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Killexams : HP Administrator test - BingNews Search results Killexams : HP Administrator test - BingNews Killexams : Can COVID rapid tests really detect if you’re contagious with new omicron variants?

The alarming spread of omicron subvariants — particularly BA.5, which has quickly become the dominant coronavirus strain in the U.S. — has again put a spotlight on how well COVID-19 rapid antigen tests work at this stage in the pandemic.

While some early research and anecdotes have suggested that at-home test kits may not be as good at spotting omicron’s sneaky subvariants, Bay Area infectious disease experts say the rapid antigen tests are still an effective way to diagnose infection.

But they add that variants like BA.5 only drive home the importance of using rapid antigen testing as effectively as possible to avoid a false negative result.

Also, experts say it’s still the case that while rapid tests are quicker and easier than PCR tests, they are also less sensitive and therefore more prone to inaccurate results.

That problem has been magnified by this summer’s surge, during which some people with COVID-19 symptoms have reported initially testing negative, said Stanford virologist Robert Siegel.

But the reasons for that may not be limited to BA.5 or omicron subvariants alone, infectious disease experts say.

Rapid antigen tests may generally provide a good indication of whether an infected individual is contagious, but as has been the case throughout the pandemic, they are not foolproof.

A exact report combing the results of 155 studies, known as a Cochrane meta-analysis, concluded that antigen tests correctly identified COVID-19 infection in an average 73% of people who were symptomatic and 55% of people who were not.

The study also found that tests were more accurate when used in the first week after symptoms began. As a rule of thumb, rapid antigen tests work best when there is a high “pretest probability” that someone is infected (i.e., that they have symptoms or know they were exposed), when they are done every day, and are from a reliable manufacturer, experts said.

So, how does that change with BA.5? Experts say the answer is complicated.

The subvariant is very new on the pandemic scene, first detected around the beginning of this year. Peer-reviewed and preprint literature on the performance of rapid antigen tests does not yet seem to include anything specifically about BA.5 — though at least one study has shown that a combined nasal/throat swab demonstrated improved sensitivity compared to swabbing the nasal passages alone, said Benjamin Pinsky, director of the Clinical Virology Laboratory at Stanford.

Initial small studies have suggested that in the earliest stage of infection, omicron might be most concentrated in the throat, rather than the nose or nasal pharanyx. However, “I’m not sure (that theory) has panned out with large numbers of individuals,” said UCSF infectious disease expert Peter Chin-Hong.

Although some experts have backed throat-plus-nose swabs for at-home tests, neither the Centers for Disease Control and Prevention nor the Food and Drug Administration has endorsed that approach.

Most infectious disease experts still recommend people follow the CDC’s guidance on proper use of antigen tests, as well as the instructions provided with each test, to ensure their accuracy.

Another factor that could interfere with rapid tests is immunity gained from past infection or vaccination, both of which yield antibodies that could produce an early false negative, Siegel said.

Experts overall still recommend PCR tests as the “gold standard.” They detect the presence of viral DNA and are not affected by the presence of antibodies — unlike rapid antigen tests, which detect the presence of a viral spike protein and can be greatly affected by timing and human error.

Another possible reason for inaccurate results from rapid antigen tests may relate to the choices people make when they administer it, experts said. Some symptomatic people test too early or too late, or provide up after one negative test.

Here are the best ways to use a rapid antigen test if you think you have COVID-19, according to experts:

First, make sure the test you are using is from a reputable manufacturer, and follow all the instructions.

If you feel sick, take an antigen test as soon as possible. If you are symptomatic and test negative, mask up and test again the next day. Don’t assume that one negative rapid test is accurate.

If you are still feeling sick and testing negative, strongly consider a PCR test, which will be the most sensitive. Meanwhile, make sure you are self-isolating, especially from people who may be more vulnerable to COVID-19.

“I think at the end of the day (rapid antigen testing) is a good measure of infectivity,” said Chin-Hong. “The bottom line is for people not to stop at one test, or to think about a PCR if they think they might have COVID-19.”

Annie Vainshtein (she/her) is a San Francisco Chronicle staff writer. Email: Twitter @annievain

Mon, 08 Aug 2022 16:31:00 -0500 en-US text/html
Killexams : ConveGenius Insights conducts largest tablet-based assessment in Himachal Pradesh No result found, try new keyword!The digital assessment took place among 21,309 students across 1,115 schools in 12 districts of Himachal Pradesh. Tue, 09 Aug 2022 00:16:47 -0500 en-in text/html Killexams : HP ZBook Firefly G9 review: A futuristic look for a mobile workstation
HP ZBook Firefly G9 review: A futuristic look for a mobile workstation


The HP ZBook Firefly G9. PHOTO: Handout

You know that HP’s ZBook Firefly G9 laptop differs from other laptops in its lineup when you see the big Z emblazoned across the cover. Like other ZBooks, this one is aimed at professionals who need the horsepower of a workstation on the go.

The looks match that too. The shiny silver-coloured chassis gives the laptop a level of sophistication so it’s something an executive would have no issue bringing around to meetings. The 1.47kg laptop isn’t the lightest but it is slim.

What’s more important to its potential buyers is an engine that can crunch data, effortlessly create PowerPoint slides and even edit videos on the go.

Armed with a 12th-gen Intel Core i7-1255U processor, 32GB of RAM, an Nvidia RTX A500 graphics chip and a 512GB NVMe solid state drive (SSD), the ZBook Firefly G9 has ample horsepower to run the latest professional applications.

Brushed metal cover and the “Z” provide the ZBook Firefly G9 a neat look. PHOTO: Wilson Wong

These specs also suggest that the laptop can be a mobile video editing machine. A quick performance test using the Cinebench R23 benchmark came back with a multicore score of 6,961, which is decent but not the highest in its class.

The score is lower than the 9,542 I got from the Asus VivoBook Pro 16X OLED laptop, which I tested separately. The Asus laptop had an AMD Ryzen 7 5800H mobile processor, 16GB of RAM, an Nvidia GeForce RTX 3050 Ti graphics chip and a 1TB SSD.

To be fair, the Asus machine is designed for content creators, so it is not surprising that the business-centric HP ZBook did not score as well.

What the HP ZBook has going for it is an excellent keyboard layout that makes it easy to touch-type. There is ample space between keys to avoid accidental keystrokes. Plus, the keys offer good tactile feedback.

The Nvidia graphics chip onboard powers the 14-inch WUXGA (1,920 x 1,200) display. The screen has a narrow bezel and, at 250 nits, is bright enough to be used in most situations. The screen represents 100 per cent per cent DCI-P3 colour gamut, which is great for editing photos and videos.

HP has also included an integrated privacy screen. This way, you can prevent prying eyes from looking when working with sensitive information, say, on a plane as travel resumes.

The keyboard is well spaced out with good tactile feel. The fingerprint scanner is located just below the right arrow key. PHOTO: Wilson Wong
The integrated privacy screen feature helps prevent peeking from the side. It does darken the screen though. PHOTO: Wilson Wong

Danish audio company Bang & Olufsen tweaks the sound system for the ZBook. The audio is clear, although lacking in bass. It may have sounded better if the speakers are facing towards the front rather than downwards.

The laptop has a variety of ports with USB-A and a 3.5mm audio port on the right side, with two USB Type-C ports, one USB-A and one full-size HDMI port for the monitor or projector on the other side. I can charge the laptop via the Type-C thunderbolt ports on the left.

That said, you’ll need to buy a separate USB-Type C dongle if you require a SD card reader or wired network connection. So, do factor in the cost if these are important.

Enough ports for most users. You can expand the ports by purchasing a Type-C dongle. PHOTO: Wilson Wong

As a business-focused laptop, the ZBook Firefly G9 comes with features that you’d expect from a corporate-issued machine.

There is an embedded Tile Tracker to locate a lost ZBook, secure BIOS update over the network and various security and anti-malware apps that make the job of your organisation’s IT administrator easier.

There is a fingerprint scanner at the bottom right corner of the keyboard for secure and easy logins. I prefer power buttons with integrated fingerprint scanners because they serve both purposes of switching on the laptop and gaining access securely using my finger without having to search for the scanner.

One final thing to note is that the ZBook Firefly G9 runs warm after when pushed. It certainly did when I was running the performance tests. So, remember to prop it up for the internal fans to cool the hardware more efficiently.

Costing S$2,670, the ZBook Firefly G9 has great features for corporate users but they can be overkill for regular consumers. For content creators, there may also be other alternatives offer better screen resolution and a zippier graphics chip for video rendering.

Thu, 04 Aug 2022 18:46:00 -0500 en-GB text/html
Killexams : 2023 Mazda CX-50 Review: Looks Aren’t Everything

Despite using a different platform, the CX-50 drives a lot like its CX-5 sibling. One thing usually present in Mazda vehicles is communicative steering, and that’s still the case in the CX-50. Unfortunately, it lacks other on-road capabilities that could take full advantage of that: The ride is brittle, and impacts were harsh with the 20-inch wheels that come standard with the 2.5 turbo engine. Aggressive cornering produces body roll and some understeer, though not any more than you’ll find in pretty much any SUV in this segment. Most competitors, however, also have steering that feels much more numb.

For more detailed off-road impressions, you can read my extended thoughts here. Without driving a CX-50 equipped with the Meridian treatment, which includes more serious all-terrain tires, it’s hard to gauge just how capable the CX-50 could be. We can speak to its performance with street tires and 20-inch wheels, though, and with that setup, the CX-50 successfully navigated a light off-road course, but it never felt happy doing so. The CX-50 is meant to be the vehicle that gets you and your gear to the trailhead, not one that goes down the trail, but in most of those instances, you’d be just as successful getting there in a Camry. The CX-50 is not meant for serious or frequent off-roading, so if you’re looking for something like that, look elsewhere.

It’s possible the Meridian Edition, with its smaller wheels and beefier off-road tires, might feel both more capable off-road and cushier on pavement, but it’s probably not going to supplant some of the more capable soft-roaders in its segment, like the Ford Bronco Sport Badlands, the Subaru Forester Wilderness or any of the multiple Toyota RAV4 TRD models.

The CX-50’s fuel economy is decent, at least, and there’s not much of a penalty for getting the more powerful turbo engine. The naturally aspirated 2.5 is rated 24/30/27 mpg city/highway/combined, and switching to the turbocharged powerplant drops those ratings only slightly to 23/29/25 mpg. Of course, to get the most horsepower and torque out of the turbo 2.5-liter — 256 hp and 320 pounds-feet — Mazda recommends using premium gas. That’s of course more expensive than regular, and the 2.5 turbo doesn’t provide overwhelming power on it; it’s unlikely that owners will miss the extra 29 hp or 10 pounds-feet of torque if they opt for regular. The turbo engine provides adequate power when called upon, but it can sound strained and unrefined under heavier loads.

The CX-50 also adds two new drive modes: Off-Road and a turbo-exclusive Towing. Off-Road helps a bit when the going gets tough, but there’s no additional configurability beyond “Off-Road” to help with specific types of terrain. Towing mode is exclusive to turbo-powered CX-50s, which can tow 3,500 pounds versus the 2,000 pounds the non-turbo CX-50 can pull. The other driving mode worth mentioning is Sport, but that’s just to note that it doesn’t do much to change the character of the CX-50.

Comfortable, Frustrating Interior

The front and rear seats of the CX-50 don’t feel much roomier — or really much different at all — from a CX-5. The CX-50’s more aggressive roofline and Mazda’s first power-sliding panoramic moonroof cut into headroom a bit, but there’s not an uncomfortable seat in the car. The CX-50’s cargo area is also impressively roomy, if basic, with two small cubbies for smaller items. (They were, for instance, a great place to put some precious six-packs of Wisconsin-exclusive New Glarus beer when driving home to Illinois.) We measured the CX-50’s cargo volume at 18.13 cubic feet — nearly identical to the 2021 CX-5 we measured at 17.91.

What’s problematic is Mazda’s infotainment system. The larger 10.25-inch display in our test vehicle (an 8.8-inch screen is standard) is technically a touchscreen, but it doesn’t function as such in most situations. Touch control only works when the vehicle is not in motion; when the car is driving, a knob controller is the only way to navigate the display and make selections. At least, that was the case before Mazda gave touchscreen functionality back when using Apple CarPlay and Android Auto. It’s a smart decision given how much easier it is to use a smartphone-mirroring interface like you use a smartphone. Both those interfaces work wirelessly, though I noticed some slight lagginess in wireless CarPlay when quickly cycling through songs.

While bringing back touchscreen capability is nice, the screen itself is positioned so high and deep on the dashboard that even longer-armed drivers and front passengers may have trouble reaching it. I alternated between using the touchscreen and the frustrating knob depending on the situation and how comfortable I felt leaning forward.

If you’re not using Apple CarPlay or Android Auto, the rest of the user interface looks dated and can be confusing. It feels like Mazda is mimicking early iterations of BMW’s iDrive before the Bavarians worked out all the kinks.

Some of the CX-50’s competitors have their own quirks and foibles when it comes to this stuff, but for an all-new vehicle like the CX-50 to have the same old tech that’s frustrated us in other Mazdas is disappointing.

Mazda aims to be seen as a more premium automaker than, say, Toyota or Honda, and the CX-50 is trying to live up to that goal. Its interior materials are a step above competitors’, and build quality is top-notch. Physical controls have a solid feel, and an available head-up display is a premium touch. Compared with an Acura RDX, the CX-50 may not come out ahead, but compared with a Honda CR-V or Toyota RAV4, it is likely to impress.


The CX-50 has a number of standard active safety features, including Mazda’s low-speed City Brake Support automatic emergency braking with pedestrian detection, as well as lane departure warning, lane keeping assist and blind spot monitoring with rear cross-traffic alert. I didn’t find these features overly intrusive or unhelpful during my time in the CX-50, which isn’t always the case. The optional head-up display was nice, if very basic in its functionality.

As of this writing, the CX-50 has not yet been evaluated by either the Insurance Institute for Highway Safety or the National Highway Traffic Safety Administration. In our own Car Seat Check, the CX-50 earned mostly Bs and one A grade.

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Related Video:

Should You Buy a CX-50?

Looks are subjective, but to me the CX-50 distinguishes itself with its exterior styling. Compared with the CX-5 and the segment as a whole, the CX-50 is much more aggressive-looking, with boxy flared fenders and a large grille that provide it a somewhat undeserved air of sportiness. But if appearance matters to you, the CX-50 is perhaps the handsomest of the bunch, and that alone may make it worth a purchase.

Pricing for the CX-50 starts at just under $29,000, but our loaded test vehicle rang in at over $43,000 — not a small chunk of change, and certainly in the more premium realm of compact SUVs. The Meridian Edition, the most off-road capable CX-50, is a $2,800 premium over a base turbo-equipped model, at $41,225 (including destination).

Many compact SUVs ask buyers to make do with no bigger engine to opt for or to turn to hybrid powertrains for increased performance. In that regard, the CX-50 and its optional turbo engine are a pleasant alternative. With its upmarket features and interior appointments, the CX-50 is a strong choice in a crowded field. So, however, is the CX-5.

The CX-50 doesn’t do a lot of things wrong, but other than its looks, it also doesn’t stand out from its CX-5 sibling — and if you’re looking for an off-road-friendly vehicle, there are better choices.’s Editorial department is your source for automotive news and reviews. In line with’s long-standing ethics policy, editors and reviewers don’t accept gifts or free trips from automakers. The Editorial department is independent of’s advertising, sales and sponsored content departments.

Mon, 08 Aug 2022 20:04:00 -0500 en text/html
Killexams : Local motorcycle racer Scott Briody killed in track crash

A local man was killed in a motorcycle crash during a qualifying session Friday at Brainerd International Raceway in Minnesota, according to MotoAmerica, an organization that promotes motorcycle racing.

Scott Briody, 50, of Hannacroix, died in a single-vehicle crash while he competed in MotoAmerica’s Stock 1000 class first qualifying session, the organization wrote on a posting on its website.

“We are deeply saddened by the passing of Scott Briody,” MotoAmerica COO Chuck Aksland said. “Our thoughts and prayers go out to his family, his team and the MotoAmerica paddock.”

Briody was the CEO of Innovative Test Solutions, a mechanical engineering and testing laboratory based in Schenectady, a company official confirmed. The Daily Gazette reported earlier on the crash.

It is not the first time the Kings Road firm has been touched by tragedy.

Two years ago, businessman and former Rensselaer mayor Joseph Kapp, 67, died when a food processor being tested for the manufacturing of guacamole exploded. Two other people were hurt in the Aug. 5, 2020 blast.

Tue, 02 Aug 2022 04:25:00 -0500 en-US text/html
Killexams : Time for Himachalis to ensure BJP again forms govt in state: Jai Ram No result found, try new keyword!Addressing a gathering in Subathu in Solan, HP chief minister Jai Ram Thakur said the country attained freedom after a long struggle and sacrifices ... Mon, 08 Aug 2022 06:49:25 -0500 en-in text/html Killexams : Eli Lilly’s Covid-19 Antibody Treatment to Be Sold Commercially

Eli Lilly & Co. said it plans to begin commercial sales of its Covid-19 monoclonal antibody treatment to states, hospitals and other healthcare providers this month, as the federal government’s supply of the drug is nearly depleted.

The move marks a shift away from the way Lilly’s drug and most other Covid-19 treatments and vaccines

have been distributed in the U.S. It will likely be the first test of whether the vaccines and treatments would remain accessible if shifted to a commercial market.
Wed, 03 Aug 2022 06:11:00 -0500 en-US text/html
Killexams : Test drive: Peterbilt's refreshed Model 579

When Peterbilt debuted its refreshed Model 579 last year it marked a fairly significant revamp – at least for Paccar, which has historically favored small refinements over full-blown reinvention. 

The 579, indeed, is an enigma unto itself, a slick aerodynamic departure from its boxy, long-nose, flush-with-chrome family lineage.

When the Model 579 burst onto the scene a decade ago, it was a signal that Peterbilt – one of the on-highway OGs – understood that fleets' appetites for trucks were changing. "Chrome don't get you home," driver amenities and fuel efficiency were the new names of the game, and the 579 took Pete's seat at the aero table.

[Related: Test drive: Kenworth's sleek updated T680]

Since its debut in 2012, the Model 579 – now Peterbilt's on-highway flagship – has received a few of the aforementioned refinements, like the addition of the hyper-aerodynamic EPIQ package in 2014 and long-awaited integrated sleeper, UltraLoft, four years later. Beyond those, design or technology upgrades were incremental and subtle. 

In a lot of ways, the new Model 579 is an all-new truck. The lone exception being that it's been around since the Obama administration. 

I took Pete's retooled Model 579 on a nearly 200 mile jaunt around North-Central Texas. The black and chrome EPIQ was as much old school throwback as it was a demonstration of modern technology and freight efficiency. 

On the power side, the new MX-13 engine gets a 2% fuel economy bump, while the MX-11 will see a 2.5% bump as of the 2021 model year. As for the rest of Pete's updated Model 579s, technology and aerodynamics do the heavy lifting.

All-new (but not really)

Peterbilt Model 579Boasting a 7% fuel economy improvement over prior generation models, the new Model 579 is the most aerodynamic and fuel-efficient Peterbilt model built to date.As aerodynamic as its predecessor was, the new 579 doubles down. Peterbilt Marketing Director Jorge Medina noted the radiator dropped to Strengthen airflow and comes with the side benefit of better visibility. 

Boasting a 7% fuel economy improvement over prior generation models, the new Model 579 is the most aerodynamic and fuel-efficient Peterbilt model built to date. The truck appears noticeably more narrow, the hood is lower, and the aerodynamic mirrors are a bit shorter. Standard halogen headlamps have been improved, and heated LED headlights are available.

Visibility from the driver's seat is excellent, but the shorter side mirrors take some getting used to. On the outside, the 579 appears to have the long snout you'd expect of a legacy tractor, but when you hop inside it basically disappears. 

One of the more subtle design changes – if not the only subtle one – is the integration of Pete's iconic "bird" hood ornament/pull handle, which has been accented in the hood's side vents and on the rear wall. 

A new three-piece front bumper integrates the forward radar cover for collision mitigation with a larger aerodynamic air dam. Improvements to the aero mirrors, fairings, side skirts and closeouts help Strengthen the overall aerodynamic shape and an A-pillar vane slings airflow around the windshield to reduce friction, delivering a 10% noise reduction in the cabin. 

You can maintain a conversational voice level in the cab at highway speed. In fact, I found that when road noise inside the cab spiked, it was usually coming from the vehicle beside me. The pillar-mounted vanes are so effective at moving air down the side of the truck and trailer that when you lower the window, the noise level barely increases, and the air inside the cab is calm – even at 60-plus mph. 

It was over 100-degrees for the duration of the drive, so the window didn't spend a lot of time down. Peterbilt also designed its upper dash and door panels to be glare resistant, keeping the sun, which was mercilessly beating us down, from washing out the glass. 

Technology touches  

A brightly lit 15-inch digital display replaces a traditional analog gauge cluster. It's fully customizable, allowing drivers to pick and choose how much (or how little) information they want to see. This is probably my favorite feature. I like having a lot of driving data in front of me: air system pressure, engine temp, etc., and I like not having to peek to the wing panel to see it. I can see everything I want to see with a quick glance down between the yokes. I also like that the display is infinitely customizable, so if I drop my trailer I can hide trailer air pressure, or I can cycle something else into that spot on the screen.

I appreciate the old-school look and reliability of analog gauges as much as the next guy, but the digital display is simply a better way to package all this information. The screen prioritizes alerts. If the coolant level is low, for example, it's brought front and center on the screen, even if the alert category isn't something the driver has selected for on-screen monitoring. 

And, yes, there are redundancies in place, and, no, one blown fuse won't black out the entire screen and send you hurdling down the highway at unknown speeds with unknown air pressure levels. 

The digital display can also perform a systems check – a pre-trip inspection of sorts – on 13 systems, displaying a green checkmark with each passed test. Post trip, a detailed trip information screen provides a breakdown of noteworthy metrics from the most exact journey. 

The new Model 579 features an Advanced Driver Assistance System (ADAS) with integrated camera and radar technology, including collision mitigation, overspeed alerts and lane-keep assist. Lane-keep assist is a handy feature considering that one in five truck fatalities are linked to unintended lane departures, according to Bendix.

Lane keeping, road crown and crosswind correction inputs are made through the steering column’s electric motor, so you barely notice it until it activates and gently nudges you back into your lane. Overall, steering has a very light and responsive feel. 

On-highway manners, back office performance 

Peterbilt 15-inch driver displayEquipped with an MX-13 (455 hp and 1,650 ft-lb torque) and 12-speed Paccar transmission, my 579 EPIQ and I routinely were getting more than 10 mpg through the mostly flat Texas countryside while grossing out around 66,000 pounds.It's not exactly breaking news that the new generation of truck driver is seeking a far different experience than the asphalt cowboys that came before them. Piloting a spring seat 700 miles per day and throwing through 18 speeds manually isn't the badge of honor at the truckstop lunch counter that it used to be. As such, most modern tractors have a very automotive fit, finish and feel. It's almost a cliche to point it out. But ... the new Model 579 has a very automotive fit, finish and feel.

The interior is plush, the 2.1 meter cab is spacious and comfortable and the accents and design touches are in line with something you'd find in a premium trim-level automobile.

Equipped with an MX-13 (455 hp and 1,650 ft-lb torque) and 12-speed Paccar automated manual transmission, my 579 EPIQ and I routinely were getting more than 10 mpg through the Texas countryside while grossing out around 66,000 pounds. At one point I was holding 10.5 mpg (helped by a 2.64 rear axle ratio), and I never once used adaptive cruise. 

Alas, I managed to drag that down below 10 mpg with the final mile trek back to the terminal. Such is the life of the American trucker: the fuel gods giveth and the fuel gods taketh away. 

I'm not a hyper-miler. I wasn't putting any effort into fuel economy. I was piloting a reasonably loaded truck – one with a 235-inch wheel base and an 80-inch UltraLoft sleeper – and I was still getting double digit miles per gallon. If there was ever a testimony that, "If I can do it, so can you," this is it.

The EPIQ package was born from Peterbilt’s involvement with the SuperTruck program, a government program that funded OEM and component research in technologies to boost commercial truck fuel economy, and that experience has translated perfectly to production models. 

The wheel well closeouts, ground skirts and tandem fairings that make the truck slippery do so without exposing it unnecessarily to curb and ground strikes. 

I know drivers often feel that there's a power-for-performance tradeoff when it comes to fuel efficiency, but that wasn't the case at all with the 579. The MX-13 had no trouble dragging the load, regardless of how the terrain changed. 

The new Model 579 doesn't make a lot of sacrifices in offering the kind of performance and amenities that drivers like and the efficiency and technology that the back office likes. It is, quite frankly, the perfect blend of old and new school. 

Sat, 23 Jul 2022 03:45:00 -0500 en-us text/html
Killexams : Biden tests positive for COVID-19, returns to isolation

WASHINGTON (AP) — President Joe Biden tested positive for COVID-19 again Saturday, slightly more than three days after he was cleared to exit coronavirus isolation, the White House said, in a rare case of “rebound” following treatment with an anti-viral drug.

White House physician Dr. Kevin O'Connor said in a letter that Biden “has experienced no reemergence of symptoms, and continues to feel quite well.” O'Connor said “there is no reason to reinitiate treatment at this time.”

In accordance with Centers for Disease Control and Prevention guidelines, Biden will reenter isolation for at least five days. He will isolate at the White House until he tests negative. The agency says most rebound cases remain mild and that severe disease during that period has not been reported.

Just as when Biden first tested positive, the White House sought to show he was still working. The president sent out a picture of himself masked and tieless on Twitter, which showed him signing a declaration that added individual assistance for flood survivors in Kentucky.

The president followed up by tweeting out a 12-second video of him on a White House balcony with his dog, Commander.

“I'm feeling fine, everything is good,” said Biden, a pair of aviator sunglasses in his hand. “But Commander and I got a little work to do.”

The president also took time on Saturday to have a FaceTime conversation with people camping outside the U.S. Capitol who are seeking health benefits for military veterans exposed to toxic substances from burn pits during their service, according to White House chief of staff Ron Klain. A bill to provide expanded benefits failed to clear the Senate on Wednesday. Veterans Affairs Secretary Denis McDonough brought the group pizza and the phone connection to talk with the president.

“Feel better,” a member of the group told Biden in a video of the call posted to Twitter. Later, in a tweet, the president said he had planned to meet with families at the Capitol but that his positive test “got in the way.”

Word of Biden’s positive test came — he had been negative Friday morning — just two hours after the White House announced a presidential visit to Michigan this coming Tuesday to highlight the passage of a bill to promote domestic high-tech manufacturing. Biden had also been scheduled to visit his home in Wilmington, Delaware, on Sunday morning, where first lady Jill Biden has been staying while the president was positive. Both trips have been canceled as Biden has returned to isolation.

Biden, 79, was treated with the anti-viral drug Paxlovid after he first tested positive on July 21. He tested negative for the virus on this past Tuesday and Wednesday. He was then cleared to leave isolation while wearing a mask indoors. His positive tests puts him among the minority of those prescribed the drug to experience a rebound case of the virus.

White House COVID-19 coordinator Dr. Ashish Jha told reporters on Monday that data "suggests that between 5 and 8 percent of people have rebound” after Paxlovid treatment.

“Acknowledging the potential for so-called ‘rebound’ COVID positivity observed in a small percentage of patients treated with Paxlovid, the President increased his tested cadence, to protect people around him and to assure early detection of any return of viral replication,” O'Connor wrote in his letter.

O'Connor cited negative tests for Biden from Tuesday evening, Wednesday morning, Thursday morning and Friday morning, before Saturday morning's positive result by antigen testing. “This in fact represents ‘rebound' positivity," he wrote.

According to the CDC, those with rebound COVID should isolate for at least five days, ending that if a fever has resolved itself for 24 hours without medication and symptoms have improved. The patient “should wear a mask for a total of 10 days after rebound symptoms started. Some people continue to test positive after day 10 but are considerably less likely to shed infectious virus.”

Both the Food and Drug Administration and Pfizer point out that 1% to 2% of people in Pfizer’s original study on Paxlovid saw their virus levels rebound after 10 days. The rate was about the same among people taking the drug or dummy pills, “so it is unclear at this point that this is related to drug treatment,” according to the FDA.

While Biden was testing negative, he returned to holding in-person indoor events and meetings with staff at the White House and was wearing a mask, in accordance with CDC guidelines. But the president removed his mask indoors when delivering remarks on Thursday and during a meeting with CEOs on the White House complex.

Asked why Biden appeared to be breaching CDC protocols, press secretary Karine Jean-Pierre said, “They were socially distanced. They were far enough apart. So we made it safe for them to be together, to be on that stage.”

Regulators are still studying the prevalence and virulence of rebound cases, but the CDC in May warned doctors that it has been reported to occur within two days to eight days after initially testing negative for the virus.

“Limited information currently available from case reports suggests that persons treated with Paxlovid who experience COVID-19 rebound have had mild illness; there are no reports of severe disease,” the agency said at the time.

When Biden was initially released from isolation on Wednesday, O’Connor said the president would “increase his testing cadence” to catch any potential rebound of the virus.

Paxlovid has been proven to significantly reduce severe disease and death among those most vulnerable to COVID-19. U.S. health officials have encouraged those who test positive to consult their doctors or pharmacists to see if they should be prescribed the treatment, despite the rebound risk.

Biden is fully vaccinated, after getting two doses of the Pfizer coronavirus vaccine shortly before taking office, a first booster shot in September and an additional dose March 30.

While patients who have recovered from earlier variants of COVID-19 have tended to have high levels of immunity to future reinfection for 90 days, Jha said that the BA.5 subvariant that infected Biden has proven to be more “immune-evasive.”

“We have seen lots of people get reinfected within 90 days,” he said, adding that officials don’t yet have data on how long those who have recovered from the BA.5 strain have protection from reinfection.

Sat, 30 Jul 2022 10:51:00 -0500 en-US text/html
Killexams : Your Own Engineering Workstation, With Mame

There are some things that leave indelible impressions in your memory. One of those things, for me, was a technical presentation in 1980 I attended — by calling in a lot of favors — a presentation by HP at what is now the Stennis Space Center. I was a student and it took a few phone calls to wrangle an invite but I wound up in a state-of-the-art conference room with a bunch of NASA engineers watching HP tell us about all their latest and greatest. Not that I could afford any of it, mind you. What really caught my imagination that day was the HP9845C, a color graphics computer with a roughly $40,000 price tag. That was twice the average US salary for 1980. Now, of course, you have a much better computer — or, rather, you probably have several much better computers including your phone. But if you want to relive those days, you can actually recreate the HP9845C’s 1980-vintage graphics glory using, of all things, a game emulator.

The Machine

The HP9845C with a Colorful Soft Key Display

Keep in mind that the IBM PC was nearly two years away at this point and, even then, wouldn’t hold a candle to the HP9845C. Like many machines of its era, it ran BASIC natively — in fact, it used special microcode to run BASIC programs relatively quickly on its 16-bit 5.7 MHz CPU. The 560 x 455 pixel graphics system had its own CPU and you could max it out with a decadent 1.5 MB of RAM. (But not, alas, for $40,000 which got you — I think –128K or so.)

The widespread use of the computer mouse was still in the future, so the HP had that wonderful light pen. Mass storage was also no problem — there was a 217 kB tape drive and while earlier models had a second drive and a thermal printer optional, these were included in the color “C” model. Like HP calculators, you could slot in different ROMs for different purposes. There were other options such as a digitizer and even floppy discs.

The machines had a brief life, being superseded quickly by better computers. However, the computer managed to play a key role in making the 1983 movie Wargames and the predecessor, the HP9845B appeared on screen in Raise the Titanic.

According to the HP Museum, the 9845C wasn’t terribly reliable. The tape drives are generally victims of age after 40+ years, but the power supplies and memory also have their share of issues. Luckily, we are going to simulate our HP9845C, so we won’t have to deal with any of those problems.

One other cool feature of just about every HP computer from that era was the soft key system. These were typically built into the monitor or, sometimes, the keyboard and lined up with labels on the screen. So instead of remembering that F2 is the search command (or whatever), there would be a little label on the screen over the button that said “Search.” Great stuff!


When you think about simulating an old computer, you probably think of SimH. However, the HP machines were very graphical in nature, so the author of the HP9845C emulator made a different choice: MAME. You normally think of MAME as a video game emulator. However, if you want color graphics, ROM slots, and a light pen, MAME is a pretty good choice.

As you can see, you get a view of the 9845C monitor replete with soft keys and, if you enable it, even a light pen. You can load different images as ROMs and tapes. The only tricky part is the keyboard. The HP has a custom keyboard that works a bit different than a PC keyboard.

In particular, the HP computers were typically screen-oriented. So the Enter key was usually distinct from the key that told the computer you were ready for it to process. This leads to some interesting keyboard mappings.

Quick Start Guide

In fact, the page that has the most information about the emulator is a little hard to wade through, so this might help. First, you want to scroll down to the bottom and get the prebuilt emulators for Linux or Windows. You can build with MAME or use the stock versions — assuming your stock version has all the right options. But it is easier to just grab the prebuilt and they can coexist with other versions of MAME; even if you want to go a different route eventually, you probably should still start there.

The emulator is called 45c and, on Linux, I had to make it executable myself (chmod +x). Here is a typical command line:

./45c -magt1 tapes/demo1.hti -magt2 tapes/demo2.hti -ramsize 192k '-rom1 advprog' '-rom5 colorgfx' '-rom3 massd' '-rom4 strucprog' &

All of those tape and ROM files are in the distribution archive. You probably don’t need any of the ROMs, but I loaded them anyway. Add -window if you prefer not to run full screen. If you do that, you may also want to add -nounevenstretch and -nomax options to Strengthen appearance.

If you want to try the lightpen, use the -lightgun -lightgun_device_mouse option to turn your mouse into a lightpen. Note this will grab your mouse and you may need to use Alt+Tab or some other method to switch away from the emulator.

The keyboard mappings are listed on the web page but here are a few that are handy to know:

  • Enter – Continue
  • Right Shift+Enter – Store
  • Numeric Enter (or Right Shift+Enter) – Execute
  • Escape – Stop
  • Right Shift+Home – Clear screen

So faced with the prompt, you can enter something like:


Then press the numeric enter key to see the result. So this being a BASIC computer, you can enter:


Right? Well, yes, but then you need to press store (Right Shift+Enter)

If you have the tapes loaded as above (you can view the tape catalog with the CAT command), try this:

load "autost"
High tech graphics for 1980

Remember to use the numeric pad enter key after each line, not the normal enter key!

The king of the demos is the Space Shuttle graphic which was cutting edge in 1980. You could change various display and plot options using the soft keys.


Of course, the Space Shuttle is only fun for so long. There are many other demos on the same tape, but eventually you’ll want to play with something more interesting. The HP Museum has a good bit of software you can probably figure out how to load. You can’t download the software, but if you want to see what the state of gaming was on a $70,000 HP9845B in those days, [Terry Burlison] has some recollections and screen shots. You’ll also find tons of documents and other information on the main HP9845 site.

It would be really interesting if the emulator could drive an HP-IB card in the PC or a PI to drive all your old boat anchor test equipment. That might even let you connect a hard drive. Maybe.

Thu, 28 Jul 2022 02:00:00 -0500 Al Williams en-US text/html
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