bluuebunny/crossref_metadata_2025 huggingface dataset:
Target Localization Algorithm of Wireless Sensor Network Based on Fast Orthogonal Matching Pursuit in
Authors: Li Xiaoqiang , Chen Jianfeng , Zhang Rongrong , Wen Yang , Tan Weijie
Published: May 2020

Efficient localization of multiple targets is one of the basic technical problems in wireless sensor networks (WSN). The traditional sparse representation method based on greedy class is not efficient in multi-target positioning. Aiming at this problem, a multi-target localization algorithm based on QR decomposition for fast orthogonal matching pursuit is proposed. The algorithm meshes the wireless sensor coverage area to design an over-complete dictionary, which transforms the multi-target localization problem into a sparse signal recovery problem. The method utilizes the sensor to receive the sparse characteristics of the target signal strength, and then uses fast orthogonal matching pursuit to recover the measured values, thereby localization the target by sparsity. Through the QR decomposition of the column full rank matrix, the recursive form is used to invert the sub-dictionary matrix, thus avoiding the direct inversion of the matrix in the traditional method, so that the computational complexity is greatly reduced. The simulation results show that compared with the traditional orthogonal matching pursuit compressed sensing reconstruction method, this method does not lose the localization accuracy and improves the computational efficiency.
Establishment and Simulation of Twelve-Degree-of-Freedom Model for UAV Parachute Recovery System
Authors: Wu Han , Wang Zhengping , Zhou Zhou , Wang Rui
Published: May 2020

In the UAV parachute recovery process, the UAV and the parachute have always been in the state of dynamic balance, so it is difficult to deal with the constraint between them. In order to solve this problem, the UAV parachute recovery system was divided into three parts:the parachute, riser and UAV. The extension length of riser was obtained by the velocity relationships of the riser connection points. The riser tension was obtained by the product of the elastic coefficient and the extension length of the riser. And it was applied to the parachute and UAV systems respectively. Finally, based on the Newton-Euler equation, the 12-DOF model of UAV parachute recovery system was established, in which the unsteady aerodynamic model of the UAV from the forward flight to the steady descents was established based on the ONERA equation. The simulation and test results shows:the 12-DOF model is consistent with the results of the experimental data, which verifies the accuracy of the 12-DOF model. The 12-DOF model is more accurate than the past 6-DOF model. This model established in this paper can provide reference for the selection of parachute in the UAV parachute recovery system and the determination of the landing point of the UAV.
Group-Based Uplink OFDMA Random Access Algorithm for Next-Generation WLANs
Authors: Yang Annan , Li Bo , Yang Mao , Yan Zhongjiang
Published: May 2020

The traditional wireless local area network(WLAN) standard, IEEE 802.11, adopts carrier sense multiple access/collision avoidance(CSMA/CA) mechanism to allow a single user to compete for channel access. The upcoming WLAN standard, IEEE 802.11ax, combines orthogonal frequency division multiple access(OFDMA) technology with random access, and use Uplink OFDMA Random Access(UORA) technology as uplink random access. Therefore, UORA which allow multiple users to access channel at the same time can improve the utilization of network resources. Although UORA technology in IEEE 802.11ax has the advantage of low signaling overhead, when the number of users of network is large, the increase of random access collisions will lead to the decrease of network throughput. Therefore, we propose a group-based UORA method. As a central scheduling node, Access Point(AP) divide Stations(STAs) and resources to groups and sets different GroupID for different groups. STAs can only access resources with the same GroupID randomly. The validity of group-based UORA method is verified by mathematical model analysis and simulation. The network throughput of our group-based UORA is higher than that of the original UORA in IEEE 802.11ax, so it has great practical significance.
Akut-auf-chronisches Leberversagen (ACLF)
Authors: Busch Markus , Maasoumy Benjamin , Simon Susanne , Stahl Klaus
Published: May 2020

Komplikationen einer Leberzirrhose haben eine schlechte Prognose. Doch während das Risiko, an einer hepatischen Enzephalopathie oder einer Ösophagusvarizenblutung zu sterben, kontinuierlich abgenommen hat, ist das Risiko, an einer Sepsis zu sterben, immer größer geworden. Aus verschiedenen Gründen ist es sinnvoll, das Akut-auf-chronische Leberversagen mit seinem charakteristischen Hyperinflammationssyndrom als eigene klinische Entität abseits der traditionellen dekompensierten Zirrhose zu definieren. Der folgende Artikel führt in das Krankheitsbild ein und stellt die Auslöser, die systemischen Folgen und die komplexe Therapie praxisorientiert dar.
Extrakorporale Therapiestrategien in der Sepsis
Authors: David Sascha
Published: May 2020

Sepsis ist eine lebensbedrohliche Organdysfunktion, hervorgerufen durch eine pathologische Wirtsantwort auf eine Infektion. Eine spezifische Therapie hiergegen wäre wünschenswert, konnte aber bisher nicht etabliert werden. Die Blockade einzelner Komponenten des Immunsystems (z. B. TNF, TLR4) lieferte zwar überzeugende Resultate in der präklinischen Forschung, scheiterte jedoch in kontrollierten klinischen Studien. Daher ist eine nicht selektive Elimination verschiedener zirkulierender Faktoren in den letzten Jahren in den Fokus wissenschaftlichen Interesses gerückt. In dieser Übersicht werden unterschiedliche extrakorporale Verfahren und deren Evidenz zur Therapie der Sepsis vorgestellt. Der therapeutische Plasmaaustausch nimmt in gewisser Weise eine Sonderstellung ein, da neben der Elimination schädigender Substanzen gleichzeitig durch die Sepsis verbrauchte protektive Faktoren ersetzt werden können. Zusammenfassend handelt es sich um innovative Apparaturen auf dem Boden eines überzeugenden theoretischen Konzeptes mit teilweise guten Effekten in kleinen Pilotstudien. Randomisiert kontrollierte Studien sind jedoch rar, sodass belastbare Daten bis dato leider fehlen.
Efficient Pd-Catalyzed Hydrodehalogenation of o-Haloanilides in Water
Authors: Mao Zewei , Tang Yanling , Li Minxin , Gao Hui , Rao Gaoxiong
Published: May 2020

In the present work, we have developed a practical methodology for the hydrodehalogenation of o-haloanilides using PdCl2 at 100 °C under mild conditions in water. The catalytic system could selectively dehalogenate both aryl chloride and aryl bromide and exhibit a broad functional group tolerance.
Anion-Accelerated Aromatic Oxy-Cope Rearrangement in Geranylation/Nerylation of Xanthone: Stereochemical Insights and Synthesis of Fuscaxanthone F
Authors: Matsumoto Takashi , Fujimoto Yuuki , Takahashi Kanae , Kobayashi Ryouma , Fukaya Haruhiko , Yanai Hikaru
Published: May 2020

An efficient installation of a 3,7-dimethylocta-2,6-dien-1-yl (geranyl or neryl) side chain at the C(1) position of a xanthone core by utilizing an anion-accelerated aromatic oxy-Cope rearrangement is described. Experiments revealed that this uncommon rearrangement takes place in a stereospecific manner through a chair-like transition-state structure. An application to the syntheses of the natural xanthone fuscaxanthone F, possessing a geranyl side chain, and its neryl analogue is also described.
Biomarker for Asymptomatic Apical Periodontitis in Gingival Crevicular Fluid: aMMP-8
Authors: Karteva Teodora , Manchorova-Veleva Neshka
Published: May 2020

Objectives Asymptomatic apical periodontitis (AAP) is one of the most widespread chronic inflammatory diseases in the field of dental medicine. Active matrix metalloproteinase (aMMP-8) previously demonstrated diagnostic potential as a biomarker for AAP in gingival crevicular fluid (GCF). The aim of this study was to determine the levels and diagnostic accuracy of aMMP-8 in GCF from teeth with AAP.

Materials and Methods In this cross-sectional study, GCF samples were obtained from teeth with AAP (sample group, n = 31) and their contralateral teeth (control group, n = 31). Clinical and cone beam computed tomography (CBCT) parameters were used for the diagnosis and assessment of AAP and the determination of clinically healthy marginal periodontal tissues. One pool GCF sample per tooth was obtained from the whole crevice’s perimeter. aMMP-8 levels were determined by enzyme-linked immunosorbent assay (ELISA).

Statistical Analysis Wilcoxon signed ranks test and Spearman rank correlation coefficient (rs) were used as statistical tools. The significance level was set at p < .05.

Results The two groups demonstrated biomarker levels corresponding to a healthy marginal periodontal tissue. aMMP-8 levels were statistically and significantly higher in the samples collected from teeth with AAP. Lesions with greater volume showed correspondingly larger diameters. No statistically significant correlation between aMMP-8 levels and lesions’ volume or diameter was discovered.

Conclusion GCF composition is modified by AAP only to a minimal extent. Further research is needed to substantiate the utilization of aMMP-8 as a potential biomarker for the diagnosis of the disease as well as to explore its relationship with other biomarkers.
The Quality of Web Sites' Health Information on Minimal Invasive Repair of Pectus Excavatum Using the DISCERN Instrument
Authors: Zuidema Wietse P. , Graumans Maarten J. , Oosterhuis Jan W. A. , van der Steeg Alida F. W. , van Heurn Ernest
Published: May 2020

Introduction The Internet is a frequently used tool for patients with pectus excavatum (PE) to get information about symptoms and treatment options. In addition, it is used by both health care providers as a marketing tool and support group systems. The Internet health information varies in precision, quality, and reliability. The study purpose was to determine the quality of information on the PE Web sites using the DISCERN instrument, including information about operation and potential complications after a Nuss bar procedure.

Materials and Methods Four search engines, Google, Yahoo, Ask, and Bing, were used to explore seven key terms concerning PE. Search language was English. The DISCERN quality instrument was used to evaluate the Web sites. Also, information on possible complications was scored per Web site.

Results A total of 560 Web sites were assessed in March 2019. Excluded were 139 Web sites. There were 333 duplicates, leaving 88 unique Web sites. Of these, 58.1% were hospital-related information Web sites, 28.4% medical information Web sites, and 3.4% patient forum sites. Interactive multimedia was used on 21.6% of the sites. Pain postoperatively was mentioned on 64.8% of the sites, while only 9.1% mentioned the mortality risk of the surgical correction of PE for Nuss bar placement. The quality of the unique Web sites showed a mean DISCERN score of 42.5 (standard deviation 12.2). Medical information Web sites, encyclopedia, and government-sponsored sites had higher DISCERN scores. Hospital-related information sites, medical companies, and lay persons' sites, had lower total scores.

Conclusion The overall quality of PE Web sites is low to moderate, with serious shortcomings.
How blobs affect plasma dynamics in tokamaks
Authors: Bandari Anashe
Published: May 2020

The inelastic interactions between blobs and neutral particles can impact shoulder formation in a tokamak plasma through ionization and charge-exchange collisions.
Water structure near the surface of Weyl semimetals as catalysts in photocatalytic proton reduction
Authors: Gujt Jure , Zimmer Peter , Zysk Frederik , Süß Vicky , Felser Claudia , Bauer Matthias , Kühne Thomas D.
Published: May 2020

In this work, second-generation Car–Parrinello-based mixed quantum-classical mechanics molecular dynamics simulations of small nanoparticles of NbP, NbAs, TaAs, and 1T-TaS2 in water are presented. The first three materials are topological Weyl semimetals, which were recently discovered to be active catalysts in photocatalytic water splitting. The aim of this research was to correlate potential differences in the water structure in the vicinity of the nanoparticle surface with the photocatalytic activity of these materials in light induced proton reduction. The results presented herein allow explaining the catalytic activity of these Weyl semimetals: the most active material, NbP, exhibits a particularly low water coordination near the surface of the nanoparticle, whereas for 1T-TaS2, with the lowest catalytic activity, the water structure at the surface is most ordered. In addition, the photocatalytic activity of several organic and metalorganic photosensitizers in the hydrogen evolution reaction was experimentally investigated with NbP as the proton reduction catalyst. Unexpectedly, the charge of the photosensitizer plays a decisive role for the photocatalytic performance.
Reliability of leaf functional traits after delayed measurements
Authors: Thakur Dinesh , Singh Lakhbeer , Chawla Amit
Published: May 2020

In this study, the effect of temporary storage (at 4°C) on measurement of leaf traits was tested. We collected leaf samples from 25 species, which represented different functional types in the high altitude vegetation of western Himalaya, to measure leaf area (LA), leaf rehydration, specific leaf area (SLA) and leaf dry matter content (LDMC). Repeated trait measurements were performed for up to 7 days. We found that in all the species, LA increased in initial 24 h of rehydration and thereafter remained stable. Leaf rehydration was found to be sensitive to delayed measurements and changed significantly for up to 7 days. For SLA and LDMC, the effect of storage time was significant only for a few species. On the basis of our findings, we recommend that, for samples stored in dark at 4°C, LA, SLA and LDMC can reliably be estimated after a delay of up to 7 days. Further, these key leaf traits should be estimated only after 24 h of rehydration. Also, trait measurements after prolonged rehydration of leaves should be avoided. Outcomes of this study will be beneficial when a large number of samples are collected from locations far away from laboratory and temporary storage is necessitated before trait measurements.
Interactions between crop sequences, weed populations and herbicide use in Western Australian broadacre farms: findings of a six-year survey
Authors: Harries Martin , Flower Ken C. , Scanlan Craig A. , Rose Michael T. , Renton Michael
Published: May 2020

Six years of survey data taken from 184 paddocks spanning 14 million ha of land used for crop and pasture production in south-west Western Australia were used to assess weed populations, herbicide resistance, integrated weed management (IWM) actions and herbicide use patterns in a dryland agricultural system. Key findings were that weed density within crops was low, with 72% of cropping paddocks containing fewer than 10 grass weeds/m2 at anthesis. Weed density and herbicide resistance were not correlated, despite the most abundant grass weed species (annual ryegrass, Lolium rigidum Gaudin) testing positive for resistance to at least one herbicide chemistry in 92% of monitored paddocks. A wide range of herbicides were used (369 unique combinations) suggesting that the diversity of herbicide modes of action may be beneficial for reducing further development of herbicide resistance. However, there was a heavy reliance on glyphosate, the most commonly applied active ingredient. Of concern, in respect to the evolution of glyphosate resistant weeds, was that 45% of glyphosate applications to canola were applied as a single active ingredient and area sown to canola in Western Australia expanded from 0.4 to 1.4 million hectares from 2005 to 2015. In order to minimise the weed seed bank within crops, pastures were used infrequently in some regions and in 50% of cases pastures were actively managed to reduce weed seed set, by applying a non-selective herbicide in spring. The use of non-selective herbicides in this manner also kills pasture plants, consequently self-regenerating pastures were sparse and contained few legumes where cropping intensity was high. Overall, the study indicated that land use selection and utilisation of associated weed management actions were being used successfully to control weeds within the survey area. However, to successfully manage herbicide resistant weeds land use has become less diverse, with pastures utilised less and crops with efficacious weed control options utilised more. Further consideration needs to be given to the impacts of these changes in land use on other production factors, such as soil nutrient status and plant pathogens to assess sustainability of these weed management practices in a wider context.
Turn-taking management in interpreted legal aid lawyer-client
interviews
Authors: Xu Han
Published: May 2020

In interpreted encounters, it is important for
the primary speakers to follow turn-taking rules. However, in real
practice, overlapping speech and lengthy turns at talk happen from
time to time, creating difficulty for the interpreter to perform
adequately. Generating data from observations of authentic
interpreted lawyer-client interviews in Australia, this study
examines how lawyers and interpreters manage turns. Findings show
that the two professionals work in a relationship featuring shifting
alignment and confrontation. Most of the time, lawyers work
collaboratively with the interpreters to manage turns to facilitate
interpreting; at other times, they compete for turns to achieve
their own goals. Better professionally qualified interpreters are
more capable of managing discourse and meeting ethical requirements
in cases of conflict with lawyers.
Music, metaphor, and creativity
Authors: Zbikowski Lawrence M.
Published: May 2020

This chapter explores the resources for meaning construction provided by music and how musical communication exemplifies creativity. Using two short passages from Haydn’s The Creation as examples, the chapter investigates how musical sounds are correlated with nonmusical phenomena through analogy, a cognitive process related to but distinct from metaphor. The relationship between analogy and metaphor is considered in some detail and connected to explanations of musical meaning construction that draw on semiotics and conceptual metaphor theory. This explanatory framework is extended to musical metonymy, illustrated by an example from Beethoven’s Pastoral Symphony. The chapter proposes that nonlinguistic forms of communication like music provide important insights into analogy, metaphor, and metonymy, and thus into the study of human creativity.
“Born from the heart”
Authors: Calvo-Maturana Coral
Published: May 2020

This paper explores the adoption narratives that run across a selection of children’s picture books and how they are built through the creative integration of linguistic and pictorial patterns, specifically as depicted in metaphors. The main aim is thus to uncover the way in which adoption is shaped and portrayed in these books, challenging constrictive and learnt discourses in society. The project draws on the four pictorial categories identified in Forceville (1996): contextual or MP1, hybrid or MP2, simile, and verbo-pictorial, as well as the concept of multimodal metaphor (Forceville and Urios-Aparisi, 2009) already suggested in the verbo-pictorial category. These narratives create an accessible space for children to delineate their understanding of families and construct their own identity.
Coordination of linguistic subsystems as a sign of
automatization?
Authors: Hou Junping , Loerts Hanneke , Verspoor Marjolijn H.
Published: May 2020

This study explored retrodictively differences in
developmental patterns between a learner who makes some progress and one
that does not. Their twelve successive writings were analyzed on
holistically scored measures of complexity, accuracy, fluency, idiomaticity,
and coherence (CAFIC) and on two analytical measures to operationalize
syntactic and lexical complexity. Their developmental trajectories were
explored with visual graphs (LOESS curves), Monte Carlo analyses, and
correlational analyses. The stronger learner showed rather synchronous
development in most measures and a significant jump in lexical complexity
(operationalized as average word length), suggesting a level of coordination
of subsystems and therefore automaticity of the system as a whole. The
weaker learner, on the other hand, showed more competitive or random
patterns in the measures.
Quantum Secure Multiparty Computation with Symmetric Boolean Functions*
Authors: Cao Hao , Ma Wenping , Liu Ge , Lü Liangdong , Xue Zheng-Yuan
Published: May 2020

We propose a class of n-variable Boolean functions which can be used to implement quantum secure multiparty computation. We also give an implementation of a special quantum secure multiparty computation protocol. An advantage of our protocol is that only 1 qubit is needed to compute the n-tuple pairwise and function, which is more efficient comparing with previous protocols. We demonstrate our protocol on the IBM quantum cloud platform, with a probability of correct output as high as 94.63%. Therefore, our protocol presents a promising generalization in realization of various secure multipartite quantum tasks.
Synthesis of Polycrystalline Diamond Compact with Selenium: Discovery of a New Se–C Compound*
Authors: Wang Wen-Dan , Li Ao , Xu Guo-Heng , Wang Pei , Liu Yue-Gao , Wang Li-Ping
Published: May 2020

Sintering of polycrystalline diamond with selenium was investigated under pressure of 6.5–10.5 GPa at a constant temperature of 1850 °C. A new carbon-selenium compound with a most plausible chemical formula of SeC and a WC-type hexagonal structure (space group

P

6
¯

m
2

) has been discovered in the recovered samples sintered at 10.5 GPa and 1850 °C. Refined lattice parameters are as follows: a = 2.9277(4) Å, c = 2.8620(4) Å, V = 21.245(4) Å3. The diamond compacts hot-pressed at 10.5 GPa have excellent mechanical properties with a Vickers hardness of about 68 GPa at a loading force of 19.6 N. Diamond intergrowths observed in these samples may have benefited from the catalytic effects of Se/SeC on the nucleation and crystal growth of diamond.
Electrical and microscopic characterization of p+-type layers formed in HgCdTe by arsenic implantation
Authors: Izhnin I I , Mynbaev K D , Voitsekhovskii A V , Nesmelov S N , Dzyadukh S M , Korotaev A G , Varavin V S , Dvoretsky S A , Marin D V , Yakushev M V , Swiatek Z , Morgiel J , Bonchyk O Yu
Published: May 2020

The Hall-effect (with mobility spectrum analysis) and capacitance measurements were combined with transmission electron microscopy for the study of molecular-beam epitaxy-grown n-type Hg1-xCdxTe (x = 0.22) films subjected to various operations used in the fabrication of p
+-n photodiode structures. The operations included arsenic ion implantation, activation annealing and extra annealings aimed at investigation of the details of the p
+-n junction formation. A detailed characterization of p+-type layers formed by the implantation was done. A high degree of arsenic activation by activation annealing was demonstrated, along with the annihilation of implantation-induced extended (dislocation loops) and quasi-point defects, and the disappearance of electrically active centres associated with them. The annealing was also shown to cause the activation of residual acceptors, changing the degree of electrical compensation in the n-‘base’ of some of the p
+-n structures.
Latest Results of the STEREO Experiment: a Search for a Sterile Neutrino at Very Short Baseline
Authors: Blanchet Adrien
Published: May 2020

The increasingly precise study of antineutrinos spectra from reactors has revealed a deviation between the prediction and the measurements, which could indicate the existence of a new neutrino. This new neutrino state would not couple with the weak interaction (a sterile neutrino) and its mass would be around 1eV/c2. The STEREO experiment aims at testing this hypothesis using a gadolinium-loaded liquid scintillator in a segmented neutrino target at 10 meters distance from the compact core of the ILL research reactor, in Grenoble (France). The hypothesis of an oscillation towards a light sterile neutrino is tested by performing a relative comparison of measured

v
¯

e

spectra between cells. The data recorded during 119 (211) days of reactor turned on (off) are compatible with the null oscillation hypothesis and reject the original best-fit of the RAA at 99.8 % C.L. The analysis efforts are now pointing towards measurements involving absolute predictions in flux and shape of the antineutrino spectrum.
The Active Hybrid Solar Panel integrated with Fresnel Lens Concentrator
Authors: Indrasari Widyaningrum , Fahdiran Riser , Umiatin  , Habiburosid
Published: May 2020

Prototype of a hybrid solar panel equipped a Fresnel lens concentrator, and a solar tracking system has been developed. This hybrid solar panels isa combination of conventional solar cells and thermoelectric generators. Solar cells work to convert solar radiation, whereas thermoelectric generator converts solar heat into electrical energy. A Fresnel lens, a refractive lens type, is used as a solar concentrator, whereas the solar drive system uses solar azimuth data. This prototype is equipped by INA219 sensor as a measure of electric current and output voltage of solar panels. The temperature gauge uses a DS18B20 sensor, and the GY 49 MAX44009 light sensor is a light intensity detector. Solar panel drive uses MG995 servo motor and RTC module. All measured parameters arestored in the Secure Digital (SD Card) module. Through optimization, the obtained slope angle of the solar panel is 100. Meanwhile, the optimized distance of the Fresnel lens to the solar panel is 0.2 F. The addition of Fresnel lens resulted increasing 23.83 % ofthe output power of hybrid solar panelin Rawamangun - East Jakarta area.
The Development of Mathematics Lesson Equipment Based on Model Eliciting Activities (Meas) Approach to Improve Mathematical Reasoning Skill of Students Class X of Senior High School Padang(Study of Preliminary Analysis)
Authors: Irwan  , Elniati Sri
Published: May 2020

Mathematical reasoning skill of students from several schools was still not optimal yet. One of ways to solve this problem was by developing mathematics lesson equipment based on Model Eliciting Activities (MEAs) approach. This research was development research, which aimed to produce lesson equipment based on Model Eliciting Activities (MEAs) approach. From results of preliminary analysis, it was found the lesson equipment that was in accordance with students characteristics and used curriculum as well as the order of the content based on the result of concept analysis. This learning equipment wouldhave the role in improving students mathematical reasoning skill.
Evaluation of North Sumatera Cardamom seed (Amomum compactum) Extract as Antibacterial and Anticancer
Authors: Juwitaningsih Tita , Jahro Iis Siti , Sari Sri Adelila
Published: May 2020

Cardamom seeds (Amomum compactum) or Kapulaga have been used as a flavoring spice in cooking. Besides, they are also useful in traditional medicine for oral health and gizzard, treating coughs and colds, maintaining kidney and urinary health, pain medication, preventing infections, as well as smoothing digestion. This study was aimed to evaluate the acetone extract of North Sumatera A. compactum as antibacterial and anticancer. The antibacterial activity test was carried out by the paper disc diffusion method. It was then followed by determination of minimum inhibitory concentration (MIC) and minimum kill concentration (MBC) against S. aureus ATCC 25923, S. mutans ATCV 35668 and E. faecalis ATCC 49619. The cytotoxic test was performed against MCF-7 cells. It has been found that acetone extract of A. compactum showed the best activity against S.aureus ATCC 25923 with a diameter of inhibition zone was of 8.3mm with MIC and MBC values of 625µg/mL. Acetone extract of A. compactum has anticancer breast activity with IC50 value was found to be 44.7828 µg/mL.
The Effect of Ab mix Nutrient on Growth and Yield of Pak choi (Brassica chinensis L.) Plants under Hydroponic Wick System Condition
Authors: Harahap Miftah A , Harahap Fauziyah , Gultom Tumiur
Published: May 2020

This research was conducted to find out the effect of ab mix nutrient on growth and yield of Pak choi (Brassica chinensis L.) plants under hydroponic wick system condition. The research design used was non factorial Complete Randomized Design (CRD) with 5 levels of ab mix nutrient concentrations (0, 650, 1300, 1950, 2600 ppm), with 3 replications in each treatment. Each repetition consists of 6 plants, making a total 90 experimental units. The parameters observed were plant’s height, number of leaves, leaves area, fresh and dry weight, harvest index, leaf chlorophyll content, and root volume. Data was analyzed by using one way ANOVA, and DMRT as follow up. Research result shows that in hydroponic wick system ab mix nutrient gave very significant effect on pak choi (Brassica chinensis L.) parameters, such as: 1) plant’s height, 2) number of leaves, 3) leaves area, 4) dry weight 5) harvest index, and significantly effect on 6) fresh weight. However, it did not gave significant effect on root volume. The best results for each parameters observed were: number of leaves was 18.78, leaves area was 47.32 cm2, fresh weight was 33.57 gr, dry weight was 2.40 gr and harvest index was 99.15%, all were obtained from ab mix 1950 ppm treatment. The best results for plant height parameter was 8.71 cm obtained from ab mix 2600 ppm treatment.
Flavonoid Derivatives from The Leaves of Muntingiacalabura L.
Authors: Kurniadewi Fera , Dianhar Hanhan , Muktiningsih  , Kartika Irma Ratna , Aini Dewi
Published: May 2020

The Isolation and Purification of ethyl acetate fraction from Muntingiacalabura leaves have resulted three flavonoid derivatives. UV-Vis, 1H-NMR dan13C-NMR data showed that isolate compounds are 2’,4’-dihydroxychalcone (1), 3,7-dimetoxy-5-hydroxyflavone (2), and 3,5,7-trihydroxy-8-methoxyflavone (3). The antioxidant evaluation against 2,2-diphenyl-1-picrylhydrazyl (DPPH), compound (3), showedto be a very high activity (IC503,7 × 109 ppm). The isolated compounds were also evaluated for their cytotoxic activities against murine leukemia P-388 cells resulted that all isolated compounds were inactive.
Edmodo-Based E-Learning Media Development in the Field of Science
Authors: Rahmansyah Rian , Darmana Ayi , Silalahi Albinus
Published: May 2020

This research uses the Research & Development (R&D) method with quantitative and qualitative approaches conducted in schools. This research aims to develop Edmodo media in the field of science, find out the feasibility of using media, find out the response of users in using the media. Based on the feasibilitys testing of the media and the field of science conducted by 2 material expert validators and 1 media expert validator it was found that Edmodo media developed according to experts was declared feasible and could be used as a learning medium in the field of science.
Video Technology Media based on Heat and Temperature to Improve of Learner Critical Thingking
Authors: Anas Latifah Hanum , Rajagukguk Juniastel , Bunawan Wawan
Published: May 2020

Science and technology advances provide space for teachers to be able to create a variety of learning media that can be used in the learning process This study is aimes to determined the process of implementation of learning and improvement of students learning critical thingking with video technology media based on heat and temperature at class XI MIPA of MAN Serdang Bedagai. Video technology media based on heat temperature is a form of learning media that can accommodate student learning needs in accordance with the critical thingking of students. The method is quasi experimental type of research while subject of this research are students of class XI MIPA 1 dan XI MIPA 2 academic year 2019 / 2020 which consist of 60 students. Data collection techniques is test with the instrument of written test of essay that consist of 15 questions. The stages in this research are preliminary study, video design, research implementation and conclusions.
Determination on Methane Gas in Place in Coal Seam by using Volumetric Method at X Field, East Kalimantan, Indonesia
Authors: Ibrahim Eddy , Yusuf Maulana , Deniswara Yoga
Published: May 2020

PT. Virginia Indonesia Company (PT. VICO) is one of the oil and gas company which production of coal bed methane. The company is located in East Kalimantan province with the basin are processes namely Kutai Basin. Calculation of methane gas in place of coal bed can be done by several methods such as: material balance, volumetric and desorption test. Each method has its advantage and disadvantages. The method that used by PT. VICO to calculate gas in place at the moment is only the method of material balance. By using that method for calculating gas in place considered less accurate. Therefore we need other method of calculation of gas in comparison and evaluation of whether the value obtained relatively the same. One method of calculation, named volumetric method. This research will analyze the determination of the methane gas in place of coal using a volumetric method at Mutiara field PT VICO, East Kalimantan. The result of this study can be used as a reference company for comparison calculation which method already exists.
Development of Tutorial Video Media Based on Project Based Learning in Class XI State Vocational School 1 Pakam Lubuk
Authors: Rozi Fahrul , Abdul Hamid K , Panjaitan Keysar
Published: May 2020

This research aims to: (1) know the feasibility of the media Video tutorial based on the project based learning software application and interior building, and (2) to determine the effectiveness of the use of media video tutorial based project based learning on software application learning and building interiors can improve the learning outcomes of software applications and building interiors. This type of research is development research using R&D models from the Borg and Gall combined with the Dick and Carey instructional design models. The method used in this study is a quasi-experimental method. The results of the hypothesis test study prove that there are significant differences between the learning outcomes of software applications and building interiors that are studied using video based tutorials on project based learning with the learning outcomes of software applications and building interiors that use visual media.
Effect of Temperature Variation Characteristics Of Crystal Structure and Morphology of Nano TiO2 Coating On Metal Anti-Corrosion Coating by Sol-Gel Method Spin Coating
Authors: Sinulingga Karya , Sirait Makmur , Marpaung Tesya. M.
Published: May 2020

This research which was conducted to determine the best coatings on ferrous metals to prevent corrosion by using sol gel spin coating method. TiO2 coating material which is used the addition of epoxy resin binder. The comparison used in these TiO2 coatings: resin: hardener is 1:4: 4. The process of synthesis TiO2 main materials used are TiCl3, distilled and NH4OH. From mixing these materials will be obtained precipitate and then the precipitate dried at a temperature of 200 °C for 6 hours to obtain titanium powder. This coating is done by varying the temperature of 100 °C, 125 °C, 150 °C for 1 hour with rotation speed of 3500 rpm. Crystal structure testing by using the XRD where known that the crystal structure formed the anatase phase. Testing the morphological structure were performed using SEM which produce images of TiO2 cubic shape. Testing the corrosion rate showed that the coated samples is more resistant to corrosion than the uncoated samples. The rate of corrosion on metal samples without coating is 40.0320 cm/year, while the rate of corrosion on metal coated sample was 2.8420 cm/year; 3.2440 cm/year; 3.5020 cm/year. Where each temperature is 100 °C, 125 °C, 150 °C.
Characterization of K175 Concrete SNI Standards Using Volcanic Ash Aggregates With Variation in Composition
Authors: Abd Hakim S , Tarigan Kerista , Sembiring Timbangen , Situmorang Manihar , Sebayang Kerista , Tamba Lia Yulistika
Published: May 2020

K175 concrete research has been carried out with two types of volcanic ash addition, namely variations of 0%, 6%, 8%, 10%, 12% (K175 concrete) and 15%, 20%, 25%, 30% (density analysis XRD). K175 concrete contributes to residential concrete. The making of K175 concrete refers to SNI 7394: 2008 with compressive strength criteria of 14.53 Mpa. The method used is Precast concrete with sheet pile type. The making of concrete K175 with the addition of cube-shaped volcanic ash with 15 cm sides consisting of cement, sand, broken stone, volcanic ash and water. After casting is done, the concrete is soaked in the tub and then removed from the soaking tub after 28 days of age dried for 24 hours. The following is the water absorption test and compressive strength test by selecting 3 samples which have the optimum compressive strength for XRD, SEM and FTIR tests to see the concrete characterization. Analysis of XRD, SEM, and FTIR are in the variation of 0%, 10% and 25% low absorption, compressive strength respectively 21.06 MPa, 21.16 MPa and 19.46 MPa. The pressure strength also fulfills the compressive strength of Portland cement type I which is 20 MPa.
Chemical and physical pressure effects in the A-site spinel antiferromagnets CoM2O4 (M = Al, Co, and Rh)
Authors: Naka T , Valenta J , Kaštil J , Míšek M , Prchal J , Sechovský V , Abe H , Nakane T , Nakayama M , Uchikoshi T
Published: May 2020

Magnetic phase transitions under high pressure are reported for the diamond lattice antiferromagnet Co3−xRhxO4 in the range of 0 ≤ x ≤ 2.0, which is an isostructural S = 3/2 system for the well-known frustrated antiferromagnet CoAl2O4. In the Co3−xRhxO4 system, magnetic and specific-heat measurements at ambient pressure revealed that a second-order antiferromagnetic transition occurred at the Néel temperature (T
N) which exhibits a nonmonotonic x-variation. The physical pressure variations of T
N were determined by ac-calorimetry under hydrostatic pressures up to p = 2.6 GPa for Co2RhO4 and CoRh2O4. The rates of change of T
N with pressure (i.e., the pressure coefficients), 1.93 and 1.61 K GPa−1, respectively, were comparable to those for CoAl2O4 and Co3O4, respectively. The pressure coefficients of magnetic ordering temperature for these A-site spinel compounds were considerably larger than those for other spinel and iron-garnet compounds which follow the empirical ‘10/3 law’. Simple analysis of the chemical and physical pressure coefficients of T
N revealed that T
N depended on both the lattice volume and the oxygen positional parameter u.
Tunable plasmon resonances of Ag nanoparticles obtained by photoelectric modification under room temperature
Authors: Wang Hongyan , Dong Xiaoyan , Li Caiqiong , Xiang Kangning , Wang Hongbo , Zhu Pengcheng , Zhang Haina , Dai Han , Zhao Junfeng
Published: May 2020

Stretched Ag nanoparticles (AgNPs) have been obtained by photoelectric modification with room temperature. Significant elongation occurs on partial AgNPs with diameters ranging from 50 to 120 nm. For AgNPs with diameters larger than 120 nm, protuberances with sizes about 10 nm have been observed after photoelectric modification. Simulations based on finite difference time domain method have been used to reveal the process of the photoelectric modification. Such morphology changes of AgNPs can be attributed to the plasmonic phase transition and electric induced migration of Ag atoms at AgNPs surfaces. Due to the stretching of AgNPs, tunable plasmon resonances in visible spectrum have been obtained. This work could provide a new technology for the metallic nanostructure modification under low temperature.
Electrochemical properties of biogenic silver nanoparticles synthesized using Hagenia abyssinica (Brace) JF. Gmel. medicinal plant leaf extract
Authors: Murthy H C Ananda , Desalegn Zeleke Tegene , Ravikumar C R , Anil Kumar M R , Nagaswarupa H P
Published: May 2020

The biogenic/green silver nanoparticles (g-Ag NPs) were synthesised by using the extract of indigenous medicinal plant of Ethiopia,Hagenia abyssinica (Brace) JF. Gmel.leaf extract for the first time, to investigate the synergistic effect of biomolecules towards the enhancement of electrochemical properties of NPs. The synthesized g-Ag NPs were characterized by UV-visible, UV-DRS, FT-IR, XRD, SEM, EDXA, TEM, HRTEM and SAED techniques. The maximum absorbance,λmaxwas found to be 461 nm for g-Ag NPs due to surface plasmon resonance. The energy gap, Egof NPs, was found to be 2.31 eV. FTIR spectrum confirmed the presence of bioactive compounds responsible for possible capping and stabilisation of g-Ag NPs. The XRD analysis revealed that the g-Ag NPs are highly crystalline exhibiting sharp peaks for (111), (200), (220) and (311) planes in the diffraction pattern. SEM and TEM micrographs showed differently shaped Ag particles in addition to spherical shape. The average particle size of NPs was found to be 24.08 nm using imageJ analysis. EDX analysis confirmed the presence of Ag in the g-Ag NPs. In addition, the SAED pattern of g-Ag NPs presented concentric patterns for 4 major planes of crystalline silver. The d-spacing values of 0.2428 nm, 0.2126 nm, 0.1483 nm and 0.1263 nm corresponds to d111Ag, d200Ag, d220Ag and d311Ag lattice fringes respectively. The cyclic voltammetry (CV) results suggest that g-Ag NPs possess better electrochemical properties due to its lower charge transfer resistance value of 17 Ω. EIS studies too revealed better stability of g-Ag NPs as electrode materials.
MeV irradiation of tungsten nanowires: structural modifications
Authors: Grossi Joás , Kohanoff Jorge , Bringa Eduardo M
Published: May 2020

In this work we use the Two Temperature Model coupled to Molecular Dynamics (TTM-MD) to study swift heavy ion irradiation of W finite nanowires. Au projectiles are considered with energies ranging from 20 to 50 MeV, which correspond to electronic stopping values less than 20 keV nm−1 in the regime where electronic stopping is larger than nuclear stopping. Nanowires with diameters much smaller than the electron mean free path are considered for two different sizes with an aspect ratio ∼3.7 between length and diameter. Nanowires display radiation-induced surface roughening, sputtering yields and the formation of point defects and di-vacancies. For the smallest size, a hole stays opened in the central part of the wire for S

e
> 12.6 keV nm−1. W nanofoams, considered as collections of connected nanowires like those simulated here, are expected to behave similarly under irradiation displaying radiation resistance for the electronic stopping range that has been considered. In fact, nanowires larger than tens of nm would be needed for defect accumulation and lack of radiation resistance.
Stereo3D: using stereo images to enrich 3D visualization
Authors: Liu Yang , Singh Vinod Kumar , Zheng Deyou
Published: May 2020

Visualization in 3D space is a standard but critical process for examining the complex structure of high-dimensional data. Stereoscopic imaging technology can be adopted to enhance 3D representation of many complex data, especially those consisting of points and lines. We illustrate the simple steps that are involved and strongly recommend others to implement it in designing visualization software. To facilitate its application, we created a new software that can convert a regular 3D scatterplot or network figure to a pair of stereo images.

Availability and implementation

Stereo3D is freely available as an open source R package released under an MIT license at https://github.com/bioinfoDZ/Stereo3D. Others can integrate the codes and implement the method in academic software.

Contact

deyou.zheng@einsteinmed.org

Supplementary information

Supplementary data are available at Bioinformatics online.
Phylogeography of the ‘cosmopolitan’ orb-weaverArgiope trifasciata(Araneae: Araneidae)
Authors: Abel Christoph , Schneider Jutta M , Kuntner Matjaž , Harms Danilo
Published: May 2020

Few spider species show truly cosmopolitan distributions. Among them is the banded garden spider Argiope trifasciata, which is reported from six continents across major climatic gradients and geographical boundaries. In orb-weaver spiders, such global distributions might be a result of lively dispersal via ballooning. However, wide distributions might also be artefactual, owing to our limited understanding of species taxonomy. To test the hypothesis that A. trifasciata might be a complex of cryptic species with more limited geographical ranges, we investigated the biogeographical structure and evolutionary history of A. trifasciata through a combination of time-calibrated phylogenetic analyses (57 terminals and three genes), ancestral range reconstruction and species delimitation methods. Our results strongly suggest that A. trifasciata as currently defined is not a single species. Its populations fall into five reciprocally monophyletic clades that are genetically distinct and have evolutionary origins in the Plio-Pleistocene. These clades are confined to East Asia, temperate Australia, Hawaii, the New World and the Old World (Africa and most of the Palaearctic). Our results provide the basis for future investigation of morphological and/or ecological disparity between the populations that are likely to represent species, in addition to examinations of the attributes and dispersal modes of these species.
Mitochondrial DNA barcodes provide insight into the phylogeography and subspecies controversy in the widespread Neotropical white peacock butterfly,Anartia jatrophae(Nymphalidae: Nymphalinae)
Authors: Pfeiler Edward , Nazario-Yepiz Nestor O , Hernández-Cervantes Pablo Luis , Markow Therese Ann
Published: May 2020

The validity of subspecies designations in the common and wide-ranging Neotropical white peacock butterfly, Anartia jatrophae, has been debated for decades and remains an unsettled and contentious taxonomic issue among lepidopterists. Originally described by Linnaeus in the mid-18th century from specimens obtained from northern South America (Suriname), subsequent authors proposed a variety of subspecies names based on differences in adult external morphology among geographical populations. Many of these differences, however, were subsequently found to occur seasonally within populations, leading some to conclude that only a single polymorphic species should be recognized. Here, we have analysed both new and publicly available mitochondrial DNA barcodes, obtained from specimens collected from southern USA to northern Argentina, to assess whether they could provide insight into this long-standing controversy. Our molecular analyses, using a combination of character-based (nucleotide composition), population genetic and phylogenetic approaches, indicated the presence of at least four distinct genetic lineages that we suggest are distinct at the subspecies level, namely A. j. jatrophae, A. j. luteipicta, A. j. saturata and A. j. semifusca. Justification for these assignments and the proposed geographical distribution of each subspecies within the Americas are discussed.