Log in

Relevant bibliographies by topics / Lantanidi / Journal articles

To see the other types of publications on this topic, follow the link: Lantanidi.

Journal articles on the topic 'Lantanidi'

Author: Grafiati

Published: 22 February 2023

Last updated: 14 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 38 journal articles for your research on the topic 'Lantanidi.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Vodyanitskii, Yu N., and O. B. Rogova. "The Biogeochemistry of Lantanides in Soils." Dokuchaev Soil Bulletin, no. 84 (July 1, 2016): 101–18. http://dx.doi.org/10.19047/0136-1694-2016-84-101-118.

Full text

Abstract:

The lithogenous minerals containing lantanides (Ln) are unsustainable within the zone of hypergenesis. Their dilution impoverish soils in terms of lantanides content, especially in humid regions. In conditions of neutral environmental pH in dry steppe zone, the lantanides loose their mobility, and, hence, become unavailable for plants. The lantanides are characterized by the high biochemical and biological activity. The physiologic impact of lantanides on plants is set. The separate parts of vascular plants accumulate lantanides in different degree. The difference may reach 100-fold level. For many plants the accumulation of lantanides occurs at the reverse order: roots > leaves > stalks > grain/fruits. Lantanides accumulators (such as brackens), promote their accumulation within the humus layer of soils. Fertilizers with lantanides are widely implemented in China. They powder seeds and implement top dressing in soils with lantanides deficit, i.e., with low bulk content and/or with low availability for plants. Although at moderate increasing of Ln concentration in solution, there is often observed the increasing of the crop yield in laboratory conditions. However, the implementation of lantanides in the soil does not always give the positive effect. The main share of Ln in the soils with high sorption capacity is sorbed, and the increasing of doses leads to the decrease of the yield. The light lantanides are characterized by physical and chemical properties equal to Cа2+. And the mass replacement of Cа2+ by lantanides harms the development of plants. The high doses of lantanides have a negative impact on the biochemical processes in plants. The competition with iron and phosphorus is stipulated by the close solubility of iron and lanthanum phosphates: the accumulation of La in plants tissues affects the content of P and Fe within them.

APA, Harvard, Vancouver, ISO, and other styles

2

Belkessam, M., M. Barhoumi, and M. Benattia. "Lantanier Lantana camara (Verbenaceae)." Phytothérapie 17, no. 4 (August 2019): 218–23. http://dx.doi.org/10.3166/phyto-2019-0186.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Setiawan, Ely, and Agustino Zulys. "STUDI TEORITIS STRUKTUR DAN SPEKTRUM ELEKTRONIK KOMPLEKS [Ln(pytpy)(NO3)3] SECARA KOMPUTASI METODE SPARKLE/RM1." Molekul 10, no. 1 (May 1, 2015): 19. http://dx.doi.org/10.20884/1.jm.2015.10.1.168.

Full text

Abstract:

Telah dilakukan penelitian tentang studi teoritis struktur dan spektrum elektronik kompleks [Ln(pytpy)(NO3)3] (Ln=Eu, Tb, pytpy=4’-(2-pyrrolyl)-2,2’:6’,2”-terpyridine) menggunakan metode komputasi semiempiris Sparkle/RM1. Metode Sparkle/RM1 ini dapat digunakan untuk memperoleh struktur geometri paling stabil dan parameter struktur dalam keadaan gas sebagai simulasi metode eksperimen yang mungkin terlalu mahal. Perhitungan spektrum elektronik dilakukan dengan ZINDO/S, dengan mengganti sparkle dengan titik muatan +3 pada koordinat yang dihasilkan melalui Sparkle/RM1. Hasil penelitian menunjukkan bahwa ion lantanida pada kompleks [Ln(pytpy)(NO3)3] memiliki bilangan koordinasi 9, yang berikatan dengan satu ligan tridentat pytpy dan tiga gugus nitrat sebagai ligan bidentat. Panjang ikatan rata-rata ion lantanida dengan atom N pada ligan pytpy adalah 2,541 Å dan 5,14 Å untuk Eu3+ dan Tb3+. Studi teoritis spektroskopi menunjukkan bahwa metode Sparkle/RM1 cukup akurat dalam memprediksi spektrum IR ligan pytpy, kompleks [Eu(pytpy)(NO3)3] maupun [Tb(pytpy)(NO3)3]. Spektrum UV-Vis kompleks [Eu(pytpy)(NO3)3] dan [Tb(pytpy)(NO3)3] memiliki intensitas serapan yang lebih kuat dan absorbansi yang lebih besar dari spektrum UV-Vis ligan pytpy.

APA, Harvard, Vancouver, ISO, and other styles

4

Khaldun, Ibnu, Zulfadli Zulfadli, and Cut Rizka Ramadhana. "PENGEMBANGAN MEDIA PEMBELAJARAN PROGRAM SIMULASI EKSTRAKSI PELARUT DAN SPEKTROFOTOMETRI UV-VIS PADA LOGAM LANTANIDA MENGGUNAKAN EKSTRAKTAN 1-PHENYL-3-METHYL-4-BENZOYL-5-PYRAZOLONE BERBASIS MICROSOFT EXCEL." Chimica Didactica Acta 10, no. 2 (December 31, 2022): 60–64. http://dx.doi.org/10.24815/jcd.v10i2.28118.

Full text

Abstract:

Penelitian ini bertujuan untuk mengembangkan media pembelajaran program simulasi ekstraksi pelarut dan spektrofotometri UV-Vis pada logam lantanida menggunakan ekstraktan 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone berbasis Microsoft Excel, serta menguji kelayakan dan tanggapan mahasiswa terhadap media yang dikembangkan. Jenis penelitian yang digunakan adalah penelitian dan pengembangan (RD), dengan tujuh langkah yaitu; (1) potensi dan masalah, (2) pengumpulan data, (3) desain produk, (4) validasi desain, (5) revisi desain, (6) uji coba produk, dan (7) revisi produk. Instrumen penilaian terdiri dari angket kelayakan media, angket tanggapan mahasiswa dan angket system usability scale (SUS). Penelitian dilakukan kepada 25 orang mahasiswa Jurusan Pendidikan Kimia Fakultas Keguruan dan Ilmu Pendidikan Universitas Syiah Kuala. Media yang diuji coba kepada mahasiswa telah divalidasi oleh validator dengan persen kelayakan sebesar 85,00% dan kategori sangat layak. Respons mahasiswa terhadap media ini sangat baik dengan rata-rata 88,35%, dan skor SUS yang didapat sebesar 85,30 dengan kategori dapat diterima, artinya program simulasi berbasis Microsoft Excel ini dapat digunakan untuk mensimulasi praktikum mengenai ekstraksi pelarut dan spektrofotometri UV-Vis pada logam lantanida menggunakan ekstraktan 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone.

APA, Harvard, Vancouver, ISO, and other styles

5

Singhal, Preeti, Renuka Jain, and Deepti Goyal. "ELECTRONIC SPECTRAL CHARACTERIZATION AND ANTIBACTERIAL ACTIVITY OF LANTHANIDE (III) - CEFTAZIDIME COMPLEXES." International Journal of Engineering Technologies and Management Research 5, no. 2 (February 8, 2020): 57–65. http://dx.doi.org/10.29121/ijetmr.v5.i2.2018.146.

Full text

Abstract:

The present work describes the spectrochemical study of some Lanthanide (III) - ceftazidime (Ln(III)-CEFZ) complexes. The impact of the ligand environment on electronic spectrum of the lantanide ion with special reference to complexation and nature of Ln-ligand bond has been examined. The energy and intensity parameters for the complexes have also been evaluated. The ligand and all prepared complexes were screened for their antibacterial activities against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus and the results showed that antibacterial activity of ligand on complexation have been enhanced.

APA, Harvard, Vancouver, ISO, and other styles

6

Assoudi, Nadia, W. Hzez, R. Dhahri, I. Walha, H. Rahmouni, K. Khirouni, and E. Dhahri. "Physical properties of Ag/Ca doped Lantanium manganite." Journal of Materials Science: Materials in Electronics 29, no. 23 (October 9, 2018): 20113–21. http://dx.doi.org/10.1007/s10854-018-0143-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Delgado-Altamirano, Ronna, Rosa López-Palma, Lianet Monzote, José Delgado-Domínguez, Ingeborg Becker, José Rivero-Cruz, Nuria Esturau-Escofet, Pedro Vázquez-Landaverde, and Alejandra Rojas-Molina. "Chemical Constituents with Leishmanicidal Activity from a Pink-Yellow Cultivar of Lantana camara var. aculeata (L.) Collected in Central Mexico." International Journal of Molecular Sciences 20, no. 4 (February 18, 2019): 872. http://dx.doi.org/10.3390/ijms20040872.

Full text

Abstract:

Lantana camara (L.) is employed by several ethnical groups to treat numerous diseases. Although there are no ethnomedical reports on its use against leishmaniasis, organic extracts prepared from L. camara were shown to display leishmanicidal activity. In the present study, we carried out a bioassay-guided fractionation of the dichloromethane extract from Mexican L. camara in order to identify the compounds responsible for the leishmanicidal activity. Eighteen chromatographic fractions (FI–FXVIII) were evaluated in vitro against Leishmania mexicana and L. amazonensis. FII, FX, FXI, FXV, and FXVI showed significant activity against both Leishmania strains, the most potent of which was FXV. Eicosane (1), squalene (2), β-ionone (3), caryophyllene oxide (4), β-caryophyllene (5), hexanoic acid (6), tiglic acid (7), a mixture of lantanilic (8) and camaric (9) acids, and lantadene B (10) were identified and obtained from the active fractions and evaluated for their leishmanicidal activity. The mixture of lantanilic (8) and camaric (9) acids (79%/21%) was the most potent one (half maximal inhibitory concentration (IC50) = 12.02 ± 0.36 μM). This study indicates that this cultivar of L. camara has high potential for the development of phytomedicines or as a source of natural products, which might represent lead compounds for the design of new drugs against leishmaniasis.

APA, Harvard, Vancouver, ISO, and other styles

8

MELO, Roseane Maria de, Francisco José Santos LIMA, Ademir Oliveira da SILVA, and Cláudio César de Medeiros BRAGA. "SYNTHESIS AND CHARACTERIZATION OF LANTANIUM, NEODYMIUM AND ERBIUM MALEATES." Periódico Tchê Química 06, no. 11 (January 20, 2009): 31–42. http://dx.doi.org/10.52571/ptq.v6.n11.2009.32_periodico11_pgs_31_42.pdf.

Full text

Abstract:

The lanthanium, neodymium and erbium maleates, were prepared starting from the oxides with hydrochloric acid for the formation of the salts, both in aqueous suspension, and after recrystallizade and dry, acid maleic was added. The obtained compositions were studied through the with EDTA complexometry, molar conductance thermogravimetry (TG), infrared spectroscopy, rays-X difratometry for the method of the powder and molecular modelling. The curves TG were obtained in atmosphere of synthetic air. The results made possible to establish the stochiometry and the degree of hydration of the compositions, that presented general formula: M(Mal)x.nH2O. The curves TG also allowed to verify the thermal stability, as well as the process of thermal decomposition, of these composed. The rays-X diffraction, for the method powder, showed that all the compositions possess crystalline structure, however, without formation of series isomorphous.

APA, Harvard, Vancouver, ISO, and other styles

9

Nadirbekov, M. S., and O. A. Bozarov. "Nonaxial shapes of even–even lantanide and actinide nuclei in excited collective states." Physics of Atomic Nuclei 79, no. 4 (July 2016): 461–68. http://dx.doi.org/10.1134/s1063778816030121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Raos, Nenad. "Specijalna teorija relativnosti u kemiji." Kemija u industriji 69, no. 11-12 (2020): 659–64. http://dx.doi.org/10.15255/kui.2019.013.

Full text

Abstract:

Primjena specijalne teorije relativnosti u kemiji nije česta; potreba za njom javlja se tek pri proračunu svojstava teških atoma, u kojima se elektroni gibaju relativističkim brzinama. U članku su dati primjeri objašnjenja osebujne boje zlata, niskog tališta žive, boje bizmutovih i olovnih spojeva, utjecaja relativističke korekcije na proračun oblika klastera zlata, duljine veza u spojevima 11. skupine i lantanoida te napona olovnog akumulatora i baterije Zn/HgO. Usto su prikazane osnove specijalne teorije relativnosti i kvantne kemije.

APA, Harvard, Vancouver, ISO, and other styles

11

Ruiz-Gonzalez, L., R. Cortes-Gil, J. M. Alonso, and J. M. Gonzalez-Calbet. "Long and Short Ordering in Cationic Deficient Manganese Related Brownmillerites." Microscopy and Microanalysis 18, S5 (August 2012): 69–70. http://dx.doi.org/10.1017/s1431927612013001.

Full text

Abstract:

Ever since colossal magnetoresistance (CMR) was discovered in Ln1-xAExMnO3 (Ln=lantanide; AE alkaline-earth), establishing the relationship between structure and properties constitutes a prominent place in the landscape of solid-state science because of its intriguing potential applications. The occurrence of different Mn3+/Mn4+ ratios seems to be responsible of the different magnetic behaviours observed and can be tuned by either changing i) the Ln/AE ratio or ii) the oxygen content, i.e., Ln1-xAExMnO3-δ. Although plenty of works has been devoted to the first point, less effort has been devoted to study the effect of the compositional variations at the oxygen sublattice. In spite of the partial break-up occurring at the 3D network of octahedral sharing corners, responsible of the double exchange interactions the oxygen deficient compounds exhibits complex magnetic and electric properties.

APA, Harvard, Vancouver, ISO, and other styles

12

Riskiana, Dewi Nur, Mukhtar Effendi, Ariyawan Sunardi, Mochamad Imron, and Abdul Aziz Rohman Hakim. "PERHITUNGAN PRODUKSI 177Lu BERDASARKAN VARIASI WAKTU IRADIASI DI REAKTOR RSG-GAS MENGGUNAKAN PROGRAM ORIGEN 2.1." Reaktor : Buletin Pengelolaan Reaktor Nuklir 18, no. 1 (May 6, 2021): 27. http://dx.doi.org/10.17146/bprn.2021.18.1.6281.

Full text

Abstract:

Telah dilakukan perhitungan radioaktivitas 177Lu (Lutetium-177) dengan variasi waktu iradiasi di Reaktor RSG-GAS. 177Lu merupakan radioisotop golongan lantanida yang sekarang banyak digunakan sebagai agen radioterapi kanker. Perhitungan ini menggunakan paket program ORIGEN 2.1 dengan memasukkan data inputan seperti fluks neutron (1 x 104 n/m2 s), massa lutetium oksida (3 miligram) dan lama iradiasi (4 hari,8 hari, dan 12 hari). Dalam penentuan massa lutetium dibedakan menjadi dua komponen yaitu massa 176Lu dan 175Lu yang berturut-turut sebesar 2 miligram dan 0,6 miligram. Perhitungan tersebut menghasilkan radioaktivitas produksi 177Lu tertinggi sebesar 30,939 GBq pada 12 hari iradiasi. Sedangkan, radioaktivitas produksi 177Lu terendah sebesar 15,939 GBq pada 4 hari iradiasi. Dari hasil tersebut, radioaktivitas produksi 177Lu dengan lama iradiasi mempunyai hubungan lininer. Kemudian radioaktivitas produksi 177Lu untuk melebihi 20 GBq dapat dimulai dari 8 hari iradiasi. Adapun radioaktivitas peluruhan 177Lu dengan waktu peluruhannya memiliki hubungan yang berbanding terbalik.

APA, Harvard, Vancouver, ISO, and other styles

13

Shamsutdinova, M., and F. Dzhebirkhanova. "COMPLEX COMPOUNDS OF LANTANOIDS WITH 4 - [(2,4-DIMETOXYBENZYL) AMINO] BENZOIC ACID." National Association of Scientists 2, no. 68 (July 1, 2021): 57–60. http://dx.doi.org/10.31618/nas.2413-5291.2021.2.68.454.

Full text

Abstract:

The synthesis of complex compounds of 4 - [(2,4-dimethoxybenzyl) amino] benzoic acid (HL) with ions of samarium (III), europium (III), terbium (III), gadolinium (III) and dysprosium (III). According to the data of elemental analysis and thermogravimetry, the obtained complexes are hydrates of the composition LnL3 · nH2O, where n = 0-2. The area of their thermal stability is in the range from 100 ° С to 150 ° С. Electronic and infrared absorption spectra of the ligand and complexes with rare-earth metal ions have been measured. According to the IR spectra, the coordination of the ligand with the metal ion occurs at the carboxyl group. The carboxyl group is bidentate coordinated. To excite luminescence, a line of a mercury lamp with a wavelength of 248 nm was used. The highest luminescence intensity is observed for the coordination compounds Eu3 +, Tb3 +, Sm3 +, and Dy3 +.

APA, Harvard, Vancouver, ISO, and other styles

14

Kim, Jin Soo, Min Su Jang, Ill Won Kim, and Kwang Sei Lee. "Niobium doping effects and ferroelectric relaxor behavior of bismuth lantanium titanate." Journal of Electroceramics 17, no. 2-4 (December 2006): 129–33. http://dx.doi.org/10.1007/s10832-006-5410-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Strugatska, M., I. Olyshevets, V. Ovchynnikov, and V. Amirkhanov. "SYNTHESIS AND SPECTRAL PROPERTIES OF LANTANIDE COMPLEXES WITH A NEW TRIPODAL TRIS-CHELATING CAPh LIGAND." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 1(55) (2018): 35–39. http://dx.doi.org/10.17721/1728-2209.2018.1(55).8.

Full text

Abstract:

A new tripodal tris-chelating carbacylamidophosphate (CAPh) ligand (H3L = N(CH2CH2N(H)C(O)N(H)P(O)(OCH3)2)3) has been synthesized and a series of coordination compounds of general formula LnL (where Ln = La, Nd, Eu, Tb) based on this ligand has been obtained and isolated in the crystalline state. The resulting compounds have been investigated by the means of thermal gravimetric analysis, 1H NMR, IR and UV-Vis absorption spectroscopy. The ligand and all complexes are soluble in water, poorly soluble in methanol and isopropanol, insoluble in nonpolar solvents. It was found, that each Ln(III) ion of the complexes under consideration is bonded with oxygen atoms belonging to the phosphoryl and carboxyl groups of three bidentate chelated coordinating arms of the ligand (six lanthanide-oxygen bonds totally). In the 1H NMR spectrum of lanthanum coordination compound (LnL) all signals are shifted in the region of a strong field compared to analogous signals in the respective H3L spectrum, which can be explained by the redistribution of electronic density in the ligand due to deprotonation. The fine structure of the supersensitive transitions in the electronic spectrum of the synthesized neodymium complex proves in favor of the coordination number 8. In the region of 4I9/2 → 2P1/2 transition (425–435 nm) a single absorption band is observed, indicating the presence of only one absorption center. The thermal stability of NdL complex has been investigated and the presence of two coordinated water molecules in the synthesized complexes has been established. Thus, coordination number of lanthanide ions is equal to eight (coordination formula [LnL(H2O)2]) which is in agreement with electronic spectroscopy results. Based on the data of the TGA for the coordination compound [NdL(H2O)2] one can conclude that significant mass loss occurs in one step. The complex compound begins to decompose above 200°C. Considerable mass loss continues to a temperature of 380–400°С. The DTA curve shows an exothermic effect at a temperature of 287°C, which can be connected with the oxidation processes.

APA, Harvard, Vancouver, ISO, and other styles

16

Kashurin, R., S. Gerasev, and A. Suslov. "Study of the Solubility of Sediments of Certain Lantanoids in Carbonate Solutions." Bulletin of the South Ural State University series "Chemistry" 12, no. 4 (2020): 63–71. http://dx.doi.org/10.14529/chem200403.

Full text

Abstract:

The study examines the dissolution process for the precipitates of the rare-earth carbonates and phosphates with a change in the concentration parameters of the system. The objective of the study is to determine the nature of the dissolution process at variable composition of the studied solutions. As a result of the theoretical base analysis, the qualitative and quantitative content of rare-earth metals in red sludge and phosphogypsum is presented, which governs the interest in this problem under consideration. The available techniques for extraction of rare-earth metals from red sludge and phosphogypsum have also been considered, their advantages and disadvantages are presented. A promising carbonate-alkali method for the extraction of rare-earth metals has been considered. Thermodynamic parameters of the system have been calculated to determine the possibility of the process. During the experiment the factors affecting the dissolution process have been examined: the carbonate ion concentration, the nature of the solvent cation and rare-earth metal cation. Carbonates and phosphates of europium, holmium, and neodymium have been considered as the analyzed components. Carbonates and phosphates of neodymium, europium, and holmium have been dissolved in model solutions of K2CO3 with the concentrations of 0.2–4.5 mol/L until reaching equilibrium. The obtained results show the dependence of solubility of the precipitates of rare-earth metals on the solvent nature and concentration. The explored data are presented as solubility isotherms. On the basis of experimental data the values of the extraction degree of a rare-earth metal into the solution have been calculated. For neodymium, europium, and holmium carbonates, the maximum recovery degree αmax is 72.8 %, 81.2 %, 83.0 %, respectively. During the experiment with dissolution of lanthanide phosphates, the following results have been obtained: the maximal degree of neodymium extraction is 60.59%, while for europium it equals 51.66 % and 93.01 % for holmium

APA, Harvard, Vancouver, ISO, and other styles

17

Lysenko, A. B., T. V. Kalinina, K. P. Shuleshova, and V. R. Brusentsov. "THE INFLUENCE OF THE COMPOSITION ON AMORPHIC ALLOYS THERMAL STABILITY BASED ON LIGHT LANTANOIDS." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 2, no. 35 (December 26, 2019): 37–41. http://dx.doi.org/10.31319/2519-2884.35.2019.40.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Lee, Kee Sung, Tae Ho Shin, Shi Woo Lee, Sang Kuk Woo, Jae Kyo Yang, and Yong Ho Choa. "Surface Coating of Reactive Layer with Inner Nano-Pores on Lantanium Gallium Based Oxide." Materials Science Forum 486-487 (June 2005): 161–64. http://dx.doi.org/10.4028/www.scientific.net/msf.486-487.161.

Full text

Abstract:

A layer consisting of La0.6Sr0.4CoO3-d particles with inner nano-pores is coated on the La0.7Sr0.3Ga0.6Fe0.4O3-d oxide to improve the surface reaction resulting in high oxygen permeability. The La0.6Sr0.4CoO3-d particles with inner nano-pores are synthesized by an ultrasonic spray pyrolysis method. The permeated oxygen contents from air to helium gas were measured using gas chromatography after the synthesized particles were coated on the La0.7Sr0.3Ga0.6Fe0.4O3-d oxide by the conventional screen-printing. The results demonstrated that the reactive free surfaces of the nano-pores are an important factor in determining the oxygen permeation for application such as gas separation membrane and ceramic fuel cell.

APA, Harvard, Vancouver, ISO, and other styles

19

HALEFOĞLU, Yusuf Ziya. "Lantanit Element Katkılı Uzun Işımalı CaAl2O4 Fosforların Trafik Yol İşaret Çizgisi Olarak Kullanılabilirliğinin Araştırılması." Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi 32, no. 4 (December 15, 2017): 121–26. http://dx.doi.org/10.21605/cukurovaummfd.383190.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Sukhdolgor, J., and D. Orkhonselenge. "Biochemical Study of Mumijo in Uvs province, Mongolia." Mongolian Journal of Chemistry 12 (September 24, 2014): 56–59. http://dx.doi.org/10.5564/mjc.v12i0.173.

Full text

Abstract:

The authors cleared mumijo by extractive and distil methods, defined pure output of natural mumijo and compared difference between these two methods. We defined the amount of dry and extractive substances, raw oil, antioxidant-rutin, vitamin C, fulvic acid, common nitrogen and total protein, content of protein amino acids, and mineral elements in natural mumijo. We exposed 13 protein amino acids in sample of natural mumijo. The content of total irreplaceable amino acids (5) were 26.2%. The authors defined macro and microelements (42) in ash of natural mumijo. In sample of mumijo exposed 10 elements are oxide form, W, Y, Cs, La-rare metal of the earth, and actinoids- Nd, Th, U; lantanoids-Pr, Sm. The same exposed non-ferrous metal-Cu, Mo; light metal-Al, mixed metal-Pb, Zn. However, the valuable metals-Au, Ag and white gold are not exposed.DOI: http://dx.doi.org/10.5564/mjc.v12i0.173 Mongolian Journal of Chemistry Vol.12 2011: 56-59

APA, Harvard, Vancouver, ISO, and other styles

21

Babailov, Sergei P. "Nanodimentional Thermometric NMR Sensors on the Basis of Double-Decker Paramagnetic Lantanide(III) Complexes with Porphyrins for Solution Temperature Measurements." Macroheterocycles 3, no. 4 (2010): 218–21. http://dx.doi.org/10.6060/mhc2010.4.218.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Zhitlova, E. A., D. V. Burba, E. K. Laryukova, F. V. Shakirova, and F. A. Sunagatullin. "X-RAY CHARACTERISTICS OF BONE TISSUE DEFECT AFTER LOCAL INGECTION OF BIPHOSPHONATES AND IONS OF LANTANIDES." Scientific Notes Kazan Bauman State Academy of Veterinary Medicine 234, no. 2 (June 5, 2018): 104–8. http://dx.doi.org/10.31588/2413-4201-1883-234-2-104-108.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

SAWATARI, HIDEYUKI, TAKAAKI ASANO, XINCHENG HU, TOMOO SAIZUKA, and HIROKI HARAGUCHI. "SIMULTANEOUS MULTIELEMENT SEPARATION AND DETECTION OF LANTANOIDS BY LIQUID CHROMATOGRAPHY/INDUCT IVLELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY." Analytical Sciences 7, Supple (1991): 477–78. http://dx.doi.org/10.2116/analsci.7.supple_477.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Ismoilov, I. R., E. S. Dodkhoev, R. A. Ismoilov, S. Z. Nazhmudinov, and A. B. Badalov. "The Study of Regularities of Changing Melting Enthalpy of Intermetallides of Magnesium–Lantanoids Systems Rich in Magnesium." Mining science and technology 4, no. 2 (August 25, 2019): 111–21. http://dx.doi.org/10.17073/2500-0632-2019-2-111-121.

Full text

Abstract:

Providing a reasonable forecast of the required properties of intermetallic compounds (hereinafter also referred as intermetallides or IM) is an important scientific and commercial problem, which may be solved by focusing scientific researches and permanent generation of knowledge in this field. To date, researches in chemistry and physics of IM have been developing empirically for a simple reason, due to the complexity of describing the relationship between the crystal structure and chemical bonds, and, therefore, between all the properties of IM. IM is mainly characterized by metal type of chemical bond, as well as specific metallic properties. At the same time, among IM, there are also salt-like compounds with ionic bond, i.e. valency compounds formed from elements of different chemical nature, being stoichiometric compounds. The examples of such compounds are compounds with intermediate bond type, i.e. ionmetal and covalently-metal, as well as covalent bond types (e.g., NaAu). In the series of compounds of Mg with elements of the IV subgroup, along with decreasing the difference in the electrochemical characteristics of the components, the change in the IM properties is observed, from those peculiar to ionic compounds (for example, Mg2Si, Mg2Ge) to the properties typical of metals (Mg2Pb), etc. Due to the fact that lanthanides form the largest group of elements of the periodic system occurring in nature, and Mg is a relatively active chemical element in terms of IM formation (for example, it forms three IM with cadmium - Mg3Cd, MgCd and MgCd3), its oxides in slag provide decreasing average silicon content and increasing the stability of the silicon content in iron, being an important process indicator in the course of physicochemical reactions occurring in a blast furnace (for example, in the process of iron production). The presence of Si impurity (along with O, Au, Ti, V, Zr) produces the greatest effect on efficiency of solar cells, etc. [1–3]. Based on the foregoing, it is very important to study the state function, i.e. enthalpy of magnesium-lanthanide systems, rich in magnesium, and, based on the results of computer simulation, taking into account molecular dynamics method and other similar studies [4–8], to model regularities of changes in melting enthalpy of IM of the mentioned systems. The issue of modeling the pattern of change in melting enthalpy of IM of magnesium-lanthanide (Mg-Ln) magnesium-rich systems is considered based on systematic analyzing melting enthalpy of IM of Mg-Ln magnesium-rich system, including Mg2Ln, Mg3Ln and equimolar compound MgLn, implemented using semi-empirical method developed by N.S. Poluektov.

APA, Harvard, Vancouver, ISO, and other styles

25

Barrea, Raúl A., and Edgardo V. Bonzi. "Lantanides' Experimental L X-ray Fluorescence Cross Sections at 9 keV and 12 keV with Synchrotron Radiation." Physica Scripta 63, no. 3 (March 1, 2001): 197–202. http://dx.doi.org/10.1238/physica.regular.063a00197.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Delgado-Altamirano, Ronna, Alejandra Rojas, and Nuria Esturau-Escofet. "1 H and 13 C NMR reassignment of some chemical shifts of lantanilic acid and camaric acid." Magnetic Resonance in Chemistry 57, no. 6 (February 19, 2019): 320–25. http://dx.doi.org/10.1002/mrc.4839.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Ikhsanu, Pradiar, and Sigit Prastowo. "TOKSISITAS DAUN BIDURI (Calotropis gigantea) DAN DAUN TEMBELEKAN (Lantana camara L) TERHADAP KUTU KEBUL (Bemisia tabaci)." Berkala Ilmiah Pertanian 5, no. 1 (February 26, 2022): 28. http://dx.doi.org/10.19184/bip.v5i1.28830.

Full text

Abstract:

Hama merupakan organisme yang mampu membuat tanaman mengalami kerusakan. Salah satu hama yang menyerang tanaman adalah kutu kebul (Bemisia tabaci). Kutu kebul tergolong hama polifaq karena mampu menyerang banyak jenis tanaman dari berbagai famili.Tanaman yang terserang kutu kebul akan terdapat tanda bintik-bintik, menguning, lalu rontok. Upaya pengendalian yang bisa dilakukan dengan menggunkan pestisida nabati. Tembelekan mengandung bahan aktif senyawa alkoloid (Lantanine), flovonoid dan triterpenoid. Biduri mengandung bahan aktif saponin, flovonoid, polifenol, glukosida kalotropin, sedikit damar, alban dan fluavil. Cara kerja ekstrak daun biduri dan tembelekan adalah racun kontak. Data mortalitas hama kutu kebul dihitung dengan menggunakan analisis varian (ANOVA), untuk membedakan rerata antar perlakuan diuji dengan DMRT (Duncan Multiple Range Test) dengan taraf 5 %. Efektifitas ekstrak daun biduri dan daun tembelekan dihitung nilai LC50 dengan menggunakan analisis probit. Nilai mortalitas terbaik nya yaitu pada perlakuan P5 konsentrasi 15 % dengan lama pengamatan 48 jam menunjukkan mortalitas sebesar 80 % berbeda nyata dengan perlakuan lain. Mortalitas terbaik pada perlakuan P10 konsentrasi 15 % pada pengamatan 48 sebesar 90 % berbeda nyata dengan perlakuan lain. Nilai LC50 pada biduri dan tembelekan mortalitas terbaiknya pada konsentrasi 11,61 ml dan 6,51 ml membutuhkan waktu 12 jam untuk membunuh 50 % serangga uji.

APA, Harvard, Vancouver, ISO, and other styles

28

Vodianitsky, Yu, N. Kosareva, and A. Savichev. "LANTANIDES (Y, La, Ce, Pr, Nd, Sm) AND ACTINIDS (Th, U) IN SOILS OF THE HIBINO-LOVOZERO PROVINCE." Dokuchaev Soil Bulletin, no. 65 (June 30, 2010): 75–86. http://dx.doi.org/10.19047/0136-1694-2010-65-75-86.

Full text

Abstract:

In the Khibinsko-Lovozero district of the Kola Peninsula, the territory is divided into three geochemically different areas. In the background area near Umbozero, both mineral and peated samples contain all rare metals below clark: lanthanides and actinides are leaching heavily from acidic podzolic soils. В in the area of weak geochemical anomaly (near Lovozero), all lanthanides are inherited from the loparite-containing rock, and all actinides - Th: their content is 1.3-5.4 times higher than the clark value. In the zone of a strong geochemical anomaly (on the northern shore of Seidozero and on theThe concentration of lanthanides and actinides is even higher: 4-9 times higher than the clark value. There is an impact of a biological barrier that prevents excessive accumulation of of heavy metals in the mosses of a geochemical anomaly.

APA, Harvard, Vancouver, ISO, and other styles

29

Koptyaev, A. I., M. I. Bazanov, and N. E. Galanin. "Synthesis and Properties of Heteroligand Sandwich Complexes of Lantanides Containing 5-(Quinolin-2-yl)tetrabenzoporphyrin and Phthalocyanine Chromophores." Russian Journal of Organic Chemistry 56, no. 5 (May 2020): 788–96. http://dx.doi.org/10.1134/s1070428020050103.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Melnik, Milan, Ondrej Sprusansky, and Clive Holloway. "Crystallographic and structural characterization of heterometallic platinum compounds. Part II. Heterobinuclear Pt compounds with Pt⋯M (M = transition or lantanide metal) > 3.0 Å." Open Chemistry 10, no. 6 (December 1, 2012): 1709–59. http://dx.doi.org/10.2478/s11532-012-0094-2.

Full text

Abstract:

AbstractThis review covers almost two hundred and twenty heterobinuclear platinum compounds in which Pt⋯M separation is over 3.0 Å. The M is a transition metal (Cu, Ag, Au, Ti, V, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni and Pd). There is an example of a lanthanide, Yb and a actinide, U. The Pt atom has oxidation numbers 0, +2 and +4. The Pt coordination geometries include trigonal planar Pt(0); square planar Pt(II); trigonal bipyramidal, and pseudo octahedral Pt(IV), with the most frequent being square planar. The most common ligands for Pt are P and C donor atoms, as well as a chlorine atom. The Pt — Ag distance of 3.002(1) Å is the shortest found in this series. There are examples which contain two crystallographically independent molecules, which differ mostly by degree of distortion and even one unique example, which contains eight such molecules. These are examples of distortion isomerism. Factors affecting bond lengths and angles are discussed and some ambiguities in coordination polyhedral are outlined.

APA, Harvard, Vancouver, ISO, and other styles

31

Chamanova, M., Sh A. Akhmedov, Sh Z. Nazhmudinov, and A. Badalov. "ESTABLISHMENT OF REGULARITY OF CHANGES IN CHEMICAL CHARACTERISTICS OF INTERMETALLIDES OF ALUMINUM SYSTEMS - LANTANIDES OF COMPOUNDS Al11Ln3, β-Al11Ln3 AND Al3Ln." Mining science and technology, no. 2 (August 12, 2018): 42–50. http://dx.doi.org/10.17073/2500-0632-2018-2-42-48.

Full text

Abstract:

Ensuring the effective development of industries based on natural resources, taking into account the necessary qualitative scientific justification, balancing the reasonable level of scientific and technological progress, is justified by the creation of new materials with specified characteristics. For this, fundamental studies of the physico-chemical and thermodynamic properties of various systems, in particular intermetallides (MI), are an important applied problem. At present, the study of aluminum-based metal systems involving rare-earth metals becomes especially urgent. The problem of determining the regularities of the changes in the thermochemical characteristics of the IM aluminum-lanthanide systems of the α-Al11Ln3, β- Al11Ln3 and Al3Ln compositions is considered, by refining the values of the temperature and melting enthalpy using semiempirical and calculated methods that allow obtaining fairly complete characteristics on the temperature and enthalpy of melting of the IM compositions of the rich aluminum with a demand in modern technology.

APA, Harvard, Vancouver, ISO, and other styles

32

Bobrov, V., G. Leonova, and A. Maltsev. "RARE-EARTH ELEMENTS (LANTANOIDS) IN THE HOLOCENE SECTION OF SAPROPEL LAKE KOTOKEL (EASTERN PRE BAIKAL REGION) РАЗРЕЗЕ САПРОПЕЛЯ ОЗЕРА КОТОКЕЛЬ (ВОСТОЧНОЕ ПРИБАЙКАЛЬЕ)." Transbaikal State University Journal 25, no. 2 (2019): 4–16. http://dx.doi.org/10.21209/2227-9245-2019-25-2-4-16.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Bibik, Y., D. Khomenko, R. Doroschuk, and R. Lampeka. "THE SYNTHESIS OF TRIAZOLE CONTAINING ANALOGUES OF SALEN AND VANEN." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 2(54) (2017): 37–39. http://dx.doi.org/10.17721/1728-2209.2017.2(54).5.

Full text

Abstract:

Facile methods of the preparation of heterocyclic analogues of Salen and Vanen are reported. The azamethine fragments of Schiff bases were replaced by 1,2,4-triazoles. The method of synthesis described may afford to prepare the series of ligand systems with different substituents with high overall yields relatively to the hydrazide. Unlike Schiff's bases, all synthesized compounds are chemically stable and resistant to oxidizing and reducing agents. The molecules are entirely conjugate to the π-systems, which is likely to be reflected in the electronic properties of coordination compounds. Obtained ligand systems could maintain great interest in the synthesis of various transition metal coordination compounds. These could be concluded from the fact that coordination behavior of synthesized ligands is expected to be similar to that is observed for Salen an Vanen type ligands respectively. The resulting compounds have the same donor centers from Salen and Vanen, having a similar planar structure and coordination behavior. All ligands are tetradentate, may leave vacant positions in the coordination sphere of transition metals and form five- and six-membered cycles. The Vanen analogues are capable of forming binuclear complex compounds, since they have internal N2O2 (for coordination with 3d metal ions) and external O2O2 (for exo-coordination of ions of lantanides) donor centers. The compounds obtained are capable of forming coordination compounds with antibacterial, antifungal, anticancer, antioxidant, anti-inflammatory, antimalarial, antiviral activities and also as homogeneous and heterogeneous catalysts in polymerization, epoxidation, hydrosilylation reactions, sensors etc. The analogues were analyzed by NMR and IR spectroscopy.

APA, Harvard, Vancouver, ISO, and other styles

34

Meilinda, Handias, Novi Noviyanti, Anni Anggraeni, Diana Hendrati, and Husein H. Bahti. "Pengaruh Berbagai Parameter Ekstraksi dalam Pemisahan Unsur Tanah Jarang dengan Metode Emulsion Liquid Membrane (ELM)." ALCHEMY Jurnal Penelitian Kimia 17, no. 1 (March 8, 2021): 1. http://dx.doi.org/10.20961/alchemy.17.1.38683.1-9.

Full text

Abstract:

<p>Unsur Tanah Jarang (UTJ) adalah 15 elemen kelompok lantanida, ditambah skandium dan itrium yang termasuk kelompok aktinida. UTJ memiliki banyak manfaat di berbagai bidang. Sifat fisik dan kimia yang mirip antar UTJ membuatnya sulit dipisahkan sehingga pemisahan UTJ menarik dipelajari dengan berbagai macam metode, salah satunya adalah dengan menggunakan <em>Emulsion Liquid Membrane </em>(ELM). ELM merupakan metode pemisahan yang dikembangkan dari ekstraksi pelarut terdiri dari tiga fase, yaitu fase eksternal (fase umpan) yang berisi UTJ yang akan dipisahkan, fase internal (fase pengupasan), dan fase membran. Fase membran berisi surfaktan sebagai penstabil dan ligan yang akan membentuk kompleks dengan UTJ pada antarmuka fase umpan dan membawanya berdifusi ke dalam fase pengupasan. ELM merupakan metode efektif untuk pemisahan karena tahap ekstraksi dan pengupasan (<em>stripping</em>) terjadi secara bersamaan dalam satu tahap dan fase membrannya dapat digunakan kembali. Pemisahan UTJ menggunakan metode ELM dengan berbagai ligan, seperti D2EHPA, Cyanex 572, P204, dan (RO)2P(O)OPh-COOH dipengaruhi oleh berbagai parameter, seperti konsentrasi ligan, pH fase umpan, waktu pengadukan ekstraksi, kecepatan pengadukan ekstraksi, rasio fase umpan, konsentrasi fase pengupasan, konsentrasi surfaktan, dan konsentrasi fase umpan. Parameter tersebut diseleksi untuk mendapatkan kondisi optimum sehingga meningkatkan efisiensi ekstraksi dan pengupasan yang berbeda.</p><p><strong>Effect of Various Parameters in Separation of Rare Earth Elements using the Emulsion Liquid Membrane (ELM) Method. </strong>Rare Earth Elements (REEs) are 15 elements of the lanthanide group, plus scandium and yttrium, which belong to the actinide group. REEs have many benefits in various fields. Similar physical and chemical properties between REEs make it difficult to separate, thus REEs separation is interesting to study by various methods, one of which is by using an emulsion liquid membrane (ELM). ELM is a method developed from solvent extraction consisting of three phases: the external phase (feed phase) which contains REEs to be collected, the internal phase (stripping phase), and the membrane phase. The membrane phase contains surfactants as stabilizers and ligands which will form complexes with REEs in the feed phase and are designed to diffuse into the stripping phase. ELM is an effective method to involve because extraction and stripping occur together in one glass and the membrane phase can be reused. Separation of REEs using the ELM method with various ligands, such as D2EHPA, Cyanex 572, P204, and (RO)2P(O)OPh-COOH influenced by various parameters, such as ligand concentration, feed phase pH, extraction stirring time, extraction stirring speed, feed phase ratio, stripping phase concentration, surfactant concentration, and feed phase concentration. These parameters are selected to obtain optimum conditions thereby increasing the efficiency of different extraction and stripping.</p><p> </p>

APA, Harvard, Vancouver, ISO, and other styles

35

Andrade, Bruna Antonia Ferreira de, Zildo Maia de Vasconcelos, Alana Késsia Lopes Araújo, and Fábio Henrique Silva Sales. "ANÁLISE DOS EFEITOS DA ADIÇÃO DE ALUMINA (AL2O3), ÓXIDO DE ZINCO (ZNO) E ÓXIDO DE LANTÂNIO (LA2O3) NAS PROPRIEDADES MECÂNICAS DA CERÂMICA DE ARGILA / ANALYSIS OF THE EFFECTS OF ADDING ALUMINIUM (AL2O3), ZINC OXIDE (ZNO) AND LANTANIUM OXIDE (LA2O3) ON THE MECHANICAL PROPERTIES OF ARGYL CERAMICS." Brazilian Journal of Development 7, no. 3 (2021): 24122–30. http://dx.doi.org/10.34117/bjdv7n3-221.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Hayakawa, Issei, and Hiroshi Kamizono. "Solubility of Simulated Hlw Elements in Pyrochlore Structure." MRS Proceedings 257 (1991). http://dx.doi.org/10.1557/proc-257-257.

Full text

Abstract:

ABSTRACTWe have found that lanthanum zirconate (La2Zr2O7) with a pyrochlore structure can be used as a superior host phase for actinide and lantanide elements contained in high-level nuclear waste. The solubility of Ce, Nd and Sr in La2Zr2O7 is determined because Ce and Nd may simulate the segregation of actinide and lanthanide elements at the grain boundaries of polycrystalline La2Zr2O7. The results show that La2Zr2O7 is a promising material for confining actinide and lanthanide elements in its crystal structure.

APA, Harvard, Vancouver, ISO, and other styles

37

"Lantanide complexes with 3-methyl-1-phenyl-4-formylpyrazol-5-one and 1,3,5-benzenetricarboxylic acid hydrazones." Журнал структурной химии 60, no. 3 (2019). http://dx.doi.org/10.26902/jsc_id39531.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

HALEFOGLU, Yusuf Ziya. "Yanma Yöntemi ile Lantanit Katkılı Borat Nano Taneciklerin Sentezi ve Lüminesans Özelliklerinin İncelenmesi." Journal of Boron, July 5, 2018. http://dx.doi.org/10.30728/boron.348553.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!