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浏览/检索结果: 共4条，第1-4条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Model-independent distance calibration of high-redshift gamma-ray bursts and constrain on the Lambda CDM model 期刊论文 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 卷号: 455, 期号: 2, 页码: 2131-2138 作者:  Lin, HN;  Li, X;  Chang, Z 收藏  |  浏览/下载：10/0  |  提交时间：2019/04/08 gamma-ray burst: general  GREATER-THAN 1  cosmological parameters  HUBBLE DIAGRAM  COSMOLOGICAL IMPLICATIONS  STANDARD CANDLES  PEAK LUMINOSITY  DARK-ENERGY  SUPERNOVAE  SPECTRA  ENERGETICS  UNIVERSE   Different setup errors assessed by weekly cone-beam computed tomography on different registration in nasopharyngeal carcinoma treated with intensity-modulated radiation therapy 期刊论文 OncoTargets and Therapy, 2015, 卷号: 8, 页码: 2545-2553 作者:  Su, Jiqing;  Chen, Wen;  Yang, Huiyun;  Hong, Jidong;  Zhang, Zijian 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/03 The study aimed to investigate the difference of setup errors on different registration in the treatment of nasopharyngeal carcinoma based on weekly cone-beam computed tomography (CBCT). Thirty nasopharyngeal cancer patients scheduled to undergo intensity-modulated radiotherapy (IMRT) were prospectively enrolled in the study. Each patient had a weekly CBCT before radiation therapy. In the entire study  201 CBCT scans were obtained. The scans were registered to the planning CT to determine the difference of setup errors on different registration sites. Different registration sites were represented by bony landmarks. Nasal septum and pterygoid process represent head  cervical vertebrae 1–3 represent upper neck  and cervical vertebrae 4–6 represent lower neck. Patient positioning errors were recorded in the right–left (RL)  superior–inferior (SI)  and anterior–posterior (AP) directions over the course of radiotherapy. Planning target volume margins were calculated from the systematic and random errors. In this study  we can make a conclusion that there are setup errors in RL  SI  and AP directions of nasopharyngeal carcinoma patients undergoing IMRT. In addition  the head and neck setup error has the difference  with statistical significance  while patient setup error of neck is greater than that of head during the course of radiotherapy. In our institution  we recommend a planning target volume margin of 3.0 mm in RL direction  1.3 mm in SI direction  and 2.6 mm in AP direction for nasopharyngeal cancer patients undergoing IMRT with weekly CBCT scans.   Separation of Succinic Acid from Fermentation Broth Using Weak Alkaline Anion Exchange Adsorbents 期刊论文 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2009, 卷号: 48, 期号: 7, 页码: 3595-3599 作者:  Li, Qiang;  Xing, Jianmin;  Li, Wangliang;  Liu, Qingfen;  Su, Zhiguo 收藏  |  浏览/下载：32/0  |  提交时间：2013/12/10 MANNHEIMIA-SUCCINICIPRODUCENS  AQUEOUS-SOLUTIONS  EXTRACTION  SORPTION  REMOVAL  PH-GREATER-THAN-PK(A1)  PURIFICATION  ADSORPTION  RECOVERY  KINETICS   A new spaceborne compression approach for remote sensing imagery (EI CONFERENCE) 会议论文 ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China Xu X.; Dong G.; Feng Y.; Xu S. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 After analyzing advantages and disadvantages of these typical encoding methods: SPIHT and VQ  a "DWT+MRLE" approach for spaceborne data compression was proposed in this paper. This approach includes two steps: Discrete Wavelet Transform (DWT) and Modified Run Length Encoding (MRLE). The former used CDF9/7 biorthogonal wavelet filters to powerfully get rid of correlation between pixels in imagery. The later put enlightening information into the lowest bit of some key-position transform coefficients. Consequently  CDF9/7 and MRLE together make hardware platform remain high real-time capability  and help reconstructed images keep good fidelity with PSNR being about 40dB  compared with the original ones. Comparison between experimentations on SPOT4's low-spatial-resolution (10m) imagery and Ikonos2's high-spatial-resolution (1m) imagery  shows this "DWT+MRLE" method having better performance for remote-sensed imagery  especially those of higher resolution. Although inferior to 8:1  Compression Ration (CR) here near 5:1 is greater than France SPOT5's 3:1 and American Ikonos2's 11:2.6 on-board data compression. More important  this method having less computational amount is good for spaceborne capability of real time. The consumed time of different image size is also presented in this paper  based on TI TMSC6416 DSP chip with 600MHz CPU cycle clock.