Why Do Birds False Alarm Flight?

False alarm flighting in avian flocks is common, and has been explained as a maladaptive information cascade. If false alarm flighting is maladaptive per se, then its frequency can only be explained by it being net adaptive in relation to some other benefit or equilibrium. However, I argue that natural selection cannot distinguish between false and true alarm flights that have similar energetic costs, opportunity costs, and outcomes. False alarm flighting cannot be maladaptive if natural selection cannot perceive the difference between true and false alarm flighting. Rather, the question to answer is what false and true alarm flighting both have in common that is adaptive per se. The fire drill hypothesis of alarm flighting posits that false alarm flights are an adaptive investment in practicing escape. The fire drill hypothesis predicts that all individuals can benefit from practicing escape, particularly juveniles. Flighting practice could improve recognition of and response time to alarm flighting signals, could compensate for inter-individual and within-day weight differences, and could aid the development of adaptive escape tactics. Mixed-age flocks with many juveniles are expected to false alarm flight more than adult flocks. Flocks that inhabit complex terrain should gain less from escape practice and should false alarm flight less. Behavioural ecology framings can be fruitfully complemented by other research traditions of learning and behaviour that are more focused on maturation and motor learning processes.

Effects of various artificial agarwood-induction techniques on the metabolome of Aquilaria sinensis

Background Agarwood is a highly sought-after resinous wood for uses in medicine, incense, and perfume production. To overcome challenges associated with agarwood production in Aquilaria sinensis, several artificial agarwood-induction treatments have been developed. However, the effects of these techniques on the metabolome of the treated wood samples are unknown. Therefore, the present study was conducted to evaluate the effects of four treatments: fire drill treatment (F), fire drill + brine treatment (FS), cold drill treatment (D) and cold drill + brine treatment (DS)) on ethanol-extracted oil content and metabolome profiles of treated wood samples from A. sinensis. Results The ethanol-extracted oil content obtained from the four treatments differed significantly (F < D < DS < FS). A total of 712 metabolites composed mostly of alkaloids, amino acids and derivatives, flavonoids, lipids, phenolic acids, organic acids, nucleotides and derivatives, and terpenoids were detected. In pairwise comparisons, 302, 155, 271 and 363 differentially accumulated metabolites (DAM) were detected in F_vs_FS, D_vs_DS, F_vs_D and FS_vs_DS, respectively. The DAMs were enriched in flavonoid/flavone and flavonol biosynthesis, sesquiterpenoid and triterpenoid biosynthesis. Generally, addition of brine to either fire or cold drill treatments reduced the abundance of most of the metabolites. Conclusion The results from this study offer valuable insights into synthetically-induced agarwood production in A. sinensis.

Crowd Emergency Evacuation Simulation Time Analysis via Obstacle Optimization Strategy

The crowd evacuation simulation is essential to provide important results for occupants, especially in the large capacity building compared to the human fire drill exercise. The strategy of evacuation such as the use of obstacles may need to be adapted by many organizations as an aid to help in visualizing and estimating the evacuation time during an emergency. During certain crowd events, they may consider the various setting of the object to ensure smoothness and effective crowd evacuation flow. In this paper, it aims to provide the simulation with 100-1000 agents and testing with obstacle using Anylogic tool and analysis of evacuation time validated using SPSS. The results show that the placement of obstacles near the exit way indeed can reduce the evacuation time and complies with the anti-arching phenomenon during evacuation.

Assessment of Loss of Practical Skills by Cadets in Rescue Operations and Methods of Their Recovery

The article deals with the training of cadets in educational institutions of The State Fire Service of EMERCOM of Russia in the field of rescue and fire fighting. For the first time the attention is focused on the problem connected with gradual loss by the final year of professionally-applied skills and physical and psychological qualities which cadets acquire while studying the course "Fire Drill" which forms basic skills of firefighters' work in the first and second years. The purpose of the study was to assess the degree of loss of previously obtained professional and applied skills and development of methods of practical training, allowing to form and maintain throughout the period of training, practical skills, physical and psychological qualities necessary to perform rescue operations and fire fighting. Methods of observation and pedagogical experiment, as well as statistical methods of processing its results were used to solve the research problems. Pedagogical experiment has confirmed the fact of loss of vocational and applied skills by the graduates while performing fire drill regulations which are so necessary for the young officer, the head of the fire rescue guard. To solve the problem of training cadets and reducing the adaptation period of graduates to their professional activity, a new method of practical training is proposed, which allows to form and maintain throughout the training period, practical skills, physical and psychological qualities necessary to perform rescue operations and fire fighting.

Labīd, ʿAbīd, and Lubad: Lexical Excavation and the Reclamation of the Poetic Past in al-Maʿarrī’s Luzūmiyyāt

The blind Syrian poet, man of letters and scholar, Abū al-ʿAlāʾ al-Maʿarrī (363 H/973 CE-449 H/1057 CE) is the author of two celebrated diwans. The second of these, his controversial double-rhymed and alphabetized, Luzūm Mā Lā Yalzam (Requiring What is Not Obligatory), known simply as Al-Luzūmiyyāt (The Compulsories), features his uninhibited, often highly ironic and usually pessimistic, religious, and ‘philosophical’ ideas along with mordant criticism of politics, religion, and humanity in general. In his introduction, he abjures the corrupt and worldly qaṣīdah poetry of his otherwise celebrated early diwan, Saqṭ al-Zand (Sparks of the Fire-Drill), to turn in al-Luzūmiyyāt to a poetry that is “free from lies.” In the present study I take a ‘biopsy’ from Al-Luzūmiyyāt of the eight poems with the double rhyme b-d to explore al-Maʿarrī’s excavation and reclamation of meaning from the Ancient Arabian past through the intertwined legacies of philology and poetic lore. The constraint (luzūm) of the double b-d rhyme in these poems leads inexorably to two proper names, the legends and poetry associated with them, and the etymological-semantic complex that yokes them together and generates related names and themes. The first name is that of the renowned poet of the Muʿallaqāt, Labīd ibn Rabīʿah; the second is that of Lubad, the last of the seven vultures whose life-spans measured out the days of the legendary pre-Islamic sage, Luqmān. Not surprisingly, the ancient Jāhilī poet-knight ʿAbīd ibn al-Abraṣ, likewise, cannot escape the pull of the b-d rhyme. The study demonstrates the mythophoric power of proper names from the Arabic poetic and folkloric past, once lexically and morphologically generated by the double consonants of the rhyme pattern, to evoke poems and legends of the past but also, by the force of al-Maʿarrī’s moral as well as prosodic constraints, to be reconstructed in accordance with the prosodic and moral constraints of Luzūm Mā Lā Yalzam, into a new poetic form, the luzūmiyyah. Quite at odds with the moral, thematic, and structural trajectory of the qaṣīdah form, the luzūmiyyah is by contrast static, directionless, and oftentimes a dead end.

Polysemy and cognitive linguistics. The case of vána

The aim of this paper is to address the problem of the polysemy of Sanskrit words using the example of the meanings of the word vána used in the Ṛgveda (“a tree, wood, forest, fire drill, vessel for Soma, water and material of the world”). I will show that the methodology of cognitive linguistics is very useful to analyse the rational background of polysemy and its conceptual consistency. The basis for my analysis is three assumptions accepted in cognitive linguistics: 1. the meaning of words reflects thinking about the designate; 2. thinking is motivated by experience and cultural beliefs; 3. the associations between semantic aspects of the word can be modelled as conceptual metonymy, conceptual metaphor and conceptual blending. On the basis of these assumptions, I will reconstruct the semantic structure of the word vána. It is a radial category, the centre of which is constituted by its most literal meaning, “tree”, and its metonymic extensions, i.e. wood and forest. The meanings of things made of wood (i.e. fire drill and vessel) are also close to the central meaning and are metonymic extensions. The meanings of water and the material of the world are metaphoric extensions of the central meaning and more peripheral. They are based on cultural beliefs and models shared by the Ṛgvedic poets. I will also argue that the Ṛgvedic poets consciously shaped the semantics of the word vána by using it in contexts which forced the recipient to activate its less literal meanings. Thus they could create a general concept of the hiding place of desirable goods, such as fire, Soma, the sun, and the world.