Search

目的 观察静脉溶栓联合血管内治疗在前循环大血管狭窄导致的低灌注性脑梗死患者中的疗效和 安全性。 方法 回顾性纳入2017年3月-2019年3月在聊城市第三人民医院因单侧颈内动脉或大脑中动脉严重 狭窄导致急性低灌注脑梗死患者，所有患者均给予标准剂量阿替普酶静脉溶栓联合多途径血管内 治疗，随访术后2周、1个月和3个月的NIHSS及mRS评分。 结果 共纳入40例行静脉溶栓联合血管内治疗的急性低灌注脑梗死患者，其中男性24例（60%）， 平均年龄70±4岁（60～80岁）。治疗后患者血管狭窄程度较治疗前明显改善（中位数：18% vs 86%， P

围绕下一代光纤通信系统中轨道角动量（OAM）复用技术的关键问题,基于环状光纤中携带OAM的模式基础理论,仿真分析了环状光纤的不圆度对矢量合成OAM模式的本征奇模和偶模的有效折射率、走离长度以及模场强度分布的影响。结果表明,环状光纤不圆度会使得本征模式奇偶模之间的有效折射率差增大,走离长度减小,导致相应OAM模式在环状光纤中传输时稳定性下降。同时,不圆度的存在还会使矢量合成OAM模式的各本征模式的模场强度分布发生畸变,模场泄漏加剧。

针对100Gbit/s及以上PM-QPSK（偏振复用正交相移键控）相干光通信系统,提出了一种改进的基于统计矩的带内OSNR（光信噪比）监测方案,并在搭建的100Gbit/s PM-QPSK相干接收系统中对该方案进行了数值仿真。结果表明,在525dB的OSNR范围内,该改进方案对不同占空比的RZ（归零）码调制信号的监测误差均小于0.5dB;根据商用相干接收机对接收端OSNR的要求,取其参考值为14dB,则在0.5dB的监测范围内,对CD（色散）的容忍度为2 400ps/nm,对一阶PMD（偏振模色散）即DGD（差分群时延）的容忍度为62ps。

为开发实用的自适应偏振模色散（PMD）补偿控制模块,文章提出并实现了一种采用高性能浮点数字信号处理器（DSP）专注于算法处理、以增强型直接内存存取（EDMA）进行数据传输、以现场可编程门阵列（FPGA）进行数据采集和逻辑控制的新型设计方案。详细介绍了该模块的硬件设计、工作过程和软件设计,并对使用的粒子群优化（PSO）算法进行了重点阐述。给出了模块的工作流程图和算法流程图。实验结果表明,此模块对于二阶PMD补偿效果良好,相对于以往的补偿模块耗时更短。

文章用琼斯传输矩阵法研究了"偏振控制器+保偏光纤"模型仿真器的一阶偏振模色散（PMD）、二阶平行分量、二阶垂直分量及二阶PMD合矢量的统计特性。仿真器的段数越多,其一阶、二阶PMD的统计特性就越接近理论曲线,综合经济因素得出:实验室仿真一阶、二阶PMD特性时采用"3PC+3PMF"模型最为合适。这一结论给下一步的PMD补偿提供了基础。

文章通过软件编程和调试,完成了基于数字信号处理（DSP）的偏振模色散（PMD）补偿逻辑控制模块的软件设计。详细介绍了系统的工作流程、软件及硬件结构,以及粒子群优化（PSO）算法模块在DSP系统中的应用,最后介绍了将该DSP系统应用到二阶PMD自适应补偿系统中进行验证的情况,结果表明,作者设计的DSP逻辑控制模块对一阶及二阶PMD补偿效果很好。

新型相位调制格式技术能够有效地减少光传输损伤,是光传输系统中的重要技术。从理论上分析了光MDPSK（M进制差分相移键控）的调制解调原理,构建了通用的调制解调结构,并首次推导出MDPSK的通式和解调公式,最后以基于CSRZ（载波抑制归零,占空比为67%）码的DQPSK（差分正交相移键控）、8DPSK（3阶差分相移键控）和16DPSK（4阶差分相移键控）为例,用MATLAB软件仿真得到了其调制后的频谱图和解调后的眼图。仿真结果表明,随着级数的增加,MDPSK调制格式的频谱宽度会逐渐变窄,且解调后的眼图也令人满意。

利用矢量有效折射率法对全内反射型光子晶体光纤的色散特性进行了系统的理论研究,着重分析了光子晶体光纤的结构参量对其色散特性的影响,提出了3种有重要应用价值的光子晶体光纤结构参量设计方案,这些设计方案的提出对于促进光子晶体光纤在光纤通信系统中的应用具有重要意义。

微结构光纤是新兴的研究领域.特殊微结构所赋予的诸多新奇性,使得微结构光纤不仅可以成为优异的光传输介质,而且可以用来制作各种新型的光纤器件.文章介绍了微结构光纤在光传输和光纤器件方面的最新实验研究.

偏振模色散已经成为限制长距离高速率光纤通信系统的主要因素 .文章主要介绍了几种偏振模色散补偿中的反馈控制方法 ,并比较了各自的优缺点 .

文章通过仿真得到了非归零（NRZ）码、载波归零（CSRZ）码、NRZ-差分相移键控（DPSK）和CSRZ-DPSK信号在偏振模色散（PMD）补偿前后的偏振度（DOP）值和剩余差分群时延（DGD）值。结果表明,与二进制强度调制（OOK）格式相比,DPSK补偿后的DOP值更多地分布在接近1的范围,剩余DGD值也较小,其中CSRZ-DPSK补偿效果最好,是实现PMD缓解与补偿动态结合的首选调制格式。

文章从理论上推导出了载波抑制归零（CSRZ）码和差分正交相移键控（DQPSK）的调制解调原理公式,给出了实现的具体过程,以及仿真得到的调制后的频谱图和解调后的眼图。结果表明,CSRZ-DQPSK作为新型多级相位调制格式具有更窄的频谱宽度、更高的频谱效率,解调后的眼图也很好,有望成为下一代光纤通信系统的首选传输码型。

Copyright of China Condiment is the property of China Condiment 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.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica 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.)

Copyright of Journal of Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal 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.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis 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.)

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.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica 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.)

Copyright of China Medical Education Technology is the property of China Medical Education 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.)

本文报道采用560℃低温二次液相外延及精心光刻腐蚀,使外延片质量提高,器件的光电特性得到改善。最低I（?）h=1.7mA,外微分量子效率η=25%（单面）,最高连续激射温度为130℃,最大输出功率超过30mW。并采用PbSn焊料改进制管工艺,提高了器件的可靠性。

Objective To observe the contents of various cytokines in aqueous humor and their correlation with creatinine, urea nitrogen, glycosylated hemoglobin and fundus grade in diabetic patients. Methods A cross-sectional clinical study. A total of 53 eyes of 53 patients with type 2 diabetes who had undergone cataract surgery in our hospital from March 2021 to March 2022 were included in the study. Meanwhile, 27 eyes of 27 patients without diabetes who had undergone cataract surgery during the same period were selected as controls. Aqueous humor samples were collected before operation, and the contents of cytokines such as interleulcin-6 (IL-6), IL-8, IL-10, VEGF, MCP-1, ICAM, IFN-γ and TNF-α in aqueous humor of patients in the two groups were detected by CBA technique and compared. The correlations between aqueous humor cytokines and creatinine, urea nitrogen, glycosylated hemoglobin, diabetic fundus lesion grade were analyzed. Results Except IL-10, the levels of IL-6, IL-8, VEGF, MCP-1, ICAM, TNF-α and IFN-γ in aqueous humor in diabetic group were significantly higher than those in control group, and the differences were statistically significant (P < 0.05). In diabetes patients, creatinine was positively correlated with IL-8, VEGF, ICAM and TNF-α in aqueous humor. Urea nitrogen was positively correlated with IL-6, IL-8, VEGF, MCP-1 and ICAM in aqueous humor. The fundus grade of diabetes was positively correlated with IL-8, VEGF and MCP-1 in aqueous humor. There was no significant correlation between HBA1c and various cytokines in aqueous humor. Conclusions In diabetic patients, the level of urea nitrogen and creatinine can predict the level of some cytokines in aqueous humor. In clinical work, it is necessary to focus on urea nitrogen and creatinine to provide a basis for predicting the degree of postoperative inflammatory response and the degree of fundus lesions in these patients. [ABSTRACT FROM AUTHOR]

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) 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.)

Copyright of China Brewing is the property of China Brewing 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.)

The purpose of this study was to investigate the effects of Chinese herbal preparations on the growth performance, serum biochemical indexes and immune performance of pigeons. Using a single-factor experimental design, 240 healthy pigeons at the age of 28 days were selected and randomly divided into four groups, with five replicates in each group and 12 pigeons in each replicate. The group CK was fed with basal diet, and the group A, group B and group C were fed with 0.010, 0.025, and 0.050 g/kg Chinese herbal preparations, respectively. The pre-test period was 7 days, and the formal test period was 30 days. The results showed that at the final weight of pigeons in the group B was significantly higher than that in the group CK (P<0.05). At the age of 56 days, the serum albumin (ALB) content of the group B was extremely higher than that in the group A (P<0.01) and significantly higher than that in the group CK (P<0.05). The serum total cholesterol (TC) content in the groups B and C was significantly higher than that in the group A (P<0.05). At 65 days of age, the serum total protein (TP) content in the group B was significantly higher than that in the group CK (P<0.05), and significantly higher than that in the group A (P<0.05). The serum ALB content in the group B was extremely higher than that in the group CK (P<0.01) and significantly higher than that in the group A (P<0.05). At 42 days of age, the serum immunoglobulin G (IgG) and M (IgM) levels in the group B and group C were significantly higher than those in the group CK (P<0.05). The serum levels of complement C3 and interferon-γ (IFN-γ) in the group B and group C were significantly higher than those in the group CK (P<0.05). At 65 days of age, the serum levels of immunoglobulin A (IgA), IgM, IgG and interleukin-2 (IL-2) in the group B were significantly higher than those in the group CK (P<0.05). The serum levels of complement C3, complement C4, IFN-γ, interleukin-4 (IL-4) and interleukin-6 (IL-6) in the group B were extremely higher than those in the group CK (P<0.01). Studies have shown that the addition of Chinese herbal medicine preparations can effectively improve the growth performance and serum biochemical indexes of pigeons, promote the development of immune organs, and enhance immunity, and the effect of adding 0.025 g/kg is better. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Functional Materials / Gongneng Cailiao is the property of Chongqing Functional Materials Periodical Press 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.)

Copyright of Journal of Shanghai Jiaotong University (Medical Science) is the property of Journal of Shanghai Jiaotong University (Medical Science) 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.)

Copyright of Journal of Clinical Nursing in Practice is the property of Journal of Clinical Nursing in Practice (Editorial Board, Shanghai Jiao Tong University Press) 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.)

This paper reviews some modification methods of biochar, including magnetic modification, heteroatom doping modification, ball milling modification, acid-base modification, and focuses on the application of these modified biochar in the adsorption of antibiotics. Biochar, as an efficient and low-cost adsorbent, has the potential to adsorb antibiotics because of the increasing environmental impact of antibiotics in wastewater. The removal mechanism of antibiotics from wastewater by modified biochar was also analyzed, including electrostatic interaction, H bond, 济interaction, and surface complexation. Some short・ comings of modified biochar were summarized and the corresponding prospects for future work were put forward, so that modified biochar could be better used in the treatment of antibiotics in wastewater and play a greater role in environmental remediation. [ABSTRACT FROM AUTHOR]

Copyright of Modern Preventive Medicine is the property of Modern Preventive Medicine 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.)

Copyright of China Condiment is the property of China Condiment 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.)

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.)

Objective To investigate the iodine nutrition status of pregnant women in Aba Tibetan and Qiang Autonomous Prefecture (hereinafter referred to as Aba prefecture), and to provide scientific basis for the adjustment of prevention and treatment policy of iodine deficiency disorders (IDD) for pregnant women in ethnic areas. Methods In 2022, five towns or streets were selected as monitoring sites in 13 counties (cities) under the jurisdiction of Aba prefecture, and at each site 20 pregnant women were randomly selected for survey on the iodine content of random urine samples and edible salt at home. The coverage rate of iodized salt, the consumption rate of qualified iodized salt, and the urinary iodine level of pregnant women in different regions, different ethnic groups, different age groups, and different gestational periods were analyzed. Spearman rank correlation analysis was used to analyze the correlation between urinary iodine and salt iodine, and χ² test was used to compare the rates. Results A total of 1 302 salt samples were collected in 13 counties of Aba prefecture in 2022. The median of salt iodine was 27.00 mg/kg, and the coverage rate of iodized salt, the qualified rate of iodized salt, and the consumption rate of qualified iodized salt were 99.85%, 97.54%, and 97.39%, respectively. Among pregnant women in different areas, there were significant differences in the coverage rate of iodized salt (χ²=24.077, P < 0.020), the qualified rate of iodized salt (χ²=53.825, P < 0.001), the consumption rate of qualified iodized salt (χ²=48.449, P < 0.001), and the median of iodized salt (Z=20.675, P < 0.001). Among pregnant women of different ethnic groups, there were no significant differences in iodized salt coverage rate (χ²=1.728, P=0.631), qualified rate of iodized salt (χ²=0.851, P=0.361), consumption rate of qualified iodized salt (χ²=1.812, P=0.401), and the median of iodized salt (Z=2.060, P=0.380). Among pregnant women of different ages, there were significant differences in the qualified rate of iodized salt (χ²=6.914, P=0.016) and the consumption rate of qualified iodized salt (χ²=5.939, P=0.023), but there was no significant difference in the coverage rate of iodized salt (χ²=0.241, P=0.623) and the median of iodized salt (Z=-0.382, P=0.703). Among women at different gestational periods, there was significant difference in the median of salt iodine (Z=13.381, P < 0.001), but there was no significant difference in the coverage rate of iodized salt (χ²=0.486, P=0.784), the qualified rate of iodized salt (χ²=0.714, P=0.713), and the consumption rate of qualified iodized salt (χ²=0.447, P=0.813). A total of 1 302 urine samples of pregnant women were collected, and the median of urinary iodine was 174.5 μg/L. There was significant difference in urinary iodine of pregnant women in different regions (H=133.345, P < 0.001), but there was no significant difference in urinary iodine levels among different ethnic groups (H=5.436, P=0.143), age groups (H=0.183, P=0.913), and different gestational periods (H=2.937, P=0.302). There was no correlation between salt iodine content and urinary iodine level in pregnant women (rs=0.198, P=0.659). Conclusion The iodine nutrition level of pregnant women in Aba prefecture is generally appropriate, but there is still a risk of iodine deficiency in remote grassland counties. In the future, it is suggested that a special investigation and study on the iodine supplement rate of pregnant women in minority areas be carried out to dynamically grasp the iodine nutrition status during pregnancy. If necessary, it is suggested to promote special iodized salt for pregnant women and accurately guide pregnant women to supplement iodine scientifically. [ABSTRACT FROM AUTHOR]

Copyright of Biotechnology Bulletin is the property of Biotechnology Bulletin 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.)

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute 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.)

Copyright of Feed Research is the property of Editorial Board of Feed Research 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.)

Glucocorticoid-induced osteoporosis (GIOP) is the most common secondary osteoporosis in children.?Because it affects the development of children's bones and leads to growth development disorders, and reduces the quality of life in children, it has gradually attracted wide attention worldwide.?GIOP is classified to the category of bone loss and bone impotence in traditional Chinese medicine. Its occurrence is closely related?to warm kidney qi.?Kidney is the bank of water. Water is conquered by fire. When heat causes marrow exhaustion, the bone is suffered from non-nourishment. Glucocorticoid is the source of GIOP. It belongs to the hot and acrid in traditional Chinese medicine. Overdose?of glucocorticoids may cause consumption of kidney?essence?due to?intense heat, which is consistent with the theory of marrow loss and bone exhaustion caused by warm kidney qi. Based on this theory, this paper explores the pathogenesis of GIOP in traditional Chinese medicine combined with modern medical research, in order to provide ideas for clinical dialectical treatment. [ABSTRACT FROM AUTHOR]

Copyright of China Medical Education Technology is the property of China Medical Education 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.)