Multi-component seismic exploration technology, combining reflected PP- and converted PS-waves, is an effective tool for solving complicated oil and gas exploration problems. The improvement of converted wave resoluti...Multi-component seismic exploration technology, combining reflected PP- and converted PS-waves, is an effective tool for solving complicated oil and gas exploration problems. The improvement of converted wave resolution is one of the key problems. The main factor affecting converted wave resolution is the absorption of seismic waves in overlying strata. In order to remove the effect of absorption on converted waves, inverse Q filtering is used to improve the resolution. In this paper, we present a method to estimate the S-wave Q values from prestack converted wave gathers. Furthermore, we extend a stable and effective poststack inverse Q filtering method to prestack data which uses wave field continuation along the ray path to compensate for attenuation in prestack common shot PP- and PS-waves. The results of theoretical modeling prove that the method of estimating the S-wave Q values has high precision. The results from synthetic and real data prove that the stable inverse Q filtering method can effectively improve the resolution of prestack PP- and PS-waves.展开更多
BACKGROUND Burkitt-like lymphoma with 11q aberration(BLL-11q)is a rare provisional lymphoma,and the majority of cases are usually diagnosed by excisional lymph node biopsy.Here we report a case of BLL-11q diagnosed by...BACKGROUND Burkitt-like lymphoma with 11q aberration(BLL-11q)is a rare provisional lymphoma,and the majority of cases are usually diagnosed by excisional lymph node biopsy.Here we report a case of BLL-11q diagnosed by needle biopsy of the liver in order to improve further understanding of the disease,reduce misdiagnosis,and identify treatment regimens.CASE SUMMARY The patient was a 67-year-old male.He complained of increased frequency of stools for more than one year,periumbilical pain and discomfort exceeding 3 mo.A computed tomography scan suggested an appendiceal malignant tumor with multiple metastases of the peritoneum,omentum,and liver.Needle biopsy of liver nodules showed that the tumor cells were of median size,the shape was consistent,a small number of tumor cells were large,the“starry sky”pattern was evident,and some tissue cells showed multiple apoptotic debris with coarse particles.Immunohistochemistry was positive for CD20,CD10,BCL6,and MYC.The Ki-67 proliferation index was more than 95%.Molecular biological detection indicated a lack of MYC,BCL2 and BCL6 gene rearrangement with 11q aberration.Therefore,the diagnosis was BLL-11q of the liver.After eight courses of chemotherapy,the abdominal and pelvic peritoneal masses and liver nodules had almost disappeared.The patient recovered well after a follow-up period of more than 13 mo.CONCLUSION BLL-11q is rare,but patients treated with standard chemotherapy for Burkitt lymphoma can have a good prognosis.Reducing the dose of chemotherapy or developing specific therapies to prevent overtreatment may be considered,but more case studies are needed.展开更多
Ah Q and Chi Pheo are two typical figures created by two writers, Lu Xun of China and Nam Cao of Vietnam Authors use the typical method to create the artistic image which has the distinct individuality and can reflect...Ah Q and Chi Pheo are two typical figures created by two writers, Lu Xun of China and Nam Cao of Vietnam Authors use the typical method to create the artistic image which has the distinct individuality and can reflect certain social essence. ＂Ah Q＂ and ＂Chi Pheo＂ though in different nationalities and different age （Ah Q in the modern history stage 1911, Chi Pheo in the modem history of stage 1941）, but both are in the historical stage of the Eastern feudal society. Therefore, it can be considered that Lu Xun and Nam Cao are contemporaries. Besides, these two writers are deeply interested in the subject matter of the underclass farmers, so there are differences between the two typical characters. It is not surprising that the characters of＂Ah Q＂ and ＂Chi Pheo＂ walk from the novel to the screen, from the big screen to every corner of the lives of the people of the two countries, let the past. Present and future people can not forget them. Through the method of portraying characters, readers can further understand Lu Xun and Nam Cao＇s creative art thoughts. The social environment and historical background behind the fate of the characters. This paper attempts to find out the similarities and differences of the writers in portraying the art of the characters. Creative resonance and display of literary exchanges between the two countries展开更多
针对5G新空口-车联网(New Radio-Vehicle to Everything,NR-V2X)场景下车对基础设施(Vehicle to Infrastructure,V2I)和车对车(Vehicle to Vehicle,V2V)共享上行通信链路的频谱资源分配问题,提出了一种联邦-多智能体深度Q网络(Federated...针对5G新空口-车联网(New Radio-Vehicle to Everything,NR-V2X)场景下车对基础设施(Vehicle to Infrastructure,V2I)和车对车(Vehicle to Vehicle,V2V)共享上行通信链路的频谱资源分配问题,提出了一种联邦-多智能体深度Q网络(Federated Learning-Multi-Agent Deep Q Network,FL-MADQN)算法.该分布式算法中,每个车辆用户作为一个智能体,根据获取的本地信道状态信息,以网络信道容量最佳为目标函数,采用DQN算法训练学习本地网络模型.采用联邦学习加快以及稳定各智能体网络模型训练的收敛速度,即将各智能体的本地模型上传至基站进行聚合形成全局模型,再将全局模型下发至各智能体更新本地模型.仿真结果表明:与传统分布式多智能体DQN算法相比,所提出的方案具有更快的模型收敛速度,并且当车辆用户数增大时仍然保证V2V链路的通信效率以及V2I链路的信道容量.展开更多
基金supported by the 863 Program(Grant No.2007AA06Z218)
文摘Multi-component seismic exploration technology, combining reflected PP- and converted PS-waves, is an effective tool for solving complicated oil and gas exploration problems. The improvement of converted wave resolution is one of the key problems. The main factor affecting converted wave resolution is the absorption of seismic waves in overlying strata. In order to remove the effect of absorption on converted waves, inverse Q filtering is used to improve the resolution. In this paper, we present a method to estimate the S-wave Q values from prestack converted wave gathers. Furthermore, we extend a stable and effective poststack inverse Q filtering method to prestack data which uses wave field continuation along the ray path to compensate for attenuation in prestack common shot PP- and PS-waves. The results of theoretical modeling prove that the method of estimating the S-wave Q values has high precision. The results from synthetic and real data prove that the stable inverse Q filtering method can effectively improve the resolution of prestack PP- and PS-waves.
文摘BACKGROUND Burkitt-like lymphoma with 11q aberration(BLL-11q)is a rare provisional lymphoma,and the majority of cases are usually diagnosed by excisional lymph node biopsy.Here we report a case of BLL-11q diagnosed by needle biopsy of the liver in order to improve further understanding of the disease,reduce misdiagnosis,and identify treatment regimens.CASE SUMMARY The patient was a 67-year-old male.He complained of increased frequency of stools for more than one year,periumbilical pain and discomfort exceeding 3 mo.A computed tomography scan suggested an appendiceal malignant tumor with multiple metastases of the peritoneum,omentum,and liver.Needle biopsy of liver nodules showed that the tumor cells were of median size,the shape was consistent,a small number of tumor cells were large,the“starry sky”pattern was evident,and some tissue cells showed multiple apoptotic debris with coarse particles.Immunohistochemistry was positive for CD20,CD10,BCL6,and MYC.The Ki-67 proliferation index was more than 95%.Molecular biological detection indicated a lack of MYC,BCL2 and BCL6 gene rearrangement with 11q aberration.Therefore,the diagnosis was BLL-11q of the liver.After eight courses of chemotherapy,the abdominal and pelvic peritoneal masses and liver nodules had almost disappeared.The patient recovered well after a follow-up period of more than 13 mo.CONCLUSION BLL-11q is rare,but patients treated with standard chemotherapy for Burkitt lymphoma can have a good prognosis.Reducing the dose of chemotherapy or developing specific therapies to prevent overtreatment may be considered,but more case studies are needed.
文摘Ah Q and Chi Pheo are two typical figures created by two writers, Lu Xun of China and Nam Cao of Vietnam Authors use the typical method to create the artistic image which has the distinct individuality and can reflect certain social essence. ＂Ah Q＂ and ＂Chi Pheo＂ though in different nationalities and different age （Ah Q in the modern history stage 1911, Chi Pheo in the modem history of stage 1941）, but both are in the historical stage of the Eastern feudal society. Therefore, it can be considered that Lu Xun and Nam Cao are contemporaries. Besides, these two writers are deeply interested in the subject matter of the underclass farmers, so there are differences between the two typical characters. It is not surprising that the characters of＂Ah Q＂ and ＂Chi Pheo＂ walk from the novel to the screen, from the big screen to every corner of the lives of the people of the two countries, let the past. Present and future people can not forget them. Through the method of portraying characters, readers can further understand Lu Xun and Nam Cao＇s creative art thoughts. The social environment and historical background behind the fate of the characters. This paper attempts to find out the similarities and differences of the writers in portraying the art of the characters. Creative resonance and display of literary exchanges between the two countries
文摘针对5G新空口-车联网(New Radio-Vehicle to Everything,NR-V2X)场景下车对基础设施(Vehicle to Infrastructure,V2I)和车对车(Vehicle to Vehicle,V2V)共享上行通信链路的频谱资源分配问题,提出了一种联邦-多智能体深度Q网络(Federated Learning-Multi-Agent Deep Q Network,FL-MADQN)算法.该分布式算法中,每个车辆用户作为一个智能体,根据获取的本地信道状态信息,以网络信道容量最佳为目标函数,采用DQN算法训练学习本地网络模型.采用联邦学习加快以及稳定各智能体网络模型训练的收敛速度,即将各智能体的本地模型上传至基站进行聚合形成全局模型,再将全局模型下发至各智能体更新本地模型.仿真结果表明:与传统分布式多智能体DQN算法相比,所提出的方案具有更快的模型收敛速度,并且当车辆用户数增大时仍然保证V2V链路的通信效率以及V2I链路的信道容量.
