bluuebunny/crossref_metadata_2025_split huggingface dataset:
Graphene-based mid-infrared plasmonic isolator with multimode interferometer
Authors: Heidari Mohsen , Ahmadi Vahid 
Published: September 2020

This Letter presents an extremely compact graphene-based plasmonic isolator with a two-port multimode interference (MMI) structure. The proposed structure utilizes the non-reciprocal phase shift effect to provide optical isolation. A new approach is used for MMI-based isolator design in terms of

m

th overall self-imaging. The influence of the device geometries and

m

parameter on the isolation ratio (ISR), insertion loss, operation bandwidth (BW), and required magnetic field strength

B

and its appropriate direction is investigated. The device has an ultra-small footprint compared to the operating wavelength of

λ
=
8

µ

m

with high ISR. An MMI isolator with a size of

0.5

µ

m

×
4.02

µ

m

(

≈

λ
2

/

32

) and

I
S
R

=

18.35

d
B

and an MMI isolator with a size of

0.7

µ

m

×
7.44

µ

m

(

≈

λ
2

/

12

) with

I
S
R

=

27.1

d
B

are achieved. Moreover, the non-reciprocal MMI shows ultra-wide 20 dB isolation BW of 0.75–2.34 THz.
Phenethylamine ligand engineering of red InP quantum dots for improving the efficiency of quantum dot light-emitting diodes
Authors: Jiang Wei , Kim Boram , Chae Heeyeop 
Published: September 2020

In this Letter, red-emitting multi-shelled indium phosphide (InP) quantum dots (QDs) were synthesized using the safe phosphorus precursor tris(dimethylamino)phosphine (

(

D
M
A

)
3

P

). The long-chain ligands of oleylamine (OAm) in the

(

D
M
A

)
3

P

phosphide source-based InP QDs were partially exchanged with short-chain ligands of phenethylamine (PEA) in the core formation process, and the resulting InP QDs were applied to quantum dot light-emitting diodes (QLEDs). The short-chain ligands of PEA with the

π

-conjugated benzene ring improved the charge transport and electrical conduction of the QLEDs with

(

D
M
A

)
3

P

phosphide source-based InP QDs. The PEA-engineering of InP QDs improved their maximum quantum yield from 71% to 85.5% with the full-width at half-maximum of 62 nm. Furthermore, the maximum external quantum efficiency of QLEDs with the PEA-engineered InP QDs improved from 1.9% to 3.5%, and their maximum power efficiency increased from 2.8 to 6.0 lm/W. This Letter demonstrates that engineering the core formation process with the short-chain ligands of PEA provides an efficient and facile way to improve the charge transport and electrical conduction in

(

D
M
A

)
3

P

phosphide source-based InP QLEDs for electroluminescent devices.
Parameters for the Tractrix
Authors: Brell Edward 
Published: September 2020

The tractrix is a curve which tracks the path of a dragged object. On an X-Y graph it will show the co-ordinates of the object where it has been and where it is going. Such a graph is dimensionless but once a dimension is introduced all other dimensional aspects follow. Whether the object is a recalcitrant dog on a leash, a water skier or a log with one end being dragged along the ground, the path followed will be a tractrix shape,
ceteris paribus.
This preprint is intended to show how passage of time is introduced to the functioning tractrix.
Adopting worst-case optimal joins in relational database systems
Authors: Freitag Michael , Bandle Maximilian , Schmidt Tobias , Kemper Alfons , Neumann Thomas 
Published: September 2020

Worst-case optimal join algorithms are attractive from a theoretical point of view, as they offer asymptotically better runtime than binary joins on certain types of queries. In particular, they avoid enumerating large intermediate results by processing multiple input relations in a single multi-way join. However, existing implementations incur a sizable overhead in practice, primarily since they rely on suitable ordered index structures on their input. Systems that support worst-case optimal joins often focus on a specific problem domain, such as read-only graph analytic queries, where extensive precomputation allows them to mask these costs.
In this paper, we present a comprehensive implementation approach for worst-case optimal joins that is practical within general-purpose relational database management systems supporting both hybrid transactional and analytical workloads. The key component of our approach is a novel hash-based worst-case optimal join algorithm that relies only on data structures that can be built efficiently during query execution. Furthermore, we implement a hybrid query optimizer that intelligently and transparently combines both binary and multi-way joins within the same query plan. We demonstrate that our approach far outperforms existing systems when worst-case optimal joins are beneficial while sacrificing no performance when they are not.
ODIN
Authors: Suprem Abhijit , Arulraj Joy , Pu Calton , Ferreira Joao 
Published: September 2020

Recent advances in computer vision have led to a resurgence of interest in visual data analytics. Researchers are developing systems for effectively and efficiently analyzing visual data at scale. A significant challenge that these systems encounter lies in the drift in real-world visual data. For instance, a model for self-driving vehicles that is not trained on images containing snow does not work well when it encounters them in practice. This drift phenomenon limits the accuracy of models employed for visual data analytics.
In this paper, we present a visual data analytics system, called Odin, that automatically detects and recovers from drift. Odin uses adversarial autoencoders to learn the distribution of high-dimensional images. We present an unsupervised algorithm for detecting drift by comparing the distributions of the given data against that of previously seen data. When Odin detects drift, it invokes a drift recovery algorithm to deploy specialized models tailored towards the novel data points. These specialized models outperform their non-specialized counterpart on accuracy, performance, and memory footprint. Lastly, we present a model selection algorithm for picking an ensemble of best-fit specialized models to process a given input. We evaluate the efficacy and efficiency of Odin on high-resolution dashboard camera videos captured under diverse environments from the Berkeley DeepDrive dataset. We demonstrate that Odin's models deliver 6X higher throughput, 2X higher accuracy, and 6X smaller memory footprint compared to a baseline system without automated drift detection and recovery.
CheetahVIS
Authors: Ning Wentao , Tang Qiandong , Zhao Yi , Yang Chuan , Wang Xiaofeng , Wang Teng , Liu Haotian , Zhang Chaozu , Zhou Zhiyuan , Shen Qiaomu , Tang Bo 
Published: September 2020

Recently, the spatial-temporal data of urban moving objects, e.g., cars and buses, are collected and widely used in urban trajectory exploratory analysis. Urban bus service is one of the most common public transportation services. Urban bus data analysis plays an important role in smart city applications. For example, data analysts in bus companies use the urban bus data to optimize their bus scheduling plan. Map services providers, e.g., Google map, Ten-cent map, take urban bus data into account to improve their service quality (e.g., broadcast road update instantly). Unlike urban moving cars or pedestrians, urban buses travel on known bus routes. The operating buses form the "bus flows" in a city. Efficient analyzing urban bus flows has many challenges, e.g., how to analyze the dynamics of given bus routes? How to help users to identify traffic flow of interests easily?
In this work, we present CheetahVIS, a visual analytical system for efficient massive urban bus data analysis. CheetahVIS builds upon Spark and provides a visual analytical platform for the stakeholders (e.g., city planner, data analysts in bus company) to conduct effective and efficient analytical tasks. In the demonstration, demo visitors will be invited to experience our proposed CheetahVIS system with different urban bus data analytical functions, e.g., bus route analysis, public bus flow overview, multiple region analysis, in a real-world dataset. We also will present a case study, which compares different regions in a city, to demonstrate the effectiveness of CheetahVIS.
PiBench online
Authors: Hao Xiangpeng , Lersch Lucas , Wang Tianzheng , Oukid Ismail 
Published: September 2020

The emergence of persistent memory (PM), such as Intel Optane DC Persistent Memory Modules (DCPMM), opened up many opportunities for building high-performance indexes directly on PM. However, the many PM indexes proposed by prior work had their evaluation based on PM emulation using DRAM and therefore it was not clear how they would perform on real PM hardware. Moreover, they typically used ad hoc, in-house benchmarks and did not collect PM-specific hardware metrics that are key performance indicators and are instrumental for users and developers to understand the performance behavior of PM indexes. These issues call for a systematic, fair and reproducible approach for evaluating PM indexes.
This demonstration highlights the principles and lessons learned from our recent evaluation of PM indexes on real DCPMM and showcases PiBench, a unified benchmarking framework that enables fair and reproducible evaluation of PM indexes. In addition to common metrics, PiBench uniquely integrates monitoring tools to collect PM-specific hardware counters, allowing in-depth performance analysis. Our demonstration is enabled by PiBench Online, a new interactive system built on top of PiBench. Using PiBench Online, users can upload their own index implementations, run preset or customized workloads, and analyze results interactively, all through an easy-to-use web interface. PiBench is open-source and PiBench Online is deployed at https://pibench.org. We hope PiBench Online can promote fair comparison and reproducibility in database and systems communities.
POLARIS
Authors: Aguilar-Saborit Josep , Ramakrishnan Raghu , Srinivasan Krish , Bocksrocker Kevin , Alagiannis Ioannis , Sankara Mahadevan , Shafiei Moe , Blakeley Jose , Dasarathy Girish , Dash Sumeet , Davidovic Lazar , Damjanic Maja , Djunic Slobodan , Djurkic Nemanja , Feddersen Charles , Galindo-Legaria Cesar , Halverson Alan , Kovacevic Milana , Kicovic Nikola , Lukic Goran , Maksimovic Djordje , Manic Ana , Markovic Nikola , Mihic Bosko , Milic Ugljesa , Milojevic Marko , Nayak Tapas , Potocnik Milan , Radic Milos , Radivojevic Bozidar , Rangarajan Srikumar , Ruzic Milan , Simic Milan , Sosic Marko , Stanko Igor , Stikic Maja , Stanojkov Sasa , Stefanovic Vukasin , Sukovic Milos , Tomic Aleksandar , Tomic Dragan , Toscano Steve , Trifunovic Djordje , Vasic Veljko , Verona Tomer , Vujic Aleksandar , Vujic Nikola , Vukovic Marko , Zivanovic Marko 
Published: September 2020

In this paper, we describe the Polaris distributed SQL query engine in Azure Synapse. It is the result of a multi-year project to re-architect the query processing framework in the SQL DW parallel data warehouse service, and addresses two main goals: (i) converge data warehousing and big data workloads, and (ii) separate compute and state for cloud-native execution.
From a customer perspective, these goals translate into many useful features, including the ability to resize live workloads, deliver predictable performance at scale, and to efficiently handle both relational and unstructured data. Achieving these goals required many innovations, including a novel "cell" data abstraction, and flexible, fine-grained, task monitoring and scheduling capable of handling partial query restarts and PB-scale execution. Most importantly, while we develop a completely new scale-out framework, it is fully compatible with T-SQL and leverages decades of investment in the SQL Server single-node runtime and query optimizer. The scalability of the system is highlighted by a 1PB scale run of all 22 TPC-H queries; to our knowledge, this is the first reported run with scale larger than 100TB.
The relational data borg is learning
Authors: Olteanu Dan 
Published: September 2020

This paper overviews an approach that addresses machine learning over relational data as a database problem. This is justified by two observations. First, the input to the learning task is commonly the result of a feature extraction query over the relational data. Second, the learning task requires the computation of group-by aggregates. This approach has been already investigated for a number of supervised and unsupervised learning tasks, including: ridge linear regression, factorisation machines, support vector machines, decision trees, principal component analysis, and k-means; and also for linear algebra over data matrices.
The main message of this work is that the runtime performance of machine learning can be dramatically boosted by a toolbox of techniques that exploit the knowledge of the underlying data. This includes theoretical development on the algebraic, combinatorial, and statistical structure of relational data processing and systems development on code specialisation, low-level computation sharing, and parallelisation. These techniques aim at lowering both the complexity and the constant factors of the learning time.
This work is the outcome of extensive collaboration of the author with colleagues from RelationalAI, in particular Mahmoud Abo Khamis, Molham Aref, Hung Ngo, and XuanLong Nguyen, and from the FDB research project, in particular Ahmet Kara, Milos Nikolic, Maximilian Schleich, Amir Shaikhha, Jakub Závodný, and Haozhe Zhang. The author would also like to thank the members of the FDB project for the figures and examples used in this paper.
The author is grateful for support from industry: Amazon Web Services, Google, Infor, LogicBlox, Microsoft Azure, RelationalAI; and from the funding agencies EPSRC and ERC. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 682588.
Racialization and the national body: (Re)defining selves and others in changing contexts of liberal democratic governance
Authors: Delfino Jennifer B. , Kosse Maureen 
Published: September 2020

Abstract
This introduction argues that understanding the co-construction of race, language, and nation is essential to understanding liberal democratic governance in today's world. Using the theories and methods of raciolinguistics, we argue that voicing and resemiotization are important discursive processes that people use to reconstitute selves and Others in relation to liberal democratic ideas about national belonging. Specifically, we examine how racialized redefinitions of “the body” are central to how right and left-leaning groups alike (re)define nationhood, albeit for different ends. We foreground an intersectional, international approach to understanding the role of language in constructing race and vice versa as well as the role of social media in how differently positioned groups seek empowerment.
Existence of almost periodic solutions to some nonautonomous higher-order stochastic difference equations
Authors: Bezandry Paul H. 
Published: September 2020

Abstract
The paper studies the existence of almost periodic solutions to some nonautonomous higher-order stochastic difference equation of the form:

X

(

t
+
n

)

+

∑

r
=
1

n
-
1

A

r

(
t
)

X

(

t
+
r

)

+

A

0

(
t
)

X

(
t
)

=
f

(

t
,
X

(
t
)

)

,

X\left( {t + n} \right) + \sum\limits_{r = 1}^{n - 1} {{A_r}\left( t \right)X\left( {t + r} \right) + {A_0}\left( t \right)X\left( t \right) = f\left( {t,X\left( t \right)} \right),}

n ∈ 𝕑, by means of discrete dichotomy techniques.
Influence of plutonyl ion on electrochemical characterization of zirconium in plutonium nitrate solutions
Authors: Nakahara Masaumi , Sano Yuichi , Nomura Kazunori 
Published: September 2020

Abstract
With the aim of evaluating the corrosion behavior of a Pu evaporator made from Zr in the Rokkasho Reprocessing Plant (RRP), the electrochemical characterization of Zr was investigated in Pu nitrate solutions. Before and after experiments, spectra of Pu nitrate solutions were recorded, and Pu4+ was oxidized to PuO2
2+ by heating these solutions. The ratio of PuO2
2+ in 3 mol dm−3 HNO3 was higher than that in 7 mol dm−3 HNO3 in our experiments. The maximum open circuit potential of Zr in the Pu nitrate solution was approximately 1 V in the Pu nitrate solution containing 7 mol dm−3 HNO3. However, there were no significant changes at high PuO2
2+ concentrations, and this value remained below the passivity breakdown potential under our experimental conditions. In this study, Zr showed high corrosion resistance, even though many PuO2
2+ ions existed in the Pu nitrate solution containing 7 mol dm−3 HNO3.
Die Massenstabilität des Elektrons
Authors: Bopp Fritz 
Published: September 2020

Abstrakt
Es werden Mindestbedingungen entwickelt, denen eine von der Maxwell sehen Theorie abweichende Elektrodynamik genügen muß, um mit grundlegenden Erfahrungen verträglich zu sein. Insbesondere wird die Bedingung der Massenstabilität untersucht, die in einer Reihe bisher diskutierter Ansätze für die Feldtheorie (von Dirac , Stueckelbergu. d. Verf.) nicht gewahrt ist. Diese Bedingung besagt, daß die mit dem Felde variierende Masse des Elektrons nach Wechselwirkung mit äußeren Kräften wieder ihrem Gleichgewichtswert zustreben soll. Zum Schluß werden verschiedene in der Literatur diskutierten Ansätze zur Abänderung der Maxwell sehen Gleichungen im Lichte der formulierten Bedingungen verglichen und um einen ergänzt, der sämtlichen Bedingungen genügt.
Selektiv-Filterung des Elektrenkephalogramms
Authors: Prast Johannes , Franek Bruno 
Published: September 2020

Abstrakt
Gegenüber den bisherigen Versuchen einer nachträglichen Frequenzanalyse des aufgenommenen EEG wird in dem beschriebenen Verfahren durch selektive, elektrische Filterung jede Einzelfrequenz für sich isoliert und dann aufgezeichnet. Auf diese Weise konnten mehrere, verschiedene Frequenzen ihren quantitativen wie qualitativen Eigenschaften nach unterschieden, und frequenzisolierte, zeitlich und örtlich in Zusammenhang mit dem Reiz stehende Hirnaktionsschwingungen betrachtet werden. Mit der Erschließung höher frequenter Bereiche für die analytische Forschung werden die Feinheiten des EEG erst der Möglichkeit einer Deutung zugeführt.
Über die Anwendung der Neutronendiffusion durch Grenzflächen zur Messung von Wirkungsquerschnitten
Authors: Raether Heinz 
Published: September 2020

Abstrakt
Durchsetzt ein Strom thermischer Neutronen die Trennfläehe zweier Medien, so gilt die Stetigkeit der Normalkomponpnten der Stromdichte
D1 gradx n1= D2 gradx n2

(D Diffusionskoeffizient, n Neutroncndifhte, x Richtung senkrecht zur Trennfläehe). Setzt man D = λv/3 (λ. Streuweglänge und v Geschwindigkeit der Neutronen), so kann nach einem Vorschlag von Heisenberg aus dem Verhältnis der Dichtegradicnten das Verhältnis d)?r Weglängen ermittelt werden. - In der vorliegenden Arbeit wird auf diese Weise das Verhältnis der Streuweglängen thermischer Neutronen in schwerem und leichtem Wasser gemessen. Legt man für den Wasserstoff Wirkungsquerschnitt σH = 45 • 10-24 cm2 zugrunde, so erhält man aus einer größeren Zahl von Messungen des Gradientenverhältnisses bei verschiedenen Versuchsbedingungen einen Deuterium-Wirkungsquersehnitt von 5,6 ± 0,3 • 10-24 cm2. Dieser Wert stimmt mit öd= 5,7 ± 0,14 • 10-24 cm2 überein, wolcher aus Messungen des Absorptionskoeffizienten von D20-Schichten erhalten wurde. Einige für die Diffusion durch Grenzschichten abgeleitete Beziehungen werden bestätigt.
Eine Abscheidungsmethoäe für die bei der Uranspaltung auftretenden Seltenen Erden nach dem Verfahren von Szilard und Chalmers
Authors: Götte Hans 
Published: September 2020

Abstrakt
Die Seltenen Erden .lassen sich mit Hilfe eines Szilard-Chalmers- Verfahrens vom Uran und Uran X trennen. Das UO2 wird als inneres Komplexsalz des Uranyldibenzoylmethans in Lösung gebracht und gehalten. Da das Dibenzoylmethan auch mit den Elementen der 4. Gruppe lösliche und gegen Wasser beständige Komplexe bildet, werden diese Elemente ebenso wie das Uran in organischer Lösung gehalten und nicht mit ausgeschüttelt. Mit Hilfe der geschilderten Abseheidungsmethode wurden ein neues Cer-Isotop von 11 Min. Halbwertszeit und ein sich aus ihm nachbildendes Praseodym von 25 Min. Halbwertszeit aufgefunden. Die ß-Strahlung des gefundenen Praseodyms ist beträchtlich härter als die des Cers. Außerdem wurden kurzlebige Seltene Erd-Isotope von 3 bis 5 Min. Hwz festgestellt.
Trägergranula und Ommochrompigmente in den Augen verschiedener Rassen und Transplantat-Träger . von Ephestia kühniella Z. und Ptychopoda seriata Schrk.
Authors: Hanser Gisela 
Published: September 2020

Abstrakt
Die Ommochromfarbstoffe der Augenpigmente von Ephestia und Ptychopoda sind an Eiweiß-Trägergranula gebunden. Das Corneazellpigment unterscheidet sich von dem der übrigen pigmentierten Ommatidienzellen in der Pigmentkorngröße; an Stelle von Skotommin führt es in den Ephestia-Augen Xanthommin. Durch a wird der Skotommin- und der Xanth- ommingehalt vermindert, durch a+'Stoff-Zufuhr (durch + Implantate oder Kynurenin-Injek- tion) wird er in a-Tieren gesteigert. In den Augen der wa-Ephestien fällt die zur Pigment- bildung notwendige Trägersubstanz aus. Das hellgelbe Pigment der dec-Ptychopoda-Augen färbt sich im kurzwelligen Licht rot aus. Die Fähigkeit zur + -Pigmentbildtjng in a-Augen nach +-Stoff-Zufuhr beginnt und erlischt in den einzelnen Zellelementen zu verschiedenen Zeiten.
Hirnbioelektrische Untersuchungen zur Frage der a-Wellen beim Kaninchen
Authors: Grüttner Reinhold 
Published: September 2020

Abstrakt
Bei Ableitungen von der Hirnrinde (oder genauer von der Dura) des nicht aufgespannten, nicht narkotisierten Kaninchens fanden sich über der ganzen Konvexität gleichartige, regelmäßige, sinusförmige Potentialschwankungen von etwa 5 bis 7 Hz. Diese „6-Hz-Schwankungen“, die stets vorhanden waren, wenn das Kaninchen sich bewegte, unterscheiden sich deutlich von den erheblich größeren, unregelmäßigeren und durchschnittlich trägeren Potentialschwankungen, die man von der Rinde des unbeweglich aufgespannten Kaninchens erhält („Feldeigenströme“ nach A. E. Kornmüller). Die „Feldeigenströme“ konnte man auch von der Rinde des nicht aufgespannten Kaninchens ableiten, aber nur, wenn dieses sich vollkommen ruhig verhielt. Es wird die Frage erörtert, inwieweit die 6 Hz-Schwankungen den a- Wellen des Menschen, die „Feldeigenströme“, den vom schlafenden Menschen abgeleiteten Potentialschwankungen entsprechen.
Über einen Zusammenhang zwischen kritischer Temperatur und Ionisierungsspannung bei den Edelgasen
Authors: Bagge Erich , Harteck Paul 
Published: September 2020

Abstrakt
Zwischen der kritischen Temperatur und der Ionisierungsspannung besteht bei Edelgasen der durch Gl. (6j gegebene empirische Zusammenhang. Dies wird durch quantenmechanische Betrachtungen plausibel gemacht.
Über die Hydrolyse einiger organischer Halogenverbindungen in Dioxan-Wasser-Gemischen
Authors: Böhme Horst , Henning Hans-Jürgen 
Published: September 2020

Abstrakt
Die Hydrolyse von Benzylchlorid, Methyl-phenyl-chlor-methan und Diphenyl-chlormethan wird in Wasser-Dioxan-Gemischen verschiedener Zusammensetzung gemessen. Es wird eine starke Abhängigkeit der Reaktionsgeschwindigkeit vom Wassergehalt des Mediums festgestellt und darüber hinaus eine Beziehung zwischen den Geschwindigkeitskonstanten und den Dielektrizitätskonstanten der Dioxan-Wasser-Gemische wahrscheinlich gemacht, die sich mathematisch formulieren läßt
Ein Beitrag zur Wirkung des Alloxans auf die Langerhansschen Inseln
Authors: Stoll Walter 
Published: September 2020

Abstrakt
Es wird gezeigt, daß das Ninhydrin eine ähnliche Schädigung der Langerhansschen Inseln hervorrufen kann wie das Alloxan. Für diese Wirkung werden die drei benachbarten Ketogruppen als wesentlich angesehen