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8,760 result(s) for "Jian, Cao"
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دراسات حول الفضاء العالمي و\الحزام والطريق\ : (مجلد الموانئ البحرية)
ينقسم الكتاب إلى خمسة فصول، يقدم الفصل الأول نظام الموانئ العالمي والعلاقات بين المدن الساحلية والتعاون في مجال الموانئ، ويناقش الفصل الثاني الخدمات اللوجستية البحرية العالمية وتطوير لوجستيات الموانئ الرئيسية، ويتناول الفصل الثالث نظام الموانئ في الصين وخصائصه. الاستجابة العالمية: يحلل الفصل الرابع بشكل رئيسي مؤشر البلطيق، وهو مؤشر تقييم مراكز الشحن الدولية، ويناقش الفصل الخامس نمط الموانئ العالمية وتغيرات النظام وتطور النقل البحري بناءً على منظور عالمي.
Subsidence prediction of overburden strata and ground surface in shallow coal seam mining
Shallow coal seam with thick soil layer is widely reserved in the Jurassic Coalfield, Western China, mining-induced subsidence represents complex characteristics. Combining with physical simulation, theoretical analysis and in-situ observation, the overburden strata structure in dip direction were revealed, and the subsidence prediction models were established, based on this, the subsidence equations of overburden strata and ground surface were proposed. The results show that after shallow coal seam mining, based on the subsidence and movement characteristics, the overburden strata structure can be divided into three zones, which are \"boundary pillar F-shape zone\" (BPZ), \"trapezoid goaf zone\" (TGZ) and \"coal pillar inverted trapezoidal zone\" (CPZ). The subsidence of overburden strata depends on the key stratum, while the subsidence of soil layer depends on the bedrock subsidence basin, which is between the bedrock and thick soil layer. The bedrock subsidence is mainly related to mining height and bulking coefficient in TGZ, while it is mainly affected by mining height and distribution load on the key stratum in BPZ and CPZ. According to physical simulation and theoretical model, the maximum surface subsidence of No.1-2 seam mining in Ningtiaota coal mine are 1.1 m and 1.07 m respectively, which is basically consistence with the result of in-situ observation (1.2 m).
دراسات حول الفضاء العالمي و\الحزام والطريق\ : (مجلد الثقافة)
ينطلق هذا المجلد من العلاقة الهيكلية بين \"الفضاء\" و\"الثقافة\"، ويجمع بين مفهوم \"الفضاء\" في الجغرافيا ومفهوم \"السياق\" في الدراسات الثقافية وغيرهم من المفاهيم الأخرى، ويشرح نماذج ودلالات وأهداف مبادرة \"الحزام والطريق\" في سياق الحضارة الحديثة، ويصف صورة امتداد الحضارة على المحور التاريخي لـ \"الحزام والطريق\"، ويحلل الدلالة الثقافية في كل من اتجاه القيمة وبناء القوة الناعمة وإنشاء السياق الشرقي الخاصين بمبادرة \"الحزام والطريق\"، ويفسر علاقة الارتباط بين الثقافة الوطنية لـ \"الحزام والطريق\" والفضاء الوطني، ويكشف عن السرد عبر الفضاء للرموز الثقافية لـ \"الحزام والطريق\" ويوضح التعبير الرقمي والمرئي لواقع \"الحزام والطريق\"
Hemisphere-asymmetric tropical cyclones response to anthropogenic aerosol forcing
How anthropogenic forcing could change tropical cyclones (TCs) is a keen societal concern owing to its significant socio-economic impacts. However, a global picture of the anthropogenic aerosol effect on TCs has not yet emerged. Here we show that anthropogenic aerosol emission can reduce northern hemisphere (NH) TCs but increase southern hemisphere (SH) TCs primarily through altering vertical wind shear and mid-tropospheric upward motion in the TC formation zones. These circulation changes are driven by anthropogenic aerosol-induced NH-cooler-than-SH and NH-increased versus SH-decreased meridional (equator to mid-latitudes) temperature gradients. The cooler NH produces a low-level southward cross-equatorial transport of moist static energy, weakening the NH ascent in the TC formation zones; meanwhile, the increased meridional temperature gradients strengthen vertical wind shear, reducing NH TC genesis. The opposite is true for the SH. The results may help to constrain the models’ uncertainty in the future TC projection. Reduction of anthropogenic aerosol emission may increase the NH TCs threat. The impact of anthropogenic emissions on climate dynamics is important in our changing climate. Here, the authors show that anthropogenic aerosol emissions can reduce northern hemisphere tropical cyclones but will increase in the southern hemisphere primarily through altering vertical wind shear and upward motion in the tropical cyclone formation zones.
دراسات حول الفضاء العالمي و\الحزام والطريق\ : (مجلد السياحة)
إن استراتيجية \"الحزام والطريق\" هي عملية طويلة الأمد، ولا يمكن وصف دورها في تعزيز تنمية السياحة ببساطة. يحلل \"الفضاء العالمي و\"حزام واحد وطريق واحد\" حجم السياحة\" الوضع الحالي لتنمية السياحة العالمية في سياق استراتيجية \"حزام واحد وطريق واحد\"، ويقدم بالتفصيل تطور السياحة العالمية والخلفية السياحية. \"حزام وطريق\"، بما في ذلك نظرة عامة على صناعة السياحة العالمية، والاتجاهات الجديدة في تنمية السياحة العالمية ونمط السياحة العالمية، وما إلى ذلك، واستنادا إلى تحليل فرص وتحديات تنمية السياحة العالمية والصينية، والتأثير الترويجي لـ \"حزام واحد وطريق واحد\"، وتم تفسير استراتيجية \"الحزام والطريق\" لتنمية السياحة.
One-step ethylene production from a four-component gas mixture by a single physisorbent
One-step adsorptive purification of ethylene (C 2 H 4 ) from four-component gas mixtures comprising acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ) and carbon dioxide (CO 2 ) is an unmet challenge in the area of commodity purification. Herein, we report that the ultramicroporous sorbent Zn-atz-oba (H 2 oba = 4,4-dicarboxyl diphenyl ether; Hatz = 3-amino-1,2,4-triazole) enables selective adsorption of C 2 H 2 , C 2 H 6 and CO 2 over C 2 H 4 thanks to the binding sites that lie in its undulating pores. Molecular simulations provide insight into the binding sites in Zn-atz-oba that are responsible for coadsorption of C 2 H 2 , C 2 H 6 and CO 2 over C 2 H 4 . Dynamic breakthrough experiments demonstrate that the selective binding exhibited by Zn-atz-oba can produce polymer-grade purity (>99.95%) C 2 H 4 from binary (1:1 for C 2 H 4 /C 2 H 6 ), ternary (1:1:1 for C 2 H 2 /C 2 H 4 /C 2 H 6 ) and quaternary (1:1:1:1 for C 2 H 2 /C 2 H 4 /C 2 H 6 /CO 2 ) gas mixtures in a single step. The purification of ethylene is an industrially relevant process. Here, the authors report the one-step separation of ethylene from quaternary gas mixtures of hydrocarbons and CO 2 using a single metal–organic framework-based physisorbent.
دراسات حول الفضاء العالمي و\الحزام والطريق\ : (مجلد البيئة الإيكولوجية)
إن معظم الدول والمناطق على طول «الحزام والطريق» هي دول نامية، وتعاني جميعا من مشكلات في البيئة الإيكولوجية أكثر أو أقل، كما إنها تواجه تحديات ضخمة في التوازن بين التنمية وحماية البيئة. وتواجه هذه البلدان النامية فرصا غير مسبوقة أتاحها المفهوم الاستراتيجي لمبادرة «الحزام والطريق»، كما أن كيفية التعامل مع التحدي المتمثل في حماية البيئة الإيكولوجية أثناء بناء وتطوير «الحزام والطريق» هي المهمة الأساسية التي تواجهها البلدان النامية بما فيها الصين. ويناقش هذا الكتاب ويلخص الخلفية البيئية الإيكولوجية للبلدان/ المناطق المشاركة في مبادرة \"الحزام والطريق\" والمشكلات الرئيسية في هذا الجانب.
Immune suppressive landscape in the human esophageal squamous cell carcinoma microenvironment
Cancer immunotherapy has revolutionized cancer treatment, and it relies heavily on the comprehensive understanding of the immune landscape of the tumor microenvironment (TME). Here, we obtain a detailed immune cell atlas of esophageal squamous cell carcinoma (ESCC) at single-cell resolution. Exhausted T and NK cells, regulatory T cells (Tregs), alternatively activated macrophages and tolerogenic dendritic cells are dominant in the TME. Transcriptional profiling coupled with T cell receptor (TCR) sequencing reveal lineage connections in T cell populations. CD8 T cells show continuous progression from pre-exhausted to exhausted T cells. While exhausted CD4, CD8 T and NK cells are major proliferative cell components in the TME, the crosstalk between macrophages and Tregs contributes to potential immunosuppression in the TME. Our results indicate several immunosuppressive mechanisms that may be simultaneously responsible for the failure of immuno-surveillance. Specific targeting of these immunosuppressive pathways may reactivate anti-tumor immune responses in ESCC. Understanding the tumour microenvironment is essential for the efficacy of immunotherapies. Here the authors describe the immune landscape in esophageal squamous cell carcinoma and suggest several immunosuppressive mechanisms, which upon targeting may restore anti-tumour immune response.
Mineral Resource Management 2023: Assessment, Mining and Processing
Mineral resources provide basic materials for the development of human society [...]
C–C bond activation enabled by dyotropic rearrangement of Pd(iv) species
The weak carbon–metal bond combined with the kinetic inertness of the carbon–carbon bond renders metal-catalysed C–C bond activation to be highly challenging. Most of the reported C–C bond activation methodologies involve strain-releasing cleavage of small rings to compensate for unfavourable kinetic and thermodynamic penalties associated with C–C bond cleavage. Here we report that the 1,2-positional interchange of vicinal C–C and C–Pd(iv) bonds (dyotropic rearrangement) can be realized in a stereospecific manner under mild conditions, giving access to quaternary carbon–palladium bonds. An enantioselective synthesis of medicinally relevant fluorinated cyclopentanes, featuring this rearrangement as a key step, has been developed. We anticipate that implementing a Pd-based dyotropic rearrangement in reaction design could provide a new tool in the development of Pd-catalysed transformations.Many C–C bond activation methods involve strain-releasing cleavage of small rings to compensate for unfavourable kinetics and thermodynamics. Now, the 1,2-positional interchange of vicinal C–C and C–Pd bonds has been reported, giving access to quaternary carbon–palladium bonds. This dyotropic rearrangement has been used for the enantioselective synthesis of functionalized fluorinated cyclopentanes.