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Englibrary, http //www.library.drexel.edu/blogs/englibrary/ (accessed October 13, 2010). Based at the Drexel University Libraries, this blog is a mix of engineering information news and research guides for engineering topics. [Pg.29]

Technorati, http //technorati.com/ (accessed October 13,2010). This site provides ranking and searching of blogs and blog posts, currently listing over one million blogs. [Pg.29]

The blog, or web log, has rapidly risen to a position of great importance in news and other forms of media. However, it has been relatively more slowly introdnced into science in general. There are no quality controls in the blog medium however, some gems are to be found. Some of the more well-known generalist sites are given in Table 13.1. [Pg.256]

There is a hyperblog site athttp //wiki.cubic.uni-koeln. de/pg. This site, among other topics, features a section on popular stories and areas of common interest. There is a section dealing with blogs on various aspects of chemistry from analytical to chemometrics/bioinformatics to pharmacology and genetic modification. [Pg.256]

In addition. Table 13.2 shows the sites with specialization on medicinal and pharmaceutical chemistry. [Pg.256]

Chemical blogspace collects data from tens of scientific chemistry blogs and presents it in one place. [Pg.256]

Authored by Michelle FrancI, Professoral Bryn MawrCollege. [Pg.256]

The force field ec uations for M.Vf+, AMBER, BlOg and OPES are similar in the types of terms they contain bond, angle, dihedral, van der Waals. and electrostatic. There are som e differences m the form s of the etinations that can al fect your ch oice of force field. [Pg.101]

What happened to Jonathan Leo next was reported in the Wall Street Journal s online Health Blog. JAMA editors phoned Leo and the Dean of his institution. According to Leo, the deputy editor of JAMA asked him, Who do you think you are , and then said,... [Pg.179]

Armstrong, David, Jama Editor Calls Critic a Nobody and a Nothing , in Wall Street Journal Health Blog, 2009 Aronson, Jeff, When I Use a Word. .. Please, Please Me , British Medical Journal 318 (1999) 716... [Pg.194]

Mankiw G. The Pigou Club Manifesto. Available from http //gregmankiw.blog-spot.it/2006/10/pigou-club-manifesto.html [Accessed 2015-10-10]. [Pg.39]

Blog Entry 2 At 250mA, your lamp is unlikely to be solid-state. Incandescent lamps may draw considerably more current than you think at startup, if the element temperature is not at thermal equilibrium. Though one Hertz is fairly fast for thermal effects, it is worth keeping an eye on. [Pg.268]

Blog Entry 1 Sorry it took so long to get back to you. I wanted to look at the question in Problem 1 below in more detail. First I ll answer the question in Problem 2 since that one is more obvious. [Pg.269]

Blog Entry 1 There are two ways to reduce the output ripple in Boost regulation ... [Pg.272]

Looking at the blog entry that follows, this one is technically correct if rather peremptorily explained. Hysteretic controllers are actually quite simple. In Chapter 2 we discussed the leverage factor of a voltage divider. In this case the reference is 1.24V and Vom is 3.8V. So the leverage factor is 3.8/1.24 = 3.0645. So... [Pg.273]

Blog Entry 2 I m using the 2622 per Figure 3 of the datasheet. How do I calculate the average and peak inductor currents ... [Pg.275]

Blog Entry 3 Attached is a file that provides the calculation rationale for the inductor in a Boost regulator design. [Pg.275]

The second blog entry is from a senior defense engineer in South Africa. My impression is that he or she has very aptly expressed a lot of the finer aspects of selecting aluminum electrolytic capacitors. I suggest you read that very closely. It s folks like these (no hidden agendas, just helpfulness) that make it worthwhile. [Pg.280]

Blog Entry 1 I thought a little harder on how zeners work, and realized that placing the zeners between the Vin rails will cause the zeners to melt if >12V was constantly supplied with a large Vin source, since Vin is not current regulated. Please don t flame [blame] me for the zener question I would still like to know how the Boost converter would react to overvoltaging. Perhaps that can answer whether zener diodes can even be used. [Pg.281]

Blog Entry 3 A more simple solution to implement is to use the 3478 Low-side N-channel controller in a SEPIC configuration. This application utilizes two inductors (instead of a Flyback transformer) to attain the Buck-Boost function. The 3478 requires an external user-selectable Fet switch, so you can choose the one that suits your load current requirement. The datasheet provides an application rationale for SEPIC configuration on page 19, Figure 13. The output voltage can be set to 12V by changing the value of the feedback resistor. [Pg.281]

Blog Entry 4 The best way to do this is to put in a low dropout linear regulator on the output. Set the Boost regulator output for 12.5-12.7V, and then use an LDO to drop your voltage to 12 V. [Pg.281]

Blog Entry 2 You are right. I did not have any answer to my problem of load transient while using 267xT-Adj device—until I saw this reply. Because I simply followed your software tool, which has no mention about Cinx. But after introducing Cinx the output is stable under all load conditions. Thanks. [Pg.286]

Blog Entry 2 Thanks for your reply. I tried placing the components in every possible way. But try and try, I just can t make Cl, C2, Pin 1, and GND all close together, along with the diode also close to pin 8.1 [just] can t do it. So please send me a demo PCB picture. Thanks. [Pg.287]

Blog Entry 3 Attached is the schematic of the 2621 design you requested, including the list of recommended parts to build it. I ll try to send you the recommended layout of the printed circuit board under a separate response as soon as I find out how to do it. [Pg.287]

Blog Entry 1 See the attached hie for the answer to your request. [Pg.295]

Blog Entry 1 It s probably not a good idea to set the current limit to infinity (shorting Pin 5 to GND), because the 2679 will not be protected from short-circuit condition. Hence it... [Pg.297]

Blog Entry 2 What inductor are you using You could in fact be in current limit by using too low an inductor value, or saturating the inductor. I would measure your inductor current and make sure peaks are <5.75A. Maybe check the design on virtual bench too. After all you re trying to deliver >125W. [Pg.298]

Author s Comments Judging by previous datasheet revision dates and various other blogs, the company actually knew about the D > 0.5 problem of their 267x family since early 2003. But three years later, their officials on the forum seem to imply they still don t know what this customer may be talking about here. The customer has said the duty cycle of the application is greater than 75% and also that the 2679 limits the duty cycle, and that the output voltage drops to 16V. Apparently that level of detail is just not enough for the company official ... [Pg.298]

Blog Entry 1 Please tell us the rest of the story. What is the input voltage range What load current is used in the circuit design I need this data to verify the parts you listed. I noted that the part number of the inductor indicates that it is a 33uH part, not 22uH as you... [Pg.300]

Blog Entry 3 The capacitor s ripple current is rated at 950mA at 100kHz, which falls within our application spec, I believe. Its impedance at 100kHz is given as 0.0560hms. [Pg.302]

Blog Entry 4 The maximum current drawn from the supply with a 1.0A load current is about 1.2A. You mentioned that the input source is drawn from a 15V battery. Did you verify if the battery is adequately sized for this operational condition Does the input voltage stay fixed at 15 V when the 1.0A load is applied ... [Pg.302]

Blog Entry 5 I have just tested the battery and it maintains its voltage when the circuit has a 3A load. The battery itself is rated for many more amps than that. [Pg.302]

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