scholarly journals Assessment of the quality of the magnetic concentrates of the titanium ores at Pizhemsky deposit from the point of view of the technological mineralogy

2019 ◽  
pp. 31-41 ◽  
Author(s):  
V. P. Lyutoev ◽  
A. B. Makeyev
Keyword(s):  
Analysis Data ◽  
Point Of View ◽  
Magnetic Fraction ◽  
Ir Absorption ◽  
Medium Thickness ◽  
Paramagnetic Resonance ◽  
Rare Earth Minerals ◽  
Electron Paramagnetic ◽  
Technological Sample

Four magnetic fractions of small classes concentrates (0,05—0,125 mm) of a representative technological sample have been separated from titanium-bearing medium thickness sandstones of Malorucheysky unit (Pizhemsky titanium deposit). They have been studied: general sample (T-2) and three partial (T-l a, b, c) ones obtained by gravitational separation in heavy liquid in three density intervals (3,3—3,5; 3,5—3,7; 3,7—3,9 g/cm3). It has been demonstrated that the magnetic fraction of the small productive classes consists mainly of pseudorutil, ilmenite, siderite (ironstone) and garnet. The phase composition of iron-titanium phases has been reliably established by the means of normative recalculation of chemical analysis data, as well as methods of Mossbauer spectroscopy, infrared (IR) absorption and electron paramagnetic resonance (EPR). The ratio of the pseudorutile, ilmenite, siderite and associated rare earth minerals monazite-kularite and zircon accumulated in the respective gravity classes, has been computed . It has been recommended to use the methods of recovery of the concentrates (extraction of zircon and monazite) before the operation of desilication, as well as their purification from siderite.

Glutaraldehyde effect on hemoglobin: evidence for an ion environment modification based on electron paramagnetic resonance and Mossbauer spectroscopies

1990 ◽  
Vol 68 (4) ◽  
pp. 813-818 ◽  
Author(s):  
Alain Chevalier ◽  
Didiers Guillochon ◽  
Naima Nedjar ◽  
Jean Marie Piot ◽  
Mokambes Waran Vijayalakshmi ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Functional Properties ◽  
Oxygen Affinity ◽  
Blood Substitute ◽  
Blood Substitutes ◽  
Point Of View ◽  
Cross Linking ◽  
Redox Potentials ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Glutaraldehyde is a widely used reagent for hemoglobin cross-linking in blood substitutes research. However, hemoglobin polymerization by glutaraldehyde involves modifications of its functional properties, such as oxygen affinity, redox potentials, and autoxidation kinetics. The aim of this article is to investigate, by electron paramagnetic resonance and Mossbauer spectroscopies, the changes that occur in the iron environment after glutaraldehyde cross-linking. Spectrometric studies were performed with native hemoglobin and hemoglobin cross-linked as soluble and insoluble polymers. Spectrometry data comparison with glutaraldehyde-modified hemoglobin functional properties allows to interpret from a structural point of view that glutaraldehyde action occurs as a decrease of the O—N(F8His) distance, an increase of the Fe—N(F8His) bond length, and the decrease of the distal-side steric hindrance.Key words: hemoglobin, glutaraldehyde, Mossbauer spectroscopy, electron paramagnetic resonance, blood substitute.

Quality of Bulk CdTe Substrates and its Relation to Intrinsic Defects

1994 ◽  
Vol 299 ◽  
Author(s):  
B. K. Meyer ◽  
D. M. Hofmann ◽  
W. Stadler ◽  
P. Emanuelsson ◽  
P. Omling ◽  
...  
Keyword(s):  
Negative Charge ◽  
Acceptor Level ◽  
Dangling Bond ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Electron Paramagnetic ◽  
Jahn Teller Distortion

AbstractBoth the cadmium vacancy (Vcd) and the tellurium vacancy (VTe) in CdTe are identified by means of electron paramagnetic resonance (EPR). The Vcd is a double acceptor and the EPR spectrum is observed in its single negative charge state. The symmetry is found to be trigonal, which can be explained in a model in which the hole occupies a dangling bond t2 orbital and the orbital degeneracy is removed by a static Jahn-Teller distortion. The hyperfine interaction shows that the hole is localised on one of the four Te neighbours. The EPR spectrum of VTe+ reveals cubic (unperturbed) symmetry and the hyperfine structure shows that the unpaired electron is equally spread over the four Cd neighboursPhoto-EPR measurements locate the 0/+ state of VTe at Ev + 0.2 eV and the 2-/- acceptor level of VCd to be situated less than 0.47 eV above the valence band.

scholarly journals Sclerotia of the acellular (true) slime mould Fuligo septica as a model to study melanization and anabiosis

2008 ◽  
Vol 13 (1) ◽  
Author(s):  
Anna Krzywda ◽  
Elżbieta Petelenz ◽  
Dominika Michalczyk ◽  
Przemysław Płonka
Keyword(s):  
Water Balance ◽  
Model System ◽  
Paramagnetic Resonance ◽  
Slime Moulds ◽  
Oat Flour ◽  
Technical Simplicity ◽  
Electron Paramagnetic ◽  
Convenient Model

AbstractAcellular (true) slime moulds (Myxomycetes) are capable of a transition to the stage of sclerotium — a dormant form of plasmodium produced under unfavourable environmental conditions. In this study, sclerotia of Fuligo septica were analyzed by means of electron paramagnetic resonance (EPR) spectroscopy. The moulds were cultivated in vitro on filter paper, fed with oat flour, and kept until the plasmodia began to produce sclerotia. The obtained sclerotia differed in colour from yellow through orange to dark-brown. The EPR spectra revealed a free radical, melanin-like signal correlated with the depth of the colour; it was strongest in the dark sclerotia. Sclerotization only took place when the plasmodia were starved and very slowly dried. Only the yellow sclerotia were able to regenerate into viable plasmodia. This suggests that myxomycete cytoplasm dehydration is an active process regulated metabolically. Plasmodial sclerotization may therefore serve as a convenient model system to study the regulation of cytoplasmatic water balance, and sclerotia as a convenient material for EPR measurements, combining the quality of plasmodia with the technical simplicity of the measurements characteristic of dry spores. Darkening of the sclerotia is most probably a pathological phenomenon connected with the impairment of water balance during sclerotization.

scholarly journals Analisis Pengelolaan Dana Bantuan Operasional Sekolah (BOS) pada Satuan Pendidikan Dasar di Kota Kotamobagu

2017 ◽  
Vol 8 (2) ◽  
Author(s):  
Julianti Pontoh ◽  
Ventje Ilat ◽  
Hendrik Manossoh
Keyword(s):  
Human Resources ◽  
Central Government ◽  
Analysis Data ◽  
Point Of View ◽  
Exploratory Research ◽  
North Sulawesi ◽  
School Committee ◽  
Exploratory Approach ◽  
The City

Abstract. Indonesian Government has increased the quality of their education. One of their efforts is by providing School Operational Funding. However, there is a lack of supervision in managing the funding. BPK, BPKP, Inspectorate of North Sulawesi Province and the city of Kotamobagu had not yet conducted any audit on the fundings from 2012 to 2016. BPK has only monitored or controlled the funding whether they are genuinely transferred from central government to School Education Unit and to each school in City of Kotamobagu. From the supervising point of view, nor has School Committee implemented their supervising functions sufficiently. Therefore, this research is intended to investigate such phenomena. This is a qualitative exploratory research. Data were collected by in-depth interviews and document analysis. Data were validated by triangulations: researchers, theory and sources of data. Findings indicate that there are some constraints in managing BOS: supervision, human resources, communication and bureaucracy structure. Those four factors are crucial in relation to manage the funding complying with regulations.       Keywords:  School Operational Funding Management, Supervision, Human Resources, Communication and Bureaucracy StructureAbstrak. Pemerintah Republik Indonesia berusaha meningkatan pelayanan dan kualitas pendidikan dengan memberikan Bantuan Operasional Sekolah (BOS). Akan tetapi, kurangnya pengawasan dalam pengelolaan dana BOS di Kota Kotamobagu sangatnya tadi lapangan. BPK, BPKP, Inspektorat Propinsi Sulawesi Utara maupun Inspektorat Daerah Kota Kotamobagu belum melakukan audit terhadap pengelolaan dana BOS di Kota Kotamobagu dari tahun 2012 sampai tahun 2016. Selama ini BPK tidak melakukan audit tapi hanya sekedar mengontrol atau memonitoring apakah dana BOS yang disalurkan dari pusat telah diterima oleh Satuan Pendidikan Dasar di Kota Kotamobagu sesuai dengan dana yang ditransferkan ke rekening masing-masing sekolah. Dari segi pengawasan masyarakat, komite sekolah yang seharusnya menjalankan fungsi ini juga tidak melakukannya dengan baik. Oleh sebab itu, penelitian ini bertujuan untuk menganalisis fenomena yang terjadi. Penelitian ini menggunakan metode penelitian kualitatif dengan pendekatan eksploratori (exploratory approach). Data diperoleh melalui wawancara mendalam (indepth interviews), dan dokumentasi (documentation). Sedangkan validitas data yang digunakan adalah triangulasi peneliti, triangulasi teori, dan triangulasi sumber data.Hasil analisis dan pembahasan menyimpulkan bahwa terjadi beberapa hambatan dalam pengelolaan dana BOS. Hambatan-hambatan tersebut adalah masalah-masalah yang terjadi karena pengawasan, sumber daya, komunikasi dan struktur birokrasi. Keempat hal tersebut sangat penting dalam hubungannya dengan pengelolaan dana BOS agar pelaksanannya sesuai dengan regulasi yang ada.Kata Kunci: Pengelolaan Dana BOS, Pengawasan, Sumber Daya, Komunikasi dan Struktur Birokrasi

scholarly journals Preparation, Investigation and the Study of the Effect of Mn(II) Complex of Catechol and 2-Aminopyridine on Seed Germination

2011 ◽  
Vol 8 (1) ◽  
pp. 19-24
Author(s):  
F. I. El-Moshaty ◽  
R. S. El-Zweay ◽  
M. M. El-Ajaily ◽  
A. M. Jerboa
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Thermogravimetric Analysis ◽  
Seed Germination ◽  
Spectral Data ◽  
Root Length ◽  
Analysis Data ◽  
Molar Conductance ◽  
Conductance Measurement ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The formation of mixed ligand complex of Mn(II) with catechol (L1) and 2-aminopyridine (L2) was determined by elemental analyses (C, H and N), molar conductance measurement, thermogravimetric analysis, infrared, electronic and electron paramagnetic resonance spectroscopies. The elemental analysis data show the formation of 1:1:1 [M: L1: L2] complex. The molar conductance measurement shows a non-electrolyte nature. The thermogravimetric analysis data of the complex display the existence of hydrated and coordinated water molecules. The infrared spectral data exhibit the coordination sites that are through -OH,-C=N and –NH2groups. The electronic spectral data display the electronic transitions of the ligands and suggest an octahedral structure for the complex. The electron paramagnetic resonance spectrum of the complex reveals the existence of paramagnetic phenomena and supports its geometrical structure. Seed germination and root length of grass were also assayed under the effect of MnCl2.4H2O, catechol, 2-aminopyridine and its complex. Mn(II) salt was the most effective on germination than its complex which possess the high test effect on root length, while the ligands are the least active of all.

scholarly journals Preparation, Characterization and Antibacterial Activity of Some Metal ion Complexes

2007 ◽  
Vol 4 (4) ◽  
pp. 461-466 ◽  
Author(s):  
M. M. El-Ajaily ◽  
F. A. Abdlseed ◽  
S. Ben-Gweirif
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Antibacterial Activity ◽  
Schiff Base ◽  
Thermogravimetric Analysis ◽  
Elemental Analysis ◽  
Geometrical Structure ◽  
Analysis Data ◽  
Molar Conductance ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The Schiff base complexes derived from Salicylaldehyde and o- pheneylenediamine have been prepared and characterized using several physical techniques, in terms; elemental analysis, molar conductance measurements, thermogravimetric analysis, magnetic moment measurements, infrared, electronic and electron paramagnetic resonance spectra. The elemental analysis data exhibit the formation of 1:1[M: L] complexes. The molar conductance values reveal a non- electrolytic nature. The thermogravimetric analysis data of Cr(VI) complex show the presence of water molecules. The obtained magnetic moment values exhibit the existence of three unpaired electrons in the Cr(III) complex and a diamagnetic phenomenon for the other three complexes. The infrared spectral data display the coordination behavior of the Schiff base towards Cr(VI), Cr(III), Pb(II)) and TiO(IV) ions. The electronic absorption spectra of the Schiff base and its complexes show π→π* (phenyl ring), n→π* (HC=N) and the expected geometrical structure for the prepared complexes. The electron paramagnetic resonance spectral data satisfy the presence of a paramagnetic phenomenon and support the expected geometrical structure of Cr(III) complex. The Schiff base and its new complexes were tested for antibacterial activity against gram positive bacteria; Staphylococcus aureus and gram negative bacteria; Salmonella, Escherichia coli including the resistance bacteria Pseudomonas aeruginosa.

scholarly journals Mineralogical Insights to Identify Göktepe Marble in the Sculptural Program of Quinta Das Longas Villa (Lusitania)

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1194
Author(s):  
M. Pilar Lapuente Mercadal ◽  
Trinidad Nogales-Basarrate ◽  
Antonio Carvalho
Keyword(s):  
Analytical Techniques ◽  
White Marble ◽  
Paramagnetic Resonance ◽  
Fine Grained ◽  
Roman Villa ◽  
Multi Method Approach ◽  
High Level ◽  
Electron Paramagnetic ◽  
Method Approach

This archaeometric study is focused on the marble used in a group of fragmented sculptures found at the Roman villa of Quinta das Longas (Elvas, Portugal). Dating from the 4th century AD, the pieces are of remarkable quality and correspond to ideal and mythological figures from several iconographic cycles. The numerous fragments, all of very fine-grained white marble, are associated with the ornamentation of an impressive nymphaeum of the villa. Their high level of sculpture technique and style, the models followed and their similar typology to other well-known parallels raise the hypothesis of being linked with Aphrodisian workshops. Using a well-established multi-method approach, with Optical microscopy, X-ray Powder Diffraction (XRPD), qualitative and quantitative cathodoluminescence (CL) by CL-Optical and CL-SEM, and stable C and O isotopic and trace element analytical techniques (IRMS and ICP-AES), together with complementary parameters obtained from electron paramagnetic resonance (EPR) and 87Sr/86Sr isotopes, the marble provenance can be identified with certainty. The results all point to the best quality of white Göktepe marble, confirming the stylistic connection to the ancient Carian sculptors.

Quality of Bulk Cdte Substrates and Its Relation to Intrinsic Defects

1993 ◽  
Vol 302 ◽  
Author(s):  
B. K. Meyer ◽  
D. M. Hofmann ◽  
W. Stadler ◽  
P. Emanuelsson ◽  
P. Omling ◽  
...  
Keyword(s):  
Negative Charge ◽  
Acceptor Level ◽  
Dangling Bond ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Electron Paramagnetic ◽  
Jahn Teller Distortion

ABSTRACTBoth the cadmium vacancy (Vcd) and the tellurium vacancy (VTe) in CdTe are identified by means of electron paramagnetic resonance (EPR). The VCd is a double acceptor and the EPR spectrum is observed in its single negative charge state. The symmetry is found to be trigonal, which can be explained in a model in which the hole occupies a dangling bond t2 orbital and the orbital degeneracy is removed by a static Jahn-Teller distortion. The hyperfine interaction shows that the hole is localised on one of the four Te neighbours. The EPR spectrum of VTe+ reveals cubic (unperturbed) symmetry and the hyperfine structure shows that the unpaired electron is equally spread over the four Cd neighbours.Photo-EPR measurements locate the 0/+ state of VTe at Ev + 0.2 eV and the 2−/− acceptor level of VCd to be situated less than 0.47 eV above the valence band.

scholarly journals Peran Narapidana Sebagai Pembangkit Sikap Empati Penghuni Penjara

Integralistik ◽  
2019 ◽  
Vol 30 (2) ◽  
pp. 113-122
Author(s):  
Hascaryo Pramudibyanto
Keyword(s):  
Descriptive Analysis ◽  
Analysis Data ◽  
Point Of View ◽  
Home School ◽  
Social Environments ◽  
High Demand ◽  
Inner Pressure ◽  
The Family ◽  
The Relationship

A person's status as a prisoner or prisoner has a new problem for them and their families that they leave, because not all problems can be resolved from outside the prison because the involvement of prisoners in the family is still needed. High demand for the necessities of life increases the inner pressure of the family when interacting with home, school, and other social environments in the form of expressions, awards, and conclusions that are not always true. This study is intended to determine the relationship between crime and the quality of prisoners' empathy from the point of view of compassion towards family members, as well as how prisoners express empathy for families. The method used is qualitative to obtain descriptive analysis data about phenomena, events, social activities, attitudes, beliefs, perceptions, individual thoughts, and groups about the empathy of prisoners. The results obtained are, the prisoner's ability to generate empathy for other prisoners does not depend on age and age, the prisoner's ability to establish communication with good persuasion, being an example for other prisoners, there must be a collection of books or other. Unprinted material on empirical and suggestive matters, and prisons are examples of ways to improve the quality of one's empathy.Status seseorang sebagai tahanan atau narapidana memiliki masalah baru bagi mereka dan keluarga mereka yang mereka tinggalkan, karena tidak semua masalah bisa diselesaikan dari luar penjara karena keterlibatan napi dalam keluarga masih diperlukan. Permintaan yang tinggi akan kebutuhan hidup meningkatkan tekanan batin keluarga ketika berinteraksi dengan rumah, sekolah, dan lingkungan sosial lainnya dalam bentuk ekspresi, penghargaan, dan kesimpulan yang tidak selalu benar. Penelitian ini dimaksudkan untuk mengetahui hubungan antara kejahatan terhadap kualitas sikap empati narapidana dilihat dari sudut pandang kasih sayang terhadap anggota keluarga, serta cara narapidana mengekspresikan empati terhadap keluarga. Metode yang digunakan adalah kualitatif untuk memperoleh data analisis deskriptif tentang fenomena, peristiwa, kegiatan sosial, sikap, kepercayaan, persepsi, pemikiran individu, dan kelompok tentang sikap empati tahanan. Hasil yang diperoleh adalah, kemampuan napi untuk menghasilkan empati bagi napi lain tidak tergantung pada usia dan usia, kemampuan napi untuk menjalin komunikasi dengan persuasi yang baik, menjadi contoh bagi napi lain, harus ada koleksi buku atau lainnya. materi yang tidak dicetak tentang hal-hal empiris dan sugestif, serta penjara adalah contoh cara meningkatkan kualitas empati seseorang.

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