Dennis peterson ethereum

The Bitcoin network is burning a large amount of energy for mining. In this paper, we estimate the lower bound for the global mining energy cost for a period of 10 years from to , taking into account changes in energy costs, improvements in hashing technologies and hashing activity. We estimate energy cost for Bitcoin mining using two methods: Brent Crude oil prices as a global standard and regional industrial electricity prices weighted by the share of hashing activity. Despite a billion-fold increase in hashing activity and a million-fold increase in total energy consumption, we find the cost relative to the volume of transactions has not increased nor decreased since This is consistent with the perspective that, in order to keep the Blockchain system secure from double spending attacks, the proof or work must cost a sizable fraction of the value that can be transferred through the network. Bitcoin is a digital currency launched in by an anonymous inventor or group of inventors under the alias of Satoshi Nakamoto Nakamoto,

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Dennis Peterson

Angove served the Actuarial Society of South Africa as an examiner for many years. She initially studied psychology but discovered actuarial science which become her true passion. She started her actuarial career working as a consulting actuary at Quindiem, and then combined her enthusiasm of teaching and actuarial science by taking on a major-time lectureship at Wits. She was deeply committed to her students and took special care in being accessible, supportive and nurturing. Her projects across Africa have been instrumental in developing risk protection.

In she also took on a part-time role with the Financial Services Board which became the Financial Sector Conduct Authority and was involved in supporting the development of microinsurance regulation. She was a member of the Products Standards Working Group commissioned by National Treasury in and an observer member of the MicroInsurance Network and a member of the associated working group. She coordinated the A2ii's regional implementation work in Sub-Saharan Africa, strengthening cooperation and supporting capacity building for supervisors in the region.

She also supported various projects of the Finmark Trust over the years and most recently served as a member of the FSD Network where she presented at seminars and moderated forums.

Her sessions for the A2ii and FSD Network were extremely well-received reflecting her dedication to the task as well as her well-honed teaching skills. She lived in Parkview with her cheerful household menagerie and was committed to the community as a member of the Rotary chapter. She leaves behind her mother Barbra, brother David and his family. Her Wits colleagues will miss her cheerful nature and unfailing willingness to lend a hand or offer support.

Born in South Africa, Watt always had an aptitude for maths and science. After completion of this PhD, Watts returned to South Africa to work for Ove Arup where he designed bridges and managed construction projects. This led to his selection as project manager for the revolutionary Centre Pompidou in Paris. He learned to speak, read and write French fluently in six months at the beginning of his tenure as project manager.

After Paris, he worked in the Ove Arup London office for four years before emigrating to Texas with his family in He formed Brian Watt Associates, after working for Shell, which became renowned for designing pioneering deep water drilling platforms and floating island technology used in the Arctic.

Following a rich and diverse professional career in engineering and business, he retired to a life of sailing. During that time he remarried, visited remote islands, explored new cultures and survived sailing through a cyclone and visited over 40 countries.

In a severe car accident in Louisiana left him permanently disabled. He had to give up sailing but enjoyed many years living near in Key Largo, Florida before moving to Texas in He lived a life of learning, adventure, mentorship.

His tenacity, intellect, generosity changed the lives of those he knew and loved. He was a renowned biophysicist in the field of bioenergetics, expert in mathematical modelling of molecular machines and biological oscillations. Professor Caplan was born in in London, but grew up in South Africa and was educated at Wits, receiving his bachelor of science degree cum laude in in chemical engineering and his PhD in focusing on physical chemistry of macromolecules in solution.

He then worked at the National Chemical Laboratory in Teddington in England until , when he moved for two years to the NIH as a visiting scientist. Following a sabbatical leave at the Weizmann Institute , he immigrated to Israel and became an associate professor at the Weizmann Institute as of In he became a full professor. Subsequent to the foundation of the Department of Membrane Research by Ora Kedem, Professor Caplan succeeded her as departmental chair He chaired the department again in In he became a Professor Emeritus but continued to be scientifically active.

His studies at the Weizmann Institute were first focused on energy conversion processes and systems, with an emphasis on membrane transport. He, together with Ora Kedem and Aharon Katzir, developed a new approach to such systems — non-equilibrium thermodynamics. As of the mid-seventies, his group started to study in addition to thermodynamics of transport processes through biological membranes the properties, kinetics, and proton-pump activity of bacteriorhodopsin in the purple membrane of archaea wrongly considered then as halobacteria.

These were the first years of studying bacteriorhodopsin and his group published ample of papers in leading journals about this. When Professor Caplan approached retirement, he mainly focused on mathematical modelling of molecular machines.

These included, among many others, microscopic reversibility in enzyme kinetics, electrochemical potential, and the mechanism of rotation of the flagellar motor. Musician Bruce Gardiner BMus died peacefully at home a month short of his 89 th birthday on 9 November His legacy is encapsulated in the piano classics and keyboard melodies he performed in many auditoriums, churches and school halls.

Gardiner was brought up in an era when swing, big bands and jazz were popular and he was influenced by pianists such as Carmen Cavallaro and Dave Brubeck. Gardiner was born in Queenstown, now Komani, to Dr Ivor and Bernadine Gardiner and was schooled at Queen's College, to which he returned regularly throughout his life to give fundraising concerts.

A severe illness at an early age prevented any meaningful participation in robust sport so his mother, a pianist in her own right, encouraged Gardiner to learn to play the piano. As a schoolboy he put his talent to good use by playing at assemblies and at raucous inter-schools rugby matches where he could be found at the keyboard of a honkytonk piano to the great delight of the crowd.

At Wits he obtained his music degree, and proceeded to London where he spent a year acquiring his performer's licentiate. Armed with a few formidable qualifications, Gardiner returned to South Africa and took up a position as head of the music department at the East London Technical College. He spent many happy years in East London with his wife Nell and his three growing children until Nell fell ill in the early s and the family moved to Cape Town for specialised treatment.

Shortly before the Gardiner family left East London, his friend Donald Woods, editor of the Daily Dispatch at the time, unobtrusively solicited donations from the city's business community to purchase a grand piano in recognition of his services to music and education.

On the piano he had inscribed: "To Bruce from the citizens of East London. It was still in his home to the day he died and remained a treasured memory for life. Nell succumbed to her illness and in Bruce took up the position as head of the music department of the University of the Western Cape, where he became a revered member of staff until he retired in His elegant style and delicate touch in shows enchanted listeners all over the country.

He is survived by son, Ivor, daughters Debra and Julia, eight grandchildren, seven great grandchildren and a multitude of devoted fans throughout the country. He registered for a bachelor of science at Wits, majoring in botany and zoology and completing an honours year in His introduction to conservation followed when he was appointed to a section of the Nature Conservatory at Etosha in the then South West Africa. This experience stood him in great stead: throughout his career, he set out to fully explore any project he dealt with, to gain a complete understanding of all dynamics of the system: be it environmental, social, human or bureaucratic.

With game ranching recognised as a bona fide agricultural land use by the Department of Agriculture, Dr Grossman was appointed as deputy director, research tasked with setting up the game ranching unit. In Dr Grossman left the formal agricultural sector and began a highly successful consulting career. His wicked sense of humour and adventurous spirit is legendary together with an amazing sense of wonderment and empathy about everything natural, wherever it was.

He once described a visit to the Kunene River as being deeply spiritual: the place spoke and he heard. Ultimately, Dr Grossman was shyly proud of the community-run, commercial game and hunting ranch that emerged from his efforts and which remains the only current example of a successful aboriginal land claim in southern Africa.

Mark Henning BA Hons , BEd was born on 26 March into a family of teachers and enjoyed a distinguished career spanning five decades. The former vice-president of the World Confederation of Private Education was also involved in cricket administration on national level and vice-president of the South African Cricket Association during His father, Daniel Henning, taught at King Edward VII for more than 50 years and he embraced his educational philosophy: for harmony, not discord; tolerance, not prejudice; and love, not hate.

On his retirement, Henning took on the role of editor for Independent Education magazine for 12 years. He also remained active within educational circles, and was a member of a number of investigative government commissions into education. He was married to Sheila nee Macaskill who preceded him in death eight years ago shortly after their 52 nd wedding anniversary.

He was born in Kroonstad on 8 March in , and moved to Johannesburg with his family at the age of four. He went to school in Springs, on the East Rand and considered being a medical doctor like his father, Benjamin. But after matriculating in , he enrolled for a BCom at Wits and as a result of an uninspiring job shadowing experience with his accountant uncle, he decided to pursue a career in law instead.

Advocate Kuny was largely apolitical, unlike his Wits classmates and peers. It was really a critical point in our lives. When they returned to South Africa he was admitted to bar as an advocate in February A month later came the Sharpeville massacre and his involvement in political cases began.

He started by defending a host of black South Africans involved in small offences such as pass burning, demonstrations, breaching banning orders and membership of a banned organisation. Hamburger was the secretary of the Defence and Aid Fund, and she roped him into defending PAC youngsters who had no one to defend them.

Most of his cases were fought in small towns in front of aggressive judges and prosecutors. He used his skill on cases that he believed mattered, shunning a lucrative commercial career.

Advocate Kuny shunned the limelight. He was a talented jazz pianist. There was a piano there which he started playing. He looked slightly down and out. One of the pioneers of Australian merchant banking, David Block BProc died aged 85 in Sydney on 14 August after a short illness.

He passed away at the age of 89 on 20 October He devoted his life to the practice of medicine almost exclusively in the public sector, serving the poorest of the poor in Soweto during and after apartheid. Aaron ran religious services in Belfast and Nigel and later became a shochet qualified to slaughter meat according to Jewish law.

They settled in Roodepoort and had three children Maurice, Tzilla and David. He gave unswerving and loyal service to the Department of Medicine at the Chris Hani Baragwanath Hospital for more than five decades: initially as registrar, then as physician, senior physician, principal physician and head of one of the large medical units.

After his retirement in , he continued to work in the department as Honorary Professor, sharing his extensive knowledge, experience and wisdom with students, doctors and patients. Professor Blumsohn possessed all the qualities of a great physician. He had an outstanding intellect, an encyclopedic knowledge of medicine, and an ability to inspire students.

But above all, he was a humanitarian, ever-sensitive to the predicament of the downtrodden. He practiced what he preached: he treated all his patients with dignity and respect and was always available to them. He was at the forefront of a campaign at Chris Hani Baragwanath Hospital in in which doctors from the Department of Medicine protested at the deplorable conditions patients had to endure.

Professor Blumsohn published widely in the medical literature but he has also been invited to leading cardiological and other medical institutions in North and South America as visiting professor, researcher, or teacher.

He regularly received letters and gifts from the students expressing their gratitude for his teaching, philosophy, guidance and mentoring, and for showing them the importance of patient-centered medicine. Professor Blumsohn also held a doctorate in Semitic languages and was extremely widely read. In recognition of his extraordinary contribution to the University, its students and the community of Soweto, he was awarded a Gold Medal in

Expression Dysregulation as a Mediator of Fitness Costs in Antibiotic Resistance

Love your service. Looking into it, we have less-than-positive news to report. The TokenCard team seems to be taking the issue of mis-distributed funds lightly, have frozen transactions until they have a resolution, and overall seem to think that downplaying the issue is the best way forward. This is not true at all. For, it was only very recently that Bitcoin Unlimited enjoyed rather large support. Then, a bug in their code gave competing implementations and detractors the opportunity to declare the Bitcoin Unlimited team as incompetent.

The promotion of first-generation or eth- “Vulnerability Analysis and Disasters.” In Floods, ed. Dennis. J. Parker, 43– London: Routledge.

can you buy and sell ripple on bitstamp

Chriseth at github casually pointed out a terrible, terrible attack on wallet contracts that I had not considered. If there were a responsible disclosure avenue for ethereum contract developers, I would use it, but there doesn't seem to be. Not only that, this code has been out and published on github for long enough that I wanted to get the news out there quickly. In Brief : Your smart contract is probably vulnerable to being emptied if you keep track of any sort of user balances and were not very, very careful. As always, I'm available for smart contract review and audit, email me. You can read about other security considerations on my blog here. He says as written, the attack is less worrisome than I say because by default send only offers 21k gas, this will not be enough to pay for the nested calls. However, if you use call. I am testing a few permutations and will update.

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dennis peterson ethereum

Angove served the Actuarial Society of South Africa as an examiner for many years. She initially studied psychology but discovered actuarial science which become her true passion. She started her actuarial career working as a consulting actuary at Quindiem, and then combined her enthusiasm of teaching and actuarial science by taking on a major-time lectureship at Wits. She was deeply committed to her students and took special care in being accessible, supportive and nurturing.

To change attitudes, change incentives.

Edsger W. Dijkstra

Try out PMC Labs and tell us what you think. Learn More. Antimicrobial resistance AMR poses a threat to global health and the economy. Rifampicin-resistant Mycobacterium tuberculosis accounts for a third of the global AMR burden. Gaining the upper hand on AMR requires a deeper understanding of the physiology of resistance. AMR often results in a fitness cost in the absence of drug.

Block or report DennisBPeterson

Ethereum Stack Exchange is a question and answer site for users of Ethereum, the decentralized application platform and smart contract enabled blockchain. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Below I extracted the logic which calls a remote contract to calculate the amount of tokens to withdraw funds. I've searched solidity documentation for an answer but with no success. What I'm wondering or better what I'm afraid about is that when a call to a remote contract is executed, the contract function looses atomicity.

ClimateCoin by Dennis Peterson Ethereum is a platform for cryptocurrency applications, currently available in an early experimental version.

A university professor for much of his life, Dijkstra held the Schlumberger Centennial Chair in Computer Sciences at the University of Texas at Austin from until his retirement in He was a professor of mathematics at the Eindhoven University of Technology — and a research fellow at the Burroughs Corporation — In , he became the first person who was neither American nor British to win the Turing Award. One of the most influential figures of computing science's founding generation, [2] [3] [5] [6] [12] [13] Dijkstra helped shape the new discipline both as an engineer and a theorist.

Cryptocurrency is constantly in the headlines. The mixup may be because the media is either telling us that this is the currency of the future or the worst thing to ever happen to money. However, one thing is clear: Scams abound. So, which cryptocurrencies are best for long-term investment? We want to avoid that. Here we want to list cryptocurrencies that some experts believe we could invest in for a year or longer and see our initial investment grow.

Dennis is credited on the vinyl both LP and fan club 45 but not the CD for some reason. For example, a random variable could be the outcome of the roll of a die or the flip of buy wavebase coin coin.

Cold-adapted species are thought to have had their largest distribution ranges in central Europe during the glacial periods. Postglacial warming caused severe range shifts of such taxa into higher latitudes and altitudes. We analysed five polymorphic microsatellite loci in individuals sampled at 50 different localities scattered over the European distribution area of the species. Genetic differentiation was strong among the mountain ranges of western Europe, but we did not detect similarly distinct genetic groups following a geographical pattern in the more eastern areas. The Fennoscandian populations form a separate genetic group, and provide evidence for a colonization from southern Finland via northern Scandinavia to south-central Sweden. Species distribution modelling suggests a large extension of the spatial distribution during the last glacial maximum, but highlights strong retractions to a few mountain areas under current conditions.

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