Now showing items 21-40 of 64

    • Heat removal system for shutdown in nuclear thermal rockets and advanced concepts 

      Arias Montenegro, Francisco Javier; Parks, Geoffrey T. (2017-02-09)
      Article
      Open Access
      It is well-known that a nuclear thermal rocket (NTR) cannot be abruptly shut down. After a power manoeuver, the reactor has contaminated itself with fission products and the decay heat released must be removed by maintaining ...
    • Hornet Vespa velutina selective capture by air entrainmen 

      Arias Montenegro, Francisco Javier; Heras Jiménez, Salvador Augusto de las (2019-06-09)
      External research report
      Open Access
      In a previous report, [1], the possibility for selective capture of Vespa velutina by the use of an air cannon was discussed. In this second report, we address the alternative possibility for selective capture of ...
    • Hydro energy harvesting by using compliant surfaces: preliminary experimental assessment 

      Arias Montenegro, Francisco Javier; Heras Jiménez, Salvador Augusto de las (2020-03-13)
      Article
      Restricted access - publisher's policy
      In this work consideration is given for hydro energy harvesting contained in residual water streams. The idea lies in the bifurcation of the stream into two channels separated by a compliant surface or membrane which, ...
    • Hydrokinetic energy conversion using compliant surfaces 

      Arias Montenegro, Francisco Javier; Heras Jiménez, Salvador Augusto de las (2019-05-21)
      Article
      Open Access
      In this work, consideration is given for a novel technology based on the use of compliant surfaces (membranes) for hydrokinetic energy conversion (HEC) from residual waters where the use of traditional turbines is either ...
    • Ice friction for moving the heavy stones at the ancient Pumapunku complex. A first technological approach to the age problem 

      Arias Montenegro, Francisco Javier (2019-06-25)
      External research report
      Open Access
      In this work, ice-lubrication for moving the lithic material at the Tiwanaku complex and particulary at the ancient Pumapunku site is discussed. Ice friction (sliding stones on a sheet of ice) is identified as the most ...
    • Magnetic Mars dust removal technology: a dustblasting technique for Mars 

      Arias Montenegro, Francisco Javier (2018-01)
      Article
      Restricted access - publisher's policy
      It is known that the Martian atmosphere contains a large amount of suspended dust. The saltation process, or gravitational settlement of atmospheric dust, onto the surface of solar arrays can affect the utility of solar ...
    • Magnetic Mars dust-removal technology 

      Arias Montenegro, Francisco Javier; Heras Jiménez, Salvador Augusto de las (springer-Verlag, 2019-02-04)
      Article
      Open Access
      Environmental data recorded by the Mars exploration rovers show that the martian dust is magnetic containing mostly the strong magnetic mineral magnetite ( Fe3O4 ). On the other hand, it is known that dust settling onto ...
    • Magnetic traveling waves induced by mini-coils for sweeping dust of Mars solar arrays 

      Arias Montenegro, Francisco Javier (American Institute of Aeronautics and Astronautics (AIAA), 2018)
      Conference report
      Restricted access - publisher's policy
      In this work consideration is given to dust removal from surface of Mars solar arrays by harnessing the magnetic properties of the dust. Here, it is speculated a possible technique by which localized and properly spaced ...
    • Magnetocaloric anemometry. A novel concept for fluid flow measurement 

      Arias Montenegro, Francisco Javier (2020-06-01)
      Article
      Restricted access - publisher's policy
      Colloidal magnetic fluids (ferrofluids) and its significance with regard to fluid flow measurement is discussed. This concept -which can properly be called as magnetocaloric anemometry, blikewise than hot-wire anemometry ...
    • Marangoni ducts for energy harvesting 

      Arias Montenegro, Francisco Javier; Heras Jiménez, Salvador Augusto de las (ASME International, 2020-08-27)
      Article
      Restricted access - publisher's policy
      The possibility for harnessing energy from thermal or concentration gradients by the use of ducts lined with hydrophobic microcavities is discussed. Utilizing a physical and simplified model an expression for the attainable ...
    • Marangoni stress induced by free-surface for pressure reduction in reverse osmosis 

      Arias Montenegro, Francisco Javier (2018-02-03)
      Article
      Open Access
      Marangoni hydrodynamic motion and its potential technological application in reverse osmosis (RO) process for seawater desalination is discussed. The fundamental core idea in this note is the possibility to take advantage ...
    • Mining the hydrogen peroxide of Mars for monopropellant rocket fuel 

      Arias Montenegro, Francisco Javier (2019-10-10)
      External research report
      Open Access
      Already since the 1970s, hydrogen peroxide (H2O2) has been suggested as a possible oxidizer of the Martian surface, but until only three decades latter it was finally detected. So far, the interest aroused by planetary ...
    • Ocean salt basins energy harvesting 

      Arias Montenegro, Francisco Javier; Heras Jiménez, Salvador Augusto de las (2020-04-02)
      Article
      Restricted access - publisher's policy
      In this work, the potential of harvesting energy from ocean salt basins is discussed. These deep ocean depressions which host thick salts deposits whose salinities could be up to 5-10 times higher than normal seawater open ...
    • Ocean thermal energy conversion by deliberate seawater salinization 

      Arias Montenegro, Francisco Javier (2017-07-27)
      Article
      Open Access
      Consideration is given to the possibility of ocean thermal energy conversion (OTEC) by the deliberate salinization of surface seawater. The proposed technique is similar to traditional OTEC, with one important exception: ...
    • On electrokinetic soil radon mitigation: a first theoretical approach 

      Arias Montenegro, Francisco Javier (2020-11-06)
      Article
      Open Access
      Electrokinetics and its potential significance with regard to soil radon (222Rn) mitigation is investigated. Whereas the use of electrical fields for chemical soil decontamination, also known as electrokinetic remediation ...
    • On inflatable drones for flight time enhancement with particular reference to spectator aerostation 

      Arias Montenegro, Francisco Javier (2018-08-30)
      External research report
      Open Access
      In this note consideration is given to drones - and specially quadcopters, endowed with inflatable and controllable airbags filled with helium which is stored in small and replaceable cartridges. The goal is the a flight ...
    • On osmotic heat engines driven by thermal precipitation-dissolution of saturated aqueous solutions 

      Arias Montenegro, Francisco Javier (2018-11)
      Article
      Restricted access - publisher's policy
      Cyclic thermal precipitation and dissolution of saturated aqueous solutions and its significance with regard to osmotic heat engines (OHEs) is discussed. Here, the thermal dependence of the solubility is harnessed by ...
    • On osmotic heat powered cycles driven by thermal saturation-precipitation of aqueous solutions 

      Arias Montenegro, Francisco Javier (2019-08-09)
      Article
      Restricted access - publisher's policy
      The basis of a novel concept for osmotic heat powered cycles driven by the thermal dependence of the solubility of aqueous solutions inducing the continuous thermal precipitation/dissolution of solute is outlined. In this ...
    • On resuspension and control of reservoir sediments by surface waves and point absorbers 

      Arias Montenegro, Francisco Javier (Elsevier, 2018-07-27)
      Article
      Open Access
      Consideration is given to a novel approach for resuspension and control of sediment in reservoirs which nowadays and after more than six decades of research remains as the most serious technical problem faced by dam industry. ...
    • On the feasibility of a thermodynamic combined heating-depressurization process and the direct use of surface wind energy for mining the Martian regolith for water 

      Arias Montenegro, Francisco Javier (2016-02-29)
      Article
      Open Access
      In this paper a combined heating-depressurization process for mining water from the regolith of Mars is proposed and its feasibility discussed. It is shown that for water content in the regolith \leq 4wt% as found in ...