Photodissociation of pernitric acid (HO2NO2) at 248 nm

The photodissociation of pernitric acid (PNA) was studied at 248 nm. The quantum yield for production of OH radicals is 34 + or - 16 percent. The yield of OH from PNA was measured relative to that of H2O2. The translational and rotational energy content of the OH photofragment from PNA was characterized. A fluorescent emission was also observed and characterized. It is attributed to electronically excited NO2 produced in the PNA photodissociation. A maximum yield of 30 percent for NO2 production was determined. The intensity of this emission, and a mass spectrometric peak at m/e = 33, were found to be useful means of characterizing the purity of the PNA sample

A near-real-time full-parallax holographic display for remote operations

A near real-time, full parallax holographic display system was developed that has the potential to provide a 3-D display for remote handling operations in hazardous environments. The major components of the system consist of a stack of three spatial light modulators which serves as the object source of the hologram; a near real-time holographic recording material (such as thermoplastic and photopolymer); and an optical system for relaying SLM images to the holographic recording material and to the observer for viewing

Ritual Irony

Ritual Irony is a critical study of four problematic later plays of Euripides: the Iphigenia in Aulis, the Phoenissae, the Heracles, and the Bacchae.Examining Euripides' representation of sacrificial ritual against the background of late fifth-century Athens, Helene P. Foley shows that each of these plays confronts directly the difficulty of making an archaic poetic tradition relevant to a democratic society. She explores the important mediating role played by choral poetry and ritual in the plays, asserting that Euripides' sacrificial metaphors and ritual performances link an anachronistic mythic ideal with a world dominated by "chance" or an incomprehensible divinity.Foley utilizes the ideas and methodology of contemporary literary theory and symbolic anthropology, addressing issues central to the emerging dialogue between the two fields. Her conclusions have important implications for the study of Greek tragedy as a whole and for our understanding of Euripides' tragic irony, his conception of religion, and the role of his choral odes.Assuming no specialized knowledge, Ritual Irony is aimed at all readers of Euripidean tragedy. It will prove particularly valuable to students and scholars of classics, comparative literature, and symbolic anthropology.Ritual Irony is a critical study of four problematic later plays of Euripides: the Iphigenia in Aulis, the Phoenissae, the Heracles, and the Bacchae.Examining Euripides' representation of sacrificial ritual against the background of late fifth-century Athens, Helene P. Foley shows that each of these plays confronts directly the difficulty of making an archaic poetic tradition relevant to a democratic society. She explores the important mediating role played by choral poetry and ritual in the plays, asserting that Euripides' sacrificial metaphors and ritual performances link an anachronistic mythic ideal with a world dominated by "chance" or an incomprehensible divinity. Foley utilizes the ideas and methodology of contemporary literary theory and symbolic anthropology, addressing issues central to the emerging dialogue between the two fields. Her conclusions have important implications for the study of Greek tragedy as a whole and for our understanding of Euripides' tragic irony, his conception of religion, and the role of his choral odes.Assuming no specialized knowledge, Ritual Irony is aimed at all readers of Euripidean tragedy. It will prove particularly valuable to students and scholars of classics, comparative literature, and symbolic anthropology

Short-term climate response to a freshwater pulse in the Southern Ocean

The short-term response of the climate system to a freshwater anomaly in the Southern Ocean is investigated using a coupled global climate model. As a result of the anomaly, ventilation of deep waters around Antarctica is inhibited, causing a warming of the deep ocean, and a cooling of the surface. The surface cooling causes Antarctic sea-ice to thicken and increase in extent, and this leads to a cooling of Southern Hemisphere surface air temperature. The surface cooling increases over the first 5 years, then remains constant over the next 5 years. There is a more rapid response in the Pacific Ocean, which transmits a signal to the Northern Hemisphere, ultimately causing a shift to the negative phase of the North Atlantic Oscillation in years 5–10

Ocular attention-sensing interface system

The purpose of the research was to develop an innovative human-computer interface based on eye movement and voice control. By eliminating a manual interface (keyboard, joystick, etc.), OASIS provides a control mechanism that is natural, efficient, accurate, and low in workload

Holographic enhanced remote sensing system

The Holographic Enhanced Remote Sensing System (HERSS) consists of three primary subsystems: (1) an Image Acquisition System (IAS); (2) a Digital Image Processing System (DIPS); and (3) a Holographic Generation System (HGS) which multiply exposes a thermoplastic recording medium with sequential 2-D depth slices that are displayed on a Spatial Light Modulator (SLM). Full-parallax holograms were successfully generated by superimposing SLM images onto the thermoplastic and photopolymer. An improved HGS configuration utilizes the phase conjugate recording configuration, the 3-SLM-stacking technique, and the photopolymer. The holographic volume size is currently limited to the physical size of the SLM. A larger-format SLM is necessary to meet the desired 6 inch holographic volume. A photopolymer with an increased photospeed is required to ultimately meet a display update rate of less than 30 seconds. It is projected that the latter two technology developments will occur in the near future. While the IAS and DIPS subsystems were unable to meet NASA goals, an alternative technology is now available to perform the IAS/DIPS functions. Specifically, a laser range scanner can be utilized to build the HGS numerical database of the objects at the remote work site

Rapid submarine ice melting in the grounding zones of ice shelves in West Antarctica.

Enhanced submarine ice-shelf melting strongly controls ice loss in the Amundsen Sea embayment (ASE) of West Antarctica, but its magnitude is not well known in the critical grounding zones of the ASE's major glaciers. Here we directly quantify bottom ice losses along tens of kilometres with airborne radar sounding of the Dotson and Crosson ice shelves, which buttress the rapidly changing Smith, Pope and Kohler glaciers. Melting in the grounding zones is found to be much higher than steady-state levels, removing 300-490 m of solid ice between 2002 and 2009 beneath the retreating Smith Glacier. The vigorous, unbalanced melting supports the hypothesis that a significant increase in ocean heat influx into ASE sub-ice-shelf cavities took place in the mid-2000s. The synchronous but diverse evolutions of these glaciers illustrate how combinations of oceanography and topography modulate rapid submarine melting to hasten mass loss and glacier retreat from West Antarctica

Skin disorders in Parkinson's disease:potential biomarkers and risk factors

Astrid-Helene Ravn, Jacob P Thyssen, Alexander Egeberg Department of Dermatology and Allergy, Herlev and Gentofte Hospital, University of Copenhagen, Hellerup, Denmark Abstract: Parkinson’s disease (PD) is one of the most common neurodegenerative disorders, characterized by a symptom triad comprising resting tremor, rigidity, and akinesia. In addition, non-motor symptoms of PD are well recognized and often precede the overt motor manifestations. Cutaneous manifestations as markers of PD have long been discussed, and cumulative evidence shows an increased prevalence of certain dermatological disorders in PD. Seborrheic dermatitis is considered to occur as a premotor feature of PD referable to dysregulation of the autonomic nervous system. Also, an increased risk of melanoma has been observed in PD. Light hair color is a known risk factor for melanoma, and interestingly the risk of PD is found to be significantly higher in individuals with light hair color and particularly with red hair. Furthermore, several studies have reported a high prevalence of PD in patients with bullous pemphigoid. Moreover, a 2-fold increase in risk of new-onset PD has been observed in patients with rosacea. Besides the association between PD and various dermatological disorders, the skin may be useful in the diagnosis of PD. Early PD pathology is found not only in the brain but also in extra-neuronal tissues. Thus, the protein α-synuclein, which is genetically associated with PD, is present not only in the CNS but also in the skin. Hence, higher values of α-synuclein have been observed in the skin of patients with PD. Furthermore, an increased risk of PD has been found in the Cys/Cys genotype, which is associated with red hair color. In this review, we summarize the current evidence of the association between PD and dermatological disorders, the cutaneous adverse effects of neurological medications, and describe the potential of skin protein expression and biomarkers in identification of risk and diagnosis of PD. Keywords: Parkinson’s disease, melanoma, rosacea, seborrheic dermatitis, bullous pemphigoi