Petrography and petrology of the Hawaii Scientific Drilling Project lavas: Inferences from olivine phenocryst abundances and compositions

The Mauna Loa (ML) and Mauna Kea (MK) lavas recovered by the Hawaii Scientific Drilling Project (HSDP) include aphyric to highly olivine-phyric basalts. The average olivine phenocryst abundance in the reference suite of ML flows is 14.5 vol % (vesicle-free and weighted by the flow thickness), while the average abundances of olivine in the reference suites of the MK alkalic and tholeiitic basalts are 1.1 and 14.0 vol %, respectively. Plagioclase and augite phenocrysts are rare in the ML and MK tholeiites, but the MK alkalic basalts can have up to 4 vol % plagioclase phenocrysts. Strained olivine grains, thought to represent disaggregated dunite xenoliths from the cumulate pile within the magma chamber(s), are ubiquitous in the drill core lavas. These deformed grains can comprise up to 50 % of the modal olivine in a given rock. Olivine core compositions in the lavas span forsterite contents of 80.4–90.7 (median 88.8, ML tholeiites), 75.8–86.6 (median 85.8, MK alkalic basalts), and 76.3–90.5 (median 88.0 mol %, MK tholeiites). Olivines with core compositions in the range Fo_(89–90.5) are present in tholeiitic lavas with a wide range of whole-rock MgO contents (9–30 wt %). Strained and unstrained olivines completely overlap in composition as do the compositions of spinels (100*Cr/(Cr+Al) ∼59–72; Mg# = 100*Mg/(Mg+Fe^(2+)) ∼40–66) present as inclusions in the olivine phenocrysts. The presence of Fo_(90.5) olivine in the HSDP lavas requires magmas with ∼16 wt % MgO in the ML and MK plumbing systems. Rare dunite xenoliths are also present in the drill core lavas. While compositionally homogeneous within a given xenolith, the six xenoliths contain olivines that span a wide range of forsterite contents (78.3–89.2 mol %). Spinels in these xenoliths are chrome-rich, have Mg# between 31 and 66, and define two populations on the basis of TiO_2 contents. Whole-rock compositions for the ML and MK tholeiites define olivine control lines on MgO-oxide diagrams, and the relationship between whole-rock MgO and olivine phenocryst abundance in these lavas suggests that the lavas with >12 wt % MgO have accumulated olivine. Comparing the weighted bulk composition of all of the MK tholeiites in the drill core with a calculated parental magma suggests that, on average, the MK tholeiites entrained most of the olivine phenocrysts that crystallized from their parental liquids. Although deformed olivines in Hawaiian lavas are widely thought to represent disaggregated dunite xenoliths, none of the majoror minor-element data on the strained or unstrained olivine phenocrysts suggest that the strained olivines in the HSDP lavas are exotic. We suggest that most of the olivine phenocrysts in a given flow, whether strained or unstrained, are closely related to the evolved liquid that now forms the groundmass. This is consistent with observed correlations between isotopic systems measured on olivine separates (e.g., O, He) and isotopic systems dominated by groundmass (e.g., Nd, Pb)

Enhanced nonlinear imaging through scattering media using transmission matrix based wavefront shaping

Despite the tremendous progresses in wavefront control through or inside complex scattering media, several limitations prevent reaching practical feasibility for nonlinear imaging in biological tissues. While the optimization of nonlinear signals might suffer from low signal to noise conditions and from possible artifacts at large penetration depths, it has nevertheless been largely used in the multiple scattering regime since it provides a guide star mechanism as well as an intrinsic compensation for spatiotemporal distortions. Here, we demonstrate the benefit of Transmission Matrix (TM) based approaches under broadband illumination conditions, to perform nonlinear imaging. Using ultrashort pulse illumination with spectral bandwidth comparable but still lower than the spectral width of the scattering medium, we show strong nonlinear enhancements of several orders of magnitude, through thicknesses of a few transport mean free paths, which corresponds to millimeters in biological tissues. Linear TM refocusing is moreover compatible with fast scanning nonlinear imaging and potentially with acoustic based methods, which paves the way for nonlinear microscopy deep inside scattering media

Neutralino-hadron scattering in the NMSSM

We provide a scan of the parameter space for neutralino-hadron scattering in the next-to-minimal supersymmetric standard model using an updated value for the strange quark sigma commutator. These results also take into account constraints from WMAP data on the relic density and new constraints from the Large Hadron Collider. We find that the resultant spin-independent cross sections are smaller in magnitude than those found in recent results obtained within the constrained minimal supersymmetric standard model, yet still great enough to feasibly allow for detection in the case of bino-like neutralinos.Comment: 4 pages 5 figure

“Throwing the Baby Out With the Bathwater”: Parenting Coordination and Pennsylvania’s Decisions to Eliminate its Use

Parenting coordination is a relatively new ADR practice utilized by courts to assist in resolving high conflict divorce cases. Though considered controversial by some, it can also serve as an effective tool for divorced parents who struggle with regular co-parenting decisions. Parenting coordination is defined as: A child-focused alternative dispute resolution process in which a mental health or legal professional with mediation training and experience assists high conflict parents to implement their parenting plan by facilitating the resolution of their disputes in a timely manner, educating parents about children’s needs, and with prior approval of the parties and/or court, making decisions within the scope of the court order or appointment contract. Parenting coordination is a “legal-psychological hybrid” and does not neatly fit the mediation-arbitration model, but is rather a distinct form of alternative dispute resolution (ADR)

“Throwing the Baby Out With the Bathwater”: Parenting Coordination and Pennsylvania’s Decisions to Eliminate its Use

Parenting coordination is a relatively new ADR practice utilized by courts to assist in resolving high conflict divorce cases. Though considered controversial by some, it can also serve as an effective tool for divorced parents who struggle with regular co-parenting decisions. Parenting coordination is defined as: A child-focused alternative dispute resolution process in which a mental health or legal professional with mediation training and experience assists high conflict parents to implement their parenting plan by facilitating the resolution of their disputes in a timely manner, educating parents about children’s needs, and with prior approval of the parties and/or court, making decisions within the scope of the court order or appointment contract. Parenting coordination is a “legal-psychological hybrid” and does not neatly fit the mediation-arbitration model, but is rather a distinct form of alternative dispute resolution (ADR)

The Last Best Hope: Are Voluntary Conservation Agreements Effective Tools for Protecting Imperiled Species?

Candidate Conservation Agreements with Assurances, or CCAAs, are little known, voluntary conservation agreements that protect imperiled wildlife on private lands. These agreements have emerged over the past decade and have had mixed results in providing adequate protections for candidate species. Landowners, private industries, state and federal agencies, and environmental nonprofits, are using CCAAs as tools to eliminate the need for an endangered species listing. An Endangered Species Act listing can lead to land-use uncertainty for private landowners and this threat is the main incentive to enroll in a CCAA. When landowners enroll in CCAAs they are agreeing to provide specific protections for the species on their property, and in return they receive assurances. Like an insurance policy, assurances promise landowners that if the species is listed in the future, no further land-use restrictions will be enforced. The fluvial Arctic grayling CCAA, and several greater sage grouse CCAAs across the West, are being used along with other conservation strategies to prevent the listing of both species. These agreements have demonstrated unprecedented voluntary collaboration, but it is still unclear whether or not they can stand alone as effective protection for species in lieu of an Endangered Species listing. Monitoring of CCAAs to ensure that enrollees are complying with the agreements, and that the program is benefitting the species, is dependent on resources and transparency. Both the sage grouse and arctic grayling CCAAs have been studied and written about on an individual level. However, CCAAs and how they influence conservation on a larger scale, remain largely uncharted and should be watched in the future

Non-unique factorization of polynomials over residue class rings of the integers

We investigate non-unique factorization of polynomials in Z_{p^n}[x] into irreducibles. As a Noetherian ring whose zero-divisors are contained in the Jacobson radical, Z_{p^n}[x] is atomic. We reduce the question of factoring arbitrary non-zero polynomials into irreducibles to the problem of factoring monic polynomials into monic irreducibles. The multiplicative monoid of monic polynomials of Z_{p^n}[x] is a direct sum of monoids corresponding to irreducible polynomials in Z_p[x], and we show that each of these monoids has infinite elasticity. Moreover, for every positive integer m, there exists in each of these monoids a product of 2 irreducibles that can also be represented as a product of m irreducibles.Comment: 11 page

Rendering Affective Atmospheres: The Visual Construction of Spatial Knowledge About Urban Development Projects

Renderings are digital visualisations of urban development projects in the field of urban design that aim to create spatial knowledge about future-built urban environments, which we also refer to as imaginaries. In our contribution, we ask how visual artists design renderings, how they try to influence spatial knowledge about future urban spaces, and in which processes renderings are produced. Using the cases of the Eko Atlantic City project in Lagos (Nigeria) and the Hudson Yards project in New York City (USA) as examples, it will be shown empirically how specialized visual artists try to make urban development projects appear convincing and appealing. The analyses show that visual artists particularly use design elements such as photorealistic aesthetics and lighting to make the presentations of the planned building projects desirable. They also attempt to make them appear coherent in their built environment by digitally collaging different imaginary elements. Interestingly, only a limited number of image types are used. They can nevertheless put the imaginary space of the planned building projects in a positive light, create pleasant affective atmospheres, and appeal to a wide audience. By visually constructing imaginaries about urban development projects and thus influencing the subjective spatial knowledge of stakeholders and a broader public, renderings develop power. The constructed - and widely shared - imaginary space can guide investment and influence planning processes and the materialization of the built project

The Problem of Vaccination Noncompliance: Public Health Goals and the Limitations of Tort Law

Imposing tort liability on parents who fail to vaccinate their children would not serve the public health and public policy interests that drive childhood immunization efforts. The public policy goals of vaccination are to slow the spread of disease and to reduce mortality and morbidity. Our country’s public health laws already play a substantial role in furthering these goals. Although application of tort law may be an appropriate response to some of the problems that result from vaccination noncompliance, there also is a need to cultivate public understanding of the connection between individual actions and collective wellbeing. It is doubtful that the imposition of individual tort liability will achieve this goal