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Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI)
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Synthesis and Characterization
of 2,2-Biimidazole Complexes of
Oxocations of Molybdenum (VI,
V) and Uranium(VI)
Authors: Samir S. Kandil a;Loutfy H. Madkour a
DOI: 10.1080/00387019308011552
Publication Frequency: 8 issues per year
Published in: Spectroscopy Letters, Volume 26, Issue 3 March 1993 , pages 535 -
550
Subjects: Analytical Chemistry; Chemical Spectroscopy; Chemistry;
Formats available: PDF (English)
View Article: View Article (PDF)
Affiliation:
a Chemistry Department, Faculty of Sciences, Tanta University, Tanta,
EGYPT
Abstract
2,2'-Biimidazole complexes of MoO2
+2, MoO2
+ and UO2
+2 have been prepared and
characterized by elemental analysis, conductance; and 1H NMR, IR and electronic
spectra. Two types of complexes have been identified. Those obtained from slightly
acidic solutions have the formulae MoO2 (H2bim)Cl2.2H2O 1, UO2(H2bim) (Ac)2 2 and
UO2(H2bim)Cl2.2H2O 3; whereas those from alkaline solutions have the formulae
Mo2O4(Hbim)2.2H2O 4, and MO2(Hbim)2 (M = Mo(VI) 5, U(VI) 6). The infrared spectra
of these complexes show characteristic biimidazole frequencies in the 3200-2500,
1550-1000 and 750 cm-1 regions as well as metal oxygen double bonds in the 900
cm-1 region. The stoichiometries of the acetate complex has been confirmed from 1H
NMR signal ratios of bimidazole to acetate protons at 7.3 and 2.3 ppm, respectively.
The electronic spectrum of molybdenum(V) complex showed d-d transition band at
≃13,500 cm-1 in accord with that reported for copper (d9) imidazole complexes; as
well as peaks due to charge transfer bands at 30,000-26,000 cm-1 Peaks assignable
to BIM U(VI) were located at ≃26,600 cm-1. The most probable structures of these
complexes have been suggested.
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This document summarizes research on the copolymerization of ε-caprolactam and L-lactide monomers to produce poly(ester-amide) copolymers. Two organocatalysts were tested: 1-(4-sulfobutyl)−3-methylimidazolium hydrogen sulphate (BAIL) and P4-t-Bu phosphazene superbase (P4). BAIL more effectively catalyzed the ring-opening polymerization of L-lactide, while P4 worked better for ε-caprolactam. The copolymers were characterized using FTIR, NMR, and conversion measurements to analyze composition and structure.
Hexamoybdnum cluster supported on graphene
Hexamolybdenum clusters supported on graphene oxide: visible-light induced photocatalytic reduction of carbon dioxide into methanol
Reaction of a Biomimetic Mo Center with Carbon Dioxide
The document summarizes research into developing a biomimetic molybdenum complex that can reduce carbon dioxide to formate like the enzyme formate dehydrogenase. The complex [MoO(pdt)2]2- was reacted with carbon dioxide, producing an antiferromagnetic molybdenum dimer based on infrared, electron paramagnetic resonance, and mass spectrometry data. Further work is needed to fully characterize the product and deduce the reaction mechanism.
Slideshare
The document summarizes research into developing a biomimetic molybdenum complex that can reduce carbon dioxide to formate like the enzyme formate dehydrogenase. The complex [MoO(pdt)2]2- was reacted with carbon dioxide, producing an antiferromagnetic molybdenum dimer based on infrared, electron paramagnetic resonance, and mass spectrometry data. Further work is needed to fully characterize the product and deduce the reaction mechanism.
0620 20
This document consists of a chemistry examination paper with 17 printed pages and 1 blank page. It contains 10 multi-part chemistry questions testing a range of concepts including stoichiometry, kinetics, thermodynamics, organic chemistry and applications of chemistry. The questions require students to show workings, define terms, perform calculations, write balanced equations and draw structural formulas.
Crystal Structure, Topological and Hirshfeld Surface Analysis of a Zn(II) Zwi...
Abstract: A mononuclear Zn(II) complex of (Zn(H2L) (CH3OH) Cl2
) (1) has been synthesized by using
a nonlinear optically active Zwitterionic Schiff base which is 4-((2-hydroxy-3-methoxybenzylidene)
amino) benzoic acid (H2L). Complex 1 has been structurally analyzed by FTIR and UV spectroscopy,
TGA, Powder-XRD and single crystal X-ray diffraction. X-Ray crystallographic studies revealed Zn(II)
complex crystallizes in a P21/c space group and exists in a distorted trigonal bipyramidal geometry
(τ = 0.68).
Spinel Ferrite Nanoparticles Synthesis, Characterization and Applications
Spinel ferrite nanoparticle have attracted a great attention due to its widely used in several areas such as in electronics devices, biomedical, catalyst and wastewater treatment. The synthesis, characterisation and application of spinel ferrite nanoparticles in various fields is focuses in this review paper. The most commonly used synthesis methods along with their advantages and limitations were discussed. The most common characterisation techniques and their applications such as power applications, biomedical applications, inductors, high frequency and Electromagnetic Interference EMI Suppression are briefly reviewed. D. L. Chaudhari | D. S. Choudhary | K. G. Rewatkar "Spinel Ferrite Nanoparticles: Synthesis, Characterization and Applications" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-3 , April 2020, URL: https://www.ijtsrd.com/papers/ijtsrd30684.pdf Paper Url :https://www.ijtsrd.com/physics/nanotechnology/30684/spinel-ferrite-nanoparticles-synthesis-characterization-and-applications/d-l-chaudhari
UQ364438_OA
This document summarizes the synthesis and characterization of isomeric Yb(III) coordination polymers formed from reactions of YbX3 salts (X = NO3- or CF3SO3-) with 4,4'-bipyridine-N,N'-dioxide (4,4'-bpdo) or 3,3'-bipyridine-N,N'-dioxide (3,3'-bpdo) ligands. Depending on the choice of ligand and anion, either linear 1D chains or 2D and 3D coordination polymer networks were obtained. The 3,3'-bpdo ligand yielded structures similar to 4,4'-bpdo when NO3- was used, but with CF3
Jeevi ppt
This document summarizes the synthesis and study of transition metal complexes of benzaldimino-1,3,4-thiadiazole-2-thiol (BTT). The author synthesized the ligand BTT and its copper, nickel, cobalt, and zinc complexes. The complexes were characterized using infrared spectroscopy, electronic spectroscopy, ESR, cyclic voltammetry, NMR, and magnetic susceptibility measurements. Spectroscopic data indicated the ligand behaves as a bidentate ligand, forming octahedral complexes with the metals. The author thanks advisors and colleagues and concludes the spectral studies support an octahedral geometry for the complexes.
answer sheet theory
This document provides guidance for teachers marking the International General Certificate of Secondary Education (IGCSE) Chemistry exam. It outlines the requirements of the exam and how examiners will award marks. Key points include: the mark scheme should be read with the question paper and exam report; CIE will not discuss the mark scheme; it provides general instructions for marking such as allowing error carry forward in calculations; and examples of how marks will be awarded for sample questions.
Synthesis, Crystal and Molecular Structure Studies of a new Pyrazole compound
The document summarizes the synthesis, crystal structure, and molecular structure of a new pyrazole compound. Key findings include:
- The compound was synthesized and single crystals were obtained via x-ray crystallography. It crystallized in the primitive monoclinic system with two independent molecules in the asymmetric unit.
- Bond lengths and angles were analyzed and found to be consistent with standard values. The pyrazole ring is planar and encased by a phenyl ring, methyl group, and keto group.
- Crystal packing is stabilized by intermolecular C-H⋯O hydrogen bonds and C-H⋯π interactions between molecules. Torsion angles indicate the keto groups
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IOSR Journal of Applied Chemistry (IOSR-JAC) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of applied chemistry and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Chemical Science. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Simple and Effective Method of the Synthesis of Nanosized Fe2O 3particles
Abstract: Nanosized Iron oxide is prepared by using precipitation method from iron nitrate and liquid ammonia. Thermal analysis shows that synthesized iron oxide shows some weight loss and oxide undergoing decomposition, dehydration or any physical change from TGA curve we observe that Iron oxide shows stable weight loss above 4000C. In DTA curve also, there is exothermic and endothermic peak. Which shows phase transition, solid state reaction or any chemical reaction occurred during heating treatment. Morphology is observed by scanning electron microscopy (SEM) shows particles are nanosized. Further morphology observation by Transmission Electron Microscopy (TEM) revels that Iron Oxide has the corundum (Al2O3) structure. Magnetic measurements shows that iron oxide has five unpaired electron and strongly paramagnetic character.
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8th alg -l0.9-0.10
The document provides lesson material on volume and surface area calculations. It includes warm up problems on percentages and perimeter/area. Students are then reminded about formulas to calculate the volume of rectangular prisms and cylinders, as well as the surface area of rectangular prisms and cylinders. Examples are given to find the volume and surface area of various shapes using the provided formulas.
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Қазақ тілі
Сабақтың мақсаты:
а) Білімділік: оқушыларға тұрлаулы мүшелерді ажырату, сөйлемде
атқаратын қызметіне түсінік беру.Сөйлем мүшелері туралы
білімдерін кеңейте түсу.
ә) Дамытушылық: таза, сауатты жазу жазу дағдысын жетілдіру,
оқушылардың ой – өрісін дамыту, өз ойын жүйелі жеткізуге дағдыландыру.
б) Тәрбиелік : оқушылардың өз ана тілін сүюге, құрметтеуге,
тиянақтылыққа тәрбиелеу.
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Complexes
1) The document reports on the synthesis and characterization of 2,2'-biimidazole complexes of molybdenum(VI, V) and uranium(VI) oxocations.
2) Two types of complexes were identified - those from slightly acidic solutions had general formulas of MO2(H2bim)X2.nH2O and UO2(H2bim)(OAc)2, while those from alkaline solutions had formulas of Mo2O4(Hbim)2.2H2O and MO2(Hbim)2.
3) Infrared and NMR spectroscopy as well as electronic spectroscopy were used to characterize the complexes and confirm their proposed structures.
Synthesis, Characterization, Antibacterial and DNA Binding Studies of Mn (II)...
Mn (II) complex of the Schiff base (L), 3-(2-(2-hydroxy-3-methoxybenzylidene) hydrazinyl) quinoxalin-2(1H)-one (VHQO) was prepared and characterized by IR, UV-VIS, Mass, Elemental analysis, TGDTA, magnetic susceptibility and conductivity measurements. VHQO behaved as monobasic, tridentate ligand and formed 1:2 complex (ML2) with the metal ion (M) coordinating through ring nitrogen, azomethine nitrogen and phenolic oxygen. Thermal analysis of the complex indicated the absence of lattice and coordinated water. Based on the spectral and analytical data, octahedral geometry was assigned to the complex. Antibacterial activity of the complex against gram positive bacteria, Bacillus subtillis, Staphylococcus aureus, and gram negative bacteria, Escherichia coli, Proteus vulgaris, Pseudomonas aeroginosa , and Klebsiella pneumonia was studied. The interaction of the complex with Calf Thymus DNA (CT-DNA) was studied by absorption spectroscopy and the intrinsic binding constant was calculated.
Spectroscopy Letters Volume 26 issue 3 1993 [doi 10.1080_00387019308011552] S...
This document summarizes a study that synthesized and characterized complexes of molybdenum and uranium with the ligand 2,2'-biimidazole. Two types of complexes were identified. Those formed from slightly acidic solutions had formulas like MO02(H2bim)Cl2·2H2O, while those from alkaline solutions had formulas like MoO2(Hbim)2. Characterization included elemental analysis, conductivity measurements, 1H NMR spectroscopy, IR spectroscopy, and electronic spectroscopy. The IR spectra showed peaks characteristic of the biimidazole ligand as well as metal-oxygen double bonds. The 1H NMR spectrum supported the proposed structure of one uranium complex. Electronic spectroscopy provided information about
Spectroscopy letters volume 26 issue 3 1993 [doi 10.1080 00387019308011552] s...
This article describes the synthesis and characterization of 2,2'-biimidazole complexes of molybdenum and uranium. Two types of complexes were formed - those from slightly acidic solutions had formulas of MO02(H2bim)Cl2.2H20, U02(H2bim)(Ac)2.2H20, and U02(H2bim)Cl2.2H20. Those from alkaline solutions had formulas of Mo204(H2bim)2.2H20 and M02(Hbim)2 where M is molybdenum or uranium. The complexes were characterized using elemental analysis, conductivity measurements, 1H NMR, IR, and electronic spectroscopy
Spectroscopy letters volume 26 issue 3 1993 [doi 10.1080 00387019308011552] s...
This article describes the synthesis and characterization of 2,2'-biimidazole complexes of molybdenum and uranium. Two types of complexes were formed - those from slightly acidic solutions had formulas of MO02(H2bim)Cl2.2H20, U02(H2bim)(Ac)2.2H20, and U02(H2bim)Cl2.2H20. Those from alkaline solutions had formulas of Mo204(H2bim)2.2H20 and M02(Hbim)2 where M is molybdenum or uranium. The complexes were characterized using elemental analysis, conductivity measurements, 1H NMR, IR, and electronic spectroscopy
Spectroscopy Letters Volume 26 issue 3 1993 [doi 10.1080_00387019308011552] S...
This article describes the synthesis and characterization of 2,2'-biimidazole complexes of molybdenum and uranium. Two types of complexes were formed - those from slightly acidic solutions had formulas of MO02(H2bim)Cl2.2H20, U02(H2bim)(Ac)2.2H20, and U02(H2bim)Cl2.2H20. Those from alkaline solutions had formulas of Mo204(H2bim)2.2H20 and M02(Hbim)2 where M is molybdenum or uranium. The complexes were characterized using elemental analysis, conductivity measurements, 1H NMR, IR, and electronic spectroscopy
Spectroscopy Letters Volume 26 issue 3 1993 [doi 10.1080_00387019308011552] S...
This document summarizes a study that synthesized and characterized complexes of molybdenum and uranium with the ligand 2,2'-biimidazole. Two types of complexes were identified. Those formed from slightly acidic solutions had formulas like MO02(H2bim)Cl2·2H2O, while those from alkaline solutions had formulas like MoO2(Hbim)2. Characterization included elemental analysis, conductivity measurements, 1H NMR spectroscopy, IR spectroscopy, and electronic spectroscopy. The IR spectra showed peaks characteristic of the biimidazole ligand as well as metal-oxygen double bonds. The 1H NMR spectrum supported the proposed structure of one uranium complex. Electronic spectroscopy provided information about
Coordination modes of a new ligand derived from pyrazoline with cr(iii), mn(i...
This document summarizes a study that synthesized and characterized coordination complexes of Cr(III), Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) metal ions with a new ligand derived from pyrazoline. The complexes were analyzed using various techniques including elemental analysis, infrared spectroscopy, NMR spectroscopy, magnetic susceptibility measurements, and electronic spectroscopy. The data indicated the ligand behaves as a neutral bidentate toward the metal ions. The biological activities of the ligand and its complexes were screened against bacteria and fungi, with some complexes showing higher antimicrobial activity than the free ligand.
Synthesis and Characterization of New Complexes of 2-(6-Methoxybenzo[d]thiazo...
Abstract: The synthesis and characterization of manganese (ІІ), cobalt (ІІ), nickel (ІІ), copper (ІІ), zinc (ІІ), cadmium (ІІ) and mercury (ІІ) bidentate 2-(6-methoxybenzo[d]thiazol-2-ylamino)-2-phenyl acetonitrile ligand which was prepared from Benz aldehyde and 6-methoxybenzo[d]thiazol-2-amine in the presence of KCN and acidic medium. The complexes were synthesized by treating an ethanolic solution of the ligand with appropriate amount of metal salts [1:2] [M: L] ratio. The complexes were characterized by using metal and elemental chemical analysis, molar conductance, magnetic susceptibility measurements, FTIR , electronic spectral and mole ratio method. According to the obtained data the probable coordination geometries of manganese (ІІ), cobalt (ІІ), nickel (ІІ), copper (ІІ) zinc (ІІ), cadmium (ІІ) and mercury (ІІ) in these complexes are octahedral. All complexes were found to be non-electrolyte in absolute ethanol, and the complexes were formulated as [ML2Cl2] XH2O. Keywords: 2-(6-methoxybenzo[d]thiazol-2-ylamino)-2-phenyl acetonitrile, N2-donor, transition metals.
Njc15 publication 15
This document summarizes a study that measured the electrical conductivity of transition metal complexes containing manganese, cobalt, nickel, and copper ions coordinated with the ligand 2,2'-bipyridyl in different solvents at 298.16K. The conductivity was analyzed using the Lee-Wheaton conductivity equation. The results were used to calculate conductivity parameters including ionic conductivity, association constant, and average distance between ions. The conductivity parameters were found to depend on the solvent used.
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Some transition metal ions Complexes with 5-({4-amino-2-[(Z)-(2-hydroxybenzylidene) amino]
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(II), Cu (II), Zn (II), Pd (II) and Pt (II). The coordination behavior of the metal ions towards to the investigated
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showed the Metal: Ligand ratio is 1:2 [M: L] ratio. The molar conductance data reveal that all the metal
complexes are non-electrolytic in nature. From the magnetic moments the complexes are paramagnetic except
Zn metal ion complexes have octahedral geometry with coordination number eight. The thermal behavior of
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This document summarizes research on synthesizing zeolite materials from fly ash to remove heavy metals and dyes from wastewater. Fly ash collected from a power plant in Romania was hydrothermally treated to produce two zeolite materials, ZCRns and ZCRs20. These materials were characterized and then tested for their ability to adsorb cadmium, copper ions, and methylene blue dye from single, dual, and triple contaminant systems. Both zeolites showed good adsorption efficiencies, with the highest removal rate being 93.33% for methylene blue. The results indicate these materials have potential as low-cost adsorbents for treating industrial wastewater.
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This document summarizes a study that synthesized and characterized mixed ligand complexes of L-leucine and sulfamethoxazole with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) ions. The complexes were prepared in ethanol-water solution and characterized using techniques like FT-IR, UV-Vis, magnetic susceptibility, and conductivity measurements. FT-IR analysis indicated that both ligands act as bidentate ligands, coordinating through carboxylate and amine groups for L-leucine and sulfonyl oxygen and amine nitrogen for sulfamethoxazole. The complexes were also found to have octahedral geometry and
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A novel series of metal complexes of 2-(thiazol-2-ylimino) thiazolidin-4-one ligand were prepared; the corresponding ligand was synthesized from reaction 2-Chloro-N-(thiazol-2-yl) acetamide with ammonium thiocyanate. The complexes are characterized by FTIR, UV-Vis, molar conductance and mass spectroscopy. The low molar conductance values indicate that the complexes are non-electrolytes.Spectroscopic studies confirmed that the ligand bonded to the metals through the sulphur atoms. Coordination number of copper and nickel complexes is four with square planar geometry, while the cobalt complex has octahedral geometry.In vitro antibacterial activity of ligand and its metal complexes was evaluated using well diffusion method and compared to the standard drug (tetracycline). The antibacterial activitywas examined against Escherichia coli, and pseudomonas aeruginosa, as gram negative bacteria and Staphylococcus aureus as gram positive bacteria. It was found that Nickel complex has the highest antibacterial activity among the synthesized compounds with Zone inhibition diameter in the range 25-29 mm.
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The mixed ligand complexes of Co (II), Ni (II) and Cu (II) with histidine (His.) and 8-hydroxyquinoline (Qui.) have been synthesized and characterized.The resulting complexes were characterized by vibrational and electronic spectral data, thermogravimetric studies , metal analysis and molar conductance measurements. The histidine acts as tridentate ligand, coordinating through the two nitrogen atoms of imidazole ring and the amino group and carboxylate oxygen whereas 8-hydroxyquinoline shows a bidentate nature and the coordination occurs through nitrogen of imine group and oxygen of phenol group. The experimental data suggest that a mononuclear octahedral structure with general formula [M (His.)(Qui.) H2O ] where M= Co (II), Ni (II) and [Cu (His.)(Qui.)H2O] .H2O, thermo gravimetric studies reveal the presence of coordinated water molecules in all complexes. The molar conductance measurements reveal non-electrolytic nature of complexes.
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This document summarizes the synthesis and characterization of ligand diimines and their copper(II) and zinc(II) complexes. Two ligand diimines were synthesized - N,N’-Bis(benzylidène)benzene-1,2-diamine (L1) and N,N’-Bis(4-dimethyaminobenzylidene) propane-1,2-diamine (L2) from reactions of ortho-phenylendiamine and 1,2-diaminopropane with benzaldehyde and 4-dimethylaminobenzaldehyde. The corresponding copper(II) and zinc(II) complexes of formulas (L1
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This document summarizes the use of octahedral molybdenum cluster compounds Cs2[Mo6Br14] and (TBA)2[Mo6Br14] as photocatalysts for the reduction of carbon dioxide to methanol under visible light irradiation. Cs2[Mo6Br14] exhibited higher photocatalytic activity than (TBA)2[Mo6Br14], producing 6679.45 and 5550.53 mmol g−1 of methanol, respectively, after 24 hours of illumination. The clusters have suitable band gaps and light absorption properties for driving the photocatalytic reaction. This study demonstrates the potential of molybdenum cluster complexes for catalyzing important reactions using solar
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Five new mixed-ligand nickel (II) complexes; viz; [Ni (BHM)(PMDT)]1; [Ni(BHM)(dien)] 2; [Ni(BHM)(L1)]3; [Ni(BHM)(L2)] 4, [Ni(BHM)(L3)] 5; where H2BHM= N’-(1E)-(5-bromo-2-hydroxyphenyl) methylidene] benzoylhydrazide, PMDT= N,N,N’,N,”N”-Pentamethyldiethylenetriamine; dien= diethylenetriamine; L1 = N,N- dimethyl-N’ (Pyrid-2-yl-methyl) ethylenediamine; L2= N-methyl-N’-(pyrid-2-ylmethyl)ethylenediamine; L3 = N,N-dimethyl-N’-(6-methyl)pyrid-2-ylmethyl) ethylenediamine, have been synthesized and characterized by using elemental analyses, FAB (fast atomic bombardment), magnetic measurements, electronic absorption , conductivity measurements, cyclic voltammetry (CV) and IR- spectroscopy . All the complexes yielded an irreversible couple that can be assigned to a NiII→ NiI redox process. Infrared spectra, ligand field spectra and magnetic susceptibility measurements agree with the observed octahedral environment. H2BHM is a diprotic tridentate Schiff base ligand (ONO donor atom) whereas L1-L3 possessing N3 coordination sites. The SOD activities have been measured using alkaline DMSO as a source of superoxide radical (O2–) and nitro blue tetrazolium (NBT) as O2– scavenger.
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This document presents a study comparing the adsorption of Cu(II) and Pb(II) ions onto Iranian bentonite from the Birjand area. Characterization of the bentonite found it contains montmorillonite, quartz, oligoclase, gypsum and illite. Batch experiments were conducted to study the effects of initial metal ion concentration on adsorption in single and multi-component systems. Equilibrium data was analyzed using five isotherm models, finding the Langmuir model best fit the data. The maximum adsorption capacities from Langmuir for Cu(II) were 21.10-22.17 mg/g and for Pb(II) were 57.803-40.
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如何办理(uvic毕业证书)维多利亚大学毕业证本科学位证书原版一模一样
原版纸张【微信：741003700 】【(uvic毕业证书)维多利亚大学毕业证】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
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5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
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8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
The binding of cosmological structures by massless topological defects
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
Shallowest Oil Discovery of Turkiye.pptx
The Petroleum System of the Çukurova Field - the Shallowest Oil Discovery of Türkiye, Adana
waterlessdyeingtechnolgyusing carbon dioxide chemicalspdf
The technology uses reclaimed CO₂ as the dyeing medium in a closed loop process. When pressurized, CO₂ becomes supercritical (SC-CO₂). In this state CO₂ has a very high solvent power, allowing the dye to dissolve easily.
SAR of Medicinal Chemistry 1st by dk.pdf
In this presentation include the prototype drug SAR on thus or with their examples .
Syllabus of Second Year B. Pharmacy
2019 PATTERN.
Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
Equivariant neural networks and representation theory
Or: Beyond linear.
Abstract: Equivariant neural networks are neural networks that incorporate symmetries. The nonlinear activation functions in these networks result in interesting nonlinear equivariant maps between simple representations, and motivate the key player of this talk: piecewise linear representation theory.
Disclaimer: No one is perfect, so please mind that there might be mistakes and typos.
dtubbenhauer@gmail.com
Corrected slides: dtubbenhauer.com/talks.html
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
The pygmy halfbeak Dermogenys colletei, is known for its viviparous nature, this presents an intriguing case of relatively low fecundity, raising questions about potential compensatory reproductive strategies employed by this species. Our study delves into the examination of fecundity and the Gonadosomatic Index (GSI) in the Pygmy Halfbeak, D. colletei (Meisner, 2001), an intriguing viviparous fish indigenous to Sarawak, Borneo. We hypothesize that the Pygmy halfbeak, D. colletei, may exhibit unique reproductive adaptations to offset its low fecundity, thus enhancing its survival and fitness. To address this, we conducted a comprehensive study utilizing 28 mature female specimens of D. colletei, carefully measuring fecundity and GSI to shed light on the reproductive adaptations of this species. Our findings reveal that D. colletei indeed exhibits low fecundity, with a mean of 16.76 ± 2.01, and a mean GSI of 12.83 ± 1.27, providing crucial insights into the reproductive mechanisms at play in this species. These results underscore the existence of unique reproductive strategies in D. colletei, enabling its adaptation and persistence in Borneo's diverse aquatic ecosystems, and call for further ecological research to elucidate these mechanisms. This study lends to a better understanding of viviparous fish in Borneo and contributes to the broader field of aquatic ecology, enhancing our knowledge of species adaptations to unique ecological challenges.
Randomised Optimisation Algorithms in DAPHNE
Slides from talk:
Aleš Zamuda: Randomised Optimisation Algorithms in DAPHNE .
Austrian-Slovenian HPC Meeting 2024 – ASHPC24, Seeblickhotel Grundlsee in Austria, 10–13 June 2024
https://ashpc.eu/
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...Abdul Wali Khan University Mardan,kP,Pakistan
hematic appreciation test is a psychological assessment tool used to measure an individual's appreciation and understanding of specific themes or topics. This test helps to evaluate an individual's ability to connect different ideas and concepts within a given theme, as well as their overall comprehension and interpretation skills. The results of the test can provide valuable insights into an individual's cognitive abilities, creativity, and critical thinking skills在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
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一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
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◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
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◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Travis Hills' Endeavors in Minnesota: Fostering Environmental and Economic Pr...
Travis Hills of Minnesota developed a method to convert waste into high-value dry fertilizer, significantly enriching soil quality. By providing farmers with a valuable resource derived from waste, Travis Hills helps enhance farm profitability while promoting environmental stewardship. Travis Hills' sustainable practices lead to cost savings and increased revenue for farmers by improving resource efficiency and reducing waste.
ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
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aziz sancar nobel prize winner: from mardin to nobel
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93
- 1. dth="100%"> [ hide message ] Synthesis and Characterization of 2,2-Biimidazole Complexes of Oxocations of Molybdenum (VI, V) and Uranium(VI) Authors: Samir S. Kandil a;Loutfy H. Madkour a DOI: 10.1080/00387019308011552 Publication Frequency: 8 issues per year Published in: Spectroscopy Letters, Volume 26, Issue 3 March 1993 , pages 535 - 550 Subjects: Analytical Chemistry; Chemical Spectroscopy; Chemistry; Formats available: PDF (English) View Article: View Article (PDF) Affiliation: a Chemistry Department, Faculty of Sciences, Tanta University, Tanta, EGYPT Abstract 2,2'-Biimidazole complexes of MoO2 +2, MoO2 + and UO2 +2 have been prepared and characterized by elemental analysis, conductance; and 1H NMR, IR and electronic spectra. Two types of complexes have been identified. Those obtained from slightly acidic solutions have the formulae MoO2 (H2bim)Cl2.2H2O 1, UO2(H2bim) (Ac)2 2 and UO2(H2bim)Cl2.2H2O 3; whereas those from alkaline solutions have the formulae Mo2O4(Hbim)2.2H2O 4, and MO2(Hbim)2 (M = Mo(VI) 5, U(VI) 6). The infrared spectra of these complexes show characteristic biimidazole frequencies in the 3200-2500, 1550-1000 and 750 cm-1 regions as well as metal oxygen double bonds in the 900 cm-1 region. The stoichiometries of the acetate complex has been confirmed from 1H NMR signal ratios of bimidazole to acetate protons at 7.3 and 2.3 ppm, respectively. The electronic spectrum of molybdenum(V) complex showed d-d transition band at ≃13,500 cm-1 in accord with that reported for copper (d9) imidazole complexes; as well as peaks due to charge transfer bands at 30,000-26,000 cm-1 Peaks assignable to BIM U(VI) were located at ≃26,600 cm-1. The most probable structures of these complexes have been suggested. Bookmark with: CiteULike Del.icio.us BibSonomy Connotea More bookmarks Page 1 of 1Synthesis and Characterization of 2,2 - Biimidazole Complexes of Oxocations of Mol ... 4/12/2010file://C:Documents and SettingskaauDesktopSynthesis and Characterization of 2,2 -...