395 research outputs found

    A Remote Laser-mass Spectrometer for Determination of Elemental Composition

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    Determination of the elemental composition of lunar, asteroid, and planetary surfaces is a major concern for science and resource utilization of space. The science associated with the development of a satellite or lunar rover laser-mass spectrometer instrument is presented here. The instrument would include a pulsed laser with sufficient energy to create a plasma on a remote surface. Ions ejected from this plasma travel back to the spacecraft or rover, where they are analyzed by a time-of-flight mass spectrometer, giving the elemental and isotope composition. This concept is based on the LIMA-D instrument on board the former Soviet Union Phobos-88 spacecraft sent to Mars. A laser-mass spectrometer placed on a rover or satellite would substantially improve the data return over alternative techniques. The spatial resolution would be centimeters, and a complete mass spectrum could be achieved in one laser shot. An experiment is described that demonstrates these features. A 400 mj Nd:YAG laser is focused, to an intensity of 10(exp 11) w/sq cm, onto a Al, Ag, Cu, Ge, or lunar simulant target. A plasma forms from which ions are ejected. Some of these ions travel down an 18-m evacuated flight tube to a microchannel plate detector. Alternatively, the ions are captured by an ion trap where they are stored until pulsed into a 1-m time-of-flight mass spectrometer, giving the elemental composition of the remote surface. A television camera monitors the plasma plume shape, and a photodiode monitors the temporal plasma emission . With this system, ions of Al, Ag, Cu, Ge, and lunar simulant have been detected at 18 m. The mass spectrum from the ion trap and 1-m time-of-flight tube will be presented

    Sex Differences of Uncinate Fasciculus Structural Connectivity in Individuals with Conduct Disorder.

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    Conduct disorder (CD) is one of the most common behavior disorders in adolescents, such as impulsivity, aggression, and running from school. Males are more likely to develop CD than females, and two previous diffusion tensor imaging (DTI) studies have demonstrated abnormal microstructural integrity in the uncinate fasciculus (UF) in boys with CD compared to a healthy control group. However, little is known about changes in the UF in females with CD. In this study, the UF was illustrated by tractography; then, the fractional anisotropy (FA), axial diffusivity, mean diffusion, radial diffusivity (RD), and the length and number of the UF fiber bundles were compared between male and female patients with CD and between female patients with CD and female healthy controls, as well as between males with CD and healthy males. We found that males with CD showed significantly higher FA of the bilateral UF and significantly lower RD of the left UF when comparing with females with CD. Meanwhile, significantly higher FA and lower RD of the bilateral UF were also found in boys with CD relative to the male healthy controls. Our results replicated previous reports that the microstructural integrity of the UF was abnormal in boys with CD. Additionally, our results demonstrated significant gender effects on the UF of patients with CD, which may indicate why boys have higher rates of conduct problems than girls.published_or_final_versio

    Cost Function Statistical Analysis in Double Random Phase Encoding

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    We examine the Amplitude-Encoding (AE) case of the Double Random Phase Encoding (DRPE) technique. A cost function is the function we use to evaluate an attempted decryption with our original input image. For systems with a relatively small key-space we can evaluate the output of every key to get an overall idea of the spread of these keys in key-space. However for larger systems this is not practical. Based on a normalised root mean squared cost function we wish to identify expressions for the mean and variance of the output (decrypted) intensity for a sample set of keys in a large system (256x256 pixels)

    Neutralisation of SARS-CoV-2 by monoclonal antibody through dual targeting powder formulation

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    Neutralising monoclonal antibody (mAb) is an important weapon in our arsenal for combating respiratory viral infections. However, the effectiveness of neutralising mAb has been impeded by the rapid emergence of mutant variants. Early administration of broad-spectrum mAb with improved delivery efficiency can potentially enhance efficacy and patient outcomes. WKS13 is a humanised mAb which was previously demonstrated to exhibit broad-spectrum activity against SARS-CoV-2 variants. In this study, a dual targeting formulation strategy was designed to deliver WKS13 to both the nasal cavity and lower airways, the two critical sites of infection caused by SARS-CoV-2. Dry powders of WKS13 were first prepared by spray drying, with cyclodextrin used as stabiliser excipient. Two-fluid nozzle (TFN) was used to produce particles below 5 μm for lung deposition (C-TFN formulation) and ultrasonic nozzle (USN) was used to produce particles above 10 μm for nasal deposition (C-USN formulation). Gel electrophoresis and size exclusion chromatography studies showed that the structural integrity of mAb was successfully preserved with no sign of aggregation after spray drying. To achieve dual targeting property, C-TFN and C-USN were mixed at various ratios. The aerosolisation property of the mixed formulations dispersed from a nasal powder device was examined using a Next Generation Impactor (NGI) coupled with a glass expansion chamber. When the ratio of C-TFN in the mixed formulation increased, the fraction of particles deposited in the lung increased proportionally while the fraction of particles deposited in the nasal cavity decreased correspondingly. A customisable aerosol deposition profile could therefore be achieved by manipulating the mixing ratio between C-TFN and C-USN. Dual administration of C-TFN and C-USN powders to the lung and nasal cavity of hamsters, respectively, was effective in offering prophylactic protection against SARS-CoV-2 Delta variant. Viral loads in both the lung tissues and nasal wash were significantly reduced, and the efficacy was comparable to systemic administration of unformulated WKS13. Overall, dual targeting powder formulation of neutralising mAb is a promising approach for prophylaxis of respiratory viral infections. The ease and non-invasive administration of dual targeting nasal powder may facilitate the widespread distribution of neutralising mAb during the early stage of unpredictable outbreaks

    2020-05-29/30/31 DAILY UNM GLOBAL HEALTH COVID-19 BRIEFING

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    Executive Summary: NM Highlights: NM case count. Navajo Nation case update. Largest COVID-19 surge in Taos. ABQ BioPark to reopen. NM public schools reopening plan. NM unemployment claims. Rise in domestic and sexual abuse. US Highlights: Protests inspire fear of surge. Trump withdraws from WHO. Last aid bill. No new NY patients. ICE detainees sick. International Highlights: South Korea schools close. Undercounting in Russia. South African overburdened health care system. Economics, Workforce, Supply Chain, PPE: Reusable protection system. Protective household products. Longterm economic challenges. Epidemiology Highlights: Estimate virus reproduction numbers. Hypertension & cardiovascular disease impact on mortality. Gastrointestinal manifestations. Healthcare Policy Recommendations: Immunity passports are bad idea. Evaluation of hand WHO-recommended products. Opioid use-related challenges of COVID-19 management. Practice Guidelines: NICE guidelines on COVID-19 and acute kidney injury. Example of rapid conversion of an outpatient psychiatric hospital to a virtual telepsychiatry clinic. JAMA recommendations on conducting and reporting COVID-19 clinical research. Testing: Comparison of 4 antigen tests. Validation of antibody assays. Drugs, Vaccines, Therapies, Clinical Trials: Encouraging results of Ruxolitinib phase II RCT. Benefits of adjunctive herbal medicine. Potential inhibitors of viral protease screened. Anticoagulation alone is unlikely to protect from COVID-19 related morbidity and mortality. Open access database Covid19db for COVID-19 drugs. 49 new trials registered. Other Science: COVID-19 collateral damage. Telomere length and COVID-19 outcomes. Wastewater RNA early warning. Neurologic manifestation review. MRI reveals predominant anosmia cases. Self-quarantine weight gain. Immunosuppression vs. cytokine storm. Combatting misinformation

    2020-06-03/04 DAILY UNM GLOBAL HEALTH COVID-19 BRIEFING

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    Executive Summary: NM Highlights: Navajo Nation to end weekend curfew. NM case count. Navajo Nation case updates. Food distribution by PepsiCo. APS to get funding. US Highlights: 5 vaccine candidates. Arizona’s increased cases. Some states postpone primaries. Pork plant infections. Economics, Workforce, Supply Chain, PPE: Impact on global supply chains. Residency selection process disrupted. Facemask filtration efficiency. Resources for underserved countries. Epidemiology Highlights: Morbidity and mortality in Africa. Healthcare Policy Recommendations: Need for social distancing. Psychological support guide. Return to work guidelines. Practice Guidelines: Anesthesia recommendations for ECT. Extracorporeal membrane oxygenation outcomes. Testing: Roche Elecsys IL-6 test is authorized by FDA to identify severe inflammatory response. Drugs, Vaccines, Therapies, Clinical Trials: HCQ RCT does not show disease prevention. Lancet HCQ study retraction. Adjunctive convalescent plasma did not show clinical improvement. Mixed remdesivir results. Virtual drug screening. Heparin improved survival. Moderna phase 3. Skin science for vaccine development. ECMO therapy. 48 new clinical trials. Other Science: Androgens and poor male outcomes. Trust in science enhances prevention compliance. High VTE prevalence in critically ill

    Quantum fluids of light

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    This article reviews recent theoretical and experimental advances in the fundamental understanding and active control of quantum fluids of light in nonlinear optical systems. In presence of effective photon-photon interactions induced by the optical nonlinearity of the medium, a many-photon system can behave collectively as a quantum fluid with a number of novel features stemming from its intrinsically non-equilibrium nature. We present a rich variety of photon hydrodynamical effects that have been recently observed, from the superfluid flow around a defect at low speeds, to the appearance of a Mach-Cherenkov cone in a supersonic flow, to the hydrodynamic formation of topological excitations such as quantized vortices and dark solitons at the surface of large impenetrable obstacles. While our review is mostly focused on a class of semiconductor systems that have been extensively studied in recent years (namely planar semiconductor microcavities in the strong light-matter coupling regime having cavity polaritons as elementary excitations), the very concept of quantum fluids of light applies to a broad spectrum of systems, ranging from bulk nonlinear crystals, to atomic clouds embedded in optical fibers and cavities, to photonic crystal cavities, to superconducting quantum circuits based on Josephson junctions. The conclusive part of our article is devoted to a review of the exciting perspectives to achieve strongly correlated photon gases. In particular, we present different mechanisms to obtain efficient photon blockade, we discuss the novel quantum phases that are expected to appear in arrays of strongly nonlinear cavities, and we point out the rich phenomenology offered by the implementation of artificial gauge fields for photons.Comment: Accepted for publication on Rev. Mod. Phys. (in press, 2012

    2020-06-22/23 DAILY UNM GLOBAL HEALTH COVID-19 BRIEFING

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    Executive Summary: NM Highlights: Balloon Fiesta postponed. Robot to sanitize ABQ International Sunport. NMSU plan for fall 2020. NM public schools reopening plan. Fewer hospitalizations for COVID-19. NM case update. US Highlights: Visa restrictions. International Highlights: Second wave in South Korea. Epidemiology: Lockdown can suppress COVID-19. Case fatality rate associated with incidence. Predictors of ICU care and ventilators. Anxiety and depression from COVID-19. Asymptomatic patients as source of infection. Heterogeneous populations affect herd immunity. Healthcare Policy Recommendations: New FDA guidance on clinical trials conduct. Practice Guidelines: The guidelines are provided on COVID-19 diagnostics (Infectious Diseases Society of America), respiratory support for COVID-19 patients and optimizing mental care delivery during COVID-19 pandemic. Drugs, Vaccines, Therapies, Clinical Trials: Antithrombotic therapy systematic review. Drug repurposing. 58 new trials. Other Science: Safety of antihypertensives (ACEs and ARBs). Low testosterone linked to escalation of care. Neurological findings and hypercoagulability

    2020-05-22 DAILY UNM GLOBAL HEALTH COVID-19 BRIEFING

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    Executive Summary: NM Highlights: 12 positive cases at NMSU. Short-term rentals restrictions. Dine-in reopening. US Highlights: Models to forecast COVID-19 deaths. Places of worship reopening. Contact tracing at University of Alabama. International Highlights: More deaths among poor. Mortality data in Italy. High death toll in Brazil. Global vaccines fall behind. Italy cases drop. Vaccines to go through India. Epidemiology Highlights: Children not pandemic drivers. Healthcare Policy Recommendations: Burnout of HCWs. NYC surgeons’ response. Foggy glasses tips. Practice Guidelines: Recommendations are provided on surgical strategies during COVID-19, management of hypertension, anesthesia practice, avoiding drug-induced cardiovascular impairments, arrhythmia management, elective surgery reboot, nutritional management, stroke care, neurointerventional surgery, blood management. Testing: Unregulated tests identified. Interpreting test results. Drugs, Vaccines, Therapies, Clinical Trials: Vaccine trials results. Vaccine moves to trials. Monoclonal antibody identified. Hydroxychloroquine no benefit. Adjuvant corticosteroid therapy. Old drugs may benefit. Vaccines inducing antibodies. Other Science: Mortality and CKD/liver disease. Transmission in pregnancy. Pathophysiology insights. Readmission characteristics. Sodium and severity. Simulated sunlight disinfects
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