2,571 research outputs found
Feasibility analysis of GNSS-based navigation for LUMIO mission
No full textThe paper presents the design of a realistic model of the GNSS constellations GPS and Galileo to perform a navigation performances analysis in lunar environment. Starting from the visibility analysis, the link-budget of each visible GNSS spacecraft is estimated using for each one realistic data for the transmitted power and environmental and system parameters. The navigation performances are evaluated in this scenario. The model implemented is applied to the trajectory of the LUMIO CubeSat mission and the results are commented. LUMIO is a lunar CubeSat mission, on a Halo orbit at the L2 point of the Earth–Moon system, designed to observe the measured meteoroid impacts on the far side of the Moon. LUMIO has been designed to perform autonomous onboard navigation with an accuracy better than 30 km for more than 99.7% of the time. The navigation analysis in this work can be compared to such a requirement to evaluate if a GNSS-based navigation solution could be employed as well
Longmen Da Fengxian si de qiyuan ji diwei” ???????????? (“On the Beginning and Status of Big Fengxian Temple at the Longmen Grotto”)
No full textThe article is a Chinese translation (unchecked by the author) of a preliminary version of Forte, “The Origins and Role of the Great Fengxian Monastery ???? at Longmen,” 1996. Published under the author’s Chinese name of Fu Andun ???
Longitudinal injection schemes for the CERN PS Booster at 160 MeV including space charge effects
No full textThermal behaviour of tobermorite from N'Chwaning II mine (Kalahari Manganese Field, Republic of South Africa) II. Crystallographic and spectroscopic study of tobermorite 10 Å
No full textX-ray diffraction studies of "tobermorite 10 angstrom", obtained through heating of the "anomalous" tobermorite 11 angstrom from N'Chwaning II mine (Kalahari Manganese Field, RSA), show the widespread structural disorder that arises during the transformation from tobermorite 11 angstrom to the 10 angstrom phase. The diffraction pattern of the final phase points to an orthorhombic (or pseudo-orthorhombic) "family cell" with a 11.2, b' 3.67, c 20.1 angstrom. The b' unit-cell parameter is typical for the average structure of the members of the tobermorite group. Completely streaked reflections double the b' periodicity, indicating that the true b parameter is equal to 7.3 angstrom, which is characteristic for wollastonite-like chains. The a unit-cell parameter of the "family cell" of tobermorite 10 angstrom is doubled with respect to that of the other tobermorite-group minerals (11.2 instead of 5.6 angstrom). Through the application of the OD theory, a structural model is proposed and the atomic positions of one of the two possible MDO polytypes have been refined, using a set of 399 reflections, up to a R-1 = 15.7 %. Notwithstanding the quite high reliability index, the main structural features of tobermorite 10 angstrom could be observed. Its structure consists of layers of six- and seven-fold coordinated Ca cations, linked together by double silicate chains, with a conformation similar to that present in xonotlite. Additional information has been obtained through Si-29 nuclear magnetic resonance (NMR) and micro-Raman spectroscopies. Si-29 Single Pulse Excitation Magic Angle Spinning (SPEMAS) spectra show the occurrence of two main sets of peaks, related to Q(2) and Q(3) sites, respectively, confirming the presence of double silicate chains. An additional weak peak at -106 ppm, typical of Q(4) sites, may be interpreted as due to minor amorphous silica. In addition, the Si-29 Cross-Polarization Magic Angle Spinning (CPMAS) spectra indicate that H2O is present in tobermorite 10 angstrom and that Si-OH bonds are present prevalently in the bridging Q(3) tetrahedra. The results of the micro-Raman spectroscopy are in agreement with those of the NMR study, indicating the occurrence of double chains. The observed conformation of the double chains can be easily reached through the shrinking of clinotobermorite-like chains. An intermediate clinotobermorite-like phase was actually observed during the topotactic transformation from tobermorite 11 angstrom to tobermorite 10 angstrom. The comparison between structural, X-ray powder diffraction, and micro-Raman spectroscopic data on tobermorite 10 angstrom and oyelite allows to exclude that oyelite may be the natural counterpart of tobermorite 10 angstrom. On the contrary, similarities between the tobermorite 10 angstrom obtained in this study and its analogue obtained in hydrothermal synthesis experiments are clear
Materials recovery from waste liquid crystal displays: A focus on indium
No full textIn the present work the recovery of indium and of the polarizing film from waste liquid crystal displays was experimentally investigated in the laboratory. First of all, the polarizing film was removed by employing a number of different techniques, including thermal and chemical treatments. Leaching of indium was then performed with HCl 6 N, which allowed solubilisation of approximately 90% In (i.e. 260 mg In per kg of glass) at room temperature, without shredding. Indium recovery from the aqueous phase was then investigated through solvent extraction with polyethylene glycol (PEG)-based aqueous biphasic systems. Indium extraction tests through the PEG-ammonium sulphate-water system were conducted as a function of PEG concentration, salt concentration and molecular weight of PEG, using 1,10 phenanthroline as a ligand. The experimental results demonstrated that indium partitioning between the bottom (salt-rich) and the top (PEG-rich) phase is quite independent on the composition of the system, since 80-95% indium is extracted in the bottom phase and 5-20% in the top phase; it was also found that when PEG concentration is increased, the ratio between the bottom and the upper phase volumes decreases, resulting in an increase of indium concentration in the bottom phase (at [PEG]=25% w/w, indium concentration in the bottom phase is ~30% higher than the initial concentration before the extraction)
New Land Values Patterns in the Space of the Italian Metropolitan Areas: The Case of the Logistic Retro-port in Naples
No full textAbstractIn the perspective of the new level of government - the Metropolitan city of Naples- one of the most challenging projects concerns the redevelopment of the ex-industrial areas located in the eastern zone of the city, characterized by the presence of the port. One of the reasons for the slowness in which the program of urban regeneration proceed (NaplEst) is the generic identification of the demand for new functions in an area which plays a strategic role in the metropolitan context. The article, starting from an analysis of the land values in the space of the metropolitan city, wants to highlight their evolution. With reference to the land values in the peripheral areas, it is possible to see new values, more significant with regard to the past. In this new and discontinued framework of land values, a more realistic proposal for the regeneration of the retro-port is relevant: the logistic function, in accordance with the “State Plan of a first Intervention for the South industrial ports”
SCRITTI MIEI A PORTOFERRAIO
No full textStoria della detenzione del patriota e gentiluomo pisano Alamanno Agostini, accusato senza prove assieme a Guerrazzi di trame mazziniane, nel forte Stella di Portoferraio dal settembre al dicembre 1833. Segue la trascrizione critica ed annotata del suo Diario inedito, che racconta il dramma personale e familiare di un uomo, che non riesce a capacitarsi della sua prigionia senza processo. E' un documento prezioso sulle condizioni di vita nelle carceri granducali del primo Ottocento
The main will of the patients of a private Italian IVF clinic for their aneuploid/affected blastocysts would be donation to research: a currently forbidden choice
No full textPurpose: Surplus cryopreserved affected/aneuploid blastocysts may be obtained after in vitro fertilization (IVF) treatments with preimplantation genetic testing (PGT). These embryos are considered not suitable for transfer and may be discarded. Currently, in Italy, an embryo disposition decision (EDD) is not allowed and the frozen/vitrified blastocysts (even if affected/aneuploid) should be kept cryopreserved indefinitely. In this peculiar clinical, social, and legislative scenario, we aimed at assessing the attitudes of the patients towards the fate of these embryos, in case the local regulation would be changed and allow an EDD regarding the surplus affected/aneuploid embryos obtained after PGT. Methods: A questionnaire with multiple answers was submitted to 832 patients who obtained affected/aneuploid embryos during a PGT cycle at our private IVF center. They were asked to choose between three putative options with related reasons: everlasting cryopreservation (only option currently available); discard or donate them to research. Results: Overall, 149 patients (18%; 85 women and 64 men) answered the questionnaire. Among them, 84% (n = 126) would choose to donate their affected/aneuploid blastocysts to research, 9% (n = 13) would discard them and only 7% (n = 10) would keep them cryopreserved indefinitely. Conclusions: Donation of the affected/aneuploid blastocysts is the option chosen from most of the respondents (84%; 15% of the eligible patients). These patients are motivated from the altruistic will of incentivating the progress in IVF and/or stem cell research and supporting future couples to limit/solve their infertility/health issues
Six Overtures Composed by C. F. Abel. Adapted for the Harpsichord or Piano Forte : being Opera First / By the Author
No full textSIX OVERTURES COMPOSED BY C. F. ABEL. ADAPTED FOR THE HARPSICHORD OR PIANO FORTE : BEING OPERA FIRST / BY THE AUTHOR
Six Overtures Composed by C. F. Abel. Adapted for the Harpsichord or Piano Forte : being Opera First / By the Author (1)
Cover (1)
Titelseite (2)
Overture I. (3)
Overture II. (8)
Overture III. (12)
Overture IV. (16)
Overture V. (20)
Overture VI. (24
Fatal infections in andrology. Atypical clinical presentation of a Fournier's disease
No full textBackground: Fournier disease (FD) is a worrisome infection of genital area caused by a polimicrobial infection and characterized by a rapid progression to necrosis. Scrotum, perineum and lower abdomen represent the primary sites of origin. Clinical presentation and laboratory strongly suggest FD, but if not precociously diagnosed, it may quickly evolve into septic syndrome and patient's death. Case report: A 62 years old Caucasian male presented for fever and penile gross oedema recently occurred. No history of previous urinary tract infection, hematuria or genital trauma was referred. He did not complain any storage or voiding low urinary tract symptom (LUTS); no foci of infection in genitoperineal area was observed nor urethral discharge. The ultrasound (US) revealed a disomogeneous broad thickening of subcutaneous tissues with increased vascularity on Color-Doppler. When the penis was manipulated in order to reduce oedema, retract foreskin and evaluate the glans, clinical parametres rapidly worsened and the patient developed a septic shock with blood pressure falling down, dyspnoea and tachyarrhythmia, and he was fastly sent to Intensive Care Unit where it has been hemodynamically stabilized and subjected to antibiotic therapy. Considering the clinical absence of gangrene's foci, we opted for a conservative treatment by maintaining bladder catheter and drug therapy
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