scholarly journals Realistic Choice of Annual Matrices Contracts the Range of λS Estimates

2021 ◽  
Author(s):  
Dmitrii O Logofet ◽  
Leonid L Golubyatnikov ◽  
Nina G Ulanova
Keyword(s):  
Realistic Choice

Bifurcation of rotating circular cylindrical elastic membranes

1980 ◽  
Vol 87 (2) ◽  
pp. 357-376 ◽  
Author(s):  
D. M. Haughton ◽  
R. W. Ogden
Keyword(s):  
Axial Force ◽  
Strain Energy ◽  
Elastic Strain Energy ◽  
Strain Energy Function ◽  
Angular Speed ◽  
Elastic Membrane ◽  
Axial Extension ◽  
End Conditions ◽  
Elastic Membranes ◽  
Realistic Choice

SummaryBifurcation from a finitely deformed circular cylindrical configuration of a rotating circular cylindrical elastic membrane is examined. It is found (for a physically realistic choice of elastic strain-energy function) that the angular speed attains a maximum followed by a minimum relative to the increasing radius of the cylinder for either a fixed axial extension or fixed axial force.At fixed axial extension (a) a prismatic mode of bifurcation (in which the cross-section of the cylinder becomes uniformly non-circular) may occur at a maximum of the angular speed provided the end conditions on the cylinder allow this; (b) axisyim-metric modes may occur before, at or after the angular speed maximum depending on the length of the cylinder and the magnitude of the axial extension; (c) an asymmetric or ‘wobble’ mode is always possible before either (a) or (b) as the angular speed increases from zero for any length of cylinder or axial extension. Moreover, ‘wobble’ occurs at lower angular speeds for longer cylinders.At fixed axial force the results are similar to (a), (b) and (c) except that an axisym-metric mode necessarily occurs between the turning points of the angular speed.

The Path Selection of Low Carbon Building Development

2013 ◽  
Vol 409-410 ◽  
pp. 660-663
Author(s):  
Xiao Wei Wu
Keyword(s):  
Economic Transition ◽  
Path Selection ◽  
Scientific Development ◽  
Low Carbon ◽  
Paper Briefly ◽  
Low Carbon Economy ◽  
Development Concept ◽  
Realistic Choice ◽  
Selection Of ◽  
Carbon Economy

the development of low carbon building is not only the requirement of current economic transition,it is also the realistic choice to implement Scientific Development Concept and to build "two type society". This paper briefly describes the connotation of low carbon buildings , and then illustrates the low-carbon economy background, the necessity of low carbon building development, and finally put forward the corresponding path selection.

Improvements in the Analysis of Ultrasonic Scattering from Inhomogeneities in Tissue

1979 ◽  
Vol 1 (1) ◽  
pp. 44-55 ◽  
Author(s):  
S. Ø. Aks ◽  
D. J. Vezzetti
Keyword(s):  
Scattering Theory ◽  
Limited Range ◽  
Ultrasonic Scattering ◽  
Sample Geometry ◽  
Realistic Choice

The elementary scattering theory of Rayleigh and Born is extended to account for effects of finite absorption and of sample geometry including boundary refraction. Examples of the procedure are given for several scatterer configurations and results compared with those of the Rayleigh-Born procedure. It is shown that for a realistic choice of tissue parameters these effects modify the Rayleigh-Born results by factors of the order of 10 percent or less provided observations are made over a suitably limited range of angles about the backward direction.

scholarly journals Realistic Choice of Annual Matrices Contracts the Range of λS Estimates

Mathematics ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 2252
Author(s):  
Dmitrii O. Logofet ◽  
Leonid L. Golubyatnikov ◽  
Nina G. Ulanova
Keyword(s):  
Markov Chain ◽  
Local Population ◽  
Quantitative Measure ◽  
Weather Data ◽  
Variable Environment ◽  
Annual Population ◽  
Novel Method ◽  
Stochastic Growth Rate ◽  
Realistic Choice

In matrix population modeling the multi-year monitoring of a population structure results in a set of annual population projection matrices (PPMs), which gives rise to the stochastic growth rate λS, a quantitative measure of long-term population viability. This measure is usually found in the paradigm of population growth in a variable environment. The environment is represented by the set of PPMs, and λS ensues from a long sequence of PPMs chosen at random from the given set. because the known rules of random choice, such as the iid (independent and identically distributed) matrices, are generally artificial, the challenge is to find a more realistic rule. We achieve this with the a following a Markov chain that models, in a certain sense, the real variations in the environment. We develop a novel method to construct the ruling Markov chain from long-term weather data and to simulate, in a Monte Carlo mode, the long sequences of PPMs resulting in the estimates of λS. The stochastic nature of sequences causes the estimates to vary within some range, and we compare the range obtained by the “realistic choice” from 10 PPMs for a local population of a Red-Book species to those using the iid choice. As noted in the title of this paper, this realistic choice contracts the range of λS estimates, thus improving the estimation and confirming the Red-Book status of the species.

NEUTRON–PROTON PAIRING EFFECT ON ONE-PROTON AND TWO-PROTON SEPARATION ENERGIES IN RARE-EARTH PROTON-RICH NUCLEI

2012 ◽  
Vol 21 (12) ◽  
pp. 1250100 ◽  
Author(s):  
F. HAMMACHE ◽  
N. H. ALLAL ◽  
M. FELLAH
Keyword(s):  
Wave Function ◽  
Rare Earth ◽  
Particle Number ◽  
Good Description ◽  
Mean Field ◽  
Pairing Effect ◽  
Pairing Correlations ◽  
The One ◽  
Proton Pairing ◽  
Realistic Choice

The one-proton and two-proton separation energies are studied for "ordinary" and rare-earth proton-rich nuclei by including the isovector neutron–proton (np) pairing correlations using the BCS approximation. Even–even as well as odd nuclei are considered. In the latter case, the wave function is defined using the blocked-level technique. The single-particle energies used are those of a deformed Woods–Saxon mean field. It is shown that the np isovector pairing effects on the one-proton and two-proton separation energies are non-negligible. However, the only isovector BCS approximation seems to be inadequate for a good description of these quantities when including the np pairing effects: either a particle-number projection or the inclusion of the isoscalar pairing effect seems to be necessary. Another possible improvement would be a more realistic choice of the pairing strengths.

scholarly journals Brexit and Its Impact on Poland’s Policy Towards Europe – An Attempt to Forecast

2020 ◽  
Vol 24 (2) ◽  
pp. 91-104
Author(s):  
Adrian Chojan
Keyword(s):  
European Union ◽  
Political Support ◽  
Economic Organization ◽  
The European Union ◽  
European Policy ◽  
Total Change ◽  
Political Consequences ◽  
The Common ◽  
Polish Government ◽  
Realistic Choice

Brexit has betrayed the disadvantages of the European project along with the fact that European institutions have no desire to conduct deeper reforms. Brexit cannot be considered without the stance that the British have developed not only in the last few years but generally over the period of its integration with continental Europe. A study shows the political consequences of the UK’s exit from the European Union alog with the potential scenarios of Poland’s European policy in the next 2–3 years. This article presents three scenarios for the development of Poland's European policy, i.e. the British scenario, a conservative scenario and a pro-European scenario. In addition, this article aims to show the potential activities of the Polish government in the context of selected scenarios for the development of the situation in Europe. Currently, the most likely is the British scenario, where the Polish government concentrates on those areas of integration that are important to it. The European Union will be treated by Poland as an economic organization providing access to the common European market as well as political support in the event of disputes with the powers. The adoption of the British scenario by Poland assumes an evolutionary drift towards polexit. The least realistic choice of scenario is the strongly pro-European approach. This would require a total change in Poland's European policy strategy and the abandoning of internal reforms.

To Perfect Environmental Legal System and Supervisory Mechanism, to Strengthen Sense of Social Responsibility in Enterprises - A Brief Discussion of the Relationship between Environmental Protection and Economic Development in Enterprises of Large and Medium-Sized Cities and the Strategies

2012 ◽  
Vol 524-527 ◽  
pp. 3294-3297
Author(s):  
Cong Li Xiao ◽  
Na Li ◽  
Xin Li
Keyword(s):  
Economic Development ◽  
Social Responsibility ◽  
Environmental Pollution ◽  
Environmental Protection ◽  
Legal System ◽  
Ecological Environment ◽  
Harmonious Development ◽  
Realistic Choice ◽  
The Relationship ◽  
Made In

Harmonious development of environmental protection and economy is a realistic choice made in specific national situation for economic development and environmental protection. It has some kind of complexity. However, large and medium-sized cities develop very fast and the problem of environmental pollution becomes more and more obvious. Thus, how to effectively coordinate the paradox between economic development and environmental protection in large and medium-sized cities and achieve the good cyclic double-win between economic development and ecological environment are the main contents of this paper.

Research on Index System for Strategic Environmental Assessment of Seaboard City

2013 ◽  
Vol 864-867 ◽  
pp. 1101-1105
Author(s):  
Lin Wang ◽  
Xiao Xia Zhang ◽  
Shu Ping Yu ◽  
Zhong Qiang Ma ◽  
Jing Hai Zhu
Keyword(s):  
Environmental Assessment ◽  
Index System ◽  
City Planning ◽  
Social Economic ◽  
Strategic Environmental Assessment ◽  
Energy Utilization ◽  
Soil Environment ◽  
Technical Procedure ◽  
The Index System ◽  
Realistic Choice

In order to ensure sustainable development of seaboard city, it needs to pay more attention to Strategic Environmental Assessment. It is a realistic choice for establishing a set of index system for environmental impact assessment of seaboard city planning. Based on theories and practice both home and abroad, the principles and technical procedure on SEA system of seashore city planning are discussed. The index system suitable for seaboard city is established. The index system includes three levels. The first level is divided into 4 categories, which are natural environment, resource and energy utilization, ecological environment and social-economic index. The second level is divided into 11 categories, such as surface water, atmosphere, acoustic and soil environment. The third level includes more than 90 indexes.

scholarly journals Research on Talent Cultivation Strategy of Adult Universities under the Background of “Mass Entrepreneurship and Innovation”

2020 ◽  
Author(s):  
Aixa Hafsha
Keyword(s):  
Evaluation System ◽  
Entrepreneurship Education ◽  
Traditional Education ◽  
Colleges And Universities ◽  
Main Body ◽  
Educational Concept ◽  
Training Mode ◽  
Cultivation Strategy ◽  
Realistic Choice ◽  
Innovation And Entrepreneurship

As a new educational concept and practice, innovation and entrepreneurship education has attracted enough attention in global adult colleges and universities. Strengthening innovation and entrepreneurship education and training innovation and entrepreneurship talents are the new requirements of innovation and development for the country’s innovation construction, the realistic choice of innovation for traditional education and accelerating the reform and development of adult colleges and universities, the inevitable requirement of improving the quality of graduates, and the promotion of College Students’ integration into the tide of “mass entrepreneurship and innovation”. Starting from the analysis of the current situation of innovation and entrepreneurship education in colleges and universities, based on the era background of “mass entrepreneurship, mass innovation”, taking the cultivation of “mass entrepreneurship and innovation” as the goal, this paper discusses the construction method of innovation and entrepreneurship curriculum system with ability as the core, students as the main body and market as the guide, and puts forward that it is necessary to update the educational concept, correctly position the training goal, and formulate and improve the entrepreneurship curriculum. We should reform the talent evaluation system of adult colleges and universities, strengthen the power of entrepreneurship and innovation mentors, and strengthen the cooperation between schools and enterprises. We should innovate the talent training mode of “mass entrepreneurship and innovation” in adult colleges and universities, put forward proposals for the implementation of the new talent training mode of “mass entrepreneurship and innovation” in adult colleges and universities, and provide theoretical support for the cultivation of “mass entrepreneurship and innovation” talents in adult colleges and universities.

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