A Simple Technique for Maximizing the Fundamental Frequency of Vibrating Structures

2000 ◽  
Vol 122 (4) ◽  
pp. 341-349 ◽  
Author(s):  
J. H. Ong ◽  
G. H. Lim
Keyword(s):  
Natural Frequency ◽  
Dimensional Analysis ◽  
Simple Technique ◽  
Nodal Line ◽  
The Other ◽  
Two Dimensional ◽  
Nodal Lines ◽  
Vibrating Structures ◽  
Original Configuration ◽  
The Ideal

A general approach for finding the optimal support locations to maximize the fundamental natural frequency of vibrating structures is described in this paper. The key to the procedure is to place the necessary supports in such a way, so as to eliminate the lower modes from the original configuration. This is accomplished by placing supports along the nodal lines of the highest possible mode from the original configuration, so that all the other lower modes are eliminated by the introduction of new or extra supports to the structure. For two-dimensional analysis, the average driving point residues calculated along a nodal line is used as an indicator for finding the vicinity of the ideal support locations. [S1043-7398(00)00504-1]

Theoretical Determination of Natural Modes of Deck Vibrations

1966 ◽  
Vol 3 (01) ◽  
pp. 66-79
Author(s):  
Robert D. Short
Keyword(s):  
Boundary Conditions ◽  
Natural Frequency ◽  
Maximum Error ◽  
Nodal Line ◽  
The Other ◽  
Mode Shapes ◽  
Theoretical Determination ◽  
Natural Modes

Six methods for calculating the natural frequency and mode shapes of cross-stiffened plating were examined particularly for their application to plating with a large number of small closely spaced stiffeners in one direction supported by a few deep girders in the other. The best method was able to predict at least 1 6 frequencies (all that were measured) of a model with a maximum error of less than 15 percent when proper boundary conditions were used. The maximum error in nodal-line locations for the best method was 5.2 percent of the span

Coexistence of open and closed type nodal line topological semimetals in two dimensional B2C

2018 ◽  
Vol 6 (5) ◽  
pp. 1206-1214 ◽  
Author(s):  
P. Zhou ◽  
Z. S. Ma ◽  
L. Z. Sun
Keyword(s):  
Nodal Line ◽  
Two Dimensional ◽  
Nodal Lines ◽  
Closed Type ◽  
Topological Semimetal ◽  
Topological Semimetals

The detection of open and closed type nodal lines in the bilayer topological semimetal B2C on the substrate of Cu(110).

scholarly journals Conceptual change of disaster management models: A thematic analysis

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Mehdi Nojavan ◽  
Esmail Salehi ◽  
Babak Omidvar
Keyword(s):  
Disaster Management ◽  
Thematic Analysis ◽  
The Other ◽  
One Dimension ◽  
Comprehensive Model ◽  
Two Dimensional ◽  
Final Phase ◽  
Management Models ◽  
Management Actions ◽  
The Ideal

Different models have been proposed for disaster management by researchers and agencies. Despite their efficiency in some locations, disasters are still a fundamental challenge in the way of sustainable development. The purpose of this research is developing a comprehensive conceptual model for disaster management using thematic analysis. In this regard, first, disaster management models are collected. In the next stage, the themes of each model are extracted and categorised in three phases. In the first phase that is descriptive coding, available elements in each model are extracted as code and the basic themes are recognised. Then, in the phase of interpretive coding, basic themes are classified in three categories that are called organising themes (i.e. hazard assessment, risk management and management actions). In the final phase, strategic management is selected as the global or overarching theme to integrate all the other themes. Based on thematic analysis, it can be concluded that disaster management has three main elements that are the three organising themes. Therefore, comprehensive model of disaster management should include these three elements and their sub-basic themes that is called the ideal or criterion type. Results showed that some scientists have looked at disaster management one dimensionally (one theme). Even in two-dimensional models, one dimension has advantage over the other one. While the proposed typology in this study showed that the comprehensive model should include all the three mentioned elements.

Regional variation of beekeeping in Poland

2021 ◽  
Vol 66 (2) ◽  
pp. 25-38
Author(s):  
Małgorzata Kobylińska
Keyword(s):  
Dimensional Analysis ◽  
Natural Environment ◽  
Regional Variation ◽  
Secondary Data ◽  
The Other ◽  
Two Dimensional ◽  
The One ◽  
Bee Colonies ◽  
Different Parts ◽  
Research Institute

Beekeeping is of great significance for the development of agriculture. On the one hand, it may be considered in the context of the acquisition of bee products by beekeepers, and on the other, in terms of the role bees play in the natural environment , i.e. their contribution to the production of higher and better crops. The aim of the paper is to present the beekeeping sector across Poland's regions and to describe the changes it underwent in the studied period. The research was conducted in 2012, 2016 and 2019. The study uses secondary data from reports produced by the Apicultural Division of the Apicultural Division of the Research Institute of Horticulture in Puławy that relate to selected issues concerning the beekeeping sector in Poland. The differences in beekeeping in different parts of Poland were subject to one- and two-dimensional analysis. The latter was performed using methods based on the measurements of the depth of observations in the sample. The research demonstrates that the number of bee colonies and the number of beekeepers were on the rise in the studied years. The largest number of bee colonies was observed in Lubelskie, Małopolskie, Podkarpackie and Warmińsko-Mazurskie voivodships, while the largest production of honey was registered in Lubelskie Voivodship.

Strain tuning of closed topological nodal lines and opposite pockets in quasi-two-dimensional α-phase FeSi2

2020 ◽  
Vol 22 (24) ◽  
pp. 13650-13658 ◽  
Author(s):  
Xiaotian Wang ◽  
Zhenxiang Cheng ◽  
Gang Zhang ◽  
Minquan Kuang ◽  
Xiao-Lin Wang ◽  
...  
Keyword(s):  
Mechanical Strain ◽  
Nodal Line ◽  
Type I ◽  
Type Ii ◽  
Two Dimensional ◽  
Nodal Lines ◽  
Hybrid Type ◽  
Α Phase ◽  
Single Material

α-FeSi2 is a valuable candidate for spintronics application by utilization of type I, type II, and hybrid-type topological nodal line semimetals in a single material tuned by mechanical strain.

Three-Dimensional Reconstruction of Two Forms of the Chaperonin GRO EL

1990 ◽  
Vol 48 (1) ◽  
pp. 258-259
Author(s):  
J.L. Carrascosa ◽  
G. Abella ◽  
S. Marco ◽  
M. Muyal ◽  
J.M. Carazo
Keyword(s):  
Three Dimensional ◽  
The Other ◽  
Two Dimensional ◽  
Series Method ◽  
Three Dimensional Reconstruction ◽  
Structural Components ◽  
E Coli ◽  
Dimensional Reconstruction ◽  
Morphogenetic Factors ◽  
Tilt Series

Chaperonins are a class of proteins characterized by their role as morphogenetic factors. They trantsiently interact with the structural components of certain biological aggregates (viruses, enzymes etc), promoting their correct folding, assembly and, eventually transport. The groEL factor from E. coli is a conspicuous member of the chaperonins, as it promotes the assembly and morphogenesis of bacterial oligomers and/viral structures.We have studied groEL-like factors from two different bacteria:E. coli and B.subtilis. These factors share common morphological features , showing two different views: one is 6-fold, while the other shows 7 morphological units. There is also a correlation between the presence of a dominant 6-fold view and the fact of both bacteria been grown at low temperature (32°C), while the 7-fold is the main view at higher temperatures (42°C). As the two-dimensional projections of groEL were difficult to interprete, we studied their three-dimensional reconstruction by the random conical tilt series method from negatively stained particles.

NEUROTIC SYMPTOMATICS RELATED TO PERSONAL CHARACTERISTICS IN YOUTH

2019 ◽  
pp. 2014-2019
Author(s):  
Milen Dimov
Keyword(s):  
Personal Characteristics ◽  
The Self ◽  
The Other ◽  
Social Responsiveness ◽  
Training Process ◽  
Self Assessment ◽  
School Year ◽  
Real Behavior ◽  
Low Levels ◽  
The Ideal

The present study traces the dynamics of personal characteristics in youth and the manifested neurotic symptoms in the training process. These facts are the reason for the low levels of school results in the context of the existing theoretical statements of the problem and the empirical research conducted among the trained teenagers. We suggest that the indicators of neurotic symptomatology in youth – aggression, anxiety, and neuroticism, are the most demonstrated, compared to the other studied indicators of neurotic symptomatology. Studies have proved that there is a difference in the act of neurotic symptoms when tested in different situations, both in terms of expression and content. At the beginning of the school year, neurotic symptoms, more demonstrated in some aspects of aggressiveness, while at the end of school year, psychotism is more demonstrated. The presented summarized results indicate that at the beginning of the school year, neurotic symptoms are strongly associated with aggression. There is a tendency towards a lower level of social responsiveness, both in the self-assessment of real behavior and in the ideal “I”-image of students in the last year of their studies. The neurotic symptomatology, more demonstrated due to specific conditions in the life of young people and in relation to the characteristics of age.

KONSTRUKSI ISLAM DALAM KEKUASAAN NEGARA

1970 ◽  
Vol 6 (2) ◽  
Author(s):  
Nurul Aini Musyarofah
Keyword(s):  
Islamic Law ◽  
Social Condition ◽  
The Other ◽  
Good Society ◽  
Ideal Form ◽  
Other Hand ◽  
Islamic Politics ◽  
The Relationship ◽  
The Ideal

The relationship between Islam and state raises a controversy that includes two main groups;formalists and substantialists. Both of them intend to achieve a good social condition which is inaccordance with Islamic politics. The ideal form of good society to be achieved is principallydescribed in the main source of Islamic law, Al Qur’an and As Sunnah, as follows. A form of goodsociety should supprot equality and justice, egalitarianism, and democracy in its social community.The next problem is what the needed methods and instruments to achieve the ideal Islamic politicsare. In this case, the debate on the formalization and substance of Islamic teaching is related to therunning formal political institution.Each group claims itself to be the most representative to the ideal Islam that often leads to anescalating conflict. On the other hand thr arguments of both groups does not reach the wholeMuslims. As a result, the discourse of Islam and state seems to be elitist and political. As a result,Both groups suspect each other each other and try to utilize the controversy on the relationshipbetween Islam and state to get their own benefit which has no relation with the actualization ofIslamic teaching.

Polymer-Graphene Nanoassemblies and their Applications in Cancer Theranostics

2020 ◽  
Vol 20 (11) ◽  
pp. 1340-1351 ◽  
Author(s):  
Ponnurengam M. Sivakumar ◽  
Matin Islami ◽  
Ali Zarrabi ◽  
Arezoo Khosravi ◽  
Shohreh Peimanfard
Keyword(s):  
Mechanical Stability ◽  
Chemical Properties ◽  
The Other ◽  
Hydrophilic Polymer ◽  
Two Dimensional ◽  
Normal Tissues ◽  
Physical Chemical ◽  
Anti Cancer ◽  
Good Biocompatibility ◽  
Cancer Theranostics

Background and objective: Graphene-based nanomaterials have received increasing attention due to their unique physical-chemical properties including two-dimensional planar structure, large surface area, chemical and mechanical stability, superconductivity and good biocompatibility. On the other hand, graphene-based nanomaterials have been explored as theranostics agents, the combination of therapeutics and diagnostics. In recent years, grafting hydrophilic polymer moieties have been introduced as an efficient approach to improve the properties of graphene-based nanomaterials and obtain new nanoassemblies for cancer therapy. Methods and results: This review would illustrate biodistribution, cellular uptake and toxicity of polymergraphene nanoassemblies and summarize part of successes achieved in cancer treatment using such nanoassemblies. Conclusion: The observations showed successful targeting functionality of the polymer-GO conjugations and demonstrated a reduction of the side effects of anti-cancer drugs for normal tissues.

Sign in / Sign up

Export Citation Format

Share Document