铁路旁的一条平行小路上，有一行人与一骑车人同时向南行进，行人速度为3.6千米/小时，骑车人速度为10.8千米/小时。这时，有一列火车从他们背后开过来，火车通过行人用22秒钟，通过骑车人用26秒钟。这列火车的车身总长是多少米？（）
Physics-informed neural networks building blocks. PINNs are made up of differential equation residual (loss) terms, as well as initial and boundary conditions. The network’s inputs (variables) are transformed into network outputs (the field\(\varvec{}{u}\)). The network is defined by\(\th...
Some mean-field approximation methods are considered, with the objective to transfer any arbitrary local plasticity constitutive description to an overall ... JL Chaboche,P Kanouté,A Roos - 《International Journal of Plasticity》 被引量: 130发表: 2005年 A second-moment incremental formulation for ...
When the two independent groups for comparison are assumed to have unequal variances, the effect size of the independent-sample analysis is measured by the mean difference. For more information, see PARAMETERS Subcommand (POWER MEANS INDEPENDENT command). POWER MEANS ONESAMPLE The new PRECISION ...
We interpret the root mean square error of approximation (RMSEA) because of its sensitivity to model misspecification, model quality and its capacity to produce confidence intervals, which allow the researcher to assess the precision of the estimates produced (Byrne, 2016). Recommended RMSEA values ...
In the case when is something like the truncated von Mangoldt function , the quantity is of size rather than . This costs us a logarithmic factor in the above analysis, however we can still conclude that we have the approximation (4) whenever is another sequence with such that one has the...
Being non-commutative, the quaternions do not form a field. However, they are still a skew field (or division ring): multiplication is associative, and every non-zero quaternion has a unique multiplicative inverse. Like the complex numbers, the quaternions have a conjugation although this is...
Proposition 1 (Elgindi’s approximation) Under the above hypotheses (and assuing suitable regularity and decay), we have the pointwise bounds for any , where is the vector field (5), and is the scalar function Thus under the hypotheses (i), (ii), and assuming that is slowly varying,...
Preservice teachers’ task utility was assessed using four items (Wigfield, 1994) on a five-point Likert-type scale (1 = not true at all to 4 = very true for me;α at t0 = .89; example item: “I think it is important to be able to solve this task.”). Task expectation was as...
A common approximation is thecurrent market value.In the United States, this is measured in terms of U.S. dollars and added together to produce aggregate measures of output, including GDP. There arealternatives to GDP. For example, The World Bank uses gross national income per capita, which ...