便携式数字调频式立体声收音机的研究与设计     

胡荣 《科技广场》2012,(6):91-93

本文选用当前手机中广泛应用的专用集成调频式立体声收音机芯片TEA5767,以廉价单片机STC89C52为控制核心,辅以外围电路,为较好实现便携式调频式立体声收音机提供了一种新途径。  相似文献   

关于图书馆传统音像资料的数字化处理   总被引：3，自引：0，他引：3  

卢云  邹忠民 《中国图书馆学报》2004,30(5)

由于传统的音像制作方法、录放设备的发展变化和人们欣赏习惯的改变,音像资料从 模拟转向数字已成必然。这种转换,要经过音视频的数字化处理系统、转录和编辑,以及其数字 化存储等技术处理。数字化过程中必须注重技术操作要点。参考文献8。  相似文献   

Polymorphisms within the COL5A1 gene and regulators of the extracellular matrix modify the risk of Achilles tendon pathology in a British case-control study     

Karryn L. Brown  Kirsten B. Seale  Louis Y. El Khoury  Michael Posthumus  William J. Ribbans  Stuart M. Raleigh 《Journal of sports sciences》2017,35(15):1475-1483

Several genetic loci have been associated with risk of Achilles tendon pathology (ATP) within South African and Australian populations. The aim of this study was, therefore, to evaluate eight previously implicated genetic variants in an independent British population. A total of 130 asymptomatic controls (CON) and 112 participants clinically diagnosed with ATP comprising 87 individuals with chronic Achilles tendinopathy (TEN) and 25 with Achilles tendon ruptures (RUP) were included. All participants were genotyped for variants within the COL5A1, MIR608, IL-1β, IL-6 and CASP8 genes. Primary findings implicated COL5A1 and CASP8. Three inferred allele combinations constructed from COL5A1 rs12722, rs3196378 and rs71746744 were identified as risk modifiers. The T–C–D combination was associated with increased risk of ATP (P = 0.023) and RUP (P < 0.001), the C–A–I combination was associated with increased risk of ATP (P = 0.011), TEN (P = 0.011) and RUP (P = 0.011) and the C–C–D combination was associated with decreased risk of ATP (P = 0.011) and RUP (P = 0.004). The CASP8 rs3834129 DD genotype was associated with decreased risk of TEN (P = 0.020, odds ratio: 0.45, 95% confidence interval: 0.22–0.90) and the CASP8 I–G (rs3834129–rs1045485) inferred allele combination was associated with increased risk of TEN (P = 0.031). This study further highlights the importance of polymorphisms within COL5A1 and CASP8 in the aetiology of ATP.  相似文献   

KdV方程的Darboux变换     

肖奕  刘小娟 《湖南师范大学教育科学学报》1999,(5)

分析了标准Ｄａｒｂｏｕｘ 变换方法用于ＫｄＶ方程时遇到的困难,然后利用同一个ＫｄＶ方程的两个不同的Ｌａｘ 表示,导出了ＫｄＶ方程Ｄａｒｂｏｕｘ 变换．利用该变换就可以递推导出所有孤子解．  相似文献   

“V以”类形式动词的多角度考察     

王伟 《合肥教育学院学报》2012,(4):53-57

“V以”类形式动词是语法学界尚缺乏系统研究的一类动词,文章通过选择研究对象的语义、句法及语用功能进行了多角度考察。语义方面,探讨了“V以”类词的语义特征及深层语义结构特征;甸法方面,探讨了“V以”类词在句式结构、加宾语及带体貌助词等方面的共性,同时揭示了它们在搭配能力和搭配范围方面的区别;语用功能方面,探讨了“V以”类词具有标记焦点、变陈述为指称、填补谓语的缺失等功能。  相似文献   

基于AT89C52的LED智能路灯控制系统设计     

朱平哲 《宁波职业技术学院学报》2014,(1):87-90

为解决现有路灯控制系统在灯光控制方法、节能及功能方面的不足,提出了一种以AT89C52单片机为核心的LED智能路灯控制系统。该系统使用传感器检测技术,采用恒流源驱动路灯,可以根据交通和环境情况自动调节灯的状态,显示、控制路灯的亮灭时间。当路灯出现故障时,支路控制器可发出声光报警信号,同时显示出故障路灯的地址编号。该系统经过测试实验,能耗低、性价比高,具有较高的实际应用价值。  相似文献   

高住低训对国家男子橄榄球运动员体能的影响     

黄亚茹  郑红军  潘峰  包大鹏  衣龙燕  周多奇  胡扬 《中国体育科技》2007,43(6):59-62

研究高住低训(HiLo)提高橄榄球运动员体能的效果。将14名国家男子橄榄球队运动员随机分成HiLo组(n=8)和LoLo组(n=6),进行为期4周的实验。HiLo组每晚在O2浓度为14.7%的实验室居住10h。每周除正常训练外,还有3次30min在O2浓度为15.4%、强度为个体72%V.O2max的功率自行车运动。LoLo组的训练方案与HiLo组相同,但没有低氧居住和低氧运动。每周3次的30min功率自行车运动在常氧环境下进行,强度为个体80%V.O2max。结果表明,HiLo可以显著提高运动员有氧耐力,12min跑成绩明显提高;对4种距离折返跑时间、球门折返跑等无氧能力的提高也有一定帮助;对Hb等血象指标的提高没有显著作用,但可以保持运动员正常的Hb水平。  相似文献   

“三线放松功”对运动后血乳酸及血气主要指标HCO_3~-、PaCO_2恢复影响的研究     

王耀光 《西安体育学院学报》1997,(2)

把气功作为一种恢复手段，在运动后的恢复期内，通过采用挠动脉留置针外接三路活塞技术采血，连续观察气功入静对ＢＬ、Ｈｂ、ｐＨ、ＳＢＣ、ＡＢＣ、ＳＢＥ、ＢＥ、ＰａＣＯ２、ＴＣＯ２、ＰａＯ２及ＳＡＴ恢复的影响。实验结果表明，气功入静对血乳酸及血气的恢复具有良好的效果，是一种较好的恢复手段  相似文献   

活性炭富集PAR-H2O2三元体系分光光度法测定痕量V(V)     

任晓棠 《天水师范学院学报》2004,24(5):36-37

采用PAR-H2O2三元体系的显色方法,负载SAF活性炭富集水样,测定水中痕量V(V),结果令人相当满意.  相似文献   

Acquisition of inductive biconditional reasoning skills: Training of simultaneous and sequential processing     

Seong-Soo Lee 《Contemporary educational psychology》1982,7(4):371-383

One hundred forty-four 10th-grade students received training on one of three processing methods: coding-mapping (simultaneous), coding only, or decision tree (sequential). Then they learned a biconditional rule under one of eight transfer test conditions based on a 2 (paradigm: rule vs complete learning) × 2 (memory aids: 0 vs 4) × 2 (focus instance: presence vs absence) design. Although the coding-mapping students processed concept instances in much the same way as the coding-only students, they acquired the target rule more frequently, and they processed instances more quickly and more consistently than the decision-tree students. The observed ordinality of the responses of four truth-table classes was found to be more consistent with the simultaneity than with the sequentiality hypothesis. As expected, training interacted with paradigm and also with memory aids and focus instance. The induced simultaneous processing strategy apparently works optimally under rule learning, while the sequential strategy is difficult to induce and/or not optimal for rule-learning operations.  相似文献