An Archaeological Approach to the Study of Cultural Stability

1955 ◽  
Vol 11 ◽  
pp. 32-57 ◽  
Author(s):  
Emil W. Haury ◽  
Robert L. Rands ◽  
Albert C. Spaulding ◽  
Walter W. Taylor ◽  
Raymond H. Thompson ◽  
...  
Keyword(s):  
Stability Problem ◽  
Significant Contribution ◽  
Time Perspective ◽  
Problem Area ◽  
Cultural Development ◽  
Instability Problem ◽  
Long Span ◽  
The Stability ◽  
Definition Of

The study of cultural stability requires a knowledge of cultural development over a reasonably long span of time. The definition of this time perspective is one of the major contributions of archaeology to the study of culture. The archaeologist therefore should be in a position to make a significant contribution to the appraisal of the stability problem itself. However, the lack of a commonly accepted anthropological definition of the concept of cultural stability imposes semantic difficulties which hinder the determination of practical limits for the stability- instability problem area. Moreover, the nature of the data available to the archaeologist conditions the kind of contribution he can make.

scholarly journals Experimental research on mass determination of non-metal weights

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 23
Author(s):  
M. Hu ◽  
J. Wang ◽  
C. Cai ◽  
R. Zhong ◽  
K. Jiao ◽  
...  
Keyword(s):  
Mass Measurement ◽  
Mass Determination ◽  
Measuring Process ◽  
Pm 2.5 ◽  
Metal Material ◽  
Buoyancy Correction ◽  
The Stability ◽  
Definition Of ◽  
Silicon Spheres

With the revision of the definition of the kilogram, more and more weights made of non-metal material, such as silicon spheres and PM 2.5 film, need to be determined with high accuracy. As conventional mass is commonly used in mass metrology, this paper discusses the mass-measuring process for silicon and PM 2.5 film. Electrostatic eliminators are used to eliminate the electrostatic effects of non-metal material to improve the stability of mass measurement. Due to the big difference of weights’ densities, the air buoyancy correction and its uncertainty evaluation are also conducted.

scholarly journals On the possibility of the Dyson spheres observable beyond the infrared spectrum

2018 ◽  
Vol 17 (4) ◽  
pp. 356-360 ◽  
Author(s):  
Z. Osmanov ◽  
V. I. Berezhiani
Keyword(s):  
Melting Point ◽  
Stability Problem ◽  
Optical Spectrum ◽  
Cooling System ◽  
Habitable Zone ◽  
High Melting ◽  
High Melting Point ◽  
Transverse Waves ◽  
The Stability ◽  
Definition Of

AbstractIn this paper, we revisit the Dysonian approach and assume that a superadvanced civilization is capable of building a cosmic megastructure located closer than the habitable zone (HZ). Then such a Dyson Sphere (DS) might be visible in the optical spectrum. We have shown that for typical high melting point metamaterial – Graphene, the radius of the DS should be of the order of 1011 cm, or even less. It has been estimated that energy required to maintain the cooling system inside the DS is much less than the luminosity of a star. By considering the stability problem, we have found that the radiation pressure might stabilize dynamics of the megastructure and as a result it will oscillate, leading to interesting observational features – anomalous variability. The similar variability will occur by means of the transverse waves propagating along the surface of the cosmic megastructure. In the summary, we also discuss the possible generalization of the definition of HZs that might lead to very interesting observational features.

scholarly journals Explicit Commutativity and Stability for the Heun's Linear Time-Varying Differential Systems

2021 ◽  
Author(s):  
Salisu Ibrahim
Keyword(s):  
Differential System ◽  
Stability Problem ◽  
Significant Contribution ◽  
Initial Conditions ◽  
Linear Time ◽  
Time Varying ◽  
Differential Systems ◽  
System Sensitivity ◽  
System Robustness ◽  
The Stability

This paper studies the commutativity and stability for the Heun’s linear time-varying system (LTVS) with both zero and non-zero initial conditions(ICs). Given a LTVS A of order 2 , we find it’s commutative pair, that is a new LTVS B of order m ≤ n . Explicit commutative theories and conditions for second-order LTVSs are derived and solved to simplify and guarantee the equivalency between the connected input-output of systems A B and B A . The explicit results obtained are juxtaposed by simulation in order to investigate the commutativity of Heun’s differential system, sensitivity of Heun’s system, effects due to disturbance on Heun’s system, robustness on Heun’s system and problems regarding the stability of Heun’s system. This findings will help to fill the gap on stability problem, system behaviors, commutativity theory, and general theory for solutions of differential equations, which has significant contribution to science and unlimited application in engineering, our results are verify using Heun’s differential system as well as authenticated by Wolfrom Mathematica 1 1 and Matlab.

The Definition of a Critical Deflection of Compressed Rods with the Creep by the Method of Bubnov-Galerkin

2018 ◽  
Vol 931 ◽  
pp. 127-132
Author(s):  
Batyr M. Yazyev ◽  
Serdar B. Yazyev ◽  
Anatoly P. Grinev ◽  
Elena A. Britikova
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Methods ◽  
Difference Method ◽  
Stability Problem ◽  
The Finite Element Method ◽  
The Difference ◽  
The Stability ◽  
Definition Of ◽  
The Galerkin Method

The comparison of the numerical methods: the finite element method, the Galerkin Method, the difference method is considered for the study of the stability of the rods. The dependence of the solution of the stability problem on the parameters of the discretization of these numerical methods is studied. It is shown that the mathematical models are sufficiently accurate to analyze the stability of the rods of constant and variable sections.

Improved Quantitation of Cephalin-Cholesterol Flocculation Test

1964 ◽  
Vol 10 (9) ◽  
pp. 781-788 ◽  
Author(s):  
Robert G Martinek ◽  
Elvira Vimba ◽  
Joseph D Mann
Keyword(s):  
Barium Sulfate ◽  
Quantitative Method ◽  
Turbidimetric Method ◽  
Flocculation Test ◽  
Laboratory Procedures ◽  
The Stability ◽  
Definition Of

Abstract A rapid turbidimetric method for the determination of cephalin-cholesterol flocculation is described. Greater specificity and photometric sensitivity have been achieved along with adequate precision. The test is standardized with the conventional barium sulfate turbidity standards used for other laboratory procedures. Definition of results in turbidity units is proposed, and photometric standardization of the cephalin-cholesterol emulsion described. The stability of the emulsion is elucidated. Comparison is made with a previously described quantitative method.

scholarly journals Theoretical Research on the Stability of the Transport Module Intended for Transport from the Seabed

2018 ◽  
Vol 1 (1) ◽  
pp. 605-612
Author(s):  
Wiktor Filipek ◽  
Krzysztof Broda
Keyword(s):  
Energy Source ◽  
Transport Process ◽  
Stability Problem ◽  
Average Density ◽  
Theoretical Research ◽  
Marine Deposits ◽  
New Methods ◽  
New Concepts ◽  
The Stability

Abstract The interest in sea mining has resulted in the recent years in the creation of many new methods for the exploitation of marine deposits as well as the transport from the seabed to the. For several years, the authors have been trying to develop new concepts of transport from the seabed. In previous publications, the authors presented the concept of an autonomous transport module for transport from the seabed. The research so far has focused on the development of the module’s operation principles, determination of the energy source in the transport process and changes in the average density of the transport module. In this publication, the authors focused on the stability problem of the transport module during deployment and ascent. This is a very important issue, because the stability of the module will determine its practical suitability for transport from the seabed.

Experiments on the stability of viscous flow between rotating cylinders - VI. Finite-amplitude experiments

1965 ◽  
Vol 283 (1395) ◽  
pp. 531-556 ◽  
Keyword(s):  
Stability Problem ◽  
High Speed ◽  
Amplification Factor ◽  
Finite Amplitude ◽  
Taylor Number ◽  
The Difference ◽  
The Stability ◽  
Speed Computer ◽  
Linear Stability Problem

The ion technique is applied to a variety of experiments in Couette flow: determination of the critical Taylor number; determination of wavenumber and waveform of the vortices; establishment of the laws that the square of the amplitude and the amplification factor both vary as the difference between the Taylor number and the critical Taylor number; and finally certain studies of the growth and decay of vortices as the Taylor number is changed. The experimental data are compared with the results of integration of the exact equations for the linear stability problem by means of a high-speed computer. These theo­retical values were obtained by P. H. Roberts and are presented in an appendix to this paper.

scholarly journals An HPLC and UHPLC-HRMS Approach to Study PSMA-11 Instability in Aqueous Solution

2020 ◽  
Author(s):  
ANTONELLA IUDICELLO ◽  
Filippo Genovese ◽  
Valentina Di Iorio ◽  
Gianfranco Cicoria ◽  
Stefano Boschi
Keyword(s):  
Analytical Method ◽  
Radiochemical Purity ◽  
Time Dependent ◽  
Dependent Manner ◽  
Compound Structure ◽  
High Affinity ◽  
Secondary Compound ◽  
The Stability ◽  
Definition Of

Abstract Background. Stability of precursors and reagents are of utmost importance for developing a suitable, fast and routinely reproducible analytical method for the quality control of radiopharmaceuticals, for the validation of the analytical method itself, as well as for radiolabeling procedure. During the validation of the analytical method used for the determination of chemical and radiochemical purity of an injectable solution of 68Ga-PSMA-11, a trend to instability of the PSMA-11 standard, the same used as a precursor in the radiosynthesis of 68Ga-PSMA11, has been found. This instability led to the formation of a secondary compound in a time-dependent manner. The formation of this compound made difficult the validation of the analytical method and influenced the radiolabeling yield, by increasing free 68Ga which, obviously, decreased the final yield.Results. The nature of this compound was investigated by adding chelators, such as EDTA, to PSMA-11 solutions and by using the combination of UHPLC-HRMS. The results led to the definition of the secondary compound structure, as natFe-PSMA-11, from the combination of the high affinity chelator HBED-CC, present in the molecule of PSMA-11, and environmental Fe(III).Conclusions. Strategies to reduce the risk of low radiolabeling yields and to increase the stability of the standards were also discussed.

Postmodern More

Moreana ◽  
2003 ◽  
Vol 40 (Number 153- (1-2) ◽  
pp. 219-239
Author(s):  
Anne Lake Prescott
Keyword(s):  
Human Language ◽  
Thomas More ◽  
The Stability ◽  
Definition Of ◽  
Recent Critic

Thomas More is often called a “humanist,” and rightly so if the word has its usual meaning in scholarship on the Renaissance. “Humanist” has by now acquired so many different and contradictory meanings, however, that it needs to be applied carefully to the likes of More. Many postmodernists tend to use the word, pejoratively, to mean someone who believes in an autonomous self, the stability of words, reason, and the possibility of determinable meanings. Without quite arguing that More was a postmodernist avant la lettre, this essay suggests that he was not a “humanist” who stalks the pages of much recent postmodernist theory and that in fact even while remaining a devout Catholic and sensible lawyer he was quite as aware as any recent critic of the slipperiness of human selves and human language. It is time that literary critics tightened up their definition of “humanist,” especially when writing about the Renaissance.

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