Aim In accordance with the positioning control for valve controlled motor electrohydraulic proportional servo systems driving the static load torque, the positioning performance was studied in the presence of the ti...Aim In accordance with the positioning control for valve controlled motor electrohydraulic proportional servo systems driving the static load torque, the positioning performance was studied in the presence of the time? varying deadzone and gain. Methods The large positioning errors caused by the time varying deadzone were significantly reduced by using the dynamic compensation method for the deadzone; and the large overshoot caused by the time varying gain were dramatically reduced by using the three section intelligent control schemes. Results Experimental results demonstrated that the positioning performance of rapid response, high accuracy and smaller or even no overshoot was achieved under a wide variations of load torque. Conclusion The good positioning performance for valve controlled motor servo systems has been achieved in the presence of the time varying deadzone and gain.展开更多
Given the background of a transmission tower erected on a particular mining subsidence area,we used finite element modeling to analyze the anti-deformation performance of transmission towers under a number of differen...Given the background of a transmission tower erected on a particular mining subsidence area,we used finite element modeling to analyze the anti-deformation performance of transmission towers under a number of different load conditions,including horizontal foundation displacement,uneven vertical downward displacement,wind loads and icing conditions.The results show that the failure in stability of a single steel angle iron represents the limit of the tower given ground deformation.We calculated the corresponding limits of foundation displacements.The results indicate that compression displacement of the foundation is more dangerous than tension displacement.Under complex foundation displacement conditions,horizontal foundation displacement is a key factor leading to failure in the stability of towers.Under conditions of compression or tension displacement of the foundation,wind load becomes the key factor.Towers do not fail when foundation displacements are smaller than 1% (under tension) or 0.5% (under horizontal compression or single foundation subsidence) of the distance between two supports.展开更多
The aim of this work is to evaluate the feasibility of applying the technology of oxidation-reduction potential （ORP） control on the municipal wastewater treatment system for nitrogen and phosphorus removal. Meanwhi...The aim of this work is to evaluate the feasibility of applying the technology of oxidation-reduction potential （ORP） control on the municipal wastewater treatment system for nitrogen and phosphorus removal. Meanwhile the relation between the optimal ORP （ ORPopt ） and influent C/N ratio was evaluated, in which the influent chemical oxygen demand （ COD ） concentration was stabilized at （290 ± 10 ） mg/L, the influent total phosphorus （TP） concentration was stabilized at （7.0 ± 0.5 ） mg/L. The results indicated that： （1） the ORP in the second anoxic zone had effect on nitrogen and phosphorus removal capability, and the average percentages of phosphorus uptake in ANO2 zone （ ηa ） increased with increasing ORP, i. e. , increasing from 12. 0% at - 143 mV to 22.0%,30.0%,37.0%, and45.0% at -123, -111, -105 and -95 mV, respectively; （2） the ORPopt as function of influent C/N ratio could be calculated by the equation： y ffi 252. 73e〈 -x/3.39） _ 131.01 ; the maximum percentage of phosphorus uptake in ANO2 as function of the ORPopt could be calculated by the equation： y ffi -0.49e（x/15.58） ＋ 1. 51. The ORPopt was the important process control parameter that must be optimized for operation of enhanced biological phosphorus removal （ EBPR ） system. Moreover, ORP sensor is very simple, and the industrial applications of this strategy is practical.展开更多
Objective： To directly examine the effects ofcarnosine on neuronal excitation and inhibition in rat hippocampus in vivo. Methods： Artificial cerebrospinal fluid with carnosine was directly administrated over the exp...Objective： To directly examine the effects ofcarnosine on neuronal excitation and inhibition in rat hippocampus in vivo. Methods： Artificial cerebrospinal fluid with carnosine was directly administrated over the exposed rat hippocampus. The changes of neuron activity in the CA1 region of hippocampus were evaluated by orthodromically- and antidromically-evoked potentials, as well as paired-pulse stimulation paradigm. Results： In both orthodromic and antidromic response potentials, carnosine transformed population spikes （PSs） with single spike into epileptiform multiple spikes. In addition, similar to the effect of 7-aminobutyric acidA （GABAA） antagonist picrotoxin, camosine decreased paired-pulse stimulating depression significantly. However, no significant change was observed in the spontaneous field potentials during the application of carnosine. Conclusion： The results indicate a disinhibition-induced excitation effect of carnosine on the CA1 pyramidal neurons. It provides important information against the application of carnosine as a potential anticonvulsant in clinical treatment.展开更多
Objective：To observe the clinical efficacy of Governor Vessel-unblocking and brain-refreshing scalp acupuncture for cerebral palsy （CP） complicated with intellectual disabilities. Methods：A total of 300 CP cases a...Objective：To observe the clinical efficacy of Governor Vessel-unblocking and brain-refreshing scalp acupuncture for cerebral palsy （CP） complicated with intellectual disabilities. Methods：A total of 300 CP cases aged between 1 and 5 years were randomly allocated into a treatment group （n=150） and a control group （n=150）. Patients in the treatment group were treated with Governor Vessel-unblocking and brain- refreshing scalp acupuncture combined with rehabilitation training, whereas patients in the control group received rehabilitation training alone. The Beijing Gesell developmental （Gesell） scale and gross motor function measure （GMFM） scale were used to assess the motor and intellectual development before and 3 months after the treatment. In addition, the head CT/MRI examination was applied to assess the brain nerve repair before and after the treatment. Results：After the treatment, the total effective rate in the treatment group was 78.0%, versus 42.7% in the control group, showing a statistical significance （P〈0.05）. As for scores of five subscales in the Gesell scale, there were significant intra-group differences in the treatment group （allP〈0.05）; and the scores in the treatment group were significantly better than those in the control group （allP〈0.05）. As for scores of five dimensions in GMFM scale, there were significant intra-group differences in the treatment group （allP〈0.05）; and the scores in the treatment group were significantly better than those in the control group （allP〈0.05）. According to the head CT/MRI findings, the total effective rate was 73.3% in the treatment group, versus 62.0% in the control group, showing a statistical significance （P〈0.05）. Conclusion：When used in combination with rehabilitative training, Governor Vessel-unblocking and brain-refreshing scalp acupuncture can significantly improve the clinical efficacy for cerebral palsy complicated with intellectual disabilities. It can also improve the patients＆#39; motor function, intelligence and language ability.展开更多
Objective：To observe and compare the therapeutic effect of two different needling methods,liver-soothing and mind-regulating needling method versus conventional needling method,in treating anxiety and depression in t...Objective：To observe and compare the therapeutic effect of two different needling methods,liver-soothing and mind-regulating needling method versus conventional needling method,in treating anxiety and depression in tension-type headache.Methods：A total of 120 patients with tension-type headache coupled with anxiety and/or depression were randomized into two groups according to the random number table,a liver-soothing andmind-regulating needling group （group A） and a conventional needling group （group B）,60 patients in each group.The self-rating anxiety scale （SAS） and self-rating depression scale （SDS） were used for evaluation before and after treatment.The therapeutic effects of the two groups were compared after 2-treatment courses.Results：The values of SAS and SDS both significantly dropped in the two groups （P0.01）,and the differences between the two groups after treatment were statistically significant （P0.01,P0.05）.The therapeutic effect in group A was superior to that in group B （P0.01）.The 3-month follow-up study showed that the liver-soothing andmind-regulating needling method had better long-term effect in improving anxiety and depression than the conventional needling method （P0.05）.Conclusion：The liver-soothing andmind-regulating needling method can effectively relieve the anxiety and depression symptoms in patients with tension-type headache,and the long-term effect is also satisfactory.展开更多
文摘Aim In accordance with the positioning control for valve controlled motor electrohydraulic proportional servo systems driving the static load torque, the positioning performance was studied in the presence of the time? varying deadzone and gain. Methods The large positioning errors caused by the time varying deadzone were significantly reduced by using the dynamic compensation method for the deadzone; and the large overshoot caused by the time varying gain were dramatically reduced by using the three section intelligent control schemes. Results Experimental results demonstrated that the positioning performance of rapid response, high accuracy and smaller or even no overshoot was achieved under a wide variations of load torque. Conclusion The good positioning performance for valve controlled motor servo systems has been achieved in the presence of the time varying deadzone and gain.
基金National Natural Science Foundation of China(No.50004008)Xuzhou Power Supply Company and the Fundamental Research Funds for the Central Universities(No.2011QNB18) for their financial and technical support for this work
文摘Given the background of a transmission tower erected on a particular mining subsidence area,we used finite element modeling to analyze the anti-deformation performance of transmission towers under a number of different load conditions,including horizontal foundation displacement,uneven vertical downward displacement,wind loads and icing conditions.The results show that the failure in stability of a single steel angle iron represents the limit of the tower given ground deformation.We calculated the corresponding limits of foundation displacements.The results indicate that compression displacement of the foundation is more dangerous than tension displacement.Under complex foundation displacement conditions,horizontal foundation displacement is a key factor leading to failure in the stability of towers.Under conditions of compression or tension displacement of the foundation,wind load becomes the key factor.Towers do not fail when foundation displacements are smaller than 1% (under tension) or 0.5% (under horizontal compression or single foundation subsidence) of the distance between two supports.
基金National Natural Science Foundation of China(NSFC)(No.50978118)
文摘The aim of this work is to evaluate the feasibility of applying the technology of oxidation-reduction potential （ORP） control on the municipal wastewater treatment system for nitrogen and phosphorus removal. Meanwhile the relation between the optimal ORP （ ORPopt ） and influent C/N ratio was evaluated, in which the influent chemical oxygen demand （ COD ） concentration was stabilized at （290 ± 10 ） mg/L, the influent total phosphorus （TP） concentration was stabilized at （7.0 ± 0.5 ） mg/L. The results indicated that： （1） the ORP in the second anoxic zone had effect on nitrogen and phosphorus removal capability, and the average percentages of phosphorus uptake in ANO2 zone （ ηa ） increased with increasing ORP, i. e. , increasing from 12. 0% at - 143 mV to 22.0%,30.0%,37.0%, and45.0% at -123, -111, -105 and -95 mV, respectively; （2） the ORPopt as function of influent C/N ratio could be calculated by the equation： y ffi 252. 73e〈 -x/3.39） _ 131.01 ; the maximum percentage of phosphorus uptake in ANO2 as function of the ORPopt could be calculated by the equation： y ffi -0.49e（x/15.58） ＋ 1. 51. The ORPopt was the important process control parameter that must be optimized for operation of enhanced biological phosphorus removal （ EBPR ） system. Moreover, ORP sensor is very simple, and the industrial applications of this strategy is practical.
基金Project (Nos. 30570585 and 30770548) supported by the National Natural Science Foundation of China
文摘Objective： To directly examine the effects ofcarnosine on neuronal excitation and inhibition in rat hippocampus in vivo. Methods： Artificial cerebrospinal fluid with carnosine was directly administrated over the exposed rat hippocampus. The changes of neuron activity in the CA1 region of hippocampus were evaluated by orthodromically- and antidromically-evoked potentials, as well as paired-pulse stimulation paradigm. Results： In both orthodromic and antidromic response potentials, carnosine transformed population spikes （PSs） with single spike into epileptiform multiple spikes. In addition, similar to the effect of 7-aminobutyric acidA （GABAA） antagonist picrotoxin, camosine decreased paired-pulse stimulating depression significantly. However, no significant change was observed in the spontaneous field potentials during the application of carnosine. Conclusion： The results indicate a disinhibition-induced excitation effect of carnosine on the CA1 pyramidal neurons. It provides important information against the application of carnosine as a potential anticonvulsant in clinical treatment.
基金supported by Project of Guangdong Provincial Administration of Traditional Chinese Medicine No.20131055~~
文摘Objective：To observe the clinical efficacy of Governor Vessel-unblocking and brain-refreshing scalp acupuncture for cerebral palsy （CP） complicated with intellectual disabilities. Methods：A total of 300 CP cases aged between 1 and 5 years were randomly allocated into a treatment group （n=150） and a control group （n=150）. Patients in the treatment group were treated with Governor Vessel-unblocking and brain- refreshing scalp acupuncture combined with rehabilitation training, whereas patients in the control group received rehabilitation training alone. The Beijing Gesell developmental （Gesell） scale and gross motor function measure （GMFM） scale were used to assess the motor and intellectual development before and 3 months after the treatment. In addition, the head CT/MRI examination was applied to assess the brain nerve repair before and after the treatment. Results：After the treatment, the total effective rate in the treatment group was 78.0%, versus 42.7% in the control group, showing a statistical significance （P〈0.05）. As for scores of five subscales in the Gesell scale, there were significant intra-group differences in the treatment group （allP〈0.05）; and the scores in the treatment group were significantly better than those in the control group （allP〈0.05）. As for scores of five dimensions in GMFM scale, there were significant intra-group differences in the treatment group （allP〈0.05）; and the scores in the treatment group were significantly better than those in the control group （allP〈0.05）. According to the head CT/MRI findings, the total effective rate was 73.3% in the treatment group, versus 62.0% in the control group, showing a statistical significance （P〈0.05）. Conclusion：When used in combination with rehabilitative training, Governor Vessel-unblocking and brain-refreshing scalp acupuncture can significantly improve the clinical efficacy for cerebral palsy complicated with intellectual disabilities. It can also improve the patients＆#39; motor function, intelligence and language ability.
文摘Objective：To observe and compare the therapeutic effect of two different needling methods,liver-soothing and mind-regulating needling method versus conventional needling method,in treating anxiety and depression in tension-type headache.Methods：A total of 120 patients with tension-type headache coupled with anxiety and/or depression were randomized into two groups according to the random number table,a liver-soothing andmind-regulating needling group （group A） and a conventional needling group （group B）,60 patients in each group.The self-rating anxiety scale （SAS） and self-rating depression scale （SDS） were used for evaluation before and after treatment.The therapeutic effects of the two groups were compared after 2-treatment courses.Results：The values of SAS and SDS both significantly dropped in the two groups （P0.01）,and the differences between the two groups after treatment were statistically significant （P0.01,P0.05）.The therapeutic effect in group A was superior to that in group B （P0.01）.The 3-month follow-up study showed that the liver-soothing andmind-regulating needling method had better long-term effect in improving anxiety and depression than the conventional needling method （P0.05）.Conclusion：The liver-soothing andmind-regulating needling method can effectively relieve the anxiety and depression symptoms in patients with tension-type headache,and the long-term effect is also satisfactory.
