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Analysis of the joint detection capability of the SMILE satellite and EISCAT-3D radar

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Earth and Planetary Physics 2024年第1期8卷 299-306页

作者： jiaojiao zhang TianRan Sun XiZheng Yu DaLin Li Hang Li JiaQi Guo ZongHua Ding Tao Chen Jian Wu Chi Wang State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China Key Laboratory of Solar Activity and Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 101408China Key Laboratory of Electronics and Information Technology for Space Systems Chinese Academy of SciencesBeijing 100190China China Research Institute of Radio-wave Propagation Qingdao 266075China

The Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)satellite is a small magnetosphere–ionosphere link explorer developed cooperatively between China and Europe.It pioneers the use of X-ray imaging technology to perform large-scale imaging of the Earth’s magnetosheath and polar cusp regions.It uses a high-precision ultraviolet imager to image the overall configuration of the aurora and monitor changes in the source of solar wind in real time,using in situ detection instruments to improve human understanding of the relationship between solar activity and changes in the Earth’s magnetic field.The SMILE satellite is scheduled to launch in 2025.The European Incoherent Scatter Sciences Association(EISCAT)-3D radar is a new generation of European incoherent scatter radar constructed by EISCAT and is the most advanced ground-based ionospheric experimental device in the high-latitude polar region.It has multibeam and multidirectional quasi-real-time three-dimensional(3D)imaging capabilities,continuous monitoring and operation capabilities,and multiple-baseline interferometry capabilities.Joint detection by the SMILE satellite and the EISCAT-3D radar is of great significance for revealing the coupling process of the solar wind–magnetosphere–ionosphere.Therefore,we performed an analysis of the joint detection capability of the SMILE satellite and EISCAT-3D,analyzed the period during which the two can perform joint detection,and defined the key scientific problems that can be solved by joint detection.In addition,we developed Web-based software to search for and visualize the joint detection period of the SMILE satellite and EISCAT-3D radar,which lays the foundation for subsequent joint detection experiments and scientific research.

关键词： Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)satellite European Incoherent Scatter Sciences Association(EISCAT)-3D radar joint detection

Postharvest Variations of Rice Physicochemical Traits and Volatile Compounds under Granary Conditions During Long-Time Storage

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Rice science 2023年第2期30卷 92-95,I0007-I0009页

作者： HU Hao LIU Xingquan HE Yukai JIN Jiande WU Fenghua HUANG Shiwen zhang jiaojiao College of Food and Health Zhejiang Agriculture and Forest UniversityHangzhou 311300China China National Rice Research Institute Hangzhou 310006China Zhejiang Province Grain Reserve Management Co.LTD Hangzhou 310006China

Rice quality is influenced by many factors,viz.,temperature,humidity,atmosphere and storage time.To uncover quality variations of rice after postharvest,we estimated the physicochemical properties and volatile compounds of an indica rice Zhongzheyou 8 under granary conditions(20ºC-25ºC in summer and 10ºC-15ºC in other seasons)for three years.

关键词： Traits humidity harvest

Intelligent Diagnosis of Short Hydraulic Signal Based on Improved EEMD and SVM with Few Low-dimensional Training Samples

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Chinese Journal of Mechanical Engineering 2016年第2期29卷 396-405页

作者： zhang Meijun TANG Jian zhang Xiaoming zhang jiaojiao Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing 210007 China Nanjing University of Aeronautics and Astronautics Nanjing 210007 China

The high accurate classification ability of an intelligent diagnosis method often needs a large amount of training samples with high-dimensional eigenvectors, however the characteristics of the signal need to be extracted accurately. Although the existing EMD（empirical mode decomposition） and EEMD（ensemble empirical mode decomposition） are suitable for processing non-stationary and non-linear signals, but when a short signal, such as a hydraulic impact signal, is concerned, their decomposition accuracy become very poor. An improve EEMD is proposed specifically for short hydraulic impact signals. The improvements of this new EEMD are mainly reflected in four aspects, including self-adaptive de-noising based on EEMD, signal extension based on SVM（support vector machine）, extreme center fitting based on cubic spline interpolation, and pseudo component exclusion based on cross-correlation analysis. After the energy eigenvector is extracted from the result of the improved EEMD, the fault pattern recognition based on SVM with small amount of low-dimensional training samples is studied. At last, the diagnosis ability of improved EEMD＋SVM method is compared with the EEMD＋SVM and EMD＋SVM methods, and its diagnosis accuracy is distinctly higher than the other two methods no matter the dimension of the eigenvectors are low or high. The improved EEMD is very propitious for the decomposition of short signal, such as hydraulic impact signal, and its combination with SVM has high ability for the diagnosis of hydraulic impact faults.

关键词： hydraulic impact fault improved EEMD end effect overshoot-undershoot SVM intelligent fault diagnosis short signal

Pricing Credit Derivatives Under Fractional Stochastic Interest Rate Models with Jumps

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Journal of Systems Science & Complexity 2017年第3期30卷 645-659页

作者： zhang jiaojiao BI Xiuchun LI Rong zhang Shuguang School of Mathematical Sciences Xiamen UniversityXiamen 361005China School of Management University of Science and Technology of ChinaHefei 230022China

Based on the reduced-form approach, this paper investigates the pricing problems of default-risk bonds and credit default swaps(CDSs) for a fractional stochastic interest rate model with jump under the framework of primary-secondary. Using properties of the quasi-martingale with respect to the fractional Brownian motion and the jump technique in Park(2008), the authors first derive the explicit pricing formula of defaultable bonds. Then, based on the newly obtained pricing formula of defaultable bonds, the CDS is priced by the arbitrage-free principle. This paper presents an extension of the primary-secondary framework in Jarrow and Yu(2001).

关键词： CDS 部分 Brownian 运动主要第二等的框架还原剂形式途径

Improved method to derive equivalent current systems from global MHD simulations

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Science China Earth Sciences 2014年第1期57卷 167-173页

作者： zhang jiaojiao WANG Chi TANG BinBin State Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences University of Chinese Academy of Sciences

Derivation of equivalent current systems(ECS)from a global magnetospheric magnetohydrodynamics(MHD)model is very useful in studying magnetosphere-ionosphere coupling,ground induction effects,and space weather forecast.In this study we introduce an improved method to derive the ECS from a global MHD model,which takes account of the obliqueness of the magnetic field lines.By comparing the ECS derived from this improved method and the previous method,we find that the main characteristics of the ECS derived from the two methods are generally consistent with each other,but the eastward-westward component of the geomagnetic perturbation calculated from the ECS derived from the improved method is much stronger than that from the previous method.We then compare the geomagnetic perturbation as a function of the interplanetary magnetic field(IMF)clock angle calculated from the ECS derived from both methods with the observations.The comparison indicates that the improved method can improve the performance of the simulation.Furthermore,it is found that the incomplete counterbalance of the geomagnetic effect produced by the ionospheric poloidal current and field-aligned current(FAC)contributes to most of the eastward-westward component of geomagnetic perturbation.

关键词：等效电流体系 MHD模型电离层耦合模拟空间天气预报地磁扰动 ECS 磁流体力学

脑得生丸联合阿加曲班治疗急性脑梗死的临床研究

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现代药物与临床 2024年第3期39卷 627-631页

作者：张娇娇鲁兵张波淮南市新华医疗集团新华医院神经内科安徽淮南232000

目的探讨脑得生丸联合阿加曲班治疗急性脑梗死的临床疗效。方法选取2021年1月至2022年12月淮南市新华医疗集团新华医院收治的106例急性脑梗死患者,按随机数字表法分为对照组和治疗组,每组各53例。对照组静脉滴注阿加曲班注射液,先以2.5 ... 详细信息

目的探讨脑得生丸联合阿加曲班治疗急性脑梗死的临床疗效。方法选取2021年1月至2022年12月淮南市新华医疗集团新华医院收治的106例急性脑梗死患者,按随机数字表法分为对照组和治疗组,每组各53例。对照组静脉滴注阿加曲班注射液,先以2.5 mg/h的速率持续静脉内泵入,连续用药48 h;之后调整为10 mg/次,每次间隔12 h,每次给药时间≥3 h,连续5 d;阿加曲班的总治疗时间为7 d,其用药结束后对患者继续实施常规对症治疗。治疗组在对照组治疗基础上口服脑得生丸,2 g/次,3次/d。两组连续治疗14 d。观察两组的临床疗效,比较治疗前后神经功能缺损情况、血栓弹力图指标及凝血功能指标。结果治疗后,治疗组总有效率是94.34%,显著高于对照组的81.13%(P<0.05)。治疗后,两组患者美国国立卫生研究院卒中量表(NIHSS)评分均显著低于同组治疗前(P<0.05),且治疗组治疗3、7、14 d后NIHSS评分均低于同期对照组(P<0.05)。治疗后,两组患者凝固角(Angle)、凝血综合指数(CI)、血栓最大强度(MA)均较治疗前显著降低,而凝血反应时间(R)升高(P<0.05);治疗后,治疗组Angle、CI、MA均低于对照组,而R值高于对照组(P<0.05)。治疗后,两组纤维蛋白原(FIB)、D-二聚体(D-D)、纤维蛋白降解产物(FDP)均较治疗前显著降低,而抗凝血酶Ⅲ(AT-Ⅲ)显著升高(P<0.05);治疗后,治疗组FIB、D-D、FDP均低于对照组,而AT-Ⅲ高于对照组(P<0.05)。结论脑得生丸联合阿加曲班治疗急性脑梗死可取得较好的效果,可有效逆转患者体内高凝状态、抑制血栓形成,对减轻神经损伤具有十分重要的作用,且安全性好,值得临床推广应用。

关键词：脑得生丸阿加曲班注射液急性脑梗死美国国立卫生研究院卒中量表评分凝固角凝血综合指数血栓最大强度凝血功能

保留睑板前眼轮匝肌睑缘切口内固定法重睑术的临床应用

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中华整形外科杂志 2024年第5期40卷 537-544页

作者：麻慧菱蔡秀秀张姣姣长沙爱思特医疗美容医院整形美容外科长沙410000

目的对保留睑板前眼轮匝肌睑缘切口内固定法重睑术进行改良,并探讨其临床应用效果。方法回顾性分析2021年8月至2023年8月于长沙爱思特医疗美容医院行保留睑板前眼轮匝肌睑缘切口内固定法重睑术的患者临床资料。沿上睑设计的2条去皮线切... 详细信息

目的对保留睑板前眼轮匝肌睑缘切口内固定法重睑术进行改良,并探讨其临床应用效果。方法回顾性分析2021年8月至2023年8月于长沙爱思特医疗美容医院行保留睑板前眼轮匝肌睑缘切口内固定法重睑术的患者临床资料。沿上睑设计的2条去皮线切开皮肤,去除皮肤后沿去皮上线从眼轮匝肌下分离,于睑板上缘呈楔形适量修薄睑板前眼轮匝肌,从睑板上缘沿睑缘方向剥离睑板前眼轮匝肌;将睑板前筋膜或上睑提肌腱膜与重睑线位置的眼轮匝肌做内固定,确认重睑形态及对称性后缝合皮肤。术后对手术切口愈合、眼睑肿胀、并发症情况进行观察,对重睑形态进行随访;术后6个月,调查患者对手术效果的满意度(满意、比较满意、不满意),并用温哥华瘢痕量表(VSS)对上睑瘢痕情况进行评分(包括色泽、厚度、血管分布、柔软度),评分越高说明瘢痕越严重。结果共纳入78例单睑或隐性重睑患者,男6例,女72例,年龄18~40岁。所有患者均行改良保留睑板前眼轮匝肌睑缘切口内固定法重睑术,其中29例同时行上睑下垂矫正术,47例同时行内眦赘皮矫正术,术后切口均一期愈合。78例获得1~6个月随访,术后上睑有轻微肿胀,71例术后10~15 d消除,7例术后25~30 d消除。其中有61例获得6个月随访,患者重睑弧度均自然流畅,双侧基本对称,无重睑变浅、无睑板前组织堆积等不良表现,无眼睑闭合不全等并发症发生;57例对手术效果满意,4例比较满意。61例患者闭眼时切口瘢痕不明显,VSS评分均接近0分,色泽、厚度、血管分布、柔软度平均分分别为0.29、0、0.31、0分。结论该术式基本保留了全部睑板前眼轮匝肌,有利于眼部淋巴循环;选择眼轮匝肌做内固定,既可以更简单的操作来保障睑缘切口内固定法重睑术的效果,又可加速术后眼睑的恢复,减少眼睑闭合不全的发生。

关键词：眼睑成形术睑板前眼轮匝肌重睑术睑缘切口

绿色信贷对“两高”企业债务融资规模影响研究

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征信 2024年第1期42卷 70-78页

作者：魏巍郑红张娇娇河南工程学院河南郑州451191

党的十八大以来,我们党领导全国人民坚持以新发展理念为引领,坚定不移走生态优先、绿色发展道路,大力推行经济社会绿色发展转型升级并取得显著成效。在绿色发展进程中,绿色信贷这一金融利器发挥了应有的作用。以2012年《绿色信贷指引》... 详细信息

党的十八大以来,我们党领导全国人民坚持以新发展理念为引领,坚定不移走生态优先、绿色发展道路,大力推行经济社会绿色发展转型升级并取得显著成效。在绿色发展进程中,绿色信贷这一金融利器发挥了应有的作用。以2012年《绿色信贷指引》的发布为切入点,选取2009—2022年A股“两高”企业上市公司作为研究样本,将企业异质性和区域异质性纳入绿色信贷政策实施的影响机制;同时加入产权和区域的交乘项进行回归分析。研究表明,绿色信贷在一定程度上降低了“两高”企业的债务融资规模,且对非国有企业与中西部地区企业债务融资水平的牵制更强。

关键词：绿色信贷 “两高”企业债务融资规模企业异质性区域异质性

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疏水微孔膜蒸馏膜的应用进展

膜科学与技术 2024年第1期44卷 137-146页

作者：徐浩然张娜张娇娇陈越王志宁山东大学环境科学与工程学院青岛266237 山东东岳高分子材料有限公司含氟功能膜材料国家重点实验室淄博256401

膜蒸馏作为一种热法与膜法耦合的高效分离技术,在海水淡化、工业废水处理等多个领域都具有广阔的应用前景.然而膜蒸馏在实际应用中存在疏水膜的润湿、污染、结垢等瓶颈,以及能量利用效率低、实际通量低等问题,尚未得到大规模的应用推广... 详细信息

膜蒸馏作为一种热法与膜法耦合的高效分离技术,在海水淡化、工业废水处理等多个领域都具有广阔的应用前景.然而膜蒸馏在实际应用中存在疏水膜的润湿、污染、结垢等瓶颈,以及能量利用效率低、实际通量低等问题,尚未得到大规模的应用推广.本文从膜蒸馏技术的简要介绍出发,总结了膜蒸馏技术的发展历程.之后综述了膜蒸馏技术在国内外企业的商业应用情况,分析了疏水微孔膜蒸馏膜在多个水处理领域的应用潜力.最后总结了制约膜蒸馏应用的主要问题,并探讨了膜蒸馏的未来发展方向.

关键词：膜蒸馏疏水膜膜改性脱盐废水处理