Current Issue

Previous Issue | Next Issue

March 30,2017
Volume 10,Issue 6
Pages -
Subject Area:Composite Materials,Functional Polymer Materials,Geography,Exploration Geophysics,Drilling Engineering

Title: Research and design of multi-master communication substation based on CAN bus

Authors: WANG Peng, CHEN Guanjun, SONG Chao, MA Jihui, AN Ping, MENG Jinxue
PP: 649-655
Abstract: Effective coalmine safety monitoring is an important means to ensure the safety of the production under the coalmines. It is also one of the most important technical measures of the coalmine modern management. Therefore, the safety of the coalmine production is determined by the coalmine monitoring system. This paper designs an underground substation of the system. It introduces the design idea of multi-master communication substation of mine based on CAN bus, studies the hardware and software structure of safety monitoring substation, and analyzes communication technology based on CAN bus in detail. On the basis of the existing mine safety monitoring substation, this paper designs a new multi-master communication substation of mine with the core of micro controller C8051F040, meanwhile adopts the digital sensor to collect the information and transmits the information with CAN bus.
Keywords: mine safety; monitoring substation of coalmine; CAN bus; multi-master communication substation; digital sensor

Title: Study on the mechanism of particles increasing in dry etch chamber on TEL VIGUS machine

Authors: TANG Jiefeng, HUANG Qiyu
PP: 642-648
Abstract: This paper is a mechanism study for particles increasing problem in dry etch chamber on TEL VIGUS machine. This type of chamber is responsible for the process of 55 nm Damascus integrated etching process. Without industry experience, we determine particles increasing is due to the aging of o-ring in shutter shaft by the analysis of experiments data. Through in-depth analysis of the three causes for o-ring aging: effect of oxygen, temperature and mechanical friction, we take the use of uptime control, changing the o-ring materials and improving mechanical friction to avoid the aging problem of o-ring in shutter shaft, and finally we can control particles increasing effectively as well as increase the machine uptime for more than 2%. In the follow-up work, we plan to increase more than 5% uptime by looking for better o-ring materials and improving the process conditions continuously to extend the life time of shutter shaft o-ring.
Keywords: materials failure and protection; o-ring; shutter shaft; particle

Title: Preparation and properties study of CNTs-Fe3O4/PVDF composite

Authors: AN Ningli, YE Jingjing
PP: 621-626
Abstract: Fe3O4 modified carbon nanotubes (CNTs-Fe3O4) were prepared by in situhydrothermal synthesis method, and CNTs-Fe3O4/PVDF composite was prepared by solution blending method. The crystallization behavior, thermal performance and dielectric properties were studied. The results showed that the content of β-phase in PVDF matrix increased with the addition of CNTs-Fe3O4. Meanwhile, the thermostability and dielectric constant of the composite increased at a certain content.
Keywords: composite materials; PVDF; CNTs-Fe3O4; crystallization; thermal performance; dielectric properties

Title: Research advance in preparation of polymeric nanogels for drug delivery systems and controlled release

Authors: WANG Peng, XIA Zeyu, PU Hongting
PP: 589-597
Abstract: Nanogels are nano-sized (1-1 000 nm) hydrogel particles, which have attracted considerable attention due to their unique properties. As one of the most promising nanoparticulate drug delivery systems, it is easy to get to site-specific through biofilm barrier, and nanogels can be tailor-made to sense and respond to environmental changes in order to ensure spatial and stimuli-controlled drug release in vivo. This review presents a general view of the development in the field of nanogels and its bio-medical application as carriers for controlled drug delivery, the methods to prepare nanogelsand the future development are also concluded.
Keywords: organic macromolecule materials; nanogels; review; preparation; drug delivery systems

Title: Effects of biological soil crusts on soil nutrient contents and N2O flux in mid-subtropics

Authors: YANG Zhouran, CHEN Naishou, WANG Kai, CHEN Shidong, CHEN Yuemin
PP: 681-689
Abstract: To better understand the effects of biological soil crusts (BSCs) on soil nutrient contents and nitrogen retention in mid-subtropics. Soil covered by biological soil crusts (SCCs) and bare soil (BS) were collected intactly from surface soils of 0-5 cm depth and incubated in the laboratory at 25℃ by using equal pressure sampling method. The results showed that: 1) BSCs reduced inorganic nitrogen (IN) content in soils below crusts (SBCs), NO3−-N content in BS was signrficantly higher than that in SBCs (P<0.01), while BSCs enhanced soil nutrient contents of BSCs-soil system; 2) In dark condition, N2O emission flux in SCCs was higher than that in BS (P<0.01); however, N2O flux in SCCs showed absorption and that in BS was emission in light condition and alternation of day and night. Therefore, BSCs modify soil nutrient of BSCs-soil system and reduce soil nitrogen losses, which enhance nitrogen retention capacity and benefit the growth of Cunninghamia lanceolata.
Keywords: natural geography; biological soil crusts; soil nutrient contents; N2O flux

Title: Recent process in carbon based counter electrode materials of quantum dots-sensitized solar cells

Authors: ZHANG Maolin, JI Xuan, LI Zhimin, YAN Yangxi, DU Jiaxuan
PP: 580-588
Abstract: As an important component of quantum dots-sensitized solar cells (QDSSCs), the counter electrode (CE) makes a decisive influence on electron transmission and catalytic reductive process. The recent progress and trends of carbon based counter electrodes, including single carbon materials, carbon/noble metal nanoparticles and carbon/metal sulfides compound systems, used in QDSSCs are summarized in this work. The methods of fabricating carbon based counter electrodes are emphasized to decrease the charge transfer resistance (Rct), enhance the catalytic activity and improve the photoelectric property of QDSSCs. Considering the challenges of counter electrode, an outlook of new trend in this topic is discussed.
Keywords: solar energy; quantum dots-sensitized solar cells; review; counter electrode; carbon materials; compound system

Title: Study on microstructure and mechanical properties of Al-Fe-Cr-Ti alloys during isothermal forging

Authors: WU Jing, FENG Aihan, SHEN Jun
PP: 635-641
Abstract: Aluminum alloys have wide applications in the automotive and aerospace industries due to their high strength and light weight. Al-Fe-Cr-Ti alloys, which are commonly prepared by rapid solidification and powder metallurgy, have been widely studied due to their great mechanical properties and oxidation resistance at elevated temperatures. The current work investigates the microstructure and mechanical properties of Al-Fe-Cr-Ti alloys during isothermal forging. The results suggest that the alloys after isothermal forging have similar microstructures at all processing parameters. The ultimate tensile stress of alloys at room temperature is sensitive to the isothermal forging deformation temperatures, and decreases when isothermal forging deformation temperature increases. When the tensile tests are performed at 300℃, the ultimate tensile stress of the alloys is not sensitiveto the isothermal forging deformation temperatures, which is about 280 MPa.
Keywords: metallic materials; isothermal forging; Al-Fe-Cr-Ti alloys; microstructure; mechanical properties

Title: Fluid inclusion study of vein No.28 in Hadamengou gold deposit, Inner Mongolia

Authors: GE Zhanlin, ZHANG Yongmei
PP: 662-671
Abstract: Petrography and microthermometry were used to study fluid inclusions in 4 hydrothermal mineralization stages of vein No.28 in Hadamengou gold deposit systematically. It shows that there are three main types of fluid inclusions, including gas-fluid inclusions, daughter mineral-bearing inclusions and CO2-H2O three-phase inclusions. A small amount of pure liquid H2O inclusions, pure gas H2O inclusions and pure liquid CO2inclusions can also be observed. Hadamengou gold deposit belongs to medium-high temperature, medium salinity and medium-density hydrothermal mineralization and it formed in medium-deep ore-forming environment. During the process of gold mineralization, CO2 fluid prompted the gold in source bed to be activated and translated into soluble gold and provided important conditions for the complexing migration of the reductive sulfur and gold. Comparison of the characteristics of ore-forming fluid in both Hadamengou gold deposit and Liubagou gold deposit shows that they are very similar in both the nature and the evolution laws, and the two deposits also have the common source of ore-forming fluid.
Keywords: ore deposit geology and mineralography; fluid inclusion; petrological characteristics; microthermometry; CO2 fluid; Hadamengou gold deposit

Title: TiO2 loaded cellulose based catalytic activated carbon cotton fiber preparation and its photocatalytic performance study

Authors: YANG Zhiyi, GU Zhanyong, YANG Lin, WANG Xinlong, ZHANG Zhiye, YANG Xiushan, ZHONG Benhe
PP: 598-609
Abstract: TiO2 loaded cellulose based catalytic activated carboncotton fiber preparation has been successfully performed through the improved high temperature calcination with nitrogen process. The influences of crystal form and hollow structure of TiO2 on the synergistic photocatalytic behavior of the composite material during the degradation of methyl orange (MO) are studied. The novel catalysts have been characterized and analyzed by high-resolution transmission electron microscope (TEM), scanning electron microscope (SEM),energy-dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) analysis and photocatalytic test (UV-Vis test). The results show that the prepared TiO2/carboxymethyl composite material photocatalyst possess superior absorption capability and synergistic photocatalytic performance.
Keywords: functional polymer materials; TiO2; hollow-sized structure; synergistic effect; photocatalytic

Title: Preparation and properties study of PVDF/Chinese fir powder

Authors: XIA Weiwei, FENG Xia, ZHAO Yiping, CHEN Li
PP: 610-615
Abstract: This paper studies on Chinese fir powder modified PVDF microfiltration membrane preparation methods and the related properties. The blend membranes were prepared by immersion-precipitation phase transformation method. The modified membranes were characterized and tested by thermogravimetric analyzer (TGA), universal fabric tensile tester, static contact angle measurement analysis instrument. The results showed that, with the addition of Chinese fir powder, the hydrophilicity of the blend membranes increased firstly and then decreased, and the pure water flux was firstly increased and then decreased. When the Chinese fir powder content is 2%, the hydrophilicity, mechanical properties and porosity of the PVDF blend membranes increased obviously.
Keywords: polymer materials; PVDF; Chinese fir powder; blending modification; blend membrane

Title: Fabrication and characterization of a novel drug-eluting composite metal stent for common bile duct stone

Authors: GAO Qiang, HUANG Chao, SUN Binbin, CHEN Weiming, WANG Jing, WAN Xinjian, MO Xiumei
PP: 627-634
Abstract: A novel drug-eluting composite metal stent coated with polycaprolactone (PCL) layer in which loaded ethylene diamine tetraacetic acid (EDTA) & sodium cholate (SC) was fabricated for common bile duct (CBD) stone by the way of surface coating. And studies on EDTA&SC existing form in coating layer, radial mechanical properties, drug release and gallstone dissolution in vitrotest were carried out in this paper. Results showed that this novel drug-eluting composite metal stent prepared by surface coating possessed white smooth surface and an unobstructed lumen; as shown in the optical microscope images, scanning electron microscope (SEM) images and X-ray diffraction (XRD) spectra, uniformly dispersed EDTA particles were seen clearly in crystal state in the coating layer, but SC was in amorphous state. Radial compression mechanical properties proved perfect resilience and unchanged cross-section after removing the radical force. Besides, drug release time of this novel drug-eluting composite metal stent was over in the 28th day and the mass of gallstone reduced by 33.3% in vitro. This novel drug-eluting composite metal stent has potential application for CBD stone treatment.
Keywords: composite materials; polycaprolactone; ethylene diamine tetraacetic acid & sodium cholate; gallstone; stent

Title: Monitoring rift propagation on the Amery ice shelf front, Antarctica

Authors: LI Tian, CHENG Xiao
PP: 672-680
Abstract: We used Environmental Satellite (ENVISAT) C-band Advanced Synthetic Aperture Radar (ASAR) data and National Aeronautics and Space Administration (NASA) Landsat satellite data to monitor the lengths, widths and advance rates of two rifts T1 and T2 on the Amery ice shelf front from 2004 to 2016, and we also analyzed the propagation characteristics of rift tip in suture zones. The results show that the lengths and widths of two rifts have been propagating continuously, the annual length propagation rate of rift T1 is higher than rift T2, but the width propagation rate of rift T1 is lower than rift T2. Rift widening can’t necessarily result in length propagation. Besides, we find that suture zones can accelerate rift propagation rate, which verifies that rifts on Amery ice shelf front are mainly controlled by strain field distribution within ice shelf.
Keywords: geography; Amery ice shelf; rift; rift propagation; suture zone

Title: Interaction between HMP and NP in process of thermal degration

Authors: YANG Zhiyi, GU Zhanyong, YANG Lin, WANG Xinlong, ZHANG Zhiye, YANG Xiushan, ZHONG Benhe
PP: 616-620
Abstract: There is a cooperative flame retardant effect between hydroquinone bis(di-2-methylphenyl phosphate) (HMP) and novolac phenol (NP) in acrylonitrile-butadiene-styrene copolymer (ABS)/HMP/NP composite material. The thermal degradation mechanism of HMP has been successfully studied. This paper studies thermogravimetric (TG), derivative thermogravimetric (DTG) analysis and Fourier transform infrared spectroscopy (FTIR) under different temperatures. The results prove that HMP and NP interact with each other. HMP/NP lose hydrogen and form carbon layer easily and therefore prevent the mass loss in the process of heating.
Keywords: polymer materials; HMP/NP; thermogravimetric; Fourier transform infrared spectroscopy; formation of carbon layer

Title: Study on inversion of airborne transient electromagnetic methods based on differential evolution algorithm

Authors: WEN Laifu, LIU Guohui, WANG Tianyi, MA Ruitao, LI Wenjie
PP: 690-695
Abstract: A new and excellently intelligent optimization algorithm: differential evolution (DE) algorithm is introduced to the inversion of airborne transient electromagnetic methods (ATEM). The inversion program of DE algorithm is programmed based on the 1-D forward theory of ATEM. Then the typical geoelectric models are calculated by nonlinear inversion and good inversion results are achieved. Compared with the inversion results of the damped least square algorithm, this method is found to have a higher precision. The studies have shown that the DE algorithm has a high degree of fitting to the measured data, which improves the accuracy of inversion of the ATEM.
Keywords: exploration geophysics; airborne transient electromagnetic methods; differential evolution algorithm; damped least square method; nonlinear inversion

Title: Experimental study on the influence of supercritical CO2 on the mechanical properties of shale

Authors: GUO Xing, NI Hongjian, SUN Xue, LI Mukun, DING Lu, LIU Tianke
PP: 656-661
Abstract: The experimental study on mechanical properties of supercritical CO2 under different conditions can reveal its influence on the efficiency of rock breaking, borehole stability and fracturing. The experimental results indicate that: shale expands soaking in the supercritical CO2, and the uniaxial compressive strength of shale decreases after soaking; with the increasing of soaking time, the uniaxial compressive strength of shale decreases rapidly and then tends to be gentle; with the increasing of soaking temperature, the decline of the uniaxial compressive strength of shale decreases. This study provides the basic data support for the development of extraction of shale gas by supercritical CO2.
Keywords: drilling engineering; oil-gas well engineering; supercritical CO2; soaking; shale; mechanical property

Alert Name:
Alerting to:
Authentication email will be sent to your email address in 24 hours
Frequency:
Email Message Format:	Plain text Graphical(HTML)

Complete the form below and we will recommend the selected titles to your friends on your behalf. * Indicates a required field.
Your name*:
Your email address*:
Recipient's name*:
Recipient's email address*:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find the page(s) useful.

Your name:
Your email address:
Recipient's name:
Recipient's email address:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find this page useful.

Disclaimer: This message was sent to your friend using the "Send it to a friend" facility on the Sciencepaper Online’ WWW site, http://www.paper.edu.cn/en. The Sciencepaper Online is not responsible for the content of this email, and anything said in this email does not necessarily reflect the Sciencepaper Online's views.

	Check out RSS, or use RSS reader to subscribe this item