Improvement of conversion efficiency of atom-molecule Bose-Einstein condensate

We investigate the stimulated Raman adiabatic passage in two-color photoassociation for a atom-molecule Bose-Einstein condensate. By applying two time-varying Guassian laser pulses that fulfill generalized two-photon resonance condition, we obtain highly efficient atom-molecule conversion. The efficiency depends on the free-bound detuning and the delay time between the two pulses. By adjusting the parameters optimally, we achieve 92% conversion efficiency.Comment: 4 pages, 4 figures. To be appeared in J. Korean Phys. Society (JKPS

Storage of spin squeezing in a two-component Bose-Einstein condensate

Efficient control of spin squeezing in a two-component Bose-Einstein Condensate is studied by rapidly turning-off the external field at a time that maximal spin squeezing appears. We show that strong reduction of spin fluctuation can be maintained in a nearly fixed direction for a long time. We explain the underlying physics unambiguously, and present analytical expressions of the maximal-squeezing time.Comment: 10 pages, 5 figures. This version is slightly different from the one published in Phys. Rev. Let

Spin squeezing and maximal-squeezing time

Spin squeezing of a nonlinear interaction model with Josephson-like coupling is studied to obtain time scale of maximal squeezing. Based upon two exactly solvable cases for two and three particles, we find that the maximal-squeezing time depends on the level spacing between the ground state and its next neighbor eigenstate.Comment: 7 pages, 5 figures, 1 table. Resubmitted to Phys. Rev.

Forgiveness in Resolving Marital Conflict among Korean Immigrant Baby-boomer Couples at Calvary Mission Church in Los Angeles

This ministry focus paper presents the importance of forgiveness, specifically as it relates to troubled Korean immigrant couples of the Baby-boom generation. The paper is describes and discusses the marriage counseling program conducted within the Korean immigrant community of Los Angeles by Calvary Mission Church. The history of this church in Los Angeles and its marriage counseling program, the Counseling Education Institute for Korean Marriage and Family, are presented. The unique historical and cultural characteristics of the local Korean immigrant population are discussed, with special attention to the cultural background of Korean immigrants and the challenge of marriage counseling work. For instance, the background of Confucianism and its traditional teachings about marriage and family create difficulties for Korean immigrant couples attempting to adapt to life in the United States and for marriage counselors to work with them. The biblical and theological importance of forgiveness is discussed, with special emphasis on the centrality of forgiveness to the ministry of Christ, and its continuing deep significance for all Christians, including troubled Korean immigrant boomer couples. It is argued that forgiveness, along with repentance and reconciliation, is a key biblical solution for resolving marital conflict. A three-step model of forgiveness is also included, incorporating repentance and reconciliation. Initiating and maintaining changes of thoughts are examined. Identifying and diagnosing marital conflicts and their remedies are provided. Maximizing forgiveness allows spouses to embody sincere forgiveness by using two procedures. The content and practices of a three-day marriage retreat are described in detail, as are follow-up procedures used to enhance and extend the practices of forgiveness in the participants’ daily lives. Content Reader: Brad Stenberg, Ph

An Alternative Fuel Refueling Station Location Model considering Detour Traffic Flows on a Highway Road System

With the development of alternative fuel (AF) vehicle technologies, studies on finding the potential location of AF refueling stations in transportation networks have received considerable attention. Due to the strong limited driving range, AF vehicles for long-distance intercity trips may require multiple refueling stops at different locations on the way to their destination, which makes the AF refueling station location problem more challenging. In this paper, we consider that AF vehicles requiring multiple refueling stops at different locations during their long-distance intercity trips are capable of making detours from their preplanned paths and selecting return paths that may be different from original paths for their round trips whenever AF refueling stations are not available along the preplanned paths. These options mostly need to be considered when an AF refueling infrastructure is not fully developed on a highway system. To this end, we first propose an algorithm to generate alternative paths that may provide the multiple AF refueling stops between all origin/destination (OD) vertices. Then, a new mixed-integer programming model is proposed to locate AF refueling stations within a preselected set of candidate sites on a directed transportation network by maximizing the coverage of traffic flows along multiple paths. We first test our mathematical model with the proposed algorithm on a classical 25-vertex network with 25 candidate sites through various scenarios that consider a different number of paths for each OD pair, deviation factors, and limited driving ranges of vehicles. Then, we apply our proposed model to locate liquefied natural gas refueling stations in the state of Pennsylvania considering the construction budget. Our results show that the number of alternative paths and deviation distance available significantly affect the coverage of traffic flows at the stations as well as computational time

An analysis of price responses to public information: a case study of the USDA corn crop forecasts

Crop forecast errors were defined as the differences between the five-year revised final estimates of corn production and the monthly USDA corn crop forecasts. It was found that the monthly forecast errors were normally distributed according to the Shapiro-Wilk W Statistics and Probability; An F test, based on Hotelling\u27s T(\u272) statistics showed that the means of the monthly USDA corn crop forecasts were not statistically different from the five-year revised final estimates at the 5% significance level. When a nonparametric L test was employed, the accuracy of the monthly USDA corn crop forecasts was noted to improve over the reporting months, from July to December. Regression analysis revealed that the best estimate of the final crop size was the most recent month\u27s USDA corn crop forecast;The impact of the USDA corn crop forecasts on daily cash and futures corn prices were analyzed within the framework of the supply-of-storage theory. When the inter-temporal price spreads were assumed to be a function of the number of grain-consuming animal units and the difference of the two adjacent months\u27 USDA corn crop forecasts, the August USDA corn crop forecast was found to be the only crop forecast to influence the cash and futures prices observed on the day immediately following the day of the crop announcement. Anticipated effect of the October forecast on cash prices was present during the three days prior to the announcement while that of the November forecast on cash prices was felt during the two days prior to the announcement. Anticipated effect of these forecasts, however, was not present in futures prices;When the past price movements were introduced into the model, the results found were not significantly different from those obtained under the earlier assumption, in that only the August forecast had an impact on the cash prices and on the September and December futures prices observed in August at the 1% significance level