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排序方式: 共有59条查询结果,搜索用时 15 毫秒
21.
Abstract The compliance of an integrated approach, principal component analysis (PCA), coupled with Tagu chi's robust theory for simultaneous optimization of cor related multiple responses of wire electrical discharge machining (WEDM) process for machining SiCp rein forced ZC63 metal matrix composites (MMCs) is investi gated in this work. The WEDM is proven better for its efficiency to machine MMCs among others, while the particulate size and volume percentage of SiCp with the composite are the utmost important factors. These improve the mechanical properties enormously, however reduce the machining performance. Hence the WEDM experiments are conducted by varying the particulate size, volume fraction, pulseon time, pulseoff time and wire tension. In the view of quality cut, the most important performance indicators of WEDM as surface roughness (Ra), metal removal rate (MRR), wire wear ratio (WWR), kerf (Kw) and white layer thickness (WLT) are measured as respon ses. PCA is used as multiresponse optimization technique to derive the composite principal component (CPC) which acts as the overall quality index in the process. Consequently, Taguchi's S/N ratio analysis is applied to optimize the CPC. The derived optimal process responses are confirmed by the experimental validation tests results. The analysis of vari ance is conducted to find the effects of choosing process variables on the overall quality of the machined component.The practical possibility of the derived optimal process conditions is also presented using SEM. 相似文献
22.
Daphne Pan Gary S. H. Tan Kiruthika Ragupathi Krishna Booluck Rita Roop Yuen K. Ip 《Research in higher education》2009,50(1):73-100
Considerable work has been done on student evaluation of teaching/teachers, but reservations remain about its use for summative
purposes. Student ratings are not universally accepted as being reliable, nor can they provide really meaningful information.
Qualitative comments can provide a better understanding but they tend not to be user-friendly from lack of structure and connectedness.
This study attempts to devise a method for ‘quantifying’ students’ comments to increase their usefulness in complementing/confirming
ratings. The quantified results enable the profile construction of what students regard as an effective/ineffective teacher,
and enable identification of strengths and weaknesses. Our findings counter some commonly held assumptions, including those
which held that high ratings are dependent on small class size and ‘dumbing down’ of courses and the consequent expectation
of high grades. The findings also indicate that students value teaching quality more than teacher characteristics, suggesting
their ability to make valid judgments about teaching effectiveness.
相似文献
Daphne PanEmail: |
23.
The extant literature shows that the connection between KM strategy and business strategy and business strategy and IT strategy has been extensively studied. However, the link between KM strategy and IT strategy remains unclear. To better understand how KM strategy influences IT strategy and vice versa within the context of business strategy, we synthesize the literature and contribute to the conceptualization of a triadic connection of the influences between business, KM and IT strategies and its deeper understanding in determining efficacy of knowledge use in organizations. 相似文献
24.
This article describes a challenging problem concerning a neutron under gravity that was posed as a theoretical problem in
the 36th International Physics Olympiad held in Salamanca, Spain from July 3–12, 2005. The Olympiad marked India’s eighth
foray into this exciting event where seventyfive nations participated. Our performance was a success and all five student
members of the team secured medals which included two gold, two silver and one bronze medals. 相似文献
25.
26.
Janardan Krishna Yadav Deepika Chandra Verma Srinivas Jangirala Shashi Kant Srivastava 《The Journal of High Technology Management Research》2021,32(1):100404
The concept of smart tourism remains fuzzy when it comes to practice because of the lack of clarity on the roles and responsibilities of stakeholders in addition to complex institutional ecosystem that exist within the tourism industry. Further, trust and safety of the data generated due to the advancement of smart tourism in varied institutional arrangements pose huge challenges. Extant literature proposes that the application of decentralized ledger promises possible solutions to most of these problems due to the inherent features of the Blockchain technology. This suggestion raises two practical questions. First, does the sophisticated additional layer adds complexity to its practical application? Second, will the suggested solutions really lead to a win-win for all the stakeholders involved? In this study, we use Ostrom's action arena to examine the exchanges (information, contractual and monetary) between various stakeholders in a BCT enabled smart tourism of a Blockchain enabled tourism industry to answer these two questions. 相似文献
27.
Despite the promise of broadband to improve the lives of persons with disabilities, there are wide disparities in access and usage between disabled and nondisabled populations. This article examines ten case studies of policies and programs promoting ICT and broadband access for persons with disabilities in the leading economies of the Asia-Pacific region, in order to identify factors behind programs that succeed on the basis of effectiveness and cost efficiency. 相似文献
28.
Neeraja Kunireddy Rachel Jacob Siraj Ahmed Khan B. Yadagiri K. S. S. Sai Baba I. Rajendra Vara Prasad Iyyapu Krishna Mohan 《Indian journal of clinical biochemistry : IJCB》2018,33(4):406-413
Systemic Lupus Erythematosus is an autoimmune disease with female preponderance. Anemia is found in 50% of Systemic Lupus Erythematosus patients. This is a cross sectional case control study with 30 female Systemic Lupus Erythematosus patients having inflammation associated anemia (Hemoglobin < 10.0 gm/dl) and 30 age matched controls with the aim to measure serum hepcidin and ferritin levels, correlate and study their role as homeostatic regulators of iron metabolism and utility as markers. Serum transferrin, ferritin, iron, total iron binding capacity, hsCRP, liver enzymes and renal parameters were analyzed by using automated analyser. Hepcidin levels were estimated by Sandwich-ELISA method. There was significant decrease in Iron (p < 0.0001), Iron Binding capacity (p < 0.0001), Transferrin (p < 0.0001) in patients, and a significant increase in inflammatory markers: hs-CRP (p < 0.0001), ESR (p < 0.0001) compared to controls. Significant increase in both Hepcidin (p < 0.0001) and Ferritin (p < 0.0001) was observed in patients with significant positive correlation (r = 0.711) with each other. Additionally, ferritin and hepcidin significantly positively correlated with hs-CRP and ESR (r = 0.526, 0.735); (r = 0.427, 0.742) respectively. Negative correlation with hemoglobin, iron, total iron binding capacity and transferrin with hepcidin (r = ? 0.80, ? 0.307, ? 0.553, ? 0.584) and ferritin (r = ?0.722, ? 0.22, ? 0.654, ? 0.728) was observed respectively. On ROC analysis both hepcidin and ferritin has sensitivity of 96.7%, specificity of 100% at cut-off values of 110 and 49 respectively. AUC of hepcidin was 0.993 and ferritin was 0.978. We have established a positive linear correlation between Hepcidin and Ferritin levels in disease activity and the changes correlated with the inflammatory state and anemia in patients, making them important mediators and potential markers of inflammation associated anemia. 相似文献
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30.
We demonstrate an evaporation-based microfluidic strategy to produce oil-free cell containing hydrogel particles. Perfluoro-n-pentane, which is used as the continuous oil phase to generate cell-containing hydrogel (Extracel) particles, is removed at an elevated temperature. Human colon cancer cells (HCT116) encapsulated in the hydrogel particles show higher viability than cells encapsulated in particles that are produced via a non-evaporative oil phase. In addition, single HCT116 cells can be cultured for a week in such particles and respond to inflammatory stimuli, highlighting the potential applications of the developed strategy for 3D cell culture, drug testing, and cell-based drug delivery. 相似文献