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A Dynamic Method for Quantifying Natural Warming in Urban Areas

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Atmospheric and Oceanic Science letters 2012年第5期5卷 408-413页

作者： HE Yu-Ting jia gen-Suo Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

In the study of global warming, one of the main issues is the quantification of the urbanization effect in climate records. Previous studies have contributed much to removing the impact of urbanization from surface air temperature by carefully selecting reference stations. However, due to the insufficient number of stations free from the influence of urbanization and the different criteria used to select reference stations, there are still significant controversies about the intensity of the impact of urbanization on temperature records. This study proposes a dynamic method for quantifying natural warming using information on urbanization from every station acquired from remote sensing (RS) data instead of selecting reference stations. Two different spatial scales were applied to examine the impact of urbanization, but little difference was found, indicating the stability of this method. The results showed a significant difference in original temperature data and the homogenized data-urban warming accounted for approximately 64% in the original temperature warming but only approximately 20% in the homogenized temperature records.

关键词： urbanization air temperature climate change remote sensing

Metastasis of esophageal squamous cell carcinoma to the thyroid gland with widespread nodal involvement: A case report

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World Journal of Clinical Cases 2020年第19期8卷 4588-4594页

作者： Xing Zhang Xin Gu jia-gen li Xian-Jie Hu Department of Thyroid and Breast Surgery The Affiliated People's Hospital of Ningbo UniversityNingbo 315040Zhejiang ProvinceChina Department of Pathology The Affiliated People's Hospital of Ningbo UniversityNingbo 315040Zhejiang ProvinceChina

BACKGROUND Esophageal cancer is one of the most common causes of cancer-related *** patients with esophageal cancer have distant metastases at the time of diagnosis,but metastasis to the thyroid gland(MTG)and multifocal thyroid lesions alone are extremely *** SUMMARY In this case report,we present a case of a 69-year-old male with esophageal *** patient visited our hospital for a routine body check-up,which revealed multifocal nodules in his thyroid lobes and enlarged cervical lymph nodes.A fine needle aspiration biopsy showed malignancies in both thyroid lesions and lymph *** patient was initially diagnosed with primary bilateral thyroid cancer that spread to his lymph nodes,and a total thyroidectomy was *** histology showed MTG and therefore,a diagnostic work-up was implemented to determine the primary tumor.A fluorine-18-deoxyglucose positron emission tomography scan showed that the lower part of the esophagus and the lymph nodes in the neck,chest,and abdomen were *** esophagogastroscopy and corresponding pathology revealed distal esophageal squamous cell *** esophageal MTG diagnosis was confirmed with pathological *** This case report highlights the difficulty in diagnosing esophageal *** may have no malignancy history and be *** diagnostic procedures are necessary after MTG is confirmed by cytology or histology,and the final diagnosis should be made according to the identification of the primary malignancy combined with pathological immunohistochemistry findings.

关键词： Esophageal squamous cell carcinoma Metastasis Thyroid gland Thyroidectomy lymph nodes Case report

Simultaneous realization of direct photodeposition and high H_(2)-production activity of amorphous cobalt sulfide nanodot-modified rGO/TiO_(2)photocatalyst

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Rare Metals 2021年第11期40卷 3125-3134页

作者： Feng Chen Hong-Fei Feng Wei luo Ping Wang Huo-gen Yu jia-Jie Fan School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China State Key laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

To realize highly efficient hydrogen production of graphene-based photocatalysts,it is greatly important to increase more interfacial active sites onto *** this work,the highly efficient CoS_(x)-rGO(reduced graphene oxide)/TiO_(2) composite photocatalyst was synthesized via a simple two-step method,including the hydrothermal loading of rGO nanosheets onto TiO_(2) nanoparticles and the subsequent photodeposition process of CoS_(x) nanodots(0.5-2 nm) on the rGO *** experimental results confirmed that the CoS_(x)-rGO/TiO_(2) photocatalyst displayed a distinctly higher photocatalytic H_(2)-evolution activity than the TiO_(2) *** highest hydrogen-production efficiency of obtained CoS_(x)-rGO/TiO_(2)(10%) achieved 256.97 μmol·h-1,which was distinctly higher than that of TiO_(2)(4.41 μmol·h-1),rGO/TiO_(2)(20.19 μmol·h^(-1)) and CoS_(x)/TiO_(2)(132.67 μmol·h^(-1)).According to the results of various characterizations and tests,the synergistic-effect mechanism of CoS_(x) nanodots and rGO nanosheets is proposed to explain the increased photocatalytic performance of Co S_(x)-rGO/TiO_(2) photocatalytic material,namely the rGO nanosheets cause the quick transfer of photo-induced carriers from TiO_(2) to CoS_(x) nanodots,and then CoS_(x) nanodots work as hydrogenproduction active sites to quickly generate H_(2).The present study may offer innovative ideas for the preparation and application of new highly efficient and inexpensive photocatalytic materials.

关键词： Photocatalysis Hydrogen evolution Titania Cobalt sulphide Direct photodeposition

On the vein-stiffening membrane structure of a dragonfly hind wing

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第1期10卷 72-81页

作者： Zhong-xue lI Wei SHEN gen-shu TONG jia-meng TIAN loc VU-QUOC Institute of Structural Engineering Zhejiang University Hangzhou 310058 China Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611 USA

Aiming at exploring the excellent structural performance of the vein-stiffening membrane structure of dragonfly hind wings,we analyzed two planar computational models and three 3D computational models with cambered corrugation based on the finite element *** is shown that the vein size in different zones is proportional to the magnitude of the vein internal force when the wing structure is subjected to uniform out-of-plane transverse *** membrane contributes little to the flexural stiffness of the planar wing models,while exerting an immense impact upon the stiffness of the 3D wing models with cambered *** a lumped mass of 10% of the wing is fixed on the leading edge close to the wing tip,the wing fundamental fre-quency decreases by 10.7%～13.2%;if a lumped mass is connected to the wing via multiple springs,the wing fundamental fre-quency decreases by 16.0%～18.0%.Such decrease in fundamental frequency explains the special function of the wing pterostigma in alleviating the wing quivering *** particular features of dragonfly wings can be mimicked in the design of new-style reticulately stiffening thin-walled roof systems and flapping wings in novel intelligent aerial vehicles.

关键词： Dragonfly wing Venation pattern Wing membrane Pterostigma Bionics Quivering effect

Abnormal Expression of Eukaryotic Translation Factors in Malignant Transformed Human Bronchial Epithelial Cells Induced by Crystalline Nickel Sulfide

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Biomedical and Environmental Sciences 2006年第1期19卷 53-60页

作者： YI-XIONG lEI XUE-MIN CHEN gen-RONG WO jia-KUN CHEN Department of Occupational and Environmental Health Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei China Department of Preventive Medicine Guangzhou Medical College Guangzhou 510182 Guangdong China

Objective To study the oncogenic potential of mouse translation initiation factor 3 （TIF3） and elongation factor-1δ （TEF-1δ） in malignant transformed human bronchial epithelial cells induced by crystalline nickel sulfide （NiS）. Methods Abnormal expressions of human TIF3 and TEF-1δ genes in two kinds of NiS-transformed cells and NiS-tumorigenic cell lines were investigated and analyzed by the reverse transcript polymerase chain reaction （RT-PCR） and fluorescent quantitative polymerase chain reaction （FQ-PCR）, respectively. Results RT-PCR analysis primarily showed that both human TIF3 and TEF-1δ mRNA expressions in two kinds of NiS-transformed cells and NiS-tumorigenic cell lines were increased as compared with controls. FQ-PCR assay showed that the levels of TIF3 expressions in the transformed cells and tumorigenic cells were 3 and 4 times higher respectively, and the elevated expressions of TEF-16 eDNA copies were 2.7- to 3.5-fold in transformed cells and 4.1- to 5.2-fold in tumorigenic cells when compared with non-transformed cells, indicating that the over-expressions of human TIF3 and TEF-1δ genes were related to malignant degree of the cells induced by nickel. Conclusions These findings demonstrate that there are markedly abnormal expressions of TIF3 and TEF-1δ genes during malignant transformation of human bronchial epithelial cell lines induced by crystalline NiS. They seem to be the molecular mechanisms potentially responsible for human carcinogensis due to nickel.

关键词： Nickel compounds Human cells Transformation Translation factors Fluorescent quantitative PCR

Simulated seasonal variations in nitrogen wet deposition over East Asia

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Atmospheric and Oceanic Science letters 2016年第2期9卷 99-106页

作者： YU Jin-Hai ZHANG Mei-gen lI jia-lin State Key laboratory of Atmospheric Boundary layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences

The regional air quality modeling system Regional Atmospheric Modeling System–Community Multiscale Air Quality was applied to estimate the spatial distribution and seasonal variation in nitrogen wet deposition over East Asia in 2010. The simulated results were evaluated by comparing modeled precipitation rates and ion concentrations, such as ammonium（NH_4~＋）, nitrate（NO_3^-）, and sulfate, in rainwater, against observations obtained from Acid Deposition Monitoring Network in East Asia and meteorological stations in China. Comparison of simulated and observed precipitation showed that the modeling system can reproduce seasonal precipitation patterns reasonably well. For major ion species, the simulated results in most cases were in good agreement with those observed. Analysis of the modeled wet deposition distributions indicated that China experiences noticeable variation in wet deposition patterns throughout the year. Nitrogen wet deposition（NH_4~＋＋ NO_3^-） during summer and spring accounted for 71% of the annual total（3.9 Tg N yr^（-1））, including 42.7% in summer. Precipitation plays a larger role in the seasonal variation of wet deposition; whereas, aerosol concentrations affect its distribution patterns. In China, the amount of annual nitrogen wet deposition ranged from 1 to 18 kg N ha^（-1）. Nitrogen in wet deposition was mainly in the form of NH_4~＋, accounting for 65.76% of the total amount, and the molar ratio of NH_4~＋∕NO_3^- was mostly more than 1, indicating a relatively larger effect from agricultural activities.

关键词： Nitrogen wet deposition CMAQ NH+4∕NO-3 ratio precipitation aerosol concentration

Colonoscopy-assisted removal of an impaction foreign body at the rectosigmoid junction: A case report

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World Journal of Clinical Cases 2024年第11期12卷 1990-1995页

作者： Peng-Fei Zhou Jin-gen lu jia-Dong Zhang jia-Wen Wang Department of Anorectal Surgery Longhua Hospital Shanghai University of Traditional Chinese MedicineShanghai 200000China

BACKGROUND When an anorectal foreign body is found,its composition and shape should be evaluated,and a timely and effective treatment plan should be developed based on the patient's symptoms to avoid serious complications such as intestinal perforation caused by displacement of the foreign *** SUMMARY A 54-year-old male was admitted to our outpatient clinic on June 3,2023,due to a rectal foreign body that had been embedded for more than 24 *** patient reported using a glass electrode tube to assist in the recovery of prolapsed hemorrhoids,however,the electrode tube was inadvertently inserted into the anus and could not be removed by the *** hospitalization,the patient underwent surgery,and the foreign body was dragged into the rectum with the aid of *** anus was dilated with a comb-type pulling hook and an anal fistula pulling hook to widen the anus and remove the foreign body,and the local anal symptoms were then relieved with topical *** patient was allowed to eat and drink,and an entire abdominal Computed tomography(CT)and colonoscopy were reviewed 3 d after *** revealed no foreign body residue and colonoscopy showed no metal or other residues in the colon and rectum,and no apparent intestinal tract *** The timeliness and rationality of the surgical and therapeutic options for this patient were based on a literature review of the clinical signs and conceivable conditions in such *** type,material and the potential risks of rectal foreign bodies should be considered.

关键词： Foreign body impaction Surgical therapy Rectum-sigmoid colon Colonoscopy Case report

Wideband underwater sonar imaging via compressed sensing with scaling effect compensation

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Science China(Information Sciences) 2015年第2期58卷 68-78页

作者： YAN HuiChen XU jia XIA Xiang-gen lIU Feng PENG ShiBao ZHANG XuDong lONG Teng Department of Electronic Engineering Tsinghua University School of Information and Electronic Beijing Institute of Technology Department of Electrical and Computer Engineering University of Delaware

By exploiting the sparsity of the imaging scene, compressed sensing(CS) imaging may provide an effective solution to cope with the tradeoff of high azimuth resolution and wide swath in synthetic aperture sonar imaging. However, existing CS imaging methods are based on narrowband signal model and the scaling effect on the echoes is normally omitted, which may seriously affect the ultimate image reconstruction *** paper establishes the wideband CS underwater sonar imaging model at first, where the scaling effect and Doppler frequency shift are jointly considered. Furthermore, two wideband CS imaging approaches are discussed in uniform scale-range space and velocity-range space, respectively. Besides, modified l1-norm minimization algorithms are proposed for the scene reconstruction in velocity-range space. Finally, numerical experiments are provided to demonstrate the effectiveness of the proposed model and the reconstruction algorithms.

关键词： compressed sensing sonar imaging wideband signal scaling effect modified l1 minimization

An Efficient Palladium-catalyzed Coupling Reaction for the Preparation of Biaryls and Polyaryls

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Chinese Chemical letters 2003年第1期14卷 13-16页

作者： Zhi Yong WANG Zheng gen ZHA jia Hai ZHANG Ji Hui WU Department of Chemistry University of Science and Technology of ChinaHefei 230026

In the case of Pd(PPh3)4 as catalyst and toluene as reaction solvent, the desired biaryls and polyaryls were synthesized in excellent yield and on a large scale.

关键词： Palladium-catalyst coupling reaction preparation biaryl polyaryl.