The Experts below are selected from a list of 88428 Experts worldwide ranked by ideXlab platform
Zhanbin Feng - One of the best experts on this subject based on the ideXlab platform.
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uv reconfigurable shape memory polyurethane with a high Recovery Ratio under large deformation
Industrial & Engineering Chemistry Research, 2021Co-Authors: Zhanbin Feng, Weisheng Gao, Nanying Ning, Liqun Zhang, Ming TianAbstract:The shape memory thermoplastic polyurethane (TPU) generally exhibits a phase-separated structure, in which the hard segments form the hard domains via hydrogen bonds, and plays an important role in...
Denis Lourdin - One of the best experts on this subject based on the ideXlab platform.
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Novel Shape-Memory Materials Based on Potato Starch
Macromolecular Materials and Engineering, 2010Co-Authors: Cyril Vechambre, Laurent Chaunier, Denis LourdinAbstract:Shape-memory properties such as shape fixity and Recovery Ratio of amorphous starch-based materials extruded under normal conditions were evaluated for the case of single and cyclic Recovery processing. This study focused on the effect of moisture as a stimulus for the activation of Recovery. A high Recovery Ratio (R(r) > 90%) was obtained at high relative humidity, at deformation Ratios up to 200%. In the case of plasticized starch with a glycerol content of 10%, the Recovery Ratio was close to 50% because crystallization limited the shape Recovery. Results were compared to those obtained with synthetic or bio-based shape-memory polymers such as semi-crystalline PU or PLAGC. Efficient shape memory properties for a non-modified biopolymer are highlighted in this study
Ming Tian - One of the best experts on this subject based on the ideXlab platform.
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uv reconfigurable shape memory polyurethane with a high Recovery Ratio under large deformation
Industrial & Engineering Chemistry Research, 2021Co-Authors: Zhanbin Feng, Weisheng Gao, Nanying Ning, Liqun Zhang, Ming TianAbstract:The shape memory thermoplastic polyurethane (TPU) generally exhibits a phase-separated structure, in which the hard segments form the hard domains via hydrogen bonds, and plays an important role in...
Yang Yiran - One of the best experts on this subject based on the ideXlab platform.
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Study on the Characteristics of Top-Coal Caving and Optimization of Recovery Ratio in Steeply Inclined Residual High Sectional Coal Pillar
Geofluids, 2020Co-Authors: Wenhua Yang, Xingping Lai, Shan Pengfei, Feng Cui, Yang YiranAbstract:This paper is aimed at solving the technical problems such as low Recovery Ratio and frequent disasters in steeply inclined and extrathick coal seams at residual high sectional coal pillar. It takes the Wudong Coal Mine as an engineering background, a typical mine of steeply inclined and extrathick coal seams; the structural features of the top-coal caving at the steeply inclined residual high sectional coal pillar were analyzed using methods such as field monitoring and numerical simulation; a mechanical model of the top-coal arch structure was constructed, and the calculation method of top-coal caving height and related influencing factors was obtained. The results showed that the top-coal caving in the steeply inclined residual high sectional coal pillar was characterized as arch. Due to the existence of arch structure, the smooth caving of the top coal was hindered, resulting in a low top-coal Recovery Ratio, low support pressure at the working face, and differences detected by borehole television on the distribution of the top-coal cracks. With the advancement of the working face, the top-coal arch structure was in the process of dynamic evolution, as the old arch balance system was continuously replaced by the new arch balance system, and it continuously moved towards the upper top coal. The top-coal caving height was affected by factors such as length of the working face, bulk density of overlying coal rock, and cohesion of the top coal. The top-coal caving height increased with the length of the working face and the bulk density of the overlying coal rock mass but was inversely proportional to the cohesion of the top coal. Under the current mining conditions, the top-coal caving height was 39.8 m, which was much lower than the residual high sectional coal pillar height (71 m); the top coal cannot collapse completely. Based on the characteristics of the top-coal caving structure, the technology of sublevel advanced presplitting blasting was adopted to weaken the top coal in engineering practice, so that the top-coal caving structure moved up naturally. The daily coal production in the working face has increased by an average of 2419.6 tons, which has significantly improved the top-coal Recovery Ratio and production efficiency. The result provided a theoretical basis and application reference for similar residual high sectional coal pillar Recovery.
Takayuki Kato - One of the best experts on this subject based on the ideXlab platform.
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A risk factor associated with subsequent new vertebral compression fracture after conservative therapy for patients with vertebral compression fracture: a retrospective observational study
Archives of Osteoporosis, 2020Co-Authors: Koun Yamauchi, Asami Adachi, Manato Kameyama, Masahiro Murakami, Yoshihiro Sato, Chisato Kato, Takayuki KatoAbstract:Lumbar BMD and functional Recovery in the acute period were independently strongly associated with subsequent new VCF after hospital conservative therapy for patients with new fragility VCFs. Functional Recovery was related with age, pain intensity during first month after hospitalization, VCF past history and multiple new VCFs. Purpose This study aimed to determine the factors independently associated with the subsequent vertebral compression fracture (VCF) after hospital conservative therapy in patients with new fragility VCFs and parameters related with functional Recovery in the acute period. Methods Subsequent VCF ( n = 37) was defined as patients who sustained a new VCF within 9 months after new VCF, whereas patients without a new VCF were classified as non-subsequent VCF ( n = 179). Logistic regression analysis was performed to determine independent factors associated with the subsequent VCF, including patients’ characteristics, past histories, number of new VCFs, bone mineral density (BMD), lumbar sagittal alignment, fractured vertebral body height, spine muscle mass, pain intensity, corset types, medications for osteoporosis and pain relief, Recovery Ratio of functional independence measure (FIM) and bone union. Correlation coefficients were accessed between the FIM Recovery Ratio and continuous variable parameters, while intergroup comparisons or analysis of variance was conducted to examine significant differences in the FIM Recovery Ratio for categorical variable parameters. Results Lumbar BMD, FIM Recovery Ratio at the first month after hospitalization and segmental Cobb angle were significantly independently associated with subsequent VCF (odds Ratio: 27.8, 9.6 and 1.1, respectively). The FIM Recovery Ratio was moderately negatively correlated with age and pain intensity and was significantly worse in patients with multiple new VCFs or past history of VCF. Conclusions Conservative therapies focused on lumbar BMD, functional Recovery and pain relief in the acute period may be useful in preventing subsequent VCF.
