Cirrus HD-OCT测量近视患者角膜厚度的应用研究

目的对比分析Cirrus HD-OCT和A超测量中央角膜厚度的差异性及相关性,并探索Cirrus HD-OCT角膜测厚与眼轴长度的关系。方法回顾性研究2015年1月至4月拟在我院行角膜激光矫正近视手术的患者42例（84眼）,按眼轴长度分为三组,A组（32眼）：眼轴长度24~26 mm组;B组（31眼）：眼轴长度〉26~28 mm组;C组（21眼）：眼轴长度〉28 mm组。利用Cirrus HD-OCT和A超分别测量患者的中央角膜厚度,用配对t检验来比较两种方法测厚的差异性,用Pearson分析两种方法测厚的相关性,用两独立样本t检验比较不同眼轴组角膜厚度的差异性。结果 A组Cirrus HD-OCT和A超测量患者的中央角膜厚度分别为（539.91±30.74）μm和（540.22±30.79）μm,测量结果差异无统计学意义（t=0.230,P〉0.05）。B组Cirrus HDOCT和A超测量患者的中央角膜厚度分别为（543.94±31.75）μm和（544.36±33.58）μm,测量结果差异无统计学意义（t=0.304,P〉0.05）。C组Cirrus HD-OCT和A超测量患者的中央角膜厚度分别为（548.19±25.81）μm和（545.43±26.70）μm,测量结果差异也无统计学意义（t=1.766,P〉0.05）。Cirrus HD-OCT和A超测量结果具有显著正相关性（r=0.97,P〈0.05）。三组间Cirrus HD-OCT角膜测厚的差异性比较,A组与B组测量值差异无统计学意义（t=0.504,P〉0.05）、A组与C组测量值差异无统计学意义（t=0.999,P〉0.05）、B组与C组测量值差异无统计学意义（t=0.499,P〉0.05）。Cirrus HD-OCT测量角膜厚度与眼轴长度无相关性。结论 Cirrus HD-OCT测量中央角膜厚度结果可靠,且Cirrus HD-OCT和A超的测量结果显著的正相关。Cirrus HD-OCT角膜测厚与眼轴长度无关。

Cirrus Logic纯正数字LED控制器实现量产

LED灯泡具有卓越的能效和较长寿命,被认为是白炽灯和紧凑型荧光灯的替代者。据统计,全球灯具的安装基数达到近400亿只,照明应用中的LED灯具市场将从2011年的约2亿盏增长到2015年的10亿盏,照明市场蕴含着巨大商机。影响LED灯泡大规模采用的主要障碍是费用较昂贵,以及与紧凑型荧光灯一样的调光兼容性问题。当今的LED灯泡主要基于模拟驱动器，

Cirrus HD OCT测量近视人群的青光眼诊断参数对比研究

目的采用Cirrus HD OCT测量近视人群的青光眼诊断参数差异性及近视人群的特征。方法选取2016年1月至2017年8月,就诊于我院的18~35岁不同近视程度的患者共95例(190只眼)。记录患者性别、年龄,采集其眼轴、医学验光屈光度(等效球镜)、视盘周围视网膜神经纤维层厚度(cpRNFL)包括平均、上下方,颞鼻侧5个参数、黄斑部神经节细胞和内丛状层(GCIPL)厚度包括平均、最小、上下方、鼻颞侧6个参数。根据屈光度分为A组(-0.25~3.0D);B组(-3.25^-6.0D);C组(>-6.0D),采用单因素方差分析进行所有参数的组间比较。采用Pear-son相关性分析不同屈光度与眼轴、GCIPL厚度、cpRNFL厚度的相关性及GCIPL厚度与cpRNFL厚度之间相关性。结果各组的性别及年龄无统计学差异。但各组间平均屈光度差异有统计学意义(F=521.963,P=0.000),眼轴和屈光度之间呈显著负相关(相关系数-0.706,P=0.000)。根据屈光度分组,所有参数各组之间均有显著差异(F=3.396~16.305,P<0.05)。cpRNFL厚度除颞侧外均与屈光度呈负相关(相关系数-0.316^-0.212,P<0.05),GCLIP厚度各参数均与屈光度呈负相关(相关系数-0.205^-0.384,P<0.05)。两种参数之间除颞侧外,其余参数均具呈正相关性(相关系数0.222~0.559),GCIPL与cpRNFL厚度在近视人群中均随屈光度发生一定的改变。结论近视眼cpRNFL厚度上下方及鼻侧象限均随屈光度增大逐渐变薄,颞侧变厚。GCIPL厚度各参数均随屈光度增大逐渐变薄,二者具有很好的一致性。近视人群采用此两种方法评估青光眼损害时,均需要考虑近视程度对参数的影响。

Cirrus Cloud Macrophysical and Optical Properties over North China from CALIOP Measurements

Two years of mid-latitude cirrus cloud macrophysical and optical properties over North China are described from Earth-orbiting Cloud-Aerosol Lidar with Orthogonal Polarization(CALIOP) satellite measurements. Global cloud climatological studies based on active remote sensing data sets benefit from more accurate resolution of vertical structure and more reliable detection of optically thin layers.The mean values for cirrus cases over North China are 0.19±0.18 for infrared emittance,0.41±0.68 for visible optical depth, 0.26±0.12 for integrated depolarization ratio,and 0.72±0.22 for integrated color ratio.When studied using reasonable assumptions for the relationship between extinction and ice crystal backscatter coefficients,our results show that most of the cirrus clouds profiled using the 0.532μm channel data stream correspond with an optical depth of less than 1.0.The dependence of cirrus cloud properties on cirrus cloud mid-cloud temperature and geometry thickness are generally similar to the results derived from the ground-based lidar, which are mainly impacted by the adiabatic process on the ice cloud content.However,the differences in macrophysical parameter variability indicate the limits of spaceborne-lidar and dissimilarities in regional climate variability and the nature and source of cloud nuclei in different geographical regions.

Cloud-Base Distribution and Cirrus Properties Based on Micropulse Lidar Measurements at a Site in Southeastern China

The cloud fraction （CF） and cloud-base heights （CBHs）, and cirrus properties, over a site in southeastern China from June 2008 to May 2009, are examined by a ground-based lidar. Results show that clouds occupied the sky 41% of the time. Significant seasonal variations in CF were found with a maximum/minimum during winter/summer and similar magnitudes of CF in spring and autumn. A distinct diurnal cycle in the overall mean CF was seen. Total, daytime, and nighttime annual mean CBHs were 3.05 ± 2.73 km, 2.46 ± 2.08 kin, and 3.51 ± 3.07 km, respectively. The lowest/highest CBH occurred around noon/midnight. Cirrus clouds were present ～36.2% of the time at night with the percentage increased in summer and decreased in spring. Annual mean values for cirrus geometrical properties were 8.89 ± 1.65 km, 9.80 ± 1.70 kin, 10.73 ± 1.86 km and 1.83± 0.91 km for the base, mid-cloud, top height, and the thickness, respectively. Seasonal variations in cirrus geometrical properties show a maximum/minimum in summer/winter for all cirrus geometrical parameters. The mean cirrus lidar ratio for all cirrus cases in our study was ～ 25 ± 17 sr, with a smooth seasonal trend. The cirrus optical depth ranged from 0.001 to 2.475, with a mean of 0.34 ± 0.33. Sub-visual, thin, and dense cirrus were observed in ～12%, 43%, and 45% of the cases, respectively. More frequent, thicker cirrus clouds occurred in summer than in any other season. The properties of cirrus cloud over the site are compared with other lidar-based retrievals of midlatitude cirrus cloud properties.

Cirrus芯片在矿用地震仪中的应用

针对煤矿井下地震仪器的特点,选用Cirrus Logic公司的地震勘探芯片组作为采集系统的核心部件。文中介绍了Cirrus Logic芯片的主要特点、构成、工作原理,并将其应用于矿用地震仪器中,设计了其硬件电路、并编写了控制软件,进行了试验测试。实验结果表明,所设计的仪器达到了煤矿井下防爆、微型化、低功耗、高速、高精度和便携性等要求。

Cirrus HD-OCT检测视网膜神经纤维层厚度在原发性慢性闭角型青光眼诊断中的应用

目的研究Cirrus HD-OCT检测视网膜神经纤维层厚度在青光眼诊断中的作用。方法选取2018年1月至2018年3月本院收治的原发性慢性闭角型青光眼患者100例作为观察组,另选取同期100名健康体检人员作为对照组,均实施OCT技术检测视网膜神经纤维层的厚度变化,分析两组各象限RNFL厚度、中心凹厚度、平均视网膜厚度。结果观察组受检人员视盘周围平均值(102.34±1.98)μm、颞象限(85.43±1.90)μm、上象限(122.20±1.24)μm、鼻象限(83.21±1.24)μm、下象限(121.42±1.34)μm均低于对照组,两组比较差异具有统计学意义(P<0.05);观察组受检人员中心凹厚度(179.02±1.24)μm、平均视网膜厚度(256.98±1.24)μm均高于对照组,差异具有统计学意义(P<0.05)。结论 Cirrus HD-OCT检测视网膜神经纤维层厚度在原发性慢性闭角型青光眼诊断中具有较高的应用价值。

Cirrus Logic推出首批数字PFCIC产品，性能与价格均超越模拟PFC

2010年6月10日，Cirrus Logic公司宣布为不断增长的能源相关市场开发了一个全新的产品线，推出行业首批数字功率因数校正（PFC）控制器IC，无论在性能还是价格上都超越了模拟PFC产品。相比传统模拟PFC产品，CS1500和CS1600为电源和照明镇流系统设计人员带来了更高的性能和简化的设计。两款IC的定价与模拟PFC接近，同时可将物料总成本降低高达0．25美元。

Cirrus Logic推出新型数字功率因数校正IC

2011年6月17日，领先的高精度模拟和数字信号处理元件提供商Cirrus Logic公司宣布推出新产品CS1501／CS1601，持续拓展了其数字功率因数校正（PFC）IC产品系列，强化了公司对新型数字能源控制相关产品的重视和关注。

Cirrus Logic扩展工业市场高精度运算放大器产品系列

Cirrus Logic公司推出CS300X系列高精度集成电路，扩展了其低成本高精度运算放大器产品系列，新产品解决了科学和工业测量应用领域中放大低电平模拟信号的难题。

Ice Nucleation of Cirrus Clouds Related to the Transported Dust Layer Observed by Ground-Based Lidars over Wuhan,China

Cirrus clouds related to transported dust layers were identified on 22 occasions with ground-based polarization lidar from December 2012 to February 2018 over Wuhan(30.5°N,114.4°E),China.All the events occurred in spring and winter.Cirrus clouds were mostly located above 7.6 km on top of the aloft dust layers.In-cloud relative humidity with respect to ice(RH_(i))derived from water vapor Raman lidar as well as from ERA5 reanalysis data were used as criteria to determine the possible ice nucleation regimes.Corresponding to the two typical cases shown,the observed events can be classified into two categories:(1)category A(3 cases),in-cloud peak RH_(i)≥150%,indicating competition between heterogeneous nucleation and homogeneous nucleation;and(2)category B(19 cases),in-cloud peak RH_(i)<150%,revealing that only heterogeneous nucleation was involved.Heterogeneous nucleation generally took place during instances of cirrus cloud formation in the upper troposphere when advected dust particles were present.Although accompanying cloud-top temperatures ranged from–51.9℃to–30.4℃,dust-related heterogeneous nucleation contributed to primary ice nucleation in cirrus clouds by providing ice nucleating particle concentrations on the order of 10^(−3)L^(−1)to 10^(2)L^(−1).Heterogeneous nucleation and subsequent crystal growth reduced the ambient RH_(i)to be less than 150%by consuming water vapor and thus completely inhibited homogeneous nucleation.

Cirrus Loqic推出CS4352数模音频转换器

Cirrus Logic公司推出极具竞争力的集成了丰富音频性能及功能的新型CS4352数模转换器。CS4352具有片上线路驱动器和模拟低通滤波器，有助于设计者减少平板数字电视、DVD刻录机、机顶盒、

Cirrus Logic数模转换器降低系统成本并简化消费电子产品设计

2008年10月13日，Cirrus Logic公司宣布推出24位数模转换器CS4353，拓展其领先的数字音频应用音频转换器Ic系列。CS4353是Cirrus Logic公司的第三代音频数模转换器产品，集成了2Vrms线路驱动器，并通过减少对多个系统元件的需求来简化模拟输出区间段电路设计，从而节省成本。

Comparison and interchangeability of macular thickness measured with Cirrus OCT and Stratus OCT in myopic eyes

AIMTo investigate the difference of macular thickness measurements between stratus optical coherence tomography (OCT) and Cirrus OCT (Carl Zeiss Meditec, Dublin, CA, USA) in the same myopic patient and to develop a conversion equation to interchange macular thickness obtained with these two OCT devices.METHODSEighty-nine healthy Chinese adults with spherical equivalent (SE) ranging from -1.13 D to -9.63 D were recruited. The macular thickness was measured by Cirrus OCT and Stratus OCT. The correlation between macular thickness and axial length and the agreement between two OCT measurements were evaluated. A formula was generated to interchange macular thickness obtained with two OCT devices.RESULTSAverage macular thickness measured with Stratus OCT (r=-0.280, P=0.008) and Cirrus OCT (r=-0.224, P=0.034) were found to be negatively correlated with axial length. No statistically significant correlation was found between axial length and central subfield macular thickness (CMT) measured with Stratus OCT (r=0.191, P=0.073) and Cirrus OCT (r=0.169, P=0.113). The mean CMT measured with Cirrus OCT was 53.63±7.94 µm thicker than with Stratus OCT. The formula CMTCirrus OCT=78.328+0.874×CMTStratus OCT was generated to interchange macular thickness obtained with two OCT devices.CONCLUSIONMacular thickness measured with Cirrus OCT were thicker than with Stratus OCT in myopic eyes. A formula can be used to interchange macular thickness measured with two OCT devices in myopic eyes. Studies with different OCT devices and larger samples are warranted to enable the comparison of macular values measured with different OCT devices.

Cirrus Logic推出CS44130功率级IC为数字电视和家庭影院接收器提供完整的数字放大器解决方案

Cirrus Logic公司推出CS44130功率级IC，为音频转换和数字音频放大提供了一套完整的解决方案。为了消除数字D类音频产品设计过程中的很多风险和不确定因素，Cirrus Logic还推出了用于立体声和2．1通道应用的参考设计。该参考设计达到并超过了目前音频质量的行业标准，为消费电子产品制造商提供一个完整的一站式参考解决方案。