The Growing And Weeding of Dandelions

2021 ◽  
Vol 2 (12) ◽  
pp. 26-36
Author(s):  
Tim Sharp ◽  
Keyword(s):  
Solar System ◽  
Short Story ◽  
Indigenous Population ◽  
Radio Signal ◽  
Solar Systems ◽  
Democratic Vote ◽  
Over Time

Can the stakes ever be so high that genocide of a species is a reasonable option? Is this ever the kind of choice you should put to a democratic vote? In this work of philosophical short story fiction, a civilization-sized space ship has been flying to populate the surrounding solar systems. They start with a skeleton crew, use ship resources and grow their population over generations, then arrive at a new planet. They drop off the extra people, replenish their raw resources, and do it all again. All is well until a weak radio signal makes them realize they are heading towards a planet that likely already has sentient alien life. If they don’t stop, their population will burst at the seams in the ship and they will likely run out of resources before the next solar system. If they do stop, they are likely to, over time, subjugate the indigenous population. They have just weeks to decide if they plan to make a course correction.

scholarly journals A Novel Extension Decision-Making Method for Selecting Solar Power Systems

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Meng-Hui Wang
Keyword(s):  
Decision Making ◽  
Solar System ◽  
Power Systems ◽  
Power System ◽  
Solar Power ◽  
Important Task ◽  
Extension Theory ◽  
Solar Systems ◽  
Load Demand ◽  
Generating Capacity

Due to the complex parameters of a solar power system, the designer not only must think about the load demand but also needs to consider the price, weight, and annual power generating capacity (APGC) and maximum power of the solar system. It is an important task to find the optimal solar power system with many parameters. Therefore, this paper presents a novel decision-making method based on the extension theory; we call it extension decision-making method (EDMM). Using the EDMM can make it quick to select the optimal solar power system. The paper proposed this method not only to provide a useful estimated tool for the solar system engineers but also to supply the important reference with the installation of solar systems to the consumer.

scholarly journals The Intertextual Use of Greek Mythology in Agatha Christie’s Detective Fiction

2020 ◽  
Vol 6 (2) ◽  
pp. 321-331
Author(s):  
Tatiana Ternopol
Keyword(s):  
Short Stories ◽  
Short Story ◽  
Detective Fiction ◽  
Comparative Methods ◽  
Greek Mythology ◽  
Short Story Collection ◽  
The Face ◽  
Greek Myths ◽  
Story Collection ◽  
Over Time

This study investigates the intertextual use of Greek mythology in Agatha Christie’s short stories Philomel Cottage, The Face of Helen, and The Oracle at Delphi, a short story collection The Labours of Hercules, and a novel, Nemesis. The results of this research based on the hermeneutical and comparative methods reveal that A. Christie’s intertextual formula developed over time. In her early works, allusions were based on characters' appearances and functions as well as on the use of motifs and themes from Greek myths. Later on, she turned to using allusory character names; this would mislead her readers who thought they already knew the formula of her stories. Although not a postmodern writer, A. Christie enjoyed playing games of allusion with her readers. She wanted them not only to solve a case but also to discover and interpret the intertextual references.

Epilogue: Paradigms, Problems, and Predictions

2017 ◽  
Author(s):  
John Chambers ◽  
Jacqueline Mitton
Keyword(s):  
Solar System ◽  
Planetary Systems ◽  
Planetary Science ◽  
Good Time ◽  
Science Program ◽  
The Galaxy ◽  
Recent Developments ◽  
Powerful Stimulus ◽  
Rapid Pace ◽  
Over Time

This concluding chapter talks about how astronomers and space agencies in dozens of countries are helping to see the solar system as never before, transforming points of light into real worlds, and even bringing samples of those worlds back to Earth. At the same time, the stunning discovery of hundreds of other planetary systems in the galaxy has provided a powerful stimulus to understand how planetary systems form and evolve, and to find out what makes one system different from another. Moreover, in 2010, NASA announced its latest science plan. One of the key goals for NASA's future planetary science program is to learn how the Sun's family began and how it has changed over time. The chapter argues that the rapid pace of recent developments makes now a good time to take stock of what scholars know, even though the story is still incomplete.

scholarly journals Turning solar systems into extrasolar planetary systems in stellar clusters

2010 ◽  
Vol 6 (S276) ◽  
pp. 304-307
Author(s):  
Melvyn B. Davies
Keyword(s):  
Solar System ◽  
Planetary System ◽  
Large Fraction ◽  
Planetary Systems ◽  
Single Star ◽  
Solar Systems ◽  
Close Encounters ◽  
Eccentric Orbits ◽  
The Galaxy ◽  
Hostile Environments

AbstractMany stars are formed in some form of cluster or association. These environments can have a much higher number density of stars than the field of the galaxy. Such crowded places are hostile environments: a large fraction of initially single stars will undergo close encounters with other stars or exchange into binaries. We describe how such close encounters and exchange encounters will affect the properties of a planetary system around a single star. We define singletons as single stars which have never suffered close encounters with other stars or spent time within a binary system. It may be that planetary systems similar to our own solar system can only survive around singletons. Close encounters or the presence of a stellar companion will perturb the planetary system, leading to strong planet-planet interactions, often leaving planets on tighter and more eccentric orbits. Thus, planetary systems which initially resembled our own solar system may later more closely resemble the observed extrasolar planetary systems.

scholarly journals A Standard-Based Method to Simulate the Behavior of Thermal Solar Systems with a Stratified Storage Tank

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 266 ◽  
Author(s):  
Edoardo Alessio Piana ◽  
Benedetta Grassi ◽  
Laurent Socal
Keyword(s):  
Solar System ◽  
Solar Energy ◽  
Storage Tank ◽  
Hot Water ◽  
Design Parameters ◽  
Fluid Temperature ◽  
Forced Circulation ◽  
Solar Systems ◽  
Solar Field ◽  
The Impact

Thermal solar systems are interesting solutions to reduce CO 2 emissions and gradually promote the use of renewable sources. However, sizing such systems and analysing their behavior are still challenging issues, especially for the trade-off between useful solar energy maximization and stagnation risk minimization. The new EPB (Energy Performance of Buildings) standard EN 15316-4-3:2017 offers several methods to evaluate the performance of a forced circulation solar system. One of them is a dynamic hourly method that must be used together with EN 15316-5:2017 for the simulation of the stratified storage tank connected with the solar loop. In this work, such dynamic hourly method is extended to provide more realistic predictions. In particular, modeling of the pump operation due to solar fluid temperature exceeding a set threshold, or due to low temperature differential between solar field and storage tank, is introduced as an on–off control. The implemented code is applied to a case study of solar system for the preparation of domestic hot water and the impact of different design parameters is evaluated. The model predicts a higher risk of overtemperature lock-out or stagnation when the solar field surface is increased, the storage volume is reduced and water consumption is set to zero to simulate summer vacation periods. Finally, a simple modulating control with a time step of a few seconds to a few minutes is introduced, quantitatively showing the resulting benefits in terms of useful solar energy increase, back-up operation savings and reduced auxiliary energy use.

scholarly journals NATURAL TRANSFER OF VIABLE MICROBES IN SPACE FROM PLANETS IN EXTRA-SOLAR SYSTEMS TO A PLANET IN OUR SOLAR SYSTEM AND VICE VERSA

2008 ◽  
Vol 690 (1) ◽  
pp. 210-215 ◽  
Author(s):  
Mauri Valtonen ◽  
Pasi Nurmi ◽  
Jia-Qing Zheng ◽  
Francis A. Cucinotta ◽  
John W. Wilson ◽  
...  
Keyword(s):  
Solar System ◽  
Solar Systems

scholarly journals Numerical Experiments on the Motion of the Outer Planets

1992 ◽  
Vol 152 ◽  
pp. 25-32 ◽  
Author(s):  
Gerald D. Quinlan
Keyword(s):  
Lyapunov Exponent ◽  
Solar System ◽  
Probability Distribution ◽  
Numerical Experiments ◽  
Initial Conditions ◽  
Major Axis ◽  
Solar Systems ◽  
Outer Planets ◽  
System A ◽  
Real Value

We have integrated the motion of the four Jovian planets on Myr timescales in fictitious solar systems in which the orbits differ from those of the real solar system. A change of ≲1% in the major axis of any one of the planets from its real value can lead to chaotic motion with a Lyapunov exponent larger than 10-5 yr−1. A survey of fifty solar systems with initial conditions chosen at random from a reasonable probability distribution shows the majority of them to be chaotic.

Development of Mid-IR Lasers for Laser Remote Sensing

2005 ◽  
Vol 883 ◽  
Author(s):  
Alexander Soibel ◽  
Kamjou Mansour ◽  
Gary Spiers ◽  
Siamak Forouhar
Keyword(s):  
Solar System ◽  
Chemical Species ◽  
Outer Solar System ◽  
Current Effort ◽  
Solar Systems ◽  
Quantum Cascade ◽  
Laser Reflectance ◽  
Ir Reflectance ◽  
Illumination Source

AbstractThere is a need in NASA for development of mid-infrared (mid-IR) lasers, such as Quantum Cascade (QC) lasers, for in-situ and remote laser spectrometers. Mid-IR, compact, low power consumption laser spectrometers have a great potential for detection and measurements of planetary gases and biological important biomarker molecules such as H2O, H2O2, CH4, and many additional chemical species on Mars and other planets of Solar systems. Other applications of mid-IR QC lasers are in high power remote Laser Reflectance Spectrometer (LRS) instruments for future NASA outer solar system explorations. In LSR instruments, QC lasers will act as the illumination source for conducting active mid-IR reflectance spectroscopy of solidsurfaced objects in the outer Solar System. LRS instruments have the potential to provide an incredible amount of information about the compositions of surfaces in the outer Solar System. In this work, we will discuss our current effort at JPL to develop and improve the mid-IR QC lasers to a level that the laser performance, operational requirements and reliability will be compatible with the instruments demands for space exploration applications.

Performance Analysis of the Low-Temperature Solar-Boosted Power Generation System—Part I: Comparison Between Kalina Solar System and Rankine Solar System

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Faming Sun ◽  
Yasuyuki Ikegami ◽  
Hirofumi Arima ◽  
Weisheng Zhou
Keyword(s):  
Power Generation ◽  
Solar System ◽  
Low Temperature ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Operating Conditions ◽  
Kalina Cycle ◽  
Solar Systems

On the base of the two classical thermodynamic cycles (Kalina cycle and Rankine cycle), solar-boosted Kalina system (Kalina solar system) and solar-boosted Rankine system (Rankine solar system) with traditional nonconcentrating flat plate solar collector (FPSC) and evacuated tube solar collector (ETSC) are investigated in the present paper. The proposed solar systems are considered to be the hybrid of power generation subcycle and solar collector subcycle. Their electricity generating performances are compared under their respective optimal operating conditions to clarify which one is more competitive in solar utilization. Results show that ETSC is the better choice for the both solar systems. Further, the performance comparison shows that the low-temperature solar energy utilized in Kalina cycle is predominant to generate electricity. Meanwhile, the study also find that mass flow rate of the power generation subcycle, mass flow rate of the solar collector subcycle, mass fraction of ammonia and the regenerator performance are important operational parameters for high performance of the Kalina solar system. Finally, with the aid of the weather conditions of Kumejima Island in Japan, the perceptual knowledge for Kalina solar system by using an application case is shown in the paper.

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