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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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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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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Engineering safety during maintenance outages is determined by the stability of the tunnel face.Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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

Shuvankar DAS; Debarghya CHAKRABORTY

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 8,   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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Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0035-5

Abstract: Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Keywords： finite element power     stability rock escarpment    

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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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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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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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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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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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Construction of nitrogen-doped carbon cladding LiMnO film electrode with enhanced stability for electrochemically

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 2050-2060 doi: 10.1007/s11705-023-2343-7

Abstract: Reducing the dissolution of Mn from LiMn2O4 (LMO) and enhancing the stability ofThe modified C-N@LMO film electrode exhibited lower Mn dissolution and better cyclic stability than the

Keywords： LiMn2O4     lithium extraction     surface coating     cyclic stability     Mn dissolution    

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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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Title Author Date Type Operation

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

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

Journal Article

Evaluation and prediction of slope stability using machine learning approaches

Journal Article

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

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

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

Shuvankar DAS; Debarghya CHAKRABORTY

Journal Article

Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Journal Article

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

Zhaomiao LIU, Chengyin ZHANG, Feng SHEN

Journal Article

Three-dimensional stability analysis of the dam foundation at Baise

XU Qianjun, LI Xu, CHEN Zuyu

Journal Article

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

YU Jiancheng, TONG Hao, HUANG Wei

Journal Article

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

Journal Article

Seismic stability of earth slopes with tension crack

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

Journal Article

Enhanced methanation stability of nano-sized MoS

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

Journal Article

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

Xinyu HU, Zixin ZHANG, Scott KIEFFER

Journal Article

Construction of nitrogen-doped carbon cladding LiMnO film electrode with enhanced stability for electrochemically

Journal Article

Regulation of NLR stability in plant immunity

Tao WANG, Jiaxin LI, Qian-Hua SHEN

Journal Article