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Effect of calcium content on inclusions during the ladle furnace refining process of AISI 321 stainless steel

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1499-1507页

作者： Chao pan Xiao-jun Hu jian-chao Zheng Ping Lin Kuo-chih Chou State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgy Northeastern UniversityShenyang 110819China Ruipu Technology Group Co. Ltd.Qingtian 323903China

The effect of three heat processes with different calcium contents on the evolution of inclusions during the ladle furnace refining process of AISI 321 stainless steel was *** size,morphology,and composition of the inclusions were analyzed by scanning electron microscopy and energy-dispersive X-ray *** the addition of aluminum and titanium,the primary oxide in the AISI 321 stainless steel was an AbOs—MgO—TiOx complex oxide,in which the mass ratio of AbOs/MgO was highly consistent with spinel(MgO・AbO3).After calcium treatment,the calcium content in the oxide increased *** calculations show that when the Ti content was 0.2wt%,the Al and Ca contents were less than 0.10wt%and 0.0005wt%,respectively,which was beneficial for the formation of liquid inclusions in molten ***,the modification mechanism of calcium on TiN-wrapped oxides in combination with temperature changes was discussed.

关键词： inclusions stainless steel calcium treatment thermodynamic calculation

Estimating the power spectrum of a discrete cosmic momentum field with fast Fourier transform

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Research in Astronomy and Astrophysics 2020年第9期20卷 253-267页

作者： jun pan National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

Fast Fourier transform based estimators are formulated for measuring momentum power spectra,including the auto power spectra of the momentum,the momentum divergence,and the cross spectrum of density fluctuation and momentum *** using the third order Bettle-Lemariéscaling function to assign discrete objects to regular grids for fast Fourier transform are proposed to clean alias *** experiments prove that the implementation can achieve sub-percent precision till close to the Nyquist *** impact of removing bulk flow on the estimation of momentum power spectra is derived theoretically and verified *** bulk flow has little effects at large scales but might induce meaningful differences in nonlinear regime,and probably it is not necessary to subtract bulk flow for samples which peculiar velocities are exact or sufficiently *** power spectra of dark matter samples from N-body simulation are measured and *** expected,the prediction of the one loop Eulerian perturbation theory agrees with simulation only slightly better than the linear theory at z=0,but can be applied to higher redshift with improved *** of simulation data and the one loop Eulerian theory both reveal that the momentum field contains strong rotational part,and there is a large stochastic component in the divergence of momentum which is not correlated with the density *** three kinds of momentum power spectra have their own characteristics.

关键词： large scale structure of Universe cosmology:theory methods:numerical methods:statistical

Prognostic significance of the pre-chemotherapy lymphocyte-to-monocyte ratio in patients with previously untreated metastatic colorectal cancer receiving FOLFOX chemotherapy

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Chinese Journal of Cancer 2016年第3期35卷 142-150页

作者： Gui-Nan Lin pan-pan Liu Dong-Ying Liu Jie-Wen Peng jian-jun Xiao Zhong-jun Xia Department of Medical Oncology Zhongshan City People's Hospital/Zhongshan Hospital of Sun Yat-sen University Department of Medical Oncology Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer Medicine Department of Clinical Oncology Jiangmen City Central Hospital/Jiangmen Hospital of Sun Yat-sen University Department of Hematologic Oncology Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer Medicine

Background:As a surrogate marker of systemic inflammation,the lymphocyte-to-monocyte ratio(LMR) is an independent prognostic factor for various *** study investigated the prognostic significance of the pre-chemotherapy LMR in patients with previously untreated metastatic colorectal cancer(mCRC) receiving ***:The present study included newly diagnosed mCRC patients treated between January 2005 and December 2013 with FOLFOX chemotherapy,specifically oxaliplatin 180 mg/m^2 on day 1,with leucovorin 400 mg/m^2administered as a 2-hour infusion before the administration of 5-fluorouracil 400 mg/m^2 as an intravenous bolus injection,and 5-fluorouracil 2400 mg/m^2 as a 46-h infusion immediately after 5-fluorouracil bolus *** LMR was calculated as the absolute count of lymphocytes divided by the absolute count of *** proportional hazards analysis was performed to evaluate the association of LMR with survival ***:A total of 488 patients were *** with high pre-chemotherapy LMR experienced significant improvements in progression-free survival(PFS,9.2 vs.7.6 months,P 3.11) was an independent favorable prognostic factor for PFS and ***,patients whose LMR remained high(high-high subgroup),increased(low-high subgroup),or decreased(high-low subgroup) following chemotherapy showed better results in terms of PFS and OS than patients whose LMR remained low(low-low subgroup) after ***:For patients with previously untreated mCRC receiving FOLFOX chemotherapy,an elevated pre-chemotherapy LMR is an independent favorable prognostic factor for PFS and OS,and changes in the LMR before and after chemotherapy seem to predict the benefit of chemotherapy.

关键词： Metastatic colorectal cancer, Inflammation, Lymphocyte, Monocyte, Prognosis

Utilization of High Sulfur Raw Materials in Iron Ore Pellets

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Journal of Iron and Steel Research International 2013年第10期20卷 32-38页

作者： ZHU De-qing RUAN Zhi-yong CHUN Tie-jun pan jian School of Minerals Processing and Bioengineering Central South University Liuzhou Iron and Steel Group

Pyrite cinder and high sulfur magnetite were used as raw materials to produce iron ore pellets. Good quali ties of green balls and fired pellets were obtained from the feed comprising 50G pyrite cinder and 50% high sulfur magnetite concentrate at a small scale. Small scale tests were proven by pilot-scale tests. The high grade fired pel lets, assaying 63. 22% Fe, were analyzed, and the compressive strength of fired pellets was over 2 500 N/pellet. The fired pellets possessed excellent metallurgical performances, such as reducibility index higher than 67%, reduction swelling index lower than 15% and low temperature reduction degradation index （＋ 3.15 mm） higher than 1%, which can be used as the hurden for blast furnace.

关键词： pyrite cinder high sulfur magnetite iron ore pellet metallurgical performance

Upgrading and dephosphorization of Western Australian iron ore using reduction roasting by adding sodium carbonate

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International Journal of Minerals,Metallurgy and Materials 2013年第6期20卷 505-513页

作者： De-qing Zhu Tie-jun Chun jian pan Li-ming Lu Zhen He School of Minerals Processing and Bioengineering Central South University Commonwealth Scientific and Industrial Research Organisation (CSIRO)

The technology of direct reduction by adding sodium carbonate （Na2CO3） and magnetic separation was developed to treat Western Australian high phosphorus iron ore. The iron ore and reduced product were investigated by optical microscopy and scanning electron microscopy. It is found that phosphorus exists within limonite in the form of solid solution, which cannot be removed through traditional ways. During reduction roasting, Na2CO3 reacts with gangue minerals （SiO2 and A1203）, forming aluminum silicate-containing phosphorus and damaging the ore structure, which promotes the separation between iron and phosphorus during magnetic separation. Meanwhile, Na2CO3 also improves the growth of iron grains, increasing the iron grade and iron recovery. The iron concentrate, assaying 94.12wt% Fe and 0.07wt% P at the iron recovery of 96.83% and the dephosphorization rate of 74.08%, is obtained under the optimum conditions. The final product （metal iron powder） after briquetting can be used as the burden for steelmaking by an alactrie *** furnace to rer）la,ce scrar） steel.

关键词： iron ore reduction sodium carbonate ore roasting magnetic separation phosphorus removal

Evaluation of hydraulic fracturing of horizontal wells in tight reservoirs based on the deep neural network with physical constraints

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Petroleum Science 2023年第2期20卷 1129-1141页

作者： Hong-Yan Qu jian-Long Zhang Fu-jian Zhou Yan Peng Zhe-jun pan Xin-Yao Wu State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China School of Artificial Intelligence China University of PetroleumBeijing102249China Unconventional Oil and Gas Institute China University of PetroleumBeijing102249China School of Petroleum Engineering China University of PetroleumBeijing102249China Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Ministry of EducationNortheast Petroleum UniversityDaqingHeilongjiang163318China Engineering Technology Research Institute PetroChina Xinjiang Oilfield CompanyKaramayXinjiang834000China

Accurate diagnosis of fracture geometry and conductivity is of great challenge due to the complex morphology of volumetric fracture network. In this study, a DNN (deep neural network) model was proposed to predict fracture parameters for the evaluation of the fracturing effects. Field experience and the law of fracture volume conservation were incorporated as physical constraints to improve the prediction accuracy due to small amount of data. A combined neural network was adopted to input both static geological and dynamic fracturing data. The structure of the DNN was optimized and the model was validated through k-fold cross-validation. Results indicate that this DNN model is capable of predicting the fracture parameters accurately with a low relative error of under 10% and good generalization ability. The adoptions of the combined neural network, physical constraints, and k-fold cross-validation improve the model performance. Specifically, the root-mean-square error (RMSE) of the model decreases by 71.9% and 56% respectively with the combined neural network as the input model and the consideration of physical constraints. The mean square error (MRE) of fracture parameters reduces by 75% because the k-fold cross-validation improves the rationality of data set dividing. The model based on the DNN with physical constraints proposed in this study provides foundations for the optimization of fracturing design and improves the efficiency of fracture diagnosis in tight oil and gas reservoirs.

关键词： Evaluation of fracturing effects Tight reservoirs Physical constraints Deep neural network Horizontal wells Combined neural network

The Security Analysis of Quantum SAGR04 Protocol in Collective-Rotation Noise Channel

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Chinese Journal of Electronics 2015年第4期24卷 689-693页

作者： LI jian pan Zeshi ZHENG jun SUN Fengqi YE Xinxin YUAN Kaiguo School of Computer Beijing University of Posts and Telecommunications Science and Technology on Communication Security Laboratory School of Computer Beijing institute of Technology

Noise exists in the actual communication environment. It is necessary and significant to analyze the security of SAGR04 protocol in the noise environment. An excellent model of collective rotation noise analysis is introduced and the discussing of the security of SAGR04 protocol is based on the method of information theory. The eavesdropping can be detected for the increment of the qubit error rate and eavesdropper can maximally get about50% of the keys. It can be concluded that the SAGR04 protocol, used as quantum key distribution, is secure.

关键词： SAGR04 Collective rotation noise Qubit error rate Average mutual information

Strontium ferrite powders prepared from oily cold rolling mill sludge by solid-state reaction method

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Rare Metals 2013年第5期32卷 518-523页

作者： Bo Liu Shen-Gen Zang jian-jun Tian De-an pan Hang-Xin Zhu Advanced Material and Technology Institute University ofScience and Technology Beijing

Oily cold rolling mill （CRM） sludge is one of the pollutants emitted by iron and steel plants. Recycling oily CRM sludge can not only reduce pollution but also bring social and environmental benefits. In this study, using oily CRM sludge as sources of iron oxide, the strontium ferrite powders were synthesized in multiple steps including vacuum distillation, magnetic separation, oxidizing roasting, and solidstate reaction. The optimal technological conditions of vacuum distillation and oxidizing roasting were studied carefully. To consider the effects of Fe203/ SrCO3 tool ratio, calcination temperature, milling time and calcination time on magnetic properties of prepared strontium ferrite powders, the orthogonal experimental method was adopted. The maximum saturation magneti- zation （62.6 mA-m2.g-1） of the synthesized strontium ferrite powders was achieved at the Fe203/SrCO3 mol ratio of 6, 5 h milling time, 1250 ~C calcination temperature, and 1 h calcination time. Strontium ferrite powders syn- thesis method not only provides a cheap, high quality raw material for the production of strontium ferrite powders, but also effectively prevents the environmental pollution.

关键词： Strontium ferrite powders Oily cold rolling mill sludge Solid-state reaction method Recycling

Biomimetic high-flux proton pump constructed with asymmetric polymeric carbon nitride membrane

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Nano Research 2023年第1期16卷 18-24页

作者： Yizhu Zhang Shangfa pan Yuanyuan Zhang Shaoqiang Su Xia Zhang jian Liu jun Gao College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China Shandong Energy Institute Qingdao 266101China Physics of complex fluids University of TwenteEnschede 7522 NBthe Netherlands

Biological proton pumps ferry protons in an active manner and have a high flux(a few to 10 protons/(s·nm^(2))).Integrating these features in an artificial membrane may open the way for a wide range of applications but it remains *** this work,we employed a structural engineering strategy to construct an asymmetric photonic polymeric carbon nitride(C3N4)membrane that exhibited photo-driven high flux proton pumping *** ion transport path through the membrane is reminiscent of that in the high-flux asymmetric biological ion *** addition,it has a photonic structure that mimics the mosquito compound eyes with improved light ***,the asymmetric structure constitutes an isotype(n-n)heterojunction that enhances the separation of the light-induced electron-hole *** a result,the membrane shows a flux of 89μA/cm^(2)under 100 mW/cm^(2)white light illumination(approximately one sun),the highest ever *** translates to a pumping rate of~6 proton/(s·nm^(2)),comparable to the biological *** work highlights the potential of multi-level structural engineering to construct high-performance bionic devices,and may find applications in solar energy harvesting and solar powered membrane process.

关键词： polymeric carbon nitride membrane ion selectivity proton pump light harvesting