共查询到20条相似文献,搜索用时 31 毫秒
1.
DeterminationofStandardMolarEnthalpiesofFormationofComplexesofRareEarthBromideswithGlycineSunTongshan(孙同山),WangFenglian(王凤廉),... 相似文献
2.
DeterminationofCrystalStructureofBritholite-YZhangJian-Hong;(张建洪);FangZe;(方泽);LiaoLi-Bing;(廖立兵)(ChinaUniversityofGeosciences,... 相似文献
3.
Greatinteresthasbeenarousedinthestudyofcomplexesofrareearthsaltswithaminoacidsbecauserareearthionspossesssomespecialfunctionsinbiochemistry .Theycanbeusedasaprobetolabelthecalciumion .Moreover,aminoacidsarethestructureunitofproteins .Gaoandcoworkersrece… 相似文献
4.
《铁合金》2007,(4)
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 相似文献
5.
SHENG Da 《钢铁研究学报(英文版)》2003,10(4)
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… 相似文献
6.
Muntin A. V. Sevidov A. E. Tikhonov S. M. Ionov S. M. Zinoviev A. V. Labyshkina T. A. 《Metallurgist》2021,65(3-4):305-313
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... 相似文献
7.
InvestigationofCrystallizationIncorporationofEr-implantedSiliconWanYa(万亚);LiDaiqing(李岱青)(DepartmentofChemistry,YantaiTeachers... 相似文献
8.
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. 相似文献
9.
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%. 相似文献
10.
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. 相似文献
11.
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. 相似文献
12.
Metallurgist - We present the results of industrial testing of the technology of processing of silver–zinc crust obtained in the process of refining of raw lead from silver in a... 相似文献
13.
V. A. Gunchenko V. N. Pavlikov G. V. Trunov 《Powder Metallurgy and Metal Ceramics》1988,27(6):470-474
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 Si5.5Al0.5O0.5N7.5. 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. 相似文献
14.
15.
At present, in cast iron fine melting, lowering phosphorus concentration with no loss ofother favorable elements at the same timeseems to be a problem, which still has notbeen solved thoroughly. Therefore, looking foran appropriate nodulizer to modify the morphology of phosphide eutectic, especially inhigh strength cast iron, is necessary. On theother hand, phosphorous can also exhibit itsfaVorable effect on mechanical properties aswell as processing behaviors. For instance,gray cast iron cont… 相似文献
16.
Due to the ferro-philic and rock-philic geochemical properties, dispersion of resources as well as itscomplicated composition, the properties of scandium are similar to those of the lanthanide. Hence, its separa-tion from the lanthanides and iron is an important subject which has been studied extensively.1,10-bis(1'-phenyl-3'-methyl-5'-oxopyrazole-4'-yl)decane-1, 10-dione(BPMDD, H_2A)is a β-diketone chelating agent, and has a strong extracting power. The extraction of Sc with this chelating agenthas not been reported so far~([1]). In this communication, we attempt to separate scandium from the lanthanidesand some other elements by the extraction with BPMDD under suitable conditions. 相似文献
17.
18.
19.
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. 相似文献
20.
Nanocompositemagnetsareoneofcandidatesformagnetsinthenextgeneration .Inananocompositemagnet,theexistenceofmagneticallysoftgrainswithahighsaturationmagnetizationenhancestherema nence,andconsequentlyahigh (BH ) max valueisachieved[1] .Asthemagnetizationinthesoftgrainsispreventedfromtheirreversalbytheintergrainex changeinteractionbetweensoftandhardgrains ,theintergrainexchangeinteractionplaysanimportantroleindeterminingmagneticproperties .Therefore ,itscontrolisconsideredtobeakeytechnologyforobt… 相似文献