Analysis of the Intrinsic Uncertainties in the Laser-Driven Iron Hugoniot Experiment Based on the Measurement of Velocities

One of the most challenging tasks in the laser-driven Hugoniot experiment is how to increase the reproducibility and precision of the experimental data to meet the stringent requirement in validating equation of state models. In such cases, the contribution of intrinsic uncertainty becomes important and cannot be ignored. A detailed analysis of the intrinsic uncertainty of the aluminum-iron impedance-match experiment based on the measurement of velocities is presented. The influence of mirror-reflection approximation on the shocked pressure of Fe and intrinsic uncertainties from the equation of state uncertainty of standard material are quantified, Furthermore, the comparison of intrinsic uncertainties of four different experimental approaches is presented. It is shown that, compared with other approaches including the most widely used approach which relies on the measurements of the shock velocities of AI and Fe, the approach which relies on the measurement of the particle velocity of Al and the shock velocity of Fe has the smallest intrinsic uncertainty, which would promote such work to significantly improve the diagnostics precision in such an approach.

Visual Passive Ranging Method Based on Re-entrant Coaxial Optical Path and Experimental Verification

To overcome the shortcomings of the traditional passive ranging technology based on image, such as poor ranging accuracy, low reliability and complex system, a new visual passive ranging method based on re-entrant coaxial optical path is presented. The target image is obtained using double cameras with coaxial optical path. Since there is imaging optical path difference between the cameras, the images are different. In comparison of the image differences, the target range could be reversed. The principle of the ranging method and the ranging model are described. The relationship among parameters in the ranging process is analyzed quantitatively. Meanwhile,the system composition and technical realization scheme are also presented. Also, the principle of the method is verified by the equivalent experiment. The experimental results show that the design scheme is correct and feasible with good robustness. Generally, the ranging error is less than 10% with good convergence. The optical path is designed in a re-entrant mode to reduce the volume and weight of the system. Through the coaxial design,the visual passive range of the targets with any posture can be obtained in real time. The system can be widely used in electro-optical countermeasure and concealed photoelectric detection.

Experimental Investigation of All-Optical NRZ-DPSK to RZ-DPSK Format Conversion Based on TOAD

We propose and experimentally demonstrate a novel all-optical non-return-to-zero differential-phase-shift-keying （NRZ-DPSK） to return-to-zero differentiM-phase-shift-keying （RZ-DPSK） format conversion scheme. This scheme is based on the terahertz optical asymmetric demultiplexer （TOAD）. A 10 Gb/s converted RZ-DPSK signal is obtained with a wide duty cycle tuning range from 16% to 66%. For all converted RZ-DPSK signals, the receiver sensitivities at BER of 10-9 are 0.4 to 1.7dB higher compared with the original NRZ-DPSK signal. The clear and open eye diagrams are presented to demonstrate the high quality format conversion performance. Moreover, the optical spectra show that this conversion is in a wavelength-preserving operation.

Comparison of histopathology and PCR based assay for detection of experimentally induced toxoplasmosis in murine model

Objective:To compare histopathology and PCR based detection in diagnosis of experimentally induced toxoplasmosis of RH human strain of the parasite in murine models.Methods:A comparison of histopathology and PCR based detection was done to diagnose experimentally induced toxoplasmosis in ten inbred swiss albino mice after intraperitoneal inoculation of 100 tachyzoites of laboratory mantained human RH strain of the parasite.Tissue samples from lung,liver,spleen,brain,heart and kidney were taken and processed for histopathological examination while all the samples also were subjected to PCR,using primers directed to the multicopy of SAG 3 gene,in dublicates.Results:Histopathology revealed presence of tachyzoites only in liver while along with lung,liver,spleen and brain tissue yielded desired positive PCR amplicons.Conclusions:The SAG 3 based PCR is able to diagnose toxoplasmosis in those tissues which are declared negative by histopathological assay.

PROGRESS OF MARINE METEOROLOGICAL OBSERVATION EXPERIMENT AT MAOMING OF SOUTH CHINA

The coastal area of southern China is frequently affected by marine meteorological disasters,and is also one of the key areas that influence the short-term climate change of China.Due to a lack of observational facilities and techniques,little has been done in this area in terms of operational weather monitoring and scientific research on atmospheric and marine environment.With the support of China Meteorological Administration (CMA) and Guangdong Meteorological Bureau (GMB),the Marine Meteorological Science Experiment Base (MMSEB) at Bohe,Maoming has been jointly established by Guangzhou Institute of Tropical and Marine Meteorology (GITMM) and Maoming Meteorological Bureau (MMB) of Guangdong Province after three years of hard work.It has become an integrated coastal observation base that is equipped with a complete set of sophisticated instruments.Equipment maintenance and data quality control procedures have been implemented to ensure the long-term,steady operation of the instruments and the availability of high quality data.Preliminary observations show that the data obtained by the MMSEB reveal many interesting features in the boundary layer structure and air-sea interaction in such disastrous weather as typhoons and sea fog.The MMSEB is expected to play an important role in the scientific research of disastrous weather related to marine meteorology.

Experimental Study on Tensile Behavior of Cement Paste, Mortar and Concrete under High Strain Rates

Effects of the strain rate on cement paste, mortar and concrete were studied. A modified SHPB testing technique with fl attened Brazilian disc（FBD） specimen was developed to measure the dynamic tensile stress-strain curve of materials. A pulse-shaped split Hopkinson pressure bar（SHPB） was employed to determine the dynamic tensile mechanical responses and failure behavior of materials under valid dynamic testing conditions. Quasi-static experiments were conducted to study material strain rate sensitivity. Strain rate sensitivity of the materials was measured in terms of the stress-strain curve, elastic modulus, tensile strength and critical strain at peak stress. Empirical relations between dynamic increase factor（DIF） and the material properties were derived and presented.

Pathophysiology of nephrogenic systemic fibrosis:A review of experimental data

Since the association between nephrogenic systemic fibrosis(NSF) and gadolinium contrast agents(Gd-CAs) was suggested in 2006,several experimental studies have been published to elucidate the role of these agents in the pathogenesis of NSF.Low stability Gd-CAs have a stimulant effect on human skin and fibroblasts in culture and modulate the production of collagen by these cells.Low stability agents have also induced NSFlike skin changes in a rat model with normal renal function after multiple repeat administrations.The role of the 5/6 subtotal nephrectomy rat model in investigating NSF remains under evaluation.

互联网+时代新医科临床血液学检验技术虚拟仿真案例式实验教学案例库的构建与实践研究

案例教学法是高校教学改革的重要手段,互联网+时代新医科临床血液学检验技术虚拟仿真案例式实验教学案例库资源匮乏,因此构建案例库迫在眉睫。案例库建设能满足多元化教学及教学改革的需求,对优化课程体系、改革教学模式、创建一流本科课程及培养能适应现代医学发展的复合型、创新型、应用型医学检验技术专业人才具有重要意义。

试验基地建设新模式的探索与实践——以广东省农业科学院水稻研究所试验基地为例

农业试验基地不仅是农业科研活动顺利开展的基本保障,也是农业科技创新、服务“三农”和农业科技成果转化的重要窗口。以广东省农业科学院水稻研究所试验基地为例,分析了基地建设管理现状、成效和存在的问题。广东省农业科学院水稻研究所以建设广东省农作物现代种业产业园为抓手,探索“核心技术+产业融合+场景实践+示范推广”的建设新模式,通过改善设施装备、延伸产业链、强化智能化建设、加强基地管理队伍建设等措施,提高试验基地的服务质量和效率,助力广东水稻产业高质量发展。

基于流变-原位同步测量技术的实验教学设计——以原油流变性研究型开放实验为例

为提高油气储运工程专业本科生对含蜡原油管道输送过程中的工程思维能力,加深其对管道流动安全保障流变性机理的思考,基于当前的新技术——流变-原位同步测量技术,开展原油流变性研究型实验项目。实验过程中,针对含蜡原油采用流变-偏光显微原位同步测量技术对不同初冷温度的降温过程中,含蜡原油的黏弹性等流变性参数及蜡晶微观动力学行为进行同步分析。该实验不仅能加深学生对原油流变性机理的思考,提高其实践能力和实验操作技能,更能激发其科研创新意识和创新热情。

湖冰作为极地海冰技术中试基地的探讨

极地海冰技术验证需在不同环境中开展测试,渤海海冰的不稳定性无法保障反复的长期试验时间,寻求利用国内寒区湖泊作为中试基地,解决室内缺少接近极地条件的中试难题。为此,在含章湖、青海湖、乌梁素海和呼和诺尔湖开展湖冰生消、物理性质、力学性质等调查研究,并与南、北极海冰的物理和力学性质进行对比评估。结果表明,含章湖、青海湖、乌梁素海湖和呼和诺尔湖均有时间充裕的冰封期。呼和诺尔湖冰厚最大,超过1 m;乌梁素海冰厚超过50 cm;含章湖和青海湖冰厚相似,最大冰厚超过30 cm。含章湖、青海湖和乌梁素海冰晶体均以柱状冰为主,与极地一年冰晶体结构相似。含章湖和青海湖冰的盐度及密度与北极夏季海冰相似。含章湖冰的单轴压缩强度比极地夏季海冰强度高;乌梁素海湖冰强度与南极普里兹湾固定冰强度相似。研究结果表明国内一些湖泊可作为极地海冰技术验证的中试基地。

基于PBL模式的生物化学实验课程思政教学探索与实践

以生物化学实验课为例,在中国高等教育新时代背景下,运用PBL(Problem-Based Learning,PBL)模式融合思政元素,探讨了对课程思政方面的改革与实践。基于课程思政在育人目标中的重要性,以实验教学内容为基础,以问题为导向,深入挖掘课程所包含的立德树人、绿色化学、科学创新等思政元素,并将其有机融入到实验教学中,通过教学模式的创新,达到了促进学生主动思考和创新思维的目的,有效激发了学生学习兴趣,培养了学生的团队合作精神,提高了学生学习积极性,实现了生物化学实验课程思政改革的目标。

多元智能视角下地方高校“实践基地+创新社团”工程教育模式探究

以霍华德·加德纳多元智能理论为理论基础,以地方应用型高校学生工程教学实践创新能力培养为目标,提出了“实践基地+创新社团”工程教育模式。在该模式下,以项目目标为驱动力,实践基地平台的实验设备、实验项目等为学生创新活动提供优良的环境和机会,在教师的组织、协调和引导下,通过创新社团的形式组织大学生以小组合作的形式进行自主创新。“实践基地+创新社团”工程教育模式是对课堂教学的一种有效补充,也是大学生自主创新和协作能力培养的有效手段。

农业科研基地助推青少年科普教育工作的实践探索与思考--以中国农业科学院茶叶研究所嵊州综合实验基地为例

本文以中国农业科学院茶叶研究所嵊州综合实验基地的青少年科普教育工作为例,阐述了农业科研基地在科普教育中的做法与成效,探讨农业科研基地在科普工作中存在的不足,分析了新形势下青少年发展的需求,提出了农业科研基地推进青少年科普工作的建议。

人工智能项目式综合实验教学平台设计与实践

为满足人工智能领域对高级工程实践人才的需求,基于OBE的教学理念构建了以项目为驱动的人工智能综合实验教学平台。该平台通过“验证性实验→设计性实验→综合实践性实验”的递进式教学,强化学生的人工智能专业理论知识,培养学生主动学习能力和在真实应用情境中的实践技能。平台设计了人工智能算法仿真实验,嵌入式及AI边缘计算实验,人工智能综合创新实验的教学案例,覆盖了从基础理论到高级应用的全方位教学内容。教学实践表明,该平台有效地促进了学生在人工智能领域的专业成长,提高了学生解决实际问题的能力和创新思维,帮助学生更好地适应人工智能产业的快速发展和不断升级的需求。

前沿科研成果融入《热工学》实验教学——木材炭基电催化材料制备

《热工学》是木材科学与工程专业的一门专业基础课,将科学前沿成果融入《热工学》实验教学,以促进学生对知识点的理解和对学科的全面认识。因此,以木材炭基电催化材料制备及性能分析为课题,开展实验教学,重点讲解阔叶材杨木及其炭材料的微观构造、木材炭基复合材料的制备过程及电催化分解水析氢的测试原理及方法等,将理论知识与实践相结合,培养学生的动手能力、解决问题的能力及科研思维,助力培养符合时代发展要求的创新型人才。

基于案例教学的课程思政在药物化学实验教学中的探索与实践

目的 探索基于案例教学的课程思政在药物化学实验教学中的应用。方法 从实验安全观,科学奉献,绿色化学,民族自豪感等方面,探索基于案例教学的课程思政与药物化学实验教学的融合,以提高药物化学实践教学与课程思政协同育人的效果。结果 将案例教学融入课程思政与药物化学实验中,不仅有助于提高学生实验技能、强化人文素养,而且有助于引导学生树立正确世界观、人生观和价值观。结论 基于案例教学的课程思政是新时代实现课程思政与药物化学实验教学有机融合的有效途径。

基于3M-PBL-OBE的机械工程实验教学体系改革与实践

针对传统实验教学中存在以认知体验为主、缺乏连贯层次化设计和过度依赖实验报告等问题,以装备设计制造能力培养为导向,融合基于模型设计(MBD)、虚实结合的机电概念设计(MCD)、制造执行系统MES等理念方法,建立以项目式学习为驱动的层次递进式实验教学构架,改革现有专业课程实践知识体系,培养能够解决复杂工程问题的高质量机械工程人才。通过持续实践,取得了明显的成效。

面向交通强国的交通地理课程思政实验案例库设计

交通地理学是经济地理学的分支,服务于交通基础设施布局与规划,是关系到我国社会经济发展的重要课程.交通地理课程思政元素丰富,但缺乏系统梳理和设计.面向交通强国建设需求,从不同交通运输方式系统挖掘了思政元素.将研究对象抽象为点、线和网三要素,设计了交通地理课程实验的整体思路与框架.基于该框架,分别从城市、全国和亚欧大陆三个不同空间尺度,针对性地给出了南京市新能源充电桩空间布局特征、全国高速铁路网络结构分析和“一带一路”陆海运输通道专题制图实验具体方案和思政重点.有助于学生掌握本课程基础理论和实操技能,同时树立民族自豪感、大局观和使命感.

基于OBE理念下形态学研究方法实验教学的改革与实践

形态学研究方法广泛适用于基础医学及临床医学的科学研究。传统的形态学实验教学缺乏实验设计以及对实验结果的预判和分析,医学生独立、创新和创造性思维未能得到充分展示。基于成果导向教育(OBE)是指以成果为目标导向,以学生为本,采用逆向思维方式进行的课程体系,是一种先进的教育理念,符合国家卫生健康委员会培养多层次复合型医学人才的需求。本教学改革以“5+3”一体化临床医学专业学生为研究对象,选择“皮肤机械性损伤修复”作为学生的科研设计课题,将改良Masson三色染色法应用到实验课堂,并增加对染色和实验结果的分析和讨论。教学反馈及评价表明,基于OBE理念的形态学教学不仅能够培养学生独立、创新、创造性思维,而且有效提高了形态学实验教学质量。