Synthesis of acetic acid by direct oxidation of ethylene on Pd-H4SiW12O40-based catalysts was studied in a fixed-bed integral reactor and a pulse differential reactor. From the performance of the catalysts with differ...Synthesis of acetic acid by direct oxidation of ethylene on Pd-H4SiW12O40-based catalysts was studied in a fixed-bed integral reactor and a pulse differential reactor. From the performance of the catalysts with different compositions and configurations, it is proposed that acetic acid is predominantly produced via an intermediate of acetaldehyde. This can be easily confirmed by comparing the product distributions in the integral and the differential reactors. The active sites for acetic acid formation are considered to exist mainly at the boundaries between the H4SiW12O40 and the Pd particles. The Pd-based catalysts reduced by H2/N2 have higher activities than those reduced by hydrazine, as explained by the degree of Pd dispersion obtained from the characteristics of hydrogen chemical adsorption. It was found that the Pd-Se-SiW12/SiO2 catalyst with selenium tetrachloride as a precursor was more active than that with potassium selenite, and that the acetic acid yield can be greatly increased by adding a suitable amount of dichloroethane (C2H4C12/C2H4 mole ratio=0.03) to the reactants.展开更多
Pancreatic cancer (PC) combined with situs inversus totalis (SIT) is rare, and the treatment strategy is obscure. We report the first patient with PC and SIT who underwent robot-assisted pancreaticoduodenectomy. A 57-...Pancreatic cancer (PC) combined with situs inversus totalis (SIT) is rare, and the treatment strategy is obscure. We report the first patient with PC and SIT who underwent robot-assisted pancreaticoduodenectomy. A 57-year-old male patient presented to our hospital with epigastric pain, nausea, and weight loss over 1 month. Preoperative diagnostic modalities revealed a resectable pancreatic ductal adenocarcinoma at the head and neck junction of the pancreas. The patient also had a rare condition called SIT. Then, the patient underwent Da Vinci robot-assisted pancreaticoduodenectomy (RPD) in our center. After the operation, the patient recovered well without complications. Until now, the patient was followed up 5 months, and the quality of life was well without tumor recurrence or metastasis. To the authors’ knowledge, this is the first RPD for PC in SIT patients.展开更多
This paper deals with the optimal transportation for generalized Lagrangian L = L（x, u, t）, and considers the following cost function： c（x, y） = inf x（0）=x x（1）=y u∈U∫0^1 L（x（s）, u（x（s）, s）, s）ds, w...This paper deals with the optimal transportation for generalized Lagrangian L = L（x, u, t）, and considers the following cost function： c（x, y） = inf x（0）=x x（1）=y u∈U∫0^1 L（x（s）, u（x（s）, s）, s）ds, where U is a control set, and x satisfies the ordinary equation x（s） = f（x（s）, u（x（s）, s））.It is proved that under the condition that the initial measure μ0 is absolutely continuous w.r.t. the Lebesgue measure, the Monge problem has a solution, and the optimal transport map just walks along the characteristic curves of the corresponding Hamilton-Jacobi equation：Vt（t, x） ＋ sup u∈U = 0,V（0, x） = Φ0（x）.展开更多
文摘Synthesis of acetic acid by direct oxidation of ethylene on Pd-H4SiW12O40-based catalysts was studied in a fixed-bed integral reactor and a pulse differential reactor. From the performance of the catalysts with different compositions and configurations, it is proposed that acetic acid is predominantly produced via an intermediate of acetaldehyde. This can be easily confirmed by comparing the product distributions in the integral and the differential reactors. The active sites for acetic acid formation are considered to exist mainly at the boundaries between the H4SiW12O40 and the Pd particles. The Pd-based catalysts reduced by H2/N2 have higher activities than those reduced by hydrazine, as explained by the degree of Pd dispersion obtained from the characteristics of hydrogen chemical adsorption. It was found that the Pd-Se-SiW12/SiO2 catalyst with selenium tetrachloride as a precursor was more active than that with potassium selenite, and that the acetic acid yield can be greatly increased by adding a suitable amount of dichloroethane (C2H4C12/C2H4 mole ratio=0.03) to the reactants.
基金CAMS Innovation Fund for Medical Sciences (CIFMS) (2021-I2M-1-002 & 2022-I2M-C&T-B-030)National High-Level Hospital Clinical Research Funding (2022-PUMCH-D-001 & 2022-PUMCH-B-004)National Multidisciplinary Cooperative Diagnosis and Treatment Capacity Building Project for Major Diseases.
文摘Pancreatic cancer (PC) combined with situs inversus totalis (SIT) is rare, and the treatment strategy is obscure. We report the first patient with PC and SIT who underwent robot-assisted pancreaticoduodenectomy. A 57-year-old male patient presented to our hospital with epigastric pain, nausea, and weight loss over 1 month. Preoperative diagnostic modalities revealed a resectable pancreatic ductal adenocarcinoma at the head and neck junction of the pancreas. The patient also had a rare condition called SIT. Then, the patient underwent Da Vinci robot-assisted pancreaticoduodenectomy (RPD) in our center. After the operation, the patient recovered well without complications. Until now, the patient was followed up 5 months, and the quality of life was well without tumor recurrence or metastasis. To the authors’ knowledge, this is the first RPD for PC in SIT patients.
文摘This paper deals with the optimal transportation for generalized Lagrangian L = L（x, u, t）, and considers the following cost function： c（x, y） = inf x（0）=x x（1）=y u∈U∫0^1 L（x（s）, u（x（s）, s）, s）ds, where U is a control set, and x satisfies the ordinary equation x（s） = f（x（s）, u（x（s）, s））.It is proved that under the condition that the initial measure μ0 is absolutely continuous w.r.t. the Lebesgue measure, the Monge problem has a solution, and the optimal transport map just walks along the characteristic curves of the corresponding Hamilton-Jacobi equation：Vt（t, x） ＋ sup u∈U = 0,V（0, x） = Φ0（x）.
