An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
A new TeZnO3 phase was synthesized by high-pressure techniques. Different from the ambient-pressure orthorhombic phase composed of ZnO5 units, the current high-pressure one crystallizes to a monoclinic structure with space group P21/ n. Moreover, both ZnO4 tetrahedral and ZnO6 octahedral polyhedra are found to occur in this new phase, providing a unique Zn-based material system that simultaneously possesses two distinct coordinated units. Because the outermost orbitals are fully occupied for both Zn2+ and Te4+, the compound exhibits diamagnetism and strong insulating behavior with a wide bandgap as large as 6.0 eV. Dielectric constant and specific heat measurements show a broad anomaly around 240 K. Low-temperature synchrotron X-ray diffraction reveals an isostructural phase transition at this temperature.
Dielectric elastomers have attracted considerable attention both from academia and industry alike over the last two decades due to their superior mechanical properties. In parallel, research on the mechanical properties of dielectrics has been steadily advancing, including the theoretical, experimental, and numerical aspects. It has been recognized that the electromechanical coupling property of dielectric materials can be utilized to drive deformations in functional devices in a more controllable and intelligent manner. This paper reviews recent advances in the theory of dielectrics, with specific attention focused on the theory proposed by Dorfmann and Ogden. Additionally, we provide examples illustrating the application of this theory to analyze the electromechanical deformations and the associated bifurcations in soft dielectrics. We compared the bifurcations in elastic and dielectric materials and found that only compressive bifurcation modes exist in elastic structures, whereas both compressive and tensile modes coexist in dielectric structures. We summarize two proposed ways to suppress and prevent the tensile bifurcations in dielectric materials. We hope that this literature survey will foster further advancements in the field of the electroelastic theory of soft dielectrics.
Abstract Ferromagnetic semiconductors with luminescent effects provide a unique platform for studying magneto-electric-optical multifunctional devices. However, little is known about such materials with spin ordering well above room temperature. By using a unique high-pressure annealing method, a Cr and Fe disordered perovskite oxide SrCr 0.5 Fe 0.5 O 2.875 (SCFO) with a simple cubic structure was prepared. Magnetic measurements demonstrated the ferromagnetic behavior with a spin ordering temperature as high as 600 K. In contrast to metallic SrCrO 3 and SrFeO 3 , SCFO, with a moderate oxygen deficiency, is a direct bandgap semiconductor with an energy gap of 2.28 eV, which is within the visible light region. As a consequence, SCFO displays a green fluorescent effect arising from the d–p bonding and anti-bonding states. Moreover, the photoluminescence intensity can be tuned by a magnetic field. This work opens up a new avenue for research on room-temperature multifunctional materials with coupled magnetic, electrical, and optical performance.
Objective Both heat shock protein A subunit (HspA) and urease B (UreB) subunit as effective immunogen may stimulate the immunoresponse protecting human body against challenge of H.pylori. A recombinant strain which expresses bivalent antigen of HspA and UreB subunit was constructed. Methods Gene encoding the structural A/B subunit of H.pylori heat shock protein/ urease was amplified from H.pylori chromosomal DNA by PCR techniques. The genes were inserted into the prokaryotic expression vector pET 22b(+), and then was transformed into the BL 21(DE3) E.coli strain, expressed which HspA UreB recombinant protein. Results HspA UreB gene was found to be 2061 base pairs ,the recombinant fusion protein encoded polypeptides of 687 amino acid residues, corresponding to calculated molecular masses of 78kD. Western blot analysis of HspA UreB recombinant protein confirmed that it could be specifically recognized by the serum from H.pylori infected patients, and could also be recognized by the serum from BALB/c mice immunized with HspA UreB itself. The urease activity of E.coli cells containing the UreB gene plus the HspA gene was two times greater than that of UreB lonely. Conclusion This result suggested that HspA UreB recombinant protein may be an potential vaccine for control and treatment of H.pylori infection.
BackgroundThe effects of phthalates on human health have gotten a lot of attention. Although phthalates can cause a variety of systemic disorders in humans, there is no published research on the link between phthalate exposure and the development of nephrolithiasis.PurposeThe goal of this study was to look at the connection between phthalates and nephrolithiasis in a nationally representative adult population.MethodIn a cross-sectional analysis, we looked at data from 59,842 adult participants over the age of 20 years in the NHANES database from 2007 to 2018. The association between phthalates and nephrolithiasis was investigated using multivariate logistic regression analysis, machine learning was utilized to predict the relationship between each component and the occurrence of nephrolithiasis, and subgroup analysis was performed to identify sensitive populations.ResultsAfter adjusting for all confounding factors, phthalate metabolites Mono (3-carboxylpropyl) phthalate(MCPP) and Mono-(2-ethyl-5-hydroxylhexyl) phthalate (MEHHP) were positively associated with the occurrence of nephrolithiasis, which Odds ratio (OR) and 95 percent confidence intervals (95%CI) were (ORMCPP = 1.0016, 95%CI:1.0006,1.0027) /(ORMEHHP = 1.0061, 95%CI: 1.0012, 1.0111). Mono-(2-ethyl-5-oxohexyl) phthalate (MEOHP) was negatively correlated with the occurrence of nephrolithiasis (OR = 0.9890, 95%CI: 0.9791, 0.9990).ConclusionsPhthalate exposure is a significant risk factor for kidney stone formation. The phenthalates metabolites MCPP and MEHHP have been shown to increase the risk of kidney stones, whilst MEOHP has been shown to decrease the risk of kidney stones.
A quadruple perovskite oxide $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Co}}_{2}{\mathrm{Re}}_{2}{\mathrm{O}}_{12}$ was synthesized by high-pressure annealing. This compound crystallizes in an $A$- and $B$-site ordered quadruple perovskite structure with space group $Pn\text{\ensuremath{-}}3$. The charge combination is determined to be $\mathrm{Ca}{{\mathrm{Cu}}^{2+}}_{3}{{\mathrm{Co}}^{2+}}_{2}{{\mathrm{Re}}^{6+}}_{2}{\mathrm{O}}_{12}$ by bond valence sum analysis and x-ray absorption spectroscopy. In contrast to other isostructural $A{\mathrm{Cu}}_{3}{B}_{2}{B}_{2}^{\ensuremath{'}}{O}_{12}$ compounds with a single magnetic transition, a long-range antiferromagnetic phase transition originating from the ${A}^{\ensuremath{'}}$-site ${\mathrm{Cu}}^{2+}$ sublattice is found to occur at ${T}_{N}\ensuremath{\approx}28\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Subsequently, the spin coupling between the $B$-site ${\mathrm{Co}}^{2+}$ and ${B}^{\ensuremath{'}}$-site ${\mathrm{Re}}^{6+}$ ions contributes to a ferrimagnetic transition around ${T}_{\mathrm{C}}\ensuremath{\approx}20\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Strong electrical insulating behavior is identified by optical measurement with an energy gap of approximately 3.75 eV. The mechanisms of the spin interactions are discussed in detail.
The state-space approach (SSA), traditionally utilized in modern control theory, has been successfully adopted over the last three decades to investigate the mechanical behaviors of complex structures composed of composite or smart materials. This is largely due to their increasing application across various fields, including aerospace, civil and marine engineering, and transportation vehicles. This paper provides a comprehensive review of the establishment of state-space formulations for structures of typical configurations, such as beams, plates, shells, and trusses, with a particular focus on their applications in the mechanical analyses of various complex aerospace or smart structures using the transfer matrix method. The paper first summarizes the three-dimensional SSAs applied to laminated structures without any assumptions on physical fields. By employing structural theories such as various beam, plate, and shell theories, simplified one-dimensional and two-dimensional SSAs for laminated structures are developed. The paper then outlines the advances in generating analytical solutions for the mechanical behaviors of laminated structures. For the sake of completeness, the paper also provides an account of SSAs applied to complex periodic structures, particularly in beam and truss forms. To overcome the limitations of conventional SSAs related to structures with specialized geometric configuration or under arbitrary boundary conditions, state-space based numerical methods have been proposed, for example, the state-space based differential quadrature method and state-space based finite-element method. The applications of these methods in the analyses of static and dynamic responses of complex structures are extensively reviewed. It is observed that there are still intriguing and potential research topics for the development of advanced SSAs with enhanced versatility and the studies on practical complex structures used in modern engineering, particularly in aerospace industry. Therefore, this review is expected to be beneficial for researchers in the fields of analytical and numerical methods, composite structures, aerospace, structural engineering, and more.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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