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Resonance Analysis for Tilted Support Spring Coupled Nonlinear Packaging System Applying Variational Iteration Method
submitted by pedretti 8 minutes ago - Topic: Civil Engineering
The coupled nonlinear dynamical equations were developed for a tilted spring packaging system with critical components. The approximate solution and resonance conditions of system were obtained applying a variational iteration method. The resonance conditions, which should be avoided in the packa...



Maximum Likelihood Estimation of the VAR(1) Model Parameters with Missing Observations
submitted by pedretti 8 minutes ago - Topic: Civil Engineering
Missing-data problems are extremely common in practice. To achieve reliable inferential results, we need to take into account this feature of the data. Suppose that the univariate data set under analysis has missing observations. This paper examines the impact of selecting an auxiliary complete d...

Iron-Salt-Promoted Highly Regioselective α and β Hydrophosphination of Alkenyl Arenes
submitted by ditzler 8 minutes ago - Topic: Engineering
Iron(ic) phosphination: The iron-promoted hydrophosphination of alkenyl arenes with diphenylphosphine as phosphinating agent has been established. This method provides efficient access to diarylalkylphosphines. The regioselectivity of the reaction can be fine-tuned by the choice of the iron salts...

Experimental and Computational Studies on the Formation of Three para-Benzyne Analogues in the Gas Phase
submitted by ditzler 8 minutes ago - Topic: Engineering
Experimental and computational studies on the formation of three gaseous, positively-charged para-benzyne analogues in a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer are reported. The structures of the cations were examined by isolating them and allowing them to react with...

Bisguanidines with Biphenyl, Binaphthyl, and Bipyridyl Cores: Proton-Sponge Properties and Coordination Chemistry
submitted by ditzler 8 minutes ago - Topic: Engineering
Herein, we report on the synthesis, protonation, and coordination chemistry of chelating guanidine ligands with biphenyl, binaphthyl, and bipyridyl backbones. The ligands are shown to be proton sponges, and this protonation was studied experimentally and by using quantum-chemical calculations. Gr...



Salimabromide: Unexpected Chemistry from the Obligate Marine Myxobacterium Enhygromxya salina
submitted by ditzler 8 minutes ago - Topic: Engineering
Marine myxobacteria (Enhygromyxa, Plesiocystis, Pseudoenhygromyxa, Haliangium) are phylogenetically distant from their terrestrial counterparts. Salimabromide is the first natural product from the Plesiocystis/Enhygromyxa clade of obligatory marine myxobacteria. Salimabromide has a new tetracycli...

Ion-Pair-Based Assemblies Comprising Pyrrole–Pyrazole Hybrids
submitted by ditzler 8 minutes ago - Topic: Engineering
Modified 3,5-dipyrrolylpyrazole (DPP) derivatives in their protonated form produce planar [2+2]-type complexes with trifluoroacetate (TFA) ions. These complexes serve as constituent components of ion-pair-based assemblies. An essential strategy for the construction of dimension-controlled organiz...

Multistimuli-Responsive Supramolecular Organogels Formed by Low-Molecular-Weight Peptides Bearing Side-Chain Azobenzene Moieties
submitted by ditzler 8 minutes ago - Topic: Engineering
This work demonstrates that the incorporation of azobenzene residues into the side chain of low-molecular-weight peptides can modulate their self-assembly process in organic solvents leading to the formation of stimuli responsive physical organogels. The major driving forces for the gelation proc...

Quantum Chemical Study of the Reactions between Pd+/Pt+ and H2O/H2S
submitted by ditzler 8 minutes ago - Topic: Engineering
The study of the reactions of water and hydrogen sulfide with palladium and platinum cations has been completed in this work, in both low- and high-spin states. Our calculations predict that only the formation of platinum sulfide is exothermic (in both spin states), whereas for the remaining spec...

9-(4-Dimethylaminophenyl)benzo[b]quinolizinium: A Near-Infrared Fluorophore for the Multicolor Analysis of Proteins and Nucleic Acids in Living Cells
submitted by ditzler 8 minutes ago - Topic: Engineering
All lit up: The title compound operates as a fluorescent light-up probe that enables the detection of different biologically relevant hosts at different fluorescence maxima. It is demonstrated that this chemosensor also allows the fluorimetric multicolor analysis of different components in living...

Vibrational spectra study of phosphorus dendrimer containing azobenzene units on the surface
submitted by Nokia 10 minutes ago - Topic: Engineering
The FTIR and FT Raman spectra of the first generation dendrimers, possessing oxybenzaldehyde (G 1) or oxyphenylazobenzaldehyde (G 2) terminal groups and sodium 4-[4-oxyphenyl)azo]-benzaldehyde (SOAB) were studied. The structural optimization and normal mode analysis were performed for dendrimer G...

Organic crystals bearing both channels and cavities formed from tripodal adamantane molecules
submitted by Nokia 10 minutes ago - Topic: Engineering
Three adamantane-based tripodal molecules bearing either a benzene, pyridine, or toluene unit (1–3) form molecular organic networks (1a–3a) with internal spaces, via intermolecular non-covalent interactions such as CH/π, CH/N, and CH/O interactions in the solid state. Crystals of 1a and 2a f...

Heteroditopic thiacalix[4]arene receptor having ester and bipyridyl moieties for ions binding with positive/negative allosteric effect
submitted by Nokia 10 minutes ago - Topic: Engineering
A novel ditopic receptor possessing two complexation sites and bearing 1,3-alternate conformation based thiacalix[4]arene was prepared. The binding behaviors with Na+, K+ and Ag+ ions have been examined by 1H NMR titration experiment in (CDCl3/CD3CN; 10:1, v/v) solution. The job plots proves 1:1 ...

Triquinane scaffolds: Shape and geometry as a function of saturation and bridgehead groups
submitted by Nokia 10 minutes ago - Topic: Engineering
Polycyclic hydrocarbon compounds, also known as “cage compounds”, are of interest in drug discovery due to their versatility as scaffolds. Derivatives of both pentacycloundecane-dione and triquinane-dione have been the focus of numerous investigations as multifunctional neuroprotective drugs ...

Spectral, thermal, structural, optical and antimicrobial activity studies on 2-methylimidazolinium picrate – An organic charge transfer complex
submitted by Nokia 10 minutes ago - Topic: Engineering
An organic charge transfer (CT) complex, 2-methylimidazolinium picrate was grown by slow evaporation solution growth method at ambient temperature. While the stoichiometric ratio of the complex was confirmed by CHN analysis, its crystallinity was evident from the powder X-ray diffraction pattern....




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