Probing Phonon dynamics and Electron-Phonon Coupling by High Harmonic Generation in Solids

Acting as a highly nonlinear response to the strong laser field, high harmonic generation (HHG) naturally contains the fingerprints of atomic and electronic properties of materials. Electronic properties of a solid such as band structure and topology can thus be probed, while the phonon dynamics during HHG are often neglected. Here we show that by exploiting the effects of phonon deformation on HHG, the intrinsic phonon information can be deciphered and direct probing of band- and mode-resolved electron-phonon couplings (EPC) of photoexcited materials is possible. Considering HHG spectroscopy can be vacuum free and unrestricted to electron occupation, this work suggests HHG is promising for all-optical characterization of EPC in solids, especially for gapped quantum states or materials under high pressure

A data analysis method for isochronous mass spectrometry using two time-of-flight detectors at CSRe

The concept of isochronous mass spectrometry (IMS) applying two time-of-flight (TOF) detectors originated many years ago at GSI. However, the corresponding method for data analysis has never been discussed in detail. Recently, two TOF detectors have been installed at CSRe and the new working mode of the ring is under test. In this paper, a data analysis method for this mode is introduced and tested with a series of simulations. The results show that the new IMS method can significantly improve mass resolving power via the additional velocity information of stored ions. This improvement is especially important for nuclides with Lorentz factor $\gamma$-value far away from the transition point $\gamma _t$ of the storage ring CSRe.Comment: published in Chinese Physics C Vol. 39, No. 10 (2015) 10620

A saúde mental é o fator mais importante que influencia a qualidade de vida de idosos deixados para trás quando as famílias emigram da China rural

OBJECTIVES: to investigate the quality of life and the associated factors on left behind elderly in rural China. METHOD: the research was conducted cluster sampling to select 456 elderly left behind when family members migrated out of rural China to participate in a cross-sectional study by completing a general data questionnaire and Quality of Life questionnaire. RESULTS: 91.5% of the elderly requested psychological counseling and education. For the elderly, scores for mental health (39.56±13.73) were significantly lower compared with Chinese standard data (61.6±13.7) (POBJETIVOS: investigar la calidad de vida y los factores asociados a los adultos mayores que se quedan en las zonas rurales de China. MÉTODO: la investigación se realizó por medio de muestreo por conglomerados para seleccionar 456 adultos mayores que se quedaron cuando los miembros de la familia emigraron de zonas rurales de China, para participar en un estudio de corte transversal, completando un cuestionario de datos generales y cuestionario de calidad de vida. RESULTADOS: el 91.5% de los adultos mayores solicitó asistencia psicológica y educación. Para los adultos mayores, las puntuaciones de salud mental (39.56±13.73) fueron significativamente más bajos en comparación con los datos estándar de China (61.6±13.7) (pOBJETIVOS: investigar a qualidade de vida e fatores associados de idosos deixados para trás na China rural. MÉTODO: foi realizada amostragem por conglomerado para selecionar 456 idosos deixados para trás quando os membros da família emigram da China rural. Este é um estudo transversal com preenchimento de um questionário de dados gerais e de qualidade de vida. RESULTADOS: 91,5% dos idosos convidados solicitaram aconselhamento e educação psicológicos. Para os idosos, os escores de saúde mental (39,56±13,73) foram significativamente menores em comparação aos dados padrões chineses (61,6±13,7) (

Quantum LiDAR with Frequency Modulated Continuous Wave

The range and speed of a moving object can be ascertained using the sensing technique known as light detection and ranging (LiDAR). It has recently been suggested that quantum LiDAR, which uses entangled states of light, can enhance the capabilities of LiDAR. Entangled pulsed light is used in prior quantum LiDAR approaches to assess both range and velocity at the same time using the pulses' time of flight and Doppler shift. The entangled pulsed light generation and detection, which are crucial for pulsed quantum LiDAR, are often inefficient. Here, we study a quantum LiDAR that operates on a frequency-modulated continuous wave (FMCW), as opposed to pulses. We first outline the design of the quantum FMCW LiDAR using entangled frequency-modulated photons in a Mach-Zehnder interferometer, and we demonstrate how it can increase accuracy and resolution for range and velocity measurements by $\sqrt{n}$ and $n$, respectively, with $n$ entangled photons. We also demonstrate that quantum FMCW LiDAR may perform simultaneous measurements of the range and velocity without the need for quantum pulsed compression, which is necessary in pulsed quantum LiDAR. Since the generation of entangled photons is the only inefficient nonlinear optical process needed, the quantum FMCW LiDAR is better suited for practical implementations. Additionally, most measurements in the quantum FMCW LiDAR can be carried out electronically by down-converting optical signal to microwave region

Recurrent Upper Quadrant Pain: A Fish Bone Secondary to Gastric Perforation and Liver Abscess

A 60-year-old male patient was admitted to our hospital for recurrent upper quadrant pain for 1 month. He had a past history of coronary artery disease. After admission, he repeatedly suffered from high-grade fever, chills and upper quadrant pain. Computed tomography (CT) showed a round hypodense mass in the left lobe of the liver, approximately 2.7 × 2.2 cm in size, and a fish bone was confirmed by surgery in the left lobe of liver. The patient was cured completely after surgical removal of the fish bone and liver abscess. CT scan 1 month after discharge showed that the liver abscess had disappeared completely

Clinical analysis of 1 case of solitary brain metastases misdiagnosed as cerebral infarction

目的  通过报告1例误诊为脑梗死的单发性脑转移瘤患者的诊断过程，总结单发性脑转移瘤的临床、影像学特征及诊断治疗方法。方法  回顾性分析1例单发性脑转移瘤患者的诊断过程，并复习有关文献。结果  脑转移瘤常多发，单发者仅占25%，发病年龄以40～60岁多见，原发病灶以肺最常见。脑转移瘤常位于脑叶灰白质交界处，不同部位的肿瘤可出现不同的临床表现，影像学上常表现为“小病灶、大水肿”，与颅内原发肿瘤不易区分，头颅CT或 MRI增强检查并查到其他部位的原发肿瘤病灶后可确定诊断。目前主张单发性脑转移瘤应进行手术切除，术后辅以立体定向放射治疗和全脑放射治疗。结论  15%的脑转移瘤患者既往无肿瘤病史，因此诊断脑瘤后须在身体其他部位查找有无原发病灶，避免误诊、漏诊。对于中老年肺癌或其他恶性肿瘤患者，无论有无中枢神经系统症状，均应积极进行头颅CT甚至MRI检查，以发现较小的早期脑转移瘤病灶。对于易患肺癌人群，应该每年体检，进行胸部X线检查或低剂量CT筛查，以便早期发现肺癌病灶，早期治疗，防止肿瘤转移。Objective: To report 1 case was misdiagnosed as cerebral infarction solitary brain metastases (SBM) in patients with diagnosis process, and to summarize the clinical and imaging features of the SBM and its treatment. Methods: To retrospectively analyze the diagnostic process of 1 case of SBM patients, and to have literature review. Results: Patients with solitary and multiple brain metastases accounted for only 25%, the onset age was 40 ~ 60 years old, and the most common primary lesion is in lung. Brain metastases are often on the border, in between lobes grey matter. Different parts of the tumors can present different clinical manifestations. The diagnostic imaging is often shown as "small lesions, large edema", and intracranial primary tumor is not easy to distinguish, Head CT or MRI examination of tumors in other parts could confirm the diagnosis. Now that SBM should undergo surgery resection, postoperative supplemented by stereotactic radiotherapy and whole brain radiotherapy. Conclusions: 15% of the patients with brain metastases haven’t got previous medical history, the doctor is therefore must look for presence of primary lesions in other parts of the body for accurate diagnosis, to avoid the misdiagnosis and missed diagnosis. Middle-aged and elderly patients with lung cancer or other malignant tumor, regardless of the presence of the central nervous system symptoms, should carry on the head CT or MRI examination, and find smaller early brain metastatic lesions. People who are susceptible to lung cancer should have annual physical examination, chest X-ray or low dose CT screening for early detection of lung cancer lesions, early treatment and prevention of tumor metastasi