Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Lin Fang, Hua Hu, Ronald G. Larson; DNA configurations concentration in shearing flow near a glass surface microchannel. J. Rheol. 1 January 2005; 49 (1): 127–138. https://doi.org/10.1122/1.1822930 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex...

Prefabricated underground structures were first researched in China to address the serious social and environmental issues associated with construction. Five metro stations have been built on Line 2 of Changchun Metro using this new prefabrication technology. The joints connecting prefabricated elements are most critical components such structures. In study, experiments numerical simulations investigating influences different grouted mortise tenon joint geometrical parameters conducted...

The MT·G-Joint (grouted mortise-tenon joint), invented as the connection between large prefabricated elements, is most important component in underground structures. Its shear performance critical to overall mechanical of structure. This paper carries out four-point pure experiment investigate MT·G-Joint. key method then proved be suitable for when axial load 0 kN based on experimental results. In addition, combining and results, calculation capacity, improved (ISKM), proposed account model...

We measure the time-dependent concentration and stretch of λ-phage DNA molecules near a glass surface in torsional shear flow using epi-fluorescence microscopy. find that thickness depletion layer increases with increasing Weissenberg number over time scale on order for diffusion across layer, qualitative agreement recent theory Ma Graham (2005) based FENE-P dumbbell model. However, steady-state experimental at high (Wi = 10) is an magnitude thinner than expected from these predictions. The...

We investigate optically the time-dependent concentration and mean fractional stretch of λ-phage DNA molecules near a solid surface in torsional shear flow, for solutions concentrations from 0.1c* to 3.0c*. At high Weissenberg number (Wi ≥ 10), polymer migration caused by hydrodynamic interaction with diminishes as increases 1.0c*, indicating that screening wall hydrodynamics occurs some degree range traditionally recognized "dilute". In addition, continues exist diminished form up 3.0c*,...

This paper analyzes the law of joint deformation grouted mortise‐tenon with 1 : prototype test in key working direction types under 38 conditions different types, tenon lengths, grouting ranges, materials, and loading combinations for prefabricated metro station. The performance has also been compared. In addition, finite element models have built, stages are discussed. influences on influencing factors discovered. development main laws each stage joints obtained. Moreover, this compares...

The grouted mortise‐tenon joint, invented as the connection between large prefabricated elements, is most important component in underground structures. This paper conducts analysis of load‐carrying capacity performance and failure mode with 1 : prototype test key working direction different double joint types for metro station. resistance moment developed used to analyze bending bearing characteristic curve, corresponding results each stage curve are described detail. In addition,...

The grouted mortise‐tenon joint, invented as the connection between large prefabricated components, is key to underground structures, and double‐tenon joint most widely used in metro station structure. This paper conducts characteristic analysis of bending stiffness with a 1 : prototype test working direction different types for double joint. results show that variable under loads. Change laws without auxiliary pretightening device tension side compression are also discussed. correlations...

Abstract The construction of transportation infrastructure is transferring from ground to underground, which could evacuate the urban traffic and also future trend expansion our cities. cobble stratum brings about many technical problems in underground engineering. Based on calibration test macroscopic mechanical characteristic curve, microscopic calculation parameters particle flow code simulation used for strata Urumchi were determined. According establishing numerical model pebble tunnels...

To determine the hysteretic fracture mechanism of hard and naturally cracked surrounding rock mass, uniaxial biaxial compression tests were performed on rhyolite specimens. In test, displacements strains around U-shaped opening monitored throughout to study pattern distribution stress. compare with experimental results, finite difference code<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">F</mml:mi><mml:mi...

This paper described the structure and working principle of porous window based on unsaturated media evaporative refrigeration. The method standardization for calculating evaluating performance have been put forward. influences environmental parameters heat transfer coefficient refrigeration placed slope roof flat are investigated by numerical simulation. calculation results show that refrigerating is better than roof. At same time, It pointed out beneficial building energy efficiency.

In order to evaluate the effect of roughness surface and its mechanical deformation on leakage rate gasket seal structure, concept effective separation height was introduced characterize characteristic scale interface channel. The can be achieved by finite element analysis contact a single rough peak combined with Roth model. numerical results show that obtained parabolic is close experimental value, influence angle settlement very small. On basis height, this paper realizes theoretical...

Leakage of these hatches with large sizes must be strictly controlled in any operating conditions for the safety a nuclear power plant. In this work, an effective numerical approach to construct leakage prediction model analysis tightness performance rubber O-ring sealing structure large-size pressure gate was proposed. The is built based on transport theory porous media, and combined micro roughness effect macro mechanical behavior leak rate, which were obtained by using Finite Element...

Abstract The widely distributed cobble in the subsurface brings about lots of technical problems to underground projects. Based on physical and mechanical characteristics pebble layer, PFC particle flow software was used establish a triaxial numerical test model. Considering multifarious situations, tests were carried out with different mesoscopic parameters, influence parameters types sand pebbles macroscopic properties analyzed. Studying both contact stiffness friction coefficient response...