Tendências na síntese e aplicação de alguns corantes reativos: Uma revisão

From last 25 years that many researchers have developed the novel reactive dyes with modification in structure of reactive dyes. In the present review paper concentrated development of reactive dyes. The review paper is focused on the highlight such dyes have having excellent dyeing properties and wet-fastness properties. This review paper express the monstrous impression of reactive dyes on the textiles coloration industry. Particularized details are given regarding evolution in the chemistry of reactive structure systems. It is additionally mentioned pointed out that advance research is mandatory to enhance dye fixation and wet-fastness properties. Reactive dyes have been used for the past hundred years for dyeing of cellulosic fabrics. A reactive dye has a chromophore, which is a group or an atom that is responsible for the dye’s colour. It has a component which reacts with the fabric or substrate. They have excellent fastness features due to the presence of covalent bonds that takes place during dyeing. The dyeing industry is dominated by the parties who can create dyes having excellent dyeing efficiency, stable, can be resistant to chemical actions and be affordable. In this review on development of synthesis reactive dyes has been provided. This review paper concentrated on research of reactive groups type. En los últimos veinticinco años, muchos investigadores han desarrollado nuevos colorantes reactivos con modificaciones en la estructura de los colorantes reactivos. En este artículo de revisión, nos enfocamos en el desarrollo de colorantes reactivos. El artículo de revisión se centra en resaltar tales tintes con excelentes propiedades de teñido y propiedades de solidez a la humedad. Este artículo de revisión expresa la monstruosa impresión de los colorantes reactivos en la industria del teñido textil. Se dan detalles particulares sobre la evolución en la química de los sistemas de estructura reactiva. Además, se menciona que se necesita investigación avanzada para mejorar las propiedades de fijación del tinte y resistencia a la humedad. Los colorantes reactivos se han utilizado durante los últimos cien años para teñir tejidos celulósicos. Un tinte reactivo tiene un cromóforo, que es un grupo o átomo responsable del color del tinte. Tiene un componente que reacciona con el tejido o sustrato. Tienen excelentes características de solidez debido a la presencia de enlaces covalentes que se producen durante el teñido. La industria del teñido está dominada por partes que pueden crear tintes con excelente eficiencia de teñido, estables, resistentes a los químicos y asequibles. En esta revisión, se proporcionó el desarrollo de colorantes de síntesis reactiva. Este artículo de revisión se centró en la investigación de tipo de grupo reactivo.Nos últimos vinte e cinco anos, muitos pesquisadores desenvolveram novos corantes reativos com modificações na estrutura dos corantes reativos. No presente artigo de revisão, concentrou-se o desenvolvimento de corantes reativos. O artigo de revisão está focado no destaque que tais corantes têm com excelentes propriedades de tingimento e propriedades de resistência à umidade. Este artigo de revisão expressa a impressão monstruosa de corantes reativos na indústria de coloração têxtil. Detalhes particulares são dados sobre a evolução na química de sistemas de estrutura reativa. Além disso, é mencionado que pesquisas avançadas são necessárias para melhorar a fixação do corante e as propriedades de resistência à umidade. Os corantes reativos têm sido usados nos últimos cem anos para tingir tecidos celulósicos. Um corante reativo tem um cromóforo, que é um grupo ou átomo responsável pela cor do corante. Tem um componente que reage com o tecido ou substrato. Possuem excelentes características de solidez devido à presença de ligações covalentes que ocorrem durante o tingimento. A indústria de tingimento é dominada pelas partes que podem criar corantes com excelente eficiência de tingimento, estáveis, resistentes a ações químicas e acessíveis. Nesta revisão, o desenvolvimento de corantes reativos de síntese foi fornecido. Este artigo de revisão concentrou-se na pesquisa do tipo grupos reativos

Decay modes of 250No

The Fragment Mass Analyzer at the ATLAS facility has been used to unambiguously identify the mass number associated with different decay modes of the nobelium isotopes produced via 204Pb(48Ca,xn)(252-x)No reactions. Isotopically pure (>99.7%) 204Pb targets were used to reduce background from more favored reactions on heavier lead isotopes. Two spontaneous fission half-lives (t_1/2 = 3.7+1.1-0.8 us and 43+22-15 us) were deduced from a total of 158 fission events. Both decays originate from 250No rather than from neighboring isotopes as previously suggested. The longer activity most likely corresponds to a K-isomer in this nucleus. No conclusive evidence for an alpha branch was observed, resulting in upper limits of 2.1% for the shorter lifetime and 3.4% for the longer activity.Comment: RevTex4, 10 pages, 5 figures, submitted to PR

Evaluating the impact of caching on the energy consumption and performance of progressive web apps

Context. Since today mobile devices have limited battery life, the energy consumption of the software running on them can play a strong role with respect to the success of mobile-based businesses. Progressive Web Applications (PWAs) are built using common web technologies like HTML, CSS, and JavaScript and are commonly used for providing a better user experience to mobile users. Caching is the main technique used by PWA developers for optimizing network usage and for providing a meaningful experience even when the user's device is offline. Goal. This paper aims at assessing the impact of caching on both the energy consumption and performance of PWAs. Method. We conducted an empirical experiment targeting 9 real PWAs developed by third-party developers. The experiment is designed as a 1 factor-2 treatments study, with the usage of caching as the single factor and the status of the cache as treatments (empty vs populated cache). The response variables of the experiment are (i) the energy consumption of the mobile device and (ii) the page load time of the PWAs. The experiment is executed on a real Android device running the Mozilla Firefox browser. Results. Our results show that PWAs do not consume significantly different amounts of energy when loaded either with an empty or populated cache. However, the page load time of PWAs is significantly lower when the cache is already populated, with a medium effect size. Conclusions. This study confirms that PWAs are promising in terms of energy consumption and provides evidence that caching can be safely exploited by PWA developers concerned with energy consumption. The study provides also empirical evidence that caching is an effective technique for improving the user experience in terms of page loading time of PWAs

Results of rocket measurements of D-region ionization over Thumba in MAP

Under MAP, two rockets were launched from Thumba (8.5 N, 76.8 E) around 1030 hrs Lt with identical payloads on 7 and 10 March 1986 for D region studies. Positive ion densities were measured by spherical probe and Gerdien condenser and electron densities were measured by Langmuir probe and propagation experiments. In both flights a valley in ionization height profile was noticed around 83 km. The density of ionization at this altitude was about 4 x 10(2) cu cm. A detailed positive ion-chemical scheme was used to reproduce the measured ionization height profiles. The density of NO needed to reproduce the valley in ionization at 83 km came around 5 x 10(5) cu cm. A photochemical treatment without diffusion process was found inadequate to explain this value of NO. Calculations showed that the value of vertical eddy diffusion needed to reproduce the value of NO was around 10(6)sq cm/s. Interestingly, the same value of eddy diffusion coefficient was obtained when derived in the manner described by Thrane and his coworkers using only the positive ion current data of spherical probes

Anomalous isomeric decays in 174Lu as a probe of K-mixing and interactions in deformed nuclei

A Kπ=13+, 280 ns four-quasiparticle isomer in the odd-odd nucleus 174Lu has been identified and characterized. The isomer decays to both Kπ=7+ and Kπ=0+ rotational bands obtained from the parallel and antiparallel coupling of the proton 7/2+[404] and neutron 7/2+[633] orbitals. K mixing caused by particle-rotation coupling explains the anomalously fast transition rates to the 7+ band but those to the 0+ band are caused by a chance degeneracy between the isomer and a collective state, allowing the mixing matrix element for a large K difference to be deduced

A review on a deep learning perspective in brain cancer classification

AWorld Health Organization (WHO) Feb 2018 report has recently shown that mortality rate due to brain or central nervous system (CNS) cancer is the highest in the Asian continent. It is of critical importance that cancer be detected earlier so that many of these lives can be saved. Cancer grading is an important aspect for targeted therapy. As cancer diagnosis is highly invasive, time consuming and expensive, there is an immediate requirement to develop a non-invasive, cost-effective and efficient tools for brain cancer characterization and grade estimation. Brain scans using magnetic resonance imaging (MRI), computed tomography (CT), as well as other imaging modalities, are fast and safer methods for tumor detection. In this paper, we tried to summarize the pathophysiology of brain cancer, imaging modalities of brain cancer and automatic computer assisted methods for brain cancer characterization in a machine and deep learning paradigm. Another objective of this paper is to find the current issues in existing engineering methods and also project a future paradigm. Further, we have highlighted the relationship between brain cancer and other brain disorders like stroke, Alzheimer’s, Parkinson’s, andWilson’s disease, leukoriaosis, and other neurological disorders in the context of machine learning and the deep learning paradigm

High-spin spectroscopy in 207^{207}At: Evidence of a 29/2+^{+} isomeric state

Yrast and near-yrast states above the known 25/2$^{+}$ isomer in $^{207}$At are established for the first time. The level scheme is extended up to 47/2$\hbar$ and 6.5 MeV with the addition of about 60 new $\gamma$-ray transitions. The half-life of the 25/2$^{+}$ isomer is revisited and a value of $T_{1/2}$ = 107.5(9) ns is deduced. Evidence of a hitherto unobserved 29/2$^{+}$ isomer in $^{207}$At is presented. A systematic study of $B(E3)$ values for the transitions de-exciting the 29/2$^{+}$ isomer in the neighboring odd-$A$ At isotopes suggests a half-life in the 2$-$4 $\mu$s range for this state in $^{207}$At. The experimental results are compared with large-scale shell-model calculations performed using the KHM3Y effective interaction in the $Z$ = 50$-$126, $N$ = 82$-$184 model space and an overall good agreement is noted between the theory and the experiment. A qualitative comparison of the excited states and the isomers with analogous states in neighboring nuclei provides further insight into the structure of $^{207}$At.Comment: 15 pages, 13 figure

Anomalous isomeric decays in Lu-174 as a probe of K mixing and interactions in deformed nuclei

A K-pi=13(+), 280 ns four-quasiparticle isomer in the odd-odd nucleus Lu-174 has been identified and characterized. The isomer decays to both K-pi=7(+) and K-pi=0(+) rotational bands obtained from the parallel and antiparallel coupling of the proton 7/2(+)[404] and neutron 7/2(+)[633] orbitals. K mixing caused by particle-rotation coupling explains the anomalously fast transition rates to the 7(+) band but those to the 0(+) band are caused by a chance degeneracy between the isomer and a collective state, allowing the mixing matrix element for a large K difference to be deduced