Going with the Flow Measuring local blood flow inside living creatures provides insight into both normal functions and diseases. Ultrasound can probe deep within tissues by using the Doppler shift of the sound waves’ frequency to detect the motion of blood cells. But this effect is unmeasurable for blood moving slower than about ten millimeters per second. To track the motion of the tagged blood, the researchers exploited the photoacoustic effect, in which absorption of an infrared light pulse locally expands a material, generating sound waves. Unlike ultrasound, the near-infrared light interacts more strongly with blood than with tissue, but can’t be focused deeper than a millimeter.
The Write Practice | Practical Inspiration Breathingearth - CO2, birth & death rates by country, simulated real-time icists 'uncollapse' a partially collapsed qubit (Phys.org) —One of the striking features of a qubit is that, unlike a classical bit, it can be in two states at the same time. That is, until a measurement is made on the qubit, causing it to collapse into a single state. This measurement process and the resulting collapse may at first seem irreversible. (Once you open the box to find a dead cat, there's no going back, right?) But recently physicists have been investigating the possibility of "uncollapsing," or recovering the state of, a qubit that has been partially collapsed due to a weak measurement. In a new paper published in Physical Review Letters, physicists J. As the physicists explain, a full collapse of a qubit results from a measurement that reveals the qubit's state, while a partial collapse results from a measurement that can be thought of as a "peek" at the qubit because it doesn't reveal the qubit's state, but simply verifies that the qubit hasn't decayed. However, the recovery method is not perfect.
the free encyclopedia cambridgeinstruments.com Speed reading History[edit] Psychologists and educational specialists working on visual acuity used a tachistoscope to conclude[1] that, with training, an average person could identify minute images flashed on the screen for only one five-hundredth of a second (2 ms). Though the images used were of airplanes, the results had implications for reading.[citation needed] Methods[edit] Skimming[edit] Another form of skimming is commonly employed by readers on the Internet. [edit] Meta guiding is the visual guiding of the eye using a finger or pointer, such as a pen, in order for the eye to move faster along the length of a passage of text. Commercial speed reading programs[edit] Speed reading programs are available through courses, both in person or software based, and manuals. One point of difference between the various speed reading courses is the assertions concerning subvocalization. Speed reading courses and books take a variety of approaches to the concept of reading comprehension. Legentas[edit] U.S.
Physicists Explain "Gravity-Defying" Chain Trick Leaping up out of a jar in an arc before falling to the floor, the fountain-like motion of a chain of beads has puzzled millions around the world with its apparently gravity-defying behavior. Now physicists think they have an explanation. And it is far from intuitive. British science presenter Steve Mould, who made the experiment famous with a video that went viral on the Internet, explained the phenomenon as simply one of inertia: the falling chain has downward momentum, causing an upward momentum in beads leaving the pot. This, in turn, makes them leap before gravity can slowly reverse their momentum. Mould’s explanation was clever, but wrong, says physicist John Biggins of the University of Cambridge, UK. The only way to account for the rise is for the chain to receive a kick from the pot from which it is being pulled, say Biggins and his Cambridge colleague Mark Warner. Picking up a rod from the pot with an upward force on one of its ends causes two things to happen, says Biggins.
Philosophy Philosophy is the study of general and fundamental problems, such as those connected with reality, existence, knowledge, values, reason, mind, and language.[1][2] Philosophy is distinguished from other ways of addressing such problems by its critical, generally systematic approach and its reliance on rational argument.[3] In more casual speech, by extension, "philosophy" can refer to "the most basic beliefs, concepts, and attitudes of an individual or group".[4] The word "philosophy" comes from the Ancient Greek φιλοσοφία (philosophia), which literally means "love of wisdom".[5][6][7] The introduction of the terms "philosopher" and "philosophy" has been ascribed to the Greek thinker Pythagoras.[8] Areas of inquiry Philosophy is divided into many sub-fields. Epistemology Epistemology is concerned with the nature and scope of knowledge,[11] such as the relationships between truth, belief, and theories of justification. Rationalism is the emphasis on reasoning as a source of knowledge. Logic
The Physics of Energy | Physics Psychology Psychology is an academic and applied discipline that involves the scientific study of mental functions and behaviors.[1][2] Psychology has the immediate goal of understanding individuals and groups by both establishing general principles and researching specific cases,[3][4] and by many accounts it ultimately aims to benefit society.[5][6] In this field, a professional practitioner or researcher is called a psychologist and can be classified as a social, behavioral, or cognitive scientist. Psychologists attempt to understand the role of mental functions in individual and social behavior, while also exploring the physiological and biological processes that underlie cognitive functions and behaviors. While psychological knowledge is often applied to the assessment and treatment of mental health problems, it is also directed towards understanding and solving problems in many different spheres of human activity. Etymology History Structuralism Functionalism Psychoanalysis Behaviorism Humanistic