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 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 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 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.

Experimental Research of Photovoltaic/Thermal (PV/T) Solar Systems

2013 ◽  
Vol 401-403 ◽  
pp. 146-150
Author(s):  
Yong Tai He ◽  
Rui Ming Liu ◽  
Jin Hao Liu
Keyword(s):  
Solar System ◽  
Flat Plate ◽  
Rural Families ◽  
Hot Water ◽  
Solar Thermal ◽  
Water Tank ◽  
Average Output ◽  
Solar Systems ◽  
Solar Thermal Collector ◽  
Electricity Power

A novel water photovoltaic/thermal (PV/T) solar system was designed, which consisted of a flat plate solar thermal collector and a flat plate PV/T collector in parallel. The area of flat plate solar thermal collector and PV/T collectors were 2m2, respectively. The performance of PV/T solar system was tested under condition of flat plate PV/T collectors with glass cover. The test results show that the average output electricity power of PV/T solar system was 28.1W in sunny day at 8:27-17:00 (March 8,2013, at Chuxiong city), the water temperature in the water tank insulation with 200L was raised from 18°C to 60°C. The daily useful efficiency of the PV/T solar system reached 46%. The PV/T solar system could meet the basic need of ordinary families to lighting electricity and hot water. The PV/T solar system had high practicality and was suitable for ordinary rural families.

Integrating Decentralized Thermal-Solar Systems in the District Thermal Network

2014 ◽  
Vol 656 ◽  
pp. 242-251 ◽  
Author(s):  
Teodora Melania Şoimoşan ◽  
Raluca Andreea Felseghi ◽  
Călin Ovidiu Safirescu ◽  
Georgiana Dorina Iacob
Keyword(s):  
Solar System ◽  
District Heating ◽  
Thermal System ◽  
Heating Systems ◽  
Solar Systems ◽  
Thermal Network ◽  
District Heating Systems ◽  
Solar Thermal System ◽  
The Impact ◽  
Operating Regimes

The present paper approaches the premises referring to the typologies and operating regimes that characterize district heating systems and that are necessary to efficiently integrate, in the district heating network, the systems that use solar energy to produce thermal energy in a decentralized way. A set of operating simulations were carried on the targeted thermal system during a whole year, for different hydraulic feed-in connection of the solar system and different operating temperatures of the heating agent in the thermal network, in order to quantitatively and qualitatively evaluate the impact of converting a classical thermal system in a hybrid solar-thermal system.

scholarly journals Analysis of Religious Characters and Logical Thinking Skills After Using Solar System Teaching Material Integrated with Islamic Science

2020 ◽  
Vol 1 (2) ◽  
pp. 69-76
Author(s):  
Eka Yulida Fitriani ◽  
Fidia Fibriana
Keyword(s):  
Solar System ◽  
Descriptive Analysis ◽  
Thinking Skills ◽  
Research Data ◽  
Logical Thinking ◽  
Teaching Materials ◽  
Solar Systems ◽  
Post Test ◽  
Islamic Science ◽  
Better Than

This study aims to analyze the religious character and logical thinking skills of students after using solar systems teaching materials integrated with Islamic Science. The type of research used is descriptive analysis with a Post-Test-Only with Non-equivalent Groups research design. The research data were obtained from observation sheets, questionnaire sheets, and posttest. The religious character and students’ logical thinking skills of the experiment class students are better than the control class. Students in the experiment class were superior to the control class. The effect of the correlation of the use of teaching materials on the religious character of the students obtained 79.21%, while the effect of the correlation of the use of teaching materials on students’ logical thinking skills was 38.44%. The study concludes that students’ religious character after using solar system teaching materials integrated Islamic science is dominant in the “very good” category and students’ logical thinking skills after the use of solar system teaching materials integrated Islamic science is dominant in the high category.

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