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The Differential Algorithm for American Put Option with Transaction Costs under CEV Model

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Journal of Systems Science and Information 2014年第5期2卷 401-410页

作者： Zhao YIN chang tan School of Statistics and Mathematics Central University of Finance and Economics

This paper mainly studies the American put option pricing with transaction costs in the CEV process. The specific Crank-Nicolson form of numerical solution is obtained by the finite difference method. On this basis, Hong Kong stock CKH option is selected as the object to estimate option ***, by comparing with the actual price, the American put option pricing model is verified as reasonable. This paper is significant to the rational pricing and the institutional construction of the upcoming stock options in mainland China.

关键词： CEV model American option pricing the finite difference method put option

DCB浸提-土壤中游离铁三种检测方法的比较与分析

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中国标准化 2024年第17期 221-226页

作者：鄢中妮杨宝红冉福林谭昌玲熊福平资源与生态环境地质湖北省重点实验室(湖北省地质局) 湖北省地质局第二地质大队

土壤中游离铁的测试方法有电感耦合等离子体发射光谱法、原子吸收分光光度法、比色法等。通过对比实验,发现三种方法各项指标均能满足检测要求,电感耦合等离子体发射光谱法测定RSD=0.50%,相关系数为1.0000,流程更简单,检出限更低,线性... 详细信息

土壤中游离铁的测试方法有电感耦合等离子体发射光谱法、原子吸收分光光度法、比色法等。通过对比实验,发现三种方法各项指标均能满足检测要求,电感耦合等离子体发射光谱法测定RSD=0.50%,相关系数为1.0000,流程更简单,检出限更低,线性范围更宽,精密度更高,准确度更好。本文指出,在实际检测生产中,采用DCB浸提-电感耦合等离子体发射光谱法,既可确保结果准确可靠,又可大幅提高检测效率。该方法更适合大批量土壤样品中游离铁的测定。

关键词：土壤游离铁电感耦合等离子体发射光谱法原子吸收分光光度法比色法

微波消解-电感耦合等离子体发射光谱法测定土壤有效硼

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中国土壤与肥料 2024年第5期 222-226页

作者：谭昌玲杨宝红齐书洲熊福平冉福林鄢中妮万传杰邓端富资源与生态环境地质湖北省重点实验室(湖北省地质局) 湖北武汉430034 湖北省地质局第二地质大队湖北恩施445000

探究用微波消解进行前处理与电感耦合等离子体发射光谱仪(ICP-OES)检测相结合的方法,通过实验对消解时间、消解温度、升温时间及测定过程中铁共存干扰元素、土壤的pH进行了研究。在ICP-OES光谱仪的最优工作条件下,谱线249.773 nm的硼灵... 详细信息

探究用微波消解进行前处理与电感耦合等离子体发射光谱仪(ICP-OES)检测相结合的方法,通过实验对消解时间、消解温度、升温时间及测定过程中铁共存干扰元素、土壤的pH进行了研究。在ICP-OES光谱仪的最优工作条件下,谱线249.773 nm的硼灵敏度高、峰形好,测定结果表明,当样重为10.00 g,浸提液体积为20 mL时,方法检出限为0.005 mg/kg,测定下限为0.020 mg/kg,精密度和准确度满足检测要求,此法适用于批量土壤有效硼的测定。

关键词：微波消解 ICP-OES法土壤有效硼

Abnormal mechanochemical effect in ultraprecision machining of an additively manufactured precipitation-strengthened high-entropy alloy

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Journal of Materials Science & Technology 2024年第3期170卷 221-237页

作者： Long Xu Yuchao Bai Yunfa Guo chang Ren Xiaohua tan Yandong Jia Gang Wang Hao Wang Institute of Materials Shanghai UniversityShanghai 200444China Zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314100China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

Recently,researchers have explored the use of precipitation strengthening and finer microstructures with high-density dislocations in additive manufacturing to produce high-entropy alloys(HEAs)with adjustable ***,the inherent surface roughness and lack of machinability research in AMed HEAs limit their engineering *** this study,we systematically investigated the microstructural characteristics,mechanical properties,and machinability of Fe_(29.3)Co_(28.7)Ni_(28.6)Al_(6.8)Ti_(6.6)(at.%)HEAs with three different structures:single FCC phase cellular(SPC),dual precipitation-strengthened(DPS),and single precipitation-strengthened(SPS).These structures were fabricated by selective laser melting and isothermally annealing at 780 and 940℃.Compared to SPC HEA,DPS HEA exhibits a significant increase in yield strength and ultimate tensile strength but with a dramatic sacrifice in *** HEA exhibits similar mechanical properties to SPC HEA due to the pronounced coarsening of L21 *** ultraprecision machining micro-cutting test showed that SPC HEA had a significant mechanochem-ical effect,as evidenced by a sharp drop in cutting force for inked workpieces,but not DPS *** abnormal finding was that the negligible reflection of cutting force for SPS HEAs suggested a negative mechanochemical effect,even though SPS HEA had equally excellent plasticity like SPC *** was found that nanocrystallization-induced strength enhancement and ductility reduction of SPS HEA lead to chips’deformation dominated by shear avalanche rather than chip folding of SPC HEA,which involves the reduction of surface energy and friction of chips’***,these results and our research findings may guide the machining of AMed precipitation-strengthened HEAs and accelerate their engineering ap-plication.

关键词： High-entropy alloy Selective laser melting Precipitation strengthening Machinability Mechanochemical effect

Highly selective photocatalytic oxidation of methane to methyl hydroperoxide

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Nano Research 2024年第4期17卷 2473-2480页

作者： Chunling Bo Li Zhang Xiaolong Liu Huaiqiu chang Yingxue Sun Xinyi Zhang Ting tan Lingyu Piao National Center for Nanoscience and Technology Beijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Partial oxidation of methane into primary oxidation products with high value remains a *** this work,photocatalytic oxidation of methane(CH_(4))with high methyl hydroperoxide(CH_(3)OOH)selectivity is achieved using pure titanium oxide(TiO_(2))without any cocatalyst at room temperature and atmospheric *** CH_(3)OOH production rate can reach up to 2050±88μmol·g^(-1)·h^(-1) at pH≈7.0 with 100%selectivity in the liquid *** stable reaction cycle can reach more than 30 *** low-cost system achieves superior CH_(4) conversion activity and selectivity compared with similar *** energy of hydrogen peroxide(H_(2)O_(2))to adsorbed hydroperoxyl radical(^(*)OOH)has a significantly lower reaction energy than conversion to adsorbed hydroxyl radical(*OH)on the(210)surface of the TiO_(2).The^(*)OOH preferentially combines with methyl radical(·CH_(3))to form the most energetically favorable CH_(3)*** mild oxidative environment of this system prevents the reduction of CH_(3)OOH to CH_(3)OH or over-oxidation of CH_(4),which ensures the final CH_(3)OOH with high selectivity and *** work provided a low-cost but highly efficient method to achieve partial oxidation with superior selectivity,i.e.,to convert CH_(4) into high-value chemicals.

关键词： photocatalytic methane oxidation methyl hydroperoxide titanium oxide

Polarization of M1 tumor associated macrophage promoted by the activation of TLR3 signal pathway

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Asian Pacific Journal of Tropical Medicine 2016年第5期9卷 470-474页

作者： Bo Liu Xia Wang Tai-Zhong Chen Guang-Liang Li chang-Chun tan Yong Chen Shao-Qiang Duan Department of Pediatric Surgery Yongchuan hospital of chongqing medical university

Objective: To investigate the correlation between activation of toll-like receptors 3(TLR3) signaling pathway and tumor-associated macrophage and its effect on the tumor growth. Methods: The mice Lewis lung cancer cell lines 3LL and melanoma B16H10 were used to construct the subcutaneous transplantation tumor models and then they were treated with Poly-ICLC. The curative effect was observed and then the T cell and macrophage phenotypes infiltrated in local tumor were detected by flow cytometry. After the in vitro culture of mouse bone marrow-derived macrophage, the real-time PCR and western blot were applied to detect the expression of macrophage activation markers and the activation of intracellular signaling pathways. Results: The survival time of mice with brown tumor treated with Poly-ICLC significantly increased and the tumor growth was inhibited. The ratio of local tumor-infiltrated Treg decreased, while the ratio of CD8+ T cell increased significantly. The macrophages surface CD206 expression was down-regulated while the expression of i NOS increased. The Poly-ICLC could promote the expression of M1 markers(IL-1毬, TNF-α毩 and i NOS) in bone marrow-derived macrophage and inhibited the expression of M2 molecules(Arg-1, YM-1 and CD206). The phosphorylation level of downstream p65, TBK1 and IRF3 increased significantly. Conclusions: The Poly-ICLC can activate the TLR3 downstream signaling pathway to induce a M1 polarization of tumor associated macrophage, thereby inhibiting the tumor growth.

关键词： Tumor-associated macrophage TLR3 Poly-ICLC M1

Room-temperature phonon-coupled single-photon emission in hexagonal boron nitride

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 109-114页

作者： Jia-Min Lai Qing-Hai tan Feilong Song Haonan chang Yanpei Lv Xue-Lu Liu Jinghua Teng Weibo Gao Ping-Heng tan Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing100083China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education&Research Institute of Materials Science Shanxi Normal UniversityTaiyuan 030000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore

Photon-lattice(phonon)coupling is fundamental to light-matter interaction,particularly when it reaches the quantum limit of the phonon-coupled single-photon emission,which holds great potential for quantum manipulation and quantum information ***,we report single defect state-phonon coupling in hexagonal boron nitride(h BN)at room *** ultrabroad spectrum of single-photon emissions can be achieved by selecting the excitation *** photoluminescence excitation spectroscopy,we observe single-phonon-assisted resonance-enhanced single-photon emission,along with multiple phonon replicas that herald the creation of phonon Fock *** also develop a transition model to gain insight into the physical process behind the single defect state-phonon *** work sets the stage for manipulating electron-phonon coupling state with single quantum-level precision at room temperature.

关键词： temperature phonon hexagonal

Diabetic corneal neuropathy as a surrogate marker for diabetic peripheral neuropathy

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Neural Regeneration Research 2022年第10期17卷 2172-2178页

作者： Wei Zheng So Natalie Shi Qi Wong Hong chang tan Molly Tzu Yu Lin Isabelle Xin Yu Lee Jodhbir S.Mehta Yu-Chi Liu Yong Loo Lin School of Medicine National University of SingaporeSingaporeSingapore Singapore Eye Research Institute SingaporeSingapore Department of Endocrinology Singapore General HospitalSingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CentreSingaporeSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingaporeSingapore

Diabetic neuropathy is a prevalent microvascular complication of diabetes mellitus,affecting nerves in all parts of the body including corneal nerves and peripheral nervous system,leading to diabetic corneal neuropathy and diabetic peripheral neuropathy,*** peripheral neuropathy is diagnosed in clinical practice using electrophysiological nerve conduction studies,clinical scoring,and skin ***,these diagnostic methods have limited sensitivity in detecting small-fiber disease,hence they do not accurately reflect the status of diabetic *** recently,analysis of alterations in the corneal nerves has emerged as a promising surrogate marker for diabetic peripheral *** this review,we will discuss the relationship between diabetic corneal neuropathy and diabetic peripheral neuropathy,elaborating on the foundational aspects of each:pathogenesis,clinical presentation,evaluation,and *** will further discuss the relevance of diabetic corneal neuropathy in detecting the presence of diabetic peripheral neuropathy,particularly early diabetic peripheral neuropathy;the correlation between the severity of diabetic corneal neuropathy and that of diabetic peripheral neuropathy;and the role of diabetic corneal neuropathy in the stratification of complications of diabetic peripheral neuropathy.

关键词： corneal nerve quantification corneal nerves diabetic cornea diabetic corneal neuropathy diabetic microvascular complications diabetic peripheral neuropathy in vivo confocal microscopy neurotrophic keratopathy ocular surface

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一种无源型变压器铁心接地电流越限告警电路

农村电气化 2024年第4期 21-23页

作者：许继东谭畅巴德彧任宣泽丁小龙刘国强国网吉林东丰县供电公司吉林辽源136300

目前,市面上的变压器铁心接地电流监测装置工作时都需要外接电源,另外价格高昂。为此设计一种无源型变压器铁心接地电流越限告警电路,这种电路不再需要外接电源,同时具有越限告警电流精准稳定、运行安全可靠、电路简单、体型小巧、造价... 详细信息

目前,市面上的变压器铁心接地电流监测装置工作时都需要外接电源,另外价格高昂。为此设计一种无源型变压器铁心接地电流越限告警电路,这种电路不再需要外接电源,同时具有越限告警电流精准稳定、运行安全可靠、电路简单、体型小巧、造价低廉等优势,具备良好的应用及推广条件。

关键词：变压器铁心接地电流电流互感器电压检测器