排序方式: 共有29条查询结果,搜索用时 15 毫秒
21.
G. R. Somayajulu 《International Journal of Thermophysics》1988,9(4):567-575
Two new equations are proposed for the enthalpy of vaporization from the triple point to the critical point. One of these equations containing four parameters is exceptionally good for fitting the data. The other equation containing three parameters is quite adequate for fitting the data but it is exceptionally suited for interpolation when the data do not cover the entire range. These equations have been tested using the enthalpy of vaporization of water from the triple point to the critical point and are compared with other equations.Nomenclature
T
c
Critical temperature, K
-
T
t
Triple point, K
-
T
x
Any particular temperature, K
-
T
r
Reduced temperature
-
P
r
Reduced pressure
-
R
Gas constant
-
P
Vapor pressure
-
X
(T
c–T)/T
c
-
Y
(T
c–T)/T
-
X
x
(T
c–T)/(T
c–T
x)
-
X
t
(T
c–T)/(T
c–T
t)
-
H
vt
Enthalpy of vaporization at the triple point, kJ · mol–1
-
H
vx
Enthalpy of vaporization at any temperature x, kJ · mol–1
-
Z
v
Compressibilty factor of the saturated vapor
-
Z
1
Compressibilty factor of the saturated liquid Relative deviation = 100[Hv(obs)–Hv(cal)]/Hv(obsd) Standard deviation = { [H
v(obs)–H
v(cal)]2/(No. points — No. parameters)}0.5 相似文献
22.
John Paul Vargheese Somayajulu Sripada Judith Masthoff Nir Oren 《International journal of human-computer interaction》2016,32(3):190-214
Social isolation among older adults represents a significant societal challenge in which persuasion offers a potential solution. To develop a persuasive interactive system for this purpose, we conducted a modeling study with carers to discover how persuasion is used to encourage social interaction among older adults. From an analysis of the results, we identified and defined effective persuasive strategies grounded in theories of persuasion and developed a computational model for applying them. This article reports the findings from an evaluation of the generalizability of this model and presents a revised version based on these results. The article concludes with a discussion on possible domain-specific conceptual features between the model evaluated and the revised model developed. 相似文献
23.
24.
Advances in GML for Geospatial Applications 总被引:1,自引:0,他引:1
Chang-Tien Lu Raimundo F. Dos SantosJr Lakshmi N. Sripada Yufeng Kou 《GeoInformatica》2007,11(1):131-157
This paper presents a study of Geography Markup Language (GML), the issues that arise from using GML for spatial applications,
including storage, parsing, querying and visualization, as well as the use of GML for mobile devices and web services. GML
is a modeling language developed by the Open Geospatial Consortium (OGC) as a medium of uniform geographic data storage and
exchange among diverse applications. Many new XML-based languages are being developed as open standards in various areas of
application. It would be beneficial to integrate such languages with GML during the developmental stages, taking full advantage
of a non-proprietary universal standard. As GML is a relatively new language still in development, data processing techniques
need to be refined further in order for GML to become a more efficient medium for geospatial applications.
Chang-Tien(C.T.) Lu received the BS degree in Computer Science and Engineering from the Tatung Institute of Technology, Taipei, Taiwan, in 1991, the MS degree in Computer Science from the Georgia Institute of Technology, Atlanta, GA, in 1996, and the Ph.D. degree in Computer Science from the University of Minnesota, Minneapolis, MN, in 2001. He is currently an assistant professor in the Department of Computer Science at Virginia Polytechnic Institute and State University, and is the founding director of the Spatial Data Management Laboratory. His research interests include spatial database, data mining, data warehousing, geographic information systems, and intelligent transportation systems. Dr. Lu is also affiliated with Virginia Tech Civil and Environmental Engineering Department, Center for Geospatial Information Technology, and Virginia Tech Transportation Institute. Raimundo Dos Santos received a Bachelor’s Degree in Computer Science from the University of South Florida. He is currently a PhD. candidate in the Department of Computer Science at Virginia Polytechnic Institute and State University. His research focuses on Spatial Data Management, including retrieval, exchange, and processing of information for Geographic Information Systems and Location-Based Services. Other interests include Geography Markup Language (GML), and data visualization. Lakshmi N Sripada received an MS in Information Systems from Virginia Polytechnic and State University in 2004. Her research interests include Data Visualization, GML, and Geographic Information Systems. Yufeng Kou received a BS degree in Computer Science from Northwestern Polytechnic University, XiAn, China, in 1996, a MS degree in Computer Science from Beijing University of Post and Telecommunications in 1999. He is a PhD candidate in Computer Science Department, Virginia Polytechnic Institute and State University. His research interests include spatial data analysis, data mining, data warehousing, and Geographic Information Systems. 相似文献
Yufeng KouEmail: |
Chang-Tien(C.T.) Lu received the BS degree in Computer Science and Engineering from the Tatung Institute of Technology, Taipei, Taiwan, in 1991, the MS degree in Computer Science from the Georgia Institute of Technology, Atlanta, GA, in 1996, and the Ph.D. degree in Computer Science from the University of Minnesota, Minneapolis, MN, in 2001. He is currently an assistant professor in the Department of Computer Science at Virginia Polytechnic Institute and State University, and is the founding director of the Spatial Data Management Laboratory. His research interests include spatial database, data mining, data warehousing, geographic information systems, and intelligent transportation systems. Dr. Lu is also affiliated with Virginia Tech Civil and Environmental Engineering Department, Center for Geospatial Information Technology, and Virginia Tech Transportation Institute. Raimundo Dos Santos received a Bachelor’s Degree in Computer Science from the University of South Florida. He is currently a PhD. candidate in the Department of Computer Science at Virginia Polytechnic Institute and State University. His research focuses on Spatial Data Management, including retrieval, exchange, and processing of information for Geographic Information Systems and Location-Based Services. Other interests include Geography Markup Language (GML), and data visualization. Lakshmi N Sripada received an MS in Information Systems from Virginia Polytechnic and State University in 2004. Her research interests include Data Visualization, GML, and Geographic Information Systems. Yufeng Kou received a BS degree in Computer Science from Northwestern Polytechnic University, XiAn, China, in 1996, a MS degree in Computer Science from Beijing University of Post and Telecommunications in 1999. He is a PhD candidate in Computer Science Department, Virginia Polytechnic Institute and State University. His research interests include spatial data analysis, data mining, data warehousing, and Geographic Information Systems. 相似文献
25.
K. Venkateswara Rao B. Panduranga Rao G. Siva Rami Reddy B. A. R. Somayajulu S. D. Thirumala Rao 《European Journal of Lipid Science and Technology》1966,68(9):746-748
Sludges obtained as tank settlings from solvent-extracted rice bran oil have been shown to be rich sources of wax and fatty acids. The wax content is variable, being about 18% in one sample and about 39% in a second sample of sludge. The wax was bleached to light colour. The crude wax shows good compatibility with other types of waxes. The oil fraction of sludges is high in free fatty acids (over 70%), about three fourth of which could be vacuum-distilled directly to yield light-coloured fatty acids. 相似文献
26.
Harihar Singh M. R. Somayajulu R. Bhaskara Rao K. R. Meghasyam 《Propellants, Explosives, Pyrotechnics》1991,16(3):115-118
Effect of addition of carbon in the form of graphite and carbolac on the combustion characteristics of Magnesium-Sodium nitrate propellant has been studied. Results indicated that the burning rate of the propellant increased significantly by the addition of graphite upto 2%. Thermal decomposition studies revealed that the graphite particles in addition to its absorption of thermal energy being an inert material react with the decomposed products of the sodium nitrate just above the burning surface of the propellant for the exothermic heat release. This heat release which is high at low concentration of graphite is seen causing high burning rate. Any further increase in graphite concentration beyound 2% reduces the burning rate as the thermal energy absorption exceeds the heat release at the burning surface. When carbon in the form of carbolac was used in the composition reactive species diffuse out prior to the sample ignition without participating in the combustion thus reduces the burning rate. The heat of reaction data supported the suggested mechanism. 相似文献
27.
Harihar Singh M. R. Somayajulu R. Bhaskar Rao 《Propellants, Explosives, Pyrotechnics》1988,13(2):52-54
Suitability of a number of metal based igniter compositions have been studied for magnesium based fuel rich propellant. Igniter compositions have been tested in closed vessel for evaluation of ignition pressure output and impetus. Heat energy values were determined calorimetrically in a closed bomb. Vented vessel study was carried out in a test motor for assessing relative behaviour and to select a suitable composition. Compositions containing magnesium powder and potassium nitrate were found to give satisfactory ignition to the propellant. 相似文献
28.
D. R. S. Somayajulu C. N. Murthy D. K. Awasthi N. V. Patel M. Sarkar 《Bulletin of Materials Science》2001,24(4):397-400
High-energy MeV ions from accelerators are known to produce drastic modifications in polymers. The typical effects include chain scissions, crosslinks, molecular emission and double bond formation. Poly(methyl methacrylate) was doped with Fe(III) and irradiated with 95 MeV O7+ ions.57Fe-Mössbauer studies were done on the doped samples before and after irradiation. Before irradiation, no Mössbauer absorption was observed. The irradiated samples showed a good Mössbauer absorption, which seems to indicate that there is a significant interaction between the metal ion and the polymer matrix. Two possibilities exist at these doses (~ 22 × 1012 ions/cm): Fe(III) ions may be bridging the various polymer segments through crosslinking or amorphization of the sample leading to Fe-C bonding. Studies of FTIR, conductivity and glass transition temperatures on these samples support these observations. 相似文献
29.
Jong-Kook Kim Sameer Shivle Howard Jay Siegel Anthony A. Maciejewski Tracy D. Braun Myron Schneider Sonja Tideman Ramakrishna Chitta Raheleh B. Dilmaghani Rohit Joshi Aditya Kaul Ashish Sharma Siddhartha Sripada Praveen Vangari Siva Sankar Yellampalli 《Journal of Parallel and Distributed Computing》2007
In a distributed heterogeneous computing system, the resources have different capabilities and tasks have different requirements. To maximize the performance of the system, it is essential to assign the resources to tasks (match) and order the execution of tasks on each resource (schedule) to exploit the heterogeneity of the resources and tasks. Dynamic mapping (defined as matching and scheduling) is performed when the arrival of tasks is not known a priori. In the heterogeneous environment considered in this study, tasks arrive randomly, tasks are independent (i.e., no inter-task communication), and tasks have priorities and multiple soft deadlines. The value of a task is calculated based on the priority of the task and the completion time of the task with respect to its deadlines. The goal of a dynamic mapping heuristic in this research is to maximize the value accrued of completed tasks in a given interval of time. This research proposes, evaluates, and compares eight dynamic mapping heuristics. Two static mapping schemes (all arrival information of tasks are known) are designed also for comparison. The performance of the best heuristics is 84% of a calculated upper bound for the scenarios considered. 相似文献