voltages even in the case of very low energy impact which is not practically achievable with the existing actuator. Assuming powerful actuators are not something impossible in near future, this study provide useful information for advancing composite impact investigation using piezoelectric actuator as an integrated tool for improving its impact tolerance.
Zai Ping Chen, Ya Jing Yang
Advanced Materials Research · 2013
With the rapid development of computer network, automation and electronic commerce, more and more industrial production are in urgent need of the convenient and efficient integration of production and management system to adapt to the change and solve the condition of the onerous task, low efficiency, high cost, personnel tension. This article focuses on a typical industrial management system which is based on C/S architecture and uses MFC application framework. And it introduces ADO technology as the middle bridge which is used by the client to access databases. What is important is that the dynamic link library is used in the system to help ADO access database. The ADO technology has the characteristics of easily-using, high speed, low memory expenditure and less disk space, which optimize the system, make the system realize the high performance, high compatible data access.
Yue Zhang, Yan Feng Xu
Advanced Materials Research · 2012
Management Information System (MIS) is an Integration information systems engineering of computer technology and network communications technology. It can be more accurate, timely, comprehensive, detailed record of the data, while further processing of all kinds of information. In this paper, MFC, GPS and GE (Google Earth) technology is used in managing Old and Valuable Trees information, to solve a series of existing problems of labor management. At the same time of improving the efficiency of information management, it can achieve the implementation of monitoring and tree information Virtual Tour by combination in GPS the point marked and Google Earth software.
Yu Man Lin, Hao Rao
Applied Mechanics and Materials · 2013
Currently Gobang online game is not perfect, the most important problem is the man-machine play and online play can not be implemented together. In order to solve the problem, a Gobang online game was developed which could be not only a man-machine game, but also an online game. The message mechanism was designed to manage messages from network. And the overall system architecture and the main algorithms were described accordingly.
Jun An, Jin Song Fan
Applied Mechanics and Materials · 2014
Augmented Reality(AR) technology aims to integrate virtual objects with real scene by using computer technology and to realize real scenes enhancing. This paper presented a research method of using osgART to develop AR application programs in MFC (Microsoft Foundation Classes) environment, and discussed some related techniques. Corresponding procedures are given in each section, and a design example for product evaluation and exhibition is presented. This example was developed by the presented method in this paper, and its system ran in good condition after repeated tests. From the results of this paper, it can be seen that by using MFC and osgART to develop AR application programs, the seamless integration and interaction between the real environment and virtual objects can been easily realized, which will be benefit to improve the efficiency of developing AR application programs.
Y.‐J. He, Z.‐F. Ma
Fuel Cells · 2013
Abstract This investigation is performed to study the optimal operation decision of two‐chamber microbial fuel cell (MFC) system under uncertainty. To gain insight into the mechanism of uncertainty propagation, a Quasi‐Monte Carlo method‐based stochastic analysis is conducted not only to elucidate the effect of each uncertain parameter on the variability of power density output, but also to illustrate the interactive effects of the all uncertain parameters on the performance of MFC. Moreover, a systematic stochastic simulation‐based multi‐objective genetic algorithm framework is proposed to identify a set of Pareto‐optimal robust operation strategies, which is helpful to provide an imperative insight into the relationship between the mean and standard deviation of output power density. The results indicate that (1) the coefficient of variance (COV) value of output power density has a linear relationship with the COV value of each uncertainty parameter as well as all interactive parameters; and (2) a significant performance improvement with respect to both mean and standard deviation of power density is observed by implementing the multi‐objective robust optimization. These results thus validate that the proposed uncertainty analysis and robust optimization framework provide a promising tool for robust optimal design and operation of fuel cell systems under uncertainty.
Michael Holzinger, Alan Le Goff, Serge Cosnier
New J. Chem. · 2013
Supramolecular systems based on host-guest, electrostatic, or metal-ligand interaction and their use in bioelectrochemical applications are reviewed.
M. Rodríguez Arredondo, P. Kuntke, A. W. Jeremiasse et al.
Environmental Science: Water Research & Technology · 2014
Removal of nitrogen compounds from wastewater is essential to prevent pollution of receiving water bodies. Bioelectrochemical systems enable energy-efficient nitrogen removal and even recovery of ammonia from wastewaters.
Tao Yin, Xiao Min Cai, Lin Su et al.
Advanced Materials Research · 2013
Sediment microbial fuel cells (SMFCs) can generate electricity without maintenance in the field. SMFC is considered as an alternative renewable and sustainable power source. Though the SMFC is very appealing energy source, it presents certain challenges for real applications. Its output voltage and current are very low and its output voltage cant be increased by stacking several SMFCs in series in an open water body such as the lake. In this research, we construct and simulate a field SMFC with sediment from Xuanwu Lake in Nanjing, China. Open-circuit voltage of the SMFC is 750 mV and the maximal power density is 7.8 mW/m 2 . A custom-designed power management system (PMS) is developed to harvest energy from SMFC and boost the output power that can drive a wireless sensor. With the PMS, wireless sensor can utilize the harvested energy from SMFC and transmit data to computer without additional power source.
X. Xu, B.Z. Tian, J.L. Kong et al.
Advanced Materials · 2003
The immobilization of cytochrome c (Cyt‐c) in ordered mesoporous niobium oxide thin films is investigated for the first time. The direct electrochemical behavior of Cyt‐c assembled onto the inorganic matrix (see Figure) and the electrocatalytic properties of this assembly are studied. The results open a new doorway for the application of niobium oxides as bioanalytical devices.
Wenyan Tao, Dawei Pan, Qian Liu et al.
Electroanalysis · 2006
Abstract Acidic treated multiwalled carbon nanotubes (AMWNTs) were ground with water‐miscible room temperature ionic liquids, 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([bmim]BF 4 ), and resulted in AMWNTs‐[bmim]BF 4 composite. Its electrical‐ionic conductivity and optical properties were compared with the other two types of carbon materials‐[bmim]BF 4 composites: pyrolytic graphite powder (PGP), pristine multiwalled carbon nanotubes (PMWNTs), through the ac impedance technology and Raman spectroscopy. The impedance data show that AMWNTs‐[bmim]BF 4 composite exhibits the highest conductivity. Raman spectra study exhibits that the [bmim]BF 4 can form gel with PMWNTs and AMWNTs but only form a viscous liquid with PGP. AMWNTs‐[bmim]BF 4 gel modified GC electrode was applied in direct electrochemistry of heme proteins (Hb and HRP) and it catalysis to the reduction of H 2 O 2 was investigated.
Huai‐Guo Xue, Zhi‐Quan Shen
Chinese Journal of Chemistry · 2002
Abstract A novel choline oxidase electrode was constructed by entrapping choline oxidase into polyaniline‐polyacrylonitrile composite film. The enzyme film was prepared by in situ electropolymerization of aniline into porous polyacrylonitrile‐coated platinum electrode in the presence of choline oxidase. The enzyme electrode exhibited sensitive and stable electrochemical response to choline. The kinetics analysis showed that the mass transport is partially rate‐limiting. The influences of pH, applied potential and temperature on the response of the enzyme electrode were also described.