为了解决防污染封隔器密封不严和解卡打捞困难等问题,研制了JDY455可取式多用途丢手封隔器。该封隔器采用液压双级坐封工具坐封、双向卡瓦锚定、上提油管解封,密封、锚定安全可靠,内、外中心管采取脱节式设计,解卡力小;一封多用,不仅可...为了解决防污染封隔器密封不严和解卡打捞困难等问题,研制了JDY455可取式多用途丢手封隔器。该封隔器采用液压双级坐封工具坐封、双向卡瓦锚定、上提油管解封,密封、锚定安全可靠,内、外中心管采取脱节式设计,解卡力小;一封多用,不仅可代替桥塞进行卡堵水作业,还可用于天然气井生产、气举、注水和封层等多种增产措施。试验和应用结果表明,封隔器的工作压差达到35 MPa,工作温度150℃,解卡力58 k N,满足冀东油田防污染工艺要求。展开更多
为适应聚变-裂变混合堆设计及其相关研究的需求制作混合多用途核数据库HENDL(HybridEvaluated Nuclear Data Library)的升级版本HENDL2.0。评价核数据来源主要选用美国公布的ENDF/B-Ⅶ.0库和国际原子能机构(IAEA/NDS)发布的聚变库FENDL-...为适应聚变-裂变混合堆设计及其相关研究的需求制作混合多用途核数据库HENDL(HybridEvaluated Nuclear Data Library)的升级版本HENDL2.0。评价核数据来源主要选用美国公布的ENDF/B-Ⅶ.0库和国际原子能机构(IAEA/NDS)发布的聚变库FENDL-2.1。利用蒙特卡罗粒子输运程序MCNP以及FDS团队自主研发的大型集成多功能中子学计算与分析系统VisualBUS程序进行模拟计算,对已有的一些数据较为完备的基准实验例题进行基准测试和比较分析以检验混合库HENDL2.0的有效性和可信性。展开更多
To make speech watermarking achieve both copyright protection and integrity verification, a novel multipurpose speech watermarking algorithm based on the multistage vector quantization （MSVQ） of linear prediction co...To make speech watermarking achieve both copyright protection and integrity verification, a novel multipurpose speech watermarking algorithm based on the multistage vector quantization （MSVQ） of linear prediction coefficients （LPCs） is presented in this article. The property of natural speech that the vector quantization （VQ） indices of the LPCs amongst neighboring frames tend to be very similar is utilized to embed the robust watermark in the indices of the first-stage VQ（VQ1）. Then, the semi-fragile watermark is embedded in the indices of the second-stage VQ（VQ2） with index constrained VQ encoding scheme. Both the robust watermark and the semi-fragile watermark can be extracted without host speech. Simulation results verify the effectiveness of the proposed algorithm in terms of robustness and semi-fragility.展开更多
文摘为了解决防污染封隔器密封不严和解卡打捞困难等问题,研制了JDY455可取式多用途丢手封隔器。该封隔器采用液压双级坐封工具坐封、双向卡瓦锚定、上提油管解封,密封、锚定安全可靠,内、外中心管采取脱节式设计,解卡力小;一封多用,不仅可代替桥塞进行卡堵水作业,还可用于天然气井生产、气举、注水和封层等多种增产措施。试验和应用结果表明,封隔器的工作压差达到35 MPa,工作温度150℃,解卡力58 k N,满足冀东油田防污染工艺要求。
文摘为适应聚变-裂变混合堆设计及其相关研究的需求制作混合多用途核数据库HENDL(HybridEvaluated Nuclear Data Library)的升级版本HENDL2.0。评价核数据来源主要选用美国公布的ENDF/B-Ⅶ.0库和国际原子能机构(IAEA/NDS)发布的聚变库FENDL-2.1。利用蒙特卡罗粒子输运程序MCNP以及FDS团队自主研发的大型集成多功能中子学计算与分析系统VisualBUS程序进行模拟计算,对已有的一些数据较为完备的基准实验例题进行基准测试和比较分析以检验混合库HENDL2.0的有效性和可信性。
文摘To make speech watermarking achieve both copyright protection and integrity verification, a novel multipurpose speech watermarking algorithm based on the multistage vector quantization （MSVQ） of linear prediction coefficients （LPCs） is presented in this article. The property of natural speech that the vector quantization （VQ） indices of the LPCs amongst neighboring frames tend to be very similar is utilized to embed the robust watermark in the indices of the first-stage VQ（VQ1）. Then, the semi-fragile watermark is embedded in the indices of the second-stage VQ（VQ2） with index constrained VQ encoding scheme. Both the robust watermark and the semi-fragile watermark can be extracted without host speech. Simulation results verify the effectiveness of the proposed algorithm in terms of robustness and semi-fragility.
