Optimization of Design Procedure for Column-base Connections according to EN 1993-1-8:2006

The stiffness and the strength of a column-base connection have significant impacts on the behavior of a steel frame. The paper develops an interaction curve between moment and axial force for the column-base connections according to EN 1993-1-8:2006 with the variation of the base plate thickness and the bolt diameter. This is the fundamental base to determine the ultimate strength of a column-base plate that allows the designers to estimate the strength of column-base connections. This research investigates the relationship between the base plate thickness, the bolt diameter, and the moment strength of the column-base plate with a specific axial force to select an optimum solution. Also, the initial rotational stiffness is determined under a specific axial load and varied moments that satisfy the ultimate limit state. The relationship between moment–rotation is subsequently performed with the variation of the base plate thickness or the bolt diameter. The design procedure is proposed based on moment-axial force interaction curves and moment-rotation curves. This allows for optimizing the column-base connection from proper selections of base plate dimensions and bolt diameters

Research on Digital Marketing for Play Nutrition's Nutrition Bar

In the 4.0 context, Digital Marketing becomes suitable for all businesses, from small to medium to large, helping businesses reduce costs, increase the effectiveness of communication tools, and align with today's digital transformation context. The study examines the degree of application of Digital Marketing tools for the Play Nutrition bar. The results show that “Content Marketing” has the highest frequency of appearance, attractiveness, and influence. Along with “Content Marketing”, “Video Marketing” also has the strongest impact. Based on the theoretical study of Digital Marketing, combined with survey results and orientation toward the use of Digital Marketing tools in the future for Play Nutrition bars, the research team proposes some recommendations to enhance the effectiveness of using Digital Marketing tools for Play Nutrition bars

An optimal Hardy-Littlewood-Sobolev inequality on Rn−k×Rn\mathbf R^{n-k} \times \mathbf R^n and its consequences

For $n > k \geq 0$, $\lambda >0$, and $p, r>1$, we establish the following optimal Hardy-Littlewood-Sobolev inequality $$\Big| \iint_{\mathbf R^n \times \mathbf R^{n-k}} \frac{f(x) g(y)}{ |x-y|^\lambda |y''|^\beta} dx dy \Big| \lesssim \| f \| _{L^p(\mathbf R^{n-k})} \| g\| _{L^r(\mathbf R^n)}$$ with $y = (y', y'') \in \mathbf R^{n-k} \times \mathbf R^k$ under the two conditions $$\beta < \left\{ \begin{aligned} & k - k/r & & \text{if } \; 0 < \lambda \leq n-k,\\ & n - \lambda - k/r & & \text{if } \; n-k < \lambda, \end{aligned} \right.$$ and $$\frac{n-k}n \frac 1p + \frac 1r + \frac { \beta + \lambda} n = 2 -\frac kn.$$ Remarkably, there is no upper bound for $\lambda$, which is quite different from the case with the weight $|y|^{-\beta}$, commonly known as Stein-Weiss inequalities. We also show that the above condition for $\beta$ is sharp. Apparently, the above inequality includes the classical Hardy-Littlewood-Sobolev inequality when $k=0$ and the HLS inequality on the upper half space $\mathbf R_+^n$ when $k=1$. In the unweighted case, namely $\beta=0$, our finding immediately leads to the sharp HLS inequality on $\mathbf R^{n-k} \times \mathbf R^n$ with the \textit{optimal} range $$0<\lambda<n-k/r,$$ which has not been observed before, even for the case $k=1$. Improvement to the Stein-Weiss inequality in the context of $\mathbf R^{n-k} \times \mathbf R^n$ is also considered. The existence of an optimal pair for this new inequality is also studied.Comment: 26 pages, 0 figur

ENGLISH-MAJORED STUDENTS' MOST COMMON CAREER OPTIONS AND THE LEVELS OF READINESS FOR THE CAREERS

EFL students nowadays have a variety of career options. Most of them, however, still do not have a well-understanding or a strong readiness for their job targets. This study was conducted to find out the EFL students’ most career options, some language standards when selecting careers and to what extent students feel that they are ready for their future careers. To answer these questions, we use exploratory questionnaires to survey the participants. The findings demonstrate that teaching English is the most attractive career that EFL students want to attend after graduating, followed by the freelancer. However, a group of students still cannot locate their future careers. Additionally, juniors and seniors are considered to have better preparation for their career prospects than freshmen and sophomores.  Article visualizations

Outage performance analysis of non-orthogonal multiple access systems with RF energy harvesting

Non-orthogonal multiple access (NOMA) has drawn enormous attention from the research community as a promising technology for future wireless communications with increasing demands of capacity and throughput. Especially, in the light of fifth-generation (5G) communication where multiple internet-of-things (IoT) devices are connected, the application of NOMA to indoor wireless networks has become more interesting to study. In view of this, we investigate the NOMA technique in energy harvesting (EH) half-duplex (HD) decode-and-forward (DF) power-splitting relaying (PSR) networks over indoor scenarios which are characterized by log-normal fading channels. The system performance of such networks is evaluated in terms of outage probability (OP) and total throughput for delay-limited transmission mode whose expressions are derived herein. In general, we can see in details how different system parameters affect such networks thanks to the results from Monte Carlo simulations. For illustrating the accuracy of our analytical results, we plot them along with the theoretical ones for comparison