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| 1 | Numerical Investigation of Pressure Distribution in a Low Specific Speed Centrifugal Pump显示文摘To study the pressure distribution of the volute casing, front casing and back casing in a prototype centrifugal pump, the pressure experiments and numerical simulations are carried out at six working conditions in this paper. The experimental results shows that the asymmetry of static pressure distribution on volute casing and front cavity is caused by the tongue of the volute and it may result in high radial and axial resultant force which can cause vibration and noise in the centrifugal pump. With the increasing of flow rate, the asymmetry of static pressure distribution and the magnitude of static pressure values reduce. The numerical results indicate that the pressure fluctuation near the tongue is strongest and it becomes slighter at point away from the tongue. With the increasing of flow rate, the local high-pressure region in impeller passage reduces and the flow becomes smoother accordingly, whereas the fluid speed becomes much higher which may cause further flow losses. The results predicted by numerical simulation are in coincident with the experimental ones. It shows that the turbulence model for simulating the flow field in centrifugal pumps is feasible. | JIA Xiaoqi CUI Baoling ZHU Zuchao YU Xiaoli | 2018 | Journal of Thermal Science2018，27，1： | 7 |
| 2 | Controlled growth and photoconductive properties of hexagonal SnS2 nanoflakes with mesa-shaped atomic steps显示文摘We demonstrated the controlled growth of two-dimensional (2D) hexagonal tin disulfide (SnS2) nanoflakes with stacked monolayer atomic steps. The morphology was similar to flat-topped and step-sided mesa plateaus or step pyramids. The SnS2 nanoflakes were grown on mica substrates via an atmospheric-pressure chemical vapor deposition process using tin monosulfide and sulfur powder as precursors. Atomic force microscopy (AFM), electron microscopy, and Raman characterizations were performed to investigate the structural features, and a sequential layer-wise epitaxial growth mechanism was revealed. In addition, systematic Raman characterizations were performed on individual SnS2 nanoflakes with a wide range of thicknesses (1-100 nm), indicating that the A1g peak intensity and Raman shifts were closely related to the thickness of the SnS2 nanoflakes. Moreover, photoconductive AFM was performed on the monolayer-stepped SnS2 nanoflakes, revealing that the flat surface and the edges of the SnS2 atomic steps had different electrical conductive properties and photoconductive behaviors. This is ascribed to the dangling bonds and defects at the atomic step edges, which caused a height difference of the Schottky barriers formed at the interfaces between the PtIr-coated AFM tip and the step edges or the flat surface of the SnS2 nanoflakes. The 2D SnS2 crystals with regular monolayer atomic steps and fast photoresponsivity are promising for novel applications in photodetectors and integrated optoelectronic circuits. | Yi Hu Tao Chen Xiaoqi Wang Lianbo Ma Renpeng Chen Hongfei Zhu Xin Yuan Changzeng Yan Guoyin Zhu Hongling Lv Jia Liang Zhong Jin Jie Liu | 2017 | Nano Research2017，10，4： | 5 |
| 3 | Precipitation transformation of rare earth sulfate into chloride with p-dodecylphenoxy carboxylic acids显示文摘Methods for transforming rare earth(RE)sulfate into chloride mainly include extraction process with organophosphonic mono-acids or aliphatic acids and precipitation process with ammonium bicarbonate(NH4 HCO3).In this paper,alkylphenoxy carboxylic acids(HAs)ofp-dodecylphenoxy acetic acid(HA-Ⅰ),pdodecylphenoxypropanoic acid(HA-Ⅱ)and p-dodecylphenoxybutyric acid(HA-Ⅲ),which were liquid at room temperature were synthesized and characterized.The precipitation mechanisms of RE elements with the HAs were investigated and the HA/RE molar ratios of the solid complexes were determined as3:1 by equi-molar series method which accord with the principle of charge balance.Applicability of HAs for the transformation of RE sulfate from concentrated sulfuric acid roasted RE concentrate into chloride via precipitation method was discussed.100%HA-Ⅱwas selected as the liquid organic precipitant without dilution of volatile solvent soracceleration of phase separation by phase-modifiers.The RE sulfate solution can be precipitated by HA-Ⅱafter neutralization with liquid NaOH and stripped with concentrated HCl at room temperature.High concentration of RE chloride of 218.1 g/L with low residue of sulfate radical of 0.536 g/L was obtained.The residual organic precipitant in the raffinate solution was tested to be lower than 8 mg/L at 25℃and the chemical oxygen demand(COD)in wastewater was less than 50 mg/L. | Yanliang Wang Jia Su Xiangguang Guo Jianguo Cui Yan Bai Fujian Li Xiaoqi Sun | 2019 | Journal of Rare Earths2019，37，12： | 5 |
| 4 | Preliminary calibration results of the HY-2B altimeter’s SSH at China’s Wanshan calibration site显示文摘Satellite altimeter needs to be calibrated to evaluate the accuracy of sea surface height data.The dedicated altimeter calibration field needs to establish a special calibration strategy and needs to evaluate its calibration ability.This paper describes absolute calibration of HY-2 B altimeter SSH using the GPS calibration method at the newly Wanshan calibration site,located in the Wanshan Islands,China.There are two HY-2 B altimeter passes across the Wanshan calibration site.Pass No.362 is descending and the ground track passes the east of Dan’gan Island.Pass No.375 is ascending and crosses the Zhiwan Island.The GPS data processing strategy of Wanshan calibration site was established and the accuracy of GPS calibration method of Wanshan calibration site was evaluated.Meanwhile,the processing strategies of the HY-2 B altimeter for the Wanshan calibration site were established,and a dedicated geoid model data were used to benefit the calibration accuracy.The time-averaged HY-2 B altimeter bias was approximately 2.12 cm with a standard deviation of 2.08 cm.The performance of the HY-2 B correction microwave radiometer was also evaluated in terms of the wet troposphere path delay and showed a mean difference-0.2 cm with a 1.4 cm standard deviation with respect to the in situ GPS radiosonde. | Chuntao Chen Jianhua Zhu Chaofei Ma Mingsen Lin Longhao Yan Xiaoqi Huang Wanlin Zhai Bo Mu Yongjun Jia | 2021 | Acta Oceanologica Sinica2021，40，5： | 2 |
| 5 | Recovery of thorium and rare earths from leachate of ion-absorbed rare earth radioactive residues with N1923 and Cyanex■572显示文摘Ion-absorbed rare earth ores radioactive residues(IREORR)are a class of waste residue from the production of rare earth elements(REEs).Because of its radioactive dose,IREORR are usually stored in waste warehouses.IREORR are difficult to be disposed of.However,it contains relatively high concentrations of REEs,which can be considered as a valuable secondary resource.In this paper,a novel process is developed for the separation of thorium(Th)and recovery of REEs from IREORR hydrochloric acid leachate with primary amine N1923 and Cyanex?572,respectively.The effects of sulfate concentration,extractant concentration and pH on N1923 extraction in hydrochloric acid solution were investigated in detail.The results show that the extraction capacity of N1923 can be improved by adding sulfate to the solution and increasing the concentration of N1923.Acidity has little effect on the extraction of Th when pH is higher than 1.As for the stripping,REEs are more easily stripped from loaded organic phase than Th,and nitric acid is a better stripping agent than hydrochloric acid.Combined with the extraction of Cyanex■572 for REEs,a fractional extraction experiment for separating Th and enriching of REEs was performed.The yield of Th is higher than 99.9%and the concentration of REEs is enriched to 183.84 g/L. | Jia Su Xiangguang Guo Yun Gao Shan Wu Ruigao Xu Xiaoqi Sun | 2021 | Journal of Rare Earths2021，39，10： | 2 |
| 6 | The first extra-large helium-rich gas field identified in a tight sandstone of the Dongsheng Gas Field,Ordos Basin,China显示文摘Helium gas is a scarce but important strategic resource,which is usually associated with natural gas.Presently,only one extra-large helium-rich gas field has been found in China:the Hetianhe Gas Field in the Tarim Basin.This paper reports a new example,the Dongsheng Gas Field(DGF)in the Ordos Basin.In this study,92 natural gas samples from the DGF were analyzed for helium content and isotope composition using isotope mass spectrometry.The natural gas samples were found to have an average helium content of 0.133%,with 65(70.7%)of the samples having a helium content of 0.1%or more.Based on the proven natural gas reserves of the DGF,the proven geological helium reserves were calculated to be 1.96×10^(8)m^(3),suggesting that it represents the first extra-large helium-rich natural gas reservoir to be hosted in tight sandstone in China.The ^(3)He/^(4)He ratios of 5 natural gas samples from the DGF are within the range of 3.03×10^(−8)–3.44×10^(−8).Therefore,the helium in the gas field is thought to be of typical crustal origin and to have formed in the granitic basement that is rich in uranium and thorium.The accumulation of helium-rich natural gas was controlled by regional tectonic activities.Activity along the fault connecting the reservoir with the basement caused release of the helium gas,which entered the overlying strata along the fault and accumulated with conventional hydrocarbon gas.Based on the structural background and the distribution of helium source rocks in the Ordos Basin,the main helium source rocks with high exploration potential are located in deep strata within the north and middle parts of the basin. | Weilong PENG Quanyou LIU Ying ZHANG Huichong JIA Dongya ZHU Qingqiang MENG Xiaoqi WU Shang DENG Yongsheng MA | 2022 | Science China Earth Sciences2022，65，5： | 2 |
| 7 | α-Lipoic Acid Exerts Its Antiviral Effect against Viral Hemorrhagic Septicemia Virus(VHSV) by Promoting Upregulation of Antiviral Genes and Suppressing VHSV-Induced Oxidative Stress显示文摘Viral hemorrhagic septicemia virus(VHSV), belonging to the genus Novirhabdovirus, Rhabdoviridae family, is a causative agent of high mortality in fish and has caused significant losses to the aquaculture industry. Currently, no effective vaccines, Food and Drug Administration-approved inhibitors, or other therapeutic intervention options are available against VHSV. α-Lipoic Acid(LA), a potent antioxidant, has been proposed to have antiviral effects against different viruses. In this study, LA(CC_(50)= 472.6 lmol/L) was repurposed to exhibit antiviral activity against VHSV. In fathead minnow cells,LA significantly increased the cell viability post-VHSV infection(EC_(50)= 42.7 lmol/L), and exerted a dose-dependent inhibitory effect on VHSV induced-plaque, cytopathic effects, and VHSV glycoprotein expression. The time-of-addition assay suggested that the antiviral activity of LA occurred at viral replication stage. Survival assay revealed that LA could significantly upregulated the survival rate of VHSV-infected largemouth bass in both co-injection(38.095% vs. 1.887%,P < 0.01) and post-injection manner(38.813% vs. 8.696%, P < 0.01) compared with the control group. Additional comparative transcriptome and q RT-PCR analysis revealed LA treatment upregulated the expression of several antiviral genes, such as IRF7, Viperin, and ISG15. Moreover, LA treatment reduced VHSV-induced reactive oxygen species production in addition to Nrf2 and SOD1 expression. Taken together, these data demonstrated that LA suppressed VHSV replication by inducing antiviral genes expression and reducing VHSV-induced oxidative stress. These results suggest a new direction in the development of potential antiviral candidate drugs against VHSV infection. | Wanwan Zhang Xiaoqi Chen Fangzhao Yu Fengquan Li Wangdong Li Meisheng Yi Kuntong Jia | 2021 | Virologica Sinica2021，36，6： | 2 |
| 8 | Indirect energy flow between industrial sectors in China: A complex network approach显示文摘 | Xiaoqi Sun Haizhong An Xiangyun Gao Xiaoliang Jia Xiaojia Liu | 2016 | Energy2016，，： | 1 |
| 9 | A multi-focus image fusion algorithm based on an improved dual-channel PCNN in NSCT domain显示文摘 | Zhang Baohua Lu Xiaoqi Jia Weitao | 2013 | Optik2013，124，20： | 1 |
| 10 | High-Field Magnetic Resonance Imaging of Suicidality in Patients With Major Depressive Disorder显示文摘 | Jia Zhiyun Huang Xiaoqi Wu Qizhu Zhang Tijiang Lui Su Zhang Junran Amatya Nabin Kuang Weihong Chan Raymond C K Kemp Graham J Mechelli Andrea Gong Qiyong | 2010 | The American Journal of Psychiatry2010，，： | 1 |
| 11 | Study on Internal flow and external performance of a semi-open impeller centrifugal pump with different tip clearances显示文摘 | Jia Xiaoqi Cui Baoling Zhang Yuliang | 2014 | International Journal of Turbo & Jet-Engines2014，，5： | 1 |
| 12 | Genome-wide association studies reveal QTL hotspots for grain brightness and black point traits in barley显示文摘Grain kernel discoloration(KD)in cereal crops leads to down-grading grain quality and substantial economic losses worldwide.Breeding KD tolerant varieties requires a clear understanding of the genetic basis underlying this trait.Here,we generated a high-density single nucleotide polymorphisms(SNPs)map for a diverse barley germplasm and collected trait data from two independent field trials for five KD related traits:grain brightness(TL),redness(Ta),yellowness(Tb),black point impact(Tbpi),and total black point in percentage(Tbpt).Although grain brightness and black point is genetically correlated,the grain brightness traits(TL,Ta,and Tb)have significantly higher heritability than that of the black point traits(Tbpt and Tbpi),suggesting black point traits may be more susceptible to environmental influence.Using genome-wide association studies(GWAS),we identified a total of 37 quantitative trait loci(QTL),including two major QTL hotspots on chromosomes 4H and 7H,respectively.The two QTL hotspots are associated with all five KD traits.Further genetic linkage and gene transcription analyses identified candidate genes for the grain KD,including several genes in the flavonoid pathway and plant peroxidase.Our study provides valuable insights into the genetic basis for the grain KD in barley and would greatly facilitate future breeding programs for improving grain KD resistance. | Yong Jia Sharon Westcott Tianhua He Lee Anne McFawn Tefera Angessa Camila Hill Cong Tan Xiaoqi Zhang Gaofeng Zhou Chengdao Li | 2021 | The Crop Journal2021，9，1： | 1 |
| 13 | High-Field Magnetic Resonance Imaging of Suicidality in Patients With Major Depressive Disorder 显示文摘 | Zhiyun Jia Xiaoqi Huang Qizhu Wu | 2010 | American Journal of Psychiatry2010，167，： | 1 |
| 14 | Carboxymethylation of the polysaccharide from the fermentation broth of Marasmius androsaceus and its antidepressant mechanisms显示文摘To investigate the structure-activity relationship of polysaccharide and obtain a better antidepressant polysaccharide,the antidepressant-like activity of a carboxymethyl polysaccharide(C-MEPS2)subjected to submerged fermentation was systematically studied.PC12-H cell and Kunming mice were used to investigate the differences and their mechanism in the antidepressant effects of C-MEPS2 and MEPS2.Cell experiments have showed that C-MEPS2 has a better antidepressant effect than MEPS2.C-MEPS2 could exert antidepressant effects related to catecholamine synthesis with specifi c sites of TH,D2DR,and P-CAMKII.In addition,C-MEPS2 could repair the Res-induced damage in PC12-H cell,stabilize the mitochondrial membrane potential and regulate intracellular Ca^(2+) concentration,thus reducing cell apoptosis caused by RES.Antagonists common dosing experiments on animals further proved that CMEPS2 could signifi cantly improve the antidepressant effect of derivatives without affecting the antidepressant mechanism of MEPS2.It is speculated that it may be related to carboxymethylated modifi cation. | Yu Qiu Yan Su Jia Song Fangming Mou Jia Gou Xiaoqi Geng Xinyue Li Zhiqiang Nie Jianxin Wang Yu Zheng Min Wang | 2023 | Food Science and Human Wellness2023，12，6： | 0 |
| 15 | A Concurrent Security Monitoring Method for Virtualization Environments显示文摘Recently,virtualization technologies have been widely used in industry.In order to monitor the security of target systems in virtualization environments,conventional methods usually put the security monitoring mechanism into the normal functionality of the target systems.However,these methods are either prone to be tempered by attackers or introduce considerable performance overhead for target systems.To address these problems,in this paper,we present a concurrent security monitoring method which decouples traditional serial mechanisms,including security event collector and analyzer,into two concurrent components.On one hand,we utilize the SIM framework to deploy the event collector into the target virtual machine.On the other hand,we combine the virtualization technology and multi-core technology to put the event analyzer into a trusted execution environment.To address the synchronization problem between these two concurrent components,we make use of Lamport's ring buffer algorithm.Based on the Xen hypervisor,we have implemented a prototype system named COMO.The experimental results show that COMO can monitor the security of the target virtual machine concurrently within a little performance overhead. | TIAN Donghai JIA Xiaoqi CHEN Junhua HU Changzhen | 2016 | China Communications2016，13，1： | 0 |
| 16 | Direct contact moxibustion promotes apoptosis of gastric cancer cells in rats by regulating intestinal flora显示文摘OBJECTIVE:To examine whether direct contact moxibustion(DCM)can prevent and treat gastric cancer(GC)by regulating intestinal flora in rats.METHODS:Male Wistar rats were randomly divided into normal group,normal+DCM control group,model group,and model+DCM group.Gastric cancer rats were induced by N-methyl-N-nitro-N-nitrosoguanidine(MNNG,20 mg/mL)by gavage.At the same time,the model rats and normal rats were given DCM at Zusanli(ST36),Weishu(BL21),and Zhongwan(CV12)for 16 weeks.After treatment,gastric tissues were collected to analyze the pathological changes and the apoptosis of gastric mucosa cells.In addition,the cecal stool was taken and analyzed by 16 s r RNA sequencing.RESULTS:Gastric cancer-like pathological changes and different abundance of the intestinal flora were found in the model group.DCM promoted mucosa tissue apoptosis and regulated the abnormal changes of the intestinal microflora caused by MNNG;DCM also inhibited the growth of Ruminococcaceae and Prevotellaceae flora and promoted the growth of probiotic Akkermansia.Furthermore,DCM made the composition and abundance of intestinal microflora in the GC rats tending to the normal rats.CONCLUSION:DCM stimulating Zusanli(ST36),Weishu(BL21),and Zhongwan(CV12)promoted the apoptosis of gastric mucosa and delayed the progression of gastric cancer,possibly by decreasing Ruminococcaceae and Prevotellaceae bacteria(bacteria that produce short-chain fatty acids in the intestine)and promoting the growth of probiotic Akkermansia. | PAN Lijia MA Shuya WEN Jing ZHANG Xiaoqi XING Haijiao JIA Chunsheng | 2021 | Journal of Traditional Chinese Medicine2021，41，6： | 0 |
| 17 | A Practical Online Approach to Protecting Kernel Heap Buffers in Kernel Modules显示文摘Heap overflow attack is one of the major memory corruption attacks that have become prevalent for decades. To defeat this attack,many protection methods are proposed in recent years. However,most of these existing methods focus on user-level heap overflow detection. Only a few methods are proposed for kernel heap protection. Moreover,all these kernel protection methods need modifying the existing OS kernel so that they may not be adopted in practice. To address this problem,we propose a lightweight virtualization-based solution that can protect the kernel heap buffers allocated for the target kernel modules. The key idea of our approach is to combine the static binary analysis and virtualization technology to trap a memory allocation operation of the target kernel module,and then add one secure canary word to the end of the allocated buffer. After that,a monitor process is launched to check the integrity of the canaries. The evaluations show that our system can detect kernel heap overflow attacks effectively with minimal performance cost. | Donghai Tian Xiaoqi Jia Junhua Chen Changzhen Hu Jingfeng Xue | 2016 | China Communications2016，13，11： | 0 |
| 18 | Security-first architecture:deploying physically isolated active security processors for safeguarding the future of computing显示文摘It is fundamentally challenging to build a secure system atop the current computer architecture.The complexity in software,hardware and ASIC manufacture has reached beyond the capability of existing verification methodologies.Without whole-system verification,current systems have no proven security.It is observed that current systems are exposed to a variety of attacks due to the existence of a large number of exploitable security vulnerabilities.Some vulnerabilities are difficult to remove without significant performance impact because performance and security can be conflicting with each other.Even worse,attacks are constantly evolving,and sophisticated attacks are now capable of systematically exploiting multiple vulnerabilities while remain hidden from detection.Eagering to achieve security hardening of current computer architecture,existing defenses are mostly ad hoc and passive in nature.They are normally developed in responding to specific attacks spontaneously after specific vulnerabilities were discovered.As a result,they are not yet systematic in protecting systems from existing attacks and likely defenseless in front of zero-day attacks.To confront the aforementioned challenges,this paper proposes Security-first Architecture,a concept which enforces systematic and active defenses using Active Security Processors.In systems built based on this concept,traditional processors(i.e.,Computation Processors)are monitored and protected by Active Security Processors.The two types of processors execute on their own physically-isolated resources,including memory,disks,network and I/O devices.The Active Security Processors are provided with dedicated channels to access all the resources of the Computation Processors but not vice versa.This allows the Active Security Processors to actively detect and tackle malicious activities in the Computation Processors with minimum performance degradation while protecting themselves from the attacks launched from the Computation Processors thanks to the resource isolation. | Dan Meng Rui Hou Gang Shi Bibo Tu Aimin Yu Ziyuan Zhu Xiaoqi Jia Peng Liu | 2018 | Cybersecurity2018，1，1： | 0 |
| 19 | SHFuzz:A Hybrid Fuzzing Method Assisted by Static Analysis for Binary Programs显示文摘Fuzzing is an effective technique to find security bugs in programs by quickly exploring the input space of programs.To further discover vulnerabilities hidden in deep execution paths,the hybrid fuzzing combines fuzzing and concolic execution for going through complex branch conditions.In general,we observe that the execution path which comes across more and complex basic blocks may have a higher chance of containing a security bug.Based on this observation,we propose a hybrid fuzzing method assisted by static analysis for binary programs.The basic idea of our method is to prioritize seed inputs according to the complexity of their associated execution paths.For this purpose,we utilize static analysis to evaluate the complexity of each basic block and employ the hardware trace mechanism to dynamically extract the execution path for calculating the seed inputs’weights.The key advantage of our method is that our system can test binary programs efficiently by using the hardware trace and hybrid fuzzing.To evaluate the effectiveness of our method,we design and implement a prototype system,namely SHFuzz.The evaluation results show SHFuzz discovers more unique crashes on several real-world applications and the LAVA-M dataset when compared to the previous solutions. | Wenjie Wang Donghai Tian Rui Ma Hang Wei Qianjin Ying Xiaoqi Jia Lei Zuo | 2021 | China Communications2021，18，8： | 0 |
| 20 | Experimental Analysis of Radial Centrifugal Pump Shutdown显示文摘Centrifugal pumps are widely used in the metallurgy,coal,and building sectors.In order to study the hydraulic characteristics of a closed impeller centrifugal pump during its shutdown in the so-called power frequency and frequency conversion modes,experiments were carried to determine the characteristic evolution of parameters such as speed,inlet and outlet pressure,head,flow rate and shaft power.A quasi-steady-state method was also used to further investigate these transient behaviors.The results show that,compared to the power frequency input,the performance parameter curves for the frequency conversion input are less volatile and smoother.The characteristic time is longer and the response to shutdown is slower.The quasi-steady-state theoretical head-flow curves match the experimental head-flow curves more closely at low flow rates when the frequency conversion input is considered.Moreover,in this case,the similarity law predicts the hydraulic performance more accurately. | Xiao Sun Jiangbo Tong Yuliang Zhang Haibing Cai Wen Zhou Xiaoqi Jia Litao Ou | 2024 | Fluid Dynamics & Materials Processing2024，20，4： | 0 |
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