Items tagged with: Chemistry
ViXra.org is an e-print archive set up as an alternative to the popular arXiv.org service owned by Cornell University. It has been founded by scientists who find they are unable to submit their articles to arXiv.org because of Cornell University's policy of endorsements and moderation designed to filter out e-prints that they consider inappropriate. ViXra.org has no association with arXiv.org or Cornell.
ViXra is an open repository for new scientific articles. It does not endorse e-prints accepted on its website, neither does it review them against criteria such as correctness or author's credentials.
#ViXra #SCIENCE #OPEN SOURCE #FREE #arXiv #CORNELL #PHYSICS #BIOLOGY #Mathematics
#Computational #Biology #Chemistry #Humanities #Academics
Origin of apparent light-enhanced and negative capacitance in perovskite solar ....So-called negative capacitance seems to remain an obscure feature in the analysis of the frequency-dependent impedance of perovskite solar cells. It belongs to one of the puzzling peculiarities arising from the mixed ionic-electronic conductivity of this class of semiconductor. Here we show that apparently high capacitances in general (positive and negative) are not related to any capacitive feature in the sense of a corresponding charge accumulation. Instead, they are a natural consequence of slow transients mainly in forward current of the diode upon ion displacement when changing voltage.
#perovskite #solar #TECHNOLOGY #SCIENCE #PHYSICS #CHEMISTRY #CRYSTALLOGRAPHY CAPACITANCE
Andrea Rossi's 'E-cat' nuclear reactor: a video FAQ....In January 2011 Andrea Rossi demonstrated a device that purported to develop 10 kW of power from a nuclear reaction. This video discusses its credibility, the investigations that have been done on the device, and its future prospects. The nuclear power claim can be tested by measuring total energy over a period of time and comparing it with what would be possible from conventional energy sources. Previous claims of this kind, beginning with that of Fleischmann and Pons in 1989, have been generally doubted, but it is argued that this general doubt owes more to the persuasive power of rhetoric than to the actual facts.
In contrast to the ITER thermonuclear project, where practical application is decades away, reactors of the Rossi type are already in production and, according to NASA Chief Scientist Dennis M. Bushnell, may be capable of "completely changing geo-economics, geo-politics, and solving climate and energy".
(note added May 2013) Things did not work out quite as was expected when we made this video, and a confused situation resulted, rather than a clear resolution one way or the other. What purported to be a 1MW reactor was demonstrated on schedule in November 2011, at which time it was said that a potential buyer was satisfied. The demonstration was not entirely satisfactory, and it then turned out that the buyer was 'a secret military organisation', and as a result no further information came out.
#E-cat #nuclear #reactor #video #FAQ #Fleischmann #Pons #ITERNASA #LENR #PHYSICS #CHEMISTRY #CAMBRIDGE #ROSSI
When to plan that...career plan?
If you stay still, you get left behind. Is planning the next career step the answer to avoid in-job depressing (especially high when the children don't behave? 😀 )
#citc #chemistryinthecity #education #school #teacher #chemistry #neocities #uk #london #citc201903 #career
#Global #climate #geoengineering #meterology #science #technology #chemistry
Physicists proposed fast method for printing nanolasers from rerovskites....An international research team has developed a new method of synthesizing miniature light sources. It is based on a special laser which produces millions of nanolasers from a perovskite film in a few minutes. Such lasers look like small disks, work at room temperature and have an tunable emission wavelength from 550 to 800 nm. The high speed and good reproducibility of this method make it promising for the industrial production of single nanolasers as well as whole chains. The study was published in ACS Nano.
#printing #nanolasers #Perovskites #SCIENCE #TECHNOLOGY #PHYSICS #CHEMISTRY #CRYTALLOGRAPHY #CHEMISTRY
High-efficiency colloidal quantum dot infrared light-emitting diodes via engineering at the supra-nanocrystalline level....
Colloidal quantum dot (CQD) light-emitting diodes (LEDs) deliver a compelling performance in the visible, yet infrared CQD LEDs underperform their visible-emitting counterparts, largely due to their low photoluminescence quantum efficiency. Here we employ a ternary blend of CQD thin film that comprises a binary host matrix that serves to electronically passivate as well as to cater for an efficient and balanced carrier supply to the emitting quantum dot species. In doing so, we report infrared PbS CQD LEDs with an external quantum efficiency of ~7.9% and a power conversion efficiency of ~9.3%, thanks to their very low density of trap states, on the order of 1014 cm−3, and very high photoluminescence quantum efficiency in electrically conductive quantum dot solids of more than 60%. When these blend devices operate as solar cells they deliver an open circuit voltage that approaches their radiative limit thanks to the synergistic effect of the reduced trap-state density and the density of state modification in the nanocomposite.
#High-efficiency #colloidal #quantum dot #infrared #light emitting diodes #led #CQD #TECHNOLOGY Ä#SCIENCE #CRYSTALLOGRAPHY #PHYSICS #CHEMISTRY #ELECTROLUMINESCENCE
Arguments for the rights of nations to control their borders are a huge step in the wrong direction. We need to take a hard look at the disruptive dynamics of inequality. #poverty #wealth #chemistry #politics #security #environment #sustainability
Urban Honeybeez Are Precise Pollution Detectivez
A new study on pollution reveals that proof isn’t in the pudding — it’s in the honey. Research carried out in partnership between the nonprofit Hives for Humanity and the University of British Columbia showed that honey collected from urban beehives can accurately measure how polluted a city is. This means that honey isn’t just a byproduct of bee regurgitation — it’s also a way to closely monitor changes in the environment.
Writing in Nature Sustainability, the study’s authors explain that this study is the first of its kind in North America. They specifically analyzed honey collected from beehives in six Metro Vancouver neighborhoods — testing for levels of lead, zinc, copper, and other elements. The good news for Vancouver was that the chemical composition of this Canadian honey demonstrated that the city is “extremely clean.” But that doesn’t mean that human influence didn’t affect the honey at all — they found that the closer a hive was to the downtown metro, the higher the chance the hive’s honey contained elevated concentrations of lead, which is toxic at high concentrations.
#canada #germany #science #research #biology #chemistry #interessiert
Fluoride Overfeed Incident Needs Health Investigation....
In response to a fluoride overfeed in Sandy City, Utah, where drinking water fluoride reached levels that caused nausea, vomiting and other fluoride poisoning symptoms in residents, the Fluoride Action Network (FAN) has sent a letter to the mayor and other public officials asking for a detailed health investigation. The fluoride incident on February 5-7 reportedly caused levels at homes to reach over 100 mg/L, a level close to what caused a fatality and serious illnesses in a previous overfeed accident in Alaska. A level of 100 mg/L is 25 times greater than the EPA standard and 150 times greater than the normal level for water fluoridation.
FAN points out that government officials downplayed possible health effects. Officials said fluoride does not accumulate in the body and therefore should cause no long-term effects. This is incorrect, as 50% of ingested fluoride is retained and can raise the body-burden for years. The health investigation that followed the Alaska fluoride poisoning incident found elevated fluoride and abnormal clinical blood measures weeks after the exposures had ceased.
The fluoridating chemical released in Sandy, hydrofluorosilicic acid, apparently caused the corrosiveness of the water to increase dramatically, causing leaching of unsafe levels of lead, copper, and other heavy metals from plumbing. A public health official claimed neurotoxic harm from lead only occurs as the last stage of poisoning. Actually, in children, neurotoxicity occurs at levels below where symptoms of lead poisoning appear.
#FLUORIDE #hydrofluorosilicic #acid #TOXIN #USA #UTAH #WATER #SCIENCE #BIOLOGY #CHEMISTRY #SCANDAL #CONSPIRACY #HEALTH #MEDICINE
Si2HSb2 ....Claims 184,000x Power ....Crystalline Si2HSb2....PATENT US5252176.
This invention relates to a novel method of, and means for, directing energy through Si2HSb2 in such a manner that normal energy parameters can be exceeded. The principal object of the invention is to provide the means for more efficient radiant energy power systems to be constructed. For example, this invention can be applied to construct more efficient rocket propulsion systems. Si2HSb2 has a crystalline structure with a regular pattern of electron deficiencies which physicists call "holes" in the lattice. Energy can be radiated at the top of the compound and be accelerated as it passes through to a new higher velocity as it expelled out the bottom of the compound. This is accomplished by applying electrical potentials to the sides of the compound which rectify the "holes" in the lattice. The electrical potentials applied to the sides of the compound can be varied to allow the radiated energy output to be directed in the x,y plane. Thus the compound can be used as an excellent propulsion system. It can also be used to enhance any output of a radiated energy source.
#Si2HSb2 #AMPLIFIER #RADIANT #ENERGY #ELECTRON #SPACE #ENGINE #SCIENCE #TECHNOLOGY #CHEMISTRY #PHYSICS #CRYSTALLOGRAPHY
Creating Snow Storms,The Knollenberg Patent....The engineered cool-downs and artificial snow storms are already in full swing in parts of the US even as the sweltering triple digit heat in the Western US continues to break high temperature records.Most of the population as of yet has no idea that the record cool-downs in a record warm world are anything but natural.Even many anti-geoengineering activists still seem unwilling to connect this important part of the puzzle.The patent below is for the purpose of artificial ice nucleation for weather modification.The climate engineers have been at this for a very long time. This patent is from 1966 but similar patents go all the way back to 1950. The more relevant parts of this patent are highlighted in yellow for easier review.This patent should give pause to those that still doubt the magnitude of what is happening in our skies. The "weather makers" do in fact "own the weather",but their ongoing experiments will decimate Earth's life support systems beyond repair if they are allowed to continue.
#Snow #Storms #Knollenberg #Patent #artificial #geoengineering #activists #CLIMATOLOGY #METEROLOGY #SCIENCE #TECHNOLOGY #CHEMISTRY #PHYSICS #CONSPIRACY #MANIPULATION
Study, revision and social media
How many students have the self-discipline to refrain from the insidious ease of so-called social media, or is prevention the simplist most effective policy?
#citc #chemistryinthecity #education #school #teacher #chemistry #neocities #uk #london #citc201902 #study #revision
Diaspora or disciple?
Apparently it's called "community media". Just like googleplus, is disciple another diaspora imitator? Are any schools using diaspora, hopefully entirely privately between students?
#citc #chemistryinthecity #education #school #teacher #chemistry #neocities #uk #london #citc201902 #diaspora #question #socialmedia #disciplemedia
Lise Meitner – the forgotten woman of nuclear physics who deserved a Nobel Prize....For many years, physicists believed it energetically impossible for atoms as large as uranium (atomic mass = 235 or 238) to be split into two.
That all changed on Feb. 11,1939, with a letter to the editor of Nature – a premier international scientific journal – that described exactly how such a thing could occur and even named it fission. In that letter, physicist Lise Meitner, with the assistance of her young nephew Otto Frisch, provided a physical explanation of how nuclear fission could happen.
It was a massive leap forward in nuclear physics, but today Lise Meitner remains obscure and largely forgotten. She was excluded from the victory celebration because she was a Jewish woman. Her story is a sad one.
#Meitner #FISSION #NUCLEAR #WOMEN #SCIENCE #PHYSICS #TECHNOLOGY #Chemistry #Atom
#Nobel #Neutrons #Subatomic #particles
New approach improving stability and optical properties of perovskite films....Metal halide perovskites are regarded as next generation materials for light emitting devices (LEDs).A recent joint-research co-led by the scientist from City University of Hong Kong (CityU) has developed a new and efficient fabrication approach to produce all-inorganic perovskite films with better optical properties and stability,enabling the development of high colour-purity and low-cost perovskite LEDs with a high operational lifetime.
#perovskite #LED #Metal #halide #CRYSTALLOGRAPHY #CHEMISTRY #OPTICS #INORGANIC #ELECTRONICS #HARDWARE #TECHNOLOGY #SCIENCE
Researchers use snail teeth to improve solar cells and batteries.... An assistant professor at the University of California, Riverside's Bourns College of Engineering is using the teeth of a marine snail found off the coast of California to create less costly and more efficient nanoscale materials to improve solar cells and lithium-ion batteries.
The paper is focused on the gumboot chiton,the largest type of chiton,which can be up to a foot-long.
#snail #teeth #gumboot #chiton #solar #cell #battery #science #technology #physics #biology #chemistry
The ELECTRIC UNIVERSE®.... W. THORNHILL's Website.
Astronomy is stuck in the gas-light era,unable to see that stars are simply electric lights strung along invisible cosmic power lines that are detectable by their magnetic fields and radio noise.
It is now a century since the Norwegian genius Kristian Birkeland proved that the phenomenal ‘northern lights’ or aurora borealis is an earthly connection with the electrical Sun. Later, Hannes Alfvén the Swedish Nobel Prize winning physicist, with a background in electrical engineering and experience of the northern lights, drew the solar circuit. It is no coincidence that Scandinavian scientists led the way in showing that we live in an ELECTRIC UNIVERSE®.
Why have they been ignored? The answer may be found in the inertia of prior beliefs and the failure of our educational institutions. We humans are better storytellers than scientists. We see the universe through the filter of tales we are told in childhood and our education systems reward those who can best repeat them. Dissent is discouraged so that many of the brightest intellects become bored and drop out. The history of science is sanitized to ignore the great controversies of the past, which were generally ‘won’ by a vote instead of reasoned debate. Today NASA does science by press release and investigative journalism is severely inhibited. And narrow experts who never left school do their glossy media ‘show and tell,’ keeping the public in the dark in this ‘dark age’ of science. It is often said, “extraordinary claims require extraordinary proof.” History shows otherwise that entrenched paradigms resist extraordinary disproof.
This website is for the curious, those who are eager to discover some reasonable answers about life, the universe and everything (as far as it is possible today) free of old beliefs that have shackled progress for centuries. It requires a beginner’s mind and a broad forensic approach to knowledge that is not taught in any university. The payoff is the spark that lights up lives.”
#THORNHILL #WEBSITE #HOLOSCIENCE #SCIENCE #ASTROPHYSICS #PHYSICS #COSMOLOGY #PHILOSOPHY #BIOLOGY #CHEMISTRY #GEOLOGY #ELECTRIC UNIVERSE THEORY
On the Operational Aspects of Measuring Nanoparticle Sizes....Nanoparticles are defined as elementary particles with a size between 1 and 100 nm for at least 50% (in number).They can be made from natural materials,or manufactured.Due to their small sizes,novel toxicological issues are raised and thus determining the accurate size of these nanoparticles is a major challenge.
#Nanoparticle #PSA #analysis #size #chemistry #science #technology #Creative Commons #CC
#Geoengineering #Climate #winter #nucleation #conspiracy #science #chemistry #technology
Effect of Different Additives in Diets on Secondary Structure,Thermal and Mechanical Properties of Silkworm Silk....In this study, eight types of materials including nanoparticles (Cu and CaCO3), metallic ions (Ca2+ and Cu2+),and amino acid substances (serine,tyrosine,sericin amino acid,and fibroin amino acid) were used as additives in silkworm diets to obtain in-situ modified silk fiber composites.
#Additives #Diets #Structure #Thermal #Mechanical #Silkworm #Silk #biology #chemistry #science #technology #green materials
Low Temperature Solution-Processable 3D-Patterned Charge Recombination Layer for Organic Tandem Solar Cells....We propose a novel method to pattern the charge recombination layer (CRL) with a low-temperature solution-processable ZnO layer (under 150 °C) for organic solar cell applications.Due to the optimal drying process and thermal annealing condition,ZnO sol-gel particles formed a three-Dimensional (3D) structure without using a high temperature or ramping method.The generated 3D nano-ripple pattern showed a height of around 120 nm,and a valley-to-valley distance of about 500 nm. Based on this newly developed ZnO nano-ripple patterning technique, it was possible to pattern the CRL without damaging the underneath layers in tandem structure. The use of nano-ripple patterned ZnO as the part of CRL, led to the concomitant improvement of the power conversion efficiency (PCE) of about 30%, compared with non-patterned CRL device.
#Low Temperature #Solution-Processable #3D-Patterned #Charge #Recombination #Organic #Tandem #Solar Cells #Zn #Oorganic #chemistry #technology #science
**Anticorrosion Behavior of Zeolite Coatings Obtained by In Situ Crystallization: A Critical Review
Zeolites are crystalline nanoporous aluminosilicates. Thanks to their intrinsically nanoporous structure they are widely used as molecular sieves, for exchanging ions, or, also thanks to the high surface area of these structures, for catalytic applications. Furthermore, thanks to their thermal and chemical stability, in recent years zeolite coatings have been evaluated for application as anti-corrosion coatings. The non-toxicity of this class of coatings makes it possible that they will be an environmentally friendly alternative to conventional chromate-based coatings. This article provides a brief review of the anti-corrosion performance of zeolite coatings, applied by direct synthesis technique to several metals and alloys, as discussed in the literature. **
#Zeolite #Coating #In Situ #Crystall #nanoporous #molecular #sieve #catalytic ##anti-corrosion #environment #chromate-based #chemistry #mineralogy # #science #technology