WEISS-SAT1: A Student Developed Astrobiology Payload for Small Satellite Microgravity Research

The WeissSat-1 is a novel student developed 1U CubeSat designed to support astrobiology payloads for microgravity research. WeissSat-1 is the premier project of the Weiss CubeSat Development Team (WCDT), which was established in August of 2015. The founding WeissSat-1 team consisted of nine students ranging between the ages of 10-12 years old. The mission was: to design, build, test, and fly a CubeSat into space within three years. WeissSat-1, based on the NearSpace Launch Inc’s 1U FastBus structure, was chosen by ELaNa 24 and manifested to fly in the fourth quarter of 2018. WeissSat-1 will carry a lab-on-a-chip system designed to test and validate the survivability of extremophile bacteria in orbit. WeissSat-1 demonstrates the benefit and the importance of engaging and involving students in space-based scientific research throughout the academic pipeline. This work will discuss in detail the technology of the WeissSat-1 mission, and will discuss its impacts on middle school students and their STEM interests. The WCDT contends that if the respective extremophile bacteria on WeissSat-1 are capable of surviving in space, this may have ramifications for the possibility that bacteria may have transferred between planetary bodies over the life of the solar system

Design for future of health and safety in commercial human spaceflight: Towards human-centred exploration medical ecosystem design infrastructure

In conventional practice, medical systems requirements for human spaceflight are considered towards the end phases of a space systems engineering project, leaving little room for the integral medical requirement codification within spacecraft design parameters (NASA ExMC, 2021). As mission character increases in length and remoteness, the level of care and required medical capabilities increase dramatically. The longer and more remote the mission, the greater is the need for human-centeredness. To address that, it is crucial to incorporate a human-centric approach at the early stages of defining key mission architecture parameters and constraints of mission and vehicle/habitat planning. ‘[Human] spaceflight has reached a critical moment where the transition to a human-centric mission architecture must become reality if exploration missions are to succeed’ (Antonsen, 2017). This paper presents an overview of the current state of the art and the diversity of approaches within prospective orbital, suborbital and deep-space missions and scope opportunities within a design for health and safety in commercial space transportation. It provides a rationale for the development of Exploration Medical Ecosystem Design Infrastructure (ExMEDI) as a method and a tool to define medical capabilities required for specific future spaceflight contexts, and optimize design requirements for healthcare systems, such as a medical workstation or medical bay, to best support crew’s health. The ExMEDI would serve as a tool compatible with currently developed system architecture solutions to calculate health risk, and would allow to the integration of human-centered parameters, such as crew profile and needs, as well as medical capabilities, instrumentation, and material requirements, to optimize the solutions for specific mission contexts and characters, such as extended LEO habitation, space hotel facility, lunar space station, or transit to Mars

Ecology of Feral Pigeons: Population Monitoring, Resource Selection, and Management Practices

Feral pigeons (Columba livia) are typically ignored by ornithologists but can be found roosting in the thousands within cities across the world. Pigeons have been known to spread zoonoses, through ectoparasites and excrement they produce. Along with disease, feral pigeons have an economic impact due to the cost of cleanup and maintenance of human infrastructure. Many organizations have tried to decrease pigeon abundances through euthanasia or use of chemicals that decrease reproductive output. However, killing pigeons has been unsuccessful in decreasing abundance, and chemical inhibition can be expensive and must be used throughout the year. A case study at Texas Tech University has found that populations fluctuate throughout the year, making it difficult to manage numbers. To successfully decrease populations, it is important to have a multifaceted approach that includes removing necessary resources (i. e. nest sites and roosting areas) and decreasing the number of offspring through humane techniques

Expanded syringe exchange programs and reduced HIV infection among new injection drug users in Tallinn, Estonia

<p>Abstract</p> <p>Background</p> <p>Estonia has experienced an HIV epidemic among intravenous drug users (IDUs) with the highest per capita HIV prevalence in Eastern Europe. We assessed the effects of expanded syringe exchange programs (SEP) in the capital city, Tallinn, which has an estimated 10,000 IDUs.</p> <p>Methods</p> <p>SEP implementation was monitored with data from the Estonian National Institute for Health Development. Respondent driven sampling (RDS) interview surveys with HIV testing were conducted in Tallinn in 2005, 2007 and 2009 (involving 350, 350 and 327 IDUs respectively). HIV incidence among new injectors (those injecting for < = 3 years) was estimated by assuming (1) new injectors were HIV seronegative when they began injecting, and (2) HIV infection occurred at the midpoint between first injection and time of interview.</p> <p>Results</p> <p>SEP increased from 230,000 syringes exchanged in 2005 to 440,000 in 2007 and 770,000 in 2009. In all three surveys, IDUs were predominantly male (80%), ethnic Russians (>80%), and young adults (mean ages 24 to 27 years). The proportion of new injectors decreased significantly over the years (from 21% in 2005 to 12% in 2009, p = 0.005). HIV prevalence among all respondents stabilized at slightly over 50% (54% in 2005, 55% in 2007, 51% in 2009), and decreased among new injectors (34% in 2005, 16% in 2009, p = 0.046). Estimated HIV incidence among new injectors decreased significantly from 18/100 person-years in 2005 and 21/100 person-years in 2007 to 9/100 person-years in 2009 (p = 0.026).</p> <p>Conclusions</p> <p>In Estonia, a transitional country, a decrease in the HIV prevalence among new injectors and in the numbers of people initiating injection drug use coincided with implementation of large-scale SEPs. Further reductions in HIV transmission among IDUs are still required. Provision of 70 or more syringes per IDU per year may be needed before significant reductions in HIV incidence occur.</p

History, Commemoration, and Belief: Abraham Lincoln in American Memory, 1945-2001

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/91765/1/Schuman-History_Commemoration_Belief.pd

Alignment of the ALICE Inner Tracking System with cosmic-ray tracks

37 pages, 15 figures, revised version, accepted by JINSTALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 micron in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10^5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.Peer reviewe

Transverse momentum spectra of charged particles in proton-proton collisions at s=900\sqrt{s} = 900 GeV with ALICE at the LHC

The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at $\sqrt{s} = 900$ GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region $(|\eta|<0.8)$ over the transverse momentum range $0.15<p_{\rm T}<10$ GeV/$c$. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for $|\eta|<0.8$ is $\left<p_{\rm T}\right>_{\rm INEL}=0.483\pm0.001$ (stat.) $\pm0.007$ (syst.) GeV/$c$ and \left_{\rm NSD}=0.489\pm0.001 (stat.) $\pm0.007$ (syst.) GeV/$c$, respectively. The data exhibit a slightly larger $\left<p_{\rm T}\right>$ than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET.Comment: 20 pages, 8 figures, 2 tables, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/390

Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV

We report on the first measurement of the triangular $v_3$, quadrangular $v_4$, and pentagonal $v_5$ charged particle flow in Pb-Pb collisions at 2.76 TeV measured with the ALICE detector at the CERN Large Hadron Collider. We show that the triangular flow can be described in terms of the initial spatial anisotropy and its fluctuations, which provides strong constraints on its origin. In the most central events, where the elliptic flow $v_2$ and $v_3$ have similar magnitude, a double peaked structure in the two-particle azimuthal correlations is observed, which is often interpreted as a Mach cone response to fast partons. We show that this structure can be naturally explained from the measured anisotropic flow Fourier coefficients.Comment: 10 pages, 4 figures, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/387