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Meinrenken CJ, Rauschkolb N, Abrol S, Chakrabarty T, Decalf VC, Hidey C, McKeown K, Mehmani A, Modi V, Culligan PJ. MFRED, 10 second interval real and reactive power for groups of 390 US apartments of varying size and vintage. Sci Data 2020; 7:375. [PMID: 33168826 PMCID: PMC7652872 DOI: 10.1038/s41597-020-00721-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 10/13/2020] [Indexed: 12/02/2022] Open
Abstract
Building electricity is a major component of global energy use and its environmental impacts. Detailed data on residential electricity use have many interrelated research applications, from energy conservation to non-intrusive load monitoring, energy storage, integration of renewables, and electric vs. fossil-based heating. The dataset presented here, Multifamily Residential Electricity Dataset (MFRED), contains the electricity use of 390 apartments, ranging from studios to four-bedroom units. All apartments are located in the Northeastern United States (IECC-climate-zone 4 A), but differ in their heating/cooling system and construction year (early to late 20th century). To adhere to privacy guidelines, data were averaged across 15 apartments each, based on annual electricity use. MFRED includes real and reactive power, at 10-second resolution, for January to December 2019 (246 million data points). The annual average real power per apartment is 343 W (3.27 W/m2 of floor area), with strong variation between seasons and apartment size. Considering its large number of apartments, high time resolution, real and reactive power, and 12-month duration, MFRED is currently unique for the multifamily-sector.
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Affiliation(s)
- Christoph J Meinrenken
- Data Science Institute, Columbia University, New York, USA.
- Earth Institute, Columbia University, New York, USA.
| | - Noah Rauschkolb
- Department of Mechanical Engineering, Columbia University, New York, USA
| | - Sanjmeet Abrol
- Data Science Institute, Columbia University, New York, USA
| | | | | | | | - Kathleen McKeown
- Data Science Institute, Columbia University, New York, USA
- Department of Computer Science, Columbia University, New York, USA
| | - Ali Mehmani
- Data Science Institute, Columbia University, New York, USA
| | - Vijay Modi
- Data Science Institute, Columbia University, New York, USA
- Department of Mechanical Engineering, Columbia University, New York, USA
| | - Patricia J Culligan
- Data Science Institute, Columbia University, New York, USA
- Earth Institute, Columbia University, New York, USA
- Department of Civil Engineering and Eng. Mechanics, Columbia University, New York, USA
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Torres IJ, Qian H, Basivireddy J, Chakrabarty T, Wong H, Lam RW, Yatham LN. Three-year longitudinal cognitive functioning in patients recently diagnosed with bipolar disorder. Acta Psychiatr Scand 2020; 141:98-109. [PMID: 31840225 DOI: 10.1111/acps.13141] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/08/2019] [Indexed: 12/20/2022]
Abstract
OBJECTIVE The longitudinal course of neuropsychological functioning after the first manic episode in bipolar disorder is unknown. The present study evaluated cognitive change in bipolar disorder in the first 3 years after the initial manic episode. METHODS Ninety-one newly diagnosed patients with bipolar disorder and 61 demographically similar healthy participants received a neuropsychological evaluation assessing multiple cognitive domains at baseline, 1-year, and 3-year time points. Patients also received clinical assessments including mood ratings at all time points. RESULTS Patients showed deficits in all domains at baseline, but similar longitudinal trajectories across time relative to healthy participants in most cognitive domains. For processing speed, patients showed more gains than controls from baseline to 1 year, but these gains stabilized thereafter. Patients with alcohol/substance abuse showed an initial delay but subsequent recovery in executive functioning. Patients who discontinued antipsychotic treatment showed better cognitive outcomes in verbal memory. CONCLUSION Appropriately treated patients with bipolar disorder showed favorable cognitive outcome in the first 3 years after experiencing an initial manic episode, arguing against cognitive neuroprogression at this stage of the illness. Discontinuation of antipsychotic treatment may be associated with better cognitive outcomes, but clarification of the role of antipsychotics on cognitive functioning requires further investigation.
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Affiliation(s)
- I J Torres
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada.,British Columbia Mental Health and Substance Use Services Research Institute, Vancouver, BC, Canada
| | - H Qian
- Centre for Health Evaluation and Outcome Sciences, Vancouver, BC, Canada
| | - J Basivireddy
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
| | - T Chakrabarty
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
| | - H Wong
- Centre for Health Evaluation and Outcome Sciences, Vancouver, BC, Canada.,School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
| | - R W Lam
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
| | - L N Yatham
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
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Chakrabarty T, Paulose PL. Comparative NMR studies on Ca3LiRuO6 and Ca3NaRuO6. J Phys Condens Matter 2016; 28:236001. [PMID: 27157888 DOI: 10.1088/0953-8984/28/23/236001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report a comparative study of two ruthanate compounds, Ca3LiRuO6 and Ca3NaRuO6 by magnetic measurements, heat capacity and NMR. Ca3LiRuO6 is a weak ferromagnet with a magnetic ordering temperature of 115 K. The (7)Li NMR linewidth of Ca3LiRuO6 displays a broad shoulder above the magnetic ordering temperature. Anomalous shoulder of this type is observed in the susceptibility data also. The origin of these phenomena is not clear but could possibly be attributed to low dimensional magnetism. A contrasting magnetic behavior is seen in Ca3NaRuO6, an antiferromagnet with a transition temperature at 87 K. The NMR study shows that the Knight shift is proportional to the magnetic susceptibility. Also, in Ca3NaRuO6, the Knight shift and the linewidth of the spectra change differently compared to Ca3LiRuO6. The heat capacity of both compounds show a λ-type anomaly at respective magnetic transition temperatures. However, in both the systems the entropy change ([Formula: see text]S) is much less than that of an ordered S = 3/2 system.
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Affiliation(s)
- T Chakrabarty
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
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Abstract
We report the bulk magnetic properties of a yet unexplored vanadium-based multi-valenced spinel system, Zn3V3O8. A Curie-Weiss fit of our dc magnetic susceptibility χ(T) data in the temperature region of 140-300 K yields a Curie constant C = 0.75 cm(3)K mole(-1) V(-1), θCW = -370 K. We have observed a splitting between the zero field cooled (ZFC) and field cooled (FC) susceptibility curves below a temperature Tirr of about 6.3 K. The value of the 'frustration parameter' (|θcw|/T(N) ~ 100) suggests that the system is strongly frustrated. From the ac susceptibility measurements we find a logarithmic variation of freezing temperature (Tf) with frequency ν attesting to the formation of a spin glass below Tf. However, the value of the characteristic frequency obtained from the Vogel-Fulcher fit suggests that the ground state is closer to a cluster glass rather than a conventional spin glass. We explored further consequences of the spin glass behavior and observed aging phenomena and memory effect (both in ZFC and FC). We found that a positive temperature cycle erases the memory, as predicted by the hierarchical model. From the heat capacity CP data, a hump-like anomaly was observed in CP/T at about 3.75 K. Below this temperature the magnetic heat capacity shows a nearly linear dependence with T which is consistent with the formation of a spin glass state below Tf in Zn(3)V(3)O(8).
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Affiliation(s)
- T Chakrabarty
- Department of Physics, IIT Bombay, Powai, Mumbai 400076, India
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Chakrabarty T, Mahajan AV, Koteswararao B. Li2ZnV3O8: a vanadium-based geometrically frustrated spinel system. J Phys Condens Matter 2014; 26:265601. [PMID: 24903336 DOI: 10.1088/0953-8984/26/26/265601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report the synthesis and characterization of Li2ZnV3O8, which is a new Zn-doped LiV2O4 system containing only tetravalent vanadium. A Curie-Weiss susceptibility with a Curie-Weiss temperature of θCW ≈ -214 K suggests the presence of strong antiferromagnetic correlations in this system. We have observed a splitting between the zero-field cooled (ZFC) and field cooled (FC) susceptibility curves below 6 K. A peak is present in the ZFC curve around 3.5 K, suggestive of spin-freezing. Similarly, a broad hump is also seen in the inferred magnetic heat capacity around 9 K. The consequent entropy change is only about 8% of the value expected for an ordered S = 1/2 system. This reduction indicates the continued presence of large disorder in the system in spite of the large θCW, which might result from strong geometric frustration in the system. We did not find any temperature T dependence in our (7)Li nuclear magnetic resonance shift down to 6 K (an abrupt change in the shift does take place below 6 K), though considerable T-dependence has been found in the literature for LiV2O4--undoped or with other Zn/Ti contents. Consistent with the above observation, the (7)Li nuclear spin-lattice relaxation rate 1/T1 is relatively small and nearly T-independent, except for a small increase close to the freezing temperature which, once again, is small compared to undoped or 10% Zn or 20% Ti-doped LiV2O4.
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Affiliation(s)
- T Chakrabarty
- Department of Physics, IIT Bombay, Powai, Mumbai 400076, India
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Getz EB, Xiao M, Chakrabarty T, Cooke R, Selvin PR. A comparison between the sulfhydryl reductants tris(2-carboxyethyl)phosphine and dithiothreitol for use in protein biochemistry. Anal Biochem 1999; 273:73-80. [PMID: 10452801 DOI: 10.1006/abio.1999.4203] [Citation(s) in RCA: 333] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The newly introduced sulfhydryl reductant tris(2-carboxyethyl)phosphine (TCEP) is a potentially attractive alternative to commonly used dithiothreitol (DTT). We compare properties of DTT and TCEP important in protein biochemistry, using the motor enzyme myosin as an example protein. The reductants equally preserve myosin's enzymatic activity, which is sensitive to sulfhydryl oxidation. When labeling with extrinsic probes, DTT inhibits maleimide attachment to myosin and must be removed before labeling. In contrast, maleimide attachment to myosin was achieved in the presence of TCEP, although with less efficiency than no reductant. Surprisingly, iodoacetamide attachment to myosin was nearly unaffected by either reductant at low (0.1 mM) concentrations. In electron paramagnetic resonance (EPR) spectroscopy utilizing nitroxide spin labels, TCEP is highly advantageous: spin labels are two to four times more stable in TCEP than DTT, thereby alleviating a long-standing problem in EPR. During protein purification, Ni(2+) concentrations contaminating proteins eluted from Ni(2+) affinity columns cause rapid oxidation of DTT without affecting TCEP. For long-term storage of proteins, TCEP is significantly more stable than DTT without metal chelates such as EGTA in the buffer, whereas DTT is more stable if metal chelates are present. Thus TCEP has advantages over DTT, although the choice of reductant is application specific.
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Affiliation(s)
- E B Getz
- Cardiovascular Research Institute, University of California, San Francisco, California 94143, USA
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Neogi DK, Paul S, Bhattacharya N, Chakrabarty T, Mukherjee KK. HIV screening of foreign nationals--an important observation pertaining to unauthorised travellers. J Commun Dis 1997; 29:287-9. [PMID: 9465536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- D K Neogi
- Department of Virology, School of Tropical Medicine, Calcutta, India
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Chakravarti A, Chowdhury S, Chakrabarty S, Chakrabarty T, Mukherjee D. Liquid membrane multiple emulsion process of chromium(VI) separation from waste waters. Colloids Surf A Physicochem Eng Asp 1995. [DOI: 10.1016/0927-7757(95)03201-n] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Abstract
Golden hamster, mouse and rat hepatic cadmium metallothioneins (MT) were purified by Sephadex G-75 gel filtration, DEAE-Sephadex A-25 chromatography and activated Thiol-Sepharose 4B affinity chromatography. Metallothioneins were separated by DEAE-Sephadex A-25 chromatography into two forms: MT-1 and MT-2. In mouse and golden hamster liver, MT-1 was the major form. The purified proteins were homogeneous as judged by polyacrylamide gel electrophoresis in the presence and absence of sodium dodecyl sulfate. In non-denaturing polyacrylamide gel electrophoresis, migration of mouse, rat and golden hamster hepatic metallothioneins were found to be different. Antibodies to mouse hepatic MT-1 was raised in rabbits. The antiserum cross reacted with mouse and hamster MT-1 and MT-2 giving a single precipitin band. Mouse, rat and hamster hepatic MTs are immunologically identical but electrophoretically different. The kidney and pancreatic MTs of rat and golden hamster were purified by Sephadex G-75 gel filtration. They were immunologically distinct. Pancreas MT formed a line of partial identity with hepatic MTs. Kidney MTs form two precipitin band one identical with the pancreatic form and another of complete identity with the hepatic MTs. This indicates the presence of tissue specific MTs.
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Chakravarti A, Mukherjee S, Saha H, Chakrabarty T. Liquid-liquid extraction of zinc(II) as its ethyl xanthate. Talanta 1984; 31:215-7. [DOI: 10.1016/0039-9140(84)80055-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/1983] [Revised: 06/09/1983] [Accepted: 09/30/1983] [Indexed: 11/25/2022]
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Chakrabarty T, Silverston PL, Hudgins RR. Determining two-step control in heterogeneous catalytic reactions. CAN J CHEM ENG 1980. [DOI: 10.1002/cjce.5450580327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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