A geometric determination of the Weyl canonical frame in petrov type-I space-times

1989 ◽  
Vol 21 (9) ◽  
pp. 953-957 ◽  
Author(s):  
S. Bonanos
Keyword(s):  
Petrov Type ◽  
Type I ◽  
Canonical Frame

scholarly journals A covariant determination of the Weyl canonical frames in Petrov type I spacetimes

1997 ◽  
Vol 14 (1) ◽  
pp. 129-138 ◽  
Author(s):  
Joan Josep Ferrando ◽  
Juan Antonio Sáez
Keyword(s):  
Petrov Type ◽  
Type I

THE POST-BIANCHI IDENTITIES IN THE GHP FORMALISM

1996 ◽  
Vol 05 (04) ◽  
pp. 407-418
Author(s):  
GARRY LUDWIG
Keyword(s):  
Petrov Type ◽  
Type I ◽  
Bianchi Identities ◽  
Canonical Frame ◽  
Integrability Conditions ◽  
Ghp Formalism ◽  
Vacuum Solutions

As is well-known, when searching for Petrov type I vacuum solutions the imposition of tetrad conditions leads to integrability conditions on the Bianchi identities. Such post-Bianchi equations are simplest in GHP. They are exhibited explicitly for both a “canonical” frame and an “aligned” frame. Choosing a particular gauge, however, complicates the situation considerably; many more conditions are obtained. When this is done for the “canonical” case the resulting equations, when translated to NP, are the Brans-Edgar equations. How all such equations can be checked is reviewed in some detail.

Partial dissociation of nitrogen aggregates in diamond by high temperature-high pressure treatments

1978 ◽  
Vol 361 (1704) ◽  
pp. 109-127 ◽  
Keyword(s):  
General Relation ◽  
Infrared Region ◽  
Optical Measurements ◽  
Type I ◽  
Paramagnetic Resonance ◽  
High Concentrations ◽  
Partial Dissociation ◽  
Almost All ◽  
Electron Paramagnetic

Type I (a) diamonds contain high concentrations of nitrogen, almost all of which is in an aggregated form. The two main aggregates are recognized by characteristic absorption features in the infrared region of the spectrum. These are called A and B features; usually a peak designated B' is also present. When such diamonds were heated at 1960 °C and above under a stabilizing pressure of 85kbar (8.5 GPa) the nitrogen aggregates partially dissociated, producing single substitutional atoms which were identified by electron paramagnetic resonance (e.p.r.) measurements. Experiments with selected diamonds, showing wide variations in their characteristic infrared absorption, determined the relative stability of the A and B centres. Optical measurements led to the determination of a general relation between the strengths of the A, B and B' features. The experimental observations suggest a scheme for the occurrence of type I (a) diamonds containing nitrogen atoms which have aggregated into A centres; type I (b) diamonds can also be included in this scheme.

A Literature Study of IPQC (In Process Quality Control) tests and FDF (Finished Dosage Form) tests for Parenteral Dosage forms taking Adicovil IV Ampoule as an Example.

2017 ◽  
Vol II (I) ◽  
pp. 44-55
Author(s):  
Ayesha Sabir ◽  
Syeda Komal Fatima ◽  
Asma Kaleem ◽  
Sidra Altaf ◽  
Imran Khan
Keyword(s):  
Quality Control ◽  
Dosage Form ◽  
Small Volume ◽  
Volatile Matter ◽  
Process Quality ◽  
Type I ◽  
Literature Study ◽  
Physical Tests ◽  
Parenteral Product

This study was conducted to evaluate both the in-process quality control tests as well as the finished dosage form tests for a parenteral product. Furthermore, all the processes from the purchase of API to marketing of product were studied. A batch of Adicovil was taken Adicovil was taken as an example, it is small volume parenteral of 2ml ampoule that is studied to evaluate its efficacy and stability by performing chemical and physical tests. IPQC tests for type I glass includes powder glass test, while for water for injection they are pH, acidity & alkalinity, non-volatile matter, ammonium ions, non-oxidizable matter, sterility and pyrogen test. Test for finished dosage form of Adicovil are identification, leaker test, clarity test, sterility, pyrogen test, BET, deliverable volume and determination of volume of injection for container. The selected batch of Adicovil passed all the IPQC and FDF tests in the procedure.

Determination of the Probability Plotting Position for Type I Extreme Value Distribution

2012 ◽  
Vol 12 (14) ◽  
pp. 1501-1506 ◽  
Author(s):  
Ahmad Shukri Yah ◽  
Norlida Md. Nor ◽  
Nor Rohashikin ◽  
Nor Azam Ramli ◽  
Fauziah Ahmad ◽  
...  
Keyword(s):  
Extreme Value Distribution ◽  
Extreme Value ◽  
Value Distribution ◽  
Type I

scholarly journals DETERMINATION OF CROSS SECTIONS FOR GRAVITY TYPE QUAY WALLS

2017 ◽  
pp. 5
Author(s):  
Tugce Yuksel ◽  
Yalcin Yuksel ◽  
Busra Basaran ◽  
Esin Cevik
Keyword(s):  
Cross Sections ◽  
Vertical Wall ◽  
Block Size ◽  
Seismic Loading ◽  
Block Type ◽  
Type I ◽  
Type Ii ◽  
Seismic Loadings ◽  
Port Structures

Block type quay walls are widely used as port structures in the world. In this study three types of vertical block type quay walls with different block size exposed to seismic loading were investigated experimentally. The block ratios of Type I, Type II and III vertical wall models are B/h=2, 1.5 and 1.5 & H/h=6, 6 and 3, respectively. The tests were conducted in the shaking tank with different harmonic seismic loadings and the behaviors of these walls were investigated comparatively.

The Determination of Macrostresses (Type-I Stresses) and Microstresses (Type-Ii Stresses) by Neutron Diffraction

1994 ◽  
Vol 376 ◽  
Author(s):  
T.M. Holden
Keyword(s):  
Neutron Diffraction ◽  
Experimental Methods ◽  
Stress Fields ◽  
Type I ◽  
Type Ii ◽  
Sources Of Error ◽  
Precision And Accuracy

ABSTRACTNeutron diffraction has been used as tool for measuring stress fields (type-I stresses) and intergranular or microstresses (type-II stresses) for a decade. The experimental methods for measuring the two types of stresses are outlined. Emphasis is placed on maximizing the precision and accuracy of the measurements. Some serious sources of error in measurements near surfaces and some subtle wavelength effects are considered.

Structural determination of d-mannans of pathogenic yeasts Candida stellatoidea type I strains: TIMM 0310 and ATCC 11006 compared to IFO 1397

1991 ◽  
Vol 214 (1) ◽  
pp. 131-145 ◽  
Author(s):  
Hidemitsu Kobayashi ◽  
Takeshi Kojimahara ◽  
Kaori Takahashi ◽  
Masashi Takikawa ◽  
Shin-ichi Takahashi ◽  
...  
Keyword(s):  
Type I ◽  
Structural Determination

The role of shocks in the determination of empirical abundances for type-I PNe

2018 ◽  
Vol 14 (S343) ◽  
pp. 377-378
Author(s):  
Roberto D. D. Costa ◽  
Paulo J. A. Lago
Keyword(s):  
Planetary Nebulae ◽  
Type I ◽  
Correction Factors ◽  
Chemical Abundances

AbstractWe investigate, in the light of new diagnostic diagrams, the role of shocks in the ionization profile of type-I planetary nebulae, and their relation to the empirical derivation of chemical abundances. We apply our technique to two well-known type-I objects: NGC 2440 and NGC 6302. Our results indicate that shocks play a very important role in the spectra of both nebulae and, since the presence of shocks reinforces the flux of low ionization lines, this artificial reinforcement can lead to incorrect chemical abundances, when they are derived through Ionization Correction Factors, at least for type-I PNe.

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