Spectroscopy

This dissertation aims to investigate the electrical impedance properties of fruits and vegetables, and explore the relationship between impedance and quality criteria. In particular, the present dissertation outlines experimental research conducted on relationships between impedance properties and fruit tastes as well as the impedance changes observed during ripening process. Impedance measurement to monitor moisture content changes in the progress of drying is also included in this research.

116p runthenight05 01-03-2023 7 3   Download

The focus of this study is to investigate its optical and conductive properties under different conditions of doping environments, temperature and polymerization conditions. Optical characterization technique such as UV-Visible spectroscopy is developed to carry out the investigation. The developed nanofibers have been demonstrated to possess optical and conductive properties to be dependent on doping variables. Study of these optical properties could prove very useful in the development of electrochromic devices and gas sensors.

103p runthenight07 01-03-2023 8 3   Download

The objectives of this research work are: Study the clay intercalation by organic dye and develop a process to produce nanoclay-dye pigment with better stability and good performance; Conduct structural characterization to verify the level of intercalation and stability of clay-dye pigment by using X-Ray diffraction (XRD) and Transmission Electron Microscopy (TEM); Investigate the thermal stability of clay dye pigment using Thermo Gravimetric Analysis (TGA) to reveal the effect of dye intercalation into the clay on improving thermal stability of organic dye; Compound the clay- pigment with ...

141p runthenight07 01-03-2023 5 3   Download

This work investigates the generation of neutron flux inside lead shielding due to cosmic rays as a function of shielding thickness by use of the GEANT Monte-Carlo modelling code. GEANT allows for the Monte-Carlo modelling of the transport of particles in matter. This includes muons, the particles of interest here, which originate from cosmic ray showers.

109p runthenight07 01-03-2023 9 3   Download

Aim of the thesis: Development of a new method for determining concentration of the radionuclides in enviromental samples by mean of gamma spectroscopy. Establishing a data set of the soil-plant transfer factor (TF) of radionuclides 238U, 232Th and 40K for some vegetables in Truong Sa island and that of 238U, 232Th, 40K and 137Cs for tea tree from Luong My farm, Hoa Binh province, Vietnam and evaluate the influence of natural radionuclide concentration to the soil-plant transfer process of artificial radionuclide 137Cs.

30p extraenglish 24-05-2021 25 3   Download

It was demonstrated that Poly(p-Xylylene) (PPX) could be prepared from α,α’-Bis(Alkoxy or Aryloxy) –p-Xylenes via chemical vapor decomposition (CVD)- method. This is one-step process and there are side products by the CVD-process. This effect depends both on the CVD- condition and the properties of the starting monomer. The structure and thermal behavior of the material were characterized by FTIR, UVvis spectroscopy, elemental analysis, wide-angle X-ray diffraction, DTA and DSC.

14p 12120609 01-06-2020 17 1   Download

SGaRD (Spectroscopy, Gamma rays, Rapid, Deterministic) code is used for the fast calculation of the gamma-ray spectrum, produced by a spherical shielded source and measured by a detector. The photon source lines originate from the radioactive decay of the unstable isotopes.

8p christabelhuynh 30-05-2020 19 4   Download

In this study, we investigated the microstructure of such doped fuels as well as a reference standard UO2 by positron annihilation spectroscopy (PAS). Although this technique is particularly sensitive to lattice point defects in materials, a wider application in the UO2 research is still missing.

5p christabelhuynh 30-05-2020 6 1   Download

In this article, we will first discuss the issues of the prompt g-ray spectroscopy regarding the control of all the uncertainties involved in the (n,n0g) cross section estimation. Secondly, we will focus on the role of theoretical modeling which, in certain cases, is crucial to reach the objectives of a few percent uncertainty on the (n,n0) cross sections.

9p christabelhuynh 29-05-2020 5 2   Download

The presence of heterocyclic moiety in diverse compounds, strongly indicative of the desired effect on physiological activity, and it reflects on efforts to find useful synthetic drugs.

12p tocectocec 25-05-2020 17 2   Download

The corrosion inhibition efficiencies of two novel Schiff bases, namely (E)-3-[thiophen-2-lmethyleneamino]benzoic acid (T2YMABA) and (E)-4-(5-[(2-phenylhydrazono) methyl]thiophen-2-yl)benzoic acid (PHMT2YBA) on mild steel (MS) in 1.0M HCl solution has been investigated and compared using electrochemical impedance spectroscopy and potentiodynamic polarization analysis.

10p tocectocec 25-05-2020 19 2   Download

In this article, magnetically nanoparticles (MNPs) of CuFe2O4 were prepared and characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy techniques.

10p tocectocec 25-05-2020 16 0   Download

Bài thuyết trình Phương pháp quang phổ Raman phân giải thời gian (Time-resolved Raman (TR ) spectroscopy) sau đây bao gồm những nội dung về đối tượng phân tích, nguyên lí đo thiết bị đo, ứng dụng của phương pháp quang phổ Raman phân giải thời gian.

8p maiyeumaiyeu10 17-09-2016 107 8   Download

Bài thuyết trình Vật lý ứng dụng: Matrix-Isolation Raman Spectroscopy đưa ra lịch sử, nguyên lý, thiết bị và ứng dụng của kỹ thuật MI (Matrix-Isolation). Mời các bạn tham khảo bài thuyết trình để hiểu rõ hơn về những nội dung này.

18p maiyeumaiyeu10 17-09-2016 65 2   Download

Bài thuyết trình Matrix – Isolation raman spectroscopy bao gồm những nội dung về kỹ thuật MI(Matrix-Isolation), phương pháp tổng hợp các phân tử mẫu MI, cấu tạo của thiết bị tạo mẫu MI, phổ MI Raman, ứng dụng của phổ MI Raman.

31p maiyeumaiyeu10 17-09-2016 68 5   Download

Bài giảng Phổ Raman sai phân giới thiệu tới các bạn những nội dung về xác định tỷ số khử phân cực, raman difference spectroscopy. Mời các bạn tham khảo bài giảng để bổ sung thêm kiến thức về lĩnh vực này. Với các bạn chuyên ngành Điện - Điện tử thì đây là tài liệu hữu ích.

8p maiyeumaiyeu09 16-09-2016 26 2   Download

Mục tiêu nghiên cứu của luận án: Chế tạo hai hệ xúc tác CS và MCS, đặc trưng các xúc tác bằng các phương pháp hóa lý hiện đại, trong đó sử dụng phương pháp phổ hấp thụ tia X (X-Ray Absorption Spectroscopy - viết tắt là XAS) - phương pháp phân tích cấu trúc mới, hiện đại, để đặc trưng sâu hệ thống liên kết trong xúc tác.

184p change12 30-06-2016 100 10   Download

Mục tiêu nghiên cứu của luận án: Chế tạo hai hệ xúc tác CS và MCS, đặc trưng các xúc tác bằng các phương pháp hóa lý hiện đại, trong đó sử dụng phương pháp phổ hấp thụ tia X (X-Ray Absorption Spectroscopy – viết tắt là XAS) – phương pháp phân tích cấu trúc mới, hiện đại, để đặc trưng sâu hệ thống liên kết trong xúc tác;... Sau đây là bản tóm tắt của luận án.

26p change00 05-05-2016 78 6   Download

FTIR spectroscopy has been applied to study the coordination structures of Mg2þ and Ca2þ ions bound in Akazara scallop troponin C (TnC), which contains only a single Ca2þ binding site. The region of the COO – antisymmetric stretch provides information about the coordination modes of COO – groups to the metal ions: bidentate, unidentate, or pseudo-bridging. Two bands were observed at 1584 and 1567 cm21 in the apo state, whereas additional bands were observed at 1543 and 1601 cm21 in the Ca2þ-bound and Mg2þ-bound states, respectively.

7p system191 01-06-2013 40 2   Download

Porcine heart cytoplasmic malate dehydrogenase (s-MDH) is a dimeric protein (2 · 35 kDa). We have studied equilibrium unfolding and refolding of s-MDH using activity assay, fluorescence, far-UV and near-UV circular dichroism (CD) spectroscopy, hydrophobic probe-1-anilino8-napthalene sulfonic acid binding, dynamic light scattering, and chromatographic (HPLC) techniques. The unfolding and refolding transitions are reversible and show the presence of two equilibrium intermediate states.

11p system191 01-06-2013 38 4   Download