基于鲁棒M估计协方差矩阵相位优化的DSInSAR矿区形变监测研究

针对时序干涉合成孔径雷达(Interferometric Synthetic Aperture Radar,InSAR)技术在矿区所处区域内耕地、裸地等自然地表地物上无法识别有效监测点信息,致使矿区地表形变信息不足及形变解译困难等问题,提出一种基于鲁棒M估计协方差矩阵特征值分解相位优化的DSInSAR技术,并基于34景Sentinel-1A影像获取了霄云煤矿2022年的地表时序形变。推导基于鲁棒M估计协方差矩阵估计公式,提高对样本异常值及异质像素的鲁棒性,开展基于鲁棒M估计协方差矩阵特征值分解的相位优化处理,分析了上述优化模型与通用相位优化模型的相似性,最终通过对优化估计相位开展相位信息解译处理来获取最终的形变信息。实验结果表明:基于鲁棒M估计协方差矩阵特征值分解相位优化的DSInSAR技术较常规SBAS技术及基于最大似然估计协方差矩阵的DSInSAR技术在监测点密度上分别提高了约11.4倍、0.2倍,且与水准数据对比具有最小的均方根误差,约22 mm;此外,霄云煤矿共包含三个主要形变场,其地表沉降的时序变化呈现出较显著的非线性趋势,煤矿内地表的视线向最大沉降量约418 mm。研究成果为矿区地表形变规律反演及矿区灾害防控提供重要数据支撑。

腹腔镜肝癌切除术后联合槐耳颗粒和仑伐替尼对预防肿瘤复发/转移的价值

目的探讨肝癌患者经腹腔镜肝切除术(laparoscopic hepatectomy,LH)后联合槐耳颗粒和仑伐替尼对预防肿瘤复发/转移的价值。方法回顾性分析2017年1月—2021年6月福建省莆田市第一医院肝胆胰脾外科行LH的患者94例的临床资料,按随机数表法分为观察组和对照组,各47例。对照组采用仑伐替尼进行靶向治疗,观察组在对照组基础上联合槐耳颗粒,对比两组近期复发与转移情况、炎症水平、肿瘤标志物和血清因子水平、免疫反应和不良反应。结果观察组的复发率为8.51%,较对照组的25.53%更低,差异有统计学意义(χ^(2)=4.821,P=0.028);观察组C反应蛋白(CRP)、白细胞介素-1(IL-1)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、甲胎蛋白(AFP)、异常凝血酶原(DCP)、Toll样受体4(TLR4)、CD3^(+)、CD8^(+)水平较对照组更低,CD4^(+)、CD4^(+)/CD8^(+)水平更高,差异有统计学意义(P<0.05)。两组肝外转移率和不良反应发生率比较,差异无统计学意义(P>0.05)。结论经LH后采用槐耳颗粒联合仑伐替尼进行后续治疗,可有效降低术后1年内复发率,提高机体免疫应答,缓解机体炎症反应,发挥肿瘤抵抗作用,且具有较高安全性。

干旱半干旱区采煤沉陷引起的土壤水分变化及其对植物生理生态潜在影响分析综述

土壤水分是限制植物生长的关键因子。采煤沉陷导致地表形成裂缝,加上地下水位降低,使得干旱半干旱区本就很低的土壤含水量进一步降低。当土壤含水量低于植物干旱胁迫阈值时,势必会影响植物的生理生态。本文分析了采煤沉陷对水环境的影响,综述了当土壤含水量低于植物干旱胁迫阈值时,植物生理生态指标,包括叶片与根系形态结构、光合生理指标、渗透调节物质、水分生理指标、抗氧化酶活性、抗旱蛋白含量和组分等的潜在变化。未来应加强对干旱半干旱区土壤水分与植物生理生态协同变化的监测,致力于揭示植物生理生态对采煤沉陷引起的土壤水分变化的响应机制;同时,加强干旱半干旱区煤炭开采对植被生理生态影响的预测模型的研究。

Effect of Different Dietary Protein and Lipid Levels on the Growth,Body Composition,and Intestinal Digestive Enzyme Activities of Juvenile Yellow Drum Nibea albiflora(Richardson)

An 8-week feeding trial was conducted to determine the optimal dietary protein-to-lipid ratio for juvenile Nibea albiflora with an initial weight of(11.76 ± 0.20) g.Nine experimental diets containing different concentrations of protein(40%,47%,or 54%) and lipids(5%,9%,or 13%) in a 3 × 3 factorial experimental design were tested in triplicate groups of fish,while the protein-to-energy(P/E) ratios of the diets varied in the range of 19.74–28.32 mg k J^(-1).Results showed that fish fed diets containing 9% or 13% lipids with 54% protein exhibited significantly higher weight gains and specific growth rates than those fed other diets.The feed conversion rate of fish fed the diet with 40% protein and 5% lipids was significantly poorer than that of fish fed other diets.The protein efficiency rate of fish fed diets with 5% lipids was significantly lower than that of fish fed 9% or 13% lipid diets.Carcass lipid and energy contents were positively correlated with dietary lipid level regardless of protein level.Fish fed a 54% protein diet showed the highest trypsin activity.The intestinal lipase activity of fish fed the diet containing 13% lipids was significantly higher than that of fish fed 5% or 9% lipid diets.These results demonstrate the high protein dietary requirements of N.albiflora.A diet containing 54% protein and 9%–13% lipids with a P/E ratio of 26.2–27.81 mg protein k J^(-1) can be considered optimal for juvenile N.albiflora.

Numerical Study of the Three Gorges Dam Influences on Chlorophyll-a in the Changjiang Estuary and the Adjacent East China Sea

The impoundment of the Three Gorges Dam(TGD)has altered downstream hydrological characteristics and sediment discharge,and it has caused ecological impacts,such as changes in chlorophyll-a(Chl-a)in estuaries and coastal oceans.To investigate the TGD's influence on Chl-a's interannual and seasonal variations in the Changjiang Estuary and the adjacent coastal East China Sea,a physical-biogeochemical model was developed with numerical experiments covering a decade,including TGD's preperiod(pre-TGD,1999–2003)and post-period(post-TGD,2004–2008).The modeling results demonstrate an annual increase in the regional average Chl-a from pre-to post-TGD,with the largest increase reaching up to 20.8%in spring in the nearshore region beyond the Changjiang mouth.The spatial variations in Chl-a are high,with the largest variation being observed around the 20–40 m isobaths.The increase in Chl-a is influenced by improved light and nutrient conditions,which is attributed to dam construction and fertilization by human activities.A decline in nitrogen-phosphorus fertilizer usage ratio along the Changjiang River watershed after the TGD's impoundment is another factor that influences the Chl-a's variation.The modeling results also show severe NO3 and PO4 imbalances with a larger N/P ratio during the post-TGD period,especially in regions with large Chl-a increases.Moreover,the greater increase in the usage of phosphorus fertilizer than nitrogen fertilizer influences Chl-a's variation and has potential promotion effects on the outbreak of harmful algal bloom events.

纸筒灌装产品生产线下料装置结构设计

针对某企业纸筒灌装产品的自动化生产,设计了一种全自动化的下料搬运装置,来完成纸筒灌装产品的下料任务。基于SolidWorks软件完成了对下料装置的整体结构设计。介绍了装置的工作流程和原理,并对其中关键组件的设计进行了阐述。在实际生产中,该机构能够正确地完成对纸筒产品的下料任务,使纸筒从垂直姿态变为水平姿态,并保证圆柱形产品头尾一致有序排列。