Flick a switch and get instant power—how our ancestors would have loved electric motors! You can find them in everything from electric trains to

remote-controlled cars—and you might be surprised how common they are. How many electric motors are there in the room with

you right now? There are probably two in your computer for starters, one spi…[Leggi tutto]

The current coronavirus 2019 disease (COVID-19) pandemic has greatly changed our perspective of the risk for infection

from contact, and the use of personal protective devices (PPDs) usually reserved for health care workers (HCWs) has spread to

the general population, sometimes indiscriminately. As a result, medical glove stock has been…[Leggi tutto]

Pfizer has redesigned the synthesis of several of its pharmaceutical products to reduce generation of hazardous waste.

Changes were made in the synthetic route to sildenafil citrate (see Fig. 9.7), the active ingredient in Viagra® (Dunn et al.,

2004), which resulted in a more efficient process that required no extraction and recovery system…[Leggi tutto]

On the paper machine, the size press is

used to apply surface size to dried paper.182,183 Starch is the most frequently used binder in surface sizing. Besides

raising surface strength, starch also imparts stiffness, lowers water sensitivity, reduces dimensional changes and raises air

leak density of the sheet. In conventional practice, the…[Leggi tutto]

Musical instrument-making would be unthinkable without welded pipe ＆ tube. The tuba illustrates the connection particularly well: the name of this brass

instrument is nothing other than the Latin word for tube. Other brass and pipe instruments also take the tube form. The reed

used in a variety of wind instruments such as the clarinet, s…[Leggi tutto]

A visit to a kitchen showroom nowadays will show you a dazzling array of quartz countertop designs and patterns that

remarkably mimic real marble and other natural stone. But quartz has come a long way! First appearing in Italy in the 1960s,

these countertops were developed—by combining ground quartz particles with resins into a slab—as an alt…[Leggi tutto]

You may have noticed that, while you are on the road, you're quickly running out of juice. If you have this problem,

portable batteries and PD fast charger than what may

have come in the box with your device may be the solution.

If you're simply looking for everyday comfort, the best gaming seats may seem over the top. With wannabe-racer bucket

seats, and gaming chairs covered in satanic

runes running rampant, we've made sure to include a few sleek office-style chairs in here too. Whichever route you go

down, keep your posture in mind. Posture may be the last thing…[Leggi tutto]

One general disadvantage that all heat preservation gear pump share over some other positive-displacement pump styles – vane pumps, for

instance – is their inability to provide a variable flow rate at a given input speed. Where this is a requirement, a work-

around is to use drives capable of speed control, though this is not always a pra…[Leggi tutto]

The composition of chlorophyll-precursor pigments, particularly the contents of diethylene glycol divinyl ether, in etiolated tissues of higher plants

were determined by polyethylene-column HPLC (Y. Shioi, S. I. Beale [1987] Anal Biochem 162: 493-499), which enables the

complete separation of these pigments. DV-Pchlide was ubiquitous in…[Leggi tutto]

Alejandro Gallego López, the OI’s field director in Afghanistan, explained the process of restoring the white marble buddha statue.

First is to assess the collection—identifying and classifying features, such as archaeological motifs, and visible parts of

bodies, like legs, heads or arms. This census can help them estimate how many obje…[Leggi tutto]

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