Try a new search

Format these results:

Searched for:

person:kramem01

in-biosketch:yes

Total Results:

8


Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole

Psaltis, Dimitrios; Medeiros, Lia; Christian, Pierre; Özel, Feryal; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Ball, David; Baloković, Mislav; Barrett, John; Bintley, Dan; Blackburn, Lindy; Boland, Wilfred; Bower, Geoffrey C; Bremer, Michael; Brinkerink, Christiaan D; Brissenden, Roger; Britzen, Silke; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E; Chael, Andrew; Chan, Chi-Kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Cho, Ilje; Conway, John E; Cordes, James M; Crew, Geoffrey B; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Eatough, Ralph P; Falcke, Heino; Fish, Vincent L; Fomalont, Ed; Fraga-Encinas, Raquel; Friberg, Per; Fromm, Christian M; Gammie, Charles F; García, Roberto; Gentaz, Olivier; Goddi, Ciriaco; Gómez, José L; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Hesper, Ronald; Ho, Luis C; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L; Huang, Lei; Hughes, David H; Inoue, Makoto; Issaoun, Sara; James, David J; Jannuzi, Buell T; Janssen, Michael; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D; Jorstad, Svetlana; Jung, Taehyun; Karami, Mansour; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K; Kettenis, Mark; Kim, Jae-Young; Kim, Junhan; Kim, Jongsoo; Kino, Motoki; Koay, Jun Yi; Koch, Patrick M; Koyama, Shoko; Kramer, Michael; Kramer, Carsten; Krichbaum, Thomas P; Kuo, Cheng-Yu; Lauer, Tod R; Lee, Sang-Sung; Li, Yan-Rong; Li, Zhiyuan; Lindqvist, Michael; Lico, Rocco; Liu, Jun; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P; Lonsdale, Colin; Lu, Ru-Sen; Mao, Jirong; Markoff, Sera; Marrone, Daniel P; Marscher, Alan P; Martí-Vidal, Iván; Matsushita, Satoki; Mizuno, Yosuke; Mizuno, Izumi; Moran, James M; Moriyama, Kotaro; Moscibrodzka, Monika; Müller, Cornelia; Musoke, Gibwa; Mus Mejías, Alejandro; Nagai, Hiroshi; Nagar, Neil M; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Neri, Roberto; Noutsos, Aristeidis; Okino, Hiroki; Olivares, Héctor; Oyama, Tomoaki; Palumbo, Daniel C M; Park, Jongho; Patel, Nimesh; Pen, Ue-Li; Piétu, Vincent; Plambeck, Richard; PopStefanija, Aleksandar; Prather, Ben; Preciado-López, Jorge A; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G; Raymond, Alexander W; Ripperda, Bart; Roelofs, Freek; Rogers, Alan; Ros, Eduardo; Rose, Mel; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L; Ruszczyk, Chet; Ryan, Benjamin R; Rygl, Kazi L J; Sánchez, Salvador; Sánchez-Arguelles, David; Sasada, Mahito; Savolainen, Tuomas; Schloerb, F Peter; Schuster, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Tazaki, Fumie; Tilanus, Remo P J; Titus, Michael; Torne, Pablo; Trent, Tyler; Traianou, Efthalia; Trippe, Sascha; van Bemmel, Ilse; van Langevelde, Huib Jan; van Rossum, Daniel R; Wagner, Jan; Wardle, John; Ward-Thompson, Derek; Weintroub, Jonathan; Wex, Norbert; Wharton, Robert; Wielgus, Maciek; Wong, George N; Wu, Qingwen; Yoon, Doosoo; Young, André; Young, Ken; Younsi, Ziri; Yuan, Feng; Yuan, Ye-Fei; Zhao, Shan-Shan
The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new and clean gravitational test of the black-hole metric in the strong-field regime. We show analytically that spacetimes that deviate from the Kerr metric but satisfy weak-field tests can lead to large deviations in the predicted black-hole shadows that are inconsistent with even the current EHT measurements. We use numerical calculations of regular, parametric, non-Kerr metrics to identify the common characteristic among these different parametrizations that control the predicted shadow size. We show that the shadow-size measurements place significant constraints on deviation parameters that control the second post-Newtonian and higher orders of each metric and are, therefore, inaccessible to weak-field tests. The new constraints are complementary to those imposed by observations of gravitational waves from stellar-mass sources.
PMID: 33064506
ISSN: 1079-7114
CID: 4660862

Forgetting trauma: Socially shared retrieval-induced forgetting and post-traumatic stress disorder

Brown, Adam D; Kramer, Michael E; Romano, Tracy A; Hirst, William
Memory for related but unpracticed aspects of an event can be impaired by selectively retrieving parts of the same event. This occurs when selective retrieval [within-individual retrieval-induced forgetting (WI-RIF)] is undertaken by individuals and has been extended to social contexts--RIF can be produced in listeners [socially shared retrieval-induced forgetting (SS-RIF)] by a speaker's selective recounting. The effects of post-traumatic stress disorder (PTSD) on WI-RIF and SS-RIF were examined by two experiments. In Experiment 1, combat veterans (with or without PTSD) and non-veteran dyads participated in a RIF paired-associates paradigm adapted for combat-related stimuli. WI-RIF and SS-RIF occurred for combat-related and neutral pairs regardless of group. However, greater WI-RIF and SS-RIF for combat-related words were shown by individuals with PTSD. These findings were replicated by Experiment 2, in which either a combat-related or neutral story was learned by participants, and selective retrieval was embedded in a conversation. That the selective retrieval of trauma-related stimuli leads to enhancement of induced forgetting for individuals with PTSD under certain conditions is suggested by these data.
PSYCH:2012-02108-002
ISSN: 1099-0720
CID: 160559

Trauma centrality and PTSD in veterans returning from Iraq and Afghanistan

Brown, Adam D; Antonius, Daniel; Kramer, Michael; Root, James C; Hirst, William
Research has demonstrated that the extent to which an individual integrates a traumatic event into their identity ('trauma centrality') positively correlates with posttraumatic stress disorder (PTSD) symptom severity. No research to date has examined trauma centrality in individuals exposed to combat stress. This study investigated trauma centrality using the abridged Centrality of Event Scale (Berntsen & Rubin, 2006) among Operation Enduring Freedom/Operation Iraqi Freedom combat veterans (n = 46). Multiple regression analyses demonstrated that trauma centrality predicted PTSD symptoms. Trauma centrality and PTSD symptoms remained significantly correlated when controlling for depression in subgroups of veterans with or without probable PTSD. This study replicates and extends findings that placing trauma at the center of one's identity is associated with PTSD symptomatology
PMID: 20690194
ISSN: 1573-6598
CID: 127258

Impact of treatment for depression on desire for hastened death in patients with advanced AIDS

Breitbart, William; Rosenfeld, Barry; Gibson, Christopher; Kramer, Michael; Li, Yuelin; Tomarken, Alexis; Nelson, Christian; Pessin, Hayley; Esch, Julie; Galietta, Michele; Garcia, Nerina; Brechtl, John; Schuster, Michael
BACKGROUND: Despite the development of multi-drug regimens for HIV, palliative care and quality-of-life issues in patients with advanced AIDS remain important areas of clinical investigation. OBJECTIVE: Authors assessed the impact of treatment for depression on desire for hastened death in patients with advanced AIDS. METHOD: Patients with advanced AIDS (N=372) were interviewed shortly after admission to a palliative-care facility, and were reinterviewed monthly for the next 2 months. Patients diagnosed with a major depressive syndrome were provided with antidepressant treatment and reinterviewed weekly. Desire for hastened death was assessed with two questionnaire measures. RESULTS: Desire for death was highly associated with depression, and it decreased dramatically in patients who responded to antidepressant treatment. Little change in desire for hastened death was observed in patients whose depression did not improve. Although improved depression was not significantly associated with the use of antidepressant medication, those individuals prescribed antidepressant medication showed the largest decreases in desire for hastened death. DISCUSSION: Successful treatment for depression appears to substantially decrease desire for hastened death in patients with advanced AIDS. The authors discuss implications of these findings for palliative-care treatment and the physician-assisted suicide debate.
PMCID:3640865
PMID: 20332284
ISSN: 1545-7206
CID: 2108442

Systemic and ocular manifestations of catastrophic antiphospholipid syndrome: a case report

Bahar, Irit; Hershcovici, Tiberiu; Axer-Siegel, Ruth; Molad, Yair; Weinberger, Dov; Kramer, Michal
PMID: 25390222
ISSN: 1935-1089
CID: 1458322

Desire for hastened death among patients with advanced AIDS

Rosenfeld, Barry; Breitbart, William; Gibson, Christopher; Kramer, Michael; Tomarken, Alexis; Nelson, Christian; Pessin, Hayley; Esch, Julie; Galietta, Michele; Garcia, Nerina; Brechtl, John; Schuster, Michael
The recent debate over legalization of physician-assisted suicide has fueled interest in understanding factors that lead medically ill patients to seek a hastened death. The authors investigated the prevalence and predictors of desire for hastened death in 372 patients with advanced AIDS who were newly admitted to a palliative-care facility. Clinician-rated and self-report measures of desire for hastened death, depression, hopelessness, spiritual well-being, social support, pain, and physical symptom burden were administered to assess the factors that correspond to a high desire for death. The prevalence ranged from 4.6% to 8.3%, significantly lower than in previous studies of patients with advanced or terminal cancer. Multivariate models revealed significant and unique effects for both hopelessness and depression, with these variables accounting for a large proportion of the variance in each model. Authors discuss the implications of these findings for palliative care practice and the assisted-suicide debate.
PMID: 17116952
ISSN: 0033-3182
CID: 2108342

Differences in job placements between men and women with mental retardation

Levy, J M; Botuck, S; Levy, P H; Kramer, M E; Murphy, B S; Rimmerman, A
Thirty-three men and women with mental retardation living in the New York metropolitan area (USA), who entered a supported employment programme were followed during their first 9 months in competitive employment. Differences in placement outcomes were consistently associated with gender differences. The implications of these findings are discussed in terms of providing employment services to men and women with mental retardation and developmental disabilities.
PMID: 8043884
ISSN: 0963-8288
CID: 1635642

A one year follow-up of urban young adults with mental retardation in supported employment

Botuck, S; Levy, J M; Kramer, M E; Levy, P H; Rimmerman, A
There is little information available about the provision of supported employment services for individuals from diverse cultural, ethnic and economic backgrounds. To fill this gap, in relation to the specific experiences of urban youth with mental retardation, we initiated an agency based longitudinal study of our employment training programmes. Data from the first year follow up of 45 young adults with mental retardation is presented. Information regarding all phases of the job training and job placement process was examined. The major findings are that 71% of the trainees were employed during the first nine months post-training, with approximately 30% of the trainees working for six months or more. Overall, 75% of the trainees' placements were in service industries and the amount of direct support the trainees required decreased over time. Additional findings and their implications for programme development are discussed in relation to the unique needs of urban young adults with developmental disabilities.
PMID: 1526699
ISSN: 0342-5282
CID: 1635652