检索结果-南通市图书馆

Research in Astronomy and Astrophysics 2022年第9期22卷 132-139页

作者： jia-wei hou Shu-Guang Zeng Sheng Zheng Xiao-Yu Luo Lin-Hua Deng Yang-Yang Li Yan-Qing Chen Gang-Hua Lin Yong-Li Feng Jin-Ping Tao Center for Astronomy and Space Sciences China Three Gorges UniversityYichang 443002China College of Science China Three Gorges UniversityYichang 43002China Yunnan Observatories Chinese Academy of SciencesKunming.650216China National Astronomical Observatories Chinese Academy of SciencesKunming650216China

The ratio of penumbral to umbra area of sunspots plays a crucial role in the solar physics fields, especially for understanding the origin and evolution of the solar activity cycle. By analyzing the recently digitized sunspot drawings observed from Yunnan Observatories(1957–2021), we investigate the long-term variation of the penumbral to umbra area ratio of sunspots. An automatic extraction method, based on the maximum between-class variance and the morphological discrimination, is used to accurately extract penumbra and umbra and to calculate the ratio over six solar cycles(cycle 19–24). The expected value of the ratio of penumbra to umbra area is found to be 6.63 ± 0.98, and it does not exhibit any systematic variation with sunspot latitudes and phases. The average ratio fluctuates from 5 to 7.5 per year and the overall trend has decreased after 1999 compared to the previous one.The ratio of sunspot penumbra to umbra area satisfies the log-normal distribution, implying that its variation is related to the evolution of the photospheric magnetic field. Our results are consistent with previous works.

关键词： Sun:sunspots Sun:photosphere Sun:activity techniques:image processing

Theoretical study on the stability of nanobubbles and its verification in molecular dynamics simulation

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第4期87卷 99-105页

作者： Sheng Mi Chaofeng hou wei Ge School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing.100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

The stability of vapor nanobubbles in bulk liquid was investigated theoretically and the critical bubble size was derived from macroscale thermodynamic equations,below which the system destabilizes with sharp drop in pressure.This critical size was quantitatively verified in molecular dynamic simulation using the Lennard-Jones model of argon,where stronger attraction between the molecules at lower density is found to contribute most to the drop of system pressure and,as the Laplace pressure on the curved bubble interface fails to balance the pressure difference across the interface,the bubbles become unstable.The theoretical model could be extended to other systems where reliable equations of state and interfacial tension are available.

关键词： Nanobubble Stability Phase diagram Critical size

The variation of DOM during long distance water transport by the China South to North Water Diversion Scheme and impact on drinking water treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第5期18卷 85-100页

作者： Hankun Yang Yujuan Li Hongyu Liu Nigel J.D.Graham Xue Wu jiawei hou Mengjie Liu Wenyu Wang Wenzheng Yu State Key Laboratory of Environmental Aquatic Chemistry Key Laboratory of Drinking Water Science and TechnologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China School of Environment and Municipal Engineering Qingdao Technological UniversityQingdao266033China Colleges of Forestry Northeast Forestry UniversityHarbin150006China Department of Civil and Environmental Engineering Imperial College LondonSouth Kensington CampusLondonSW7 2AZUK School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Separation Membrane Processes School of Environment Science and EngineeringTiangong UniversityTianjin300387China

In this study,samples were taken from three locations,upstream to downstream,along the central route project of the China South to North Water Diversion(SNWD)scheme in summer and winter.These were used to reveal the variations of dissolved organic matter(DOM)during the water transfer process,and the effects of these variations on drinking water treatment and disinfection by-products formation potential(DBPs-FP).The results showed that polysaccharides accumulate in summer and reduce in winter with flow distance,which has an important effect on the overall properties of DOM,as well as on the performance of coagulation,ultrafiltration,and the formation of DBPs.Humic substances,and their hydrophilic content,also increased in summer and decreased in winter with flow distance.In contrast,the concentration of small organic substances(MW⩽1000 Da)increased in both summer and winter with flow distance,which affected both nanofiltration(NF)membrane fouling and DBPs-FP.The results provide a useful case study of spatial and temporal changes in raw water DOM during long distance water transfer and their impact on the treatment and quality of drinking water from the SNWD.

关键词： Long-distance water transfer The China South to North Water Diversion Scheme Coagulation Membrane filtration Disinfection by-products

The Crystallization Behavior of L-Poly(lactic acid)/Polypropylene Blends:The Acceleration for Both L-Poly(lactic acid)and Polypropylene

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 775-786页

作者： Shuang-Cheng Li wei-jia Zhou Wen-Jie Wu Jun Shao Shui-Liang Chen Hao-Qing hou Sheng Xiang College of Chemistry&Chemical Engineering and Nanofiber Engineering Center of jiangxi Province Jiangxi Normal UniversityNanchang330022China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang330022China Wenzhou Institute University of Chinese Academy of SciencesWenzhou325001China

For a polymer/polymer dismissible blend with two crystallizable components,the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important,but did not investigate in detail.In this study,the L-poly(lactic acid)/polypropylene(PLLA/PP)blends with different weight ratios were prepared by melt mixing and the crystallization behavior of the blends were investigated.Results showed that the crystalline structures of PLLA and PP were not altered by the composition.For the crystallization of PLLA,both the diffusion of chain segments and crystallization rate were enhanced under the existence of PP crystals.For the crystallization of PP,its crystallization rate was depressed under the existence of amorphous PLLA molecular chains.When the PP crystallized from the existence of PLLA crystals,although the diffusion rate of PP was reduced by PLLA crystals,the nucleation positions were obviously enhanced,which accelerated the formation of PP crystals.This investigation would supply more basic data for the application of PLLA/PP blend.

关键词： L-poly(lactic acid) Polypropylene Blends Crystalization behavior Crystallization acceleration

First Digit Distributions of Gamma-Ray Bursts

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第5期24卷 70-75页

作者： hou-Yu Lai Jun-Jie wei Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China

The occurrence of the first significant digits from real world sources is usually not equally distributed,but is consistent with a logarithmic distribution instead,known as Benford’s law.In this work,we perform a comprehensive investigation on the first digit distributions of the duration,fluence,and energy flux of gamma-ray bursts (GRBs) for the first time.For a complete GRB sample detected by the Fermi satellite,we find that the first digits of the duration and fluence adhere to Benford’s law.However,the energy flux shows a significant departure from this law,which may be due to the fact that a considerable part of the energy flux measurements is restricted by lack of spectral information.Based on the conventional duration classification scheme,we also check if the durations and fluences of long and short GRBs (with duration T_(90)>2 s and T_(90)≤2 s,respectively) obey Benford’s law.We find that the fluences of both long and short GRBs still agree with the Benford distribution,but their durations do not follow Benford’s law.Our results hint that the long–short GRB classification scheme does not directly represent the intrinsic physical classification scheme.

关键词： (stars:)gamma-ray burst general-methods statistical-astronomical databases miscellaneous

Changes of sex ratio at birth and son preferences in China:a mixed method study

在线全文

学校读者我要写书评

暂无评论

China Population and Development Studies 2024年第1期8卷 1-27页

作者： Mengjun Tang jiawei hou China Population and Development Research Center BeijingChina Sun Yat-Sen University GuangzhouChina

In 2020,China’s sex ratio at birth(SRB)stood at 111.3,still exhibiting a notable bias.Son preference ranks as the most essential and fundamental reason for the skewed SRB.This study,using a mixed-methods approach,seeks to address what the temporal changes and regional differences in SRB and the gender preferences are in China,whether and why son preference persists,how people practice such preferences and how they relate to the persistently high SRB in the Chinese con-text.Analysis of data from five national sample surveys finds that son preference is waning and daughter preference is gaining momentum,consistent with significant downward trends in SRB.The study also reveals that value shifts and intergenera-tional relations have a strong influence on gender preferences and their translation into reproductive behavior.Additionally,this study highlights the challenges that are hindering the decline in son preference,suggesting that more efforts are needed to empower women and to change social norms.

关键词： Sex ratio at birth·Son preference·Gender equity·Population structure·China

Evolution of chemistry and selection technology for DNA-encoded library

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第2期14卷 492-516页

作者： Peixiang Ma Shuning Zhang Qianping Huang Yuang Gu Zhi Zhou wei hou wei Yi Hongtao Xu Shanghai Key Laboratory of Orthopedic Implants Department of OrthopedicsShanghai Ninth People’s HospitalShanghai Jiao Tong UniversitySchool of MedicineShanghai 200025China Shanghai Institute for Advanced Immunochemical Studies ShanghaiTech UniversityShanghai 201210China Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target&Clinical Pharmacology The NMPA and State Key Laboratory of Respiratory DiseaseGuangzhou Medical UniversityGuangzhou 511436China College of Pharmaceutical Science and Institute of Drug Development&Chemical Biology Zhejiang University of TechnologyHangzhou 310014China

DNA-encoded chemical library(DEL)links the power of amplifiable genetics and the nonself-replicating chemical phenotypes,generating a diverse chemical world.In analogy with the biological world,the DEL world can evolve by using a chemical central dogma,wherein DNA replicates using the PCR reactions to amplify the genetic codes,DNA sequencing transcripts the genetic information,and DNA-compatible synthesis translates into chemical phenotypes.Importantly,DNA-compatible synthesis is the key to expanding the DEL chemical space.Besides,the evolution-driven selection system pushes the chemicals to evolve under the selective pressure,i.e.,desired selection strategies.In this perspective,we summarized recent advances in expanding DEL synthetic toolbox and panning strategies,which will shed light on the drug discovery harnessing in vitro evolution of chemicals via DEL.

关键词： DNA-encoded library Drug discovery High-throughput selection DNA-compatible synthesis In vitro evolution Chemical central dogma

Activation of NRF2 by celastrol increases antioxidant functions and prevents the progression of osteoarthritis in mice

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2024年第2期22卷 137-145页

作者： LIU Mingming GUO jiatian ZHAO Jing LI Hongye FENG Xiaoxiao LIU Haojun ZHANG Hao jia Xuejun wei Rushuai LI Fang CHEN Chong hou Mingzhuang LV Nanning XU Haiyan Department of human anatomy Xuzhou Medical UniversityXuzhou 221004China Department of Orthopedic Surgery The Affiliated Lianyungang Clinical College of Xuzhou Medical University(The Second People’s Hospital of Lianyungang)Lianyungang 222003China Department of Orthopaedics The First Afliated Hospital of Soochow UniversitySoochow UniversitySuzhou 215006China Institute of Hematology Xuzhou Medical UniversityXuzhou 221004China

Excessive oxidative stress impairs cartilage matrix metabolism balance,significantly contributing to osteoarthritis(OA)development.Celastrol(CSL),a drug derived from Tripterygium wilfordii,has recognized applications in the treatment of cancer and immune system disorders,yet its antioxidative stress mechanisms in OA remain underexplored.This study aimed to substantiate CSL’s chondroprotective effects and unravel its underlying mechanisms.We investigated CSL’s impact on chondrocytes under both normal and inflammatory conditions.In vitro,CSL mitigated interleukin(IL)-1β-induced activation of proteinases and promoted cartilage extracellular matrix(ECM)synthesis.In vivo,intra-articular injection of CSL ameliorated cartilage degeneration and mitigated subchondral bone lesions in OA mice.Mechanistically,it was found that inhibiting nuclear factor erythroid 2-related factor 2(NRF2)abrogated CSL-mediated antioxidative functions and exacerbated the progression of OA.This study is the first to elucidate the role of CSL in the treatment of OA through the activation of NRF2,offering a novel therapeutic avenue for arthritis therapy.

关键词： Osteoarthritis Celastrol Articular cartilage Extracellular matrix NRF2

Small intestine angioleiomyoma as a rare cause of perforation:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第12期12卷 2116-2121页

作者： Teng-Yuan hou wei-Juo Tzeng Pei-Hang Lee Department of General Surgery Kaohsiung Chang Gung Memorial HospitalKaohsiung 833Taiwan Department of Anatomical Pathology Kaohsiung Chang Gung Memorial HospitalKaohsiung 833Taiwan

BACKGROUND Angioleiomyoma is a rare and benign stromal tumor typically found in subcutaneous tissue.It rarely occurs in the gastrointestinal tract.Among the reported cases,the most common complication was gastrointestinal bleeding.Perforation has only been reported as a complication in the last few decades.CASE SUMMARY This case report detailed the discovery of intestinal angioleiomyoma in a 47-yearold male presenting with abdominal pain that had persisted for 3 d.After suspecting hollow organ perforation,surgical intervention involving intestinal resection and anastomosis was performed.CONCLUSION The report underscores the significance of early surgical intervention in effectively treating angioleiomyoma while emphasizing the pivotal role of timely and appropriate measures for favorable outcomes.

关键词： Angioleiomyoma Intestinal perforation Abdomen Acute Diarrhea Case report

JW-1-283 inhibits melanoma tumor growth via stabilization of the p53 pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第3期11卷 18-21页

作者： Yang Xie Ruida hou Kelli LHartman jianxiong jiang Zhongzhi Wu wei Li Drug Discovery Center College of PharmacyUniversity of Tennessee Health Science CenterMemphisTN38163USA

Melanoma is a lethal skin malignancy and the fifth most diagnosed cancer in the United States.1 Currently,for unresectable melanoma,the recommended treatment options include checkpoint inhibitor immunotherapy targeting programmed cell death 1(PD-1),and inhibitors targeting the mitogen-activated protein kinase(MAPK)pathway.However,the response rate may vary among the patients,and therefore demanding the development of novel treatment strategies.Tumor suppressor TP53has been suggested as one of the critical regulators mediating the aggressiveness and progression of melanoma.

关键词： melanoma suppressor death