1,720,998 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Responsible use of chemicals in secondary and primary schools
Full text linkLjudje dnevno uporabljamo kemikalije na delovnem mestu, doma ali v šoli. Število registriranih kemikalij in njihova prisotnost v izdelkih z vsakim dnem narašča. Raba kemikalij za uporabnika in okolje predstavlja določeno tveganje. Pomembno je, da učence že v zgodnjih obdobjih šolanja ozaveščamo o nevarnosti in ustreznem ravnanju z njimi, ter tako preprečimo nezgode. Za čim boljšo izvedbo tega je potrebno raziskati, kako rabo kemikalij dojemajo učenci naših osnovnih in srednjih šol, ter kako so ozaveščeni o varnosti in tveganju na tem področju.
Raziskava je potekala med srednješolci 2. letnika, maturanti ter osnovnošolci 8. in 9. razreda s pomočjo anketnega vprašalnika na temo odgovorne rabe kemikalij. V diplomskem delu je bilo na podlagi odgovorov 132 učencev preučeno, kakšno je njihovo zavedanje o prisotnosti nevarnih snovi v vsakdanjem življenju in varnem ravnanju z njimi ter ali so med učenci srednje in osnovne šole prisotne razlike. Predpostavljala sem, da je splošen odnos do kemikalij med učenci pozitiven, srednješolci pa bolj poznajo kemikalije in tveganje povezano z njimi.
Rezultati raziskave so pokazali, da je splošen odnos do kemikalij med učenci pozitiven. Zavedajo se, da so vsakodnevno obkroženi z njimi in vedo, kako pristopiti k njihovi uporabi. Na odgovorno rabo vpliva tudi njihova starost, saj se znanje srednješolcev na to temo razvija in se z leti vedno bolj zavedajo odgovornega ravnanja. K temu bi lahko pripisali tudi znanje pri delu v laboratoriju. Na podlagi teh ugotovitev sem potrdila postavljene hipoteze.
Za izboljšanje varnostne kulture in učinkovitega zmanjševanja tveganja bi lahko pripravili predavanja za učence in dijake s prikazom praktičnih primerov na to temo in jih izvajali po šolah. Lahko pa bi izvedli usposabljanja za učitelje, kako na ustrezen in zanimiv način vpeljati varnost v kemijske učilnice in pouk. V učne ure bi lahko vključili posnetke na temo varnosti in tako na zanimiv a hkrati poučen način spodbudili učence h kritičnemu mišljenju. Odgovorne rabe kemikalij se ne sme jemati kot zahtevo zakonodaje, temveč kot popotnico za nadaljnje življenje, da bomo kasneje svoje delo opravljali učinkovito, a varno in brez nezaželenih posledic za nas in okolje.Chemicals are nowadays used on a daily basis at work, at home or at school. Both, the number of registered chemicals and their presence in everyday products are growing increasingly. However, their use represents a certain risk to the user and the environment. If we want to prevent possible accidents it is important to raise awarrenes of the appropriate handling of chemicals in the early stages of education. To efficiently reach such a goal, a reserch towards the chemicals perception by the pupil of our primary and secondary schools, and how is their awarness of safety and risk in this area, is proposed.
The research was conducted with the 2nd and the 4th year secondary school pupils and the 8th and the 9th year primary school pupils with a survey based on the responsible use of chemicals. Awareness of the presence of hazardous substances in everyday life and their safe handling, and whether there are differences between high school and primary school students was examined in the diploma thesis based on the 132 surveys. It was assumed that the general attitude towards chemicals handling among students was positive, and high school students were more familiar with chemicals and the risks associated with them.
The results of the research showed that the general attitude towards chemicals among students is positive. They are aware of the chemicals around them on a daily basis and also how to appropriately use them. There is also correlation between their age and their responsible use, as high school students knowledge is developing and they are more aware of responsible use. Knowledge of laboratory work could also be attributed to this. Based on these findings, both hypotheses were confirmed.
To improve safety culture and effectively reduce risk, seminars with practical cases on this issue could be prepared and conducted in schools fort he pupils. Further training could be provided for the teachers on how to implement safety trough chemistry classes and laboratories trough in an appropriate and interesting way. Lectures with the safety topics could be incorporated into the regular curiculum, thus encouraging pupils to evaluate chemicals critically in aninteresting, though educational approach. Responsible use of chemicals should not be taken as an obligatory requirement of the legislation, but as a welcome guide trough an efficient and safe work without undesired health and environmental consequences
Odgovorna raba kemikalij v industriji
Full text linkO kemikalijah in ravnanju z njimi nas izobražujejo že v času šolanja in kasneje na specifičnih delovnih mestih, če se tam zaposlimo. O tem, kakšen odnos in pogled na kemikalije imajo ljudje in ali z njimi odgovorno ravnajo, je na voljo nekaj raziskav, kakšen pa je odnos in pogled na kemikalije ljudi, ki so z njimi v stiku na dnevni ravni, na delovnem mestu, pa ni tako dobro raziskano. Namen diplomskega dela je bilo raziskati, kako odgovorno ter kakšen odnos in pogled na kemikalije imajo zaposleni v kemijski industriji v Sloveniji.
Raziskava o slednjem je potekala med ljudmi v kemijski industriji s pomočjo anketnega vprašalnika, ki sem ga pripravila ob pomoči mentorice doc. dr. Barbare Novosel in doc. dr. Marije Molan. Anketni vprašalnik je sestavljalo 32 vprašanj, od katerih je bilo nekaj splošnih o spolu, starosti in izobrazbi, sledila pa so jim vprašanja, povezana s kemikalijami, kot so ali uporabljajo kemikalije, kako se pred njimi zaščitijo, na kaj so pozorni pri nakupu izdelkov v trgovini, ali poznajo učinke določenih kemikalij in tako dalje. Iz pridobljenih rezultatov vprašalnika je bilo raziskano, kakšni so splošni odgovori, ali je razlika med njimi glede na spol, starost ali izobrazbo anketiranih in ali je možno iz že obstoječih raziskav z laiki razbrati razlike med njimi in zaposlenimi v industriji.
Izkazalo se je, da je splošen odnos ljudi do kemikalij dokaj pozitiven, da se ljudje kemikalij zavedajo in imajo do njih odgovoren odnos. Največji vpliv na odnos in pogled na kemikalije ima spol, malo manj starost, medtem ko ga izobrazba glede na raziskavo vpliva nima. Očitne razlike odnosa in pogleda na kemikalije med laiki in zaposlenimi v industriji prav tako ni bilo. Za izboljšanje že dokaj zadovoljivega znanja o kemikalijah bi se lahko pripravile razne ciljnim skupinam prilagojene zloženke, seminarji ali ozaveščanje preko medijev, kot sta televizija in internet, ki je dandanes že večini dostopen in ga uporablja ogromno ljudi.We are educating ourselves on chemicals and dealing with them in the period of schooling, and later on specific jobs, if we work there. About what kind of attitude and view of chemicals people have and whether they act responsibly, there are some studies available, but what is the relationship and look at the chemicals of people who are in contact with them on a daily basis, is not so good researched. As part of my diploma thesis, I wanted to explore how responsible and what kind of attitude and view of chemicals employees in the chemical industry in Slovenia have.
The research on the latter was conducted among people in the chemical industry with the help of a questionnaire, which I prepared with the help of mentor doc. dr. Barbara Novosel and doc. dr. Marija Molan. The questionnaire consisted of 32 questions, some of which were general on gender, age and education, followed by questions related to chemicals such as, their use of chemicals, how to protect yourself from them, what they are paying attention to when buying products in the shop, do they know effects of certain chemicals and so on. From the obtained results of the questionnaire, it was studied what are the general answers, whether there is a difference between them according to gender, age or education, and whether it is possible to find out if there is the differences between employees in the industry and lay people from the existing research with lay people.
It turned out that the general attitude of people to chemicals is quite positive, that people are aware and have a respectful approach to them. The greatest influence on the attitude and view of the chemicals is played by gender, a little less age, while education has no influence on their attitude. There was also no obvious difference in the relationship and view of chemicals between lay people and employees in the industry. In order to improve the already quite satisfactory knowledge of chemicals, it would be possible to prepare a wide range of custom-made leaflets, various seminars or media information, such as television and the Internet, which is nowadays most accessible and used by a lot of people
Determination of selected metals in surface water by ICP-OES and assessment of their effects on human health
Full text linkV okviru diplomskega dela smo določali vsebnost težkih kovin v površinski vodi potoka
Drtijščice z namenom ocenitve njihovih vplivov na zdravje ljudi. Določali smo arzen
(As), kadmij (Cd), kobalt (Co), krom (Cr), baker (Cu), molibden (Mo), nikelj (Ni), svinec
(Pb), selen (Se) in cink (Zn). Terensko delo - vzorčenje smo opravili februarja 2020,
takrat smo odvzeli šest vzorcev na šestih različnih odvzemnih mestih. Vzorce smo
prefiltrirali in redčili z 1 % dušikovo kislino. Za določevanje kovin v vodi smo uporabili
akreditirano analitsko tehniko induktivno sklopljeno plazemsko atomsko emisijsko
spektroskopijo (ICP-OES), ki nam je, v enem vzorcu, omogočala določevanje več
kovin hkrati. Za pripravo standardnih raztopin smo uporabili multi-standardno raztopino
Merck (VI) KGaA. Dobljene koncentracije smo primerjali z mejnimi in priporočenimi
vrednostmi iz domače in tuje zakonodaje ter drugimi verodostojnimi študijami.
Rezultati so pokazali povišane koncentracije Se in Co, saj je vrednost teh dveh kovin
v vseh šestih vzorcih presegala mejne vrednosti iz slovenske zakonodaje. Prav tako
so bile na večih odvzemnih mestih presežene koncentracije Pb, As, Cd in Cu.
Izmerjene vrednosti Zn in Cr v nobenem vzorcu niso presegale mejnih vrednosti.
Vrednosti Mn, Mo in Ni so bile, v glavnem, pod mejo detekcije, kar pomeni, da je bila
koncentracija teh kovin v vzorcih premajhna, da bi jo aparatura lahko zaznala.
Povišane koncentracije skoraj polovice od preiskovanih težkih kovin v površinski vodi,
nakazujejo na slabo ekološko stanje preiskovanega vodnega telesa, kar lahko vpliva
na zdravje okoliških prebivalcev in vodne organizme.As part of my bachelor\u27s degree, we determined the content of heavy metals in the
surface water of Drtijščica stream in order to assess their impact on human health. In
the water we determined arsenic (As), cadmium (Cd), cobalt (Co), chromium (Cr),
baking (Cu), molybdenum (Mo), nickel (Ni), lead (Pb), selenium (Se) and zinc (Zn).
The submitted work, i.e. sampling, was carried out in the February 2020 when six
samples were taken at six different sampling points. The samples were then filtered
and diluted with 1% nitric acid. For the determination of metals in water, we used the
accredited method of inductively coupled plasma - optical emission spectrometry (ICP-
OES), which enabled us to determine several metals in one sample simultaneously. A
multi-standard solution from Merck (VI) KGaA was used to prepare the standard
solutions. The results of our study were then compared with the maximum permitted
and recommended concentrations from domestic and foreign legislation and other
credible studies.
The results showed an increased concentration of Se and Co, as the value of the two
metals in all six samples exceeded the limits set by Slovenian legislation. The
concentrations of Pb, As, Cd and Cu also exceeded the limit values at most of the
sampling points. The measured values of Zn and Cr did not exceed the limit values in
any sample. The values of Mn, Mo and Ni were mainly below the detection limit, which
means that the concentration of these metals was too low for detection with the ICP-
OES device. Elevated concentrations of almost half of the investigated heavy metals,
indicate a poor ecological status, which can definitely have an effect on human health
and aquatic organisms
Determination of material characteristics and explosion parameters of cellulose and particle board dust
No full textGlavna tema magistrskega dela so prašne eksplozije prahu ivernih plošč in prahu celuloze. Prašna eksplozija je nevarni pojav, ki lahko povzroči hude poškodbe in škodo za ljudi, opremo in okolico. Razumevanje tega fenomena je ključnega pomena za preprečevanje prašnih eksplozij.
V prvem delu je predstavljena teoretična osnova prašnih eksplozij in sicer zgorevanje, pogoji za nastanek prašne eksplozije in glavni dejavniki, ki vplivajo na potek eksplozije, npr. oblika in velikost delcev, vsebnost vlage, kemijska sestava prahu, koncentracija prahu, koncentracija oksidanta ter vrtinčenje. Predstavljeni so tudi eksplozijski parametri, ki opisujejo občutljivost za nastanek eksplozije ter silovitost eksplozije. Opisane so posledice eksplozije v primeru, da do te kljub sprejetim ukrepom vseeno pride ter ukrepi s katerimi lahko nastanek eksplozije preprečimo ali vsaj ublažimo njene posledice.
V sklopu eksperimentalnega dela smo za prah celuloze in prah ivernih plošč izvedli meritve snovnih karakteristik in eksplozijskih parametrov. Pred pričetkom meritev smo s sejalno analizo za vzorec prahu ivernih plošč pridobili posamezne velikostne frakcije. Nato smo izbranim vzorcem določili velikost in porazdelitev velikosti delcev, specifično površino, vsebnost vlage s termično analizo in vsebnost elementov ogljika, vodika in dušika z elementno analizo. Po določitvi snovnih karakteristik smo izvedli še meritve eksplozijski parametrov in sicer minimalne vžigne energije, minimalne eksplozijske koncentracije, maksimalnega eksplozijskega tlaka in maksimalno hitrost porasta tlaka ter izračunali indeks deflagracije.
V zadnjem delu sledi potrditev ali ovržba predpostavljenih hipotez, ki so predstavljene v namenu magistrskega dela ter primerjava meritev s podatki iz literature.The main topic of the master’s thesis is dust explosions of particleboard dust and cellulose dust. A dust explosion is a dangerous phenomenon that can cause serious injuries and damage to people, equipment and the environment. Understanding this phenomenon is critical for preventing dust explosions.
In the first part, the theoretical basis of dust explosions is presented, namely combustion, the conditions for the formation of a dust explosion and the main factors that influence the course of the explosion itself, e.g. particle shape and size, moisture content, chemical composition, dust concentration, oxidant concentration and turbulence. The explosion parameters are also presented, which describe the sensitivity and the intensity of the explosion. The consequences of an explosion if it occurs despite the measures taken are described, as well as the measures that can be taken to prevent the occurrence of an explosion or at least mitigate its consequences.
As part of the experimental work, we carried out measurements of material characteristics and explosion parameters for cellulose dust and particleboard dust. Before starting the measurements, individual fraction sizes were obtained using a sieving analysis for a particleboard dust sample. We then determined the size and size distribution of the selected samples, the specific surface area, the moisture content with thermal analysis and the content of the elements carbon, hydrogen and nitrogen with elemental analysis. After determining the material characteristics, we also carried out measurements of the explosion parameters - minimum ignition energy, minimum explosion concentration, maximum explosion pressure, maximum speed of pressure rise and calculated the deflagration index.
In the last part of the master\u27s thesis, the confirmation or refutation of the assumed hypotheses follows and also the comparison of measurements with data from the literature
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The analysis of explosions and the necessary precautions for the production of aluminum powder
Full text linkMagistrsko delo obravnava stanje na področju prašnih eksplozij v svetu. Na začetku so opisani prvi znanstveni pristopi k tej problematiki z navedbo statističnih podatkov, ki jim sledi opis znanstvenih teorij nastanka eksplozije. Zatem sledi predstavitev teoretičnih in zakonodajnih načinov za preprečitev eksplozije. Prikazana so doslej znana dejstva in različne teorije o vplivih aluminija na okolje in človeško telo. Pojasnjena je nevarnost eksplozije aluminijevih prahov ter podani napotki za varno in zdravo delo v eksplozijsko roženih prostorih.
V eksperimentalnem delu smo določili osnovne karakteristike in lastnosti izbranih treh vzorcev Al prahu (dva prahova in zdrob), ki se proizvajajo. Vzorcem smo določili velikost in porazdelitev velikosti delcev, specifično površino delcev in termične lastnosti s termično analizo (TG/DTA). Obliko delcev vzorcev Al prahu smo določili z vrstično elektronsko mikroskopijo (SEM). Sledila je določitev minimalne vžigne energije MVE in maksimalnega eksplozijskega tlaka (pmax), maksimalne hitrosti rasti tlaka pri eksploziji (Δp/Δt)max ter izračun deflagracijskega indeksa prahu (Kst). Iz rezultatov analiz smo potrdili hipotezo, da so manjši delci eksplozijsko bolj občutljivi in popolneje izgorevajo ter kot taki pomenijo večje tveganje za nastanek prašne eksplozije. Ugotovili smo tudi, da so Al prahu z manjšimi delci dodani dodatki za zmanjšanje občutljivosti. Za konec smo dobljene rezultate primerjali z dostopnimi literaturnimi navedbami in ugotovili, da so odstopanja prevelika za varno uporabo. Zato je zaradi zagotavljanja zadostne varnosti pred načrtovanjem in delom priporočljivo določiti vsaj velikost in porazdelitev velikosti prašnih delcev. Ta podatek nam namreč omogoči, da v večini literature med kopico podatkov najdemo približno ustrezen vzorec. Seveda pa je potrebno za večjo verjetnost še bolje okarakterizirati vzorce in izvesti še več preizkusov, kar smo v našem primeru tudi izvedli.
Vsaka eksplozija poleg takojšnjih vplivov na ljudeh in okolju pusti tudi dolgotrajne posledice, ki jih z današnjim stanjem tehnike in meritvami niti ne opazujemo in reguliramo. Zato velja, da je najboljši način preprečitve negativnih vplivov eksplozije onemogočanje pogojev za njen nastanek.This master\u27s thesis deals with research on dust explosions in the world, with a brief indication of the beginnings of research and statistics, and continues to current known scientific theory of explosions and methods, theoretical and legislative, to avoid these.
Hitherto known facts and theories about the effects of aluminum on the environment and the human body are presented. The risk of explosion of aluminum powder is described. The instructions for safe and healthy work in hazardous places are described as well.
In the experimental part the basic characteristics and the properties of selected samples from regular production are described. Three samples of aluminum (two powders and meal) were chosen for the investigation. Due to business confidentiality the samples were marked with the letters A, B and C. Detailed analyses of the size and particle size distribution as well as the determination of the specific surface area of the particles were made. Then, a thermal analysis was performed. The samples were also examined by scanning electron microscopy (SEM) at various magnifications, in order to define a particle shape. The determinations of the minimum ignition energy MVE, the maximum explosion pressure (pmax), the maximum pressure growth rate at the explosion (Δp/Δt)max and the calculation of the dust deflagration index (Kst) were made. Based on these results we have proven the hypothesis that the smaller particles are more explosive and more combustible, and as such pose a greater risk of dust explosion. We also found out that Al powder with smaller particles contains some additives for reducing sensitivity. The results obtained from my investigations differ from the theoretical values offered by well-known literature data. Due to excessive deviations, these values are therefore not useful for safe work in practice. Therefore, in order to ensure adequate safety before planning and work, it is advisable to determine at least the size and the size distribution of the dust particles. This information enables us to find an approximate pattern in the literature data set. For precise characterization of the samples it is necessary to carry out even more tests, which we did in our case.
In addition to the immediate effects on humans and the environment, each explosion leaves the long-term consequences that we do not even observe and regulate with current state of technology and measurements. Therefore, the best way to prevent the negative effects of the explosion is to disable the conditions for its formatio
Model prediction of uncontrolled release of propane, methane and hydrogen to the environment
No full textV magistrskem delu smo s pomočjo programov ALOHA in Phast modelirali nenadzorovan izpust propana, metana in vodika v okolje. Uporaba programa ALOHA in Phast predstavlja učinkovit pristop pri ocenjevanju posledic morebitnih nezgod in pri predhodnemu prostorskemu načrtovanju kot tudi pri načrtovanju zadostnih varnostnih ukrepov, s katerimi lahko nezgodo ali ponovitev modelirane nezgode v prihodnosti preprečimo. Pri modeliranju nenadzorovanih izpustov propana, metana in vodika smo pri obeh programih uporabili enake vhodne podatke, s katerimi smo zagotovili primerljivost pridobljenih rezultatov. Ključne spremenljivke so predstavljale vrsto nevarne snovi, količino nevarne snovi, energijsko vrednost nevarne snovi in meteorološke podatke za značilno poletni in značilno zimski čas. Izbira ustreznega programa je pogojena s cilji analize, dostopnostjo vhodnih podatkov in potrebnim odzivnim časom.
Ugotovili smo, da program Phast omogoča prikaz rezultatov večih modelnih napovedi hkrati, medtem ko program ALOHA ne omogoča hkratnega prikaza rezultatov za več scenarijev. Pri izhajanju nevarne snovi iz rezervoarja, pri čemer snov ne gori, je horizontalna komponenta plinskih oblakov večja od vertikalne, kar pomeni da so vsi plinski oblaki po obliki bolj horizontalni kot vertikalni glede na površino terena. Vplivna območja (območje vnetljivosti, območje toplotnega sevanja) imajo v primeru modelnih napovedi za propan večji obseg od vplivnih območij modelnih napovedi za metan, vendar nobena od teh vrednosti ne presega doseženih razdalj vplivnih območij za modelne napovedi nenadzorovanega sproščanja vodika. Vplivna območja propana in metana (za modelne napovedi z enako maso in za modelne napovedi z enako energijsko vrednostjo) značilna za poletni čas imajo sicer manjši obseg kot vplivna območja za zimski čas, vendar imajo vplivna območja za vodik večji obseg pri meteoroloških pogojih znaličnih za zimski čas.In the master\u27s thesis, we modeled the uncontrolled release of propane, methane, and hydrogen into the environment using the ALOHA and Phast software programs. The use of ALOHA and Phast represents an effective approach in assessing the consequences of potential accidents, as well as in preliminary spatial planning and the design of adequate safety measures that can prevent accidents or the recurrence of modeled incidents in the future. When modeling the uncontrolled releases of propane, methane and hydrogen, we used the same input data in both programs to ensure the comparability of the obtained results. The key variables included the type of hazardous substance, the quantity of the hazardous substance, the energy value of the hazardous substance, and meteorological data for both typical summer and winter conditions. The choice of an appropriate program depends on the objectives of the analysis, the availability of input data, and the required response time.
We found that Phast allows for the simultaneous display of results from multiple model scenarios, while ALOHA does not support the concurrent presentation of results for several scenarios. In the case of a release of hazardous substances from a reservoir, where the substance does not ignite, the horizontal component of the gas clouds is larger than the vertical component, meaning that all gas clouds are more horizontally than vertically oriented in relation to the terrain surface. The impact zones (flammability zone, thermal radiation zone) for the modeled predictions of propane cover a larger area than those for methane, though neither of these extends beyond the distances reached in the modeled predictions of uncontrolled hydrogen release. The impact zones for propane and methane (based on identical mass and energy value predictions) are smaller for summer conditions than for winter conditions, but the impact zones for hydrogen expand further under the meteorological conditions typical for winter time
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