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Search Results: 1 - 10 of 7369 matches for " Akinchan Das "
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A Novel Radio over Fiber System for Long Haul Single-Mode-Fiber Transmission
Ardhendu Sekhar Patra,Anindya Sundar Das,Banibrata Bag,Akinchan Das
International Journal of Soft Computing & Engineering , 2013,
Abstract: We have proposed and demonstrated a novel architecture of a radio over fiber (RoF) system in this paper. In this downlink system, the base band data signals are carried by the optical millimeter-wave generated at the central station and converted to the electrical RF signal by a converter at the base station before we distribute them through antenna. Here we generate and transmit the optical millimeter-wave by using external modulation technique and carrier suppression method. The performance is investigated by the good eye diagram and the significantly low BER at different lengths of the single mode fiber (SMF).
A baby chooses to emerge out from the posterior cervical tear in a prostaglandin induced labor
Geeta Gurung,Sapana Amatya,Archana Amatya,Akanchya Rana,Ashma Rana,Akinchan Kafle
Nepal Journal of Obstetrics and Gynaecology , 2008, DOI: 10.3126/njog.v3i2.10835
Abstract: A case is described where a live baby chooses to come out, tearing apart the posterior cervix as a result of effective uterine contractions in association with closed external cervical os in a prostaglandin E2 induced, postdated pregnancy in a primigravida with neonatal survival. DOI: http://dx.doi.org/10.3126/njog.v3i2.10835 Nepal Journal of Obstetrics and Gynaecology Vol.3(2) 2008; 57-58
In Vitro Somatic Embryogenesis in Some Oil Yielding Tropical Tree Species  [PDF]
Premananda Das
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.22023
Abstract: Somatic embryogenesis was achieved in two oil yielding tropical tree species i.e. Simarouba glauca & Azadirachta indica using immature zygotic embryos as explants on Murashige and Skoog (MS) medium supplemented with 0.5 – 1.5 mg/l benzylaminopurine (BA) and 2.0 - 3.0 mg/l NAA (1-napthaleneacetic acid) or 2, 4-D (2,4-dichlorophenoxyacetic acid) and 3% sucrose. MS medium containing 1.0 mg/l BA and 2.0 mg/l NAA was noted to be the most effective in inducing friable embryogenic callus (FEC) in Simarouba glauca; the number of somatic embryos per culture varied in MS medium supplemented with 1.0 – 1.5 mg/l BA and 1.0 mg/l NAA. In Azadirachta indica, somatic embryos developed on MS medium supplemented with 0.5 mg/l BA and 1.5 – 2.0 mg/l 2,4-D which were in various shapes and sizes after the first subculture on MS medium supplemented with 0.25 mg/l abscisic acid. The somatic embryos which developed shoots were isolated and rooted in 1/2 strength MS medium supplemented with 0.25 mg/l abscisic acid and 2% sucrose. About 25% of embryos germinated within 20 days of culture in case of Simarouba glauca and 62% in Azadirachta indica. The somatic embryo-derived plantlets were transferred to the field after being hardened in the climate controlled hardening chamber.
Besicovitch-Eggleston Function  [PDF]
Manav Das
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.15048
Abstract: In this work we introduce a function based on the well-known Besicovitch-Eggleston sets, and prove that the Hausdorff dimension of its graph is 2.
Quantized Energy Momentum and Wave for an Electromagnetic Pulse—A Single Photon inside Negative Refractive Indexed Media  [PDF]
Shantanu Das
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.212183
Abstract: An Electromagnetic (EM) radiation in dispersion less free space vacuum is represented by a photon, with corpuscular and wave nature. The discussions, for the past century aimed at the nature of photon inside a media having dispersion in the refraction property, other than free space. What about its nature if the space be of refractive index which is negative, is discussed in this paper. We call mechanical momentum, wave-momentum, and try to match our present theories with intriguing property of this ‘photon’ or pulse carrying EM energy packet, and more so we try to find its property energy, momentum inside a media a positive refractive media, and if the media show a negative refractive index behavior, then these queries are profound, and suitable explanations to these classical concepts of corpuscular-wave nature of photon inside these media are quest for the scientists dealing with these materials having negative index of refraction. Here some of this counterintuitive nature of corpuscular-wave nature of photon inside negative indexed material is brought out, with possible ‘new definition’ of its ‘wave-momentum’, the concept of ‘reactive energy’ inside negative indexed material, along with possible ‘new wave equation’. These definitions and expressions of ‘wave-momentum’ and ‘reactive energy’ pertaining to negative indexed material are new and discussed and derived by classical means.
Is There Chaos in Inflation Data?  [PDF]
Pritha Das
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.25026
Abstract: Economic indicators are snippets of financial and economic data published regularly by governmental agencies and the private sector. An exchange rate represents the value of one currency in another and it fluctuates over time. ForEx rates are affected by many highly correlated economic, political and even psychological factors. It was observed that changes in the exchange rate are related to news in the fundamentals which cover Inflation for the country concerned. In a series of work, we investigated and confirmed the chaotic property of ForEx Rates of several countries. In this perspective, we concentrate on nonlinear data analysis of inflation data of nine countries. We find existence of chaos in inflation data for some countries.
Revisiting the Curie-Von Schweidler Law for Dielectric Relaxation and Derivation of Distribution Function for Relaxation Rates as Zipf’s Power Law and Manifestation of Fractional Differential Equation for Capacitor  [PDF]
Shantanu Das
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.812120
Abstract: The classical power law relaxation, i.e. relaxation of current with inverse of power of time for a step-voltage excitation to dielectric—as popularly known as Curie-von Schweidler law is empirically derived and is observed in several relaxation experiments on various dielectrics studies since late 19th Century. This relaxation law is also regarded as “universal-law” for dielectric relaxations; and is also termed as power law. This empirical Curie-von Schewidler relaxation law is then used to derive fractional differential equations describing constituent expression for capacitor. In this paper, we give simple mathematical treatment to derive the distribution of relaxation rates of this Curie-von Schweidler law, and show that the relaxation rate follows Zipf’s power law distribution. We also show the method developed here give Zipfian power law distribution for relaxing time constants. Then we will show however mathematically correct this may be, but physical interpretation from the obtained time constants distribution are contradictory to the Zipfian rate relaxation distribution. In this paper, we develop possible explanation that as to why Zipfian distribution of relaxation rates appears for Curie-von Schweidler Law, and relate this law to time variant rate of relaxation. In this paper, we derive appearance of fractional derivative while using Zipfian power law distribution that gives notion of scale dependent relaxation rate function for Curie-von Schweidler relaxation phenomena. This paper gives analytical approach to get insight of a non-Debye relaxation and gives a new treatment to especially much used empirical Curie-von Schweidler (universal) relaxation law.
Endometriosis encountered in a primigravida and a primipara at caesarean section: Report of two cases
Neeva Ojha,Akinchan Kafle,Poonam Koirala,Isha Shrestha,Savana Sharma,Sapana Amatya,Seeta Ghimire,Ashma Rana,Geeta Gurung
Nepal Journal of Obstetrics and Gynaecology , 2008, DOI: 10.3126/njog.v3i2.10836
Abstract: Two cases of posterior uterine surface endometriosis were found at caesarean section in primigarvida and primipara consecutively. These cases are reported to convey the importance of Depo-Provera (depot medroxy progesterone), a three monthly injectable progesterone during the immediate post partum period to avoid the complication that may arise from the surrounding endometriotic deposits during the puerperium and afterwards. DOI: http://dx.doi.org/10.3126/njog.v3i2.10836 Nepal Journal of Obstetrics and Gynaecology Vol.3(2) 2008; 59-61
Combustion and Ball Milled Synthesis of Rare Earth Nano-Sized Ceria Powder  [PDF]
Ranjan Sen, Siddhartha Das, Karabi Das
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.25054
Abstract: This paper reports a study on nanocrystalline ceria powder prepared by high energy ball-milling and combustion synthesis methods. The combustion synthesis was carried out using ceric ammonium nitrate as oxidizer and citric acid, glycine or citric acid plus glycine as fuel. The minimum crystallite size of ceria powder is obtained by combustion synthesis of ceric ammonium nitrate and citric acid. The ceria powder produced by combustion synthesis of ceric ammonium nitrate and citric acid and glycine has less agglomeration of particles than other techniques.
How to Reap the Induced Technological Bonus? A Mechanism and Illustrative Implementation  [PDF]
Gouranga G. Das
Modern Economy (ME) , 2010, DOI: 10.4236/me.2010.12008
Abstract: Exogenous technical progress can have uneven impacts on productivity contingent on absorptive capacity, structural congruence and trade intensity. The paper illustrates the role of enabling behind-the-border factors for effective absorption and is pertinent for discussing issues like ‘Europe 2020’or Lisbon strategy for inclusive growth. Drawing on our model, we illustrate that the capture-parameter is the propellant force for effective assimilation of foreign technology of recent vintage. The capture parameter is the outcome of endogenous decision-making process. The ‘productivity bonus’ mechanism leaves room for changing the results via skill-mix composition. However, it awaits implementation in a large-scale economy-wide modeling framework for further extension.
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