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我国承诺在2030年前实现碳达峰，2060年实现碳中和，实现这一目标需要全社会共同努力，建筑业更是要积极转型升级，实现绿色可持续发展。钢结构属于典型的绿色环保节能型结构，符合循环经济和可持续发展的要求，近年来得到了快速发展，2020年钢结构产量达到了8 900万 t。通过对钢结构行业近年来的调研数据进行详细分析，阐述了钢结构行业的发展现状，重点分析了钢结构相关政策、加工区域特点、钢材品种及强度应用、钢结构应用领域、人均生产劳动率、行业集中度等，指出了双碳目标下我国钢结构行业的发展趋势及路径，对钢结构行业发展有重要指导作用。 more...

针对城市配电网大量使用电缆引起谐波谐振导致变电站内10 kV母线电压互感器高压侧熔断器频繁熔断的问题，提出一种基于模态分析的电动汽车充电站并网谐振分析模型。首先，基于PWM整流器双闭环控制方法建立了单台充电机输入阻抗模型，基于线路分布式参数模型建立了电缆电路的等效阻抗模型。然后，建立了含多台充电机的电动汽车充电站并网模型，并结合节点参与因子和元件灵敏度指标给出了电动汽车充电站并网谐波谐振分析流程。最后，以实际的局部配电网为算例，结果表明本文所提方法能够快速解析电动汽车充电站并网的谐波谐振情况，通过计算元件归一化灵敏度值验证了电缆对地电容和充电机直流输出电压对谐振具有较高参与度，规划人员在规划设计时应重点考虑上述因素。 more...

【目的】探讨阿托伐他汀能否通过抑制AVP的分泌而延缓心肌纤维化，为改善心肌梗死后心室重塑提供新思路。【方法】通过结扎大鼠冠状动脉前降支建立大鼠心肌梗死模型。建模成功后将大鼠分为假手术组（sham组）、心肌梗死大鼠安慰剂治疗组（MI组）及心肌梗死大鼠阿托伐他汀治疗组（A组），每组各有10只大鼠。干预5周后，超声心动图检测大鼠心功能；处死大鼠后，收集心肌组织标本，计算左心室质量指数；ELISA法检测左心室非梗死区和血清的血管加压素（AVP）含量；Masson染色检测心肌间质纤维化水平；免疫组织化学染色检测左心室非梗死区Ⅰ型胶原的表达；Western blot测定左心室非梗死区转化生长因子-β1（TGF-β1）蛋白的表达。【结果】干预5周后，Sham组、MI组和A组分别存活10只、9只和10只大鼠。与Sham组大鼠比较，MI组和A组大鼠的左室质量（LVM）和左室质量指数（LVMI）增加、左室射血分数（LVEF）降低、心肌间质纤维化明显加重、左心室非梗死区Ⅰ型胶原蛋白的表达、AVP含量以及TGF-β1蛋白表达水平明显升高（P more...

【目的】 探讨320排动态容积CT血管造影对评估糖尿病眼动脉硬化的临床价值?【方法】对30例非糖尿病患者和22例糖尿病患者进行320排动态容积CT血管造影检查,对所有扫描原始数据行最大密度投影(MIP)?容积再现(VR)?多平面重建(MRP)及曲面重建(CPR),观察眼动脉的管腔情况?【结果】 320排动态容积CT血管造影检查可以清晰显示眼动脉形态?走行,以及病变的部位?情况?22例糖尿病患者血管呈不同程度粥样硬化表现?其中颅内段轻度狭窄6侧,中度狭窄4侧;视神经管内段轻度狭窄2侧,中度狭窄4侧;眶内段轻度6侧,中度狭窄2侧?斑块性质以钙化斑块或混合斑块为主?【结论】 320排动态容积CT血管造影可以对糖尿病眼动脉硬化进行无创?准确?快捷的评估,具有重要的临床价值? more...

本文根据CCITT建议提出了STM—4帧定位方案的常规设计方法,分析了采用容错技术后改进了的帧定位方案。同时,采用1比特容错还是2比特容错;在帧同步态和失步态可否采用不同长度的帧定位码;以及帧定位码的码型等,也作了具体分析。最后提出了一种STM—4帧定位的优选方案,在不过于增加物理实现难度的前提下,其各项指标均优于CCITT建议。

根据钢框架强柱弱梁的抗震设计原则,按照有效控制梁上塑性铰位置的思路,采用在梁腹板进行开孔削弱的节点形式促成塑性铰的形成,进行了反复荷载历程下的五组试件破坏试验,测试了构件相关的力学性能,探讨了梁柱节点的滞回性能及其极限承载力。结果表明,采用腹板开孔的构造形式,可以控制节点处的塑性铰形成位置,降低了连接焊缝发生脆性破坏的可能性,较大程度地改善了节点抗震性能。

东北虎难产助产刘胜瑞，李庆国，李志庚，刘玉文魏宏义，张丽华（辽宁省锦州畜牧兽医学校）（锦州市北湖公园）东北虎难产病例较为罕见。虎是凶猛野兽，难于接近，一旦发生难产，助产比较困难。１９９１年９月７日我们对锦州市北湖公园一例东北虎难产进行了助产，取得了满...

古木参天,人迹罕至的壶瓶山国家级自然保护区林海深处,不仅是国家一级保护动物华南虎的乐园,也是国家二级保护动物猕猴的王国.自古以来,壶瓶山就是猕猴的栖息地,这里流传着许多猴子的传奇故事.如猴子抢亲,说的是一农家女路遇猴群,被猴子抬进山洞,两年后抱回了一个半边猴

1、紫翅椋鸟Sturnus vulgaris Linne’在中国已记录的分布区有新疆、青海、甘肃、西藏、河北、山东、福建（夏候鸟或旅鸟）、广东沿海（迷鸟）。刘宽明同志1985年9月10日在辽宁省大连市营城子采到一号标本,经鉴定属疆北亚种S.v. porphyronotus Sharpe. 采集地生境为开阔的荒地,遍生杂草,成小群（约10余只）正在地面觅食。从地理分布区来看,这群紫翅椋鸟当属迷鸟。 2、赤颈鸫Turdus ruficollis pallas 在国内已记录的分布区有内蒙、青海、甘肃、宁夏、新疆、西藏、四川、云南、湖北、陕西、河北（冬候鸟或旅鸟）。 1986年11月7日秦玉词同志在大连市郊马栏村西头道沟采得一号标本,经鉴定属指 more...

Copyright of Chinese Journal of Stroke is the property of Chinese Journal of Stroke Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Science & Technology of Food Industry is the property of Science & Technology of Food Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Journal of Shanghai Jiao Tong University (1006-2467) is the property of Journal of Shanghai Jiao Tong University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Railway Standard Design is the property of Railway Standard Design Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

1986年10月,天津塘沽动物园饲养的一只东北虎（雌性）病死,我们对其进行尸检,从其胆管中发现一种吸虫,经鉴定,认为是后睾科,支睾属中的中华分支睾吸虫Clonorchissinensis（Cobbolb,1875）。本虫于1874年首次在加尔各答一华侨的胆管发现（Mcconnel,1875）,至1908年始在国内证实（Heanley,1908）。1975年在我国湖北省江陵西汉古尸的粪便中发现本虫虫卵,证明本虫在我国至少已有2,100余年的历史（魏德祥,1980）。在对本虫有正式记载的100余年内,中外学者作了大量的研究工作,发现本虫除寄生在人体外,还广泛地在家畜及野生的哺乳类动物中寄生。 more...

Copyright of Journal of Hebei University of Science & Technology is the property of Hebei University of Science & Technology, Journal of Hebei University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Journal of Soil & Water Conservation (1009-2242) is the property of Institute of Soil & Water Conservation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Chinese Journal of Dermatovenereology is the property of Xi'an Jiaotong University Periodicals Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

The Huainanzi 淮南子put forward the idea of "qisu 齊俗" (integrating customs) as a response to the issue regarding “the ideal way to coordinate different customs of the whole country.” However, an examination of the arguments advanced in the text reveals that it actually involves two stances: one concerns the coexistence of diverse customs, and the other is about the unification of customs under one umbrella; the former is referred to in this article as “respect for diversity” and the latter as "unification of customs." In the mainstream view of later generations, the prevailing stance on customs in the Huainanzi is "respect for diversity,"; and the concept of "unification of customs"; reflects a misinterpretation of its ideas by scholars. The purpose of this article is threefold: first, to reveal the reality that the two stances on customs in the Huainanzi are concurrent; second, to further clarify the relationship between the two stances based on a proper examination of this reality; and finally, to explore the way in which these two stances were put into practice, with a special focus on the question of how "unifying customs" without domination could be implemented. This article argues that the Huainanzi's stance on customs is to preserve "respect for Diversity" through "unification of customs." For this reason, to simply define the text's stance as "unification of customs" or "respect for diversity" is likely to be biased. [ABSTRACT FROM AUTHOR] more...

Copyright of Electronic Science & Technology is the property of Electronic Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Chinese Journal of Arteriosclerosis is the property of Chinese Journal of Arteriosclerosis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Railway Standard Design is the property of Railway Standard Design Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

[Objective] The cover development design for urban rail transit parking lot is very complicated, requiring more new column grids. Moreover, after the cover development, the omnidirectional antenna set up on the roof of the complex building cannot cover the ground area of the parking lot. In order to effectively realize the wireless communication coverage of the parking lot, it is necessary to study the related schemes and key technologies. [Method] Based on the systematic engineering design of TETRA (terrestrial trunked radio) communication system for the parking lot of Textile City Station on Xi’an Metro Line 6 and in view of the difficulties of wireless communication coverage engineering, the frequency planning and allocation scheme of wireless communication system is proposed. A wireless communication coverage scheme is proposed for the parking lot, switch area, access sections and roads in the non-cover area of the parking lot. [Result & Conclusion] FA (frequency allocation) frequency group for wireless communication coverage is adopted for the parking lot of Textile City Station, which ensures frequency interval and avoids same frequency interference. The public security wireless communication system is introduced into the above parking lot, and the scheme of signal route coverage combined with the dedicated wireless communication system is adopted. Directional antenna is used as the coverage mode for the covered parking area to replace the omnidirectional antenna on the roof. Antenna correlation is used for the depot, antenna reinforcement for the throat area, and antenna coverage for U-shaped slot to solve the cross-zone switching, and directional antennas are adopted to cover the surrounding roads by utilizing building sidewalls or columns. The proposed wireless system coverage scheme for the cover development parking lot not only reduces the system interference and the impact on the existing operation, but also effectively solves the problem of the wireless communication coverage for the cover development parking lot, saving the project investment. [ABSTRACT FROM AUTHOR] more...

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Zhejiang Electric Power is the property of Zhejiang Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Objective To investigate the role of autophagy in contrast-induced acute kidney injury (CI-AKI) in rats and to explore its possible mechanism. Methods SD rats were randomly divided into control group, acute kidney injury model group (intravenous injection of contrast medium ioversol via tail vein; model), rapamycin(RAPA) group and hydroxychloroquine (HCQ)group. Blood urea nitrogen(BUN) and serum creatinine(Scr) contents were measured and the potential change foun in renal pathology was detected by HE staining and microscopy. Transmission electron microscopy was used to observe auto-phagy-related changes in ultrastructure.Western blot was used to observe the expression of microtubule-associated protein 1 light chain 3(LC3)Ⅱ/LC3Ⅰ,ubiquitin-binding protein p62 and Histone deacetylase 4(HDAC4). The expression of HDAC4 was also observed by RT-qPCR. Results Compared with control group, the level of BUN, Scr and HDAC4 expression in the model and HCQ group was increased (P＜0.01),the proximal tubules of the kidney were significantly damaged. In the model group, autophagososomes and autolysosomes increased, accompanied by an increase of LC3Ⅱ/LC3Ⅰ and a decrease in the p62 level (P＜0.05,P＜0.01); Compared with model group, there were more autophagosomes and autolysosomes were found in RAPA group(P＜0.01), accompanied by increased LC3Ⅱ/LC3Ⅰ ratio and decrease in the p62 and HDAC4(P＜0.05,P＜0.01). In contrast, the number of autophagy related structures decreased in HCQ group(P＜0.01), accompanied by the simultaneous increase of LC3Ⅱ/LC3Ⅰ, p62 and the increase of HDAC4(P＜0.01). Conclusions Ioversol may induce autophagy activation, while enhancing autophagy by RAPA alleviates CI-AKI induced renal dysfunction. The mechanism is potentially atributed to the regulation of HDAC4. [ABSTRACT FROM AUTHOR] more...

Copyright of Research of Soil & Water Conservation is the property of Institute of Soil & Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Guangdong Agricultural Sciences is the property of South China Agricultural University, Guangdong Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Journal of Mechanical Strength / Jixie Qiangdu is the property of Zhengzhou Research Institute of Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Zhejiang Electric Power is the property of Zhejiang Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Journal of New Medicine is the property of Sun Yat Sen University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Objective To explore the role of miR-34a methylation in the development of gastric cancer,and explore the correlation of miR-34a methylation with gastric cancer, pathological features and Helicobacter pylori(HP)infection. Methods The methylation level of miR-34a gene CpG island of thirty-one gastric cancer patients and tweenty-four healthy people were detected by matrix-assisted laser desorption/ionisation-time-of-flight mass spectrometry(MALDI-TOF MS)technique. Results The overall average methylation level of miR-34a was higher in gastric cancer than that in the control, the average methylation of miR-34a CpG_5,CpG_12.13 was significantly higher in the gastric cancer group than they were in the control group(51.7%±5.9% vs. 37.8%±7.8%,84.61%±8.2% vs. 68.1%±12.1%,P＜0.01).The methylation level of miR-34a CpG_5 in the lymph node metastasis group was significantly higher than that in the non-lymph node metastasis group (53.55%±4.86% vs. 47.22%±6.07%,P＜0.01),and the methylation of CpG_5 in TNM stage (stage Ⅱ + stage Ⅲ) was higher than that in stage Ⅰ(53.21%±4.8% vs. 46.57%±6.9%, P＜0.05). Conclusions The miR-34a methylation is potentially associated with the occurrence and development of gastric cancer. [ABSTRACT FROM AUTHOR] more...

Copyright of Food & Machinery is the property of Food & Machinery Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...