Microsatellites have been widely applied in the fields of communication,remote sensing,navigation and science exploration due to its characteristics of low cost,flexible launch mode and short development period.Howeve...Microsatellites have been widely applied in the fields of communication,remote sensing,navigation and science exploration due to its characteristics of low cost,flexible launch mode and short development period.However,conventional solid-propellant have difficulties in starting and interrupting combustion because combustion is autonomously sustained after ignition Herein,we proposed a new type of solid-propellant named laser-controlled solid propellant,which is sensitive to laser irradiation and can be started or interrupted by switching on/off the continuous wave laser.To demonstrate the feasibility and investigate the controllable combustion behaviors under different laser on/off conditions,the combus tion parameters including burning rate,ignition delay time and platform pressure were tested using pressure sensor,high-speed camera and thermographic camera.The results showed that the increase of laser-on or laser-off duration both will lead to the decrease of propellant combustion performance during re-ignition and re-combustion process.This is mainly attributed to the laser attenuation caused by the accumulation of combustion residue and the change of chamber ambient temperature.Simultaneously the multiple ignition tests revealed that the increased chamber ambient temperature after combustion can make up for the energy loss of laser attenuation and expansion of chamber cavity.However,the laser-controlled combustion performance of solid propellant displayed a decrease trend with the addi-tion of ignition times.Nevertheless,the results still exchibited good laser-controlled agility of laser-controlled solid propellant and manifested its inspiring potential in many aspects of space missions.展开更多
Objective:To evaluate the efficacy and safety of a Chinese medicine(CM)Modified Qufeng Runmian Powder(加减祛风润面散,MQFRMP)for the treatment of acne vulgaris with CM syndromes of dampness and blood stasis.Methods:In ...Objective:To evaluate the efficacy and safety of a Chinese medicine(CM)Modified Qufeng Runmian Powder(加减祛风润面散,MQFRMP)for the treatment of acne vulgaris with CM syndromes of dampness and blood stasis.Methods:In this multicenter,randomized,double-blind,placebo-controlled clinical trial,220 acne vulgaris patients with CM syndrome of dampness and blood stasis were included and randomly assigned using a central area group random design to receive either MQFRMP or the placebo,with 110 cases in each group.MQFRMP or a placebo at 145 g/bag were administered once daily for 4 weeks,respectively.The primary index of efficacy was the effective rate according to the acne severity score(ASS).The secondary indices of efficacy included the changes in the dermatology life quality index(DLQI)score,VISIA scores(spots,pores,brown spots,porphyrins and red areas)and skin assessment(skin p H,sebum amount and hydration)according to a SOFT skin multianalyzer.Results:(1)Follow-up:a total of 204 patients completed the follow-up,with 103 in the treatment group and 101 in the control group.(2)Effective rate:the total effective rate of the treatment group was significantly higher than the control group[83.5%(86/103)vs.31.7%(32/101),P<0.01)]with 95%confidence interval of 39.3%–66.4%.(3)DLQI:DLQI scores were significantly decreased the treatment and control groups(both P<0.01),but the treatment group was more obvious than the placebo group(P<0.01).(4)VISIA scores:the scores of spots,brown spots and red areas in the treatment group decreased compared with baseline(P<0.05).In the control group,the scores of brown spots and pores decreased compared with baseline(P<0.05).The improvement was more obvious in the treatment group than in the control group for all items(P<0.05).(5)Skin assessment:the p H and sebum score in the both groups decreased drastically compared with the baseline(all P<0.01),however,the improvement was more obvious in the treatment group than in the control group(P<0.01).The hydration amount in the two groups showed no statistically significant difference compared with the baseline(both P>0.05).(6)Safety:two cases of mild drug allergy were observed in the treatment group.Conclusion:MQFRMP was effective and safe for the treatment of acne vulgaris with syndromes of dampness and blood stasis.(No.ChiCTR1900020479).展开更多
Chitosan/α,β-glycerophosphate (CS/α,β-GP) thermo-sensitive hydrogels presented flowable solution state at low temperature and semisolid hydrogel when the ambient temperature increased. In this research, differen...Chitosan/α,β-glycerophosphate (CS/α,β-GP) thermo-sensitive hydrogels presented flowable solution state at low temperature and semisolid hydrogel when the ambient temperature increased. In this research, different concentrations of metronida- zole encapsulated, CS and α,β-GP, as well as different acid solvents, were chosen to evaluate their influences on the drug release behaviors from CS/α,β-GP hydrogels. It was found that there was a sustaining release during the first 3 h followed by a plateau. SEM images showed that drugs were located both on the surface and in the interior of hydrogels. The optimal preparation conditions of this hydrogel for drug release were as follows: 1.8% (w/v) CS in HAc solvent, 5.6% (w/v) a, 13-GP and 5g/L metronidazole encapsulation. Cytotoxicity evaluation found no toxic effect. In order to control the release rate, 2.5 g/L chitosan microspheres with spherical shape and smooth surface were incorporated, and it was found that the initial release process was alleviated, while drug concentration had no obvious effect on the release rate. It could be concluded that the metronidzole release behaviors could be optimized according to practical applica- tions.展开更多
OBJECTIVE: To examine German controlled clinical trials on the therapeutic effects of acupuncture vs sham acupuncture, and to find whether there are problems with the conclusion that sham acupuncture has no significan...OBJECTIVE: To examine German controlled clinical trials on the therapeutic effects of acupuncture vs sham acupuncture, and to find whether there are problems with the conclusion that sham acupuncture has no significant deviation from acupuncture. METHODS: We focused on literature from the last ten years (2002-2011) included in PubMed about controlled clinical trials on acupuncture vs sham acupuncture carried out in Germany. The methods applied in sham acupuncture are summarized, and the difference between the acupuncture and sham groups were analyzed. We measured effects based on the following criteria: acupuncture is effective and superior to sham, acupuncture is effective but similar to sham, both of them have uncertainty regarding treatment effect, or no significant effect. Finally, we reviewed the hypotheses of different scholars on sham acupuncture and analyzed their results.RESULTS: Four types of controlled clinical trials including sham acupuncture on non-Traditional Chinese Medicine acupoints, minimal acupuncture on non-acupoints, placebo needle and sham laser acupuncture had varying results in the 57 articles analyzed. Some showed that acupuncture had a better effect than sham, while some suggest acupuncture and sham had similar effects. In all studies using sham acupuncture on non-therapeutic points, sham electrodes, and sham electro-acupuncture, the therapeutic effect was better than sham. Of the trials, 37 demonstrated that acupuncture had a better effect than sham acupuncture. Only nine trials found no significant difference between acupuncture and sham. Two controlled trials for the same condition (neck pain) conducted by two different German research institutes used the same control method, but reached contradictory conclusions. CONCLUSION: We found problems in conclusions based on results of controlled clinical trials of sham acupuncture in Germany. Therefore, there is still not enough evidence to support the statements that "acupuncture and sham acupuncture have no difference in treatment effect" and "acupuncture is just a placebo effect." The control methods of sham acupuncture used in Germany may not be standardized and may not be suitable for acupuncture clinical trial research. We suggest that research on the methodology of sham acupuncture should be given priority in the design of acupuncture trials in the future.展开更多
OBJECTIVE: To investigate the effects of transcutaneous electrical nerve stimulation(TENS) through acupoints on the intraocular pressure(IOP) in patients with glaucoma.METHODS: A single-blinded, randomized experimenta...OBJECTIVE: To investigate the effects of transcutaneous electrical nerve stimulation(TENS) through acupoints on the intraocular pressure(IOP) in patients with glaucoma.METHODS: A single-blinded, randomized experimental design study was conducted. Patients from the North of Taipei Ophthalmology outpatient department diagnosed with intraocular hypertension were selected and were further enrolled if they met the research subject criteria. The patients who met all criteria, and who met no exclusion criteria became the participants. Participants were randomly assigned into the treated group, wherein the TENS electrodes(Qing Ming Medical Device Co., Ltd.,New Taipei City, China) were applied with direct current(DC) on the acupoints Pucan(BL 61) and Shenmai(BL 62) for 20 min. The control group received no TENS electrode treatments. Measurements of IOP were taken four times using a pneumotonometer(Clinico Co., Ltd., New Taipei City, China), before,immediately after, 30 min after, and 60 min after TENS electrode treatments.RESULTS: Eighty-two participants completed the experiment. IOP decreased more in the group treated with DC(P < 0.01) than in the control group. The IOPs were not affected by the age of the patients and their usage of medications.CONCLUSION: TENS of acupoints of Pucan(BL 61)and Shenmai(BL 62) could significantly reduce the IOP in patients with glaucoma.展开更多
OBJECTIVE: To assess the efficacy and safety of Chinese patent medicine(CPM) with the principle of tonifying Qi, promoting blood circulation by removing blood stasis, and resolving phlegm(TQ-PBC-RP)in the management o...OBJECTIVE: To assess the efficacy and safety of Chinese patent medicine(CPM) with the principle of tonifying Qi, promoting blood circulation by removing blood stasis, and resolving phlegm(TQ-PBC-RP)in the management of stable chronic obstructive pulmonary disease(COPD).METHODS: A systematic review of randomized controlled trials(RCTs) identified from electronic databases and print was conducted. RCTs testing CPMs with TQ-PBC-RP against any type of controlled intervention in patients with stable COPD and assessing clinically relevant outcomes were included. Methodological quality was evaluated with the risk of bias tool according to systematic review handbook 5.0.2. Quality of evidence was estimatedby the rating approach developed by the Grading of Recommendations, Assessment, Development,and Evaluation Working Group.RESULTS: Thirteen eligible RCTs with 12 oral CPMs were tested. Significant differences between groups in favor of CPMs were not reported in all trials. Most trials included were deemed to be of low methodological quality with poor evidence quality.Because of large data heterogeneity, statistical pooling was not performed for all outcomes.CONCLUSION: The effectiveness of CPM in the treatment of stable COPD is not supported by evidence. Currently, evidence from RCTs is scarce and methodologically weak. Considering the popularity of CPMs among patients undergoing COPD, rigorously designed trials are warranted.展开更多
基金This work was supported by the Shanghai Aerospace Science&Technology Innovation Fund[grant number SAST201363],and the Fundamental Research Funds for the Central Universities[grant number 30919012102 in part]We gratefully acknowledge the technical support provided by Hao-yu Wang,Wei-kang Chen and Zhi-jing Xu(Shanghai Space Propulsion Technology Research Institute,China).
文摘Microsatellites have been widely applied in the fields of communication,remote sensing,navigation and science exploration due to its characteristics of low cost,flexible launch mode and short development period.However,conventional solid-propellant have difficulties in starting and interrupting combustion because combustion is autonomously sustained after ignition Herein,we proposed a new type of solid-propellant named laser-controlled solid propellant,which is sensitive to laser irradiation and can be started or interrupted by switching on/off the continuous wave laser.To demonstrate the feasibility and investigate the controllable combustion behaviors under different laser on/off conditions,the combus tion parameters including burning rate,ignition delay time and platform pressure were tested using pressure sensor,high-speed camera and thermographic camera.The results showed that the increase of laser-on or laser-off duration both will lead to the decrease of propellant combustion performance during re-ignition and re-combustion process.This is mainly attributed to the laser attenuation caused by the accumulation of combustion residue and the change of chamber ambient temperature.Simultaneously the multiple ignition tests revealed that the increased chamber ambient temperature after combustion can make up for the energy loss of laser attenuation and expansion of chamber cavity.However,the laser-controlled combustion performance of solid propellant displayed a decrease trend with the addi-tion of ignition times.Nevertheless,the results still exchibited good laser-controlled agility of laser-controlled solid propellant and manifested its inspiring potential in many aspects of space missions.
文摘Objective:To evaluate the efficacy and safety of a Chinese medicine(CM)Modified Qufeng Runmian Powder(加减祛风润面散,MQFRMP)for the treatment of acne vulgaris with CM syndromes of dampness and blood stasis.Methods:In this multicenter,randomized,double-blind,placebo-controlled clinical trial,220 acne vulgaris patients with CM syndrome of dampness and blood stasis were included and randomly assigned using a central area group random design to receive either MQFRMP or the placebo,with 110 cases in each group.MQFRMP or a placebo at 145 g/bag were administered once daily for 4 weeks,respectively.The primary index of efficacy was the effective rate according to the acne severity score(ASS).The secondary indices of efficacy included the changes in the dermatology life quality index(DLQI)score,VISIA scores(spots,pores,brown spots,porphyrins and red areas)and skin assessment(skin p H,sebum amount and hydration)according to a SOFT skin multianalyzer.Results:(1)Follow-up:a total of 204 patients completed the follow-up,with 103 in the treatment group and 101 in the control group.(2)Effective rate:the total effective rate of the treatment group was significantly higher than the control group[83.5%(86/103)vs.31.7%(32/101),P<0.01)]with 95%confidence interval of 39.3%–66.4%.(3)DLQI:DLQI scores were significantly decreased the treatment and control groups(both P<0.01),but the treatment group was more obvious than the placebo group(P<0.01).(4)VISIA scores:the scores of spots,brown spots and red areas in the treatment group decreased compared with baseline(P<0.05).In the control group,the scores of brown spots and pores decreased compared with baseline(P<0.05).The improvement was more obvious in the treatment group than in the control group for all items(P<0.05).(5)Skin assessment:the p H and sebum score in the both groups decreased drastically compared with the baseline(all P<0.01),however,the improvement was more obvious in the treatment group than in the control group(P<0.01).The hydration amount in the two groups showed no statistically significant difference compared with the baseline(both P>0.05).(6)Safety:two cases of mild drug allergy were observed in the treatment group.Conclusion:MQFRMP was effective and safe for the treatment of acne vulgaris with syndromes of dampness and blood stasis.(No.ChiCTR1900020479).
文摘Chitosan/α,β-glycerophosphate (CS/α,β-GP) thermo-sensitive hydrogels presented flowable solution state at low temperature and semisolid hydrogel when the ambient temperature increased. In this research, different concentrations of metronida- zole encapsulated, CS and α,β-GP, as well as different acid solvents, were chosen to evaluate their influences on the drug release behaviors from CS/α,β-GP hydrogels. It was found that there was a sustaining release during the first 3 h followed by a plateau. SEM images showed that drugs were located both on the surface and in the interior of hydrogels. The optimal preparation conditions of this hydrogel for drug release were as follows: 1.8% (w/v) CS in HAc solvent, 5.6% (w/v) a, 13-GP and 5g/L metronidazole encapsulation. Cytotoxicity evaluation found no toxic effect. In order to control the release rate, 2.5 g/L chitosan microspheres with spherical shape and smooth surface were incorporated, and it was found that the initial release process was alleviated, while drug concentration had no obvious effect on the release rate. It could be concluded that the metronidzole release behaviors could be optimized according to practical applica- tions.
基金Supported by the Program of China Academy of Chinese Medical Sciences for Young Researchers in Medical Science(No.ZZ040305)
文摘OBJECTIVE: To examine German controlled clinical trials on the therapeutic effects of acupuncture vs sham acupuncture, and to find whether there are problems with the conclusion that sham acupuncture has no significant deviation from acupuncture. METHODS: We focused on literature from the last ten years (2002-2011) included in PubMed about controlled clinical trials on acupuncture vs sham acupuncture carried out in Germany. The methods applied in sham acupuncture are summarized, and the difference between the acupuncture and sham groups were analyzed. We measured effects based on the following criteria: acupuncture is effective and superior to sham, acupuncture is effective but similar to sham, both of them have uncertainty regarding treatment effect, or no significant effect. Finally, we reviewed the hypotheses of different scholars on sham acupuncture and analyzed their results.RESULTS: Four types of controlled clinical trials including sham acupuncture on non-Traditional Chinese Medicine acupoints, minimal acupuncture on non-acupoints, placebo needle and sham laser acupuncture had varying results in the 57 articles analyzed. Some showed that acupuncture had a better effect than sham, while some suggest acupuncture and sham had similar effects. In all studies using sham acupuncture on non-therapeutic points, sham electrodes, and sham electro-acupuncture, the therapeutic effect was better than sham. Of the trials, 37 demonstrated that acupuncture had a better effect than sham acupuncture. Only nine trials found no significant difference between acupuncture and sham. Two controlled trials for the same condition (neck pain) conducted by two different German research institutes used the same control method, but reached contradictory conclusions. CONCLUSION: We found problems in conclusions based on results of controlled clinical trials of sham acupuncture in Germany. Therefore, there is still not enough evidence to support the statements that "acupuncture and sham acupuncture have no difference in treatment effect" and "acupuncture is just a placebo effect." The control methods of sham acupuncture used in Germany may not be standardized and may not be suitable for acupuncture clinical trial research. We suggest that research on the methodology of sham acupuncture should be given priority in the design of acupuncture trials in the future.
文摘OBJECTIVE: To investigate the effects of transcutaneous electrical nerve stimulation(TENS) through acupoints on the intraocular pressure(IOP) in patients with glaucoma.METHODS: A single-blinded, randomized experimental design study was conducted. Patients from the North of Taipei Ophthalmology outpatient department diagnosed with intraocular hypertension were selected and were further enrolled if they met the research subject criteria. The patients who met all criteria, and who met no exclusion criteria became the participants. Participants were randomly assigned into the treated group, wherein the TENS electrodes(Qing Ming Medical Device Co., Ltd.,New Taipei City, China) were applied with direct current(DC) on the acupoints Pucan(BL 61) and Shenmai(BL 62) for 20 min. The control group received no TENS electrode treatments. Measurements of IOP were taken four times using a pneumotonometer(Clinico Co., Ltd., New Taipei City, China), before,immediately after, 30 min after, and 60 min after TENS electrode treatments.RESULTS: Eighty-two participants completed the experiment. IOP decreased more in the group treated with DC(P < 0.01) than in the control group. The IOPs were not affected by the age of the patients and their usage of medications.CONCLUSION: TENS of acupoints of Pucan(BL 61)and Shenmai(BL 62) could significantly reduce the IOP in patients with glaucoma.
基金Supported by International Science&Technology Cooperation Program of China(No.2011DFA32750)
文摘OBJECTIVE: To assess the efficacy and safety of Chinese patent medicine(CPM) with the principle of tonifying Qi, promoting blood circulation by removing blood stasis, and resolving phlegm(TQ-PBC-RP)in the management of stable chronic obstructive pulmonary disease(COPD).METHODS: A systematic review of randomized controlled trials(RCTs) identified from electronic databases and print was conducted. RCTs testing CPMs with TQ-PBC-RP against any type of controlled intervention in patients with stable COPD and assessing clinically relevant outcomes were included. Methodological quality was evaluated with the risk of bias tool according to systematic review handbook 5.0.2. Quality of evidence was estimatedby the rating approach developed by the Grading of Recommendations, Assessment, Development,and Evaluation Working Group.RESULTS: Thirteen eligible RCTs with 12 oral CPMs were tested. Significant differences between groups in favor of CPMs were not reported in all trials. Most trials included were deemed to be of low methodological quality with poor evidence quality.Because of large data heterogeneity, statistical pooling was not performed for all outcomes.CONCLUSION: The effectiveness of CPM in the treatment of stable COPD is not supported by evidence. Currently, evidence from RCTs is scarce and methodologically weak. Considering the popularity of CPMs among patients undergoing COPD, rigorously designed trials are warranted.