200 puzzling problems in physics

...   !"# Đ bi tp trong sch 200 Puzzling Problems in Physics Bi 82:$%!&!' ())*!+ %!,-%.//01!2 !3!&!'...

Ngày tải lên: 19/01/2014, 10:20

Ngày tải lên: 08/04/2014, 12:26

Ngày tải lên: 17/03/2014, 14:30

Ngày tải lên: 29/06/2014, 09:21

Ngày tải lên: 04/10/2012, 10:24

Ngày tải lên: 07/09/2013, 13:06

Ngày tải lên: 19/12/2013, 14:05

... assuming that there is no spatial aliasing due to insufficiently spaced sensors. In general, as the angle increases, so does the spatial frequency. It can alsobe deduced thatretaining signals having ... signal. Thisresultsina beamforming algorithmthat will concentrateonmaintaining abeamdirectedtowards the target signal, as opposed to, or in addition to, positioning the nulls as in the case of the ... The constraint for the desired frequency response in the look direction can also be implemented in a similar fashion to that of the narrowband array in Eq. (30.23). Instead of constraining the sum...

Ngày tải lên: 25/12/2013, 06:16

... LLC InverseProblemsinMicrophone Arrays A.C.Surendran BellLaboratories LucentTechnologies 32.1Introduction:DereverberationUsingMicrophoneArrays 32.2SimpleDelay-and-SumBeamformers ABriefLookatAdaptiveArrays • ConstrainedAdaptiveBeam- formingFormulatedasanInverseProblem • MultipleBeam- forming 32.3MatchedFiltering 32.4DiophantineInverseFilteringUsingtheMultiple Input-Output(MINT)Model 32.5Results SpeakerIdentification 32.6Summary References 32.1 ... we shall discuss single and multiple beamforming, matched filtering, and Diophantine inverse filtering through multiple input-output (MINT) modeling. In all cases we assume that the source location ... selectivity in a spatial volume and thus immunity from interfering noise sources. An exact inverse using Diophantine inverse filtering using the MINT model can be found. Though this method provides...

Ngày tải lên: 25/12/2013, 06:16

... 45. The main program is  integi.cc 45  ≡ 45 #include <fstream> #include "vnode.h" using namespace std; using namespace vnodelp;  Lorenz 19  int main ( ) {  set interval initial ... ry LDFLAGS linker flags I PACKAGE FILIB VNODE or PROFIL VNODE I INCLUDE name of the directory containing include files of the interval-arithmetic package I LIBDIR name of the directory containing interval ... out- put. Since VNODE-LP includes all possible errors in its computation, including conversion errors in the input from decimal to binary, we have bounds on the true solution at t = 20. Using these...

Ngày tải lên: 12/01/2014, 22:07

... successfully making two free-throws in a row in basketball (2) the probability that it will rain in London tomorrow and the probability that it will rain on the same day in a certain city in a distant ... instance, a bowler might have a 30% chance of getting a strike (knocking down all ten pins) and a 20% chance of knocking down nine of them. The bowler’s chance of knocking down either nine pins ... Figure m shows convincing evidence for time dilation in the brightening and dimming of two distant supernovae. The twin paradox A natural source of confusion in understanding the time-dilation effect...

Ngày tải lên: 19/01/2014, 14:32

... (people in business, talking about your company, and company facts and figures), preparing a trip (choosing a hotel, flying out, arriving) , away on business (finding your way, going out, and eating ... activities of listening, speaking, reading, and writing. - It is very interesting that when working with this book, students are given chances to practise English in actual situations in the form of ... This kind of test has much to do with vocabulary, and includes 4 parts presented in the following order: Gap-filling (10 points), word forms (10 points), reading comprehension (10 points),...

Ngày tải lên: 29/01/2014, 00:23

... measures” to urinate • Dehydration (not drinking fluids to prevent urination) 2. Vaginal symptoms: Itching, burning, pain, & discharge 3. Menstrual complaints: Pain, heavy bleeding, missed ... Does providing women with information on feminine hygiene and menstrual self-care practices lead to a decrease in genitourinary complaints during deployment? • Specific Aims  To increase knowledge ... Women in the Military Pre-deployment Intervention • 30 min class on feminine self- care, and prevention of UTI, vaginitis & menstrual vaginitis , & menstrual symptoms • Feminine Hygiene...

Ngày tải lên: 13/02/2014, 07:20

... a F τ i iy F τ i+1 iy k i−1 k i k i+1 Figure 1.1: A string with mass points attached to springs. 1.1 The String We consider a massless string with equidistant mass points attached. In the case of a string, we shall see (in chapter 3) ... string at some point in time. 1.4 Special Cases This material was originally in chapter 3 8 Jan p3.3 We now consider two singular boundary conditions and a boundary pr:sbc1 condition leading ... CONTENTS 6.7 Semi -In nite String with Fixed End . . . . . . . . . . . . 97 6.8 Semi -In nite String with Free End . . . . . . . . . . . . 97 6.9 Elastically Bound Semi -In nite String . . . . . ....

Ngày tải lên: 05/03/2014, 11:21

... reasoning in physics) , pp. 169–170. Cambridge: Cambridge University Press, 2nd edn, 2003 . Solved Problems in Classical Mechanics incorporated in the universal constant G, which is already present in ... there is an uncertainty ∆v 0 in the initial velocity v 0 . Determine the corresponding uncertainty ∆x in the position of the particle after a time t. Solution In between the instants of reflection, ... walls: determinism has changed into complete indeterminism. (iii) It is only in the ideal (and unattainable) case ∆v 0 =0(i.e. the initial velocity is known exactly) that deterministic motion persists indefinitely. (iv)...

Ngày tải lên: 05/03/2014, 13:20

... grouping, Haemoglobin Estimation, ESR, urine screening for sugar and albuminurea, urine routine examination, screenings for Hepatitis-B, Hepatitis-C and HIV/AIDS. I had some savings from my clinic's ... least in 30% of those attending the clinic? The activity was initiated formally on 01-05 -2000 . All pregnant women attending our clinic were informed about the presence of Antenatal centers in ... data, in a very crowded free camp held in my clinic on the second Sunday of July, 2000 . The main problems were: 1) Vaginal discharge 2) Unwanted pregnancies in married women 3) Breast Problems...

Ngày tải lên: 05/03/2014, 15:20

... taken into cognisance the findings of most of the surveys wherein X-ray was the initial screening tool. They had chosen to ignore the findings of surveys, wherein the initial screening was ... IndJ Tub, 2000 ,47, 184 2. Chakraborty AK, TB situation in India: measuring it through time, IndJ. Tub, 1993,40,215 3. Editorial, On estimation of burden of TB in India, Ind J. Tub, 2000 , ... consider in estimating the radiologically active disease. Instead of investigating only two sputum samples from X-ray abnormals, eight samples were examined in a study by the NTI, in order...

Ngày tải lên: 06/03/2014, 04:20

... (S 3 in left- sided HF and S 4 in patients with in- creased resistance to ventricular filling), pulmonary crackles, wheezing, pleural effusion, and pitting edema. 6. Initial testing should include ... Chest x-ray findings of HF may be obscured or distorted if there is underlying lung disease, and findings may be absent in patients with chronic HF. 23 lung disease in patients presenting to the ... combination regimen fails, continuous IV furosemide can be infused at a rate of 0.5 to 30 mg/hr. A loading dose of 200 mg IV furosemide should be given upon initiation of the continuous infusion. To...

Ngày tải lên: 06/03/2014, 12:20

... side. In the case of the isolated points, if the surface integral or line integral round this added boundary vanish, we can of course cease to consider these points as singular. Suppose Q becomes in nite ... finite, the added line integral will be zero or finite respectively (of course including in the term finite a possibility of zero value). If this expression be in nite, the added line integral will ... it justice.] ∗ [Note added, 1892. In the original essay there was a slip here which I have corrected. It was caused by assuming that ψ instead of ψ − 1 was small for small strains. In the original I said “where...

Ngày tải lên: 06/03/2014, 13:20

... peering,” in Proceedings of the 19th ACM Symposium on Operat- ing Systems Principles, October 2003 . [10] S. Grinstein, J. Huth, and J. Schopf, “Resource predic- tors in hep applications,” in Proc. ... allocation in federated distributed computing infrastructures,” in Proceedings of the 1st Workshop on Operating System and Architectural Support for the On- demand IT InfraStructure, October 2004 . [7] ... been made in the theory of solving large-scale mixed-integer optimization problems, which is an underlying technol- ogy well-suited to implementing market problems. This theory is now reflected in off-the-shelf...

Ngày tải lên: 07/03/2014, 17:20