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随着大数据的发展以及数据安全相关法规的出台，人们的隐私保护意识逐渐加强，“数据孤岛”现象愈发严重。联邦学习技术作为解决该问题的有效方法之一，已成为当下备受关注的热点。在纵向联邦学习在线推理过程中，当前的主流方法并未考虑对数据标识的保护。针对此问题，提出一种适用于纵向联邦线性模型在线推理过程中的成员推断攻击的隐私保护方法，通过构造具有假阳率的过滤器来避免对数据标识的精确定位，从而保证数据的安全性；使用同态加密实现在线推理过程的全密态，保护中间计算结果；根据同态加密的密文倍乘性质，使用随机数乘法盲化操作，保证最终推理结果的安全性。该方案进一步提高了纵向联邦学习在线推理过程中用户隐私的安全性，且具有更低的计算开销和通信开销。

目的探索本中心使用促性腺激素释放激素拮抗剂（GnRH-ant）方案促排后新鲜单囊胚移植患者妊娠失败的独立危险因素。方法回顾性分析2017年1月至2020年4月在中山大学附属第三医院生殖医学中心行助孕治疗的325个治疗周期的资料。根据妊娠结局分为临床妊娠组（172例）和未妊娠组（153例），比较两组患者间的基础资料，临床促排卵情况，胚胎发育情况，移植囊胚的分期、内细胞团（ICM）和滋养外胚层（TE）评分，将P＜0.1的变量纳入回归方程进行多因素Logistic回归分析，找出临床妊娠失败的独立危险因素。结果两组患者间的基础资料差异无统计学意义，促性腺激素（Gn）使用天数（8.9±1.3 vs. 8.6±1.2）、人绒毛膜促性腺激素（HCG）注射日的卵泡刺激素（FSH）水平（12.1±3.7 vs. 13.0±4.0）U/L、受精方式及移植囊胚的 ICM和TE评分在临床妊娠组和未妊娠组的差异有统计学意义。将P＜0.1的变量即不孕类型、受精方式、Gn使用天数、HCG注射日FSH水平、HCG注射日黄体生成素（LH）水平和移植囊胚的ICM和TE评分纳入回归模型，采用逐步法分析后发现临床妊娠失败的独立危险因素是移植囊胚的TE评分［P=0.001，OR=2.173，95%CI：（1.359，3.476）］、Gn使用时间［P=0.015，OR=0.794，95%CI：（0.659，0.955）］和受精方式［P=0.024，OR=2.065，95%CI：（1.098，3.882）］。结论本中心的数据提示≤40岁预后良好的患者使用拮抗剂促排并行新鲜单囊胚移植时，较差的滋养外胚层评分，较短的Gn使用时间和使用ICSI受精方式是临床妊娠失败的独立危险因素。

氢燃料电池汽车续航里程长、能量转换效率高，其燃料可通过可再生能源电解水制取。氢燃料电池汽车的推广应用将促进电力系统消纳不稳定的可再生能源电力。已有文献缺乏对氢燃料生产、储运等不同路径的环境影响全生命周期综合分析。考虑中国当前主要的制氢、输氢和发电技术，根据不同技术组合设计17条氢燃料路径，通过GREET软件对这些路径的生命周期环境影响进行核算。研究表明：路径3（可再生能源发电制氢+液氢槽车输氢）和路径16（可再生能源发电+输电+现场制氢）的环境影响最小，低于纯电动车路径（混合发电+锂离子电动车）和汽油内燃机车路径的环境影响。未来需要进一步降低可再生能源发电制氢的成本，提升这些路径的经济性，从而推动燃料电池汽车低环境影响路径的应用。

为了获悉苏州太平金融高层格构式树形柱的轴压性能和破坏机理,对格构式树形柱缩尺试件展开了轴压试验研究。试验结果表明,格构式树形柱的轴压受力性能良好,试件破坏主要集中在分肢柱弯头处。利用ABAQUS有限元软件建立了格构式树形柱的数值分析模型,通过破坏模式和荷载-位移曲线验证了有限元分析模型的准确性。针对格构式树形柱在较大轴压荷载作用下分肢柱弯头处破坏的情况,提出了提高十字拉结梁高度、设置纵向隔板、填充混凝土等3种构造加强措施,并通过有限元分析验证了其改善效果。研究表明,在分肢柱弯头处提高十字拉结梁的方式可以有效提高格构式树形柱的刚度和轴压极限承载力,显著改善其受力性能,可以在实际工程中推广使用。

针对啁啾（Chirp）信号参数估计的高复杂度和在低信噪比（SNR）下保持高精度等问题,文章提出了一种改进的Chirp信号参数估计算法。该算法根据当信号能量和周期长度一定时Chirp信号频谱幅度的平方与调频率成反比的特性,不断地产生已知Chirp信号的共轭与未知Chirp信号相乘,找到使相乘后频谱幅度平方最大的已知Chirp信号的调频率。为了做到参数估计的高精度,用修正的幅度插值（M-Rife）算法估计中心频率和修正相乘后信号频谱的幅值。将该算法与短时傅里叶变换（STFT）结合,首先用STFT估计出调频率的大致范围和信号周期,然后用二分法代替等步长使改进的Chirp信号参数估计算法在这个大致范围内搜索,极大地降低了计算复杂度。实验结果表明,在SNR≥-10 dB时,该算法估计调频率归一化均方误差（NMSE）要优于分数阶傅里叶变换（FRFT）约1～2 dB,接近克拉美罗下界（CRLB）。

针对分数阶傅里叶变换（FRFT）对啁啾（Chirp）信号进行盲检测时存在运算量大的问题,文章提出一种针对Chirp信号参数估计的盲检测方法。首先利用改变窗长相位差法对Chirp信号进行粗估计,并利用最小二乘法进行拟合得到Chirp信号调频斜率粗估计值,然后通过FRFT对Chirp信号进行精细估计,并利用二分法对FRFT的阶次进行搜索,进一步降低算法的运算量。仿真结果表明,利用改变窗长相位差法和FRFT联合检测Chirp信号的方法,在低信噪比下具有较高精度的估计值,且其归一化均方误差接近克拉美罗下界,并且与FRFT穷举检测相比,极大地减少了运算量,具有很好的工程应用意义。

针对新疆等地域辽阔地区的电力光缆难以运维的难题,文章提出在光纤自动交换技术和光功率放大技术的基础上,对几种超长程光路补偿、切换和在线监测方案进行模拟,进而提出了超长程光缆主备光纤调度及测试的有效方案。结果表明,该方案适用于超长程光缆调度与监测,可为未来超长程光缆网络智能运维系统的构建奠定基础。

搭建一个双向拉曼放大超长跨距光纤传输系统,在接收端采用非线性补偿算法来补偿因传输距离长和入纤光功率高所带来的光纤非线性效应,并通过实验成功实现了10Gbaud/s 16正交幅度调制（QAM）信号的传输,传输距离为300km。仿真和实验结果表明,通过采用非线性补偿算法,接收端信号的性能相比未使用非线性补偿算法时提高了2dB。证明了非线性补偿技术在超长跨距光纤传输系统中是非常有效且必要的。

根据自由空间光通信的特点 ,在理论分析和数值仿真的基础上提出了适用于星间光通信的长波长光发送机方案 .针对星间光通信对误码率的要求分析了大信号、高泵浦功率条件下 EDFA中放大的自发辐射 （ ASE）对系统信噪比增益的影响并通过计算给出了在 OOK调制方式下光发送机天线口径的最优范围

【目的】 探讨入肝门静脉动脉化加门腔分流术对肝硬化大鼠肝功能的影响.【方法】 125只肝硬化大鼠随机分为A组(n=50),入肝门静脉完全动脉化+门腔分流;B组(n=50),仅行门腔完全分流;C组(n=25),门静脉阻断30 min+右肾切除,分别检测各组大鼠术前、术后1、2、4及8周血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、总胆红素(TB)、白蛋白(ALB)及吲哚氰氯15 min潴留率(ICGR15).【结果】 术前各组大鼠血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、总胆红素(TB)、白蛋白(ALB)及ICGR15无明显差异(P>0.05);术后随着时间推移 ,A组大鼠的ALT、TB、AST及ICGR15较B、C两组均有明显降低,差异有明显统计学意义(AST:P

青光眼是一种常见致盲眼病,我国原发性青光眼的患病率约为0.21%～1.75％,40岁以上人群患病率为1.40％。因青光眼致盲的人数占全体盲人的5.3％～21％。根据作者对1503例住院青光眼病人的统计,各类原发性青光眼的致盲率均略高于30％。因此青光眼的早期诊断,早期治疗及其发病机理的研究,对防盲治盲工作有重要意义。

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Introducing phase change energy storage materials classification standard, including chemical composition, phase change mechanism and phase change temperature・ And summarizes the research progress of phase change energy storage materials in recent years; this paper also summarizes the typical application fields of phase change energy storage materials, including construction field, cold chain logistics and military textiles, the research prospect of phase change energy storage materials is put forward. [ABSTRACT FROM AUTHOR]

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本文综述了波分复用技术在宽带光纤网络中的应用，及ＷＤＭ网络的结构分类和性能特点，并具体介绍了几个ＷＤＭ网络实验。

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After nearly 20 years of exploitation, the reserves of Tuwaishan Gold Deposit have significantly decreased, necessitating exploration to increase reserves. By analyzing the regional metallogenic background and the geological characteristics of the mining area and deposit, it was found that the northeast-trending Gezhen fault controls the distribution of the gold deposit. The Tuwaishan Gold Deposit is divided into 4 ore zones from west to east. The ore bodies are controlled by secondary faults in the hanging wall of Gezhen fault. The barren intervals between ore bodies range from 10 m to 50 m, while the barren intervals along the strike of individual ore bodies range from 40 m to 80 m. The ore bodies are jointly controlled by multiple sets of northeast-trending faults, showing a rhombus grid pattern and reflecting the ore-hosting characteristics at fault intersections. Based on the characteristics and occurrence patterns of 3 delineated ore-hosting columns, the fourth rich ore column is predicted between Exploration Line 10 and 12. Low-grade thin ore bodies and mineralization, as well as small lenticular rich ore bodies, are found between the rich ore columns. According to the approximately equidistant distribution of ore-controlling structures, the lateral extension of ore bodies and the lateral angle, and the segmented enrichment patterns of ore bodies vertically, altered rock type ore bodies can be sought in different enriched ore sections. [ABSTRACT FROM AUTHOR]

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