Catálogo de las algas continentales españolas, I: Diatomophyceae
Presentamos aqui un catalogo de las Diatomeas espanolas no marinas citadas hasta Julio de 1981. Se mencionan 738 taxones.
Materials Literature
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Basic Theory of Elasticity and Viscoelasticity
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…
Fracture of Corn Endosperm in Bending Part I. Fracture Parameters
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…
Iron(III) perchlorate doping of polyacetylene
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-UO2 and -water reactions and cladding temperature estimation for rapidly-heated fuel rods under an RIA condition.
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…
Fire Retardance Treatment of Fabrics for the 80s: Smolder Resistant Cotton Treated with Boric Acid
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…
La bénavidésite, Pb4(Mn, Fe)Sb6S14, un nouveau minéral de la série de la jamesonite
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…
Intergrowth and stacking faults in the Sm5Co19 Phase
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…
Chemical equilibrations with soil buffer systems as bases for future soil testing programs
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 Development in Rail Steel Metallurgy and Production
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…
An exceptional type D shearing twisting electrovac with λ
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.
Organic iodine removal from simulated dissolver off-gas streams using partially exchanged silver mordenite
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…
The crystal structure of rebulite, Tl5Sb5As8S22
The crystal structure of a new sulfosalt, Tl 5 Sb 5 As 8 S 22 , has been determined. The crystal is monoclinic with space group P 2 1 / c . Four formula units are contained in a unit cell of dimensions a 0 = 17.441(5), b 0 = 7.363(2) and c 0 = 32.052(7) Å, β = 105.03(7)°. The structure was determined by direct methods…
The derivative structure of silicate garnets in grandite
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A New Low-Carbon 16Cr-5Ni Stainless Martensitic Cast Steel
A new low-carbon 16Cr-5Ni stainless martensitic cast steel (S + C 4405) is presented as an advancement of CA6NM with improved corrosion resistance, excellent ductility, less susceptibility to hardening cracks, and good weldability, filling the gap between CA6NM and CF8M. The chemical composition is balanced so that a…
Electrochemical influences in fracture initiation
Dissolution at metal surfaces may be structurally or non-structurally dependent. The effects of grain boundaries, interfaces between discrete phases, non-metallic inclusions, and slip lines in promoting structurally dependent attack are considered in the context of a variety of metal-environment systems. Pitting and f…
I - The emission spectra of tl produced by ion implanted CaF2
Rare earth doping of CaF2 produces material which gives strong thermoluminescence signals. In an attempt to separate the influence of impurity and intrinsic defects CaF2 has been implanted with ions of Ce, Dy, Mn, Ca and F. Comparisons are made with chemically doped samples and the effect of thermal treatments have be…
Studies of phosphazenes. Part 15. Chloro(phenoxy)cyclotetraphosphazenes, N 4 P 4 Cl 8–n (OPh) n
The reaction of N4P4Cl8(1) with sodium phenoxide (or phenol in the presence of triethylamine) has been studied under a variety of experimental conditions. The chloro(phenoxy)-derivatives, N4P4Cl8–n(OPh)n[n= 1 or 2 (mixture of four non-geminal isomers), 3(mixture of non-geminal isomers), 4(mixture of isomers), 5(mixtur…
Properties and applications of metal hydrides in energy conversion systems
Structural, thermodynamic, and kinetic properties and phase diagrams of hydrogen in metals and alloys are presented in relation to materials development for the ‘hydrogen energy technology'. Among the materials considered special attention is paid to the hydrides of Li, Mg, Y, V, Nb, U, TiFe, and LaNi5. It is shown ho…
Electrochromism in evaporated WO3‐MoO3‐V2O5 films
Abstract Symmetric and asymmetric EC cells are here fabricated using amorphous W0 3 ‐Mo0 3 ‐V 2 0 5 films vacuum‐evaporated on substrates prepared in electrolyte of lithium perchlorate and propylene carbonate. Dependences of the reflection spectra of symmetric cells and the transmission spectra of asymmetric cells on…