检索结果-南通市图书馆

Journal of Iron and Steel Research(International) 2022年第11期29卷 1823-1835页

作者： Hao-chi Xu Cheng-bin shi Xin Zhu shi-jun wang Jing Li shi-zhou wang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing(USTB)Beijing 100083China

The microstructure,eutectic carbides and intermetallic compounds in as-cast ingots with varying Nb contents produced by electroslag remelting were studied.The solidification behavior,microsegregation of alloying elements and its influence on precipitates were analyzed.The increase in Nb content from 0.64 to 1.40 wt.%has no effect on the dendrite morphology and secondary dendrite arm spacing.The total area fraction of eutectic NbC and Laves phase in as-cast ingots increases with the increase in Nb content.The eutectic precipitates in the ingot with 0.64 wt.%Nb are mainly NbC,and the others are Fe_(2)Nb-type Laves phase.Increasing the Nb content of the steel significantly promotes the precipitation of Laves phases and lowers the precipitation temperature of NbC eutectic carbides.Eutectic carbide M_(2)C is precipitated only in the ingot with 1.4 wt.%Nb.The average concentration of Nb in both interdendritic and intragranular regions increases with the increase in Nb content of the steel,leading to a change in the morphology of Fe_(2)Nb-type Laves phase from honeycomb to blocky.Increasing the Nb content exerts little effect on the microsegregation degrees of Si,Mo,Cr and Ni in the steel.

关键词： Eutectic carbides Fe2Nb-type Laves phase Austenitic heat-resistant steel Microsegregation Electroslag remelting

Effect of cerium on microstructure,eutectic carbides and Laves phase in electroslag remelted 15Cr-22Ni-1Nb austenitic heat-resistant steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2023年第2期30卷 338-349页

作者： Xin Zhu Cheng-bin shi shi-jun wang Peng Lan Jing Li State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing(USTB)Beijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

The dendrites,eutectic carbides,Laves phase and microsegregation of alloying element in electroslag remelted 15Cr-22Ni-1Nb austenitic heat-resistant steel with varying cerium contents were studied.The liquidus and solidus temperatures of the steel were determined to reveal the effect of cerium on solidification temperature interval and local solidification time of the steel.The secondary dendrite arm spacing decreases from 57.10 to 40.18μm with increasing the cerium content from 0 to 0.0630 wt.%.The eutectic NbC and Laves phase in as-cast ingots exhibit blocky and honeycomb morphology,respectively.The area fractions and sizes of eutectic NbC and Laves phase in as-cast ingots decrease with the increase in cerium content.The atomic percentage of Laves phase-forming element(Ni,Nb,Cr,Mo and Si)decreases with the increase in cerium content of the steel.The microsegregation of Mo,Ni,Si,Cr and Nb decreases with increasing the cerium content,which is favorable to reducing both the amount and sizes of eutectic NbC and Laves phase in as-cast ingots.The solidification temperature interval and local solidification time of the steel decrease as the cerium content is increased from 0 to 0.0630 wt.%,which inhibits the growth of dendrites,eutectic NbC and Laves phase.

关键词： Heat-resistant steel Rare earth cerium Eutectic NbC Laves phase Microsegregation Solidification characteristics

Radiological and clinical outcomes of midline lumbar fusion on sagittal lumbar-pelvic parameters for degenerative lumbar diseases

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 2022年第35期10卷 12880-12889页

作者： Yue-Tian wang Bing-Xu Li shi-jun wang Chun-De Li Hao-Lin Sun Department of Orthopedics Peking University First HospitalBeijing 100034China

BACKGROUND Improving the sagittal lumbar-pelvic parameters after fusion surgery is important for improving clinical outcomes.The impact of midline lumbar fusion(MIDLF)on sagittal lumbar-pelvic alignment for the management of degenerative lumbar diseases is still unknown.AIM To analyze the effects of short-segment MIDLF and minimally invasive transforaminal lumbar interbody fusion(MIS-TLIF)on sagittal lumbar-pelvic parameters.METHODS We retrospectively analyzed 63 patients with degenerative lumbar diseases who underwent single-segment MIDLF or MIS-TLIF.The imaging data of patients were collected before surgery and at the final follow-up.The radiological sagittal parameters included the lumbar lordosis(LL),lower LL,L4 slope(L4S),L5 slope(L5S),L5 incidence(L5I),L1 axis and S1 distance(LASD),pelvic incidence(PI),pelvic tilt(PT),sacral slope(SS),and PI-LL mismatch(PI-LL).Additionally,the clinical outcomes,including lower back and leg pain visual analog scale(VAS)and Oswestry disability index(ODI)scores,were also analyzed.RESULTS In both groups,LL and Lower LL significantly increased,while L5I and LASD significantly decreased at the final follow-up compared to that recorded prior to operation(P0.05).However,the PI-LL in both groups was significantly reduced compared to that recorded prior to operation(P0.05).In addition,the change in sagittal lumbar-pelvic parameters did not differ significantly,except forΔLASD within the two groups(P>0.05).The mean lower back and

关键词： Minimally invasive Interbody fusion Cortical bone trajectory Sagittal lumbar-pelvic parameters

Administration of modified Gegen Qinlian decoction for hemorrhagic chronic radiation proctitis: A case report and review of literature

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 2023年第5期11卷 1129-1136页

作者： Shao-Yong Liu Liu-Ling Hu shi-jun wang Zhong-Li Liao Traditional Chinese Medicine Cancer Treatment Center Chongqing University Cancer HospitalChongqing 400030China The Center for Gastroenterology Diagnosis and Minimally Invasive Treatment of Early Gastrointestinal CancerChongqing University Cancer HospitalChongqing 400030China

BACKGROUND Hemorrhagic chronic radiation proctitis(CRP) is a common late complication of irradiation of the pelvis and seriously impairs life quality. There is no standard treatment for hemorrhagic CRP. Medical treatment, interventional treatment, and surgery are available, but they are limited in their applications due to nondefinite efficacy or side effects. Chinese herbal medicine(CHM), as a complementary or alternative therapy, may provide another option for hemorrhagic CRP treatment.CASE SUMMARY A 51-year-old woman with cervical cancer received intensity-modulated radiation therapy and brachytherapy with a total dose of 93 Gy fifteen days after hysterectomy and bilateral adnexectomy. She received six additional cycles of chemotherapy with carboplatin and paclitaxel. Nine months after radiotherapy treatment, she mainly complained of 5-6 times diarrhea daily and bloody purulent stools for over 10 d. After colonoscopy examinations, she was diagnosed with hemorrhagic CRP with a giant ulcer. After assessment, she received CHM treatment. The specific regimen was 150 mL of modified Gegen Qinlian decoction(GQD) used as a retention enema for 1 mo, followed by replacement with oral administration of 150 mL of modified GQD three times per day for 5 mo. After the whole treatment, her diarrhea reduced to 1-2 times a day. Her rectal tenesmus and mild pain in lower abdomen disappeared. Both colonoscopy and magnetic resonance imaging confirmed its significant improvement. During treatment,there were no side effects, such as liver and renal function damage.CONCLUSION Modified GQD may be another effective and safe option for hemorrhagic CRP patients with giant ulcers.

关键词： Hemorrhagic chronic radiation proctitis Chinese herbal medicine Gegen Qinlian decoction Retention enema Case report

Non-metallic inclusions in electroslag remelting:a review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2021年第12期28卷 1483-1503页

作者： Cheng-bin shi shi-jun wang Jing Li jung-wook Cho Institute of Advanced Steel State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology Beijing(USTB)Beijing100083China Graduate Institute of Ferrous and Energy Materials Technology Pohang University of Science and Technology(POSTECH)Pohang790-784Republic of Korea

Non-metallic inclusion in electroslag remelting is a constant topic that has been studied for decades.Different results and conclusions are obtained on some of the subjects from these previous investigations.These differences originate in part from different experimental conditions,including original inclusion chemistries in consumable electrode,slag composition,oxygen level,liquid metal compositions,deoxidation schemes,and melting rates of electroslag remelting.The advances in the operating practices of inclusion control in electroslag remelting production are reviewed.Inclusion evolution during the electroslag remelting and related processing parameters are also reviewed and assessed.The role of the reoxidation of liquid steel during electroslag remelting on oxide inclusion composition is discussed.The generation of inclusions in remelted ingot is critically assessed.Perspective and remaining issues are noted.

关键词： Non-metallic inclusion Electroslag remelting Inclusion removal Reoxidation

New Species of the Isolated Psaroniaceous Rachis from the Early Permian in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2008年第1期50卷 119-127页

作者： Ning Xiang shi-Min Ma Bao-Lin Tian shi-jun wang Ming-Shan Zhang State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany the Chinese Academy of Sciences Beijing 100093 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China China University of Mining and Technology Beijing 100083 China 107th Team Northeast Coal Geology Bureau Fuxin 123000 China

A new kind of marattialean raches are reported from the coal balls in Coal Seam No.7 in the upper part of the Taiyuan Formation （early Early Permian） from Taiyuan, Shanxi, China and are assigned to the genus Stipitopteris Grand＇Eury （Psaroniaceae）. The present specimens are different from all six reported species of the genus, and are therefore proposed as a new species： Stipitopteris shanxiensis. The raches of the new species are generally dorsi-ventrally flattened. The main raches usually exhibit scales of different forms on their surface. Beneath the epidermis is a zone of parenchymatous cells, some of which contain tannin-like contents. Inside this is a zone of small sclerenchymatous cells. Inward are the ground tissue and vascular bundles. The vascular bundles are continuous and are in two circles： the outer circle assumes a transversely elliptical shape with the gap and pinna trace, and the inner circle assumes a shallow C.shape with inrolled ends. The ground tissue located at the inner side of the vascular bundle is composed of thicker-walled parenchymatous cells. The cells of the ground tissue are vertically elongated in longitudinal sections. Subordered raches are smaller and have simpler structures than the main raches. The parenchyma zone beneath the epidermis is thinner, usually one to two cells wide and the sclerenchyma zone is usually absent. The scales are poorly developed and there is only one C-shaped vascular bundle. The new species is comparable to the crosiers of Psaroniaceae of the Euramerican Flora in some aspects, for example, it has a dorsi-ventrally flattened rachis and scales on the surface of the rachis. However, the other features and the preservative conditions of the present specimens indicate that they are not crosiers, but fully developed or mature raches. The new species is the first well-studied anatomically-preserved rachis of Psaroniaceae from the Cathaysian Flora and bears significance not only in understanding the anatomy and taxonomy of Psaroniaceae in the Cathaysian Flora,

关键词： coal ball Early Permian new species Psaroniaceae rachis Stipitopteris.

Neoadjuvant chemotherapy for locally advanced cervical cancer reduces surgical risks and lymph-vascular space involvement

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2011年第9期30卷 645-654页

作者： Yue wang Guang wang Li-Hui Wei Ling-Hui Huang Jian-Liu wang shi-jun wang Xiao-Ping Li Dan-Hua Shen Dong-Mei Bao Jian Gao Department of Obstetrics ＆ Gynecology People＇s Hospital Peking University Beijing 100044 P. R. China Department of Obstetrics ＆ Gynecology Hangu Hospital Tianjin 300480 P. R. China Department of Obstetrics ＆ Gynecology Jinghong Municipal Hospital Jinghong Yunnan 666100 P. R. China Department of Pathology People＇s Hospital Peking University Beijing 100044 P. R. China Department of Radiology People＇s Hospital Peking University Beijing 100044. p. R. China.

Neoadjuvant chemotherapy(NACT),which can reduce the size and therefore increase the resectability of tumors,has recently evolved as a treatment for locally advanced cervical cancer.NACT has been reported to decrease the risk of pathologic factors related to prognosis of cervical cancer.To further assess the effects of NACT on surgery and the pathologic characteristics of cervical cancer,we reviewed 110 cases of locally advanced cervical cancer treated with radical hysterectomy with or without NACT at the People's Hospital of Peking University between January 2006 and December 2010.Of 110 patients,68 underwent platinum-based NACT prior to surgery(NACT group) and 42 underwent primary surgery treatment(PST group).Our results showed 48 of 68(70.6%) patients achieved a complete response or partial response to NACT.Estimated blood loss,operation time,and number of removed lymph nodes during surgery,as well as complication rates during and after surgery were not significantly different between the NACT group and the PST group.The rates of deep stromal invasion,positive parametria,positive surgical vaginal margins,and lymph node metastasis were not significantly different between the two groups.However,the rate of lymph-vascular space involvement(LVSI) was significantly lower in the NACT group than in the PST group(P = 0.021).In addition,the response rate of NACT was significantly higher in the patients with chemotherapeutic drugs administrated via artery than via vein.Our results suggest that NACT is a safe and effective treatment for locally advanced cervical cancer and significantly decreases the rate of LVSI.

关键词：手术治疗子宫颈癌化疗药物淋巴结晚期间隙血管风险

六个花椒栽培种挥发油组分的特征性差异及生物学意义（英文）

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) 2017年第10期18卷 917-920页

作者： Shu-ming LIU shi-jun wang Si-yao SONG Yong ZOU jun-ru wang Bing-yin SUN College of Science Northwest A&F UniversityYangling 712100China Shaanxi Key Laboratory of Natural Products&Chemical Biology College of Chemistry and Pharmaceutical SciencesNorthwest-4&F UniversityYangling 712100China Department of Environmental Engineering Yangling Vocational and Technical CollegeYangling 712100China

从花椒人工引种栽培出发,通过气相色谱法-质谱法联用法(GC-MS)分析了6个不同花椒栽培种的挥发油组分,据此进行了聚类分析,研究结果如下。(1)占挥发油99.07%~99.78%的71种化合物得以鉴定,其中29种为6个栽培种共有。(2)聚类分析将6个品种... 详细信息

从花椒人工引种栽培出发,通过气相色谱法-质谱法联用法(GC-MS)分析了6个不同花椒栽培种的挥发油组分,据此进行了聚类分析,研究结果如下。(1)占挥发油99.07%~99.78%的71种化合物得以鉴定,其中29种为6个栽培种共有。(2)聚类分析将6个品种分为3类:Dahongpao A^C(Ⅱ~Ⅳ)与shizitou(Ⅵ)聚为一类,因为有6个主化合物相同,为β-月桂烯、(E)/(Z)-β-罗勒烯、枞油烯、桉树脑和4-羟基松油醇,占挥发油的53.46%~70.42%;Qin’an(Ⅰ)单独一类,因为其α-柠檬烯占挥发油的60.53%;Meifengjiao(Ⅴ)也单独成类,其主成分和其他品种均不同,含21.17%β-芳樟醇和20.80%乙酸芳樟酯,而其他品种的这些成分却低于3%。(3)Dahongpao B/C、Qin’an和Meifengjiao分别具有良好的抗肿瘤、抗真菌、抗细菌及杀虫潜力。

关键词：花椒栽培种挥发油组成特征性差异气相色谱法-质谱法联用法(GC-MS) 聚类分析

The behavior of cesium adsorption on zirconyl pyrophosphate

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第3期27卷 74-79页

作者： feng-li song xiao-wei yang xiao-long li wei he dan lü ji que chun-long zhang shan-gui zhao shi-jun wang yun-tao liu Nuclear and Radiation Safety Center Ministry of Environmental ProtectionBeijing 100082China

Zirconyl pyrophosphate(ZrP_2O_7) was prepared and Cs adsorption behavior was studied.Results show that the distribution coefficient of Cs adsorption on ZrP_2O_7 was about 2800 mL/g.Ion exchange capacity of ZrP_2O_7 was0.35 mmol/g.In dynamic tests,Cs can be separated from other fission products very well by ZrP_2O_7.The ZrP_2O_7was stable both at high temperatures and in high concentration of nitric acid.The Cs adsorption by ZrP_2O_7 is a monolayer and chemical adsorption.

关键词：吸附行为磷酸锆铯动态测试分布系数交换能力裂变产物化学吸附

Role of LAP^+CD4^+ T cells in the tumor microenvironment of colorectal cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第3期23卷 455-463页

作者： Wu Zhong Zhi-Yuan Jiang Lei Zhang Jia-Hao Huang shi-jun wang Cun Liao Bin Cai Li-Sheng Chen Sen Zhang Yun Guo Yun-Fei Cao Feng Gao Department of Gastrointestinal Surgery Ganzhou Hospital of Nanchang University Department of Anorectal Surgery Minzu Hospital of Guangxi Zhuang Autonomous Region Department of Colorectal and Anal Surgery First Affiliated Hospital of Guangxi Medical University

AIM To investigate the abundance and potential functions of LAP^+CD4^+ T cells in colorectal cancer(CRC). METHODS Proportions of LAP^+CD4^+ T cells were examined in peripheral blood and tumor/paratumor tissues of CRC patients and healthy controls using flow cytometry. Expression of phenotypic markers such as forkhead box(Fox)p3, cytotoxic T-lymphocyte-associated protein(CTLA)-4, chemokine CC receptor (CCR)4 and CCR5 was measured using flow cytometry. LAP^-CD4^+ and LAP^+CD4^+ T cells were isolated using a magnetic cellsorting system and cell purity was analyzed by flow cytometry. Real-time quantitative polymerase chain reaction was used to measure expression of cytokines interleukin (IL)-10 and transforming growth factor(TGF)-β.RESULTS The proportion of LAP^+CD4^+ T cells was significantly higher in peripheral blood from patients (9.44% ± 3.18%) than healthy controls (1.49% ± 1.00%, P < 0.001). Among patients, the proportion of LAP^+CD4^+ T cells was significantly higher in tumor tissues(11.76% ± 3.74%) compared with paratumor tissues (3.87% ± 1.64%, P < 0.001). We also observed positive correlations between the proportion of LAP^+CD4^+ T cells and TNM stage(P < 0.001), distant metastasis(P < 0.001) and serum level of carcinoembryonic antigen(P < 0.05). Magnetic-activated cell sorting gave an overall enrichment of LAP^+CD4^+ T cells (95.02% ± 2.87%), which was similar for LAP^-CD4^+ T cells(94.75% ± 2.76%). In contrast to LAP^-CD4^+ T cells, LAP^+CD4^+ T cells showed lower Foxp3 expression but significantly higher levels of CTLA-4, CCR4 and CCR5(P < 0.01). LAP^+CD4^+ T cells expressed significantly larger amounts of IL-10 and TGF-β but lower levels of IL-2, IL-4, IL-17 and interferon-γ, compared with LAPCD4+ T cells.CONCLUSION LAP^+CD4^+ T cells accumulated in the tumor microenvironment of CRC patients and were involved in immune evasion mediated by IL-10 and TGF-β.

关键词： LAP^+CD4^+ T cells Colorectal cancer Tumor microenvironment Interleukin-10 Transforming growth factor-β