Since its founding in April 1983, the China National Non-ferrous Metal Industrial Corporation has developed into a giant enterprise group engaged in the production of non-ferrous metal mineral products, smelting produ...Since its founding in April 1983, the China National Non-ferrous Metal Industrial Corporation has developed into a giant enterprise group engaged in the production of non-ferrous metal mineral products, smelting products, processing products and recovery products, as well as geological prospecting, engineering survey, design, construction, equipment manufacture, the research and development of hi-tech prod-展开更多
Objective:Heterogeneity of participants in clinical trials distorts intervention efficacy.However,factors associated with participant heterogeneity in randomized clinical trials(RCTs)focusing on systemic sclerosis(SSc...Objective:Heterogeneity of participants in clinical trials distorts intervention efficacy.However,factors associated with participant heterogeneity in randomized clinical trials(RCTs)focusing on systemic sclerosis(SSc)are not clear.We conducted this systematic review to establish normative standards for future research and help develop management guidelines.Methods:Three databases and 4 registries were searched to identify characteristics of SSc RCTs across different countries.Risk of bias was assessed by the Cochrane Collaboration’s tool and logistic regression was performed to calculate crude and adjusted odds ratios.Results:In total,261 trials met our inclusion criteria.The quality of SSc RCTs worldwide was relatively poor,with no trend of improvement in recent years,and only 12.2%were ranked as having a low risk of bias.Trials with a low risk of bias as well as single-center,single-country,or open-label trials tended to have better participant adherence than trials with a high risk of bias and multiple-center,multiple-country,or double-blind trials.Interestingly,trial registration and primary outcome definition contributed to high withdrawal.National income was also relevant;participant adherence in high-income countries,but not in upper-and lower-middle-income countries,was significantly altered by different variables.Conclusion:Overall,the risk of bias,national income,and trial design may lead to participant heterogeneity of SSc RCTs and ultimately confound the general clinical utility of the results.Trials with a rigorous design and transparent conduction protocol are crucial for obtaining unbiased data that can serve as a reference and for maintaining the fundamental repeatability of SSc RCTs.展开更多
Non-alcoholic fatty liver disease(NAFLD)is a heterogeneous condition with a wide spectrum of clinical presentations and natural history and disease severity.There is also substantial inter-individual variation and var...Non-alcoholic fatty liver disease(NAFLD)is a heterogeneous condition with a wide spectrum of clinical presentations and natural history and disease severity.There is also substantial inter-individual variation and variable response to a different therapy.This heterogeneity of NAFLD is in turn influenced by various factors primarily demographic/dietary factors,metabolic status,gut microbiome,genetic predisposition together with epigenetic factors.The differential impact of these factors over a variable period of time influences the clinical phenotype and natural history.Failure to address heterogeneity partly explains the sub-optimal response to current and emerging therapies for fatty liver disease.Consequently,leading experts across the globe have recently suggested a change in nomenclature of NAFLD to metabolic-associated fatty liver disease(MAFLD)which can better reflect current knowledge of heterogeneity and does not exclude concomitant factors for fatty liver disease(e.g.alcohol,viral hepatitis,etc.).Precise identification of disease phenotypes is likely to facilitate clinical trial recruitment and expedite translational research for the development of novel and effective therapies for NAFLD/MAFLD.展开更多
Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this area.In th...Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this area.In the case that free gas exists beneath hydrate deposits,the frequency of the hydrate deposits will be noticeably attenuated,with the attenuation degree mainly affected by pore development and free gas content.Therefore,the frequency can be used as an important attribute to identify hydrate reservoirs.Based on the time-frequency characteristics of deposits,this study predicted the spatial distribution of hydrates in this area using the frequency division inversion method as follows.Firstly,the support vector machine(SVM)method was employed to study the amplitude versus frequency(AVF)response based on seismic and well logging data.Afterward,the AVF response was introduced as independent information to establish the nonlinear relationship between logging data and seismic waveform.Then,the full frequency band information of the seismic data was fully utilized to obtain the results of frequency division inversion.The inversion results can effectively broaden the frequency band,reflect the NGHs distribution,and reveal the NGHs reservoirs of two types,namely the fluid migration pathway type and the in situ self-generation self-storage diffusion type.Moreover,the inversion results well coincide with the drilling results.Therefore,it is feasible to use the frequency division inversion to predict the spatial distribution of heterogeneous NGHs reservoirs,which facilitates the optimization of favorable drilling targets and is crucial to the resource potential assessment of NGHs.展开更多
文摘Since its founding in April 1983, the China National Non-ferrous Metal Industrial Corporation has developed into a giant enterprise group engaged in the production of non-ferrous metal mineral products, smelting products, processing products and recovery products, as well as geological prospecting, engineering survey, design, construction, equipment manufacture, the research and development of hi-tech prod-
基金funding received from the Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences(No.2020-RC320-003)the National Natural Science Foundation of China(No.81830097)
文摘Objective:Heterogeneity of participants in clinical trials distorts intervention efficacy.However,factors associated with participant heterogeneity in randomized clinical trials(RCTs)focusing on systemic sclerosis(SSc)are not clear.We conducted this systematic review to establish normative standards for future research and help develop management guidelines.Methods:Three databases and 4 registries were searched to identify characteristics of SSc RCTs across different countries.Risk of bias was assessed by the Cochrane Collaboration’s tool and logistic regression was performed to calculate crude and adjusted odds ratios.Results:In total,261 trials met our inclusion criteria.The quality of SSc RCTs worldwide was relatively poor,with no trend of improvement in recent years,and only 12.2%were ranked as having a low risk of bias.Trials with a low risk of bias as well as single-center,single-country,or open-label trials tended to have better participant adherence than trials with a high risk of bias and multiple-center,multiple-country,or double-blind trials.Interestingly,trial registration and primary outcome definition contributed to high withdrawal.National income was also relevant;participant adherence in high-income countries,but not in upper-and lower-middle-income countries,was significantly altered by different variables.Conclusion:Overall,the risk of bias,national income,and trial design may lead to participant heterogeneity of SSc RCTs and ultimately confound the general clinical utility of the results.Trials with a rigorous design and transparent conduction protocol are crucial for obtaining unbiased data that can serve as a reference and for maintaining the fundamental repeatability of SSc RCTs.
文摘Non-alcoholic fatty liver disease(NAFLD)is a heterogeneous condition with a wide spectrum of clinical presentations and natural history and disease severity.There is also substantial inter-individual variation and variable response to a different therapy.This heterogeneity of NAFLD is in turn influenced by various factors primarily demographic/dietary factors,metabolic status,gut microbiome,genetic predisposition together with epigenetic factors.The differential impact of these factors over a variable period of time influences the clinical phenotype and natural history.Failure to address heterogeneity partly explains the sub-optimal response to current and emerging therapies for fatty liver disease.Consequently,leading experts across the globe have recently suggested a change in nomenclature of NAFLD to metabolic-associated fatty liver disease(MAFLD)which can better reflect current knowledge of heterogeneity and does not exclude concomitant factors for fatty liver disease(e.g.alcohol,viral hepatitis,etc.).Precise identification of disease phenotypes is likely to facilitate clinical trial recruitment and expedite translational research for the development of novel and effective therapies for NAFLD/MAFLD.
基金supported by the National Research and Development Fund entitled“High Precision Characterization Technology of Natural Gas Hydrates Reservoirs”(2017YFC0307406)the projects entitled“Integrated Observation Data Integration and Application Service of Natural Resource Elements”(DD20208067)+2 种基金“Comprehensive geological survey of coastal zone and reef in the Northern Jiaodong”(ZD20220604)initiated by the China Geological Surveythe project entitled“Study on Hydrocarbon Accumulation Failure and Fluid Evolution Reduction of the Permian Reservoir in the Laoshan Uplift,South Yellow Sea”(42076220)“Temporal and Spatial Distribution Characteristics and Provenance of Two Stages Paleo-deltas on the Outer Shelf in the North of the East China Sea since Late Pleistocene”(41706069)organized by the National Natural Science Foundation of China。
文摘Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this area.In the case that free gas exists beneath hydrate deposits,the frequency of the hydrate deposits will be noticeably attenuated,with the attenuation degree mainly affected by pore development and free gas content.Therefore,the frequency can be used as an important attribute to identify hydrate reservoirs.Based on the time-frequency characteristics of deposits,this study predicted the spatial distribution of hydrates in this area using the frequency division inversion method as follows.Firstly,the support vector machine(SVM)method was employed to study the amplitude versus frequency(AVF)response based on seismic and well logging data.Afterward,the AVF response was introduced as independent information to establish the nonlinear relationship between logging data and seismic waveform.Then,the full frequency band information of the seismic data was fully utilized to obtain the results of frequency division inversion.The inversion results can effectively broaden the frequency band,reflect the NGHs distribution,and reveal the NGHs reservoirs of two types,namely the fluid migration pathway type and the in situ self-generation self-storage diffusion type.Moreover,the inversion results well coincide with the drilling results.Therefore,it is feasible to use the frequency division inversion to predict the spatial distribution of heterogeneous NGHs reservoirs,which facilitates the optimization of favorable drilling targets and is crucial to the resource potential assessment of NGHs.
