bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electro-optically spectrum switchable, multiwavelength optical parametric oscillators based on aperiodically poled lithium niobate
Authors: Wang Tai-Jie , Deng Lin-Ming , Chung Hung-Pin , Chang Wei-Kun , Pham Tien-Dat , Tseng Quan-Hsiang , Geiss Reinhard , Pertsch Thomas , Chen Yen-Hung 
Published: September 2020

We report the first fast switchable multiwavelength optical parametric oscillator based on aperiodic optical superlattice technology. The constructed aperiodically poled lithium niobate (APPLN) integrates the functionalities of two quasi-phase-matching devices on a chip to work simultaneously as an electro-optic (EO) switchable notch-like filter and a multiline optical parametric downconverter. When such an APPLN is built in a 1064-nm-pumped optical resonator system, we achieve the oscillation of dual signals at 1540 and 1550 nm, for a single signal at 1540 nm, and a single signal at 1550 nm in the system when the 3-cm-long APPLN is driven by 0 V, 354 V, and 805 V, respectively. The switching among the three signal spectra is operationally simple and electro-optically fast. The electro-optically switched signals also feature enhanced power spectral density due to the unique EO gain-spectrum filtering mechanism employed in this work.
Ultra-fast Stokes parameter correlations of true unpolarized thermal light: type-I unpolarized light
Authors: Kroh Florian , Rosskopf Markus , Elsässer Wolfgang 
Published: September 2020

We measure Stokes parameter correlations in analogy to the intensity correlation measurements in the original Hanbury-Brown & Twiss configuration by realizing an experimental setup by combining a Schaefer–Collett or Berry–Gabrielse–Livingston polarimeter with a Hanbury-Brown & Twiss intensity interferometer. We investigate true unpolarized light emitted from a broadband thermal light source, which we realize by an erbium-doped fiber amplifier, thus being an ideal source of true unpolarized light. We find that all Stokes parameter correlations⟨SnSn⟩,n∈{1,2,3}are equal to0.5⟨I⟩2. The proven invariance of the Stokes parameter correlations against retardation by wave-plates clearly shows for the first time, to the best of our knowledge, that our true unpolarized thermal light represents type I unpolarized light in accordance with a theoretical prediction for a classification of unpolarized light postulated more than 20 years ago.
Assessing local trends in indicators of ecosystem services with a time series of forest resource maps
Authors: Katila Matti , Rajala Tuomas , Kangas Annika 
Published: September 2020

Since the 1990âs, forest resource maps and small area estimates have been produced by combining national forest inventory (NFI) field plot data, optical satellite images and numerical map data using a non-parametric -nearest neighbour method. In Finland, thematic maps of forest variables have been produced by the means of multi-source NFI (MS-NFI) for eight to ten times depending on the geographical area, but the resulting time series have not been systematically utilized. The objective of this study was to explore the possibilities of the time series for monitoring the key ecosystem condition indicators for forests. To this end, a contextual Mann-Kendall (CMK) test was applied to detect trends in time-series of two decades of thematic maps. The usefulness of the observed trends may depend both on the scale of the phenomena themselves and the uncertainties involved in the maps. Thus, several spatial scales were tested: the MS-NFI maps at 16 Ã 16 m pixel size and units of 240 Ã 240 m, 1200 Ã 1200 m and 12â000 Ã 12â000 m aggregated from the MS-NFI map data. The CMK test detected areas of significant increasing trends of mean volume on both study sites and at various unit sizes except for the original thematic map pixel size. For other variables such as the mean volume of tree species groups, the proportion of broadleaved tree species and the stand age, significant trends were mostly found only for the largest unit size, 12â000 Ã 12â000 m. The multiple testing corrections decreased the amount of significant -values from the CMK test strongly. The study showed that significant trends can be detected enabling indicators of ecosystem services to be monitored from a time-series of satellite image-based thematic forest maps.k22222p
Primary Colonic Lymphoma With Paraneoplastic Hypercalcemia
Authors: Augustine Thomas , Perisetti Abhilash , Khan Salman Ali , Lobo Rodolfo Henrich , Tharian Benjamin 
Published: September 2020

ABSTRACT
Primary colonic lymphoma is a rare tumor accounting for 0.1%–0.5% of all colorectal malignancies. We describe a 63-year-old man whose initial presentation was altered mental status due to hypercalcemia. Physical examination revealed a hard, right-sided abdominal mass. Abdominal computed tomography showed a mass in the ascending colon, which on further evaluation with colonoscopy and biopsy was diagnosed as diffuse large B-cell lymphoma. A diagnosis of primary colonic lymphoma was made based on the Dawson criteria, after ruling out any extracolonic involvement. Workup for hypercalcemia showed elevated calcitriol levels, which is a paraneoplastic manifestation of the lymphoma.
Demonstration of ScroogeDB
Authors: Jo Saehan , Pei Jialing , Trummer Immanuel 
Published: September 2020

We demonstrate ScroogeDB which aims at minimizing monetary cost of processing aggregation queries in the Cloud. It runs on top of a Cloud database that offers pay-as-you-go query processing where users pay according to the number of bytes processed. ScroogeDB exploits deterministic approximate query processing (DAQ) to achieve monetary savings. That is, ScroogeDB provides deterministic bounds, i.e., bounds that contain the true value with a 100% probability. ScroogeDB creates small synopses of the database and uses these synopses to answer aggregation queries. By rewriting a query on base tables into a query on smaller synopses, we significantly reduce the amount of processed data. We do not pre-compute synopses in advance of an analysis session. Instead, we generate them on the fly, interleaving synopsis generation with query execution.
In our demonstration, we show that our system realizes impressive monetary savings with little precision loss. We run our system on top of the Google BigQuery Cloud platform and provide users with a graphical interface that visualizes deterministic bounds. The graphical interface also provides information regarding the generated synopses and how they contribute to monetary savings.
SQL for data scientists
Authors: Röhm Uwe , Brent Lexi , Dawborn Tim , Jeffries Bryn 
Published: September 2020

The SQL query language is the 'lingua franca' of transactional databases, and is essential for scalable data analytics. Learning SQL requires practical exercises with databases, including those parts of SQL with side-effects such as DDL statements, triggers, and stored procedures. Teaching this effectively to a non-technical audience is a challenge, especially in times of COVID-19 without face-to-face classes.
The Grok Learning platform allows to design self-paced online tutorials with auto-graded exercises - but it was originally built for teaching programming languages. In this demo, we show how we extended the Grok platform to teach SQL for Data Scientists with comprehensive online learning. Grok supports a rich user interface with interactive examples where students can explore and experiment with each example query. This is ideal for learning declarative querying. Each query is executed in its own sandbox on a freshly initialised database instance which allows to teach all parts of SQL including DDL statements, stored procedures, triggers and UDFs. At the same time, the platform scales to thousands of concurrent users, while maintaining interactive response times.
TiDB
Authors: Huang Dongxu , Liu Qi , Cui Qiu , Fang Zhuhe , Ma Xiaoyu , Xu Fei , Shen Li , Tang Liu , Zhou Yuxing , Huang Menglong , Wei Wan , Liu Cong , Zhang Jian , Li Jianjun , Wu Xuelian , Song Lingyu , Sun Ruoxi , Yu Shuaipeng , Zhao Lei , Cameron Nicholas , Pei Liquan , Tang Xin 
Published: September 2020

Hybrid Transactional and Analytical Processing (HTAP) databases require processing transactional and analytical queries in isolation to remove the interference between them. To achieve this, it is necessary to maintain different replicas of data specified for the two types of queries. However, it is challenging to provide a consistent view for distributed replicas within a storage system, where analytical requests can efficiently read consistent and fresh data from transactional workloads at scale and with high availability.
To meet this challenge, we propose extending replicated state machine-based consensus algorithms to provide consistent replicas for HTAP workloads. Based on this novel idea, we present a Raft-based HTAP database: TiDB. In the database, we design a multi-Raft storage system which consists of a row store and a column store. The row store is built based on the Raft algorithm. It is scalable to materialize updates from transactional requests with high availability. In particular, it asynchronously replicates Raft logs to learners which transform row format to column format for tuples, forming a real-time updatable column store. This column store allows analytical queries to efficiently read fresh and consistent data with strong isolation from transactions on the row store. Based on this storage system, we build an SQL engine to process large-scale distributed transactions and expensive analytical queries. The SQL engine optimally accesses row-format and column-format replicas of data. We also include a powerful analysis engine, TiSpark, to help TiDB connect to the Hadoop ecosystem. Comprehensive experiments show that TiDB achieves isolated high performance under CH-benCHmark, a benchmark focusing on HTAP workloads.
Spitz
Authors: Zhang Meihui , Xie Zhongle , Yue Cong , Zhong Ziyue 
Published: September 2020

Databases in the past have helped businesses maintain and extract insights from their data. Today, it is common for a business to involve multiple independent, distrustful parties. This trend towards decentralization introduces a new and important requirement to databases: the integrity of the data, the history, and the execution must be protected. In other words, there is a need for a new class of database systems whose integrity can be verified (or verifiable databases).
In this paper, we identify the requirements and the design challenges of verifiable databases. We observe that the main challenges come from the need to balance data immutability, tamper evidence, and performance. We first consider approaches that extend existing OLTP and OLAP systems with support for verification. We next examine a clean-slate approach, by describing a new system, Spitz, specifically designed for efficiently supporting immutable and tamper-evident transaction management. We conduct a preliminary performance study of both approaches against a baseline system, and provide insights on their performance.
Responsible data management
Authors: Stoyanovich Julia , Howe Bill , Jagadish H. V. 
Published: September 2020

The need for responsible data management intensifies with the growing impact of data on society. One central locus of the societal impact of data are Automated Decision Systems (ADS), socio-legal-technical systems that are used broadly in industry, non-profits, and government. ADS process data about people, help make decisions that are consequential to people's lives, are designed with the stated goals of improving efficiency and promoting equitable access to opportunity, involve a combination of human and automated decision making, and are subject to auditing for legal compliance and to public disclosure. They may or may not use AI, and may or may not operate with a high degree of autonomy, but they rely heavily on data.
In this article, we argue that the data management community is uniquely positioned to lead the responsible design, development, use, and oversight of ADS. We outline a technical research agenda that requires that we step outside our comfort zone of engineering for efficiency and accuracy, to also incorporate reasoning about values and beliefs. This seems high-risk, but one of the upsides is being able to explain to our children what we do and why it matters.
Quantum sensing with nanoparticles for gravimetry: when bigger is better
Authors: Rademacher Markus , Millen James , Li Ying Lia 
Published: September 2020

Abstract
Following the first demonstration of a levitated nanosphere cooled to the quantum ground state in 2020 (U. Delić, et al. Science, vol. 367, p. 892, 2020), macroscopic quantum sensors are seemingly on the horizon. The nanosphere’s large mass as compared to other quantum systems enhances the susceptibility of the nanoparticle to gravitational and inertial forces. In this viewpoint, we describe the features of experiments with optically levitated nanoparticles (J. Millen, T. S. Monteiro, R. Pettit, and A. N. Vamivakas, “Optomechanics with levitated particles,” Rep. Prog. Phys., vol. 83, 2020, Art no. 026401) and their proposed utility for acceleration sensing. Unique to the levitated nanoparticle platform is the ability to implement not only quantum noise limited transduction, predicted by quantum metrology to reach sensitivities on the order of 10−15 ms−2 (S. Qvarfort, A. Serafini, P. F. Barker, and S. Bose, “Gravimetry through non-linear optomechanics,” Nat. Commun., vol. 9, 2018, Art no. 3690) but also long-lived quantum spatial superpositions for enhanced gravimetry. This follows a global trend in developing sensors, such as cold-atom interferometers, that exploit superposition or entanglement. Thanks to significant commercial development of these existing quantum technologies, we discuss the feasibility of translating levitated nanoparticle research into applications.
Manus, quae supplevit, inscripsit scholia Theophili Protospatharii. Galien, Théophile et le commentaire mélange aux Aphorismes d’Hippocrate
Authors: Savino Christina 
Published: September 2020

Abstract
Galen’s commentary on the Hippocratic Aphorisms is transmitted by a large amount of Medieval and Renaissance manuscripts. Some of them remarkably display a “mixed” text, in which Galen’s commentary is combined with passages from the later commentator Theophilus. Most important among these is the Marc. gr. V 9 (coll. 1017), which inserts two large passages by Theophilus into the Galenic commentary (i. e. VI 1-38; VII 12-73). Both of them were copied by the late physician and student of John Argyropoulos in Constantinople, Demetrios Angelos, who was not primarly involved in the production, but purchased the manuscript after completion and restored its text using another commentary on the Aphorisms, which he had at his disposal. This paper aims at investigating codicological, paleographical and philological aspects of the Marc. gr. V 9, in order to retrace the origin of its mixed commentary and place it in its historical-cultural context.
Weighted Sub-Bergman Hilbert spaces in the unit ball of ℂ
n
Authors: Rososzczuk Renata , Symesak Frédéric 
Published: September 2020

Abstract
In this note, we study defect operators in the case of holomorphic functions of the unit ball of ℂn. These operators are built from weighted Bergman kernel with a holomorphic vector. We obtain a description of sub-Hilbert spaces and we give a sufficient condition so that theses spaces are the same.
Conducting Research Work as a Requirement for University Undergraduate Studies: Challenges of Distance Education Students in Ghana
Authors: Sumaila Jamilatu , Ankoma-Sey Vera Rosemary , Asamoah Daniel , Quansah Frank 
Published: September 2020

AbstractAs a partial condition for the successful completion of school, and for certification reasons, undergraduate distance education students in Ghanaian universities are required to conduct research work. Due to the mode of teaching and learning activities, it appears such students are at a disadvantage. In this study, we examined the challenges distance education students encounter in conducting their research work in two universities in Ghana. A cross-sectional survey was conducted using 866 distance education students sampled from the study centres across the country. Results from a confirmatory factor analysis, using 5,000 bootstrap samples, revealed challenges from the students, supervisors and the institutions. Based on our results, we recommend that there should be structured policies by university management and supervisors to relieve students of the challenges they encounter when conducting their research work. The study also encouraged students to devote the needed time, commitment and motivation to complete their research work on time. Suggestions for further studies were made based on the findings.
Effect of specimen configuration and orthotropy on the Young’s modulus of solid wood obtained from a longitudinal vibration test
Authors: Yoshihara Hiroshi , Maruta Makoto 
Published: September 2020

Abstract
Young’s modulus in the longitudinal direction was measured by a longitudinal vibration (LV) test on western hemlock specimens with various length/width ratios. The effects of the configuration and orthotropy of the specimen on the measurement of Young’s modulus was investigated through subsequent finite element (FE) calculations. The experimental results suggested that Young’s modulus could not be obtained accurately when the length/width ratio of the specimen was in a certain range. The FE calculations revealed that Young’s modulus in the transverse direction and Poisson’s ratio in the length-width plane, as well as the length/width ratio, affected the Young’s modulus value. However, the results showed that when the length/width ratio of the specimen was larger than 10, Young’s modulus could be measured accurately with the LV test with a reduction in the effect of orthotropy.
Effect of a rapid e-learning module and brief interprofessional simulation event on medical and nursing student collaborative attitudes and behaviors
Authors: Visker Joseph D. , Welker Kristen , Rhodes Darson , Forsyth Emily , Melvin Pamela , Cox Carol 
Published: September 2020

Abstract

Objectives
Undergraduate nursing and first-year medical students participated in a brief, scenario-based, interprofessional event. The experimental group only was provided an innovative, rapid e-learning instructional module focused on interprofessional roles/responsibilities and communication prior to the event.

Methods
Pre-post attitudes toward physician-nurse collaboration were surveyed, and collaborative behaviors were observed during the event.

Results
For the experimental group, a statistically significant (p<0.05) attitude improvement was found between pre-post e-learning module scores as well as pre-e-learning module and post-simulation event scores. For the control group, a statistically significant (p=0.001) attitude improvement was found between pre-post simulation event scores. No statistically significant differences in team collaborative behaviors were observed between experimental and control.

Conclusions
The combination of module and simulation event was not a more effective option than the event alone. As both interventions present unique challenges in regards to technology and facility requirements, having multiple effective intervention options will be of benefit to educational institutions.
“#JeSuisSirCornflakes”: Racialization and resemiotization in French nationalist Twitter
Authors: Tebaldi Catherine 
Published: September 2020

AbstractAfter the 2016 spelling reforms deleted the accent circumflex from some French vowels, on right-wing French Twitter, thecirconflexereappeared in the center of the French flag – echoing the flag of Vichy France. Tweets with the hashtag#JeSuisCirconflexeresemiotized the accent circumflex as icon of a lost Frenchness, or voiced the racial other in a colonial faux pidgin to frame them as illiterate and brutish. Drawing on research on resemiotization (Leppänen, Sirpa, Samu Kytölä, Henna Jousmäki, Saija Peuronen & Elina Westinen. 2014. Entextualization and resemiotization as resources for identification in social media. InThe language of social media, 112–136. London: Palgrave Macmillan) and raciolinguistics (Flores, Nelson & Jonathan Rosa. 2015. Undoing appropriateness: Raciolinguistic ideologies and language diversity in education.Harvard Educational Review, 85(2). 149–171), this article explores how constructions of mock youth French use raciolinguistic tropes to imagine a language of social decline, connecting linguistic purism to racist myths of white genocide and the great replacement. Despite this, youth invert the imagination of their illiteracy, using playful language and satirizing white speech (Rosa, Jonathan. 2016b. Standardization, racialization, languagelessness: Raciolinguistic ideologies across communicative contexts.Journal of Linguistic Anthropology26(2). 162–183) to contest French nationalism – reframing#JeSuisCirconflexeas#JeSuisSirCornflakes.
6-OHDA mediated neurotoxicity in SH-SY5Y cellular model of Parkinson disease suppressed by pretreatment with hesperidin through activating L-type calcium channels
Authors: Elyasi Leila , Jahanshahi Mehrdad , Jameie S. B. , Hamid Abadi Hatef Ghasemi , Nikmahzar Emsehgol , Khalili Masoumeh , Jameie Melika , Jameie Mana 
Published: September 2020

Abstract

Objectives
Parkinson’s disease (PD) is a neurological condition with selective progressive degeneration of dopaminergic neurons. Routine therapies are symptomatic and palliative. Although, hesperidin (Hsd) is known for its neuroprotective effects, its exact cellular mechanism is still a mystery. Considering the important role of calcium (Ca2+) in cellular mechanisms of neurodegenerative diseases, the present study aimed to investigate the possible effects of Hsd on Ca2+ channels in cellular model of PD and the possible association between the selective vulnerability of neurons in cellular models of PD and expression of the physiological phenotype that changes Ca2+ homeostasis.

Methods
SH-SY5Y cell line was used in this study; cell damage was induced by 150 µM 6-OHDA and the cells’ viability was examined using MTT assay. Intracellular calcium, reactive oxygen species (ROS) and mitochondrial membrane potential were determined by the fluorescence spectrophotometry method. The expressions of calcium channel receptors were determined by gel electrophoresis and immunoblotting.

Results
Loss of cell viability and mitochondrial membrane potential were confirmed in 6-OHDA treated cells. In addition, intracellular ROS and calcium levels, calcium channel receptors significantly increased in 6-OHDA-treated cells. Incubation of SH-SY5Y cells with hesperidin showed a protective effect, reduced the biochemical markers of cell damage/death, and balanced calcium hemostasis.

Conclusions
Based on our findings, it seems that hesperidin could suppress the progression of the cellular model of PD via acting on intracellular calcium homeostasis. Further studies are needed to confirm the potential benefits of preventive and therapeutic effects of stabilizing cellular calcium homeostasis in neurodegenerative disease.