scholarly journals Singular Structural Features on Humic Fractions in Solution: Statistical Analysis of Diverse Analytical Techniques Spectra

2010 ◽  
Vol 74 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Roberto Baigorri ◽  
Marta Fuentes ◽  
Francisco J. González-Vila ◽  
José M. García-Mina
Keyword(s):  
Statistical Analysis ◽  
Analytical Techniques ◽  
Structural Features ◽  
Humic Fractions

scholarly journals Chitosan hydrogel/silk fibroin/Mg(OH)2 nanobiocomposite as a novel scaffold with antimicrobial activity and improved mechanical properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Reza Eivazzadeh-Keihan ◽  
Fateme Radinekiyan ◽  
Hooman Aghamirza Moghim Aliabadi ◽  
Sima Sukhtezari ◽  
Behnam Tahmasebi ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Cell Viability ◽  
Silk Fibroin ◽  
Analytical Techniques ◽  
Structural Features ◽  
Mechanical Tests ◽  
Chitosan Hydrogel ◽  
Biological Capacity ◽  
Ft Ir ◽  
Novel Scaffold

AbstractHerein, a novel nanobiocomposite scaffold based on modifying synthesized cross-linked terephthaloyl thiourea-chitosan hydrogel (CTT-CS hydrogel) substrate using the extracted silk fibroin (SF) biopolymer and prepared Mg(OH)2 nanoparticles was designed and synthesized. The biological capacity of this nanobiocomposite scaffold was evaluated by cell viability method, red blood cells hemolytic and anti-biofilm assays. According to the obtained results from 3 and 7 days, the cell viability of CTT-CS/SF/Mg(OH)2 nanobiocomposite scaffold was accompanied by a considerable increment from 62.5 to 89.6% respectively. Furthermore, its low hemolytic effect (4.5%), and as well, the high anti-biofilm activity and prevention of the P. aeruginosa biofilm formation confirmed its promising hemocompatibility and antibacterial activity. Apart from the cell viability, blood biocompatibility, and antibacterial activity of CTT-CS/SF/Mg(OH)2 nanobiocomposite scaffold, its structural features were characterized using spectral and analytical techniques (FT-IR, EDX, FE-SEM and TG). As well as, given the mechanical tests, it was indicated that the addition of SF and Mg(OH)2 nanoparticles to the CTT-CS hydrogel could improve its compressive strength from 65.42 to 649.56 kPa.

THE STUDY NOISE OF THE PULSE ENERGY OF THE IBR-2M REACTOR

2019 ◽  
pp. 48-54
Author(s):  
A.M. Abackumov ◽  
L.A. Tayibov ◽  
T. Tsogsaihan
Keyword(s):  
Statistical Analysis ◽  
Standard Deviation ◽  
Pulse Energy ◽  
Structural Features ◽  
The Creation

This work is devoted to investigation of fluctuations of pulse energy of the IBR-2M reactor by the method of statistical analysis. There is a description of structural features of the IBR-2M reactor in this work and its main parameters are given. The principle of the creation of neutron pulses is shown. The work also contains a description of the method of statistical analysis and further calculations made by this method. Having the received data, a comparison of the estimates of the standard deviation with the available results for 2012 was made.

scholarly journals Plasma-Assisted Chemical Vapor Deposition of F-Doped MnO2 Nanostructures on Single Crystal Substrates

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1335
Author(s):  
Lorenzo Bigiani ◽  
Chiara Maccato ◽  
Alberto Gasparotto ◽  
Cinzia Sada ◽  
Elza Bontempi ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Data Storage ◽  
Vapor Deposition ◽  
Oxygen Deficiency ◽  
Chemical Vapor ◽  
Magnetic Ordering ◽  
Analytical Techniques ◽  
Structural Features ◽  
Optical Absorption Spectroscopy ◽  
Magnetic Characteristics

MnO2 nanostructures were fabricated by plasma assisted-chemical vapor deposition (PA-CVD) using a fluorinated diketonate diamine manganese complex, acting as single-source precursor for both Mn and F. The syntheses were performed from Ar/O2 plasmas on MgAl2O4(100), YAlO3(010), and Y3Al5O12(100) single crystals at a growth temperature of 300 °C, in order to investigate the substrate influence on material chemico-physical properties. A detailed characterization through complementary analytical techniques highlighted the formation of highly pure and oriented F-doped systems, comprising the sole β-MnO2 polymorph and exhibiting an inherent oxygen deficiency. Optical absorption spectroscopy revealed the presence of an appreciable Vis-light harvesting, of interest in view of possible photocatalytic applications in pollutant degradation and hydrogen production. The used substrates directly affected the system structural features, as well as the resulting magnetic characteristics. In particular, magnetic force microscopy (MFM) measurements, sensitive to the out-of-plane magnetization component, highlighted the formation of spin domains and long-range magnetic ordering in the developed materials, with features dependent on the system morphology. These results open the door to future engineering of the present nanostructures as possible magnetic media for integration in data storage devices.

Inorganic-Organic Hybrid Hierarchically Structured Methyl-modified Silica Monoliths

2004 ◽  
Vol 847 ◽  
Author(s):  
Doris Brandhuber ◽  
Nicola Hüsing ◽  
Herwig Peterlik
Keyword(s):  
Liquid Crystalline ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Structural Features ◽  
Water Soluble ◽  
X Ray ◽  
Silica Monoliths ◽  
Organic Hybrid ◽  
X Ray Scattering ◽  
Highly Porous

ABSTRACTHighly porous inorganic-organic hybrid monoliths with mesopores in a macroporous network have been prepared from methyltris(2-hydroxyethoxy)silane (MeGMS) and tetrakis(2-hydroxyethoxy)silane (EGMS) in the presence of an amphiphilic block copolymer. The amount of methyltris(2-hydroxyethoxy)silane (MeGMS) in the gel has been varied from 0 to 100 %. These glycol-modified silanes have the advantage of being water-soluble and thus allowing for a direct templating of liquid-crystalline surfactant mesophases without the presence of a homogenizing organic solvent such as ethanol. The wet gels have been dried by supercritical extraction with carbon dioxide.In the present work, the sol-gel behaviour of these glycol-modified silanes is discussed especially with a focus on the formation of the meso- and macrostructure. In addition, the influences of the varying ratios of methyltris(2-hydroxyethoxy)silane on the structural features of the gels are investigated by various analytical techniques such as small angle X-ray scattering, nitrogen sorption, and scanning electron microscopy.

scholarly journals The Effect of Placement and Career Development on Employee Performance of PT. Mandiri Karya in Jakarta

2020 ◽  
Vol 10 (1) ◽  
pp. 183
Author(s):  
Ade Muslimat
Keyword(s):  
Statistical Analysis ◽  
Career Development ◽  
Hypothesis Testing ◽  
Employee Performance ◽  
Hypothesis Test ◽  
Analytical Techniques ◽  
Regression Testing ◽  
Career Placement

This study aims to determine the effect of career placement and development on employee performance at PT. Mandiri Karya in Jakarta. The method used is explanatory research with analytical techniques using statistical analysis with regression testing, correlation, determination and hypothesis testing. The results of this study the placement of a significant effect on employee performance by 41.6%, the hypothesis test obtained t count> t table or (8,133> 1,986). Career development has a significant effect on employee performance by 43.8%, the hypothesis test is obtained t count> t table or (8.508> 1.986). Career placement and development simultaneously have a significant effect on employee performance by 52.6%, the hypothesis test is obtained F count> F table or (51.106> 2,700).

Geospatial clustering of childhood IgA vasculitis and IgA vasculitis-associated nephritis

2020 ◽  
pp. annrheumdis-2020-218649
Author(s):  
Matej Sapina ◽  
Marijan Frkovic ◽  
Mario Sestan ◽  
Sasa Srsen ◽  
Aleksandar Ovuka ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Spatial Variability ◽  
Spatial Autocorrelation ◽  
Census Data ◽  
Analytical Techniques ◽  
Danube River ◽  
University Hospital ◽  
Iga Vasculitis ◽  
Spatial Statistical Analysis ◽  
Continental Part

ObjectivesResearch on spatial variability of the incidence of IgA vasculitis (IgAV) in children and its potential implications for elucidation of the multifactorial aetiology and pathogenesis is limited. We intended to observe spatial variability of the incidence of IgAV and IgA vasculitis-associated nephritis (IgAVN) using modern geostatistical methods, and hypothesised that their spatial distribution may be spatially clustered.MethodsPatients' data were retrospectively collected from 2009 to 2019 in five Croatian University Hospital Centres for paediatric rheumatology, and census data were used to calculate the incidence of IgAV. Using spatial empirical Bayesian smoothing, local Morans’ I and local indicator of spatial autocorrelation (LISA), we performed spatial statistical analysis.Results596 children diagnosed with IgAV were included in this study, of which 313 (52.52%) were male. The average annual incidence proportion was estimated to be 6.79 per 100 000 children, and the prevalence of IgAVN was 19.6%. Existence of spatial autocorrelation was observed in both IgAV and IgAVN; however, clustering distribution differed. While IgAV showed clustering in Mediterranean and west continental part around cities, IgAVN was clustered in the northern Mediterranean and eastern continental part, where a linear cluster following the Drava and Danube river was observed.ConclusionIgAV incidence in Croatia is similar to other European countries. Spatial statistical analysis showed a non-random distribution of IgAV and IgAVN. Although aetiological associations cannot be inferred, spatial analytical techniques may help in investigating and generating new hypotheses in non-communicable diseases considering possible environmental risk factors and identification of potential genetic or epigenetic diversity.

Recovery, Recording, and Publication

2019 ◽  
pp. 36-64
Author(s):  
D. W. Harding
Keyword(s):  
Radiocarbon Dating ◽  
Analytical Techniques ◽  
Structural Features ◽  
Environmental Archaeology ◽  
Late Development ◽  
World War ◽  
The First World War ◽  
Archaeological Reconstruction ◽  
Second World ◽  
First World

Was Pitt-Rivers really the ‘father of field archaeology’? He certainly contributed to artefact seriation and was aware of the importance of everyday artefacts for archaeological reconstruction, but, though meticulous in recording artefacts, he was not noted for recognizing structural features and he did not excavate stratigraphically. Field survey had a long history in Britain before the establishment of the Royal Commissions at the beginning of the twentieth century, with air photography subsequently developing out of military survey in the First World War. The importance of stratigraphy, association, and context was promoted by Sir Mortimer Wheeler from the 1930s, but scientific techniques were not widely applied until after the Second World War, with the advent of radiocarbon dating, geophysical survey, and a developing range of analytical techniques. Environmental archaeology as an integral part of the discipline was a relatively late development, as were osteological studies, notwithstanding the interest in craniology since Victorian times. ‘Rescue’ archaeology and development-funded archaeology has not only transformed the scale and quantity of finds, but has transformed qualitatively understanding of settlement patterns and distributions.

scholarly journals Analysis of uncertainty in the surgical department: durations, requests and cancellations

2019 ◽  
Vol 43 (6) ◽  
pp. 706 ◽  
Author(s):  
Belinda Spratt ◽  
Erhan Kozan ◽  
Michael Sinnott
Keyword(s):  
Statistical Analysis ◽  
Total Duration ◽  
Analytical Techniques ◽  
Planning And Scheduling ◽  
Surgical Department ◽  
Modelling Uncertainty ◽  
Rate Dependent ◽  
Planning Staff ◽  
Log Normal ◽  
Surgical Duration

Objective Analytical techniques are being implemented with increasing frequency to improve the management of surgical departments and to ensure that decisions are well informed. Often these analytical techniques rely on the validity of underlying statistical assumptions, including those around choice of distribution when modelling uncertainty. The aim of the present study was to determine a set of suitable statistical distributions and provide recommendations to assist hospital planning staff, based on three full years of historical data. Methods Statistical analysis was performed to determine the most appropriate distributions and models in a variety of surgical contexts. Data from 2013 to 2015 were collected from the surgical department at a large Australian public hospital. Results A log-normal distribution approximation of the total duration of surgeries in an operating room is appropriate when considering probability of overtime. Surgical requests can be modelled as a Poisson process with rate dependent on urgency and day of the week. Individual cancellations could be modelled as Bernoulli trials, with the probability of patient-, staff- and resource-based cancellations provided herein. Conclusions The analysis presented herein can be used to ensure that assumptions surrounding planning and scheduling in the surgical department are valid. Understanding the stochasticity in the surgical department may result in the implementation of more realistic decision models. What is known about the topic? Many surgical departments rely on crude estimates and general intuition to predict surgical duration, surgical requests (both elective and non-elective) and cancellations. What does this paper add? This paper describes how statistical analysis can be performed to validate common assumptions surrounding surgical uncertainty. The paper also provides a set of recommended distributions and associated parameters that can be used to model uncertainty in a large public hospital’s surgical department. What are the implications for practitioners? The insights on surgical uncertainty provided here will prove valuable for administrative staff who want to incorporate uncertainty in their surgical planning and scheduling decisions.

scholarly journals UPAYA MENINGKATKAN MINAT BELAJAR DAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIS MELALUI MODEL QUICK ON THE DRAW

2021 ◽  
Vol 1 (2) ◽  
pp. 170-177
Author(s):  
MONICA KHOIRUNNISA
Keyword(s):  
Statistical Analysis ◽  
Problem Solving ◽  
Everyday Life ◽  
Mathematical Problem ◽  
Analytical Techniques ◽  
Mathematical Problem Solving ◽  
Average Percentage ◽  
Student Activity ◽  
Learning Interest ◽  
Descriptive Statistical Analysis

This research is a Classroom Action Research with two analytical techniques, namely qualitative analysis and descriptive statistical analysis to analyze students' interest in learning and mathematical problem solving abilities. Interest in learning is an individual's interest in a process that produces changes in behavior, meanwhile, mathematical problem solving ability is the ability to be able to solve questions or problems in everyday life. The quick on the draw model is a learning to master material concepts that can increase students' enthusiasm and enthusiasm in learning because of teamwork and speed through question cards and question sets. Based on the results of research and discussion, it is known that the quick on the draw model can increase learning interest and mathematical problem solving ability with two cycles. The results of the average percentage of teacher activity observation sheets increased by 16.18% which in the first cycle was 75.98% to 92.16% in the second cycle. Then, the results of the average percentage of student activity observation sheets increased by 19.12% from 72.55% in the first cycle to 91.67% in the second cycle. In addition, the problem solving ability also increased by 26.54% from 40.88% in the first cycle to 67.42% in the second cycle. ABSTRAKPenelitian ini merupakan Penelitian Tindakan Kelas dengan dua teknik analisis, yaitu analisis kualitatif dan analisis statistik deskriptif untuk menganalisis minat belajar dan kemampuan pemecahan masalah matematis siswa. Minat belajar merupakan ketertarikan individu dalam suatu proses yang menghasilkan perubahan tingkah laku, sedangkan, kemampuan pemecahan masalah matematis adalah kemampuan untuk dapat menyelesaikan pertanyaan-pertanyaan atau masalah dalam kehidupan sehari-hari. Model quick on the draw merupakan suatu pembelajaran untuk menguasai konsep-konsep materi yang dapat meningkatkan antusiasme dan semangat siswa dalam belajar karena adanya suatu kerja tim dan kecepatan melalui adanya kartu soal dan set pertanyaan. Berdasarkan hasil penelitian dan pembahasan, diketahui jika model quick on the draw dapat meningkatkan minat belajar dan kemampuan pemecahan masalah matematis dengan dua siklus. Hasil rata – rata prosentase lembar observasi aktivitas guru meningkat sebesar  yang pada siklus I sebesar  menjadi  di siklus II. Kemudian, hasil rata – rata prosentase lembar observasi aktivitas siswa mengalami peningkatan sebesar  yang awalnya  di siklus I menjadi di siklus II. Selain itu, kemampuan pemecahan masalahnya juga meningkat  dari  di siklus I menjadi  di siklus II.

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