The pascoite family of minerals, including the redefinition of rakovanite

2021 ◽  
Vol 59 (4) ◽  
pp. 771-779
Author(s):  
Anthony R. Kampf ◽  
John M. Hughes ◽  
Mark A. Cooper ◽  
Frank C. Hawthorne ◽  
Barbara P. Nash ◽  
...  
Keyword(s):  
Mixed Valence ◽  
Mineral Species ◽  
Ideal Formula ◽  
The Ideal

ABSTRACT Mineral species that contain the decavanadate isopolyanion [V10O28]6–, including its protonated and mixed-valence variants, constitute the pascoite family of minerals. Within the pascoite family, the isostructural minerals pascoite and magnesiopascoite form the pascoite group and the isostructural minerals lasalite and ammoniolasalite form the lasalite group. Rakovanite, which was originally assigned the ideal formula Na3[H3V10O28]·15H2O, is redefined with the ideal formula (NH4)3Na3[V10O28]·12H2O.

Coiraite, (Pb,Sn2+)12.5As3Fe2+Sn4+5 S28: a franckeite-type new mineral species from Jujuy Province, NW Argentina

2008 ◽  
Vol 72 (5) ◽  
pp. 1083-1101 ◽  
Author(s):  
W. H. Paar ◽  
Y. Moëlo ◽  
N. N. Mozgova ◽  
N. I. Organova ◽  
C. J. Stanley ◽  
...  
Keyword(s):  
Low Temperature ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Mineral Species ◽  
New Mineral ◽  
Hydrothermal Solutions ◽  
X Ray ◽  
New Mineral Species ◽  
Primary Mineral ◽  
The Ideal

AbstractCoiraite, ideally (Pb,Sn2+)12.5As3Fe2+Sn4+S28, occurs as an economically important tin ore in the large Ag-Sn-Zn polymetallic Pirquitas deposit, Jujuy Province, NW-Argentina. The new mineral species is the As derivative of franckeite and belongs to the cylindrite group of complex Pb sulphosalts with incommensurate composite-layered structures. It is a primary mineral, frequently found in colloform textures, and formed from hydrothermal solutions at low temperature. Associated minerals are franckeite, cylindrite, pyrite-marcasite, as well as minor amounts of hocartite, Ag-rich rhodostannite. arsenopyrite and galena. Laminae of coiraite consist of extremely thin bent platy crystals up to 50 urn long. Electron microprobe analysis (n = 31) gave an empirical formula Pb11.21As2.99Ag0.13Fe1.10Sn6.13S28.0 close to the ideal formula (Pb11.3Sn2+1.2)Σ=12.5As3Fe2+Sn4+S28. Coiraite has two monoclinic sub-cells, Q (pseudotetragonal) and H (pseudohexagonal). Q: a 5.84(1) Å, b 5.86(1) Å, c 17.32(1) Å, β 94.14(1)°, F 590.05(3) Å3, Z = 4, a:b:c = 0.997:1:2.955; H (orthogonal setting): a 6.28(1) Å, b 3.66(1) Å, c 17.33(1) Å, β 91.46(1)°, V398.01(6) Å3, Z = 2, a∶b∶c = 1.716∶1∶4.735. The strongest Debye-Scherrer camera X-ray powder-diffraction lines [d in Å, (I), (hkl)] are: 5.78, (20), (Q and H 003); 4.34, (40), (Q 004); 3.46, (30), (Q and H 005); 3.339, (20), (Q 104); 2.876, (100), (Q and H 006); 2.068, (60), (Q 220).

UlTRAFAST LATTICE RELAXATION DYNAMICS OF EXCITON IN A QUAISI-1-D METAL-HALOGEN COMPLEX

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3965-3968
Author(s):  
ATSUSHI SUGITA ◽  
TAKASHI SAITO ◽  
TAKAYOSHI KOBAYASHI ◽  
MASAHIRO YAMASHITA
Keyword(s):  
Wave Packet ◽  
Free Exciton ◽  
Mixed Valence ◽  
Lattice Relaxation ◽  
Relaxation Dynamics ◽  
Time Resolved ◽  
Pump And Probe ◽  
Probe Spectroscopy ◽  
Electronic Ground ◽  
The Ideal

A quasi-one-dimensional halogen-bridged mixed-valence metal complex is studied by time-resolved pump and probe spectroscopy with sub-5 fs time resolution. Two kinds of oscillatory signals are observed, which are attributed to the wave packet motions both in an electronic ground state and in a self-trapped exciton (STE) state. The onset of the wave packet motion is found to be delayed by about 50 fs, comparing with the ideal wave packet in the electronic excited state. The delay reflects the thermalization process in a free exciton (FE) state and a lattice relaxation process from FE to STE states.

The ideal formula for healthy term infants

2013 ◽  
Vol 89 ◽  
pp. S126-S128 ◽  
Author(s):  
Gaia Francescato ◽  
Fabio Mosca ◽  
Carlo Agostoni ◽  
Massimo Agosti
Keyword(s):  
Term Infants ◽  
Ideal Formula ◽  
The Ideal

scholarly journals Amount algebras

2021 ◽  
pp. 2250102
Author(s):  
Peyman Nasehpour
Keyword(s):  
Positive Integer ◽  
Valuation Ring ◽  
Prüfer Domain ◽  
Radical Ideal ◽  
Ideal Formula ◽  
Torsion Free ◽  
The Ideal

In this paper, as a generalization to content algebras, we introduce amount algebras. Similar to the Anderson–Badawi [Formula: see text] conjecture, we prove that under some conditions, the formula [Formula: see text] holds for some amount [Formula: see text]-algebras [Formula: see text] and some ideals [Formula: see text] of [Formula: see text], where [Formula: see text] is the smallest positive integer [Formula: see text] that the ideal [Formula: see text] of [Formula: see text] is [Formula: see text]-absorbing. A corollary to the mentioned formula is that if, for example, [Formula: see text] is a Prüfer domain or a torsion-free valuation ring and [Formula: see text] is a radical ideal of [Formula: see text], then [Formula: see text].

On the reduction numbers of monomial ideals

2019 ◽  
Vol 19 (10) ◽  
pp. 2050201
Author(s):  
Ibrahim Al-Ayyoub
Keyword(s):  
Polynomial Ring ◽  
Monomial Ideal ◽  
Upper Bounds ◽  
Integral Closure ◽  
Monomial Ideals ◽  
Explicit Method ◽  
Generating Set ◽  
Ideal Formula ◽  
Reduction Number ◽  
The Ideal

Let [Formula: see text] be a monomial ideal in a polynomial ring with two indeterminates over a field. Assume [Formula: see text] is contained in the integral closure of some ideal that is generated by two elements from the generating set of [Formula: see text]. We produce sharp upper bounds for each of the reduction number and the Ratliff–Rush reduction number of the ideal [Formula: see text]. Under certain hypotheses, we give the exact values of these reduction numbers, and we provide an explicit method for obtaining these sharp upper bounds.

scholarly journals Formulasi dan Evaluasi Sediaan Obat Kumur (Mouthwash) dari Ekstrak Etanol Daun Kalangkala (Litsea angulata) sebagai Antiseptik Mulut

2021 ◽  
Vol 7 (1) ◽  
pp. 248-256
Author(s):  
Rohama Rohama ◽  
Melviani Melviani
Keyword(s):  
Antibacterial Activity ◽  
Streptococcus Mutans ◽  
Physical Stability ◽  
Inhibition Zone ◽  
Diffusion Method ◽  
Physical Quality ◽  
Stability Properties ◽  
Ideal Formula ◽  
The Ideal

Research of mouthwash formulation and evaluation of kalangkala leaves extract (Litsea angulata) as an oral antiseptic also has been tested in Streptococcus mutans bacteria by variation in the concentration of extract 2%, 2,5%, and 3%, which aims to determine the ideal formula in physical quality and has the highest antibacterial activity based on an inhibition zone of Streptococcus mutans bacteria in mouthwash formula. The methods used include the step of extraction of Kalangkala leaves, preparation of mouthwash with 3 formula F1 (2%), F2 (2,5%), and F3 (3%) followed by an evaluation that includes organoleptic, pH test, viscosity test, and the test of inhibition zone bacteria. The test of inhibition zone bacteria used NA media with diffusion method. Stability was performed on weeks 1, 2, 3, and 4. The result showed variation in the concentration of extract kalangkala leaves in a mouthwash formula affects the diameter of the inhibition zone. But did not have a significant effect on the physical stability properties of the mouthwash formula. Mouthwash formula has the highest antibacterial activity based on the inhibition zone of Streptococcus mutans that is 3% contained in formula F3.

A barian bannisterite from Japan

1989 ◽  
Vol 53 (369) ◽  
pp. 85-87 ◽  
Author(s):  
S. Matsubara ◽  
A. Kato
Keyword(s):  
Unit Cell ◽  
Powder Pattern ◽  
Chemical Analyses ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Ideal Formula ◽  
The Ideal

AbstractChemical analyses of bannisterite from the Kamo mine, Toba City, Mie Prefecture, Japan, give Ba : Ca = 69:31–55:45, yielding the ideal formula with Ba > Ca, i.e. (Ba,Ca)(K,H3O)(Mn2+ · Mg,Fe2+)21 (Si,Al)32(O,OH)92 · nH2O, where Ba > Ca, Mn2+ > Mg, Fe2+,Si ≫ Al, and O > OH. The unit cell parameters calculated after the indexing of the X-ray powder pattern are: a = 22.95, b = 16.52, c = 25.66 Å, β = 94.2°. It occurs as dark brown veinlets cutting massive caryopilite-rhodochrosite ore, which is also cut by veinlets of manganoan chlorite (Mn/(Mg + Mn + Fe) = c. 0.30–0.39) with minor barian orthoclase (Ba/(K+ Ba) = 0.05 ∼ 0.06).

Zsigmondy theorem for arithmetic dynamics induced by a drinfeld module

2019 ◽  
Vol 15 (06) ◽  
pp. 1111-1125
Author(s):  
Zhengjun Zhao ◽  
Qingzhong Ji
Keyword(s):  
Prime Ideal ◽  
Function Field ◽  
Drinfeld Module ◽  
Torsion Point ◽  
Arithmetic Dynamics ◽  
Global Function ◽  
Ideal Formula ◽  
Global Function Field ◽  
The Ideal

Let [Formula: see text] be a Drinfeld [Formula: see text]-module defined over a global function field [Formula: see text] Let [Formula: see text] be a non-torsion point of [Formula: see text] with infinite [Formula: see text]-orbit. For each [Formula: see text] write the ideal [Formula: see text] as a quotient of relatively prime integral ideals. We establish an analogue of the classical Zsigmondy theorem for the ideal sequence [Formula: see text] i.e. for all but finitely many [Formula: see text] there exists a prime ideal [Formula: see text] such that [Formula: see text] and [Formula: see text] for all [Formula: see text]

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