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Solvates and polymorphs of clindamycin phosphate: Structural, thermal stability and moisture stability

Junbo Gong, Dejiang Zhang, Yuanyuan Ran, Keke Zhang, Shichao Du

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 2, Pages 220-230 doi: 10.1007/s11705-017-1624-4

Abstract: Clindamycin phosphate (CP), an antibacterial agent, has been reported to form several solid-state forms. The crystal structures of two CP solvates, a dimethyl sulfoxide (DMSO) solvate and a methanol/water solvate (solvate V), have been determined by single crystal X-ray diffraction. The properties and transformations of these forms were characterized by powder X-ray diffraction, Single-crystal X-ray diffraction, differential scanning calorimetry, thermo gravimetric analysis, hot-stage microscopy, and dynamic vapor sorption. Very different hydrogen bonding networks exist among the host-host and host-solvent molecules in the two crystal structures, resulting in different moisture stabilities. The thermal stabilities of the two solvates upon heating and desolvation were also studied. When the temperature was above the boiling point of methanol, solvate V converted to a polymorphic phase after a one step desolvation process, whereas the desolvation temperature of the DMSO solvate was below the boiling point of DMSO. At the relative humidity above 43%, the DMSO solvate transformed to a hydrate at 25 °C. In contrast, solvate V did not transform at any of the humidities studied.

Keywords： clindamycin phosphate solvate crystal structure thermal stability moisture stability

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Evaluation and prediction of slope stability using machine learning approaches

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4, Pages 821-833 doi: 10.1007/s11709-021-0742-8

Abstract: In this paper, the machine learning (ML) model is built for slope stability evaluation and meets the

Keywords： slope stability factor of safety regression machine learning repeated cross-validation

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Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and

Frontiers of Structural and Civil Engineering Pages 1040-1055 doi: 10.1007/s11709-022-0841-1

Abstract: In the present study, the stability of a vertical rock escarpment is determined by considering the influenceThe change in stability due to the presence of undercut is expressed in terms of a non-dimensional stabilityThe obtained results indicate that undercut can cause a severe stability problem in rock mass havingdeveloped design equation as well as design charts can be useful for practicing engineers to determine the stability

Keywords： undercut vertical escarpment stability Hoek-Brown yield criterion PCP

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Modified Bishop method for stability analysis of weakly sloped subgrade under centrifuge model test

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3, Pages 727-741 doi: 10.1007/s11709-021-0730-z

Abstract: The accuracy of traditional slice methods for computing the stability safety factor of weakly slopedIn this study, a novel modified Bishop method was developed to improve the accuracy of the stability

Keywords： weakly sloped subgrade stability analysis additional force influential force modified Bishop method

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Slope stability analysis based on big data and convolutional neural network

Frontiers of Structural and Civil Engineering Pages 882-895 doi: 10.1007/s11709-022-0859-4

Abstract: The Limit Equilibrium Method (LEM) is commonly used in traditional slope stability analyses, but it isDue to its complexity and nonlinearity involved in the evaluation process, it cannot provide a quick stabilityThe CNN trained with this sample database was then applied to the stability prediction of 15 real slopesThe results show that the slope stability prediction method based on the CNN does not need complex calculationMoreover, the prediction accuracy of the CNN trained by the sample database for slope stability analysis

Keywords： slope stability limit equilibrium method convolutional neural network database for slopes big data

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Three-dimensional stability analysis of the dam foundation at Baise

XU Qianjun, LI Xu, CHEN Zuyu

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2, Pages 217-221 doi: 10.1007/s11709-007-0026-y

Abstract: usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensional stabilityA three-dimensional stability analysis method based on the upper-bound theorem was employed to solve

Keywords： ordinary two-dimensional randomly monolith three-dimensional stability different

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Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity

Zhaomiao LIU, Chengyin ZHANG, Feng SHEN

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 359-368 doi: 10.1007/s11465-011-0222-2

Abstract: The vortex effect is weakened, and the stability of the oil cavity is enhanced with the increase in lubricantinlet speed, depth, and inlet radius of the oil cavity causes the vortex effect to increase and the stability

Keywords： hydrostatic oil cavity flow state oil cavity pressure stability vortex

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Stability analysis of layered slopes in unsaturated soils

Frontiers of Structural and Civil Engineering Pages 378-387 doi: 10.1007/s11709-022-0808-2

Abstract: This study presents stability analyses of layered soil slopes in unsaturated conditions and uses a limitOne-dimensional steady infiltration and evaporation conditions are considered in the stability analysesParametric analyses are conducted to explore the influences of the matric suction on the stability ofTherefore, the location and thickness of the clay layer have significant influences on slope stabilityInfiltration/evaporation can obviously affect the stability of unsaturated layered slopes, but their

Keywords： slope stability suction stress unsaturated soil layered slope limit equilibrium

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Design and stability analysis of continuous skew tied-arch bridge over Bin Jiang River

YU Jiancheng, TONG Hao, HUANG Wei

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 1, Pages 37-42 doi: 10.1007/s11709-008-0004-z

Abstract: The stability analytical types are also introduced and the first elastic stability theory is used.A space finite element model has been built to analyze the stability performances in both constructionWhen there are more and stronger inner crossbeams, the influence of the end crossbeams on arch stability

Keywords： out-plane buckling unremarkable crossbeam stability analytical orthogonal

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Generation of enhanced stability of SnO/In(OH)/InP for photocatalytic water splitting by SnO protection

Frontiers in Energy 2021, Volume 15, Issue 3, Pages 710-720 doi: 10.1007/s11708-021-0764-x

Abstract: In this paper, it is demonstrated that the stability and activity of the InP-based catalyst are effectively

Keywords： SnO/In(OH)₃/InP photocatalyst enhanced activity and stability for water splitting corrosion

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Seismic stability of earth slopes with tension crack

Yundong ZHOU, Fei ZHANG, Jingquan Wang, Yufeng GAO, Guangyu DAI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4, Pages 950-964 doi: 10.1007/s11709-019-0529-3

Abstract: Presented is an extension of variational analysis of slope stability with a tension crack consideringBoth translational and rotational failure mechanisms are included in a pseudo-static analysis of slope stabilityDeveloped is a closed-form to assess the seismic stability of slopes with zero tensile strength.The results indicate that the presence of the tension crack has significant effects on the seismic stabilityConsidering soil tension strength in seismic slope analysis may lead to overestimation on the stability

Keywords： slope stability tension crack limit equilibrium seismic effect

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A real-life stability model for a large shield-driven tunnel in heterogeneous soft soils

Xinyu HU, Zixin ZHANG, Scott KIEFFER

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2, Pages 176-187 doi: 10.1007/s11709-012-0149-7

Abstract: This paper presents a real-life face stability model to determine the minimal pressure needed at the

Keywords： analytical solution shield-driven tunnel multilayered soil face stability

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Regulation of NLR stability in plant immunity

Tao WANG, Jiaxin LI, Qian-Hua SHEN

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 2, Pages 97-104 doi: 10.15302/J-FASE-2018248

Abstract: proteasome system and the HSP90 chaperones have emerged as having key functions in the regulation of NLR stabilityThe N-end rule pathway of protein degradation is also directly linked to NLR stability.Recent progress in the regulation of NLR stability and turnover is summarized here, focusing on the key

Keywords： ligase degradation nucleotide-binding leucine-rich repeat receptor plant immunity proteasome protein stability

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Enhanced methanation stability of nano-sized MoS

Zhenhua LI, Jia HE, Haiyang WANG, Baowei WANG, Xinbin MA

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 1, Pages 33-39 doi: 10.1007/s11705-014-1446-6

Abstract: A series of unsupported MoS catalysts with or without Al O modification was prepared using a modified thermal decomposition approach. The catalysts were tested for the methanation of carbon monoxide and the optimum one has 25.6 wt-% Al O content. The catalysts were characterized by nitrogen adsorption measurement, X-ray diffraction and transmission electron microscopy. The results show that adding appropriate amount of Al O increases the dispersion of MoS , and the increased interaction force between MoS and Al O can inhibit the sintering of active MoS to some extent.

Keywords： unsupported catalyst molybdenum sulfide stability alumina methanation

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Vehicle roll stability control with active roll-resistant electro-hydraulic suspension

Lijun XIAO, Ming WANG, Bangji ZHANG, Zhihua ZHONG

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1, Pages 43-54 doi: 10.1007/s11465-019-0547-9

Abstract: This study examines roll stability control for vehicles with an active roll-resistant electro-hydraulicThe enhancement in vehicle roll stability through the RREHS subsystem is also verified.

Keywords： electro-hydraulic suspension roll stability LQR experiment