Cuba - Science topic

In this paper

On the analytical approach for modeling photovoltaic systems

behavior by Javier Cubas

I tried to derive the an implicit expression of the series resistor, from the following 4 equations which are ued by author:

I_pv≡(R_sh+R_s)/R_sh I_sc………………………………………………(7)

I_0=((R_sh+R_S ) I_Sc-V_oc)/(R_sh exp⁡(V_oc/(aV_T )) ) …………………………………………(9)

(I_SC-&(I_sc-(V_oc-R_S I_sc)/R_sh )[exp⁡((V_mp+I_mp R_S-V_oc)/(aV_T )) ]@-&(V_mp+I_mp R_S-I_sc R_S)/R_sh =I_mp.) ……………..(11)

dI/dV=-I_0/(aV_T ) (1+dI/dV R_S )[exp⁡((V+IR_S)/(aV_T )) ]-1/R_sh (1+dI/dV R_S ) ……(15)

A pdf file shows the equations summarized which he used to derive series and shunt resistanc explicit equations.

I need to know the derivision from those 4 eqautions to get the R_s and R_sh equations :

(aV_T V_mp (2I_mp-I_SC ))/((V_mp I_SC+V_oc (I_mp-I_SC ))(V_mp-I_mp R_S )-aV_T (V_mp I_SC-V_oc I_mp ) )= exp⁡((V_mp+I_mp R_S-V_oc)/(aV_T )) (2)

R_sh=(V_mp-I_mp R_S )(V_mp-R_S (I_SC-I_mp )-aV_T )/((V_mp-I_mp R_S )(I_SC-I_mp )-aV_T I_mp ) (3)

In the today newspapers we have found the next interesting news:

'A meteor was seen in the sky across the Florida Keys,’ NWS Key' West tweeted Friday afternoon amid mounting questions from locals who saw the smoking object fly overhead. It appears that a meteorite impact occurred in western Cuba, near the town of Viñales, Pinar del Río, earlier this afternoon.’ The impact occurred at around 1:20 p.m. local time.'

Such a way it seems that the accretion theory was hit by this meteorite… Without any important microscopically examination my opinion is that the meteorite fallen to Cuba has a volcanic origin (seems like volcanic breccia) and formed onto pre-existed planet!

First three pictures: meteorite fallen onto Cuba ...

Kind Regards,

Laszlo

Does anyone know if this institution has a contact email or who is in charge of the invertebrates area?

I need information about the collection of arachnids deposited by J. P. Rudloff.

Normally I carry out research related to terrestrial tardigrades, however I would like to start investigating the fauna of marine tardigrades in Cuba, I have carried out some exploratory samplings at different sites using the classic techniques for the study of meiofauna and those described in the literature on marine tardigrades, however I have not been successful. I have been able to observe other groups of organisms belonging to the marine meiofauna but I have not been able to find tardigrades. Are there any other aspects to take into account in addition to the sampling methodology for the study of marine tardigrades, such as the type of habitat or substrate, wave characteristics, specific areas to sample, etc.?

Greetings to all those who study paleohurricanes!!!

I’m studying paleohurricanes in Cuba through sediments from coastal lagoons. Many researches in the field of Paleotempestology have been developed by applying different "proxies'', such as: (1) Grain-size analysis; (2) Loss-on-ignition (Organic Matter analysis); (3) Micropaleontological indicators; I have identified two shells in both corers; (4) Geochemical methods, which in my case has been X-ray fluorescence (XRF) core scanning.

Two questions: 1) What is the most correct methodology to identify old events?; 2) After being identified, how to determine the thickness of the deposits (old events)?

Cordially,

Felipe Matos

I Coloquio virtual de la Asociación de Pedagógos de Cuba, en la Universidad de La Habana.

Remitase al material adjunto para su participación e intercambio.

What are the specific foreign policies of Grenada in international relations?

We are working on the potential map of Rn in the Republic of Cuba and we would like to exchange experiences with other researchers on this topic. At this moment we have an original version and we have used the ten point method proposed by Jens Wiegand of the Wuerzburg University.

Dear Dr. Greetings from Cuba. We develop a project to obtain a formulations of EPN (Cuba strain), did you have possibilities to received young lady fellow? I am agronomic engineer but I have in my team a young lady with a bachelor in Pharmacy but we need help in formulation. Thanks in advanced.

Dr. Mayra G. Rodriguez

I´m working at the Natural History Museum of Santiago de Cuba and I´m looking for the best fee collection management software for both zoological and botanical collections. We want no just have our collection properly organize but also make it visible through the world. I´ve been hearing about Specify, Symbiota and Biota and I´m not sure which one is the most efficient or if there is any other who can be better.

We are collaborating in the preparation of the 1:50 000 geological map of the Republic of Cuba and we would be interested in suggestions on how to use satellite images in this task. Which would be the most appropriate and why?

I am not a botanist or familiar with the botanical Code ( https://www.iapt-taxon.org/nomen/pages/intro/dates.html), but would like to establish which is the correct spelling of this species of oak found in western Cuba. The OD clearly spells it sagraeana ( https://archive.org/details/cihm_40072/page/n61/mode/2up), but modern Cuban authorities appear to spell it sagrana, while a brief internet search seems to throw up virtually equal numbers of both spellings (wikipedia, for example, spells it sagraeana). Any reason in the botanical Code why the original spelling has been abandoned in favour of sagrana. Thank you!

Because I work in The National Aquarium of Cuba

Dear all

Climate change is nowadays a reality that is affecting insular destinations like Cuba or Dominican Republic. Do you consider that due to its impact All-inclusive model is going to disappear from these destinations?

Thanks in advance

I have a formulation of PCR that is:

5 μL of 10x reaction buffer, 5 μL 25mM MgCl2, 100 μM of each deoxynucleoside triphosphate (Promega), 93.7 pMol of the TEM-1 primer, 159.4 pMol of the TEM-2 primer, 0.3 μL of 3 U of Taq polymerase (CIGB, Cuba) and 4 μL of the AND sample, all in a total volume of 50ul.

I have no idea of the volume of the primers that I have to add to the mix, Is it specified or not?

Thanks for your comments.

I need literature that talks about the behavior of this animal, its reproduction rate, mortality, resilience, all aspects of its ecology, and also where they are detected if possible with their coordinates. Preferably for Cuba, but also they serve me articles elsewhere Thank you

A very interesting new way to focus Multiple Sclerosis treatment: repairing myelina. I was informed by a Cuban article (Cuba is having one the highest rates of multiple sclerosis in population in Caribbean islands).

and it was discovered by chance, with a molecule destined originally to fight cholesterol.

I´m working at the Natural History Museum of Santiago de Cuba and I´m looking for the best fee collection management software for both zoological and botanical collections. We want no just have our collection properly organize but also make it visible through the world. I´ve been hearing about Specify, Symbiota and Biota and I´m not sure which one is the most efficient or if there is any other who can be better.

Guatemalan migration to the North and internal population displacements within this country have generated substantial scholarship. However, other dynamics have been less studied. The goal of this discussion is to share ideas and references about South-South migration to Guatemala. Resources about the trans-migration expérience of Hondurans, Salvadorans and Nicaraguayans would be most welcome, especially about experiences that turn into more permanent situations as migrants get turned back at the Mexican border and settle in Guatemala. Other topics could include the dynamics of caravan migration in Central America, as well as Colombian, Cuban, and African migration through (or eventually in) Guatemala.

I'm specifically interested in marine environmental cooperation.

I am trying to find the original source of a report that captive Dasyprocta prymnolopha have an infant mortality of 28.93 %, with 19.5 % of deaths resulting from infanticide, with some cases of linked to subsequent cannibalism. I found this report in the book

"M. Fowler & Z. S. Cubas (eds.) (pp 226). Biology, Medicine and Surgery of South American Wild Animals. Iowa, USA: Iowa State University Press" but there was no citation and I can't find the original source anywhere.

Can anyone help?

Thank you,

Rebecca Smith

I am trying to develop a study abroad class in Havana, Cuba, for my undergraduate Exercise Science & Wellness students. I think it would be a great way to expose them to a very different way of assessing and training athletes, general population and people with chronic disease. Does anybody know who might be willing to host a 2-week long course of about 8-12 students?

I work in the updating and improvement of the technical controls to earth dams in Cuba, integrating the results that are measured regularly in this process. I want to integrate these results under a single system.

Hello,

So I meet a case of a person that in Europe has gluten sensitivity but never got positive in the celiac tests. When travelling outside Europe (Asia, Africa, Cuba) can eat breat and other gluten containing foods with no bowel irritation nor celiac sintomes.

I was wondering if any in the community may know the reason. Maybe the reason instead of gluten is more related with the postprocessing done in Europe, or the wheat strains employed in Europe?

Hope you have any ideas. Thank you,

Nico Ortiz

Special issue on Mineral Deposits of Latin America and the Caribbean (Boletín de la Sociedad Geológica Mexicana)

Heads up! We are intending to publish a special issue on Mineral Deposits of Latin America and the Caribbean in the Boletín de la Sociedad Geológica Mexicana (BSGM, http://boletinsgm.igeolcu.unam.mx/bsgm/). The BSGM is a completely free access semi-annual journal, the oldest strictly peer-reviewed journal on Earth Sciences in Mexico and one of the oldest in Latin America, and is included in the Web of Science, Journal Citation Reports, SciELO, Scopus, and in many other instruments. We do not aim to restrict our scope to any type of deposits or type of studies, and all contributions related to the formation of mineral deposits in Latin America, the Caribbean or conterminous regions are most welcome, from the regional to the mineral-association scales of observation and analysis. Both original research papers and original thematic reviews are welcome as either full-length papers or short notes. Both Industry and Academia authors are encouraged to submit their contributions. Contributions focused on mineral deposits from Mexico, Cuba, Peru, Bolivia, Colombia, Venezuela and the Dominican Rep. are so far lined up! The guest editors to this special issue are · Joaquín A. Proenza (Universitat de Barcelona), · Lisard Torró (Pontificia Universidad Católica del Perú), and · Carl E. Nelson (Recursos del Caribe S.A.). All inquiries associated with this special issue or the journal itself are be addressed to the Editor-in-Chief of the BSGM (Antoni Camprubí, camprubitaga@gmail.com). Contributions can be written in either English or Spanish, and must adhere to our instructions to authors (http://boletinsgm.igeolcu.unam.mx/bsgm/index.php/instrucciones-instructions). We apply no restrictions with regard to number of pages, number of figures or tables (other than those determined by our valued scientific reviewers), and we do not charge for coloured figures of for any other matter. First, we need to have a precise idea of how many contributions can be effectively expected for this call for papers; therefore, we need the interested contributors to kindly provide a tentative title, a list of authors (with their institution names and contact emails), and a 300-word synopsis of their intended contributions. Important dates: · November 3, 2018: deadline for submittal of tentative title, author list and synopsis. · May 31, 2019: deadline for submittal of original manuscripts · August 31, 2019: deadline for all revisions by peers of submitted manuscripts. · October 31, 2019: deadline for submittal of revised manuscripts. · April 30, 2020: deadline for online publication of all accepted contributions. The dates above are only tentative and may be corrected depending on the amount of contributions to this issue. Any changes in schedule will be notified to all contributors as soon as necessary. Do not hesitate to forward this message to any colleagues you may consider to have a potential interest in this special issue. We will surely be most grateful to you for your help in disseminating this information.

I was wondering if beyond Cuba, there are other Caribbean Islands are researching about education/educational sciences.

I work at the university of Camaguey, Cuba, Department of History

I am leader of a project in Cuba aimed at the improvement of crops productivity under drought stress through combined inoculation and any information about bacterial metabolism under such type of stress shall be welcome.

The pictures were taken between December 2017 / January 2018 (winter).

I need urgently this reference please.

Beckmann, JP and Beckmann, R. (1966) Calcareous algae from the Cretaceous and Tertiary of Cuba

Thanks

Necesito urgente quien me puede ayudar a conseguir esta bibliografia

Beckmann, JP and Beckmann, R. (1966) Calcareous algae from the Cretaceous and Tertiary of Cuba

Gracias

We are working to use ozono in RAS for marine fish hatchery in Cuba. 

We have problems to use the tecnologies in distance education and, in 2016 Cuba made anohter reference model for distance education based on ICT, but teachers and students do not know how to use it. Can we share our research with your center to make better relations?

This fossil Himenofitales fern was collected several years ago by R. Rojas and myself from a Jurassic pre mid-Oxfordian exposure of the San Cayetano Formation in western Cuba. Any suggestion as to species or genera or distribution in time and space?

Now might be a great time to start the baseline of a longitudinal study of NCDs, especially cardiovascular disease, in Cuba before foreign direct investment by companies such as McDonald's, Yum Brands, etc. takes over the island. It would be interesting to see if, as incomes rise and people have more disposable income, whether they eat fast food, whether their BMI increases and if this causes higher cardiovascular morbidity and mortality. We have anecdotal evidence from East Asia following the 1997 currency crisis, where because the value of the bhat and other currencies fell relative to the dollar, people could not afford to eat fast food as much as they had been. People reported that they didn't eat fast food as much and felt better after moving back to a more traditional diet but there is no quantitative evidence of the effects on the incidence of cardiovascular disease.

Just a thought.

Gender Telenomus has been little studied in Cuba, so there is little information on taxonomic keys for the identification of different species of these parasitoids.

This plant has been located in SW Spain. It´s ornamental, we have no idea what it is. It is a shrub, with trifoliate leaves are opposite, fruit capsule, bifid stigma and 4 stamens to the corolla. Possibly originating in Cuba. In Andalusia is the vernacular name of "Vence battles" (Vence batallas) making allusion to its curative properties