How the Königsberg bridge problem changed mathematics - Dan Van der Vieren

source: TED-Ed     2016年9月1日
View full lesson: http://ed.ted.com/lessons/how-the-kon...
You’d have a hard time finding the medieval city Königsberg on any modern maps, but one particular quirk in its geography has made it one of the most famous cities in mathematics. Dan Van der Vieren explains how grappling with Königsberg’s puzzling seven bridges led famous mathematician Leonhard Euler to invent a new field of mathematics.
Lesson by Dan Van der Vieren, animation by Artrake Studio.

Putnam's Critique of the Fact/Value Dichotomy

source: Philosophical Overdose    2016年7月31日
Professor Hilary Putnam gives a lecture titled "The fact/value dichotomy and its critics" at UCD in March 2007. The question "Is that supposed to be a fact or a value judgment?" is a familiar one that arises in everyday life. The presupposition seems to be that if something is a value judgment, then it cannot possibly be a statement of fact, and that value judgments are merely subjective. But is this right? Putnam attacks this dichotomy, arguing that we have no clear unproblematic notion of "fact", and that facts and values are essentially entangled with one another, even within science. He draws on the work of people like Quine with his attack on the analytic-synthetic distinction to help make his case. The fact-value dichotomy was crucial for the logical positivists and such emotivist approaches to ethics, making values and morals non-cognitive and outside the sphere of rationality altogether. Putnam argues that the dichotomy has also been culturally influential and has had an impact on society with various economic and social policies.
Hilary Putnam (1926-2016) was an American philosopher, mathematician, and computer scientist who was a central figure in analytic philosophy. He made important contributions in many areas, including logic, philosophy of mind, philosophy of language, epistemology, philosophy of science, and mathematics.
Putnam's "Reason, Truth, and History" is a great work and has a few chapters which deal with these issues on rationality and the fact-value dichotomy. The book can be found here: https://ia902606.us.archive.org/23/it...
http://www.ucd.ie/news/mar07/030507_P...

Arvind Pattamatta & Ajit K. Kolar: Convective Heat Transfer (IIT Madras)

# playlist of the 44 videos (click the up-left corner of the video)

source: nptelhrd     2014年7月16日
Mechanical - Convective Heat Transfer by Dr. Arvind Pattamatta & Prof. Ajit K. Kolar, Department of Mechanical Engineering, IIT Madras. For more details on NPTEL visit http://nptel.ac.in

01 Introduction to convective heat transfer - Part 1 51:51
02 Introduction to convective heat transfer - Part 2 58:20
03 Continuity Equation 41:40
04 Momentum and Energy Equations 49:51
05 Energy Equation 50:37
06 Reynolds Transport Theorem 51:05
07 Entrophy Generation and streamfunction-vorticity formulation 51:08
08 Couette flow - Part 1 54:47
09 Couette flow - Part 2 50:04
10 Couette flow - Part 3 50:35
11 Boundary layer approximation 50:59
12 Laminar External flow past flat plate (Blasius Similarity Solution) 48:31
13 Numerical solution to the Blasius equation and similarity solution to heat transfer 47:05
14 Pohlhausen similarity solution and flows including pressure gradient (Falkner-Skan) 48:21
15 Falkner skan solutions for heat transfer 46:20
16 Similarity solution for flow and heat transfer with transpiration at walls 49:31
17 Thermal boundary layer in high speed flows 50:23
18 Approximate(Integral) methods for laminar external flow and heat transfer 46:55
19 Integral method for laminar external thermal boundary layer over isothermal surface 46:59
20 Integral method for flows with pressure gradient (von Karman-Pohlhausen method) 51:08
21 Integral method with pressure gradient: heat transfer 44:57
22 Heat transfer across a circular cylinder: Walz approximation 35:50
23 Duhamel's method for varying surface temperature 48:05
24 Laminar External heat transfer with non uniform surface temperature 37:10
25 Laminar internal forced convection - fundamentals 39:52
26 Hydrodynamically and thermally fully developed internal laminar flows 50:06
27 Fully developed laminar internal flow and heat transfer 47:59
28 Shooting method for fully developed heat transfer and thermal entry length problem 49:51
29 Thermal entry length problem with plug velocity profile: Graetz problem 54:10
30 Extended Graetz problem for parabolic velocity profile 45:03
31 Extended Graetz problem 49:59
32 Extended Graetz problem with wall flux boundary condition 51:53
33 Approximate method for laminar internal flows 51:58
34 Integral method for thermal entry length problem 49:06
35 Introduction to Natural Convection Heat Transfer 46:51
36 Similarity Solution in Natural Convection for Vertical isothermal Plate - Part 1 47:19
37 Similarity Solution in Natural Convection for Vertical isothermal Plate - Part 2 47:29
38 Similarity Solution in Natural Convection for Vertical isoflux Plate 48:11
39 Approximate Method in Natural Convection Heat Transfer 46:38
40 Natural Convection in Other Configurations 50:24
41 Turbulent Convective Heat Transfer: RANS Equations - Part 1 49:44
42 Turbulent Convective Heat Transfer: RANS Equations - Part 2 52:09
43 Analogies in Turbulent Convective Heat Transfer - Part 1 50:22
44 Analogies in Turbulent Convective Heat Transfer - Part 1 45:46

M. R. Shenoy: Semiconductor Optoelectronics (IIT Delhi)

# playlist of the 46 videos (click the up-left corner of the video)

source: nptelhrd    2013年10月4日
Physics - Semiconductor Optoelectronics by Prof. M. R. Shenoy, Department of Physics, IIT Delhi. For more details on NPTEL visit http://nptel.iitm.ac.in

Mod-01 Lec-01 Context and Scope of the Course 52:27
Mod-01 Lec-02 Energy Bands in Solids 53:25
Mod-01 Lec-03 E-K Diagram 45:48
Mod-01 Lec-04 The Density of States 47:27
Mod-01 Lec-05 The Density of States (contd..) 47:50
Mod-01 Lec-06 The Density of states in a Quantum well Structure 50:52
Mod-01 Lec-07 Occupation Probability and Carrier Concentration 46:02
Mod-01 Lec-08 Carrier Concentration and Fermi Level 48:50
Mod-01 Lec-09 Quasi Fermi Levels 50:22
Mod-01 Lec-10 Semiconductor Materials 45:41
Mod-01 Lec-11 Semiconductor Hetrostructures-Lattice-Matched Layers 50:43
Mod-01 Lec-12 Strained -Layer Epitaxy and Quantum Well Structures 51:09
Mod-01 Lec-13 Bandgap Engineering 53:33
Mod-01 Lec-14 Hetrostructure p-n junctions 49:35
Mod-01 Lec-15 Schottky Junction and Ohmic Contacts 56:21
Mod-01 Lec-16 Fabrication of Heterostructure Devices 59:47
Mod-01 Lec-21 The Semiconductor (Laser) Amplifier 56:33
Mod-02 Lec-17 Interaction od Photons with Electrons and Holes in a Semiconductor 54:32
Mod-02 Lec-18 Optical Joint Density of States 50:26
Mod-02 Lec-19 Rates of Emission and Absorption 50:28
Mod-02 Lec-20 Amplication by Stimulated Emission 42:51
Mod-02 Lec-22 Absorption Spectrum of Semiconductor 55:14
Mod-02 Lec-23 Gain and Absorption Spectrum of Quantum Well Structures 49:59
Mod-02 Lec-24 Electro-absorption Modulator 51:45
Mod-01 Lec-25 Electro-absorption Modulator - II Device Configuration 55:01
Mod-01 Lec-26 Mid-Term Revision Question and Discussion 58:45
Mod-03 Lec-27 Part - III Semiconductor Light Sources 53:11
Mod-03 Lec-28 Light Emitting Diode-I Device Structure and Parameters 51:00
Mod-03 Lec-29 Light Emitting Diode-II Device Characteristics 42:07
Mod-03 Lec-30 Light Emitting Diode-III Output Characteristics 53:45
Mod-03 Lec-31 Light Emitting Diode-IV Modulation Bandwidth 52:20
Mod-03 Lec-32 Light Emitting Diode-V materials and Applications 56:22
Mod-03 Lec-33 Laser Basics 57:02
Mod-03 Lec-34 Semiconductor Laser - I Device Structure 54:16
Mod-03 Lec-35 Semiconductor Laser - II Output Characteristics 54:11
Mod-03 Lec-36 Semiconductor Laser - III Single Frequency Lasers 56:58
Mod-03 Lec-37 Vertical Cavity Surface Emitting Laser (VCSEL) 56:29
Mod-03 Lec-38 Quantum Well Laser 58:32
Mod-03 Lec-39 Practical Laser Diodes and Handling 55:33
Mod-04 Lec-40 General Characteristics of Photodetectors 53:04
Mod-04 Lec-41 Responsivity and Impulse Response 53:54
Mod-04 Lec-42 Photoconductors 56:20
Mod-04 Lec-43 Semiconductor Photo-Diodes 58:04
Mod-04 Lec-44 Semiconductor Photo-Diodes -II : APD 42:55
Mod-04 Lec-45 Other Photodectors 1:06:00
Mod-05 Lec-46 Photonic Integrated Circuits 50:02

丁肇中院士獲頒諾貝爾物理學獎40週年：我所經歷的實驗物理

source: 臺大科學教育發展中心     2016年7月14日
今年是丁肇中院士因發現新型粒子榮獲諾貝爾物理獎40週年，臺大科教中心特地與財團法人張昭鼎紀念基金會、中研院和中央大學，聯合邀請丁肇中院士，在7月3日於臺大給予一場科普演講。
● 講題：我所經歷的實驗物理
● 時間：2016/7/3(日) 14:30-16:30 （13:45開始報到）
● 地點：臺灣大學物理系國際會議廳
● 講師：中央研究院院士兼美國麻省理工學院教授 丁肇中

Technological Apocalypse with Jason Reza Jorjani

source: New Thinking Allowed    2016年8月22日
Jason Reza Jorjani is a philosopher and faculty member at the New Jersey Institute of Technology. He is author of Prometheus and Atlas.
Here he suggests that converging technologies are forcing humanity to reconsider what it means to be human. Biotechnology will enable us to significantly increase human intelligence from generation to generation. In the absence of global regulation, this development could lead to a caste system. In addition, we face the prospect of human cloning and the potential of mixing human genes with those of other species. The fields of artificial intelligence and robotics offer additional possibilities for the creation of bionic species. It may be that our technological advances are outpacing our ability to trust each other to wisely use the new powers that will become available.

New Thinking Allowed host, Jeffrey Mishlove, PhD, is author of The Roots of Consciousness, Psi Development Systems, and The PK Man. Between 1986 and 2002 he hosted and co-produced the original Thinking Allowed public television series. He is the recipient of the only doctoral diploma in "parapsychology" ever awarded by an accredited university (University of California, Berkeley, 1980). He is a past vice-president of the Association for Humanistic Psychology; and is the recipient of the Pathfinder Award from that Association for his contributions to the field of human consciousness exploration. He is also past-president of the non-profit Intuition Network, an organization dedicated to creating a world in which all people are encouraged to cultivate and apply their inner, intuitive abilities.
(Recorded on June 25, 2016)

Jordan Peterson Q&A: Disney Propaganda and Why Bashing Religion Doesn't Make You Smart

source: Jordan B Peterson     2016年7月21日
Donate to develop channel: bit.ly/1VhFPLb
Twitter: https://twitter.com/jordanbpeterson
Facebook: https://www.facebook.com/drjordanpete...
Dr. Peterson responds to viewers' questions live on July 21, 8:30pm Eastern/5:30pm Pacific.
Jordan B. Peterson is a University of Toronto Professor, clinical psychologist, and author of Maps of Meaning.
His two main fields of research are the psychology of belief, including religion, mythology and political ideology; and the assessment and improvement of personality, including the prediction of creativity and academic and industrial performance.
http://jordanbpeterson.com/
https://twitter.com/jordanbpeterson