检索结果-南通市图书馆

Journal of Coal Science & Engineering(China) 2009年第1期15卷 94-97页

作者： XIAO Cang-yan GUO Li-wen zheng ning College of Light Industry Hebei Polytechnic University Tangshan 063020 China College of Resource and Environment Hebei Polytechnic University Tangshan 063009 China

Dispersed coal was analyzed and rock experiment was conducted on four coalsof medium-low rank in the aspect of coal and rock configuration, which resulted in eightcoal samples mostly of the vitrinoid group or inert group. Then, an adsorption experimentof CO under different temperatures and pressures as well as a diffusion experiment undernormal temperature and pressure were conducted. The research results indicate that formedium-low rank coal, because the pore structure in the inert group is bigger than that inthe vitrinoid group, the influence on CO adsorption-proliferation of the inert group is biggerthan that in the vitrinoid group, and the adsorption quantity of the inert group is more susceptive. The difference of adsorption quantity between the two groups diminish along withthe improvement of coalification degree. The difference of adsorption quantity between thetwo groups shows no obvious change along with the change of temperature.

关键词： CO adsorption proliferation microstructure

PCT:Point cloud transformer

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2021年第2期7卷 187-199页

作者： Meng-Hao Guo Jun-Xiong Cai zheng-ning Liu Tai-Jiang Mu Ralph R.Martin Shi-Min Hu BNRist Department of Computer Science and TechnologyTsinghua UniversityBeiing 100084China Cardiff University Cardiff CF243

The irregular domain and lack of ordering make it challenging to design deep neural networks for point cloud *** paper presents a novel framework named Point Cloud Transformer(PCT)for point cloud *** is based on Transformer,which achieves huge success in natural language processing and displays great potential in image *** is inherently permutation invariant for processing a sequence of points,making it well-suited for point cloud *** better capture local context within the point cloud,we enhance input embedding with the support of farthest point sampling and nearest neighbor *** experiments demonstrate that the PCT achieves the state-of-the-art performance on shape classification,part segmentation,semantic segmentation,and normal estimation tasks.

关键词： 3D computer vision deep learning point cloud processing Transformer

A novel spiking neural network of receptive field encoding with groups of neurons decision

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2018年第1期19卷 139-150页

作者： Yong-qiang MA Zi-ru WANG Si-yu YU Ba-dong CHEN Nan-ning zheng Peng-ju REN Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University

Human information processing depends mainly on billions of neurons which constitute a complex neural network,and the information is transmitted in the form of neural *** this paper,we propose a spiking neural network(SNN),named MD-SNN,with three key features:(1) using receptive field to encode spike trains from images;(2) randomly selecting partial spikes as inputs for each neuron to approach the absolute refractory period of the neuron;(3) using groups of neurons to make *** test MD-SNN on the MNIST data set of handwritten digits,and results demonstrate that:(1) Different sizes of receptive fields influence classification results significantly.(2) Considering the neuronal refractory period in the SNN model,increasing the number of neurons in the learning layer could greatly reduce the training time,effectively reduce the probability of over-fitting,and improve the accuracy by 8.77%.(3) Compared with other SNN methods,MD-SNN achieves a better classification;compared with the convolution neural network,MD-SNN maintains flip and rotation invariance(the accuracy can remain at 90.44% on the test set),and it is more suitable for small sample learning(the accuracy can reach 80.15%for 1000 training samples,which is 7.8 times that of CNN).

关键词： Tempotron Receptive field Difference of Gaussian(DoG) Flip invariance Rotation invariance

Colonic tubular duplication combined with congenital megacolon:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第34期10卷 12768-12774页

作者： Zhe-Ming Zhang Shuai Kong Xin-Xin Gao Xiang-Hao Jia Chun-ning zheng School of Clinical Medicine Weifang Medical UniversityWeifang 261053Shandong ProvinceChina Department of Gastrointestinal Surgery Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250000Shandong ProvinceChina

BACKGROUND Colonic duplication refers to a spherical or tubular cavity which shows similar properties with the native colon and is attached to the mesenteric side of the alimentary *** is the rarest in alimentary tract *** upon anatomic feature,colonic duplications can be classified as spherical(cystic)or tubular,with the latter being less common(approximately 20%).Symptoms of colonic duplication are dependent on the duplication site and extent,and patient age,***,patients with colonic duplication manifest typical intestinal obstruction,potentially accompanied by recurrent dark or bright red bloody stool,varying degrees of anemia-related symptoms,and body *** SUMMARY A young male patient was admitted to our hospital due to recurrent abdominal *** definite diagnosis was achieved by computed tomography(CT)or electronic colonoscopy,and the bowel preparation efficacy was *** disease was suspected,and thus laparoscopic exploration was *** approximately 60-cm-long inverted duplicated colon with severe edema and dilation was *** originated from the mesenteric side of the transverse colon and ended in the terminal part of the descending colon with a blind *** parallel native colon had a thickened colonic wall,became stiff,and was poor in *** patient then underwent subtotal colectomy and was discharged 7 d after the *** 3 mo post-surgery to date,the patient had regular bowel movement once daily and a steady increase in body *** Tubular colonic duplication is a rare type of alimentary tract duplication that can be detected by ultrasonography,CT,or magnetic resonance imaging based on the actual clinical *** resection of aberrant colon(including the duplicated colonic segment and other potentially involved colonic segments)is the only approach to cure this medical condition.

关键词： Colonic duplication Chronic constipation Subtotal colectomy Congenital megacolon Case report

Nutritional factors and gastric cancer in Zhoushan Islands, China

维普期刊数据库评论

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 Gastroenterology 2005年第28期11卷 4311-4316页

作者： Jiong-Liang Qiu Jian-ning zheng Kun Chen Jian-Yue Wang Li-Jun Zhang Li-Ming Sui Department of Health and Quarantine Ningbo Entry-Exit Inspection and Quarantine BureauNingbo 315012 Zhejiang Province China Department of Epidemiology Zhejiang University School of Public Health Hangzhou 310006 Zhejiang Province China Zhoushan Center for Disease Prevention and Control Zhoushan 316000 Zhejiang Province China Jiangdong Center for Disease Prevention and Control Ningbo 315000 Zhejiang Province China

AIM: To investigate the association between nutrient intakes and high incidence rate of gastric cancer among residents in Zhoushan ***: A frequency-matched design of case-control study was used during the survey on dietary factors and gastric cancer in Zhoushan Islands, China. A total of 103 cases of gastric cancer diagnosed in 2001 were included in the study and 133 controls were randomly selected from the residents in Zhoushan Islands. A food frequency questionnaire was specifically designed for the Chinese dietary pattern to collect information on dietary intake. A computerized database of the dietary and other relative information of each participant was completed. Total calories and 15 nutrients were calculated according to the food composition table and their adjusted odds ratios (ORs) and 95% confidence intervals (CIs) were estimated by gender using unconditional logistic regression ***: High intakes of protein, saturated fat, and cholesterol were observed with the increased risk of gastric cancer particularly among males (ORQ4 vsQ1 were 10.3, 3.24, 2.76 respectively). While carbohydrate was a significant high-risk nutrient (ORQ4 vsQ1 = 14.8; Pfor linear trend = 0.024) among females. Regardless of their gender, the cases reported significantly higher daily intake of sodium mainly from salts. As to the nutrients of vitamins A and C, an inversed association with the risk of GC was found. Baseline characteristics of participants were briefly ***: The findings from this study confirm the role of diet-related exposure in the etiology of gastric cancer from the point of view of epidemiology. An increased risk of gastric cancer is associated with high intakes of protein, saturated fat, cholesterol and sodium,while consumption of polyunsaturated fat, vitamin A and ascorbic acid may have a protective effect against gastric cancer.

关键词： Gastric cancer Nutrient intake Case-control Risk factor Protective effect Antioxidants

Synthesis and Complexation Properties of Novel Biscalixarene Composed of Calix[4]arene and Thiacalix[4]arene Subunits

维普期刊数据库评论

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 Chemical Letters 2006年第8期17卷 1029-1032页

作者： Fa Fu YANG Xia ZHAO Cui Yu HUANG Hong Yu GUO Si ning zheng Qi PENG College of Chemistry and Materials Fujian Normal University Fuzhou 350007 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter China Academy of Science Fuzhou 350002

The first example of biscalixarene composed of calix[4]arene and thiacalix[4]arene subunits 3 was facilely synthesized and showed good complexation properties for metal cations and zwitterionic α-amino acids.

关键词： Biscalixarene thiacalixarene complexation cation amino acid.

Studies on the structure and catalytic performance of S and P promoted Na-W-Mn-Zr/SiO_2 catalyst for oxidative coupling of methane

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2010年第1期19卷 15-20页

作者： Wen zheng, Dangguo Cheng, ning Zhu, Fengqiu Chen, Xiaoli Zhan Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 Zhejiang China

A series of Na-W-Mn-Zr/SiO2 catalysts promoted by different contents of S or/and P were prepared and their catalytic performance for oxidative coupling of methane was investigated to clarify the effect of S and P on the Na-W-Mn-Zr/SiO2 catalyst. The catalysts were characterized by X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. From the characterization results, it is found that the addition of S and P to the Na-W-Mn-ZffSiO2 catalyst helps the formation of active phases, such as α-cristobalite, Na2WO4, ZrO2, and Na2SO4. Moreover, the addition of S and P increases the concentration of surface-active oxygen species by improving the migration of active components from the bulk phase to the surface of the catalyst. According to the activity test, impressive methane conversion and C2 hydrocarbons yield were obtained at a low temperature of 1023 K over the six-component Na-W-Mn-Zr-S-P/SiO2 catalyst, which contained 2 wt% S and 0.4 wt% P simultaneously. The deactivation of Na-W-Mn-Zr-S-P/SiO2 was due to the loss of surface active components.

关键词： oxidative coupling of methane Na-W-Mn-Zr/SiO2 S P

Effect of Interstitial Media on Segregation in Vertically Vibrated Granular Mixtures

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第1期30卷 112-115页

作者： YUAN Xiao-Xian LI Liang-Sheng WEN Ping-Ping SHI Qing-Fan zheng ning School of Physics Beijing Institute of TechnologyBeijing 100081 Science and Technology on Electromagnetic Scattering Laboratory Beijing 100854

Vertically vibrated segregation behaviors of binary granular mixtures with different interstitial media are experimentally *** study the role of interstitial media on the segregation,two types of interstitial fluids are adopted and the resulting phase diagrams are *** water-immersed granular mixture exhibits two kinds of complete segregation behaviors:Brazil nut effect and sandwich patterns,at least the latter is absent in the same air-immersed ***,the segregation extent is improved remarkably for the water-immersed *** experimental observation further confirms that the effect of interstitial media on the relative motion of grains is one of the predominant mechanisms for granular segregation.

关键词： immersed Vertical effect

Propionate promotes gluconeogenesis by regulating mechanistic target of rapamycin(mTOR)pathway in calf hepatocytes

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2023年第4期15卷 88-98页

作者： Guo Yan Wang Sen Lin Qin Yi ning zheng Hui Jun Geng Lei Chen Jun Hu Yao Lu Deng College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi 712100China

Enhancing hepatic gluconeogenesis is one of the main modes of meeting the glucose requirement of dairy *** study attempted to determine whether the gluconeogenesis precursor propionate had an effect on the expression of the main genes involved in gluconeogenesis in calf hepatocytes and elucidate the associated *** hepatocytes were obtained from 5 healthy calves(1 d old;30to 40 kg)and exposed to 0-,1-,2.5-,or 5-mM sodium propionate(NaP),which is known to promote the expression of genes involved in the gluconeogenesis pathway,including fructose 1,6-bisphosphatase,phosphoenolpyruvate carboxykinase,and *** regard to the underlying mechanism,propionate promoted the expression of peroxisome proliferator-activated receptor gamma coactivator 1-alpha,hepatocyte nuclear factor 4,and forkhead box O1(transcription factors that regulate the expression of hepatic gluconeogenic genes)by promoting mammalian target of rapamycin complex 1(mTORC1),but inhibiting mTORC2 activity(P<0.01).We also established a model of palmitic acid(PA)-induced hepatic injury in calf hepatocytes and found that PA could inhibit the gluconeogenic capacity of calf hepatocytes by suppressing the expression of gluconeogenic genes,inhibiting m TORC1,and promoting the activity of m TORC2(P<0.01).In contrast,NaP provided protection to calf hepatocytes by counteracting the inhibitory effect of PA on the gluconeogenic capacity of calf hepatocytes(P<0.05).Collectively,these findings indicate that NaP enhances the gluconeogenic capacity of calf hepatocytes by regulating the mTOR pathway ***,in addition to improving the glucose production potential,propionate may have therapeutic potential for the treatment of hepatic injury in dairy cows.

关键词： Propionate Gluconeogenesis Mechanistic target of rapamycin Palmitic acid

Review:Whole genome amplification in preimplantation genetic diagnosis

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第1期12卷 1-11页

作者： Ying-ming zheng ning WANG Lei LI Fan JIN Department of Reproductive Endocrinology Women's Hospital School of Medicine Zhejiang University Hangzhou 310006 China

Preimplantation genetic diagnosis (PGD) refers to a procedure for genetically analyzing embryos prior to implantation,improving the chance of conception for patients at high risk of transmitting specific inherited *** method has been widely used for a large number of genetic disorders since the first successful application in the early *** chain reaction (PCR) and fluorescent in situ hybridization (FISH) are the two main methods in PGD,but there are some inevitable shortcomings limiting the scope of genetic ***,different whole genome amplification (WGA) techniques have been developed to overcome these *** DNA can be amplified and multiple tasks which need abundant DNA can be ***,WGA products can be analyzed as a template for multi-loci and multi-gene during the subsequent DNA *** this review,we will focus on the currently available WGA techniques and their applications,as well as the new technical trends from WGA products.

关键词： Whole genome amplification Multiple displacement amplification Primer extension preamplification Degenerate oligonucleotide primed-polymerase chain reaction Preimplantation genetic diagnosis