检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

有限域上完全对称多项式零点的新下界

数学学报（中文版） 2024年第2期67卷 211-219页

作者：万大庆张俊美国加州大学尔湾分校数学系尔湾CA 92697 首都师范大学数学科学学院北京100048

有限域上多项式的零点计数问题是算术代数几何的核心问题之一,本文考虑有限域Fq上完全对称多项式的零点问题.主要结果如下:设h(x1,…,xk)是有限域Fq上一个m次完全对称多项式(k≥3,1≤m≤q-2):(1)若q为奇数,则h(x1,…,xk)在Fqk中至少有[(... 详细信息

有限域上多项式的零点计数问题是算术代数几何的核心问题之一,本文考虑有限域Fq上完全对称多项式的零点问题.主要结果如下:设h(x1,…,xk)是有限域Fq上一个m次完全对称多项式(k≥3,1≤m≤q-2):(1)若q为奇数,则h(x1,…,xk)在Fqk中至少有[(q-1)/(m+1)]/(q-[(q-1)/(m+1)])(q-m-1)q^(k-2)个零点;(2)若q为偶数,且k≥4,则h(x1,…,xk)在Fqk中至少有[(q-1)/(m+1)]/(q-[(q-1)/(m+1)])(q-(m+1)/2)(q-1)q^(k-3)个零点.注意到,当m比较小的时候,上述新的下界改进了已有下界[4,定理1.4]和[3,定理1.2](见本文结论1.1和1.2)大约q2/6m倍.

关键词：完全对称多项式零点有限域

Andrographolide Attenuates Noise-Induced Hearing Loss by Ameliorating Cochlear Inflammation

在线全文

学校读者我要写书评

暂无评论

World Journal of Traditional Chinese medicine 2024年第2期10卷 204-212页

作者： meng-Hua Li wan-Qi wang Li-Ting Zheng meng Bing Chen Yang Chu miao Qiao Zuo-Li Zhang Konduru Naveena Yong Pan Yun-Shi Zhang He Sun Xiao-Hui ma Xi Shi Artificial Auditory Laboratory of Jiangsu Province Xuzhou Medical UniversityXuzhouChina Key Laboratory of Tropical Biological Resources of ministry of Education School of Pharmaceutical SciencesHainan UniversityHaikouChina Department of ENT Beijing Friendship HospitalCapital Medical UniversityBeijingChina National Key Laboratory of Chinese medicine modernization Tasly AcademyTasly Pharmaceutical Group Co.Ltd.TianjinChina Endoscopy Center Ankang People's HospitalAnkangChina Department of Respiratory medicine Xuzhou Infectious Diseases HospitalAffiliated Hospital of Xuzhou Medical UniversityXuzhouChina Department of ENT The People's Hospital of Rongchang DistrictChongqingChina

Objective:This study aimed to explore andrographolide's mechanism of action and its protective effect on noise-induced hearing loss(NIHL).materials and methods:A mice animal model for NIHL was established through exposure to broadband noise at 120 d B sound pressure level for 4 *** analysis and pharmacodynamic experiments were carried ***:Andrographolide enters the inner ear and effectively prevents hearing damage following noise exposure in the mice model for permanent hearing ***,treatment with andrographolide inhibited the excessive activation of inflammatory factors in the cochleae of noise-exposed ***:Andrographolide might be a promising candidate for auditory protective drug investigation.

关键词： Andrographolide anti-inflammatory auditory protection noise-induced hearing loss traditional Chinese medicine compound

基于偏最小二乘回归法分析陈醋理化指标和品质

在线全文

学校读者我要写书评

暂无评论

中国调味品 2024年第5期49卷 161-165页

作者：李婉常亮南阳农业职业学院河南南阳473000 郑州大学郑州450001

以南阳市大型商超市售的3种陈醋为研究对象,参考国家标准检测方法对陈醋的总酸含量、不挥发性酸含量及pH值进行对比分析;以近红外光谱技术结合偏最小二乘回归定量分析法,确定最佳进光光程、最优流量及最佳预处理方式,并在此条件下对3种... 详细信息

以南阳市大型商超市售的3种陈醋为研究对象,参考国家标准检测方法对陈醋的总酸含量、不挥发性酸含量及pH值进行对比分析;以近红外光谱技术结合偏最小二乘回归定量分析法,确定最佳进光光程、最优流量及最佳预处理方式,并在此条件下对3种陈醋进行判别分析,从而确定基于偏最小二乘回归法分析陈醋理化指标的方法。结果显示,3种陈醋样品均符合国家标准规定的陈醋pH值(pH 3.6~3.9),3种陈醋样品的pH值分别为3.71±0.02,3.65±0.01和3.82±0.01;3种陈醋样品中总酸和不挥发性酸含量略有不同,分别在(0.567±0.011)~(0.593±0.02)g/L和(0.148±0.012)~(0.215±0.018)g/L。在进行近红外光谱检测中,在最佳光程选择上,去掉异常样品后pH值检测和不挥发性酸检测的最佳光程为3 mm,总酸检测的最佳光程为2 mm;在陈醋流量选择上,pH值检测和总酸检测应控制流量为0.2 L/min,不挥发酸检测应控制流量为0.6 L/min;在光谱预处理条件选择上,pH值检测和不挥发性酸检测应选择SNV预处理方式,而总酸检测应选择5点平滑预处理。结果表明,利用近红外光谱结合偏最小二乘回归法可以进行陈醋理化性质的检测,其检测效果良好、检测效率高。

关键词：陈醋偏最小二乘回归法理化指标

基于先验约束和InSAR数据估计土耳其双震的同震破裂分布

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

地球科学 2024年第8期49卷 2961-2978页

作者：梅景涛万永革防灾科技学院河北三河065201 河北省地震动力学重点实验室河北三河065201 河北红山巨厚沉积与地震灾害国家野外科学观测研究站河北隆尧055350

2023年2月6日土耳其发生了两次震级大于7.0级的破坏性大地震.迄今为止,用不同观测资料得到的土耳其破裂模型仍存在较大的差异,其中美国地质调查局给出的有限断层模型是目前所能得到的最为准确的一个综合性模型,所以我们选择采用美国地... 详细信息

2023年2月6日土耳其发生了两次震级大于7.0级的破坏性大地震.迄今为止,用不同观测资料得到的土耳其破裂模型仍存在较大的差异,其中美国地质调查局给出的有限断层模型是目前所能得到的最为准确的一个综合性模型,所以我们选择采用美国地质调查局给出的有限断层模型作为本研究的先验模型,并结合哨兵一号获取的InSAR观测数据反演出土耳其双震的同震破裂分布,得到的结果如下:(1)反演得出的总地震矩为1.6268×1021N·m,相当于一次mw8.1级的大地震;(2)在东安纳托利亚主断层上的破裂多集中在地下0~15 km的范围内,东安纳托利亚北部分支断层?ardak-Sürgü断裂带上的破裂多集中在地下5~20 km范围内.在东安纳托利亚主断层中,破裂呈现为两个明显的高值区,一处位于Narlidag断裂带与东安纳托利亚主断层的交汇处,另一处位于Narlidag断裂带与东安纳托利亚主断层的交汇处往西南方向大约65 km的位置,其中破裂的最大走滑分量可达到9.0 m,最大的倾滑分量约为3.0 m;在?ardak-Sürgü断裂带中,总体形态表现为两个高值区,一个位于7.5级土耳其地震的震中附近,一个则是位于?ardak-Sürgü断层西北角东南—西北走向与东北—西南走向断层的交汇处,其中走滑分量的最大值约为8.1 m,倾滑分量的最值约为6.1 m.土耳其双震产生的破裂以走滑分量为主,倾滑分量为辅,且两个发震断层东安纳托利亚主断层和?ardak-Sürgü断裂带总体都呈现为左旋走滑性质,但在局部范围内也呈现出明显的逆冲性质与正断性质.

关键词：同震破裂模型 InSAR测量数据先验信息土耳其双震地震学

基于5 μm厚向列相液晶的高效圆极化相控阵系统的设计、校准和实验验证

在线全文

学校读者我要写书评

暂无评论

Engineering 2024年第1期32卷 69-81页

作者： Xin Yu Wu Fengshuo wan Hongyuan Feng Shichao Jin Chong Guo Yu Wei Dunge Liu Yuqian Yang Longzhu Cai Zhi Hao Jiang Wei Hong State Key Laboratory of millimeter Waves School ofInformation Science and Engineering Southeast UniversityNanjing 210096China State Key Laboratory of Space-Ground Integrated Information Technology Beijing Institute of Satellite Information Engineering Beijing 100095China Research Institute of millimeter-Wave and Terahertz Technology(RImmATT) Nanjing 211111China

This paper presents a systematic investigation and demonstration of a K-band circularly polarized liquidcrystal-based phased array(LCPA),including the design,over-the-air(OTA)in-array calibration,and experimental *** LCPA contains 16 phase-shifting radiating channels,each consisting of a circularly polarized stacked patch antenna and a liquid-crystal-based phase shifter(LCPS)based on a loaded differential line *** to its slow-wave properties,the LCPS exhibits a maximum phase-shifting range of more than 360°with a figure of merit of 78.3(°)·dB^(-1)based on a liquid crystal layer with a thickness of only 5μ***,an automatic OTA calibration based on a state ergodic method is proposed,which enables the extraction of the phase-voltage curve of every individual LCPA *** proposed LCPA is manufactured and characterized with a total profile of only 1.76 mm,experimentally demonstrating a scanned circularly polarized beam from-40°to+40°with a measured peak gain of 12.5 dBic and a scanning loss of less than 2.5 *** bandwidth of the LCPA,which satisfies the require-ments of port reflection(|S_(11)|)m squintingm 25.5 to 26.0 *** total efficiency is about 34%,which represents a new state of the *** use of the demonstrated low-profile LCPA to support circularly polarized scanning beams,along with the systematic design and calibration methodology,holds potential promise for a variety of millimeter-wave applications.

关键词： Circularly polarized Liquid crystal Liquid-crystal based phased array(LCPA) Phase shifter Over-the-air(OTA)calibration

Reference-frame-independent quantum key distribution with two-way classical communication

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第10期33卷 146-152页

作者： Chun Zhou Hai-Tao wang Yi-Fei Lu Xiao-Lei Jiang Yan-mei Zhao Yu Zhou Yang wang Jia-Ji Li Yan-Yang Zhou Xiang wang Hong-Wei Li wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography SSF IEUZhengzhou 450001China

The data post-processing scheme based on two-way classical communication(TWCC)can improve the tolerable bit error rate and extend the maximal transmission distance when used in a quantum key distribution(QKD)*** this study,we apply the TWCC method to improve the performance of reference-frame-independent quantum key distribution(RFI-QKD),and analyze the influence of the TWCC method on the performance of decoy-state RFI-QKD in both asymptotic and non-asymptotic *** numerical simulation results show that the TWCC method is able to extend the maximal transmission distance from 175 km to 198 km and improve the tolerable bit error rate from 10.48%to 16.75%.At the same time,the performance of RFI-QKD in terms of the secret key rate and maximum transmission distance are still greatly improved when statistical fluctuations are *** conclude that RFI-QKD with the TWCC method is of practical interest.

关键词： quantum key distribution reference-frame-independent two-way classical communication

Programmed cell death 1 inhibitor sintilimab plus concurrent chemoradiotherapy for locally advanced pancreatic adenocarcinoma

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Oncology 2024年第7期15卷 859-866页

作者： Shi-Qiong Zhou Peng wan Sen Zhang Yuan Ren Hong-Tao Li Qing-Hua Ke Department of Chemoradiotherapy The First Affiliated Hospital of Yangtze UniversityJingzhou 434000Hubei ProvinceChina

BACKGROUND Pancreatic adenocarcinoma,a malignancy that arises in the cells of the pancreas,is a devastating disease with unclear etiology and often poor *** advanced pancreatic cancer,a stage where the tumor has grown significantly but has not yet spread to distant organs,presents unique challenges in *** article aims to discuss the current strategies,challenges,and future directions in the management of locally advanced pancreatic adenocarcinoma(LAPC).AIm To investigate the feasibility and efficacy of programmed cell death 1(PD-1)inhibitor sintilimab plus concurrent chemoradiotherapy for *** Eligible patients had LAPC,an Eastern cooperative oncology group performance status of 0 or 1,adequate organ and marrow functions,and no prior anticancer *** the observation group,participants received intravenous sintilimab 200 mg once every 3 wk,and received concurrent chemoradiotherapy(concurrent conventional fractionated radiotherapy with doses planning target volume 50.4 Gy and gross tumor volume 60 Gy in 28 fractions and oral S-140 mg/m2 twice daily on days 1-14 of a 21-d cycle and intravenous gemcitabine 1000 mg/m2 on days 1 and 8 of a 21-d cycle for eight cycles until disease progression,death,or unacceptable toxicity).In the control group,participants only received concurrent *** April 2020 to November 2021,64 participants were finally enrolled with 34 in the observation group and 30 in the control *** Thirty-four patients completed the scheduled course of chemoradiotherapy,while 32(94.1%)received sintilimab plus concurrent chemoradiotherapy with 2 patients discontinuing sintilimab in the observation *** patients completed the scheduled course of chemoradiotherapy in the control *** on the Response Evaluation Criteria in Solid Tumors guidelines,the analysis of the observation group revealed that a partial response was observed in 11 patients(32.4%),stable disease was evident in 19 pa

关键词： Immunotherapy Concurrent chemoradiotherapy Locally advanced pancreatic adenocarcinoma Programmed cell death 1 Sintilimab

Rational design and synthesis of Cr_(1-x)Te/Ag_(2)Te composites for solid-state thermoelectromagnetic cooling near room temperature

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 Physics B 2024年第5期33卷 580-586页

作者：孙笑晨谢承昊陈思汗万京伟谭刚健唐新峰 State Key Laboratory of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of materials Science & Engineering Wuhan University of TechnologyWuhan 430070China

materials with both large magnetocaloric response and high thermoelectric performance are of vital importance for all-solid-state thermoelectromagnetic *** two properties,however,hardly coexist in single phase materials except previously reported hexagonal Cr_(1-x)Te half metal where a relatively high magnetic entropy change(-△S_(m))of~2.4 J·kg^(-1)·K^(-1)@5 T and a moderate thermoelectric figure of merit(ZT)of~1.2×10^(-2)@300 K are simultaneously *** we aim to increase the thermoelectric performance of Cr_(1-x)Te by compositing with semiconducting Ag_(2)*** is discovered that the in-situ synthesis of Cr_(1-x)Te/Ag_(2)Te composites by reacting their constitute elements above melting temperatures is unsuccessful because of strong phase ***,at elevated temperatures(T>800 K),Cr_(1-x)Te has a much lower deformation energy than Ag_(2)Te and tends to become more Cr-deficient by capturing Te from Ag_(2)***,Ag is insufficiently reacted and as a metal it deteriorates *** then rationalize the synthesis of Cr_(1-x)Te/Ag_(2)Te composites by ex-situ mix of the pre-prepared Cr_(1-x)Te and Ag_(2)Te binary compounds followed by densification at a low sintering temperature of 573 K under a pressure of 3.5 *** show that by compositing with 7 mol%Ag_(2)Te,the Seebeck coefficient of Cr_(1-x)Te is largely increased while the lattice thermal conductivity is considerably reduced,leading to 72%improvement of *** comparison,-△S_(m)is only slightly reduced by 10%in the *** work demonstrates the potential of Cr_(1-x)Te/Ag_(2)Te composites for thermoelectromagnetic cooling.

关键词： thermoelectromagnetic cooling thermoelectric magnetocaloric composite chromium telluride

在线全文

学校读者我要写书评

暂无评论

湖南省工业领域碳减排与空气质量改善协同

环境科学 2024年第3期45卷 1274-1284页

作者：李楠刘弯弯朱书涵邢晓雯汤克勤王松伟白露南京信息工程大学环境科学与工程学院江苏省大气环境监测与污染控制高技术研究重点实验室江苏省大气环境与装备技术协同创新中心南京210044

气候变暖和空气污染是我国当前面临的主要环境问题.综合使用中国碳核算数据库、能源经济模型和空气质量模型,研究我国湖南省工业领域潜在碳达峰路径及其空气质量协同改善增益.基于中国碳核算数据库和相关工业/能源统计年鉴分析指出,湖南... 详细信息

气候变暖和空气污染是我国当前面临的主要环境问题.综合使用中国碳核算数据库、能源经济模型和空气质量模型,研究我国湖南省工业领域潜在碳达峰路径及其空气质量协同改善增益.基于中国碳核算数据库和相关工业/能源统计年鉴分析指出,湖南省2019年CO_(2)排放总量为310.6 mt,其中工业领域排放占比超70%,主要来自于电力、蒸汽、热力的生产和供应业,非金属矿物制品业及黑色金属的冶炼和压延业等行业.综合考虑未来各工业行业经济增长速率、能源技术进步程度和能源结构优化调整等因素,使用LEAP能源经济模型设置并分析了3种潜在的工业碳达峰情景,包括趋势照常情景(2030年达峰)、中度减排情景(2028年达峰)和强化减排情景(2025年达峰).进一步结合人为源大气污染物排放清单和区域空气质量模型WRF-Chem,以排放行业-部门的同源对应关系为桥梁,模拟分析不同碳达峰路径下空气质量改善响应.结果指出,在3种碳达峰情景中,主要大气污染物浓度均有所降低,长株潭地区尤为显著;强化减排情景力度最大,中度减排情景次之,趋势照常情景相对最弱.制造业减污降碳的协同效果最佳,在不同情景实现碳达峰时,可分别减少ρ(Pm_(2.5))和ρ(Pm_(10))年均值0.6~1.8μg·m^(-3)和1.8~8.9μg·m^(-3).研究可为国家和区域的减污降碳协同实践提供参考和决策依据.

关键词：湖南碳达峰空气质量污染排放 LEAP模型