Determination of Standard Molar Enthalpies of Formation of Complexes of Rare Earth Bromides with Glycine

ＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＳｔａｎｄａｒｄＭｏｌａｒＥｎｔｈａｌｐｉｅｓｏｆＦｏｒｍａｔｉｏｎｏｆＣｏｍｐｌｅｘｅｓｏｆＲａｒｅＥａｒｔｈＢｒｏｍｉｄｅｓｗｉｔｈＧｌｙｃｉｎｅＳｕｎＴｏｎｇｓｈａｎ（孙同山），ＷａｎｇＦｅｎｇｌｉａｎ（王凤廉），...     

Determination of Crystal Structure of Britholite-Y

ＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＢｒｉｔｈｏｌｉｔｅ－ＹＺｈａｎｇＪｉａｎ－Ｈｏｎｇ；（张建洪）；ＦａｎｇＺｅ；（方泽）；ＬｉａｏＬｉ－Ｂｉｎｇ；（廖立兵）（ＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＧｅｏｓｃｉｅｎｃｅｓ，...     

Standard Enthalpies of Formation of Solid Complexes of Lanthanide Nitrates with Alanine

Ｇｒｅａｔｉｎｔｅｒｅｓｔｈａｓｂｅｅｎａｒｏｕｓｅｄｉｎｔｈｅｓｔｕｄｙｏｆｃｏｍｐｌｅｘｅｓｏｆｒａｒｅｅａｒｔｈｓａｌｔｓｗｉｔｈａｍｉｎｏａｃｉｄｓｂｅｃａｕｓｅｒａｒｅｅａｒｔｈｉｏｎｓｐｏｓｓｅｓｓｓｏｍｅｓｐｅｃｉａｌｆｕｎｃｔｉｏｎｓｉｎｂｉｏｃｈｅｍｉｓｔｒｙ .Ｔｈｅｙｃａｎｂｅｕｓｅｄａｓａｐｒｏｂｅｔｏｌａｂｅｌｔｈｅｃａｌｃｉｕｍｉｏｎ .Ｍｏｒｅｏｖｅｒ,ａｍｉｎｏａｃｉｄｓａｒｅｔｈｅｓｔｒｕｃｔｕｒｅｕｎｉｔｏｆｐｒｏｔｅｉｎｓ .Ｇａｏａｎｄｃｏｗｏｒｋｅｒｓｒｅｃｅ…     

of tend

on transplant are as follows: autologous tendon, allogeneic tendon, artificial tendon and tissue engineered tendon. Recently, studies on allogeneic tendon are more and more favorable. In late 1980s, establishment and development of tissue engineering bring a new way for repairing de     

Investigation of Crystallization Incorporation of Er-implanted Silicon

ＩｎｖｅｓｔｉｇａｔｉｏｎｏｆＣｒｙｓｔａｌｌｉｚａｔｉｏｎＩｎｃｏｒｐｏｒａｔｉｏｎｏｆＥｒ－ｉｍｐｌａｎｔｅｄＳｉｌｉｃｏｎＷａｎＹａ（万亚）；ＬｉＤａｉｑｉｎｇ（李岱青）（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＹａｎｔａｉＴｅａｃｈｅｒｓ...     

Analysis of the Specific Features of Wear of the Working Rolls of the Finishing Group of Stands Under Conditions of the 1950 Mill at the Casting-Rolling Complex of the “VMZ” JSC

Metallurgist - We present the analysis of the mechanism of in-service wear of the working rolls of wide-band rolling mills on an example of a 1950 mill from the casting-rolling complex of the...     

Effect of Morphology of Instantaneous Inoculant on Inoculated Result of Melted Iron

In 192 2 ,AmericanMeehanappliedthefirstpatentforinoculatedcastiron .Nowtherearemorethan 10 0 0kindsofinoculantsintheworld .Thein oculationmeansthatsomematerialisputintomeltedirontocausesome physicalandchemicalchangeswhicharedifferentfromthosecausedbythealloyingelementinthecastiron .Intheearlydays ,themaincontentofinoculantwassilicon ,andsoonafterwardscalcium ,aluminium ,barium ,strontiumandmanga nese ,etcwereincluded .In 196 1,ceriumwasintro ducedintoinoculant .Nowtheinoculantsarewidelyappli…     

Prediction of Heat of Fusion of Rare Earth Compounds from Binary Phase Diagrams

Based on the thermodynamical principle the new formula for calculation of heat of fusion and its error havebeen derived from binary phase diagrams which could be classified to eutectic,solid solution,degenerate eutecticand involving a compound phase diagram and so on.Using these formulae heats of fusion of some rare earth ox-ides have been predicted.     

Influence of Light Rare Earth on Toughness of Welded Seam of LAHS Steel

The influence mechanism of light rare earth elements, which are transited to the welding seam of low-alloy high strength (LAHS) steel through the covering of the electrode, on the toughness of the welding seam was studied. The experimental results show that proper amount of rare earth elements can desulfurate, dehydrogenate, reduce inclusions and purify the structure of the welding seam. Rare earth element additions have .the effect on welding seam and, at the same time, the transformation of side-batten ferrite is resisted while the pin-ferrite structure is promoted. The improvement of the toughness of the welding seam is due to the purifying action of rare earth elements as well as their refining effect on the structure. However, the toughness of the welding seam can decrease when the amount of light rare earth elements are added excessively because the crystal grains become coarser, porosities appear and the inclusions increase as well. The experimental results show that the suitable amount of light rare earth element additions is about 2%.     

The Characteristics of Adsorption and Desorption of Rare Earth Elements by the Main Types of Soils of China

The adsorption-desorption behavior of the mixed rare earth elements(RE)on the main types ofsoils of China,kaolinite and synthetic oxides was studied.The isothermal adsorption of RE was fitted toLangmuir.Freundlich and Temkin equations.The main factors determining the RE adsorption capacity ofthe soils are the type of clay mineral and the content of amorphous iron oxide in the soils.The above two fac-tors and the pH of soil determine the RE adsorption ability of the soils.The soil and synthetic iron,manga-nese oxides strongly adsorb RE specifically.     

Kinetics and mechanism of oxidation of β-sialons

Conclusions We examined the behavior of two materials during high-temperature oxidation: the singlephase -sialon and the material based on -sialon containing up to 8% residual -Si₃N₄ and the glass phase produced by reaction sintering of the charge based on -modification of silicon nitride. The results show that the maximum oxidation resistance in the temperature range 800–1300°C is exhibited by the single-phase -sialon Si_5.5Al_0.5O_0.5N_7.5. The oxidation resistance decreases in the presence of the residual -Si₃N₄ and the glass phase in the material. The oxidation kinetics are also determined by the structure and composition of the oxide film. The kinetic curves are governed by a parabolic law which indicates that oxidation of the sialons is limited by the diffusion processes. No marked changes were detected in the lattice spacing of the sialon after oxidation.Translated from Poroshkovaya Metallurgiya, No. 6(306), pp. 69–73, June, 1988.     

Effect of Cerium on the Viscosity of Liquid Fe-C Alloy of Eutectic Content

The viscosities of liquid Fe-4.30C and Fe-4.30C-Ce alloys were measured by oscillating crucible viscometer. The results show that viscosity of Fe-4.30C alloy changes from 5.50 to 8.30 MPa~s when the liquid is cooled from 1425℃ to the melting point. The abnormity of viscosity of Fe-4.30C alloy near the melting point is reasonable due to the formation of graphite. The addition of cerium especially with content higher than 0.21% causes an evidently decrease in viscosity for eutectic alloy resulting from increase of free volume and size decrease of atom cluster in the liquids. It can be concended that the existence of C-Ce compound contributes to the discontinuous of viscosity at 1340 ～ 1370 ℃ for the Fe-4.30C-Ce alloy by experinments with differential scanning calorimeter.     

Effect of Cerium on Microstructures of Hard Alloys

Microstructures and crack extending characteristic of the YG8R,YT5R and YT14R hard alloysadding a trace cerium were studied by AEM and HVEM with a tensile holder.In the hard alloys addingcerium,the compounds of Ce_2O_3 or Ce_2O_2S could be formed,extending of stacking faults and transforma-tion from fcc Co to hcp Co were suppressed,volume fraction of fcc Co in the alloys was increased,andstrength of Co and(TiW)C phases and grain boundaries were raised.Plastic deformation in Co phase nearedges of the tensile cracks was more strong,and the tensile cracks could pass through some smaller WCgrains.     

Application of Annexation Principle in Investigation of Thermodynamic Property of Ternary Metallic Melt Fe-Cr-Ni

Ｆｅ Ｃｒ Ｎｉｍｅｌｔｓａｒｅｔｈｅｋｅｙｍｅｌｔｓｆｏｒｓｔａｉｎｌｅｓｓｓｔｅｅｌｐｒｏｄｕｃｔｉｏｎ .Ｉｎ ｐａｃｅｗｉｔｈｓｔｅａｄｙ ｇｒｏｗｔｈｏｆｇｌｏｂａｌｓｔａｉｎｌｅｓｓｓｔｅｅｌｐｒｏｄｕｃｔｉｏｎｆｒｏｍ 2 15ｍｉｌｌｉｏｎｔｏｎｓｉｎｔｈｅｙｅａｒ 196 0ｔｏ 17ｍｉｌｌｉｏｎｔｏｎｓｉｎｔｈｅｙｅａｒ2 0 0 0 [1,2 ] ,ｍｅｔａｌｌｕｒｇｉｓｔｓｎｏｔｏｎｌｙｈａｖｅｄｅｖｏｔｅｄｔｈｅｍ ｓｅｌｖｅｓｔｏｉｍｐｒｏｖｅｔｈｅｑｕａｌｉｔｙａｎｄｒｅｄｕｃｅｔｈｅｃｏｓｔｏｆｓ…     

Study of Properties of Intermetallic Compounds of Rare Earth Metals by Artificial Neural Networks

ＹａｎＬｕ－Ｍｉｎｇ；（严六明）；ＺｈａｎＱｉａｎ－Ｂａｏ；（詹千宝）；ＱｉｎＰｅｉ；（钦佩）；ＣｈｅｎＮｉａｎ－Ｙｉ；（陈念贻）（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｌｕｒｇｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｓｈａｎｇｈａｉ２０００５０...     

Can we improve the prevention of tuberculosis? Analysis of the application of chemoprophylaxis

Social ethics of affirmative postmodernists are discussed in relation to recent German health care legislation. It could be shown that: 1. the health care legislation 1989 and 1993 only partially fulfills the postmodern call for "cultivation of individual responsibility", 2. both laws largely fail to enforce the principle of subsidiarity, and 3. postmodernist thinking is weak on the question of global strategies but strong In the area of individualism and subjectivity. We conclude that postmodern social ethics are useful to compensate areas largely neglected by recent German health care legislation, rather than that the legislation is an example of postmodern social ethics.     

Computer Simulation of Effect of Intergrain Exchange Interaction on Magnetic Properties of Nanocomposite Magnets

Nanocompositemagnetsareoneofcandidatesformagnetsinthenextgeneration .Inananocompositemagnet,theexistenceofmagneticallysoftgrainswithahighsaturationmagnetizationenhancestherema nence,andconsequentlyahigh (BH ) max valueisachieved[1] .Asthemagnetizationinthesoftgrainsispreventedfromtheirreversalbytheintergrainex changeinteractionbetweensoftandhardgrains ,theintergrainexchangeinteractionplaysanimportantroleindeterminingmagneticproperties .Therefore ,itscontrolisconsideredtobeakeytechnologyforobt…