Discovery of materials using“bottom-up”or“top-down”approach is of great interest in materials science.Layered materials consisting of two-dimensional(2D)building blocks provide a good platform to explore new mater...Discovery of materials using“bottom-up”or“top-down”approach is of great interest in materials science.Layered materials consisting of two-dimensional(2D)building blocks provide a good platform to explore new materials in this respect.In van der Waals(vdW)layered materials,these building blocks are charge neutral and can be isolated from their bulk phase(top-down),but usually grow on substrate.In ionic layered materials,they are charged and usually cannot exist independently but can serve as motifs to construct new materials(bottom-up).In this paper,we introduce our recently constructed databases for 2D material-substrate interface(2DMSI),and 2D charged building blocks.For 2DMSI database,we systematically build a workflow to predict appropriate substrates and their geometries at substrates,and construct the 2DMSI database.For the 2D charged building block database,1208 entries from bulk material database are identified.Information of crystal structure,valence state,source,dimension and so on is provided for each entry with a json format.We also show its application in designing and searching for new functional layered materials.The 2DMSI database,building block database,and designed layered materials are available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00113.00188.展开更多
<b><span style="font-family:Verdana;">Introduction:</span></b><span style="font-family:Verdana;"> Preventable maternal and newborn mortalities still occur in local com...<b><span style="font-family:Verdana;">Introduction:</span></b><span style="font-family:Verdana;"> Preventable maternal and newborn mortalities still occur in local communities in Kenya since access to maternal and newborn healthcare services remains a big challenge. Barriers to access in resource-constrained settings have not been examined adequately in literature. The World Health Organization (WHO) has 6 building blocks for strengthening healthcare systems that informed this study. This paper examines how user-side and institutional factors influence access and use of Maternal and Newborn Healthcare (MNH) Services in Matayos sub-County-Busia County. <b></b></span><b><b><span style="font-family:Verdana;">Methods:</span></b><span style="font-family:Verdana;"></span></b><b> </b><span style="font-family:Verdana;">A mixed method approach, with an ethnographic inquiry and a descriptive cross-sectional design, was adopted to assess access to MNH services in Matayos-Busia County, Western Kenya. Postpartum women who had delivered within the previous 12 months and health care providers in the study area were recruited as respondents. A total of 348 postpartum women were selected through stratified systematic random sampling for the survey. Purposive sampling was used to select postpartum women, conventional and traditional health care providers for 16 in-depth interviews and 7 focus group discussions. Data were analyzed using descriptive and inferential statistics. Qualitative data analysis was done thematically. <b></b></span><b><b><span style="font-family:Verdana;">Results</span><span style="font-family:Verdana;">:</span></b><span style="font-family:Verdana;"></span></b><span style="font-family:Verdana;"> Institutional delivery was low at 68% and family planning at 75% although demand for services was high at 99%. User-side barriers to access included shared beliefs and practices in the community;high direct transport costs from home;and high costs for missing drugs and other supplies in hospitals. Middle (5</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">-7</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">) order deliveries occurred at home with traditional birth attendants. The choice of place of delivery in households was influenced by spouses to respondents and communities of residence where respondents lived or were married. All 6 WHO health system building blocks were weak in Matayos sub-County and needed system-wide strengthening involving all pillars. The user-community voice alone was insufficient and the 7</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;"> pillar for user-community engagement was absent. The underlying factors were weak governance and underfunding for healthcare.</span> <b><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"></span></b><b> </b><span style="font-family:Verdana;">The six WHO building blocks were inadequate due to weak governance and inadequate funding. User-community engagement, the 7<sup>th</sup> Pillar, was absent in these resource-limited settings. We recommend user-community empowerment, engagement and participation, adoption of a system thinking approach and adequate funding.</span>展开更多
The selection of an optimized restoration building block(RBB)scheme among all available schemes is one of the most important factors impacting the power system restoration process after a complete or partial blackout....The selection of an optimized restoration building block(RBB)scheme among all available schemes is one of the most important factors impacting the power system restoration process after a complete or partial blackout.This paper presents a data envelopment analysis(DEA)model used as an empirical method to assess the RBB schemes.An N-level evaluation scale cloud system is built based on cloud theory to transform qualitative I/O indices of DEA model into quantitative values.Through joint utilization of the CCR(Charnes,Cooper and Rhodes)model and the LJK(Li,Jahanshahloo and Khodabakhshi)model,the established Joint-DEA model makes the newly proposed Cloud-DEA method a more feasible and robust method in assessment of RBB schemes.展开更多
This paper reports the physical realization of the Bipolar Field-Effect Transistor （BiFET） and its onetransistor basic building block circuits. Examples are given for the one and two MOS gates on thin and thick, pur...This paper reports the physical realization of the Bipolar Field-Effect Transistor （BiFET） and its onetransistor basic building block circuits. Examples are given for the one and two MOS gates on thin and thick, pure and impure base, with electron and hole contacts, and the corresponding theoretical current-voltage characteristics previously computed by us, without generation-recombination-trapping-tunneling of electrons and holes. These examples include the one-MOS-gate on semi-infinite thick impure base transistor （the bulk transistor） and the impurethin-base Silicon-on-Insulator （SOI） transistor and the two-MOS-gates on thin base transistors （the FinFET and the Thin Film Transistor TFF）. Figures are given with the cross-section views containing the electron and hole concentration and current density distributions and trajectories and the corresponding DC current-voltage characteristics.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61888102,52272172,and 52102193)the Major Program of the National Natural Science Foundation of China(Grant No.92163206)+2 种基金the National Key Research and Development Program of China(Grant Nos.2021YFA1201501 and 2022YFA1204100)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB30000000)the Fundamental Research Funds for the Central Universities.
文摘Discovery of materials using“bottom-up”or“top-down”approach is of great interest in materials science.Layered materials consisting of two-dimensional(2D)building blocks provide a good platform to explore new materials in this respect.In van der Waals(vdW)layered materials,these building blocks are charge neutral and can be isolated from their bulk phase(top-down),but usually grow on substrate.In ionic layered materials,they are charged and usually cannot exist independently but can serve as motifs to construct new materials(bottom-up).In this paper,we introduce our recently constructed databases for 2D material-substrate interface(2DMSI),and 2D charged building blocks.For 2DMSI database,we systematically build a workflow to predict appropriate substrates and their geometries at substrates,and construct the 2DMSI database.For the 2D charged building block database,1208 entries from bulk material database are identified.Information of crystal structure,valence state,source,dimension and so on is provided for each entry with a json format.We also show its application in designing and searching for new functional layered materials.The 2DMSI database,building block database,and designed layered materials are available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00113.00188.
文摘<b><span style="font-family:Verdana;">Introduction:</span></b><span style="font-family:Verdana;"> Preventable maternal and newborn mortalities still occur in local communities in Kenya since access to maternal and newborn healthcare services remains a big challenge. Barriers to access in resource-constrained settings have not been examined adequately in literature. The World Health Organization (WHO) has 6 building blocks for strengthening healthcare systems that informed this study. This paper examines how user-side and institutional factors influence access and use of Maternal and Newborn Healthcare (MNH) Services in Matayos sub-County-Busia County. <b></b></span><b><b><span style="font-family:Verdana;">Methods:</span></b><span style="font-family:Verdana;"></span></b><b> </b><span style="font-family:Verdana;">A mixed method approach, with an ethnographic inquiry and a descriptive cross-sectional design, was adopted to assess access to MNH services in Matayos-Busia County, Western Kenya. Postpartum women who had delivered within the previous 12 months and health care providers in the study area were recruited as respondents. A total of 348 postpartum women were selected through stratified systematic random sampling for the survey. Purposive sampling was used to select postpartum women, conventional and traditional health care providers for 16 in-depth interviews and 7 focus group discussions. Data were analyzed using descriptive and inferential statistics. Qualitative data analysis was done thematically. <b></b></span><b><b><span style="font-family:Verdana;">Results</span><span style="font-family:Verdana;">:</span></b><span style="font-family:Verdana;"></span></b><span style="font-family:Verdana;"> Institutional delivery was low at 68% and family planning at 75% although demand for services was high at 99%. User-side barriers to access included shared beliefs and practices in the community;high direct transport costs from home;and high costs for missing drugs and other supplies in hospitals. Middle (5</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">-7</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">) order deliveries occurred at home with traditional birth attendants. The choice of place of delivery in households was influenced by spouses to respondents and communities of residence where respondents lived or were married. All 6 WHO health system building blocks were weak in Matayos sub-County and needed system-wide strengthening involving all pillars. The user-community voice alone was insufficient and the 7</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;"> pillar for user-community engagement was absent. The underlying factors were weak governance and underfunding for healthcare.</span> <b><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"></span></b><b> </b><span style="font-family:Verdana;">The six WHO building blocks were inadequate due to weak governance and inadequate funding. User-community engagement, the 7<sup>th</sup> Pillar, was absent in these resource-limited settings. We recommend user-community empowerment, engagement and participation, adoption of a system thinking approach and adequate funding.</span>
基金supported by the National Natural Science Foundation of China under Grant 51377103the Participation in Research Program for undergraduate students of Shanghai Jiao Tong University under Grant T030PRP26041.
文摘The selection of an optimized restoration building block(RBB)scheme among all available schemes is one of the most important factors impacting the power system restoration process after a complete or partial blackout.This paper presents a data envelopment analysis(DEA)model used as an empirical method to assess the RBB schemes.An N-level evaluation scale cloud system is built based on cloud theory to transform qualitative I/O indices of DEA model into quantitative values.Through joint utilization of the CCR(Charnes,Cooper and Rhodes)model and the LJK(Li,Jahanshahloo and Khodabakhshi)model,the established Joint-DEA model makes the newly proposed Cloud-DEA method a more feasible and robust method in assessment of RBB schemes.
基金This investigation and Jie Binbin have been supported by the CTSAH Associates (CTSA)founded by the late Linda Su-Nan Chang Sah,in memory of her 70th year.
文摘This paper reports the physical realization of the Bipolar Field-Effect Transistor （BiFET） and its onetransistor basic building block circuits. Examples are given for the one and two MOS gates on thin and thick, pure and impure base, with electron and hole contacts, and the corresponding theoretical current-voltage characteristics previously computed by us, without generation-recombination-trapping-tunneling of electrons and holes. These examples include the one-MOS-gate on semi-infinite thick impure base transistor （the bulk transistor） and the impurethin-base Silicon-on-Insulator （SOI） transistor and the two-MOS-gates on thin base transistors （the FinFET and the Thin Film Transistor TFF）. Figures are given with the cross-section views containing the electron and hole concentration and current density distributions and trajectories and the corresponding DC current-voltage characteristics.
