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Study on the Crustal Stability in Three-Gorges Area of the Yangtze River

Li Ping,Li Yuanjun

Strategic Study of CAE 2004, Volume 6, Issue 6, Pages 26-34

Abstract: situated on the intact rock mass composed of diorite-granite at the southern termination of the Huangling blockThe Huangling block as a sub-plate having double-layer structure (crystalline basement and sedimentaryTectonic deformation within the block is not significant, with exception of a slight southeastward tiltingThe block is confined by many active structures, of which the sub-longitudinal Yuan*an and Xiannushan

Keywords： Three-Gorges Dam on the Yangtze River Huangling block strong seismogenic zone crustal stability

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Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3, Pages 450-456 doi: 10.1007/s11705-018-1735-6

Abstract: fabricated by hydrogen-bonding azobenzene derivatives (AzoR) to poly(4-vinyl pyridine) blocks of polystyrene-block-poly

Keywords： laser ablation block copolymers hydrogen-bond azobenzene derivatives supramolecular assembly

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Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0968-8

Abstract: ductility of their compression zones, the present study proposes using a precast confined concrete block

Keywords： ductility four-point bending test glass fiber-reinforced polymer precast confined concrete block

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Preparation of polysulfone-based block copolymer ultrafiltration membranes by selective swelling and

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5, Pages 745-754 doi: 10.1007/s11705-021-2038-x

Abstract: Selective swelling of block copolymers of polysulfone-b-poly(ethylene glycol) is an emerging strategySelective swelling was performed on the obtained block copolymer structures in the solvent pair of ethanolhydrochloric acid and the spaces initially occupied by CaCO₃ provided extra pores to the block

Keywords： block copolymers selective swelling ultrafiltration CaCO₃ nanoparticles sacrificial nanofillers

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Thermoresponsive block copolymer supported Pt nanocatalysts for base-free aerobic oxidation of 5-hydroxymethyl

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 6, Pages 1514-1523 doi: 10.1007/s11705-021-2092-4

Abstract: a thermoresponsive poly(acrylamide-co-acrylonitrile)-b-poly(N-vinylimidazole) blockThe imidazole groups in the block copolymer were conducive to the improvement of catalytic performanceGood stability and reusability were observed over these copolymer-immobilized catalysts with no obvious

Keywords： aerobic oxidation base-free 5-hydroxymethyl-2-furfural Pt nanoparticle thermoresponsive block copolymer

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An Enhanced Physically Based Scour Model for Considering Jet Air Entrainment

Rafael Duarte,António Pinheiro,Anton J. Schleiss

Engineering 2016, Volume 2, Issue 3, Pages 294-301 doi: 10.1016/J.ENG.2016.03.003

Abstract:

Based on systematic experiments on the influence of air entrainment on rock block stability in plungeBlock ejection from the rock mass depends on a combination of the aerated time-averaged pressure coefficient

Keywords： Air entrainment Uplift Rock scour Dam safety High-velocity jets Block stability Scour assessment

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Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3, Pages 440-447 doi: 10.1007/s11705-017-1626-2

Abstract: Isothermal-isobaric molecular dynamics simulation was used to study the diffusion mechanism of water in polyurethane- -poly( -isopropyl acrylamide) (PU- -PNIPAm) with a hydrophobic PU/hydrophilic PNIPAm mass ratio of 1.4 to 1 at 298 K and 450 K. Here, the experimental glass transition temperature ( ) of PU is 243 K while that of PNIPAm is 383 K. Different amounts of water up to 15 wt-% were added to PU- -PNIPAm. We were able to reproduce the specific volumes and glass transition temperatures (250 K and 390 K) of PU- -PNIPAm. The computed self-diffusion coefficient of water increased exponentially with increasing water concentration at both temperatures (i.e., following the free volume model of Fujita). It suggested that water diffusion in PU- -PNIPAm depends only on its fractional free volume despite the free volume inhomogeneity. It is noted that at 298 K, PU is rubbery while PNIPAm is glassy. Regardless of temperature, radial distribution functions showed that water formed clusters with sizes in the range of 0.2–0.4 nm in PU- -PNIPAm. At low water concentrations, more clusters were found in the PU domain but at high water concentrations, more in the PNIPAm domain. It is believed that water molecules diffuse as clusters rather than as individual molecules.

Keywords： molecular dynamics simulation amphiphilic block copolymer free volume water diffusivity fujita model

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Wear mechanism of disc-brake block material for new type of drilling rig

WANG Xinhua, WANG Simin, ZHANG Siwei, WANG Deguo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1, Pages 10-16 doi: 10.1007/s11465-008-0009-2

Abstract: Topography and elementary components of the brake block’s wear surface are analyzed by employing SEMWhen the frictional temperature is lower, the surface film of the brake block is thinner, dense, smoothwear, the hard peaks from the friction surface of the disc-brake plough on the surface of the brake blockfriction heat, obvious softening and plastic flow can be found on the friction surface of the brake blockThermal decomposition of cohesive material in the brake block is simultaneously strengthened, so that

Keywords： asbestos-free frictional Fracture cyclization friction disc-brake

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Spatial embedded reinforcement of 20-node block element for analysis PC bridges

LONG Peiheng, DU Xianting, CHEN Weizhen

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3, Pages 274-280 doi: 10.1007/s11709-008-0039-1

Abstract: The formula for the contribution of prestressed reinforcement on embedded reinforcement element is derived according to the mechanical behavior of PC bridges and the foundational principle of finite element method. Mechanical concept is definite and examples validate the calculation results. Reinforcement element model allows generating a finite element mesh without taking into consideration the layout of reinforcements. Furthermore, the prestressing tendon may pass through the concrete elements in an arbitrary manner. It is an effective approach that the no-node loads are diverted from the tendons to the adjacent concrete elements. A useful arithmetic analysis of the spatial curved tendon PC Bridges is provided.

Keywords： arithmetic analysis calculation prestressed reinforcement mechanical arbitrary

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A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic

Chao WU,Lu-ping XU,Hua ZHANG,Wen-bo ZHAO

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 9, Pages 796-804 doi: 10.1631/FITEE.1500058

Abstract: The block accumulating semi-coherent integration of correlations (BASIC) is a state-of-the-art method, but calculating the inter-block conjugate products restricts BASIC in a low signal-to-noise ratio (We propose a block zero-padding method based on a discrete chirp-Fourier transform (DCFT) for parameterThe proposed method combines DCFT and block zero-padding.

Keywords： Threshold detection Discrete chirp-Fourier transform Block zero-padding High dynamic Weak L1 signal

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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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Repression of CDKN2C caused by PML/RARα binding promotes the proliferation and differentiation block

Xiaoling Wang,Yun Tan,Yizhen Li,Jingming Li,Wen Jin,Kankan Wang

Frontiers of Medicine 2016, Volume 10, Issue 4, Pages 420-429 doi: 10.1007/s11684-016-0478-3

Abstract: highlights the importance of CDKN2C inactivation in the abnormal cell cycle progression and differentiation block

Keywords： CDKN2C acute promyelocytic leukemia cell cycle arrest differentiation

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Analysis of A Block Cipher Based on Chaos

Jin Chenhui

Strategic Study of CAE 2001, Volume 3, Issue 6, Pages 75-80

Abstract:

In this paper, it is pointed out that the block cipher proposed in “Design of Block Cipher substitution

Keywords： chaos sequence block cipher transposition cipher attack with known plaintext attack with ciphertext only

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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