一种果糖脱水制备5-羟甲基糠醛的方法

一种果糖脱水制备5-羟甲基糠醛（HMF）的新方法，该方法以二氧化硅基疏水性纳米固体酸材料作为催化剂，应用于果糖脱水制备HMF过程。由于该材料具有表面疏水性和酸性位，有利于促进反应的高效进行，获得高的果糖转化率和HMF选择性

一种二氧化硅负载贵金属纳米颗粒的制备方法

一种二氧化硅负载金属纳米颗粒的制备方法，该方法采用反相微乳液方法，二氧化硅的制备与金属纳米颗粒的负载一步实现。载体为二氧化硅纳米颗粒，粒径在20～200nm，金属为Cu、Ag、Au、Ni、Pt、Pd、Rh、Ir、Ru，金属纳米颗粒，粒径为1～20nm，金属分散在二氧化硅纳米颗粒上

2,5 -二羟甲基呋喃制备2,5-二甲胺基呋喃的方法

一种催化还原胺化2,5-二羟甲基呋喃制备2,5-二甲胺基呋喃的方法，该方法以氨气为胺源，以原位产生的活性氢为氢源，以负载金属为催化剂，在30-220℃，将2,5-二羟甲基呋喃选择还原胺化为2,5-二甲胺基呋喃。该方法反应条件温和，产品收率高，催化剂易分离、循环使用，而且产物易于分离和提纯，产物纯度达到99%以上。具有很好的应用前景

一种伯醇氧化制备酯的方法

本发明涉及到一种伯醇氧化制备酯的方法。该方法以空气或氧气中的一种或二种为氧源，在疏水型载体负载金属纳米粒子催化作用下，醇被氧化为酯。本发明氧化效率高，产品收率高；以空气或氧气作为氧源，经济、环保；产物和催化剂已分离，后处理简单；催化剂易于重复使用，具有很好的应用前景

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^