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泡沫金属孔密度对石蜡相变传热强化的影响机理

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流体机械 2024年第5期52卷 1-8,54页

作者：朱刘灿王子龙金谦胡常青上海理工大学能源与动力工程学院上海200093 克拉玛依碳和网络科技有限公司新疆克拉玛依834000 上海铂世光半导体科技有限公司上海201700

为了探究泡沫金属孔密度对相变材料熔化过程中流动传热特性的影响,通过试验设计并搭建了1套半圆柱形的可视化蓄热装置,分析了孔密度对复合相变材料熔化过程中温度分布、固液相界面、换热系数等热特性的影响机理。结果表明:泡沫金属铜能... 详细信息

为了探究泡沫金属孔密度对相变材料熔化过程中流动传热特性的影响,通过试验设计并搭建了1套半圆柱形的可视化蓄热装置,分析了孔密度对复合相变材料熔化过程中温度分布、固液相界面、换热系数等热特性的影响机理。结果表明:泡沫金属铜能够提高内部石蜡的温度响应速率,缩短熔化时间,并减小相变材料内部温度梯度;纯石蜡和孔密度为0.20,0.59,0.98 mm^(-1)的铜复合相变材料在石蜡熔化后的温度梯度分别为35.26,12.19,20.49,28.39 K;自然对流换热占比也随着泡沫金属铜孔密度的增加而减小;当加热功率为30 W时,孔密度为0.20,0.59,0.98 mm^(-1)的铜复合相变材料自然对流占比分别为20.72%,19.33%,18.24%,且自然对流占比均小于50%,表明在填充率为1.28%的条件下,泡沫金属铜复合相变材料的传热机制以热传导为主。研究结果可为相变蓄热系统的设计提供参考。

关键词：泡沫金属孔密度相变储能强化传热

Eco-environment contribution of agroforestry to agriculture development in the plain area of China—Huai'an Prefecture, Jiangsu Province as the case study area

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Journal of Environmental Sciences 2005年第2期17卷 327-331页

作者： RENHong-chang LUYong-long liucan MENGQing-hua SHIYa-juan ResearchCenterforEco-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China／／AcademyofForestInventoryandPlanningStateForestryAdministrationBeijing100714China ResearchCenterforEco-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China ChinaNationalForestryEconomicsandDevelopmentResearchCenter Beijing100714China AcademyofForestInventoryandPlanning StateForestryAdministrationBeijing100714China

For improving the environmental quality and ensuring supply of wood and non-timber forest products, many forests have been planted in plain areas of China. Scientists have studied their benefits, almost all of the approaches were based on fixed-point data, and few was considered on the non-efficient factors and temporal scale effects. This paper studies the positive and negative benefits at a large temporal scale, and the effects of plain afforestation on stockbreeding and rural economy. The benefits of plain afforestation, correlation coefficiency of agroforestry and production factors are analyzed via stochastic frontier modeling in Huanghuaihai Plain Area of China; elastic coefficient of agroforestry, husbandry, farming, and total output of agricultural sector are calculated through adopting partial differential equation. Some conclusions can be drawn that, plain forests have an important effect on the development of plain agriculture. But shelterbelts and small-scale forests have different effect on the development of agricultural economy. Shelterbelts have negative effect on the industries, but small-scale forest has positive effect. On the whole, contribution of forest resource to value of animal husbandry and gross production value of agriculture is positive, and to the value of farming is negative.

关键词： plain afforestation agricultural development agroforestry plain area of China

Oncological miR-182, a novel smooth muscle cell phenotype modulator and negatively correlated to plasma asymmetric dimethylarginine concentration in patient with coronary heart disease

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中国药理学通报 2015年第B11期31卷 53-54页

作者： MAMing-ming liucan-zhao DeptofPharmacology CardiacandCerebralVascularResearchCenterZhongshanSchoolofMedicineSunYat-SenUniversityGuangzhou510080

Background and Aim Vascular smooth muscle cell （SMC） phenotype change is a hallmark of vascu-lar remodeling, which can be regulated via MicroRNAs （miRNAs）-dependent mechanism. We recently identified Asymmetric dimethylarginine （ADMA） positively correlates to vascular remodeling-based diseases. Here, we hy-pothesized that ADMA induces SMC phenotypic change via a miRNA-dependent mechanism. Methods and Results Microarray analysis enabled the identification of 7 deregulated microRNAs in ADMA-treated human aortic artery smooth muscle cells （hASMCs）. miR-182 was validated by real-time-PCR. Isobaric tags for relative and absolute quantitation （iTRAQ） based analysis of the hASMC proteome revealed that transfection of an miR-182 inhibitor sig- nificantly increased myeloid-associated differentiation marker （MYADM）, which was verified using Western blot and reporter activity quantization with the MYADM 3＇-UTR dual-luciferase reporter system, miR-182 knockdown further repressed Sprouty2 and enhanced MYADM, leading to ERICZMAP kinase-dependent and MYADM-depend- ent hASMC phenotypic change including proliferation, migration and differentiation marker gene expression change. In vivo, adeno-miR-182 markedly suppressed carotid neointimal formation by using balloon-injured rat carotid artery model, specifically via decreased MYADM expression. Atherosclerotic lesions from patients with high ADMA plas- ma levels exhibited decreased miR-182 expression levels and elevated MYADM expression levels. In patients with coronary heart disease （n- 164）, the miR-182 expression level in plasma was negatively correlated with the plas- ma ADMA levels. Conclusions miR-182 is a novel SMC phenotypic modulator by targeting MYADM and can be a potential therapeutic target combating vascular remodeling-associated diseases. Reduced plasma miR-182 levels might be a new predictor of high vascular remodeling risk especially in patient with coronary heart disease.

关键词： miRNA vascular smooth muscle cells phenotype change vascular remodeling coronary heart dis-ease

Exo/endogenous factors co-activatable nanodevice for spatiotem-porally controlled miRNA imaging and guided tumor ablation

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Nano Research 2022年第2期15卷 845-857页

作者： Zhenqiang Wang Tao Ding liucan Wang Shuai Wang Meizhen Zhou Jixi Zhang Kaiyong Cai Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing 400044China

Remote activation of biomarker sensing holds a great promise of shifting the success of in vitro diagnostics to spatiotemporally controlled in vivo visualization of tumor,and in turn,imaging guided ***,a"dual-key-one-lock"nanodevice was designed and built by assembling thermo-activatable probe of trimeric DNA hybrids into a mesoporous polydopamine nanoparticle-based multifunctional nanotransducer(probe host,fluorescence quencher,and photothermal conversion agent),enabling precisely switchable theranostic operations under the co-activation of exo/endogenous stimulations(near-infrared(NIR)light and microRNA(miRNA)).By this design,the NIR irradiation-induced local heat through the porous nanotransducer can be transferred to the DNA nanothermometer for triggering the exposure of the miRNA recognition segment,as well as the subsequent fluorescence activation by strand displacement reactions(SDR).A programmable application of short-(3 min)and long-duration(10 min)NIR irradiation was administered sequentially to induce a milder and a stronger hyperthermia,respectively,to activate the localized miRNA imaging,and in turn,tumor thermoablation under the fluorescence guidance in *** reducing nonspecific activation,dual factor co-activatable nanodevices exhibited a high tumor-to-background ratio(TBR)value of 8.9,as well as a significantly lower(6-9-fold)normal tissue fluorescence as compared with those sensing miRNA *** in vivo results show that the tumors were significantly suppressed after the photothermal therapy with the assistance of the accurate miRNA *** rationally integrated nanoplatform may pave a new avenue for advanced theranostic systems with high spatiotemporal precision by activatable designs.

关键词： thermo-activatable probe porous nanotransducer photothermal activation spatiotemporal miRNA imaging imaging-guided therapy

Measurement and Analysis of Production Performance of Rural Households in Jinzhai County, Anhui Province

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Forestry Studies in China 2004年第3期6卷 20-27页

作者： liucan ChinaNationalForestryEconomicsandDevelopmentResearchCenter Beijing100714P.R.China

Using a multi-input multi-output production technology and survey data from Jinzhai County, western Anhui Province, China, the author first measured the production performance of rural households their efficiency, economy of scale, and productivity during 19781997, and then related the measured production performance with institutional change, market access, and other factors. Preliminary results show that: 1) performance differs a great deal across households and over time; 2) institutional changes and market accessibility have played a major role in improving performance; 3) depending on the specific resources, their effects are variable.

关键词： Jinzhai production performance rural household total factor productivity Data Envelopment Analysis

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山西兴县石炭系本溪组煤岩特征及成煤环境

山西兴县石炭系本溪组煤岩特征及成煤环境

作者：刘灿成都理工大学

学位级别：硕士

山西兴县位于鄂尔多斯盆地东缘,是华北地块晚古生代煤的主力产煤区之一,其石炭-二叠系煤的地质勘探工作离不开煤地质学的研究。近年来,关于盆地东缘二叠系煤的煤岩特征、聚煤规律和成煤环境等系统研究日趋完善,而有关石炭系本溪组煤地... 详细信息

山西兴县位于鄂尔多斯盆地东缘,是华北地块晚古生代煤的主力产煤区之一,其石炭-二叠系煤的地质勘探工作离不开煤地质学的研究。近年来,关于盆地东缘二叠系煤的煤岩特征、聚煤规律和成煤环境等系统研究日趋完善,而有关石炭系本溪组煤地质学研究却很少涉及。本文在全工业分析、矿物学分析、煤岩组分分析和主微量元素分析的基础上,对山西兴县关家崖地区石炭系本溪组煤展开了较为系统的煤岩学、煤地球化学和成煤环境等方面的研究。山西兴县关家崖地区本溪组二段煤为低变质气煤,煤中水分及固定碳产率较低,灰分、挥发分、全硫及镜质组含量较高。煤岩结构疏松,矿物含量较高,以高岭石为主。在镜下,高岭石多呈条带状和团粒状分布。煤中富集Fe、K、Si、Al、V、Cr、Ni、Rb、Zr、Hf、U、La、Ce、Pr、Nd、Sm,亏损Na、Sr、Th,稀土元素Ce无异常,Eu呈弱负异常,配分模式曲线呈左倾和近水平两种形态,轻稀土元素分化严重。成煤环境表现为极潮湿强覆水的咸水沉积环境,成煤沼泽类型属于富营养低位泥炭沼泽。山西兴县关家崖地区本溪组一段煤为低变质气煤,煤中水分产率中等,灰分、固定碳及全硫含量较低,挥发分及镜质组含量较高。煤岩致密性较差,矿物含量较低,以高岭石为主。在镜下,高岭石主要以附着煤岩表面的方式赋存。煤中富集Mg、Ca、Na、Ni、Ba,亏损Mn、Ti、K、Cu、Zn、Rb、Nb、Hf、Ta、Th,稀土元素无Ce、Eu异常,重稀土元素含量稳定。成煤环境表现为潮湿覆水的咸水沉积环境,成煤沼泽类型属于贫营养高位泥炭沼泽。山西兴县关家崖地区本溪组二段成煤沼泽处于早期低位发育阶段,水体富营养化,因此煤中灰分及矿物含量较高于本溪组一段煤,进而造成煤中Al、Si、V、Cr、Rb、Nb、Hf、Ta、Cu含量较高。本溪组一段煤由于其吸水能力强,成煤植物喜Ca、亲Mg,古土壤贫Ti、贫Mn,因而在海水的影响下,煤中水分、Ca、Mg含量较高于本溪组二段煤,Ti、Mn含量则较低。兴县关家崖地区本溪组煤属于近海含煤岩系,其聚煤作用开始于海退期,终止于海侵期,由于成煤期海侵速度较快、泥炭累积厚度较小、成煤速度缓慢,所以煤层厚度较薄。在煤化作用期间,煤层长期处于低温、低压环境中,因此其变质程度低于唐公塔矿区太原组6号煤和双柳矿区山西组4号煤,进而造成煤中挥发分产率相对较高。此外,由于受海水影响较大,兴县关家崖地区本溪组煤表现高Ni特征。

关键词：本溪组煤地球化学特征成煤环境煤岩类型鄂尔多斯盆地东缘

4R理论下衍生综艺的传播策略分析--以《名侦探学院》为例

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艺术科技 2023年第18期36卷 150-152页

作者：丁刘璨上海理工大学上海200093

随着大众对综艺节目需求的快速增加,综艺节目制作规模逐步扩大,在此背景下衍生综艺应运而生。衍生综艺是由传媒母体延伸出的,与传媒母体具有高度关联性的综艺节目。作为一种备受当代年轻人喜爱的亚文化形式,其创作和经营通常依赖于年轻... 详细信息

随着大众对综艺节目需求的快速增加,综艺节目制作规模逐步扩大,在此背景下衍生综艺应运而生。衍生综艺是由传媒母体延伸出的,与传媒母体具有高度关联性的综艺节目。作为一种备受当代年轻人喜爱的亚文化形式,其创作和经营通常依赖于年轻受众群体的关注与支持。《名侦探学院》作为S级综艺项目《明星大侦探》的衍生综艺节目,是一档制作成本低、规模小的网络综艺衍生节目,却在激烈的网络综艺节目竞争中脱颖而出,备受好评,并且形成了极为稳定的粉丝群体和较长的综艺生命周期。4R组合策略理论强调经营者以竞争为导向,通过积极适应客户需求的变化、与客户建立长期而稳定的互动关系来赢得市场,并且追求各方互惠关系的最大化。文章基于4R理论,论述《名侦探学院》在关系、关联、反应、回报四个方面的传播策略,以期为网络视听文化产品的高质量发展提供借鉴和参考。从4R组合策略上看,《名侦探学院》利用录制频次密集、高频次的营业互动保持粉丝黏性;利用泛偶像化趋势,通过营销建立稳定的关系;顺应媒介权力流动趋势,赋予观众参与节目制作的地位和权力,实现了稳定的口碑和会员收入,对当代衍生综艺发展具有一定参考价值。

关键词：网络衍生综艺 4R理论传播策略衍生节目