Articoli di riviste: "Heck (Firm)"

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Wang, Mingyu, Jie Liu, Jinpeng Li e Tiesheng Li. "A New Chiral Cyclopalladated Ferrocenylimine Self-assembly Polymeric Film supported on Silicon for Heck and Suzuki-coupling Reactions". Catalysis Research 2, n. 2 (21 marzo 2022): 1. http://dx.doi.org/10.21926/cr.2202010.

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A new chiral cyclopalladated ferrocenyl imine catalyst (called 4a2) was designed and synthesized, and its self-assembly catalytic polymeric brush supported on silicon (denoted as Si@PB4a2) was also fabricated by surface-initiated atom transfer radical polymerization (ATRP) and characterized. The catalytic properties of monomer 4a2 in homogeneous and Si@PB4a2 in heterogeneous in Heck and Suzuki cross-coupling were investigated, respectively. They exhibited higher catalytic activity in Heck, and Suzuki coupling reactions in homogeneous and heterogeneous using water as the solvent, and the catalytic activity of Si@PB4a2 with a turn of number (TON,11933 molproduct/molcat) in heterogeneous was 200 times more than that of 4a2 in homogeneous due to the ordered arrangement of the catalyst supported on silicon. Si@PB4a2 had high recyclability, i.e., at least eight runs and six runs, in Suzuki and Heck coupling reactions, respectively.

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Peng, Yu Lien, Ru Lang Hsu, Dong Po Wang e I. Min Jiang. "Photoreflectance of AlGaN/GaN Heterostructure Measured by Using Mercury Lamp as Pump Beam". Materials Science Forum 663-665 (novembre 2010): 365–68. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.365.

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Photoreflectance (PR) spectra of a GaN thin film and an AlGaN/GaN heterostructure were measured by using a HeCd laser or a mercury lamp as a pump beam. The wavelengths (λ) of the HeCd laser and the mercury lamp are 325 nm and 253.7 nm, respectively. The energy of the HeCd laser is lower than band-gap energy of AlxGa1-xN (x > 0.2), so electron-hole pairs cannot be generated in the AlGaN layer. Hence, the PR of the AlGaN was measured by using Argon ion laser (λ =300 nm) or quadrupled Nd:YAG (λ =266 nm) rather than HeCd laser in the previous works. In this work, the mercury lamp was used as the pump beam. Although the mercury lamp is a diffused source, it is not a hindrance to the PR measurements. The signal to noise ratio is improved by using defocused pump and probe beams in the PR measurement.

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Von Eije, J. H. (Henk), Matthijs Suurmeijer e Peter Smid. "Research and Development and Firm Risk". Journal of Corporate Finance Research / Корпоративные Финансы | ISSN: 2073-0438 9, n. 3 (7 ottobre 2015): 7–26. http://dx.doi.org/10.17323/j.jcfr.2073-0438.9.3.2015.7-26.

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J. H. (Henk) von Eije - University of Groningen, Faculty of Economics and Business. E-mail: j.h.von.eije@rug.nl Matthijs Suurmeijer - University of Groningen, Faculty of Economics and Business. Email: matthijs.suurmeijer@gmail.com Peter Smid - Dr, University of Groningen, Faculty of Economics and Business. E-mail: p.p.m.smid@eco.rug.nl Spending on R&D has grown faster than other investments. This may result in higher return and higher risk. We focus on the latter and examine how research and development (R&D) affects the risks of US firms. We analyze the impact on the firm’s beta, its systematic and idiosyncratic risk, and the combination of the latter two (total risk). Because investors prefer upside to downside risk, we also analyze whether downside risk is also influenced by R&D. We use panel and quantile regressions and control for dividend payouts, growth, leverage, asset liquidity, firm size, earnings variability, firm age and industry competition. We then show that the impact is positive and highly significant for beta, systematic risk and total risk. The impact on systematic risk contrasts to the finding by McAlister et al. (2007) who find that R&D insulates firms from market downturns and thereby lowers systematic risk. The increases in risks are, moreover, stronger at higher relative levels of R&D spending. Unfortunately for investors, downside risk is also increasing with relative R&D spending. The results may make it also more difficult for managers to defend R&D investments. R&D may indeed generate future returns, but also adds to the next year’s risk. The impact on systematic risk contrasts to the finding by McAlister et al. [2007] that R&D insulates firms from market downturns and thereby lowers systematic risk. While the magnitudes of the effects are small, the impact is relevant when compared with other accounting variables included in the model, especially for beta and systematic risk. Apart from this, there are strong indications that the hypothesized relationis non-linear.

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Li, Zhenliang, Zunli Mo, Ruibin Guo, Shujuan Meng, Ruijuan Wang, Huhu Gao e Xiaohui Niu. "Electrochemical enantiorecognition of tryptophan enantiomers based on a multi-walled carbon nanotube–hydroxyethyl chitosan composite film". Analytical Methods 9, n. 35 (2017): 5149–55. http://dx.doi.org/10.1039/c7ay01775h.

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A novel chiral electrochemical sensor based on hydroxyethyl chitosan (HECS) covalently binding with the carboxylic multi-walled carbon nanotubes (MWCNT–COOH) was fabricated for discrimination of tryptophan (Trp) enantiomers.

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Monopoli, Antonio, Michele Casiello, Pietro Cotugno, Antonella Milella, Fabio Palumbo, Francesco Fracassi e Angelo Nacci. "Synthesis of Tailored Perfluoro Unsaturated Monomers for Potential Applications in Proton Exchange Membrane Preparation". Molecules 26, n. 18 (15 settembre 2021): 5592. http://dx.doi.org/10.3390/molecules26185592.

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The aim of the present work is the synthesis and characterization of new perfluorinated monomers bearing, similarly to Nafion®, acidic groups for proton transport for potential and future applications in proton exchange membrane (PEM) fuel cells. To this end, we focused our attention on the synthesis of various molecules with (i) sufficient volatility to be used in vacuum polymerization techniques (e.g., PECVD)), (ii) sulfonic, phosphonic, or carboxylic acid functionalities for proton transport capacity of the resulting membrane, (iii) both aliphatic and aromatic perfluorinated tags to diversify the membrane polarity with respect to Nafion®, and (iv) a double bond to facilitate the polymerization under vacuum giving a preferential way for the chain growth of the polymer. A retrosynthetic approach persuaded us to attempt three main synthetic strategies: (a) organometallic Heck-type cross-coupling, (b) nucleophilic displacement, and (c) Wittig–Horner reaction (carbanion approach). Preliminary results on the plasma deposition of a polymeric film are also presented. The variation of plasma conditions allowed us to point out that the film prepared in the mildest settings (20 W) shows the maximum monomer retention in its structure. In this condition, plasma polymerization likely occurs mainly by rupture of the π bond in the monomer molecule.

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Sacks, Daniel W., Khoa Vu, Tsan‐Yao Huang e Pinar Karaca‐Mandic. "How do insurance firms respond to financial risk sharing regulations? Evidence from the Affordable Care Act". Health Economics 30, n. 6 (aprile 2021): 1443–60. http://dx.doi.org/10.1002/hec.4252.

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Markowitz, Sara. "WHERE THERE'S SMOKING, THERE'S FIRE: THE EFFECTS OF SMOKING POLICIES ON THE INCIDENCE OF FIRES IN THE USA". Health Economics 23, n. 11 (23 agosto 2013): 1353–73. http://dx.doi.org/10.1002/hec.2990.

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Wilmoth, Daniel R. "Reconciling Estimates of the Value to Firms of Reduced Regulatory Delay in the Marketing of Their New Drugs". Health Economics 24, n. 12 (8 marzo 2015): 1651–56. http://dx.doi.org/10.1002/hec.3166.

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McDonald, Rory, e Matt Higgins. "Henk Volberda, Frans van den Bosch, and Kevin Heij: Reinventing Business Models: How Firms Cope with Disruption". Administrative Science Quarterly 65, n. 2 (16 marzo 2020): NP13—NP15. http://dx.doi.org/10.1177/0001839220910621.

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Lee, Hyun-Yong, Jong-Ki Kim e Hong-Bay Chung. "On Ag-doping in amorphous Sb2S3 thin film by HeNe and HeCd laser exposures and its optical characteristics". Journal of Non-Crystalline Solids 279, n. 2-3 (febbraio 2001): 209–14. http://dx.doi.org/10.1016/s0022-3093(00)00415-4.

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Zhao, Youfu, Sara E. Blumer e George W. Sundin. "Identification of Erwinia amylovora Genes Induced during Infection of Immature Pear Tissue". Journal of Bacteriology 187, n. 23 (1 dicembre 2005): 8088–103. http://dx.doi.org/10.1128/jb.187.23.8088-8103.2005.

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ABSTRACT The enterobacterium Erwinia amylovora is a devastating plant pathogen causing necrotrophic fire blight disease of apple, pear, and other rosaceous plants. In this study, we used a modified in vivo expression technology system to identify E. amylovora genes that are activated during infection of immature pear tissue, a process that requires the major pathogenicity factors of this organism. We identified 394 unique pear fruit-induced (pfi) genes on the basis of sequence similarity to known genes and separated them into nine putative function groups including host-microbe interactions (3.8%), stress response (5.3%), regulation (11.9%), cell surface (8.9%), transport (13.5%), mobile elements (1.0%), metabolism (20.3%), nutrient acquisition and synthesis (15.5%), and unknown or hypothetical proteins (19.8%). Known virulence genes, including hrp/hrc components of the type III secretion system, the major effector gene dspE, type II secretion, levansucrase (lsc), and regulators of levansucrase and amylovoran biosynthesis, were upregulated during pear tissue infection. Known virulence factors previously identified in E. (Pectobacterium) carotovora and Pseudomonas syringae were identified for the first time in E. amylovora and included HecA hemagglutinin family adhesion, Peh polygalacturonase, new effector HopPtoCEA, and membrane-bound lytic murein transglycosylase MltEEA. An insertional mutation within hopPtoC EA did not result in reduced virulence; however, an mltE EA knockout mutant was reduced in virulence and growth in immature pears. This study suggests that E. amylovora utilizes a variety of strategies during plant infection and to overcome the stressful and poor nutritional environment of its plant hosts.

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Liu, Meihong, Yiyang Wu, Yuchen Wu, Mingfu Gao, Zhenhua Lü, Sanchuan Yu e Congjie Gao. "Cross-flow deposited hydroxyethyl cellulose (HEC)/polypropylene (PP) thin-film composite membrane for aqueous and non-aqueous nanofiltration". Chemical Engineering Research and Design 153 (gennaio 2020): 572–81. http://dx.doi.org/10.1016/j.cherd.2019.11.003.

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Yang, Zhi Yuan, Hai Zhen Shi e Yan Jun Tang. "Changes in Layer Properties and Physical Properties of Papers from Old Corrugated Container Fibres with PDADMAC/HEC Polyelectrolyte Multilayers". Advanced Materials Research 496 (marzo 2012): 67–70. http://dx.doi.org/10.4028/www.scientific.net/amr.496.67.

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In this paper, Old Corrugated Container (OCC) was used as the raw material for making paper. The layer-by-layer (LBL) assembly process of creating highly structured thin films was adopted to modify the surface of OCC fibres. Poly dimethyldiallylammonium chloride (PDADMAC) and hydroxyethyl cellulose (HEC) have been used to build up polyelectrolyte multilayers on OCC fibres under a certain condition. Zeta potential analyzer was used to monitor the dynamic adsorption of PDADMAC and HEC with different amount on OCC fibers. Strength measurements of the sheets including tensile index and bursting index were also determined, showing a significant improvement in physical strength with the increase of adsorbed layer number. Compared with not being processed sheets, tensile index and bursting index of sheets from treated fibre with polyelectrolyte multilayers were raised by 36.65% and 49.50%, respectively. Furthermore, filtration time analysis of OCC fibre suspension showed that the built up of PDADMAC and HEC on OCC fibres could improve the fiber-fiber joint strength of joints from polymer-treated fibers, which made the filtration time decline from 30 s to 10.6 s. In addition, SEM was introduced to observe the morphology of the PDADMAC/HEC multilayers. The images revealed that the surface of OCC fibres structured a film like plastic, which could be ascribed to the adsorption layer of polyelectrolyte.

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Messali, Nassima, Mia Yabut, Pouneh Kermani, Shahin Rafii e Joseph M. Scandura. "Capturing Endothelial-to-Hematopoietic Transition Using a Highly Efficient in Vitro Platform". Blood 142, Supplement 1 (28 novembre 2023): 2670. http://dx.doi.org/10.1182/blood-2023-190072.

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Introduction De novo generation of hematopoietic stem and progenitor cells (HSPCs) for therapeutic use has been a long-standing goal of regenerative medicine. During development, the first definitive hematopoietic stem cells (HSCs) derive from a small number of specialized vascular endothelial cells (EC), named hemogenic endothelial cells (HECs), located in the Aorta-Gonado-Mesonephrose (AGM). The process of HEC conversion to HSPCs is known as endothelial-to-hematopoietic transition (EHT). During EHT, endothelial features are lost while switching on hematopoietic transcriptional programs leading to drastic functional and morphological changes that generate free-floating, round hematopoietic cells from large, flat, anchorage-dependent ECs. Key steps regulating EHT are difficult to elucidate using in vivo models because the hemogenic capacity of HECs occurs within a 2-day developmental window. Only a tiny number of cells undergo EHT in vivo. New model systems that overcome current in vivo obstacles are required so the details of EHT and the mechanisms that lead to the generation of HSPCs can be better understood. We previously reported that fully-committed ECs can be converted to functional HSPCs by ectopic expression of transcription factors Spi1, FOSB, GFI1, and Runx1 (SFGR) and an appropriate vascular niche (Sandler et al. Nature, 2014; Lis et al. Nature, 2017). But conversion using this method required several weeks and was associated with variable and low efficiency. Here, we show that our new in vitro EHT platform (ivEHT), very closely recapitulates the process of EHT in vivo and can be used to uncover heretofore unrecognized steps necessary for EC conversion to HSPCs. Methods All steps in the in vitro conversion of ECs to HSPCs were systematically analyzed and optimized. The refined model utilized new media constituents and polycistronic constructs to ensure ectopic expression of transcription factors Spi1, FOSB, GFI1 and Runx1 (SFGR)in human umbilical vein-ECs (HUVECs) in appropriate ratios and sequence. Results The new ivEHT platform yields efficient EC conversion to hematopoietic like CD45+ cells (≥80%) and high temporal reproducibility of conversion that is largely complete within 96 hrs. The ivEHT sequence of conversion closely follows the timing and sequence of EHT in vivo. Initially, transduced HUVECs are large, flat cells with CDH5-marked intercellular junctions and firm adhesion to basement membrane. Within the first 24hrs of induction, SFGR-HUVECs downregulate ECs markers CD31, KDR, CDH5 and activate the endogenous RUNX1 locus detected by the expression of nuclear GFP (GFPn) under control of the human RUNX1+24 enhancer (detected using a lentiviral reporter vector). Day 2 (D2) is characterized by complete clearance of endothelial-specific Weibel-Palade Bodies (WPBs, marked by Von Willebrand Factor, VWF) and excess mitochondria. This window also initiates morphologic changes in RUNX1-GFPn marked cells with loss of intercellular junctions and attachment to basement membrane and initial expression of hematopoietic markers such as CD45. Days 3-4 are marked by loss of cell volume and cytoplasm, cellular rounding and detachment from matrix, and increased expression of CD45 and other hematopoietic markers like cKIT, MPL, CD43. These stages of conversion are only identified in RUNX1-GFPn marked cells and by the end of D5, ~80% of cells have fully converted to CD45+ cells. Conversion is not accompanied by cell proliferation, but after D5 cell numbers expand rapidly. The ivEHT platform is scalable and highly reproducible making it amenable to higher-throughput testing in 96-well format using flow cytometry readouts. Using the ivEHT platform, we have captured and validated in AGM explants previously unobserved aspects of early EHT that is complete between D2-D3. Discussion This work promises a reproducible, faithful, and scalable platform which generates hematopoietic like cells while successfully recapitulating early steps of the EHT in the AGM. Importantly, this platform is readily accessible and is easily customized for discovery of EHT molecular details currently hidden to science, allowing significant advances in the understanding of how HSPCs emergence in vivo.

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Wang, Tianlin, Xingming Zhao, Huazhe Yang e Yang Qi. "On the roles of HEC in Pechini sol-gel method: Enhancement of stability, wettability of the sol and surface roughness of Bi2212 film". Ceramics International 44, n. 11 (agosto 2018): 12144–48. http://dx.doi.org/10.1016/j.ceramint.2018.03.258.

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Volberda, Henk W. "Comments on ‘Mastering strategic renewal: Mobilising renewal journeys in multi-unit firms’, Henk W. Volberda, Charles Baden-Fuller, Frans A.J. van den Bosch. Long Range Planning, Volume 34, Issue 2, April 2001, Pages 159–178". Long Range Planning 50, n. 1 (febbraio 2017): 44–47. http://dx.doi.org/10.1016/j.lrp.2016.12.002.

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Jahava, Marlina, Mohd Hafiz Jali, Danusha Pillai, Haziezol Helmi Mohd Yusof, Md Ashadi Md Johari, Aminah Ahmad, Siti Halma Johari, Sulaiman Wadi Harun e Siddharth Thokchom. "Seventh Sense Research Group Home Journals For Authors For Editors For Reviewers Call for Paper May 2023 IJEEE Aim & Scope Editorial Board Paper Submission Current Issue Archives Publication Ethics Guidelines for Authors Guidelines for Editors Guidelines for Reviewer Indexing Article Processing charges Mode of Payment for APC Paper Template Copyright Form Alcohol Sensing Device using Glass Substrates Coated with Agarose Gel and HEC/PVDF Nanomaterial International Journal of Electrical and Electronics Engineering © 2023 by SSRG - IJEEE Journal Volume 10 Issue 4 Year of Publication : 2023 Authors : Marlina Jahava, Mohd Hafiz Jali, Danusha Pillai, Haziezol Helmi Mohd Yusof, Md. Ashadi Md Johari, Aminah Ahmad, Siti Halma Johari, Sulaiman Wadi Harun, Siddharth Thokchom 10.14445/23488379/IJEEE-V10I4P104 pdf How to Cite? Marlina Jahava, Mohd Hafiz Jali, Danusha Pillai, Haziezol Helmi Mohd Yusof, Md. Ashadi Md Johari, Aminah Ahmad, Siti Halma Johari, Sulaiman Wadi Harun, Siddharth Thokchom, "Alcohol Sensing Device using Glass Substrates Coated with Agarose Gel and HEC/PVDF Nanomaterial," SSRG International Journal of Electrical and Electronics Engineering, vol. 10, no. 4, pp. 37-45, 2023. Crossref, https://doi.org/10.14445/23488379/IJEEE-V10I4P104 Abstract: This paper reported the development of an alcohol sensor based on a glass substrate platform. The glass substrate was coated with two nanomaterial types: Hydroxyethylcellulose/Polyvinylidene fluoride (HEC/PVDF) and Agarose Gel, for comparison purposes. Three layers of coating material have been applied to the glass substrate to obtain the optimum sensing response. The coated glass substrate is kept dry for 24 hours before expose to variations of ethanol concentration to investigate the sensing response. A significant response to alcohol concentrations has been observed for both samples due to the changeable refractive index layer of the coating material. The sensitivity improved by a factor of 1.18 and 1.51, respectively, compared to the bared glass. The proposed sensor employed low-cost and commercially available components such as a glass substrate, LED light source and Arduino microcontroller to perform as an alcohol sensor. It prevents using expensive laser-based sensors, which is less practical in real industrial applications. Based on the experiment results, the HEC/PVDF-coated glass produced has demonstrated better results in terms of repeatability, hysteresis, stability and sensitivity as compared to agarose gel-coated glass. Hence the proposed sensor has a decent potential as an alcohol sensor Keywords: Alcohol sensor, Glass substrate, HEC/PVDF, Agarose gel. References: [1] G. 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[CrossRef] [Google Scholar] [Publisher Link] [37] Feng-Bo Yang et al., "A Low-Cost Light-Emitting Diode Induced Fluorescence Detector for Capillary Electrophoresis Based on an Orthogonal Optical Arrangement," Talanta, vol. 78, no. 3, pp. 1155-1158, 2009. [CrossRef] [Google Scholar] [Publisher Link] Quick Links Home Journals Call For Paper Authors Paper submission Preparation Guidelines Review Process Editors Reviewer Guidelines Join as Editor Special Issue Proposal Events Conferences Awards Special Issues SSRG Contact Us Indexing Follow Us Facebook Linkedin Twitter © SSRG International Journals - All right reserved Creative Commons License SSRG site and its metadata are licensed under CC BY-NC-ND Designed by VTS". International Journal of Electrical and Electronics Engineering 10, n. 4 (30 aprile 2023): 37–45. http://dx.doi.org/10.14445/23488379/ijeee-v10i4p104.

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Bakiev, A. N., O. A. Mayorova, A. A. Gorbunov, I. V. Lunegov, E. V. Shklyaeva e G. G. Abashev. "New chromophores based on combination of ethylenedioxythiophene and carbazole fragments: synthesis and optoelectronic properties". Organic Photonics and Photovoltaics 4, n. 1 (30 gennaio 2016). http://dx.doi.org/10.1515/oph-2016-0005.

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AbstractTwo new D-π-A chromophores composed of an electron-donating carbazole unit linked through π- bridges, bearing 3,4-ethylenedioxythiophene (EDOT) moiety, with an electron withdrawing dicyanovinyl group (DCV) were successfully synthesized involving Suzuki or Heck cross-coupling and Knöevenagel reactions as the key steps. The obtained compounds absorb light over a broad spectral range, including the visible spectrum. The HOMO/LUMO energies and band gap energy values (Eg) were calculated on the basis of the experimental optical and electrochemical data: HOMO, LUMO, Eg (eV), −5.51, −3.14, 2.37 (4), −5.34, −3.14, 2.20 (7). The presence of the HC=CH unit in compound 7 resulted in the increase of the HOMO energy level, the decrease of a band gap value and red shifts of the absorption and emission bands in comparison with those of 4. Large Stokes shifts and broadband luminescence inherent to both chromophores suggest their use as materials for luminescent solar collectors (LSCs). The obtained compounds demonstrated good solubility and suitable thin-film forming properties. For this reason, they may be suitable for solution-processable photovoltaic applications.

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Nasseh, Kamyar, John R. Bowblis e Coady Wing. "How do dental practices respond to changes in scope of practice regulations?" Health Economics, 17 luglio 2024. http://dx.doi.org/10.1002/hec.4878.

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AbstractRegulations that restrict the tasks that credentialed workers are allowed to perform may affect a firm's input choices, output, and which part of the market the firm serves. Using dental practice survey data from 1989 to 2014 and a stacked difference‐in‐differences design, this paper examines the effects of state‐level scope of practice regulations on the behavior of dental practices. Results suggest that scope of practice deregulation in regards to dental hygienists' ability to administer nitrous oxide or local anesthesia is associated with fewer dentist visits per week in the short‐term, lower patient wait times, and an increased likelihood of treating lower revenue generating publicly insured patients. There is weak evidence that scope of practice deregulation alters a practice's labor inputs.

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Murphy, Bernice M. "‘Wheels of Tragedy’: Death on the Highways in Carnival of Souls (1962) and the Highway Safety Film". FORUM: University of Edinburgh Postgraduate Journal of Culture & the Arts, n. 24 (28 maggio 2017). http://dx.doi.org/10.2218/forum.24.1876.

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This article argues that Carnival of Souls (1962), is a foundational text in the ‘Highway Horror’ sub- genre. It directly confronts one of the most pervasive taboos in modern American life: the horrific death toll associated with mass automobility. In Herk Harvey’s cult film, the protagonist is killed but finds herself unwilling to accept her fate. As in the many similar films that followed, the highway becomes a purgatorial space between life and death. The blindness of the protagonists is linked to society’s collective willingness to overlook (or tolerate) the devastating frequency of the fatal car crash. The article also discusses the highway safety films of the 1950s and 60s.

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Brickley, James A., Susan F. Lu e Gerard J. Wedig. "Are firms with ‘deep pockets’ more responsive to tort liability? Evidence from nursing homes". Health Economics, 23 maggio 2022. http://dx.doi.org/10.1002/hec.4528.

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22

Oliveira, Jean Maikon Santos, e Marcio Ricardo Salla. "MODELLING THE IMPACTS OF WILDFIRE ON SURFACE RUNOFF IN THE UPPER UBERABINHA RIVER WATERSHED USING HEC-HMS". Journal of Urban and Environmental Engineering, 21 maggio 2017, 88–98. http://dx.doi.org/10.4090/juee.2017.v11n1.088098.

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Fire significantly affects hydrological processes in the watershed because it changes land cover and it creates a double layer of hydrophobic soil covered with ash, increasing the surface runoff and the production of debris flow in the basin. Assessing the impacts of fire on overland flow requires the use of modeling softwares capable of simulating post-fire discharge. Because a total of 760 wildfires were detected in the Upper Uberabinha River subbasin in the last nine years, it is of dire importance to understand the consequential impacts of fire on hydrological processes in this basin. In this study, the HEC-HMS model was used to evaluate post-fire discharge in the Upper Uberabinha River watershed. Model was previously calibrated and validated using two representative storms observed in the wet season. After calibration, the 5-, 10-, 25-, 50-, 100-, and 200-year storms were simulated in scenarios with increasing burn severity. The calibrated model performed well in the prediction of discharge values at a daily basis (0% difference in peak timing; 0% difference in peak flow; 31.8% BIAS). Peak flow and discharge volume increased and peak timing shifted to the left as severity of burn increased. The highest increment in peak discharge was 74.7% for the 10-year storm, whereas overall discharge volume raised in up to 31.9% for the 50-year storm, both after simulation in the most fire-impacted scenario. The results reveal that fire highly affects hydrological characteristics, e.g. peak timing and flow and discharge volume, in the Upper Uberabinha River watershed. The authors suggest further investigations concerning the impacts of wildfire on other processes, such as the production of debris flow in the basin.

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23

Oliveira, Jean Maikon Santos, e Marcio Ricardo Salla. "MODELLING THE IMPACTS OF WILDFIRE ON SURFACE RUNOFF IN THE UPPER UBERABINHA RIVER WATERSHED USING HEC-HMS". Journal of Urban and Environmental Engineering, 21 maggio 2017, 88–98. http://dx.doi.org/10.4090/juee.2017.v11n1.88-98.

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Abstract (sommario):

Fire significantly affects hydrological processes in the watershed because it changes land cover and it creates a double layer of hydrophobic soil covered with ash, increasing the surface runoff and the production of debris flow in the basin. Assessing the impacts of fire on overland flow requires the use of modeling softwares capable of simulating post-fire discharge. Because a total of 760 wildfires were detected in the Upper Uberabinha River subbasin in the last nine years, it is of dire importance to understand the consequential impacts of fire on hydrological processes in this basin. In this study, the HEC-HMS model was used to evaluate post-fire discharge in the Upper Uberabinha River watershed. Model was previously calibrated and validated using two representative storms observed in the wet season. After calibration, the 5-, 10-, 25-, 50-, 100-, and 200-year storms were simulated in scenarios with increasing burn severity. The calibrated model performed well in the prediction of discharge values at a daily basis (0% difference in peak timing; 0% difference in peak flow; 31.8% BIAS). Peak flow and discharge volume increased and peak timing shifted to the left as severity of burn increased. The highest increment in peak discharge was 74.7% for the 10-year storm, whereas overall discharge volume raised in up to 31.9% for the 50-year storm, both after simulation in the most fire-impacted scenario. The results reveal that fire highly affects hydrological characteristics, e.g. peak timing and flow and discharge volume, in the Upper Uberabinha River watershed. The authors suggest further investigations concerning the impacts of wildfire on other processes, such as the production of debris flow in the basin.

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Cen, Congnan, Feifei Wang, Yifan Wang, Huan Li, Linglin Fu, Yan Li, Jian Chen e Yanbo Wang. "Design and characterization of an antibacterial film composited by hydroxyethyl cellulose (HEC), carboxymethyl chitosan (CMCS), and nano ZnO for food packaging". International Journal of Biological Macromolecules, gennaio 2023, 123203. http://dx.doi.org/10.1016/j.ijbiomac.2023.123203.

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25

Green, Joshua, e Adam Swift. "Scan". M/C Journal 8, n. 4 (1 agosto 2005). http://dx.doi.org/10.5204/mcj.2377.

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The scan is both the quick glance and the measured study, it is a survey of the exterior and an interrogation of hidden interiors. Practices of scanning are a response to the increased number of things to consider and the reduced amount of time to consider them. Scanning demarcates that which is seen as relevant, interesting and important into ever increasing ‘to do’ lists, at the same time dismissing that which is not. These questions of importance or relevance are often decided through cursory glances and greater consideration is regularly left for ‘later’. Scanning engages questions about surveillance, about the way in which we surveil our self and our surrounds, and about the way we submit our self and our surrounds to surveillance by others. In many ways scanning has an impact on the way in which authority is practiced, in creative practice, scholarship and daily life. Our feature article in this issue is by Lelia Green who discusses the way in which scanning radio frequencies, and particularly the shared environment created by the Royal Flying Doctor’s Service radio service, drew together a community of remote West Australians. “Scanning the Satellite Signal in Remote Western Australia” reflects upon the way scanning shared communication signals provided virtual connections at times lost by the introduction of technologies that provided more direct communication modes, such as the telephone. Lelia’s article demonstrates the scan as a reading practice often enabled by, or employed to negotiate, communication technologies. This is one theme that runs throughout this edition of M/C Journal. Simultaneously, “Scanning the Satellite” highlights the everyday nature of scanning, locating it within a history of communication developments that emphasise the ordinary status of scanning as a reading practice for engaging with the world around. This is the second theme that connects the articles in this edition. The scan is in itself nothing new; both the quick glance and the measured study are common practices. The articles gathered in this edition of M/C Journal consider scanning as a principal mode of engaging with the world. A quick glance at the morning weather, a hurried reading of a passing crowd, the habitual assessment of ourselves and our surroundings, an observation to ensure that everything is in its place. These are the practices of the scan that inform our everyday choices. They may be quick, habitual and disengaged, or, equally, measured, considered interrogations. The scan often evokes questions of surveillance, as Alexis Harley explores in “Resurveying Eden: Panoptica in Imperfect Worlds.” Examining the power relationship imposed by surveillance, Harley compares three observed states: the Bible’s Eden, Thomas More’s Utopia and Ridley Scott’s Blade Runner. Angelika Melchior also explores scanning as a mode of surveillance in “Tag and Trace Marketing”. Considering the Radio Frequency Identification tag (RFID), Melchior explores both the privacy concerns raised, and new business opportunities offered, by a technology that allows items to be continually scanned post-sale. In each of these texts surveillance is an intrusive practice that produces self-consciousness in the participants of both utopian and dystopian societies. Yet the self-consciousness that is so forcefully evoked through the practices of surveillance is provocatively abstracted by the commonplace practices of the scan. Here, the power relationships that are so familiar to discourses of surveillance are played out not by the ‘all-seeing powerful eye’ but by the practices that constitute the scan. They are the methods we apply when we scan our selves, our natural environments, our social environments, and, increasingly, our communications environments. The scan is a learnt short hand for accessing that which we consider important or interesting, alongside that which is in need of greater consideration. Our attention is particularly directed towards the ways in which we scan our communications environments. The broad range of communications content, platforms and technologies has produced an enormous communications environment to scan. There are channels to surf, sites to visit, stations to tune in to, pages to scroll, inboxes to clear, list-servs to read, blogs to catch up on; and all before lunch! Scanning our communications environments allows us to designate and relegate information that we consider to be not-for-us, for later consumption, of great newsworthiness or interest, or for immediate consumption. The cover image for this edition of M/C Journal, Julia Hennock’s “Future Perfect”, presents a speculative technological device so amenable to the scan: it shows a lens capable of producing perfect vision in all conditions. Her image is a reminder that scanning is very much a technological practice, and as changes to our media and communication environments encourage new scans, new tools will emerge to assist us in our response. Considering the scan as a technological practice is an element explored also in Yonatan Vinitsky’s film PANDEMONIUM. Vinitsky uses a flat bed scanner to capture 40 images of a man’s face, editing these together into a work that challenges the purposes of a domestic scanner. Jolting and at times erratic, Vinitsky encourages viewers to scan the film itself, glimpsing the still images as they pass. Robin Rimbaud’s “Scan and Deliver” also considers the constructive properties of the scan. Finding that the scan inevitably uncovers much superfluous information, Rimbaud constructed soundscapes from the excess data, discerning useful patterns from what is otherwise ostensibly random noise. Each of these creative texts considers the scan as a productive practice. This theme is also present in Charlene Elliot’s “Colour™: Law and the Sensory Scan”. Elliot positions the scan as the fundamental experience of the brand, where the emotive identity of a product or business is ideally conjured through a glimpse of colour. Colour trademarks attempt to compress a broad range of information, emotion and association into a form that can be scanned. These trademarks rely on the act of the scan to cut through cluttered advertising environs; colours draw attention, take no time to absorb and cut across cultural boundaries, they’re ideal for the scan. Michelle Kelly’s “Eminent Library Figures: A Reader” similarly considers the way the scan can deal with excesses of information. Discussing the function of the Cutter-Sanborn library classification system, Kelly considers the implications for authorship of the reduction of information into a scannable code – the author numbers written on the spine of a book. These numbers offer the potential of two types of scanning activity. Reducing author detail to a short string of characters, Cutter-Sanborn numbers allow the books in a collection to be quickly surveyed, individual copies to be located and their position amidst a collection specified. Representing a broader dataset, however, these numbers invite what Kelly refers to as an “analytical scan”, deeper investigation and further extrapolation of their meaning. Recognising the scan as a legitimate form of reading practice is a theme present in many of the articles in this edition of M/C Journal. Elizabeth Delaney’s “Scanning the Front Pages: The Schapelle Corby Judgment” examines the newspaper coverage of the Schapelle Corby case by looking at the front pages of Australian tabloid papers. As with Elliot’s piece, the scan is revealed here as an everyday activity, an ordinary practice used to trace a path through a saturated information environment. As a reading practice, the scan allows this material to be accessed quickly, it allows people to fit the consumption of information into their daily lives. Studying the way newspapers capitalise on the scan reveals the implications of editorial decisions that facilitate this reading practice. These methods go beyond the use of ‘screaming headlines’ to sell their message, using the ‘naturalised’ habits of the scanning reader to purposefully present their position. Henk Huijser turns to consider the implications for tertiary education of the ordinariness and prevalence of this reading practice. “Are Scanning Minds Dangerous Minds, or Merely Suspicious Minds? Harnessing the Net Generation’s Ability to Scan” considers the shifts in tertiary education delivery and assessment modes needed to respond to a student body more familiar with the scan than the deep read. After all, if scanning is a practice that can be learnt, it is a useful pedagogical tool and process that should be taught. In many regards scanning seems a poor response to what is often rich and valuable information. But it does allow for the filtering of information. Stephanie Dickison’s “So Many Books, So Little Time” playfully addresses the baneful outcome experienced by the reader adept at the scan: the every growing, personalised “to do list.” Dickison shows how scanning provides readers with some simple choices – to accept or reject, to classify as urgent or non-urgent – in the creation of a list for planned future consumption. Here, the scan is the quick glance for the later considered study. And with so much scannable information available why should we not, we argue, scan a lot rather than read a little? As we are constantly scanning, we are, after all, constantly reading and ultimately negotiating with, interacting with, learning from, and understanding about a whole range of environments. Positioning the scan as a legitimate and worthwhile reading practice shows that literacy (in terms of reading, writing and pedagogical practices) is perhaps equally a matter of breadth as it is of depth. Acknowledgments We thank Laura Marshall and Louise Firth for their work in copyediting the articles for this issue. Citation reference for this article MLA Style Green, Joshua, and Adam Swift. "Scan." M/C Journal 8.4 (2005). echo date('d M. Y'); ?> <http://journal.media-culture.org.au/0508/00-editorial.php>. APA Style Green, J., and A. Swift. (Aug. 2005) "Scan," M/C Journal, 8(4). Retrieved echo date('d M. Y'); ?> from <http://journal.media-culture.org.au/0508/00-editorial.php>.

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