Assessment of critical conditions for flame spread of live Eucalyptus Saligna leaves litter

2021 ◽  
Author(s):  
Mohamad Lutfi Ramadhan ◽  
Jeronimo Carrascal ◽  
Andres Osorio ◽  
Juan P. Hidalgo
Keyword(s):  
Flame Spread ◽  
Critical Conditions ◽  
Eucalyptus Saligna

Basic Polymer Material Properties for Flame Spread

1993 ◽  
Vol 11 (4) ◽  
pp. 287-295 ◽  
Author(s):  
M.A. Delichatsios
Keyword(s):  
Flame Spread ◽  
Material Properties ◽  
Oxygen Index ◽  
Fire Hazard ◽  
Fire Spread ◽  
Test Methods ◽  
Critical Conditions ◽  
Small Scale ◽  
Limited Oxygen Index ◽  
Limited Oxygen

We present and demonstrate the application of a systematic methodology for predicting fire spread and growth and for a relative fire hazard classification of materials for any scale and fire environment. This methodol ogy consists of three steps: (1) select laboratory test methods to perform flam mability measurements; (2) based on these measurements, obtain key flamma bility material properties which are precisely defined in this work; and (3) use these properties in a mathematical model of fire spread and growth to predict fire hazards. The complementary test methods we have selected and used are: (a) a general flammability test apparatus (such as NIST or FMRC) [1,2] modified to also provide pyrolysis measurements in an inert N2 atmosphere; (b) the Limited Oxygen Index (LOI) apparatus, which is used here as a tool for ob taining properties needed for creeping flame spread and extinction, including vitiated environments; and (c) a solid material smoke-point height apparatus [8], which is used to characterize the smokiness of the burning material needed to determine the radiation and smoke yield for arbitrary fire situations (wall fires, pool fires or ceiling fires) [8]. The use and proper interpretation of the Limited Oxygen Index apparatus can replace the LIFT [10] apparatus for deter mining in a more accurate and direct way the material properties required for creeping (vertical downward, lateral, horizontal) flame spread. The present methodology has been compared well with experiments in this work and else where [9], and it has been used to predict critical conditions for fire spread [11], not empirically as it is usually done, but based on first principles of fire spread, fire growth and burning, together with material flammability properties syste matically deduced from small-scale test measurements.

scholarly journals Flame Spread On Charring Materials: Numerical Predictions And Critical Conditions

1994 ◽  
Vol 4 ◽  
pp. 457-468 ◽  
Author(s):  
M. Delichatsios ◽  
Y. Chen
Keyword(s):  
Flame Spread ◽  
Critical Conditions ◽  
Numerical Predictions

Critical Conditions for Upward Flame Spread and Comparison with Empirical Flammability Indices

1995 ◽  
Vol 106 (1-3) ◽  
pp. 125-136 ◽  
Author(s):  
M. A. DELICHATSIOS
Keyword(s):  
Flame Spread ◽  
Critical Conditions ◽  
Upward Flame Spread

scholarly journals Upward Flame Spread And Critical Conditions For Pe/pvc Cables In A Tray Configuration

1994 ◽  
Vol 4 ◽  
pp. 433-444 ◽  
Author(s):  
M. Delichatsios ◽  
M. Delichatsios
Keyword(s):  
Flame Spread ◽  
Critical Conditions ◽  
Upward Flame Spread

Preservation of Morphological Integrity and Clot Retraction Activity of Human Platelets After Freezing

1964 ◽  
Vol 11 (01) ◽  
pp. 222-229 ◽  
Author(s):  
Isaac Djerassi ◽  
Albert Roy ◽  
Jorge Alvarado ◽  
Keyword(s):  
Dimethyl Sulfoxide ◽  
Liquid Nitrogen ◽  
Human Platelets ◽  
Slow Freezing ◽  
Critical Conditions ◽  
Plasma Medium ◽  
Clot Retraction ◽  
Controlled Freezing ◽  
Direct Immersion

SummaryHuman platelets frozen at −195° C (liquid nitrogen) retain their morphological integrity and ability to promote clot retraction when 5% dimethyl-sulfoxide and 5% dextrose are added to the suspending plasma medium. Slow freezing was more effective than direct immersion in the liquid nitrogen. Although similar results may be achieved with dimethylsulfoxide alone with rigidly controlled freezing rates, the addition of sugars may permit freezing under less critical conditions.Dimethylsulfoxyd und 5% Dextrose dem Plasmamilieu hinzugefügt werden. Das langsame Einfrieren ist effektiver als das direkte Eintauchen in flüssigen Stickstoff. Obschon ähnliche Resultate mit Dimethylsulfoxyd allein unter exakter Kontrolle der Einfrierungsgeschwindig-keit erreicht werden können, erlaubt die Zugabe von Dextrose ein Einfrieren unter weniger kritischen Bedingungen.

Application of graphical analysis of taxonomical structure of diatom complexes in identification of critical conditions of the Neopleistocene lakes (on the example of Bibirevo section)

2019 ◽  
pp. 78-87
Author(s):  
Elena V. Bespalova
Keyword(s):  
Lake Sediments ◽  
Critical Points ◽  
Graphical Analysis ◽  
Volga Region ◽  
Critical Conditions ◽  
Ancient Lake ◽  
Diatom Complexes

Ancient lake sediments of Bibirevo section in the Yaroslavl and Kostroma Volga region are studied by means of graphical analysis of taxonomical structure of diatom complexes. This method allowed to record critical points (change of areas of stability) in the development of a Neopleistocene lake during the transition from stage to stage, as well as from phase to phase.

WIDTH EFFECT ON A VERTICAL RPU FLAME SPREAD WITH A MIDDLE LINEAR IGNITION

2015 ◽  
Vol 46 (7) ◽  
pp. 673-687 ◽  
Author(s):  
Hengze Zhao ◽  
Yongming Zhang ◽  
Yuanming Wang ◽  
Lanming Zhao
Keyword(s):  
Flame Spread ◽  
Width Effect

The role of aromatic microbial metabolites

2018 ◽  
pp. 97-108
Author(s):  
Н.В. Белобородова ◽  
В.В. Мороз ◽  
А.Ю. Бедова
Keyword(s):  
Process Integration ◽  
Biological Effects ◽  
Clinical Findings ◽  
Multiple Organ ◽  
Critical Conditions ◽  
Clear Understanding ◽  
Microbial Metabolites ◽  
Blood Concentrations

Интеграция метаболизма макроорганизма и его микробиоты, обеспечивающая в норме симбиоз и саногенез, нарушается при заболеваниях, травме, критическом состоянии, и вектор взаимодействия может изменяться в пользу прокариотов по принципу «метаболиты бактерий - против хозяина». Анализ литературы показал, что, с одной стороны, имеется живой интерес к ароматическим микробным метаболитам, с другой - отсутствует четкое представление об их роли в организме человека. Публикации, касающиеся ряда ароматических микробных метаболитов (фенилкарбоновых кислот, ФКК), как правило, не связаны между собой по тематике и направлены на решение тех или иных прикладных задач в разных областях биологии и медицины. Цель обзора - анализ информации о происхождении, биологических эффектах ФКК в экспериментах in vitro и in vivo , и клинических наблюдениях. Обобщая результаты приведенных в обзоре исследований на клеточном, субклеточном и молекулярном уровнях, логично предположить участие ароматических микробных метаболитов в патогенезе полиорганной недостаточности при сепсисе. Наиболее перспективным для раскрытия роли ароматических микробных метаболитов представляется изучение механизмов вторичной почечной недостаточности и септической энцефалопатии. Важным направлением для будущих исследований является изучение влияния продуктов микробной биодеградации ароматических соединений на развитие диссеминированного внутрисосудистого свертывания крови, артериальной гипотензии и септического шока. Результаты дальнейших исследований будут иметь не только фундаментальное значение, но и обогатят практическую медицину новыми диагностическими и лечебными технологиями. Significant increases in blood concentrations of some aromatic metabolites (phenylcarboxylic acids, PhCAs) in patients with sepsis have been previously shown. Enhanced bacterial biodegradation of aromatic compounds has been demonstrated to considerably contribute to this process. Integration of macroorganism metabolism and its microbiota, which provides normal symbiosis and sanogenesis, is disturbed in diseases, trauma, and critical conditions. Direction of this interaction may change in favor of prokaryotes according to the principle, “bacterial metabolites are against the host”. Analysis of literature showed a particular interest of many investigators to aromatic microbial metabolites. However, there is no clear understanding of their role in the human body. Publications on PhCAs are generally not thematically interrelated and usually focus on solving applied tasks in different fields of biology and medicine. The aim of this work was to consolidate existing information about origin and biological effects of PhCAs in in vitro / in vivo experiments and some clinical findings. The presented summary of reported data from studies performed at cellular, sub-cellular, and molecular levels suggests participation of aromatic microbial metabolites in the pathogenesis of multiple organ failure in sepsis. Studying mechanisms of secondary renal failure and septic encephalopathy is most promising for discovering the function of aromatic microbial metabolites. Effects of microbial biodegradation products of aromatic substances on development of disseminated intravascular coagulation, hypotension, and septic shock are an important challenge for future studies. Results of further investigations will be not only fundamental, but will also enrich medical practice with new diagnostic and therapeutic technologies.

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