bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optical asymmetric cryptosystem for multi-image in cyan–magenta–yellow–black color space
Authors: Shen Yuxin , Tang Chen , Zhou Lixiang , Lei Zhenkun 
Published: January 2020

In this paper, we propose an optical single-channel asymmetric cryptosystem for multi-image in cyan–magenta–yellow–black (CMYK) color space. To the best of our knowledge, this is the first time that multiple images in CMYK color space have been directly encrypted. The proposed optical asymmetric cryptosystem is based on the quick response (QR) encoding process and the designed Fresnel-linear canonical-fractional Fourier transform (FLFT) encryption process. Each FLFT encryption process consists of phase-truncated FLFT and random amplitude phase masks. The proposed cryptosystem without color space conversion can improve the quality of the decrypted images and avoid the loss of information. In addition, by utilizing the QR codes, the cross talk and quality-loss problems can be reduced efficiently. Numerical simulation results demonstrate that the proposed cryptosystem possesses high robustness against various types of attacks, high security for encrypting multiple color images, and fast encryption efficiency. Furthermore, the proposed cryptosystem outperforms the other relevant cryptosystems and can be extended to encrypt multiple color images in a straightforward way.
Generation of a mid-infrared femtosecond vortex beam from an optical parametric oscillator
Authors: Tong Hui , Xie Guoqiang , Qiao Zhen , Qin Zhipeng , Yuan Peng , Ma Jingui , Qian Liejia 
Published: January 2020

Mid-infrared femtosecond vortex beams generated by optical parametric oscillators (OPO) are reported for the first time, to the best of our knowledge. Order-tunable femtosecond Hermite–Gauss beams from the first to sixth order are produced from a synchronously pumped OPO and then converted into the corresponding first through sixth-order femtosecond vortex beams by a cylindrical lens mode converter. By slightly tuning the cavity length, the wavelength of the vortex beam can be continuously tunable in the range from 2323 to 2382 nm, and the pulse duration can be changeable from

∼

400

f
s

to

∼

1.1

p
s

. The work provides a flexible and reliable way to generate mid-infrared femtosecond vortex beams, and is of special significance for expanding the wavelength range of femtosecond vortex beams and their application fields.
Reliable coherent optical memory based on a laser-written waveguide
Authors: Liu Chao , Zhou Zong-Quan , Zhu Tian-Xiang , Zheng Liang , Jin Ming , Liu Xiao , Li Pei-Yun , Huang Jian-Yin , Ma Yu , Tu Tao , Yang Tian-Shu , Li Chuan-Feng , Guo Guang-Can 
Published: January 2020

151

E
u

3

+

-doped yttrium silicate (

151

E
u

3

+

:

Y

2

S
i
O

5

) crystal is a unique material that possesses hyperfine states with coherence time up to 6 h. Many efforts have been devoted to the development of this material as optical quantum memories based on bulk crystals, but integrable structures (such as optical waveguides) that can promote

151

E
u

3

+

:

Y

2

S
i
O

5

-based quantum memories to practical applications have not been demonstrated so far. Here we report the fabrication of type II waveguides in a

151

E
u

3

+

:

Y

2

S
i
O

5

crystal using femtosecond-laser micromachining. The resulting waveguides are compatible with single-mode fibers and have the smallest insertion loss of 4.95 dB. On-demand light storage is demonstrated in a waveguide by employing the spin-wave atomic frequency comb (AFC) scheme and the revival of silenced echo (ROSE) scheme. We implement a series of interference experiments based on these two schemes to characterize the storage fidelity. Interference visibility of the readout pulse is

0.99
±
0.03

for the spin-wave AFC scheme and

0.97
±
0.02

for the ROSE scheme, demonstrating the reliability of the integrated optical memory.
High-brightness and high-speed vertical-cavity surface-emitting laser arrays
Authors: Khan Zuhaib , Shih Jie-Chen , Chao Rui-Lin , Tsai Tzong-Liang , Wang Hsin-Chuan , Fan Gang-Wei , Lin Yu-Chen , Shi Jin-Wei 
Published: January 2020

High-power vertical-cavity surface-emitting laser (VCSEL) arrays, which can serve as the light source in modern lidar and three-dimensional optical sensing systems, have recently attracted a lot of attention. In these types of systems, the time-of-flight (ToF) technique, based on the round-trip time of short optical pulses is usually adopted. Further enhancement of the ranging distance and depth resolution in these ToF driven systems by the incorporation of a VCSEL array with a high available power, high brightness (narrow divergence angle), and fast response time is highly desirable. However, a large number of light emission apertures (several hundreds) in the VCSEL array is usually necessary to raise the output power level to several watts. This leads to a large parasitic capacitance and the RC-limited bandwidth may become the dominant limiting factor of the speed of the high-power VCSEL array. In this work, Zn-diffusion and oxide-relief apertures are used to manipulate the optical modes and reduce the parasitic capacitance, respectively, in a unit device for a 940 nm VCSEL array. The demonstrated VCSEL array has a quasi-single-mode output, high available power (4 W; 1% duty cycle), narrow divergence angle (

∼

14

∘

at

1

/

e

2

) under maximum output power, and a fast rise time (

<

100

p
s

). These results open up new possibilities for further enhancing the performance of ToF sensing systems at the 940 nm wavelength.
« Ne visitez pas l’exposition coloniale! » La campagne contre l’exposition coloniale internationale de 1931, un moment anti-impérialiste
Authors: Bollenot Vincent 
Published: January 2020

Abstract
In 1931, faced with the praise of the values of colonization at an exposition organized at Vincennes, anti-imperialist militants organized the response. If historiography has retained their counter-exposition, co-organized with communists at different levels (Communist Party, International, Anti-Imperialist League), the anti-imperialist campaign that surrounded it is less well known. Yet, bringing together various anti-imperialist actors during some critical moments, this campaign crystallized the state of anti-imperialism during the late 1920s and early 1930s, and reactivated connections between activists of various origins. This campaign provoked a renegotiation of the prioritization of struggles during the “class against class” strategy of the Komintern.
Great Men in Greater France: Léon Poirier’s L’Appel du silence and Brazza, ou l’épopée du Congo
Authors: White Owen 
Published: January 2020

Abstract
Cet article examine l’oeuvre du cinéaste Léon Poirier, un grand champion des vertus de l’empire colonial français pendant l’entre-deux-guerres. En dépit de son financement par des donateurs pour la plupart conservateurs, L’Appel du silence (1936), film biographique sur le père missionnaire Charles de Foucauld—assassiné en 1916 dans le désert sud-Algérien—plaisait néanmoins à un public très large. Beaucoup moins couronné de succès fut le film de Poirier sur Pierre Savorgnan de Brazza, l’un des fondateurs de l’empire français en Afrique équatoriale. Cette recherche propose que la carrière de Poirier nous montre comment l’empire est resté un point d’accord général même pendant l’agitation politique des années 1930. Pourtant l’insuccès de Brazza, qui est sorti en pleine drôle de guerre en 1940, est le symbole de la difficulté croissante de vendre une image d’héroïsme colonial dans la cadre des les perturbations produites par la Seconde guerre mondiale.
Crystal structure of bis(4-phenylpiperazin-1-ium) bis(2-(4-phenylpiperazin-1-yl)succinato-κ2O,O′)copper(II) tetrahydrate, C48H70CuN8O12, [C10H14N2]2[Cu(C14H17N2O4)2] ⋅ 4 H2O
Authors: Shin Jiehye , Kang Jaeun , Ok Kang Min , Do Junghwan 
Published: January 2020

Abstract
C48H70CuN8O12, triclinic, P1̄ (no. 2), a = 9.4869(1) Å, b = 11.2213(1) Å, c = 12.0819(1) Å, α = 74.608(1)°, β = 78.441(1)°, γ = 86.820(1)°, V = 1214.90(2) Å3, Z = 1, R
gt(F) = 0.0460, wR
ref(F
2) = 0.1239, T = 296(2) K.
Photochromic properties and crystal structure of 3,3′-(perfluorocyclopent-1-ene-1,2-diyl)bis(5-(4-(azidomethyl)phenyl)-2-methylthiophene), C29H20F6N6S2
Authors: Li Guoyin 
Published: January 2020

Abstract
C29H20F6N6S2, monclinic, C2/c (no. 15), a = 26.2504(11) Å, b = 8.6981(4) Å, c = 13.3064(6) Å, β = 107.659(2)°, V = 2895.1(2) Å3, Z = 4, R
gt(F) = 0.0436, wR
ref(F
2) = 0.1314, T = 296(2) K.
Crystal structure of 2-benzoylpyrene, C23H14O
Authors: Li Jing-Yang , Miao Bao-Xi , Zhao Yun , Zhang Li-Fang 
Published: January 2020

Abstract
C23H14O, monoclinic, P21/c (no. 14), a = 12.931(3) Å, b = 10.486(2) Å, c = 23.004(5) Å, β = 104.80(3)°, V = 3015.6(11) Å3, Z = 8, R
gt(F) = 0.0524, wR
ref(F
2) = 0.1375, T = 123(2) K.
The crystal structure of (E)-2-(((2-(1H-indol-3-yl)ethyl)iminio)methyl)-6-bromophenolate, C17H15N2BrO
Authors: Xi-Shi Tai , Xiao-Jing Zhou , Li-Li Liu , Shu-Hua Cao , Li-Hua Wang 
Published: January 2020

Abstract
C17H15N2BrO, monoclinic, P21/n (no. 14), a = 8.9886(8) Å, b = 8.2159(7) Å, c = 20.164(2) Å, β = 92.580(9)°, V = 1487.6(2) Å3, Z = 4, R
gt(F) = 0.0370, wR
ref(F
2) = 0.0716, T = 293(2) K.
HoloPort – Submikrometergenau 3D-Messen in der Werkzeugmaschine
Authors: Seyler Tobias , Engler Johannes , Fuchs Markus , Beckmann Tobias , Fratz Markus , Bertz Alexander , Carl Daniel , Grün Viktor , Börret Rainer , Ströer Felix , Seewig Jörg 
Published: January 2020

Zusammenfassung
Die Herstellung hochpräziser Bauteile erfordert Genauigkeiten, die selbst modernste Bearbeitungsmaschinen oft nicht zuverlässig liefern können. Abgenutzte Werkzeuge, falsch kalibrierte Sensoren oder unpassende Trajektorien können zu Bearbeitungsergebnissen führen, die den gewünschten Spezifikationen nicht entsprechen. Die Qualitätskontrolle erfolgt in der Regel stichprobenartig außerhalb der Werkzeugmaschine (WZM) in speziellen Messräumen. Überwachung und gegebenenfalls Regelung der Bearbeitungsqualität ist ein aufwändiger iterativer Prozess und bis dato nicht automatisiert. Wir präsentieren das digital-holographische Sensorsystem HoloPort, das die Oberflächentopographie bearbeiteter Bauteilen flächig mit Submikrometergenauigkeit direkt in der WZM misst: Nach unserem Kenntnisstand ist HoloPort das weltweit erste digital-holographische Messsystem zum Einsatz in einer WZM. Es besteht nicht nur aus einem Mehrwellenlängen-Interferometer, sondern beinhaltet auch einen miniaturisierten Grafikprozessor (GPU). Dies ermöglicht die vollständige Datenauswertung direkt im Sensor und damit in der WZM. Eine einzelne Messung mit 9 Mio. 3D-Punkten wird im drahtlosen Betrieb innerhalb von weniger als einer Sekunde durchgeführt und ist in einer Gesamtzeit von 3 s ausgewertet auf einen externen Computer übertragen. Die Verwendung von Standard-Schnittstellen erlauben die einfache Integration von HoloPort in eine Vielzahl von WZM. Dieser Beitrag enthält einen Überblick über die Sensorarchitektur und zeigt anhand von experimentellen Ergebnissen an Frästeilen die Leistungsfähigkeit des Systems. Inline-Anwendungen sowie weitere Perspektiven, die der Sensor eröffnet, werden vorgestellt.
Conserved Tao Kinase Activity Regulates Dendritic Arborization, Cytoskeletal Dynamics, and Sensory Function inDrosophila
Authors: Hu Chun , Kanellopoulos Alexandros K. , Richter Melanie , Petersen Meike , Konietzny Anja , Tenedini Federico M. , Hoyer Nina , Cheng Lin , Poon Carole L.C. , Harvey Kieran F. , Windhorst Sabine , Parrish Jay Z. , Mikhaylova Marina , Bagni Claudia , Calderon de Anda Froylan , Soba Peter 
Published: January 2020

Dendritic arborization is highly regulated and requires tight control of dendritic growth, branching, cytoskeletal dynamics, and ion channel expression to ensure proper function. Abnormal dendritic development can result in altered network connectivity, which has been linked to neurodevelopmental disorders, including autism spectrum disorders (ASDs). How neuronal growth control programs tune dendritic arborization to ensure function is still not fully understood. UsingDrosophiladendritic arborization (da) neurons as a model, we identified the conserved Ste20-like kinase Tao as a negative regulator of dendritic arborization. We show that Tao kinase activity regulates cytoskeletal dynamics and sensory channel localization required for proper sensory function in both male and female flies. We further provide evidence for functional conservation of Tao kinase, showing that its ASD-linked human ortholog, Tao kinase 2 (Taok2), could replaceDrosophilaTao and rescue dendritic branching, dynamic microtubule alterations, and behavioral defects. However, several ASD-linked Taok2 variants displayed impaired rescue activity, suggesting that Tao/Taok2 mutations can disrupt sensory neuron development and function. Consistently, we show that Tao kinase activity is required in developing and as well as adult stages for maintaining normal dendritic arborization and sensory function to regulate escape and social behavior. Our data suggest an important role for Tao kinase signaling in cytoskeletal organization to maintain proper dendritic arborization and sensory function, providing a strong link between developmental sensory aberrations and behavioral abnormalities relevant for Taok2-dependent ASDs.SIGNIFICANCE STATEMENTAutism spectrum disorders (ASDs) are linked to abnormal dendritic arbors. However, the mechanisms of how dendritic arbors develop to promote functional and proper behavior are unclear. We identifiedDrosophilaTao kinase, the ortholog of the ASD risk gene Taok2, as a regulator of dendritic arborization in sensory neurons. We show that Tao kinase regulates cytoskeletal dynamics, controls sensory ion channel localization, and is required to maintain somatosensory functionin vivo. Interestingly, ASD-linked human Taok2 mutations rendered it nonfunctional, whereas its WT form could restore neuronal morphology and function inDrosophilalacking endogenous Tao. Our findings provide evidence for a conserved role of Tao kinase in dendritic development and function of sensory neurons, suggesting that aberrant sensory function might be a common feature of ASDs.
Necessity of ESP (English for Specific Purpose) Courses for Medical and Science Students at Najran University, Saudi Arabia: An Exploratory-cum-remedial Study
Authors: Khan Mohammad Owais 
Published: January 2020

English as we know that plays a major role in higher education, Science and technology. It also plays a very essential role in the field of Medicine and other related disciplines because textbooks and journals are mostly written in English. This paper is an attempt to call for ESP courses specially designed to meet the needs of the growing demand of teaching English to Medicine and Science students or to modify the prerequisite course of such professional disciplines i.e. “Preparatory Year Program (PYP)” up to the level of ESP. The present study identifies the students’ acuities about the significance of the language skills, their ability in performing those skills, and their preferences regarding the English language course. It also sheds light on the problems in teaching English for specific purpose in Saudi Arabia. This study investigates the challenges encountered in teaching Medicine and Science students in Saudi Arabia and also attempts to answer the following questions: (a) what are the challenges that Medicine and Science teacher face while teaching? (b) What are the causes of these problems and (c) how can such problems be minimized? Finally, the findings of the research suggest some remedial measures and recommendations for improvement.
COMO ESTÃO “NAVEGANDO” NOS CURSOS DE PÓS-GRADUAÇÃO EM ADMINISTRAÇÃO?: um estudo sobre o uso da netnografia nas disciplinas de método de pesquisa
Authors: Corso Kathiane Benedetti , Estela Rodrigo de Oliveira , Bandeira Marina Valim 
Published: January 2020

O boom da internet nos últimos anos levou a sociedade a utilizar novas formas de comunicação. Seus usuários passaram de meros espectadores a produtores de conteúdo. Esta produção de conteúdo leva a uma evolução lógica dos métodos tradicionais de pesquisa, tanto no âmbito empresarial como nas instituições de ensino. Neste cenário, surge o método netnográfico ou, Netnografia. Esta nova ferramenta, focada na pesquisa online, e que favorece a coleta de informações on-line. Este estudo visa esclarecer o conceito básico a respeito da Netnografia, bem como demonstrar a utilização do método nos cursos de Pós-Graduação em Administração no Brasil.

PALAVRAS-CHAVE: Netnografia; Pós-Graduação; Metodologia da Pesquisa; Administração.

ABSTRACT
The growing of the internet in recent years has led society to use new forms of communication. His users went from mere viewers to content producers. This leads to a logical evolution of traditional research methods, both in business and in educational institutions. In this scenario, the netnographic method appears. This new tool, focused on online research favors the collection of online information such as images, vídeos and comments. In this way, the presente study aims to clarify the basic concept regarding Netnography, as well as demonstrate the use of the method in the PostGraduate courses in Business in Brazil.

KEYWORDS: Netnography; Post-Graduation; Research Methodology; Business.

RESUMEN
El boom de Internet en los últimos años ha llevado a la sociedad a utilizar nuevas formas de comunicación. Sus usuarios pasaron de meros espectadores a productores de contenido. Esta producción de contenido lleva a una evolución lógica de los métodos tradicionales de investigación, tanto en el ámbito empresarial como en las instituciones de enseñanza. En este escenario, surge el método netnográfico o, Netnografía. Esta nueva herramienta, enfocada en la búsqueda en línea, y que favorece la recolección de información en línea. Este estudio pretende esclarecer el concepto básico respecto a la Netnografía, así como demostrar la utilización del método en los cursos de Postgrado en Administración en Brasil.

PALABRAS CLAVE: Netnografía; Postgrado; Metodología de la Investigación; Administración
TECNOLOGIAS DIGITAIS NA EDUCAÇÃO TOCANTINENSE: uma análise da contribuição para o professor
Authors: Pinho Maria José de , Araújo Deusirene Magalhães de 
Published: January 2020

O artigo tem por objetivo analisar contribuições das tecnologias digitais para o professor tocantinense. Destaca as tecnologias na educação do Tocantins e a formação do professor como espaço de reflexão e autonomia docente. O artigo é parte da dissertação de Mestrado em Educação da Universidade Federal do Tocantins, intitulada contribuições do curso Redes de Aprendizagem do ProInfo, para construção de conceitos e autonomia de professores. Os resultados apontam que a inserção de tecnologias na educação do Tocantins, aliada a formação continuada Redes de Aprendizagem, contribuíra para a reflexão a sobre o contexto escolar atravessado pela cultura digital, inclusão digital e autonomia de professores, no uso de alguns recursos tecnológicos.

PALAVRAS-CHAVE: Tecnologias digitais; Tocantins; Formação de professor, autonomia.

ABSTRACT
The article aims to analyze the contributions of digital technologies to the teacher from Tocantins. It emphasizes the technologies in the education of the Tocantins and the formation of the teacher as space of reflection and autonomy teaching. The article is part of the dissertation of Master of Education of the Federal University of Tocantins, titled contributions of the ProInfo Learning Networks course, for the construction of concepts and autonomy of teachers. The results point out that the insertion of technologies in the education of Tocantins, together with the continued formation of Learning Networks, contributed to the reflection on the school context crossed by digital culture, digital inclusion and teacher autonomy, in the use of some technological resources.

KEYWORDS: Digital technologies; Tocantins; Teacher training, autonomy.

RESUMEN
El artículo tiene por objetivo analizar contribuciones de las tecnologías digitales para el profesor tocantinense. Destaca las tecnologías en la educación de Tocantins y la formación del profesor como espacio de reflexión y autonomía docente. El artículo es parte de la disertación de Maestría en Educación de la Universidad Federal de Tocantins, titulada contribuciones del curso Redes de Aprendizaje del ProInfo, para la construcción de conceptos y autonomía de profesores. Los resultados apuntan que la insersión de tecnologías en la educación de Tocantins, aliada a la formación continuada Redes de Aprendizaje, contribuyeron a la reflexión sobre el contexto escolar atravesado por la cultura digital, inclusión digital y autonomía de profesores, en el uso de algunos recursos tecnológicos.

PALABRAS CLAVE: Tecnologías digitales; Tocantins; Formación de professor: autonomía.
A Cost-Effective Evaluation of Pods Diversion Effectiveness using Fiber Optics DAS and DTS
Authors: Ugueto Gustavo , Huckabee Paul , Nguyen Audrey , Daredia Talib , Chavarria Jose , Wojtaszek Magdalena , Nasse Dave , Reynolds Alan 
Published: January 2020

Abstract
Diversion has been widely promoted as a technology that can both, lower the cost and increase the efficiency of plug-and-perforating completions (PnP). There are many diversion materials and techniques available today including; balls, chemicals, etc. A new product, informally referred as "pods" consisting of knotted degradable fibers delivered in a capsule, has gained significant interest within the industry.
We tested this new diversion material, "pods", in four stages in one of our wells instrumented with a fiber optic cable deployed behind casing. The FO results clearly showed that although perforations were plugged following "pods" deployment, the diagnostics also revealed that the outcome was not the desired one, which is to divert a portion of the treatment to understimulated clusters. In all the stages tested, the material did not re-open screened-out clusters. Furthermore, the frac placement distribution effectiveness was worse after the deployment of the diverter material.
All the tested stages showed the expected treatment pressure increase at the surface corresponding to the "pods" blocking some of the perforations. It is important to highlight that in the absence of downhole FO technology all these tests would have been categorized as successful. However, when the number of "pods" was increased to try to improve their performance, we ended up blocking so many perforations that the stimulation could not continue due to pressure limitations. This integrated approach toward the testing of this new technology demonstrated that there was a clear downside risk in utilizing this diversion technology in many wells without a full understanding of how this diverter material was interacting downhole with the clusters and perforations. The paper highlights the pitfalls and risks of relying on a single diagnostic tool (surface treatment pressure) to evaluate emerging technologies.
Fundamentally, there are two ways to empirically test new completion designs and stimulation technologies: Production-only-Pilots (PoP) and Integrated-Frac-Diagnostics-Pilots (IFDP). While better PnP efficiency is not the only intended use for "pods", the IFDP approach and FO monitoring used in this test has enabled a rapid and cost-effective testing of this technology application at a fraction of the cost and time of a PoP test.