2,921 research outputs found
Data for Gupta et al., "Estimating the Meridional Extent of Adiabatic Mixing in the Stratosphere using Age-of-Air", JGR:Atmospheres,
No full textModel data and post-processed data supporting the creation of the manuscript "Estimating the Meridional Extent of Adiabatic Mixing in the Stratosphere using Age-of-Air" submitted to JGR:Atmospheres in August 2022.
1) The netCDF files created through post-processing of full model data in FORTRAN are shared in the /data/ directory. These file contains the zonal mean circulation statistics based on Gupta et al. (2020), age-of-air transport diagnostics based on Linz et al. (2021), and the novel \Gamma-\Theta circulation streamfunction introduced in this study. The /data/ directory also contains MATLAB .mat data files for the transport diagnostics obtained from WACCM. 150 days of actual GFDL-FV3 model data in the northern hemisphere, between 0.1 hPa-500 hPa pressure levels is also provided to support external computations and validation.
2) The Jupyter notebook used for final computation and figures production is provided in .ipynb, .html and .pdf formats in /code/. All the files referred to in the notebook are stored in the /data/ directory.
Corresponding author : Aman Gupta, [email protected], [email protected], [email protected]
Corrigendum: Capital Inflows and House Prices: Aggregate and Regional Evidence from China
No full textIn the paper ‘Capital Inflows and House Prices: Aggregate and Regional Evidence from China’ by H. An, et al., printed in the December 2016 issue, there was a missing acknowledgement section for funding resources.
On page 451, the acknowledgement section should appear after the corresponding information as:
“Correspondence: Rakesh Gupta, Department of Accounting, Finance and Economics, Griffith Business School, Griffith University, Nathan Campus QLD 4111. [email protected]
*This work was financially supported by the Humanities and Social Science Foundation of Ministry of Education of China (16YJA790001).”
The author apologises for this error and any confusion it may have caused.No Full Tex
First person – Akash Gupta
No full textFirst Person is a series of interviews with the first authors of a selection of papers published in Biology Open, helping early-career researchers promote themselves alongside their papers. Akash Gupta is first author on ‘A novel and cost-effective ex vivo orthotopic model for the study of human breast cancer in mouse mammary gland organ culture’, published in BiO. Akash conducted the research described in this article while a PhD Scholar in Rajendra Mehta's lab at IIT Research Institute, Chicago, USA. He is now an assistant research scientist in the lab of Syreeta L. Tilghman at the University of Arizona, Department of Medicine, Tucson, USA, investigating drug efficacy modeling using human organoids culture for the treatment of cancers
Engineering materials : research, applications and advances / author, K.M. Gupta.
No full text"A CRC title."Includes bibliographical references and index.596 p.
Energy-Efficient Data Fusion Techniques for Wireless Sensor Networks
No full textWireless sensor networks (WSNs) are finding increasing use in applications such as environmental monitoring, military surveillance, and healthcare due to their low cost and ease of deployment. However, the nodes in a conventional WSN are constrained by their limited on-board battery energy capacity. Hence, devising energy-efficient schemes to increase the lifetime of WSNs is an active and important area of research.
Opportunistic transmission schemes enhance the lifetime of WSNs by curtailing the number of transmissions by the nodes. However, this causes an unwelcome degradation in the performance of the WSN. Energy harvesting (EH), on the other hand, is an alternate solution that altogether eliminates the problem of limited lifetime in WSNs. In it, the nodes can replenish their energy buffers by harvesting energy from renewable sources. However, since the energy available is random, the nodes can occasionally be unavailable due to lack of energy, which affects performance.
In this thesis, we study the performance of energy-efficient opportunistic transmission schemes for estimation and detection problems using WSNs. First, we study these schemes for parameter estimation with EH WSNs. For a general model in which the nodes experience independent and non-identical fading and the EH process at a node is stationary and ergodic, we study two important classes of channel-based opportunistic transmission schemes, namely, censoring and opportunistic subset selection. We provide lower bounds on the mean squared error for them and show that the associated trade-offs are very different from that observed in conventional WSNs.
Next, we study a detection problem. In conventional WSNs, ordering transmissions based on node log-likelihood ratios (LLRs) reduces the number of nodes that transmit and yet achieves the same detection error probability as the conventional unordered transmissions scheme (UTS) in which all nodes transmit. However, this breaks down in EH WSNs when nodes can be unavailable due to lack of energy. For the Bayesian detection framework, we propose a novel scheme that addresses this challenge for the general case in which the LLRs are bounded and have a continuous distribution function. For truncated Gaussian statistics, we then propose a novel refinement that requires even fewer transmissions and that simultaneously lowers the detection error probability when the nodes miss their transmissions. The proposed schemes also achieve a lower error probability than sequential detection.
In the last part of our work, we study the detection problem for the general, practically relevant scenario in which the measurements at the sensor nodes are spatially correlated. We show that since the observations at the sensor nodes are dependent on each other, ordering transmissions based on individual node LLRs no longer works. Thus, even for conventional WSNs, ordering the transmissions becomes a challenge. We present a novel correlation-aware ordered transmissions scheme (CA-OTS) for the binary hypothesis testing problem with Gaussian statistics. CA-OTS applies to the general case in which the hypotheses differ in the mean vector and covariance matrix, and markedly reduces the number of transmissions as compared to UTS. When the mean vector or covariance matrix is the same for the two hypotheses, we propose novel refinements that require even fewer transmissions. We also derive insightful upper bounds for them that apply to a general product-correlation model
Universal Statistical Properties of Inertial-particle Trajectories in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence
No full textWe obtain new universal statistical properties of heavy-particle trajectories in three-dimensional, statistically steady, homogeneous, and isotropic turbulent flows by direct numerical simulations. We show that the probability distribution functions (PDFs) P(Φ), of the angle Φ between the Eulerian velocity u and the particle velocity v, at a point and time, scales as P(Φ) ∼Φ−, with a new universal exponent ≃ 4
Mutual-Friction Coefficients in Two-Dimensional Superfluids: From the Gross-Pitaevskii equation to the Hall-Vinen-Bekharevich-Khalatnikov Two-fluid Model
No full textWe start from the two-dimensional Gross-Pitaevskii equation (GPE) and develop algorithms for the ab-initio determination of the temperature (T) dependence of the mutual-friction coefficients, α and α, and the normal-fluid density Pn, which appear as parameters in the Hall-Vinen-Bekharevich-Khalatnikov (HVBK) two-fluid model for a superfluid. In the second part of our study, we elucidate the statistical properties of two-dimensional, homogeneous, isotropic superfluid turbulence in the simplified HVBK model, with values for the mutual-friction coefficients that are comparable to those we obtain from the first part of our study
Selfcoelum mertensis Gupta 1970, n. comb.
No full textS. mertensis (Gupta, 1970) n. comb. Type host. Common sandpiper, Actitis hypoleucos (Linnaeus) (Charadriiformes: Scolopacidae). Type locality. Merta, Nagaur District, Rajasthan, India. Remarks. This species was originally described as Ophthalmophagus mertensis Gupta, 1970. On the one hand, the position of the posttesticular ovary may have been confused with the “receptaculum seminis uterinum”, as shown in Fig. 3 of the original description and may be more posteriorly situated nearer to the posterior arch of the cyclocoel, which is more typically the case in members of this genus. On the other hand, the “receptaculum seminis uterinum” may be the posterior testis and the anterior testis which is shown as being situated near the midbody may be part of the uterus. If the second situation is true, then this species would have an intertesticular ovary froming a triangle with the diagonal testes and would be assigned to Cyclocoelinae. However, the species was described from a single damaged specimen and it appears that the anterior end is rotated somewhat to the left causing the cirrus sac to be shifted more laterally than normal. We assume that the author is correct and that the ovary is situated off the midline of the body some distance posterior to the anterior testis as is shown in Fig. 3 of the original description (apparently a dorsal view). It should be noted that although both the diameters of the oral sucker (200, but about 690 calculated using the scale provided) and the pharynx (200, but about 350 calculated using the scale provided) are given as being the same, the oral sucker is shown in Fig. 3 as being much wider than the pharynx (about twice as wide). The length of the intertesticular and posttesticular spaces could not be calculated from the original figures because of the lack of verifiable reference measurements and the scale provided. As originally described, the ovary is posttesticular forming an elongate triangle with the testes (Szidatitreminae), the genital pore is postpharyngeal and the vitelline fields are not confluent posteriorly, placing this species in Szidatitrema. Rudimentary oral sucker present—Gupta (1970).Published as part of Dronen, Norman O. & Blend, Charles K., 2015, Updated keys to the genera in the subfamilies of Cyclocoelidae Stossich, 1902, including a reconsideration of species assignments, species keys and the proposal of a new genus in Szidatitreminae Dronen, 2007, pp. 1-100 in Zootaxa 4053 (1) on page 87, DOI: 10.11646/zootaxa.4053.1.1, http://zenodo.org/record/23711
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