Doping Copper Ions in a Metal-Organic Framework(UiO-66-NH2):Location Effect Examined by Ultrafast Spectroscopy

We constructed two types of copper-doped metal-organic framework(MOF),i.e.,Cu@UiO-66-NH2 and Cu-UiO-66-NH2.In the former,Cu2+ions are impregnated in the pore space of the amine-functionalized,Zr-based UiO-66-NH2;while in the latter,Cu^2+ions are incorporated to form a bimetal-center MOF,with Zr^4+being partially replaced by Cu2+in the Zr-O oxo-clusters.Ultrafast spectroscopy revealed that the photoinduced relaxation kinetics associated with the ligand-to-cluster charge-transfer state is promoted for both Cudoped MOFs relative to undoped one,but in a sequence of Cu-UiO-66-NH2>Cu@UiO-66-NH2>UiO-66-NH2.Such a sequence turned to be in line with the trend observed in the visible-light photocatalytic hydrogen evolution activity tests on the three MOFs.These findings highlighted the subtle effect of copper-doping location in this Zr-based MOF system,further suggesting that rational engineering of the specific metal-doping location in alike MOF systems to promote the photoinduced charge separation and hence suppress the detrimental charge recombination therein is beneficial for achieving improved performances in MOF-based photocatalysis.

Accurate Fault Location Modeling for Parallel Transmission Lines Considering Mutual Effect

:A new accurate algorithms based on mathematical modeling of two parallel transmissions lines system(TPTLS)as influenced by the mutual effect to determine the fault location is discussed in this work.The distance relay measures the impedance to the fault location which is the positive-sequence.The principle of summation the positive-,negative-,and zero-sequence voltages which equal zero is used to determine the fault location on the TPTLS.Also,the impedance of the transmission line to the fault location is determined.These algorithms are applied to single-line-to-ground(SLG)and double-line-to-ground(DLG)faults.To detect the fault location along the transmission line,its impedance as seen by the distance relay is determined to indicate if the fault is within the relay’s reach area.TPTLS under study are fed from one-and both-ends.A schematic diagrams are obtained for the impedance relays to determine the fault location with high accuracy.

Experimental study on influence of boundary on location of maximum velocity in open channel flows

The velocity dip phenomenon may occur in a part of or in the whole flow field of open channel flows due to the secondary flow effect. Based on rectangular flume experiments and the laser Doppler velocimetry, the influence of the distance to the sidewall and the aspect ratio on the velocity dip is investigated. Through application of statistical methods to the experimental results, it is proposed that the flow field may be divided into two regions, the relatively strong sidewall region and the relatively weak sidewall region. In the former region, the distance to the sidewall greatly affects the location of maximum velocity, and, in the latter region, both the distance to the sidewall and the aspect ratio influence the location of the maximum velocity.

Depressing effect of phenoxyl acetic acids on flotation of minerals containing Ca^(2+)/Mg^(2+) gangues

Phenoxyl acetic acids were applied to determine their depressing effect on minerals containing Ca2+/Mg2+ gangues. Calcite, mixture of calcite and fluorite, and nickel ore were used in the flotation. And the depression mechanism was studied by the determination of contact angle, zeta potential, adsorptive capacity of collector, and IR analysis as well. It is found that 0.1 mmol/L of phenoxyl acetic acid derived from pyrogallol or gallic acid exhibits strong depressing ability on calcite in almost zero yields at pH value of 9.8, and calcite can be depressed in the flotation of calcite/fluorite mixture for approximate 87% yield of fluorite. The flotation result of practical nickel ore containing serpentine indicates that these two depressants may also show better depression performance to serpentine than traditional depressants such as sodium fluosilicate and carboxylmethyl cellulose. Analysis for the depression mechanism reveals that there exists strong chemical interaction between the depressants and minerals.

An online fast multi-track locating algorithm for high-resolution single-event effect test platform

To improve the efficiency and accuracy of single-event effect(SEE)research at the Heavy Ion Research Facility at Lanzhou,Hi’Beam-SEE must precisely localize the position at which each heavy ion hitting the integrated circuit(IC)causes SEE.In this study,we propose a fast multi-track location(FML)method based on deep learning to locate the position of each particle track with high speed and accuracy.FML can process a vast amount of data supplied by Hi’Beam-SEE online,revealing sensitive areas in real time.FML is a slot-based object-centric encoder-decoder structure in which each slot can learn the location information of each track in the image.To make the method more accurate for real data,we designed an algorithm to generate a simulated dataset with a distribution similar to that of the real data,which was then used to train the model.Extensive comparison experiments demonstrated that the FML method,which has the best performance on simulated datasets,has high accuracy on real datasets as well.In particular,FML can reach 238 fps and a standard error of 1.6237μm.This study discusses the design and performance of FML.

Correlation between current intensity and effective duration in the treatment of botulinus toxin for cerebral palsy by myoelectricity locating

BACKGROUND： Researches prove that the treatment of cerebral palsy by botulinus toxin （BTX-A） can improve effect and prolong effective duration. Current intensity is the important factor during injection. OBJECTIVE： To observe the changes of motor function and muscular intensity of children with spastic cerebral palsy after injecting BTX-A and analyze correlation between current intensity and effective duration. DESIGN： Cases control trial before and after nerves block SETTING： Capital University of Medical Sciences, China Rehabilitation Research Center PARTICIPANTS： From June 2002 to November 2004, 14 children with spastic cerebral palsy were treated by BTX-A block. All children were hospitalized in the Children Rehabilitation Department of China Rehabilitation Research Center. The children included 9 male and 5 female, and ranged from 4 to 13 years old, and average age was （6±2） years. Muscular tension ranged from grade 1 to grade 3. The diagnosis and the tape of cerebral palsy based on standard of the Fist Nationwide Cerebral Palsy Symposium, and all children were diagnosed with electroencephalogram （EEG）, CT and MRI, and permitted by their guardians. METHODS： （1） Locating and calculation： To locate block points by G6805-2A electro-therapeutic apparatus （Shanghai Huayi Electronic Instrument Plant） at the least stimulating current （continuous wave; impulse frequency; 2.667-83.333 Hz; current intensity： 0-6 mA; voltage： 6 V） to touch off muscles contraction. The current intensity of each point was recorded, and the average current intensity of each patient was calculated at the same time. （2） Dose of BTX-A： Basing upon the spastic degree and weight of patients, the dose was made certain： dose （IU）=（scores of Modified Ashworth Scale ＋2.5） xweight （kg）. The number of the block points was in all 4. The dose of injection ranged from 50 IU to 160 IU with the average of （73.6＋25.8） IU. The BTX-A was made by Lanzhou Institute of Biological Products, and each bottle contains 100 IU BTX-A. Muscular tension was evaluated by Modified Ashworth Scale. The scale ranged from grade 0 to grade 4, and the scores were from 0 to 4. The higher the scores were, the higher the muscular tension was. （3） Effect： Changes of muscular tension were evaluated by modified Ashworth Scale before and after block. Motor function was evaluated by Physician Rating Scale （PRS） before and after treatment. It contained Gait pattern, Hindfoot （ankle） position （stance-floor contact）, Hindfoot position （foot strike）, Knee position （degree of recurvation）, Crouch and Speed of gait. The scores ranged from 0 to 14. The higher the points were, the better the motor function was. （4） Effective duration： The duration was definited by the recovering of the Modified Ashworth Scale. （5） Statistic analysis： Firstly, the current intensity and the effect duration were analyzed by One-Sample Kolmogorov-Smirnov Test, the current intensity： Z= 0.456, P= 0.985, the effective duration： Z= 0.557, P= 0.915. Both data were normal distribution. Secondly, both data were analyzed by Linear Regression. The efficiency of the BTX-A block was analyzed by paired-samples t test. MAIN OUTCOME MEASURES： （1） Changes of motor function of muscular tension; （2） correlation between current intensity and effective duration. RESULTS： Fourteen children with spastic cerebral palsy were all involved in the final analysis. （1） Therapeutic effect： The average score of Ashworth scale after block was lower than that before block [（1.02±0.34） points vs. （2.12±0.48） points, t= 3.644, P〈 0.01]. The average score of RPS after block was higherthan that before block [（9.75±2.78） points vs. （6.16±0.58） points, t =13.222, P〈 0.01]. （2） Relation between the current intensity and the effective duration： The current intensity was （0.1857±0.0506） mA, and the effective duration was （26.36±4.48） weeks. The current intensity was negative correlation with effective duration （r = -0.775, P = 0.01 ）. CONCLUSION： （1） BTX-A occlusion can decrease muscular tension and improve motor function of lower limbs of children with spastic cerebral palsy. （2） The lower the current intensity is, the longer the effective duration is.

Effect and mechanism of on-chip electrostatic discharge protection circuit under fast rising time electromagnetic pulse

The electrostatic discharge(ESD)protection circuit widely exists in the input and output ports of CMOS digital circuits,and fast rising time electromagnetic pulse(FREMP)coupled into the device not only interacts with the CMOS circuit,but also acts on the protection circuit.This paper establishes a model of on-chip CMOS electrostatic discharge protection circuit and selects square pulse as the FREMP signals.Based on multiple physical parameter models,it depicts the distribution of the lattice temperature,current density,and electric field intensity inside the device.At the same time,this paper explores the changes of the internal devices in the circuit under the injection of fast rising time electromagnetic pulse and describes the relationship between the damage amplitude threshold and the pulse width.The results show that the ESD protection circuit has potential damage risk,and the injection of FREMP leads to irreversible heat loss inside the circuit.In addition,pulse signals with different attributes will change the damage threshold of the circuit.These results provide an important reference for further evaluation of the influence of electromagnetic environment on the chip,which is helpful to carry out the reliability enhancement research of ESD protection circuit.

带邻近作用的高增益率co-location模式挖掘

大多数空间co-location模式挖掘将距离阈值作为衡量不同对象实例间邻近关系的标准,进而挖掘出频繁co-location模式,并没有考虑具有邻近关系的实例间的相互影响和模式的增益率问题。在空间co-location模式挖掘过程中,引入实例间的相互作用率和对象的季均收益,定义了对象作用率、套间总收益和增益率等概念,并提出挖掘高增益率co-location模式的基础算法(NAGA)和有效的剪枝算法(NAGA_JZ)。最后通过大量的实验来验证基础算法的正确性和实用性,并对基础算法和剪枝算法的挖掘效率进行了对比,验证了剪枝算法的高效性。

Scale effect removal and range migration correction for hypersonic target coherent detection

The detection of hypersonic targets usually confronts range migration(RM)issue before coherent integration(CI).The traditional methods aiming at correcting RM to obtain CI mainly considers the narrow-band radar condition.However,with the increasing requirement of far-range detection,the time bandwidth product,which is corresponding to radar’s mean power,should be promoted in actual application.Thus,the echo signal generates the scale effect(SE)at large time bandwidth product situation,influencing the intra and inter pulse integration performance.To eliminate SE and correct RM,this paper proposes an effective algorithm,i.e.,scaled location rotation transform(ScLRT).The ScLRT can remove SE to obtain the matching pulse compression(PC)as well as correct RM to complete CI via the location rotation transform,being implemented by seeking the actual rotation angle.Compared to the traditional coherent detection algorithms,Sc LRT can address the SE problem to achieve better detection/estimation capabilities.At last,this paper gives several simulations to assess the viability of ScLRT.

Locator附着体、球帽附着体在种植体覆盖义齿修复中的应用及对咀嚼功能、美学效果的影响比较

目的:比较Locator附着体、球帽附着体在种植体覆盖义齿修复中的应用及对咀嚼功能、美学效果的影响。方法:选择2017年1月-2019年12月笔者医院就诊的100例下颌无牙颌患者为研究对象,种植体覆盖义齿修复中采用Locator附着体的50例患者为A组、采用球帽附着体的50例患者为B组,比较两组治疗后6个月时种植体周围软组织健康状况、咀嚼功能、美学效果及并发症发生情况,其中周围软组织健康状况指标包括边缘骨吸收值(BML)、菌斑指数(PLI)、牙周袋探诊深度(PPD),牙龈指数(GI),咀嚼功能指标包括咀嚼次数、咀嚼效果及语音清晰度,美学修复效果包括修复体完整、边缘适宜、染色A级率及患者对面部形态的满意率。结果:治疗后6个月,两组种植体周围软组织健康状况均良好,组间BML、PLI、PPD、GI比较差异均无统计学意义(P>0.05);A组咀嚼次数、咀嚼效率显著高于B组,语音清晰度显著高于B组,组间比较差异均有统计学意义(P<0.05);A、B组的修复体完整A级率比较,差异无统计学意义(P>0.05),A组边缘适宜A级率、染色A级率及患者对面部形态满意率显著高于B组,组间比较差异均有统计学意义(P<0.05);A、B组并发症发生率分别为4.0%、16.0%,A组显著低于B组,差异有统计学意义(P<0.05)。结论:Locator附着体在种植体覆盖义齿修复中的应用效果更佳,在保证种植体周围软组织健康状况的同时,能更好地提高咀嚼功能、美学效果,并且并发症更少,是安全、有效的临床方案。

Ce-modified USY zeolite catalysts for catalytic oxidation of chlorinated VOCs:Effect of the location of CeO_(2) and its synergistic effect with USY zeolite

The catalytic behavior of a catalyst for chlorine-containing volatile organic compounds(CVOCs) oxidation largely depends on the synergistic interaction between the oxidizing and acidic sites.In the present work,two catalysts with different distributions of CeO_(2) on the inner and outer surfaces of 4.0Ce-USY-ex and 4.0Ce-USY-dp(USY zeolite) were prepared respectively by ion exchange and deposition methods,with a purpose of finding out how the location of the oxidation sites(CeO_(2)) influence its synergistic effect with the acidic sites of zeolite.The results show that 4.0Ce-USY-ex is much more active for catalytic degradation of 1,2-dichloroethane(DCE),while 4.0Ce-USY-dp catalyst exhibit higher catalytic degradation activity for other structured CVOCs(dichloromethane(DCM),trichloroethylene(TCE),chlorobenzene(CB)).CeO_(2) in 4.0Ce-USY-ex catalyst mainly disperses in the pore channels of USY zeolite,and there are many strong acid centers on the surface,which is conducive to the dechlorination conversion of CVOCs.However,CeO_(2) in 4.0Ce-USY-dp catalyst is mainly distributed on the outer surface of USY and has strong oxidation ability,which contributes to the deep oxidation of CVOCs.Moreover,the presence of a large number of strong acid centers on the catalyst surface of 4.0Ce-USY-ex catalysts leads to severe accumulation of surface carbon species and significantly decreases its stability towards DCE.However,a large number of active oxygen species on the surface of 4.0Ce-USY-dp and CeO_(2) catalysts are beneficial to the deep oxidation of DCE,reducing the formation of surface carbon and thus improving the stability of the catalyst.Thus,the influence of the location of the oxidation sites on its synergistic effect with the acidic sites was established in the present work,which could provide some new ideas for the rational design of CVOCs degradation catalyst with appropriate distribution of active sites.

Employment Effect of the Resource-abundant Industrial Cluster in Southwestern Region of Guangxi Zhuang Autonomous Region of China——A Case of Chongzuo City

Taking Chongzuo City of Guangxi Zhuang Autonomous Region as an example, the employment effect of the resource-abundant industrial cluster in southwestern Guangxi Province is analyzed according to the data from the Chongzuo Statistical Yearbook , Guangxi Statistical Yearbook from 2003 to 2008 and the data from the relevant sections of Chongzuo City, and the four employment effects of industrial cluster--the spatial expansion effect of employment chain, optimizing effect of employment structure, the multiplier effect of employment absorption and the effect of improving the quality of labors and the degree of the intensity of employment and location quotient of employment. Results show that the employment absorption of sugar industry in Chongzuo City is stable and upward slightly, and it shows strong employment effect; the sugar industry in Chongzuo is not only competitive, but also has a great share of market in employment, so it owns strong absorption of employment. The countermeasures for improving the employment level of resource-abundant and industrial cluster in southwest of Guangxi Province are put forward, including elongating industrial chain and widening employment space; strengthening various kinds of formal and informal training to improve the employment capability of laborers; laying stress on industrial structure and optimizing the employment structure; strengthening the construction of the industrial economic zone towards ASEAN(Association of Southeast Asian Nations), and fully displaying the regional advantages of the offshore border.

LOCATING MECHANISM STUDY OF SEVERAL TYPES OF GOLD DEPOSITS

Based on the availabities of three orecontrolling factors, theauthors put forword the locating mechanism of gold deposits. The model experiment indicates that the pressurerelease effect occuring during the locating process marks the metallogenic nonlinear effect and causes the formation of deposits. In addition, the deposits involved in this paper can be divided into four kinds of locating mode.

Negative effects of artiffcial nest boxes on birds:A review

Artificial nest boxes are placed to attract birds to nest and breed in a specific location,and they are widely used in avian ecology research and in the attraction of insectivorous birds.There is evidence that artificial nest boxes can adversely affect breeding fitness but no great focus has been placed on this issue by researchers.Therefore,we retrieved 321 research papers regarding artificial nest boxes published from 2003 to 2022 and used the'Biblioshiny'program to extract and integrate keywords;we then summarized the adverse effects of artificial nest boxes on avian breeding success.The studies highlighted many drawbacks and misuses in the designing and placement of nest boxes;furthermore,bird attraction was decreased by their inappropriate selection,thus reducing breeding success.Regarding nest box production,there were shortcomings in the construction material,color,smell,and structural design of the boxes used.Nest boxes were also placed at inappropriate densities,locations,orientations,heights,and managed incorrectly.Finally,we propose suggestions for more efficient and safer artificial nest boxes for future use in avian ecology research and bird conservation.

基于改进混合密度网络的毁伤效应预测方法

提出一种基于改进混合密度神经网络的毁伤效应预测方法,解决了现有智能毁伤效应预测方法中仅能输出点预测结果,但难以量化毁伤效应预测结果的不确定性问题。采用鲁棒性更好的t分布作为混合分量,利用混合密度网络生成概率密度函数,以反映毁伤效应预测中的不确定性,并根据给定置信水平获得区间预测结果。仿真实验表明,获得的概率密度函数可以较为准确地拟合蒙特卡洛仿真模拟结果,与现有的毁伤效应预测方法相比,可以更好地指导作战筹划。

城市市场需求对企业布局的诱致影响研究

随着市场分工的不断深化,城市市场逐渐成为功能完备的独立市场单元。企业布局的区位选择是遵循利润最大化做出微观决策的空间分布结果,在不同城市市场中呈现差异化的布局特征。以2000—2021年304个城市的新注册企业与上市公司为研究对象,考察城市市场需求对企业布局的诱致影响、作用机制及区域异质性,并实证检验需求距离在其中的调节作用。实证结果表明:需求规模大的城市市场更有利于吸引新企业进入布局。机制分析表明,劳动力“蓄水池”、中间品共享和技术溢出效应是城市市场诱致企业布局的三个重要渠道。大规模城市、省会城市、东部城市及高度市场化城市的市场需求对于企业进入布局的诱致作用更强,具有典型的路径依赖性。针对此类城市,除招商优惠政策外,地方政府更需要考虑城市市场正外部性的综合理念提升市场环境,亟须防范新企业因模仿与重复布局导致的市场效率降低。需求距离的调节效应表明,城市市场需求中心对企业的诱致作用在6公里范围内显著。企业邻近城市中心的布局方式有利于要素获取,从而显著提高企业生存概率,但应注意防范城市市场的“拥挤效应”。因此,实施差异化的市场准入政策有利于各地城市市场发展的协调性与均衡性,有利于扩展城市市场需求规模以及推行招商优惠政策。

基于主动探测原理的直流配电线路短路故障测距

为克服对端系统助增作用的影响,实现直流配电线路短路故障的准确测距,提出一种主动探测式的故障测距原理。故障发生后,设计限流策略限制短路电流,进而切换至主动探测控制策略下,向直流线路注入特征频率探测信号。根据特征频率下故障等效电路的激励与响应特性,构建故障测距方程,实现了基于故障分析法的单端量故障测距。基于PSCAD电磁暂态仿真软件搭建了对应模型,仿真验证了不同故障位置和故障过渡电阻情况下测距原理的性能,采用特征频率探测信号构建测距方程,克服了对端电源助增作用的影响,测距结果的相对误差在0.5%以内。

乳腺组织定位标记夹在乳腺癌新辅助化疗中的应用效果

目的探讨乳腺组织定位标记夹在乳腺癌新辅助化疗中的应用效果。方法选取2020年8月至2022年8月九江市第一人民医院乳腺科收治的60例乳腺癌新辅助化疗患者作为研究对象,按照随机数字表法将患者分为对照组(30例)与试验组(30例),其中对照组在新辅助化疗后行术前导丝定位乳腺病灶,试验组则在新辅助化疗前放置乳腺组织定位标记夹,完成病灶定位后由同一治疗组医师进行手术治疗。对两组保乳手术率、保乳切缘阴性率、前哨淋巴结活检率、病理评估准确率进行比较,同时比较两组引流管留置时间、住院时间和住院费用。结果试验组保乳手术率、保乳切缘阴性率、前哨淋巴结活检率、病理评估准确率均高于对照组,差异有统计学意义(P<0.05);试验组手术时间、引流管留置时间和住院时间短于对照组,住院费用低于对照组,差异有统计学意义(P<0.05)。结论乳腺组织定位标记夹应用在乳腺癌新辅助化疗中,能精准定位乳腺原发灶及腋窝转移淋巴结,改善乳腺癌患者预后,可获得较好的社会和经济效益,在临床上值得应用和推广。

为什么大量高效率企业留在中小城市?——基于位置效应与异质性企业生产率的一个解释

针对现实中大量高效率企业留在中小城市这一与异质性区位理论预测明显矛盾的现象,本文提出位置效应假说,即高效率企业之所以留在中小城市是因为其在当地的经济地位排序更靠前,而靠前的位置排序在信号机制的作用下,使其能在融资、用工、上下游供应链中获得优势。本文基于中国工业企业数据的检验结果表明,以企业销售额为指标对城市内企业进行位置排序,排序靠前能显著提高企业的生产率。在控制企业规模、行业和城市自身特征等诸多因素,并通过构造复合工具变量控制内生性之后,结论仍然成立。本文结论为地区差别化优惠政策提供了理论支持,即在相对落后地区重点补贴位置排序靠前的企业,可以进一步增强该“位置”对高效率企业的吸引力,比均等补贴所有企业更有利于促进该地区的发展。

大倾角煤层中煤层气井压降传播规律

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