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吸热峰
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  endothermic peak
     The DSC curve showed that besides two small endothermic peaks at about 204.23℃ and 225.48℃, one big endothermic peak appeared at about 24.36℃, and the peak temperature of transformation was about 98.54℃ with transformation enthalpy being 179.1 J/g, which indicated that the structure of the tested sample was mainly of branch-chain crystal.
     DSC吸热曲线显示,样品在24.36℃左右开始出现吸热峰,相变高峰温度约在98.54℃(相变焓179.1J/g),另外在204.23℃和225.48℃出现两个小的吸热峰,表明样品以支链晶体结构为主。
短句来源
     The characterization of the intermediate compound by XRD showed that the exothermic peak was attributed to the reduction of MoO 3 to MoO 2, and the endothermic peak could be assigned to the nitridation of MoO 2 to Mo 2N.
     用XRD对合成的中间产物进行表征 ,结果表明 ,DTA曲线中的放热峰可归属为由MoO3 转化为MoO2 的还原峰 ,吸热峰可归属为由MoO2 转化为γ Mo2 N的氮化峰。
短句来源
     the temperature of DTA exothermal peak has been promotedto 391 .9C with exothermal peak temperature extrapolated of 378.TC,the temperatureof DTA endothermic peak is 486.5 C with endothermic peak temperature extrapolatedis 475.8C.
     差热分析DTA放热峰温度提高到391.9℃,放热峰外推温度提高到了378.7℃,而吸热峰温度为486.5℃,吸热外推温度为475.8℃。
短句来源
     DSC results indicate that LaCl 3 promotes phase transition behavior of the LaCl 3/PU composites, which causes the endothermic peak at 11.58℃ to disappear.
     DSC的结果显示LaCl3 的加入使得PU体系的相转变行为发生了变化 ,位于 11 5 8℃的吸热峰消失。
短句来源
     the results show that the position of exothermic peak and endothermic peak of main crystalline Will also be defferent.
     结果表明,随Ta_2O_5取代La_2_3其主结晶相的放热峰或吸热峰的位置变化不同,所析出的结晶物质亦不同。
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  endothermic peaks
     DTA was used to study the α-Ca_3 (PO_4)_2 sample prepared at 1200℃ and cooled rapidly in air. It is found that there are two endothermic peaks in the vicinity of 216℃ and 1275℃ respectively, and each peak corresponds to a process of phase transformation, thus there are two new phases in Ca_3 (PO_4)_2 besides α, β phases.
     利用DTA研究了于1200℃合成的α-Ca_3(PO_4)_2急冷试样,发现在216℃和1275℃附近存在两个吸热峰,每个峰对应一个相变过程,说明Ca_3(PO_4)_2除α、β相外,还存在两个新相。
短句来源
     The DSC curve showed that besides two small endothermic peaks at about 204.23℃ and 225.48℃, one big endothermic peak appeared at about 24.36℃, and the peak temperature of transformation was about 98.54℃ with transformation enthalpy being 179.1 J/g, which indicated that the structure of the tested sample was mainly of branch-chain crystal.
     DSC吸热曲线显示,样品在24.36℃左右开始出现吸热峰,相变高峰温度约在98.54℃(相变焓179.1J/g),另外在204.23℃和225.48℃出现两个小的吸热峰,表明样品以支链晶体结构为主。
短句来源
     Results of TG-DTA showed that the KNO3 decomposed in two stages, corresponding to the main endothermic peaks at 873K and 973K.
     热重-差热(TG-DTA)结果显示KNO3分解经两个过程,分别对应873K和973K的吸热峰
短句来源
     shows two endothermic peaks at 119—156 and 740℃, and four weak endothermic peaks at 214, 246, 296 and 802℃.
     DTA曲线在119—156和740℃处有2个主要强吸热峰,在214,246,296和802℃处有4个弱吸热峰
短句来源
     Study on the Double Endothermic Peaks at T_g of PET
     PET玻璃化转变温度处双重吸热峰的研究
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  endothermal peaks
     But for the BA43.4-PPO/ PPO blend whose miscibility was unknown, there were two endothermal peaks during the annealing , and the Tg values of the two peaks were very close to those of pure components of BA43.4-PPO or PPO.
     而未知相容性的BA~(43.4)-PPO/PPO在等温退火过程中出现两个吸热峰,此两峰的T_p值随退火时间的变化类似于各纯组分相应条件下的变化.
短句来源
     For temperature rising rate of 4.2 and 40 ℃/min,both TG-DSC-T curves are similar in their endothermal peaks. For temperature rising rate of 4.2 ℃/min over 390 ℃,chemical reaction kinetics can not be expressed by traditional mathematical model and the reaction rate appears to be in a linear relation with reaction temperature.
     在4.2和40℃/min的升温速度下,两者反应的TG DSC T曲线有相似之处,均出现明显的吸热峰,而在390℃以后,升温速度为4.2℃/min时,热解反应动力学模型已经不能用传统的数学模型表示,其反应速率与升温速度显示了一个线性关系。
短句来源
     From DSC-TG analyzing,around 70.5 ℃ and 98.3 ℃ two volatile endothermal peaks appeare. There is an exothermic peak by oxidation and decomposition.
     DSC TG分析结果表明, 在 70 5℃和98 3℃附近出现两个挥发吸热峰, 失重 2 87%;
短句来源
     Thermal stability of nanocrystalline intermetallic compound Cu_4Al obtained from flow-levitation method is studied by means of DTA(Differential Thermal Analysis) and XRD(X-Ray Diffraction). By DTA experiments on Cu_4Al nanopowder,three endothermal peaks at 258 ℃,423 ℃ and 537 ℃ on DTA curve were found.
     对采用自悬浮定向流法制备的Cu4Al纳米微粉进行了差热分析(DTA),发现在258,423和537℃存在不同量值的吸热峰
短句来源
     The thermodynamic properties at low temperature of C60 single crystals grown by vapor transport method were studied by means of differential-scanning-calorimetry (DSC). The possible origin of the anomalous endothermal peaks of orientational transition is solvation whose effect is estimated to be 1.13 J · g-1. The procedure to purify the starting C60 powder was improved.
     用差示扫描量热法仔细研究了汽相法生长的C_6.单晶的低温热力学性质,发现引起相变吸热峰异常的原因可能是溶剂化效应,并估算了溶剂化效应的影响为1.13J·B~(-1).
短句来源
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  “吸热峰”译为未确定词的双语例句
     A small incipient melting peak on DSC curve of the composite appears and corresponds to the peritectic reaction of Al+CuAl2+Cu4Mg5Si4Alx→Liquid+Mg2Si at 785 K.
     DSC曲线上有一小的初期熔化吸热峰,其温度相应于偏晶反应:Al+Al2Cu+Cu4Mg5Si4Alx→液相+Mg2Si,785K;
短句来源
     The thermochromic process of the products was investigated by DSC,which shows three peaks of heat absorption at 40~60 ℃,100~130 ℃ and 130~150 ℃.
     DSC检测颜料的热变色过程得出:该系列变色颜料在40~60℃、100~130℃、130~150℃出现3个吸热峰
短句来源
     The results shows that there are two absorption energy belts corresponding with 489 - 496℃ and 554- 604℃, and there are only two single peaks when the content of In is 11wt% .
     结果表明:该合金在489-496℃处具有554-604℃两个明显的吸热带,添加11wt%的In时,其只存在496℃与603.6℃两个吸热峰
     The results shows that there are two absorption energy belts corresponding with 489~496 ℃ and 554~604 ℃, and there are only two single peaks when the content of In is 11wt%.
     结果表明:该合金在489~496℃处具有554~604℃两个明显的吸热带,添加11wt%的In时,其只存在496℃与603.6℃两个吸热峰
短句来源
     Result of DTA indicates that V2O5 has a phase transformation absorption peak at 655℃ while the signal of ESR of low valence of V ion is the strongest.
     差热分析显示,V2O5在655℃存在一相变吸热峰,此时样品的低价态V离子的ESR信号最强。
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  endothermic peak
One clearly detectable endothermic peak was revealed in the DSC curves of ice melting of CaCl2 and Na2SO4 solutions.
      
During the thermal analysis, the cross-linked co-polymers exhibited two exothermic peaks and one endothermic peak, indicating the presence of HTPB and GAP polymeric chain segments in the co-polymers.
      
In the second method, diclofenac (DH) is precipitated in acid medium and determined by the analysis of the endothermic peak (tp = 182?°C) in the DSC curve obtained in nitrogen atmosphere.
      
Differential scanning calorimetry showed the presence of a large endothermic peak at 42?°C, corresponding to the melting of the palm oil constituent, and a smaller second endotherm at 79-82?°C with the inclusion of starch at levels of up to 9% (w/w).
      
The changes in freezable bound water and total water contents in bread crumb were assessed by differential scanning calorimetry from water melting and evaporation endothermic peak areas.
      
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  endothermic peaks
DSC thermograms showed two endothermic peaks: a sharp peak at a lower temperature and a broad peak at a higher temperature.
      
Differential scanning calorimetry (DSC) thermograms of the polyurethanes resulted in two endothermic peaks, which shifted to higher temperatures with increasing starch content and -NCO/-OH molar ratio.
      
The temperature of endothermic peaks of dehydration remained almost unchanged regardless of slurry concentration but decreased with increasing compressive force exerted by grinding rings.
      
The homogeneity of the product is correlated with the temperature of exothermic peaks above 1100 K due to the crystallization of MgTiO3, but not with the endothermic peaks around 650 K.
      
In order to assess the endothermic peaks, protein samples were heated with different water contents.
      
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  endothermal peaks
The experimental results also provide valuable information: in the pH range from 5.26 to 9.04, two independent endothermal peaks were observed on DSC thermogram.
      
Nanoparticles of saturated monoacid triglycerides (smaller than 200?nm) exhibit uncommon melting behaviour, which is expressed in their differential scanning calorimetry curve by multiple endothermal peaks over a temperature range of about 10?°C.
      
One to three endothermal peaks atributted to melting of bulk and interfacial water were observed by DSC in the regenerated cellulose - water system.
      
DSC measurements showed endothermal peaks varying from 475-510° C depending on the CuO content.
      
DSC measurements showed endothermal peaks at 360, 520, 560 and 580 °C for this glass composition.
      
更多          


In the present work,the results of vacuum differential thermal analyses (DTA) of ammonium and hydrazinium nitrates obtained with a Japanese Shimadzu model DT-2A instrument are reported.For observing the effect of the change of heat transfer characteristics,the DTA experiment of ammonium nitrate is performed in air.Three changes of crystal structure on the vacuum DTA curve of ammonium nitrate are shown by the endothermic peaks at 52.8,87.7 and 126.7℃ respectively.The extrapolated on-set temperature is found to...

In the present work,the results of vacuum differential thermal analyses (DTA) of ammonium and hydrazinium nitrates obtained with a Japanese Shimadzu model DT-2A instrument are reported.For observing the effect of the change of heat transfer characteristics,the DTA experiment of ammonium nitrate is performed in air.Three changes of crystal structure on the vacuum DTA curve of ammonium nitrate are shown by the endothermic peaks at 52.8,87.7 and 126.7℃ respectively.The extrapolated on-set temperature is found to be 169.3℃ for the melting peak of the sample.The areas of these four peaks are larger than the corresponding ones in air.Its terminal endotherm on the vacuum DTA curve begins at 188℃.Under the similar conditions,there is an exotherm on the DTA curve of ammonium nitrate in air.The extrapolated on-set temperature is found to be 72.3℃ for the melting peak of hydrazinium nitrate.The terminal endotherm of the sample on the vacuum DTA curve begins at 190℃.The nitrates are evaporated partly and condensed on the cold surface of the quartz mantle during the vacuum DTA experiments.According to these facts and quantitative DTA theory,it is demonstrated that the melting peak is not masked and the exotherm does not change into the endotherm by the change of heat transfer characteristic from air to vacuum cases.According to thermochemical calculations in the present paper,it is concluded that Hodgkinson's reaction is exothermic.Accordingly,it is also concluded that the terminal endotherms on the vacuum DTA curves are the net result of the heat released during decomposition and heat absorbed upon volatilization of the liquid nitrates.Apparently,the heat of vaporization of the nitrates is the dominant factor in determining the terminal endotherms on the vacuum DTA curves.These conclusions are different from the interpretations in Breisacher's paper (1972) about vacuum DTA.

本文报道了NH_4NO_3和N_2H_5NO_3的真空差热分析(DTA)的结果。为观察热传递特性改变的影响,在空气中做了NH_4NO_3的DTA实验。在真空实验中,硝酸盐部分地蒸发并凝聚在石英罩管的冷表面上。依据这些事实及定量DTA理论,证明从空气到真空,热传递特性的改变不掩蔽熔融峰,而放热峰也不改变为吸热峰。依据热化学计算,断定Hodgkinson反应是放热反应。因此,推断真空DTA曲线终端的吸热峰是分解放出的热量和液态硝酸盐蒸发而吸收的热量的净结果。显然,硝酸盐的蒸发热是决定真空DTA曲线终端吸热峰的支配因素。这些结论皆不同于Breisacher的解释。

The crystal of ammonium bicarbonate belongs to orthorhombic system with symmetry 3L2 3PC. They exist in three forms: prismatic, slaty or particle shape. The crystals appear colorless to white or light grey, transparent to semitransparent. The cleavage parallel to (110) is perfect. Hardness H=1.55. Density D= 1.573 g/cm3. They are biaxial negative crystals, with Ng=c= 1.5540, Nm = b = 1.5355, Np =α=1.4220; 2V=40°56'. γ=v is weak. On the curves of DTA, there is a big and wide endothermic peak (between 50-150℃...

The crystal of ammonium bicarbonate belongs to orthorhombic system with symmetry 3L2 3PC. They exist in three forms: prismatic, slaty or particle shape. The crystals appear colorless to white or light grey, transparent to semitransparent. The cleavage parallel to (110) is perfect. Hardness H=1.55. Density D= 1.573 g/cm3. They are biaxial negative crystals, with Ng=c= 1.5540, Nm = b = 1.5355, Np =α=1.4220; 2V=40°56'. γ=v is weak. On the curves of DTA, there is a big and wide endothermic peak (between 50-150℃ ). The curves of TGA showed a continuous weight-loss. On the infrared absorption spectra, there are two strong peaks (3330-3030, 1430-1380), corresponding to the stretching and bending of the ions NH4+. And there are two less strong peaks (2850, 2550), corresponding to the stretching and bending of the anions HCO3-. The unit cell dimensions are α = 7.220(1)A, b=10.672(l)A,c = 8.719(2)A, v = 671.927(3)A3. There are eight moloculs in the unit cell and the space group is Pccn. Dx =1.5215. In the structure, the HCO3- anion groups are connected by hydrogen bonds to form chains parallel to c axes. The NH4+ ione groups constitute tetrahedrons connected by four chains of the HCO3- anions. In the crystal, there are two form of hydrogen bonds, namely O-H… O and N-H…O.

碳酸氢铵属于斜方晶系,晶形有柱状、板状和粒状三种习性。晶体呈无色或灰白色,透明-半透明,平行(100)解理完全,硬度为1.55;比重为1.573g/cm~3。二轴晶负光性,N_g=c=1.5540,N_m=b=1.5355,N_p=a=1.4220;2v=40°56′,r=v弱。在差热曲线上50—150℃之间出现一个大而宽的吸热峰,失重曲线上显示连续失重。根据红外吸收光谱表明在频率3330-3030;1430-1380两个强吸收峰为NH_4~+基团的伸缩与弯曲振动;2850,2550等强-中强峰示为HCO_3~-基团的伸缩与弯曲振动。根据四圆单晶衍射仪测得晶胞参数为a=7.220(1),b=10.672(1),c=8.719(2);v=671.925(3)~3;空间群为Pccn,z=8;D_x=1.5215。在结构中HCO_3~-形成链状氢键体系且平行c轴;NH_4~+形成正四面体,以氢键N—H…O方式与上下左右HCO_3~-链紧密联系。晶体内部存在O—H…O和N—H…O两种形式的氢键。由于两种氢键的性质不同,因此对碳酸氢铵晶体的易分解挥发,吸湿结块及热稳定性等性能密切相关。

Calorimetric investigations on the effect of fatty acids on hydration and thermaldenaturation of bovine serum albumin gave the following results.Hydration valueof BSA increased with increase in fatty acid content at all relative humidities.T_ddecreased with an increase in fatty acid content at lower relative humidities(R.H.<68%).However,both T_d and ΔH_d increased with an increase in the fatty acidcontent under higher relative humidities and solution states.

本文用差示扫描量热技术和热重分析技术分别测定了结合有不同脂肪酸的牛血清白蛋白在不同相对湿度下的水合值R、热变性温度T_D及变性焓ΔH_D。实验结果表明,在任一实验相对湿度下,脂肪酸含量的增加均导致牛血清白蛋白(简称BSA)的水合值增加,其增加程度因脂肪酸的种类而异;在低相对湿度下,脂肪酸含量的增加对BSA的热变性起敏化作用即使T_D降低;而在高相对湿度(例97%)及水溶液状态下,脂肪酸含量的增加对BSA的热变性起保护作用即使T_D增加,其影响程度为月桂酸>油酸>硬脂酸。月桂酸和油酸使BSA的ΔH_D增加,硬脂酸使其ΔH_D降低。实验还表明脂肪酸与低温吸热峰的出现无关。

 
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