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  • 1
    Electronic Resource
    Electronic Resource
    External watchman routes (1994)
    Springer
    The visual computer 10 (1994), S. 474-483 
    Details
    ISSN: 1432-2315
    Keywords: Watchman routes ; Visibility ; Art gallery problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We consider the problem of finding a shortest watchman route from which the exterior of a polygon is visible (external watchman route). We present an O (n 4 log logn) algorithm to find shortest external watchman routes for simple polygons by transforming the external watchman route problem to a set of internal watchman route problems. Also, we present faster external watchman route algorithms for special cases. These include optimal O (n) algorithms for convex, monotone, star and spiral polygons and an O (n log logn) algorithm for rectilinear polygons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01910637
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  • 2
    Electronic Resource
    Electronic Resource
    Computational methods for evaluating swept object boundaries (1994)
    Springer
    The visual computer 10 (1994), S. 266-276 
    Details
    ISSN: 1432-2315
    Keywords: Swept objects ; Sweep rules ; Boundary evaluation ; Volume modeling ; Region modeling ; Body modeling ; Pen-stroke modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Many systems support the design of two-dimensional (2D) regions and three-dimensional (3D) volumes by sweeping a generator contour over a spine. Well-established and widely used rendering systems accept high-level boundary descriptions of regions and solids but not in the contour-spine form. Hence the swept object design specification must be such as to lend itself to efficient evaluation of a compact and high-level boundary description. In this paper, we identify a sufficiently general class of swept objects and classify the sweep rules. We also present computational methods for directly evaluating the boundary representation which implicitly simulate the sweep process. The boundary is generated as a set of piecewise curves/surfaces in a compact form suitable for direct input to rendering systems like Post-Script(R) in 2D and Renderman(R) in 3D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01901583
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  • 3
    Electronic Resource
    Electronic Resource
    An Approximation Algorithm for Alignment of Multiple Sequences using Motif Discovery (1999)
    Springer
    Journal of combinatorial optimization 3 (1999), S. 247-275 
    Details
    ISSN: 1573-2886
    Keywords: multiple sequence alignment ; alignment number ; protein sequences ; motif discovery ; MAX SNP hard ; approximate algorithm ; set covering problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Given a set of N sequence, the Multiple Sequence Alignment problem is to align these N sequences, possibly with gaps, that brings out the best commonality of the N sequences. The quality of the alignment is usually measured by penalizing the mis-matches and gaps, and rewarding the matches with appropriate weight functions. However for larger values of N, additional constraints are required to give meaningful alignments. We identify a user-controlled parameter, an alignment number K (2 ≤ K ≤ N): this additional requirement constrains the alignment to have at least K sequences agree on a character, whenever possible, in the alignment. We identify a natural optimization problem for this approach called the K-MSA problem. We show that the problem is MAX SNP hard. We give a natural extension of this problem that incorporates “biological relevance” by using motifs (common patterns in the sequences) and give an approximation algorithm for this problem in terms of the motifs in the data. MUSCA is an implementation of this approach and our experimental results indicate that this approach is efficient, particularly on large numbers of long sequences, and gives good alignments when tested on biological data such as DNA and protein sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009841927822
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of finite-buffer multi-server queues with group arrivals: GIX/M/c/N (2000)
    Springer
    Queueing systems 36 (2000), S. 125-140 
    Details
    ISSN: 1572-9443
    Keywords: bulk arrival ; finite-buffer ; multi-server ; queue ; waiting time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we analyse a multi-server queue with bulk arrivals and finite-buffer space. The interarrival and service times are arbitrarily and exponentially distributed, respectively. The model is discussed with partial and total batch rejections and the distributions of the numbers of customers in the system at prearrival and arbitrary epochs are obtained. In addition, blocking probabilities and waiting time analyses of the first, an arbitrary and the last customer of a batch are discussed. Finally, some numerical results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019179119172
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidations by iron(VI). Kinetic study of uncatalysed and osmium(VIII) catalysed oxidation of dimethyl sulphoxide in alkaline medium (1989)
    Springer
    Transition metal chemistry 14 (1989), S. 165-168 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Uncatalysed and OsVIII-catalysed oxidation of dimethyl sulphoxide (DMSO) by potassium ferrate [FeVI] has been studied in alkaline medium in the 9.8–11.9 pH range, in the presence of IO 4 − as a stabilizing agent. The order in [FeVI] and [DMSO] was found to be unity for the uncatalysed reaction and zero and fractional respectively for the catalysed reaction. The [OsVIII] order was unity in the catalysed reaction. The rate of oxidation decreased with increase in pH and the order in [H+] was fractional for the uncatalysed oxidation. However in the catalysed oxidation, the rate at first decreased and then increased with increase in pH. The effect of changing [IO 4 − ] and [buffer] on the oxidation rate was negligible in both cases. Suitable mechanisms consistent with the observed kinetics have been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043787
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  • 6
    Electronic Resource
    Electronic Resource
    The impacts of tourism on the environment of Mussoorie, Garhwal Himalaya, India (2000)
    Springer
    The environmentalist 20 (2000), S. 249-255 
    Details
    ISSN: 1573-2991
    Keywords: tourist trends ; tourist activities ; impacts on environment ; scientific tourism ; Mussoorie Himalaya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Mussoorie, a hill resort in the Garhwal Himalaya reveals the changing trends and impacts of tourist activity on its environment. This study was carried out during 1993–1994 and it showed that while Mussoorie had a permanent residential population of 25400 during the winter months, in the peak tourist season of May and June the population exceeded 200000 per month. Because of this huge influx of tourists the demand for lodges/hotels and other related infra-structure and super-structure facilities and amenities in the area was enormous, and it imposed a great stress on the natural environment. The data collected showed that from 1958 to 1988 the number of tourists had increased gradually but that from 1989 tourism in the town escalated following the political disturbances in the Kashmir Valley. The main purpose of the tourism was recreation (80%). It was recorded that the greatest number (60%) of the tourists were middle aged, 53% of the tourists worked in professional services. The majority of the tourists preferred to use the indigenous hotels and about 96% of the tourists used a private vehicle rather than public transport. The installation of modern tourist related facilities and infra-structure has led to the aesthetic degradation of the landscape. Tourist facility development is often disorderly and scattered. To reduce the traffic to Mussoorie town it is suggested that some nearby places like Dhanolti and Park estate should be developed for tourism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006760015997
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  • 7
    Electronic Resource
    Electronic Resource
    Changes in nutritional value of guava fruits infected by major post-harvest pathogens (1989)
    Springer
    Plant foods for human nutrition 39 (1989), S. 311-315 
    Details
    ISSN: 1573-9104
    Keywords: Psidium guajava ; post-harvest pathogens ; nutritional changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Post-infection changes in ascorbic acid, sugars, proteins and phenols were studied in guava fruits infected by major post-harvest pathogens which in order of importance wereColletotrichum gloeosporioides, (Penz.),Botryodiplodia theobromae, Pat.,Rhizopus arrhizus Fischer.,Phomopsis psidii Nag Raj and Ponnappa apud Ponnappa and Nag Raj, andPestalotiopsis versicolor (Speg.) Steyaert. Contents of ascorbic acid, sugars and proteins declined in the fruits infected byBotryodiplodia theobromae, Colletotrichum gloeosporioides, Pestalotiopsis versicolor, Phomopsis psidii andRhizopus arrhizus. Total phenols increased in fruits infected byPestalotiopsis versicolor andRhizopus arrhizus while reverse was observed in fruits infected by other pathogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01092067
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  • 8
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    Un-segregated waste disposal: an alarming threat of antimicrobials in surface and ground water sources in Delhi (2018)
    Springer
    Details
    Publication Date: 2018-08-22
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 9
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    Comparative study of polystyrene/chemically modified wheat straw composite for green packaging application (2019)
    Springer
    Details
    Publication Date: 2019-05-06
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
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    Assessment of Forest Carbon Stocks in the Himalayas: Does Legal Protection Matter? (2014)
    Springer
    Details
    Publication Date: 2014-08-19
    Print ISSN: 1873-7617
    Electronic ISSN: 1873-7854
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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