Presence Of Air Space Research Articles

Prognozowanie procesu emisji wodoru z obudowy turbogeneratora z powstawaniem palnych mieszanin wodorowo-powietrznych i spalaniem pochodni

Predicting the process of hydrogen emission from the turbogenerator housing with the formation of flammable hydrogen-air mixtures and flare combustion The operation of turbogenerators of nuclear and thermal power plants is accompanied by the release of heat, which contributes to the heating of generator components and can lead to an emergency situation (fire). Since As turbogenerators operate for long periods of time, the process of continuous cooling of generator equipment plays an important role, as its overheating can lead to emergency chain reactions, fires, explosions, etc. Analysis of statistical data on the occurrence of emergency situations (fires) related to hydrogen leaks from process equipment indicates insufficient operational qualifications of operational personnel, poor quality of equipment repair, errors of repair personnel and their violation of technical requirements for repairing equipment and their systems, design defects in equipment and systems that ensure its operation. It has been established that the causes of emergency situations are: hydrogen leakage due to leaks in equipment, spontaneous ignition of hydrogen, the presence of air space in turbogenerator equipment, violation of technological regulations, contamination of hydrogen with moisture and pollution, unhermetization of the generator body. Modeling of the hydrogen combustion process during its release from the casing of a turbine-generator was carried out using the example of a power plant engine room. The study showed that the longest hydrogen combustion time will occur when hydrogen is released through holes with geometric size d0 in the range of 0.05--0.1 m (50--100 mm). At larger values of the geometric size of the hole d0 > 0.1 m, the hydrogen burning time is insignificant, and at values of d0 < 0.005 m, the length of the flame burner L does not exceed 1.15 m. The results of the study confirm that hydrogen flame torch combustion can occur as a result of turbogenerator failure. The calculations established the need for fire protection of the supporting metal structures of the engine room to ensure a fire resistance limit of at least 45 minutes under the hydrocarbon curve.

Pathologic Criteria for the Diagnosis of Usual Interstitial Pneumonia vs Fibrotic Hypersensitivity Pneumonitis in Transbronchial Cryobiopsies

Transbronchial cryobiopsy (TBCB) is increasingly used for the diagnosis of fibrosing interstitial pneumonias, but there are few detailed descriptions of the pathologic findings in such cases. It has been proposed that a combination of patchy fibrosis and fibroblast foci with an absence of alternative features is diagnostic of usual interstitial pneumonia (UIP; ie, idiopathic pulmonary fibrosis [IPF]) in TBCB. In this study, we reviewed 121 TBCB in which a diagnosis of fibrotic hypersensitivity pneumonitis (FHP; n = 83) or IPF (n = 38) was made by multidisciplinary discussion and evaluated a range of pathologic features. Patchy fibrosis was found in 65 of 83 (78%) biopsies from FHP and 32of 38 (84%) biopsies from UIP/IPF cases. Fibroblast foci were present in 47 of 83 (57%) FHP and 27 of 38 (71%) UIP/IPF cases. Fibroblast foci/patchy fibrosis combined did not favor either diagnosis. Architectural distortion was seen in 54 of 83 (65%) FHP and 32 of 38 (84%) UIP/IPF cases (odds ratio [OR] for FHP, 0.35; P = .036) and honeycombing in 18 of 83 (22%) and 17 of 38 (45%), respectively (OR, 0.37; P = .014). Airspace giant cells/granulomas were present in 13 of 83 (20%) FHP and 1 of 38 (2.6%) UIP/IPF cases (OR for FHP, 6.87; P = .068), and interstitial giant cells/granulomas in 20 of 83 (24%) FHP and 0 of 38 (0%) UIP/IPF (OR, 6.7 x 106; P = .000). We conclude that patchy fibrosis plus fibroblast foci can be found in TBCB from both FHP and UIP/IPF. The complete absence of architectural distortion/honeycombing favors a diagnosis of FHP, as does the presence of airspace or interstitial giant cells/granulomas, but these measures are insensitive, and many cases of FHP cannot be separated from UIP/IPF on TBCB.

Heat Transfer Measurement within Green Roof with Incinerated Municipal Solid Waste Aggregates

A green roof is composed of a substrate and drainage layers which are fixed on insulation material and roof structure. The global heat resistance (Rc) within a green roof is affected by the humidity content of the substrate layer in which the coarse recycled materials can be used. Moreover, the utilization of recycled coarse aggregates such as incinerated municipal solid waste aggregate (IMSWA) for the drainage layer would be a promising solution, increasing the recycling of secondary resources and saving natural resources. Therefore, this paper aims to investigate the heat transfer across green roof systems with a drainage layer of IMSWA and a substrate layer including recycled tiles and bricks in wet and dry states according to ISO-conversion method. Based on the results, water easily flows through the IMSWAs with a size of 7 mm. Meanwhile, the Rc-value of the green roof system with the dry substrate (1.26 m2 K/W) was 1.7 times more than that of the green roof system with the unsaturated substrate (0.735 m2 K/W). This means that the presence of air-spaces in the dry substrate provided more heat resistance, positively contributing to heat transfer decrease, which is also dependent on the drainage effect of IMSWA. In addition, the Rc-value of the dry substrate layer was about twice that of IMSWA as the drainage layer. No significant difference was observed between the Rc-values of the unsaturated substrate layer and the IMSWA layer.

Functional Significance of Anatomical Accommodation in the Skull of Common Hoopoe, Upupa Epops (Bucerotiformes, Upupidae)

Abstract The present study aims to supplement anatomical data about the cranial skeleton and describe some cranial modifications of the common hoopoe, Upupa epops Linnaeus, 1758, by using several techniques. The common hoopoe has small skull and characterized by presence of air space (pneumatization) within their bones. The degree of pneumatization increased especially within the temporal region. The skull of the common hoopoe possesses different types of kinetic hinges; one hinge locates between frontal and nasal region (frontonasal hinge) allows depression/elevation of upper beak relative to brain case. The other one exhibits between the upper beak and jugal bar (maxilla-jugal hinge). The skull of the common hoopoe characterizes by presence of powerful jaw ligamentous system. One of these ligaments exhibits ossification (Lig. Jugomandibularis medialis). In addition, a long mandibular symphysis observes between the two rami of the anterior third of the lower beak. This mandibular symphysis seems longer in the dorsal surface than the ventral one form ventral gap between the two rami of mandible. These modifications of the cranial skeleton of common hoopoe and jaw ligaments consider features of adaptation for probe mechanism, as well as exhibit its phylogenetic relationship with other avian species.

THE EFFECT OF GREEN FAÇADE SYSTEMS ON DECREASING ENERGY CONSUMPTION IN RESIDENTIAL BUILDINGS A STUDY OF THE USE OF PLANTS ON THE FACADES OF RESIDENTIAL BUILDINGS WITH THE SAME ORIENTATION IN THE NEW URBAN COMMUNITIES

to achieve the best orientation to be applied in each case. It also The research carries out a practical study using the simulation program Design Builder to show a model of a residential unit with the same orientation. This model is applied by the Ministry of Housing, Utilities and Urban Development throughout the Arab Republic of Egypt without regard to the different nature of the climate and orientation, taking into account design determinants and variables (orientation, presence of air space) which are input into the program. It also discusses the results of the practical study of applying the green facade systems on the different orientations (30 ° starting from the North) of the residential unit. This is done using the simulation program on the rate of energy consumption and the comparison of the results in order shows the effect of the green facades systems on reducing the amount of carbon dioxide emitted. Finally, the conclusions of the results of the practical study are reviewed to find a gateway to the application of green facade systems on the facades of same-orientation residential buildings. Moreover, the research determining the basis of analysis and implementation strategies for this system to reduce the consumption of ventilation and mechanical heating. This, in turn, reduces energy consumption, which is the goal of the research.

Clinical significance of tumor cavitation in surgically resected early-stage primary lung cancer

ObjectivesThe prognostic impact of tumor cavitation is unclear in patients with early-stage primary lung cancer. The aim of the present study was to examine the clinicopathological features and prognoses of patients with pathological stage I–IIA (p-stage I–IIA) primary lung cancers harboring tumor cavitation. This study was conducted according to the eighth edition of the TNM classification for lung cancer. Materials and methodsWe examined 602 patients with p-stage I–IIA primary lung cancer out of 890 patients who underwent pulmonary resection from January 2007 through March 2014 and searched for the presence of tumor cavitation, which is defined as the presence of air space within the primary tumor. ResultsA total of 59 out of the 602 patients had tumor cavitation (10%). Compared with patients without tumor cavitation, those with tumor cavitation had a significantly higher frequency of the following characteristics: high serum carcinoembryonic antigen (CEA) level (≥5ng/ml, p=0.027), interstitial pneumonia (p=0.0001), high SUVmax value on FDG-PET scan (≥4.2, p=0.023), tumors located in the lower lobe (p=0.024), large tumor size (>3cm, p=0.002), vascular invasion (66% vs 17%, p<0.0001) and non-adenocarcinoma histology (p=0.025). The overall survival period of patients with tumor cavitation was significantly shorter than that of patients without tumor cavitation (log-rank test: p<0.0001, 5-year OS rate: 56% vs 81%). Tumor cavitation was found to be an independent and significant factor associated with poor prognosis in the multivariate analysis (hazard ratio: 1.76, 95% confidence interval: 1.02–3.10, p=0.042). ConclusionsTumor cavitation is an independent factor for poor prognosis in patients with resected p-stage I–IIA primary lung cancer. Based on our analyses, patients with tumor cavitation should be regarded as a separate cohort that requires more intensive follow-up.

Leaf structure affects a plant's appearance: combined multiple-mechanisms intensify remarkable foliar variegation.

The presence of foliar variegation challenges perceptions of leaf form and functioning. But variegation is often incorrectly identified and misinterpreted. The striking variegation found in juvenile Blastus cochinchinensis (Melastomataceae) provides an instructive case study of mechanisms and their ecophysiological implications. Variegated (white and green areas, vw and vg) and non-variegated leaves (normal green leaves, ng) of seedlings of Blastus were compared structurally with microtechniques, and characterized for chlorophyll content and fluorescence. More limited study of Sonerila heterostemon (Melastomataceae) and Kaempferia pulchra (Zingiberaceae) tested the generality of the findings. Variegation in Blastus combines five mechanisms: epidermal, air space, upper mesophyll, chloroplast and crystal, the latter two being new mechanisms. All mesophyll cells (vw, vg, ng) have functional chloroplasts with dense thylakoids. The vw areas are distinguished by flatter adaxial epidermal cells and central trichomes containing crystals, the presence of air spaces between the adaxial epidermis and a colorless spongy-like upper mesophyll containing smaller and fewer chloroplasts. The vw area is further distinguished by having the largest spongy-tissue chloroplasts and fewer stomata. Both leaf types have similar total chlorophyll content and similar F v/F m (maximum quantum yield of PSII), but vg has significantly higher F v/F m than ng. Variegation in Sonerila and Kaempferia is also caused by combined mechanisms, including the crystal type in Kaempferia. This finding of combined mechanisms in three different species suggests that combined mechanisms may occur more commonly in nature than current understanding. The combined mechanisms in Blastus variegated leaves represent intricate structural modifications that may compensate for and minimize photosynthetic loss, and reflect changing plant needs.

Inward vapor diffusion due to high temperature gradients in experimentally tested large-scale wall assemblies

Inward vapor flow due to high temperature gradients as a moisture source in building envelope has been documented, specifically when the exterior cladding is wetted by rain and then exposed to solar radiation. This phenomenon can bring large amount of undue moisture across the envelope assembly with a risk of damage of the wall elements. In this paper, inward vapor flow is applied to five large-scale monitored wall assemblies using a large-scale experimental facility consisting of a spraying array, a radiation array, and a test hut to provide controlled interior conditions. The variables studied include type of cladding (brick and cement stucco), presence and ventilation of air space, type of exterior sheathing (oriented strand board and extruded polystyrene) and type of interior finish (vinyl wall covering and paint). The results show that the presence of vapor tight interior finishes leads to the accumulation of moisture in the interior gypsum board, even in the presence of a vapor tight exterior sheathing. The presence of an air space reduces, but does not prevent moisture accumulation, while connecting the air space to the outdoor seems sufficient to short-circuit the inward vapor flow and prevent moisture accumulation.

Aspectos da organografia e anatomia foliar do amendoim: genótipos so-53 e so-909

Estudos morfológicos foliares foram efetuados em dois genótipos de amendoim (Arachis hypogaea L.), do grupo Valência, completando informações contidas em trabalhos anteriores. O amendoim, importante cultura mundial, possui o Brasil como centro de origem e dispersão de suas espécies. Nenhuma pesquisa havia sido realizada em organografia nem em anatomia foliar, com genótipos em cultivo no País. O genótipo SO-53 ('Tatu') é suscetível às mais relevantes moléstias fúngicas foliares, ocupando a maior área do amendoim cultivado no Brasil. O SO-909 (PI-259747) tem sido freqüentemente citado como fonte de resistência às moléstias fúngicas foliares, em trabalhos de fitopatologia. Medições macroscópicas, com o uso de paquímetro, bem como observações microscópicas, através de fotomicroscópio, foram efetuadas. Um estudo organográfico foi executado com as folhas de plantas de campo, bem como o estudo anatômico, com o uso de lâminas semipermanentes, mediante desenhos esquemáticos e fotomicroscópio. Os idioblastos encontrados nos folíolos foram divididos em três tipos, de acordo com a presença de tanino, mucilagem ou cristal. Os mucilaginosos foram separados em dois tipos, aparecendo os longos somente na superfície adaxial do limbo foliolar, e os curtos, similares às células epidérmicas, em seção paradérmica em ambas as faces do limbo foliolar. Os pêlos foram separados em três tipos, de acordo com o tamanho: os longos, os curtos e os muito curtos. Todos têm de uma a quatro células basais e uma longa apical. As cerdas², presentes nos dois genótipos, foram classificadas em dois tipos, também conforme o tamanho: as grandes, observadas visualmente, presentes sobretudo na bainha, e as curtas, ao longo da margem foliolar, ambas multicelulares. Algumas características morfológicas, como a presença e freqüência de pêlos; a forma da terminação do sulco na inserção adaxial do pecíolo-raque; a freqüência de cerdas e a espessura da lâmina foliolar, podem ser utilizadas na caracterização dos genótipos de amendoim. A menor espessura dos folíolos e a presença de espaços aeríferos na epiderme da face abaxial do limbo foliolar podem ser correlacionadas à suscetibilidade a determinadas moléstias fúngicas foliares do 'Tatu'.

Acoustical Materials and Acoustical Treatments for Aircraft

Soundproofing treatments for aircraft must be designed to provide high degrees of both attenuation of sound transmitted through the fuselage and absorption of sound within the cabin. At low frequencies, treatments of weights which are practical for aircraft provide little or no attenuation of transmitted sound, hence the sound absorption at low frequencies should be made as high as possible by spacing the treatment one to three inches from the dural. At intermediate and high frequencies, the sound absorption is approximately the same for most treatments which have a blanket of acoustical material at least one-half inch thick on the side toward the interior of the cabin, and a highly porous trim cloth. If the trim cloth is not porous, the absorptive properties of the structure will be poor at low frequencies, which must be compensated for by sufficient absorption in the seat upholstering, carpets, etc. The flow resistance of the acoustical material used in the treatment should not be greater than about 500 g cm−2 sec.−1 per inch of thickness. Attenuation of sound by impervious panels, such as windows, dural, etc., at the intermediate and high frequencies is almost entirely dependent upon the surface (SS) density of the panels. The attenuation by an acoustically-treated fuselage structure is at least as great as would be predicted from its surface density. The presence of air spaces, absorptive materials, and impervious septa in the treatment will tend to give greater attenuation than predicted by “weight law.” The relative “efficiency” of a treatment may therefore be characterized by a Merit Factor, which is the ratio of “db better than weight-law” attenuation (at 5000 c.p.s.) to the surface density of the treatment. For both attenuation and absorption, the most effective of the simple treatments designed at this laboratory consists of two blankets of acoustical material with an impervious septum between, the treatment being mounted with an air space of one to three inches between it and the dural, and covered with a highly porous trim cloth. The choice of an acoustical material depends upon many mechanical and economic factors in addition to the acoustical requirements. Materials should be chosen on the basis of complete data on their acoustical transmission (attenuation) and absorption characteristics measured by the standard laboratory techniques referred to in this paper. A rapid estimate of the relative effectiveness of various materials in a given treatment may be obtained by measurement of the flow-resistance of samples of equal surface density, at several thicknesses (obtained by compressing the samples). From a plot of flow-resistance R vs. thickness T, the value of RTx for each material may be found. The material with the highest value of RTx will generally provide the highest attenuation in a given treatment. The validity of the laboratory measurements of acoustic attenuation and absorption discussed in this paper has been established by many measurements in airplanes of various types, in flight, with a wide variety of acoustical treatments.