scholarly journals Airport Railroad Service Kualanamu Elasticity (Airport Railink Service)

2018 ◽  
Vol 2 (1) ◽  
pp. 22-33
Author(s):  
Mariana Diah Puspitasari ◽  
Dedik Tri Istiantara
Keyword(s):  
Travel Time ◽  
The Other ◽  
Demand Elasticity ◽  
Private Company ◽  
Train Station ◽  
Ticket Price ◽  
International Airport ◽  
Link Service ◽  
The Impact ◽  
First Time

In July 25th, 2013 Indonesia for the first time provided rail link service from and to an airport. It particularly was operated from and to Kualanamu International Airport (KNIA), Deli Serdang, North Sumatera, which was also operated for the first time on that date. Managing the airport rail link service, a private company namely PT. Railink basically is the subsidiary company of PT. Angkasa Pura II (Persero) and PT. Kereta Api Indonesia (Persero). The price of train ticket, in fact, is getting higher as time goes by. It is noted that the ticket price has increased from IDR 80K to IDR 100K since January 15th, 2015. Concerning this situation, this study is conducted to investigate the demand elasticity of the airport rail link service from and to Kualanamu International Airport as well as factors in taking the airport rail link. The result of the study reveals that the demand of airport rail link service as the impact of the increasing of the ticket price is inelastic since its value of elasticity reaches -0.38. The other result, moreover, finds six reasons influencing people to go with airport rail link: comfort, punctuality, speed or travel time, practicality, access to train station, and other modes’ tariff.

scholarly journals A place too crowded to study: The impact of student cohort growth on the probability of university dropout

2019 ◽  
Vol 9 (2) ◽  
pp. 189-212
Author(s):  
Andrea Diem ◽  
Stefan C. Wolter
Keyword(s):  
Significant Relationship ◽  
Negative Influence ◽  
The Other ◽  
University System ◽  
Pronounced Increase ◽  
The Us ◽  
University Dropout ◽  
The Impact ◽  
First Time ◽  
Course Of Study

Introduction: This study examines the influence of major fluctuations in the number of students enrolling at university on the probability of dropout or a switch to a different course of study. Findings from the US show that a pronounced increase in student numbers leads to more dropouts. Materials and methods: This article provides an analysis of this relationship for the first time outside the US and for an entire university system. We use administrative data for all the students who started studying at Swiss universities between 1980 and 2001. Results: The results suggest a significant relationship between positive cohort growth and the probability of dropout. A reduction in student numbers, on the other hand, does not increase the probability of persistence. Discussion: Despite the negative influence of a big cohort on the probability of persistence, no statistically significant relationship exists, by contrast, between the change in student numbers and the probability of a student switching to a different course of study.

scholarly journals Collective benefits in traffic during mega events via the use of information technologies

2017 ◽  
Vol 14 (129) ◽  
pp. 20161041 ◽  
Author(s):  
Yanyan Xu ◽  
Marta C. González
Keyword(s):  
Travel Time ◽  
Information Technologies ◽  
Travel Demand ◽  
Collective Good ◽  
Large Cities ◽  
The Public ◽  
The Impact ◽  
First Time ◽  
Integrate Data ◽  
Expected Increase

Information technologies today can inform each of us about the route with the shortest time, but they do not contain incentives to manage travellers such that we all get collective benefits in travel times. To that end we need travel demand estimates and target strategies to reduce the traffic volume from the congested roads during peak hours in a feasible way. During large events, the traffic inconveniences in large cities are unusually high, yet temporary, and the entire population may be more willing to adopt collective recommendations for collective benefits in traffic. In this paper, we integrate, for the first time, big data resources to estimate the impact of events on traffic and propose target strategies for collective good at the urban scale. In the context of the Olympic Games in Rio de Janeiro, we first predict the expected increase in traffic. To that end, we integrate data from mobile phones, Airbnb, Waze and transit information, with game schedules and expected attendance in each venue. Next, we evaluate different route choice scenarios for drivers during the peak hours. Finally, we gather information on the trips that contribute the most to the global congestion which could be redirected from vehicles to transit. Interestingly, we show that (i) following new route alternatives during the event with individual shortest times can save more collective travel time than keeping the routine routes used before the event, uncovering the positive value of information technologies during events; (ii) with only a small proportion of people selected from specific areas switching from driving to public transport, the collective travel time can be reduced to a great extent. Results are presented online for evaluation by the public and policymakers ( www.flows-rio2016.com (last accessed 3 September 2017)).

scholarly journals Bruno Schulz – mistrz, inspirator czy literacki ojciec Jerzego Ficowskiego

2017 ◽  
Vol 16 ◽  
pp. 134-144
Author(s):  
Malwina Wapińska
Keyword(s):  
Paul Ricoeur ◽  
The Other ◽  
Literary Biography ◽  
Harold Bloom ◽  
Other Hand ◽  
Anxiety Of Influence ◽  
Unique Nature ◽  
The Impact ◽  
First Time ◽  
Bruno Schulz

Bruno Schulz – master, inspiration or literary father for Jerzy Ficowski This article explores the artistic relationship between Jerzy Ficowski and Bruno Schulz. For the first time Ficowski came across Schulz’s The Cinnamon Shops in 1942, as a 17 year old adolescent. He remembered that first reading as a moment of epiphany which occurred to be crucial to the whole further Ficowski’s literary biography. The young poet hailed the author of The Cinnamon Shops as his great master, the only one who dared to express the true importance of myth to the artistic imagination in such an unique way. The influence of Schulz’s prose on Ficowski’s poetry was unquestionable. However, this does not mean that Ficowski’s work was secondary to Schulz’s or less original. Jerzy Ficowski, like Schulz, emphasized the importance of childhood and myth in a poet’s imagination. On the other hand, both writers found themselves different ways to express those ideas in artistic way. To analyze the unique nature of artistic relationship between Bruno Schulz and Jerzy Ficowski, I refer to the famous Harold Bloom’s work The Anxiety of Influence. A theory of Poetry.Key words: Jerzy Ficowski; Bruno Schulz; biography; interpretation; fictionalisation; the impact of poetic; Paul Ricoeur; Harold Bloom; psychoanalysis;

Analysis of the dynamic response of a fluid-supported circular elastic plate impacted by a low-velocity projectile

2000 ◽  
Vol 214 (5) ◽  
pp. 719-727 ◽  
Author(s):  
W Huang ◽  
Y Li ◽  
W Chen
Keyword(s):  
Dynamic Response ◽  
Elastic Plate ◽  
Impact Force ◽  
The Other ◽  
Sound Waves ◽  
Low Velocity ◽  
The Impact ◽  
First Time ◽  
Transverse Deflection ◽  
Clamped Edges

In this paper, the dynamic response of a thin circular elastic plate supported by a fluid on one side and impacted by a low-velocity projectile on the other side is analysed for the first time. A semi-analytical method is put forward, a non-linear Volterra integral equation governing the impact force is deduced and a linear numerical method is used to solve the equation and calculate the transverse deflection of the plate. The presence of the fluid not only lowers, on account of increased inertia, the natural frequency of the plate vibrating in vacuum but also dampens its transverse vibration owing to the energy carried off in the form of sound waves. As a numerical example, the transverse deflection of a solid circular plate with clamped edges impacted centrally by a low-velocity sphere and the impact force are computed, and the results are discussed.

scholarly journals The excitation of γ -rays by β -rays

1914 ◽  
Vol 90 (621) ◽  
pp. 521-531 ◽  
Keyword(s):  
Atomic Weight ◽  
Balance Method ◽  
The Other ◽  
Characteristic Radiation ◽  
Definite Evidence ◽  
Radioactive Substances ◽  
Γ Rays ◽  
The Impact ◽  
First Time ◽  
Soft Radiation

The excitation of γ -rays by the impact of β -rays on different substances has been investigated by several observers. The question was first systematically examined by J. A. Gray. He showed that penetrating γ -rays are produced by the β -rays of radium E when they impinge on different materials, the amount of γ -radiation increasing with increase of atomic weight of the material. The particular disposition used in his first experiments was not suitable for the examination of any soft types of radiation which might have been excited, but in later work he showed, for the first time, that characteristic radiations were excited in the case of silver, tin, barium and cerium. Chadwick, using the balance method of Rutherford and Chadwick, examined whether the β -rays from radium B and radium C excite penetrating γ -rays in different kinds of matter. Definite evidence was obtained that an excited radiation amounting to about 0.5 per cent, of the primary γ -radiation is produced. This method, however, was not suitable for the detection of soft characteristic radiations. These general results have recently been confirmed by Starke, using the β -rays from a strong preparation of mesothorium. In previous papers by Rutherford and the author on the analysis of the γ -rays from radioactive substances, it has been shown that the γ -rays emitted by the different products can be separated into groups differing widely in penetrating power. Some of these radiations appear to be characteristic of the elements by which they are emitted and fall into one or other of the series given by Barkla. On the other hand, some of the groups of rays found do not appear to belong to either series. It was further shown in previous work that when radium C is deposited on nickel a soft radiation is given out which is entirely absorbed by 2 mm. of aluminium. This soft radiation was much more readily absorbed than that emitted by radium B, and for which μ = 40 (cm. -1 ), but it was appreciably harder than the characteristic radiation of nickel. Moreover, when radium C was deposited on silver, little, if any, soft radiation appeared to be emitted. It seemed of importance, therefore, to examine in detail the nature of the radiation excited by the β - and γ -rays from radium B and radium C, and to examine the bearing of the results on the type of radiation emitted by different materials on which radium C is deposited.

scholarly journals Minimizing tourist impact on the Argentine Islands ecosystem, Antarctic Peninsula, using visitor site guidelines approach

2021 ◽  
pp. 98-116
Author(s):  
H. Yevchun ◽  
◽  
E. Dykyi ◽  
I. Kozeretska ◽  
A. Fedchuk ◽  
...  
Keyword(s):  
Environmental Impact ◽  
The Other ◽  
Deschampsia Antarctica ◽  
Central Values ◽  
Antarctic Research ◽  
Key Features ◽  
Critical Requirement ◽  
The Antarctic ◽  
The Impact ◽  
First Time

There has been an ongoing increase in tourist visits to the Antarctic since 2010. These visits primarily concentrate on a small number of sites, increasing the possible environmental impact. One of the tourism hotspots is the central Argentine Islands in Wilhelm Archipelago. These islands, being one of the top 20 most visited Antarctic sites, consist of Galindez Island, Winter Island, and Skua Island. They are known for wildlife, rich vegetation (old moss banks, rich bryophyte and lichen communities, Antarctic pearlwort Colobanthus quitensis and hairgrass Deschampsia antarctica populations), spectacular views. They include one of the oldest Antarctic research stations: the Ukrainian Antarctic Akademik Vernadsky station. Previously no measures have been developed to minimize the impact of tourism on this region. Thus, the Visitor Site Guidelines (VSG) approach and the numerous studies in the region were used to determine the central values of this site and to identify those key features that can be opened for tourists. In addition to the most frequently mentioned values, such as seabirds and mammals, we considered it necessary to mention the vegetation. We assessed threats to these values, distinguishing known and potential impacts. We have also analyzed and developed landing requirements for the studied area, including the most critical requirement to be considered, namely the number of visitors. We think that the maximum number of visitors should be 36 at any time and 270 per day, not counting passengers of yachts. This is the first time that the Visitor Site Guidelines were modified to limit the number of yachts visiting the site to three yachts per day. To reduce the tourist load at the station itself and at the same time to concentrate tourists in the studied region, we proposed two tourist trails: one for Galindez Island, the other — the existing trail for Winter Island. The prepared draft of Visitor Site Guidelines is given in Appendix 2.

Modeling Arrival Flight Times within the Terminal Airspace

2021 ◽  
pp. 036119812110114
Author(s):  
Osama Alsalous ◽  
Susan Hotle
Keyword(s):  
United States ◽  
Travel Time ◽  
The United States ◽  
Time Of Day ◽  
Civil Aviation ◽  
Weather Data ◽  
Travel Times ◽  
International Airport ◽  
Area Of Interest ◽  
The Impact

Air traffic management efficiency in the descent phase of flights is a key area of interest in aviation research for the United States, Europe, and recently other parts of the world. The efficiency of arrival travel times within the terminal airspace is one of nineteen key performance indicators defined by the Federal Aviation Administration (FAA) and the International Civil Aviation Organization, typically within 100 nmi of arrival airports. This study models the relationship between travel time within the terminal airspace and contributing factors using a multivariate log-linear model to quantify the impact that these factors have on the total travel time within the last 100 nmi. The results were compared with the baseline set of variables that are currently used for benchmarking at the FAA. The analyzed data included flight and weather data from January 1, 2018 to March 31, 2018 for five airports in the United States: Chicago O’Hare International Airport, Hartsfield-Jackson Atlanta International, San Francisco International Airport, John F. Kennedy International Airport, and LaGuardia Airport. The modeling results showed that there is a significant improvement in prediction accuracy of travel times compared with the baseline methodology when additional factors, such as wind, meteorological conditions, demand and capacity, ground delay programs, market distance, time of day, and day of week, are included. Root mean squared error values from out-of-sample testing were used to measure the accuracy of the estimated models.

scholarly journals Impact of the COVID-19 pandemic in the MR availability for iron overloaded patients

2021 ◽  
Vol 22 (Supplement_2) ◽  
Author(s):  
A Pepe ◽  
L Pistoia ◽  
G Restaino ◽  
A Vallone ◽  
R Righi ◽  
...  
Keyword(s):  
Iron Overload ◽  
Negative Impact ◽  
Vertical Axis ◽  
Healthcare Services ◽  
The Other ◽  
Private Company ◽  
Significant Drop ◽  
Mri Scans ◽  
The Impact ◽  
T2 Mri

Abstract Funding Acknowledgements Type of funding sources: Private company. Main funding source(s): The E-MIOT project receives “no-profit support” from industrial sponsorships (Chiesi Farmaceutici S.p.A. and Bayer). Background The T2* magnetic resonance imaging (MRI) technique for the noninvasive quantification of iron overload has significantly improved the survival of patients with hemoglobinopathies by tailoring the chelation therapy. In Italy, the E-MIOT (Extension-Myocardial Iron Overload in Thalassemia) Network, a collaborative project among MRI and hematological centers, has assured high-quality quantification of iron in vital organs such as heart, liver, and pancreas. The COVID-19 pandemic has disrupted healthcare services around the world, also leading to postpone  or delete deferable diagnostic evaluations. Aim   We evaluated the impact of the COVID-19 pandemic on MRI services for iron overload quantification in Italy. Methods The activity of the MRI centers of the E-MIOT Network in the year 2020 was compared to the activity in the same months of 2019. A specific survey was filled out by the MRI operators to evaluate if the availability of MRI slots for patients with hemoglobinothies was reduced and the reasons. Results In comparison with the year 2019, in 2020 there was a significant reduction in the number of T2* MRIs performed (350 vs 656; P < 0.0001). The comparison month by month between the two years highlighted a marked decline (86.9%) in the four-month period March-June 2020, a reduction in the gap between the two years in the three-month period July-September, and a new decline (41.4%) in the three-month period October-December (Figure 1). No patient with hemoglobinopathy could undergo an MRI scan during the Italian lockdown (9 March-10 May 2020). Figure 2 shows the percentage of  decline (year 2020 vs 2019) in the number of T2*MRI scans for each MRI center. If no decline or an increase were present, the vertical axis was set at 0. All centers experienced a significant drop in the number of the T2* MRIs in the four-month period March-June (from 75 to 100%). In the three-month period July-September only the centers of Pisa and Taranto dropped the number of T2* MRIs due to the rescheduling of the other MRI appointments deleted during the lockdown. In the three-month period October-December a reduction of the T2* MRI scans was experienced by all centers, except for Campobasso. In the centers of Ferrara and Lamezia Terme the reduction was the consequence of the general reduction in the number of the total MRIs scheduled per day for the  sanitation procedures. In the other centers, the availability for T2* MRI scans was unchanged in comparison to 2019, but the patients refused the MRI follow up for fear of getting sick of COVID. Conclusion The COVID-19 pandemic is having a strong negative impact on the quantification of iron overload by MRI, which may seriously worsen the prognosis of patients with hemoglobinopathies. Strategies to ensure proved lifesaving MRI exam and to reassure patients about the health safety of the hospitals are recommended. Abstract Figure 1Abstract Figure 2

scholarly journals Redshifted 21-cm bispectrum – II. Impact of the spin temperature fluctuations and redshift space distortions on the signal from the Cosmic Dawn

2021 ◽  
Vol 502 (3) ◽  
pp. 3800-3813
Author(s):  
Mohd Kamran ◽  
Raghunath Ghara ◽  
Suman Majumdar ◽  
Rajesh Mondal ◽  
Garrelt Mellema ◽  
...  
Keyword(s):  
Temperature Fluctuations ◽  
Source Model ◽  
The Other ◽  
Spin Temperature ◽  
Sign Reversal ◽  
X Ray ◽  
Simulated Signal ◽  
Source Models ◽  
The Impact ◽  
First Time

ABSTRACT We present a study of the 21-cm signal bispectrum (which quantifies the non-Gaussianity in the signal) from the Cosmic Dawn (CD). For our analysis, we have simulated the 21-cm signal using radiative transfer code grizzly, while considering two types of sources (mini-QSOs and HMXBs) for Ly α coupling and the X-ray heating of the IGM. Using this simulated signal, we have, for the first time, estimated the CD 21-cm bispectra for all unique k-triangles and for a range of k modes. We observe that the redshift evolution of the bispectrum magnitude and sign follow a generic trend for both source models. However, the redshifts at which the bispectrum magnitude reaches their maximum and minimum values and show their sign reversal depends on the source model. When the Ly α coupling and the X-ray heating of the IGM occur simultaneously, we observe two consecutive sign reversals in the bispectra for small k-triangles (irrespective of the source models). One arising at the beginning of the IGM heating and the other at the end of Ly α-coupling saturation. This feature can be used in principle to constrain the CD history and/or to identify the specific CD scenarios. We also quantify the impact of the spin temperature (TS) fluctuations on the bispectra. We find that TS fluctuations have maximum impact on the bispectrum magnitude for small k-triangles and at the stage when Ly α coupling reaches saturation. Furthermore, we are also the first to quantify the impact of redshift space distortions (RSD), on the CD bispectra. We find that the impact of RSD on the CD 21-cm bispectra is significant ($\gt 20{{\ \rm per\ cent}}$) and the level depends on the stages of the CD and the k-triangles for which the bispectra are being estimated.

scholarly journals Effect of positive and negative interface trap charges on the performance of M-FinFET and its RF/linearity analysis

2021 ◽  
Author(s):  
Rinku Rani Das ◽  
Atanu Chowdhury ◽  
Apurba Chakroborty ◽  
Santanu Maity
Keyword(s):  
Semiconductor Device ◽  
Cmos Technology ◽  
The Other ◽  
Interface Trap ◽  
Trap Concentration ◽  
Device Efficiency ◽  
The Impact ◽  
First Time ◽  
Intrinsic Gain ◽  
Trap Charges

Abstract Multiple Fins structured FinFET (M-FinFET) is a promising semiconductor device for future improvisation of CMOS technology. In this paper, we investigate the impact of interface trap charges (positive and negative trap) at the HfO2/Si interface in M-FinFET for the first time. The various important DC attributes, RF/analog, and linearity metrics are studied in presence and absence of traps. Simultaneously, the various trap concentration effect on the characteristics of M-FinFET are also observed. The results show that the introduction of interface trap charges (ITC) has optimized the ON current, OFF current, and also improves sub-threshold swing (SS) characteristics as compared to no trap condition. It is observed that positive trap having trap concentration of 1012/cm2 enhances the ION ~5.14x, SS by 44.75%, and various important RF/analog parameter such as transconductance (Gm) improves by a factor 5, device efficiency by 7.4% and intrinsic gain (Av) 80.4%. On the other hand, linearity parameters like VIP2, VIP3 and 1 dB compression point show better performance in presence of positive and negative trap.

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