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  • 1
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    Ground motion attenuation model for seismically highly hazardous indian zones using gradient boosting xgboost machine learning algorithm (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-18
    Description: Our research uses a supervised machine learning algorithm (XGBoost) and strong-motion earthquake recordings from the available seismic networks in India to create a simple but powerful ground motion attenuation model for the seismically hazardous Himalayas, Indo-Gangetic plains, and Kachchh (Gujarat). Our dataset includes 564 Peak ground acceleration (PGA) and pseudo-spectral acceleration (PSA) from 145 events from 75 three-component strong-motion accelerographs in India and surrounding areas. Moment magnitudes, epicentral distances, focal depths, and Vs30 (average seismic shear-wave velocity from the surface to 30m) are our input parameters, and PGA and PSA at twenty-five periods are our output variables. Our XGBoost model predicts ground motion using the entire dataset and a 30% randomised test dataset. Our predictability on the randomised test dataset is 0.986, and the correlation coefficient of observed and predicted PGA values for the whole dataset is 0.998. Our XGBoost ground-motion attenuation model predicts PGA and PSA datasets at four Himalayan and three Kachchh (Gujarat) stations for four events of Mw7.9, Mw6.8, Mw6.2, and Mw5.6, suggesting it would work for the Himalayas, Indo-Gangetic plains, and Kachchh (Gujarat). Another GMPE model was created using the LightGBM gradient boosting algorithm on our dataset. Finally, we compared our XGBoost model predictions to the three Himalayan GMPEs and LightGBM. The XGBoost model predicted ground motion most accurately. Period-dependent log10 output variable standard deviations range from 0.459 to 0.780. Our model predictability plots show that the current ML model can accurately predict the response spectrum for seismically high-hazard zones of India.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 2
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    The Effect of Recent Venus Transit on Earth’s Atmosphere (2006)
    Details
    Publication Date: 2019-11-04
    Description: Some experiments on June 8, 2004, the day of transit of Venus across the Sun, were undertaken at Kolkata (latitude: 23034 N) to observe effect, if any, of transit of Venus on FWF, ELF and VLF amplitudes. The result shows good correlation between their temporal variations during the transit. The observation was unbelievable as the Venus subtends only 1/32th of the cone subtended by Sun on Earth. This anomaly may be explained on the assumption that the height of Venusian atmosphere with high content of CO2, and nitrogen which absorbs electromagnetic and corpuscular radiations from Sun, depleting the solar radiation reaching the Earth to a considerable extent. As a result, relevant parameters of Earth’s atmosphere are modulated and here we show how these changes are reflected in identical behaviour of fair weather field and ELF and VLF spectra.
    Description: JCR Journal
    Description: open
    Keywords: Venus transit ; effects on atmospheric electric parameters ; 01. Atmosphere::01.01. Atmosphere::01.01.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 1569280 bytes
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  • 3
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    The effect of recent Venus transit on Earth’s atmosphere (2007)
    Details
    Publication Date: 2019-11-04
    Description: Some experiments on June 8, 2004, the day of transit of Venus across the Sun, were undertaken at Kolkata (latitude: 22°34lN) to observe the effect, if any, of transit of Venus on FWF, ELF and VLF amplitudes. The result shows a good correlation between their temporal variations during the transit. The observation was unbelievable as the Venus subtends only 1/32th of the cone subtended by Sun on Earth. This anomaly may be explained on the assumption that the height of Venusian atmosphere with high content of CO2, and nitrogen which absorbs electromagnetic and corpuscular radiations from Sun, depleting the solar radiation reaching the Earth to a considerable extent. As a result, relevant parameters of Earth’s atmosphere are modulated and here we show how these changes are reflected in identical behaviour of fair weather field and ELF and VLF spectra.
    Description: JCR Journal
    Description: open
    Keywords: Venus transit ; effects on atmospheric electric parameters ; 01. Atmosphere::01.01. Atmosphere::01.01.05. Radiation
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetotransport properties of La2/3Sr1/3MnO3 thin film (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5940-5944 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the temperature and magnetic field dependence of the resistivity of La2/3Sr1/3MnO3 thin film over a wide temperature range and in high magnetic fields up to 20 T. Both above and below the ferromagnetic (FM) transition, the field dependence of the magnetoresistance (MR) can be described well using the extended Mott hopping conduction model. The large MR is proportional to the Brillouin function BJ in the FM phase and to BJ2 in the paramagnetic state which is consistent with this model. The value of spin moment J deduced from the temperature and magnetic field dependence of the MR is large (∼60) in the vicinity of the FM transition. This large value of J has been attributed to the presence of magnetic clusters due to the short-range FM ordering. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1467956
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  • 5
    Electronic Resource
    Electronic Resource
    Heat diffusivity of Nd1−xSrxMnO3−δ and La1−xCaxMnO3−δ compounds : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7148-7150 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal diffusivity of bulk and epitaxial layer samples of the giant magnetoresistance compounds Nd0.67Sr0.33MnO3−δ and La0.67Ca0.33MnO3−δ is investigated in a comparative study for temperatures between 35 and 350 K in order to detect preparational differences and to correlate the thermal transport with magnetization M and resistivity ρ. We find for Nd–Sr an anomaly of the heat diffusivity D near 145 K (80 K La–Ca) which we attribute to a temperature-induced canted metal to AFM insulator transition and a second anomaly in D(T) near 250 K (300 K) which we assign to the transition to paramagnetism. The low-temperature anomaly can be a step of up to five times in the heat conductivity, which makes these compounds potential magnetic field activated heat switches, as this transition can also be induced by a magnetic field. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367790
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic moment, thermal and electrical transport in the inverse Mott systems BaCo0.9Ni0.1S2−y and CuIr2S4 : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6977-6979 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The antiferromagnetic BaCo0.9Ni0.1S2−y and the paramagnetic CuIr2S4 Mott systems show an inverse conductivity behavior, i.e., the metallic phase occurs at low or high temperatures, respectively, which also suggests inverse behavior in other transport properties. In this contribution we present magnetization data, conductivity, thermal conductivity, and Seebeck effect in the temperature range 4.2 K〈T〈350 K and in particular through the metal-insulator transition at TMI. We recover the anomalies in χ(T),σ(T), which are discussed using Jahn-Teller and anti-Jahn-Teller models; also, we compare the anomalies in σ(T), S(T), and of the heat conductivity κ(T) at TMI. In particular, for BaCo0.9Ni0.1S1.95, we find a step in κ of almost one order of magnitude (times 6) and a large pressure shift, ≤−24 K/kbar, which makes this material a potential pressure activated heat switch, while CuIr2S4 shows a small step of κ (times 1.2) and a pressure shift of +2.8 K/kbar. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367748
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  • 7
    Electronic Resource
    Electronic Resource
    Heat diffusivity of La1−xCaxMnO3 epitaxial layers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2343-2345 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Seebeck effect and the thermal diffusivity of La0.67Ca0.33MnO3−δ were investigated in the temperature range 35〈T〈300 K and in particular in the regime of the high magnetoresistance and maximum resistivity ρmax. We find a sign change of the thermoelectric power S(T) and a step in heat conductivity near ρmax which we attribute to a temperature-induced metal–insulator transition at about 80 K, suggesting that the large giant magnetoresistance found in these substances is due to a field-induced metal–insulator transition. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115852
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  • 8
    Electronic Resource
    Electronic Resource
    The propagation of quality management concepts in the Indian manufacturing industry: some empirical observations (2000)
    Bradford : Emerald
    The @TQM magazine 12 (2000), S. 205-213 
    Details
    ISSN: 0954-478X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Presents findings from a study that investigated the propagation of quality management practices among Indian manufacturing companies over a period of 16 years from 1980 to 1996. Reports the findings of a mail questionnaire survey conducted on 500 selected companies from 14 manufacturing sectors. The extent to which quality management practices have been implemented is reported and the obstacles to adoption are identified. The spread of quality initiatives in various functional areas is analysed and discussed. The paper will be of particular interest to practicing managers as it identifies a number of policies that governments may use to stimulate the adoption of quality management concepts in developing countries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09544780010320232
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  • 9
    Electronic Resource
    Electronic Resource
    MIS-user interface design for job shop manufacturing environment (2000)
    Bingley : Emerald
    International journal of operations & production management 20 (2000), S. 468-480 
    Details
    ISSN: 0144-3577
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: This paper describes a framework in developing MIS-user interfaces to highlight how generic management information systems can be made more useful to managerial decision making. The suggested framework has been implemented in a medium-sized job shop manufacturing company. Object-oriented programming technology is used to provide flexible access to information stored by a generic MIS, namely ManuSoft. To improve the usefulness of the MIS, 20 interfacing programs relating to the information requirements at operational, planning and strategic levels have been developed and implemented. For purposes of illustration, three such programs have been described in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/01443570010314791
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  • 10
    Electronic Resource
    Electronic Resource
    The diffusion of quality in Australian manufacturing (1999)
    Bingley : Emerald
    International journal of quality & reliability management 16 (1999), S. 575-590 
    Details
    ISSN: 0265-671X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Previous surveys on quality management have shown that increasingly firms in Australia are adopting and implementing quality control tools and a total quality management philosophy. This paper attempts to determine the effectiveness of quality initiatives that have been implemented and integrated within Australian manufacturing firms. The authors used a combination of questionnaire surveys and interviews to gather information from quality professionals about the different types of quality tools being implemented by firms. The findings of this study are compared with other national and international surveys. A major finding of this study is that the trend of quality initiatives being implemented has been increasing since the early 1980s and the increase is observed in all functional areas of manufacturing. In addition, it reported that manufacturing firms are more conscious about quality and customer satisfaction than ever before. This paper attempts to establish relationships between the adoption of quality initiatives and its benefits with respect to reducing rejects and labour disputes, and increasing revenue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02656719910245887
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