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应用于孤岛型微电网以实现频率控制功能的传统控制器多为分数阶PID（fractional order PID，FOPID）控制器及模糊分数阶PID（fuzzy fractional order PID，FFOPID） 控制器，二者的控制性能均存在局限性。针对这一问题，设计了一种变论域混合FFOPID控制器，用于提高孤岛微电网的频率控制性能。通过对比FOPID、FFOPID以及变论域混合FFOPID3种控制器作用时的不同效果，证明了变论域混合FFOPID控制器相比其他控制器对于孤岛微电网的频率控制有着更好的控制性能。同时考虑了反馈信号受到测量噪声干扰时对控制器的控制性能产生影响进而使得孤岛微电网频率波动增大的情况，并针对此问题使用了动态数据校正（dynamic data reconciliation，DDR）滤波技术。通过对比时域仿真中FOPID、FFOPID以及变论域混合FFOPID控制器各自作用时孤岛微电网频率偏差的输出结果，验证了DDR滤波技术对孤岛微电网的频率控制的显著效果。

根据2013—2021年湖北省第二次陆生野生动物资源调查和林业部门监测资料，参阅历史文献，按照《中国生物多样性红色名录：哺乳动物》的分类系统对湖北省哺乳动物种类进行重新厘定，分析其多样性、区系及分布。确认湖北省哺乳动物有9目29科86属132种，在1998年杨其仁等所记录的121种基础上，新增23种，减少12种，其中国家重点保护野生动物28种，中国特有种32种，列入中国哺乳动物红色名录近危等级以上51种。陆栖哺乳动物中东洋种87种、古北种35种、广布种8种。分布型以东洋型、南中国型物种占优势。按照全国陆生野生动物调查单元区划方案，湖北大巴山山地、武陵山山地、清江切割山地、武当山山地和大娄山中山峡谷物种最丰富，物种数91~105种；长江中游平原和三峡谷地分别有64、69种；大别山山地、南襄盆地、江汉平原和桐柏山山地有40~50种。

现行《建筑钢结构防火技术规范》(GB 51249—2017)未给出火灾下钢结构的局部稳定设计方法,为了获得轴心受压焊接H形高强Q690钢柱高温下的局部稳定性能,考虑钢材高温下力学性能退化、截面高温下焊接残余应力降低及初始几何缺陷,采用ABAQUS软件建立经试验验证的高温局部稳定分析有限元模型,得到焊接H形高强Q690钢柱在不同温度下的局部屈曲应力和极限应力。研究表明:当温度低于550℃时,钢柱在高温下和常温下屈曲应力具有相同的变化趋势;高温下的残余应力值和初始几何缺陷对屈曲应力有较大的影响,但对极限应力影响较小。

海上风能资源丰富且开发潜力巨大，海上风电开发对于应对全球气候变化问题具有重大意义。重点介绍了欧洲国家海上风电的发展现状和海上风电及输送关键技术。给出了欧洲主要的海上风电场装机容量和相关政策，并指出随着开发区域不断向深海拓展，有效降低成本至关重要。在海上风电及送出关键技术方面，介绍了大功率风力发电机、海底电缆、机组基础结构技术，以及海上风电直流汇集系统和不控整流送出方案。最后给出建议，对于海上风电场规划及并网方式选择，需要在考虑并网导则和具体技术基础上确定最终方案。

对看台事故的分析表明,节点损坏是导致结构整体倒塌的重要诱因之一。围绕苏州世乒赛装配式钢结构临时看台盘扣节点开展了研究。首先,介绍了该项目结构体系和盘扣节点的设计,进而考虑材料和接触的非线性,建立了盘扣节点的三维有限元模型;随后,针对衔接盘抗剪承载力、横杆连接节点抗拉(压)承载力和斜撑连接节点抗拉(压)承载力开展了非线性分析,获取了节点的屈服承载力,并将横杆节点承载力与文献已有试验结果进行了对比,验证了数值模拟方法的准确性;最后,对临时看台整体结构建立模型进行了设计荷载下的受力分析,并选取了其中一个9根杆件交汇节点,开展了设计荷载下盘扣节点复杂荷载情况下的非线性力学分析。结果表明:设计荷载下,结构横杆和斜撑最大轴力均在节点屈服承载力的范围内。同时,所分析的复杂受力节点基本处于弹性状态,所做研究可为类似临时看台的设计与建造提供参考。

【目的】探索社区不同年龄段女性端粒长度改变规律及其衰老分值的变化特点。【方法】从南昌市区多家三甲医院和部分社区卫生服务中心健康体检人群中按年龄分层随机抽取20岁以上女性作为研究对象，进行端粒相对长度检测和分析，同时采用《生理-心理-社会三维人体衰老度量表（PPSHAS）》量表测量其衰老分值。【结果】本次研究共获得有效样本406例，不同年龄组的端粒相对长度的差异有统计学意义（P

综合考虑了突发包所经历跳数和突发包的长度等因素,文章给出了一种新型的支持服务质量（QoS）的光突发交换（OBS）数据信道调度协议——考虑跳数的改进型JET模式下的优先级抢占（H-PPJET）协议。文章在OBS网络环境中对H-PPJET协议进行了仿真,并与JET模式下的优先级抢占（PPJET）协议进行了对比,仿真结果表明,H-PPJET协议改善了网络的吞吐量和丢包率性能。

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Common terahertz wave sensors work under normal incidence conditions to distinguish the device under test (DUT). However, if the excited terahertz wave is not normal incident, its discrimination linearity will be affected. In this paper, a symmetrical gear-shaped terahertz metamaterial sensor is proposed. The structure of the sensor consists of a surface gear shaped metal pattern and a polyurethane substrate. This design has high transmittance in the range of 0. 2 ~ 1. 2 THz, and when the incident angle of electromagnetic waves changes within the range of 0° ~ 70°, the resonance point of the sensor changes very stably and is insensitive to the incident angle, which compensates for the current shortcomings of sensors and has good ability to resist the uncertainty of the incident angle. At the same time, this sensing unit is also insensitive to the polarization of the incident wave, which expands the application range of terahertz sensors. The mathematical relationship between the sensitivity S and the refractive index of the object to be tested is derived. The sensitivity of the sensor is tested by the liquids with different refractive indices as the measurands. The result shows that there is a good linear relationship between the change of resonant frequency and the refractive index of sample. The sensitivity of the sensor is between - 0. 28 to - 0. 13 THz/ RIU, demonstrating superior performance. [ABSTRACT FROM AUTHOR]

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Copyright of Oilfield Chemistry is the property of Sichuan University, Oilfield Chemistry 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.)

Objective In response to the demand for small-sized and high-performance profile control agent particles for high water content well groups in Bohai Oilfield, solid core structure submicron-micron swellable particle profile control agent (PAS) was synthesized through free radical polymerization using acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as main agents, N, N'-methylenebisacrylamide (MBA) and polyethylene glycol diacrylate (PEGDA) as crosslinking agents, and nano silica as the modifying agent. Methods The two-step process of pre-grinding-ball milling was used for grinding, and its molecular structure was characterized by infrared spectroscopy. The effects of temperature and salinity on its properties were studied. The injection performance, deep sealing ability, erosion resistance, and enhanced oil recovery of PAS were studied using a sand-filled pipe model displacement experiment. Results PAS is evenly distributed in an aqueous solution, with a median particle size of 17.3 μm, and the strength of the gel was still high after 90 days of aging at 120 ℃ and 200 000 mg/L. The experiment on plugging and enhanced oil recovery showed that at a permeability of 3 000×10−3 μm², the plugging rate reached over 98.0%, and the enhanced oil recovery of heterogeneous cores was increased by more than 22.8%. Conclusion Field tests with an average daily oil production of 28.31 m³ on high porosity and permeability oil reservoirs were carried out, which showed significant effects on oil production rate and water control. [ABSTRACT FROM AUTHOR]

L-tryptophan is the most important amino acid in the human body and plays a key role in human growth and development. In this study, a highly sensitive electrochemical sensor was prepared by modifying ferroferric oxide nanomaterials (Fe3O4 NMs) on the surface of carbon cloth (CC) for the detection of L-tryptophan samples. The introduction of Fe3O4 NMs provided the sensor with a large electrochemical area and high electrocatalytic performance, and the detection sensitivity was significantly improved due to the increase of electrode channels for the mass transfer process. The current peaks measured via differential pulse voltammetry (DPV) were linearly related to a variety of concentrations of L-tryptophan.Under the optimal conditions, the limit of detection (LOD) of this homemade sensor was as low as 1.68 μM for L-tryptophan, and the linear concentration range was 5～200 μM,with an increase in sensitivity of 1.01 mA/M·cm². In addition, the Fe3O4 NMs/CC-based sensor showed good accuracy and stability in actual sample detection like serum and urine, indicating that the system possesses the potential to be a point-of-care testing. [ABSTRACT FROM AUTHOR]

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Objective To analyze the values of peripheral blood red blood cell distribution width (RDW), neutrophil (NEU) to lymphocyte (LYM) ratio (NLR), fibrinogen (FIB) to albumin (ALB) ratio (FAR) and surfactant protein A (SP-A) in evaluating patient condition and risks of acute exacerbation of COPD. Methods A total of 200 patients with COPD admitted to Hebei University Affiliated Hospital from January 2021 to December 2023 were selected as study subjects. All the patients had follow-up visits in the outpatient department within the past three months. According to the presence or absence of acute exacerbation, they were divided into exacerbation group (n = 96) and non-exacerbation group (n = 104). Meanwhile, 50 healthy volunteers were assigned to a control group. Peripheral blood RDW, NEU, LY, FIB, ALB and SP-A in the three groups were compared. NLR and FAR were calculated. The correlation of RDW, NLR, FAR, and SP-A with the severity of AECOPD was analyzed. ROC curves were used to analyze the values of RDW, NLR, FAR, and SP-A in evaluating the risks of acute exacerbation of COPD. Multivariate logistic regression analysis was conducted to identify the risk factors for AECOPD. The differences in RDW, NLR, FAR, and SP-A were compared among the patients with different prognoses. Results Peripheral blood RDW, NEU, NLR, FIB, FAR and SP-A were higher in the exacerbation group than in the non-exacerbation group, whereas LYM and ALB were lower (P < 0.05). Levels of RDW, NLR, FAR and SP-A were higher in the patients with grade Ⅲ AECOPD than those with grade Ⅱ or grade Ⅰ AECOPD (P < 0.05). RDW, NLR, FAR, SP-A, and grade of patient condition in patients with AECOPD were positively correlated in pairs (P < 0.05). The sensitivity, specificity and area under the ROC curve of combined prediction of AECOPD using RDW, NLR, FAR and SP-A were 0.798 and 0.830 (95% CI: 0.738 ~ 0.922), all of which were superior to prediction using a single indicator. Multivariate analysis found that smoking, RDW > 14.33%, NLR > 2.80, FAR > 0.08, and SPA > 2.21 ng/mL were risk factors for acute exacerbation of COPD (P < 0.05). RDW, NLR, FAR, and SP-A in the readmission group within 30 days after discharge were higher than those in the non-readmission group (P < 0.05). Conclusions RDW, NLR, FAR, and SP-A are closely related to the patient condition of COPD, and can help to predict the risk of acute exacerbation and prognosis. Therefore, they are worthy of monitoring in clinical practice. [ABSTRACT FROM AUTHOR]

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A new refining concept aims to remove both B and P simultaneously in silicon has been proposed in Si/Slag/Me (Me: Fe or Cu) system. Both liquid Si and liquid Fe/Cu phases are separated by the molten slag phase spontaneously based on their physicochemical properties. Equilibrium evaluations indicate that both the B and P, the most difficult impurities to be removed from ultra-pure silicon, can be redistributed to the slag and another metal phase. It is experimentally shown that the simultaneous removal of both B and P via a single metallurgical refining process is possible by three-layer refining. The metal phase plays an P impurity collector role in the system, but has little effect on B adsorptions. Liquid Fe works better than the molten Cu for P adsorptions. Addition of CaF2 to the binary CaO-SiO2 slag increase significantly the remove rates of B and P, due to CaF2 can reduce the viscosity of slag. Increasing temperature from 1 600 °C to 1 700 °C improves the B remove rate significantly, but has little effect on P remove. [ABSTRACT FROM AUTHOR]

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The aim of this study was to analyze the effects of composite enzyme preparations on the growth performance, slaughter performance, nutrient apparent digestibility, and ketone body quality of beef cattle. A total of 120 yaks from a large-scale yak farm in Xizang Autonomous Region were selected as test subjects, and were randomly divided into four groups: control group, 100 g/t compound enzyme preparation group, 200 g/t compound enzyme preparation group, and 300 g/t compound enzyme preparation group. Statistical analysis was made on the significant difference of the effects of compound enzyme preparation on various indicators of beef cattle. The average daily weight gain of the experimental group with the addition of complex enzyme preparations in the feed was significantly higher than that of the control group (P<0.05), and the feed to weight ratio was significantly lower than that of the control group (P<0.05); the slaughter rate and backfat thickness of beef cattle in the experimental group showed significant differences compared to the control group (P<0.05); the apparent digestibility of crude protein and neutral detergent fiber in the experimental group of beef cattle was significantly higher than that in the control group (P<0.05); the ketone weight and eye muscle area of the experimental group of beef cattle were significantly higher than those of the control group (P<0.05), while the cooked meat rate and shear force were significantly lower than those of the control group (P<0.05). The results induicate that 200 g/t composite enzyme preparation can significantly improve the growth performance, slaughter performance, nutrient apparent digestibility, and ketone body quality of beef cattle. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Modern Laboratory Medicine is the property of Journal of Modern Laboratory Medicine 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 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.)

Objective To investigate the clinical manifestations, endoscopic characteristics, and prognostic factors of patients with colorectal extranodal NK/T cell lymphoma. Methods The clinical data of 52 patients with colorectal extranodal NK/T cell lymphoma admitted to the First Affiliated Hospital of Zhengzhou University from January 2013 to January 2023 were retrospectively analyzed. Their clinical manifestations and endoscopic characteristics were summarized, and the prognostic factors were analyzed by Cox regression model. Results Among the 52 patients with colorectal extranodal NK/T cell lymphoma, there were 35 males and 17 females, with a male-to-female ratio of 2.06∶1. Among the general symptoms, abdominal pain was the most common (39 cases), and B symptoms occurred in 47 patients, among which fever was the most common lymphoma B symptom (42 cases), and gastrointestinal perforation was the most common complication (18 cases). Forty-three patients underwent colonoscopy, and the main manifestations under endoscopy were the ulceration type (24 cases). The ulcers were irregular at the edges and often covered with moss at the bottom. The median survival time was 4.3 months. Multivariate Cox regression analysis showed that hemocytic syndrome (HR=8.50, 95% CI: 1.679-8.328, P=0.001), serum albumin (HR=3.59,95% CI: 1.017-6.551, P=0.048), and with or without chemotherapy (HR= 0.31, 95% CI: 0.246-1.061, P=0.025) were independent factors influencing the overall survival of patients with colorectal extranodal NK/T cell lymphoma. Conclusions Colorectal extranodal NK/T cell lymphoma is a rare disease with a very poor prognosis. When patients present with abdominal pain and lymphoma B symptoms, and when ulcers with irregular edges and moss covering the bottom are found under endoscopy, the disease should be considered, and endoscopic biopsy should be taken in time for pathological diagnosis. The prognosis of patients with hemophagocytic syndrome and hypoproteinemia is poor. This disease should be treated with chemotherapy and surgery, and on this basis, hemophagocytic syndrome and hypoproteinemia should be treated to improve the prognosis of patients. [ABSTRACT FROM AUTHOR]

Copyright of Diamond & Abrasives Engineering is the property of Zhengzhou Research Institute for Abrasives & Grinding 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 Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management 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.)