Spectroscopy - Science method

Aceites esenciales y aplicaciones

This paper offers a clear methodology for the characterization of cold atmospheric plasmas and their development. The optical emission spectra of an Ar/O2 plasma jet produced in a plasma jet system at constant flow rates and for various potential discharges between 14 kV and 18 kV revealed that variations in voltage caused a significant difference...

Here, we introduce a miniature beamline for transient absorption and dispersion spectroscopy, using a tailored deep ultraviolet field immediately after the noncollinear generation without subsequent optical elements. We explore the near-band-gap region in diamond in the presence of a few-femtosecond pump pulse where the delayed dynamical Franz-Keld...

New techniques in core-electron spectroscopy are necessary to resolve the structures of oxides of f-elements and other strongly correlated materials that are present only as powders and not as single crystals. Thus, accurate quantum chemical methods need to be developed to calculate core spectroscopic properties in such materials. In this contribut...

To enhance the sensitivity of detecting Cu and Zn in aluminum alloys, we incorporated a spark discharge unit into the femtosecond laser-induced breakdown spectroscopy (fs-LIBS) system, forming a femtosecond laser ablation spark-induced breakdown spectroscopy (fs-LA-SIBS) system. We utilized both fs-LA-SIBS and fs-LIBS techniques to detect Cu and Zn...

Small-angle neutron scattering (SANS) is widely used as a powerful technique to study the higher-order structure of soft matter. To increase the reliability of SANS profile analysis for complex multi-component systems, combining different types of structural information obtained by other methods is desirable. A simultaneous measurement system combi...

Se ha demostrado que el incluir a la inulina en la ingesta diaria proporciona beneficios para la salud de nuestro organismo, así como la disminución de problemas gastrointestinales. Problemas que son muy frecuentes en personas con autismo principalmente al presentar selectividad a los alimentos y que por su condición pueden vivir con altos niveles...

Investigation of possible multi-modal fission modes in 235U(nth,f) following fission fragment spectroscopy

In this study, the effects of different types of Mn precursors (MnO2 and Mn2O3) and sintering temperature on the defect dipole formation, ferroelectric aging and electrical properties were investigated by using Ba0.95Sr0.05TiO3 ceramics as the base. Both Mn precursors were substituted to the Ti-site as 1 mol% and two different sintering temperature...

1 Program Studi Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Palangka Raya, Kampus UPR Tanjung Nyaho, Palangkaraya 73111, Indonesia Kata kunci Abstrak Kesehatan, Medis, Instrumen, FTIR, Spektrometri Massa Kesehatan adalah suatu hal penting dari sebuah kehidupan seorang manusia. Kualitas pelayanan kesehatan merupakan tingkat keu...

Probing non-equilibrium dynamics with single-molecule spectroscopy is important for dissecting biomolecular mechanisms. However, existing microfluidic rapid-mixing systems for this purpose are incompatible with surface-adhesive biomolecules, exhibit undesirable flow dispersion and are often demanding to fabricate. Here we introduce droplet-based mi...

Um sistema de análise de gases tendo um laser de cascata quântica e um sensor fotoacústico diferencial foi caracterizado para detectar concentrações de partes por bilhão em volume (ppbv) de etileno. O limite de detecção experimentalmente atingido para o aparato foi de 100 ppbv. Com isso, será possível utilizá-lo no sensoriamento dessa molécula, dad...

Segundo a Federação Internacioanal de Diabetes, o número de aldultos diabéticos ao redor do mundo em 2019 superara 460 milhões de pessoas com uma previsão de crescimento de mais de 50% desse valor total até 2045. Devido a isso, é salutar o desenvolvimento de métodos de diagnóstico para essa doença e a técnica de espectroscopia na detecção biomarcad...

INTRODUÇÃO: O álcool constitui uma das principais causas de úlceras gástricas (UG). O tratamento padrão está associado a efeitos colaterais. Desta forma, os biopolímeros constituem uma alternativa promissora. Dentre estes biopolímeros, a goma do angico (GA) apresenta atividade benéfica em distúrbios gastrointestinais. No entanto, não há estudos ava...

Recently, semiconductor nanograting layers have been introduced and their optical properties have been studied. Spectroscopic ellipsometry has shown that nanograting significantly modifies the dielectric function of c-Si layers. Photoluminescence spectroscopy reveals the emergence of an emission band with a remarkable peak structure. It has been ob...

The Sip-39 pair’s galaxies have been investigated using photometric and spectroscopic methods; the observation data was collected from the SDSS's Data Release (DR17) and fitted to ellipses through utilizing the Image Reduction and Analysis Facility (IRAF) with STSDAS Library using ELLIPS task. The surface brightness of the two galaxies in the pair,...

太赫兹波为高能量密度物质提供了独一无二的诊断手段，但在大型高能量密度装置上实现极端条件下物质 状态的太赫兹时域光谱诊断技术仍面临巨大挑战。本文报道了在低重复频率、高能量激光装置上开展的光脉冲泵 浦-太赫兹探测实验。利用钛宝石飞秒激光器输出焦耳量级的单发脉冲，单发脉冲经磷酸二氢钾倍频后加热30 nm 厚自支撑金膜，产生均匀的温稠密金等离子体；同时，将大孔径铌酸锂晶片通过光整流产生的单脉冲能量为7 μJ 的 太赫兹脉冲作为探测光，利用金属阶梯镜实现了单发太赫兹波形探测，获得了温稠密金在太赫兹波段的时间分辨的 电导率数据，为检验双温模型中电子-离子耦合系数等关键参数的准确性提供了新基准。

Se presentan cuatro casos de simulación de propiedades de materiales. En el primer caso existen medidas experimentales y se trata de elaborar una teoría que las reproduzca. En el segundo caso hay evidencia experimental de la existencia de un defecto y se trata de diseñar una teoría que permita realizar experimentos más definitivos. En el caso sigui...

Understanding the characteristics of intrinsic defects in crystals is of great interest in many fields, from fundamental physics to applied materials science. Combined investigations of scanning tunneling microscopy/spectroscopy (STM/S) and...

A new approach for early detection of multiple cancers is presented by integrating SERS spectroscopy of serum molecular fingerprints and machine learning.

The paper presents the results of an experimental study of the current-voltage characteristics in the DC electrolysis of 10 wt% Na2CO3 aqueous solution covering three operational regimes: Faradaic, transition, and regime of the plasma-driven solution electrolysis (PDSE). An interpretation of the current-voltage characteristic is given, especially f...

Cobalt and vanadium complexes with (E)-2-(2-hydroxy-3- methoxybenzylidene)hydrazine-1-carboxamide were synthesized. The ligand was structurally characterized by FTIR, 1HNMR and 13CNMR spectroscopy. The interaction activity of ligand and complexes was investigated with DNA by spectroscopical and physical methods. The results showed an intercalative...

The Al25(p,γ) reaction has long been highlighted as a possible means to bypass the production of Al26 cosmic γ rays in classical nova explosions. However, uncertainties in the properties of key resonant states in Si26 have hindered our ability to accurately model the influence of this reaction in such environments. We report on a detailed γ-ray spe...

The existing experimental data for the γ decay of the stable N=Z doubly-odd nuclei and the β decay of the corresponding isospin multiplets is reviewed. The structure of the lightest nuclei with masses A≤14 is used to test and constrain ab initio nuclear theories. Most of the data were obtained in the second half of the last century and, in some cas...

We report the direct formation of dicarboxylate-based coordination polymer glasses through thermal dehydration. The rearrangement of the coordination networks caused by dehydration was monitored by in-situ powder X-ray diffraction, infrared spectroscopy, and synchrotron X-ray characterizations. The microporosity and mechanical properties of these g...

We report precise measurement of the hyperfine splitting and calculation of the Zeeman coefficients of the $^{171}$Yb$^+$ ground state. The absolute hyperfine splitting frequency is measured using high-resolution laser-microwave double-resonance spectroscopy at 0.1 mHz level, and evaluated using more accurate Zeeman coefficients. These Zeeman coeff...

Single-atom catalysts (SACs) have become one of the most attractive frontier research fields in catalysis and energy conversion. However, due to the atomic heterogeneity of SACs and limitations of ensemble-averaged measurements, the essential active sites responsible for governing specific catalytic properties and mechanisms remain largely conceale...

Optical microcavities are often proposed as platforms for spectroscopy in the single- and few-photon regime due to strong light-matter coupling. For classical-light spectroscopies, an empty microcavity simply acts as an optical filter. However, we find that in the single- or few-photon regime treating the empty microcavity as an optical filter does...

No Brasil, existe uma carência de pesquisa relacionada a espectroscopia de meteoros, por este motivo o trabalho desenvolvido pode ser considerado pioneiro. Para esta pesquisa, foi instalada uma estação de monitoramento em vídeo de meteoros, como as usadas pela BRAMON no âmbito do projeto PATRICIA, com uma rede de difração acoplada à câmera, de modo...

To overcome challenging service conditions, a groundbreaking thermoset, “Super-Tough Resin” (STR), has been specifically designed for steel bridge deck paving. Currently, investigations of paving thermosets mainly focus on cured materials. Detailed investigations of the curing process and its impact on the evolving properties of STR are lacking. Th...

Many important details on the mechanisms underlying the ejection of material during a (classical) nova eruption are still not understood. Here we present optical spectroscopy and narrow-band images of the nova V1425 Aql, 23 years after the nova eruption. We find that the ejecta consist of two significantly different components. The first resembles...

Herein, a push-pull type stilbene compound and its [2 + 2] photocyclized cyclobutane derivative were synthesized and isolated. The structure characterizations were performed by mass, NMR, crystal structure, and TG-DSC analysis. In addition, the electronic structures and structure-property relationships of the molecules have been analyzed by compari...

The world's largest sample of Jpsi events collected at BESIII detector offers a unique opportunity to investigate eta and eta' physics via the Jpsi radiative or hadronic decays with unprecedented precision. In recent years the BESIII experiment has made significant progresses in eta/eta' decays. A selection of recent highlights in light meson spect...

O uso de óleo vegetal na fritura tem sido substituído pelo uso da panela airfryer. A nova BNCC visa uma aprendizagem contextualizada com temas mais palpáveis aos estudantes do Ensino Médio (EM). Neste trabalho foi elaborado um Caderno Temático sobre aprendizagem do tema “lipídeos” para estudantes do EM pelo estudo experimental do óleo alimentar. Fe...

In this paper, a design method of diffraction structure based on metasurface is proposed for light splitting and focusing simultaneously. In the method, firstly, the light field calculation model of the proposed structure is established based on Fresnel diffraction and the transmittance function is calculated. Then, the model structural parameter s...

Longitudinal optical field modulation is very important for applications such as optical imaging, spectroscopy, and optical manipulation. It can achieve high-resolution imaging or manipulation of the target object, but it is also limited by its depth of focus. The depth of focus determines whether the target object can be clearly imaged or manipula...

Rapid advancement of novel optical spectroscopy and imaging systems relies on the availability of well-characterised and reproducible protocols for phantoms as a standard for the validation of the technique. The...

Based on a prior university patent, the authors developed a novel type of bioimpedance-based test method to noninvasively detect nonalcoholic fatty liver disease (NAFLD). The development of a new potential NAFLD diagnostic procedure may help to understand the underlying mechanisms between NAFLD and severe liver diseases with a painless and easy-to-...

The large dataset collected in proton-proton collisions at the LHC allows precision studies and discovery of new states in the field of conventional and exotic heavy-hadron spectroscopy; both are crucial to understand QCD dynamics and binding rules. This is possible due to high luminosity, high b/c-hadron production cross-section and the unique, de...

Spectroscopic information on exotic Br and Nb nuclei, with odd and even masses around A=100, respectively, was obtained by analyzing fission fragments data collected with AGATA+VAMOS++ at GANIL and the FIPPS spectrometer at ILL. The complementarity of these two state-of-the art setups has been used, for the first time, to investigate the structure...

Water leakage of the insulation sheath can lead to a decrease in the insulation performance of the power cable, which poses a hidden danger to the power cable. Accurate detection and positioning of the water leakage area are crucial for improving power safety and stability. In response to the water leakage defect of the cable insulation sheath, thi...

An experiment with the aim to obtain information on the excited states of neutron-rich nuclei with N~82 was performed at RIBF/RIKEN as part of the HiCARI campaign. The method to identify nuclei on ion-by-ion basis, including charge-state identification, is presented. The Doppler correction technique was validated using the test case of ¹³¹ In, base...

The precise understanding of the interaction inside the nucleons is still an open question in hadron spectroscopy. To tackle this issue, nucleons are excited by photons and their excitation spectra are determined. This effort is addressed by several different experiments worldwide, where different polarization observables are extracted for various...

We have selected 337 intermediate and high-mass YSOs ($1.5$ to $20$ M$_{\odot}$) well-characterised with spectroscopy. By means of the clustering algorithm HDBSCAN, we study their clustering and association properties in the Gaia DR3 catalogue as a function of stellar mass. We find that the lower mass YSOs ($1.5-4$ M$_{\odot}$) have clustering rate...

The coexistence of the charge-density wave (CDW) and superconducting phases and their tunability under external pressure remains one of the key points in understanding the electronic structure of A V 3 Sb 5 ( A = K, Rb, Cs) kagome metals. Here, we employ synchrotron-based infrared spectroscopy assisted by density-functional calculations to study th...

Electrochemical and localized corrosion behavior of a 4045/7072/3003 M/4045 Al alloy composite in 3.5 wt.% NaCl solution was investigated from cross-sectional and plane directions by electrochemical impedance spectroscopy, polarization curves, and high-resolution microscopic examination. Plane directions showed higher corrosion resistance than the...

La comprensión de las propiedades de óxidos metálicos es fundamental para diversas aplicaciones tecnológicas. Este trabajo aborda el estudio detallado de mezclas binarias de óxidos metálicos, específicamente Fe2O3 y MgO, utilizando brucita como precursor y analizadas mediante DRX y espectroscopía UV-vis. Se identificó una clara correlación entre la...

Determining the pairing symmetry of single-layer FeSe on SrTiO3 is the key to understanding the enhanced pairing mechanism. It also guides the search for superconductors with high transition temperatures. Despite considerable efforts, it remains controversial whether the symmetry is the sign-preserving s- or the sign-changing s±-wave. Here, we inve...

This work discusses the connection between isospectrality and configurational entropy in holographic bottom-up models. We analyze the effect of monoparametric isospectral transformation in holographic decay constants and configurational entropy for a set of softwall-like models at zero temperature. We conclude that the isospectral parameter $\lambd...

In this study new antioxidant compounds were prepared by (thiol-ene) click chemistry, where these compounds were prepared using (1:1) mole ratio of (thiol : eugenol) in the presence of benzoyl peroxide as initiator and the reaction is carried out at (100 0C) for (9) hrs. (FT-IR), (1HNMR), and mass spectroscopy were used to characterize the synthesi...

Artificial Kitaev chains, formed by quantum dots coupled via superconductors, have emerged as a promising platform for realizing Majorana bound states. Even a minimal Kitaev chain (a quantum dot--superconductor--quantum dot setup) can host Majorana states at discrete sweet spots. However, unambiguously identifying Majorana sweet spots in such a sys...

We report the spectroscopy of 11 electronic states in the radioactive molecule radium monofluoride (RaF). The observed excitation energies are compared with state-of-the-art relativistic Fock-space coupled cluster (FS-RCC) calculations, which achieve an agreement of >99.71% (within ~8 meV) for all states. High-order electron correlation and quantum...

A bstract We calculate the soft function using lattice QCD in the framework of large momentum effective theory incorporating the one-loop perturbative contributions. The soft function is a crucial ingredient in the lattice determination of light cone objects using transverse-momentum-dependent (TMD) factorization. It consists of a rapidity-independ...

Glucosinolates (GSLs), compounds with potential chemo‐preventative properties, can be affected by pre‐ and post‐harvest processes. Therefore, monitoring their content is important for the food and agricultural industries. This study evaluates the application of mid‐infrared (MIR) spectroscopy for the determination of GSLs in commercial broccoli ( B...

Hyperfine structure of the ground rotational level of the metastable $^3\Delta_1$ electronic state of $^{180}$HfF$^+$ ion is calculated at presence of variable external electric and magnetic fields. Calculations are required for analysis of systematic effects in experiment for electron electric dipole moment ($e$EDM) search. Different perturbations...

Oryza sativa (arroz) e Musa cavendishii (banana) são espécies importantes nas plantações no Estado do Tocantins, configurando-se como fontes de biomassas residuais lignocelulósicas. A presente pesquisa teve como objetivo comparar parâmetros químicos presentes nas duas fibras, visando identificar qual delas possui maior potencial para extração de na...

Dibenzopentacene is a close analogue of pentacene, but it attracted much less attention than its acene cousin, and its solid-state photophysics remains nearly unknown. In this work we present the...

To avoid hydrogen flaking in rail production, it is of crucial importance to understand the differences in hydrogen diffusion and trapping between different production steps. Therefore, as-cast unfinished material was compared with two finished rails, hot-rolled and head-hardened, using electron backscattered diffraction (EBSD), electrochemical per...

TU Tau (= HD 38218 = HIP 27135) is a binary system consisting of a C-N carbon star primary and an A-type secondary. We report on new photometry and spectroscopy which tracked the recent disappearance of the A-star secondary. The dimming of the A-star was gradual and irregular, with one or more brief brightenings, implying the presence of nonhomogen...