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ChumpusRex

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  1. ChumpusRex

    Random Scientific Musing of the Day

    My understanding is that air resistance will build up gradually, and hence the weight would increase gradually. I don't really know what the time course of this would be.
  2. ChumpusRex

    Random Scientific Musing of the Day

    The weightlessness is an effect of being in a freefall trajectory - i.e. no air resistance. Once there is atmospheric drag, then the braking force will be felt by the spacecraft - and that braking force will have to be transferred to the astronauts as a feeling of weight. Once a constant velocity is reached, then normal earth gravity would be felt. At some point, however, there would be a need to slow down to reach a stop, and therefore for some of the descent, there will be an effective weight greater than that at rest on earth.
  3. He's wrong on the total amount, but gas central heating is a significant contributor to NOx emissions - with estimates in the 20-25% range of total urban NOx emissions. If diesel emissions are removed, then this will be one of the major remaining sources, and further reductions in urban NOx levels may require applying automotive type emission control systems to GCH systems in the form of lambda control and catalytic converters.
  4. ChumpusRex

    Implication of GDPR on credit checks

    There is no restriction to 1st party processing; the processing can be carried out by a 3rd party (e.g. where necessary, and where the same protection of the data can be assured). Recital 48 of the GDPR makes this explicit, by stating that sharing of data among multiple data controllers may be a legitimate interest. It is easy to see how this applied to financial institutions and CRAs. In their guidance, the ICO use this specific example of lenders sharing data with CRAs, and CRAs then sharing that data with 3rd party lenders as an example of acceptable data processing.
  5. ChumpusRex

    Implication of GDPR on credit checks

    You don't need consent to hold and process personal data. However, you must have a reason (for each individual type of processing). Consent is just one possible reason you could give for processing data. As posted earlier in the thread, other valid reasons are: contract, legal obligation, vital interests, public tasks and legitimate interests. So, as long as a credit reference agency has a valid reason in the above list, they do not need consent. Legitimate interests is a rather broad category, but basically means that you have a strong argument that the benefits (to the public or to the customer) of processing outweigh the privacy risks. In effect, consent is required only in those cases where another reason for processing does not exist. For example, if you order a product from a retailer, then they can process your personal data for the purposes of fulfilling your order, and also completing their tax returns, under the contract and legal obligations reasons. However, if they wish to send you marketing bumf, then that does not fall under any other reason, hence explicit consent would be required for processing for the purpose of marketing. In the case of credit reference, there are strong arguments that legal obligations and legitimate interests exist: Banks and other financial institutions lending money are legally obliged by the FCA to verify that any credit they offer is affordable and avoids over-indebtedness. Part of this includes checking an individual's other credit commitments, hence there is a strong argument that credit reference agencies are processing personal data as part of this legal obligation. CRA data is also potentially valuable for detecting and preventing financial fraud, as a result there is a strong argument that there is a legitimate interest in processing the data, for the purposes of crime detection and prevention. Similarly, CRA data is potentially useful for the tracing and recovery of bad debt, so there is a further argument of legitimate interest.
  6. ChumpusRex

    Property Log

    I don't even recall ever releasing a version for download. Anyway, it's well dead. I gave up on it after I realised I had no idea what I was doing.
  7. ChumpusRex

    30% pay rises for NHS workers.

    However, not everyone gets a good experience. Friends who have developed serious conditions like MS or a stroke have found their private health insurance to be of very limited value, because their insurance would not pay for the ongoing care needed, and instead directed them to the NHS. One of the things to remember is that typical private medical insurance in the UK is that the maximum amount that they will pay for treatments is very limited. For example, if in hospital for illness or surgery, and recovery is slower than exepected, then it's common for them to only pay the hospital bills for the normal convalescence period, so that you have to pay the hospital bill, or more usually, the hospital will ship you off to the nearest NHS hospital.
  8. ChumpusRex

    30% pay rises for NHS workers.

    There are many reasons behind this, but some is made a lot more difficult due to changes in the way of working. For example, junior doctors who do a lot of medical leg work and documentation increasingly work complex rotas where every day they see a different random selection of in-patients, so they have no knowledge of individual cases. For example, this means that if there is a dangerous test result, the contact details on the request form often turn out to be someone who's doing a totally different job on that particular day, and not the person that needs contacting. Equally, it can also mean incorrect documentation as the reason for test. Then there is pressure of time. It would be nice to have time to double check things where possible. 10 years ago when I was training, if a doctor sent a request for a complicated test, like an MRI, there would be some time to check the notes before doing the scan, and double checking what questions need to be asked before scanning to ensure that the correct body part is scanned with appropriate scanner settings, etc. to give the best chance of answering the relevant question. This was fine if a department was doing 30 complex scans per day. Nowadays, it might be 200 scans with only 2x the medical staff. The first thing to go has been the double checking. The problem is that the NHS has been notoriously bad at communication. Most hospitals are still using numeric pagers as the main mode of communication, which makes it impossible to tell if a call is urgent, requires access to a telephone, and assumes that no one else will try to call the paging party and block the line. When I was a junior in one job I used to get about 100 pages per shift, about 20% of those failed because by the time I could get to a phone which was not engaged, the other phone was engaged, or the calling party had been paged to something more urgent, so someone random picks up the phone and knows nothing. There are ways to mitigate this of varying complexity and technology, but getting buy-in is difficult. It also doesn't really help accurate, time-consuming and mentally intensive work when someone is getting interrupted on average every 5 minutes.
  9. ChumpusRex

    30% pay rises for NHS workers.

    That is the standard NHS charge - the dentist doesn't get that, they collect it on behalf of the NHS. The £20.60 includes an examination, scale and polish, X-rays, sealants, photographs, minor complexity assessments and similar minor procedures as required. (i.e. the fee is paid once for as many minor assessments as are performed on that attendance). The dentist bills for that session at a pre-agreed rate to the local clinical commissioning group. The prices are locally negotiated. The dentist then puts in an invoice for what work has been performed (e.g. examination, X-rays and scale/polish), according to the terms and conditions of the contract. One of the ways that CCGs have been putting pressure on the front line is to only fund a certain number of procedures. For example, they are putting caps on the total number of procedures in each billing cycle. For example, if a dentist's CCG will only agree 4000 check-ups per year, then that's all they will pay for. For a dentist with who runs a tight ship and can see 25 cases in a day, that basically means a 3 day week, after which point they aren't getting paid.
  10. https://www.theguardian.com/society/2018/mar/10/housing-budget-817-million-unspent-astonished-mps Councils have returned £871 million pounds ear-marked to build new affordable housing. While a large underspend is always nice, in this case, lack of good quality affordable housing is a critical problem in many parts of the country, and one which many councils are very concerned about. So it seems a bit baffling why councils are cutting back on commissioning new housing when central government are showering them with cash to do so.
  11. ChumpusRex

    The Bubbly Bitcoin Thread -- Merged Threads

    I've been watching the bitcoin community tear itself apart for too long, and doing nothing about it. I lectured someone at work who happened to ask about bitcoins, about the fractured community, the BCH/BTC angst, the fee crisis, etc. and then completely failed to do anything about it, except for rotate into BCH at the top. I'm also now seeing bubbles everywhere - even my mother, who can barely manage e-mail is now getting adverts for ICOs, bitcoin trading, and all manner of other scams; they are even popping up at work where I restricted my web use to only directly work-related stuff. The mad volatility of the last few days has made me decide to rebalance, and only really keep play money in this market.
  12. ChumpusRex

    The Bubbly Bitcoin Thread -- Merged Threads

    Difficult to know. However, the marginal cost is more easily calculated. Based on the most efficient mining technology in widespread use, the energy consumption to mine 1 block (currently generating 12.5 BTC) is at minimum about 500 MWh. So, about 40 MWh per BTC at present. That's around 12 tonnes per BTC assuming 300 g/kWh, but obviously this is highly dependent on the source of electricity. Due to the historically low margins on mining, most BTC mining tends to be in areas where electricity is cheapest which tends to be regions with large amount of hydro.
  13. ChumpusRex

    The Bubbly Bitcoin Thread -- Merged Threads

    Everything that goes on in the channel is subject to change. However, it is possible to structure transactions such that there is no need for trust. Consider the following: Alice goes to a coffee shop, and opens a channel, containing $100. The $100 is transferred to a multisig address, requiring co-signature from both Alice and Barista. Effectively, she has put the money behind the bar as a tab. She orders a coffee. Alice signs a transaction for $5 to the coffee shop and a $95 refund, and then presents that transaction to the barista. The Barista could sign the transaction and broadcast it, closing the channel. Or keep the partially signed transaction on one side and wait and see what happens. Alice orders another coffee. She signs another transaction for $10 to the coffee shop and a $90 refund, and presents it to the barista. The barista could sign the transaction .... After the 3rd coffee and pecan slice, she signs a transaction for $20 and an $80 refund. You get the idea. The point is that at any point, the most recent transaction signed by Alice is proof of available funds. The barista merely needs to sign the transaction to claim the funds and close the channel. Additionally, only one of these staged transactions can ever be valid on the blockchain. The barista cannot sign the $5 transaction, present it to the bitcoin network, and then do the same with the $10 transaction. In this case, the barista waits until such time as he wishes to close the tab, and broadcasts only the final transaction presented by Alice. In the event that Alice makes no purchases, and the barista refuses to close the channel, then the channel has a time out, at which point, the multisig requirement expires, and the channel's funds can be recovered by a single signature from Alice.
  14. ChumpusRex

    The Bubbly Bitcoin Thread -- Merged Threads

    Even thought the Segwit 2x fork had been officially called off, some users decided to continue running the client and mining software, and initiate the fork anyway. The result was catastrophic failure, as the software froze before the scheduled fork block. Multiple bugs have subsequently been found in the fork activation code, as well as problems with the default configuration of the software. Considering that the fork was only cancelled at the 11th hour, and this fork was supposed to "become bitcoin", the incompetence (the main bugs were an "off by one" error in the fork activation logic, and a "variable used before assignment" flaw in the mining code) and lack of testing is telling. Meanwhile, the hard fork of BCash has resulted in a number of people failling to upgrade and running/mining the old fork, which seems to have had some life injected into it by the emergency difficulty adjustment system.
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