A Tracker Solution for a Holographic Dark Energy Model

We investigate a kind of holographic dark energy model with the future event horizon the IR cutoff and the equation of state -1. In this model, the constraint on the equation of state automatically specifies an interaction between matter and dark energy. With this interaction included, an accelerating expansion is obtained as well as the transition from deceleration to acceleration. It is found that there exists a stable tracker solution for the numerical parameter $d>1$, and $d$ smaller than one will not lead to a physical solution. This model provides another possible phenomenological framework to alleviate the cosmological coincidence problem in the context of holographic dark energy. Some properties of the evolution which are relevant to cosmological parameters are also discussed.Comment: 10 pages, 3 figures; accepted for publication in Int.J.Mod.Phys.

Small trocar site hernia after laparoscopy

AbstractThis review article is attempted to review the cases of 5-mm trocar site hernias (TSHs) after laparoscopic surgery and identify the risks associated with incarceration. We searched the English literature on the PubMed website using the key words “trocar site hernia” and “5 mm”. We evaluated a total of 24 cases of 5-mm TSHs and analyzed and results showed that 17 (71%) and 7 (29%) resulted from gynecologic and gastrointestinal surgeries, respectively. The majority were found at the lateral abdomen (87.5%) and recognized within 2 weeks (87.5%). The most frequently herniated organ (n = 14) was the small bowel. Up to 62.5% of cases (n = 15) were repaired by exploratory laparotomy, and 25% (n = 6) required resection of herniated organs secondary to incarceration. The cases with incarceration were detected at 4.3 ± 2.2 days post-operation and those without incarceration at 47.4 days post-operation. No risk factors could be identified to show a correlation between 5-mm TSHs and incarceration. We concluded that immediate 1--2-week postoperative care is of most importance, since the majority of 5-mm trocar site hernias with or without incarceration occurred within this period

Organic Molecules in Low-Mass Protostellar Hot Cores: Submillimeter Imaging of IRAS 16293-2422

Arcsecond-resolution spectral observations toward the protobinary system IRAS 16293-2422 at 344 and 354 GHz were conducted using the Submillimeter Array. Complex organic molecules such as CH3OH and HCOOCH3 were detected. Together with the rich organic inventory revealed, it clearly indicates the existence of two, rather than one, compact hot molecular cores (smaller than or equal to 400 AU in radius) associated with each of the protobinary components identified by their dust continuum emission in the inner star-forming core.Comment: 11 pages, 3 figures, to be published in ApJ

2014-2015 Dean\u27s Showcase No. 3

https://spiral.lynn.edu/conservatory_deansshowcase/1012/thumbnail.jp

Vision meets mmWave Radar: 3D Object Perception Benchmark for Autonomous Driving

Sensor fusion is crucial for an accurate and robust perception system on autonomous vehicles. Most existing datasets and perception solutions focus on fusing cameras and LiDAR. However, the collaboration between camera and radar is significantly under-exploited. The incorporation of rich semantic information from the camera, and reliable 3D information from the radar can potentially achieve an efficient, cheap, and portable solution for 3D object perception tasks. It can also be robust to different lighting or all-weather driving scenarios due to the capability of mmWave radars. In this paper, we introduce the CRUW3D dataset, including 66K synchronized and well-calibrated camera, radar, and LiDAR frames in various driving scenarios. Unlike other large-scale autonomous driving datasets, our radar data is in the format of radio frequency (RF) tensors that contain not only 3D location information but also spatio-temporal semantic information. This kind of radar format can enable machine learning models to generate more reliable object perception results after interacting and fusing the information or features between the camera and radar