Signature of Quantum Criticality in the Density Profiles of Cold Atom Systems

In recent years, there is considerable experimental effort using cold atoms to study strongly correlated many-body systems. One class of phenomena of particularly interests is quantum critical (QC) phenomena. While prevalent in many materials, these phenomena are notoriously difficult theoretical problems due to the vanishing of energy scales in QC region. So far, there are no systematic ways to deduce QC behavior of bulk systems from the data of trapped atomic gases. Here, we present a simple algorithm to use the experimental density profile to determine the T=0 phase boundary of bulk systems, as well as the scaling functions in QC regime. We also present another scheme for removing finite size effects of the trap. We demonstrate the validity of our schemes using exactly soluble models.Comment: 4 pages, 5 figure

Penggunaan Media Teknologi, Student Engagement, Dan Kinerja Dalam Pembelajaran Akuntansi: Studi Kasus Pada Accounting Software “Accurate”

The purpose of this study is to research the relation about accounting software (Accurate)and student engagement and student performance. A number of 186 students in accounting class of Maranatha Christian University participated in this research and valid data is 128. Regression Linear and descriptive analysis are used in this research. The results show that the value of R-square is 0.993, it indicates that there is linear correlation between engagement and students’ score in practical accounting software (Accurate)

Critical flux-based membrane fouling control of forward osmosis: Behavior, sustainability, and reversibility

Membrane fouling is closely related to the concept of critical flux. Therefore, a fouling control strategy for forward osmosis (FO) membranes that is based on the critical flux is necessary. This study systematically investigated the critical flux behavior of FO membranes (CTA and PA-TFC) in the short-term using a stepping method (draw solution (DS) concentration stepping). In addition, to test the reliability of this method, long-term experiments were conducted to evaluate the influences of operational critical flux on the fouling behavior (sustainable operation and fouling reversibility/irreversibility), thereby determining the critical flux for reversibility. Our results showed that the DS concentration stepping could be applied for critical flux determination in FO. Both membranes exhibited higher critical flux values for alginate fouling compared to other single foulants such as colloidal silica or gypsum. The values were 15.9 LMH for a cellulose triacetate membrane (CTA) and 20.5 LMH for the polyamide thin-film composite (PA-TFC). Whilst these values should be adequate in FO applications they were determined for single foulants. The presence of multispecies of foulants caused a significant decline in the critical flux values. This study found 5.4 LMH for the CTA membrane and 8.3 LMH for the PA-TFC membrane for the combined foulants of alginate + gypsum. This indicates that the critical flux behavior in FO was dependent on the foulant type and membrane type. Importantly, the high restoration of water flux was achieved with the PA-TFC membrane at an operation either close to critical flux (92–98%) or below critical flux (98–100%) (i.e., with negligible irreversible fouling). The critical fluxes for reversibility obtained in this study will aid the efficient operation of practical FO processes

Limit Analysis of Strain Softening Frames Allowing for Geometric Nonlinearity

This paper extends classical limit analysis to account for strain softening and 2nd-order geometric nonlinearity simultaneously. The formulation is an instance of the challenging class of socalled (nonconvex) mathematical programs with equilibrium constraints (MPECs). A penalty algorithm is proposed to solve the MPEC. A practical frame example is provided to illustrate the approach

Peranan Anggaran Produksi sebagai Alat Bantu Manajemen dalam Menunjang Efektifitas Produksi

PT. Timbul Jaya is a rice milling company that produces rice, which in the production process required costs endured by the company. Production budgets are made to control these costs, which originated from the budget-making sales to BBB budget, BTKL budget, and BOP budget. By comparing the budget with the realization, management can know when a deviation occurs and whether the deviation is harmful or beneficial to the company. The company set a tolerance limit of 5% deviation.Making the production budget is useful for management as a tool in supporting the cost effectiveness of production. Production costs can be said to be effective, if there is a favorable difference of the cost of the actual standard. In 2009 raw materials cannot be said to be effective, because there are differences that are unfavorable, due to price differences that are controlled by the market price. Difference BTKL unfavorable because of the large total production depending on market demand. Favorable differentiation of BOP in 2008 and 2009 reflected that the BOP has been effective and can be controlled by the company.Overall, the company experienced a favorable difference in production costs so it can be said effectively, but the company needs to pay more attention to the price of raw materials and direct labor costs that have not been restrained because of unprofitable differentiation