摘要：This paper introduces the performances of compound gear pump. Based on the target of having the smallest mass per unit volume, the paper established a mathematical model of optimization, and obtained the results of optimization of the pump.

摘要：本研究采用简单的两步法合成了由非晶态硫化钴和碳纳米管结合形成的异质结CNT-a-CoS_(x)催化剂.与晶态CoS_(x)和碳纳米管形成的晶态CNT-c-CoS_(x)异质结催化剂相比,非晶态CNT-a-CoS_(x)具有丰富的活性位点、优异的电子输运特性和大的电化学活性面积等结构特性,因而在酸性电解质中表现出更高的电催化氢析出性能.达到10 m A cm^(-2)的阴极电流密度时,CNT-a-CoS_(x)所需的过电位仅为76 m V.更值得注意的是,经过60,000 s的电化学耐久性测试,未观察到明显的电催化性能下降.这一简单的原位构建异质结催化剂的策略为设计和合成活性高、稳定性好的非晶异质结电催化剂提供了技术支持.

摘要：Manganese tetravalent oxide(MnO_(2)),a superstar Faradic electrode material,has been investigated extensively for capacitive desalination,enabling higher salt adsorption capacity compared to the great majority of carbonous ***,few works paid attention on the relationship between the valences of manganese oxide and their desalination *** the first time,we prepared the spindle-like manganese oxides/carbon composites with divalent(MnO@C),trivalent(Mn_(2)O_(3)@C)and divalent/trivalent(Mn_(3)O_(4)@C)manganese by pyrolysis of manganese carbonate precursor under different condition,*** electrochemical behavior in three-electrode system and electrosorption performance obtained in hybrid membrane capacitive deionization(HMCDI)cells assembled with capacitive carbon electrodes were systematically evaluated,*** salt adsorption capacity(as large as 31.3,22.2,and 18.9 mg·g^(−1))and corresponding average salt adsorption rates(0.83,0.53,and 1.71 mg·g^(−1)min−1)were achieved in 500 mg·L^(−1) NaCl solution for MnO@C,Mn_(2)O_(3)@C,and Mn_(3)O_(4)@C,*** fifteen electrosorption-desorption cycles,ex-situ water contact angle and morphology comparison analysis demonstrated the superior cycling durability of the manganese oxide electrodes and subtle difference between their surface ***,density functional theory(DFT)was also conducted to elaborate the disparity among the valence states of manganese(+2,+3 and +2/+3)for in-depth *** work introduced manganese oxide with various valences to blaze new trails for developing novel Faradic electrode materials with high-efficiency desalination performance by valence engineering.

摘要：We have designed and synthesized NaGdF4：Nd^3＋, Yb^3＋, Tm^3＋. magnetic nano- phosphors with combined dual-mode downconversion （DC） and upconversion （UC） photoluminescence upon 800 run excitation. Hexagonal-phase NaGdF4：Nd^3＋, Yb^3＋, Tm^3＋ nanocrystals （NCs） with an average size of 21 nm were synthesized using a solvothermal approach. Nd^3＋, Yb^3＋, Tm^3＋ triple-doped NaGdF4 NCs exhibit a broad range of photoluminescence peaks covering a near infrared first/second window （860-900, 1,000, and 1,060 nm）, and visible emission including blue （475 nm）, green （520 and 542 nm） and yellow （587 nm） after excitation at 800 nm. A mechanism involving circulation of energy over Gd^3＋ sublattices as bridge ions and final trapping by the initial activator ions （Nd^3＋） has been proposed. Penetration depth studies indicate that NIR emission is easily detected even at a large tissue thickness of 10 mm. These paramagnetic nanophosphors demonstrate a large magnetization value of 1.88 emu/g at 20 kOe and longitudinal relaxivity value of 1.2537 mM-1.S-1 as a Tl-weighted magnetic resonance imaging contrast agent. These NaGdF4：Nd^3＋, Yb^3＋ Tm^3＋ NCs are promising for applications in biological and magnetic resonance imaging.

摘要：The?mine geostress measurement is the indispensable key to safe and efficient production of the mine. Currently, stress relief method, hydraulic fracturing method and acoustic emission method are widely used in mine geostress test fields. As deficiencies of the above several methods, the author designed a detailed borehole acoustic program for the tectonic fault conditions of a mine in Huainan, and got geostress parameter values according to the combination of site measured velocity values and laboratory tests.

摘要：To investigate the impact of anaerobic soil disinfestation(ASD)treatment with different processing duration on tomato continuous cropping soil,a total of eight treatments were designed,which included two treatment temperatures of 10℃ and 30℃,and four treatment times of 3,4,5 and 7 weeks(w).The results showed that whether the temperature was 10℃ or 30℃,the pH values,TOC and available K contents in the soil treated by the ASD method were significantly increased(P<0.05),while the EC values and NO_(3)^(-)contents in soils treated by ASD were significantly reduced compared with the untreated group(P<0.05).The Fusarium oxysporum population in soils treated by ASD decreased with the extension of the treatment *** the treatment temperature was 30℃,the effect on the removal of the NO_(3)^(-)that had accumulated in soils treated by ASD was significantly better than the treatment temperature of 10℃(P<0.05).When soil was treated by ASD for more than 5 w at 30℃,the NH4+content in soil was significantly increased(P<0.05)compared with the untreated *** conclusion,NO_(3)^(-)accumulation in soils could not be completely eliminated with treatment by ASD,even when the treatment time at 10℃ was *** the treatment temperature was 10℃ or 30℃,the *** population in soils treated by ASD decreased significantly with the extension of the treatment time to more than 5 w compared with treatment only for only 3 w.

摘要：TiO_(2)-based materials have been considered as one of most promising alternatives for high-performance Li(Na)-ion batteries because of the low cost,simple composition,easy synthesis,good environmental protection,excellent safety and relatively high specific ***,the inferior electronic conductivity and poor ion diffusion coefficients are the biggest bottlenecks that restrict the popular *** effort has been focused on resolving these problems toward large-scale applications,and numerous significant advances have been *** the present work,a comprehensive overview of structure characteristics,electrochemical reaction mechanism and modification strategies of TiO_(2)-based materials was *** recent advances of various efficient ways for improving conductivity,Li(Na)storage capacity,rate capability and cycle stability are systematically summarized,including surface engineering,constructing composite and element doping,*** TiO_(2)-based materials with novel porous heterogeneous core-shell structures have been regarded as one of the most effective ways to resolve these ***,the future research directions and development prospects of TiO_(2)-based anode materials used in the manufacture of high-performance Li(Na)-ion batteries are *** review can provide important comprehension for the construction and optimization of highperformance of TiO_(2)-based anode materials.

摘要：目的调查相关营养评估指标与卒中后抑郁(poststroke depression,PSD)的关系,分析营养指标预测老年缺血性脑卒中患者发生PSD的表现,为护理人员早期识别PSD高危患者,优化脑卒中管理,改善预后提供参考依据。方法于2022年9月至2023年5月在深圳市1所医院神经内科选取239例老年缺血性脑卒中患者为研究对象。采用自行设计的问卷,收集患者一般人口学资料及疾病相关信息;采用白蛋白、微型营养评定简表(Mini Nutritional Assessment Short Form,MNA-SF)、老年营养风险指数(Geriatric Nutrition Risk Index,GNRI)评估患者的营养状况;采用医院焦虑抑郁量表的抑郁分量表(Hospital Anxiety and Depression Scale-Depression,HADS-D)评估卒中后抑郁情况。采用二元逻辑回归分析,分析卒中后抑郁相关影响因素,并采用受试者工作特征曲线分析方法比较营养指标的表现。结果老年缺血性脑卒中患者平均年龄为71.10±7.41岁,男性占66.5%(159/239),PSD发生率为32.6%(78/239)。不同营养指标的低值组PSD的发生率显著大于高值组,差异均具有统计学意义(P<0.05)。二元逻辑回归分析表明白蛋白(OR,0.681;95%CI,0.508~0.913,P=0.010)、GNRI(OR,1.238;95%CI,1.034~1.483,P=0.020)、MNA-SF(OR,0.708;95%CI,0.614~0.815,P<0.001)是影响PSD的因素(P<0.05)。白蛋白、GNRI和MNA-SF 3个指标联合预测老年缺血性脑卒中患者PSD的ROC曲线下面积最大,有较高的区分度(AUC,0.738;敏感度为75.6%,特异度为60.9%)。结论由白蛋白、GNRI、MNASF联合组成的营养评价指标可作为预测老年缺血性脑卒中营养不良患者发生PSD风险的辅助工具。需要护理人员在更多样化的患者群体中进行进一步的验证,以证明预测的准确性。

摘要：Wall-climbing robots can work on steep terrain and obtain environment information in three dimensions for human in real time,which can improve operation ***,traditional single-mode robots cannot ensure the stable attachment on complex wall *** by the structure characteristics of flies and clingfishes,three bionic structures including the flexible spine wheel,the adhesive material and the adsorption system are *** at task requirements on multiple walls and based on the above three bionic structures,a wall-climbing robot with the composed mode of“grabbing+adhesion+adsorption”is presented v/a the law of mechanism configuration *** static analysis,the safe attachment conditions for the robot on smooth and rough walls are that the adsorption force is 30 N or *** on Newton's Euler and Lagrange formulas,the dynamic equations of the robot on vertical walls are established to deduce that the maximum theoretical torque of the driving motor is 1.43 N·m at a uniform ***,the prototype of the wall-climbing robot is manufactured and tested on the vertical lime wall,coarse sandpaper wall and acrylic ceiling ***,experiment results imply that the average maximum moving speed and the corresponding load are 7.19 cm·s-1 and 0.8 kg on the vertical lime wall,7.78 cm·s-1 and 0.6 kg on the coarse sandpaper wall,and 5.93 cm·s-1 and 0.2 kg on the acrylic ceiling wall *** findings could provide practical reference for the robot’s application on walls.

摘要：Laser powder bed fusion(LPBF)makes it possible for biodegradable zinc(Zn)to be used to produce customized orthopedic *** this research,we investigate the impact of laser power and scanning speed on the development of surface quality,relative densification,and texture during LPBF of Zn *** laser power was able to decrease melt viscosity and surface tension,which improved the metallurgical bonding between adjacent *** and twisted tracks also became continuous and *** speed could controlmolten-pool temperature to restrain grain natural orientation,achieving various crystal orientations and a weakened ***,it further avoided the thermal expansion and contraction caused by excessive energy storage and accumulation in the matrix,thus reducing the generation of high-dislocation *** a result,by selecting a reasonable laser power and scanning speed,the LPBF parts exhibited a flat surface morphology and a high density over 99.5%.Their average hardness,mechanical strength,and elongation reached 50.2 HV,127.8 MPa,and 7.6%,***,the parts displayed a moderate degradation rate and excellent osteogenic *** these results provide a basis for selecting process parameters to optimize the comprehensive properties of LPBF-processed Zn parts for biodegradable applications.