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中山大学学报（自然科学版）（中英文） 2024年第1期63卷 96-104页

作者：许源兴孙琰肖鹤艾彬刘大召广东海洋大学电子与信息工程学院广东湛江524088 中山大学海洋科学学院广东珠海519082 南方海洋科学与工程广东省实验室(珠海) 广东珠海519082 广东省海洋遥感与信息技术工程技术中心广东湛江524088

为实现珠江口高分辨率赤潮遥感识别,科学支撑赤潮灾害防灾减灾工作,利用海洋一号C/D卫星搭载的海岸带成像仪高空间分辨率数据,在分析珠江口近岸浑浊水体、干净水体和赤潮水体遥感影像光谱特征基础上,通过计算水体色相角并结合目视解译... 详细信息

为实现珠江口高分辨率赤潮遥感识别,科学支撑赤潮灾害防灾减灾工作,利用海洋一号C/D卫星搭载的海岸带成像仪高空间分辨率数据,在分析珠江口近岸浑浊水体、干净水体和赤潮水体遥感影像光谱特征基础上,通过计算水体色相角并结合目视解译识别珠江口赤潮。利用该方法成功识别2020年10月26日—11月6日在珠江口海域发生的双胞旋沟藻赤潮。利用色相角能够很好地识别出珠江口海域的赤潮;赤潮水体的色相角在58°~61°变化;该方法对形成初期的小范围赤潮、低密度赤潮和条带状赤潮具有很好的识别效果。

关键词：珠江口赤潮 HY-1C/D 色相角

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超声处理对‘烟73’干红葡萄酒颜色的影响

中外葡萄与葡萄酒 2024年第2期 56-62页

作者：魏滨生李超王家琪房玉林孙翔宇烟台张裕集团陕西张裕瑞那城堡酒庄陕西西安712042 西北农林科技大学葡萄酒学院陕西杨凌712100

近年来,超声技术已在液体食品中得到了广泛应用。本文探究了一次性超声破碎(OU)和一次性超声水浴(OUB)处理后高花色苷‘烟73’干红葡萄酒颜色的变化及对酚类等物质的影响。结果表明,OU和OUB处理后葡萄酒颜色发生显著变化,颜色强度降低,... 详细信息

近年来,超声技术已在液体食品中得到了广泛应用。本文探究了一次性超声破碎(OU)和一次性超声水浴(OUB)处理后高花色苷‘烟73’干红葡萄酒颜色的变化及对酚类等物质的影响。结果表明,OU和OUB处理后葡萄酒颜色发生显著变化,颜色强度降低,色调升高,Red%值显著下降,Yellow%值和Blue%值显著上升,整体向紫红色方向演变;超声处理有效减缓了红葡萄酒颜色的褐变,显著提升了聚合色素含量,有利于葡萄酒颜色的稳定。同时,超声处理降低了钙离子、总酚和总花色苷含量,增加了铁离子和单宁含量。整体来说,OU处理对红葡萄酒颜色的影响高于OUB处理,表明超声破碎是加快葡萄酒陈酿和感官改善的有效方式。

关键词：超声破碎超声水浴花色苷颜色催陈

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生物炭包膜尿素的制备及其固氮潜力的研究

节水灌溉 2024年第1期 121-127页

作者：王杰孙程万郭建华宁建凤倪振宇王弯弯河北工程大学水利水电学院河北邯郸056038 河北省智慧水利重点实验室河北邯郸056038 广东省农业科学院农业资源与环境研究所广州510640

为了探究生物炭包膜尿素的缓释性能及对土壤固氮的影响,以300、500和700℃下制备的杨木生物炭为包膜材料制备了3种生物炭包膜尿素,采用间歇土柱淋溶试验对氮素的释放特征进行分析。结果表明,杨木生物炭对铵态氮和硝态氮具有较好的吸附性... 详细信息

为了探究生物炭包膜尿素的缓释性能及对土壤固氮的影响,以300、500和700℃下制备的杨木生物炭为包膜材料制备了3种生物炭包膜尿素,采用间歇土柱淋溶试验对氮素的释放特征进行分析。结果表明,杨木生物炭对铵态氮和硝态氮具有较好的吸附性能,低温下制备的生物炭对铵态氮吸附效果更好;与尿素相比,施用生物炭包膜尿素土壤的总氮淋溶量减少了9.73%~14.67%,铵态氮淋溶量减少了25.28%~30.36%,硝态氮淋溶量减少了10.34%~18.38%;在同等施氮水平下,生物炭包膜尿素相较于尿素可以显著增加土壤铵态氮和硝态氮的含量。其中,土壤中铵态氮含量增加了66.4%~200.1%,土壤硝态氮的含量增加了477.9%~537.6%。因此,生物炭用作肥料的包膜材料具有广阔的应用前景。

关键词：生物炭包膜尿素土柱淋溶铵态氮硝态氮

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桃果皮叶绿素降解规律与相关基因表达分析

果树学报 2024年第6期41卷 1054-1063页

作者：刘鑫张晓煜孟君仁段文宜孙世航潘磊曾文芳王志强牛良中国农业科学院郑州果树研究所·国家桃、葡萄改良中心郑州450009 中国农业科学院中原研究中心河南新乡453004

【目的】探究桃果皮叶绿素降解规律及叶绿素降解相关基因的表达情况,以期为桃果实成熟期及底色差异判定确定依据。【方法】以春美、2-50等不同桃品种/品系为研究对象,测量成熟前桃果实色差、叶绿素含量等指标,用荧光定量PCR检测叶绿素... 详细信息

【目的】探究桃果皮叶绿素降解规律及叶绿素降解相关基因的表达情况,以期为桃果实成熟期及底色差异判定确定依据。【方法】以春美、2-50等不同桃品种/品系为研究对象,测量成熟前桃果实色差、叶绿素含量等指标,用荧光定量PCR检测叶绿素降解相关基因的表达情况,通过分析叶绿素与相关基因表达的关系,确定影响桃果皮叶绿素降解的关键因素。【结果】桃果实成熟前30 d叶绿素含量降低与PpCLH2、PpSGRL高表达有关。PpCLH1基因在桃果实转色时表达量升高。在果实成熟前8~0 d,果皮叶绿素降解,PpSGR基因表达量上调。PpSGR基因表达情况与春美、2-50、中桃7号的叶绿素含量呈显著负相关,是导致桃果实成熟时叶绿素降解的关键基因。【结论】成熟前12~8 d是桃果皮关键转色期,PpSGR可能是桃果实成熟前果皮叶绿素降解的关键基因,这对进一步解析桃果实发育过程中果皮叶绿素降解机制提供了一种新的思路,也为探索桃果实发育过程中叶绿素降解的分子机制提供参考。

关键词：桃果皮叶绿素降解 PpCLH1基因 PpSGR基因

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基于分布式驱动汽车的分层式控制系统设计

技术与市场 2024年第4期31卷 17-22页

作者：段泽昊李毅王海洋孙扬河北工程大学机械与装备工程学院河北邯郸056000 河北省智能工业装备技术重点实验室河北邯郸056000 邯郸市智能车辆重点实验室河北邯郸056000 冀中能源峰峰集团有限公司河北邯郸056000

目前汽车之所以没有广泛采用轮毂电机驱动车轮,其一是考虑成本,其二是轮毂电机的搭载大大增加了簧下质量,对车辆行驶过程中的操纵稳定性有较大影响。以分布式驱动汽车为研究对象,设计分层式控制系统:上层控制器对车辆总横向运动进行解... 详细信息

目前汽车之所以没有广泛采用轮毂电机驱动车轮,其一是考虑成本,其二是轮毂电机的搭载大大增加了簧下质量,对车辆行驶过程中的操纵稳定性有较大影响。以分布式驱动汽车为研究对象,设计分层式控制系统:上层控制器对车辆总横向运动进行解耦控制,其中纵向采用PID控制跟踪纵向车速,横向设计滑模控制器计算所需方向盘转角;中间层采用模糊控制计算维持车辆行驶稳定性所需附加横摆力矩;底层以轮胎附着利用率为优化目标对力矩进行最优分配。对比仿真试验表明:分层式控制系统可有效降低车辆行驶过程中的横摆角速度16%~48%,质心侧偏角62%~67%,抑制了实际值与理想值之间的偏差,提高了车辆在行驶过程中的安全性和舒适性。

关键词：分布式驱动汽车分层式控制滑模控制模糊控制最优分配

Non-destructive detection of tea stalk and insect foreign bodies based on THz-TDS combination of electromagnetic vibration feeder

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Food Quality and Safety 2023年第2期7卷 300-308页

作者： Xudong sun Chao Xu Chagen Luo Dongfu Xie Wei Fu Zhiyuan Gong Xinpeng Wang School of Mechatronics and Vehicle Engineering East China Jiaotong UniversityNanchangChina Key Laboratory of Conveyance Equipment(East China Jiaotong University) Ministry of EducationNanchangChina Nanchang Automotive Institute of Intelligence and New Energy(Tongji University) NanchangChina

Background and objectives:Current technology of X-ray imaging can recognize hard foreign materials(FMs)such as metal and high-density ***,low-density foreign bodies are still a challenge for food quality and safety *** and methods:An electromagnetic vibration feeder aided by terahertz time-domain spectroscopy(THz-TDS)and imaging was inves-tigated for non-destructively detecting tea stalk and insect FMs mixed with tea ***:THz time-domain signals were employed directly to develop the K-nearest neighbor model with a precision of 100%,accuracy of 95.6%and recall of 98.7%in predicting the unknown *** contrast THz-TDS images were obtained by the separation method for the samples using electromagnetic vibration *** characteristic parameters of the ratio of maximum length(L)to maximum width(W)and hue extracted from THz-TDS images indicated significant difference between tea leaves and ***:The results suggested that electromagnetic vibration feeder combination with THz-TDS was feasible for detecting FMs in fin-ishingteaproducts.

关键词： Terahertz spectroscopy imaging food foreign bodies

Intelligent optimization of seam-line finding for orthophoto mosaicking with LiDAR point clouds

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第5期12卷 417-429页

作者： Hong-chao MA Jie sun School of Remote Sensing Wuhan University Wuhan 430079 China State Key Lab for Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China

A detailed study was carried out to find optimal seam-lines for mosaicking of images acquired by an airborne light detection and ranging (LiDAR) *** ground objects labeled as obstacles can be identified by delineating black holes from filtered point clouds obtained by filtering the raw laser scanning *** innovative A algorithm is proposed that can automatically make the seam-lines keep away from these obstacles in the registered *** method can intelligently optimize the selection of seam-lines and improve the quality of orthophotos.A simulated grid image was first used to analyze the effect of different heuristic functions on path *** subsets of LiDAR data from Xi'an,Dunhuang,and changyang in Northwest China were obtained.A quantitative method including pixel intensity,hue,and texture was *** our proposed method,9.4%,8.7%,and 9.8% improvements were achieved in Dunhuang,Xi'an,and changyang,respectively.

关键词： Light detection and ranging (LiDAR) Filter A algorithm Mosaicking Seam-line

C<sub>16</sub>Saturated Fatty Acid Induced Autophagy in A549 Cells through Topoisomerase I Inhibition

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Food and Nutrition Sciences 2012年第9期3卷 1220-1227页

作者： Sandeep Karna Won Bong Lim Ji sun Kim Sang Woo Kim Hui Zheng Kum hue Bae Min sung Cho Hee Kyun Oh Ok Su Kim Hong Ran Choi Ok Joon Kim Department of Oral & Maxillofacial Surgery Chonnam National University Dental Hospital Bug-Gu Gwangju Korea Department of Oral Pathology School of Dentistry Chonnam National University Bug-Gu Gwangju Korea Department of Periodontology School of Dentistry Chonnam National University Bug-Gu Gwangju Korea

C16 saturated fatty acid (Palmitic acid) is one of the most common dietary fatty acids which played an important role in the cellular biological functions. Palmitic acid (PA) was tested for potential inhibition of DNA topoisomerase I (topo I) and it exhibited inhibitory activity in the nanomolar range. Treatment of lung adenocarcinoma cell line A549 with PA resulted in a decrease in cell viability in a concentration-dependent manner, and PA showed cytotoxicity with an IC50 value of 150 μM. DNA fragmentation assay and caspase activity indicated that PA does not induce apoptotic cell death in A549 cells. Finally, we found that PA was able to cause an increase in autophagic flux in a time-dependent manner, evidenced by the accumulation of LC3 through monodansylcadaverine (MDC) staining. More importantly, inhibition of autophagy by blocking autophagosome formation via the inhibition of type III Phosphatidylinositol 3-kinases (PI-3K), by 3-Methyladenine (3-MA) was able to effectively suppress PA-induced autophagy. We showed that inhibition of autophagy sensitized the cells signal to PA-induced apoptosis, suggesting the pro-survival function of autophagy induced by PA. Taken together, results from this study reveal that PA as a topo I inhibitor induced autophagic cell death in A549 cells.

关键词： Palmitic Acid (PA) Topoisomerase I Monodansylcadaverine (MDC) 3-Methyladenine (3-MA) Autophagy

Single Image Dehazing with V-transform and Dark channel Prior

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Journal of Systems Science and Information 2020年第2期11卷 185-194页

作者： Xiaochun WANG Xiangdong sun Ruixia SONG College of Sciences Beijing Forestry UniversityBeijing 100083China College of Sciences North China University of TechnologyBeijing 100144China

Single image dehazing algorithm based on the dark channel prior may cause block effect and color *** improve these limitations,this paper proposes a single image dehazing algorithm based on the V-transform and the dark channel prior,in which a hazy RGB image is converted into the HSI color space,and each component H,I and S is processed *** hue component H remains unchanged,the saturation component S is stretched after being denoised by a median *** the procession of intensity component,a quad-tree algorithm is presented to estimate the atmospheric light,the dark channel prior and the V-transform are used to estimate the transmission *** reduce the computational complexity,the intensity component I is decomposed by the V-transformfirst,coarse transmission map is then estimated by applying the dark channel prior on the low frequency reconstruction image,and the guided filter is finally employed to refine the coarse transmission *** images with sky regions,the haze removal effectiveness can be greatly improved by just increasing the minimum value of the transmission *** proposed algorithm has low time complexity and performs well on a wide variety of *** recovered images have more nature color and less color distortion compared with some state-of-the-art methods.

关键词： dark channel prior image haze removal HSI color space quad-tree V-transform