Influence of 235U enrichment on the moderator temperature coefficient of reactivity in a graphite-moderated molten salt reactor

To optimize the temperature coefficient of reactivity(TCR)for a graphite-moderated and liquid-fueled molten salt reactor,the effects of fuel salt composition on the fuel salt temperature coefficient of reactivity(FSTC)were investigated in our earlier work.In this study,we aim to provide a more comprehensive analysis of the TCR by considering the effects of the graphite-moderator temperature coefficient of reactivity(MTC).The effects of^235U enrichment and heavy metal(HM)proportion in the salt mixture on the MTC are investigated from the perspective of the six-factor formula based on a full-core model.For the MTC(labeled“αTM”),the temperature coefficient of the fast fission factors(αTM(ε))is positive,while those of the resonance escape probability(αTM(p)),the thermal reproduction factor(αTM(η)),the thermal utilization factor(αTM(f)),and the total non-leakage probability(αTM(A))are negative.The results reveal that the magnitudes ofαTM(ε)andαTM(p)for the MTC are similar.Thus,variations in the MTC with^235U enrichment for different HM proportions are mainly dependent onαTM(η),αTM(A),andαTM(f),but especially on the former two.To obtain a more negative MTC,a lower HM proportion and/or a lower 235U enrichment is recommended.Together with our previous studies on the FSTC,a relatively soft neutron spectrum could strengthen the TCR with a sufficiently negative MTC.

Effect of relative humidity at either acute or chronic moderate temperature on growth performance and droppings' corticosterone metabolites of broilers

The present study aimed to investigate the effect of relative humidity(RH) at either acute or chronic moderate ambient temperature(Ta) on growth performance and droppings' corticosterone metabolites of broilers.Two experiments were conducted: effect of RH(35,60 or 85%) on average daily feed intake(ADFI) and droppings' corticosterone metabolites at acute(1 d: 20–26 or 31–20°C,26 or 31°C for 6 h d–1 at 10:00–16:00) moderate Ta(experiment 1) and effect of RH(35,60 or 85%) on growth performance and droppings' corticosterone metabolites at chronic(step-wisely increasing temperature by 3°C every 3 d from 20 to 32°C within 15 d: 20–23–26–29–32°C) moderate Ta(experiment 2).Droppings were collected at the 2,4,6,8,and 22 h after Ta-RH controlled in experiment 1 and at the 2,4,6,and 22 h after Ta controlled to 32°C in experiment 2.The results showed that: 1) In experiment 1,85% RH increased(P<0.05) the droppings' corticosterone metabolites at the 2,6,8,and 22 h and 35% RH increased(P<0.05) it at the 2 and 22 h compared to the 60% RH.Moreover,85% RH further increased(P<0.05) it compared to the 35% RH,however,no difference(P>0.05) was found in ADFI among the three RH groups at acute moderate 26°C; 35 and 85% RH increased(P<0.05) droppings' corticosterone metabolites at the 2,6,8 and 22 h and decreased(P<0.05) ADFI compared to the 60% RH,moreover,85% RH further increased(P<0.05) droppings' corticosterone metabolites and further decreased(P<0.05) ADFI compared to the 35% RH at acute moderate 31°C; and the average of droppings' corticosterone metabolites in the whole period had a negative correlation(P<0.02) with the ADFI.2) In experiment 2,85% RH increased(P<0.01) droppings' corticosterone metabolites only at the 2 h and decreased(P<0.02) ADFI and average daily gain(ADG) compared to the 60% RH,no difference(P>0.05) in droppings' corticosterone metabolites was found between the 35 and 60% RH,however,35% RH decreased(P<0.01) ADG compared to the 60% RH,and the average of droppings' corticosterone metabolites in the whole period also had a negative correlation(P<0.02) with ADFI and ADG.In conclusion,droppings' corticosterone metabolites could be used as a RH stress index and low and high RH,especially high RH,reduced growth performance possibly through inducing RH stress at moderate temperature.

Moderate drought alleviates the damage to grain quality at high temperatures by improving the starch synthesis of inferior grains in japonica rice

In agricultural production,temperature and moisture are important factors affecting grain yield and quality.Although moderate drought at the grain-filling stage can effectively alleviate the damage caused by high temperature,the specific regulatory mechanism driving the effect of moderate drought at the high temperature on starch synthesis is still unclear.To explore the effects and mechanisms of high temperature and moderate drought on rice starch synthesis at the grainfilling stage,the activities of enzymes and expression levels of the genes involved in starch synthesis under four different treatments involving high temperature and/or water stress(CK,HT,WS,and HT+WS)were investigated in this study.The starch synthesis of a japonica inbred rice was measured under the four treatments during the grain filling.The results show that the effects of high temperature and moderate drought on grain filling mainly occur in the inferior grains of rice.Through the regulation of enzymes involved in starch synthesis and the expression levels of their main genes,the synthesis of rice starch can be affected.Therefore,the high temperature and moderate drought were antagonistic,and moderate drought can alleviate the damage to grain quality at a high temperature by improving the starch synthesis of inferior grains in japonica rice.This study provides a basis for stress-resistance cultivation and breeding strategies of rice with high temperature tolerance.

The Study of the Preparation of Catalysts for Carbonyl Sulfide Hydrolysis under Moderate Temperature

Multifunctional composite catalyst for carbonyl sulfide hydrolysis under moderate temperature was prepared by impregnation method. The hydrolysis and deoxidization ability of the prepared catalyst was investigated in a fixed bed reactor. It was found that deoxidization ability of the prepared catalyst was raised by the increase of the content of potassium loading catalyst and reaction temperature. And the concentration of H2S had no effect on deoxidization while COS improved the deoxidization ratio. And deoxidization rates were nearly scaled up with concentration of H2. The hydrolysis ability was decreased by the decrease of the surface basicity.

Experimental Performance of Moderate and High Temperature Heat Pump Charged with Refrigerant Mixture BY-3

Theoretical and experimental analysis of a new refrigerant mixture BY-3 was conducted based on a single-stage vapor compression refrigeration system. The water-water heat pump system used BY-3 to produce hot water when the low temperature was 20 ℃. The following results were obtained: the highest temperature at the condenser outlet reached about 85 ℃; when the difference between the water temperatures at the condenser outlet and the evaporator inlet was less than 40 ℃, the coefficient of performance (COP) was larger than 4; when the difference reached 55 ℃, the COP still kept 3; the discharge temperature of BY-3 was lower than 100 ℃, and the refrigerant vapor pressure kept lower than 1.8 MPa. When the water temperature at the condenser outlet reached over 85 ℃, nearly a 5 ℃ superheating temperature was maintained.

Moderately concentrated electrolyte enabling high-performance lithium metal batteries with a wide working temperature range

The electrolyte integrated with lithium metal anodes is subjected to the issues of interfacial compatibility and stability,which strongly influence the performances of high-energy lithium metal batteries.Here,we report a new electrolyte recipe viz.a moderately concentrated electrolyte comprising of 2.4 M lithium bis(fluorosulfonyl)imide(LiFSI)in a cosolvent mixture of fluorinated ethylene carbonate(FEC)and dimethyl carbonate(DMC)with relatively high ion conductivity.Owing to the preferential decomposition of LiFSI and FEC,an inorganic-rich interphase with abundant Li_(2)O and LiF nanocrystals is formed on lithium metal with improved robustness and ion transfer kinetics,enabling lithium plating/stripping with an extremely low overpotential of~8 mV and the average CE of 97%.When tested in Li||LiFePO_(4) cell,this electrolyte provides long-term cycling with a capacity retention of 98.3%after 1000 cycles at 1 C and an excellent rate performance of 20 C,as well as an areal capacity of 1.35 mA h cm^(-2)at the cathode areal loading of 9 mg cm^(-2).Moreover,the Li||LiFePO_(4) cell exhibits excellent wide-temperature performances(-40~60℃),including long-term cycling stability over 2600 cycles without visible capacity fading at 0℃,as well as extremely high average CEs of 99.6%and 99.8% over 400 cycles under-20℃ and 45℃.

Nanodiamond films deposited at moderate temperature on pure titanium substrate pretreated by ultrasonic scratching in diamond powder suspension

Nanocrystalline diamond （NCD） film deposition on pure titanium and Ti alloys is extraordinarily difficult because of the high diffusion coefficient of carbon in Ti, the large mismatch in their thermal expansion coefficients, the complex nature of the interlayer formed during diamond deposition, and the difficulty to achieve very high nucleation density. In this investigation, NCD films were successfully deposited on pure Ti substrate by using a novel substrate pretreatment of ultrasonic scratching in a diamond powder-ethanol suspension and by a two-step process at moderate temperature. It was shown that by scratching with a 30-μm diamond suspension for 1 h, followed by a 10-h diamond deposition, a continuous NCD film was obtained with an average grain size of about 200 nm. Detailed experimental results on the preparation, characterization, and successful deposition of the NCD films on Ti were discussed.

Aluminium-based moderate temperature filler metals for vacuum brazing of 6061 aluminium alloy

Four kinds of aluminum based moderate temperature filler metals used for vacuum brazing of 6061 aluminum alloy were prepared by rapid solidification-isothermal rolling.The effects of alloy elements content on the melting characteristics of filler metals was studied by Differential Scanning Calorimetry(DSC).The microstructures of the filler metals and brazed joints were observed by scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS).The results show that with the increase of Cu content into the filler metals,the liquid phase temperature gradually is decreased.Microstructure characterzation of the brazed joints shows the eutectic structure of(α+β)and(α+θ)decrease gradually,θ-CuAl_(2)(Ni)gradually increases and transforms from small fishbone shapes to block shapes.Peak shear strength of 83 MPa for the 6061 aluminum joint with Al-9.5Si-10Cu-2Ni-0.5Mg was achieved after brazing at 575℃for 2 min.

Relationship between Pepper Cultivars' Yields and High Temperatures with Pepper in Different Genotypes

[Objective] The aim was to research effects of high temperature stress on pepper yield by cultivation of peppers in different genotypes and provide theoretical references for pepper breeding and high-yield cultivation. [Method] Four pepper va- rieties were studied with varied genotypes to explore effects of temperatures on pepper fruiting and yield in the whole growth stage. [Result] The optimal-temperatre term for pepper blooming and fruiting were shorter. For example, the periods from June 16 to July 15 and from August 16 to September 15 would be the best, with temperature ranging from 20.70 ℃ to 30.74 ℃. In the stage from July 16 to August 15, the temperature range of 24.22 ℃-32.17 ℃ would severely affect pepper growth and yield. Pepper No. 1 and pepper No. 1-1＇s yields were just 38.21% and 51.74% of the yields in the stage 1st and 52.01% and 62.35% in the stage 3rd and eady No. 1 and late No. 1 were 48.1% and 72.38%, respectively. Under high tem- perature stress in summer, pepper No. 1, pepper No. 1-1, and late No. 1 showed extremely significant differences with early No. 1 （P〈0.01）. The yield ratios of pep- per No. 1 and pepper No. 1-1 in stage 1st （May 25-July 15） and the later three stages were 42.34：57.66 and 39.50：60.50; the ratio was 47.99：52.21 of early No. 1; the ratio of late No. 1 was 20.25：79.75. [Conclusion] The cultivation approaches should vary upon pepper variety, necessitating the focus on pepper management, fertilization, and irrigation, and locating peak-blooming term in moderate-temperature stage to accelerate pepper growth.

Dynamic Drought Monitoring in Guangxi Using Revised Temperature Vegetation Dryness Index

Moderate resolution imaging spectroradiometer （MODIS） data are very suitable for vast extent, long term and dynamic drought monitoring for its high temporal resolution, high spectral resolution and moderate spatial resolution. The composite Enhanced Vegetation Index （EVI） and composite land surface temperature （Ts） obtained from MODIS data MOD11A2 and MOD13A2 were used to construct the EVI-Ts space. And Temperature Vegetation Dryness Index （TVDI） was calculated to evaluate the agriculture drought in Guangxi province, China in October of 2006. The results showed that the drought area in Guangxi was evidently increasing and continuously deteriorating from the middle of September to the middle of November. The TVDI, coming from the EVI-Ts space, could effectively indicate the spatial distribution and temporal evolution of drought, so that it could provide a strong technical support for the forecasting agricultural drought in south China.

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&deg;C

The present study aims to further understanding of the principal reactions that occur during coal oxidation at moderate temperatures. Mass change and heat evolution of a sample were monitored by thermo-gravimetric analysis coupled with differential thermal analysis (TGA/DTA). Gaseous and solid products were traced using online or in situ Fourier trans- form infrared spectroscopy (FTIR). Measurements were conducted by heating the samples up to 400?C, with the O2 concentration in the reaction medium set at 0, 10, 21, and 40 vol%, respectively. It was observed that the mass increase of a sample between 150?C and ~275oC was a result of the accumulation of C=O containing species in the coal structure, whereas substantial mass loss and heat evolution of a sample at ~400oC can be attributed to the significant involvement of the direct “burn-off” reaction. Enrichment of O2 inthe reaction medium leads to the acceleration in oxygen chemi- sorption, formation and decomposition of the solid oxygenated complexes, as well as the “burn-off” reaction. With the temperature increasing, the oxidation process governed by oxygen chemisorption gradually shifts to that by significant decomposition reactions, and eventually to that by the direct “burn-off” reaction. Temperature boundaries of these stages can be determined using parameters defined based on a set of TG/DTA data. Shift in the governing reactions is essentially due to the diverse requirements of reactants of the reactions and their energy barriers to be overcome. In en- gineering practice, the phenomena of self-heating and spontaneous combustion of coal correspond to chemisorption and the direct “burn-off” reaction, respectively.

Influence of Sea Surface Temperature on Outbreak of Ulva prolifera in the Southern Yellow Sea,China

In this study,using Moderate Resolution Imaging Spectroradiometer(MODIS)satellite images and environmental satellite CCD images,the spatio-temporal distribution of Ulva prolifera in the southern Yellow Sea during the period of 2011–2018 was extracted and combined with MODIS Level3 Photosynthetically Active Radiation(PAR)product data and Earth System Research Laboratory(ESRL)Sea Surface Temperature(SST)data to analyze their influences on the growth and outbreak of Ulva prolifera.The following conclusions were drawn:1)comprehensive analysis of Ulva prolifera distribution during the eight-year period revealed that the coverage area of Ulva prolifera typically exhibited a gradually increasing trend.The coverage area of Ulva prolifera reached a maximum of approximately 1714.21 km^2 during the eight-year period in late June 2015.The area affected by Ulva prolifera fluctuated.In mid-July 2014,the area affected by Ulva prolifera reached a maximum of approximately 39020.63 km^2.2)The average growth rate of Ulva prolifera was positive in May and June but negative in July.During the outbreak of Ulva prolifera,the SST in the southern Yellow Sea tended to increase each month.The SST anomaly and average growth rate of Ulva prolifera were positively correlated in May(R^2=0.62),but not significantly correlated in June or July.3)The variation trends of PAR and SST were approximately the same,and the PAR during this time period maintained a range of 40–50 mol/(m^2·d),providing sufficient illumination for the growth and outbreak of Ulva prolifera.In addition,the abundant nutrients and suitable temperature in the sea area near northern Jiangsu shoal resulted in a high growth rate of Ulva prolifera in May.In summary,the outbreak of Ulva prolifera was closely related to the environmental factors including SST,nutrients,and PAR.Sufficient nutrients and suitable temperatures resulted in a fast growth rate of Ulva prolifera.However,under poor nutrient conditions,even more suitable temperatures were not sufficient to trigger an outbreak of Ulva prolifera.

Spatio-temporal Variation of Water Heat Flux Using MODIS Land Surface Temperature Product over Hulun Lake,China During 2001–2018

Heat flux is important for studying interactions between atmosphere and lake.The heat exchange between air-water interfaces is one of the important ways to govern the temperature of the water surface.Heat exchange between the air-water interfaces and the surrounding environment is completed by solar radiation,conduction,and evaporation,and all these processes mainly occur at the air-water interface.Hulun Lake was the biggest lake which is also an important link and an indispensable part of the water cycle in Northeast China.This study mapped surface energy budget to better understand spatial and temporal variations in Hulun Lake in China from 2001 to 2018.Descriptive statistics were computed to build a historical time series of mean monthly heat flux at daytime and nighttime from June to September during 2001–2018.Remote sensing estimation methods we used was suitable for Hulun Lake(R2=0.81).At month scale,shortwave radiation and latent heat flux were decrease from June to September.However,the maximum sensible heat flux appeared in September.Net longwave radiation was the largest in August.The effective heat budget showed that Hulun Lake gained heat in the frost-free season with highest value in June(686.31 W/m2),and then steadily decreased to September(439.76 W/m2).At annual scale,net longwave radiation,sensible heat flux and latent heat flux all show significant growth trend from 2001 to 2018(P<0.01).Wind speed had the well correlation on sensible heat flux and latent heat flux.Water surface temperature showed the highest coefficient in sensitivity analysis.

Remote Detection of Varying Water Storage in Relation to Surfacial Temperature of Aral Sea

Lake monitoring by remote sensing is of significant importance to understanding the lake and ambient ecological and environmental processes. In particular, whether lake water storage variation could predict lake surfacial temperature or vice versa has long fascinated the research community, in that it would greatly benefit the monitoring missions and scientific interpretation of the lake change processes. This study attempted to remotely detect the dynamics of the Aral Sea and pursue the relationships between varying lake water storage attributes and surface water temperature by using MODIS LST(Moderate-resolution Imaging Spectroradiometer Land Surface Temperature) 8-day composite products, satellite altimeter data, and actual meteorological measurements. Their associations with lake Surface Water Temperatures(SWT) were then analyzed. Results showed the lake water surface areas and elevations of the North Aral Sea tended to increasing trend from 2001(2793.0 km^2, 13.6 m) to 2015(6997.8 km^2, 15.9 m), while those of the South Aral Sea showed a decreasing trend during 2001(20 434.6 km^2, 3.9 m) and 2015(3256.1 km^2, 0.9 m). In addition, the annual daytime and nighttime lake SWT both decreased in the North Aral Sea, while only the daytime SWT in the South Aral Sea exhibited an increase, indicating a rising deviation of diurnal temperatures in the South Aral Sea during the past 15 yr. Moreover, a lower correlation was found between variations in the daytime SWT and storage capacity in the South Aral Sea(R^2 = 0.33;P < 0.05), no fair correlations were tested between lake water storage and daytime SWT in the North Aral Sea nor between lake water storage and nighttime SWT in either part of the sea. These results implied that climate change, if any at least during the research period, has no significant effects on lake dynamics over the two sectors of the Aral Sea with anthropogenic disturbances. However, climate change and human activities may overlap to explain complex consequences in the lake storage variations. Our results may provide a reference for monitoring the spatiotemporal variations of lakes, increasing understanding of the lake water storage changes in relation to the lake SWT, which may benefit the ecological management of the Aral Sea region, in the effort to face the likely threats from climate change and human activities to the region.

中高温热化学储热材料研究进展

可再生能源在利用过程中存在瞬时性、不稳定性以及供应与需求不匹配等问题。热化学储热技术具有储能密度大、储热温度高等特点,能够实现高效长时储热,可以将不稳定的可再生能源转化为稳定的中高温热能,并满足用户侧的波动需求。针对工作温度范围为400~1 100℃的中高温热化学储热材料,阐述了其分类、基本原理和特点,系统总结了碳酸盐、氢氧化物、氧化物、金属氢化物、氨和甲烷等典型热化学储热材料及其储热性能,分析了其结构定向调控及改性方法,并对典型的工程应用进行了介绍;分析了固-气和气-气反应体系的反应器设计及系统集成的研究进展,并针对优质热化学储能材料在开发及工业应用方面存在的问题,指出了未来的发展方向。

2001—2020年渭北黄土台塬区农业干旱变化特征及影响因素分析

为明晰渭北黄土台塬区2001—2020年间农业干旱的时空变化特征及影响因素,利用MODIS遥感数据构建了Ts-NDVI特征空间,计算出温度植被干旱指数(TVDI),以揭示干旱的时空演变规律。同时,借助地理探测器分析了干旱与自然因素及人类活动之间的关联,确定了影响TVDI空间分异性的关键因子。结果表明:该区域平均每年有65.04%的区域遭受不同程度的干旱,多年平均TVDI值为0.52,整体处于中旱状态,且春季干旱尤为严重;2001—2020年,该区域TVDI值呈现波动下降趋势,并表现出强持续性特征,约有91.38%的区域干旱情况得到缓解或保持稳定;TVDI的空间分异性显著,主要受到高程、气温、人口密度和NDVI等多个因子的综合影响;在不同年份,影响TVDI的主导因子组合有所变化,这反映出自然因素和人类活动对干旱影响的复杂性。需综合运用气候监测、生态恢复、优化农业生产结构和提高水资源利用效率等措施,以更精准地预测和缓解干旱对区域农业生产和社会经济的影响。

Research methods and performance analysis for the moderately high temperature refrigerant

In China, directly dropping high temperature refrigerant into conventional compressor is considered as a dominant technical route for development of moderately high temperature heat pump. Based on this route, selection criteria for high temperature refrigerant were presented with consideration of several influencing factors. Moreover, a set of research methods were built including theoretical calculations and experimental tests. Four high temperature refrigerants from HTR01 to HTR04 were compared and analyzed. In results, firstly, HTR03 and HTR04 belonging to non-ozone depleting refrigerants could bring outstanding environmental benefits; secondly, the condenser outlet water efficiently generated by heat pump using high temperature refrigerants could cover 60°C–90°C;; finally, the feasibility of the technical route and the research methods were proved.

一种铝基均热板的制造工艺研究

文中针对高功率器件的高效散热和轻量化设计需求,开展铝基均热板制造技术研究,设计了一种铝基均热板的成型工艺。利用钎焊烧结法制备一体化铝毛细芯,通过中温钎焊技术完成壳体封装,对烧结粉末成分、比例、烧结温度等工艺参数进行了优化,并对制备的样件进行了测试。测试结果表明,该工艺方案可获得厚度大于0.3 mm、孔隙率大于40%的结合强度大、均匀性好的铝毛细芯,制备的铝基均热板的当量导热系数大于1200 W,为铝基均热板的规模化生产提供了一种解决思路。

中低温活化条件下超级电容器用活性炭的制备与表征

以印尼褐煤为原料,KOH为活化剂,在400～580℃的中低温活化条件下制备出超级电容器用煤基活性炭,采用低温N2吸附、X射线衍射(XRD)及扫描电子显微镜(SEM)对其孔结构、微晶结构以及表面形貌等进行表征,并评价了其用作超级电容器电极材料的电化学性能。结果表明:在KOH活化制备煤基活性炭的活化过程中,KOH与煤中C的反应始于400～460℃;随着活化温度的升高,活性炭的比表面积及总孔容增大,孔径分布变宽,中孔率提高。当活化温度达到580℃时,所制活性炭的比表面积高达1 598 m2/g,总孔容达0.828 cm3/g,中孔率达41.4%,该活性炭用作电极材料在3 mol/L KOH电解液中具有良好的充放电性能,在50 mA/g的低电流密度下比电容高达369 F/g,在2 500 mA/g的高电流密度下比电容仍保持305 F/g,其漏电流仅为0.02 mA,且具有良好的循环性能,经1 000次循环后,比电容保持率超过92%,是一种理想的超级电容器电极材料。

持续偏热环境对肉鸡生长性能、糖脂代谢及解偶联蛋白mRNA表达的影响

本试验研究了持续不同温度处理(21、26和31℃)对肉鸡生长性能、血清糖脂代谢相关指标、胸肌和肝脏解偶联蛋白(avUCP)mRNA表达的影响。试验选取22日龄爱拔益加(AA)肉鸡144只转入环境控制舱,随机分成3组,每组6个重复,每个重复8只鸡(公母各4只)。适应期7d,温度21℃,相对湿度60%。29日龄时,试验温度分别调整到21、26和31℃,相对湿度60%,直至试验结束,共14d。结果表明:1)31℃组肉鸡平均日增重(ADG)、平均日采食量(ADFI)极显著低于21、26℃组(P<0.01),料重比(F/G)显著高于21、26℃组(P<0.05);26℃组肉鸡ADG、ADFI显著低于21℃组(P<0.05),F/G和21℃组无显著差异(P>0.05)。2)31℃组肉鸡血清葡萄糖(GLU)、总胆固醇(TC)、甘油三酯(TG)、游离脂肪酸(FFA)含量显著高于21℃组(P<0.05);26℃组血清生化指标与21℃组无显著差异(P>0.05)。3)31℃组肉鸡血清甲状腺素(T4)、瘦素(LEP)、皮质酮(CORT)含量显著高于21℃组(P<0.05);除T4含量外(P<0.05),26℃与21℃组之间血清激素指标无显著差异(P>0.05)。4)试验第7天,31℃组胸肌avUCP mRNA表达显著低于21、26℃组(P<0.05);第14天,26、31℃组胸肌avUCP mRNA表达极显著低于21℃组(P<0.01);试验第7、14天,31℃组肉鸡肝脏avUCP mRNA表达极显著高于21、26℃组(P<0.01)。综上,与21℃相比,持续偏热处理(26、31℃)影响肉鸡糖脂代谢及avUCP mRNA的表达,并显著降低生长性能,且不同偏热程度对肉鸡影响程度不同。