252 research outputs found

    Reconstructing the Vitruvian Scorpio: An Engineering Analysis of Roman Field Artillery

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    A Roman scorpio, a small bolt throwing catapult, was constructed and ¿eld tested. The design was based on a reconstruction of a scorpio done by Bucknell University which based its design on the text of the Roman architect, Vitruvius. Once constructed, the scorpio was determined to have a linear relationship between its draw distance and its draw force with a slope of 1389 N/m and the theoretical muzzle velocity was determined to be 55.0 m/s. The average experimental velocity was determined from accelerometer data to be 24 m/s. The e¿ciency of the scorpio was determined to be 19.1%. The maximum range given the launch angle and the experimental velocity was calculated to be 57.9 meters. The actual distance that the bolt traveled was determined to be 54.7 meters. The scorpio was determined to be an e¿ective weapon, able to engage enemy forces over 50 meters away

    Belciana scorpio Galsworthy 1997

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    Belciana scorpio Galsworthy, 1997 (Figs 27–29, 41, 53) Belciana scorpio Galsworthy, 1997, Memoirs of Hong Kong Natural Society 21: 134, Pl. 1: 4. Holotype: male, Hong Kong, Pak Sha E, Saikung (NHM). References: Speidel & Kononenko 1998: 559 (sp. near B. biformis); Kononenko & Pinratana 2013: 277, Pl. 37: 16 (Belciana scorpio). Material examined. CHINA; 1 male, Prov. Yunnan, Mengla, 900 m, 21 ° 27 ′ N, 101 ° 34 ′ E, Sinyaev V. & Team, leg., 1-23.iv. 2006, slide GB 12125, coll. PG; * VIETNAM: 1 female, Prov. Vinh Phu, Tam Dao, 21 ° 34 ′ N ′, 105 ° 20 ′ E, Svihla V. leg., v-vi. 1986, slide GB 7365 female, coll., Behounek, ZSM; 1 male, Tam Dao, 1200 m 11- 16.x. 1992, Sinyaev & Simonov leg., coll. ZFMK. 1 male, Prov. Thai Nguyen, Tam Long, 20 km E Thai Nguyen, 150 m, 21 ° 667 ′ N, 106 °050′ E, local collector leg., vi. 2007, slide, GB 7411, BC ZSM Lep, 48886, coll. GB/ ZSM; * THAILAND: 1 male Prov. Khon Kaefi, Si Chom Piau, 220 m, local collector leg., 26.iii. 2012, slide GB 8251 female, BC ZSM Lep 65175 coll. GB/ ZSM; 1 female Prov. Udon Thani, Ban Nong Phai, 185 m, local collector leg., 30.iii. 2012, slide 8252 female, coll. GB/ ZSM; 1 male, Prov. Nakhon Phanom, Nakhon Phanom, 25 km N, 17 ° 31 ′ 50 ′′ N, 104 ° 54 ′ 30 ′′ E, Buchsbaum U. leg., 8.v. 2008, slide GB/ ZSM N 4295 male, ZSM, 1 female, Prov. Sakhon Nakhon, Phu Pan, 420 m, 17 °05′ 767 ′′N, 103 ° 59 ′ 907 ′′E, Ihle T. leg., 30.v. 2011, slide, GB 12173 female, coll. AB; 1 female, Prov. Nan, Ban Phi Nua, 575 m, 18 ° 56. ′016′′ N, 100 ° 27 ′ 390 ′′ E, Ihle T. leg., 30.v. 2011, slide, GB 12174 female, coll. AB. Note. The species is identified by the original description (Galsworthy 1997) and photographs kindly send us by R. Kendrick (China, Honkong). The specimens labelled as BC ZSM Lep 48886 and BC ZSM Lep 65175 have been used for DNA barcoding. Molecular distance based on the Kimura two-parameter model for COI DNA barcodes between nearest B. scorpio and B. hreblayi is 7,88 % %; the distance between B. scorpio and B. pinratanai is 10,34 %. Diagnosis. Adult (Figs 27–29). Wingspan 31–37 mm. B. scorpio represents own species-group, well distinct from other group of the genus. It differs externally by broader forewing, reduced brown patches in costal area, more clear medial area with reduced ante and postmedial lines and by yellow colouration of hindwing with wide terminal band. Head, thorax and forewing bluish-green, deeper green than in other species; tegulae bordered with blackishbrown. Wing pattern with brown subbasal patch in costal part of wing, reduced to black streak below Cu trunk or not extended costal area, small medial and antemedial streaks in costal area; antemedial line weakly traceable; medial line not expressed of expressed by indistinct diffused blackish dusting sometimes; postmedial line thin, blackish, indistinct; in some specimens whitish suffusion in center of wing expressed; orbicular and reniform marked by white bordering line; subterminal line blackish uninterrupted, or slightly interrupted, with white inner borderline; subapical-apical and subtornal brown patches broader than in other species; subterminal line black, separated for streaks; cilia brown, pale greenish-grey opposite veins. The hindwing with dull greyish-brown terminal margin, pale yellowish-grey towards base and along anal margin, with clearly traceable discal spot and medial fascia. Male genitalia. (Fig. 41). In the male genitalia it differs from the congeners by more sclerotised, broader, slightly curved shape of valva, bearing strong spines on cucullus (autapomorphy, absent in other species), relatively large sacculus and small basal coremata, by shape of uncus, which is almost straight for two thirds, then curved on straight angle, deflected to apex, pointed and hooked apically and by structure of harpe, which is small, flattened, quadrangular, with short ventral extension. Aedeagus short broad lobes of carina, vesica tubular, in joining with carina armed with row of 5–6 strong short cornuti and cluster of small spines and scobinate patch in apical part. Female genitalia (Fig. 53). In the female genitalia ovipositor extended, papillae anales elongate; apophyses anterior and posteriores ones rather long and strong compared with other species; antrum elongated, in apical part split for two sclerotised lobes; ductus bursae short, but longer than in other congeners; joining with elongated partially sclerotised cervix bursae; corpus bursae rounded, with lateral extension. Distribution and bionomics. CHINA (Hong Kong, *Prov. Yunnan), * VIETNAM (Provinces Vinh Phu, Thai Nguyen), * THAILAND (Provinces Khon Kaefi, Udon Thani, Nakhon Phanom, Sakhon Nakhon, Nan, Chiang Mai). The species occurs in lowland and hilly areas with elevation range 150– 900 m. Moths flies in March, April, May; June, August and September.Published as part of Behounek, G., Han, H. L. & Kononenko, V. S., 2015, A revision of the genus Belciana Walker, 1862 with description of three new species (Lepidoptera, Noctuidae: Pantheinae) from East and South East Asia. Revision of Pantheinae, contribution XII, pp. 341-365 in Zootaxa 4027 (3) on pages 353-354, DOI: 10.11646/zootaxa.4027.3.2, http://zenodo.org/record/24147

    Energy performance of PVC-Coated polyester fabric as novel material for the building envelope: Model validation and a refurbishment case study

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    Tensile materials are concurrently becoming more and more utilized in contemporary architecture design, despite a lack of experimental testing and numerical model development to assess their actual effect on the building behavior, even more, if considered integrated in a second-skin system. In this research, the PVC-coated polyester fabric has been selected and tested as tensile second-skin material by using two outdoor comparative test cells to evaluate its performance and to calibrate and validate a numerical model in TRNSYS 18. Then, the validated numerical model has been used in a case study as a second layer in a flexible façade system. In particular, a simulation refurbishment of a typical three-story office building, located in southern Italy, has been investigated with the aim to evaluate its potential benefits from an energy point of view. The results showed that the refurbishment by means of a second-skin system always allows for an energy saving, up to a maximum of 6.1%; also, by exploiting the semi-transparency and the flexibility offered by this material to implement a continuous whole-façade design on the south wall, thus covering with the second-skin both the walls and the openings, the solar gains across the year can be modulated, by minimizing the gains during the summer and maximizing them during the winter, consequently leading to a reduction of the cooling and heating energy demands, for an overall heating energy demand reduction of about 9.8%

    Effectiveness of low-cost non-invasive solutions for daylight and electric lighting integration to improve energy efficiency in historical buildings

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    This article concerns a field study about the use of non-invasive manual lighting and shading control to save energy in listed buildings. The system was chosen to limit cabling and masonry work. The test room consists of an individual office located in a historical building in Southern Italy. The room was retrofitted with two roller shades (semi-transparent and blackout) and six LED-based pendants provided with step-dimming and three Correlated Colour Temperature options. Shading and lighting could be remotely controlled from the desk by six subjects who took part in the test for two weeks each. Behavioural interventions and a set back to default setting at the end of the working day were adopted to improve the test subjects’ energy behaviour. The results show that energy for lighting could be reduced between 15% and 71% compared to European benchmark, with wide range accounting for variability of individual preference and weather conditions. The savings are due to the computer-based work, the communication and engagement campaign, as well as the default settings. The findings suggest that simple manually controlled systems are energy and economic viable solution for listed buildings, since the system accommodates users’ needs, and proper training is provided to the users

    Impact of seasonal thermal energy storage design on the dynamic performance of a solar heating system serving a small-scale Italian district composed of residential and school buildings

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    A centralized solar hybrid heating system serving a small-scale district composed of 6 typical Italian residential buildings and 3 schools located in Naples (southern Italy) has been modelled, simulated and analysed by means of the dynamic software TRNSYS over a 5-year period. The plant is based on the operation of solar thermal collectors connected to a seasonal double U-pipe vertical Borehole Thermal Energy Storage (BTES) in order to address the seasonal misalignment between solar energy supply and thermal energy demand for heating purposes. In this paper a parametric analysis has been performed in order to investigate the performance of the district heating network upon varying the characteristics of the BTES in terms of: (i) thermal conductivity of soil, (ii) thermal conductivity of grout, (iii) U-pipe spacing, (iv) heat carrier fluid, (v) number of Borehole Heat Exchangers (BHEs), as well as (vi) type of BHEs connection (series, parallel or mixed). The primary energy consumption, the equivalent carbon dioxide emissions and the operating costs of the proposed district heating plant have been evaluated based on the simulation results upon varying the plant configurations and then compared with those associated to a conventional Italian decentralized heating system assumed as reference with the main aims of (i) assessing the potential reduction of primary energy consumption, global CO2 equivalent emissions and operating costs, (ii) exploring the influence of BTES characteristics on the overall system performance as well as (iii) establishing some simple rules for the initial design of BTES

    Energy performances assessment of extruded and 3d printed polymers integrated into building envelopes for a south Italian case study

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    Plastic materials are increasingly becoming used in the building envelope, despite a lack of investigation on their effects. In this work, an extruded Acrylonitrile-Butadiene-Styrene panel has been tested as a second-skin layer in a ventilated facade system using a full-scale facility. The experimental results show that it is possible to achieve performances very similar to conventional materials. A numerical model has then been developed and used to investigate the performances of plastic and composite polymer panels as second-skin layers. The experimental data has been used to verify the behavior of the numerical model, from a thermal point of view, showing good reliability, with a root mean square error lower than 0.40◦C. This model has then been applied in different refurbishment cases upon varying: The polymer and the manufacturing technology (extruded or 3D-printed panels). Eight refurbishment case studies have been carried out on a typical office building located in Napoli (Italy), by means of a dynamic simulation software. The simulation results show that the proposed actions allow the reduction of the thermal and cooling energy demand (up to 6.9% and 3.1%, respectively), as well as the non-renewable primary energy consumption (up to 2.6%), in comparison to the reference case study
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