Photovoltaic technology has become a huge industry, based on the enormous applications for solar cells. In the 19th century, when photoelectric experiences started to be conducted, it would be ...unexpected that these optoelectronic devices would act as an essential energy source, fighting the ecological footprint brought by non-renewable sources, since the industrial revolution. Renewable energy, where photovoltaic technology has an important role, is present in 3 out of 17 United Nations 2030 goals. However, this path cannot be taken without industry and research innovation. This article aims to review and summarise all the meaningful milestones from photovoltaics history. Additionally, an extended review of the advantages and disadvantages among different technologies is done. Photovoltaics fundamentals are also presented from the photoelectric effect on a p-n junction to the electrical performance characterisation and modelling. Cells’ performance under unusual conditions are summarised, such as due to temperature variation or shading. Finally, some applications are presented and some project feasibility indicators are analysed. Thus, the review presented in this article aims to clarify to readers noteworthy milestones in photovoltaics history, summarise its fundamentals and remarkable applications to catch the attention of new researchers for this interesting field.
Three captivating volumes reveal how Einstein viewed both the physical universe and the everyday world in which he lived. A century after his theory of general relativity shook the foundations of the ...scientific world, Albert Einstein's name is still synonymous with genius. This collection is an introduction to one of the world's greatest minds. Essays in Humanism Nuclear proliferation, Zionism, and the global economy are just a few of the insightful and surprisingly prescient topics scientist Albert Einstein discusses in this volume of collected essays from between 1931 and 1950. With a clear voice and a thoughtful perspective on the effects of science, economics, and politics in daily life, Einstein's essays provide an intriguing view inside the mind of a genius as he addresses the philosophical challenges presented during the turbulence of the Great Depression, World War II, and the dawn of the Cold War. The Theory of Relativity and Other Essays E=mc2 may be Einstein's most well-known contribution to modern science. Now, on the one-hundredth anniversary of the theory of general relativity, discover the thought process behind this famous equation. In this collection of his seven most important essays on physics, Einstein guides his reader through the many layers of scientific theory that formed a starting point for his discoveries. By both supporting and refuting the theories and scientific efforts of his predecessors, he reveals the origins and meaning of such significant topics as physics and reality, the fundamentals of theoretical physics, the common language of science, the laws of science and of ethics, and an elementary derivation of the equivalence of mass and energy. This remarkable collection, authorized by the Albert Einstein archives, allows the non-scientist to understand not only the significance of Einstein's masterpiece, but also the brilliant mind behind it. The World As I See It Authorized by the Albert Einstein Archives, this is a fascinating collection of observations about life, religion, nationalism, and a host of personal topics that engaged the intellect of one of the world's greatest minds. In the aftermath of World War I, Einstein writes about his hopes for the League of Nations, his feelings as a German citizen about the growing anti-Semitism and nationalism of his country, and his opinions about the current affairs of his day. In addition to these political perspectives, The World As I See It reveals the idealistic, spiritual, and witty side of this great intellectual as he approaches topics including "Good and Evil, " "Religion and Science, " "Active Pacifism, " "Christianity and Judaism, " and "Minorities." Including letters, speeches, articles and essays written before 1935, this collection offers a complete portrait of Einstein as a humanitarian and as a human being trying to make sense of the changing world around him. This authorized ebook features new introductions by Neil Berger and an illustrated biography of Albert Einstein, which includes rare photos and never-before-seen documents from the Albert Einstein Archives at the Hebrew University of Jerusalem.
China and Albert Einstein is the first extensive study in English or Chinese of China's reception of the celebrated physicist and his theory of relativity. Tracing the influence of Jesuit ...missionaries in the seventeenth century and Western missionaries and educators in the nineteenth and twentieth centuries, as they introduced key concepts of Western physical science and paved the way for Einstein's radical new ideas, Danian Hu shows us that Chinese receptivity was fostered by the trickle of Chinese students sent abroad for study beginning in the mid-nineteenth century and by the openness of the May Fourth Movement (1916–1923).In a series of biographical studies of Chinese physicists, Hu describes the Chinese assimilation of relativity and explains how Chinese physicists offered arguments and theories of their own. Hu's account concludes with the troubling story of the fate of foreign ideas such as Einstein's in the Chinese Cultural Revolution (1966–1976), when the theory of relativity was denigrated along with Einstein's ideas on democracy and world peace. China and Albert Einstein is an important contribution to Einstein studies and a landmark work in the history of Chinese science.
Respiratory tract diseases are the major cause of morbidity and mortality in children under the age of 5 years, constituting the highest rate of hospitalization in this age group.
To determine the ...prevalence of hospitalizations for respiratory diseases in childhood in the last 5 years and to assess the impact of social isolation due to COVID-19 on the seasonal behavior of these diseases.
A cross-sectional clinical study was carried out, with a survey of all patients aged 0 to 17 years who were admitted with a diagnosis of respiratory diseases between January 2015 and July 2020. The database was delivered to the researchers anonymized. The variables used for analysis were date of admission, date of discharge, length of stay, age, sex and diagnosis. In order to make the analysis possible, the diagnoses were grouped into upper respiratory infection (URI), asthma / bronchitis, bronchiolitis and pneumonia.
2236 admissions were included in the study. Children under 5 years old account for 81% of hospitalizations for respiratory disease in our population. In the adjusted model, an average reduction of 38 hospitalizations was observed in the period of social isolation (coefficient: -37.66; 95% CI (- 68.17; -7.15); p = 0.016).
The social isolation measures adopted during the COVID-19 pandemic dramatically interfered with the seasonality of childhood respiratory diseases. This was reflected in the unexpected reduction in the number of hospitalizations in the pediatric population during this period.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
To determine risk factors for the development of long coronavirus disease 2019 (COVID-19) in healthcare personnel (HCP).
We conducted a case-control study among HCP who had confirmed symptomatic ...COVID-19 working in a Brazilian healthcare system between March 1, 2020, and July 15, 2022. Cases were defined as those having long COVID according to the Centers for Disease Control and Prevention definition. Controls were defined as HCP who had documented COVID-19 but did not develop long COVID. Multiple logistic regression was used to assess the association between exposure variables and long COVID during 180 days of follow-up.
Of 7,051 HCP diagnosed with COVID-19, 1,933 (27.4%) who developed long COVID were compared to 5,118 (72.6%) who did not. The majority of those with long COVID (51.8%) had 3 or more symptoms. Factors associated with the development of long COVID were female sex (OR, 1.21; 95% CI, 1.05-1.39), age (OR, 1.01; 95% CI, 1.00-1.02), and 2 or more SARS-CoV-2 infections (OR, 1.27; 95% CI, 1.07-1.50). Those infected with the SARS-CoV-2 δ (delta) variant (OR, 0.30; 95% CI, 0.17-0.50) or the SARS-CoV-2 o (omicron) variant (OR, 0.49; 95% CI, 0.30-0.78), and those receiving 4 COVID-19 vaccine doses prior to infection (OR, 0.05; 95% CI, 0.01-0.19) were significantly less likely to develop long COVID.
Long COVID can be prevalent among HCP. Acquiring >1 SARS-CoV-2 infection was a major risk factor for long COVID, while maintenance of immunity via vaccination was highly protective.
Albert Einstein remains the quintessential icon of modern genius. Like Newton and many others, his seminal work in physics includes the General Theory of Relativity, the Absolute Nature of Light, and ...perhaps the most famous equation of all time: E=mc2. Following his death in 1955, Einstein's brain was removed and preserved, but has never been fully or systematically studied. In fact, the sections are not even all in one place, and some are mysteriously unaccounted for! In this compelling tale, Frederick E. Lepore delves into the strange, elusive afterlife of Einstein's brain, the controversy surrounding its use, and what its study represents for brain and/or intelligence studies. Carefully reacting to the skepticism of 21st century neuroscience, Lepore more broadly examines the philosophical, medical, and scientific implications of brain-examination. Is the brain simply a computer? If so, how close are we to artificially creating a human brain? Could scientists create a second Einstein? This "biography of a brain" attempts to answer these questions, exploring what made Einstein's brain anatomy exceptional, and how "found" photographs--discovered more than a half a century after his death--may begin to uncover the nature of genius.
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