“事儿”是“事情”的口语化形式,带有轻松的意味。例如:①我跟你说个事儿。 “事儿”和“事情”的差别不仅表现在语体色彩上,而且也表现在词义范围、用法,甚至词性等方面。一般来说:“事情”所包含的义项,“事儿”都具备,在用法上“...“事儿”是“事情”的口语化形式,带有轻松的意味。例如:①我跟你说个事儿。 “事儿”和“事情”的差别不仅表现在语体色彩上,而且也表现在词义范围、用法,甚至词性等方面。一般来说:“事情”所包含的义项,“事儿”都具备,在用法上“事儿”可以代替“事情”,只是语体色彩不同罢了。但是“事儿”所包含的义项,“事情”就不完全具备,有时候“事儿”不能用“事情”来代替。例如“开车一定要小心,千万别出事儿。”这里的“事儿”是指“事故”,用“事情”就不太合适。再如“你得罪了他,他会找你的事儿。”这里的“事儿”是“麻烦”的意思,如果换用“事情”就说不通了。有些常用的短语如“闹事儿”、“惹事儿”、“找事儿”、“生事儿”、“怕事儿”中的“事儿”都不能用“事情”来代替。 “没事儿”这个短语常用来表示“没关系、不在乎”的意思。例如: ① 甲:累坏了吧,快歇歇儿。 乙:没事儿。 ② 甲:真对不起,把你的衣服弄脏了。 乙:没事儿。展开更多
A 1/3-scale reinfored concrete(RC) frame of unequal storey height with specially shaped columns was tested under low frequency cyclic loading.The damage characteristic,bearing capacity,deformation capacity and ductili...A 1/3-scale reinfored concrete(RC) frame of unequal storey height with specially shaped columns was tested under low frequency cyclic loading.The damage characteristic,bearing capacity,deformation capacity and ductility were analyzed.The restoring force model of the frame was obtained based on the study of the hysteresis curve measured in experiment,and the stiffness degeneration characteristics of every storey of the frame were analyzed.Finally the accumulated damage was analyzed with the damage assessment model.It is shown that the seismic behavior of this frame of unequal storey height with specially shaped columns is generally good,but the bottom of first floor column is a weak part,which should be paid more attention in design,and the restoring force model derived from this experiment can be seen as a valuable guide for design and non-linear finite element analysis for this kind of structure.展开更多
The principle of sonic wave measurement was introduced, and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test, using RSM-SY5 intelligent sonic wave apparat...The principle of sonic wave measurement was introduced, and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test, using RSM-SY5 intelligent sonic wave apparatus. The blasting test was carried out for ten times at some tunnels of Changba Lead-Zinc Mine. The damage depth of surrounding rock caused by old blasting excavation (0.8-1.2 m) was confirmed. The relation between the cumulative damage degree and blast times was obtained. The results show that the sonic velocity decreases gradually with increasing blast times, hut the damage degree (D) increases. The damage cumulative law is non-linear. The damage degree caused by blast decreases with increasing distance, and damage effects become indistinct. The blasting damage of rock mass is anisotropic. The damage degree of rock mass within charging range is maximal. And the more the charge is, the more severe the damage degree of rock mass is. The test results provide references for researches of mechanical parameters of rock mass and dynamic stability analysis of underground chambers.展开更多
After water is impounded in a reservoir, rock mass in the hydro-fluctuation belt of the reservoir bank slope is subject to water saturation- dehydration circulation (WSDC). To quantify the rate of change of rock mec...After water is impounded in a reservoir, rock mass in the hydro-fluctuation belt of the reservoir bank slope is subject to water saturation- dehydration circulation (WSDC). To quantify the rate of change of rock mechanical properties, samples from the Longtan dam area were measured with uniaxial compression tests after different numbers (1, 5, 10, 15, and 20) of simulated WSDC cycles. Based on the curves derived from these tests, a modified Hock- Brown failure criterion was proposed, in which a new parameter was introduced to model the cumulative damage to rocks after WSDC. A case of an engineering application was analyzed, and the results showed that the modified Hock-Brown failure criterion is useful. Under similar WSDC-influenced engineering and geological conditions, rock mass strength parameters required for analysis and evaluation of rock slope stability can be estimated according to this modified Hoek-Brown failure criterion.展开更多
This paper mainly investigates the effects of initial static shear stress and grain shape on the liquefaction induced large deformation of saturated sand under torsional shear.Nanjing sand,mainly composed of platy gra...This paper mainly investigates the effects of initial static shear stress and grain shape on the liquefaction induced large deformation of saturated sand under torsional shear.Nanjing sand,mainly composed of platy grains,is tested with different initial static shear stress ratio(SSR)using a hollow column torsional shear apparatus.The tests find that the saturated Nanjing sand reaches full liquefaction under the superposition of initial static shear stress and cyclic stress for both stress reversal and non-reversal cases.However,it requires a large number of loading cycles to reach full liquefaction if stress reversal does not occur.With increasing the initial static stress,the large deformation of the Nanjing sand should mainly induced by the cyclic liquefaction firstly under a smaller initial shear stress,and then it should be induced by the residual deformation failure.The critical point occurs approximately when the initial shear stress is close to the amplitude of the cyclic shear stress.Meanwhile,it shows that grain angularity increases the liquefaction resistance when the initial static shear stress is zero.A small initial static shear stress causes the larger loss of liquefaction resistance for angular sand than rounded sand.At a high initial SSR,the angular sand is more resistant to the large residual deformation failure than the rounded sand.展开更多
With the method of neural network, the processes of fatigue stiffness decreasing and deflection increasing of reinforced concrete beams under cyclic loading were simulated. The simulating system was built with the giv...With the method of neural network, the processes of fatigue stiffness decreasing and deflection increasing of reinforced concrete beams under cyclic loading were simulated. The simulating system was built with the given experimental data. The prediction model of neural network structure and the corresponding parameters were obtained. The precision and results were satisfied and could be used to investigate the fatigue properties of reinforced concrete beams in complex environment and under repeating loads.展开更多
The present research was conducted to study salinity effect on callus growth and regeneration from the local Chilli pepper cultivar as well as calli content of capsaicin, phenylalanine, proline and ascorbic acid. The ...The present research was conducted to study salinity effect on callus growth and regeneration from the local Chilli pepper cultivar as well as calli content of capsaicin, phenylalanine, proline and ascorbic acid. The results showed that the Pericarp gave the highest fresh and dry weight of 511.6 mg and 56.95 mg respectively at 9 dSm-1 compared with other interactions. Moreover the lowest fresh and dry weight was recorded for the root calli grown at 12 dSm-1. The highest regeneration percentage was 87.20% at 3 dSm-1 and the lowest was 6.70% at 9 dSm-1. For explant effect on regeneration, the highest percentage was 71.1% for shoot tips and the lowest was 23.30 % from the pericarp. However no plants were regenerated at 12 dSm-1 from all explants and at 9 dSm-1 from calli induced from roots, placenta and pericarps. Calli induced from Pericarp contain significantly higher Proline amount at 12 dSm-1 which was 34.65 μg/g and the lowest was 2.57 μg/g at 3 dSml. Moreover Phenylalanine ranged from 28.23 μg/g at 3 dSml and 41.50μg/g at 12 dSm1. While a wide range between the explants in the Ascorbic acid amount was recorded. The highest was 47.21 μg/g from the Placenta calli and the lowest was 0.98 μg/g from the Shoot tip calli. On the other hand calli produced from Placenta gave the highest amount of Capsaicin 53.11 μg/g at 9 dSm-1 which was not significantly different than the placenta and the pericarp at 12 dSml and the shoot tips, placenta and the pericarp at 9 μg/g. In conclusion Chili pepper callus tolerated salinity via the accumulation of Ascorbic acid, Proline, Phenylalanine and Capsaicin. Moreover Chili Pepper grown In vitro under salt stress contained high amount of Capsaicin the important pharmaceutical compound. Finally pepper plants were regenerated from salt stressed calli might be salt tolerant under field conditions.展开更多
文摘“事儿”是“事情”的口语化形式,带有轻松的意味。例如:①我跟你说个事儿。 “事儿”和“事情”的差别不仅表现在语体色彩上,而且也表现在词义范围、用法,甚至词性等方面。一般来说:“事情”所包含的义项,“事儿”都具备,在用法上“事儿”可以代替“事情”,只是语体色彩不同罢了。但是“事儿”所包含的义项,“事情”就不完全具备,有时候“事儿”不能用“事情”来代替。例如“开车一定要小心,千万别出事儿。”这里的“事儿”是指“事故”,用“事情”就不太合适。再如“你得罪了他,他会找你的事儿。”这里的“事儿”是“麻烦”的意思,如果换用“事情”就说不通了。有些常用的短语如“闹事儿”、“惹事儿”、“找事儿”、“生事儿”、“怕事儿”中的“事儿”都不能用“事情”来代替。 “没事儿”这个短语常用来表示“没关系、不在乎”的意思。例如: ① 甲:累坏了吧,快歇歇儿。 乙:没事儿。 ② 甲:真对不起,把你的衣服弄脏了。 乙:没事儿。
基金Project(50878141) supported by the National Natural Science Foundation of ChinaProject(Z2010250) supported by the Natural Science Foundation of Education Department of Hebei Province,China
文摘A 1/3-scale reinfored concrete(RC) frame of unequal storey height with specially shaped columns was tested under low frequency cyclic loading.The damage characteristic,bearing capacity,deformation capacity and ductility were analyzed.The restoring force model of the frame was obtained based on the study of the hysteresis curve measured in experiment,and the stiffness degeneration characteristics of every storey of the frame were analyzed.Finally the accumulated damage was analyzed with the damage assessment model.It is shown that the seismic behavior of this frame of unequal storey height with specially shaped columns is generally good,but the bottom of first floor column is a weak part,which should be paid more attention in design,and the restoring force model derived from this experiment can be seen as a valuable guide for design and non-linear finite element analysis for this kind of structure.
基金Project (50490272) supported by the National Natural Science Foundation of ChinaProject(040109) supported by the Doctor Degree Paper Innovation Engineering of Central South University
文摘The principle of sonic wave measurement was introduced, and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test, using RSM-SY5 intelligent sonic wave apparatus. The blasting test was carried out for ten times at some tunnels of Changba Lead-Zinc Mine. The damage depth of surrounding rock caused by old blasting excavation (0.8-1.2 m) was confirmed. The relation between the cumulative damage degree and blast times was obtained. The results show that the sonic velocity decreases gradually with increasing blast times, hut the damage degree (D) increases. The damage cumulative law is non-linear. The damage degree caused by blast decreases with increasing distance, and damage effects become indistinct. The blasting damage of rock mass is anisotropic. The damage degree of rock mass within charging range is maximal. And the more the charge is, the more severe the damage degree of rock mass is. The test results provide references for researches of mechanical parameters of rock mass and dynamic stability analysis of underground chambers.
基金supported by the National Natural Science Foundation of China under No. 41630639the National Basic Research Program of China (2014CB744703)+1 种基金Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JQ4014)China Postdoctoral Science Foundation (2016M602743)
文摘After water is impounded in a reservoir, rock mass in the hydro-fluctuation belt of the reservoir bank slope is subject to water saturation- dehydration circulation (WSDC). To quantify the rate of change of rock mechanical properties, samples from the Longtan dam area were measured with uniaxial compression tests after different numbers (1, 5, 10, 15, and 20) of simulated WSDC cycles. Based on the curves derived from these tests, a modified Hock- Brown failure criterion was proposed, in which a new parameter was introduced to model the cumulative damage to rocks after WSDC. A case of an engineering application was analyzed, and the results showed that the modified Hock-Brown failure criterion is useful. Under similar WSDC-influenced engineering and geological conditions, rock mass strength parameters required for analysis and evaluation of rock slope stability can be estimated according to this modified Hoek-Brown failure criterion.
基金supported by the National Natural Science Foundation of China(Nos.51778290,51778386)the National Science Fund for Distinguished Young Scholars(No.51725802)the Natural Science Foundation of Jiangsu High School(No.16KJA560001)。
文摘This paper mainly investigates the effects of initial static shear stress and grain shape on the liquefaction induced large deformation of saturated sand under torsional shear.Nanjing sand,mainly composed of platy grains,is tested with different initial static shear stress ratio(SSR)using a hollow column torsional shear apparatus.The tests find that the saturated Nanjing sand reaches full liquefaction under the superposition of initial static shear stress and cyclic stress for both stress reversal and non-reversal cases.However,it requires a large number of loading cycles to reach full liquefaction if stress reversal does not occur.With increasing the initial static stress,the large deformation of the Nanjing sand should mainly induced by the cyclic liquefaction firstly under a smaller initial shear stress,and then it should be induced by the residual deformation failure.The critical point occurs approximately when the initial shear stress is close to the amplitude of the cyclic shear stress.Meanwhile,it shows that grain angularity increases the liquefaction resistance when the initial static shear stress is zero.A small initial static shear stress causes the larger loss of liquefaction resistance for angular sand than rounded sand.At a high initial SSR,the angular sand is more resistant to the large residual deformation failure than the rounded sand.
基金Supported by Visiting Scholar Foundaion of Key Lab. in University and National Natural Science Foundation of China(5 0 0 780 0 9)
文摘With the method of neural network, the processes of fatigue stiffness decreasing and deflection increasing of reinforced concrete beams under cyclic loading were simulated. The simulating system was built with the given experimental data. The prediction model of neural network structure and the corresponding parameters were obtained. The precision and results were satisfied and could be used to investigate the fatigue properties of reinforced concrete beams in complex environment and under repeating loads.
文摘The present research was conducted to study salinity effect on callus growth and regeneration from the local Chilli pepper cultivar as well as calli content of capsaicin, phenylalanine, proline and ascorbic acid. The results showed that the Pericarp gave the highest fresh and dry weight of 511.6 mg and 56.95 mg respectively at 9 dSm-1 compared with other interactions. Moreover the lowest fresh and dry weight was recorded for the root calli grown at 12 dSm-1. The highest regeneration percentage was 87.20% at 3 dSm-1 and the lowest was 6.70% at 9 dSm-1. For explant effect on regeneration, the highest percentage was 71.1% for shoot tips and the lowest was 23.30 % from the pericarp. However no plants were regenerated at 12 dSm-1 from all explants and at 9 dSm-1 from calli induced from roots, placenta and pericarps. Calli induced from Pericarp contain significantly higher Proline amount at 12 dSm-1 which was 34.65 μg/g and the lowest was 2.57 μg/g at 3 dSml. Moreover Phenylalanine ranged from 28.23 μg/g at 3 dSml and 41.50μg/g at 12 dSm1. While a wide range between the explants in the Ascorbic acid amount was recorded. The highest was 47.21 μg/g from the Placenta calli and the lowest was 0.98 μg/g from the Shoot tip calli. On the other hand calli produced from Placenta gave the highest amount of Capsaicin 53.11 μg/g at 9 dSm-1 which was not significantly different than the placenta and the pericarp at 12 dSml and the shoot tips, placenta and the pericarp at 9 μg/g. In conclusion Chili pepper callus tolerated salinity via the accumulation of Ascorbic acid, Proline, Phenylalanine and Capsaicin. Moreover Chili Pepper grown In vitro under salt stress contained high amount of Capsaicin the important pharmaceutical compound. Finally pepper plants were regenerated from salt stressed calli might be salt tolerant under field conditions.