Materials Literature
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Abstract The melting of alkali halides occurs probably at a critical mole fraction x c = 3.2 · 10 −4 of thermally created vacancies (Schottky defects). Using this value the formation entropy of Schottky defects is found to be s S = (962.1 K mol/kJ L/ T m – 16.1) k ( L, T m heat and temperature of fusion, respectively)…
With the aid of a derivative spectrophotometer, emission characteristics of formaldehyde from a methanol fueled S. I. engine were obtained. Formaldehyde and unburned methanol were measured at several distances along the exhaust tube for various air-fuel equivalence ratios and ignition timings. Experiments show that do…
The thermal-shock behavior of ZrO2-CaO and ZrO2-MgO pellets was investigated by immersing these pellets into liquid iron without preheating temperature or with preheating temperature. The moduli of rupture before and after the thermal-shock were measured by a three point bending technique. A good thermal-shock resista…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation William T. Brown; Numerical modeling of oblique hypervelocity impact using two‐dimensional plane…
A simple and rapid complexometric method for stepwise titration of calcium and magnesium, when present in unfavourable ratios, has been successfully worked out. The method is based on the direct titration of calcium of pH 12 with EDTA, using thymolphthaleincalcein indicator. The adsorption of metallochromic indicator…
Abstract Zirconium dioxide, prepared by thermal decomposition of zirconium nitrate, was heated in air at temperatures ranging from 573 to 1023 K. An analysis of nitrogen adsorption‐desorption isotherms on the resulting materials allowed determination of the corresponding specific surface area and porous texture. All o…
The niobium-tin system was investigated in the temperature range 1261-2076 K by measurement of tin vapor pressures with a simultaneous weight loss-mass-spectrometric technique. For the reaction Nb + 1/3Sn ..-->.. NbSn/sub 1///sub 3/, ..delta..H/sub f//sup 298/ was found to be -21.59 kJ/mol. The heat of solution of tin…
Fe-25Cr-7Ni-3Mo(A)およびFe-23Cr-6Ni(B)の2種類の二相ステンレス鋼を用いてσ相析出挙動におよぼす種々の因子の影響を調べ,以下の結果を得た.(1)B鋼はA鋼に比し,σ相の析出に2桁以上長い時間を要した.σ相の析出が非常に速いA鋼との差は,化学組成,特にσ相とγ相に相分離することが知られているσ相の化学組成の差に起因すると思われる.(2)冷間加工のみならず熱聞加工あるいは焼入歪みもσ相の析出を促進することがわかつた.中でも冷間加工による促進効果は顕著であり,α粒内での析出に加えてγ粒内でもσ相の析出が認められ,従来知られているα→σ+γの反応に加えてγ→σの反応も存在することが認められた.このような内部歪…
Presentamos aqui un catalogo de las Diatomeas espanolas no marinas citadas hasta Julio de 1981. Se mencionan 738 taxones.
In the physically stressful environment there are three major ways in which a material can respond to external forces. It can add the load directly on to the forces which hold the constituent atoms or molecules together. This occurs in simple crystalline (including polymeric crystalline) and ceramic materials, and suc…
ABSTRACT TWO fracture parameters were determined for corn horny endosperm as influenced by moisture content and temperature. Kernels were cut into beam-shaped speciments and stressed in simple 3-point loading. Stress concentrations were varied by placing notches of several depths at the center of the tension side. Fra…
Free-standing films of polyacetylene have been oxidized with Fe(ClO4)3 to yield materials exhibiting high electrical conductivity thus providing an alternative route to the electrochemical p-doping with perchlorate anion.
Zircaloy cladding chemical reactions with coolant water and UO2 fuel at elevated temperatures under a reactivity initiated accident (RIA) condition were studied from a metallurgical point of view on the basis of the nuclear safety research reactor (NSRR) experiments. The cladding-fuel chemical reaction was extensively…
Laboratory scale demonstrations have shown that cotton fabrics and battings that were treated with boric acid had excellent smolder resistance in upholstery composites when exposed to cigarette ignition. The results presented in this paper illustrate a reduction to practice using trimethylborate vapor as a chemical pr…
Benavidesite, Pb4(Mn, Fe)Sb6S14 with Mn > Fe, is a new mineral which belongs to the jamesonite serie. It has been simultanously discovered in Uchucchacua (Peru) and in Sàtra (Sweden). Benavidesite is monoclinic, probable space group is P21/a with a = 15.74, b = 19.14, c = 4.06 Â, P = 91.5°, Z = 2, dcalc = 5.60. Mai…
Abstract An electron microscope observation was made on the binary Sm‐Co alloy. One‐dimensional lattice images of Sm 5 Co 19 taken with the incident beam parallel to the [010] and [110] directions of the hexagonal axis showed many stacking faults. The intergrowth with the Sm 2 Co 7 phase was observed in the matrix of…
The soil has mechanisms which serve as buffers or ionic reservoirs which remove nutrient ions from and return them to the soil solution and thus regulate their availabilities to higher plants. Yet relative amounts of each type of cation‐exchange bond are evidently so different from soil to soil that basic cation satur…
Modern railway transportation, progressing towards ever higher speeds, higher axle loads and greater traffic volumes, places high demands on rail steel. The rails should have a high resistance to wear and fatigue, be weldable, and display safety against fracture.Steel producers have met these requirements with the hel…
A new electrovac with λ type D solution and with both Debever–Penrose vectors aligned along the real eigenvectors of the electromagnetic field is presented. The principal null directions are shearing and twisting. The existence of this solution, endowed with an O(2,1,R) symmetry, requires λ<0.
The removal of methyl iodide by adsorption onto silver mordenite was studied using a simulated off-gas from the fuel dissolution step of a nuclear fuel reprocessing plant. The methyl iodide adsorption of partially exchanged silver mordenite was examined for the effects of NO/sub x/, humidity, filter temperature, and d…