bluuebunny/crossref_metadata_2025 huggingface dataset:
Auslegung von Servopressenantrieben/Design of Servo Press Powertrains
Authors: Behrens Bernd-Arno , Krimm Richard , Höber André
Published: January 2021

Die Auslegung des Antriebsstrangs einer Servopresse stellt einen komplexen Prozess dar. Aufgrund der konstruktiven Wechselwirkung der Komponenten ist dieser mit einer potenziell großen Anzahl von Iterationsstufen, häufig auch im Kontakt mit Zulieferern, verbunden. Im Beitrag wird ein Softwaretool vorgestellt, das den Entwicklungsprozess einer Servo- presse beschleunigt und variabler gestaltet. Im Rahmen des Vorhabens wurde neben einem parametrischen Motormodell ein variables mechanisches Modell eines Servopressen-Antriebsstrangs erstellt und validiert.

 

The design of a servo press drive is a complex process. Due to the interaction of the design components in the drive train, it is subject to a potentially large number of iteration stages, often also in contact with suppliers. This article presents a software tool that accelerates the development process of an electrical servo press drive. Within the presented research project, a parametric motor model and a mechanic model of a servo press powertrain were developed and validated.
Dornhonen mit induzierten Schwingungen/Single-pass honing with forced oscillations – Defining oscillation parameters and analyzing their effects on single-pass honing
Authors: Uhlmann Eckart , Zimmermann Sascha , Thalau Janis
Published: January 2021

Die Dornhonbearbeitung wird eingesetzt, wenn hohe Form- und Maßgenauigkeiten bei der Bearbeitung von Zylinderinnenflächen gefordert sind. Durch den Einsatz induzierter Schwingungen können die Prozesskenngrößen und Arbeitsergebnisse gezielt beeinflusst werden. In diesem Beitrag werden kinematische Grundlagen verschiedener Schwingungsparameter analysiert und deren Auswirkungen bei der Dornhonbearbeitung ermittelt.

 

Single-pass honing is used whenever high shape and dimensional accuracy is required for machining the inner surfaces of cylinders. By inducing oscillations, the process characteristics and work results can be specifically influenced. This paper analyzes the kinematic basics of different oscillation parameters and their effects on single pass honing.
Detektion des Vorspannungsverlusts in Kugelgewindetrieben/Detection of preload loss in ball screw drives – Optimization of machine tool maintenance with the Guard Plus system
Authors: Veith Moritz , Zimmermann Andreas , Hillenbrand Jonas , Fleischer Jürgen
Published: January 2021

Ziel der Instandhaltung von Werkzeugmaschinen ist die Verfügbarkeitsabsicherung, um hohe Bauteilqualität und Produktivität zu gewährleisten. Die Kenntnis des Vorschubachsenzustandes, im Besonderen des Kugelgewindetriebs, ist daher von enormer Wichtigkeit. Das „Guard-Plus“-System, eine Entwicklung der August Steinmeyer GmbH und der ifm diagnostics GmbH, ermöglicht dies durch Detektion des Vorspannungsverlustes aufgrund von Verschleiß. Untersuchungen zur Systemfunktion wurden in diesem Beitrag durch das wbk Institut für Produktionstechnik durchgeführt.

 

The aim of machine tool maintenance is to ensure availability in order to guarantee high product quality and productivity. Knowledge of the wear condition of feed axes involved, especially the ball screw, is therefore of enormous importance. The Guard Plus system, a joint development of August Steinmeyer GmbH and ifm diagnostics GmbH, enables this by detecting the preload loss due to wear. Investigation of the system’s function are presented through wbk Institute of Production Science in the following article.
Autonomes Oberflächenschleifen von Aluminium-Anbauteilen/Autonomous grinding of lightweight constructions
Authors: Brassel Jan-Oliver , Hönle Severin , Fleischer Jürgen , Pulli Hannah
Published: January 2021

Zum Erfüllen der hohen Anforderungen an fehlerfreie Blechteiloberflächen werden häufig manuelle Aufwendungen in die Fertigstellung der Bauteile investiert. Mit Blick auf Produktivität und Wiederholgenauigkeit sollen Teilumfänge der Fertigstellung automatisiert werden. Inhalt dieses Beitrags ist die Konzeption einer Prozesskette zum autonomen Schleifen von Karosseriebauoberflächen sowie die Betrachtung eines Algorithmus zur Berechnung der Bearbeitungsreihenfolge.

 

Flawless paintwork on car body structures does require defect-free sheet metal surfaces. Therefore, mainly inline and manual refinement efforts are made to surface finishing the single car bodies before painting. Targeting productivity and repeat accuracy can make it necessary to automate certain amounts of this labour-intensive process. This paper presents a technological solution for autonomously grinding sheet metal structures as well as detailing an algorithm for calculating the sequence of steps for autonomous grinding.
Datengetriebene Steigerung der Verfügbarkeit/Data-supported root cause analysis to increase the availability of machine tools. Data-driven availability increase
Authors: Uhlmann Eckhart , Dumitrescu Roman , Polte Julian , Meyer Maurice , Simsek Deniz
Published: January 2021

Die Zuverlässigkeit von Werkzeugmaschinen ist ein kritischer Faktor für den Erfolg produzierender Unternehmen. Durch die Analyse von Daten in der Produktplanung können Maschinenhersteller Ausfallursachen eliminieren und Maschinen systematisch verbessern. Jedoch stellt eine umfassende Datenanalyse viele Unternehmen vor große Herausforderungen. Die in diesem Beitrag vorgestellte Methodik adressiert diese Problematik und unterstützt Unternehmen bei der zielgerichteten Datenanalyse.

 

The reliability of machine tools is a critical factor for the success of manufacturing companies. By analyzing data in product planning, machine manufacturers can eliminate causes of failure and systematically improve machines. However, comprehensive data analysis poses great challenges for many companies. The methodology presented in this paper addresses this problem and supports companies in the goal-driven data analysis.
3Dsupply – Ersatzteilversorgung aus dem 3D-Drucker/3Dsupply – additive manufactured spare parts Qualifying a logistic provider to supply additive manufactured spare parts
Authors: Schott Lars , Keun Christian-André , Kaysser T. Simon
Published: January 2021

Um den disruptiven Risiken der additiven Fertigungstechnologie für die Logistikbranche zu begegnen, wird ein Logistikdienstleister dazu befähigt, die Technologie in seinem Dienstleistungsportfolio einzugliedern. Die Besetzung der Schnittstelle zwischen Kunden und Produzenten ermöglicht es wertschöpfende Elemente in die Prozesskette des Logistikdienstleisters zu integrieren, indem dieser sich als Experte zur technischen und wirtschaftlichen Bewertung von additiven Bauteilen etabliert.

 

In order to counter the disruptive risks of additive manufacturing technology for the logistics industry, a logistics service provider is enabled to integrate the technology into its service portfolio. Filling the interface between customers and producers enables value-adding elements to be integrated into the process chain of the logistics service provider by establishing itself as an expert for the technical and economic evaluation of additive components.
Intelligente Fertigungszelle für die Implantatherstellung/Productive implant production with intelligent manufacturing cell – How the integration of measurement technology in implant manufacturing increases productivity while fulfilling the Medical Device Regulations (MDR)
Authors: Denkena Berend , Dittrich Marc-André , Winkler Martin , Kaiser Sebastian
Published: January 2021

Im Rahmen des vom BMBF (Bundesministerium für Bildung und Forschung) geförderten Projekts „TempoPlant“ wird eine teilautonome Fertigungszelle für die Herstellung orthopädischer Implantate erforscht. Dabei wird ein Bearbeitungszentrum mit Messtechnik zur Qualitätskontrolle und Prozessüberwachung ausgestattet. Die gewonnenen Daten werden für die Prozessüberwachung, die Qualitätsregelung und die Dokumentation entsprechend den Richtlinien der Medical Device Regulation (MDR) genutzt.

 

As part of the research project TempoPlant, funded by the BMBF (Bundesministerium für Bildung und Forschung), a semi-autonomous manufacturing cell for production of orthopedic implants is being investigated. For this purpose, a machining center is equipped with in-line measurement systems for process forces and the component’s geometry. The acquired data will be used for process monitoring, quality control and documentation according to the guidelines of Medical Device Regulation (MDR).
Fließpressen hohler Wellen mit Wanddickenvariation/Cold forging of hollow shafts with wall thickness variation – Numerical investigation of a hollow forward extrusion process with adjustable deformation zone
Authors: Weiß Alexander , Liewald Mathias
Published: January 2021

Die Fertigung von Hohlwellen mit komplexer Innengeometrie bedingte bisher meist aufwendige Prozessrouten. Ein am Institut für Umformtechnik der Universität Stuttgart entwickeltes Kaltfließpressverfahren soll nun die wirtschaftliche und flexible Fertigung von Hohlwellen mit Wanddickenvariation ermöglichen. In diesem Beitrag werden das Verfahren beschrieben und die Ergebnisse der numerischen Untersuchung des Einflusses der Werkzeugkinematik auf die erzielbare Pressteilgeometrie dargelegt.

 

Usually, the production of hollow shafts with complex internal geometry by cold forging requires extensive process routes. A novel cold forging process developed at the Institute for Metal Forming Technology at the University of Stuttgart allows for an economical and flexible production of hollow shafts. This article describes the manufacturing process and presents the results of a numerical investigation for determining the influence of tool kinematics on the achievable part geometry.
Lochen mit Blechlagewinkel – Methodenoptimierung/Punching with a slant angle – a novel approach in process design
Authors: Schenek Adrian , Liewald Mathias
Published: January 2021

Die beim Lochen von Bauteilen aus Blech mit Blechlagewinkel erzielbaren Schnittflächenkenngrößen können nach aktuellem Stand der Technik nicht ausreichend präzise prognostiziert werden. Daher werden in der Praxis maximal realisierbare Blechlagewinkel meist zu konservativ abgeschätzt. Mit den in diesem Beitrag vorgestellten Schnittflächen-Regressionsmodellen kann der benötigte Einsatz von kosten- und wartungsintensiven Keilschiebern genauer bewertet und somit eine flexiblere, kostenoptimierte Gestaltung von Schneidwerkzeugen ermöglicht werden.

 

Today, cutting surfaces achievable by punching sheet metal components with a slant angle cannot be predicted sufficiently precise. In industrial practicet, maximum slant angles applicable for shear cutting are therefore usually estimated rather conservatively. According to the regression model-based determination of cutting surfaces presented in this paper, demand for cost and maintenance-intensive cams can be evaluated more accurately, thus enabling a more flexible, cost-optimized design of cutting tools.
Akustische Emissionsmessung an Papier/Acoustic emission analysis on paper – Identification of failure mechanisms in the forming of sustainable fibre materials
Authors: Mushövel Julian , Völker Torben , Groche Peter
Published: January 2021

Die Faserbewegungen und mikromechanischen Mechanismen während der Umformung von Papier sind bis heute nicht gänzlich geklärt. In dieser Arbeit werden die Einsatzmöglichkeiten der akustischen Emissionsmessung (AE-Messung) zur Analyse des Faserverhaltens untersucht. Zu diesem Zweck werden Zugversuche mit Papierproben an einem Miniaturzugprüfstand durchgeführt. Zusammenhänge zwischen mikromechanischen Prozessen im Papier und den Peak-Frequenzen der detektierten AE-Signale werden aufgedeckt.

 

The fibre movements and micromechanical mechanisms during the forming of paper are still not fully understood. This paper investigates the application of acoustic emission analysis (AE analysis) for the characterization of fibre behaviour. For this purpose, tensile tests with paper samples are performed on a miniature tensile test rig. Correlations between micromechanical processes in the paper and the peak-frequencies of the detected AE signals are found.
Blockchain in der Blechverarbeitung/Blockchain in sheet metal processing
Authors: Lechner Michael , Christ Tassilo , Frey Philipp , Wituschek Simon , Arzhanov Alexander , Petrov Fedor , Merklein Marion
Published: January 2021

Die Verfolgung von Bauteilen und Zwischenprodukten sowie die Erfassung eines vollständigen Produktionsdatensatzes sind in modernen Fertigungsketten eine wichtige Voraussetzung für die durchgängig digitale Produktion. Dieser Beitrag stellt die Lösung dieser Herausforderungen durch die Kombination zweier Systeme vor: Während eine blockchain-basierte Austauschplattform die Einhaltung der Anforderungen an die prozessübergreifende Vernetzung sicherstellt, kommt eine optische Technologie für die markierungsfreie Bauteilidentifizierung zum Einsatz.

 

The ability to both track physical products and to gather a production data record are important elements of modern manufacturing processes and crucial requirements for an end-to-end digital production. This work presents a solution for both challenges based on the combination of two systems: While a blockchain-based data exchange platform ensures that the requirements towards networked processes are met, an optical technology for marker-free identification of component parts is used.
Phasic pupillary responses modulate object-based attentional prioritization
Authors: O’Bryan Sean R. , Scolari Miranda
Published: January 2021

Visual attention studies have demonstrated that the shape of space-based selection can be governed by salient object contours: when a portion of an enclosed space is cued, the selected region extends to the full enclosure. Although this form of object-based attention (OBA) is well established, one continuing investigation focuses on whether this selection is obligatory or under voluntary control. We attempt to dissociate between these alternatives by interrogating the locus coeruleus-norepinephrine (LC-NE) system – known to fluctuate with top-down attention – during a classic two-rectangle paradigm in a sample of healthy human participants (N = 36). An endogenous spatial pre-cue directed voluntary space-based attention (SBA) to one end of a rectangular frame. We manipulated the reliability of the cue, such that targets appearing at an uncued location within the frame occurred at low or moderate frequencies. Phasic pupillary responses time-locked to the cue display served to noninvasively measure LC-NE activity, reflecting top-down processing of the spatial cue. If OBA is controlled analogously to SBA, then object selection should emerge only when it is behaviorally expedient and when LC-NE activity reflects a high degree of top-down attention to the cue display. Our results bore this out. Thus, we conclude that OBA was voluntarily controlled, and furthermore show that phasic norepinephrine may modulate attentional strategy.
Annulation of a 1,3-dithiole ring to a sterically hindered o-quinone core. Novel ditopic redox-active ligands
Authors: Norkov Sergey V , Cherkasov Anton V , Shavyrin Andrey S , Arsenyev Maxim V , Kuropatov Viacheslav A , Cherkasov Vladimir K
Published: January 2021

The fused 1,3-dithiole spacer seems to be very suitable for the functionalization of sterically hindered o-quinones with additional groups capable of coordination of metal ions and/or possessing a redox activity. An effective method for the synthesis of sterically hindered o-quinones containing 1,3-diketonate, dinitrile and p-quinone-methide functional groups at the periphery of the ligand has been developed. The novel compounds have rigid and conjugated structures and exhibit properties typical of o-quinones. A study of their monoreduced semiquinone derivatives reveal that the spin density is delocalized across the whole molecule, including peripheral fragments. The first stable o-quinone derivative bearing an annulated thiete heterocycle has been isolated and characterized.
ÜNİVERSİTE ÖĞRENCİLERİNİN PROFESYONEL PSİKOLOJİK YARDIM ALMA DAVRANIŞININ BİREYSEL VE ÇEVRESEL DEĞİŞKENLER BAKIMINDAN KARŞILAŞTIRILMASI
Authors: ÜLKEN Emine , ODACI Hatice
Published: January 2021

Üniversite öğrencilerinin profesyonel psikolojik
yardım alma davranışlarını etkileyen pek çok bireysel ve çevresel değişken
bulunmaktadır. Bu araştırmada farklı fakültelerde öğrenim gören üniversite
öğrencilerinin profesyonel psikolojik yardım arama davranışlarının cinsiyet,
fakülte, sınıf düzeyi, kalınan yer ve algılanan gelir düzeyi değişkenlerine
dayalı olarak değerlendirilmesi amaçlanmıştır.Araştırma grubunu farklı
fakültelerde öğrenim görmekte olan 441'i kadın, 320'si erkek ve 25'i cinsiyete
dayalı bir bildirimde bulunmayan toplam gönüllü 786 üniversite öğrencisi
oluşturmuştur. Araştırma grubunda yer alan öğrencilerin yaşları 17 ile 42
arasında değişmekte olup yaş ortalamaları 20.55'tir (Ss: 2.01). Çalışmanın
verileri araştırmacılar tarafından hazırlanan Demografik Bilgi Formu ve
Psikolojik Yardım Almaya İlişkin Tutum Ölçeği-K ile toplanmıştır. Araştırma
sonunda, üniversite öğrencilerinin profesyonel psikolojik yardım alma
davranışlarının cinsiyet, fakülte ve kalınan yer değişkenlerine göre anlamlı
farlılıklar gösterdiği, ancak algılanan ekonomik düzeye dayalı olarak anlamlı
farklılıkların olmadığı belirlenmiştir. Elde edilen bulgular, alanyazın
bilgileri ışığında tartışılmıştır. Bu araştırmanın sonuçlarının üniversite
öğrencilerinin profesyonel psikolojik yardım alma davranışlarını etkileyen bazı
bireysel ve çevresel değişkenleri belirlenmesi açısından önemli olduğu ve bu
kapsamda özellikle üniversitelerdeki psikolojik danışma merkezlerine
yapacakları çalışmalar için yol gösterici bazı bilgiler sunduğu
düşünülmektedir.
WORKSHOP PARENTING TINGKAT KECAMATAN MAUPONGGO
Authors: Ita Efrida , Ngura Elisabeth Tantiana
Published: January 2021

Tujuan dari kegiatan pengabdian kepada masyarakat ini adalah 1) membekali kompetensi orang tua dalam memahami stimulasi sejak bayi dalam kandungan, 2) membekali kompetensi orang tua dalam memahami cara pola asuh yang tepat untuk diberikan kepada anak. Hal tersebut penting diperhatikan berkaitan dengan penanganan Pendidikan Anak Usia Dini di lembaga (center base) tidak dapat dilepaskan dari penanganan PAUD di rumah (home base), keduanya saling terkait dan sejalan. Pembelajaran anak di lembaga yang hanya dapat mengisi anak sebesar 20% dimanfaatkan sebaik-baiknya oleh guru. Namun tidak menjadi berarti apabila saat anak berada dalam lingkungan keluarga tidak mendapat pendidikan yang tepat seperti yang dilaksanakan pada lembaga. Metode yang digunakan dalam pelaksanaan kegiatan pengabdian ini adalah berbentuk pelatihan dalam pemberian stimulasi dan pola asuh bagi orang tua terhadap anak. Karena hal ini penting bagi keluarga dalam hal ini orang tua untuk menyesuaikan pembelajaran bagi anak di lembaga PAUD dan di rumah sehingga apa yang anak belajar di lembaga dalam hal ini sekolah akan sama dengan yang anak dapatkan atau belajar di rumah. Hasil yang diperoleh dari pelaksanaan pengadian kepada masyarakat ini adalah para orang tua dibekali dengan kompetensi dalam memahami stimulasi sejak bayi dalam kandungan dan dilatih simulasi stimulasi edukatif bagi anak sehingga memahami cara pola asuh yang tepat untuk diberikan kepada anak guna mengoptimalkan tumbuh kembang anak sejak dari dalam kandungan.
PENYULUHAN PENDIDIKAN KARAKTER KEPADA GURU SMP KOTA BEKASI
Authors: Wulansari Lusiana , Cleopatra Maria , Sahrazad Sara , Widiyarto Sigit
Published: January 2021

Kegiatan pengabdian kepada masyarakat dilatarbelakangi pentingnya pendidikan karakter para siswa, agar mereka dapat mencapai tujuan hidupnya kelak. Penyuluhan ini dirasakan penting, sebab masih banyak karakter menyimpang yang dilakukan oleh anak dibawah umur. Baik itu nilai – nilai kesusilaan dan moral. Tujuan penyuluhan ini, untuk meningkatkan dan memperkuat pola pendidikan karakter pada guru SMP dengan cara pembiasaan dan menjadi tauladan bagi para siswa. Data dikumpulkan dalam catatan harian/jurnal harian. Sedangkan contoh tauladan dapat dicatat dalam RPP dan buku laporan harian guru. Pelaksanaan kegiatan ini menggunakan metode penyuluhan tatap muka berbasis protokol kesehatan, pemberian materi, praktik dan pendampingan, serta evaluasi dan wawancara tiap semester Kegiatan ini diikuti oleh 16 guru bidang studi dan staf tata usaha sebanyak 4 orang pada SMP Yadika 4 Kota Bekasi. Kegiatan dilakukan dengan new normal dimana diterapkan protokol kesehatan yang ketat, agar pelaksanaan berjalan dengan baik dan aman. Kegiatan pengabdian kepada masyarakat ini berlangsung dari bulan Agustus sampai dengan September 2020. Hasil kegiatan menunjukkan pada hasil soal studi kasus yang telah diberikan oleh tim kepada para guru, nampak rata-rata hasil dari evaluasi sebesar 78 (kategori baik), dari hasil wawancara menunjukkan para guru kurang konsisten dalam menanamkan karakter, namun setelah diadakan kegiatan ini, mereka lebih percaya diri dan termotivasi. Para orang tua juga harus membantu pembentukan karakter para siswa, agar siswa merasa diperhatikan dan selalu membiasakan karakter dirumah maupun disekolah.
PENDAMPINGAN GURU SD DALAM PENYELENGGARAAN OLIMPIADE MIPA TINGKAT SD
Authors: Lawe Yosefina Uge , Laksana Dek Ngurah Laba , Awe Ermelinda Yosefa , Wau Maria Patrisia , Noge Maria Desideria , Wewe Melkior , Rawa Natalia Rosalina , Kua Maria Yuliana
Published: January 2021

Tujuan dari pengabdian ini adalah Meningkatkan kemampuan akademik siswa/I Sekolah Dasar, Mengembangkan kompetensi dan keterampilan siswa, Meningkatkan kualitas pendidikan di Sekolah Dasar, menjalin kerjasama dengan sekolah-sekolah terkait. Pentingnya kegiatan pendampingan olimpiade Matematika dan IPA tingkat SD se-kecamatan Golewa Barat karena diharapkan seluruh siswa mampu menyelesaikan soal-soal lomba dengan hasil yang memuaskan, siswa mendapatkan pengalaman dan pengetahuan baru dalam kegiatan lomba sebagai bekal untuk menghadapi Ujian Akhir Nasional. Bentuk kegiatan ini adalah pendampingan kegiatan olimpiade Matematika dan IPA tingkat SD se-Kecamatan Golewa Barat. Peserta dalam kegiatan ini adalah siswa/siswi SD Kelas 5 dari 12 Sekolah yang berjumlah 52 siswa yang terdiri dari 26 untuk mata pelajaran Matematika dan 26 untuk mata pelajaran IPA. Metode kegiatan ini adalah dalam bentuk babak penyisihan dan babak Final. Hasil dari kegiatan ini adalah mendapatkan 3 besar dari masing-masing mata pelajaran untuk diutus ke olimpiade tingkat Kabupaten.
PENGEMBANGAN BUKU AJAR MENGACU KURIKULUM 2013 UNTUK SISWA SEKOLAH DASAR
Authors: Awang Imanuel Sairo , Novianti Elisabet Vivi , Wahyuni Florentina Rahayu Esti
Published: January 2021

Penerapan Kurikulum 2013 menuntut kompetensi sikap, pengetahuan dan ketrampilan yang harus dimiliki oleh siswa. Setiap kegiatan pembelajaran menuntut siswa memahami berbagai konsep menggunakan pendekatan ilmiah. Penelitian ini bertujuan mendeskripsikan pengembangan buku ajar mengacu Kurikulum 2013 subtema sumber energi untuk siswa kelas IV Sekolah Dasar. Metode penelitian yang digunakan adalah reserach and development dengan model pengembangan Kemp yang terdiri dari delapan langkah, yakni potensi dan masalah, pengumpulan data, desain produk, validasi desain, revisi desain, uji coba produk, revisi, produk final. Hasil penelitian menunjukan bahwa buku ajar yang dikembangkan dinyatakan layak berdasarkan hasil validasi tampilan buku ajar dan hasil validasi materi dengan rata-rata perolehan skor masing-masing sebesar 88,05% dan 90,9%, maka buku ajar layak diterapkan pada siswa kelas IV Sekolah Dasar. Hasil observasi aktivitas siswa uji coba skala terbatas di Sekolah Dasar Negeri 07 Belikai masing-masing sebesar 97,5%. Pada uji coba skala luas di Sekolah Dasar Negeri 15 Bekuan hasil observasi aktivitas siswa sebesar 100%, sedangkan di Sekolah Dasar Negeri 06 Seneban hasil observasi aktivitas siswa sebesar 100%. Dengan demikian dapat disimpulkan bahwa pengembangan buku ajar mengacu Kurikulum 2013 subtema sumber energi layak diterapkan pada siswa kelas IV Sekolah Dasar.
DNA barcoding of native Caucasus herbal plants: potentials and limitations in complex groups and implications for phylogeographic patterns
Authors: Aghayeva Parvin , Cozzolino Salvatore , Cafasso Donata , Ali-zade Valida , Fineschi Silvia , Aghayeva Dilzara
Published: January 2021

DNA barcoding has rapidly become a useful complementary tool in floristic investigations particularly for identifying specimens that lack diagnostic characters. Here, we assess the capability of three DNA barcode markers (chloroplast rpoB, accD and nuclear ITS) for correct species assignment in a floristic survey on the Caucasus. We focused on two herbal groups with potential for ornamental applications, namely orchids and asterids. On these two plant groups, we tested whether our selection of barcode markers allows identification of the “barcoding gap” in sequence identity and to distinguish between monophyletic species when employing distance-based methods. All markers successfully amplified most specimens, but we found that the rate of species-level resolution amongst selected markers largely varied in the two plant groups. Overall, for both lineages, plastid markers had a species-level assignment success rate lower than the nuclear ITS marker. The latter confirmed, in orchids, both the existence of a barcoding gap and that all accessions of the same species clustered together in monophyletic groups. Further, it also allowed the detection of a phylogeographic signal.The ITS marker resulted in its being the best performing barcode for asterids; however, none of the three tested markers showed high discriminatory ability. Even if ITS were revealed as the most promising plant barcode marker, we argue that the ability of this barcode for species assignment is strongly dependent on the evolutionary history of the investigated plant lineage.
Qu’est-ce qu’une société selon l’ Iliade ? Éléments de réflexion
Authors: Judet de La Combe Pierre
Published: January 2021

La question habituelle : quelle société historique « Homère » représente-t-il dans l’ Iliade et l’ Odyssée  ?, gagnerait à être accompagnée de la question : quel rapport avec la réalité sociale, politique, religieuse la poésie homérique tente-t-elle d’instaurer ? Cette poésie, que l’on a autrefois qualifiée d’objective, donne une place immense aux phénomènes sociaux, mais selon quel point de vue les refigure-t-elle ? Dans un premier temps, il s’agit de définir ce point de vue en revenant sur la manière dont la poésie homérique analyse la fonction sociale du discours poétique, son rapport au temps historique (avec la fin de l’Âge des héros), la signification de la nature rituelle de sa performance . Puis, partant du constat que l’un et l’autre poème ont choisi comme thème des séparations radicales, d’Achille et d’Ulysse, et en font le schème narratif qui leur permet de représenter la multiplicité des rapports sociaux (entre humains et entre divinités), l’étude s’intéresse à la manière dont, à partir de cette situation de crise, ils interrogent les différentes dimensions du politique comme principe unificateur des sociétés. L’accent est mis sur les différences systémiques entre les normes fondamentales qui, dans l’ Iliade , organisent les sociétés achéenne et troyenne.
Gestion de crise et légalité constitutionnelle : le pouvoir face au Hirak
Authors: Aït-Aoudia Myriam
Published: January 2021

Afin d’éviter le double écueil, normatif et rétrospectif, répandu dans la littérature académique, cet article se propose de saisir la dynamique politico-institutionnelle enclenchée en Algérie depuis février 2019 comme un processus ouvert et incertain. Il souligne en particulier l’évolution improvisée et erratique des différentes « solutions » de sortie de crise mises en œuvre par le pouvoir.
Hirak : la difficile relève politique
Authors: Zerrouky Hassane
Published: January 2021

En treize mois, le Hirak a modifié le visage de l’Algérie. Ce mouvement de contestation a fait émerger au sein d’une société que l’on pensait socialement résignée, et en dehors de tout cadre partisan, une myriade d’acteurs structurés de manière horizontale et porteurs d’une volonté de changement que l’opposition politique a été incapable d’assumer. Reste à savoir si ces forces, que le pouvoir tente d’étouffer pour imposer son agenda, préfigurent la relève politique de demain.
Les islamistes ont-ils gagné en Algérie ?
Authors: Larroque Anne-Clémentine
Published: January 2021

Le Hirak a dès le départ suscité des interrogations sur le retour des islamistes au pouvoir en Algérie. Les souvenirs de la décennie sanglante ont été relayés par les parents des jeunes révolutionnaires à l’origine du mouvement. Très méfiants de ce fait à l’égard de l’islamisme en politique, ces derniers ont cependant accepté le soutien apporté par des activistes rigoristes. Ainsi, parmi les acteurs de la révolte pacifique, des groupes islamistes entendent bien s’élever grâce au jeu électoral de la démocratie, qu’ils soutiennent désormais. Ils justifient leur légitimité par l’islamisation massive et profonde des différentes couches sociales de la population algérienne depuis les années 1990.
Classification of Spondylolisthesis
Authors: Batra Sahil , Garg Bhavuk
Published: January 2021

The restoration of global sagittal balance has become the keystone over the past decade. Various classification systems have been proposed for lumbosacral spondylolisthesis. This article describes the evolution, validation, and usage of these classification systems in the clinical setting in the current scenario.
Choriocapillaris Involvement in Acute Syphilis Posterior Placoid Chorioretinitis Is Responsible for Functional Impairment and Points Towards An Immunologic Mechanism
Authors: Herbort Carl P , Papasavvas Ioannis , Mantovani Alessandro
Published: January 2021

Purpose:

To evaluate the multimodal imaging of acute syphilitic posterior placoid chorioretinitis (ASPPC) lesions in order to elucidate their pathophysiology which seems to resemble choriocapillaritis as in primary inflammatory choriocapillaropathies such as multifocal choroiditis (MFC) and acute posterior multifocal placoid pigment epitheliopathy (APMPPE).

Methods:

Charts of patients with ASPPC seen in the Centre for Ophthalmic Specialised Care, Lausanne, Switzerland, were retrieved. Fundus autofluorescence (FAF), spectral domain optical coherence tomography (SD-OCT), fluorescein angiography (FA), indocyanine green angiography (ICGA), and when available, OCT angiography were analyzed and compared to a case of MFC.

Results:

One woman aged 58 and 2 men aged 50 and 31 with unilateral ASPPC were analyzed. All had positive syphilis serologies (venereal disease research laboratory [VDRL] and treponema Pallidum hemagglutination assay [TPHA]). Two were human immunodeficiency virus (HIV) positive. Mean best corrected visual acuity was 0.2 ± 0.1 at presentation and 1.0 for all patients 6 weeks later, after antibiotic treatment for neurosyphilis. All had central scotomata with a mean defect (MD) of 12.2 ± 2.6. Six weeks later, MD values were 3.9 ± 1.7. Microperimetry had a mean score of 25/560 at presentation and recovered to a mean of 444/560 6 weeks later. Multimodal imaging features consisted of FA tissue staining, ICGA hypofluorescent choriocapillaris non-perfusion, FAF hyperautofluorescence, and loss of the ellipsoid line in the diseased areas. The findings were consistent and identical in ASPPC and a case of MFC and pointed toward the involvement of the choriocapillaris.

Conclusions:

Similarities seen in multimodal imaging features in ASPPC and choriocapillaritis highlight the role of the choriocapillaris in the pathophysiologic mechanism of both conditions. Inflammatory choriocapillaris non-perfusion triggered by infectious agents seems to be the common pathway through which the eye is reacting.
Corneal and Ocular Residual Astigmatism in School-Age Children
Authors: Heydarian Samira , Sardari Sara , Heidari Zahra , Yekta Abbas Ali , Ostadimoghaddam Hadi , Khabazkhoob Mehdi
Published: January 2021

Purpose:

To determine the distribution of residual and corneal astigmatism (CA) in children aged 6–18 years and their relationship with age, sex, spherical equivalent, and biometric parameters.

Methods:

In this cross-sectional study, multi-stage stratified cluster sampling was done to select students from Dezful, a city in Southwestern Iran. Examinations included the measurement of visual acuity with and without optical correction, refraction with and without cycloplegia, and biometry using the Biograph (Lenstar, Germany). The main outcomes in this report were corneal and residual astigmatism. The CA was measured by Biograph (difference between k1 and k2), and residual astigmatism was calculated using Alpine method. The power vector method was applied to analyze the data of astigmatism.

Results:

Of 864 students that were selected, 683 (79.1%) participated in the study. The mean residual and CA were -0.84 diopter (D) and -0.85 D, respectively. According to the results of J0 and J45 vectors, residual astigmatism was -0.33 D and 0.04 D, and CA was 0.38 D and 0.01 D, respectively. With-the-rule (WTR), against-the-rule (ATR), and oblique astigmatism were seen in 3.4%, 66.8%, and 4.5% of the children with residual astigmatism and 67.94%, 1.3%, and 1.5% of the children with CA. Residual astigmatism decreased with an increase in spherical refractive error, whereas CA increased with an increase in spherical refractive error.

Conclusion:

The results of the present study showed a high prevalence and amount of residual astigmatism with ATR pattern among the 6–18-year-old population and the compensatory effect of this type of astigmatism on CA that mostly followed a WTR pattern.
An Unusual Case of Gastric Lymphoma Presenting as Linitus Plastica
Authors: Vishwanathan Vidya , Malhotra Aditi , Dharwadkar Arpana , Vimal Shruti , Gore Charusheela , Kumar Harsh
Published: January 2021

Disorders of the stomach are frequently seen as clinical diseases. Of all the lesions of the stomach, inflammatory conditions and neoplastic lesions are most common. Primary malignant lymphoma of the stomach accounts for only a small percentage (about 10%) of all malignant tumors of the stomach, and majority of them arise from B-cells. Most common among these are indolent extranodal marginal zone lymphomas, and in the stomach, they are called MALTomas. Occasionally, gastric lymphomas of one type or another are seen adjacent to adenocarcinoma. Sometimes, lymphoma precedes carcinoma by several years. The aim was to study the microscopic patterns of gastric biopsies and mastectomy specimens received for the case in our department. Multiple gastric biopsy specimens as well as gastrectomy specimens were received in our department. Multiple sections were taken and stained with hematoxylin and eosin. Immunohistochemical (IHC) stains were used as applicable. Studies posed a diagnostic difficulty by showing picture of gastritis from biopsy of the cardia; signet ring cell adenocarcinoma was seen in small gastrointestinal biopsies from lesser curvature and gastric lymphoma with gross picture of linitis plastica on gastrectomy specimen. For confirmation and to know the type of gastric lymphoma, multiple B- and T-cell IHC markers were used. CD20, CD10, BCL2, and c-Myc were positive in tumor cells, CD3 positivity was seen in reactive T-cells, and MIB1 positivity was seen in 70%–75% of tumor cells. Hence, it was confirmed to be high-grade large cell lymphoma (double-expresser type). Hence, it can be concluded that IHC markers are necessary to solve the diagnostic difficulties.
A Case of Herpes Simplex Encephalitis
Authors: Benachinmardi Kirtilaxmi , Chikkannaiah Panduranga
Published: January 2021

Opportunistic infections acquired during the chemotherapy forms the main limiting factor in the management of acute myeloid leukemia. Bacterial infections are most common, followed by fungal and rarely viral. Alcohol in high doses and long-term consumption also decreases the immunological response. Here, we present a unique case of herpes simplex encephalitis in a 50-year-old male patient who has presented with altered behavior, slurring of speech, disorientation, fever on and off, and confusion for 2 days. He was a known case of acute myeloid leukemia and treated with chemotherapy 5 years back. Moreover, he was also a chronic alcoholic for many years and stopped 1 week before the symptoms. The possible mechanism of immunodeficiency by chemotherapy and alcohol are discussed.
Microfilaria in Breast Masquerading as a Breast Lump
Authors: Deshmukh Abhay Vilas , Shivkumar Vitaladevuni Balasubramanyam , Vaidya Vihanka Devchand , Gangane Nitin M.
Published: January 2021

Filariasis is one of the common health problems in India. Extranodal filariasis occurs rarely, and the breast is one of the uncommon sites. Here, we report two cases of breast filariasis in the middle-aged females presented with a painless lump in the left breast. These cases were clinically mistaken as a malignancy. Cytology smears showed numerous microfilariae in both coiled and uncoiled forms along with benign ductal cells. Thus, the diagnoses of filariasis breast probably arising from intramammary lymph nodes were made in both cases. The patients were treated conservatively, and the recovery was uneventful. Thus, fine-needle aspiration cytology played an important role to avoid unnecessary surgical intervention in these patients.
Inadvertent Esophageal Migration of Endotracheal Tube used to Guide Orogastric Tube
Authors: Gangakhedkar Gauri Raman , Buddhi Madhavi , Toal Sneha , Soitkar Rohan , Patel Rajendra Dahyabhai , Sundaram Sridhar
Published: January 2021

In patients undergoing ambulatory laparoscopic surgeries, Ryles tubes are required only for the purpose of intraoperative gastric decompression. Insertion of nasogastric tubes can lead to nasal trauma, and hence, oral tubes provide a feasible alternative. In contrast to the nasopharyngeal cavity, whose anatomical orientation allows ease of insertion into the esophagus, oral insertion of Ryles tube is difficult on account of a larger cavity and potential for coiling. Various aids are often used to ease the insertion of these orogastric tubes. One such aid is the use of an oral endotracheal tube (ETT). This case report aims to bring to light, and the inadvertent complications may occur with the improper use of these aids, which in our case, was the misplacement of the said oral ETT.
Creating a Database for Psychiatric Disorders in the Community of an Urban and Rural Industrial Areas of Pimpri-Chinchwad
Authors: Saldanha Daniel , Chaudhury Suprakash , Mujawar Swaleha , Banerjee Amitav
Published: January 2021

Mental Health Issues are an important public health problem. It has also social and economic costs. The Government of India is implementing the National Mental Health Program which includes upgrading of Psychiatry services of the medical colleges so as to provide community psychiatry services. This concept paper discusses the modalities of setting up a data base of psychiatric illnesses in the field practice areas of a medical college located in the twin township of Pimpri-Chinchwad, Pune District, Maharashtra. This database will enable practice of community psychiatry in collaboration with the Department of Community Medicine and can be a model for adoption in other medical institutions and nonteaching public hospitals as well as private hospitals. Most psychiatric illnesses require follow up and a good digital tracking system would minimise attritions. It would also facilitate community based research in mental disorders.
Anatomical and Clinical Characteristics of Paediatric and Adult Eyes
Authors: Sunita Mittal , Manisha Sharma , Sanjeev Mittal Kumar , Ravi Kumar Satish , Aarzoo Juneja , Ajai Agrawal
Published: January 2021

The human eye is one of the special sensory organs. Eyes undergo a series of changes right from infancy to attainment of adulthood. Major changes occur in globe dimensions, orbital and neurological structures. In order to have a sharp focus of the image on the retina, the intraocular structures undergo developmental changes in the 1st year of life along with the neurological growth which enables processing of that retinal image. The extraocular growth of the bony orbit and adnexa accompanies intraocular growth. An ophthalmologist looking after the pediatric patient must be aware of these physiological changes so as to not diagnose them as any pathologic conditions. There are few diseases which can also interfere with these normal developmental changes. It is valuable to know the developmental process to diagnose children with eye disorders. This review article lays emphasis on the normal anatomical alterations in the globe, anterior segment, pupil, lens, retina, lacrimal apparatus, and external orbit of the human eye during infancy and early adulthood and also discussing its practical implications.
Cadaveric Study of Topographical Location and Arterial Diameter of Superficial Palmar Arch with its Clinical Implication
Authors: Varalakshmi K. L.
Published: January 2021

Background:

During the surgical exposure of carpal tunnel, it is possible to injure neurovascular structures, especially the superficial palmar arch (SPA) due to its proximity to the flexor retinaculum. Hence, the topographical location of SPA is necessary to avoid iatrogenic injuries. Size of the vessels forming SPA is important to carry out new procedures in the microsurgical techniques in reconstructive surgeries.

Materials and Methods:

The present study was conducted on 40 cadaveric hands obtained from AJ Institute of Medical science, Mangalore. The distance between the SPA and distal wrist crease (DWC) and Kaplan's cardinal line (KCL) were measured. Diameters of arteries which are mainly contributing in the formation of SPA and its branches were measured with a digital caliper, and mean and standard deviation were calculated.

Results:

The distance of SPA, from DWC was 44.22 ± 4.98 mm and from KCL along the lateral and medial border of ring fingers was 8.32 ± 1.01 mm and 9.54 ± 0.95 mm, respectively. The average diameter of the ulnar artery was 2.84 mm; radial artery was 2.79 mm; the superficial palmar branch of the radial artery, princeps pollicis artery, and the median artery was 1.5 mm, 1.24 mm, and 2.025 mm, respectively.

Conclusion:

The results of the present study on the location of the SPA as well as arterial diameters will be of great help for the surgeons and radiologists. Advances in reconstructive surgeries of the hand, especially microsurgeries has entailed a better understanding of arterial variations, in-depth knowledge of which is necessary for the positive outcome of surgical procedures.
Simulation of nitrate and potassium concentrations in soil solution using parametric models and Hydrus-2D
Authors: Conceição Beatriz Santos , Coelho Eugênio Ferreira , Silva Junior João José da , Sant’Ana José Antonio do Vale , Martinez Mauro Aparecido
Published: January 2021

This study estimated the nitrate and potassium concentration in the soil solution of drainage lysimeter using the mathematical models developed by Vogeler et al. (1996) and Muñoz-Carpena et al. (2005) and the computational model Hydrus-2D, while comparing the simulated and observed data using statistical parameters. The cultivar used for the study was ‘Prata Gorutuba’. The experimental plots were six lysimeters of drainage. Fertigation was performed weekly. The mathematical models developed by Vogeler et al. (1996) and Muñoz-Carpena et al. (2005) were used to determine the specific concentration of a given ion (Ci). The Hydrus software was used to simulate the dynamics of nutrients. The concentrations of nitrate and potassium in the soil solution were estimated by the model of Vogeler et al. (1996), adapted to the linear type CEw-Ci ratio and simulated by the Hydrus model, resulting in an acceptable characterization of the distribution of these nutrients.
Assessing glyphosate concentrations in six reservoirs of Paraíba do Sul and Guandu River Basins in southeast Brazil
Authors: Cristofaro Carolina Da Silva , Branco Christina Wyss Castelo , Rocha Maria Isabel de Almeida , Portugal Samira Da Guia Mello
Published: January 2021

Glyphosate is a popular herbicide used worldwide, and several studies consider it to be an environmental hazard affecting human health. The present study aimed to detect glyphosate in six different reservoirs of Paraíba do Sul and Guandu River Basins in Southeast Brazil, used for multiple purposes, including fishery activities and domestic water supply. Ion chromatography was used to analyze the water samples, as it is a fast and environmentally friendly technique to detect glyphosate. Our results revealed that, despite differences related to trophic state, season of the year or distance to urban areas, glyphosate was detected in all reservoirs and in three of them with concentrations above the limit imposed by Brazilian legislation. Among the environmental variables studied, turbidity presented the highest correlation with glyphosate concentrations. The effect of rainfall increasing turbidity in the rivers reinforces the importance of draining waters from surrounding areas that transport glyphosate into the aquatic ecosystems. The detection of the herbicide in the various systems confirms the wide use of this compound in the drainage basins of the studied reservoirs and highlights the importance of water monitoring. Further, the results reveal how urgent and important it is to explore through laboratory experiments the pathways of degradation of this herbicide in tropical and subtropical aquatic environments together with its effects on flora and fauna.
The role of food/microorganism ratio in denitrification reactors: how it affects the sizing and operation of the denitrification process
Authors: Gavasci Renato , Lombardi Francesco , Raboni Massimo
Published: January 2021

Two calculation models of the Specific Denitrification Rate (SDNR) are analyzed to highlight the sensitivity of this parameter to the Food:Microorganisms ratio in the denitrification reactor (F:MDEN). One of these models is empirical while the second was elaborated on a deterministic basis. Both models reveal a linear dependence of SDNR20°C on F:MDEN and in a first approximation they are comparable only in a narrow range of concentration of dissolved oxygen (DO) in denitrification, specifically DO=0.25-0.35 mg L-1. These values frequently occur in well designed and well operated sewage treatment plants. Outside this range, the role of F:MDEN must necessarily be examined in combination with DO because of the relevant influence of the latter on the efficiency of the denitrification process.
The The Role of Public Order Regulations as Acts of Local Law in the Performance of Tasks in the Field of Public Security by Local Self-government in Poland
Authors: Kostrubiec Jaroslaw
Published: January 2021

The subject of the article are the issues concerning the enactment by local self-government bodies in Poland of a special category of acts of local law, i.e. public order regulations. Public order regulations belong to the sources of universally binding law in Poland. Not only government administration bodies, but also local self-government may adopt them. By means of public order regulations, such values as: life, health, property of citizens, environment, public order, peace and public security are protected. The status of public order regulations in the Polish legal order, which are bodies of local self-government units to protect the life or health of citizens and to ensure public order, peace and security, is not the subject to clear legislation or consent among scholars in the field and in relevant case-law. Therefore, the aim of the article is to determine the legal status of local law acts in the form of public order regulations in Poland and to define their role in the performance of tasks in the field of public security by local self-government. The author refers also to relevant legal solutions applicable in other member states of the Visegrad Group. The main thesis of the article is a statement that acts of local law in the form of public order regulations are a desirable manifestation of the law-making decentralisation of the state, which is necessary for the effective performance of tasks in the field of public security by local self-government bodies.