bluuebunny/crossref_metadata_2025 huggingface dataset:
Du traumatisme au fantasme : l’émergence du moi
Authors: Tavares de Almeida Conceição
Published: January 2017

Les révisions de la théorie de la séduction posent à nouveau le problème du traumatisme et du fantasme dans la métapsychologie de Freud. Par ailleurs, dans la ¬clinique actuelle, apparaissent des fonctionnements mentaux plus régressés, aussi bien que le récit à travers les enfants des patients. Au regard de la psychanalyse contemporaine, l’auteur propose une réflexion sur la reconstruction du fantasme à partir du traumatisme, illustrant avec un cas clinique, sensibilisé par la maternité, l’importance du jeu identificatoire, du processus onirique, et du cadre clinique en tant qu’espace potentiel générateur du tiers.
De l’inconscience du moi au moi inconscient, un gradient instanciel
Authors: Glas Jérôme
Published: January 2017

L’auteur propose une différenciation notionnelle entre inconscience du moi et moi inconscient se situant sur un gradient processuel de prise par les deux instances topiques que sont le ça, porteur de la négativité dans son rapport au moi inconscient, et le surmoi incons-cient, ainsi que les instances idéales pour le régime de l’inconscience du moi, vecteur de sa processualité générative. La dépendance et la prise par chaque ¬instance opérerait le procès de décohérence et spécifierait la cooptation des représentations aptes à la figuration des matériaux psychiques issus de la classique inconscience du moi ou rendrait compte des effets de la partition structurelle distinctive du moi inconscient.
Agirs, incident de séance et incidence du cadre
Authors: Coblence Françoise
Published: January 2017

L’incident de séance et les agirs de l’analyste et du patient sont souvent révélateurs de ce que l’on peut appeler l’inconscient du moi. Un exemple clinique illustre cette idée.
Le moi inconscient et l’agir
Authors: Godfrind Jacqueline
Published: January 2017

Le moi inconscient est envisagé dans son rapport à l’agir. Le moi inconscient se manifeste par des expressions agies, inconscientes et clivées, qui contribuent à la régulation de la trame transférentielle de base. À ces agirs transférentiels peuvent répondre des manifestations du moi inconscient de l’analyste, participant ainsi à la construction de l’espace analytique transitionnel.
Le transfert de pensée de l’Homme aux loups à M. P.
Authors: Birot Élisabeth
Published: January 2017

Dans la XXXe conférence, Rêve et occultisme, une part de la réflexion de Freud sur la télépathie prend racine dans ses mouvements et agirs contre-transférentiels au cours de la cure d’un patient, M.P. Sachant qu’il s’agit en fait de Sergueï P., revenu en 1919, ce texte donne en après-coup un éclairage sur la cure de l’Homme aux loups, et en particulier sur les enjeux narcissiques d’une relation thérapeutique marquée par l’homosexualité primaire.
Les cavaliers du dimanche
Authors: Diatkine Gilbert
Published: January 2017

Le moi inconscient, problématisé seulement avec la seconde topique, est présent dans l’œuvre de Freud dès L’Interprétation des rêves. Le moi inconscient de l’analyste joue un rôle essentiel dans l’interprétation, comme le montre un exemple tiré d’une cure supervisée. Le moi a une relation consciente et une relation inconsciente à chacun des trois maîtres qu’il sert, le ça, le surmoi, mais aussi le monde extérieur. L’action élaboratrice du moi inconscient passe par le préconscient.
Démonologie, animisme
Authors: Merot Patrick
Published: January 2017

Les phénomènes animiques restent très observables dans la clinique. La place que Freud leur a donnée dans la formation des religions retrouve une actualité avec les théories anthropologiques de Philippe Descola.
Sur le chemin du maléfique... Le moi inconscient
Authors: Lecoq Arlette
Published: January 2017

Le maléfique est pluriel et le moi inconscient polysémique. La figure du double de Dostoïevski, une réaction thérapeutique négative, une réflexion sur le négatif et l’inhumain font apparaître diverses facettes du moi inconscient mises au service du maléfique : surmoi, cli-vage, résistance, élaboration négative. Par ailleurs, certains artistes contribuent au travail de culture et à l’élargissement de la conscience de soi publique.
Prise en otage du moi inconscient dans le terrorisme religieux extrémiste
Authors: Hirsch Denis
Published: January 2017

Cet article traite des mécanismes intrapsychiques et inter-psychiques qui aliènent le moi inconscient dans le phénomène du terrorisme radical religieux. S’y intriquent ¬psychologie individuelle et psychologie collective. Trois niveaux complémentaires d’aliénation et de « prise en otage » du moi inconscient sont repérés : régression au moi-idéal et identification adhésive à l’idole totalitaire ; identification mélancolique au père déchu et surmoi cruel déshumanisant ; communauté de déni des différences et de clivage entre mécréant et « sur-musulman ». Le terrorisme radical confirme l’hypothèse d’un masochisme désintriqué de mort.
Paisajes culturales urbanos, oportunidad para la conservación del patrimonio y el turismo sostenible
Authors: Zárate Martín Manuel Antonio
Published: January 2017

A través del texto se demuestra la importancia de las «vistas urbanas de conjunto» y de los «escenarios urbanos interiores» como motivación para la visita turística de las ciudades históricas y la necesidad de desarrollar estrategias para su puesta en valor como producto turístico. De ese modo, los «paisajes culturales urbanos» generarían riqueza y empleo, y, por lo tanto, serían una alternativa a políticas que anteponen el uso del suelo para usos intensivos a consideraciones de tipo cultural e identitario. Sólo así se pondría freno a las amenazas de desaparición que sufren actualmente muchos paisajes culturales urbanos, a pesar de encontrarnos lejos del rápido crecimiento demográfico y fuerte urbanización de la década de 1960 y de la segunda mitad de los 1990 hasta 2007.
Un romanceamiento bíblico neotestamentario desconocido y la primera versión castellana de la Catena aurea
Authors: Rodríguez Molina Javier
Published: January 2017

Este artículo presenta el hallazgo de un texto medieval desconocido hasta el momento: fragmentos de un códice que contiene un romanceamiento bíblico neotestamentario de finales del siglo XIV distinto de todos los demás romanceamientos medievales identificados. La descripción del códice y la edición del texto se acompaña de un exhaustivo estudio lingüistico que permite fecharlo hacia 1400, así como de un análisis exegético que me ha posibilitado identificar parte del texto como una traducción de la Catena aurea de Tomás de Aquino al castellano, la primera identificada hasta el presente.
SÁ CARNEIRO, ANA RITA. PARQUE E PAISAGEM: UM OLHAR SOBRE O RECIFE. RECIFE: ED. UNIVERSITÁRIA DA UFPE, 2010. 168P.
Authors: Silva Joelmir Marques da , Melo Eliude Maria de
Published: January 2017

Resenha do livro 'Parque e paisagem: um olhar sobre o Recife' da arquiteta e urbanista Ana Rita Sá Carneiro, docente dos cursos de graduação (Arquitetura e Urbanismo) e de pós-graduação (mestrado e doutorado em Desenvolvimento Urbano) da Universidade Federal de Pernambuco e coordenadora do Laboratório da Paisagem.
Implementation Mechanochemical Synthesis of Titanium Carbide in the Presence of Carbon Components from Plant Raw Material and Graphite
Authors: Reva Viktor , Yagofarov Vladimir Yu. , Gulevskii Dmitrii A. , Filatenkov Aleksandr E. , Kuryavyi Valerii G. , Mansurov Yulbarskhon
Published: January 2017

Structure of carbon modifications, obtained via pyrolysis of vegetable feed, and ash content of natural graphite are crucial factors during mechanochemical synthesis of titanium carbide under vibratory conditions. The possibility of synthesis of titanium carbide with minimal sulfur content has been shown.
Research on the Structure of GdFeMn Compound
Authors: Zhao Shi Qian , Ma Lei , Zhou Liang , Liu Tao , Guo Yong Bin
Published: January 2017

The crystal structure of GdFeMn alloy has been investigated by using X-ray powder diffraction (XRD) followed by Rietveld refinement technique, differential thermal analysis (DTA) and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) techniques. XRD results showed that annealed GdFeMn alloy was a single phase of Gd6(Fe0.5Mn0.5)23 compound, with Th6Mn23-structure. SEM/EDS results and Rietveld refinement revealed that GdFeMn alloy was not really a new ternary compound as reported, but a solid solution Gd6(Fe0.5Mn0.5)23 which was only a point between Gd6Fe23 and Gd6Mn23. It was also found from DTA measurement that a reaction, Gd (Fe0.5Mn0.5)2 → liquid (rich Gd) + Gd6(Fe0.5Mn0.5)23, had taken place above 650.81 oC, and the educed Gd existed in educed part of GdFeMn sample. The results demonstrated the real structure of the GdFeMn compound as reported was Gd6(Fe0.5Mn0.5)23 compound.
The Study of High Temperature Oxidation Performance of Thermal Barrier Coatings Prepared by Plasma Spraying and Laser Remelting
Authors: Hua Yin Qun , Shuai Wen Wen , Liu Wei , Chen Rui Fang , Cao Jiang Dong
Published: January 2017

The CoCrAlYTaSi/YSZ thermal barrier coating was prepared on the surface of GH586 by plasma spraying and laser remelting process. The coating prepared by plasma spraying, YSZ have no phase transformation. After remelting, YSZ also have no phase transformation, but the grain of the preferential growth orientation changed. Plasma spraying coating is mainly composed of t and t' phase, all the t phase transform into t' phase and recrystallization after remelting. After remelting, the substrate grain and γ' phase size are obviously grown up, leading to the decrease of high temperature oxidation resistance of substrate. In the process of oxidation, no obvious phase transformation are taken place in the plasma spraying coating, and the coating after laser remelting, tetragonal-monoclinic phase transformation happened.
Study on Wear Resistance of Two Types of Low Phosphorus Electroless Nickel Plating on 30CrMnSi
Authors: Wang Jian Jian , Li Si Ran , Su Xun Jia , Hou Gen Liang , Song Bi , Liu Chao Hui
Published: January 2017

Acid Ni-P and alkaline Ni-P coatings were prepared on 30CrMnSi alloy steel by electroless plating method. 3 pH values were selected for each type. The phosphorus content, hardness and wear resistance coefficient of the 6 kinds of coatings were tested. Experimental results showed that the mass fraction of P was less than 4% range, with the increase of P content, the hardness and wear resistance of two kinds of coating had been improved, the hardness and wear resistance of acid coating were better than that of alkali coating.
Preparation of NixCo3-xTiO4 Ternary Nanowire and Study on their Electrocatalytic Performances
Authors: Zhang Xiao Bo , Liu Hai Ping
Published: January 2017

In this paper, NixCo3-xTiO4 nanowire as anode materials was prepared by co-deposition method, and the characterized results showed that had good crystallinity by SEM. The cobalt and nickel were enriched in the surface in the sample by XPS. The catalytic performance of NixCo3-xTiO4 was studied by cyclic voltammetry and constant potential. The results showed that when the Co: Ni = 4:1, the temperature was 120°C, NixCo3-xTiO4 nanowires had high catalytic activity and good stability by the cyclic voltammetry and the steady state polarization curves.
Microwave Absorption Properties of BaFe12O19 Prepared in Different Temperature with Polyaniline Nanocomposites
Authors: Feng Wang Jun , Zhao Xing , Zheng Wen Qian , Gang Jun Tao , Cao Yue , Yang Hua
Published: January 2017

The BaFe12O19 nanoparticles was prepared by sol-gel method in different temperature (750°C,850°Cand 950°C), and then BaFe12O19/polyaniline nanocomposites was synthesized by in situ polymerization. The XRD, FTIR spectra, SEM and vector network analyzer were used to analyze the "" chemical component, morphology and microwave absorption property of the nanocomposites. The result show that BaFe12O19 can be generated at 750°C without any impurity ,and its size increased with increase of calcination temperature.BaFe12O19 nanoparticle was coated with polyaniline partially, and we can get it have interaction with polyaniline through FTIR spectra. While the ferrite calcined at 850°C,the thickness of the absorbing material is 4.5mm,the nanocomposites have the largest reflection loss of-17.6 dB at 6 GHz,and its reflection loss values less than−10 dB in the range of 5-7.4GHz.
Research on Worktable Control of the Mask Exposal Forming Machine
Authors: Zhang Chuan Wei , Ning Nan , Zhang Meng
Published: January 2017

In view of the mask projection stereolithography of rapid prototyping technology, the hardware system of the mask exposal forming machine is constructed of a carriage, a resin tank, stepping motor, ball screw and other components. And its working principle is introduced. Based on googol motion control card, software control system is developed in VC6.0 environment, provides a human-computer interactive platform for operators. And the experiments show that the system can run reliably.
Research on Process and Property of H13 Die Steel Directly Manufactured by Selective Laser Melting
Authors: Chen Shuai , Tao Feng He , Yang Jian Chun , Jia Chang Zhi
Published: January 2017

The process of selective laser melting direct manufacturing based on H13 Die Steel is studied to explore the optimized process of H13 mold products. Laser linear energy and two critical process parameters including laser power and scanning space are carried out process validation and analysis, test the mechanical performance of samples manufactured, analyze the surface morphology and microstructure of the representative samples. The result shows that with the laser power of 180W, scanning speed of 450 mm/s, laser linear energy of 0.40 J/mm, the sample manufactured directly by selective laser melting with 57 HRC surface hardness which is higher than the coasting standard. The internal structure of the sample is homogeneous, and the defects such as pore and spherify are less.
Numerical Simulation of Flow and Heat Transfer for Cooling Roller in Amorphous Spinning Process
Authors: Li Yong Kang , Yang Yang , Song Yan Ming , Zhang Fei Ran
Published: January 2017

Numerical simulation of cooling roller in planar flow melt spinning process was accomplished using CFD software, Get cooling water flow characteristics and the cooling roller wall temperature and pressure distribution with cooling roller rotation speed range 0-50r/s, The results show that: heat transfer coefficient h and Nusselt number between the cooling water and the inner wall surface of a copper roller creases with the increase of the cooling roller rotate speed, but the increase rate is relatively small; Effect of cooling roller rotate speed on inner wall pressure is large, cooling roller inner wall pressure increases with the rotation speed increase. This study provided a theoretical reference of amorphous cooling roller design and optimization.
A Comparison Study of the Rapid Setting Conventional and Polymer-Modified Waterproof Mortars
Authors: Li Yan Wen , Xue Xiao , Yang Zhuo , He Zhong Yu , Qin Jie , Zhang Wei Dong , Xu Li Jin , Qu Jian , Jia Ru Feng
Published: January 2017

The mechanical properties, including the compressive strength, flexural strength and adhesion strength of the rapid setting conventional and polymer-modified waterproof mortars are systematically compared in this paper. The polymer modification is demonstrated to increase the flexural strength and adhesion strength of the rapid setting waterproof mortar whereas it reduces its compressive strength.
Study on the Aging and Pore Structure of Hydraulic Concrete
Authors: Niu Zhi Guo , You Ri , Li Wei , Guan Fu Hai
Published: January 2017

The aging of hydraulic concrete structure is a highly complicated problem. To reasonably evaluate the aging situation of a long-term operating concrete sluice, the core samples are obtained by field sampling from the sluice piers and the mercury injection experiment is carried out in this paper. The main objectives of this experimental investigation are to analyze the pore structure characteristics of the different parts in core samples and discuss the concrete aging rule of hydraulic concrete structure. The experimental results show that the aging of the hydraulic concrete has a certain relationship with the evolution of the concrete pore structure. It is feasible to use the pore structure of concrete to express the concrete aging of the hydraulic structure. The research in this paper will provide a basis for further study on the aging mechanism of the hydraulic concrete structure.
Nonlinear Ultrasonic Properties of Stress in 2024 Aluminum
Authors: Yan Hong Juan , Liu Feng Bin , Pan Qin Xue
Published: January 2017

Perturbation method is used to resolve one-dimensional wave equation under the assumption of small strain conditions. The relationship of the second order relative nonlinear coefficients (SORNC) β', the third order relative nonlinear coefficient (TORNC) δ' as the functions of fundamental and harmonic amplitudes is determined. The specimens are loaded from-200 MPa to 320 MPa at increments of 40 MPa by the electron universal testing machines. The SORNC β' and TORNC δ' are detected by the nonlinear ultrasonic testing system when ultrasonic waves propagate in the specimens. Results show that the relative nonlinear coefficients increase with the stress. The SORNT β' is approximately linear with the stress when stress is lower than 84.6% of the yield strength. The TORNC δ' is approximately linear with the stress when stress is lower than 76.9% of the yield strength.
Preparation and Luminescent Properties of 0.1%Ce3+:BaF2 Laser Ceramics by Vacuum Sintering
Authors: Jiao Ya Mei , Luo Jun Ming
Published: January 2017

0.1% Ce3+:BaF2 powders were prepared by coprecipitation method. Then the transparent ceramics were prepared by vacuum sintering. The effectts of sintering temperature and holding time on transparent ceramics were studied. The results show that the 0.1% Ce3+:BaF2 powders prepared by coprecipitation are approximately spherical with the size ranging from 200~300nm and good dispersion. The maximum light transmittance of the 0.1% Ce3+:BaF2 transparent ceramics reaches 69.2% when the sintering temperature is 1275°C. The fluorescence intensity of the transparent ceramics enhances with the increase of the sintering temperature. There are two characteristic f-f transition emission peaks at 610nm and 650nm when the excitation peak is at 290nm. The maximum transparency of 71.4% emerges when the holding time is 6h at 1275°C and the fluorescence intensity reaches the maximum. The 528nm (5D1→2F7/2) appears when excitated by the 524nm excitation light.
Deliquescence of NaCl and Atmospheric Corrosion of 316L Stainless Steel
Authors: Al Mehrzi Ahmed , Yi Yong Sun , Cho Pyung Yeon , Al Saadi Sara , Lee Ji Sung , Choi Daniel S.
Published: January 2017

Water droplets formed by the deliquescence of pre-deposited NaCl on 316L stainless steel were investigated. Different total weights of NaCl particles between 0.0005 g and 0.01 g were deposited on 316L stainless steel surface, which were exposed to an atmospheric condition at 80oC and relative humidity of 80% until NaCl droplets were stabilized. The volume of NaCl droplet was linearly proportional to the total weights of pre-deposited NaCl and consequently the chloride concentration in droplets, ranging from 3 to 6 M, did not depend on the NaCl weights. After exposed to the NaCl droplets at 80oC and relative humidity of 80% over 5, 10, and 15 days, all 316L stainless steel samples suffered from pitting. The Cl- ions in the surface films of samples were measured by ToF SIMS. The pit densities on samples were well correlated with the Cl- intensities in the surface films. These results suggest that the pit initiation under NaCl droplets by deliquescence is caused by the Cl- ions either incorporated into surface films or penetrated through them.
Synthesis of Calcium-Deficient Carbonated Hydroxyapatite as Promising Sorbent for Removal of Lead Ions
Authors: Le Van Thuan , Dat Doan Van , Nguyen Phuc Cao , Trubitsyn Mixail Aleksandrovich
Published: January 2017

This study is devoted to the synthesis of calcium-deficient carbonated hydroxyapatite and the modeling study of its sorption capacity for heavy metal ions on the example of Pb2+. Sorption of Pb2+ ions was investigated in physiological conditions. It was found that the synthesized calcium-deficient carbonated hydroxyapatite is nanosized and has an excellent sorption capacity for Pb2+ ions – up to 588 mg/g. Characterization of the solid particles after sorption by XRD and FTIR methods showed that in the sorption process, a new crystal phase of hydroxypyromorphite was formed. Also, the sharp decrease of pH in the initial period when the material is exposed to the heavy metal solution was explained. This effect is attributed to the fast formation of the surface complex =POPb+, followed by the dissociation of structural water molecules in the surface layer of the material under the influence of the adsorbed lead ions.
Electrochemical Ultra-Low Detection of Isoniazid Using a Salicylaldamine Functionalised G1-DAB-(NH2)4 Dendritic Sensor vs. UV-VIS Spectrophotometric Detection
Authors: Rassie Candice , Van Wyk Juanita , Wilson Lindsay , Ntshongontshi Nomaphelo , Jonnas Anovuyo , Feleni Usisipho , Ajayi Rachel Fanelwa , Baker Priscilla , Iwuoha Emmanuel
Published: January 2017

A poly(propyleneimine) based dendrimer was synthesised and successfully functionalised with a copper centre within its branches. The dendrimer and corresponding metallodendrimer were successfully characterised using FTIR, HR-TEM and HR-SEM in order to determine the effect of the inclusion of copper into the dendritic structure. The incorporation of copper caused crystallinity as revealed in the HR-TEM and a sheet-like morphology as shown in the HR-SEM images. The resulting metallodendrimer was then applied as an electrocatalytic platform for the sensing of a first line TB drug called isoniazid. This method was compared to a routine laboratory detection using UV-Vis and was found to be much more sensitive to trace amounts of isoniazid in solution. The electrochemical detection was found to have a limit of detection (LOD) of 0.233 nM compared to 11.47 nM using the Ultraviolet-visible spectroscopy method.
Blue-Shift of Ultraviolet Luminescence in Rough Surfaced ZnO Nanotubes Embedded in the AAO Template
Authors: Yang Lei , Jiang Zhong Cheng
Published: January 2017

Polycrystal ZnO nanotube arrays with outer diameter about 46 – 70 nm have been fabricated by annealing zinc oxalate in the pores of anodic aluminum oxide (AAO) template. Each nanotube is made up of small nanoparticles with the average size of 4 –7 nm. The nanotubes embedded in the pores of AAO template constitute to a kind of quantum wells arranged alternatively by ZnO, Al2O3 and thin air layer. Rough surfaced structure increases the interactions between these layers, and enhances the quantum confinement effect. Similar to the ZnO/Al2O3 multiply layer structure, a strong near-band edge emission at about 336 nm is observed under the excitation of 220 nm. The blue shift of the near band transition originates from the raises of the Fermi level of ZnO nanotubes generated by the addition of donor Al3+. With the decrease of wall thickness, this ultraviolet peak becomes broad and stronger. Under the excitation of 380 nm, a main emission platform from 430 nm to 530 nm appears originated from the transition from conduction band tails to valence band tails contain a complex mechanical strains effected by many crystal defect. The higher energy emission properties may have potential applications for the ultraviolet light-emitting diodes and laser diodes.
RETRACTED: Synthesis and Characterization of Carbon Black-Halloysite Nanotube Hybrid Composites Using XRD and SEM
Authors: Nallusamy S.
Published: January 2017

Composite materials are the leading emerging materials over the past twenty years since its introduction. Among the natural composites, carbon black-halloysite nanotubes hybrid composite is one of the recent emerging sector in the composite field, because of its high strength with less density as compared to the metal matrix composite. In this research carbon black-halloysite nanotubes hybrid composites based on synthetic rubber copolymer of acrylonitrile and butadiene were prepared and tested. The carbon black loading was kept fixed at sixty per hour and halloysite nanotube loading was varied from zero to ten parts per hundred rubbers per hour. The effect of carbon black-halloysite nanotube hybrid fillers on the curing behaviour, mechanical properties and morphology of the high nitrile rubber nanocomposites were investigated. The cure characteristics showed that the scorch time and cure time increased with the halloysite nanotube loading. The maximum torque exhibited an increasing trend from zero to six per hour. The tensile properties which exhibited an increasing trend until an optimum loading of six per hour were mainly influenced by the high nitrile rubber-carbon black-halloysite nanotube interaction and the intercalation of rubber and carbon black into the tubules. X-ray diffraction test and scanning electron microscope studies were supported to the results obtained.
Nanostructure of Fe-C Alloys Prepared by Arc Melting in Vacuum
Authors: Karoutsos V. , Venetsanos Odyseas , Geralis Dimitris , Poulopoulos Panagiotis , Politis C.
Published: January 2017

Three different Fe-C alloys were prepared in vacuum using the arc melting method: hypereutectoid (1.4% C), eutectoid (0.76% C) and hypoeutectoid (0.4% C). Unlike commercial steels, which they always contain Mn and other impurities, our samples were prepared by using high quality powders (99.999 wt.%). The samples were heat-treated and then observed with optical and scanning electronic microscopy (Zeiss EVO MA10). Selected samples were tested by microidentation (microhardness test). After isothermal transformation at 350 °C fine bainite nanostructures were observed in the hypoeutectoid sample, the mean size of which was found to be 50 nm. With the eutectoid sample, following different heat treatment procedures different micro-and nanostructures were measured: pearlite lamellar spacing, spheroidized cementite particles, and martensite needles, whose mean size is 145 nm, 290 nm and 200 nm respectively. The nanostructure of hypereutectoid sample after isothermal transformation at 650 °C, reveals the eutectoid and proeutectoid cementite lamellas with a mean spacing of 390 nm. X-ray diffraction pattern of eutectoid sample indicated the existence of cementite (Fe3C) content which is also confirmed by carbon mapping of pearlite colonies performed with Energy Dispersive X-ray Spectroscopy. The Vickers hardness of the samples compares well to the one of corresponding commercial steels.
Synthesis and Tribological Properties of TiSe2 Nanoparticles
Authors: Shi Qin , Xu Jing , Dang Li Feng , Chen Jun , Tang Guo Gang , Zuo Wen Yan , Zhu He Jun , Li Chang Sheng
Published: January 2017

TiSe2 nanobelts/nanoplates have been successfully fabricated through a facile and environment-friendly pressureless sintered process using micro-sized Ti and Se elements as raw materials. The morphology and structure of the as-prepared TiSe2 products were investigated by X-ray diffractometer, scanning electron microscopy, transmission electron microscopy and high resolution transmission electron microscopy. The experimental results indicated that the morphology of TiSe2 products were strongly dependent on the reaction temperature and reaction time. As the reaction temperature was set at 600°C and 800°C, long belts-like and plates-like structures of as-prepared TiSe2 products could be observed, respectively. However, a mixture of nanobelts and nanoplates could be obtained at a reaction temperature of 700°C. It was also found that the reaction time played a crucial role in obtaining the homogeneous distribution nanoparticles, therefore, reasonable reaction process and formation mechanisms of as-prepared TiSe2 nanoparticles were proposed. Moreover, the tribological properties of the TiSe2 nanobelts/nanoplates were investigated. The test results showed that the addition of TiSe2 nanoparticles could improve the tribological properties of base oil. Furthermore, the friction coefficient of base oil containing TiSe2 nanoplates was lower and more stable than those of TiSe2 nanobelts and pure base oil.
Structure and Characteristics of Carbon Nanotube Reinforced SiC Composite
Authors: Li Qiang , Zheng You Jun , Xia Jin Feng , Jiang Dan Yu
Published: January 2017

Carbon nanotube plays an important role in various applications due to its extreme optic, electronic and mechanical properties. In the present work, attempts have made to investigate the effects of incorporation of multiwall carbon nanotubes (MWNTs) on microstructure and mechanical properties of SiC composites. Firstly, carbon nanotubes were modified by chemical method in order to add carboxyl group on their surface. Then modified carbon nanotubes were located on the surface on SiC particles by silicon coupling agent. A designed carbon nanotube reinforced composite was obtained after pressureless sintering. SEM was employed to investigate the micro-structure of as-prepared SiC material. Its properties of, such as density, hardness, strength, etc. were determined in detail. The relationship between the micro-structure and properties of carbon nanotube reinforced SiC composite were discussed.
Microstructure and Mechanical Properties of ZrB2-SiC-ZrSi2 Composites Fabricated by Spark Plasma Sintering
Authors: Chen Chen , Lv Chang Chun , Wang Cheng Biao , Peng Zhi Jian
Published: January 2017

In this work, we fabricated ZrB2-SiC-ZrSi2 composites containing different fractions (0.5-5 vol.%) of ZrSi2 by spark plasma sintering at 1600 °C under a uniaxial pressure of 30 MPa. The addition effect of ZrSi2 on the composition, microstructure and mechanical properties of the composites were investigated. The results indicated that the densification of ZrB2-SiC-ZrSi2 composites could be enhanced along with the increase of the added fraction of ZrSi2, with its relative density reaching the maximum of about 85.6% when 3 vol.% of ZrSi2 was added. The hardness of the composites would decrease after the addition of ZrSi2 in the range of 960-1200 HV5. The flexural strength initially increased and then decreased with the addition of ZrSi2, reaching a maximum of about 330 MPa when 3 vol.% of ZrSi2 was added.
Microstructures and Mechanical Properties of Y2O3 Ceramics
Authors: Zhu Tong Yu , Xia Jin Feng
Published: January 2017

Currently, Y2O3 ceramics are widely used in various fields. The basic performance of Y2O3 ceramics were sintered temperatures are studied in this paper, their phase compositions and microstructure are studied with XRD and SEM. The mechanical properties of Y2O3 ceramics at different temperatures are studied. The sintering temperature of Y2O3 ceramic significantly affected the final grain size and density. It was found that a high density and fine average grain size of Y2O3ceramic can be simultaneously achieved when the sintering temperature was 1600°C. To determine the best sintering temperature, grain size, density, and mechanical properties were considered, and the most suitable sintering temperature was found to be 1600°C.
Densification Mechanism of Al2O3/Al Metallic Ceramics Prepared via Powder Metallurgy Method
Authors: Wang Rui Hua , Li Yao Qi , Yu Si Yuan , Wang Xiu Qin , Song Jie Guang , Yang Chao , Du Da Ming , Wang Fang , Li Shi Bin
Published: January 2017

Alumina ceramics with good mechanical and corrosion resistance, is one of the most widely used engineering ceramics. The aluminum has a high strength, high conductivity, high plasticity, etc. than aluminum ceramics used in more and more industries. In this paper, aluminum and alumina powder as raw material, mixing, forming, sintering and a series of processes for preparing the alumina/aluminum metallic ceramic materials, through performance testing and analysis can be found in the ratio of raw materials 50wt% Al, 50wt % Al2O3 relatively good moldability. After sintering, after measuring the density contrast is found better density in the pressing process pressure of 20MPa and holding pressure time for 20min. By comparing the sintering process, after the interface structure by scanning electron microscopy and found help improve density through the secondary sintering metallic ceramic materials.
Preparation and Microwave Dielectric Properties of xBaZn2Ti4O11-(1-x)BaNd2Ti4O12 Ceramics
Authors: Wang Xu , Fu Ren Li , Xu Yue , Yang Yang , Cai Jun De , Luo Ju Hua
Published: January 2017

xBaZn2Ti4O11–(1-x)BaNd2Ti4O12 (x = 0.18–0.30) ceramics were prepared by solid-state reaction method and their microwave dielectric properties were investigated with the purpose of finding a microwave ceramics with high dielectric constant (εr), high quality factor (Q×f ) and zero temperature coefficient of resonant frequency (τf).The two phase system BaZn2Ti4O11–BaNd2Ti4O12 affected the unit cell volume and the microstructure, the microwave dielectric properties (εr, Q×f, τf). As increasing x from 0.18 to 0.30, the main phase composition was BaNd2Ti4O12. Therefore, the εr decreased from 64.9 to 60.3 and the Q×f values raised from 11,350GHz to 13,210GHz, and the τf values decreased from 7ppm/° to -5ppm/°.The 0.22BaZn2Ti4O11–0.78BaNd2Ti4O12 ceramics sintered at 1250°C for 4 h displayed the best dielectric constant εr,Q×f and τf, as 63.9, 12380 GHz and-0.1 ppm/° respectively.
Influence of Different Gd3+ Doping on the Upconversion Luminescence Properties and Morphology of NaYF4:Yb,Er
Authors: Zhong Cui Ping , Duo Shu Wang , Zhang Jie Jun
Published: January 2017

Rare earth nitrate as the raw material, NaY/GdF4 upconversion luminescent nanoparticles were prepared by hydrothermal method, its diameter is about 200nm. By changing the Gd3+ doping amount achieved NaYF4 transition from the tetragonal to hexagonal phase, and the upconversion emission intensity can be improved by optimizing Gd3+ content. In 980nm excitation light source for the fluorescence test showed that the introduction of Gd3+ can effectively promote size reduction of NaY/GdF4 crystals and decrease luminous intensity. Through mechanism analysis we know that is related to nanosize effect. At the same time, we discussed the upconversion luminescence mechanism of NaY/GdF4 nanocrystals luminous intensity in different wavelength bands and the SEM show the morphology transformation from spherical to double-flower.
Investigation on the Preparation and Properties of Monodispersed Spherical Y2O3:Dy3+ Phosphor
Authors: Li Jin Kai , Liu Zhong Peng , Luo Jiang Fan , Ma Xin Bo , Teng Xin , Liu Zong Ming
Published: January 2017

The oxide phosphor (Y1-xDyx)2O3(x=0-0.1) was obtained by calcining their respective precursors synthesized by homogeneous precipitation technique using rare earth nitrate as mother salt and urea as precipitating agent. The particle shape/size, fluorescent properties (especially the influence of Dy3+ concentration and calcination temperature) of the product was studied in detail. The results showed that the precursors exhibit monodisperse spherical morphology whose size can be controlled by adjusting the urea content. The phase pure (Y1-xDyx)2O3 can be obtained by calcining precursor at least 600 °C, and the monodisperse spherical morphology can be kept at even high temperature of 1000 °C. The (Y1-xDyx)2O3 phosphors exhibit strong yellow emission at ~577 nm (4F9/2→6H13/2 transition of Dy3+) and blue emission at ~491 nm (4F9/2→6H15/2 transition of Dy3+) upon optimal excitation wavelength of ~352 nm. The quenching concentration of Dy3+ was determined to be ~2 at% (x=0.02). The emission intensity of (Y1-xDyx)2O3 phosphors can be improved with the temperature and particle size increasing
New Characterization Method of Hot Metal Penetration Resistance for Blast Furnace Carbon Blocks
Authors: Li Yi Wei , Li Ya Wei , Ge Shan , Yin Yu Сheng , Zhu Qing You , Liu Zhi Qiang , Sang Shao Bai
Published: January 2017

The main causes for deterioration of carbon blocks are due to the penetration and dissolution of hot metal against pores and surfaces. The active national standard GB/T 24201-2009 can only judge the hot metal dissolution, but the penetration of hot metal during test has been neglected. On the basis of national standard, a new measurement and characterization method is proposed. The study shows that with the help of back-scattered electron detect technology combined with statistical analysis, the penetration depth of hot metal could be quantitative evaluated, which could provide a reference for optimize the production of blast furnace refractories.
Effect of the Ratio of Co to Ni+Co on the Microstructures and Mechanical Properties of Ti(C, N)-Based Cermets
Authors: Wu Peng , Liu Shao Cun , Jiang Xiu Rong
Published: January 2017

The microstructures of the prepared Ti(C, N)-based cermets with various ratios of Co to Ni+Co were studied using X-ray diffractometry (XRD) and scanning electron microscopy (SEM). Mechanical properties such as transverse rupture strength (TRS), fracture toughness (K1C) and hardness (HRA) were also measured. The results showed that when Ni was partly replaced by Co, the core size of hard particle and the thickness of rim phase changed. With the increasing of the ratio of Co to Ni+Co, the porosity of the cermets increased gradually, the fracture toughness of the cermets decreased gradually, the transverse rupture strength increased firstly and then decreased, the hardness changed slightly。When the ratio of Co to Ni+Co was 0.2, the cermets had better transverse rupture strength (TRS), which was characterized by fine grains and the moderate thickness of rim phase in the binder.
Hot-Press Sintering of Tic0.5N0.5-Based Cermets: Addition Effect of AlN Nano-Powder on Microstructure and Mechanical Properties
Authors: Lv Chang Chun , Zhai Yu Jia , Wang Cheng Biao , Peng Zhi Jian
Published: January 2017

TiCN-based cermets were prepared by hot-press sintering through adding various amounts of AlN nanopowder (0-20 wt.%) into a 64 wt.% TiC0.5N0.5-10 wt.% WC-8.5 wt.% Mo-12.5 wt.% Ni-5 wt.% Co system. The microstructure and mechanical properties of the prepared cermets were investigated. For the prepared cermets, samples with 5 wt.% AlN nanopowder exhibited optimum mechanical properties of Vickers hardness 2191 HV10, bending strength 601 MPa, and fracture toughness 6.03 MPa.m1/2, respectively.
Fluorescence Enhancement of Europium-Doped Yttrium Oxide Nanosheets Modified by HTTA
Authors: Guan Qing Mei , Li Zhen Jie , Ma Fei , Zhang Lin , Miao Hui
Published: January 2017

Stable Eu3+ doped single-layer rare-earth oxide nanosheets sol were successfully obtained via exfoliation of layer Y(1-X)EuxOBr in n-butanol solvent. After β-diketones modifying, novel inorganic/organic luminescent hybrids were successfully synthesized. At the mean time we discovered that the main charge transfer (Eu-O) excitation bands in nanosheets were replaced by more efficient π-π* electron transition excitation band s of the organic ligands in the hybrids. The emission bands of the 5D0-7F2 electric dipole transition in hybrids were enhanced greatly.
Glass Surface Stress Measurement and Digitalization
Authors: Li Jun Feng , Bao Yi Wang , Han Song , Qiu Yan , Ai Fu Qiang
Published: January 2017

Surface stress measurement is the key factor of the quality control for tempered glass. The nondestructive test of glass surface stress is based on the character of stress birefringence in glass. The basic principle of the measurement and test methods are introduced. The optical waveguide effect of tin-diffused layers plays a key role in prevalent surface stress measurements. The apparatus are compared for optimizing the testing devices. A portable digitalized surface stress meter based on optical waveguide effect is developed, which can work in severe optical conditions and reduce operation difficulty. The calibration record shows good linearity.
Test and Analysis of Hydroxyl Group in CVD Synthetic Silica Glass
Authors: Jia Ya Nan , Wang Yu Fen , Nie Lan Jian , Xiang Zai Kui , Wang Lei , Liu Fei Xiang , Rao Chuan Dong
Published: January 2017

Hydroxyl group, as one of the main impurities of CVD synthetic silica glass, affects glass structure and performance. IR absorption spectra of CVD synthetic silica glass prepared with different carrier gases, H2 and O2, shows different hydroxyl group distribution, it indicates that carrier gas has an important influence on hydroxyl group distribution. Combined the MAS-NMR testing results with the distribution results, the function of homogenization process has been discussed. The results indicate that: hydroxyl group distribution presents a parabolic figure when H2 is the carrier gas, while when O2 is the carrier gas, the distribution presents an inverse parabolic figure; During homogenization process, different structures of hydroxyl group acting with each other, leading to an average distribution of hydroxyl group.
The Effects of Surface Treatments, Compression Speeds and Sample Sizes on Compression Load and Strength of Foam Glass
Authors: Zeng Chun Yan , Zhang Jin Cheng , Zhang Gui Hong , Wu Wei , Guo Hong Bin , Shang Qing Yi
Published: January 2017

Foam glass, a kind of light-weight high-strength green energy-saving building materials, has the characteristics of excellent stable insulation, sound absorption, moisture-proof and fire prevention. In this paper, the compression load and strength of the foam glass samples was discussed, with the surface treatments of being coated with emulsified asphalt and kraft paper or nothing on the two pressure receiving surfaces, with the compression speeds of 2200 N/s, 10 mm/min or 0.1 d/min (d represents the thickness), with the sample sizes of 100mm×100mm×50mm or 200mm×200mm×50mm, respectively. The results showed that the surface treatments had a great influence on the compression load and strength, then the compression speeds and sample sizes had little effect on compression load and strength. The samples coated with emulsified asphalt and kraft paper on the two pressure receiving surfaces displayed significant broken yield points at the end of tests.
Effects of Matrix Densification Based on Particle Packing on Lightweight Al2O3-MgO Castables
Authors: Zou Yang , Gu Hua Zhi , Huang Ao , Zhang Min Tao , Zhang Mei Jie
Published: January 2017

The property of refractory matrix was dominated by both the maineral composition and particle packing behaviors. In this study, the theoretical packing density of refractory castables was calculated to design the particle size distribution (PSD) of its matrix. Four lightweight Al2O3-MgO castables with different matrix PSD (represented by q-value) were prepared and examined. Results show that a suitable q-value was needed to ensure acceptable properties including sintering characteristics, strength and slag resistance, which deteriorated distinctly at high q ( > 0.31). For the sample with q = 0.28, the matrix showed dense and uniform mirostructure, and the properties of castable reached a favorable compromise among sintering characteristics (apparent porosity = 14.8%, bulk density = 3.02g∙cm-3, permanent linear change < 0.6%), strength (cold modulus of rapture = 12.4MPa, cold crashing strength=155.5MPa), and resistance against both slag corrosion (Ic = 22.4%) and penetration (Ip = 11.5%). The sample with q = 0.25 showed the highest strength and resistance against slag corrosion, but its slag penetration resistance was lower due to the existence of cracks between aggregates and matrix.
Research Progress of Plugging Agent in Construction Engineering
Authors: Wang Li Min , Sun Zhen Ping , Yang Xu , Shui Liang Liang , Yang Hai Jing , Zhu Wen Xian
Published: January 2017

Leakage is a persistent problem in buildings and some other structures, such as dam, bridge and water tower. For a long time, kinds of plugging agents have been developed successfully by modifying organic or inorganic materials. In this paper, the definition, classification and mechanism of plugging agent were introduced and explored in detail. Besides, some application principles and noteworthy matters in engineering were analyzed at well. Furthermore, based on the development of the construction industry in China, some viewpoints of the development prospects of plugging agent were proposed at last.
Primal Study on Mechanical Properties of Phosphate Based Geopolymer
Authors: Ding Zhu , Lu Can , Cui Peng , Xu Wei Ting
Published: January 2017

A novel inorganic matrix for fiber composites prepared from phosphate based geopolymer (PBG) was synthesized at ambient temperature. The mechanical property of PBG paste and the carbon fiber reinforced PBG composite was determined. Test results showed that the compressive strength of PBG paste at the age of 28 days was found to be 33.67 MPa. Moreover, the carbon fiber sheets enhanced the bending strength and ductility of PBG paste by up to 1300% and 307% respectively. Finally, the strengthening effect of this new composite on concrete beam was evaluated. The carbon fiber PBG composite applied on the bottom surface of concrete beam increased the bending strength by 183%. Therefore, it is concluded that PBG can be a promising inorganic matrix that can be used to strengthen deteriorated concrete structures.
Polymer-Modified Cement Waterproofing Coating and Cementitious Capillary Crystalline Waterproofing Materials: Mechanism and Applications
Authors: Yu Yuan , Sun Tao
Published: January 2017

As the Integrant Construction Material for Infrastructure Construction and Real Estate Industry, Building Waterproof Materials is a Key Part of the Construction Quality Guarantee. it Plays an Important Role in Saving Energy, Reducing Consumption and Environmental Protection. it Lays the Foundation for the Realization of the Cleaning Production and High Efficiency for Economical Production. Currently, the Direction of Waterproof Construction is from Multi-Layer to Single Layer, from Heat to Cold Construction. there are many Different Kinds of Waterproof Materials on Building Materials Market. when the Waterproof Materials Need to Be Used for the Project, we should Deal with Problems Case by Case in Order to Be Able to Select the Waterproof Coating Suitable for the Characteristics of the Project. Attention Need to Be Paid for the Differences of the Constituents, the Physical Mechanical Properties and Characteristics, and Construction Points and Matters during Construction Works Polymer-Modified Cement Waterproofing Coating and Cementitious Capillary Crystalline Waterproofing Materials are Reviewed in the Present Study. Waterproof Mechanism and Influence Factors of its Application Discussed. as a New Type of Waterproof Materials, its Unique Advantage and Price Decline, it has been Widely Used in Industrial and Civil Buildings, and the Remarkable Economic Benefits and Social Benefits has been Achieved in Past few Years.
Study on the Influence of Stone Dust on Adaptability of Polycarboxylate Superplasticizer and Cement
Authors: Jiang Yu Chuan , Wang Yang , Huo Da , Xu Jin E , Yan Hao Chun
Published: January 2017

This paper studies the influence of stone dust on adaptability of polycarboxylate superplasticizer and cement by the experiment of paste slump and mortar slump flow. The results indicate that polycarboxylate superplasticizer mixed in mortar increases with stone dust mixed because of large specific surface and water demand of stone dust. There is little effect on fluidity loss when the dosage of stone dust is below 18%, and it will increase significantly with the dosage more than 18%. The adaptability of polycarboxylate superplasticizer and cement will be bad when the content of stone dust in manufactured sand is over 10%. The adaptability of polycarboxylate superplasticizer and cement can be evaluated by the method of mortar slump flow.