bluuebunny/crossref_metadata_2025 huggingface dataset:
MAKNA ROHANI DALAM EKSEGESIS PRA-MODERN: Sebuah Pengantar Kepada Teologi Eksegesis Henri de Lubac
Authors: Edy Jhon Piter Gurning
Published: October 2020

Abstrak: Dalam 25 tahun terakhir ini, Theological Interpretation of Scripture (TIS) berkembang dan menjadi pokok diskusi para sarjana biblika dan teologi sistematika. Sebagai sebuah cara untuk memahami Alkitab, TIS mengapresiasi metode hermeneutika pra-modern. Bertentangan dengan pemahaman modern bahwa hanya ada satu makna dalam teks, para pendukung TIS mempercayai ada banyak level makna dalam teks Alkitab. Penulis akan berargumentasi untuk membuktikan kebenaran argumen akan adanya banyak level makna dalam teks Alkitab dengan menelusuri pemikiran Henri de Lubac.  

 

Abstract: In the last 25 years, Theological Interpretation of Scripture (TIS) has developed and become the subject of discussion of scholars of biblical and systematic theology. As a way to understand the Bible, TIS appreciates the pre-modern hermeneutics method. Contrary to the modern understanding that there is only one meaning in the text, TIS supporters believe there are many levels of meaning in the biblical text. The author will argue for the existence of many levels of meaning in the biblical text by tracing Henri de Lubac's thoughts.
ANALISIS REPURCHASE BEHAVIOR PADA CHANDRA SUPERSTORE TANJUNG KARANG
Authors: Yulianto Benediktus Tedi , Amr Ardiyansyah
Published: October 2020

This Research aims to find how much influence between the perceptions of prices byconsumers on consumer repurchase behavior. In this study analyze the problems and prove thehypothesis by using the method of observation with quantitative approach survey, the data used isprimary data is data that researchers obtain directly in the field. The result of significant level shows50,53% and based on calculation of coefficient of determination (R2) is relatively small that is equal to0,207. Means that price perceptions affect 20.7% of repurchase behavior.Suggestion of improvement, regarding the clean and neat shopping place, to be repaired sothat consumers feel satisfied with the perception of quality received in accordance with the cost incurredin shopping at Chandra Superstore Tanjung Karang Bandar Lampung.Suggested improvements,enhance the reputation of shopping facilities that make consumers more comfortable shopping that willmake consumers more often re-shop at Chandra Superstore Tanjung Karang Bandar Lampung and rechoose a strategic location in the development.
PENGARUH FLEXTIME TERHADAP JUMLAH PESANAN GOJEK DI KOTA BANDAR LAMPUNG
Authors: Suyarti Sri , Aprilianto Yakub
Published: October 2020

Online transportation is public transportation that is commonly used but can be operated onlineboth for ordering and payment. Flextime is a system of regulating working hours that gives morefreedom to employees that choosing work hour according to their needs. The application of flexibleworking hours greatly facilitates the driver in doing work; with this the consumer is facilitated to useGojek facilities.Based on the calculation, the effect of flextime variable (X) on the order quantity (Y) is 40.1%,and 59.9% is influenced by other factors. The results of the T test t count> t table (8,347> 1,645) meansthat there is a flextime effect on the number of orders in Gojek Bandar Lampung.
PENGARUH HARGA TERHADAP KEPUTUSAN PEMBELIAN KONSUMEN PD. KOPI KUDA BANDAR LAMPUNG
Authors: Dharmat Tilaar Andy Fitriyadi
Published: October 2020

Consumer perception of the same product or brand does not necessarily produce the samerating because not all consumers have complete knowledge of the condition of the product. Therefore,to be able to provide superior value to consumers and be able to calm competition, the company mustknow the consumer's judgment or perception of the competitor's product or brand, so that consumerpreferences can be known for prices based on consumer perception.In this research the consumer's decision to buy a product is based on the price. So from thatprice has a strong factor on the purchasing decision of a product. Related to this problem, it isnecessary to study the variables that influence it so that efforts can be made to solve the problem of thelow market share of coffee products from the PD Kopi Kuda. Then the research topic taken byresearchers is: "The Influence of Prices on Consumer Purchasing Decisions PD. Kopi Kuda BandarLampung. "The research hypothesis is that there is an effect of Price (X) on Purchasing Decisions (Y)on Kopi Kuda products in Bandar Lampung. This type of research in this paper is an evaluation of Price(X) on Purchase Decisions (Y) of Kopi Kuda ProductsDiscussion of the results of the analysis summary, the image can be interpreted that the pricehas a moderate influence of (62.2%) on the decision to purchase Kopi Kuda products and is significant
PENGARUH JOB INSECURITY, KEPUASAN KERJA, DAN STRES KERJA TERHADAP TURNOVER INTENTION PADA PT BPR ARTHA PRIMA PERKASA PULAU BATAM
Authors: Desvarani Regina , Tamami Sastra
Published: October 2020

The purpose of this study was to determine the effect of Job Insecurity, Job Satisfaction, JobStress on Turnover Intention at PT BPR Artha Prima Perkasa. This study used a quantitative method bydistributing questionnaires to 32 employees who work at PT BPR Artha Prima Perkasa. Samples weretaken by saturated sampling techniques. The data analysis method used is quantitative analysis,namely reliability test and validity test, classic assumption test, T test and F test, coefficient ofdetermination and multiple linear regression analysis.Based on the results of data analysis, it shows that: Job Insecurity variable has a significanteffect on Turnover Intention with T sig value of 0,000 <0,05, job satisfaction variable shows no effect onTurnover Intention with T sig value of 0,624 <0,05 and Job stress has a significant effect on TurnoverIntention with a T sig value of 0,000 <0,05. Based on the F test calculation, together with Job Insecurity,Job Satisfaction, Job Stress has a significant effect on Turnover Intention with F sig 0,000 <0,05.
ANALISIS KINERJA KARYAWAN PT. PUTRA KEDIANGAN PROPERTINDO
Authors: Loka Irianto , - Mahalayati
Published: October 2020

This study is categorized as a census study. The type of data in this study is quantitative ornumerical data. The instrument of this study using questionnaire. Population and sample in thisresearch is all employees of PT. Putra Kediangan Propertindo of 32 employees. Sampling technique inthis study using simple random sampling. Test the validity of the instrument using Confirmatory FactorAnalysis while the reliability test using Alpha Cronbach. Measurers proved to be valid and reliable forresearch instruments. Multiple regression analysis was used to test the hypothesis of this study.The results of research at the level of significance of 5% found that: (1) Job satisfaction has apositive and significant impact on employee performance PT. Putra Kediangan Propertindo, it is shownby the acquisition of t test 2.070 with significance of 0.47. (2) Load work does not significantly affect theperformance of employees of PT. Putra Kediangan Propertindo. This is shown by the acquisition of ttest 0.421 with significance of 0.677. (3) Job satisfaction and workload simultaneously have nosignificant effect on employee performance of Putra Kediangan Propertindo, it is marked from theacquisition of F test obtained F arithmetic 2,152 with significant level (p) 0,134a. The equation ofemployee performance variation determined by job satisfaction and workload is 12,9 percent (R sequare= 0,129). R square number is 0,129 this means equal to 12,9% employee performance influenced byjob satisfaction variable and work load. While the remaining 87.1% influenced by other factors outsidethis research variable.
ANALISIS KINERJA PEGAWAI PADA BADAN PENGELOLAAN KEUANGAN DAN ASET DAERAH KABUPATEN LAMPUNG UTARA
Authors: Dharmat Tilaar Andy Fitriyadi
Published: October 2020

uncover performance issues. It is attracting writers to research and study further by testing andanalyzing the extent to which "The Influence of Leadership Styles and Motivation Work To PerformanceEmployees Dinas Sosial, Tenaga Kerja dan Transmigrasi Kabupaten Lampung Tengah ". Thehypothesis is: Suspected leadership style and work motivation affect the performance of Social ServiceEmployees Manpower and Dinas Sosial, Tenaga Kerja dan Transmigrasi Kabupaten LampungTengah.This research was conducted using survey method. The entire population is in the EmployeeDinas Sosial, Tenaga Kerja dan Transmigrasi Kabupaten Lampung Tengah regency as many as 55people, in which samples were taken using saturated sample. The reliability of the instrument iscalculated by the formula product moment correlation, while the reliability of the instrument is calculatedby the formula Alpha crobach.Results of research leadership style and work motivation affect the performance of Dinas Sosial,Tenaga Kerja dan Transmigrasi Kabupaten Lampung Tengah with a coefficient of determination of43.3% (percent) of the variation of the effect of changes in leadership style and work motivation mayexplain Employee Performance and Dinas Sosial, Tenaga Kerja dan Transmigrasi Kabupaten LampungTengah. Whereas 56.7% (percent) the rest is the influence of variables or other factors outside themodel.
FAKTOR YANG MEMPENGARUHI KECURANGAN LAPORAN KEUANGAN DENGAN PERSPEKTIF FRAUD TRIANGLE (Studi Empiris pada Perusahaan Property, Real Estate dan Building Construction)
Authors: Suharsana Yohannes , Prisiena Chatarina
Published: October 2020

This research is to analyzed influence of variable pressure which proxied by financial stability,external pressure, and financial target, and then variable opportunity which proxied by nature ofindustry, ineffective monitoring, and variable razionalization which proxied by auditor change withfraudulent financial statement which measured with fraud score model (F-Score).The sample used in this research are 26 companies of property, real estate, and buildingconstruction sector that listed in Indonesian Stock Exchange on the period 2011 to 2015. The type datathat used are secondary data, from the annual reports of companies sample.The result of this statistical research showed that the variables of financial stability thatmeasured with change in total asset ratio, financial target variable that measured with ROA (return onassets), and nature of industry variable that measured with the change in receivables ratio has positiveinfluence on the fraudulent financial statement. The research does not prove that external pressurevariable which measured with leverage ratio, ineffective monitoring variable which measured with thepercentage of board members who are outside members, and change auditor which measure withdummy variable has an influence on the fraudulent financial statement.
ANALISIS PENJUALAN CABLE SUPREME PADA PT. SUMBER MAKMUR ADIPRAYOGA
Authors: Kumagaya Yohannes P , Debora Veronika
Published: October 2020

This research aims to know the effect of price and product quality towards sales volume ofcable supreme in PT. Sumber Makmur Adiprayoga. The population that used in this study is 250customers of PT. Sumber Makmur Adiprayoga, and a sample is 100 respondents. Data collectiontechniques in this study was done by conducting interviews, observations, and distributingquestionnaires. Data analysis technique in this study used multiple linier regression, coefficients ofdetermination (R2), T-test, and F-test by using SPSS (Statistical Program and Service Solution) version20.0.Based on the results, the partial test (T-test) obtained t-count of price towards sales volume is6,334 greater than t-table of 1,984 and t-count of quality product towards sales volume is 8,907 greaterthan t-table of 1,984. Based on simultaneous testing (F-test) is f-count of 106,155 greater than f-table of3,09 then it can be concluded price and product quality has significant effect towards volume of cablesupreme in PT. Sumber Makmur Adiprayoga. Result of the coefficients determination (R2) is 0,686indicated that sales volume are influenced by the price and product quality of 68,6% , while the rest of31,4% are influenced by other factors.Based on the conclusions, the suggestion in this research is PT. Sumber Makmur Adiprayogamust provide discounts customers, examine the quality of Cable Supreme products, by improving theaesthetics and reliability of the product, and review the price and quality of products to achieve salesvolume target.
ANALISIS KINERJA KINERJA PEGAWAI GURU SD NEGERI 2 SUMBER JAYA KECAMATAN WAWAY KARYA KABUPATEN LAMPUNG TIMUR
Authors: DharmaTilaar Andy Fitriyadi
Published: October 2020

Guidance by the principal in the employees, especially on SD Negeri 2 Sumber Jaya Kecamatan Waway Karya Kabupaten Lampung Timurhas been regulated in the Act, Rules and Regulations Regional Government and its implementation, but many still encountered obstacles that cause problems with various effects in order to apply principles Work Motivation principle, in order to improve employee performance such as teacher discipline, dedication, loyalty, and others. It attracted writers for further research and study a research topic "Effects of Leadership Style and Work Motivation Against Employee Performance on SD Negeri 2 Sumber Jaya Kecamatan Waway Karya Kabupaten Lampung Timur". The focus of research on leadership, motivation Work, and employee performance.This research was conducted using a survey method. The population is All staff of 30 people, in which samples were taken using saturated sample. The reliability of the instruments is calculated by the formula product moment correlation, while the reliability of the instruments is calculated by the formula Alpha crobach, and using multiple regression analysisThe result showed leadership style and work motivation have a great influence (97.2%) on employee performance with variable work motivation as the dominant variable affecting employee performance with the effect of (96.2%) but can not eliminate the variable leadership style despite having contributed negatively due valid.
ANALISIS KONFLIKPEGAWAI PADA BAGIAN UMUM DAN PERLENGKAPANSEKRETARIAT DAERAH KABUPATENLAMPUNG TIMUR
Authors: - Suwandi , Magdalena Betty
Published: October 2020

Leadership is an important part of management, because leaders must plan and organize the people they lead to achieve the goals set in a participatory manner.At the stage of correlation analysis between autocratic leadership style independent variables (X) and employee conflict dependent variables (Y), the correlation coefficient between the two variables is 0.613, which means there is a strong relationship between autocratic leadership style independent variables (X) and employee conflict dependent variables (Y) in the General Section and Equipment of the Regional Secretariat of East Lampung Regency.
PENGARUH IKLAN KATALOG TERHADAP KEPUTUSAN PEMBELIAN DI INDOMARET SINDANGSARI TANJUNG BINTANG
Authors: Febriana Sidabalok Anastasia , Andriyani Elysabet
Published: October 2020

This study belongs to a quantitative research which aims to d the effect of catalog advertisement towards buying decision on Indomaret in Sindangsari Tanjung Bintang. The problem of this study is how the catalog advertisement can influence purchasing decisions made by consumers.The subject in this study is consumers at Indomaret Sindangsari Tanjung Bintang that consisting of 39 men and 69 women. The instrument used in this research is a questionnaire that sourcedfrom variable operational development. The research instrument amounted to 100 items with a determination coefficient of 0,573. Thus, it can be conclude that catalog advertisement has a significant effect on purchasing decisions.This study produced the regression equation that positively valued at Y = 2,242 + 0,766X. R square shows a number 0,573 it means advertisement catalog affect the purchasing decision as much as 57.3 % and the rest are influenced by other factors. The results of the T test show a calculated value of 11.466 greater than 0, 196 which means that Ho is rejected and Ha is accepted. This states that catalog advertisement variables influence the purchasing decisions.
PENGARUH KOMPETENSI DAN DISIPLIN KERJA TERHADAP KINERJA PEGAWAIPADA DINAS PERHUBUNGAN KABUPATEN LAMPUNG SELATAN
Authors: - Kuswarak
Published: October 2020

Work discipline is very necessary to be applied to a government institution. Because by applying the provisions set by the organization whose form of regulation will direct employees to act according to the wishes of the organization. The purpose of this study is to find out the Effect of Work Discipline andWork Competence on Employee Performance at the South Lampung District Transportation Service to the population as respondents. Methods of collecting data as primary data through observation, interview and questionnaire and secondary data.Based on the regression equation the results of hypothesis testing have proven that there is an influence between work discipline and employee performance. testing the work motivation hypothesis shows the value of t count of -0.243 with a significance level of 0.720. The significance level is greater than 0.05, which means that the hypothesis in this study accepts Ho and rejects Ha. Thus it can mean that the H1 hypothesis "work discipline" does not have a positive influence on Employee Performance "rejected.The results ofhypothesis testing have proven that there is an influence between work motivation and employee performance. The test proves that the results of testing the work motivation hypothesis show the value of t count of 4.505 with a significance level of 0,000. The significance level of the result of 0,000 is smaller than 0.05, which means that the hypothesis in this study accepts Ha and rejects Ho. Thus it can mean that the H2 hypothesis "work motivation has a positive effect on employee performance" is accepted.
PENGARUH KOMPETENSI DAN PENGALAMAN KERJA TERHADAP KUALITAS SUMBER DAYA MANUSIA: STUDI KASUS PERUM DAMRI
Authors: Lilyana Besti
Published: October 2020

Damri Lampung Public Company is a company located on Jalan Captain Abdul Haq No.  28, Bandar Lampung which was established as a Public Transportation Bus company within the City and between Cities or Provinces.  In Damri Lampung Public Company, several problems occur including: lack of motivation, personal character problems, self-concept problems, lack of knowledge and skills.  The aim of this research is to determine the effect of Competency and Work experience simultaneously and partially on the Quality of HR. With a total of 118 respondents, this research uses multiple linear regression analysis methods. To determine the effect of the independent variable partially on the dependent variable, the t test is used.  Whereas to determine the effect of the dependent variable simultaneously, the F-test is used. The analysis technique uses SPSS 16.0.  The results of multiple linear regression analysis show that the t-count is 1.768 while the F-test show a value of 105.349 with the R square value in this research is 0.647 or 64.7%.  The results of this research indicate that competency and work experience have a significant effect on the quality of human resources.

Keywords: Competencies, Work Experience, Human Resources Quality

 

Perusahaan Umum Damri Lampung merupakan perusahaan yang berlokasi di jalan Kapten Abdul Haq No. 28, Bandar Lampung  didirikan sebagai  perusahaan  Bus Angkutan Umum dalam Kota dan antar Kota atau Provinsi. Di Perusahaan Umum Damri Lampung terjadi beberapa permasalahan diantaranya: motivasi yang kurang, masalah karakter pribadi, masalah konsep diri, minimnya pengetahuan dan keterampilan yang kurang. Tujuan penelitian ini adalah untuk mengetahui pengaruh Kompetensi dan Pengalaman kerja secara simultan dan parsial terhadap Kualitas SDM. Dengan jumlah responden sebanyak 118 orang karyawan. Penelitian ini menggunakan metode analisis regresi linier berganda. Untuk mengetahui pengaruh variabel independen terhadap variabel dependen secara parsial, digunakan uji t. Sedangkan untuk mengetahui pengaruh variabel dependen secara simultan, digunakan uji-F. Analisis menggunakan SPSS 16.0,. Hasil analisis regresi linier berganda diperoleh bahwa t-hitung adalah 1,768 sedangkan uji-F diperoleh nilai sebesar 105,349 dengan nilai R square pada penelitian ini adalah 0,647 atau 64,7 %. Hasil penelitian ini menunjukkan bahwa Kompetensi dan Pengalaman kerja berpengaruh signifikan terhadap Kualitas SDM.

Kata kunci: Kompetensi, Pengalaman Kerja, Kualitas SDM
Numerical Study of Characteristics of Underexpanded Supersonic Jet
Authors: Murugesan Priyadharshini , Kumar Arjun Biju , Kambhampati Akhil Teja , Pillai Shashank , Chandrasekar Girish Chandar , Raghavannambiar Srikrishnan Ambattu , Velamati Ratna Kishore
Published: October 2020

Correlations for the supersonic jet characteristics, the mean shock cell length and the supersonic core length, have been obtained in terms of the jet parameters. The jet parameters considered in this study are the exit diameter of the nozzle (de), the design Mach number (Me), the nozzle pressure ratio (NPR) and the ratio of specific heats of the medium (γ). The parameters were varied as follows: exit diameters, from 0.5 to 25 mm; Mach number from 1 to 3; the NPR from 2.14 to 35. Initially, working fluid used is cold air and then effect of variation of γ is taken into consideration. The computational model has been validated and then used for all the numerical simulations. A quadratic fit for both characteristics has been obtained which is applicable to any supersonic jet. The correlations developed are valid within the respective ranges of the parameters stated above.
Numerical Investigation on Aerodynamic Performance of Bird’s Airfoils
Authors: Omar Ashraf , Rahuma Rania , Emhemmed Abdulhaq
Published: October 2020

In this work, the aerodynamic performance of four types of bird’s airfoils (eagle, stork, hawk, and albatross) at low Reynolds number and a range of angles of attack during fixed (unflapping) gliding flight was numerically investigated utilizing open-source computational fluid dynamics (CFD) code Stanford University unstructured (SU2) and K-ω Shear Stress Transport (K-ω SST) turbulence model. The flow of the simulated cases was assumed to be incompressible, viscous, and steady. For verification and comparison, a low Reynolds number man-made Eppler 193’s airfoil was simulated. The results revealed that stork has the greatest aerodynamic efficiency followed by albatross and eagle. However, at zero angle of attack, the albatross aerodynamic efficiency exceeded all the other birds by a significant amount. In terms of aerodynamics efficiency, stork’s and albatross’s airfoils performed better than Eppler 193 at angles of attack less than 8°, while at a higher angle of attack all studied birds’ airfoils performed better than Eppler 193. The effect of surface permeability was also investigated for the eagle’s airfoil where the permeable surface occupied one-third of the total airfoil surface. Permeability increased the generated lift and the aerodynamic efficiency of the eagle’s airfoil for angles of attack less than 10°. The increase reached 58% for the lift at zero angle of attack. After the specified angle, the permeability had an adverse effect on the flow which may be due to the transition to turbulent ahead of the permeable section.
Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes
Authors: Walters Wendell W. , Song Linlin , Chai Jiajue , Fang Yunting , Colombi Nadia , Hastings Meredith G.
Published: October 2020

Abstract. Vehicle emissions have been identified as an important urban source of ammonia (NH3). However, there are large uncertainties regarding the
contribution of vehicle emissions to urban NH3 budgets, as well as the role of NH3 in spatiotemporal fine particulate matter (PM2.5)
formation and nitrogen (N) deposition patterns. The N stable isotopic composition (δ15N) may be a useful observational constraint
to track NH3 emission sources and chemical processing, but previously reported vehicle δ15N(NH3) emission signatures
have reported a wide range of values, indicating the need for further refinement. Here we have characterized δ15N(NH3)
spatiotemporal variabilities from vehicle plumes in stationary and on-road measurements in the USA and China using an active NH3
collection technique demonstrated to accurately characterize δ15N(NH3) on the order of hourly time resolution. Significant
spatial and temporal δ15N(NH3) variabilities were observed and suggested to be driven by vehicle fleet composition and
influences from NH3 dry deposition on tunnel surfaces. Overall, a consistent δ15N(NH3) signature of
6.6±2.1 ‰ (x‾±1σ; n=80) was found in fresh vehicle plumes with fleet compositions typical
of urban regions. Our recommended vehicle δ15N(NH3) signature is significantly different from previous reports. This difference
is due to a large and consistent δ15N(NH3) bias of approximately −15.5 ‰ between commonly employed passive
NH3 collection techniques and the laboratory-tested active NH3 collection technique. This work constrains the
δ15N(NH3) urban traffic plume signature, which has important implications for tracking vehicle NH3 in urban-affected
areas and highlights the importance of utilizing verified collection methods for accurately characterizing δ15N(NH3) values.
Development of an Electrical Resistivity Tomography Monitoring Concept for the Svelvik CO2 Field Lab, Norway
Authors: Raab Tobias , Weinzierl Wolfgang , Wiese Bernd , Rippe Dennis , Schmidt-Hattenberger Cornelia
Published: October 2020

Abstract. Within the ERA-NET co-funded ACT project Pre-ACT (Pressure control and conformance management for safe and efficient CO2 storage – Accelerating CCS Technologies), a monitoring concept was established to distinguish between CO2 induced saturation and pore pressure effects. As part of this monitoring concept, geoelectrical cross-hole surveys have been designed and conducted at the Svelvik CO2 Field Lab, located on the Svelvik ridge at the outlet of the Drammensfjord in Norway. The Svelvik CO2 Field Lab has been established in summer 2019, and comprises four newly drilled, 100 m deep monitoring wells, surrounding an existing well used for water and CO2 injection. Each monitoring well was equipped with modern sensing systems including five types of fiber-optic cables, conventional- and capillary pressure monitoring systems, as well as electrode arrays for Electrical Resistivity Tomography (ERT) surveys. With a total of 64 electrodes (16 each per monitoring well), a large number of measurement configurations for the ERT imaging is possible, requiring the performance of the tomography to be investigated beforehand by numerical studies. We combine the free and open-source geophysical modeling library pyGIMLi with Eclipse reservoir modeling to simulate the expected behavior of all cross-well electrode configurations during the CO2 injection experiment. Simulated CO2 saturations are converted to changes in electrical resistivity using Archie's Law. Using a finely meshed resistivity model, we simulate the response of all possible measurement configurations, where always two electrodes are located in two corresponding wells. We select suitable sets of configurations based on different criteria, i.e. the ratio between the measured change in apparent resistivity in relation to the geometric factor and the maximum sensitivity in the target area. The individually selected measurement configurations are tested by inverting the synthetic ERT data on a second coarser mesh. The pre-experimental, numerical results show adequate resolution of the CO2 plume. Since less CO2 was injected during the field experiment than originally modeled, we perform post-experimental tests of the selected configurations for their potential to image the CO2 plume using revised reservoir models and injection volumes. These tests show that detecting the small amount of injected CO2 will likely not be feasible.
DORA: Deployable Optics for Remote sensing Applications
Authors: Capaccioni Fabrizio , Bellucci Giancarlo , Rinaldi Giovanna , Saggin Bortolino , Valnegri Pietro , Filacchione Gianrico , Della Corte Vincenzo , Magrin Demetrio , Angarano Matteo , Filippetto Daniele , Ferraioli Giampaolo , Martellato Elena , Palumbo Pasquale , Rotundi Alessandra
Published: October 2020

The technological developments that led to the miniaturization of satellites, bringing to the market mini (
Shock processing of carbon nanopowder
Authors: Roy Arijit , Surendra Vikram , Ambresh Mallaya , Meka Jaykrishna , Vishakantaiah Jayaram , Chandrasekaran Vijayanand , Bhardwaj Anil , Mason Nigel J , Sivaraman Bhalamurugan
Published: October 2020

Owing to the importance of complex molecules in the Interstellar Medium (ISM), many experiments have been carried out to understand their synthesis in interstellar conditions. Amongst the complex molecules identified Polyaromatic hydrocarbons (PAH) and structured carbon, such as C60/C70, have attracted alot of interest due to their characteristic absorption/emission in the infrared which is believed to explain many of the infrared bands in the ISM [1]. In addition to the PAHs, Mixed Aromatic / Aliphatic Nanoparticles (MAONs) are also proposed to contribute to the spectral signatures that are observed in the ISM [2]. The synthesis of such complex molecules is either via the energetic processing of simple hydrocarbon molecules, a simple bottom-top model, or via a complex route where PAH molecules are synthesized on a graphitized silicon carbide surface, a top-bottom chemical pathway [3]. In the top-bottom model, energetic processing of graphene has been shown to synthesize fullerene (C60) [4] whilst UV processing of arophatic molecules has been shown to synthesize C60 [5]. Another route is irradiation of the icy mantles of interstellar dust for example simple hydrocarbons such as methane subjected to irradiation in a Neon matrix have been observed to synthesize carbon clusters up to C20 [6].  Therefore, there is clearly a demand for more experiments to understand the end products resulting from carbon as the starting material. We employed the high intensity shock tube in PRL to shock the pure (
Rotation periods of asteroids determined from ATLAS photometry
Authors: Durech Josef
Published: October 2020

Asteroid Terrestrial-impact Last Alert System (ATLAS) is an all-sky survey consisting of two Schmidt telescopes located at on Haleakala and Mauna Loa in Hawaii. The telescopes have 65-cm primary mirror, f/2.0, and the field of view is 7.5 deg. They cover the whole visible sky during one night down to ~19 mag with 30 s exposures [1]. Apart from astrometric data, the system also produces photometric measurements that contain information about asteroid rotation. We used ATLAS photometry that was available for approximately 180,000 asteroids observed between 2015 and 2018 to derive asteroid rotation periods. Most of observations were done in orange (560-820 nm) and cyan (420-650 nm) filters. We fitted the data with an ellipsoidal shape model scanning rotation periods between 2 and 1000 hours. For each asteroid, we obtained the best-fit period and corresponding orientation of the spin axis and elongation of the ellipsoidal shape model. However, the best-fit period (corresponding to χ2 minimum in the periodogram) was in most cases just random period that was not reliable because the number of data points was small or the lightcurve amplitude was lost in noise. To test how reliable the determined periods were and how sensitive they were to the actual data sets, we repeated the period scan with many bootstrapped samples of original data and each time derived a new best-fit period. Reliable period determinations had all these periods the same, while unreliable determinations had different periods for different bootstrapped samples. To check a typical rate of false positive solutions, we compared the periodogram results with periods reported in the Lightcurve Database (LCDB) [2] and with an independent analysis of ATLAS data [3]. From roughly 100,000 asteroids with more than hundred individual brightness measurement, we were able to uniquely and reliably determine rotation periods for thousands of them. For other thousands, their periods were likely correct but with less certainty.We present the analysis of correlations between the number of data points and likelihood that the correct period was found. We estimate that by this approach, much larger number of periods can be determined when additional ATLAS or another survey data are available.[1] Tonry, J. L., Denneau, L., Heinze, A. N. et al. (2018): ATLAS: A High-cadence All-sky Survey System, PASP 130(6), 064505.[2] Warner, B. D., Harris, A. W., and Pravec, P. (2009): The asteroid lightcurve database, Icarus 202, 134.[3] Erasmus, N., Navarro-Meza, S., McNeill, A. et al. (2020): Investigating taxonomic diversity within Asteroid Families through ATLAS dual-band photometry, ApJS 247, 13.
Experimental constraints on the onset of planetesimal melting, the formation of primitive achondrites and the distribution of alkali elements in the solar nebula
Authors: Collinet Max , Grove Timothy L.
Published: October 2020

In this presentation, we will summarize the conclusions of three recent articles [1-3] describing partial melting experiments of ordinary and carbonaceous synthetic chondrites (H, LL, CI, CM and CV). The experiments highlight the role of alkali elements on the melting processes of chondritic planetesimals and provide insights into the distribution of “moderately volatile elements” in the early solar system. They were performed at 2–13 MPa (CO pressure) in a Molybdenum-Hafnium Carbide Pressure Vessel. This approach prevented the loss of alkali elements during experiments, a common limitation of previous studies using gas-mixing furnaces.Alkali-rich planetesimals, similar in composition to CI, H and LL chondrites, started to melt at low temperature (1040 ºC) and produced silicate melts with high alkali, SiO2 and Al2O3 contents [1], similar in composition to “trachyandesite achondrites” such as GRA 06128 [4] and ALM-A [5]. In addition, the main groups of primitive achondrites (i.e., brachinites, acapulcoites-lodranites and ureilites), which represent mantle residues, all produced similar low-degree melts (550 samples), represent the residual mantle of a planetesimal that was catastrophically disrupted and quenched while in the process of melting [3]. Our experiments show that the Ureilite Parent Body (UPB) produced a total of 16-24 wt.% silicate melt as small increments (< 5%). Following the extraction of melts rich in SiO2, Al2O3 and alkalis, the residual mantle produced melts poor in alkalis but rich in CaO. The sampled portion of the UPB reached temperatures as high as 1300 ºC, but the rapid extraction of silicate melts preserved primordial heterogeneities in O, C and Cr isotopes as well as in intrinsic fO2.Trachyandesite achondrites, ureilites and other major groups of primitive achondrites were all derived from planetesimals that were initially rich in alkali elements (i.e., not depleted relative to the Sun’s photosphere). They all display nucleosynthetic anomalies characteristic of the inner solar system. Therefore, the depletion of alkalis in other meteorite parent bodies of the inner solar system (e.g., Vesta) likely results from processes that occurred during partial melting. Similarly, the depletion of alkalis in terrestrial planets could result from a secondary loss of alkalis associated with partial melting of the planets building blocks, rather than from the incomplete condensation of the solar nebula.References:[1] Collinet and Grove (2020a), GCA, https://doi.org/10.1016/j.gca.2020.03.005, [2] Collinet and Grove (2020b), GCA, https://doi.org/10.1016/j.gca.2020.03.004, [3] Collinet and Grove (2020c), MAPS, https://doi.org/10.1111/maps.13471, [4] Day et al., (2009), Nature, https://doi.org/10.1038/nature07651, [5] Bischoff et al. (2014), PNAS, https://doi.org/10.1073/pnas.1404799
In Search of X-rays from Uranus
Authors: Dunn William , Ness Jan-Uwe , Lamy Laurent , Tremblay Grant , Branduard-Raymont Graziella , Snios Bradford , Kraft Ralph , Wibisono Affelia , Yao Zhonghua
Published: October 2020

Within the solar system, X-ray emissions have been detected from every planet except the Ice Giants: Uranus and Neptune. Here, we present three Chandra X-ray Observations of Uranus (each 24-30 ks duration): an Advanced CCD Imaging Spectrometer (ACIS) observation during solar maximum on 7 August 2002 and two High Resolution Camera (HRC) observations during solar minimum on 11 and 12 November 2017. The ACIS observation from 2002 shows a low signal but statistically significant detection of X-rays from Uranus. The measured Uranus X-ray fluxes of 10-15-10-16 erg/cm2/s from this detection are consistent with upper limits and modelling predictions in previous work (Ness & Schmidt. 2000; Cravens et al. 2006).  The photon energy distribution from this observation is consistent with an X-ray emission from charge exchange or scattering of solar photons, as observed for Jupiter and Saturn. The two HRC observations from 2017 constitute non-detections. For 11 Nov 2017, the X-ray emission coincident with Uranus’ location is dimmer than 98% of the Field of View. 12 November 2017, was also a non-detection, but with tentative hints of planetary X-ray signatures: Uranus was 4 times brighter than the previous day, and brighter than 94% of the Field of View (1.6 standard deviations > Field of View mean). At this time, the Uranus coincident X-ray signature also exhibited timing variation distinct from the field of view. Further and longer observations will be required to better characterise the nature of the X-ray emissions from Uranus.
Bright spot auroras in Jupiter’s polar region: Juno-UVS observations
Authors: Haewsantati Kamolporn , Bonfond Bertrand , Wannawichian Suwicha , Gladstone George R , Hue Vincent , Versteeg Maarten H , Greathouse Thomas K , Grodent Denis , Yao Zhonghua , Dunn William , Gérard Jean-Claude , Giles Rohini S , Kammer Joshua A , Guo Ruilong , Vogt Marissa F
Published: October 2020

In July of 2016, NASA began a new era in Jupiter exploration by placing the Juno spacecraft and its highly capable suite of scientific instrumentation in a polar orbit about Jupiter. It was a unique opportunity to study Jupiter’s auroras in great details with the Ultraviolet Spectrograph (UVS) instrument during the first 25 perijoves. Here we present a systematic analysis of a newly identified feature of the polar emissions called the auroral bright spot. The bright spots have power ranging from tens to a hundred gigawatts. In a given perijove, bright spot reoccurs at almost the same system III (SIII) position within a time interval of a few to tens of minutes. Furthermore, we found a brightness quasiperiodicity of 22-28 minutes in the southern bright spots observed during perijove 4 and perijove 16. The northern bright spots locate in a confined region, near 175° SIII longitude and 65 degrees latitude, while the southern spots scatter randomly around the pole. The bright spots’ positions reported here are usually located on the edge of the swirl region (the polar-most region of Jupiter’s auroras). This feature is observed at all magnetic local times rather than being confined to the noon sector. Therefore, the bright spot is incompatible with the auroral signature of Earth-like Sun-facing cusp, as proposed in earlier works. However, due to Jupiter's rapid rotation with respect to the size of the magnetosphere, the topology of the cusp region at Jupiter is expected to be considerably complicated by the twisting of the field lines. Hence, we cannot conclude whether the bright spot is related to the Jovian cusp processes yet. Finally, we also have identified time intervals during which Juno flew through the field lines connected to the bright spot allowing further investigations of the associated particles and responsible processes.
Potential Flyby Targets for the ESA Hera Mission
Authors: Fitzsimmons Alan , Khan Michael , Küppers Michael , Michel Patrick , Pravec Petr
Published: October 2020

The Hera mission is the planetary defence mission approved under the ESA Space Safety Programme. Together with the NASA DART mission, it is the first Asteroid Deflection Demonstration. DART will impact Dimorphos, the natural satellite of Near Earth Asteroid Didymos, in 2022. Using the kinetic impactor technology, it will demonstrate the ability to change the trajectory of a small asteroid. Hera will launch in 2024 and arrive in the Didymos system at the end of 2026. Its primary goals are to accurately measure the mass of Dimorphos and to characterise the crater and effect of the DART impact on this small asteroid.Hera will spend over 2 years matching orbits with Didymos, travelling through near-Earth space and the inner main-belt. This potentially allows Hera to perform an additional asteroid flyby enroute to Didymos.  For such a flyby, a number of factors need to be considered for target selection. Primary factors are the accuracy of the orbit of the asteroid, and distance from the nominal trajectory. Resolution of geomorphology requires a minimum number of spatial resolution elements at the desired flyby distance.  Previous observations on the form of lightcurves, colours or spectra are important for flyby science planning. Finally, a dynamical class of asteroid may be targeted for specific science priorities.Analysis of the nominal trajectory shows approximately 100 asteroids passing the nominal position of Hera within 0.02 au. Ten of these potential targets are Near-Earth Asteroids, the rest being Mars-crossers and main-belt asteroids. We will present our current knowledge on these targets, and highlight the highest priority targets for further observation in the next 2-3 years. Although ground-based reconnaissance has started on some targets, further observations are required to support the flyby planning process.Figure 1. Osculating orbital elements of asteroids passing close to Hera on its nominal trajectory to the Didymos system, without any additional trajectory adjustment. Red dots indicate a current flyby distance d < 0.01 au, blue circles indicate a current flyby distance 0.01 au < d < 0.02 au. The solid line indicates a perihelion distance of 1.3 au, asteroids to the left of this line are Near-Earth Asteroids.
CHESS – Constellation of CubeSats: Analyzing the drivers of the Earth’s exosphere with MS and GNSS
Authors: Fausch Rico , Wurz Peter , Rothacher Markus , Martinod Nicolas , Trébaol Tristan , Villegas Alfonso , Corthay François , Joss Marcel , Kneib Jean-Paul , Pazos Nuria
Published: October 2020

Chemical composition and density measurements of the upper atmosphere provide key insights into the origin and evolution of celestial objects. The density and the chemical composition of planet’s atmosphere may evolve from a hostile, dense primary atmosphere to a life‐harbouring tertiary atmosphere as present on Earth by losing atmospheric species to space upon formation of the object. The present-day atmospheric escape rates can be measured or inferred from exospheric temperatures and density profiles, for many species of the upper atmosphere. By modelling, these escape rates can be adapted to conditions in the past to study the evolution of the atmospheric composition.The terrestrial exosphere and upper ionosphere are complex dynamic regions that adapt to several endogenous and exogenous drivers. The Sun as such a driver forces the upper atmosphere to respond to the solar UV/EUV flux and solar energetic particles. These external influences cause a variation of both the density, extent, and the chemical composition of the upper atmosphere on several time scales ranging from minutes to the age of the Solar System leading to various phenomena including atmospheric evolution and night-side transport of species. Although these interactions have been extensively studied over the past decades, the scientific community still lacks some basic measurements in the terrestrial upper atmosphere to derive the exospheric temperatures and its variation as a function of the corresponding drivers.Figure 1: Computer model of the 3U CHESS satellite.Thus, we designed the CHESS mission consisting of two 3U CubeSat-type satellites on different orbits. The science payload of each spacecraft consists of a new generation of dual-frequency GNSS receivers for total air density measurements from drag and total electron content above the satellites and a compact time-of-flight mass spectrometer for in situ measurements of both the chemical composition and density in the upper atmosphere. Enabled by these two novel scientific instruments, the primary goal of the CHESS mission is to record an inventory of the neutral species and ions present at various heights in the exosphere. From these measurements, we will derive numerous atmospheric properties including exospheric temperature profiles, compositional variations of the exosphere, atmospheric escape rates, as function of the external drivers.
Solar wind sputtering on Mercury and the Moon: effects on mid infrared spectra of mineral powder pellet analogues
Authors: Jäggi Noah , Szabo Paul Stefan , Biber Herbert , Mezger Klaus , Aumayr Friedrich , Wurz Peter , Galli André
Published: October 2020

Planet surfaces exposed to high energy plasma undergo surface alteration by sputtering (e.g., [1]). Impinging ions thereby eject particles from the uppermost layers of mineral grains. The effect that sputtering has on surface reflectivity in mid infrared (MIR) is relevant for the interpretation of surface-based spectra as well as future Bepi Colombo MIR spectra. Previous studies have shown that the IR spectrum of a given mixture varies with its porosity, grain size, temperature, emergence angle and mineral to glass ratio [2, 3, 4, 5, 6].This study uses the mineral diopside (CaMgSi2O6), enstatite (Mg2Si2O6), wollastonite (Ca2Si2O6), and bytownite (Na0.2Ca0.8Al2Si2O8) as analogues for the surfaces of Moon and Mercury. The minerals were ground to flocculation resulting in mean grain sizes of 20-34 µm and then and pressed into pellets with porosities of about 20 %.  In addition to bulk powder pellets, wollastonite powder fractions of
Studying physics and chemistry in atmospheres of hot Jupiters from future ground-based and space facilities
Authors: Shulyak Denis , Rengel Miriam , Lara Luisa , Nemec Nina
Published: October 2020

Thanks to the advances in modern instrumentation we learned about many exoplanets that spawn a wide range of masses and composition. Studying their atmospheres  provides insight into planetary diversity, origin, evolution, dynamics, and habitability. Present and future observing facilities will address these important topics in very detail by using more precise observations, high-resolution spectroscopy, improved analysis methods, etc. In this contribution we focus on the analysis of temperature and  disequilibrium chemical processes in hot Jupiter atmospheres. In particular, we investigate the impact of photochemistry and vertical transport processes on mixing ratio  profiles and on the simulated spectra of a hot Jupiters that orbits stars of various spectral types. We additionally address the impact of stellar activity that should be present in all stars with convective envelopes. Finally, we estimate the characterization of these processes using space and ground-based observations that will be carried out with near-future instruments and missions.  