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  • 1988  (94)
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  • 1988  (94)
  • 1
    Language: English
    In: Inorg. Chem.; (United States), 20 April 1988, Vol.27:8
    Description: The electronic structures of copper oxide clusters representing the new superconducting materials YBa/sub 2/Cu/sub 3/O/sub 7-x/ and La/sub 2-x/M/sub x/CuO/sub 4/ (M = Ba, Sr) have been calculated by semiempirical molecular orbital methods. For YBa/sub 2/cu/sub 3/O/sub 7-x/ the orbital energies indicate that the Cu's located in the CuO/sub 3/ chains are primarily trivalent, while the Cu's in the CuO/sub 2/ dimpled planes are primarily divalent. The effects of the oxygen breathing mode on the charge distributions and orbital energies are investigated for different electronic configurations. The results indicate that the oxygen breathing modes can cause significant charge fluctuations on the Cu's in the clusters. For certain electron configurations, a double-well type potential may exist for oxygen movement between Cu's in the chains. This may cause an instability at oxygen stoichiometries near 6.75 and result in a phase separation. A phase diagram is proposed for YBa/sub 2/Cu/sub 3/O/sub 7-x/, which suggests that the 94 K high-temperature superconducting phase is characterized by an oxygen stoichiometry near 7.0. The phase diagram predicts that a plateau should exist for T/sub c/ in the region x = 0.0-0.25 and that in this region two phases are present which are characterized by compositions having oxygen stoichiometries either in the range 6.5-6.75 or close to 7.0. 24 refs., 5 figs., 4 tabs.
    Keywords: Materials Science ; Barium Compounds ; Electronic Structure ; Superconductivity ; Copper Compounds ; Lanthanum Compounds ; Oxygen Compounds ; Strontium Compounds ; Yttrium Compounds ; Experimental Data ; Alkaline Earth Metal Compounds ; Data ; Electric Conductivity ; Electrical Properties ; Information ; Numerical Data ; Physical Properties ; Rare Earth Compounds ; Transition Element Compounds ; 360204 - Ceramics, Cermets, & Refractories- Physical Properties
    ISSN: 00201669
    E-ISSN: 1520510X
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  • 2
    Language: English
    In: The British journal of psychiatry : the journal of mental science, April 1988, Vol.152, pp.460-5
    Description: The association between the familial risk for schizophrenia and season of birth was studied in 88 schizophrenic patients. An increased risk for schizophrenia and 'spectrum' disorders was demonstrated among the first-degree relatives of winter and spring-born schizophrenic patients. However, patients with a family history of schizophrenia and 'spectrum' disorders did not differ from patients with no family history with respect to season of birth. Season of birth was unrelated to the sex of the patient, birth order, age at onset, or clinical subtypes (paranoid vs non-paranoid, as defined by the RDC, and 'narrow' vs 'broad', as defined by Taylor & Abrams' 1975 criteria). The morbid-risk data support a 'stress-diathesis' hypothesis whereby environmental factors (in this case a seasonally varying viral insult may be implicated) interact with genetic vulnerability to increase the risk for schizophrenia.
    Keywords: Seasons ; Schizophrenia -- Etiology
    ISSN: 0007-1250
    Source: MEDLINE/PubMed (U.S. National Library of Medicine)
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  • 3
    Language: English
    In: British Journal of Psychiatry, 04/1988, Vol.152(4), pp.460-465
    Description: The association between the familial risk for schizophrenia and season of birth was studied in 88 schizophrenic patients. An increased risk for schizophrenia and 'spectrum' disorders was demonstrated among the first-degree relatives of winter and spring-born schizophrenic patients. However, patients with a family history of schizophrenia and 'spectrum' disorders did not differ from patients with no family history with respect to season of birth. Season of birth was unrelated to the sex of the patient, birth order, age at onset, or clinical subtypes (paranoid vs non-paranoid, as defined by the RDC, and 'narrow' vs 'broad', as defined by Taylor & Abrams' 1975 criteria). The morbid-risk data support a 'stress-diathesis' hypothesis whereby environmental factors (in this case a seasonally varying viral insult may be implicated) interact with genetic vulnerability to increase the risk for schizophrenia.
    Keywords: Medicine;
    ISSN: 0007-1250
    E-ISSN: 1472-1465
    Source: CrossRef
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  • 4
    In: Journal of Personality, December 1988, Vol.56(4), pp.743-762
    Description: In this study we introduce the concept of centrality in an attempt to assess individual differences in the meaning underlying daily hassles Central hassles are defined as those which reflect important ongoing themes or problems in the person's life The characteristics of central hassles, and their role in psychological and somatic health, were assessed in a sample of 150 community‐residing men and women The results indicate that central hassles vary in content from person to person and touch more on problems with personal needs and deficits in coping skills compared to noncentral hassles The dimension of centrality was found to play a significant role in the prediction of psychological symptoms Although the empirical case for the importance of centrality in the stress‐illness relationship is inconclusive due to problems of confounding and a cross‐sectional rather than longitudinal design, the ideas presented appear promising and provide a basis for further research on psychological vulnerability to stress
    Keywords: Disease -- Etiology ; Stress, Psychological -- Complications;
    ISSN: 0022-3506
    E-ISSN: 1467-6494
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  • 5
    Language: English
    In: Political Communication, 01 January 1988, Vol.5(3), pp.211-215
    Description: The July 1, 1987 NBC News documentary on Israel's occupation of the West Bank neglected the context of the occupation, failing to give any historical perspective on the Israeli-Palestinian dispute. The nature of the Palestinian opposition- characterized by intransigence and violence-was virtually ignored by NBC. The unbalanced coverage of the conflict served only to confuse the viewer and distort the salient issues involved.
    Keywords: Government ; Political Science
    ISSN: 1058-4609
    E-ISSN: 1091-7675
    Source: Taylor & Francis (Taylor & Francis Group)
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  • 6
    Language: English
    In: Annals of the New York Academy of Sciences, 1988, Vol.522, pp.420-32
    Keywords: Arteries -- Drug Effects ; Calcium Channel Blockers -- Pharmacology
    ISSN: 0077-8923
    Source: MEDLINE/PubMed (U.S. National Library of Medicine)
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  • 7
    In: Annals of the New York Academy of Sciences, March 1988, Vol.522(1), pp.420-432
    ISSN: 0077-8923
    E-ISSN: 1749-6632
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  • 8
    Language: English
    In: Phys. Rev. B: Condens. Matter; (United States), 15 October 1988, Vol.38:12
    Description: We report the first experimental observation of negative H/sup -/ ions photodesorbed from a cesiated W(100) surface. The kinetic energy of H/sup -/ ions is centered at 1 eV. The relatively flat spectral response of the H/sup -/ yield in the 30--100-eV photon energy range suggests that the electronic excitations responsible for H/sup -/ desorption involve bonding-to-antibonding level transitions and resonant tunneling within the adsorbate-substrate complex. Cesiation of the W(100) surface was found to be essential for H/sup -/ desorption.
    Keywords: Condensed Matter Physics, Superconductivity And Superfluidity ; Hydrogen Ions 1 Minus ; Desorption ; Tungsten ; Cesium Additions ; Sorptive Properties ; Catalysis ; Crystal FACES ; Photon Collisions ; Work Functions ; Alloys ; Anions ; Cesium Alloys ; Charged Particles ; Collisions ; Elements ; Functions ; Hydrogen Ions ; Ions ; Metals ; Surface Properties ; Transition Elements ; 656003 - Condensed Matter Physics- Interactions Between Beams & Condensed Matter- (1987-)
    ISSN: 01631829
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  • 9
    Language: English
    In: Langmuir, 01/1988, Vol.4(1), pp.121-127
    ISSN: 0743-7463
    E-ISSN: 1520-5827
    Source: American Chemical Society (via CrossRef)
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  • 10
    Language: English
    In: Terrorism, 01/1988, Vol.11(3), pp.235-239
    Description: The basic intent of Congress in enacting the Anti‐Terrorism Act of 1987 was not to deprive supporters of the Palestinian Liberation Organization of expressing their opinions but to induce the PLO to renounce the use of terrorism. By reaffirming United States abhorrence of terrorism, the supporters of this legislation also hope to encourage the emergence of Palestinian leaders who are dedicated to a peaceful resolution of the Arab‐Israel conflict. While the United States Government and major Jewish organizations have supported the closing of the PLO's Washington‐based Palestine Information Office, there has been considerable questioning in these same circles of the wisdom of the Congressional action to close the PLO's Observer Mission to the United Nations. This action was challenged by the United Nations, and the International Court of Justice asked the United States to resolve this matter through arbitration. The Reagan Administration finally accepted a Federal court ruling that the law did not require closing the U.N. Mission.
    ISSN: 0149-0389
    Source: Informa - Taylor & Francis (via CrossRef)
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