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  • 2015-2019  (63)
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  • Articles  (73)
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  • 1
    Electronic Resource
    Electronic Resource
    I see that I see: a hero's impact on a family therapist (2005)
    Bingley : Emerald
    Kybernetes 34 (2005), S. 343-352 
    Details
    ISSN: 0368-492X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Purpose - The purpose of this paper is to highlight the influence of the late Heinz von Foerster in the life of an admirer and friend who remains a leader in the field of family therapy. Design/methodology/approach - The approach is autobiographical. The method is (loosely) process recall and personal theoretical reflection. Objectives are achieved by organizing major tenets of von Foerster's constructivism into personal categories of meaning. Findings - Findings included a deep philosophical influence on the author's professional life; an abiding impact on his personal life; and a durability of von Foerster's ideas across disciplines, time, and the ever-changing theories and politics of the mental health profession. Originality/value - This paper adds value to the social sciences in general, and to the field of family therapy in particular, because it highlights the interconnectedness of person and profession and the confluence of the messenger/message. Some might say this is cybernetics in vivo. There may be little that is "new" in this paper in terms of theoretical constructs, but the autobiographical nature of the reflections may be its most valuable contribution to others struggling with such concepts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03684920510581512
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  • 2
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    Observational constraints on glyoxal production from isoprene oxidation and its contribution to organic aerosol over the Southeast United States (2016)
    Wiley
    Details
    Publication Date: 2016-08-02
    Description: We use a 0-D photochemical box model and a 3-D global chemistry-climate model, combined with observations from the NOAA Southeast Nexus (SENEX) aircraft campaign, to understand the sources and sinks of glyoxal over the Southeast United States. Box model simulations suggest a large difference in glyoxal production among three isoprene oxidation mechanisms (AM3ST, AM3B, and MCM v3.3.1). These mechanisms are then implemented into a 3-D global chemistry-climate model. Comparison with field observations shows that the average vertical profile of glyoxal is best reproduced by AM3ST with an effective reactive uptake coefficient γ glyx of 2 × 10 -3 , and AM3B without heterogeneous loss of glyoxal. The two mechanisms lead to 0-0.8 µg m -3 secondary organic aerosol (SOA) from glyoxal in the boundary layer of the Southeast U.S. in summer. We consider this to be the lower limit for the contribution of glyoxal to SOA, as other sources of glyoxal other than isoprene are not included in our model. In addition, we find that AM3B shows better agreement on both formaldehyde and the correlation between glyoxal and formaldehyde ( R GF  = [GLYX]/[HCHO]), resulting from the suppression of δ-isoprene peroxy radicals (δ-ISOPO 2 ). We also find that MCM v3.3.1 may underestimate glyoxal production from isoprene oxidation, in part due to an underestimated yield from the reaction of IEPOX peroxy radicals (IEPOXOO) with HO 2 . Our work highlights that the gas-phase production of glyoxal represents a large uncertainty in quantifying its contribution to SOA.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Agmantinite, Ag2MnSnS4, a new mineral with a wurtzite derivative structure from the Uchucchacua polymetallic deposit, Lima Department, Peru (2018)
    Mineralogical Society of Great Britain and Ireland
    Details
    Publication Date: 2018
    Description: 〈div data-abstract-type="normal"〉 〈p〉Agmantinite, ideally Ag〈span〉2〈/span〉MnSnS〈span〉4〈/span〉, is a new mineral from the Uchucchacua polymetallic deposit, Oyon district, Catajambo, Lima Department, Peru. It occurs as orange–red crystals up to 100 μm across. Agmantinite is translucent with adamantine lustre and possesses a red streak. It is brittle. Neither fracture nor cleavage were observed. Based on the empirical formula the calculated density is 4.574 g/cm〈span〉3〈/span〉. On the basis of chemically similar compounds the Mohs hardness is estimated at between 2 to 2½. In plane-polarised light agmantinite is white with red internal reflections. It is weakly bireflectant with no observable pleochroism with red internal reflections. Between crossed polars, agmantinite is weakly anisotropic with reddish brown to greenish grey rotation tints. The reflectances (〈span〉R〈/span〉〈span〉min〈/span〉 and 〈span〉R〈/span〉〈span〉max〈/span〉) for the four standard wavelengths are: 19.7 and 22.0 (470 nm); 20.5 and 23.2 (546 nm); 21.7 and 2.49 (589 nm); and 20.6 and 23.6 (650 nm), respectively.〈/p〉 〈p〉Agmantinite is orthorhombic, space group 〈span〉P〈/span〉2〈span〉1〈/span〉〈span〉nm〈/span〉, with unit-cell parameters: 〈span〉a〈/span〉 = 6.632(2), 〈span〉b〈/span〉 = 6.922(2), 〈span〉c〈/span〉 = 8.156(2) Å, 〈span〉V〈/span〉 = 374.41(17) Å〈span〉3〈/span〉, 〈span〉a〈/span〉:〈span〉b〈/span〉:〈span〉c〈/span〉 0.958:1:1.178 and 〈span〉Z〈/span〉 = 2. The crystal structure was refined to 〈span〉R〈/span〉 = 0.0575 for 519 reflections with 〈span〉I 〉〈/span〉 2σ(〈span〉I〈/span〉). Agmantinite is the first known mineral of 〈span〉〈span〉〈img data-mimesubtype="gif" data-type="simple" src="http://static.cambridge.org/resource/id/urn:cambridge.org:id:binary:20190522072108342-0385:S0026461X18001391:S0026461X18001391_inline1.gif"〉 〈span data-mathjax-type="texmath"〉 〈/span〉 〈/span〉〈/span〉〈span〉M〈/span〉〈span〉II〈/span〉〈span〉M〈/span〉〈span〉IV〈/span〉S〈span〉4〈/span〉 type that is derived from wurtzite rather than sphalerite by ordered substitution of Zn, analogous to the substitution pattern for deriving stannite from sphalerite. The six strongest X-ray powder-diffraction lines derived from single-crystal X-ray diffraction data [〈span〉d〈/span〉 in Å (intensity)] are: 3.51 (s), 3.32 (w), 3.11 (vs), 2.42 (w), 2.04 (m) and 1.88 (m). The empirical formula (based on 8 apfu) is (Ag〈span〉1.94〈/span〉Cu〈span〉0.03〈/span〉)〈span〉Σ1.97〈/span〉(Mn〈span〉0.98〈/span〉Zn〈span〉0.05〈/span〉)〈span〉Σ1.03〈/span〉Sn〈span〉0.97〈/span〉S〈span〉4.03〈/span〉.The crystal structure-derived formula is Ag〈span〉2〈/span〉(Mn〈span〉0.69〈/span〉Zn〈span〉0.31〈/span〉)〈span〉Σ1.00〈/span〉SnS〈span〉4〈/span〉 and the simplified formula is Ag〈span〉2〈/span〉MnSnS〈span〉4〈/span〉.〈/p〉 〈p〉The name is for the composition and the new mineral and mineral name have been approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification (IMA2014-083).〈/p〉 〈/div〉
    Print ISSN: 0026-461X
    Electronic ISSN: 1471-8022
    Topics: Geosciences
    Published by Mineralogical Society of Great Britain and Ireland
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  • 4
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    Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA. (2018)
    Mineralogical Society of Great Britain and Ireland
    Details
    Publication Date: 2018
    Description: 〈div data-abstract-type="normal"〉〈p〉Structural data for weishanite, an alloy of Au, Ag and Hg, were collected for the first time from a crystal from the Keystone Mine, Colorado, USA. The structure was solved in the space group 〈span〉P〈/span〉6〈span〉3〈/span〉/〈span〉mmc〈/span〉 with the unit cell 〈span〉a〈/span〉 = 2.9348(8) and 〈span〉c〈/span〉 = 4.8215(18) Å] and refined to 〈span〉R〈/span〉 = 0.0299 for 40 observed reflections [4σ(〈span〉F〈/span〉) level] and four parameters and to 〈span〉R〈/span〉 = 0.0356 for all 47 independent reflections. The weishanite structure can be considered a derivative of the zinc structure, with Au, Ag and Hg disordered in the same structural position. On this basis, we suggest that the formula is normalized to 1 atom with 〈span〉Z〈/span〉 = 2, leading, for the sample investigated, to Au〈span〉0.41〈/span〉Ag〈span〉0.31〈/span〉Hg〈span〉0.28〈/span〉 (electron microprobe data). Accordingly, weishanite can be considered the Au-rich isotype of schachnerite. A comparison with other Au/Ag-Hg alloys is presented together with a critical discussion about the nomenclature rules to be applied to alloys and simple metals.〈/p〉〈/div〉
    Print ISSN: 0026-461X
    Electronic ISSN: 1471-8022
    Topics: Geosciences
    Published by Mineralogical Society of Great Britain and Ireland
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  • 5
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    A geodetic matched-filter search for slow slip with application to the Mexico subduction zone (2017)
    Wiley
    Details
    Publication Date: 2017-08-24
    Description: Since the discovery of slow slip events, many methods have been successfully applied to model obvious transient events in geodetic time series, such as the widely used network strain filter. Independent seismological observations of tremors or low frequency earthquakes and repeating earthquakes provide evidence of low amplitude slow deformation but do not always coincide with clear occurrences of transient signals in geodetic time series. Here, we aim to extract the signal corresponding to slow slips hidden in the noise of GPS time series, without using information from independent datasets. We first build a library of synthetic slow slip event templates by assembling a source function with Green's functions for a discretized fault. We then correlate the templates with post-processed GPS time series. Once the events have been detected in time, we estimate their duration T and magnitude M w by modelling a weighted stack of GPS time series. An analysis of synthetic time series shows that this method is able to resolve the correct timing, location, T and M w of events larger than M w 6 in the context of the Mexico subduction zone. Applied on a real data set of 29 GPS time series in the Guerrero area from 2005 to 2014, this technique allows us to detect 28 transient events from M w 6.3 to 7.2 with durations that range from 3 to 39 days. These events have a dominant recurrence time of 40 days and are mainly located at the down dip edges of the M w 〉 7.5 SSEs.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    Developmental and oncogenic programs in H3K27M gliomas dissected by single-cell RNA-seq (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-04-20
    Description: Gliomas with histone H3 lysine27-to-methionine mutations (H3K27M-glioma) arise primarily in the midline of the central nervous system of young children, suggesting a cooperation between genetics and cellular context in tumorigenesis. Although the genetics of H3K27M-glioma are well characterized, their cellular architecture remains uncharted. We performed single-cell RNA sequencing in 3321 cells from six primary H3K27M-glioma and matched models. We found that H3K27M-glioma primarily contain cells that resemble oligodendrocyte precursor cells (OPC-like), whereas more differentiated malignant cells are a minority. OPC-like cells exhibit greater proliferation and tumor-propagating potential than their more differentiated counterparts and are at least in part sustained by PDGFRA signaling. Our study characterizes oncogenic and developmental programs in H3K27M-glioma at single-cell resolution and across genetic subclones, suggesting potential therapeutic targets in this disease.
    Keywords: Genetics, Medicine, Diseases
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Minerals, Vol. 8, Pages 192: Oyonite, Ag3Mn2Pb4Sb7As4S24, a New Member of the Lillianite Homologous Series from the Uchucchacua Base-Metal Deposit, Oyon District, Peru (2018)
    MDPI Publishing
    In: Minerals
    Details
    Publication Date: 2018-05-03
    Description: Minerals, Vol. 8, Pages 192: Oyonite, Ag3Mn2Pb4Sb7As4S24, a New Member of the Lillianite Homologous Series from the Uchucchacua Base-Metal Deposit, Oyon District, Peru Minerals doi: 10.3390/min8050192 Authors: Luca Bindi Cristian Biagioni Frank N. Keutsch The new mineral species oyonite, ideally Ag3Mn2Pb4Sb7As4S24, has been discovered in the Uchucchacua base-metal deposit, Oyon district, Catajambo, Lima Department, Peru, as very rare black metallic subhedral to anhedral crystals, up to 100 μm in length, associated with orpiment, tennantite/tetrahedrite, menchettiite, and other unnamed minerals of the system Pb-Ag-Sb-Mn-As-S, in calcite matrix. Its Vickers hardness (VHN100) is 137 kg/mm2 (range 132–147). In reflected light, oyonite is weakly to moderately bireflectant and weakly pleochroic from dark grey to a dark green. Internal reflections are absent. Reflectance values for the four COM wavelengths [Rmin, Rmax (%) (λ in nm)] are: 33.9, 40.2 (471.1); 32.5, 38.9 (548.3), 31.6, 38.0 (586.6); and 29.8, 36.5 (652.3). Electron microprobe analysis gave (in wt %, average of 5 spot analyses): Cu 0.76 (2), Ag 8.39 (10), Mn 3.02 (7), Pb 24.70 (25), As 9.54 (12), Sb 28.87 (21), S 24.30 (18), total 99.58 (23). Based on 20 cations per formula unit, the chemical formula of oyonite is Cu0.38Ag2.48Mn1.75Pb3.79Sb7.55As4.05S24.12. The main diffraction lines are (d in Å, hkl and relative intensity): 3.34 (−312; 40), 3.29 (−520; 100), 2.920 (−132; 40), 2.821 (−232; 70), 2.045 (004; 50). The crystal structure study revealed oyonite to be monoclinic, space group P21/n, with unit-cell parameters a = 19.1806 (18), b = 12.7755 (14), c = 8.1789 (10) Å, β = 90.471 (11)°, V = 2004.1 (4) Å3, Z = 2. The crystal structure was refined to a final R1 = 0.032 for 6272 independent reflections. Oyonite belongs to the Sb-rich members of the andorite homeotypic sub-series within the lillianite homologous series. The name oyonite is after the Oyon district, Lima Department, Peru, the district where the type locality (Uchucchacua mine) is located.
    Electronic ISSN: 2075-163X
    Topics: Geosciences
    Published by MDPI Publishing
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  • 8
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    Isoprene Suppression of New Particle Formation: Potential Mechanism and Implications (2016)
    Wiley
    Details
    Publication Date: 2016-12-10
    Description: Secondary aerosols formed from anthropogenic pollutants and natural emissions have substantial impacts on human health, air quality and the Earth's climate. New particle formation (NPF) contributes up to 70% of the global production of cloud condensation nuclei, but the effects of biogenic volatile organic compounds (BVOCs) and their oxidation products on NPF processes in forests are poorly understood. Observations show that isoprene, the most abundant BVOC, suppresses NPF in forests. But the previously proposed chemical mechanism underlying this suppression process contradicts atmospheric observations. By reviewing observations made in other forests, it is clear that NPF rarely takes place during the summer when emissions of isoprene are high, even though there are sufficient concentrations of monoterpenes. But at present it is not clear how isoprene and its oxidation products may change the oxidation chemistry of terpenes and how NO x and other atmospheric key species affect NPF in forest environments. Future laboratory experiments with chemical speciation of gas phase nucleation precursors and clusters and chemical composition of particles smaller than 10 nm are required to understand the role of isoprene in NPF. Our results show that climate models can overpredict aerosol's first indirect effect when not considering the absence of NPF in the southeastern U.S. forests during the summer using the current nucleation algorithm that includes only sulfuric acid and total concentrations of low volatility organic compounds. This highlights the importance of understanding NPF processes as function of temperature, RH and BVOC compositions to make valid predictions of NPF and CCN at a wide range of atmospheric conditions.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Airborne measurements of organosulfates over the continental US (2015)
    Wiley
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    Publication Date: 2015-03-01
    Description: Organosulfates are important secondary organic aerosol (SOA) components and good tracers for aerosol heterogeneous reactions. However, the knowledge of their spatial distribution, formation conditions, and environmental impact is limited. In this study, we report two organosulfates, an isoprene-derived IEPOX (2,3-epoxy-2-methyl-1,4-butanediol) sulfate and a glycolic acid (GA) sulfate, measured using the NOAA Particle Analysis Laser Mass Spectrometer (PALMS) onboard the NASA DC8 aircraft over the continental US during the DC3 and SEAC4RS campaigns. During these campaigns, IEPOX sulfate was estimated to account for 1.4% of submicron aerosol mass (or 2.2% of organic aerosol mass) on average near the ground in the southeast US, with lower concentrations in the western US (0.2-0.4%) and at high altitudes (〈0.2%). Compared to IEPOX sulfate, GA sulfate was more uniformly distributed, accounting for about 0.5% aerosol mass on average, and may be more abundant globally. A number of other organosulfates were detected; none were as abundant as these two. Ambient measurements confirmed that IEPOX sulfate is formed from isoprene oxidation and is a tracer for isoprene SOA formation. The organic precursors of GA sulfate may include glycolic acid and likely have both biogenic and anthropogenic sources. Higher aerosol acidity as measured by PALMS and relative humidity tend to promote IEPOX sulfate formation, and aerosol acidity largely drives in situ GA sulfate formation at high altitudes. This study suggests the formation of aerosol organosulfates depends not only on the appropriate organic precursors but also on emissions of anthropogenic sulfur dioxide (SO 2 ), which contributes to aerosol acidity.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA. (2018)
    Mineralogical Society of Great Britain and Ireland
    Details
    Publication Date: 2018-05-29
    Print ISSN: 0026-461X
    Electronic ISSN: 1471-8022
    Topics: Geosciences
    Published by Mineralogical Society of Great Britain and Ireland
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