A New Type of Power Clock for DSCRL Adiabatic Circuit

An asymmetry power clock,4 phase power clock supplying the power to the DSCRL(dual swing charge recovery logic) adiabatic circuit is presented.It is much simpler than the 6 phase power clock,symmetry power clock,used in the DSCRL adiabatic circuit.Although the 4 phase power clock is simpler,the DSCRL adiabatic circuit still shows good performance and high efficiency of energy transfer and recovery.This conclusion has been proved by the result of the HSPICE simulation using the 0 6μm CMOS technology.

Research on Relationship between Recovery Ability after Drought Stress-rewatering and Water Use Efficiency of Winter Wheat Varieties

The study aims at exploring the possibility of using the recovery ability af- ter drought stress-rewatering at vegetative growth stage as the evaluating index in water use efficiency （WUE） of winter wheat varieties. ＇Jing 411 ＇, ＇Jinmai 47＇ and their 34 near isogenic lines （NILs） were used as test materials. Semi-automatic rainproof shelter and the percolating pools were used for simulating drought treat- ment. After suffering severe drought stress, winter wheat crops were rewatered at early jointing stage. The biomass accumulation after rewatering was determined as recovery ability index. In the meanwhile, plant height in the end of vegetative growth stage was measured, and WUE of varieties/lines was also determined. Thereafter, the differences in recovery ability, plant height and the population WUE, together with the correlation between recovery ability and population WUE were analyzed, respectively. The results showed that there were significant differences in recovery ability among some varieties/lines. The recovery ability was affected by both geno- type and environment, and the interaction existed in these two factors. Significant differences existed in plant height and population WUE among the 34 NILs along with their parents. There was a significantly positive correlation between recovery ability and plant height of varieties/lines. Recovery ability and plant height were very significantly and positively correlated with population yield WUE respectively. The re- sults indicated that recovery ability after drought stress-rewatering could be used as an evaluating index of population WUE under drought condition.

两地三中心容灾备份系统建设及成效

随着人民银行省级数据中心建设的不断深入,以及信息化系统整合趋势的不断发展,人行省级数据中心部署了全省大量业务系统,但信息系统数据存储安全存在一定风险,灾备级别较低。为此人民银行南京分行根据现有存储、网络资源,在对比分析了3种较为成熟的灾备方案后,采用了EMC Vplex Metro&Recoverpoint Crr方案开展两地三中心容灾备份系统建设,并取得了一定成效,为进一步提升人民银行南京分行省级数据中心的灾备水平及为省级数据中心系统提供更加全面可靠的保护打下了良好的基础。

医院计算机应用中硬盘数据修复探讨

介绍医院在计算机应用过程中,修复硬盘丢失数据的一些方法和实例分析。

金融衍生工具风险管理的若干问题

金融衍生工具风险管理的若干问题□江曙霞金融衍生工具风险监管的国际合作早办８０年代就已经开始。１９８８年７月，国际银行业的重要的监管常设机构＂巴塞尔委员会＂颁布的《巴塞尔报告》即对利率合约和汇率合约的资本标准作出明确规定；１９９４年７月，＂巴塞尔委员会...

计算机技术基础讲座(连载二十三·完) 第十讲 计算机常用工具软件

2常用工具软件（接上期） 4）数据恢复软件Easy recover 计算机在使用过程中难免会遇到误删除、误格式化、中毒、系统崩溃等情况，致使一些重要数据或文件丢失。

Distribution and resource evaluation of natural gas hydrate in South China sea by combing phase equilibrium mechanism and volumetric method

China Geological Survey conducted the second trial production of natural gas hydrate(NGH)in the Shenhu Area in South China Sea(SCS)from 2019 to 2020.Compared with the first trial production in 2017,the second trial showed significantly increased daily gas production and total gas production,and removed some technical obstacles for large-scale NGH resource developments in the SCS.However,current NGH resource evaluation in the SCS is still at the stage of prospective gas content assessment,which is unable to guide further NGH exploration and development.This study utilized the hydrate phase balance to delineate the NGH distribution range and effective thickness and volumetric method to evaluate NGH resource.Based on the latest exploration and production data from the Shenhu Area,Monte Carlo simulation was performed to calculate the NGH resource amount with different probabilities.By assuming a 50%cumulative probability,the in-situ NGH resources in the SCS was estimated to be11.7×10^(12)m^(3) and the recoverable NGH resources was 2.8×10^(12)m^(3).These results will provide a more reliable resource basis for China to formulate comprehensive development strategies for oil and gas exploration in the SCS.

Effect of docosahexaenoic acid on the recovery of motor function in rats with spinal cord injury: a meta-analysis

Objective:Studies have shown that docosahexaenoic acid(DHA)has a beneficial effect in the treatment of spinal cord injury.A meta-analysis was used to study the effect of DHA on the neurological recovery in the rat spinal cord injury model,and the relationship between the recovery of motor function after spinal cord injury and the time and method of administration and the dose of DHA.Data source:Published studies on the effect of DHA on spinal cord injury animal models from seven databases were searched from their inception to January 2019,including PubMed,MEDLINE,EMBASE,the China National Knowledge Infrastructure,Wanfang,VIP,and SinoMed databases.The search terms included“spinal cord injury”“docosahexaenoic acid”,and“rats”.Data selection:Studies that evaluated the influence of DHA in rat models of spinal cord injury for locomotor functional recovery were included.The intervention group included any form of DHA treatment and the control group included treatment with normal saline,vehicle solution or no treatment.The Systematic Review Centre for Laboratory animal Experimentation’s risk of bias assessment tool was used for the quality assessment of the included studies.Literature inclusion,quality evaluation and data extraction were performed by two researchers.Meta-analysis was then conducted on all studies that met the inclusion criteria.Statistical analysis was performed on the data using RevMan 5.1.2.software.Outcome measures:The primary outcome measure was the score on the Basso,Beattie,and Bresnahan scale.Secondary outcome measures were the sloping plate test,balance beam test,stair test and grid exploration test.Results:A total of 12 related studies were included,3 of which were of higher quality and the remaining 9 were of lower quality.The highest mean Basso,Beattie,and Bresnahan scale score occurred at 42 days after DHA treatment in spinal cord injury rats.At 21 days after treatment,the mean difference in Basso,Beattie,Bresnahan scores between the DHA group and the control group was the most significant(pooled MD=4.14;95%CI=3.58–4.70;P<0.00001).In the subgroup analysis,improvement in the Basso,Beattie,and Bresnahan scale score was more significant in rats administered DHA intravenously(pooled MD=2.74;95%CI=1.41–4.07;P<0.0001)and subcutaneously(pooled MD=2.99;95%CI=2.29–3.69;P<0.00001)than in the groups administered DHA orally(pooled MD=3.04;95%CI=–1.01 to 7.09;P=0.14).Intravenous injection of DHA at 250 nmol/kg(pooled MD=2.94;95%CI=2.47–3.41;P<0.00001]and 1000 nmol/kg[pooled MD=3.60;95%CI=2.66–4.54;P<0.00001)significantly improved the Basso,Beattie,and Bresnahan scale score in rats and promoted the recovery of motor function.Conclusion:DHA can promote motor functional recovery after spinal cord injury in rats.The administration of DHA by intravenous or subcutaneous injection is more effective than oral administration of DHA.Intravenous injection of DHA at doses of 250 nmol/kg or 1000 nmol/kg is beneficial.Because of the small number and the low quality of the included studies,more high-quality research is needed in future to substantiate the results.

Pig farmers’ willingness to recover their production under COVID-19 pandemic shock in China-Empirical evidence from a farm survey

Pig farmers’willingness to recover production under the COVID-19 pandemic shock is significant to recover live pigs’supply in China in 2020.Increasing farmers’willingness to recover pig production contributes to enhance pig supply,stabilize the pig and pork market,and to improve pig farmers’income.This research studies the determinants of pig farmers’willingness to recover production under COVID-19 pandemic shock by applying survey data of 201 farmers in Huai’an City and Lin’an City and a logit regression model.The estimation results show that a farmer’s risk perception,the duration time of a farmer’s feed supply under COVID-19 pandemic shock,whether or not being a cooperative member,and a farmer’s knowledge on government’s policy designed to encourage pig production,a farmer’s education level and production experience are the key determinants to a farmer’s willingness to recover pig production.Thus,it’s important for policymakers to solve the problems for farmers to get access to feed during the pandemic,to encourage the development of cooperatives,as well as to issue and advocate policies to encourage pig production.The study contributes to the scant literature by providing fresh empirical evidences on determinants of farmers’willingness to recover pig production.It has significance to farmers and governments to enhance farmers’willingness to recover production,which contributes to secure pig supply in China after the COVID-19 pandemic.

Removing the remaining ridges in fingerprint segmentation

Fingerprint segmentation is an important step in fingerprint recognition and is usually aimed to identify non-ridge regions and unrecoverable low quality ridge regions and exclude them as background so as to reduce the time expenditure of image processing and avoid detecting false features. In high and in low quality ridge regions, often are some remaining ridges which are the afterimages of the previously scanned finger and are expected to be excluded from the foreground. However, existing seg-mentation methods generally do not take the case into consideration, and often, the remaining ridge regions are falsely classified as foreground by segmentation algorithm with spurious features produced erroneously including unrecoverable regions as fore-ground. This paper proposes two steps for fingerprint segmentation aimed at removing the remaining ridge region from the fore-ground. The non-ridge regions and unrecoverable low quality ridge regions are removed as background in the first step, and then the foreground produced by the first step is further analyzed for possible remove of the remaining ridge region. The proposed method proved effective in avoiding detecting false ridges and in improving minutiae detection.

新课程下的高中英语词汇教学技巧分析

词汇是组成英语语句的基本单元,其直接关乎学生英语学习的整体质量。然而,单纯的英语单词讲授和背诵很容易使学生感觉枯燥、乏味,会逐渐丧失学习的兴趣,甚至会产生厌学的负面情绪,影响课程教学的效果。本文以高中英语词汇教学为研究对象,着重就其开展策略进行了探究。一、明确词汇规律,增强记忆效果在现阶段高中英语词汇教学的过程中,很多教师都是让学生通过反复的诵读和背诵来达到记忆单词词汇的目的。

Connotation and strategic role of in-situ conversion processing of shale oil underground in the onshore China

In-situ conversion processing (ICP) of shale oil underground at the depth ranging from 300 m to 3 000 m is a physical and chemical process caused by using horizontal drilling and electric heating technology, which converts heavy oil, bitumen and various organic matter into light oil and gas in a large scale, which can be called"underground refinery". ICP has several advantages as in CO2capture, recoverable resource potential and the quality of hydrocarbon output. Based on the geothermal evolution mechanism of organic materials established by Tissot et al., this study reveals that in the nonmarine organic-rich shale sequence, the amount of liquid hydrocarbon maintaining in the shale is as high as 25%in the liquid hydrocarbon window stage (R o less than 1.0%), and the unconverted organic materials (low mature-immature organic materials) in the shale interval can reach 40%to 100%. The conditions of organic-rich shale suitable for underground in-situ conversion of shale oil should be satisfied in the following aspects, TOC higher than 6%, R o ranging between 0.5%and 1%, concentrated thickness of organic-rich shale greater than 15 meters, burial depth less than 3 000 m, covering area bigger than 50 km2, good sealing condition in both up-and down-contacting sequences and water content smaller than 5%, etc. The shale oil resource in China’s onshore region is huge. It is estimated with this paper that the technical recoverable resource reaches 70-90 billion tons of oil and 60-65 trillion cubic meters of gas. The ICP of shale oil underground is believed to be a fairway to find big oil in the source kitchen in the near future. And it is also believed to be a milestone to keep China long-term stability of oil and gas sufficient supply by putting ICP of shale oil underground into real practice in the future.

Optical encryption scheme based on ghost imaging with disordered speckles

An optical encryption scheme based on a ghost imaging system with disordered speckles is proposed to obtain a higher security with a small key. In the scheme, Alice produces the random speckle patterns and obtains the detection results with the help of a computational ghost imaging（CGI） system. Then Alice permutes the order of the random speckle patterns and shares the permutation sequence as a secure key to the authorized users. With the secure key, Bob could recover the object with the principle of the CGI system, whereas, the unauthorized users could not obtain any information of the object. The numerical simulations and experimental results show that the proposed scheme is feasible with a small key, simultaneously,it has a higher security. When the eavesdropping ratio（ER） is less than 40%, the eavesdropper cannot acquire any useful information. Meanwhile, the authorized users could recover completely with the secure key.

In-situ synchrotron X-ray diffraction investigation on deformation behavior of Nb/NiTi composite during pre-straining process

The mechanisms responsible for deformation behavior in Nb/NiTi composite during pre-straining were investigated systematically using in-situ synchrotron X-ray diffraction, transmission electron microscopy and tensile test. It is shown that upon loading, the composite experiences elastic elongation and slight plastic deformation of B19′,B2 and β-Nb phases, together with the forward stress-induced martensitic(SIM) transformation from B2 to B19′. Upon unloading, the deformation mechanisms of the composite mainly involve elastic recovery of B19′, B2 and β-Nb phases,compression deformation of β-Nb phase and incomplete B19′→B2 reverse SIM transformation. In the tensile loading-unloading procedure, besides the inherent elastic deformation and SIM transformation, the(001) compound twins in B19′ martensite can also be conducive to the elastic deformation occurring in B19′-phase of the composite.Therefore, this composite can exhibit a large recoverable strain after unloading owing to the elastic deformation, and the partially reversible and consecutive SIM transformation together with the(001) compound twins.

Application of New Water Flooding Characteristic Curve in the High Water-Cut Stage of an Oilfield

The oil production predicted by means of the conventional water-drive characteristic curve is typically affected by large deviations with respect to the actual value when the so-called high water-cut stage is entered.In order to solve this problem,a new characteristic relationship between the relative permeability ratio and the average water saturation is proposed.By comparing the outcomes of different matching methods,it is verified that it can well reflect the variation characteristics of the relative permeability ratio curve.Combining the new formula with a reservoir engineering method,two new formulas are derived for the water flooding characteristic curve in the high water-cut stage.Their practicability is verified by using the production data of Mawangmiao and Xijiakou blocks.The results show that the error between the predicted cumulative oil production and production data of the two new water drive characteristic curves is less than the error between the B-type water drive characteristic curve and the other two water drive characteristic curves.It is concluded that the two new characteristic curves can be used to estimate more accurately the recoverable reserves,the final recovery and to estimate the effects of water flooding.

Microscale comprehensive evaluation of continental shale oil recoverability

This paper targets the shale oil reservoirs of middle to high maturity in four major basins of China,including the Permian Lucaogou Formation of the Jimsar Sag in the Junggar Basin,the Chang 73 Member of the Triassic Yanchang Formation in the Longdong area of the Ordos Basin,the Kong 2 Member of the Paleogene Kongdian Formation in Cangdong Sag of the Bohai Bay Basin,and the Qing 1 Member of the Cretaceous Qingshankou Formation in Changling Sag of the Songliao Basin.The key parameters of the shale oil reservoirs in the four basins,such as reservoirs effectiveness,oil content,crude oil movability,and fracability,have been revealed under identical experimental conditions using the same evaluation technical system,on the basis of technique development and integrated application of multi-scale spatial distribution depiction,effective connectivity calculation,movable oil assessment based on the charging effect,and simulation of fracture propagation during reservoir stimulation.This research overcomes insufficient resolutions of conventional analysis approaches and difficulties in quantitative evaluation,develops the evaluation method for resource recoverability of different types of shale oil,and gains insights into different types of shale oil via comparison.The results of experiments and comparative analysis show that there are significant differences in the endowment of continental shale oil resources in the four major basins in China.Among them,the Lucaogou Formation in the Junggar Basin has more effective shale reservoirs,the Chang 73 sub-member of the Ordos Basin has a comparatively good proportion of movable oil and the Kong 2 Member of the Bohai Bay Basin has the best fracability.These results can provide references and basis for choosing development plans and engineering techniques.

The Effect of Low Frequency Repetitive Transcranial Magnetic Stimulation Combined with Range of Motion Exercise on Paretic Hand Function in Female Patients after Stroke

Repetitive transcranial magnetic stimulation (rTMS) has recently been demonstrated to improve motor function after stroke. However, no study has yet tested the synergetic effects of physical exercise on rTMS in clinical settings. We investigated the effect of a 6-session course of low frequency rTMS on contralesional primary motor cortex combined with range-of motion (ROM) exercise on paretic hand function in female stroke patients. This was a single-blind study of the effects of rTMS with or without ROM exercise in female hemiplegic patients after stroke. All patients underwent rTMS on the contralesional primary motor cortex for 15 minutes and ROM exercise on the paretic hand. The cortical excitability determined by the amplitude and latency of the motor evoked potential (MEP) was measured in both first dorsal interosseous (FDI) muscles. We also evaluated arm function using Box and Block, arm reach, 9-hole pegboard, power grip, and pinch grip force tests. The rTMS-induced MEP amplitude of the paretic side significantly increased whereas the non-paretic side showed a decrease through every session. However, the MEP latency significantly increased on the non-paretic hand at post-rTMS with exercise, but a tendency of decrement on paretic hand at same application. Motor function showed improvement in the 9-hole pegboard and arm reach tests at post-rTMS with exercise on the paretic side compared with the non-paretic side. A significant correlation was especially noted between motor function and MEP on the paretic side of stroke patients. Low frequency rTMS with ROM exercise improved hand function after stroke. This may, in part, result in additional rehabilitation in stroke patients.

Advances in Assessment of Geothermal Resources of South America

Updated data for 1417 localities have been assembled for purposes of assessments of geothermal resources in South America. Analyses of these data sets have allowed improved estimates of geothermal resource base and recoverable resources for thirteen countries in the continent. The results obtained have also allowed identification of more than 20 crustal blocks where the resource base per unit area (referred to the accessible depth limit of 3 km) is in the range of 100 to 1000 Giga Joules, while the recoverable resources per unit area are in the range of 1 to 100 Giga Joules. Most of the high temperature resources occur within regions of recent tectonic activities in southern and central Chile, highlands regions in Bolivia, and several localities along the magmatic arc covering western Ecuador, central volcanic belt of Colombia and northern Venezuela. In addition, isolated pockets of geothermal resources have been identified along the eastern Andean belt of Peru. There are indications of occurrence of medium and low temperature geothermal resources at depths of 1 to 3 km in several regions in the eastern sectors of the continent, mainly in the northeastern and central parts of Brazil. In addition, considerable progress has been made in assessments of low temperature resources associated with deep fracture systems in Precambrian terrains. Progress has also been achieved in assessment of low temperature resources in deep aquifers of Paleozoic sedimentary basins. The results of such estimates are currently being considered for planning large-scale exploitation of the Guarani aquifer system, which spans over large areas of western Uruguay, northern Argentina and southern Brazil.

影响海洋运输货物航程的原因及其保险责任

影响海洋运输货物航程的原因及其保险责任□陆荣华，陈凯现代海洋运输货物保险责任的起讫是根据＂仓至仓＂（Ｗａｒｅｈｏｕｓｅｔｏｗａｒｅｈｏｕｓｅ）的原则，在海洋运输的基础上，扩展到装载海轮之前，以及卸载海轮之后，货物驳运和陆运等环节，１９８２年１月修订的...

Analysis of groundwater recoverable resource by numerical method in Linfen Basin of Shanxi,North China

Calculation of the groundwater recoverable resource is the main part of groundwater resource evaluation. The three-dimensional groundwater flow model in Linfen Basin was established by GMS software. Then the numerical model was calibrated by observed groundwater level from February to December in 2 000. Based on the calibrated model, the groundwater recoverable resource is calculated. The simulation result shows that under the given value of the groundwater recoverable resource, the groundwater level would decrease significantly in the first 1 000 days, while the water level would drop slowly in 1 000 to 2 000 days, and the water level change tend to be stable after 2000 days.