An unusual physical phenomenon in biology

1992 ◽  
Vol 35 (3) ◽  
pp. 234-240
Author(s):  
A. G. Bakirov
Keyword(s):  
Physical Phenomenon

Characteristics of Physics Module about Mechanics-Based on Multi Representation to Improve Students of Senior High School Reasoning Ability

2017 ◽  
Vol 6 (3) ◽  
Author(s):  
Dimas Fawahid Tamimi Anwar ◽  
I Ketut Mahardika ◽  
S Supeno (Page 14-23)
Keyword(s):  
High School ◽  
High School Students ◽  
Physical Phenomenon ◽  
Senior High School ◽  
Reasoning Ability ◽  
School Students ◽  
Material Sample ◽  
Instructions For Use ◽  
Module Development ◽  
Method Model

This study is about the characteristics of Physics Module to improve students of Senior High School reasoning ability-based on Multirepresentation. The problem of study is how characteristics of Physics Modules Based on Multirepresentation to improve students ability to reason? This problem is described in two study questions. First, is the Physics Module based on Multirepresentation contains examples of the application context of the image phenomenon ofphysics? Second, how is the writing pattern of Physics Module? This study is about Physics module development based on Multirepresentation, using the mix method model of investigation that collecting qualitative data, then construct the draft Module Physics, so the Module Physics ready to be validated. Subjects in this study is a Physics module which can improve the reasoning ability of students in Senior High School. While respondents were Senior High School students majoring in science at the students in Senior High School. Data collection techniques are observations, questionnaires, and documents. Data described in qualitative research. The results showed that the physics module based on Multirepresentation contains examples of application of the principle of material in the context of the image physical phenomenon ; and has a certain writing pattern, which has a chapter title sequence, sub-chapter title, instructions for use, a description of the material, sample questions, questions test capabilities, and bibliography.

An Overview of Optimization of Spherical Crystallisation Process

2013 ◽  
Vol 6 (4) ◽  
pp. 2203-2209
Author(s):  
N B Bhagat ◽  
A V Yadav ◽  
P R Mastud ◽  
R A Khutale
Keyword(s):  
Physical Phenomenon ◽  
Chemical Properties ◽  
Spherical Shape ◽  
Particle Engineering ◽  
Spherical Crystallization ◽  
Stirring Rate ◽  
Physico Chemical ◽  
Rate Selection ◽  
Pharmaceutical Agents ◽  
Spherical Crystals

In this article we describe the optimizing parameters in the process of spherical crystallisation. Particle engineering of active pharmaceutical agents is an innovative area of research in pharmaceutical industry because of several advantages. Spherical crystallization is one of the particle engineering technique in which drug directly gets crystallized and agglomerated into spherical shape. The spherical crystals can be obtained by different methods like solvent change, Quasi-emulsion droplet, ammonia diffusion and neutralisation. The optimization of process of spherical crystallization is important for obtaining the ideal spherical crystal agglomerates. It includes stirring rate, selection of solvent, pH, temperature etc. which affects on the physico-chemical properties of crystals. These optimizing parameters play its specific role in formation of spherical crystals. Stirring rate affects the shape as well as size of the final agglomerates and solvent selection helps in the formation of maximum amount of agglomerates in the system. The factors like pH and temperature should be maintained in case of drugs which show polymorphism. Apart from this, several others physical phenomenon or parameters like interfacial tension and rate of crystallisation are also important for thorough optimization of process.  

Estimate of Hyperconjugation Strength in Alkylaromatics and Unsaturated Hydrocarbons Derived from Refractometric Data

2020 ◽  
Vol 23 (23) ◽  
pp. 2598-2613
Author(s):  
Boris A. Zaitsev
Keyword(s):  
Quantitative Estimation ◽  
Physical Phenomenon ◽  
Unsaturated Hydrocarbons ◽  
Resonance Effects ◽  
Alkyl Derivatives ◽  
Retrospective View ◽  
Scientific Papers ◽  
Polycyclic Aromatic ◽  
Qualitative Measure ◽  
Steric Inhibition Of Resonance

: A retrospective view of exaltation of refraction observed for many unsaturated and aromatic compounds demonstrates that this physical phenomenon is undeservedly considered only as a qualitative measure of conjugation. This mini-review discusses numerous papers by the author that have been published earlier in inaccessible periodicals and collections of scientific papers. Using a great number of illustrations, the author shows that this parameter can be successfully used for quantitative estimate of resonance effects in organic and polymer chemistry. The methods for derivation of strictly additive atomic and group refraction constants are described; these constants were subsequently used as a tool that allowed quantitative estimation of resonance effects in mono-, di-, tri- and polyalkylbenzenes, alkylnaphthalenes, some alkyl derivatives of unsaturated hydrocarbons. These effects cause strictly fixed increase in refraction of carbon atoms in different structural modifications (graphene, fullerene, diamond) and in polycyclic aromatic hydrocarbons. The relevant results regarding quantitative estimation of degree of steric inhibition of resonance in sterically hindered ortho-dialkylbenzenes, 1,2,3- trialkyl-, 1,2,3,4-tetraalkyl-, and 1,2,3,4,5-polyalkylbenzenes accumulated by the author are summarized.

EUCOR: An Efficient Unequal Clustering and Optimal Routing in wireless sensor networks for energy conservation

2021 ◽  
pp. 1-9
Author(s):  
C. Jothikumar ◽  
Revathi Venkataraman ◽  
T. Sai Raj ◽  
J. Selvin Paul Peter ◽  
T.Y.J. Nagamalleswari
Keyword(s):  
Objective Function ◽  
Physical Phenomenon ◽  
Minimum Energy ◽  
Cluster Head ◽  
Industrial Applications ◽  
Base Station ◽  
Wireless Sensor ◽  
Unequal Clustering ◽  
Minimum Energy Consumption ◽  
Variable Cluster

Wireless sensor network is a wide network that works as a cutting edge model in industrial applications. The sensor application is mostly used for high security systems that provide safety support to the environment. The sensor system senses the physical phenomenon, processes the input signal and communicates with the base station through its neighbors. Energy is the most important criterion to support a live network for long hours. In the proposed system, the EUCOR (Efficient Unequal Clustering and Optimized Routing) protocol uses the objective function to identify the efficient cluster head with variable cluster size. The computation of the objective function deals with the ant colony approach for minimum energy consumption and the varying size of the cluster in each cycle is calculated based on the competition radius. The system prolongs the lifespan of the nodes by minimizing the utilization of energy in the transmission of packets in the networks when compared with the existing system.

scholarly journals On the Experimental, Numerical and Data-Driven Methods to Study Urban Flows

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1310
Author(s):  
Pablo Torres ◽  
Soledad Le Clainche ◽  
Ricardo Vinuesa
Keyword(s):  
Physical Phenomenon ◽  
Urban Pollution ◽  
Pollutant Dispersion ◽  
Urban Environments ◽  
Machine Learning Algorithms ◽  
Data Driven ◽  
Thermal Fields ◽  
Use Of Data ◽  
Sustainability Challenges ◽  
New Research

Understanding the flow in urban environments is an increasingly relevant problem due to its significant impact on air quality and thermal effects in cities worldwide. In this review we provide an overview of efforts based on experiments and simulations to gain insight into this complex physical phenomenon. We highlight the relevance of coherent structures in urban flows, which are responsible for the pollutant-dispersion and thermal fields in the city. We also suggest a more widespread use of data-driven methods to characterize flow structures as a way to further understand the dynamics of urban flows, with the aim of tackling the important sustainability challenges associated with them. Artificial intelligence and urban flows should be combined into a new research line, where classical data-driven tools and machine-learning algorithms can shed light on the physical mechanisms associated with urban pollution.

scholarly journals Stimulating Mechanistic Reasoning in Physics Using Student-Constructed Stop-Motion Animations

2021 ◽  
Author(s):  
Rayendra Wahyu Bachtiar ◽  
Ralph F. G. Meulenbroeks ◽  
Wouter R. van Joolingen
Keyword(s):  
Conceptual Understanding ◽  
Physical Phenomenon ◽  
Ninth Grade ◽  
Abstract Concepts ◽  
Projectile Motion ◽  
Mechanistic Reasoning ◽  
Stop Motion ◽  
Ninth Grade Students ◽  
Scientific Phenomena

AbstractThis article reports on a case study that aims to help students develop mechanistic reasoning through constructing a model based stop-motion animation of a physical phenomenon. Mechanistic reasoning is a valuable thinking strategy for students in trying to make sense of scientific phenomena. Ten ninth-grade students used stop-motion software to create an animation of projectile motion. Retrospective think-aloud interviews were conducted to investigate how the construction of a stop-motion animation induced the students’ mechanistic reasoning. Mechanistic reasoning did occur while the students engaged in creating the animation, in particular chunking and sequencing. Moreover, all students eventually exhibited mechanistic reasoning including abstract concepts, e.g., not directly observable agents. Students who reached the highest level of mechanistic reasoning, i.e., chaining, demonstrated deeper conceptual understanding of content.

EXISTENCE OF PERIODIC SOLUTIONS FOR A FREE BOUNDARY PROBLEM OF HYPERBOLIC TYPE

2008 ◽  
Vol 05 (04) ◽  
pp. 785-806
Author(s):  
KAZUAKI NAKANE ◽  
TOMOKO SHINOHARA
Keyword(s):  
Mathematical Model ◽  
Free Boundary ◽  
Hyperbolic Equation ◽  
Boundary Problem ◽  
Free Boundary Problem ◽  
Physical Phenomenon ◽  
Hyperbolic Type ◽  
Existence Of Periodic Solutions ◽  
A Free Boundary Problem ◽  
Thin Tape

A free boundary problem that arises from the physical phenomenon of "peeling a thin tape from a domain" is treated. In this phenomenon, the movement of the tape is governed by a hyperbolic equation and is affected by the peeling front. We are interested in the behavior of the peeling front, especially, the phenomenon of self-excitation vibration. In the present paper, a mathematical model of this phenomenon is proposed. The cause of this vibration is discussed in terms of adhesion.

Time Domain Simulations on a Single Point Moored Submerged Sphere of Variable Radius

2005 ◽  
Author(s):  
Joa˜o M. B. P. Cruz ◽  
Anto´nio J. N. A. Sarmento
Keyword(s):  
Wave Propagation ◽  
Time Domain ◽  
Physical Phenomenon ◽  
Single Point ◽  
Vertical Direction ◽  
Equation Of Motion ◽  
Hydrodynamic Coefficients ◽  
Energy Converter ◽  
Submerged Sphere ◽  
The Time Domain

This paper presents a different approach to the work developed by Cruz and Sarmento (2005), where the same problem was studied in the frequency domain. It concerns the same sphere, connected to the seabed by a tension line (single point moored), that oscillates with respect to the vertical direction in the plane of wave propagation. The pulsating nature of the sphere is the basic physical phenomenon that allows the use of this model as a simulation of a floating wave energy converter. The hydrodynamic coefficients and diffraction forces presented in Linton (1991) and Lopes and Sarmento (2002) for a submerged sphere are used. The equation of motion in the angular direction is solved in the time domain without any assumption about its output, allowing comparisons with the previously obtained results.

Effect of Transverse Moduli on Through-Thickness Hygrothermal Expansion Coefficients of Composite Laminates

2001 ◽  
Vol 68 (6) ◽  
pp. 878-879 ◽  
Author(s):  
H.-L. Yeh ◽  
H.-Y. Yeh
Keyword(s):  
Composite Laminates ◽  
Stress Condition ◽  
Physical Phenomenon ◽  
Point Of View ◽  
Plane Stress Condition ◽  
Geometrical Symmetry ◽  
Thermal Expansion Coefficients ◽  
Isotropic Composite ◽  
Practical Analysis ◽  
Expansion Coefficients

In practical analysis, under a plane stress condition, a unidirectional lamina can be assumed with E2=E3 from geometrical symmetry consideration. However, from an academic point of view, it is interesting to study the case of a lamina with E2≠E3. In this paper the preliminary results of the physical phenomenon about the effect of different transverse moduli E2 and E3 on the through-thickness thermal expansion coefficients αz of quasi-isotropic composite laminates is presented.

Incentives for Using LEIM in the Investigation of Corrosion Initiation on Organic Coated Alloys

2001 ◽  
Vol 699 ◽  
Author(s):  
S. R. Taylor ◽  
A.M. Mierisch
Keyword(s):  
Electrochemical Impedance ◽  
Numerical Models ◽  
Physical Phenomenon ◽  
Product Formation ◽  
Coated Metal ◽  
Aqueous Environments ◽  
Damage Process ◽  
Experimental Process ◽  
Measurement Artifact ◽  
Insight Into

AbstractLocal electrochemical impedance mapping and spectroscopy (LEIM/S) have become important tools for the investigation of local electrochemical breakdown events associated with the degradation of organically coated metals in aqueous environments. LEIM/S of organic coated metal substrates has revealed local degradation events that are distributed spatially and temporally. These observations provide support to a number of long-standing theories, as well as provide new insight into the damage process. The local changes in impedance observed at early stages of immersion support the presence of virtual pores, while the metastability of impedance peaks representing the local changes provide evidence of healing via corrosion product formation. Each of these are long-standing theories used to explain global electrochemical impedance measurements. This paper will provide an overview of some of the events observed using LEIM and examine these results in the context of recent analytical and numerical models. Models used to predict the electric field above an equipotential disk electrode support the interpretation of most experimental LEI data as being representative of chemical and physical phenomenon and not a result of measurement artifact. However, certain features may be an artifact of the finite nature of the experimental process. The interpretation of LEIM events in view of current experimental and modeling results will be discussed.

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