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Effect of MgO on Oxidation Process of Fe_3O_4 in Pellets

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Journal of Iron and Steel Research International 2016年第10期23卷 1007-1011页

作者： Qiang-jian GAO Yan-song SHEN Xin JIANG Hai-yan ZHENG Feng-man SHEN chang-sheng liu School of Metallurgy Northeastern University School of Chemical Engineering University of New South Wales

Induration process of oxidized pellets involves the oxidation of Fe3O4 and re-crystallization of *** oxidation process of Fe3O4 is significant for pellets to obtain better ambient ***,the effect of MgO on oxidation process of Fe3O4 was *** unreacted core model was applied to analyze the oxidizing induration process of *** experimental results show that MgO plays a negative role in the oxidation process of *** oxidation rate of Fe3O4 in MgO-fluxed pellets（95.0% Fe3O4 ＋5.0% MgO）is slower than that in standard acid pellets（100% Fe3O4）.The relation between oxidation ratio of Fe3O4 and time was calculated based on the unreacted core model for both MgO-fluxed pellets and standard acid *** to verification experiments,the values calculated by model coincide well with the experimental ***,the unreacted core model could be applied to describe the oxidizing induration process of pellets.

关键词： MgO-fluxed pellet Fe3O4 oxidation unreacted core model

Laser cladding of high-entropy alloy on H13 steel

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Rare Metals 2014年第6期33卷 727-730页

作者： Xiao-Tao liu Wen-Bin Lei Jie Li Yu Ma Wei-Ming Wang Bao-Hua Zhang chang-sheng liu Jian-Zhong Cui The Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University School of Materials and Metallurgy Northeastern University

High-entropy alloy layer up to 150 lm in thickness was formed on H13 substrate with a metallurgical bonding at the coating/substrate interface. Simple solid solution phases were formed in the coating layer with a typical microstructure composed of both dendrite and interdendrite. The microstructure at the top of the cladding zone consists of equiaxed grains while that at the bottom consists of columnar grains. The coating layer exhibits great enhancement in microhardness and wear resistance compared with the H13 substrate.

关键词： Laser cladding High-entropy alloy Microhardness Wear rate

Quantile Regression under Truncated, Censored and Dependent Assumptions

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Acta Mathematicae Applicatae Sinica 2024年

作者： chang-sheng liu Yun-jiao LU Si-li NIU School of Mathematics and Physics Henan University of Urban Construction School of Mathematical Sciences Tongji University

In this paper, we focus on the problem of nonparametric quantile regression with left-truncated and right-censored data. Based on Nadaraya-Watson(NW) Kernel smoother and the technique of local linear(LL) smoother, we construct the NW and LL estimators of the conditional quantile. Under strong mixing assumptions, we establish asymptotic representation and asymptotic normality of the estimators. Finite sample behavior of the estimators is investigated via simulation, and a real data example is used to illustrate the application of the proposed methods.

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不同pH下糖蜜废水的厌氧产酸发酵类型及微生物群落结构解析

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环境科学研究 2016年第9期29卷 1370-1377页

作者：昌盛刘枫中国环境科学研究院水环境科学研究所北京100012 哈尔滨工业大学市政环境工程学院黑龙江哈尔滨150090

为寻求厌氧产酸发酵反应器的适宜控制参数和微生物学机制，以ACR（厌氧接触式发酵制氢反应器）为试验平台，通过分阶段调控反应器的pH，考察不同pH下ACR系统的产酸发酵类型和产氢性能，并采用聚合酶链式反应-变性梯度凝胶电泳（PCR-DGG... 详细信息

为寻求厌氧产酸发酵反应器的适宜控制参数和微生物学机制，以ACR（厌氧接触式发酵制氢反应器）为试验平台，通过分阶段调控反应器的pH，考察不同pH下ACR系统的产酸发酵类型和产氢性能，并采用聚合酶链式反应-变性梯度凝胶电泳（PCR-DGGE）技术对微生物群落结构进行了解析．以糖蜜废水为基质，以城市污水厂剩余污泥为种泥，在污泥接种量（以MLVSS计）为3．58g／L、进水ρ（CODCr）为5000mg／L、HRT为12h条件下，分别考察了系统在pH为6．0-6．5、5．5～6．0、5．0-5．5、4．5～5．0条件下的运行特性．结果表明，在pH为4．5～5．O时，系统中以Ethanoligenens harbinense YUAN-3为代表的产氢菌群占优，呈现典型的乙醇型发酵特征，活性污泥表现出的产氢性能最佳，其氢气转化率和污泥的比产氢速率分别为1．9tool／tool和7．8mmol／（g·d）．在pH为5．5～6．5、5．0～5．5的条件下，Clostridium tyrobutyricum strain A1-3、Propionibacterium sp．B2M2分别成为优势菌群，系统分别呈现出丁酸型发酵、混合酸发酵类型．研究显示，随着pH的改变，系统内的产酸发酵菌群随之发生更迭，在不同pH控制水平下形成不同的顶级微生物群落结构，进而使得系统呈现出不同发酵类型和产氢性能．

关键词：厌氧接触式反应器产酸发酵发酵类型 pH 微生物群落

Evaluation of contrast-enhanced helical hydro-CT in staging gastric cancer

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World Journal of Gastroenterology 2005年第29期11卷 4592-4595页

作者： Wen-Zhou Wei Jie-Ping Yu Jun Li chang-sheng liu Xiao-Hua Zheng chang-sheng liu Xiao-Hua Zheng Department of Radiology Renmin Hospital of Wuhan University Wuhan 430060 Hubei Province China Department of Gastroenterology Renmin Hospital of Wuhan University Wuhan 430060 Hubei Province China Department of Stomotology Renmin Hospital of Wuhan University Wuhan 430060 Hubei Province China

AIM： TO discuss the helical computed tomography （CT） characteristics of gastric cancer and evaluate the diagnostic value of contrast-enhanced helical hydro-CT （HHCT） in staging gastric cancer. METHODS： A total of 50 patients with gastric cancer were included in this study. The CT findings in them were retrospectively analyzed and correlated with pathologic findings at surgery. All patients were preoperatively imaged by plain and contrast-enhanced helical CT afer orally ingesting 1 000-1 500 mL water. Peristalsis was minimized by intravenous administration of spasmolytics. RESULTS： The foci of gastric cancer became more prominent in all the 50 patients and showed strong enhancement in contrast-enhanced HHCT. The tumor was located at the gastric cardia in 14 cases, at the gastric fundus in 3 cases, at the gastric body in 8 cases, at the gastric antrum in 4 cases, at the gastric fundus and the body in 8 cases, at the gastric body and antrum in 11 cases, and at three segments of the stomach in 2 cases. The CT features of gastric cancer were focal or diffuse mural thickening, soft tissue mass, cancerous ulcer, stenosis of stomach, infiltration to adjacent tissues, lymph node and distant metastases. Strong contrast enhancement of the gastric wall was closely related to gastric cancer. The accuracy rate of contrast-enhanced HHCT in staging gastric cancer was 86% （43/50）. The detection rate of lymph node metastases by CT was 60% （12/20）. CONCLUSION： Contrast-enhanced HHCT is a reliable method to diagnose and stage gastric cancer.

关键词： Stomach Neoplasm Tomography X-ray Staging

Clinical factors associated with the number of gallbladder polyps

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Chinese Medical Journal 2020年第22期133卷 2751-2752页

作者： Wen-Juan Lu chang-sheng liu Hong-Yan Li Lan-Lan Zang Fan-Zhi Meng Jing-Hua liu Department of Laboratory Junan County People's HospitalLinyiShandong 276600China Department of Medical Examination Junan County People's HospitalLinyiShandong 276600China Central Laboratory Linyi People's HospitalLinyiShandong 276000China Department of Hepatobiliary Surgery Linyi People's HospitalLinyiShandong 276000China Prof.Cai's Laboratory Linyi People's HospitalLinyiShandong 276000China

Gallbladder polyps(GBPs),which are defined as a pathological change protruding from the gallbladder mucosa,are one of the main causes of hospital admission for *** incidence of GBPs is 4.2 to 9.5%in *** date,the etiology of GBPs has not yet been clearly *** to previous studies,metabolic status is strongly associated with GBPs.⑵A single polyp is more likely to exhibit a malignant transformation,and large(diameter greater than 10 mm)single polyps should be resected together with the entire ***,multiple polyps seem unlikely to ***,number of GBPs is an important factor that affects the treatment of ***,clinical factors associated w让h the number of GBPs are not completely understood;therefore,the aim of the current study is to investigate these factors.

关键词： gallbladder polyps Clinical

High pressure EIGA preparation and 3D printing capability of Ti-6Al-4V powder

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Transactions of Nonferrous Metals Society of China 2020年第1期30卷 147-159页

作者： Kuai-kuai GUO chang-sheng liu Sui-yuan CHEN Huan-huan DONG Si-yu WANG School of Material Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory for Laser Application Technology and Equipment of Liaoning Province Northeastern UniversityShenyang 110819China

Ti-6 Al-4 V alloy powder was processed by electrode induction melting gas atomization(EIGA)at high gas pressure(5.5-7.0 MPa).The effects of atomizing gas pressure on the powder characteristics and the microstructure,along with the mechanical properties of the as-fabricated block by laser melting deposition(LMD),were *** results indicate that the diameters of powders are distributed in a wide range of sizes from 1 to 400μm,and the median powder size(d50)decreases with increasing gas *** powders with a size fraction of 100-150μm obtained at gas pressures of 6.0 and 6.5 MPa have better *** oxygen content is consistent with the change trend of gas pressure within a low range of 0.06%-0.20%.Specimens fabricated by LMD are mainly composed ofα+βgrains with a fine lamellar Widmanstatten structures and have the ultimate tensile strength(UTS)and yield strength of approximately 1100 and 1000 MPa,***,the atomized powders have a favorable 3 D printing capability,and the mechanical properties of Ti-6 Al-4 V alloys manufactured by LMD typically exceed those of their cast or wrought counterparts.

关键词： Ti-6Al-4V powder high pressure gas atomization particle size flowability 3D printing capability

2种启动方式下CSTR厌氧甲烷发酵系统的运行特性比较

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环境工程学报 2017年第2期11卷 689-694页

作者：昌盛刘枫李建政中国环境科学研究院环境基准与风险评估国家重点实验室北京100012 中国环境科学研究院国家环境保护饮用水水源地保护重点实验室北京100012 哈尔滨工业大学市政环境工程学院哈尔滨150090

厌氧产甲烷菌生长缓慢,对生境环境尤为敏感,其富集难且慢,所以厌氧反应器的快速启动一直是热点研究问题。为摸清连续流搅拌槽式反应器(CSTR)处理糖蜜废水的适宜启动条件和调控方法,比较了两种启动方式下CSTR厌氧甲烷发酵系统的运行特性... 详细信息

厌氧产甲烷菌生长缓慢,对生境环境尤为敏感,其富集难且慢,所以厌氧反应器的快速启动一直是热点研究问题。为摸清连续流搅拌槽式反应器(CSTR)处理糖蜜废水的适宜启动条件和调控方法,比较了两种启动方式下CSTR厌氧甲烷发酵系统的运行特性。结果显示,以啤酒废水污水处理车间的剩余污泥为种泥,在HRT为18 h、温度35℃条件下,进水COD为4 000 mg·L^(-1)时直接启动CSTR厌氧反应器,系统因挥发酸积累,产甲烷菌群活性受限,难以富集培养,经过近103d的运行,系统未形成高效的厌氧甲烷发酵微生物菌群结构体系;而当采用保持HRT18 h不变,进水COD阶段性提升至4000 mg·L^(-1)的启动方式时,产甲烷菌群活性较高,能在较短时间内得到有效富集和培养,CSTR能成功培养具有完整甲烷发酵功能的微生物菌,COD去除率可在65 d内达到56%,反应器成功启动。

关键词：厌氧消化糖蜜废水 CSTR 启动负荷 COD去除率

Interconnections between diabetic corneal neuropathy and diabetic retinopathy:diagnostic and therapeutic implications

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Neural Regeneration Research 2025年第8期20卷 2169-2180页

作者： Mingyi Yu Faith Teo En Ning chang liu Yu-Chi liu Tissue Engineering and Stem Cell Group Singapore Eye Research InstituteSingapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CenterSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore

Diabetic corneal neuropathy and diabetic retinopathy are ocular complications occurring in the context of diabetes *** corneal neuropathy refers to the progressive damage of corneal *** retinopathy has traditionally been considered as damage to the retinal ***,growing evidence suggests that diabetic retinopathy is a complex neurovascular disorder resulting from dysfunction of the neurovascular unit,which includes both the retinal vascular structures and neural *** retinopathy is one of the leading causes of blindness and is frequently screened for as part of diabetic ocular ***,diabetic corneal neuropathy is commonly overlooked and underdiagnosed,leading to severe ocular surface *** studies have found that these two conditions tend to occur together,and they share similarities in their pathogenesis pathways,being triggered by a status of chronic *** review aims to discuss the interconnection between diabetic corneal neuropathy and diabetic retinopathy,whether diabetic corneal neuropathy precedes diabetic retinopathy,as well as the relation between the stage of diabetic retinopathy and the severity of corneal *** also endeavor to explore the relevance of a corneal screening in diabetic eyes and the possibility of using corneal nerve measurements to monitor the progression of diabetic retinopathy.

关键词： cornea corneal nerves diabetes diabetic corneal neuropathy diabetic retinopathy retina