中国西南边疆的社会经济, 1250-1850

《雲南大學·中國邊疆研究叢書·中國西南邊疆的社會經濟：1250-1850》是李中清在其博士學位論文的基礎修改完善而成、重敘述1368年至1850年間中國西南邊疆的政治與經濟概況。李在邊疆地區的社會經濟與社會生活等方面取得了較高的學術成就，受到學術界的高度重視。在研究的方法上，除繼續重視史誌等傳統史料外，李中清特別關注檔案資料、田野調查、族譜、碑刻、口傳資料等“非規範性文獻資料”的蒐集和利用，注意引入社會學、人口統計學等學科的理論與方法，對相關歷史與社會問題進行量化分析研究，有效地推動了研究方法的進步與革新。由於他對相關研究的廣泛而深入的了解、認識和借鑒，使這份以中國西南邊疆為對象的研究體現出了較為廣闊的國際學術視野，並能立足學術前沿，開展創新性的探索與研究

清代中国西南的粮食生产

清代后期, 中国西南的耕地可能达到了四千万亩, 而非史志所载的一千二百万亩. 新垦耕地多处边缘地区和山区. 尽管旱地仍占主导, 但梯田的发展, 粪肥的使用, 轮种技术的推广还是使西南的土地利用有了较大进步. 稻米, 荞麦等传统粮食作物的种植有较大发展, 玉米, 马铃薯, 花生, 油菜等外地作物传入, 对西南粮食生产和各族生活产生了重大影响. 清代西南边缘地区取代了中心区, 成为主要的粮食生产和输出区. By the late Qing the extent of cultivated land of Southwest China should reached 40 million mu (acreage), rather than 12 million mu which was usually registered by authorities of Southwest China. The vast majority of newly cultivated fields were in the periphery and mountain areas. Although the dry field was still the main kind of cultivated lands, land use was improved significantly, with the expansion of terraces, the use of primitive natural fertilizers, and the increase of crop rotation. In this period, the traditional plants, such as rice , buckwheat etc, were still the important crops, but the maize, potatoes, peanuts and rapeseeds which arrived in the Southwest from America and Chinese interior before the Qing, impacted greatly on the production of foods, the lives of ethnic minorities. Finally the periphery areas, replaced the interior part of Southwest China, became the main region of food production and output

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^