The standard molar reaction enthalpy of the solid-solid coordination reaction, La(NO3)3· 6H2O (s) + 4Ala(s) (Ala is Alanine) =La(NO3)3. (Ala)4·H2O(s) + 5H2O(1), has been studied by the classical solution cal...The standard molar reaction enthalpy of the solid-solid coordination reaction, La(NO3)3· 6H2O (s) + 4Ala(s) (Ala is Alanine) =La(NO3)3. (Ala)4·H2O(s) + 5H2O(1), has been studied by the classical solution calorimetry. The molar dissolution enthalpies of the reactants and the products in 2 mol/L HCl of this solid-solid coordination reaction have been measured by using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpies of [La (NO3 )3. (Ala)4. H2O, s, 298.15 K] have been determined to be Hm [La (NO3)3. (Ala)4. H2O, s, 298. 15 K]= -3 864. 247 kJ/mol.展开更多
The oxygen evolution behavior in overcharged LiNil/3COl/3Mnl/3Oz-based electrode was investigated by differ- ential scanning calorimetry and thermal gravimetric （DSC/TG）. Meantime, its thermal kinetic parameters wer...The oxygen evolution behavior in overcharged LiNil/3COl/3Mnl/3Oz-based electrode was investigated by differ- ential scanning calorimetry and thermal gravimetric （DSC/TG）. Meantime, its thermal kinetic parameters were calculated by Kissinger＇s and Ozawa＇s method. As observed by DSC/TG, two exothermic peaks at 239 and 313℃ in washed cathode （4.6 V）, were attributed to two steps of oxygen evolution. More importantly, the temperature of its oxygen release processes decreased obviously compared with that charged to 2.8 V. Activation energy （E） for the first and second oxygen evolution, both of which were assumed closely to be the first order reaction, between 200 and 350℃ in Lio.2o4NilnCol/3Mnl/3O2-based electrode were calculated as 113.63 and 158.13 kJ.mo1-1, respectively and the corresponding Arrhenius pre-exponential factors （A） of 1.05 × 10^11 and 6.46× 10^13 s-1 were also obtained. The different energy barrier of such two steps of oxygen evolution should probably be ascribed to the different bond energy of M--O （M=Mn, Co, Ni）.展开更多
By using an LKB-2277 Bioactivity Monitor, we have deterthened the thermogenesis curves of two species of Brucellas arithmetic series growth. nom the thermogenesis curves, a thermokinetic equation as:could be establish...By using an LKB-2277 Bioactivity Monitor, we have deterthened the thermogenesis curves of two species of Brucellas arithmetic series growth. nom the thermogenesis curves, a thermokinetic equation as:could be established for bacterial arithmetic series growth in which the order of growth metabolism n=0. The mean specific rate constant of multiplication and the mean generation time G et al. were calculated. This model was compared with the exponentialmodel.展开更多
By using an LKB2277 Bioactivity Monitor,we have detedrined the thermogenesis power cu-rves of four kinds of Brucellas S2(55007), M5 (55009),83-202,83-980. And established the thermokinetic equation for the process of ...By using an LKB2277 Bioactivity Monitor,we have detedrined the thermogenesis power cu-rves of four kinds of Brucellas S2(55007), M5 (55009),83-202,83-980. And established the thermokinetic equation for the process of cell growth inlilbited by the products of metabolism, as:From this equation, the rate constants of cell growth k [= k0(1 - β’ P0)] were obtained.This thermokinetic equation is very suitable fdr cell growth of separated culture and is very important for the study of bacterial limited growth and their characteristics.展开更多
储热技术是利用蓄热材料储存热量然后在需要的时候释放,用以调节能源供应与能源需求在时间、空间或强度上的不匹配。该技术在太阳能热发电、工业余热回收、电子器件热管理、建筑节能等领域具有广泛的应用前景。为系统分析储热技术的发...储热技术是利用蓄热材料储存热量然后在需要的时候释放,用以调节能源供应与能源需求在时间、空间或强度上的不匹配。该技术在太阳能热发电、工业余热回收、电子器件热管理、建筑节能等领域具有广泛的应用前景。为系统分析储热技术的发展动态,以Web of Science数据库中收录的2007—2017年"Thermal energy storage"为主题的文献为数据源,借助信息可视化软件CiteSpace对所采集的数据进行分析,绘制出储热技术国家、机构和研究人员合作图谱,展示该技术研究力量的分布与科研合作情况;利用软件共现分析得到储热技术的热点科学领域,同时利用关键词共现网络图谱和文献共被引网络图谱分析了储热技术的研究热点、研究前沿及发展趋势,指出新型多尺度复合结构储热材料和混合储热模式是未来研究的重点。展开更多
Microcalorimetric bioassay for acute cellular toxicity is based on metabolicheat production from cultured cells. The biological response to toxicants is the inhibition of theheat production rate in cells, and toxicity...Microcalorimetric bioassay for acute cellular toxicity is based on metabolicheat production from cultured cells. The biological response to toxicants is the inhibition of theheat production rate in cells, and toxicity is expressed as the concentration of toxicant that is50% effective to this inhibition (IC_(50)). In this paper, the effect of Na_2SeO_3 on Bacillussubtilis growth was investigated at 37℃ by microcalorimetry. The relationship between growth rateconstants (k) and concentration of Na_2SeO_3(c) shows a logarithmic normal distribution, and IC_(50)is 20.3 μg/mL. All these thermokinetic information is readily obtained by an LKB 2277-204 heatconduction microcalorimeter. Microcalorimetry is a quantitative, inexpensive, and versatile methodfor toxicology research.展开更多
文摘The standard molar reaction enthalpy of the solid-solid coordination reaction, La(NO3)3· 6H2O (s) + 4Ala(s) (Ala is Alanine) =La(NO3)3. (Ala)4·H2O(s) + 5H2O(1), has been studied by the classical solution calorimetry. The molar dissolution enthalpies of the reactants and the products in 2 mol/L HCl of this solid-solid coordination reaction have been measured by using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpies of [La (NO3 )3. (Ala)4. H2O, s, 298.15 K] have been determined to be Hm [La (NO3)3. (Ala)4. H2O, s, 298. 15 K]= -3 864. 247 kJ/mol.
基金Project supported by the National Natural Science Foundation of China （No. 50542004） and Graduate Degree Thesis Innovation Foundation of Central South University （No. 1960-71131100017）.
文摘The oxygen evolution behavior in overcharged LiNil/3COl/3Mnl/3Oz-based electrode was investigated by differ- ential scanning calorimetry and thermal gravimetric （DSC/TG）. Meantime, its thermal kinetic parameters were calculated by Kissinger＇s and Ozawa＇s method. As observed by DSC/TG, two exothermic peaks at 239 and 313℃ in washed cathode （4.6 V）, were attributed to two steps of oxygen evolution. More importantly, the temperature of its oxygen release processes decreased obviously compared with that charged to 2.8 V. Activation energy （E） for the first and second oxygen evolution, both of which were assumed closely to be the first order reaction, between 200 and 350℃ in Lio.2o4NilnCol/3Mnl/3O2-based electrode were calculated as 113.63 and 158.13 kJ.mo1-1, respectively and the corresponding Arrhenius pre-exponential factors （A） of 1.05 × 10^11 and 6.46× 10^13 s-1 were also obtained. The different energy barrier of such two steps of oxygen evolution should probably be ascribed to the different bond energy of M--O （M=Mn, Co, Ni）.
文摘By using an LKB-2277 Bioactivity Monitor, we have deterthened the thermogenesis curves of two species of Brucellas arithmetic series growth. nom the thermogenesis curves, a thermokinetic equation as:could be established for bacterial arithmetic series growth in which the order of growth metabolism n=0. The mean specific rate constant of multiplication and the mean generation time G et al. were calculated. This model was compared with the exponentialmodel.
文摘By using an LKB2277 Bioactivity Monitor,we have detedrined the thermogenesis power cu-rves of four kinds of Brucellas S2(55007), M5 (55009),83-202,83-980. And established the thermokinetic equation for the process of cell growth inlilbited by the products of metabolism, as:From this equation, the rate constants of cell growth k [= k0(1 - β’ P0)] were obtained.This thermokinetic equation is very suitable fdr cell growth of separated culture and is very important for the study of bacterial limited growth and their characteristics.
文摘储热技术是利用蓄热材料储存热量然后在需要的时候释放,用以调节能源供应与能源需求在时间、空间或强度上的不匹配。该技术在太阳能热发电、工业余热回收、电子器件热管理、建筑节能等领域具有广泛的应用前景。为系统分析储热技术的发展动态,以Web of Science数据库中收录的2007—2017年"Thermal energy storage"为主题的文献为数据源,借助信息可视化软件CiteSpace对所采集的数据进行分析,绘制出储热技术国家、机构和研究人员合作图谱,展示该技术研究力量的分布与科研合作情况;利用软件共现分析得到储热技术的热点科学领域,同时利用关键词共现网络图谱和文献共被引网络图谱分析了储热技术的研究热点、研究前沿及发展趋势,指出新型多尺度复合结构储热材料和混合储热模式是未来研究的重点。
文摘Microcalorimetric bioassay for acute cellular toxicity is based on metabolicheat production from cultured cells. The biological response to toxicants is the inhibition of theheat production rate in cells, and toxicity is expressed as the concentration of toxicant that is50% effective to this inhibition (IC_(50)). In this paper, the effect of Na_2SeO_3 on Bacillussubtilis growth was investigated at 37℃ by microcalorimetry. The relationship between growth rateconstants (k) and concentration of Na_2SeO_3(c) shows a logarithmic normal distribution, and IC_(50)is 20.3 μg/mL. All these thermokinetic information is readily obtained by an LKB 2277-204 heatconduction microcalorimeter. Microcalorimetry is a quantitative, inexpensive, and versatile methodfor toxicology research.
