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  • SAGE Publications  (11)
  • 1
    Online Resource
    Online Resource
    SAGE Publications ; 2012
    In:  Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine Vol. 226, No. 8 ( 2012-08), p. 623-630
    In: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, SAGE Publications, Vol. 226, No. 8 ( 2012-08), p. 623-630
    Abstract: In order to enhance the dexterity of surgical instruments in robotic-assisted minimally invasive surgery, the robot is generally configured so as to have a wrist. However, this configuration has a problem in that there is a coupling of the motions of the wrist and the end-effector. In this paper an improved surgical instrument is proposed that eliminates the coupled motion using a compensation mechanism. The design concept behind the compensation mechanism can be applied to other types of surgical instruments. The performance of the proposed surgical instrument is validated by mechanical performance testing and animal experiments, which indicate that the problem of the coupled motion is successfully solved and the instrument is able to perform surgical tasks.
    Type of Medium: Online Resource
    ISSN: 0954-4119 , 2041-3033
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2012
    detail.hit.zdb_id: 2032763-8
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  • 2
    Online Resource
    Online Resource
    SAGE Publications ; 2016
    In:  Advances in Mechanical Engineering Vol. 8, No. 6 ( 2016-06), p. 168781401665209-
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 8, No. 6 ( 2016-06), p. 168781401665209-
    Abstract: In new drilling conditions such as extended reach drilling or long horizontal well, to avoid large friction between drill string and wellbore or weigh on bit decreasing, a new drilling vibration tool (called antifriction oscillator) is presented in this article. For discussing its working mechanism and performance, first, the kinematics models are established based on the structure design parameter, and then the horizontal vibration models are presented according to drilling conditions. With the numerical example results, it can be concluded that the frequency of the flow area between the static and dynamic valve plates is proportional to the flow rate. Moreover, with the increasing size of static valve plate, the flow area is increasing while the total axial force is decreasing. Furthermore, according to the experiment test results with static valve plate hole diameter 35.56 mm, the vibration results are discussed by comparing with numerical example results, and it can verify the analysis models’ rationality and the calculation formulas’ correctness. The research results provide basis for theoretical research and field applications of drilling oscillator. Furthermore, by changing corresponding parameters, the research methods and models can also provide reference for the design of new methods or tools of drilling friction reduction or rate of penetration increasing technologies.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2501620-9
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  • 3
    In: Therapeutic Advances in Medical Oncology, SAGE Publications, Vol. 12 ( 2020-01), p. 175883592092382-
    Abstract: To compare the outcomes of GDPT [gemcitabine (G), cisplatin (D), prednisone (P), thalidomide (T)] versus CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone) in treating newly diagnosed PTCL (peripheral T-cell lymphoma). Methods: An open-label prospective clinical trial with 153 newly diagnosed PTCL patients conducted between January 2010 and December 2018 was designed. Patients were randomly assigned to the GDPT (77 cases) and CHOP (76 cases) groups. Patients in each group were further divided into four subgroups: PTCL, not otherwise specified (PTCL-NOS); anaplastic large cell lymphoma (ALCL), angioimmunoblastic T cell lymphoma (AITL), and other types subgroup, in accordance with pathological patterns. Based on expression of RRM1, TOP2A, TUBB3, and ERCC1, patients were divided into groups with high and low gene expression levels. Clinical characteristics, side effects, efficacy, progression-free survival (PFS), and overall survival (OS) were compared. Results: There were no significant differences in the basic clinical features or side effects between the GDPT and CHOP groups. The overall response rate (ORR) of the GDPT group was better than that of the CHOP group (66.3% versus 50.0%, p = 0.042), as was the complete remission (CR) rate (42.9% versus 27.6%, p = 0.049). Patients in the GDPT group had a longer PFS and OS than the CHOP group. The 4-year PFS and OS rates in the GDPT group were both superior to those in the CHOP group (63.6% versus 53.0% for PFS, p = 0.035; 66.8% versus 53.6% for OS, p = 0.039). In the GDPT group, the difference in CR between the four subgroups was statistically significant ( p = 0.046). In the CHOP group, differences in both CR and ORR among the four subgroups were statistically significant ( p  〈  0.001 and p = 0.005, respectively). There were also statistically significant differences in CR between patients treated with CHOP and GDPT in the PTCL-NOS subgroup, AITL subgroup, and the other types subgroup ( p = 0.015; p = 0.003; p = 0.005, respectively). The data also showed a significant difference in OS among the four subgroups within the GDPT group ( p = 0.001). The OS of AITL was shorter than that of the other three subgroups. Four subgroups of CHOP showed a significant difference in PFS ( p = 0.019). There was no statistical association between responses and the gene expression levels of RRM1, ERCC1, TUBB3, and TOP2A. Conclusion: The GDPT group had better response rates and prolonged patient PFS and OS. As a promising new regimen, GDPT is expected to become the first-line therapy for PTCL. New agents should be applied to patients who do not achieve good responses with previous treatment, such as those diagnosed with angioimmunoblastic T cell lymphoma. Trial registration: This open randomized prospective clinical trial was registered at ClinicalTrials.gov (NCT01664975).
    Type of Medium: Online Resource
    ISSN: 1758-8359 , 1758-8359
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2503443-1
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  • 4
    Online Resource
    Online Resource
    SAGE Publications ; 2018
    In:  Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Vol. 232, No. 23 ( 2018-12), p. 4312-4331
    In: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, SAGE Publications, Vol. 232, No. 23 ( 2018-12), p. 4312-4331
    Abstract: Flows in an intermediate turbine duct connecting low-pressure turbines and power turbines are very complex, affected by the upstream low-pressure turbine flow structures. Non-uniformities originating from the duct with struts also affect the power turbine inflow conditions, resulting in reduced efficiency. The present investigation is done to clarify the flow and loss mechanisms within the intermediate turbine duct and the power turbine. Steady and unsteady numerical investigations of the flow interaction between low-pressure turbine blade, intermediate turbine duct and power turbine vane were conducted. Effects of upstream low-pressure turbine blade on intermediate turbine duct flow fields and loss characteristics, and that of intermediate turbine duct with big and small struts on power turbine aerodynamics are explored. The generation and propagation of wake and secondary flows through the whole configuration are described. The fast Fourier transformation analyses of the flow in the low-pressure turbine blade, intermediate turbine duct and power turbine vane are also presented. Results from the steady and unsteady investigations show complex flow patterns resulted from blade–strut–vane flow interactions, which are not obtainable from intermediate turbine duct-only or power turbine-only simulations. The intermediate turbine duct has a great amplifying influence on the distorted inflow, and the inlet flow with upstream wakes and secondary flows introduces a high-loss area along the casing at intermediate turbine duct exit. Detailed results are presented and discussed for the flow physics and loss mechanisms as well as the unsteady flow evolution through the low-pressure turbine blade, intermediate turbine duct and power turbine vane.
    Type of Medium: Online Resource
    ISSN: 0954-4062 , 2041-2983
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2024890-8
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  • 5
    Online Resource
    Online Resource
    SAGE Publications ; 2024
    In:  Advances in Mechanical Engineering Vol. 16, No. 1 ( 2024-01)
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 16, No. 1 ( 2024-01)
    Abstract: To enhance the efficiency and load-carrying capacity of the jumping robot’s transmission system, the transmission characteristics of the planthopper hip gear were analyzed. The analysis revealed that the gear pair exhibited low transmission errors, high transmission efficiency, and significant torque capacity, making it suitable for high-speed, high-precision, and high-power density transmissions. A bionic design study of the jumping robot’s gear was conducted, drawing inspiration from the planthopper hip gear’s tooth shape and profile. A logarithmic spiral was assumed as the tooth profile based on its consistent pitch angle and curvature gradient characteristics. Parameters of the tooth profile of the bionic gear were calculated, and equations for the tooth surface were derived. A three-dimensional model of the bionic gear was constructed, and both its transmission efficiency and error were calculated. Using the finite element method, theoretical formulas for contact stress and bending stress in the bionic gear were deduced. The distribution characteristics of both bending and contact stress were analyzed, demonstrating that the bionic gear used in high-performance jumping robots possesses low transmission error, high transmission efficiency, and excellent contact strength, providing a theoretical foundation for enhancing their jumping capabilities.
    Type of Medium: Online Resource
    ISSN: 1687-8132 , 1687-8140
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2024
    detail.hit.zdb_id: 2501620-9
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  • 6
    Online Resource
    Online Resource
    SAGE Publications ; 2008
    In:  Journal of Reinforced Plastics and Composites Vol. 27, No. 4 ( 2008-03), p. 375-391
    In: Journal of Reinforced Plastics and Composites, SAGE Publications, Vol. 27, No. 4 ( 2008-03), p. 375-391
    Abstract: Four modified starches, including gelatinized starch (GS), crosslinked starch (CS), oxidized starch (OS) and esterified starch (ES), were blended with polyethylene-octene elastomer (POE) at 20 wt% starch content. The graft copolymer POE-g-MAH acted as a compatibilizer where 5 wt% was added to POE and various starch blends. The crosslinked starch was blended with POE in different proportions and conditioned at various relative humidities (RH), 11%, 32%, 43%, 75% and 100%, respectively until equilibrium to study the water absorption of POE/starch blends. Although different types of starch were used, the mechanical properties of each POE/starch blend were not significantly different. The compatibilizer had an obvious influence on the morphology and mechanical properties of each POE/starch blend. The starch dispersed in POE matrix better and the interfacial adhesion between starch and POE phase improved after adding the POE-g-MAH, also the tensile strength of POE/starch blends increased. With increasing starch content, both the tensile strength and elongation at break of POE/CS blends decreased. The water uptake of POE/CS blends increased with increasing time and starch content. The POE/CS blends without compatibilizer had higher water uptakes than those samples with compatibilizer. After equilibrium at different RH, the tensile strength of POE/CS blends decreased as RH increased, but the elongation at break increased with increasing RH.
    Type of Medium: Online Resource
    ISSN: 0731-6844 , 1530-7964
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2008
    detail.hit.zdb_id: 2051886-9
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  • 7
    Online Resource
    Online Resource
    SAGE Publications ; 2009
    In:  Journal of Reinforced Plastics and Composites Vol. 28, No. 3 ( 2009-02), p. 279-293
    In: Journal of Reinforced Plastics and Composites, SAGE Publications, Vol. 28, No. 3 ( 2009-02), p. 279-293
    Abstract: This study investigated the biodegradation of POE/starch and POE-g-MAH/starch composites in a natural soil environment for 6 months. Nonbiodegradable polyethylene-octene elastomer (POE) and its graft copolymer POE-g-MAH were blended with gelatinized waxy corn starch (GWCS) in different proportions. The weight loss, morphology and mechanical properties of the blend films were measured every month. Pure POE and POE-g-MAH specimens did not lose weight, while tensile strength and elongation at break only slightly changed in the soil, which indicated that pure POE and POE-g-MAH did not degrade in soil. With increasing starch content, the weight loss, tensile strength and elongation at break of POE/starch and POE-g-MAH/starch blend films reduced, as well as with increasing soil burial time, due to the biodegradation of starch. SEM photographs showed more holes and cracks with increasing starch content and burial time. The weight loss of the blends reduced evidently in the first 3 months, but much slower in the latter. Also, POE-g-MAH/starch blends showed better biodegradation than POE/starch blends.
    Type of Medium: Online Resource
    ISSN: 0731-6844 , 1530-7964
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2009
    detail.hit.zdb_id: 2051886-9
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  • 8
    Online Resource
    Online Resource
    SAGE Publications ; 2022
    In:  Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Vol. 236, No. 13 ( 2022-07), p. 7270-7281
    In: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, SAGE Publications, Vol. 236, No. 13 ( 2022-07), p. 7270-7281
    Abstract: In view of the problem that it is difficult to accurately obtain the crack initiation force required for the metal bar with V-shaped notch in the low-stress precision cropping, a new method for synchronous measurement of coupling AE parameters and stress–strain is proposed, and a corresponding test platform is also established. By analyzing the ringing count and RMS parameters of AE, it is found that the crack at the tip of V-shaped notch begins to appear at the boundary between the crack accumulation area and the plastic failure area. At the moment, the reasonable crack initiation force for metal bar with V-shaped notch can also be determined by coupling the value of strain. Based on it, a new constant loading curve based on the F R is built. The results show that by means of the constant loading curve, the crack initiation time and the area of bar transient breaking zone are reduced by 63.6% and 51.2%, respectively, compared with ones of the traditional linear loading methods. Further research based on XFEM shows that the initial crack depth is between 0.25mm and 0.4mm, and the cracking angle and the crack offset distance can also meet the precision cropping requirement, which provides a technical guarantee for truly improving the cropping quality.
    Type of Medium: Online Resource
    ISSN: 0954-4062 , 2041-2983
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2024890-8
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  • 9
    Online Resource
    Online Resource
    SAGE Publications ; 2021
    In:  Textile Research Journal Vol. 91, No. 21-22 ( 2021-11), p. 2551-2566
    In: Textile Research Journal, SAGE Publications, Vol. 91, No. 21-22 ( 2021-11), p. 2551-2566
    Abstract: Automatic detection of printing defect technology is significant for improving printing fabrics’ appearance and quality. In this research, we proposed an unsupervised printing defect detection method by processing the difference map between the test image and the reference image. Aimed at this, we adopted a content-based image retrieval (CBIR) method to retrieve the reference image, which includes an image database, a convolutional denoising auto-encoder (CDAE) and a hash encoder (HE): the elements of image database are extracted from only one defect-free sample image of the test fabric; the CDAE prevents the system being affected by the texture of the fabric and provides a reliable feature description of the patterns; the HE indexes the feature vectors to binary code while maintaining their similarity; both CDAE and HE are trained in an unsupervised manner. With the retrieved reference image, the defect is determined by applying the Tsallis entropy thresholding and opening operation on the difference map. The method can be implemented without labeled and defective samples, and without consideration of the periodical primitive of patterns. Experimental results demonstrate the effectiveness and efficiency of the proposed method in defect detection for printed fabrics with complex patterns.
    Type of Medium: Online Resource
    ISSN: 0040-5175 , 1746-7748
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2209596-2
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  • 10
    Online Resource
    Online Resource
    SAGE Publications ; 1999
    In:  Personality and Social Psychology Bulletin Vol. 25, No. 10 ( 1999-10), p. 1208-1219
    In: Personality and Social Psychology Bulletin, SAGE Publications, Vol. 25, No. 10 ( 1999-10), p. 1208-1219
    Abstract: A growing body of research suggests that cultures differ in the tendency to prefer dispositional or situational explanations for behavior. However, little work has examined whether cultural differences exist in the tendency to infer that people’s dispositions correspond to their behavior (the correspondence bias). Two experiments, one using the attitude attribution paradigm and one using the quizmaster paradigm, investigated the correspondence bias in individualist and collectivist cultures. As predicted, significant correspondence bias effects were found in both cultures. Moreover, no cultural difference emerged. Explanations and implications are discussed.
    Type of Medium: Online Resource
    ISSN: 0146-1672 , 1552-7433
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1999
    detail.hit.zdb_id: 2047603-6
    SSG: 5,2
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