beware the performance of string concatenation
Experimental study on the performance of a prism-shaped integrated collector-storage solar water heater
... from the solar radiation, the tank wall heats a thin vertical layer of water along the tank wall Part of this heat is then transferred by diffusion towards the core of the tank The water of the ... August and the theoretical results of [1] in June Figure 10 The time variation of solar radiation and stored energy of the present experimental study in August and the theoretical results of [1] ... difference of around 3% for the most of the day In both comparisons, the experimental study gives lower values for most hours of the day, which may be attributed to different kind of thermal losses...
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Indoor tests to investigate the effect of brine depth on the performance of solar still
... depth) The objective of this work is to investigate the effect of brine depth on the productivity and efficiency of solar still under laboratory conditions Table shows a summary of some of the studies ... that of greater thickness, but the productivity diminishes rapidly after turning the heaters off On the other hand, the still with the higher brine depth has a larger production during the period ... as nocturnal production in the outdoor tests) These values are the initial value of the production line in the figures This may be due to the large thermal capacity of water, which is directly...
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the importantce and effect of csr reporting on the performance of vietnam companies
... support the charities of the 14 companies‟ ranked bottom of the list less than 0.01% of the profits Looking at the other side of the coin, according to the research center on the management of Ashridge, ... indirectly, by the actions of the firm In the traditional view of the firm, the shareholders view, the shareholders or stockholders are the owners of the company, and the firm only addresses the needs ... out the survey, I also interviewed the director and chief accountant of the company on the CSR of the company The question is to play a close look at the financial situation of the company and the...
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Effect of Fund Size on the Performance of Mutual Funds Evidence from Iran pdf
... Along the lines of the previous researches, they reported the negative influence of fund size on manager performance While digging deeper towards the origin of these diseconomies of scale, the ... and performance Then, when the significance of the relationship or the error limit was tested to accept or reject the hypothesis, the value was far higher than the minimum limit of 5% Thus; the ... checked the determinants of mutual fund performance using four factor models for the funds from 19 countries The major finding of the study explained that size of the funds did matter and the performance...
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Measuring and modelling the performance of a parallel ODMG compliant object database server potx
... product of its inputs The experiments measure the effect of varying the selectivity of the scans on the inputs to the join as follows (1) Varying the selectivity of the outer collection (v1) The ... Cardinality of the left input Cardinality of the right input Length of the predicate Type of the object Number of objects Extent of the database (e.g AtomicParts) Number of pages Size of a bucket ... varied here is the selectivities of the scans of the collections being joined, not the join selectivity itself, which is ratio of the number of tuples returned by a join to the size of the Cartesian...
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Báo cáo khoa học: "Estimating Upper and Lower Bounds on the Performance of Word-Sense Disambiguation Programs" docx
... advantage of the prior probabilities of the senses, so they would be at a disadvantage relative to the baseline if one of the senses had a very high prior, as is the case for the test word issue 10 The ... when there is an unusual trade-off between the cost of a Type I error and the cost of a Type II error Nevertheless, the proposed baseline does seem to provide a usable rough estimate of the lower ... for the judges If the task is too hard (as Jorgensen's classification task may he), then there will be almost no room between the limits of the measurement and the baseline In other words, there...
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THE PERFORMANCE OF CREDIT RATING SYSTEMS IN THE ASSESSMENT OF COLLATERAL USED IN EUROSYSTEM MONETARY POLICY OPERATIONS pot
... to the quantiles of the standard normal distribution The quality of the approximation depends on the values of the parameters N Y,, the number of rated entities with the same rating grade at the ... distribution The mean of this distribution, the probability of default of the benchmark, is estimated at ˆ [0.0%, 0.1%] p (with an average of 0.04%) The other binomial parameter is the number of trials ... should therefore combine the variance of the ex-ante estimated probability of default of the rating source and that of the benchmark in one measure in order to conduct the backtesting The difference...
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Assessing the Performance of Public Schools in Pittsburgh docx
... on the PSSA It therefore has an ASA of 80 The school with the lowest level of student achievement across all tests has an average of 13% of its students achieving proficiency on the PSSA It therefore ... interpreted as measures of the performance of schools Achievement levels are a product not only of school performance, but also of a wide range of other forces that are outside the control of schools, including ... school performance This section describes the analyses RAND conducted with the aim of identifying the school’s contribution to student achievement, thereby measuring the performance of the school...
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Báo cáo khoa học: "Improving the Performance of the Random Walk Model for Answering Complex Questions" pptx
... cases where the query is composed of two or more sentences, we compute the similarity between the document sentence (s) and each of the query-sentences (qi ) then we take the average of the scores ... although the two STs of Figure share most of the subtrees rooted in the ST node, the kernel defined above computes no match The critical aspect of the TK function is that the productions of two evaluated ... v)) The denominators in both terms are for normalization C is the set of all sentences in the collection The value of the parameter d which we call “bias”, is a trade-off between two terms in the...
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Common factors in the performance of European corporate bonds – evidence before and after financial crisis pdf
... bonds and the one-month risk-free rate of the previous month The proxy of the default risk is the difference between the return of corporate 12 The Corporate Composite bond index and the Euro ... tested, K is the number of risk factors in the asset pricing model, µ is a column vector of mean returns of the risk factors, Ω is the unbiased estimate of the covariance matrix of the risk factors ... due to the high degree of excess kurtosis in the majority of 11 time-series, the Jarque-Bera test rejects the null hypothesis of a normal distribution for five out of seven risk factors The correlation...
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THE PERFORMANCE OF SOCIALLY RESPONSIBLE INVESTMENT FUNDS: A META ANALYSIS doc
... the sign of the coefficient is in accordance with the results of the binary logit model but not as expected by H3 negative and significant A lower probability of an outperformance of 17 The Performance ... countries, as they have the largest share of the global SRI market (Eurosif, 2010) The results of primary studies are sensitive to the time period of an effect as well but based on the results of the binary ... the attrition rate of conventional funds is higher than the attrition rate of SRI funds (and therefore, the average performance of conventional funds is biased more upwards than the average performance...
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The Performance of Socially Responsible Mutual Funds: The Role of Fees and Management Companies ∗ pot
... funds in the period 1994-2003 using the same measure of performance Neither of these studies documents statistically significant differences in performance Both the approach and the results of our ... of Statman (2000) and Bauer et al (2005) Statman (2000) compares the performance of a sample of SRI funds with that of a control group of conventional funds of similar size and reports that the ... companies, out of a sample of thousands of US companies Therefore, at least part of our sample of SRI mutual funds may face only minor restrictions on their investment policies The fraction of “sin”...
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HORIZONTAL EVALUATION OF THE PERFORMANCE OF NETWORK INDUSTRIES PROVIDING SERVICES OF GENERAL ECONOMIC INTEREST pot
... documents, the evaluation report follows the logic established in article 16 of the Treaty: first an assessment of the evolution of the legislative framework and of the market performance of services of ... The Commission is already working to fill in these gaps in future reports However, the cooperation of all actors involved in the EU-wide process of evaluation of the performance of services of ... competition for urban transport They see a risk of confusion, for example, as regards the pricing system or the organisation of the network Therefore, they expect the activities of the various operators...
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Báo cáo hóa học: " Assessment of Joystick control during the performance of powered wheelchair driving tasks" ppt
... half of the time of the minimal duration of a joystick movement (200 ms) The mean direction was calculated within each of these time bins We then computed the intra-trial mean and variability of ... single standard deviation of the vector scatter plotted on the joystick, while the v marks the value of the mean well to the mid-wheelchair All of the novice participants used the lowest speed, yet ... one side of the PW placed adjacent to a wall They then executed a series of maneuvers in an attempt to place the opposite side of the PW to the opposite wall (see Figure 1D-E) As in the 180°...
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Báo cáo hóa học: " Impact of the environment and the topology on the performance of hierarchical body area networks" ppt
... the impact of these parameters is not the focus of the this study, the interested reader is referred to the existing literature [27-29] for further details The principal contributions of this article ... where, in the last passage, we have used the fact that the RVs {Λi, Λj, Penv, Xi} are independent The term in the third line of the expression at the right-hand side of (13) can be further expressed ... the type of physiological constant and the congestion at the relays, among others This analysis goes beyond the scope of this article and is the subject of future research However, whatever the...
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Báo cáo hóa học: " Effect of triplet multiple quantum well structures on the performance of blue phosphorescent organic light emitting diodes" potx
... the inset of Figure shows current density versus voltage characteristics of devices A, B, C, and D The dotted circle on the graph of Figure shows reduction in the turn-on voltage from 3.5 V of ... voltage characteristics) of devices A, B, C, and D The dotted circle on the graph shows reduction in the turn-on voltage from 3.5 V of the reference device (device A) to 2.5 V of the MQW structure device ... depends on the properties of the organic material in the devices [3, 4] In particular, the energy level of the charge transport, host, and emitter materials influences the light-emitting efficiency...
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báo cáo hóa học: " TCP NCE: A unified solution for non-congestion events to improve the performance of TCP over wireless networks" docx
... differentiate the random losses from congestion losses by adopting the mechanism of TCP Vegas [13] to estimate the size of the backlogged packets (N) in the buffer of the bottleneck link The calculation of ... n-1 the arrival time of the previous ack, and tn the arrival time of nth packet at the receiver The sender interprets the estimated rate as the optimal congestion window (ownd) in unit of the ... sender sets the size of cwnd to the value of ssthresh Figure 12 Behaviour of TCP NCE Page 11 of 20 and then goes to CA phase On the other hand, if the current queue length is less than the threshold...
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